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linux/drivers/char/stallion.c

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/*****************************************************************************/
/*
* stallion.c -- stallion multiport serial driver.
*
* Copyright (C) 1996-1999 Stallion Technologies
* Copyright (C) 1994-1996 Greg Ungerer.
*
* This code is loosely based on the Linux serial driver, written by
* Linus Torvalds, Theodore T'so and others.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*****************************************************************************/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/cd1400.h>
#include <linux/sc26198.h>
#include <linux/comstats.h>
#include <linux/stallion.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#ifdef CONFIG_PCI
#include <linux/pci.h>
#endif
/*****************************************************************************/
/*
* Define different board types. Use the standard Stallion "assigned"
* board numbers. Boards supported in this driver are abbreviated as
* EIO = EasyIO and ECH = EasyConnection 8/32.
*/
#define BRD_EASYIO 20
#define BRD_ECH 21
#define BRD_ECHMC 22
#define BRD_ECHPCI 26
#define BRD_ECH64PCI 27
#define BRD_EASYIOPCI 28
/*
* Define a configuration structure to hold the board configuration.
* Need to set this up in the code (for now) with the boards that are
* to be configured into the system. This is what needs to be modified
* when adding/removing/modifying boards. Each line entry in the
* stl_brdconf[] array is a board. Each line contains io/irq/memory
* ranges for that board (as well as what type of board it is).
* Some examples:
* { BRD_EASYIO, 0x2a0, 0, 0, 10, 0 },
* This line would configure an EasyIO board (4 or 8, no difference),
* at io address 2a0 and irq 10.
* Another example:
* { BRD_ECH, 0x2a8, 0x280, 0, 12, 0 },
* This line will configure an EasyConnection 8/32 board at primary io
* address 2a8, secondary io address 280 and irq 12.
* Enter as many lines into this array as you want (only the first 4
* will actually be used!). Any combination of EasyIO and EasyConnection
* boards can be specified. EasyConnection 8/32 boards can share their
* secondary io addresses between each other.
*
* NOTE: there is no need to put any entries in this table for PCI
* boards. They will be found automatically by the driver - provided
* PCI BIOS32 support is compiled into the kernel.
*/
typedef struct {
int brdtype;
int ioaddr1;
int ioaddr2;
unsigned long memaddr;
int irq;
int irqtype;
} stlconf_t;
static stlconf_t stl_brdconf[] = {
/*{ BRD_EASYIO, 0x2a0, 0, 0, 10, 0 },*/
};
static int stl_nrbrds = ARRAY_SIZE(stl_brdconf);
/*****************************************************************************/
/*
* Define some important driver characteristics. Device major numbers
* allocated as per Linux Device Registry.
*/
#ifndef STL_SIOMEMMAJOR
#define STL_SIOMEMMAJOR 28
#endif
#ifndef STL_SERIALMAJOR
#define STL_SERIALMAJOR 24
#endif
#ifndef STL_CALLOUTMAJOR
#define STL_CALLOUTMAJOR 25
#endif
/*
* Set the TX buffer size. Bigger is better, but we don't want
* to chew too much memory with buffers!
*/
#define STL_TXBUFLOW 512
#define STL_TXBUFSIZE 4096
/*****************************************************************************/
/*
* Define our local driver identity first. Set up stuff to deal with
* all the local structures required by a serial tty driver.
*/
static char *stl_drvtitle = "Stallion Multiport Serial Driver";
static char *stl_drvname = "stallion";
static char *stl_drvversion = "5.6.0";
static struct tty_driver *stl_serial;
/*
* Define a local default termios struct. All ports will be created
* with this termios initially. Basically all it defines is a raw port
* at 9600, 8 data bits, 1 stop bit.
*/
static struct termios stl_deftermios = {
.c_cflag = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
.c_cc = INIT_C_CC,
};
/*
* Define global stats structures. Not used often, and can be
* re-used for each stats call.
*/
static comstats_t stl_comstats;
static combrd_t stl_brdstats;
static stlbrd_t stl_dummybrd;
static stlport_t stl_dummyport;
/*
* Define global place to put buffer overflow characters.
*/
static char stl_unwanted[SC26198_RXFIFOSIZE];
/*****************************************************************************/
static stlbrd_t *stl_brds[STL_MAXBRDS];
/*
* Per board state flags. Used with the state field of the board struct.
* Not really much here!
*/
#define BRD_FOUND 0x1
/*
* Define the port structure istate flags. These set of flags are
* modified at interrupt time - so setting and reseting them needs
* to be atomic. Use the bit clear/setting routines for this.
*/
#define ASYI_TXBUSY 1
#define ASYI_TXLOW 2
#define ASYI_DCDCHANGE 3
#define ASYI_TXFLOWED 4
/*
* Define an array of board names as printable strings. Handy for
* referencing boards when printing trace and stuff.
*/
static char *stl_brdnames[] = {
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
(char *) NULL,
"EasyIO",
"EC8/32-AT",
"EC8/32-MC",
(char *) NULL,
(char *) NULL,
(char *) NULL,
"EC8/32-PCI",
"EC8/64-PCI",
"EasyIO-PCI",
};
/*****************************************************************************/
/*
* Define some string labels for arguments passed from the module
* load line. These allow for easy board definitions, and easy
* modification of the io, memory and irq resoucres.
*/
static int stl_nargs = 0;
static char *board0[4];
static char *board1[4];
static char *board2[4];
static char *board3[4];
static char **stl_brdsp[] = {
(char **) &board0,
(char **) &board1,
(char **) &board2,
(char **) &board3
};
/*
* Define a set of common board names, and types. This is used to
* parse any module arguments.
*/
typedef struct stlbrdtype {
char *name;
int type;
} stlbrdtype_t;
static stlbrdtype_t stl_brdstr[] = {
{ "easyio", BRD_EASYIO },
{ "eio", BRD_EASYIO },
{ "20", BRD_EASYIO },
{ "ec8/32", BRD_ECH },
{ "ec8/32-at", BRD_ECH },
{ "ec8/32-isa", BRD_ECH },
{ "ech", BRD_ECH },
{ "echat", BRD_ECH },
{ "21", BRD_ECH },
{ "ec8/32-mc", BRD_ECHMC },
{ "ec8/32-mca", BRD_ECHMC },
{ "echmc", BRD_ECHMC },
{ "echmca", BRD_ECHMC },
{ "22", BRD_ECHMC },
{ "ec8/32-pc", BRD_ECHPCI },
{ "ec8/32-pci", BRD_ECHPCI },
{ "26", BRD_ECHPCI },
{ "ec8/64-pc", BRD_ECH64PCI },
{ "ec8/64-pci", BRD_ECH64PCI },
{ "ech-pci", BRD_ECH64PCI },
{ "echpci", BRD_ECH64PCI },
{ "echpc", BRD_ECH64PCI },
{ "27", BRD_ECH64PCI },
{ "easyio-pc", BRD_EASYIOPCI },
{ "easyio-pci", BRD_EASYIOPCI },
{ "eio-pci", BRD_EASYIOPCI },
{ "eiopci", BRD_EASYIOPCI },
{ "28", BRD_EASYIOPCI },
};
/*
* Define the module agruments.
*/
MODULE_AUTHOR("Greg Ungerer");
MODULE_DESCRIPTION("Stallion Multiport Serial Driver");
MODULE_LICENSE("GPL");
module_param_array(board0, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board0, "Board 0 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board1, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board1, "Board 1 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board2, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board2, "Board 2 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board3, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board3, "Board 3 config -> name[,ioaddr[,ioaddr2][,irq]]");
/*****************************************************************************/
/*
* Hardware ID bits for the EasyIO and ECH boards. These defines apply
* to the directly accessible io ports of these boards (not the uarts -
* they are in cd1400.h and sc26198.h).
*/
#define EIO_8PORTRS 0x04
#define EIO_4PORTRS 0x05
#define EIO_8PORTDI 0x00
#define EIO_8PORTM 0x06
#define EIO_MK3 0x03
#define EIO_IDBITMASK 0x07
#define EIO_BRDMASK 0xf0
#define ID_BRD4 0x10
#define ID_BRD8 0x20
#define ID_BRD16 0x30
#define EIO_INTRPEND 0x08
#define EIO_INTEDGE 0x00
#define EIO_INTLEVEL 0x08
#define EIO_0WS 0x10
#define ECH_ID 0xa0
#define ECH_IDBITMASK 0xe0
#define ECH_BRDENABLE 0x08
#define ECH_BRDDISABLE 0x00
#define ECH_INTENABLE 0x01
#define ECH_INTDISABLE 0x00
#define ECH_INTLEVEL 0x02
#define ECH_INTEDGE 0x00
#define ECH_INTRPEND 0x01
#define ECH_BRDRESET 0x01
#define ECHMC_INTENABLE 0x01
#define ECHMC_BRDRESET 0x02
#define ECH_PNLSTATUS 2
#define ECH_PNL16PORT 0x20
#define ECH_PNLIDMASK 0x07
#define ECH_PNLXPID 0x40
#define ECH_PNLINTRPEND 0x80
#define ECH_ADDR2MASK 0x1e0
/*
* Define the vector mapping bits for the programmable interrupt board
* hardware. These bits encode the interrupt for the board to use - it
* is software selectable (except the EIO-8M).
*/
static unsigned char stl_vecmap[] = {
0xff, 0xff, 0xff, 0x04, 0x06, 0x05, 0xff, 0x07,
0xff, 0xff, 0x00, 0x02, 0x01, 0xff, 0xff, 0x03
};
/*
* Lock ordering is that you may not take stallion_lock holding
* brd_lock.
*/
static spinlock_t brd_lock; /* Guard the board mapping */
static spinlock_t stallion_lock; /* Guard the tty driver */
/*
* Set up enable and disable macros for the ECH boards. They require
* the secondary io address space to be activated and deactivated.
* This way all ECH boards can share their secondary io region.
* If this is an ECH-PCI board then also need to set the page pointer
* to point to the correct page.
*/
#define BRDENABLE(brdnr,pagenr) \
if (stl_brds[(brdnr)]->brdtype == BRD_ECH) \
outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDENABLE), \
stl_brds[(brdnr)]->ioctrl); \
else if (stl_brds[(brdnr)]->brdtype == BRD_ECHPCI) \
outb((pagenr), stl_brds[(brdnr)]->ioctrl);
#define BRDDISABLE(brdnr) \
if (stl_brds[(brdnr)]->brdtype == BRD_ECH) \
outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDDISABLE), \
stl_brds[(brdnr)]->ioctrl);
#define STL_CD1400MAXBAUD 230400
#define STL_SC26198MAXBAUD 460800
#define STL_BAUDBASE 115200
#define STL_CLOSEDELAY (5 * HZ / 10)
/*****************************************************************************/
#ifdef CONFIG_PCI
/*
* Define the Stallion PCI vendor and device IDs.
*/
#ifndef PCI_VENDOR_ID_STALLION
#define PCI_VENDOR_ID_STALLION 0x124d
#endif
#ifndef PCI_DEVICE_ID_ECHPCI832
#define PCI_DEVICE_ID_ECHPCI832 0x0000
#endif
#ifndef PCI_DEVICE_ID_ECHPCI864
#define PCI_DEVICE_ID_ECHPCI864 0x0002
#endif
#ifndef PCI_DEVICE_ID_EIOPCI
#define PCI_DEVICE_ID_EIOPCI 0x0003
#endif
/*
* Define structure to hold all Stallion PCI boards.
*/
typedef struct stlpcibrd {
unsigned short vendid;
unsigned short devid;
int brdtype;
} stlpcibrd_t;
static stlpcibrd_t stl_pcibrds[] = {
{ PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI864, BRD_ECH64PCI },
{ PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_EIOPCI, BRD_EASYIOPCI },
{ PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI832, BRD_ECHPCI },
{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87410, BRD_ECHPCI },
};
static int stl_nrpcibrds = ARRAY_SIZE(stl_pcibrds);
#endif
/*****************************************************************************/
/*
* Define macros to extract a brd/port number from a minor number.
*/
#define MINOR2BRD(min) (((min) & 0xc0) >> 6)
#define MINOR2PORT(min) ((min) & 0x3f)
/*
* Define a baud rate table that converts termios baud rate selector
* into the actual baud rate value. All baud rate calculations are
* based on the actual baud rate required.
*/
static unsigned int stl_baudrates[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
};
/*
* Define some handy local macros...
*/
#undef MIN
#define MIN(a,b) (((a) <= (b)) ? (a) : (b))
#undef TOLOWER
#define TOLOWER(x) ((((x) >= 'A') && ((x) <= 'Z')) ? ((x) + 0x20) : (x))
/*****************************************************************************/
/*
* Declare all those functions in this driver!
*/
static void stl_argbrds(void);
static int stl_parsebrd(stlconf_t *confp, char **argp);
static unsigned long stl_atol(char *str);
static int stl_init(void);
static int stl_open(struct tty_struct *tty, struct file *filp);
static void stl_close(struct tty_struct *tty, struct file *filp);
static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count);
static void stl_putchar(struct tty_struct *tty, unsigned char ch);
static void stl_flushchars(struct tty_struct *tty);
static int stl_writeroom(struct tty_struct *tty);
static int stl_charsinbuffer(struct tty_struct *tty);
static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
static void stl_settermios(struct tty_struct *tty, struct termios *old);
static void stl_throttle(struct tty_struct *tty);
static void stl_unthrottle(struct tty_struct *tty);
static void stl_stop(struct tty_struct *tty);
static void stl_start(struct tty_struct *tty);
static void stl_flushbuffer(struct tty_struct *tty);
static void stl_breakctl(struct tty_struct *tty, int state);
static void stl_waituntilsent(struct tty_struct *tty, int timeout);
static void stl_sendxchar(struct tty_struct *tty, char ch);
static void stl_hangup(struct tty_struct *tty);
static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
static int stl_portinfo(stlport_t *portp, int portnr, char *pos);
static int stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data);
static int stl_brdinit(stlbrd_t *brdp);
static int stl_initports(stlbrd_t *brdp, stlpanel_t *panelp);
static int stl_getserial(stlport_t *portp, struct serial_struct __user *sp);
static int stl_setserial(stlport_t *portp, struct serial_struct __user *sp);
static int stl_getbrdstats(combrd_t __user *bp);
static int stl_getportstats(stlport_t *portp, comstats_t __user *cp);
static int stl_clrportstats(stlport_t *portp, comstats_t __user *cp);
static int stl_getportstruct(stlport_t __user *arg);
static int stl_getbrdstruct(stlbrd_t __user *arg);
static int stl_waitcarrier(stlport_t *portp, struct file *filp);
static int stl_eiointr(stlbrd_t *brdp);
static int stl_echatintr(stlbrd_t *brdp);
static int stl_echmcaintr(stlbrd_t *brdp);
static int stl_echpciintr(stlbrd_t *brdp);
static int stl_echpci64intr(stlbrd_t *brdp);
static void stl_offintr(void *private);
static stlbrd_t *stl_allocbrd(void);
static stlport_t *stl_getport(int brdnr, int panelnr, int portnr);
static inline int stl_initbrds(void);
static inline int stl_initeio(stlbrd_t *brdp);
static inline int stl_initech(stlbrd_t *brdp);
static inline int stl_getbrdnr(void);
#ifdef CONFIG_PCI
static inline int stl_findpcibrds(void);
static inline int stl_initpcibrd(int brdtype, struct pci_dev *devp);
#endif
/*
* CD1400 uart specific handling functions.
*/
static void stl_cd1400setreg(stlport_t *portp, int regnr, int value);
static int stl_cd1400getreg(stlport_t *portp, int regnr);
static int stl_cd1400updatereg(stlport_t *portp, int regnr, int value);
static int stl_cd1400panelinit(stlbrd_t *brdp, stlpanel_t *panelp);
static void stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
static void stl_cd1400setport(stlport_t *portp, struct termios *tiosp);
static int stl_cd1400getsignals(stlport_t *portp);
static void stl_cd1400setsignals(stlport_t *portp, int dtr, int rts);
static void stl_cd1400ccrwait(stlport_t *portp);
static void stl_cd1400enablerxtx(stlport_t *portp, int rx, int tx);
static void stl_cd1400startrxtx(stlport_t *portp, int rx, int tx);
static void stl_cd1400disableintrs(stlport_t *portp);
static void stl_cd1400sendbreak(stlport_t *portp, int len);
static void stl_cd1400flowctrl(stlport_t *portp, int state);
static void stl_cd1400sendflow(stlport_t *portp, int state);
static void stl_cd1400flush(stlport_t *portp);
static int stl_cd1400datastate(stlport_t *portp);
static void stl_cd1400eiointr(stlpanel_t *panelp, unsigned int iobase);
static void stl_cd1400echintr(stlpanel_t *panelp, unsigned int iobase);
static void stl_cd1400txisr(stlpanel_t *panelp, int ioaddr);
static void stl_cd1400rxisr(stlpanel_t *panelp, int ioaddr);
static void stl_cd1400mdmisr(stlpanel_t *panelp, int ioaddr);
static inline int stl_cd1400breakisr(stlport_t *portp, int ioaddr);
/*
* SC26198 uart specific handling functions.
*/
static void stl_sc26198setreg(stlport_t *portp, int regnr, int value);
static int stl_sc26198getreg(stlport_t *portp, int regnr);
static int stl_sc26198updatereg(stlport_t *portp, int regnr, int value);
static int stl_sc26198getglobreg(stlport_t *portp, int regnr);
static int stl_sc26198panelinit(stlbrd_t *brdp, stlpanel_t *panelp);
static void stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
static void stl_sc26198setport(stlport_t *portp, struct termios *tiosp);
static int stl_sc26198getsignals(stlport_t *portp);
static void stl_sc26198setsignals(stlport_t *portp, int dtr, int rts);
static void stl_sc26198enablerxtx(stlport_t *portp, int rx, int tx);
static void stl_sc26198startrxtx(stlport_t *portp, int rx, int tx);
static void stl_sc26198disableintrs(stlport_t *portp);
static void stl_sc26198sendbreak(stlport_t *portp, int len);
static void stl_sc26198flowctrl(stlport_t *portp, int state);
static void stl_sc26198sendflow(stlport_t *portp, int state);
static void stl_sc26198flush(stlport_t *portp);
static int stl_sc26198datastate(stlport_t *portp);
static void stl_sc26198wait(stlport_t *portp);
static void stl_sc26198txunflow(stlport_t *portp, struct tty_struct *tty);
static void stl_sc26198intr(stlpanel_t *panelp, unsigned int iobase);
static void stl_sc26198txisr(stlport_t *port);
static void stl_sc26198rxisr(stlport_t *port, unsigned int iack);
static void stl_sc26198rxbadch(stlport_t *portp, unsigned char status, char ch);
static void stl_sc26198rxbadchars(stlport_t *portp);
static void stl_sc26198otherisr(stlport_t *port, unsigned int iack);
/*****************************************************************************/
/*
* Generic UART support structure.
*/
typedef struct uart {
int (*panelinit)(stlbrd_t *brdp, stlpanel_t *panelp);
void (*portinit)(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
void (*setport)(stlport_t *portp, struct termios *tiosp);
int (*getsignals)(stlport_t *portp);
void (*setsignals)(stlport_t *portp, int dtr, int rts);
void (*enablerxtx)(stlport_t *portp, int rx, int tx);
void (*startrxtx)(stlport_t *portp, int rx, int tx);
void (*disableintrs)(stlport_t *portp);
void (*sendbreak)(stlport_t *portp, int len);
void (*flowctrl)(stlport_t *portp, int state);
void (*sendflow)(stlport_t *portp, int state);
void (*flush)(stlport_t *portp);
int (*datastate)(stlport_t *portp);
void (*intr)(stlpanel_t *panelp, unsigned int iobase);
} uart_t;
/*
* Define some macros to make calling these functions nice and clean.
*/
#define stl_panelinit (* ((uart_t *) panelp->uartp)->panelinit)
#define stl_portinit (* ((uart_t *) portp->uartp)->portinit)
#define stl_setport (* ((uart_t *) portp->uartp)->setport)
#define stl_getsignals (* ((uart_t *) portp->uartp)->getsignals)
#define stl_setsignals (* ((uart_t *) portp->uartp)->setsignals)
#define stl_enablerxtx (* ((uart_t *) portp->uartp)->enablerxtx)
#define stl_startrxtx (* ((uart_t *) portp->uartp)->startrxtx)
#define stl_disableintrs (* ((uart_t *) portp->uartp)->disableintrs)
#define stl_sendbreak (* ((uart_t *) portp->uartp)->sendbreak)
#define stl_flowctrl (* ((uart_t *) portp->uartp)->flowctrl)
#define stl_sendflow (* ((uart_t *) portp->uartp)->sendflow)
#define stl_flush (* ((uart_t *) portp->uartp)->flush)
#define stl_datastate (* ((uart_t *) portp->uartp)->datastate)
/*****************************************************************************/
/*
* CD1400 UART specific data initialization.
*/
static uart_t stl_cd1400uart = {
stl_cd1400panelinit,
stl_cd1400portinit,
stl_cd1400setport,
stl_cd1400getsignals,
stl_cd1400setsignals,
stl_cd1400enablerxtx,
stl_cd1400startrxtx,
stl_cd1400disableintrs,
stl_cd1400sendbreak,
stl_cd1400flowctrl,
stl_cd1400sendflow,
stl_cd1400flush,
stl_cd1400datastate,
stl_cd1400eiointr
};
/*
* Define the offsets within the register bank of a cd1400 based panel.
* These io address offsets are common to the EasyIO board as well.
*/
#define EREG_ADDR 0
#define EREG_DATA 4
#define EREG_RXACK 5
#define EREG_TXACK 6
#define EREG_MDACK 7
#define EREG_BANKSIZE 8
#define CD1400_CLK 25000000
#define CD1400_CLK8M 20000000
/*
* Define the cd1400 baud rate clocks. These are used when calculating
* what clock and divisor to use for the required baud rate. Also
* define the maximum baud rate allowed, and the default base baud.
*/
static int stl_cd1400clkdivs[] = {
CD1400_CLK0, CD1400_CLK1, CD1400_CLK2, CD1400_CLK3, CD1400_CLK4
};
/*****************************************************************************/
/*
* SC26198 UART specific data initization.
*/
static uart_t stl_sc26198uart = {
stl_sc26198panelinit,
stl_sc26198portinit,
stl_sc26198setport,
stl_sc26198getsignals,
stl_sc26198setsignals,
stl_sc26198enablerxtx,
stl_sc26198startrxtx,
stl_sc26198disableintrs,
stl_sc26198sendbreak,
stl_sc26198flowctrl,
stl_sc26198sendflow,
stl_sc26198flush,
stl_sc26198datastate,
stl_sc26198intr
};
/*
* Define the offsets within the register bank of a sc26198 based panel.
*/
#define XP_DATA 0
#define XP_ADDR 1
#define XP_MODID 2
#define XP_STATUS 2
#define XP_IACK 3
#define XP_BANKSIZE 4
/*
* Define the sc26198 baud rate table. Offsets within the table
* represent the actual baud rate selector of sc26198 registers.
*/
static unsigned int sc26198_baudtable[] = {
50, 75, 150, 200, 300, 450, 600, 900, 1200, 1800, 2400, 3600,
4800, 7200, 9600, 14400, 19200, 28800, 38400, 57600, 115200,
230400, 460800, 921600
};
#define SC26198_NRBAUDS ARRAY_SIZE(sc26198_baudtable)
/*****************************************************************************/
/*
* Define the driver info for a user level control device. Used mainly
* to get at port stats - only not using the port device itself.
*/
static struct file_operations stl_fsiomem = {
.owner = THIS_MODULE,
.ioctl = stl_memioctl,
};
/*****************************************************************************/
static struct class *stallion_class;
/*
* Loadable module initialization stuff.
*/
static int __init stallion_module_init(void)
{
stl_init();
return 0;
}
/*****************************************************************************/
static void __exit stallion_module_exit(void)
{
stlbrd_t *brdp;
stlpanel_t *panelp;
stlport_t *portp;
int i, j, k;
#ifdef DEBUG
printk("cleanup_module()\n");
#endif
printk(KERN_INFO "Unloading %s: version %s\n", stl_drvtitle,
stl_drvversion);
/*
* Free up all allocated resources used by the ports. This includes
* memory and interrupts. As part of this process we will also do
* a hangup on every open port - to try to flush out any processes
* hanging onto ports.
*/
i = tty_unregister_driver(stl_serial);
put_tty_driver(stl_serial);
if (i) {
printk("STALLION: failed to un-register tty driver, "
"errno=%d\n", -i);
return;
}
for (i = 0; i < 4; i++)
class_device_destroy(stallion_class, MKDEV(STL_SIOMEMMAJOR, i));
if ((i = unregister_chrdev(STL_SIOMEMMAJOR, "staliomem")))
printk("STALLION: failed to un-register serial memory device, "
"errno=%d\n", -i);
class_destroy(stallion_class);
for (i = 0; (i < stl_nrbrds); i++) {
if ((brdp = stl_brds[i]) == (stlbrd_t *) NULL)
continue;
free_irq(brdp->irq, brdp);
for (j = 0; (j < STL_MAXPANELS); j++) {
panelp = brdp->panels[j];
if (panelp == (stlpanel_t *) NULL)
continue;
for (k = 0; (k < STL_PORTSPERPANEL); k++) {
portp = panelp->ports[k];
if (portp == (stlport_t *) NULL)
continue;
if (portp->tty != (struct tty_struct *) NULL)
stl_hangup(portp->tty);
kfree(portp->tx.buf);
kfree(portp);
}
kfree(panelp);
}
release_region(brdp->ioaddr1, brdp->iosize1);
if (brdp->iosize2 > 0)
release_region(brdp->ioaddr2, brdp->iosize2);
kfree(brdp);
stl_brds[i] = (stlbrd_t *) NULL;
}
}
module_init(stallion_module_init);
module_exit(stallion_module_exit);
/*****************************************************************************/
/*
* Check for any arguments passed in on the module load command line.
*/
static void stl_argbrds(void)
{
stlconf_t conf;
stlbrd_t *brdp;
int i;
#ifdef DEBUG
printk("stl_argbrds()\n");
#endif
for (i = stl_nrbrds; (i < stl_nargs); i++) {
memset(&conf, 0, sizeof(conf));
if (stl_parsebrd(&conf, stl_brdsp[i]) == 0)
continue;
if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
continue;
stl_nrbrds = i + 1;
brdp->brdnr = i;
brdp->brdtype = conf.brdtype;
brdp->ioaddr1 = conf.ioaddr1;
brdp->ioaddr2 = conf.ioaddr2;
brdp->irq = conf.irq;
brdp->irqtype = conf.irqtype;
stl_brdinit(brdp);
}
}
/*****************************************************************************/
/*
* Convert an ascii string number into an unsigned long.
*/
static unsigned long stl_atol(char *str)
{
unsigned long val;
int base, c;
char *sp;
val = 0;
sp = str;
if ((*sp == '0') && (*(sp+1) == 'x')) {
base = 16;
sp += 2;
} else if (*sp == '0') {
base = 8;
sp++;
} else {
base = 10;
}
for (; (*sp != 0); sp++) {
c = (*sp > '9') ? (TOLOWER(*sp) - 'a' + 10) : (*sp - '0');
if ((c < 0) || (c >= base)) {
printk("STALLION: invalid argument %s\n", str);
val = 0;
break;
}
val = (val * base) + c;
}
return val;
}
/*****************************************************************************/
/*
* Parse the supplied argument string, into the board conf struct.
*/
static int stl_parsebrd(stlconf_t *confp, char **argp)
{
char *sp;
int i;
#ifdef DEBUG
printk("stl_parsebrd(confp=%x,argp=%x)\n", (int) confp, (int) argp);
#endif
if ((argp[0] == (char *) NULL) || (*argp[0] == 0))
return 0;
for (sp = argp[0], i = 0; ((*sp != 0) && (i < 25)); sp++, i++)
*sp = TOLOWER(*sp);
for (i = 0; i < ARRAY_SIZE(stl_brdstr); i++) {
if (strcmp(stl_brdstr[i].name, argp[0]) == 0)
break;
}
if (i == ARRAY_SIZE(stl_brdstr)) {
printk("STALLION: unknown board name, %s?\n", argp[0]);
return 0;
}
confp->brdtype = stl_brdstr[i].type;
i = 1;
if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
confp->ioaddr1 = stl_atol(argp[i]);
i++;
if (confp->brdtype == BRD_ECH) {
if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
confp->ioaddr2 = stl_atol(argp[i]);
i++;
}
if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
confp->irq = stl_atol(argp[i]);
return 1;
}
/*****************************************************************************/
/*
* Allocate a new board structure. Fill out the basic info in it.
*/
static stlbrd_t *stl_allocbrd(void)
{
stlbrd_t *brdp;
brdp = kzalloc(sizeof(stlbrd_t), GFP_KERNEL);
if (!brdp) {
printk("STALLION: failed to allocate memory (size=%Zd)\n",
sizeof(stlbrd_t));
return NULL;
}
brdp->magic = STL_BOARDMAGIC;
return brdp;
}
/*****************************************************************************/
static int stl_open(struct tty_struct *tty, struct file *filp)
{
stlport_t *portp;
stlbrd_t *brdp;
unsigned int minordev;
int brdnr, panelnr, portnr, rc;
#ifdef DEBUG
printk("stl_open(tty=%x,filp=%x): device=%s\n", (int) tty,
(int) filp, tty->name);
#endif
minordev = tty->index;
brdnr = MINOR2BRD(minordev);
if (brdnr >= stl_nrbrds)
return -ENODEV;
brdp = stl_brds[brdnr];
if (brdp == (stlbrd_t *) NULL)
return -ENODEV;
minordev = MINOR2PORT(minordev);
for (portnr = -1, panelnr = 0; (panelnr < STL_MAXPANELS); panelnr++) {
if (brdp->panels[panelnr] == (stlpanel_t *) NULL)
break;
if (minordev < brdp->panels[panelnr]->nrports) {
portnr = minordev;
break;
}
minordev -= brdp->panels[panelnr]->nrports;
}
if (portnr < 0)
return -ENODEV;
portp = brdp->panels[panelnr]->ports[portnr];
if (portp == (stlport_t *) NULL)
return -ENODEV;
/*
* On the first open of the device setup the port hardware, and
* initialize the per port data structure.
*/
portp->tty = tty;
tty->driver_data = portp;
portp->refcount++;
if ((portp->flags & ASYNC_INITIALIZED) == 0) {
if (!portp->tx.buf) {
portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
if (!portp->tx.buf)
return -ENOMEM;
portp->tx.head = portp->tx.buf;
portp->tx.tail = portp->tx.buf;
}
stl_setport(portp, tty->termios);
portp->sigs = stl_getsignals(portp);
stl_setsignals(portp, 1, 1);
stl_enablerxtx(portp, 1, 1);
stl_startrxtx(portp, 1, 0);
clear_bit(TTY_IO_ERROR, &tty->flags);
portp->flags |= ASYNC_INITIALIZED;
}
/*
* Check if this port is in the middle of closing. If so then wait
* until it is closed then return error status, based on flag settings.
* The sleep here does not need interrupt protection since the wakeup
* for it is done with the same context.
*/
if (portp->flags & ASYNC_CLOSING) {
interruptible_sleep_on(&portp->close_wait);
if (portp->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
return -ERESTARTSYS;
}
/*
* Based on type of open being done check if it can overlap with any
* previous opens still in effect. If we are a normal serial device
* then also we might have to wait for carrier.
*/
if (!(filp->f_flags & O_NONBLOCK)) {
if ((rc = stl_waitcarrier(portp, filp)) != 0)
return rc;
}
portp->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
/*****************************************************************************/
/*
* Possibly need to wait for carrier (DCD signal) to come high. Say
* maybe because if we are clocal then we don't need to wait...
*/
static int stl_waitcarrier(stlport_t *portp, struct file *filp)
{
unsigned long flags;
int rc, doclocal;
#ifdef DEBUG
printk("stl_waitcarrier(portp=%x,filp=%x)\n", (int) portp, (int) filp);
#endif
rc = 0;
doclocal = 0;
spin_lock_irqsave(&stallion_lock, flags);
if (portp->tty->termios->c_cflag & CLOCAL)
doclocal++;
portp->openwaitcnt++;
if (! tty_hung_up_p(filp))
portp->refcount--;
for (;;) {
/* Takes brd_lock internally */
stl_setsignals(portp, 1, 1);
if (tty_hung_up_p(filp) ||
((portp->flags & ASYNC_INITIALIZED) == 0)) {
if (portp->flags & ASYNC_HUP_NOTIFY)
rc = -EBUSY;
else
rc = -ERESTARTSYS;
break;
}
if (((portp->flags & ASYNC_CLOSING) == 0) &&
(doclocal || (portp->sigs & TIOCM_CD))) {
break;
}
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
/* FIXME */
interruptible_sleep_on(&portp->open_wait);
}
if (! tty_hung_up_p(filp))
portp->refcount++;
portp->openwaitcnt--;
spin_unlock_irqrestore(&stallion_lock, flags);
return rc;
}
/*****************************************************************************/
static void stl_close(struct tty_struct *tty, struct file *filp)
{
stlport_t *portp;
unsigned long flags;
#ifdef DEBUG
printk("stl_close(tty=%x,filp=%x)\n", (int) tty, (int) filp);
#endif
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
spin_lock_irqsave(&stallion_lock, flags);
if (tty_hung_up_p(filp)) {
spin_unlock_irqrestore(&stallion_lock, flags);
return;
}
if ((tty->count == 1) && (portp->refcount != 1))
portp->refcount = 1;
if (portp->refcount-- > 1) {
spin_unlock_irqrestore(&stallion_lock, flags);
return;
}
portp->refcount = 0;
portp->flags |= ASYNC_CLOSING;
/*
* May want to wait for any data to drain before closing. The BUSY
* flag keeps track of whether we are still sending or not - it is
* very accurate for the cd1400, not quite so for the sc26198.
* (The sc26198 has no "end-of-data" interrupt only empty FIFO)
*/
tty->closing = 1;
spin_unlock_irqrestore(&stallion_lock, flags);
if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, portp->closing_wait);
stl_waituntilsent(tty, (HZ / 2));
spin_lock_irqsave(&stallion_lock, flags);
portp->flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&stallion_lock, flags);
stl_disableintrs(portp);
if (tty->termios->c_cflag & HUPCL)
stl_setsignals(portp, 0, 0);
stl_enablerxtx(portp, 0, 0);
stl_flushbuffer(tty);
portp->istate = 0;
if (portp->tx.buf != (char *) NULL) {
kfree(portp->tx.buf);
portp->tx.buf = (char *) NULL;
portp->tx.head = (char *) NULL;
portp->tx.tail = (char *) NULL;
}
set_bit(TTY_IO_ERROR, &tty->flags);
tty_ldisc_flush(tty);
tty->closing = 0;
portp->tty = (struct tty_struct *) NULL;
if (portp->openwaitcnt) {
if (portp->close_delay)
msleep_interruptible(jiffies_to_msecs(portp->close_delay));
wake_up_interruptible(&portp->open_wait);
}
portp->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&portp->close_wait);
}
/*****************************************************************************/
/*
* Write routine. Take data and stuff it in to the TX ring queue.
* If transmit interrupts are not running then start them.
*/
static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
stlport_t *portp;
unsigned int len, stlen;
unsigned char *chbuf;
char *head, *tail;
#ifdef DEBUG
printk("stl_write(tty=%x,buf=%x,count=%d)\n",
(int) tty, (int) buf, count);
#endif
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return 0;
if (portp->tx.buf == (char *) NULL)
return 0;
/*
* If copying direct from user space we must cater for page faults,
* causing us to "sleep" here for a while. To handle this copy in all
* the data we need now, into a local buffer. Then when we got it all
* copy it into the TX buffer.
*/
chbuf = (unsigned char *) buf;
head = portp->tx.head;
tail = portp->tx.tail;
if (head >= tail) {
len = STL_TXBUFSIZE - (head - tail) - 1;
stlen = STL_TXBUFSIZE - (head - portp->tx.buf);
} else {
len = tail - head - 1;
stlen = len;
}
len = MIN(len, count);
count = 0;
while (len > 0) {
stlen = MIN(len, stlen);
memcpy(head, chbuf, stlen);
len -= stlen;
chbuf += stlen;
count += stlen;
head += stlen;
if (head >= (portp->tx.buf + STL_TXBUFSIZE)) {
head = portp->tx.buf;
stlen = tail - head;
}
}
portp->tx.head = head;
clear_bit(ASYI_TXLOW, &portp->istate);
stl_startrxtx(portp, -1, 1);
return count;
}
/*****************************************************************************/
static void stl_putchar(struct tty_struct *tty, unsigned char ch)
{
stlport_t *portp;
unsigned int len;
char *head, *tail;
#ifdef DEBUG
printk("stl_putchar(tty=%x,ch=%x)\n", (int) tty, (int) ch);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
if (portp->tx.buf == (char *) NULL)
return;
head = portp->tx.head;
tail = portp->tx.tail;
len = (head >= tail) ? (STL_TXBUFSIZE - (head - tail)) : (tail - head);
len--;
if (len > 0) {
*head++ = ch;
if (head >= (portp->tx.buf + STL_TXBUFSIZE))
head = portp->tx.buf;
}
portp->tx.head = head;
}
/*****************************************************************************/
/*
* If there are any characters in the buffer then make sure that TX
* interrupts are on and get'em out. Normally used after the putchar
* routine has been called.
*/
static void stl_flushchars(struct tty_struct *tty)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_flushchars(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
if (portp->tx.buf == (char *) NULL)
return;
stl_startrxtx(portp, -1, 1);
}
/*****************************************************************************/
static int stl_writeroom(struct tty_struct *tty)
{
stlport_t *portp;
char *head, *tail;
#ifdef DEBUG
printk("stl_writeroom(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return 0;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return 0;
if (portp->tx.buf == (char *) NULL)
return 0;
head = portp->tx.head;
tail = portp->tx.tail;
return ((head >= tail) ? (STL_TXBUFSIZE - (head - tail) - 1) : (tail - head - 1));
}
/*****************************************************************************/
/*
* Return number of chars in the TX buffer. Normally we would just
* calculate the number of chars in the buffer and return that, but if
* the buffer is empty and TX interrupts are still on then we return
* that the buffer still has 1 char in it. This way whoever called us
* will not think that ALL chars have drained - since the UART still
* must have some chars in it (we are busy after all).
*/
static int stl_charsinbuffer(struct tty_struct *tty)
{
stlport_t *portp;
unsigned int size;
char *head, *tail;
#ifdef DEBUG
printk("stl_charsinbuffer(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return 0;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return 0;
if (portp->tx.buf == (char *) NULL)
return 0;
head = portp->tx.head;
tail = portp->tx.tail;
size = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
if ((size == 0) && test_bit(ASYI_TXBUSY, &portp->istate))
size = 1;
return size;
}
/*****************************************************************************/
/*
* Generate the serial struct info.
*/
static int stl_getserial(stlport_t *portp, struct serial_struct __user *sp)
{
struct serial_struct sio;
stlbrd_t *brdp;
#ifdef DEBUG
printk("stl_getserial(portp=%x,sp=%x)\n", (int) portp, (int) sp);
#endif
memset(&sio, 0, sizeof(struct serial_struct));
sio.line = portp->portnr;
sio.port = portp->ioaddr;
sio.flags = portp->flags;
sio.baud_base = portp->baud_base;
sio.close_delay = portp->close_delay;
sio.closing_wait = portp->closing_wait;
sio.custom_divisor = portp->custom_divisor;
sio.hub6 = 0;
if (portp->uartp == &stl_cd1400uart) {
sio.type = PORT_CIRRUS;
sio.xmit_fifo_size = CD1400_TXFIFOSIZE;
} else {
sio.type = PORT_UNKNOWN;
sio.xmit_fifo_size = SC26198_TXFIFOSIZE;
}
brdp = stl_brds[portp->brdnr];
if (brdp != (stlbrd_t *) NULL)
sio.irq = brdp->irq;
return copy_to_user(sp, &sio, sizeof(struct serial_struct)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Set port according to the serial struct info.
* At this point we do not do any auto-configure stuff, so we will
* just quietly ignore any requests to change irq, etc.
*/
static int stl_setserial(stlport_t *portp, struct serial_struct __user *sp)
{
struct serial_struct sio;
#ifdef DEBUG
printk("stl_setserial(portp=%x,sp=%x)\n", (int) portp, (int) sp);
#endif
if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
return -EFAULT;
if (!capable(CAP_SYS_ADMIN)) {
if ((sio.baud_base != portp->baud_base) ||
(sio.close_delay != portp->close_delay) ||
((sio.flags & ~ASYNC_USR_MASK) !=
(portp->flags & ~ASYNC_USR_MASK)))
return -EPERM;
}
portp->flags = (portp->flags & ~ASYNC_USR_MASK) |
(sio.flags & ASYNC_USR_MASK);
portp->baud_base = sio.baud_base;
portp->close_delay = sio.close_delay;
portp->closing_wait = sio.closing_wait;
portp->custom_divisor = sio.custom_divisor;
stl_setport(portp, portp->tty->termios);
return 0;
}
/*****************************************************************************/
static int stl_tiocmget(struct tty_struct *tty, struct file *file)
{
stlport_t *portp;
if (tty == (struct tty_struct *) NULL)
return -ENODEV;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return -ENODEV;
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
return stl_getsignals(portp);
}
static int stl_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
stlport_t *portp;
int rts = -1, dtr = -1;
if (tty == (struct tty_struct *) NULL)
return -ENODEV;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return -ENODEV;
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
if (set & TIOCM_RTS)
rts = 1;
if (set & TIOCM_DTR)
dtr = 1;
if (clear & TIOCM_RTS)
rts = 0;
if (clear & TIOCM_DTR)
dtr = 0;
stl_setsignals(portp, dtr, rts);
return 0;
}
static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
stlport_t *portp;
unsigned int ival;
int rc;
void __user *argp = (void __user *)arg;
#ifdef DEBUG
printk("stl_ioctl(tty=%x,file=%x,cmd=%x,arg=%x)\n",
(int) tty, (int) file, cmd, (int) arg);
#endif
if (tty == (struct tty_struct *) NULL)
return -ENODEV;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != COM_GETPORTSTATS) && (cmd != COM_CLRPORTSTATS)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
rc = 0;
switch (cmd) {
case TIOCGSOFTCAR:
rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
(unsigned __user *) argp);
break;
case TIOCSSOFTCAR:
if (get_user(ival, (unsigned int __user *) arg))
return -EFAULT;
tty->termios->c_cflag =
(tty->termios->c_cflag & ~CLOCAL) |
(ival ? CLOCAL : 0);
break;
case TIOCGSERIAL:
rc = stl_getserial(portp, argp);
break;
case TIOCSSERIAL:
rc = stl_setserial(portp, argp);
break;
case COM_GETPORTSTATS:
rc = stl_getportstats(portp, argp);
break;
case COM_CLRPORTSTATS:
rc = stl_clrportstats(portp, argp);
break;
case TIOCSERCONFIG:
case TIOCSERGWILD:
case TIOCSERSWILD:
case TIOCSERGETLSR:
case TIOCSERGSTRUCT:
case TIOCSERGETMULTI:
case TIOCSERSETMULTI:
default:
rc = -ENOIOCTLCMD;
break;
}
return rc;
}
/*****************************************************************************/
static void stl_settermios(struct tty_struct *tty, struct termios *old)
{
stlport_t *portp;
struct termios *tiosp;
#ifdef DEBUG
printk("stl_settermios(tty=%x,old=%x)\n", (int) tty, (int) old);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
tiosp = tty->termios;
if ((tiosp->c_cflag == old->c_cflag) &&
(tiosp->c_iflag == old->c_iflag))
return;
stl_setport(portp, tiosp);
stl_setsignals(portp, ((tiosp->c_cflag & (CBAUD & ~CBAUDEX)) ? 1 : 0),
-1);
if ((old->c_cflag & CRTSCTS) && ((tiosp->c_cflag & CRTSCTS) == 0)) {
tty->hw_stopped = 0;
stl_start(tty);
}
if (((old->c_cflag & CLOCAL) == 0) && (tiosp->c_cflag & CLOCAL))
wake_up_interruptible(&portp->open_wait);
}
/*****************************************************************************/
/*
* Attempt to flow control who ever is sending us data. Based on termios
* settings use software or/and hardware flow control.
*/
static void stl_throttle(struct tty_struct *tty)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_throttle(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
stl_flowctrl(portp, 0);
}
/*****************************************************************************/
/*
* Unflow control the device sending us data...
*/
static void stl_unthrottle(struct tty_struct *tty)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_unthrottle(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
stl_flowctrl(portp, 1);
}
/*****************************************************************************/
/*
* Stop the transmitter. Basically to do this we will just turn TX
* interrupts off.
*/
static void stl_stop(struct tty_struct *tty)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_stop(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
stl_startrxtx(portp, -1, 0);
}
/*****************************************************************************/
/*
* Start the transmitter again. Just turn TX interrupts back on.
*/
static void stl_start(struct tty_struct *tty)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_start(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
stl_startrxtx(portp, -1, 1);
}
/*****************************************************************************/
/*
* Hangup this port. This is pretty much like closing the port, only
* a little more brutal. No waiting for data to drain. Shutdown the
* port and maybe drop signals.
*/
static void stl_hangup(struct tty_struct *tty)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_hangup(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
portp->flags &= ~ASYNC_INITIALIZED;
stl_disableintrs(portp);
if (tty->termios->c_cflag & HUPCL)
stl_setsignals(portp, 0, 0);
stl_enablerxtx(portp, 0, 0);
stl_flushbuffer(tty);
portp->istate = 0;
set_bit(TTY_IO_ERROR, &tty->flags);
if (portp->tx.buf != (char *) NULL) {
kfree(portp->tx.buf);
portp->tx.buf = (char *) NULL;
portp->tx.head = (char *) NULL;
portp->tx.tail = (char *) NULL;
}
portp->tty = (struct tty_struct *) NULL;
portp->flags &= ~ASYNC_NORMAL_ACTIVE;
portp->refcount = 0;
wake_up_interruptible(&portp->open_wait);
}
/*****************************************************************************/
static void stl_flushbuffer(struct tty_struct *tty)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_flushbuffer(tty=%x)\n", (int) tty);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
stl_flush(portp);
tty_wakeup(tty);
}
/*****************************************************************************/
static void stl_breakctl(struct tty_struct *tty, int state)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_breakctl(tty=%x,state=%d)\n", (int) tty, state);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
stl_sendbreak(portp, ((state == -1) ? 1 : 2));
}
/*****************************************************************************/
static void stl_waituntilsent(struct tty_struct *tty, int timeout)
{
stlport_t *portp;
unsigned long tend;
#ifdef DEBUG
printk("stl_waituntilsent(tty=%x,timeout=%d)\n", (int) tty, timeout);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
if (timeout == 0)
timeout = HZ;
tend = jiffies + timeout;
while (stl_datastate(portp)) {
if (signal_pending(current))
break;
msleep_interruptible(20);
if (time_after_eq(jiffies, tend))
break;
}
}
/*****************************************************************************/
static void stl_sendxchar(struct tty_struct *tty, char ch)
{
stlport_t *portp;
#ifdef DEBUG
printk("stl_sendxchar(tty=%x,ch=%x)\n", (int) tty, ch);
#endif
if (tty == (struct tty_struct *) NULL)
return;
portp = tty->driver_data;
if (portp == (stlport_t *) NULL)
return;
if (ch == STOP_CHAR(tty))
stl_sendflow(portp, 0);
else if (ch == START_CHAR(tty))
stl_sendflow(portp, 1);
else
stl_putchar(tty, ch);
}
/*****************************************************************************/
#define MAXLINE 80
/*
* Format info for a specified port. The line is deliberately limited
* to 80 characters. (If it is too long it will be truncated, if too
* short then padded with spaces).
*/
static int stl_portinfo(stlport_t *portp, int portnr, char *pos)
{
char *sp;
int sigs, cnt;
sp = pos;
sp += sprintf(sp, "%d: uart:%s tx:%d rx:%d",
portnr, (portp->hwid == 1) ? "SC26198" : "CD1400",
(int) portp->stats.txtotal, (int) portp->stats.rxtotal);
if (portp->stats.rxframing)
sp += sprintf(sp, " fe:%d", (int) portp->stats.rxframing);
if (portp->stats.rxparity)
sp += sprintf(sp, " pe:%d", (int) portp->stats.rxparity);
if (portp->stats.rxbreaks)
sp += sprintf(sp, " brk:%d", (int) portp->stats.rxbreaks);
if (portp->stats.rxoverrun)
sp += sprintf(sp, " oe:%d", (int) portp->stats.rxoverrun);
sigs = stl_getsignals(portp);
cnt = sprintf(sp, "%s%s%s%s%s ",
(sigs & TIOCM_RTS) ? "|RTS" : "",
(sigs & TIOCM_CTS) ? "|CTS" : "",
(sigs & TIOCM_DTR) ? "|DTR" : "",
(sigs & TIOCM_CD) ? "|DCD" : "",
(sigs & TIOCM_DSR) ? "|DSR" : "");
*sp = ' ';
sp += cnt;
for (cnt = (sp - pos); (cnt < (MAXLINE - 1)); cnt++)
*sp++ = ' ';
if (cnt >= MAXLINE)
pos[(MAXLINE - 2)] = '+';
pos[(MAXLINE - 1)] = '\n';
return MAXLINE;
}
/*****************************************************************************/
/*
* Port info, read from the /proc file system.
*/
static int stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data)
{
stlbrd_t *brdp;
stlpanel_t *panelp;
stlport_t *portp;
int brdnr, panelnr, portnr, totalport;
int curoff, maxoff;
char *pos;
#ifdef DEBUG
printk("stl_readproc(page=%x,start=%x,off=%x,count=%d,eof=%x,"
"data=%x\n", (int) page, (int) start, (int) off, count,
(int) eof, (int) data);
#endif
pos = page;
totalport = 0;
curoff = 0;
if (off == 0) {
pos += sprintf(pos, "%s: version %s", stl_drvtitle,
stl_drvversion);
while (pos < (page + MAXLINE - 1))
*pos++ = ' ';
*pos++ = '\n';
}
curoff = MAXLINE;
/*
* We scan through for each board, panel and port. The offset is
* calculated on the fly, and irrelevant ports are skipped.
*/
for (brdnr = 0; (brdnr < stl_nrbrds); brdnr++) {
brdp = stl_brds[brdnr];
if (brdp == (stlbrd_t *) NULL)
continue;
if (brdp->state == 0)
continue;
maxoff = curoff + (brdp->nrports * MAXLINE);
if (off >= maxoff) {
curoff = maxoff;
continue;
}
totalport = brdnr * STL_MAXPORTS;
for (panelnr = 0; (panelnr < brdp->nrpanels); panelnr++) {
panelp = brdp->panels[panelnr];
if (panelp == (stlpanel_t *) NULL)
continue;
maxoff = curoff + (panelp->nrports * MAXLINE);
if (off >= maxoff) {
curoff = maxoff;
totalport += panelp->nrports;
continue;
}
for (portnr = 0; (portnr < panelp->nrports); portnr++,
totalport++) {
portp = panelp->ports[portnr];
if (portp == (stlport_t *) NULL)
continue;
if (off >= (curoff += MAXLINE))
continue;
if ((pos - page + MAXLINE) > count)
goto stl_readdone;
pos += stl_portinfo(portp, totalport, pos);
}
}
}
*eof = 1;
stl_readdone:
*start = page;
return (pos - page);
}
/*****************************************************************************/
/*
* All board interrupts are vectored through here first. This code then
* calls off to the approrpriate board interrupt handlers.
*/
static irqreturn_t stl_intr(int irq, void *dev_id, struct pt_regs *regs)
{
stlbrd_t *brdp = (stlbrd_t *) dev_id;
#ifdef DEBUG
printk("stl_intr(brdp=%x,irq=%d,regs=%x)\n", (int) brdp, irq,
(int) regs);
#endif
return IRQ_RETVAL((* brdp->isr)(brdp));
}
/*****************************************************************************/
/*
* Interrupt service routine for EasyIO board types.
*/
static int stl_eiointr(stlbrd_t *brdp)
{
stlpanel_t *panelp;
unsigned int iobase;
int handled = 0;
spin_lock(&brd_lock);
panelp = brdp->panels[0];
iobase = panelp->iobase;
while (inb(brdp->iostatus) & EIO_INTRPEND) {
handled = 1;
(* panelp->isr)(panelp, iobase);
}
spin_unlock(&brd_lock);
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-AT board types.
*/
static int stl_echatintr(stlbrd_t *brdp)
{
stlpanel_t *panelp;
unsigned int ioaddr;
int bnknr;
int handled = 0;
outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
while (inb(brdp->iostatus) & ECH_INTRPEND) {
handled = 1;
for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
}
}
}
outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-MCA board types.
*/
static int stl_echmcaintr(stlbrd_t *brdp)
{
stlpanel_t *panelp;
unsigned int ioaddr;
int bnknr;
int handled = 0;
while (inb(brdp->iostatus) & ECH_INTRPEND) {
handled = 1;
for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
}
}
}
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-PCI board types.
*/
static int stl_echpciintr(stlbrd_t *brdp)
{
stlpanel_t *panelp;
unsigned int ioaddr;
int bnknr, recheck;
int handled = 0;
while (1) {
recheck = 0;
for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
outb(brdp->bnkpageaddr[bnknr], brdp->ioctrl);
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
recheck++;
handled = 1;
}
}
if (! recheck)
break;
}
return handled;
}
/*****************************************************************************/
/*
* Interrupt service routine for ECH-8/64-PCI board types.
*/
static int stl_echpci64intr(stlbrd_t *brdp)
{
stlpanel_t *panelp;
unsigned int ioaddr;
int bnknr;
int handled = 0;
while (inb(brdp->ioctrl) & 0x1) {
handled = 1;
for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
ioaddr = brdp->bnkstataddr[bnknr];
if (inb(ioaddr) & ECH_PNLINTRPEND) {
panelp = brdp->bnk2panel[bnknr];
(* panelp->isr)(panelp, (ioaddr & 0xfffc));
}
}
}
return handled;
}
/*****************************************************************************/
/*
* Service an off-level request for some channel.
*/
static void stl_offintr(void *private)
{
stlport_t *portp;
struct tty_struct *tty;
unsigned int oldsigs;
portp = private;
#ifdef DEBUG
printk("stl_offintr(portp=%x)\n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
lock_kernel();
if (test_bit(ASYI_TXLOW, &portp->istate)) {
tty_wakeup(tty);
}
if (test_bit(ASYI_DCDCHANGE, &portp->istate)) {
clear_bit(ASYI_DCDCHANGE, &portp->istate);
oldsigs = portp->sigs;
portp->sigs = stl_getsignals(portp);
if ((portp->sigs & TIOCM_CD) && ((oldsigs & TIOCM_CD) == 0))
wake_up_interruptible(&portp->open_wait);
if ((oldsigs & TIOCM_CD) && ((portp->sigs & TIOCM_CD) == 0)) {
if (portp->flags & ASYNC_CHECK_CD)
tty_hangup(tty); /* FIXME: module removal race here - AKPM */
}
}
unlock_kernel();
}
/*****************************************************************************/
/*
* Initialize all the ports on a panel.
*/
static int __init stl_initports(stlbrd_t *brdp, stlpanel_t *panelp)
{
stlport_t *portp;
int chipmask, i;
#ifdef DEBUG
printk("stl_initports(brdp=%x,panelp=%x)\n", (int) brdp, (int) panelp);
#endif
chipmask = stl_panelinit(brdp, panelp);
/*
* All UART's are initialized (if found!). Now go through and setup
* each ports data structures.
*/
for (i = 0; (i < panelp->nrports); i++) {
portp = kzalloc(sizeof(stlport_t), GFP_KERNEL);
if (!portp) {
printk("STALLION: failed to allocate memory "
"(size=%Zd)\n", sizeof(stlport_t));
break;
}
portp->magic = STL_PORTMAGIC;
portp->portnr = i;
portp->brdnr = panelp->brdnr;
portp->panelnr = panelp->panelnr;
portp->uartp = panelp->uartp;
portp->clk = brdp->clk;
portp->baud_base = STL_BAUDBASE;
portp->close_delay = STL_CLOSEDELAY;
portp->closing_wait = 30 * HZ;
INIT_WORK(&portp->tqueue, stl_offintr, portp);
init_waitqueue_head(&portp->open_wait);
init_waitqueue_head(&portp->close_wait);
portp->stats.brd = portp->brdnr;
portp->stats.panel = portp->panelnr;
portp->stats.port = portp->portnr;
panelp->ports[i] = portp;
stl_portinit(brdp, panelp, portp);
}
return(0);
}
/*****************************************************************************/
/*
* Try to find and initialize an EasyIO board.
*/
static inline int stl_initeio(stlbrd_t *brdp)
{
stlpanel_t *panelp;
unsigned int status;
char *name;
int rc;
#ifdef DEBUG
printk("stl_initeio(brdp=%x)\n", (int) brdp);
#endif
brdp->ioctrl = brdp->ioaddr1 + 1;
brdp->iostatus = brdp->ioaddr1 + 2;
status = inb(brdp->iostatus);
if ((status & EIO_IDBITMASK) == EIO_MK3)
brdp->ioctrl++;
/*
* Handle board specific stuff now. The real difference is PCI
* or not PCI.
*/
if (brdp->brdtype == BRD_EASYIOPCI) {
brdp->iosize1 = 0x80;
brdp->iosize2 = 0x80;
name = "serial(EIO-PCI)";
outb(0x41, (brdp->ioaddr2 + 0x4c));
} else {
brdp->iosize1 = 8;
name = "serial(EIO)";
if ((brdp->irq < 0) || (brdp->irq > 15) ||
(stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
printk("STALLION: invalid irq=%d for brd=%d\n",
brdp->irq, brdp->brdnr);
return(-EINVAL);
}
outb((stl_vecmap[brdp->irq] | EIO_0WS |
((brdp->irqtype) ? EIO_INTLEVEL : EIO_INTEDGE)),
brdp->ioctrl);
}
if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
"%x conflicts with another device\n", brdp->brdnr,
brdp->ioaddr1);
return(-EBUSY);
}
if (brdp->iosize2 > 0)
if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O "
"address %x conflicts with another device\n",
brdp->brdnr, brdp->ioaddr2);
printk(KERN_WARNING "STALLION: Warning, also "
"releasing board %d I/O address %x \n",
brdp->brdnr, brdp->ioaddr1);
release_region(brdp->ioaddr1, brdp->iosize1);
return(-EBUSY);
}
/*
* Everything looks OK, so let's go ahead and probe for the hardware.
*/
brdp->clk = CD1400_CLK;
brdp->isr = stl_eiointr;
switch (status & EIO_IDBITMASK) {
case EIO_8PORTM:
brdp->clk = CD1400_CLK8M;
/* fall thru */
case EIO_8PORTRS:
case EIO_8PORTDI:
brdp->nrports = 8;
break;
case EIO_4PORTRS:
brdp->nrports = 4;
break;
case EIO_MK3:
switch (status & EIO_BRDMASK) {
case ID_BRD4:
brdp->nrports = 4;
break;
case ID_BRD8:
brdp->nrports = 8;
break;
case ID_BRD16:
brdp->nrports = 16;
break;
default:
return(-ENODEV);
}
break;
default:
return(-ENODEV);
}
/*
* We have verified that the board is actually present, so now we
* can complete the setup.
*/
panelp = kzalloc(sizeof(stlpanel_t), GFP_KERNEL);
if (!panelp) {
printk(KERN_WARNING "STALLION: failed to allocate memory "
"(size=%Zd)\n", sizeof(stlpanel_t));
return -ENOMEM;
}
panelp->magic = STL_PANELMAGIC;
panelp->brdnr = brdp->brdnr;
panelp->panelnr = 0;
panelp->nrports = brdp->nrports;
panelp->iobase = brdp->ioaddr1;
panelp->hwid = status;
if ((status & EIO_IDBITMASK) == EIO_MK3) {
panelp->uartp = (void *) &stl_sc26198uart;
panelp->isr = stl_sc26198intr;
} else {
panelp->uartp = (void *) &stl_cd1400uart;
panelp->isr = stl_cd1400eiointr;
}
brdp->panels[0] = panelp;
brdp->nrpanels = 1;
brdp->state |= BRD_FOUND;
brdp->hwid = status;
if (request_irq(brdp->irq, stl_intr, SA_SHIRQ, name, brdp) != 0) {
printk("STALLION: failed to register interrupt "
"routine for %s irq=%d\n", name, brdp->irq);
rc = -ENODEV;
} else {
rc = 0;
}
return rc;
}
/*****************************************************************************/
/*
* Try to find an ECH board and initialize it. This code is capable of
* dealing with all types of ECH board.
*/
static inline int stl_initech(stlbrd_t *brdp)
{
stlpanel_t *panelp;
unsigned int status, nxtid, ioaddr, conflict;
int panelnr, banknr, i;
char *name;
#ifdef DEBUG
printk("stl_initech(brdp=%x)\n", (int) brdp);
#endif
status = 0;
conflict = 0;
/*
* Set up the initial board register contents for boards. This varies a
* bit between the different board types. So we need to handle each
* separately. Also do a check that the supplied IRQ is good.
*/
switch (brdp->brdtype) {
case BRD_ECH:
brdp->isr = stl_echatintr;
brdp->ioctrl = brdp->ioaddr1 + 1;
brdp->iostatus = brdp->ioaddr1 + 1;
status = inb(brdp->iostatus);
if ((status & ECH_IDBITMASK) != ECH_ID)
return(-ENODEV);
if ((brdp->irq < 0) || (brdp->irq > 15) ||
(stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
printk("STALLION: invalid irq=%d for brd=%d\n",
brdp->irq, brdp->brdnr);
return(-EINVAL);
}
status = ((brdp->ioaddr2 & ECH_ADDR2MASK) >> 1);
status |= (stl_vecmap[brdp->irq] << 1);
outb((status | ECH_BRDRESET), brdp->ioaddr1);
brdp->ioctrlval = ECH_INTENABLE |
((brdp->irqtype) ? ECH_INTLEVEL : ECH_INTEDGE);
for (i = 0; (i < 10); i++)
outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
brdp->iosize1 = 2;
brdp->iosize2 = 32;
name = "serial(EC8/32)";
outb(status, brdp->ioaddr1);
break;
case BRD_ECHMC:
brdp->isr = stl_echmcaintr;
brdp->ioctrl = brdp->ioaddr1 + 0x20;
brdp->iostatus = brdp->ioctrl;
status = inb(brdp->iostatus);
if ((status & ECH_IDBITMASK) != ECH_ID)
return(-ENODEV);
if ((brdp->irq < 0) || (brdp->irq > 15) ||
(stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
printk("STALLION: invalid irq=%d for brd=%d\n",
brdp->irq, brdp->brdnr);
return(-EINVAL);
}
outb(ECHMC_BRDRESET, brdp->ioctrl);
outb(ECHMC_INTENABLE, brdp->ioctrl);
brdp->iosize1 = 64;
name = "serial(EC8/32-MC)";
break;
case BRD_ECHPCI:
brdp->isr = stl_echpciintr;
brdp->ioctrl = brdp->ioaddr1 + 2;
brdp->iosize1 = 4;
brdp->iosize2 = 8;
name = "serial(EC8/32-PCI)";
break;
case BRD_ECH64PCI:
brdp->isr = stl_echpci64intr;
brdp->ioctrl = brdp->ioaddr2 + 0x40;
outb(0x43, (brdp->ioaddr1 + 0x4c));
brdp->iosize1 = 0x80;
brdp->iosize2 = 0x80;
name = "serial(EC8/64-PCI)";
break;
default:
printk("STALLION: unknown board type=%d\n", brdp->brdtype);
return(-EINVAL);
break;
}
/*
* Check boards for possible IO address conflicts and return fail status
* if an IO conflict found.
*/
if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
"%x conflicts with another device\n", brdp->brdnr,
brdp->ioaddr1);
return(-EBUSY);
}
if (brdp->iosize2 > 0)
if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
printk(KERN_WARNING "STALLION: Warning, board %d I/O "
"address %x conflicts with another device\n",
brdp->brdnr, brdp->ioaddr2);
printk(KERN_WARNING "STALLION: Warning, also "
"releasing board %d I/O address %x \n",
brdp->brdnr, brdp->ioaddr1);
release_region(brdp->ioaddr1, brdp->iosize1);
return(-EBUSY);
}
/*
* Scan through the secondary io address space looking for panels.
* As we find'em allocate and initialize panel structures for each.
*/
brdp->clk = CD1400_CLK;
brdp->hwid = status;
ioaddr = brdp->ioaddr2;
banknr = 0;
panelnr = 0;
nxtid = 0;
for (i = 0; (i < STL_MAXPANELS); i++) {
if (brdp->brdtype == BRD_ECHPCI) {
outb(nxtid, brdp->ioctrl);
ioaddr = brdp->ioaddr2;
}
status = inb(ioaddr + ECH_PNLSTATUS);
if ((status & ECH_PNLIDMASK) != nxtid)
break;
panelp = kzalloc(sizeof(stlpanel_t), GFP_KERNEL);
if (!panelp) {
printk("STALLION: failed to allocate memory "
"(size=%Zd)\n", sizeof(stlpanel_t));
break;
}
panelp->magic = STL_PANELMAGIC;
panelp->brdnr = brdp->brdnr;
panelp->panelnr = panelnr;
panelp->iobase = ioaddr;
panelp->pagenr = nxtid;
panelp->hwid = status;
brdp->bnk2panel[banknr] = panelp;
brdp->bnkpageaddr[banknr] = nxtid;
brdp->bnkstataddr[banknr++] = ioaddr + ECH_PNLSTATUS;
if (status & ECH_PNLXPID) {
panelp->uartp = (void *) &stl_sc26198uart;
panelp->isr = stl_sc26198intr;
if (status & ECH_PNL16PORT) {
panelp->nrports = 16;
brdp->bnk2panel[banknr] = panelp;
brdp->bnkpageaddr[banknr] = nxtid;
brdp->bnkstataddr[banknr++] = ioaddr + 4 +
ECH_PNLSTATUS;
} else {
panelp->nrports = 8;
}
} else {
panelp->uartp = (void *) &stl_cd1400uart;
panelp->isr = stl_cd1400echintr;
if (status & ECH_PNL16PORT) {
panelp->nrports = 16;
panelp->ackmask = 0x80;
if (brdp->brdtype != BRD_ECHPCI)
ioaddr += EREG_BANKSIZE;
brdp->bnk2panel[banknr] = panelp;
brdp->bnkpageaddr[banknr] = ++nxtid;
brdp->bnkstataddr[banknr++] = ioaddr +
ECH_PNLSTATUS;
} else {
panelp->nrports = 8;
panelp->ackmask = 0xc0;
}
}
nxtid++;
ioaddr += EREG_BANKSIZE;
brdp->nrports += panelp->nrports;
brdp->panels[panelnr++] = panelp;
if ((brdp->brdtype != BRD_ECHPCI) &&
(ioaddr >= (brdp->ioaddr2 + brdp->iosize2)))
break;
}
brdp->nrpanels = panelnr;
brdp->nrbnks = banknr;
if (brdp->brdtype == BRD_ECH)
outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
brdp->state |= BRD_FOUND;
if (request_irq(brdp->irq, stl_intr, SA_SHIRQ, name, brdp) != 0) {
printk("STALLION: failed to register interrupt "
"routine for %s irq=%d\n", name, brdp->irq);
i = -ENODEV;
} else {
i = 0;
}
return(i);
}
/*****************************************************************************/
/*
* Initialize and configure the specified board.
* Scan through all the boards in the configuration and see what we
* can find. Handle EIO and the ECH boards a little differently here
* since the initial search and setup is very different.
*/
static int __init stl_brdinit(stlbrd_t *brdp)
{
int i;
#ifdef DEBUG
printk("stl_brdinit(brdp=%x)\n", (int) brdp);
#endif
switch (brdp->brdtype) {
case BRD_EASYIO:
case BRD_EASYIOPCI:
stl_initeio(brdp);
break;
case BRD_ECH:
case BRD_ECHMC:
case BRD_ECHPCI:
case BRD_ECH64PCI:
stl_initech(brdp);
break;
default:
printk("STALLION: board=%d is unknown board type=%d\n",
brdp->brdnr, brdp->brdtype);
return(ENODEV);
}
stl_brds[brdp->brdnr] = brdp;
if ((brdp->state & BRD_FOUND) == 0) {
printk("STALLION: %s board not found, board=%d io=%x irq=%d\n",
stl_brdnames[brdp->brdtype], brdp->brdnr,
brdp->ioaddr1, brdp->irq);
return(ENODEV);
}
for (i = 0; (i < STL_MAXPANELS); i++)
if (brdp->panels[i] != (stlpanel_t *) NULL)
stl_initports(brdp, brdp->panels[i]);
printk("STALLION: %s found, board=%d io=%x irq=%d "
"nrpanels=%d nrports=%d\n", stl_brdnames[brdp->brdtype],
brdp->brdnr, brdp->ioaddr1, brdp->irq, brdp->nrpanels,
brdp->nrports);
return(0);
}
/*****************************************************************************/
/*
* Find the next available board number that is free.
*/
static inline int stl_getbrdnr(void)
{
int i;
for (i = 0; (i < STL_MAXBRDS); i++) {
if (stl_brds[i] == (stlbrd_t *) NULL) {
if (i >= stl_nrbrds)
stl_nrbrds = i + 1;
return(i);
}
}
return(-1);
}
/*****************************************************************************/
#ifdef CONFIG_PCI
/*
* We have a Stallion board. Allocate a board structure and
* initialize it. Read its IO and IRQ resources from PCI
* configuration space.
*/
static inline int stl_initpcibrd(int brdtype, struct pci_dev *devp)
{
stlbrd_t *brdp;
#ifdef DEBUG
printk("stl_initpcibrd(brdtype=%d,busnr=%x,devnr=%x)\n", brdtype,
devp->bus->number, devp->devfn);
#endif
if (pci_enable_device(devp))
return(-EIO);
if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
return(-ENOMEM);
if ((brdp->brdnr = stl_getbrdnr()) < 0) {
printk("STALLION: too many boards found, "
"maximum supported %d\n", STL_MAXBRDS);
return(0);
}
brdp->brdtype = brdtype;
/*
* Different Stallion boards use the BAR registers in different ways,
* so set up io addresses based on board type.
*/
#ifdef DEBUG
printk("%s(%d): BAR[]=%x,%x,%x,%x IRQ=%x\n", __FILE__, __LINE__,
pci_resource_start(devp, 0), pci_resource_start(devp, 1),
pci_resource_start(devp, 2), pci_resource_start(devp, 3), devp->irq);
#endif
/*
* We have all resources from the board, so let's setup the actual
* board structure now.
*/
switch (brdtype) {
case BRD_ECHPCI:
brdp->ioaddr2 = pci_resource_start(devp, 0);
brdp->ioaddr1 = pci_resource_start(devp, 1);
break;
case BRD_ECH64PCI:
brdp->ioaddr2 = pci_resource_start(devp, 2);
brdp->ioaddr1 = pci_resource_start(devp, 1);
break;
case BRD_EASYIOPCI:
brdp->ioaddr1 = pci_resource_start(devp, 2);
brdp->ioaddr2 = pci_resource_start(devp, 1);
break;
default:
printk("STALLION: unknown PCI board type=%d\n", brdtype);
break;
}
brdp->irq = devp->irq;
stl_brdinit(brdp);
return(0);
}
/*****************************************************************************/
/*
* Find all Stallion PCI boards that might be installed. Initialize each
* one as it is found.
*/
static inline int stl_findpcibrds(void)
{
struct pci_dev *dev = NULL;
int i, rc;
#ifdef DEBUG
printk("stl_findpcibrds()\n");
#endif
for (i = 0; (i < stl_nrpcibrds); i++)
while ((dev = pci_find_device(stl_pcibrds[i].vendid,
stl_pcibrds[i].devid, dev))) {
/*
* Found a device on the PCI bus that has our vendor and
* device ID. Need to check now that it is really us.
*/
if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
continue;
rc = stl_initpcibrd(stl_pcibrds[i].brdtype, dev);
if (rc)
return(rc);
}
return(0);
}
#endif
/*****************************************************************************/
/*
* Scan through all the boards in the configuration and see what we
* can find. Handle EIO and the ECH boards a little differently here
* since the initial search and setup is too different.
*/
static inline int stl_initbrds(void)
{
stlbrd_t *brdp;
stlconf_t *confp;
int i;
#ifdef DEBUG
printk("stl_initbrds()\n");
#endif
if (stl_nrbrds > STL_MAXBRDS) {
printk("STALLION: too many boards in configuration table, "
"truncating to %d\n", STL_MAXBRDS);
stl_nrbrds = STL_MAXBRDS;
}
/*
* Firstly scan the list of static boards configured. Allocate
* resources and initialize the boards as found.
*/
for (i = 0; (i < stl_nrbrds); i++) {
confp = &stl_brdconf[i];
stl_parsebrd(confp, stl_brdsp[i]);
if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
return(-ENOMEM);
brdp->brdnr = i;
brdp->brdtype = confp->brdtype;
brdp->ioaddr1 = confp->ioaddr1;
brdp->ioaddr2 = confp->ioaddr2;
brdp->irq = confp->irq;
brdp->irqtype = confp->irqtype;
stl_brdinit(brdp);
}
/*
* Find any dynamically supported boards. That is via module load
* line options or auto-detected on the PCI bus.
*/
stl_argbrds();
#ifdef CONFIG_PCI
stl_findpcibrds();
#endif
return(0);
}
/*****************************************************************************/
/*
* Return the board stats structure to user app.
*/
static int stl_getbrdstats(combrd_t __user *bp)
{
stlbrd_t *brdp;
stlpanel_t *panelp;
int i;
if (copy_from_user(&stl_brdstats, bp, sizeof(combrd_t)))
return -EFAULT;
if (stl_brdstats.brd >= STL_MAXBRDS)
return(-ENODEV);
brdp = stl_brds[stl_brdstats.brd];
if (brdp == (stlbrd_t *) NULL)
return(-ENODEV);
memset(&stl_brdstats, 0, sizeof(combrd_t));
stl_brdstats.brd = brdp->brdnr;
stl_brdstats.type = brdp->brdtype;
stl_brdstats.hwid = brdp->hwid;
stl_brdstats.state = brdp->state;
stl_brdstats.ioaddr = brdp->ioaddr1;
stl_brdstats.ioaddr2 = brdp->ioaddr2;
stl_brdstats.irq = brdp->irq;
stl_brdstats.nrpanels = brdp->nrpanels;
stl_brdstats.nrports = brdp->nrports;
for (i = 0; (i < brdp->nrpanels); i++) {
panelp = brdp->panels[i];
stl_brdstats.panels[i].panel = i;
stl_brdstats.panels[i].hwid = panelp->hwid;
stl_brdstats.panels[i].nrports = panelp->nrports;
}
return copy_to_user(bp, &stl_brdstats, sizeof(combrd_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Resolve the referenced port number into a port struct pointer.
*/
static stlport_t *stl_getport(int brdnr, int panelnr, int portnr)
{
stlbrd_t *brdp;
stlpanel_t *panelp;
if ((brdnr < 0) || (brdnr >= STL_MAXBRDS))
return((stlport_t *) NULL);
brdp = stl_brds[brdnr];
if (brdp == (stlbrd_t *) NULL)
return((stlport_t *) NULL);
if ((panelnr < 0) || (panelnr >= brdp->nrpanels))
return((stlport_t *) NULL);
panelp = brdp->panels[panelnr];
if (panelp == (stlpanel_t *) NULL)
return((stlport_t *) NULL);
if ((portnr < 0) || (portnr >= panelp->nrports))
return((stlport_t *) NULL);
return(panelp->ports[portnr]);
}
/*****************************************************************************/
/*
* Return the port stats structure to user app. A NULL port struct
* pointer passed in means that we need to find out from the app
* what port to get stats for (used through board control device).
*/
static int stl_getportstats(stlport_t *portp, comstats_t __user *cp)
{
unsigned char *head, *tail;
unsigned long flags;
if (!portp) {
if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
return -EFAULT;
portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
stl_comstats.port);
if (portp == (stlport_t *) NULL)
return(-ENODEV);
}
portp->stats.state = portp->istate;
portp->stats.flags = portp->flags;
portp->stats.hwid = portp->hwid;
portp->stats.ttystate = 0;
portp->stats.cflags = 0;
portp->stats.iflags = 0;
portp->stats.oflags = 0;
portp->stats.lflags = 0;
portp->stats.rxbuffered = 0;
spin_lock_irqsave(&stallion_lock, flags);
if (portp->tty != (struct tty_struct *) NULL) {
if (portp->tty->driver_data == portp) {
portp->stats.ttystate = portp->tty->flags;
/* No longer available as a statistic */
portp->stats.rxbuffered = 1; /*portp->tty->flip.count; */
if (portp->tty->termios != (struct termios *) NULL) {
portp->stats.cflags = portp->tty->termios->c_cflag;
portp->stats.iflags = portp->tty->termios->c_iflag;
portp->stats.oflags = portp->tty->termios->c_oflag;
portp->stats.lflags = portp->tty->termios->c_lflag;
}
}
}
spin_unlock_irqrestore(&stallion_lock, flags);
head = portp->tx.head;
tail = portp->tx.tail;
portp->stats.txbuffered = ((head >= tail) ? (head - tail) :
(STL_TXBUFSIZE - (tail - head)));
portp->stats.signals = (unsigned long) stl_getsignals(portp);
return copy_to_user(cp, &portp->stats,
sizeof(comstats_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Clear the port stats structure. We also return it zeroed out...
*/
static int stl_clrportstats(stlport_t *portp, comstats_t __user *cp)
{
if (!portp) {
if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
return -EFAULT;
portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
stl_comstats.port);
if (portp == (stlport_t *) NULL)
return(-ENODEV);
}
memset(&portp->stats, 0, sizeof(comstats_t));
portp->stats.brd = portp->brdnr;
portp->stats.panel = portp->panelnr;
portp->stats.port = portp->portnr;
return copy_to_user(cp, &portp->stats,
sizeof(comstats_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Return the entire driver ports structure to a user app.
*/
static int stl_getportstruct(stlport_t __user *arg)
{
stlport_t *portp;
if (copy_from_user(&stl_dummyport, arg, sizeof(stlport_t)))
return -EFAULT;
portp = stl_getport(stl_dummyport.brdnr, stl_dummyport.panelnr,
stl_dummyport.portnr);
if (!portp)
return -ENODEV;
return copy_to_user(arg, portp, sizeof(stlport_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* Return the entire driver board structure to a user app.
*/
static int stl_getbrdstruct(stlbrd_t __user *arg)
{
stlbrd_t *brdp;
if (copy_from_user(&stl_dummybrd, arg, sizeof(stlbrd_t)))
return -EFAULT;
if ((stl_dummybrd.brdnr < 0) || (stl_dummybrd.brdnr >= STL_MAXBRDS))
return -ENODEV;
brdp = stl_brds[stl_dummybrd.brdnr];
if (!brdp)
return(-ENODEV);
return copy_to_user(arg, brdp, sizeof(stlbrd_t)) ? -EFAULT : 0;
}
/*****************************************************************************/
/*
* The "staliomem" device is also required to do some special operations
* on the board and/or ports. In this driver it is mostly used for stats
* collection.
*/
static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
{
int brdnr, rc;
void __user *argp = (void __user *)arg;
#ifdef DEBUG
printk("stl_memioctl(ip=%x,fp=%x,cmd=%x,arg=%x)\n", (int) ip,
(int) fp, cmd, (int) arg);
#endif
brdnr = iminor(ip);
if (brdnr >= STL_MAXBRDS)
return(-ENODEV);
rc = 0;
switch (cmd) {
case COM_GETPORTSTATS:
rc = stl_getportstats(NULL, argp);
break;
case COM_CLRPORTSTATS:
rc = stl_clrportstats(NULL, argp);
break;
case COM_GETBRDSTATS:
rc = stl_getbrdstats(argp);
break;
case COM_READPORT:
rc = stl_getportstruct(argp);
break;
case COM_READBOARD:
rc = stl_getbrdstruct(argp);
break;
default:
rc = -ENOIOCTLCMD;
break;
}
return(rc);
}
static struct tty_operations stl_ops = {
.open = stl_open,
.close = stl_close,
.write = stl_write,
.put_char = stl_putchar,
.flush_chars = stl_flushchars,
.write_room = stl_writeroom,
.chars_in_buffer = stl_charsinbuffer,
.ioctl = stl_ioctl,
.set_termios = stl_settermios,
.throttle = stl_throttle,
.unthrottle = stl_unthrottle,
.stop = stl_stop,
.start = stl_start,
.hangup = stl_hangup,
.flush_buffer = stl_flushbuffer,
.break_ctl = stl_breakctl,
.wait_until_sent = stl_waituntilsent,
.send_xchar = stl_sendxchar,
.read_proc = stl_readproc,
.tiocmget = stl_tiocmget,
.tiocmset = stl_tiocmset,
};
/*****************************************************************************/
static int __init stl_init(void)
{
int i;
printk(KERN_INFO "%s: version %s\n", stl_drvtitle, stl_drvversion);
spin_lock_init(&stallion_lock);
spin_lock_init(&brd_lock);
stl_initbrds();
stl_serial = alloc_tty_driver(STL_MAXBRDS * STL_MAXPORTS);
if (!stl_serial)
return -1;
/*
* Set up a character driver for per board stuff. This is mainly used
* to do stats ioctls on the ports.
*/
if (register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stl_fsiomem))
printk("STALLION: failed to register serial board device\n");
stallion_class = class_create(THIS_MODULE, "staliomem");
for (i = 0; i < 4; i++)
class_device_create(stallion_class, NULL,
MKDEV(STL_SIOMEMMAJOR, i), NULL,
"staliomem%d", i);
stl_serial->owner = THIS_MODULE;
stl_serial->driver_name = stl_drvname;
stl_serial->name = "ttyE";
stl_serial->major = STL_SERIALMAJOR;
stl_serial->minor_start = 0;
stl_serial->type = TTY_DRIVER_TYPE_SERIAL;
stl_serial->subtype = SERIAL_TYPE_NORMAL;
stl_serial->init_termios = stl_deftermios;
stl_serial->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(stl_serial, &stl_ops);
if (tty_register_driver(stl_serial)) {
put_tty_driver(stl_serial);
printk("STALLION: failed to register serial driver\n");
return -1;
}
return 0;
}
/*****************************************************************************/
/* CD1400 HARDWARE FUNCTIONS */
/*****************************************************************************/
/*
* These functions get/set/update the registers of the cd1400 UARTs.
* Access to the cd1400 registers is via an address/data io port pair.
* (Maybe should make this inline...)
*/
static int stl_cd1400getreg(stlport_t *portp, int regnr)
{
outb((regnr + portp->uartaddr), portp->ioaddr);
return inb(portp->ioaddr + EREG_DATA);
}
static void stl_cd1400setreg(stlport_t *portp, int regnr, int value)
{
outb((regnr + portp->uartaddr), portp->ioaddr);
outb(value, portp->ioaddr + EREG_DATA);
}
static int stl_cd1400updatereg(stlport_t *portp, int regnr, int value)
{
outb((regnr + portp->uartaddr), portp->ioaddr);
if (inb(portp->ioaddr + EREG_DATA) != value) {
outb(value, portp->ioaddr + EREG_DATA);
return 1;
}
return 0;
}
/*****************************************************************************/
/*
* Inbitialize the UARTs in a panel. We don't care what sort of board
* these ports are on - since the port io registers are almost
* identical when dealing with ports.
*/
static int stl_cd1400panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
{
unsigned int gfrcr;
int chipmask, i, j;
int nrchips, uartaddr, ioaddr;
unsigned long flags;
#ifdef DEBUG
printk("stl_panelinit(brdp=%x,panelp=%x)\n", (int) brdp, (int) panelp);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(panelp->brdnr, panelp->pagenr);
/*
* Check that each chip is present and started up OK.
*/
chipmask = 0;
nrchips = panelp->nrports / CD1400_PORTS;
for (i = 0; (i < nrchips); i++) {
if (brdp->brdtype == BRD_ECHPCI) {
outb((panelp->pagenr + (i >> 1)), brdp->ioctrl);
ioaddr = panelp->iobase;
} else {
ioaddr = panelp->iobase + (EREG_BANKSIZE * (i >> 1));
}
uartaddr = (i & 0x01) ? 0x080 : 0;
outb((GFRCR + uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
outb((CCR + uartaddr), ioaddr);
outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
outb((GFRCR + uartaddr), ioaddr);
for (j = 0; (j < CCR_MAXWAIT); j++) {
if ((gfrcr = inb(ioaddr + EREG_DATA)) != 0)
break;
}
if ((j >= CCR_MAXWAIT) || (gfrcr < 0x40) || (gfrcr > 0x60)) {
printk("STALLION: cd1400 not responding, "
"brd=%d panel=%d chip=%d\n",
panelp->brdnr, panelp->panelnr, i);
continue;
}
chipmask |= (0x1 << i);
outb((PPR + uartaddr), ioaddr);
outb(PPR_SCALAR, (ioaddr + EREG_DATA));
}
BRDDISABLE(panelp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
return chipmask;
}
/*****************************************************************************/
/*
* Initialize hardware specific port registers.
*/
static void stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
{
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400portinit(brdp=%x,panelp=%x,portp=%x)\n",
(int) brdp, (int) panelp, (int) portp);
#endif
if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
(portp == (stlport_t *) NULL))
return;
spin_lock_irqsave(&brd_lock, flags);
portp->ioaddr = panelp->iobase + (((brdp->brdtype == BRD_ECHPCI) ||
(portp->portnr < 8)) ? 0 : EREG_BANKSIZE);
portp->uartaddr = (portp->portnr & 0x04) << 5;
portp->pagenr = panelp->pagenr + (portp->portnr >> 3);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, LIVR, (portp->portnr << 3));
portp->hwid = stl_cd1400getreg(portp, GFRCR);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Wait for the command register to be ready. We will poll this,
* since it won't usually take too long to be ready.
*/
static void stl_cd1400ccrwait(stlport_t *portp)
{
int i;
for (i = 0; (i < CCR_MAXWAIT); i++) {
if (stl_cd1400getreg(portp, CCR) == 0) {
return;
}
}
printk("STALLION: cd1400 not responding, port=%d panel=%d brd=%d\n",
portp->portnr, portp->panelnr, portp->brdnr);
}
/*****************************************************************************/
/*
* Set up the cd1400 registers for a port based on the termios port
* settings.
*/
static void stl_cd1400setport(stlport_t *portp, struct termios *tiosp)
{
stlbrd_t *brdp;
unsigned long flags;
unsigned int clkdiv, baudrate;
unsigned char cor1, cor2, cor3;
unsigned char cor4, cor5, ccr;
unsigned char srer, sreron, sreroff;
unsigned char mcor1, mcor2, rtpr;
unsigned char clk, div;
cor1 = 0;
cor2 = 0;
cor3 = 0;
cor4 = 0;
cor5 = 0;
ccr = 0;
rtpr = 0;
clk = 0;
div = 0;
mcor1 = 0;
mcor2 = 0;
sreron = 0;
sreroff = 0;
brdp = stl_brds[portp->brdnr];
if (brdp == (stlbrd_t *) NULL)
return;
/*
* Set up the RX char ignore mask with those RX error types we
* can ignore. We can get the cd1400 to help us out a little here,
* it will ignore parity errors and breaks for us.
*/
portp->rxignoremsk = 0;
if (tiosp->c_iflag & IGNPAR) {
portp->rxignoremsk |= (ST_PARITY | ST_FRAMING | ST_OVERRUN);
cor1 |= COR1_PARIGNORE;
}
if (tiosp->c_iflag & IGNBRK) {
portp->rxignoremsk |= ST_BREAK;
cor4 |= COR4_IGNBRK;
}
portp->rxmarkmsk = ST_OVERRUN;
if (tiosp->c_iflag & (INPCK | PARMRK))
portp->rxmarkmsk |= (ST_PARITY | ST_FRAMING);
if (tiosp->c_iflag & BRKINT)
portp->rxmarkmsk |= ST_BREAK;
/*
* Go through the char size, parity and stop bits and set all the
* option register appropriately.
*/
switch (tiosp->c_cflag & CSIZE) {
case CS5:
cor1 |= COR1_CHL5;
break;
case CS6:
cor1 |= COR1_CHL6;
break;
case CS7:
cor1 |= COR1_CHL7;
break;
default:
cor1 |= COR1_CHL8;
break;
}
if (tiosp->c_cflag & CSTOPB)
cor1 |= COR1_STOP2;
else
cor1 |= COR1_STOP1;
if (tiosp->c_cflag & PARENB) {
if (tiosp->c_cflag & PARODD)
cor1 |= (COR1_PARENB | COR1_PARODD);
else
cor1 |= (COR1_PARENB | COR1_PAREVEN);
} else {
cor1 |= COR1_PARNONE;
}
/*
* Set the RX FIFO threshold at 6 chars. This gives a bit of breathing
* space for hardware flow control and the like. This should be set to
* VMIN. Also here we will set the RX data timeout to 10ms - this should
* really be based on VTIME.
*/
cor3 |= FIFO_RXTHRESHOLD;
rtpr = 2;
/*
* Calculate the baud rate timers. For now we will just assume that
* the input and output baud are the same. Could have used a baud
* table here, but this way we can generate virtually any baud rate
* we like!
*/
baudrate = tiosp->c_cflag & CBAUD;
if (baudrate & CBAUDEX) {
baudrate &= ~CBAUDEX;
if ((baudrate < 1) || (baudrate > 4))
tiosp->c_cflag &= ~CBAUDEX;
else
baudrate += 15;
}
baudrate = stl_baudrates[baudrate];
if ((tiosp->c_cflag & CBAUD) == B38400) {
if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baudrate = 57600;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baudrate = 115200;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baudrate = 230400;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baudrate = 460800;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
baudrate = (portp->baud_base / portp->custom_divisor);
}
if (baudrate > STL_CD1400MAXBAUD)
baudrate = STL_CD1400MAXBAUD;
if (baudrate > 0) {
for (clk = 0; (clk < CD1400_NUMCLKS); clk++) {
clkdiv = ((portp->clk / stl_cd1400clkdivs[clk]) / baudrate);
if (clkdiv < 0x100)
break;
}
div = (unsigned char) clkdiv;
}
/*
* Check what form of modem signaling is required and set it up.
*/
if ((tiosp->c_cflag & CLOCAL) == 0) {
mcor1 |= MCOR1_DCD;
mcor2 |= MCOR2_DCD;
sreron |= SRER_MODEM;
portp->flags |= ASYNC_CHECK_CD;
} else {
portp->flags &= ~ASYNC_CHECK_CD;
}
/*
* Setup cd1400 enhanced modes if we can. In particular we want to
* handle as much of the flow control as possible automatically. As
* well as saving a few CPU cycles it will also greatly improve flow
* control reliability.
*/
if (tiosp->c_iflag & IXON) {
cor2 |= COR2_TXIBE;
cor3 |= COR3_SCD12;
if (tiosp->c_iflag & IXANY)
cor2 |= COR2_IXM;
}
if (tiosp->c_cflag & CRTSCTS) {
cor2 |= COR2_CTSAE;
mcor1 |= FIFO_RTSTHRESHOLD;
}
/*
* All cd1400 register values calculated so go through and set
* them all up.
*/
#ifdef DEBUG
printk("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
portp->portnr, portp->panelnr, portp->brdnr);
printk(" cor1=%x cor2=%x cor3=%x cor4=%x cor5=%x\n",
cor1, cor2, cor3, cor4, cor5);
printk(" mcor1=%x mcor2=%x rtpr=%x sreron=%x sreroff=%x\n",
mcor1, mcor2, rtpr, sreron, sreroff);
printk(" tcor=%x tbpr=%x rcor=%x rbpr=%x\n", clk, div, clk, div);
printk(" schr1=%x schr2=%x schr3=%x schr4=%x\n",
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x3));
srer = stl_cd1400getreg(portp, SRER);
stl_cd1400setreg(portp, SRER, 0);
if (stl_cd1400updatereg(portp, COR1, cor1))
ccr = 1;
if (stl_cd1400updatereg(portp, COR2, cor2))
ccr = 1;
if (stl_cd1400updatereg(portp, COR3, cor3))
ccr = 1;
if (ccr) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_CORCHANGE);
}
stl_cd1400setreg(portp, COR4, cor4);
stl_cd1400setreg(portp, COR5, cor5);
stl_cd1400setreg(portp, MCOR1, mcor1);
stl_cd1400setreg(portp, MCOR2, mcor2);
if (baudrate > 0) {
stl_cd1400setreg(portp, TCOR, clk);
stl_cd1400setreg(portp, TBPR, div);
stl_cd1400setreg(portp, RCOR, clk);
stl_cd1400setreg(portp, RBPR, div);
}
stl_cd1400setreg(portp, SCHR1, tiosp->c_cc[VSTART]);
stl_cd1400setreg(portp, SCHR2, tiosp->c_cc[VSTOP]);
stl_cd1400setreg(portp, SCHR3, tiosp->c_cc[VSTART]);
stl_cd1400setreg(portp, SCHR4, tiosp->c_cc[VSTOP]);
stl_cd1400setreg(portp, RTPR, rtpr);
mcor1 = stl_cd1400getreg(portp, MSVR1);
if (mcor1 & MSVR1_DCD)
portp->sigs |= TIOCM_CD;
else
portp->sigs &= ~TIOCM_CD;
stl_cd1400setreg(portp, SRER, ((srer & ~sreroff) | sreron));
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Set the state of the DTR and RTS signals.
*/
static void stl_cd1400setsignals(stlport_t *portp, int dtr, int rts)
{
unsigned char msvr1, msvr2;
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400setsignals(portp=%x,dtr=%d,rts=%d)\n",
(int) portp, dtr, rts);
#endif
msvr1 = 0;
msvr2 = 0;
if (dtr > 0)
msvr1 = MSVR1_DTR;
if (rts > 0)
msvr2 = MSVR2_RTS;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
if (rts >= 0)
stl_cd1400setreg(portp, MSVR2, msvr2);
if (dtr >= 0)
stl_cd1400setreg(portp, MSVR1, msvr1);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Return the state of the signals.
*/
static int stl_cd1400getsignals(stlport_t *portp)
{
unsigned char msvr1, msvr2;
unsigned long flags;
int sigs;
#ifdef DEBUG
printk("stl_cd1400getsignals(portp=%x)\n", (int) portp);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
msvr1 = stl_cd1400getreg(portp, MSVR1);
msvr2 = stl_cd1400getreg(portp, MSVR2);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
sigs = 0;
sigs |= (msvr1 & MSVR1_DCD) ? TIOCM_CD : 0;
sigs |= (msvr1 & MSVR1_CTS) ? TIOCM_CTS : 0;
sigs |= (msvr1 & MSVR1_DTR) ? TIOCM_DTR : 0;
sigs |= (msvr2 & MSVR2_RTS) ? TIOCM_RTS : 0;
#if 0
sigs |= (msvr1 & MSVR1_RI) ? TIOCM_RI : 0;
sigs |= (msvr1 & MSVR1_DSR) ? TIOCM_DSR : 0;
#else
sigs |= TIOCM_DSR;
#endif
return sigs;
}
/*****************************************************************************/
/*
* Enable/Disable the Transmitter and/or Receiver.
*/
static void stl_cd1400enablerxtx(stlport_t *portp, int rx, int tx)
{
unsigned char ccr;
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400enablerxtx(portp=%x,rx=%d,tx=%d)\n",
(int) portp, rx, tx);
#endif
ccr = 0;
if (tx == 0)
ccr |= CCR_TXDISABLE;
else if (tx > 0)
ccr |= CCR_TXENABLE;
if (rx == 0)
ccr |= CCR_RXDISABLE;
else if (rx > 0)
ccr |= CCR_RXENABLE;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, ccr);
stl_cd1400ccrwait(portp);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Start/stop the Transmitter and/or Receiver.
*/
static void stl_cd1400startrxtx(stlport_t *portp, int rx, int tx)
{
unsigned char sreron, sreroff;
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400startrxtx(portp=%x,rx=%d,tx=%d)\n",
(int) portp, rx, tx);
#endif
sreron = 0;
sreroff = 0;
if (tx == 0)
sreroff |= (SRER_TXDATA | SRER_TXEMPTY);
else if (tx == 1)
sreron |= SRER_TXDATA;
else if (tx >= 2)
sreron |= SRER_TXEMPTY;
if (rx == 0)
sreroff |= SRER_RXDATA;
else if (rx > 0)
sreron |= SRER_RXDATA;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, SRER,
((stl_cd1400getreg(portp, SRER) & ~sreroff) | sreron));
BRDDISABLE(portp->brdnr);
if (tx > 0)
set_bit(ASYI_TXBUSY, &portp->istate);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Disable all interrupts from this port.
*/
static void stl_cd1400disableintrs(stlport_t *portp)
{
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400disableintrs(portp=%x)\n", (int) portp);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, SRER, 0);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
static void stl_cd1400sendbreak(stlport_t *portp, int len)
{
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400sendbreak(portp=%x,len=%d)\n", (int) portp, len);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400setreg(portp, SRER,
((stl_cd1400getreg(portp, SRER) & ~SRER_TXDATA) |
SRER_TXEMPTY));
BRDDISABLE(portp->brdnr);
portp->brklen = len;
if (len == 1)
portp->stats.txbreaks++;
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Take flow control actions...
*/
static void stl_cd1400flowctrl(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400flowctrl(portp=%x,state=%x)\n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
if (state) {
if (tty->termios->c_iflag & IXOFF) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
portp->stats.rxxon++;
stl_cd1400ccrwait(portp);
}
/*
* Question: should we return RTS to what it was before? It may
* have been set by an ioctl... Suppose not, since if you have
* hardware flow control set then it is pretty silly to go and
* set the RTS line by hand.
*/
if (tty->termios->c_cflag & CRTSCTS) {
stl_cd1400setreg(portp, MCOR1,
(stl_cd1400getreg(portp, MCOR1) |
FIFO_RTSTHRESHOLD));
stl_cd1400setreg(portp, MSVR2, MSVR2_RTS);
portp->stats.rxrtson++;
}
} else {
if (tty->termios->c_iflag & IXOFF) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
portp->stats.rxxoff++;
stl_cd1400ccrwait(portp);
}
if (tty->termios->c_cflag & CRTSCTS) {
stl_cd1400setreg(portp, MCOR1,
(stl_cd1400getreg(portp, MCOR1) & 0xf0));
stl_cd1400setreg(portp, MSVR2, 0);
portp->stats.rxrtsoff++;
}
}
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Send a flow control character...
*/
static void stl_cd1400sendflow(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400sendflow(portp=%x,state=%x)\n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
if (state) {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
portp->stats.rxxon++;
stl_cd1400ccrwait(portp);
} else {
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
portp->stats.rxxoff++;
stl_cd1400ccrwait(portp);
}
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
static void stl_cd1400flush(stlport_t *portp)
{
unsigned long flags;
#ifdef DEBUG
printk("stl_cd1400flush(portp=%x)\n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
stl_cd1400ccrwait(portp);
stl_cd1400setreg(portp, CCR, CCR_TXFLUSHFIFO);
stl_cd1400ccrwait(portp);
portp->tx.tail = portp->tx.head;
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Return the current state of data flow on this port. This is only
* really interresting when determining if data has fully completed
* transmission or not... This is easy for the cd1400, it accurately
* maintains the busy port flag.
*/
static int stl_cd1400datastate(stlport_t *portp)
{
#ifdef DEBUG
printk("stl_cd1400datastate(portp=%x)\n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return 0;
return test_bit(ASYI_TXBUSY, &portp->istate) ? 1 : 0;
}
/*****************************************************************************/
/*
* Interrupt service routine for cd1400 EasyIO boards.
*/
static void stl_cd1400eiointr(stlpanel_t *panelp, unsigned int iobase)
{
unsigned char svrtype;
#ifdef DEBUG
printk("stl_cd1400eiointr(panelp=%x,iobase=%x)\n",
(int) panelp, iobase);
#endif
spin_lock(&brd_lock);
outb(SVRR, iobase);
svrtype = inb(iobase + EREG_DATA);
if (panelp->nrports > 4) {
outb((SVRR + 0x80), iobase);
svrtype |= inb(iobase + EREG_DATA);
}
if (svrtype & SVRR_RX)
stl_cd1400rxisr(panelp, iobase);
else if (svrtype & SVRR_TX)
stl_cd1400txisr(panelp, iobase);
else if (svrtype & SVRR_MDM)
stl_cd1400mdmisr(panelp, iobase);
spin_unlock(&brd_lock);
}
/*****************************************************************************/
/*
* Interrupt service routine for cd1400 panels.
*/
static void stl_cd1400echintr(stlpanel_t *panelp, unsigned int iobase)
{
unsigned char svrtype;
#ifdef DEBUG
printk("stl_cd1400echintr(panelp=%x,iobase=%x)\n", (int) panelp,
iobase);
#endif
outb(SVRR, iobase);
svrtype = inb(iobase + EREG_DATA);
outb((SVRR + 0x80), iobase);
svrtype |= inb(iobase + EREG_DATA);
if (svrtype & SVRR_RX)
stl_cd1400rxisr(panelp, iobase);
else if (svrtype & SVRR_TX)
stl_cd1400txisr(panelp, iobase);
else if (svrtype & SVRR_MDM)
stl_cd1400mdmisr(panelp, iobase);
}
/*****************************************************************************/
/*
* Unfortunately we need to handle breaks in the TX data stream, since
* this is the only way to generate them on the cd1400.
*/
static inline int stl_cd1400breakisr(stlport_t *portp, int ioaddr)
{
if (portp->brklen == 1) {
outb((COR2 + portp->uartaddr), ioaddr);
outb((inb(ioaddr + EREG_DATA) | COR2_ETC),
(ioaddr + EREG_DATA));
outb((TDR + portp->uartaddr), ioaddr);
outb(ETC_CMD, (ioaddr + EREG_DATA));
outb(ETC_STARTBREAK, (ioaddr + EREG_DATA));
outb((SRER + portp->uartaddr), ioaddr);
outb((inb(ioaddr + EREG_DATA) & ~(SRER_TXDATA | SRER_TXEMPTY)),
(ioaddr + EREG_DATA));
return 1;
} else if (portp->brklen > 1) {
outb((TDR + portp->uartaddr), ioaddr);
outb(ETC_CMD, (ioaddr + EREG_DATA));
outb(ETC_STOPBREAK, (ioaddr + EREG_DATA));
portp->brklen = -1;
return 1;
} else {
outb((COR2 + portp->uartaddr), ioaddr);
outb((inb(ioaddr + EREG_DATA) & ~COR2_ETC),
(ioaddr + EREG_DATA));
portp->brklen = 0;
}
return 0;
}
/*****************************************************************************/
/*
* Transmit interrupt handler. This has gotta be fast! Handling TX
* chars is pretty simple, stuff as many as possible from the TX buffer
* into the cd1400 FIFO. Must also handle TX breaks here, since they
* are embedded as commands in the data stream. Oh no, had to use a goto!
* This could be optimized more, will do when I get time...
* In practice it is possible that interrupts are enabled but that the
* port has been hung up. Need to handle not having any TX buffer here,
* this is done by using the side effect that head and tail will also
* be NULL if the buffer has been freed.
*/
static void stl_cd1400txisr(stlpanel_t *panelp, int ioaddr)
{
stlport_t *portp;
int len, stlen;
char *head, *tail;
unsigned char ioack, srer;
#ifdef DEBUG
printk("stl_cd1400txisr(panelp=%x,ioaddr=%x)\n", (int) panelp, ioaddr);
#endif
ioack = inb(ioaddr + EREG_TXACK);
if (((ioack & panelp->ackmask) != 0) ||
((ioack & ACK_TYPMASK) != ACK_TYPTX)) {
printk("STALLION: bad TX interrupt ack value=%x\n", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
/*
* Unfortunately we need to handle breaks in the data stream, since
* this is the only way to generate them on the cd1400. Do it now if
* a break is to be sent.
*/
if (portp->brklen != 0)
if (stl_cd1400breakisr(portp, ioaddr))
goto stl_txalldone;
head = portp->tx.head;
tail = portp->tx.tail;
len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
if ((len == 0) || ((len < STL_TXBUFLOW) &&
(test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
set_bit(ASYI_TXLOW, &portp->istate);
schedule_work(&portp->tqueue);
}
if (len == 0) {
outb((SRER + portp->uartaddr), ioaddr);
srer = inb(ioaddr + EREG_DATA);
if (srer & SRER_TXDATA) {
srer = (srer & ~SRER_TXDATA) | SRER_TXEMPTY;
} else {
srer &= ~(SRER_TXDATA | SRER_TXEMPTY);
clear_bit(ASYI_TXBUSY, &portp->istate);
}
outb(srer, (ioaddr + EREG_DATA));
} else {
len = MIN(len, CD1400_TXFIFOSIZE);
portp->stats.txtotal += len;
stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
outb((TDR + portp->uartaddr), ioaddr);
outsb((ioaddr + EREG_DATA), tail, stlen);
len -= stlen;
tail += stlen;
if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
tail = portp->tx.buf;
if (len > 0) {
outsb((ioaddr + EREG_DATA), tail, len);
tail += len;
}
portp->tx.tail = tail;
}
stl_txalldone:
outb((EOSRR + portp->uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
}
/*****************************************************************************/
/*
* Receive character interrupt handler. Determine if we have good chars
* or bad chars and then process appropriately. Good chars are easy
* just shove the lot into the RX buffer and set all status byte to 0.
* If a bad RX char then process as required. This routine needs to be
* fast! In practice it is possible that we get an interrupt on a port
* that is closed. This can happen on hangups - since they completely
* shutdown a port not in user context. Need to handle this case.
*/
static void stl_cd1400rxisr(stlpanel_t *panelp, int ioaddr)
{
stlport_t *portp;
struct tty_struct *tty;
unsigned int ioack, len, buflen;
unsigned char status;
char ch;
#ifdef DEBUG
printk("stl_cd1400rxisr(panelp=%x,ioaddr=%x)\n", (int) panelp, ioaddr);
#endif
ioack = inb(ioaddr + EREG_RXACK);
if ((ioack & panelp->ackmask) != 0) {
printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
tty = portp->tty;
if ((ioack & ACK_TYPMASK) == ACK_TYPRXGOOD) {
outb((RDCR + portp->uartaddr), ioaddr);
len = inb(ioaddr + EREG_DATA);
if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
len = MIN(len, sizeof(stl_unwanted));
outb((RDSR + portp->uartaddr), ioaddr);
insb((ioaddr + EREG_DATA), &stl_unwanted[0], len);
portp->stats.rxlost += len;
portp->stats.rxtotal += len;
} else {
len = MIN(len, buflen);
if (len > 0) {
unsigned char *ptr;
outb((RDSR + portp->uartaddr), ioaddr);
tty_prepare_flip_string(tty, &ptr, len);
insb((ioaddr + EREG_DATA), ptr, len);
tty_schedule_flip(tty);
portp->stats.rxtotal += len;
}
}
} else if ((ioack & ACK_TYPMASK) == ACK_TYPRXBAD) {
outb((RDSR + portp->uartaddr), ioaddr);
status = inb(ioaddr + EREG_DATA);
ch = inb(ioaddr + EREG_DATA);
if (status & ST_PARITY)
portp->stats.rxparity++;
if (status & ST_FRAMING)
portp->stats.rxframing++;
if (status & ST_OVERRUN)
portp->stats.rxoverrun++;
if (status & ST_BREAK)
portp->stats.rxbreaks++;
if (status & ST_SCHARMASK) {
if ((status & ST_SCHARMASK) == ST_SCHAR1)
portp->stats.txxon++;
if ((status & ST_SCHARMASK) == ST_SCHAR2)
portp->stats.txxoff++;
goto stl_rxalldone;
}
if (tty != NULL && (portp->rxignoremsk & status) == 0) {
if (portp->rxmarkmsk & status) {
if (status & ST_BREAK) {
status = TTY_BREAK;
if (portp->flags & ASYNC_SAK) {
do_SAK(tty);
BRDENABLE(portp->brdnr, portp->pagenr);
}
} else if (status & ST_PARITY) {
status = TTY_PARITY;
} else if (status & ST_FRAMING) {
status = TTY_FRAME;
} else if(status & ST_OVERRUN) {
status = TTY_OVERRUN;
} else {
status = 0;
}
} else {
status = 0;
}
tty_insert_flip_char(tty, ch, status);
tty_schedule_flip(tty);
}
} else {
printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
return;
}
stl_rxalldone:
outb((EOSRR + portp->uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
}
/*****************************************************************************/
/*
* Modem interrupt handler. The is called when the modem signal line
* (DCD) has changed state. Leave most of the work to the off-level
* processing routine.
*/
static void stl_cd1400mdmisr(stlpanel_t *panelp, int ioaddr)
{
stlport_t *portp;
unsigned int ioack;
unsigned char misr;
#ifdef DEBUG
printk("stl_cd1400mdmisr(panelp=%x)\n", (int) panelp);
#endif
ioack = inb(ioaddr + EREG_MDACK);
if (((ioack & panelp->ackmask) != 0) ||
((ioack & ACK_TYPMASK) != ACK_TYPMDM)) {
printk("STALLION: bad MODEM interrupt ack value=%x\n", ioack);
return;
}
portp = panelp->ports[(ioack >> 3)];
outb((MISR + portp->uartaddr), ioaddr);
misr = inb(ioaddr + EREG_DATA);
if (misr & MISR_DCD) {
set_bit(ASYI_DCDCHANGE, &portp->istate);
schedule_work(&portp->tqueue);
portp->stats.modem++;
}
outb((EOSRR + portp->uartaddr), ioaddr);
outb(0, (ioaddr + EREG_DATA));
}
/*****************************************************************************/
/* SC26198 HARDWARE FUNCTIONS */
/*****************************************************************************/
/*
* These functions get/set/update the registers of the sc26198 UARTs.
* Access to the sc26198 registers is via an address/data io port pair.
* (Maybe should make this inline...)
*/
static int stl_sc26198getreg(stlport_t *portp, int regnr)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
return inb(portp->ioaddr + XP_DATA);
}
static void stl_sc26198setreg(stlport_t *portp, int regnr, int value)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
outb(value, (portp->ioaddr + XP_DATA));
}
static int stl_sc26198updatereg(stlport_t *portp, int regnr, int value)
{
outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
if (inb(portp->ioaddr + XP_DATA) != value) {
outb(value, (portp->ioaddr + XP_DATA));
return 1;
}
return 0;
}
/*****************************************************************************/
/*
* Functions to get and set the sc26198 global registers.
*/
static int stl_sc26198getglobreg(stlport_t *portp, int regnr)
{
outb(regnr, (portp->ioaddr + XP_ADDR));
return inb(portp->ioaddr + XP_DATA);
}
#if 0
static void stl_sc26198setglobreg(stlport_t *portp, int regnr, int value)
{
outb(regnr, (portp->ioaddr + XP_ADDR));
outb(value, (portp->ioaddr + XP_DATA));
}
#endif
/*****************************************************************************/
/*
* Inbitialize the UARTs in a panel. We don't care what sort of board
* these ports are on - since the port io registers are almost
* identical when dealing with ports.
*/
static int stl_sc26198panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
{
int chipmask, i;
int nrchips, ioaddr;
#ifdef DEBUG
printk("stl_sc26198panelinit(brdp=%x,panelp=%x)\n",
(int) brdp, (int) panelp);
#endif
BRDENABLE(panelp->brdnr, panelp->pagenr);
/*
* Check that each chip is present and started up OK.
*/
chipmask = 0;
nrchips = (panelp->nrports + 4) / SC26198_PORTS;
if (brdp->brdtype == BRD_ECHPCI)
outb(panelp->pagenr, brdp->ioctrl);
for (i = 0; (i < nrchips); i++) {
ioaddr = panelp->iobase + (i * 4);
outb(SCCR, (ioaddr + XP_ADDR));
outb(CR_RESETALL, (ioaddr + XP_DATA));
outb(TSTR, (ioaddr + XP_ADDR));
if (inb(ioaddr + XP_DATA) != 0) {
printk("STALLION: sc26198 not responding, "
"brd=%d panel=%d chip=%d\n",
panelp->brdnr, panelp->panelnr, i);
continue;
}
chipmask |= (0x1 << i);
outb(GCCR, (ioaddr + XP_ADDR));
outb(GCCR_IVRTYPCHANACK, (ioaddr + XP_DATA));
outb(WDTRCR, (ioaddr + XP_ADDR));
outb(0xff, (ioaddr + XP_DATA));
}
BRDDISABLE(panelp->brdnr);
return chipmask;
}
/*****************************************************************************/
/*
* Initialize hardware specific port registers.
*/
static void stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
{
#ifdef DEBUG
printk("stl_sc26198portinit(brdp=%x,panelp=%x,portp=%x)\n",
(int) brdp, (int) panelp, (int) portp);
#endif
if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
(portp == (stlport_t *) NULL))
return;
portp->ioaddr = panelp->iobase + ((portp->portnr < 8) ? 0 : 4);
portp->uartaddr = (portp->portnr & 0x07) << 4;
portp->pagenr = panelp->pagenr;
portp->hwid = 0x1;
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IOPCR, IOPCR_SETSIGS);
BRDDISABLE(portp->brdnr);
}
/*****************************************************************************/
/*
* Set up the sc26198 registers for a port based on the termios port
* settings.
*/
static void stl_sc26198setport(stlport_t *portp, struct termios *tiosp)
{
stlbrd_t *brdp;
unsigned long flags;
unsigned int baudrate;
unsigned char mr0, mr1, mr2, clk;
unsigned char imron, imroff, iopr, ipr;
mr0 = 0;
mr1 = 0;
mr2 = 0;
clk = 0;
iopr = 0;
imron = 0;
imroff = 0;
brdp = stl_brds[portp->brdnr];
if (brdp == (stlbrd_t *) NULL)
return;
/*
* Set up the RX char ignore mask with those RX error types we
* can ignore.
*/
portp->rxignoremsk = 0;
if (tiosp->c_iflag & IGNPAR)
portp->rxignoremsk |= (SR_RXPARITY | SR_RXFRAMING |
SR_RXOVERRUN);
if (tiosp->c_iflag & IGNBRK)
portp->rxignoremsk |= SR_RXBREAK;
portp->rxmarkmsk = SR_RXOVERRUN;
if (tiosp->c_iflag & (INPCK | PARMRK))
portp->rxmarkmsk |= (SR_RXPARITY | SR_RXFRAMING);
if (tiosp->c_iflag & BRKINT)
portp->rxmarkmsk |= SR_RXBREAK;
/*
* Go through the char size, parity and stop bits and set all the
* option register appropriately.
*/
switch (tiosp->c_cflag & CSIZE) {
case CS5:
mr1 |= MR1_CS5;
break;
case CS6:
mr1 |= MR1_CS6;
break;
case CS7:
mr1 |= MR1_CS7;
break;
default:
mr1 |= MR1_CS8;
break;
}
if (tiosp->c_cflag & CSTOPB)
mr2 |= MR2_STOP2;
else
mr2 |= MR2_STOP1;
if (tiosp->c_cflag & PARENB) {
if (tiosp->c_cflag & PARODD)
mr1 |= (MR1_PARENB | MR1_PARODD);
else
mr1 |= (MR1_PARENB | MR1_PAREVEN);
} else {
mr1 |= MR1_PARNONE;
}
mr1 |= MR1_ERRBLOCK;
/*
* Set the RX FIFO threshold at 8 chars. This gives a bit of breathing
* space for hardware flow control and the like. This should be set to
* VMIN.
*/
mr2 |= MR2_RXFIFOHALF;
/*
* Calculate the baud rate timers. For now we will just assume that
* the input and output baud are the same. The sc26198 has a fixed
* baud rate table, so only discrete baud rates possible.
*/
baudrate = tiosp->c_cflag & CBAUD;
if (baudrate & CBAUDEX) {
baudrate &= ~CBAUDEX;
if ((baudrate < 1) || (baudrate > 4))
tiosp->c_cflag &= ~CBAUDEX;
else
baudrate += 15;
}
baudrate = stl_baudrates[baudrate];
if ((tiosp->c_cflag & CBAUD) == B38400) {
if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baudrate = 57600;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baudrate = 115200;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baudrate = 230400;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baudrate = 460800;
else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
baudrate = (portp->baud_base / portp->custom_divisor);
}
if (baudrate > STL_SC26198MAXBAUD)
baudrate = STL_SC26198MAXBAUD;
if (baudrate > 0) {
for (clk = 0; (clk < SC26198_NRBAUDS); clk++) {
if (baudrate <= sc26198_baudtable[clk])
break;
}
}
/*
* Check what form of modem signaling is required and set it up.
*/
if (tiosp->c_cflag & CLOCAL) {
portp->flags &= ~ASYNC_CHECK_CD;
} else {
iopr |= IOPR_DCDCOS;
imron |= IR_IOPORT;
portp->flags |= ASYNC_CHECK_CD;
}
/*
* Setup sc26198 enhanced modes if we can. In particular we want to
* handle as much of the flow control as possible automatically. As
* well as saving a few CPU cycles it will also greatly improve flow
* control reliability.
*/
if (tiosp->c_iflag & IXON) {
mr0 |= MR0_SWFTX | MR0_SWFT;
imron |= IR_XONXOFF;
} else {
imroff |= IR_XONXOFF;
}
if (tiosp->c_iflag & IXOFF)
mr0 |= MR0_SWFRX;
if (tiosp->c_cflag & CRTSCTS) {
mr2 |= MR2_AUTOCTS;
mr1 |= MR1_AUTORTS;
}
/*
* All sc26198 register values calculated so go through and set
* them all up.
*/
#ifdef DEBUG
printk("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
portp->portnr, portp->panelnr, portp->brdnr);
printk(" mr0=%x mr1=%x mr2=%x clk=%x\n", mr0, mr1, mr2, clk);
printk(" iopr=%x imron=%x imroff=%x\n", iopr, imron, imroff);
printk(" schr1=%x schr2=%x schr3=%x schr4=%x\n",
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IMR, 0);
stl_sc26198updatereg(portp, MR0, mr0);
stl_sc26198updatereg(portp, MR1, mr1);
stl_sc26198setreg(portp, SCCR, CR_RXERRBLOCK);
stl_sc26198updatereg(portp, MR2, mr2);
stl_sc26198updatereg(portp, IOPIOR,
((stl_sc26198getreg(portp, IOPIOR) & ~IPR_CHANGEMASK) | iopr));
if (baudrate > 0) {
stl_sc26198setreg(portp, TXCSR, clk);
stl_sc26198setreg(portp, RXCSR, clk);
}
stl_sc26198setreg(portp, XONCR, tiosp->c_cc[VSTART]);
stl_sc26198setreg(portp, XOFFCR, tiosp->c_cc[VSTOP]);
ipr = stl_sc26198getreg(portp, IPR);
if (ipr & IPR_DCD)
portp->sigs &= ~TIOCM_CD;
else
portp->sigs |= TIOCM_CD;
portp->imr = (portp->imr & ~imroff) | imron;
stl_sc26198setreg(portp, IMR, portp->imr);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Set the state of the DTR and RTS signals.
*/
static void stl_sc26198setsignals(stlport_t *portp, int dtr, int rts)
{
unsigned char iopioron, iopioroff;
unsigned long flags;
#ifdef DEBUG
printk("stl_sc26198setsignals(portp=%x,dtr=%d,rts=%d)\n",
(int) portp, dtr, rts);
#endif
iopioron = 0;
iopioroff = 0;
if (dtr == 0)
iopioroff |= IPR_DTR;
else if (dtr > 0)
iopioron |= IPR_DTR;
if (rts == 0)
iopioroff |= IPR_RTS;
else if (rts > 0)
iopioron |= IPR_RTS;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IOPIOR,
((stl_sc26198getreg(portp, IOPIOR) & ~iopioroff) | iopioron));
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Return the state of the signals.
*/
static int stl_sc26198getsignals(stlport_t *portp)
{
unsigned char ipr;
unsigned long flags;
int sigs;
#ifdef DEBUG
printk("stl_sc26198getsignals(portp=%x)\n", (int) portp);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
ipr = stl_sc26198getreg(portp, IPR);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
sigs = 0;
sigs |= (ipr & IPR_DCD) ? 0 : TIOCM_CD;
sigs |= (ipr & IPR_CTS) ? 0 : TIOCM_CTS;
sigs |= (ipr & IPR_DTR) ? 0: TIOCM_DTR;
sigs |= (ipr & IPR_RTS) ? 0: TIOCM_RTS;
sigs |= TIOCM_DSR;
return sigs;
}
/*****************************************************************************/
/*
* Enable/Disable the Transmitter and/or Receiver.
*/
static void stl_sc26198enablerxtx(stlport_t *portp, int rx, int tx)
{
unsigned char ccr;
unsigned long flags;
#ifdef DEBUG
printk("stl_sc26198enablerxtx(portp=%x,rx=%d,tx=%d)\n",
(int) portp, rx, tx);
#endif
ccr = portp->crenable;
if (tx == 0)
ccr &= ~CR_TXENABLE;
else if (tx > 0)
ccr |= CR_TXENABLE;
if (rx == 0)
ccr &= ~CR_RXENABLE;
else if (rx > 0)
ccr |= CR_RXENABLE;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, SCCR, ccr);
BRDDISABLE(portp->brdnr);
portp->crenable = ccr;
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Start/stop the Transmitter and/or Receiver.
*/
static void stl_sc26198startrxtx(stlport_t *portp, int rx, int tx)
{
unsigned char imr;
unsigned long flags;
#ifdef DEBUG
printk("stl_sc26198startrxtx(portp=%x,rx=%d,tx=%d)\n",
(int) portp, rx, tx);
#endif
imr = portp->imr;
if (tx == 0)
imr &= ~IR_TXRDY;
else if (tx == 1)
imr |= IR_TXRDY;
if (rx == 0)
imr &= ~(IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG);
else if (rx > 0)
imr |= IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, IMR, imr);
BRDDISABLE(portp->brdnr);
portp->imr = imr;
if (tx > 0)
set_bit(ASYI_TXBUSY, &portp->istate);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Disable all interrupts from this port.
*/
static void stl_sc26198disableintrs(stlport_t *portp)
{
unsigned long flags;
#ifdef DEBUG
printk("stl_sc26198disableintrs(portp=%x)\n", (int) portp);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
portp->imr = 0;
stl_sc26198setreg(portp, IMR, 0);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
static void stl_sc26198sendbreak(stlport_t *portp, int len)
{
unsigned long flags;
#ifdef DEBUG
printk("stl_sc26198sendbreak(portp=%x,len=%d)\n", (int) portp, len);
#endif
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
if (len == 1) {
stl_sc26198setreg(portp, SCCR, CR_TXSTARTBREAK);
portp->stats.txbreaks++;
} else {
stl_sc26198setreg(portp, SCCR, CR_TXSTOPBREAK);
}
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Take flow control actions...
*/
static void stl_sc26198flowctrl(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
unsigned char mr0;
#ifdef DEBUG
printk("stl_sc26198flowctrl(portp=%x,state=%x)\n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
if (state) {
if (tty->termios->c_iflag & IXOFF) {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
mr0 |= MR0_SWFRX;
portp->stats.rxxon++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
}
/*
* Question: should we return RTS to what it was before? It may
* have been set by an ioctl... Suppose not, since if you have
* hardware flow control set then it is pretty silly to go and
* set the RTS line by hand.
*/
if (tty->termios->c_cflag & CRTSCTS) {
stl_sc26198setreg(portp, MR1,
(stl_sc26198getreg(portp, MR1) | MR1_AUTORTS));
stl_sc26198setreg(portp, IOPIOR,
(stl_sc26198getreg(portp, IOPIOR) | IOPR_RTS));
portp->stats.rxrtson++;
}
} else {
if (tty->termios->c_iflag & IXOFF) {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
mr0 &= ~MR0_SWFRX;
portp->stats.rxxoff++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
}
if (tty->termios->c_cflag & CRTSCTS) {
stl_sc26198setreg(portp, MR1,
(stl_sc26198getreg(portp, MR1) & ~MR1_AUTORTS));
stl_sc26198setreg(portp, IOPIOR,
(stl_sc26198getreg(portp, IOPIOR) & ~IOPR_RTS));
portp->stats.rxrtsoff++;
}
}
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Send a flow control character.
*/
static void stl_sc26198sendflow(stlport_t *portp, int state)
{
struct tty_struct *tty;
unsigned long flags;
unsigned char mr0;
#ifdef DEBUG
printk("stl_sc26198sendflow(portp=%x,state=%x)\n", (int) portp, state);
#endif
if (portp == (stlport_t *) NULL)
return;
tty = portp->tty;
if (tty == (struct tty_struct *) NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
if (state) {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
mr0 |= MR0_SWFRX;
portp->stats.rxxon++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
} else {
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
mr0 &= ~MR0_SWFRX;
portp->stats.rxxoff++;
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
}
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
static void stl_sc26198flush(stlport_t *portp)
{
unsigned long flags;
#ifdef DEBUG
printk("stl_sc26198flush(portp=%x)\n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
stl_sc26198setreg(portp, SCCR, CR_TXRESET);
stl_sc26198setreg(portp, SCCR, portp->crenable);
BRDDISABLE(portp->brdnr);
portp->tx.tail = portp->tx.head;
spin_unlock_irqrestore(&brd_lock, flags);
}
/*****************************************************************************/
/*
* Return the current state of data flow on this port. This is only
* really interresting when determining if data has fully completed
* transmission or not... The sc26198 interrupt scheme cannot
* determine when all data has actually drained, so we need to
* check the port statusy register to be sure.
*/
static int stl_sc26198datastate(stlport_t *portp)
{
unsigned long flags;
unsigned char sr;
#ifdef DEBUG
printk("stl_sc26198datastate(portp=%x)\n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return 0;
if (test_bit(ASYI_TXBUSY, &portp->istate))
return 1;
spin_lock_irqsave(&brd_lock, flags);
BRDENABLE(portp->brdnr, portp->pagenr);
sr = stl_sc26198getreg(portp, SR);
BRDDISABLE(portp->brdnr);
spin_unlock_irqrestore(&brd_lock, flags);
return (sr & SR_TXEMPTY) ? 0 : 1;
}
/*****************************************************************************/
/*
* Delay for a small amount of time, to give the sc26198 a chance
* to process a command...
*/
static void stl_sc26198wait(stlport_t *portp)
{
int i;
#ifdef DEBUG
printk("stl_sc26198wait(portp=%x)\n", (int) portp);
#endif
if (portp == (stlport_t *) NULL)
return;
for (i = 0; (i < 20); i++)
stl_sc26198getglobreg(portp, TSTR);
}
/*****************************************************************************/
/*
* If we are TX flow controlled and in IXANY mode then we may
* need to unflow control here. We gotta do this because of the
* automatic flow control modes of the sc26198.
*/
static inline void stl_sc26198txunflow(stlport_t *portp, struct tty_struct *tty)
{
unsigned char mr0;
mr0 = stl_sc26198getreg(portp, MR0);
stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
stl_sc26198setreg(portp, SCCR, CR_HOSTXON);
stl_sc26198wait(portp);
stl_sc26198setreg(portp, MR0, mr0);
clear_bit(ASYI_TXFLOWED, &portp->istate);
}
/*****************************************************************************/
/*
* Interrupt service routine for sc26198 panels.
*/
static void stl_sc26198intr(stlpanel_t *panelp, unsigned int iobase)
{
stlport_t *portp;
unsigned int iack;
spin_lock(&brd_lock);
/*
* Work around bug in sc26198 chip... Cannot have A6 address
* line of UART high, else iack will be returned as 0.
*/
outb(0, (iobase + 1));
iack = inb(iobase + XP_IACK);
portp = panelp->ports[(iack & IVR_CHANMASK) + ((iobase & 0x4) << 1)];
if (iack & IVR_RXDATA)
stl_sc26198rxisr(portp, iack);
else if (iack & IVR_TXDATA)
stl_sc26198txisr(portp);
else
stl_sc26198otherisr(portp, iack);
spin_unlock(&brd_lock);
}
/*****************************************************************************/
/*
* Transmit interrupt handler. This has gotta be fast! Handling TX
* chars is pretty simple, stuff as many as possible from the TX buffer
* into the sc26198 FIFO.
* In practice it is possible that interrupts are enabled but that the
* port has been hung up. Need to handle not having any TX buffer here,
* this is done by using the side effect that head and tail will also
* be NULL if the buffer has been freed.
*/
static void stl_sc26198txisr(stlport_t *portp)
{
unsigned int ioaddr;
unsigned char mr0;
int len, stlen;
char *head, *tail;
#ifdef DEBUG
printk("stl_sc26198txisr(portp=%x)\n", (int) portp);
#endif
ioaddr = portp->ioaddr;
head = portp->tx.head;
tail = portp->tx.tail;
len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
if ((len == 0) || ((len < STL_TXBUFLOW) &&
(test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
set_bit(ASYI_TXLOW, &portp->istate);
schedule_work(&portp->tqueue);
}
if (len == 0) {
outb((MR0 | portp->uartaddr), (ioaddr + XP_ADDR));
mr0 = inb(ioaddr + XP_DATA);
if ((mr0 & MR0_TXMASK) == MR0_TXEMPTY) {
portp->imr &= ~IR_TXRDY;
outb((IMR | portp->uartaddr), (ioaddr + XP_ADDR));
outb(portp->imr, (ioaddr + XP_DATA));
clear_bit(ASYI_TXBUSY, &portp->istate);
} else {
mr0 |= ((mr0 & ~MR0_TXMASK) | MR0_TXEMPTY);
outb(mr0, (ioaddr + XP_DATA));
}
} else {
len = MIN(len, SC26198_TXFIFOSIZE);
portp->stats.txtotal += len;
stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
outb(GTXFIFO, (ioaddr + XP_ADDR));
outsb((ioaddr + XP_DATA), tail, stlen);
len -= stlen;
tail += stlen;
if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
tail = portp->tx.buf;
if (len > 0) {
outsb((ioaddr + XP_DATA), tail, len);
tail += len;
}
portp->tx.tail = tail;
}
}
/*****************************************************************************/
/*
* Receive character interrupt handler. Determine if we have good chars
* or bad chars and then process appropriately. Good chars are easy
* just shove the lot into the RX buffer and set all status byte to 0.
* If a bad RX char then process as required. This routine needs to be
* fast! In practice it is possible that we get an interrupt on a port
* that is closed. This can happen on hangups - since they completely
* shutdown a port not in user context. Need to handle this case.
*/
static void stl_sc26198rxisr(stlport_t *portp, unsigned int iack)
{
struct tty_struct *tty;
unsigned int len, buflen, ioaddr;
#ifdef DEBUG
printk("stl_sc26198rxisr(portp=%x,iack=%x)\n", (int) portp, iack);
#endif
tty = portp->tty;
ioaddr = portp->ioaddr;
outb(GIBCR, (ioaddr + XP_ADDR));
len = inb(ioaddr + XP_DATA) + 1;
if ((iack & IVR_TYPEMASK) == IVR_RXDATA) {
if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
len = MIN(len, sizeof(stl_unwanted));
outb(GRXFIFO, (ioaddr + XP_ADDR));
insb((ioaddr + XP_DATA), &stl_unwanted[0], len);
portp->stats.rxlost += len;
portp->stats.rxtotal += len;
} else {
len = MIN(len, buflen);
if (len > 0) {
unsigned char *ptr;
outb(GRXFIFO, (ioaddr + XP_ADDR));
tty_prepare_flip_string(tty, &ptr, len);
insb((ioaddr + XP_DATA), ptr, len);
tty_schedule_flip(tty);
portp->stats.rxtotal += len;
}
}
} else {
stl_sc26198rxbadchars(portp);
}
/*
* If we are TX flow controlled and in IXANY mode then we may need
* to unflow control here. We gotta do this because of the automatic
* flow control modes of the sc26198.
*/
if (test_bit(ASYI_TXFLOWED, &portp->istate)) {
if ((tty != (struct tty_struct *) NULL) &&
(tty->termios != (struct termios *) NULL) &&
(tty->termios->c_iflag & IXANY)) {
stl_sc26198txunflow(portp, tty);
}
}
}
/*****************************************************************************/
/*
* Process an RX bad character.
*/
static inline void stl_sc26198rxbadch(stlport_t *portp, unsigned char status, char ch)
{
struct tty_struct *tty;
unsigned int ioaddr;
tty = portp->tty;
ioaddr = portp->ioaddr;
if (status & SR_RXPARITY)
portp->stats.rxparity++;
if (status & SR_RXFRAMING)
portp->stats.rxframing++;
if (status & SR_RXOVERRUN)
portp->stats.rxoverrun++;
if (status & SR_RXBREAK)
portp->stats.rxbreaks++;
if ((tty != (struct tty_struct *) NULL) &&
((portp->rxignoremsk & status) == 0)) {
if (portp->rxmarkmsk & status) {
if (status & SR_RXBREAK) {
status = TTY_BREAK;
if (portp->flags & ASYNC_SAK) {
do_SAK(tty);
BRDENABLE(portp->brdnr, portp->pagenr);
}
} else if (status & SR_RXPARITY) {
status = TTY_PARITY;
} else if (status & SR_RXFRAMING) {
status = TTY_FRAME;
} else if(status & SR_RXOVERRUN) {
status = TTY_OVERRUN;
} else {
status = 0;
}
} else {
status = 0;
}
tty_insert_flip_char(tty, ch, status);
tty_schedule_flip(tty);
if (status == 0)
portp->stats.rxtotal++;
}
}
/*****************************************************************************/
/*
* Process all characters in the RX FIFO of the UART. Check all char
* status bytes as well, and process as required. We need to check
* all bytes in the FIFO, in case some more enter the FIFO while we
* are here. To get the exact character error type we need to switch
* into CHAR error mode (that is why we need to make sure we empty
* the FIFO).
*/
static void stl_sc26198rxbadchars(stlport_t *portp)
{
unsigned char status, mr1;
char ch;
/*
* To get the precise error type for each character we must switch
* back into CHAR error mode.
*/
mr1 = stl_sc26198getreg(portp, MR1);
stl_sc26198setreg(portp, MR1, (mr1 & ~MR1_ERRBLOCK));
while ((status = stl_sc26198getreg(portp, SR)) & SR_RXRDY) {
stl_sc26198setreg(portp, SCCR, CR_CLEARRXERR);
ch = stl_sc26198getreg(portp, RXFIFO);
stl_sc26198rxbadch(portp, status, ch);
}
/*
* To get correct interrupt class we must switch back into BLOCK
* error mode.
*/
stl_sc26198setreg(portp, MR1, mr1);
}
/*****************************************************************************/
/*
* Other interrupt handler. This includes modem signals, flow
* control actions, etc. Most stuff is left to off-level interrupt
* processing time.
*/
static void stl_sc26198otherisr(stlport_t *portp, unsigned int iack)
{
unsigned char cir, ipr, xisr;
#ifdef DEBUG
printk("stl_sc26198otherisr(portp=%x,iack=%x)\n", (int) portp, iack);
#endif
cir = stl_sc26198getglobreg(portp, CIR);
switch (cir & CIR_SUBTYPEMASK) {
case CIR_SUBCOS:
ipr = stl_sc26198getreg(portp, IPR);
if (ipr & IPR_DCDCHANGE) {
set_bit(ASYI_DCDCHANGE, &portp->istate);
schedule_work(&portp->tqueue);
portp->stats.modem++;
}
break;
case CIR_SUBXONXOFF:
xisr = stl_sc26198getreg(portp, XISR);
if (xisr & XISR_RXXONGOT) {
set_bit(ASYI_TXFLOWED, &portp->istate);
portp->stats.txxoff++;
}
if (xisr & XISR_RXXOFFGOT) {
clear_bit(ASYI_TXFLOWED, &portp->istate);
portp->stats.txxon++;
}
break;
case CIR_SUBBREAK:
stl_sc26198setreg(portp, SCCR, CR_BREAKRESET);
stl_sc26198rxbadchars(portp);
break;
default:
break;
}
}
/*****************************************************************************/
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