mirror of https://gitee.com/openkylin/linux.git
1257 lines
30 KiB
C
1257 lines
30 KiB
C
/*
|
|
* linux/drivers/mmc/card/sdio_uart.c - SDIO UART/GPS driver
|
|
*
|
|
* Based on drivers/serial/8250.c and drivers/serial/serial_core.c
|
|
* by Russell King.
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: June 15, 2007
|
|
* Copyright: MontaVista Software, Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Note: Although this driver assumes a 16550A-like UART implementation,
|
|
* it is not possible to leverage the common 8250/16550 driver, nor the
|
|
* core UART infrastructure, as they assumes direct access to the hardware
|
|
* registers, often under a spinlock. This is not possible in the SDIO
|
|
* context as SDIO access functions must be able to sleep.
|
|
*
|
|
* Because we need to lock the SDIO host to ensure an exclusive access to
|
|
* the card, we simply rely on that lock to also prevent and serialize
|
|
* concurrent access to the same port.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/serial_reg.h>
|
|
#include <linux/circ_buf.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
|
|
#include <linux/mmc/core.h>
|
|
#include <linux/mmc/card.h>
|
|
#include <linux/mmc/sdio_func.h>
|
|
#include <linux/mmc/sdio_ids.h>
|
|
|
|
|
|
#define UART_NR 8 /* Number of UARTs this driver can handle */
|
|
|
|
|
|
#define UART_XMIT_SIZE PAGE_SIZE
|
|
#define WAKEUP_CHARS 256
|
|
|
|
#define circ_empty(circ) ((circ)->head == (circ)->tail)
|
|
#define circ_clear(circ) ((circ)->head = (circ)->tail = 0)
|
|
|
|
#define circ_chars_pending(circ) \
|
|
(CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
|
|
|
|
#define circ_chars_free(circ) \
|
|
(CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
|
|
|
|
|
|
struct uart_icount {
|
|
__u32 cts;
|
|
__u32 dsr;
|
|
__u32 rng;
|
|
__u32 dcd;
|
|
__u32 rx;
|
|
__u32 tx;
|
|
__u32 frame;
|
|
__u32 overrun;
|
|
__u32 parity;
|
|
__u32 brk;
|
|
};
|
|
|
|
struct sdio_uart_port {
|
|
struct tty_port port;
|
|
struct kref kref;
|
|
struct tty_struct *tty;
|
|
unsigned int index;
|
|
struct sdio_func *func;
|
|
struct mutex func_lock;
|
|
struct task_struct *in_sdio_uart_irq;
|
|
unsigned int regs_offset;
|
|
struct circ_buf xmit;
|
|
spinlock_t write_lock;
|
|
struct uart_icount icount;
|
|
unsigned int uartclk;
|
|
unsigned int mctrl;
|
|
unsigned int rx_mctrl;
|
|
unsigned int read_status_mask;
|
|
unsigned int ignore_status_mask;
|
|
unsigned char x_char;
|
|
unsigned char ier;
|
|
unsigned char lcr;
|
|
};
|
|
|
|
static struct sdio_uart_port *sdio_uart_table[UART_NR];
|
|
static DEFINE_SPINLOCK(sdio_uart_table_lock);
|
|
|
|
static int sdio_uart_add_port(struct sdio_uart_port *port)
|
|
{
|
|
int index, ret = -EBUSY;
|
|
|
|
kref_init(&port->kref);
|
|
mutex_init(&port->func_lock);
|
|
spin_lock_init(&port->write_lock);
|
|
|
|
spin_lock(&sdio_uart_table_lock);
|
|
for (index = 0; index < UART_NR; index++) {
|
|
if (!sdio_uart_table[index]) {
|
|
port->index = index;
|
|
sdio_uart_table[index] = port;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&sdio_uart_table_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct sdio_uart_port *sdio_uart_port_get(unsigned index)
|
|
{
|
|
struct sdio_uart_port *port;
|
|
|
|
if (index >= UART_NR)
|
|
return NULL;
|
|
|
|
spin_lock(&sdio_uart_table_lock);
|
|
port = sdio_uart_table[index];
|
|
if (port)
|
|
kref_get(&port->kref);
|
|
spin_unlock(&sdio_uart_table_lock);
|
|
|
|
return port;
|
|
}
|
|
|
|
static void sdio_uart_port_destroy(struct kref *kref)
|
|
{
|
|
struct sdio_uart_port *port =
|
|
container_of(kref, struct sdio_uart_port, kref);
|
|
kfree(port);
|
|
}
|
|
|
|
static void sdio_uart_port_put(struct sdio_uart_port *port)
|
|
{
|
|
kref_put(&port->kref, sdio_uart_port_destroy);
|
|
}
|
|
|
|
static void sdio_uart_port_remove(struct sdio_uart_port *port)
|
|
{
|
|
struct sdio_func *func;
|
|
struct tty_struct *tty;
|
|
|
|
BUG_ON(sdio_uart_table[port->index] != port);
|
|
|
|
spin_lock(&sdio_uart_table_lock);
|
|
sdio_uart_table[port->index] = NULL;
|
|
spin_unlock(&sdio_uart_table_lock);
|
|
|
|
/*
|
|
* We're killing a port that potentially still is in use by
|
|
* the tty layer. Be careful to prevent any further access
|
|
* to the SDIO function and arrange for the tty layer to
|
|
* give up on that port ASAP.
|
|
* Beware: the lock ordering is critical.
|
|
*/
|
|
mutex_lock(&port->port.mutex);
|
|
mutex_lock(&port->func_lock);
|
|
func = port->func;
|
|
sdio_claim_host(func);
|
|
port->func = NULL;
|
|
mutex_unlock(&port->func_lock);
|
|
tty = tty_port_tty_get(&port->port);
|
|
/* tty_hangup is async so is this safe as is ?? */
|
|
if (tty) {
|
|
tty_hangup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
mutex_unlock(&port->port.mutex);
|
|
sdio_release_irq(func);
|
|
sdio_disable_func(func);
|
|
sdio_release_host(func);
|
|
|
|
sdio_uart_port_put(port);
|
|
}
|
|
|
|
static int sdio_uart_claim_func(struct sdio_uart_port *port)
|
|
{
|
|
mutex_lock(&port->func_lock);
|
|
if (unlikely(!port->func)) {
|
|
mutex_unlock(&port->func_lock);
|
|
return -ENODEV;
|
|
}
|
|
if (likely(port->in_sdio_uart_irq != current))
|
|
sdio_claim_host(port->func);
|
|
mutex_unlock(&port->func_lock);
|
|
return 0;
|
|
}
|
|
|
|
static inline void sdio_uart_release_func(struct sdio_uart_port *port)
|
|
{
|
|
if (likely(port->in_sdio_uart_irq != current))
|
|
sdio_release_host(port->func);
|
|
}
|
|
|
|
static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
|
|
{
|
|
unsigned char c;
|
|
c = sdio_readb(port->func, port->regs_offset + offset, NULL);
|
|
return c;
|
|
}
|
|
|
|
static inline void sdio_out(struct sdio_uart_port *port, int offset, int value)
|
|
{
|
|
sdio_writeb(port->func, value, port->regs_offset + offset, NULL);
|
|
}
|
|
|
|
static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port)
|
|
{
|
|
unsigned char status;
|
|
unsigned int ret;
|
|
|
|
/* FIXME: What stops this losing the delta bits and breaking
|
|
sdio_uart_check_modem_status ? */
|
|
status = sdio_in(port, UART_MSR);
|
|
|
|
ret = 0;
|
|
if (status & UART_MSR_DCD)
|
|
ret |= TIOCM_CAR;
|
|
if (status & UART_MSR_RI)
|
|
ret |= TIOCM_RNG;
|
|
if (status & UART_MSR_DSR)
|
|
ret |= TIOCM_DSR;
|
|
if (status & UART_MSR_CTS)
|
|
ret |= TIOCM_CTS;
|
|
return ret;
|
|
}
|
|
|
|
static void sdio_uart_write_mctrl(struct sdio_uart_port *port,
|
|
unsigned int mctrl)
|
|
{
|
|
unsigned char mcr = 0;
|
|
|
|
if (mctrl & TIOCM_RTS)
|
|
mcr |= UART_MCR_RTS;
|
|
if (mctrl & TIOCM_DTR)
|
|
mcr |= UART_MCR_DTR;
|
|
if (mctrl & TIOCM_OUT1)
|
|
mcr |= UART_MCR_OUT1;
|
|
if (mctrl & TIOCM_OUT2)
|
|
mcr |= UART_MCR_OUT2;
|
|
if (mctrl & TIOCM_LOOP)
|
|
mcr |= UART_MCR_LOOP;
|
|
|
|
sdio_out(port, UART_MCR, mcr);
|
|
}
|
|
|
|
static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
unsigned int old;
|
|
|
|
old = port->mctrl;
|
|
port->mctrl = (old & ~clear) | set;
|
|
if (old != port->mctrl)
|
|
sdio_uart_write_mctrl(port, port->mctrl);
|
|
}
|
|
|
|
#define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0)
|
|
#define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x)
|
|
|
|
static void sdio_uart_change_speed(struct sdio_uart_port *port,
|
|
struct ktermios *termios,
|
|
struct ktermios *old)
|
|
{
|
|
unsigned char cval, fcr = 0;
|
|
unsigned int baud, quot;
|
|
|
|
switch (termios->c_cflag & CSIZE) {
|
|
case CS5:
|
|
cval = UART_LCR_WLEN5;
|
|
break;
|
|
case CS6:
|
|
cval = UART_LCR_WLEN6;
|
|
break;
|
|
case CS7:
|
|
cval = UART_LCR_WLEN7;
|
|
break;
|
|
default:
|
|
case CS8:
|
|
cval = UART_LCR_WLEN8;
|
|
break;
|
|
}
|
|
|
|
if (termios->c_cflag & CSTOPB)
|
|
cval |= UART_LCR_STOP;
|
|
if (termios->c_cflag & PARENB)
|
|
cval |= UART_LCR_PARITY;
|
|
if (!(termios->c_cflag & PARODD))
|
|
cval |= UART_LCR_EPAR;
|
|
|
|
for (;;) {
|
|
baud = tty_termios_baud_rate(termios);
|
|
if (baud == 0)
|
|
baud = 9600; /* Special case: B0 rate. */
|
|
if (baud <= port->uartclk)
|
|
break;
|
|
/*
|
|
* Oops, the quotient was zero. Try again with the old
|
|
* baud rate if possible, otherwise default to 9600.
|
|
*/
|
|
termios->c_cflag &= ~CBAUD;
|
|
if (old) {
|
|
termios->c_cflag |= old->c_cflag & CBAUD;
|
|
old = NULL;
|
|
} else
|
|
termios->c_cflag |= B9600;
|
|
}
|
|
quot = (2 * port->uartclk + baud) / (2 * baud);
|
|
|
|
if (baud < 2400)
|
|
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
|
|
else
|
|
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
|
|
|
|
port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
|
|
if (termios->c_iflag & INPCK)
|
|
port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
|
|
if (termios->c_iflag & (BRKINT | PARMRK))
|
|
port->read_status_mask |= UART_LSR_BI;
|
|
|
|
/*
|
|
* Characters to ignore
|
|
*/
|
|
port->ignore_status_mask = 0;
|
|
if (termios->c_iflag & IGNPAR)
|
|
port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
|
if (termios->c_iflag & IGNBRK) {
|
|
port->ignore_status_mask |= UART_LSR_BI;
|
|
/*
|
|
* If we're ignoring parity and break indicators,
|
|
* ignore overruns too (for real raw support).
|
|
*/
|
|
if (termios->c_iflag & IGNPAR)
|
|
port->ignore_status_mask |= UART_LSR_OE;
|
|
}
|
|
|
|
/*
|
|
* ignore all characters if CREAD is not set
|
|
*/
|
|
if ((termios->c_cflag & CREAD) == 0)
|
|
port->ignore_status_mask |= UART_LSR_DR;
|
|
|
|
/*
|
|
* CTS flow control flag and modem status interrupts
|
|
*/
|
|
port->ier &= ~UART_IER_MSI;
|
|
if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL))
|
|
port->ier |= UART_IER_MSI;
|
|
|
|
port->lcr = cval;
|
|
|
|
sdio_out(port, UART_IER, port->ier);
|
|
sdio_out(port, UART_LCR, cval | UART_LCR_DLAB);
|
|
sdio_out(port, UART_DLL, quot & 0xff);
|
|
sdio_out(port, UART_DLM, quot >> 8);
|
|
sdio_out(port, UART_LCR, cval);
|
|
sdio_out(port, UART_FCR, fcr);
|
|
|
|
sdio_uart_write_mctrl(port, port->mctrl);
|
|
}
|
|
|
|
static void sdio_uart_start_tx(struct sdio_uart_port *port)
|
|
{
|
|
if (!(port->ier & UART_IER_THRI)) {
|
|
port->ier |= UART_IER_THRI;
|
|
sdio_out(port, UART_IER, port->ier);
|
|
}
|
|
}
|
|
|
|
static void sdio_uart_stop_tx(struct sdio_uart_port *port)
|
|
{
|
|
if (port->ier & UART_IER_THRI) {
|
|
port->ier &= ~UART_IER_THRI;
|
|
sdio_out(port, UART_IER, port->ier);
|
|
}
|
|
}
|
|
|
|
static void sdio_uart_stop_rx(struct sdio_uart_port *port)
|
|
{
|
|
port->ier &= ~UART_IER_RLSI;
|
|
port->read_status_mask &= ~UART_LSR_DR;
|
|
sdio_out(port, UART_IER, port->ier);
|
|
}
|
|
|
|
static void sdio_uart_receive_chars(struct sdio_uart_port *port,
|
|
unsigned int *status)
|
|
{
|
|
struct tty_struct *tty = tty_port_tty_get(&port->port);
|
|
unsigned int ch, flag;
|
|
int max_count = 256;
|
|
|
|
do {
|
|
ch = sdio_in(port, UART_RX);
|
|
flag = TTY_NORMAL;
|
|
port->icount.rx++;
|
|
|
|
if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
|
|
UART_LSR_FE | UART_LSR_OE))) {
|
|
/*
|
|
* For statistics only
|
|
*/
|
|
if (*status & UART_LSR_BI) {
|
|
*status &= ~(UART_LSR_FE | UART_LSR_PE);
|
|
port->icount.brk++;
|
|
} else if (*status & UART_LSR_PE)
|
|
port->icount.parity++;
|
|
else if (*status & UART_LSR_FE)
|
|
port->icount.frame++;
|
|
if (*status & UART_LSR_OE)
|
|
port->icount.overrun++;
|
|
|
|
/*
|
|
* Mask off conditions which should be ignored.
|
|
*/
|
|
*status &= port->read_status_mask;
|
|
if (*status & UART_LSR_BI)
|
|
flag = TTY_BREAK;
|
|
else if (*status & UART_LSR_PE)
|
|
flag = TTY_PARITY;
|
|
else if (*status & UART_LSR_FE)
|
|
flag = TTY_FRAME;
|
|
}
|
|
|
|
if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0)
|
|
if (tty)
|
|
tty_insert_flip_char(tty, ch, flag);
|
|
|
|
/*
|
|
* Overrun is special. Since it's reported immediately,
|
|
* it doesn't affect the current character.
|
|
*/
|
|
if (*status & ~port->ignore_status_mask & UART_LSR_OE)
|
|
if (tty)
|
|
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
|
|
|
|
*status = sdio_in(port, UART_LSR);
|
|
} while ((*status & UART_LSR_DR) && (max_count-- > 0));
|
|
if (tty) {
|
|
tty_flip_buffer_push(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
}
|
|
|
|
static void sdio_uart_transmit_chars(struct sdio_uart_port *port)
|
|
{
|
|
struct circ_buf *xmit = &port->xmit;
|
|
int count;
|
|
struct tty_struct *tty;
|
|
|
|
if (port->x_char) {
|
|
sdio_out(port, UART_TX, port->x_char);
|
|
port->icount.tx++;
|
|
port->x_char = 0;
|
|
return;
|
|
}
|
|
|
|
tty = tty_port_tty_get(&port->port);
|
|
|
|
if (tty == NULL || circ_empty(xmit) ||
|
|
tty->stopped || tty->hw_stopped) {
|
|
sdio_uart_stop_tx(port);
|
|
tty_kref_put(tty);
|
|
return;
|
|
}
|
|
|
|
count = 16;
|
|
do {
|
|
sdio_out(port, UART_TX, xmit->buf[xmit->tail]);
|
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
|
|
port->icount.tx++;
|
|
if (circ_empty(xmit))
|
|
break;
|
|
} while (--count > 0);
|
|
|
|
if (circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
tty_wakeup(tty);
|
|
|
|
if (circ_empty(xmit))
|
|
sdio_uart_stop_tx(port);
|
|
tty_kref_put(tty);
|
|
}
|
|
|
|
static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
|
|
{
|
|
int status;
|
|
struct tty_struct *tty;
|
|
|
|
status = sdio_in(port, UART_MSR);
|
|
|
|
if ((status & UART_MSR_ANY_DELTA) == 0)
|
|
return;
|
|
|
|
if (status & UART_MSR_TERI)
|
|
port->icount.rng++;
|
|
if (status & UART_MSR_DDSR)
|
|
port->icount.dsr++;
|
|
if (status & UART_MSR_DDCD) {
|
|
port->icount.dcd++;
|
|
/* DCD raise - wake for open */
|
|
if (status & UART_MSR_DCD)
|
|
wake_up_interruptible(&port->port.open_wait);
|
|
else {
|
|
/* DCD drop - hang up if tty attached */
|
|
tty = tty_port_tty_get(&port->port);
|
|
if (tty) {
|
|
tty_hangup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
}
|
|
}
|
|
if (status & UART_MSR_DCTS) {
|
|
port->icount.cts++;
|
|
tty = tty_port_tty_get(&port->port);
|
|
if (tty && (tty->termios->c_cflag & CRTSCTS)) {
|
|
int cts = (status & UART_MSR_CTS);
|
|
if (tty->hw_stopped) {
|
|
if (cts) {
|
|
tty->hw_stopped = 0;
|
|
sdio_uart_start_tx(port);
|
|
tty_wakeup(tty);
|
|
}
|
|
} else {
|
|
if (!cts) {
|
|
tty->hw_stopped = 1;
|
|
sdio_uart_stop_tx(port);
|
|
}
|
|
}
|
|
}
|
|
tty_kref_put(tty);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This handles the interrupt from one port.
|
|
*/
|
|
static void sdio_uart_irq(struct sdio_func *func)
|
|
{
|
|
struct sdio_uart_port *port = sdio_get_drvdata(func);
|
|
unsigned int iir, lsr;
|
|
|
|
/*
|
|
* In a few places sdio_uart_irq() is called directly instead of
|
|
* waiting for the actual interrupt to be raised and the SDIO IRQ
|
|
* thread scheduled in order to reduce latency. However, some
|
|
* interaction with the tty core may end up calling us back
|
|
* (serial echo, flow control, etc.) through those same places
|
|
* causing undesirable effects. Let's stop the recursion here.
|
|
*/
|
|
if (unlikely(port->in_sdio_uart_irq == current))
|
|
return;
|
|
|
|
iir = sdio_in(port, UART_IIR);
|
|
if (iir & UART_IIR_NO_INT)
|
|
return;
|
|
|
|
port->in_sdio_uart_irq = current;
|
|
lsr = sdio_in(port, UART_LSR);
|
|
if (lsr & UART_LSR_DR)
|
|
sdio_uart_receive_chars(port, &lsr);
|
|
sdio_uart_check_modem_status(port);
|
|
if (lsr & UART_LSR_THRE)
|
|
sdio_uart_transmit_chars(port);
|
|
port->in_sdio_uart_irq = NULL;
|
|
}
|
|
|
|
static int uart_carrier_raised(struct tty_port *tport)
|
|
{
|
|
struct sdio_uart_port *port =
|
|
container_of(tport, struct sdio_uart_port, port);
|
|
unsigned int ret = sdio_uart_claim_func(port);
|
|
if (ret) /* Missing hardware shoudn't block for carrier */
|
|
return 1;
|
|
ret = sdio_uart_get_mctrl(port);
|
|
sdio_uart_release_func(port);
|
|
if (ret & TIOCM_CAR)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* uart_dtr_rts - port helper to set uart signals
|
|
* @tport: tty port to be updated
|
|
* @onoff: set to turn on DTR/RTS
|
|
*
|
|
* Called by the tty port helpers when the modem signals need to be
|
|
* adjusted during an open, close and hangup.
|
|
*/
|
|
|
|
static void uart_dtr_rts(struct tty_port *tport, int onoff)
|
|
{
|
|
struct sdio_uart_port *port =
|
|
container_of(tport, struct sdio_uart_port, port);
|
|
int ret = sdio_uart_claim_func(port);
|
|
if (ret)
|
|
return;
|
|
if (onoff == 0)
|
|
sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
|
|
else
|
|
sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
/**
|
|
* sdio_uart_activate - start up hardware
|
|
* @tport: tty port to activate
|
|
* @tty: tty bound to this port
|
|
*
|
|
* Activate a tty port. The port locking guarantees us this will be
|
|
* run exactly once per set of opens, and if successful will see the
|
|
* shutdown method run exactly once to match. Start up and shutdown are
|
|
* protected from each other by the internal locking and will not run
|
|
* at the same time even during a hangup event.
|
|
*
|
|
* If we successfully start up the port we take an extra kref as we
|
|
* will keep it around until shutdown when the kref is dropped.
|
|
*/
|
|
|
|
static int sdio_uart_activate(struct tty_port *tport, struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port =
|
|
container_of(tport, struct sdio_uart_port, port);
|
|
unsigned long page;
|
|
int ret;
|
|
|
|
/*
|
|
* Set the TTY IO error marker - we will only clear this
|
|
* once we have successfully opened the port.
|
|
*/
|
|
set_bit(TTY_IO_ERROR, &tty->flags);
|
|
|
|
/* Initialise and allocate the transmit buffer. */
|
|
page = __get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
port->xmit.buf = (unsigned char *)page;
|
|
circ_clear(&port->xmit);
|
|
|
|
ret = sdio_uart_claim_func(port);
|
|
if (ret)
|
|
goto err1;
|
|
ret = sdio_enable_func(port->func);
|
|
if (ret)
|
|
goto err2;
|
|
ret = sdio_claim_irq(port->func, sdio_uart_irq);
|
|
if (ret)
|
|
goto err3;
|
|
|
|
/*
|
|
* Clear the FIFO buffers and disable them.
|
|
* (they will be reenabled in sdio_change_speed())
|
|
*/
|
|
sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
|
|
sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
|
|
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
|
|
sdio_out(port, UART_FCR, 0);
|
|
|
|
/*
|
|
* Clear the interrupt registers.
|
|
*/
|
|
(void) sdio_in(port, UART_LSR);
|
|
(void) sdio_in(port, UART_RX);
|
|
(void) sdio_in(port, UART_IIR);
|
|
(void) sdio_in(port, UART_MSR);
|
|
|
|
/*
|
|
* Now, initialize the UART
|
|
*/
|
|
sdio_out(port, UART_LCR, UART_LCR_WLEN8);
|
|
|
|
port->ier = UART_IER_RLSI|UART_IER_RDI|UART_IER_RTOIE|UART_IER_UUE;
|
|
port->mctrl = TIOCM_OUT2;
|
|
|
|
sdio_uart_change_speed(port, tty->termios, NULL);
|
|
|
|
if (tty->termios->c_cflag & CBAUD)
|
|
sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS)
|
|
if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS))
|
|
tty->hw_stopped = 1;
|
|
|
|
clear_bit(TTY_IO_ERROR, &tty->flags);
|
|
|
|
/* Kick the IRQ handler once while we're still holding the host lock */
|
|
sdio_uart_irq(port->func);
|
|
|
|
sdio_uart_release_func(port);
|
|
return 0;
|
|
|
|
err3:
|
|
sdio_disable_func(port->func);
|
|
err2:
|
|
sdio_uart_release_func(port);
|
|
err1:
|
|
free_page((unsigned long)port->xmit.buf);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sdio_uart_shutdown - stop hardware
|
|
* @tport: tty port to shut down
|
|
*
|
|
* Deactivate a tty port. The port locking guarantees us this will be
|
|
* run only if a successful matching activate already ran. The two are
|
|
* protected from each other by the internal locking and will not run
|
|
* at the same time even during a hangup event.
|
|
*/
|
|
|
|
static void sdio_uart_shutdown(struct tty_port *tport)
|
|
{
|
|
struct sdio_uart_port *port =
|
|
container_of(tport, struct sdio_uart_port, port);
|
|
int ret;
|
|
|
|
ret = sdio_uart_claim_func(port);
|
|
if (ret)
|
|
goto skip;
|
|
|
|
sdio_uart_stop_rx(port);
|
|
|
|
/* Disable interrupts from this port */
|
|
sdio_release_irq(port->func);
|
|
port->ier = 0;
|
|
sdio_out(port, UART_IER, 0);
|
|
|
|
sdio_uart_clear_mctrl(port, TIOCM_OUT2);
|
|
|
|
/* Disable break condition and FIFOs. */
|
|
port->lcr &= ~UART_LCR_SBC;
|
|
sdio_out(port, UART_LCR, port->lcr);
|
|
sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
|
|
UART_FCR_CLEAR_RCVR |
|
|
UART_FCR_CLEAR_XMIT);
|
|
sdio_out(port, UART_FCR, 0);
|
|
|
|
sdio_disable_func(port->func);
|
|
|
|
sdio_uart_release_func(port);
|
|
|
|
skip:
|
|
/* Free the transmit buffer page. */
|
|
free_page((unsigned long)port->xmit.buf);
|
|
}
|
|
|
|
/**
|
|
* sdio_uart_install - install method
|
|
* @driver: the driver in use (sdio_uart in our case)
|
|
* @tty: the tty being bound
|
|
*
|
|
* Look up and bind the tty and the driver together. Initialize
|
|
* any needed private data (in our case the termios)
|
|
*/
|
|
|
|
static int sdio_uart_install(struct tty_driver *driver, struct tty_struct *tty)
|
|
{
|
|
int idx = tty->index;
|
|
struct sdio_uart_port *port = sdio_uart_port_get(idx);
|
|
int ret = tty_init_termios(tty);
|
|
|
|
if (ret == 0) {
|
|
tty_driver_kref_get(driver);
|
|
tty->count++;
|
|
/* This is the ref sdio_uart_port get provided */
|
|
tty->driver_data = port;
|
|
driver->ttys[idx] = tty;
|
|
} else
|
|
sdio_uart_port_put(port);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sdio_uart_cleanup - called on the last tty kref drop
|
|
* @tty: the tty being destroyed
|
|
*
|
|
* Called asynchronously when the last reference to the tty is dropped.
|
|
* We cannot destroy the tty->driver_data port kref until this point
|
|
*/
|
|
|
|
static void sdio_uart_cleanup(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
tty->driver_data = NULL; /* Bug trap */
|
|
sdio_uart_port_put(port);
|
|
}
|
|
|
|
/*
|
|
* Open/close/hangup is now entirely boilerplate
|
|
*/
|
|
|
|
static int sdio_uart_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
return tty_port_open(&port->port, tty, filp);
|
|
}
|
|
|
|
static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
tty_port_close(&port->port, tty, filp);
|
|
}
|
|
|
|
static void sdio_uart_hangup(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
tty_port_hangup(&port->port);
|
|
}
|
|
|
|
static int sdio_uart_write(struct tty_struct *tty, const unsigned char *buf,
|
|
int count)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
struct circ_buf *circ = &port->xmit;
|
|
int c, ret = 0;
|
|
|
|
if (!port->func)
|
|
return -ENODEV;
|
|
|
|
spin_lock(&port->write_lock);
|
|
while (1) {
|
|
c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
|
|
if (count < c)
|
|
c = count;
|
|
if (c <= 0)
|
|
break;
|
|
memcpy(circ->buf + circ->head, buf, c);
|
|
circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
spin_unlock(&port->write_lock);
|
|
|
|
if (!(port->ier & UART_IER_THRI)) {
|
|
int err = sdio_uart_claim_func(port);
|
|
if (!err) {
|
|
sdio_uart_start_tx(port);
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
} else
|
|
ret = err;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sdio_uart_write_room(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
return port ? circ_chars_free(&port->xmit) : 0;
|
|
}
|
|
|
|
static int sdio_uart_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
return port ? circ_chars_pending(&port->xmit) : 0;
|
|
}
|
|
|
|
static void sdio_uart_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
|
|
port->x_char = ch;
|
|
if (ch && !(port->ier & UART_IER_THRI)) {
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
sdio_uart_start_tx(port);
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
}
|
|
|
|
static void sdio_uart_throttle(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
|
|
if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
|
|
return;
|
|
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
port->x_char = STOP_CHAR(tty);
|
|
sdio_uart_start_tx(port);
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS)
|
|
sdio_uart_clear_mctrl(port, TIOCM_RTS);
|
|
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
static void sdio_uart_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
|
|
if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
|
|
return;
|
|
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
if (port->x_char) {
|
|
port->x_char = 0;
|
|
} else {
|
|
port->x_char = START_CHAR(tty);
|
|
sdio_uart_start_tx(port);
|
|
}
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS)
|
|
sdio_uart_set_mctrl(port, TIOCM_RTS);
|
|
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
static void sdio_uart_set_termios(struct tty_struct *tty,
|
|
struct ktermios *old_termios)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
unsigned int cflag = tty->termios->c_cflag;
|
|
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
|
|
sdio_uart_change_speed(port, tty->termios, old_termios);
|
|
|
|
/* Handle transition to B0 status */
|
|
if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
|
|
sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR);
|
|
|
|
/* Handle transition away from B0 status */
|
|
if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
|
|
unsigned int mask = TIOCM_DTR;
|
|
if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
|
|
mask |= TIOCM_RTS;
|
|
sdio_uart_set_mctrl(port, mask);
|
|
}
|
|
|
|
/* Handle turning off CRTSCTS */
|
|
if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
|
|
tty->hw_stopped = 0;
|
|
sdio_uart_start_tx(port);
|
|
}
|
|
|
|
/* Handle turning on CRTSCTS */
|
|
if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
|
|
if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) {
|
|
tty->hw_stopped = 1;
|
|
sdio_uart_stop_tx(port);
|
|
}
|
|
}
|
|
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
int result;
|
|
|
|
result = sdio_uart_claim_func(port);
|
|
if (result != 0)
|
|
return result;
|
|
|
|
if (break_state == -1)
|
|
port->lcr |= UART_LCR_SBC;
|
|
else
|
|
port->lcr &= ~UART_LCR_SBC;
|
|
sdio_out(port, UART_LCR, port->lcr);
|
|
|
|
sdio_uart_release_func(port);
|
|
return 0;
|
|
}
|
|
|
|
static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
int result;
|
|
|
|
result = sdio_uart_claim_func(port);
|
|
if (!result) {
|
|
result = port->mctrl | sdio_uart_get_mctrl(port);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
int result;
|
|
|
|
result = sdio_uart_claim_func(port);
|
|
if (!result) {
|
|
sdio_uart_update_mctrl(port, set, clear);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static int sdio_uart_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
int i;
|
|
|
|
seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
|
|
"", "", "");
|
|
for (i = 0; i < UART_NR; i++) {
|
|
struct sdio_uart_port *port = sdio_uart_port_get(i);
|
|
if (port) {
|
|
seq_printf(m, "%d: uart:SDIO", i);
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
seq_printf(m, " tx:%d rx:%d",
|
|
port->icount.tx, port->icount.rx);
|
|
if (port->icount.frame)
|
|
seq_printf(m, " fe:%d",
|
|
port->icount.frame);
|
|
if (port->icount.parity)
|
|
seq_printf(m, " pe:%d",
|
|
port->icount.parity);
|
|
if (port->icount.brk)
|
|
seq_printf(m, " brk:%d",
|
|
port->icount.brk);
|
|
if (port->icount.overrun)
|
|
seq_printf(m, " oe:%d",
|
|
port->icount.overrun);
|
|
if (port->icount.cts)
|
|
seq_printf(m, " cts:%d",
|
|
port->icount.cts);
|
|
if (port->icount.dsr)
|
|
seq_printf(m, " dsr:%d",
|
|
port->icount.dsr);
|
|
if (port->icount.rng)
|
|
seq_printf(m, " rng:%d",
|
|
port->icount.rng);
|
|
if (port->icount.dcd)
|
|
seq_printf(m, " dcd:%d",
|
|
port->icount.dcd);
|
|
}
|
|
sdio_uart_port_put(port);
|
|
seq_putc(m, '\n');
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int sdio_uart_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, sdio_uart_proc_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations sdio_uart_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = sdio_uart_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static const struct tty_port_operations sdio_uart_port_ops = {
|
|
.dtr_rts = uart_dtr_rts,
|
|
.carrier_raised = uart_carrier_raised,
|
|
.shutdown = sdio_uart_shutdown,
|
|
.activate = sdio_uart_activate,
|
|
};
|
|
|
|
static const struct tty_operations sdio_uart_ops = {
|
|
.open = sdio_uart_open,
|
|
.close = sdio_uart_close,
|
|
.write = sdio_uart_write,
|
|
.write_room = sdio_uart_write_room,
|
|
.chars_in_buffer = sdio_uart_chars_in_buffer,
|
|
.send_xchar = sdio_uart_send_xchar,
|
|
.throttle = sdio_uart_throttle,
|
|
.unthrottle = sdio_uart_unthrottle,
|
|
.set_termios = sdio_uart_set_termios,
|
|
.hangup = sdio_uart_hangup,
|
|
.break_ctl = sdio_uart_break_ctl,
|
|
.tiocmget = sdio_uart_tiocmget,
|
|
.tiocmset = sdio_uart_tiocmset,
|
|
.install = sdio_uart_install,
|
|
.cleanup = sdio_uart_cleanup,
|
|
.proc_fops = &sdio_uart_proc_fops,
|
|
};
|
|
|
|
static struct tty_driver *sdio_uart_tty_driver;
|
|
|
|
static int sdio_uart_probe(struct sdio_func *func,
|
|
const struct sdio_device_id *id)
|
|
{
|
|
struct sdio_uart_port *port;
|
|
int ret;
|
|
|
|
port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL);
|
|
if (!port)
|
|
return -ENOMEM;
|
|
|
|
if (func->class == SDIO_CLASS_UART) {
|
|
printk(KERN_WARNING "%s: need info on UART class basic setup\n",
|
|
sdio_func_id(func));
|
|
kfree(port);
|
|
return -ENOSYS;
|
|
} else if (func->class == SDIO_CLASS_GPS) {
|
|
/*
|
|
* We need tuple 0x91. It contains SUBTPL_SIOREG
|
|
* and SUBTPL_RCVCAPS.
|
|
*/
|
|
struct sdio_func_tuple *tpl;
|
|
for (tpl = func->tuples; tpl; tpl = tpl->next) {
|
|
if (tpl->code != 0x91)
|
|
continue;
|
|
if (tpl->size < 10)
|
|
continue;
|
|
if (tpl->data[1] == 0) /* SUBTPL_SIOREG */
|
|
break;
|
|
}
|
|
if (!tpl) {
|
|
printk(KERN_WARNING
|
|
"%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n",
|
|
sdio_func_id(func));
|
|
kfree(port);
|
|
return -EINVAL;
|
|
}
|
|
printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n",
|
|
sdio_func_id(func), tpl->data[2], tpl->data[3]);
|
|
port->regs_offset = (tpl->data[4] << 0) |
|
|
(tpl->data[5] << 8) |
|
|
(tpl->data[6] << 16);
|
|
printk(KERN_DEBUG "%s: regs offset = 0x%x\n",
|
|
sdio_func_id(func), port->regs_offset);
|
|
port->uartclk = tpl->data[7] * 115200;
|
|
if (port->uartclk == 0)
|
|
port->uartclk = 115200;
|
|
printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n",
|
|
sdio_func_id(func), port->uartclk,
|
|
tpl->data[7], tpl->data[8] | (tpl->data[9] << 8));
|
|
} else {
|
|
kfree(port);
|
|
return -EINVAL;
|
|
}
|
|
|
|
port->func = func;
|
|
sdio_set_drvdata(func, port);
|
|
tty_port_init(&port->port);
|
|
port->port.ops = &sdio_uart_port_ops;
|
|
|
|
ret = sdio_uart_add_port(port);
|
|
if (ret) {
|
|
kfree(port);
|
|
} else {
|
|
struct device *dev;
|
|
dev = tty_register_device(sdio_uart_tty_driver,
|
|
port->index, &func->dev);
|
|
if (IS_ERR(dev)) {
|
|
sdio_uart_port_remove(port);
|
|
ret = PTR_ERR(dev);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sdio_uart_remove(struct sdio_func *func)
|
|
{
|
|
struct sdio_uart_port *port = sdio_get_drvdata(func);
|
|
|
|
tty_unregister_device(sdio_uart_tty_driver, port->index);
|
|
sdio_uart_port_remove(port);
|
|
}
|
|
|
|
static const struct sdio_device_id sdio_uart_ids[] = {
|
|
{ SDIO_DEVICE_CLASS(SDIO_CLASS_UART) },
|
|
{ SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) },
|
|
{ /* end: all zeroes */ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(sdio, sdio_uart_ids);
|
|
|
|
static struct sdio_driver sdio_uart_driver = {
|
|
.probe = sdio_uart_probe,
|
|
.remove = sdio_uart_remove,
|
|
.name = "sdio_uart",
|
|
.id_table = sdio_uart_ids,
|
|
};
|
|
|
|
static int __init sdio_uart_init(void)
|
|
{
|
|
int ret;
|
|
struct tty_driver *tty_drv;
|
|
|
|
sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR);
|
|
if (!tty_drv)
|
|
return -ENOMEM;
|
|
|
|
tty_drv->owner = THIS_MODULE;
|
|
tty_drv->driver_name = "sdio_uart";
|
|
tty_drv->name = "ttySDIO";
|
|
tty_drv->major = 0; /* dynamically allocated */
|
|
tty_drv->minor_start = 0;
|
|
tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
|
|
tty_drv->subtype = SERIAL_TYPE_NORMAL;
|
|
tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
|
|
tty_drv->init_termios = tty_std_termios;
|
|
tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
tty_drv->init_termios.c_ispeed = 4800;
|
|
tty_drv->init_termios.c_ospeed = 4800;
|
|
tty_set_operations(tty_drv, &sdio_uart_ops);
|
|
|
|
ret = tty_register_driver(tty_drv);
|
|
if (ret)
|
|
goto err1;
|
|
|
|
ret = sdio_register_driver(&sdio_uart_driver);
|
|
if (ret)
|
|
goto err2;
|
|
|
|
return 0;
|
|
|
|
err2:
|
|
tty_unregister_driver(tty_drv);
|
|
err1:
|
|
put_tty_driver(tty_drv);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit sdio_uart_exit(void)
|
|
{
|
|
sdio_unregister_driver(&sdio_uart_driver);
|
|
tty_unregister_driver(sdio_uart_tty_driver);
|
|
put_tty_driver(sdio_uart_tty_driver);
|
|
}
|
|
|
|
module_init(sdio_uart_init);
|
|
module_exit(sdio_uart_exit);
|
|
|
|
MODULE_AUTHOR("Nicolas Pitre");
|
|
MODULE_LICENSE("GPL");
|