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linux/drivers/serial/sh-sci.c
Russell King b129a8ccd5 [SERIAL] Clean up and fix tty transmission start/stoping 
The start_tx and stop_tx methods were passed a flag to indicate
whether the start/stop was from the tty start/stop callbacks, and
some drivers used this flag to decide whether to ask the UART to
immediately stop transmission (where the UART supports such a
feature.)

There are other cases when we wish this to occur - when CTS is
lowered, or if we change from soft to hard flow control and CTS
is inactive.  In these cases, this flag was false, and we would
allow the transmitter to drain before stopping.

There is really only one case where we want to let the transmitter
drain before disabling, and that's when we run out of characters
to send.

Hence, re-jig the start_tx and stop_tx methods to eliminate this
flag, and introduce new functions for the special "disable and
allow transmitter to drain" case.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-08-31 10:12:14 +01:00

1693 lines
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/*
* drivers/serial/sh-sci.c
*
* SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
*
* Copyright (C) 2002, 2003, 2004 Paul Mundt
*
* based off of the old drivers/char/sh-sci.c by:
*
* Copyright (C) 1999, 2000 Niibe Yutaka
* Copyright (C) 2000 Sugioka Toshinobu
* Modified to support multiple serial ports. Stuart Menefy (May 2000).
* Modified to support SecureEdge. David McCullough (2002)
* Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#undef DEBUG
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/sysrq.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/console.h>
#include <linux/bitops.h>
#ifdef CONFIG_CPU_FREQ
#include <linux/notifier.h>
#include <linux/cpufreq.h>
#endif
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <linux/generic_serial.h>
#ifdef CONFIG_SH_STANDARD_BIOS
#include <asm/sh_bios.h>
#endif
#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include "sh-sci.h"
#ifdef CONFIG_SH_KGDB
#include <asm/kgdb.h>
static int kgdb_get_char(struct sci_port *port);
static void kgdb_put_char(struct sci_port *port, char c);
static void kgdb_handle_error(struct sci_port *port);
static struct sci_port *kgdb_sci_port;
#endif /* CONFIG_SH_KGDB */
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
static struct sci_port *serial_console_port = 0;
#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
/* Function prototypes */
static void sci_stop_tx(struct uart_port *port);
static void sci_start_tx(struct uart_port *port);
static void sci_start_rx(struct uart_port *port, unsigned int tty_start);
static void sci_stop_rx(struct uart_port *port);
static int sci_request_irq(struct sci_port *port);
static void sci_free_irq(struct sci_port *port);
static struct sci_port sci_ports[SCI_NPORTS];
static struct uart_driver sci_uart_driver;
#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
static void handle_error(struct uart_port *port)
{ /* Clear error flags */
sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
}
static int get_char(struct uart_port *port)
{
unsigned long flags;
unsigned short status;
int c;
local_irq_save(flags);
do {
status = sci_in(port, SCxSR);
if (status & SCxSR_ERRORS(port)) {
handle_error(port);
continue;
}
} while (!(status & SCxSR_RDxF(port)));
c = sci_in(port, SCxRDR);
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
local_irq_restore(flags);
return c;
}
/* Taken from sh-stub.c of GDB 4.18 */
static const char hexchars[] = "0123456789abcdef";
static __inline__ char highhex(int x)
{
return hexchars[(x >> 4) & 0xf];
}
static __inline__ char lowhex(int x)
{
return hexchars[x & 0xf];
}
#endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
/*
* Send the packet in buffer. The host gets one chance to read it.
* This routine does not wait for a positive acknowledge.
*/
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
static void put_char(struct uart_port *port, char c)
{
unsigned long flags;
unsigned short status;
local_irq_save(flags);
do {
status = sci_in(port, SCxSR);
} while (!(status & SCxSR_TDxE(port)));
sci_out(port, SCxTDR, c);
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
local_irq_restore(flags);
}
static void put_string(struct sci_port *sci_port, const char *buffer, int count)
{
struct uart_port *port = &sci_port->port;
const unsigned char *p = buffer;
int i;
#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
int checksum;
int usegdb=0;
#ifdef CONFIG_SH_STANDARD_BIOS
/* This call only does a trap the first time it is
* called, and so is safe to do here unconditionally
*/
usegdb |= sh_bios_in_gdb_mode();
#endif
#ifdef CONFIG_SH_KGDB
usegdb |= (kgdb_in_gdb_mode && (port == kgdb_sci_port));
#endif
if (usegdb) {
/* $<packet info>#<checksum>. */
do {
unsigned char c;
put_char(port, '$');
put_char(port, 'O'); /* 'O'utput to console */
checksum = 'O';
for (i=0; i<count; i++) { /* Don't use run length encoding */
int h, l;
c = *p++;
h = highhex(c);
l = lowhex(c);
put_char(port, h);
put_char(port, l);
checksum += h + l;
}
put_char(port, '#');
put_char(port, highhex(checksum));
put_char(port, lowhex(checksum));
} while (get_char(port) != '+');
} else
#endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
for (i=0; i<count; i++) {
if (*p == 10)
put_char(port, '\r');
put_char(port, *p++);
}
}
#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
#ifdef CONFIG_SH_KGDB
/* Is the SCI ready, ie is there a char waiting? */
static int kgdb_is_char_ready(struct sci_port *port)
{
unsigned short status = sci_in(port, SCxSR);
if (status & (SCxSR_ERRORS(port) | SCxSR_BRK(port)))
kgdb_handle_error(port);
return (status & SCxSR_RDxF(port));
}
/* Write a char */
static void kgdb_put_char(struct sci_port *port, char c)
{
unsigned short status;
do
status = sci_in(port, SCxSR);
while (!(status & SCxSR_TDxE(port)));
sci_out(port, SCxTDR, c);
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
}
/* Get a char if there is one, else ret -1 */
static int kgdb_get_char(struct sci_port *port)
{
int c;
if (kgdb_is_char_ready(port) == 0)
c = -1;
else {
c = sci_in(port, SCxRDR);
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
}
return c;
}
/* Called from kgdbstub.c to get a character, i.e. is blocking */
static int kgdb_sci_getchar(void)
{
volatile int c;
/* Keep trying to read a character, this could be neater */
while ((c = kgdb_get_char(kgdb_sci_port)) < 0);
return c;
}
/* Called from kgdbstub.c to put a character, just a wrapper */
static void kgdb_sci_putchar(int c)
{
kgdb_put_char(kgdb_sci_port, c);
}
/* Clear any errors on the SCI */
static void kgdb_handle_error(struct sci_port *port)
{
sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); /* Clear error flags */
}
/* Breakpoint if there's a break sent on the serial port */
static void kgdb_break_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
struct sci_port *port = ptr;
unsigned short status = sci_in(port, SCxSR);
if (status & SCxSR_BRK(port)) {
/* Break into the debugger if a break is detected */
BREAKPOINT();
/* Clear */
sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
}
}
#endif /* CONFIG_SH_KGDB */
#if defined(__H8300S__)
enum { sci_disable, sci_enable };
static void h8300_sci_enable(struct uart_port* port, unsigned int ctrl)
{
volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
int ch = (port->mapbase - SMR0) >> 3;
unsigned char mask = 1 << (ch+1);
if (ctrl == sci_disable) {
*mstpcrl |= mask;
} else {
*mstpcrl &= ~mask;
}
}
#endif
#if defined(SCI_ONLY) || defined(SCI_AND_SCIF)
#if defined(__H8300H__) || defined(__H8300S__)
static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
{
int ch = (port->mapbase - SMR0) >> 3;
/* set DDR regs */
H8300_GPIO_DDR(h8300_sci_pins[ch].port,h8300_sci_pins[ch].rx,H8300_GPIO_INPUT);
H8300_GPIO_DDR(h8300_sci_pins[ch].port,h8300_sci_pins[ch].tx,H8300_GPIO_OUTPUT);
/* tx mark output*/
H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
}
#else
static void sci_init_pins_sci(struct uart_port *port, unsigned int cflag)
{
}
#endif
#endif
#if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
#if defined(CONFIG_CPU_SH3)
/* For SH7705, SH7707, SH7709, SH7709A, SH7729, SH7300*/
static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
{
unsigned int fcr_val = 0;
#if !defined(CONFIG_CPU_SUBTYPE_SH7300) /* SH7300 doesn't use RTS/CTS */
{
unsigned short data;
/* We need to set SCPCR to enable RTS/CTS */
data = ctrl_inw(SCPCR);
/* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
ctrl_outw(data&0x0fcf, SCPCR);
}
if (cflag & CRTSCTS)
fcr_val |= SCFCR_MCE;
else {
unsigned short data;
/* We need to set SCPCR to enable RTS/CTS */
data = ctrl_inw(SCPCR);
/* Clear out SCP7MD1,0, SCP4MD1,0,
Set SCP6MD1,0 = {01} (output) */
ctrl_outw((data&0x0fcf)|0x1000, SCPCR);
data = ctrl_inb(SCPDR);
/* Set /RTS2 (bit6) = 0 */
ctrl_outb(data&0xbf, SCPDR);
}
#endif
sci_out(port, SCFCR, fcr_val);
}
static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
{
unsigned int fcr_val = 0;
if (cflag & CRTSCTS)
fcr_val |= SCFCR_MCE;
sci_out(port, SCFCR, fcr_val);
}
#else
/* For SH7750 */
static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
{
unsigned int fcr_val = 0;
if (cflag & CRTSCTS) {
fcr_val |= SCFCR_MCE;
} else {
ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
}
sci_out(port, SCFCR, fcr_val);
}
#endif
#endif /* SCIF_ONLY || SCI_AND_SCIF */
/* ********************************************************************** *
* the interrupt related routines *
* ********************************************************************** */
static void sci_transmit_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->info->xmit;
unsigned int stopped = uart_tx_stopped(port);
unsigned long flags;
unsigned short status;
unsigned short ctrl;
int count, txroom;
status = sci_in(port, SCxSR);
if (!(status & SCxSR_TDxE(port))) {
local_irq_save(flags);
ctrl = sci_in(port, SCSCR);
if (uart_circ_empty(xmit)) {
ctrl &= ~SCI_CTRL_FLAGS_TIE;
} else {
ctrl |= SCI_CTRL_FLAGS_TIE;
}
sci_out(port, SCSCR, ctrl);
local_irq_restore(flags);
return;
}
#if !defined(SCI_ONLY)
if (port->type == PORT_SCIF) {
txroom = SCIF_TXROOM_MAX - (sci_in(port, SCFDR)>>8);
} else {
txroom = (sci_in(port, SCxSR) & SCI_TDRE)?1:0;
}
#else
txroom = (sci_in(port, SCxSR) & SCI_TDRE)?1:0;
#endif
count = txroom;
do {
unsigned char c;
if (port->x_char) {
c = port->x_char;
port->x_char = 0;
} else if (!uart_circ_empty(xmit) && !stopped) {
c = xmit->buf[xmit->tail];
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
} else {
break;
}
sci_out(port, SCxTDR, c);
port->icount.tx++;
} while (--count > 0);
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit)) {
sci_stop_tx(port);
} else {
local_irq_save(flags);
ctrl = sci_in(port, SCSCR);
#if !defined(SCI_ONLY)
if (port->type == PORT_SCIF) {
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
}
#endif
ctrl |= SCI_CTRL_FLAGS_TIE;
sci_out(port, SCSCR, ctrl);
local_irq_restore(flags);
}
}
/* On SH3, SCIF may read end-of-break as a space->mark char */
#define STEPFN(c) ({int __c=(c); (((__c-1)|(__c)) == -1); })
static inline void sci_receive_chars(struct uart_port *port,
struct pt_regs *regs)
{
struct tty_struct *tty = port->info->tty;
int i, count, copied = 0;
unsigned short status;
status = sci_in(port, SCxSR);
if (!(status & SCxSR_RDxF(port)))
return;
while (1) {
#if !defined(SCI_ONLY)
if (port->type == PORT_SCIF) {
count = sci_in(port, SCFDR)&SCIF_RFDC_MASK ;
} else {
count = (sci_in(port, SCxSR)&SCxSR_RDxF(port))?1:0;
}
#else
count = (sci_in(port, SCxSR)&SCxSR_RDxF(port))?1:0;
#endif
/* Don't copy more bytes than there is room for in the buffer */
if (tty->flip.count + count > TTY_FLIPBUF_SIZE)
count = TTY_FLIPBUF_SIZE - tty->flip.count;
/* If for any reason we can't copy more data, we're done! */
if (count == 0)
break;
if (port->type == PORT_SCI) {
char c = sci_in(port, SCxRDR);
if(((struct sci_port *)port)->break_flag
|| uart_handle_sysrq_char(port, c, regs)) {
count = 0;
} else {
tty->flip.char_buf_ptr[0] = c;
tty->flip.flag_buf_ptr[0] = TTY_NORMAL;
}
} else {
for (i=0; i<count; i++) {
char c = sci_in(port, SCxRDR);
status = sci_in(port, SCxSR);
#if defined(CONFIG_CPU_SH3)
/* Skip "chars" during break */
if (((struct sci_port *)port)->break_flag) {
if ((c == 0) &&
(status & SCxSR_FER(port))) {
count--; i--;
continue;
}
/* Nonzero => end-of-break */
pr_debug("scif: debounce<%02x>\n", c);
((struct sci_port *)port)->break_flag = 0;
if (STEPFN(c)) {
count--; i--;
continue;
}
}
#endif /* CONFIG_CPU_SH3 */
if (uart_handle_sysrq_char(port, c, regs)) {
count--; i--;
continue;
}
/* Store data and status */
tty->flip.char_buf_ptr[i] = c;
if (status&SCxSR_FER(port)) {
tty->flip.flag_buf_ptr[i] = TTY_FRAME;
pr_debug("sci: frame error\n");
} else if (status&SCxSR_PER(port)) {
tty->flip.flag_buf_ptr[i] = TTY_PARITY;
pr_debug("sci: parity error\n");
} else {
tty->flip.flag_buf_ptr[i] = TTY_NORMAL;
}
}
}
sci_in(port, SCxSR); /* dummy read */
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
/* Update the kernel buffer end */
tty->flip.count += count;
tty->flip.char_buf_ptr += count;
tty->flip.flag_buf_ptr += count;
copied += count;
port->icount.rx += count;
}
if (copied) {
/* Tell the rest of the system the news. New characters! */
tty_flip_buffer_push(tty);
} else {
sci_in(port, SCxSR); /* dummy read */
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
}
}
#define SCI_BREAK_JIFFIES (HZ/20)
/* The sci generates interrupts during the break,
* 1 per millisecond or so during the break period, for 9600 baud.
* So dont bother disabling interrupts.
* But dont want more than 1 break event.
* Use a kernel timer to periodically poll the rx line until
* the break is finished.
*/
static void sci_schedule_break_timer(struct sci_port *port)
{
port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
add_timer(&port->break_timer);
}
/* Ensure that two consecutive samples find the break over. */
static void sci_break_timer(unsigned long data)
{
struct sci_port * port = (struct sci_port *)data;
if(sci_rxd_in(&port->port) == 0) {
port->break_flag = 1;
sci_schedule_break_timer(port);
} else if(port->break_flag == 1){
/* break is over. */
port->break_flag = 2;
sci_schedule_break_timer(port);
} else port->break_flag = 0;
}
static inline int sci_handle_errors(struct uart_port *port)
{
int copied = 0;
unsigned short status = sci_in(port, SCxSR);
struct tty_struct *tty = port->info->tty;
if (status&SCxSR_ORER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
/* overrun error */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
pr_debug("sci: overrun error\n");
}
if (status&SCxSR_FER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
if (sci_rxd_in(port) == 0) {
/* Notify of BREAK */
struct sci_port * sci_port = (struct sci_port *)port;
if(!sci_port->break_flag) {
sci_port->break_flag = 1;
sci_schedule_break_timer((struct sci_port *)port);
/* Do sysrq handling. */
if(uart_handle_break(port)) {
return 0;
}
pr_debug("sci: BREAK detected\n");
copied++;
*tty->flip.flag_buf_ptr++ = TTY_BREAK;
}
}
else {
/* frame error */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_FRAME;
pr_debug("sci: frame error\n");
}
}
if (status&SCxSR_PER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
/* parity error */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_PARITY;
pr_debug("sci: parity error\n");
}
if (copied) {
tty->flip.count += copied;
tty_flip_buffer_push(tty);
}
return copied;
}
static inline int sci_handle_breaks(struct uart_port *port)
{
int copied = 0;
unsigned short status = sci_in(port, SCxSR);
struct tty_struct *tty = port->info->tty;
struct sci_port *s = &sci_ports[port->line];
if (!s->break_flag && status & SCxSR_BRK(port) &&
tty->flip.count < TTY_FLIPBUF_SIZE) {
#if defined(CONFIG_CPU_SH3)
/* Debounce break */
s->break_flag = 1;
#endif
/* Notify of BREAK */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_BREAK;
pr_debug("sci: BREAK detected\n");
}
#if defined(SCIF_ORER)
/* XXX: Handle SCIF overrun error */
if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
sci_out(port, SCLSR, 0);
if(tty->flip.count<TTY_FLIPBUF_SIZE) {
copied++;
*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
pr_debug("sci: overrun error\n");
}
}
#endif
if (copied) {
tty->flip.count += copied;
tty_flip_buffer_push(tty);
}
return copied;
}
static irqreturn_t sci_rx_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
struct uart_port *port = ptr;
/* I think sci_receive_chars has to be called irrespective
* of whether the I_IXOFF is set, otherwise, how is the interrupt
* to be disabled?
*/
sci_receive_chars(port, regs);
return IRQ_HANDLED;
}
static irqreturn_t sci_tx_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
struct uart_port *port = ptr;
sci_transmit_chars(port);
return IRQ_HANDLED;
}
static irqreturn_t sci_er_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
struct uart_port *port = ptr;
/* Handle errors */
if (port->type == PORT_SCI) {
if (sci_handle_errors(port)) {
/* discard character in rx buffer */
sci_in(port, SCxSR);
sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
}
} else {
#if defined(SCIF_ORER)
if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
struct tty_struct *tty = port->info->tty;
sci_out(port, SCLSR, 0);
if(tty->flip.count<TTY_FLIPBUF_SIZE) {
*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
tty->flip.count++;
tty_flip_buffer_push(tty);
pr_debug("scif: overrun error\n");
}
}
#endif
sci_rx_interrupt(irq, ptr, regs);
}
sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
/* Kick the transmission */
sci_tx_interrupt(irq, ptr, regs);
return IRQ_HANDLED;
}
static irqreturn_t sci_br_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
struct uart_port *port = ptr;
/* Handle BREAKs */
sci_handle_breaks(port);
sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
return IRQ_HANDLED;
}
static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
unsigned short ssr_status, scr_status;
struct uart_port *port = ptr;
ssr_status = sci_in(port,SCxSR);
scr_status = sci_in(port,SCSCR);
/* Tx Interrupt */
if ((ssr_status&0x0020) && (scr_status&0x0080))
sci_tx_interrupt(irq, ptr, regs);
/* Rx Interrupt */
if ((ssr_status&0x0002) && (scr_status&0x0040))
sci_rx_interrupt(irq, ptr, regs);
/* Error Interrupt */
if ((ssr_status&0x0080) && (scr_status&0x0400))
sci_er_interrupt(irq, ptr, regs);
/* Break Interrupt */
if ((ssr_status&0x0010) && (scr_status&0x0200))
sci_br_interrupt(irq, ptr, regs);
return IRQ_HANDLED;
}
#ifdef CONFIG_CPU_FREQ
/*
* Here we define a transistion notifier so that we can update all of our
* ports' baud rate when the peripheral clock changes.
*/
static int sci_notifier(struct notifier_block *self, unsigned long phase, void *p)
{
struct cpufreq_freqs *freqs = p;
int i;
if ((phase == CPUFREQ_POSTCHANGE) ||
(phase == CPUFREQ_RESUMECHANGE)){
for (i = 0; i < SCI_NPORTS; i++) {
struct uart_port *port = &sci_ports[i].port;
/*
* Update the uartclk per-port if frequency has
* changed, since it will no longer necessarily be
* consistent with the old frequency.
*
* Really we want to be able to do something like
* uart_change_speed() or something along those lines
* here to implicitly reset the per-port baud rate..
*
* Clean this up later..
*/
port->uartclk = current_cpu_data.module_clock * 16;
}
printk("%s: got a postchange notification for cpu %d (old %d, new %d)\n",
__FUNCTION__, freqs->cpu, freqs->old, freqs->new);
}
return NOTIFY_OK;
}
static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
#endif /* CONFIG_CPU_FREQ */
static int sci_request_irq(struct sci_port *port)
{
int i;
irqreturn_t (*handlers[4])(int irq, void *ptr, struct pt_regs *regs) = {
sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
sci_br_interrupt,
};
const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
"SCI Transmit Data Empty", "SCI Break" };
if (port->irqs[0] == port->irqs[1]) {
if (!port->irqs[0]) {
printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
return -ENODEV;
}
if (request_irq(port->irqs[0], sci_mpxed_interrupt, SA_INTERRUPT,
"sci", port)) {
printk(KERN_ERR "sci: Cannot allocate irq.\n");
return -ENODEV;
}
} else {
for (i = 0; i < ARRAY_SIZE(handlers); i++) {
if (!port->irqs[i])
continue;
if (request_irq(port->irqs[i], handlers[i], SA_INTERRUPT,
desc[i], port)) {
printk(KERN_ERR "sci: Cannot allocate irq.\n");
return -ENODEV;
}
}
}
return 0;
}
static void sci_free_irq(struct sci_port *port)
{
int i;
if (port->irqs[0] == port->irqs[1]) {
if (!port->irqs[0])
printk("sci: sci_free_irq error\n");
else
free_irq(port->irqs[0], port);
} else {
for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
if (!port->irqs[i])
continue;
free_irq(port->irqs[i], port);
}
}
}
static unsigned int sci_tx_empty(struct uart_port *port)
{
/* Can't detect */
return TIOCSER_TEMT;
}
static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
/* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
/* If you have signals for DTR and DCD, please implement here. */
}
static unsigned int sci_get_mctrl(struct uart_port *port)
{
/* This routine is used for geting signals of: DTR, DCD, DSR, RI,
and CTS/RTS */
return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
}
static void sci_start_tx(struct uart_port *port)
{
struct sci_port *s = &sci_ports[port->line];
disable_irq(s->irqs[SCIx_TXI_IRQ]);
sci_transmit_chars(port);
enable_irq(s->irqs[SCIx_TXI_IRQ]);
}
static void sci_stop_tx(struct uart_port *port)
{
unsigned long flags;
unsigned short ctrl;
/* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
local_irq_save(flags);
ctrl = sci_in(port, SCSCR);
ctrl &= ~SCI_CTRL_FLAGS_TIE;
sci_out(port, SCSCR, ctrl);
local_irq_restore(flags);
}
static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
{
unsigned long flags;
unsigned short ctrl;
/* Set RIE (Receive Interrupt Enable) bit in SCSCR */
local_irq_save(flags);
ctrl = sci_in(port, SCSCR);
ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
sci_out(port, SCSCR, ctrl);
local_irq_restore(flags);
}
static void sci_stop_rx(struct uart_port *port)
{
unsigned long flags;
unsigned short ctrl;
/* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
local_irq_save(flags);
ctrl = sci_in(port, SCSCR);
ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
sci_out(port, SCSCR, ctrl);
local_irq_restore(flags);
}
static void sci_enable_ms(struct uart_port *port)
{
/* Nothing here yet .. */
}
static void sci_break_ctl(struct uart_port *port, int break_state)
{
/* Nothing here yet .. */
}
static int sci_startup(struct uart_port *port)
{
struct sci_port *s = &sci_ports[port->line];
#if defined(__H8300S__)
h8300_sci_enable(port, sci_enable);
#endif
sci_request_irq(s);
sci_start_tx(port, 1);
sci_start_rx(port, 1);
return 0;
}
static void sci_shutdown(struct uart_port *port)
{
struct sci_port *s = &sci_ports[port->line];
sci_stop_rx(port);
sci_stop_tx(port);
sci_free_irq(s);
#if defined(__H8300S__)
h8300_sci_enable(port, sci_disable);
#endif
}
static void sci_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
struct sci_port *s = &sci_ports[port->line];
unsigned int status, baud, smr_val;
unsigned long flags;
int t;
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
spin_lock_irqsave(&port->lock, flags);
do {
status = sci_in(port, SCxSR);
} while (!(status & SCxSR_TEND(port)));
sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
#if !defined(SCI_ONLY)
if (port->type == PORT_SCIF) {
sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
}
#endif
smr_val = sci_in(port, SCSMR) & 3;
if ((termios->c_cflag & CSIZE) == CS7)
smr_val |= 0x40;
if (termios->c_cflag & PARENB)
smr_val |= 0x20;
if (termios->c_cflag & PARODD)
smr_val |= 0x30;
if (termios->c_cflag & CSTOPB)
smr_val |= 0x08;
uart_update_timeout(port, termios->c_cflag, baud);
sci_out(port, SCSMR, smr_val);
switch (baud) {
case 0: t = -1; break;
case 2400: t = BPS_2400; break;
case 4800: t = BPS_4800; break;
case 9600: t = BPS_9600; break;
case 19200: t = BPS_19200; break;
case 38400: t = BPS_38400; break;
case 57600: t = BPS_57600; break;
case 115200: t = BPS_115200; break;
default: t = SCBRR_VALUE(baud); break;
}
if (t > 0) {
if(t >= 256) {
sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
t >>= 2;
} else {
sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
}
sci_out(port, SCBRR, t);
udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
}
s->init_pins(port, termios->c_cflag);
sci_out(port, SCSCR, SCSCR_INIT(port));
if ((termios->c_cflag & CREAD) != 0)
sci_start_rx(port,0);
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *sci_type(struct uart_port *port)
{
switch (port->type) {
case PORT_SCI: return "sci";
case PORT_SCIF: return "scif";
case PORT_IRDA: return "irda";
}
return 0;
}
static void sci_release_port(struct uart_port *port)
{
/* Nothing here yet .. */
}
static int sci_request_port(struct uart_port *port)
{
/* Nothing here yet .. */
return 0;
}
static void sci_config_port(struct uart_port *port, int flags)
{
struct sci_port *s = &sci_ports[port->line];
port->type = s->type;
#if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
if (port->mapbase == 0)
port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
port->membase = (void *)port->mapbase;
#endif
}
static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
{
struct sci_port *s = &sci_ports[port->line];
if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
return -EINVAL;
if (ser->baud_base < 2400)
/* No paper tape reader for Mitch.. */
return -EINVAL;
return 0;
}
static struct uart_ops sci_uart_ops = {
.tx_empty = sci_tx_empty,
.set_mctrl = sci_set_mctrl,
.get_mctrl = sci_get_mctrl,
.start_tx = sci_start_tx,
.stop_tx = sci_stop_tx,
.stop_rx = sci_stop_rx,
.enable_ms = sci_enable_ms,
.break_ctl = sci_break_ctl,
.startup = sci_startup,
.shutdown = sci_shutdown,
.set_termios = sci_set_termios,
.type = sci_type,
.release_port = sci_release_port,
.request_port = sci_request_port,
.config_port = sci_config_port,
.verify_port = sci_verify_port,
};
static struct sci_port sci_ports[SCI_NPORTS] = {
#if defined(CONFIG_CPU_SUBTYPE_SH7708)
{
.port = {
.membase = (void *)0xfffffe80,
.mapbase = 0xfffffe80,
.iotype = SERIAL_IO_MEM,
.irq = 25,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCI,
.irqs = SCI_IRQS,
.init_pins = sci_init_pins_sci,
},
#elif defined(CONFIG_CPU_SUBTYPE_SH7705)
{
.port = {
.membase = (void *)SCIF0,
.mapbase = SCIF0,
.iotype = SERIAL_IO_MEM,
.irq = 55,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = SH3_IRDA_IRQS,
.init_pins = sci_init_pins_scif,
},
{
.port = {
.membase = (void *)SCIF2,
.mapbase = SCIF2,
.iotype = SERIAL_IO_MEM,
.irq = 59,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.type = PORT_SCIF,
.irqs = SH3_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
{
.port = {
.membase = (void *)0xfffffe80,
.mapbase = 0xfffffe80,
.iotype = SERIAL_IO_MEM,
.irq = 25,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCI,
.irqs = SCI_IRQS,
.init_pins = sci_init_pins_sci,
},
{
.port = {
.membase = (void *)0xa4000150,
.mapbase = 0xa4000150,
.iotype = SERIAL_IO_MEM,
.irq = 59,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.type = PORT_SCIF,
.irqs = SH3_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
},
{
.port = {
.membase = (void *)0xa4000140,
.mapbase = 0xa4000140,
.iotype = SERIAL_IO_MEM,
.irq = 55,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 2,
},
.type = PORT_IRDA,
.irqs = SH3_IRDA_IRQS,
.init_pins = sci_init_pins_irda,
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7300)
{
.port = {
.membase = (void *)0xA4430000,
.mapbase = 0xA4430000,
.iotype = SERIAL_IO_MEM,
.irq = 25,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = SH7300_SCIF0_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_CPU_SUBTYPE_SH73180)
{
.port = {
.membase = (void *)0xffe00000,
.mapbase = 0xffe00000,
.iotype = SERIAL_IO_MEM,
.irq = 25,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = SH73180_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_SH_RTS7751R2D)
{
.port = {
.membase = (void *)0xffe80000,
.mapbase = 0xffe80000,
.iotype = SERIAL_IO_MEM,
.irq = 43,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = SH4_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_CPU_SUBTYPE_SH7750) || defined(CONFIG_CPU_SUBTYPE_SH7751)
{
.port = {
.membase = (void *)0xffe00000,
.mapbase = 0xffe00000,
.iotype = SERIAL_IO_MEM,
.irq = 25,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCI,
.irqs = SCI_IRQS,
.init_pins = sci_init_pins_sci,
},
{
.port = {
.membase = (void *)0xffe80000,
.mapbase = 0xffe80000,
.iotype = SERIAL_IO_MEM,
.irq = 43,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.type = PORT_SCIF,
.irqs = SH4_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_CPU_SUBTYPE_SH7760)
{
.port = {
.membase = (void *)0xfe600000,
.mapbase = 0xfe600000,
.iotype = SERIAL_IO_MEM,
.irq = 55,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = SH7760_SCIF0_IRQS,
.init_pins = sci_init_pins_scif,
},
{
.port = {
.membase = (void *)0xfe610000,
.mapbase = 0xfe610000,
.iotype = SERIAL_IO_MEM,
.irq = 75,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.type = PORT_SCIF,
.irqs = SH7760_SCIF1_IRQS,
.init_pins = sci_init_pins_scif,
},
{
.port = {
.membase = (void *)0xfe620000,
.mapbase = 0xfe620000,
.iotype = SERIAL_IO_MEM,
.irq = 79,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 2,
},
.type = PORT_SCIF,
.irqs = SH7760_SCIF2_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_CPU_SUBTYPE_SH4_202)
{
.port = {
.membase = (void *)0xffe80000,
.mapbase = 0xffe80000,
.iotype = SERIAL_IO_MEM,
.irq = 43,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = SH4_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_CPU_SUBTYPE_ST40STB1)
{
.port = {
.membase = (void *)0xffe00000,
.mapbase = 0xffe00000,
.iotype = SERIAL_IO_MEM,
.irq = 26,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = STB1_SCIF1_IRQS,
.init_pins = sci_init_pins_scif,
},
{
.port = {
.membase = (void *)0xffe80000,
.mapbase = 0xffe80000,
.iotype = SERIAL_IO_MEM,
.irq = 43,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.type = PORT_SCIF,
.irqs = SH4_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
{
.port = {
.iotype = SERIAL_IO_MEM,
.irq = 42,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCIF,
.irqs = SH5_SCIF_IRQS,
.init_pins = sci_init_pins_scif,
},
#elif defined(CONFIG_H83007) || defined(CONFIG_H83068)
{
.port = {
.membase = (void *)0x00ffffb0,
.mapbase = 0x00ffffb0,
.iotype = SERIAL_IO_MEM,
.irq = 54,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCI,
.irqs = H8300H_SCI_IRQS0,
.init_pins = sci_init_pins_sci,
},
{
.port = {
.membase = (void *)0x00ffffb8,
.mapbase = 0x00ffffb8,
.iotype = SERIAL_IO_MEM,
.irq = 58,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.type = PORT_SCI,
.irqs = H8300H_SCI_IRQS1,
.init_pins = sci_init_pins_sci,
},
{
.port = {
.membase = (void *)0x00ffffc0,
.mapbase = 0x00ffffc0,
.iotype = SERIAL_IO_MEM,
.irq = 62,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 2,
},
.type = PORT_SCI,
.irqs = H8300H_SCI_IRQS2,
.init_pins = sci_init_pins_sci,
},
#elif defined(CONFIG_H8S2678)
{
.port = {
.membase = (void *)0x00ffff78,
.mapbase = 0x00ffff78,
.iotype = SERIAL_IO_MEM,
.irq = 90,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.type = PORT_SCI,
.irqs = H8S_SCI_IRQS0,
.init_pins = sci_init_pins_sci,
},
{
.port = {
.membase = (void *)0x00ffff80,
.mapbase = 0x00ffff80,
.iotype = SERIAL_IO_MEM,
.irq = 94,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.type = PORT_SCI,
.irqs = H8S_SCI_IRQS1,
.init_pins = sci_init_pins_sci,
},
{
.port = {
.membase = (void *)0x00ffff88,
.mapbase = 0x00ffff88,
.iotype = SERIAL_IO_MEM,
.irq = 98,
.ops = &sci_uart_ops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 2,
},
.type = PORT_SCI,
.irqs = H8S_SCI_IRQS2,
.init_pins = sci_init_pins_sci,
},
#else
#error "CPU subtype not defined"
#endif
};
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*/
static void serial_console_write(struct console *co, const char *s,
unsigned count)
{
put_string(serial_console_port, s, count);
}
static int __init serial_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
if (co->index >= SCI_NPORTS)
co->index = 0;
serial_console_port = &sci_ports[co->index];
port = &serial_console_port->port;
port->type = serial_console_port->type;
#ifdef CONFIG_SUPERH64
/* This is especially needed on sh64 to remap the SCIF */
sci_config_port(port, 0);
#endif
/*
* We need to set the initial uartclk here, since otherwise it will
* only ever be setup at sci_init() time.
*/
#if !defined(__H8300H__) && !defined(__H8300S__)
port->uartclk = current_cpu_data.module_clock * 16;
#else
port->uartclk = CONFIG_CPU_CLOCK;
#endif
#if defined(__H8300S__)
h8300_sci_enable(port, sci_enable);
#endif
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
ret = uart_set_options(port, co, baud, parity, bits, flow);
#if defined(__H8300H__) || defined(__H8300S__)
/* disable rx interrupt */
if (ret == 0)
sci_stop_rx(port);
#endif
return ret;
}
static struct console serial_console = {
.name = "ttySC",
.device = uart_console_device,
.write = serial_console_write,
.setup = serial_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &sci_uart_driver,
};
static int __init sci_console_init(void)
{
register_console(&serial_console);
return 0;
}
console_initcall(sci_console_init);
#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
#ifdef CONFIG_SH_KGDB
/*
* FIXME: Most of this can go away.. at the moment, we rely on
* arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
* most of that can easily be done here instead.
*
* For the time being, just accept the values that were parsed earlier..
*/
static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
*baud = kgdb_baud;
*parity = tolower(kgdb_parity);
*bits = kgdb_bits - '0';
}
/*
* The naming here is somewhat misleading, since kgdb_console_setup() takes
* care of the early-on initialization for kgdb, regardless of whether we
* actually use kgdb as a console or not.
*
* On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
*/
int __init kgdb_console_setup(struct console *co, char *options)
{
struct uart_port *port = &sci_ports[kgdb_portnum].port;
int baud = 38400;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (co->index >= SCI_NPORTS || co->index != kgdb_portnum)
co->index = kgdb_portnum;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
kgdb_console_get_options(port, &baud, &parity, &bits);
kgdb_getchar = kgdb_sci_getchar;
kgdb_putchar = kgdb_sci_putchar;
return uart_set_options(port, co, baud, parity, bits, flow);
}
#endif /* CONFIG_SH_KGDB */
#ifdef CONFIG_SH_KGDB_CONSOLE
static struct console kgdb_console = {
.name = "ttySC",
.write = kgdb_console_write,
.setup = kgdb_console_setup,
.flags = CON_PRINTBUFFER | CON_ENABLED,
.index = -1,
.data = &sci_uart_driver,
};
/* Register the KGDB console so we get messages (d'oh!) */
static int __init kgdb_console_init(void)
{
register_console(&kgdb_console);
return 0;
}
console_initcall(kgdb_console_init);
#endif /* CONFIG_SH_KGDB_CONSOLE */
#if defined(CONFIG_SH_KGDB_CONSOLE)
#define SCI_CONSOLE &kgdb_console
#elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
#define SCI_CONSOLE &serial_console
#else
#define SCI_CONSOLE 0
#endif
static char banner[] __initdata =
KERN_INFO "SuperH SCI(F) driver initialized\n";
static struct uart_driver sci_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "sci",
#ifdef CONFIG_DEVFS_FS
.devfs_name = "ttsc/",
#endif
.dev_name = "ttySC",
.major = SCI_MAJOR,
.minor = SCI_MINOR_START,
.nr = SCI_NPORTS,
.cons = SCI_CONSOLE,
};
static int __init sci_init(void)
{
int chan, ret;
printk("%s", banner);
ret = uart_register_driver(&sci_uart_driver);
if (ret == 0) {
for (chan = 0; chan < SCI_NPORTS; chan++) {
struct sci_port *sciport = &sci_ports[chan];
#if !defined(__H8300H__) && !defined(__H8300S__)
sciport->port.uartclk = (current_cpu_data.module_clock * 16);
#else
sciport->port.uartclk = CONFIG_CPU_CLOCK;
#endif
uart_add_one_port(&sci_uart_driver, &sciport->port);
sciport->break_timer.data = (unsigned long)sciport;
sciport->break_timer.function = sci_break_timer;
init_timer(&sciport->break_timer);
}
}
#ifdef CONFIG_CPU_FREQ
cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
printk("sci: CPU frequency notifier registered\n");
#endif
#ifdef CONFIG_SH_STANDARD_BIOS
sh_bios_gdb_detach();
#endif
return ret;
}
static void __exit sci_exit(void)
{
int chan;
for (chan = 0; chan < SCI_NPORTS; chan++)
uart_remove_one_port(&sci_uart_driver, &sci_ports[chan].port);
uart_unregister_driver(&sci_uart_driver);
}
module_init(sci_init);
module_exit(sci_exit);
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