282 lines
6.6 KiB
C
282 lines
6.6 KiB
C
/*
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backpack.c (c) 2001 Micro Solutions Inc.
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Released under the terms of the GNU General Public license
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backpack.c is a low-level protocol driver for the Micro Solutions
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"BACKPACK" parallel port IDE adapter
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(Works on Series 6 drives)
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Written by: Ken Hahn (linux-dev@micro-solutions.com)
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Clive Turvey (linux-dev@micro-solutions.com)
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*/
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/*
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This is Ken's linux wrapper for the PPC library
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Version 1.0.0 is the backpack driver for which source is not available
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Version 2.0.0 is the first to have source released
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Version 2.0.1 is the "Cox-ified" source code
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Version 2.0.2 - fixed version string usage, and made ppc functions static
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*/
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/* PARAMETERS */
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static int verbose; /* set this to 1 to see debugging messages and whatnot */
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#define BACKPACK_VERSION "2.0.2"
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#if defined(CONFIG_PARPORT_MODULE)||defined(CONFIG_PARPORT)
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#include <linux/parport.h>
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#endif
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#include "ppc6lnx.c"
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#include "paride.h"
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#define PPCSTRUCT(pi) ((Interface *)(pi->private))
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/****************************************************************/
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/*
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ATAPI CDROM DRIVE REGISTERS
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*/
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#define ATAPI_DATA 0 /* data port */
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#define ATAPI_ERROR 1 /* error register (read) */
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#define ATAPI_FEATURES 1 /* feature register (write) */
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#define ATAPI_INT_REASON 2 /* interrupt reason register */
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#define ATAPI_COUNT_LOW 4 /* byte count register (low) */
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#define ATAPI_COUNT_HIGH 5 /* byte count register (high) */
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#define ATAPI_DRIVE_SEL 6 /* drive select register */
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#define ATAPI_STATUS 7 /* status port (read) */
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#define ATAPI_COMMAND 7 /* command port (write) */
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#define ATAPI_ALT_STATUS 0x0e /* alternate status reg (read) */
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#define ATAPI_DEVICE_CONTROL 0x0e /* device control (write) */
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/****************************************************************/
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static int bpck6_read_regr(PIA *pi, int cont, int reg)
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{
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unsigned int out;
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/* check for bad settings */
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if (reg<0 || reg>7 || cont<0 || cont>2)
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{
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return(-1);
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}
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out=ppc6_rd_port(PPCSTRUCT(pi),cont?reg|8:reg);
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return(out);
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}
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static void bpck6_write_regr(PIA *pi, int cont, int reg, int val)
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{
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/* check for bad settings */
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if (reg>=0 && reg<=7 && cont>=0 && cont<=1)
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{
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ppc6_wr_port(PPCSTRUCT(pi),cont?reg|8:reg,(u8)val);
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}
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}
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static void bpck6_write_block( PIA *pi, char * buf, int len )
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{
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ppc6_wr_port16_blk(PPCSTRUCT(pi),ATAPI_DATA,buf,(u32)len>>1);
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}
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static void bpck6_read_block( PIA *pi, char * buf, int len )
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{
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ppc6_rd_port16_blk(PPCSTRUCT(pi),ATAPI_DATA,buf,(u32)len>>1);
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}
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static void bpck6_connect ( PIA *pi )
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{
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if(verbose)
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{
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printk(KERN_DEBUG "connect\n");
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}
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if(pi->mode >=2)
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{
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PPCSTRUCT(pi)->mode=4+pi->mode-2;
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}
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else if(pi->mode==1)
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{
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PPCSTRUCT(pi)->mode=3;
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}
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else
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{
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PPCSTRUCT(pi)->mode=1;
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}
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ppc6_open(PPCSTRUCT(pi));
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ppc6_wr_extout(PPCSTRUCT(pi),0x3);
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}
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static void bpck6_disconnect ( PIA *pi )
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{
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if(verbose)
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{
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printk("disconnect\n");
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}
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ppc6_wr_extout(PPCSTRUCT(pi),0x0);
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ppc6_close(PPCSTRUCT(pi));
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}
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static int bpck6_test_port ( PIA *pi ) /* check for 8-bit port */
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{
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if(verbose)
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{
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printk(KERN_DEBUG "PARPORT indicates modes=%x for lp=0x%lx\n",
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((struct pardevice*)(pi->pardev))->port->modes,
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((struct pardevice *)(pi->pardev))->port->base);
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}
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/*copy over duplicate stuff.. initialize state info*/
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PPCSTRUCT(pi)->ppc_id=pi->unit;
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PPCSTRUCT(pi)->lpt_addr=pi->port;
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#ifdef CONFIG_PARPORT_PC_MODULE
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#define CONFIG_PARPORT_PC
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#endif
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#ifdef CONFIG_PARPORT_PC
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/* look at the parport device to see if what modes we can use */
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if(((struct pardevice *)(pi->pardev))->port->modes &
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(PARPORT_MODE_EPP)
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)
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{
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return 5; /* Can do EPP*/
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}
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else if(((struct pardevice *)(pi->pardev))->port->modes &
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(PARPORT_MODE_TRISTATE)
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)
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{
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return 2;
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}
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else /*Just flat SPP*/
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{
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return 1;
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}
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#else
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/* there is no way of knowing what kind of port we have
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default to the highest mode possible */
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return 5;
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#endif
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}
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static int bpck6_probe_unit ( PIA *pi )
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{
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int out;
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if(verbose)
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{
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printk(KERN_DEBUG "PROBE UNIT %x on port:%x\n",pi->unit,pi->port);
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}
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/*SET PPC UNIT NUMBER*/
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PPCSTRUCT(pi)->ppc_id=pi->unit;
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/*LOWER DOWN TO UNIDIRECTIONAL*/
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PPCSTRUCT(pi)->mode=1;
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out=ppc6_open(PPCSTRUCT(pi));
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if(verbose)
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{
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printk(KERN_DEBUG "ppc_open returned %2x\n",out);
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}
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if(out)
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{
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ppc6_close(PPCSTRUCT(pi));
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if(verbose)
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{
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printk(KERN_DEBUG "leaving probe\n");
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}
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return(1);
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}
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else
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{
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if(verbose)
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{
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printk(KERN_DEBUG "Failed open\n");
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}
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return(0);
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}
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}
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static void bpck6_log_adapter( PIA *pi, char * scratch, int verbose )
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{
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char *mode_string[5]=
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{"4-bit","8-bit","EPP-8","EPP-16","EPP-32"};
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printk("%s: BACKPACK Protocol Driver V"BACKPACK_VERSION"\n",pi->device);
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printk("%s: Copyright 2001 by Micro Solutions, Inc., DeKalb IL.\n",pi->device);
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printk("%s: BACKPACK %s, Micro Solutions BACKPACK Drive at 0x%x\n",
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pi->device,BACKPACK_VERSION,pi->port);
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printk("%s: Unit: %d Mode:%d (%s) Delay %d\n",pi->device,
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pi->unit,pi->mode,mode_string[pi->mode],pi->delay);
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}
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static int bpck6_init_proto(PIA *pi)
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{
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Interface *p = kzalloc(sizeof(Interface), GFP_KERNEL);
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if (p) {
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pi->private = (unsigned long)p;
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return 0;
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}
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printk(KERN_ERR "%s: ERROR COULDN'T ALLOCATE MEMORY\n", pi->device);
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return -1;
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}
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static void bpck6_release_proto(PIA *pi)
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{
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kfree((void *)(pi->private));
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}
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static struct pi_protocol bpck6 = {
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.owner = THIS_MODULE,
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.name = "bpck6",
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.max_mode = 5,
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.epp_first = 2, /* 2-5 use epp (need 8 ports) */
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.max_units = 255,
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.write_regr = bpck6_write_regr,
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.read_regr = bpck6_read_regr,
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.write_block = bpck6_write_block,
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.read_block = bpck6_read_block,
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.connect = bpck6_connect,
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.disconnect = bpck6_disconnect,
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.test_port = bpck6_test_port,
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.probe_unit = bpck6_probe_unit,
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.log_adapter = bpck6_log_adapter,
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.init_proto = bpck6_init_proto,
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.release_proto = bpck6_release_proto,
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};
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static int __init bpck6_init(void)
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{
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printk(KERN_INFO "bpck6: BACKPACK Protocol Driver V"BACKPACK_VERSION"\n");
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printk(KERN_INFO "bpck6: Copyright 2001 by Micro Solutions, Inc., DeKalb IL. USA\n");
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if(verbose)
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printk(KERN_DEBUG "bpck6: verbose debug enabled.\n");
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return pi_register(&bpck6) - 1;
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}
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static void __exit bpck6_exit(void)
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{
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pi_unregister(&bpck6);
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}
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Micro Solutions Inc.");
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MODULE_DESCRIPTION("BACKPACK Protocol module, compatible with PARIDE");
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module_param(verbose, bool, 0644);
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module_init(bpck6_init)
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module_exit(bpck6_exit)
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