/*
* m32r_sio.c
*
* Driver for M32R serial ports
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
* Based on drivers/serial/8250.c.
*
* Copyright (C) 2001 Russell King.
* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
*
* 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.
*/
/*
* A note about mapbase / membase
*
* mapbase is the physical address of the IO port. Currently, we don't
* support this very well, and it may well be dropped from this driver
* in future. As such, mapbase should be NULL.
*
* membase is an 'ioremapped' cookie. This is compatible with the old
* serial.c driver, and is currently the preferred form.
*/
#if defined(CONFIG_SERIAL_M32R_SIO_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/serial.h>
#include <linux/delay.h>
#include <asm/m32r.h>
#include <asm/io.h>
#include <asm/irq.h>
#define BAUD_RATE 115200
#include <linux/serial_core.h>
#include "m32r_sio.h"
#include "m32r_sio_reg.h"
/*
* Debugging.
*/
#if 0
#define DEBUG_AUTOCONF(fmt...) printk(fmt)
#else
#define DEBUG_AUTOCONF(fmt...) do { } while (0)
#endif
#if 0
#define DEBUG_INTR(fmt...) printk(fmt)
#else
#define DEBUG_INTR(fmt...) do { } while (0)
#endif
#define PASS_LIMIT 256
#define BASE_BAUD 115200
/* Standard COM flags */
#define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
/*
* SERIAL_PORT_DFNS tells us about built-in ports that have no
* standard enumeration mechanism. Platforms that can find all
* serial ports via mechanisms like ACPI or PCI need not supply it.
*/
#if defined(CONFIG_PLAT_USRV)
#define SERIAL_PORT_DFNS \
/* UART CLK PORT IRQ FLAGS */ \
{ 0, BASE_BAUD, 0x3F8, PLD_IRQ_UART0, STD_COM_FLAGS }, /* ttyS0 */ \
{ 0, BASE_BAUD, 0x2F8, PLD_IRQ_UART1, STD_COM_FLAGS }, /* ttyS1 */
#else /* !CONFIG_PLAT_USRV */
#if defined(CONFIG_SERIAL_M32R_PLDSIO)
#define SERIAL_PORT_DFNS \
{ 0, BASE_BAUD, ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV, \
STD_COM_FLAGS }, /* ttyS0 */
#else
#define SERIAL_PORT_DFNS \
{ 0, BASE_BAUD, M32R_SIO_OFFSET, M32R_IRQ_SIO0_R, \
STD_COM_FLAGS }, /* ttyS0 */
#endif
#endif /* !CONFIG_PLAT_USRV */
static struct old_serial_port old_serial_port[] = {
SERIAL_PORT_DFNS
};
#define UART_NR ARRAY_SIZE(old_serial_port)
struct uart_sio_port {
struct uart_port port;
struct timer_list timer; /* "no irq" timer */
struct list_head list; /* ports on this IRQ */
unsigned short rev;
unsigned char acr;
unsigned char ier;
unsigned char lcr;
unsigned char mcr_mask; /* mask of user bits */
unsigned char mcr_force; /* mask of forced bits */
unsigned char lsr_break_flag;
/*
* We provide a per-port pm hook.
*/
void (*pm)(struct uart_port *port,
unsigned int state, unsigned int old);
};
struct irq_info {
spinlock_t lock;
struct list_head *head;
};
static struct irq_info irq_lists[NR_IRQS];
#ifdef CONFIG_SERIAL_M32R_PLDSIO
#define __sio_in(x) inw((unsigned long)(x))
#define __sio_out(v,x) outw((v),(unsigned long)(x))
static inline void sio_set_baud_rate(unsigned long baud)
{
unsigned short sbaud;
sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1;
__sio_out(sbaud, PLD_ESIO0BAUR);
}
static void sio_reset(void)
{
unsigned short tmp;
tmp = __sio_in(PLD_ESIO0RXB);
tmp = __sio_in(PLD_ESIO0RXB);
tmp = __sio_in(PLD_ESIO0CR);
sio_set_baud_rate(BAUD_RATE);
__sio_out(0x0300, PLD_ESIO0CR);
__sio_out(0x0003, PLD_ESIO0CR);
}
static void sio_init(void)
{
unsigned short tmp;
tmp = __sio_in(PLD_ESIO0RXB);
tmp = __sio_in(PLD_ESIO0RXB);
tmp = __sio_in(PLD_ESIO0CR);
__sio_out(0x0300, PLD_ESIO0CR);
__sio_out(0x0003, PLD_ESIO0CR);
}
static void sio_error(int *status)
{
printk("SIO0 error[%04x]\n", *status);
do {
sio_init();
} while ((*status = __sio_in(PLD_ESIO0CR)) != 3);
}
#else /* not CONFIG_SERIAL_M32R_PLDSIO */
#define __sio_in(x) inl(x)
#define __sio_out(v,x) outl((v),(x))
static inline void sio_set_baud_rate(unsigned long baud)
{
unsigned long i, j;
i = boot_cpu_data.bus_clock / (baud * 16);
j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud;
i -= 1;
j = (j + 1) >> 1;
__sio_out(i, M32R_SIO0_BAUR_PORTL);
__sio_out(j, M32R_SIO0_RBAUR_PORTL);
}
static void sio_reset(void)
{
__sio_out(0x00000300, M32R_SIO0_CR_PORTL); /* init status */
__sio_out(0x00000800, M32R_SIO0_MOD1_PORTL); /* 8bit */
__sio_out(0x00000080, M32R_SIO0_MOD0_PORTL); /* 1stop non */
sio_set_baud_rate(BAUD_RATE);
__sio_out(0x00000000, M32R_SIO0_TRCR_PORTL);
__sio_out(0x00000003, M32R_SIO0_CR_PORTL); /* RXCEN */
}
static void sio_init(void)
{
unsigned int tmp;
tmp = __sio_in(M32R_SIO0_RXB_PORTL);
tmp = __sio_in(M32R_SIO0_RXB_PORTL);
tmp = __sio_in(M32R_SIO0_STS_PORTL);
__sio_out(0x00000003, M32R_SIO0_CR_PORTL);
}
static void sio_error(int *status)
{
printk("SIO0 error[%04x]\n", *status);
do {
sio_init();
} while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3);
}
#endif /* CONFIG_SERIAL_M32R_PLDSIO */
static unsigned int sio_in(struct uart_sio_port *up, int offset)
{
return __sio_in(up->port.iobase + offset);
}
static void sio_out(struct uart_sio_port *up, int offset, int value)
{
__sio_out(value, up->port.iobase + offset);
}
static unsigned int serial_in(struct uart_sio_port *up, int offset)
{
if (!offset)
return 0;
return __sio_in(offset);
}
static void serial_out(struct uart_sio_port *up, int offset, int value)
{
if (!offset)
return;
__sio_out(value, offset);
}
static void m32r_sio_stop_tx(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
if (up->ier & UART_IER_THRI) {
up->ier &= ~UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
}
static void m32r_sio_start_tx(struct uart_port *port)
{
#ifdef CONFIG_SERIAL_M32R_PLDSIO
struct uart_sio_port *up = (struct uart_sio_port *)port;
struct circ_buf *xmit = &up->port.state->xmit;
if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
serial_out(up, UART_TX, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
up->port.icount.tx++;
}
while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY);
#else
struct uart_sio_port *up = (struct uart_sio_port *)port;
if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
#endif
}
static void m32r_sio_stop_rx(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
}
static void m32r_sio_enable_ms(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
}
static void receive_chars(struct uart_sio_port *up, int *status)
{
struct tty_port *port = &up->port.state->port;
unsigned char ch;
unsigned char flag;
int max_count = 256;
do {
ch = sio_in(up, SIORXB);
flag = TTY_NORMAL;
up->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);
up->port.icount.brk++;
/*
* We do the SysRQ and SAK checking
* here because otherwise the break
* may get masked by ignore_status_mask
* or read_status_mask.
*/
if (uart_handle_break(&up->port))
goto ignore_char;
} else if (*status & UART_LSR_PE)
up->port.icount.parity++;
else if (*status & UART_LSR_FE)
up->port.icount.frame++;
if (*status & UART_LSR_OE)
up->port.icount.overrun++;
/*
* Mask off conditions which should be ingored.
*/
*status &= up->port.read_status_mask;
if (up->port.line == up->port.cons->index) {
/* Recover the break flag from console xmit */
*status |= up->lsr_break_flag;
up->lsr_break_flag = 0;
}
if (*status & UART_LSR_BI) {
DEBUG_INTR("handling break....");
flag = TTY_BREAK;
} else if (*status & UART_LSR_PE)
flag = TTY_PARITY;
else if (*status & UART_LSR_FE)
flag = TTY_FRAME;
}
if (uart_handle_sysrq_char(&up->port, ch))
goto ignore_char;
if ((*status & up->port.ignore_status_mask) == 0)
tty_insert_flip_char(port, ch, flag);
if (*status & UART_LSR_OE) {
/*
* Overrun is special, since it's reported
* immediately, and doesn't affect the current
* character.
*/
tty_insert_flip_char(port, 0, TTY_OVERRUN);
}
ignore_char:
*status = serial_in(up, UART_LSR);
} while ((*status & UART_LSR_DR) && (max_count-- > 0));
spin_unlock(&up->port.lock);
tty_flip_buffer_push(port);
spin_lock(&up->port.lock);
}
static void transmit_chars(struct uart_sio_port *up)
{
struct circ_buf *xmit = &up->port.state->xmit;
int count;
if (up->port.x_char) {
#ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */
serial_out(up, UART_TX, up->port.x_char);
#endif
up->port.icount.tx++;
up->port.x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
m32r_sio_stop_tx(&up->port);
return;
}
count = up->port.fifosize;
do {
serial_out(up, UART_TX, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
up->port.icount.tx++;
if (uart_circ_empty(xmit))
break;
while (!(serial_in(up, UART_LSR) & UART_LSR_THRE));
} while (--count > 0);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
DEBUG_INTR("THRE...");
if (uart_circ_empty(xmit))
m32r_sio_stop_tx(&up->port);
}
/*
* This handles the interrupt from one port.
*/
static inline void m32r_sio_handle_port(struct uart_sio_port *up,
unsigned int status)
{
DEBUG_INTR("status = %x...", status);
if (status & 0x04)
receive_chars(up, &status);
if (status & 0x01)
transmit_chars(up);
}
/*
* This is the serial driver's interrupt routine.
*
* Arjan thinks the old way was overly complex, so it got simplified.
* Alan disagrees, saying that need the complexity to handle the weird
* nature of ISA shared interrupts. (This is a special exception.)
*
* In order to handle ISA shared interrupts properly, we need to check
* that all ports have been serviced, and therefore the ISA interrupt
* line has been de-asserted.
*
* This means we need to loop through all ports. checking that they
* don't have an interrupt pending.
*/
static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id)
{
struct irq_info *i = dev_id;
struct list_head *l, *end = NULL;
int pass_counter = 0;
DEBUG_INTR("m32r_sio_interrupt(%d)...", irq);
#ifdef CONFIG_SERIAL_M32R_PLDSIO
// if (irq == PLD_IRQ_SIO0_SND)
// irq = PLD_IRQ_SIO0_RCV;
#else
if (irq == M32R_IRQ_SIO0_S)
irq = M32R_IRQ_SIO0_R;
#endif
spin_lock(&i->lock);
l = i->head;
do {
struct uart_sio_port *up;
unsigned int sts;
up = list_entry(l, struct uart_sio_port, list);
sts = sio_in(up, SIOSTS);
if (sts & 0x5) {
spin_lock(&up->port.lock);
m32r_sio_handle_port(up, sts);
spin_unlock(&up->port.lock);
end = NULL;
} else if (end == NULL)
end = l;
l = l->next;
if (l == i->head && pass_counter++ > PASS_LIMIT) {
if (sts & 0xe0)
sio_error(&sts);
break;
}
} while (l != end);
spin_unlock(&i->lock);
DEBUG_INTR("end.\n");
return IRQ_HANDLED;
}
/*
* To support ISA shared interrupts, we need to have one interrupt
* handler that ensures that the IRQ line has been deasserted
* before returning. Failing to do this will result in the IRQ
* line being stuck active, and, since ISA irqs are edge triggered,
* no more IRQs will be seen.
*/
static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
{
spin_lock_irq(&i->lock);
if (!list_empty(i->head)) {
if (i->head == &up->list)
i->head = i->head->next;
list_del(&up->list);
} else {
BUG_ON(i->head != &up->list);
i->head = NULL;
}
spin_unlock_irq(&i->lock);
}
static int serial_link_irq_chain(struct uart_sio_port *up)
{
struct irq_info *i = irq_lists + up->port.irq;
int ret, irq_flags = 0;
spin_lock_irq(&i->lock);
if (i->head) {
list_add(&up->list, i->head);
spin_unlock_irq(&i->lock);
ret = 0;
} else {
INIT_LIST_HEAD(&up->list);
i->head = &up->list;
spin_unlock_irq(&i->lock);
ret = request_irq(up->port.irq, m32r_sio_interrupt,
irq_flags, "SIO0-RX", i);
ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
irq_flags, "SIO0-TX", i);
if (ret < 0)
serial_do_unlink(i, up);
}
return ret;
}
static void serial_unlink_irq_chain(struct uart_sio_port *up)
{
struct irq_info *i = irq_lists + up->port.irq;
BUG_ON(i->head == NULL);
if (list_empty(i->head)) {
free_irq(up->port.irq, i);
free_irq(up->port.irq + 1, i);
}
serial_do_unlink(i, up);
}
/*
* This function is used to handle ports that do not have an interrupt.
*/
static void m32r_sio_timeout(unsigned long data)
{
struct uart_sio_port *up = (struct uart_sio_port *)data;
unsigned int timeout;
unsigned int sts;
sts = sio_in(up, SIOSTS);
if (sts & 0x5) {
spin_lock(&up->port.lock);
m32r_sio_handle_port(up, sts);
spin_unlock(&up->port.lock);
}
timeout = up->port.timeout;
timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
mod_timer(&up->timer, jiffies + timeout);
}
static unsigned int m32r_sio_tx_empty(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(&up->port.lock, flags);
ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
spin_unlock_irqrestore(&up->port.lock, flags);
return ret;
}
static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
{
return 0;
}
static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
}
static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
{
}
static int m32r_sio_startup(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
int retval;
sio_init();
/*
* If the "interrupt" for this port doesn't correspond with any
* hardware interrupt, we use a timer-based system. The original
* driver used to do this with IRQ0.
*/
if (!up->port.irq) {
unsigned int timeout = up->port.timeout;
timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
up->timer.data = (unsigned long)up;
mod_timer(&up->timer, jiffies + timeout);
} else {
retval = serial_link_irq_chain(up);
if (retval)
return retval;
}
/*
* Finally, enable interrupts. Note: Modem status interrupts
* are set via set_termios(), which will be occurring imminently
* anyway, so we don't enable them here.
* - M32R_SIO: 0x0c
* - M32R_PLDSIO: 0x04
*/
up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
sio_out(up, SIOTRCR, up->ier);
/*
* And clear the interrupt registers again for luck.
*/
sio_reset();
return 0;
}
static void m32r_sio_shutdown(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
/*
* Disable interrupts from this port
*/
up->ier = 0;
sio_out(up, SIOTRCR, 0);
/*
* Disable break condition and FIFOs
*/
sio_init();
if (!up->port.irq)
del_timer_sync(&up->timer);
else
serial_unlink_irq_chain(up);
}
static unsigned int m32r_sio_get_divisor(struct uart_port *port,
unsigned int baud)
{
return uart_get_divisor(port, baud);
}
static void m32r_sio_set_termios(struct uart_port *port,
struct ktermios *termios, struct ktermios *old)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
unsigned char cval = 0;
unsigned long flags;
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;
#ifdef CMSPAR
if (termios->c_cflag & CMSPAR)
cval |= UART_LCR_SPAR;
#endif
/*
* Ask the core to calculate the divisor for us.
*/
#ifdef CONFIG_SERIAL_M32R_PLDSIO
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
#else
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
#endif
quot = m32r_sio_get_divisor(port, baud);
/*
* Ok, we're now changing the port state. Do it with
* interrupts disabled.
*/
spin_lock_irqsave(&up->port.lock, flags);
sio_set_baud_rate(baud);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (termios->c_iflag & INPCK)
up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (termios->c_iflag & (BRKINT | PARMRK))
up->port.read_status_mask |= UART_LSR_BI;
/*
* Characteres to ignore
*/
up->port.ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
if (termios->c_iflag & IGNBRK) {
up->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)
up->port.ignore_status_mask |= UART_LSR_OE;
}
/*
* ignore all characters if CREAD is not set
*/
if ((termios->c_cflag & CREAD) == 0)
up->port.ignore_status_mask |= UART_LSR_DR;
/*
* CTS flow control flag and modem status interrupts
*/
up->ier &= ~UART_IER_MSI;
if (UART_ENABLE_MS(&up->port, termios->c_cflag))
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
up->lcr = cval; /* Save LCR */
spin_unlock_irqrestore(&up->port.lock, flags);
}
static void m32r_sio_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
if (up->pm)
up->pm(port, state, oldstate);
}
/*
* Resource handling. This is complicated by the fact that resources
* depend on the port type. Maybe we should be claiming the standard
* 8250 ports, and then trying to get other resources as necessary?
*/
static int
m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
{
unsigned int size = 8 << up->port.regshift;
#ifndef CONFIG_SERIAL_M32R_PLDSIO
unsigned long start;
#endif
int ret = 0;
switch (up->port.iotype) {
case UPIO_MEM:
if (up->port.mapbase) {
#ifdef CONFIG_SERIAL_M32R_PLDSIO
*res = request_mem_region(up->port.mapbase, size, "serial");
#else
start = up->port.mapbase;
*res = request_mem_region(start, size, "serial");
#endif
if (!*res)
ret = -EBUSY;
}
break;
case UPIO_PORT:
*res = request_region(up->port.iobase, size, "serial");
if (!*res)
ret = -EBUSY;
break;
}
return ret;
}
static void m32r_sio_release_port(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
unsigned long start, offset = 0, size = 0;
size <<= up->port.regshift;
switch (up->port.iotype) {
case UPIO_MEM:
if (up->port.mapbase) {
/*
* Unmap the area.
*/
iounmap(up->port.membase);
up->port.membase = NULL;
start = up->port.mapbase;
if (size)
release_mem_region(start + offset, size);
release_mem_region(start, 8 << up->port.regshift);
}
break;
case UPIO_PORT:
start = up->port.iobase;
if (size)
release_region(start + offset, size);
release_region(start + offset, 8 << up->port.regshift);
break;
default:
break;
}
}
static int m32r_sio_request_port(struct uart_port *port)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
struct resource *res = NULL;
int ret = 0;
ret = m32r_sio_request_std_resource(up, &res);
/*
* If we have a mapbase, then request that as well.
*/
if (ret == 0 && up->port.flags & UPF_IOREMAP) {
int size = resource_size(res);
up->port.membase = ioremap(up->port.mapbase, size);
if (!up->port.membase)
ret = -ENOMEM;
}
if (ret < 0) {
if (res)
release_resource(res);
}
return ret;
}
static void m32r_sio_config_port(struct uart_port *port, int unused)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
unsigned long flags;
spin_lock_irqsave(&up->port.lock, flags);
up->port.fifosize = 1;
spin_unlock_irqrestore(&up->port.lock, flags);
}
static int
m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
{
if (ser->irq >= nr_irqs || ser->irq < 0 || ser->baud_base < 9600)
return -EINVAL;
return 0;
}
static struct uart_ops m32r_sio_pops = {
.tx_empty = m32r_sio_tx_empty,
.set_mctrl = m32r_sio_set_mctrl,
.get_mctrl = m32r_sio_get_mctrl,
.stop_tx = m32r_sio_stop_tx,
.start_tx = m32r_sio_start_tx,
.stop_rx = m32r_sio_stop_rx,
.enable_ms = m32r_sio_enable_ms,
.break_ctl = m32r_sio_break_ctl,
.startup = m32r_sio_startup,
.shutdown = m32r_sio_shutdown,
.set_termios = m32r_sio_set_termios,
.pm = m32r_sio_pm,
.release_port = m32r_sio_release_port,
.request_port = m32r_sio_request_port,
.config_port = m32r_sio_config_port,
.verify_port = m32r_sio_verify_port,
};
static struct uart_sio_port m32r_sio_ports[UART_NR];
static void __init m32r_sio_init_ports(void)
{
struct uart_sio_port *up;
static int first = 1;
int i;
if (!first)
return;
first = 0;
for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port);
i++, up++) {
up->port.iobase = old_serial_port[i].port;
up->port.irq = irq_canonicalize(old_serial_port[i].irq);
up->port.uartclk = old_serial_port[i].baud_base * 16;
up->port.flags = old_serial_port[i].flags;
up->port.membase = old_serial_port[i].iomem_base;
up->port.iotype = old_serial_port[i].io_type;
up->port.regshift = old_serial_port[i].iomem_reg_shift;
up->port.ops = &m32r_sio_pops;
}
}
static void __init m32r_sio_register_ports(struct uart_driver *drv)
{
int i;
m32r_sio_init_ports();
for (i = 0; i < UART_NR; i++) {
struct uart_sio_port *up = &m32r_sio_ports[i];
up->port.line = i;
up->port.ops = &m32r_sio_pops;
init_timer(&up->timer);
up->timer.function = m32r_sio_timeout;
up->mcr_mask = ~0;
up->mcr_force = 0;
uart_add_one_port(drv, &up->port);
}
}
#ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
/*
* Wait for transmitter & holding register to empty
*/
static inline void wait_for_xmitr(struct uart_sio_port *up)
{
unsigned int status, tmout = 10000;
/* Wait up to 10ms for the character(s) to be sent. */
do {
status = sio_in(up, SIOSTS);
if (--tmout == 0)
break;
udelay(1);
} while ((status & UART_EMPTY) != UART_EMPTY);
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
tmout = 1000000;
while (--tmout)
udelay(1);
}
}
static void m32r_sio_console_putchar(struct uart_port *port, int ch)
{
struct uart_sio_port *up = (struct uart_sio_port *)port;
wait_for_xmitr(up);
sio_out(up, SIOTXB, ch);
}
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*
* The console_lock must be held when we get here.
*/
static void m32r_sio_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_sio_port *up = &m32r_sio_ports[co->index];
unsigned int ier;
/*
* First save the UER then disable the interrupts
*/
ier = sio_in(up, SIOTRCR);
sio_out(up, SIOTRCR, 0);
uart_console_write(&up->port, s, count, m32r_sio_console_putchar);
/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(up);
sio_out(up, SIOTRCR, ier);
}
static int __init m32r_sio_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
/*
* Check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index >= UART_NR)
co->index = 0;
port = &m32r_sio_ports[co->index].port;
/*
* Temporary fix.
*/
spin_lock_init(&port->lock);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver m32r_sio_reg;
static struct console m32r_sio_console = {
.name = "ttyS",
.write = m32r_sio_console_write,
.device = uart_console_device,
.setup = m32r_sio_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &m32r_sio_reg,
};
static int __init m32r_sio_console_init(void)
{
sio_reset();
sio_init();
m32r_sio_init_ports();
register_console(&m32r_sio_console);
return 0;
}
console_initcall(m32r_sio_console_init);
#define M32R_SIO_CONSOLE &m32r_sio_console
#else
#define M32R_SIO_CONSOLE NULL
#endif
static struct uart_driver m32r_sio_reg = {
.owner = THIS_MODULE,
.driver_name = "sio",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = UART_NR,
.cons = M32R_SIO_CONSOLE,
};
/**
* m32r_sio_suspend_port - suspend one serial port
* @line: serial line number
*
* Suspend one serial port.
*/
void m32r_sio_suspend_port(int line)
{
uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
}
/**
* m32r_sio_resume_port - resume one serial port
* @line: serial line number
*
* Resume one serial port.
*/
void m32r_sio_resume_port(int line)
{
uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
}
static int __init m32r_sio_init(void)
{
int ret, i;
printk(KERN_INFO "Serial: M32R SIO driver\n");
for (i = 0; i < nr_irqs; i++)
spin_lock_init(&irq_lists[i].lock);
ret = uart_register_driver(&m32r_sio_reg);
if (ret >= 0)
m32r_sio_register_ports(&m32r_sio_reg);
return ret;
}
static void __exit m32r_sio_exit(void)
{
int i;
for (i = 0; i < UART_NR; i++)
uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port);
uart_unregister_driver(&m32r_sio_reg);
}
module_init(m32r_sio_init);
module_exit(m32r_sio_exit);
EXPORT_SYMBOL(m32r_sio_suspend_port);
EXPORT_SYMBOL(m32r_sio_resume_port);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic M32R SIO serial driver");