/* $Id: sh-sci.c,v 1.15 2003/10/13 07:21:19 lethal Exp $
*
* linux/drivers/char/sh-sci.c
*
* SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
* Copyright (C) 1999, 2000 Niibe Yutaka
* Copyright (C) 2000 Sugioka Toshinobu
* Modified to support multiple serial ports. Stuart Menefy (May 2000).
* Modified to support SH7760 SCIF. Paul Mundt (Oct 2003).
*
* TTY code is based on sx.c (Specialix SX driver) by:
*
* (C) 1998 R.E.Wolff@BitWizard.nl
*
*/
#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/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>
#if defined(CONFIG_SERIAL_CONSOLE) || defined(CONFIG_SH_KGDB_CONSOLE)
#include <linux/console.h>
#endif
#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 <asm/bitops.h>
#include <linux/generic_serial.h>
#ifdef CONFIG_SH_STANDARD_BIOS
#include <asm/sh_bios.h>
#endif
#include "sh-sci.h"
#ifdef CONFIG_SH_KGDB
#include <asm/kgdb.h>
int kgdb_sci_setup(void);
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;
#ifdef CONFIG_SH_KGDB_CONSOLE
static struct console kgdbcons;
void __init kgdb_console_init(void);
#endif /* CONFIG_SH_KGDB_CONSOLE */
#endif /* CONFIG_SH_KGDB */
#ifdef CONFIG_SERIAL_CONSOLE
static struct console sercons;
static struct sci_port* sercons_port=0;
static int sercons_baud;
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
static int break_pressed;
#endif /* CONFIG_MAGIC_SYSRQ */
#endif /* CONFIG_SERIAL_CONSOLE */
/* Function prototypes */
static void sci_init_pins_sci(struct sci_port* port, unsigned int cflag);
#ifndef SCI_ONLY
static void sci_init_pins_scif(struct sci_port* port, unsigned int cflag);
#if defined(CONFIG_CPU_SH3)
static void sci_init_pins_irda(struct sci_port* port, unsigned int cflag);
#endif
#endif
static void sci_disable_tx_interrupts(void *ptr);
static void sci_enable_tx_interrupts(void *ptr);
static void sci_disable_rx_interrupts(void *ptr);
static void sci_enable_rx_interrupts(void *ptr);
static int sci_get_CD(void *ptr);
static void sci_shutdown_port(void *ptr);
static int sci_set_real_termios(void *ptr);
static void sci_hungup(void *ptr);
static void sci_close(void *ptr);
static int sci_chars_in_buffer(void *ptr);
static int sci_request_irq(struct sci_port *port);
static void sci_free_irq(struct sci_port *port);
static int sci_init_drivers(void);
static struct tty_driver *sci_driver;
static struct sci_port sci_ports[SCI_NPORTS] = SCI_INIT;
static int sci_debug = 0;
#ifdef MODULE
MODULE_PARM(sci_debug, "i");
#endif
#define dprintk(x...) do { if (sci_debug) printk(x); } while(0)
#ifdef CONFIG_SERIAL_CONSOLE
static void put_char(struct sci_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);
}
#endif
#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
static void handle_error(struct sci_port *port)
{ /* Clear error flags */
sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
}
static int get_char(struct sci_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_CONSOLE
static void put_string(struct sci_port *port, const char *buffer, int count)
{
int i;
const unsigned char *p = buffer;
#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_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));
return;
}
}
#endif /* CONFIG_SH_KGDB */
static struct real_driver sci_real_driver = {
sci_disable_tx_interrupts,
sci_enable_tx_interrupts,
sci_disable_rx_interrupts,
sci_enable_rx_interrupts,
sci_get_CD,
sci_shutdown_port,
sci_set_real_termios,
sci_chars_in_buffer,
sci_close,
sci_hungup,
NULL
};
#if defined(SCI_ONLY) || defined(SCI_AND_SCIF)
static void sci_init_pins_sci(struct sci_port* port, unsigned int cflag)
{
}
#endif
#if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
#if defined(CONFIG_CPU_SH3)
/* For SH7707, SH7709, SH7709A, SH7729 */
static void sci_init_pins_scif(struct sci_port* port, unsigned int cflag)
{
unsigned int fcr_val = 0;
{
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&0x0cff, 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&0x0cff)|0x1000, SCPCR);
data = ctrl_inb(SCPDR);
/* Set /RTS2 (bit6) = 0 */
ctrl_outb(data&0xbf, SCPDR);
}
sci_out(port, SCFCR, fcr_val);
}
static void sci_init_pins_irda(struct sci_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 sci_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 */
static void sci_setsignals(struct sci_port *port, int dtr, int rts)
{
/* 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 int sci_getsignals(struct sci_port *port)
{
/* This routine is used for geting signals of: DTR, DCD, DSR, RI,
and CTS/RTS */
return TIOCM_DTR|TIOCM_RTS|TIOCM_DSR;
/*
(((o_stat & OP_DTR)?TIOCM_DTR:0) |
((o_stat & OP_RTS)?TIOCM_RTS:0) |
((i_stat & IP_CTS)?TIOCM_CTS:0) |
((i_stat & IP_DCD)?TIOCM_CAR:0) |
((i_stat & IP_DSR)?TIOCM_DSR:0) |
((i_stat & IP_RI) ?TIOCM_RNG:0)
*/
}
static void sci_set_baud(struct sci_port *port, int baud)
{
int t;
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;
default:
printk(KERN_INFO "sci: unsupported baud rate: %d, using 115200 instead.\n", baud);
case 115200:
t = BPS_115200;
break;
}
if (t > 0) {
sci_setsignals (port, 1, -1);
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 */
} else {
sci_setsignals (port, 0, -1);
}
}
static void sci_set_termios_cflag(struct sci_port *port, int cflag, int baud)
{
unsigned int status;
unsigned int smr_val;
do
status = sci_in(port, SCxSR);
while (!(status & SCxSR_TEND(port)));
sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
if (port->type == PORT_SCIF) {
sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
}
smr_val = sci_in(port, SCSMR) & 3;
if ((cflag & CSIZE) == CS7)
smr_val |= 0x40;
if (cflag & PARENB)
smr_val |= 0x20;
if (cflag & PARODD)
smr_val |= 0x30;
if (cflag & CSTOPB)
smr_val |= 0x08;
sci_out(port, SCSMR, smr_val);
sci_set_baud(port, baud);
port->init_pins(port, cflag);
sci_out(port, SCSCR, SCSCR_INIT(port));
}
static int sci_set_real_termios(void *ptr)
{
struct sci_port *port = ptr;
if (port->old_cflag != port->gs.tty->termios->c_cflag) {
port->old_cflag = port->gs.tty->termios->c_cflag;
sci_set_termios_cflag(port, port->old_cflag, port->gs.baud);
sci_enable_rx_interrupts(port);
}
return 0;
}
/* ********************************************************************** *
* the interrupt related routines *
* ********************************************************************** */
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
static inline void sci_sched_event(struct sci_port *port, int event)
{
port->event |= 1 << event;
schedule_work(&port->tqueue);
}
static void sci_transmit_chars(struct sci_port *port)
{
int count, i;
int txroom;
unsigned long flags;
unsigned short status;
unsigned short ctrl;
unsigned char c;
status = sci_in(port, SCxSR);
if (!(status & SCxSR_TDxE(port))) {
local_irq_save(flags);
ctrl = sci_in(port, SCSCR);
if (port->gs.xmit_cnt == 0) {
ctrl &= ~SCI_CTRL_FLAGS_TIE;
port->gs.flags &= ~GS_TX_INTEN;
} else
ctrl |= SCI_CTRL_FLAGS_TIE;
sci_out(port, SCSCR, ctrl);
local_irq_restore(flags);
return;
}
while (1) {
count = port->gs.xmit_cnt;
if (port->type == PORT_SCIF) {
txroom = 16 - (sci_in(port, SCFDR)>>8);
} else {
txroom = (sci_in(port, SCxSR) & SCI_TDRE)?1:0;
}
if (count > txroom)
count = txroom;
/* Don't copy past the end of the source buffer */
if (count > SERIAL_XMIT_SIZE - port->gs.xmit_tail)
count = SERIAL_XMIT_SIZE - port->gs.xmit_tail;
/* If for one reason or another, we can't copy more data, we're done! */
if (count == 0)
break;
for (i=0; i<count; i++) {
c = port->gs.xmit_buf[port->gs.xmit_tail + i];
sci_out(port, SCxTDR, c);
}
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
port->icount.tx += count;
/* Update the kernel buffer end */
port->gs.xmit_tail = (port->gs.xmit_tail + count) & (SERIAL_XMIT_SIZE-1);
/* This one last. (this is essential)
It would allow others to start putting more data into the buffer! */
port->gs.xmit_cnt -= count;
}
if (port->gs.xmit_cnt <= port->gs.wakeup_chars)
sci_sched_event(port, SCI_EVENT_WRITE_WAKEUP);
local_irq_save(flags);
ctrl = sci_in(port, SCSCR);
if (port->gs.xmit_cnt == 0) {
ctrl &= ~SCI_CTRL_FLAGS_TIE;
port->gs.flags &= ~GS_TX_INTEN;
} else {
if (port->type == PORT_SCIF) {
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
}
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 sci_port *port,
struct pt_regs *regs)
{
int i, count;
struct tty_struct *tty;
int copied=0;
unsigned short status;
status = sci_in(port, SCxSR);
if (!(status & SCxSR_RDxF(port)))
return;
tty = port->gs.tty;
while (1) {
if (port->type == PORT_SCIF) {
count = sci_in(port, SCFDR)&0x001f;
} else {
count = (sci_in(port, SCxSR)&SCxSR_RDxF(port))?1:0;
}
/* 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) {
tty->flip.char_buf_ptr[0] = sci_in(port, SCxRDR);
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(__SH3__)
/* Skip "chars" during break */
if (port->break_flag) {
if ((c == 0) &&
(status & SCxSR_FER(port))) {
count--; i--;
continue;
}
/* Nonzero => end-of-break */
dprintk("scif: debounce<%02x>\n", c);
port->break_flag = 0;
if (STEPFN(c)) {
count--; i--;
continue;
}
}
#endif /* __SH3__ */
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
if (break_pressed && (port == sercons_port)) {
if (c != 0 &&
time_before(jiffies,
break_pressed + HZ*5)) {
handle_sysrq(c, regs, NULL);
break_pressed = 0;
count--; i--;
continue;
} else if (c != 0) {
break_pressed = 0;
}
}
#endif /* CONFIG_SERIAL_CONSOLE && CONFIG_MAGIC_SYSRQ */
/* Store data and status */
tty->flip.char_buf_ptr[i] = c;
if (status&SCxSR_FER(port)) {
tty->flip.flag_buf_ptr[i] = TTY_FRAME;
dprintk("sci: frame error\n");
} else if (status&SCxSR_PER(port)) {
tty->flip.flag_buf_ptr[i] = TTY_PARITY;
dprintk("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));
}
}
static inline int sci_handle_errors(struct sci_port *port)
{
int copied = 0;
unsigned short status = sci_in(port, SCxSR);
struct tty_struct *tty = port->gs.tty;
if (status&SCxSR_ORER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
/* overrun error */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
dprintk("sci: overrun error\n");
}
if (status&SCxSR_FER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
if (sci_rxd_in(port) == 0) {
/* Notify of BREAK */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_BREAK;
dprintk("sci: BREAK detected\n");
}
else {
/* frame error */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_FRAME;
dprintk("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;
dprintk("sci: parity error\n");
}
if (copied) {
tty->flip.count += copied;
tty_flip_buffer_push(tty);
}
return copied;
}
static inline int sci_handle_breaks(struct sci_port *port)
{
int copied = 0;
unsigned short status = sci_in(port, SCxSR);
struct tty_struct *tty = port->gs.tty;
if (status&SCxSR_BRK(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
#if defined(__SH3__)
/* Debounce break */
if (port->break_flag)
goto break_continue;
port->break_flag = 1;
#endif
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
if (port == sercons_port) {
if (break_pressed == 0) {
break_pressed = jiffies;
dprintk("sci: implied sysrq\n");
goto break_continue;
}
/* Double break implies a real break */
break_pressed = 0;
}
#endif
/* Notify of BREAK */
copied++;
*tty->flip.flag_buf_ptr++ = TTY_BREAK;
dprintk("sci: BREAK detected\n");
}
break_continue:
#if defined(CONFIG_CPU_SUBTYPE_SH7750) || defined(CONFIG_CPU_SUBTYPE_ST40STB1) || \
defined(CONFIG_CPU_SUBTYPE_SH7760)
/* 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;
dprintk("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 sci_port *port = ptr;
if (port->gs.flags & GS_ACTIVE)
if (!(port->gs.flags & SCI_RX_THROTTLE)) {
sci_receive_chars(port, regs);
return IRQ_HANDLED;
}
sci_disable_rx_interrupts(port);
return IRQ_HANDLED;
}
static irqreturn_t sci_tx_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
struct sci_port *port = ptr;
if (port->gs.flags & GS_ACTIVE)
sci_transmit_chars(port);
else {
sci_disable_tx_interrupts(port);
}
return IRQ_HANDLED;
}
static irqreturn_t sci_er_interrupt(int irq, void *ptr, struct pt_regs *regs)
{
struct sci_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
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 sci_port *port = ptr;
/* Handle BREAKs */
sci_handle_breaks(port);
sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
return IRQ_HANDLED;
}
static void do_softint(void *private_)
{
struct sci_port *port = (struct sci_port *) private_;
struct tty_struct *tty;
tty = port->gs.tty;
if (!tty)
return;
if (test_and_clear_bit(SCI_EVENT_WRITE_WAKEUP, &port->event)) {
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
wake_up_interruptible(&tty->write_wait);
}
}
/* ********************************************************************** *
* Here are the routines that actually *
* interface with the generic_serial driver *
* ********************************************************************** */
static void sci_disable_tx_interrupts(void *ptr)
{
struct sci_port *port = ptr;
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_enable_tx_interrupts(void *ptr)
{
struct sci_port *port = ptr;
disable_irq(port->irqs[SCIx_TXI_IRQ]);
sci_transmit_chars(port);
enable_irq(port->irqs[SCIx_TXI_IRQ]);
}
static void sci_disable_rx_interrupts(void * ptr)
{
struct sci_port *port = ptr;
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_out(port, SCSCR, ctrl);
local_irq_restore(flags);
}
static void sci_enable_rx_interrupts(void * ptr)
{
struct sci_port *port = ptr;
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_out(port, SCSCR, ctrl);
local_irq_restore(flags);
}
static int sci_get_CD(void * ptr)
{
/* If you have signal for CD (Carrier Detect), please change here. */
return 1;
}
static int sci_chars_in_buffer(void * ptr)
{
struct sci_port *port = ptr;
if (port->type == PORT_SCIF) {
return (sci_in(port, SCFDR) >> 8) + ((sci_in(port, SCxSR) & SCxSR_TEND(port))? 0: 1);
} else {
return (sci_in(port, SCxSR) & SCxSR_TEND(port))? 0: 1;
}
}
static void sci_shutdown_port(void * ptr)
{
struct sci_port *port = ptr;
port->gs.flags &= ~ GS_ACTIVE;
if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL)
sci_setsignals(port, 0, 0);
sci_free_irq(port);
}
/* ********************************************************************** *
* Here are the routines that actually *
* interface with the rest of the system *
* ********************************************************************** */
static int sci_open(struct tty_struct * tty, struct file * filp)
{
struct sci_port *port;
int retval, line;
line = tty->index;
if ((line < 0) || (line >= SCI_NPORTS))
return -ENODEV;
port = &sci_ports[line];
tty->driver_data = port;
port->gs.tty = tty;
port->gs.count++;
port->event = 0;
INIT_WORK(&port->tqueue, do_softint, port);
/*
* Start up serial port
*/
retval = gs_init_port(&port->gs);
if (retval) {
goto failed_1;
}
port->gs.flags |= GS_ACTIVE;
sci_setsignals(port, 1,1);
if (port->gs.count == 1) {
retval = sci_request_irq(port);
}
retval = gs_block_til_ready(port, filp);
if (retval) {
goto failed_3;
}
#ifdef CONFIG_SERIAL_CONSOLE
if (sercons.cflag && sercons.index == line) {
tty->termios->c_cflag = sercons.cflag;
port->gs.baud = sercons_baud;
sercons.cflag = 0;
sci_set_real_termios(port);
}
#endif
#ifdef CONFIG_SH_KGDB_CONSOLE
if (kgdbcons.cflag && kgdbcons.index == line) {
tty->termios->c_cflag = kgdbcons.cflag;
port->gs.baud = kgdb_baud;
sercons.cflag = 0;
sci_set_real_termios(port);
}
#endif
sci_enable_rx_interrupts(port);
return 0;
failed_3:
sci_free_irq(port);
failed_1:
port->gs.count--;
return retval;
}
static void sci_hungup(void *ptr)
{
return;
}
static void sci_close(void *ptr)
{
return;
}
static int sci_ioctl(struct tty_struct * tty, struct file * filp,
unsigned int cmd, unsigned long arg)
{
int rc;
struct sci_port *port = tty->driver_data;
int ival;
rc = 0;
switch (cmd) {
case TIOCGSOFTCAR:
rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
(unsigned int __user *) arg);
break;
case TIOCSSOFTCAR:
if ((rc = get_user(ival, (unsigned int __user *) arg)) == 0)
tty->termios->c_cflag =
(tty->termios->c_cflag & ~CLOCAL) |
(ival ? CLOCAL : 0);
break;
case TIOCGSERIAL:
if ((rc = verify_area(VERIFY_WRITE, (void __user *) arg,
sizeof(struct serial_struct))) == 0)
rc = gs_getserial(&port->gs, (struct serial_struct *) arg);
break;
case TIOCSSERIAL:
if ((rc = verify_area(VERIFY_READ, (void __user *) arg,
sizeof(struct serial_struct))) == 0)
rc = gs_setserial(&port->gs,
(struct serial_struct *) arg);
break;
case TIOCMGET:
ival = sci_getsignals(port);
rc = put_user(ival, (unsigned int __user *) arg);
break;
case TIOCMBIS:
if ((rc = get_user(ival, (unsigned int __user *) arg)) == 0)
sci_setsignals(port, ((ival & TIOCM_DTR) ? 1 : -1),
((ival & TIOCM_RTS) ? 1 : -1));
break;
case TIOCMBIC:
if ((rc = get_user(ival, (unsigned int __user *) arg)) == 0)
sci_setsignals(port, ((ival & TIOCM_DTR) ? 0 : -1),
((ival & TIOCM_RTS) ? 0 : -1));
break;
case TIOCMSET:
if ((rc = get_user(ival, (unsigned int __user *)arg)) == 0)
sci_setsignals(port, ((ival & TIOCM_DTR) ? 1 : 0),
((ival & TIOCM_RTS) ? 1 : 0));
break;
default:
rc = -ENOIOCTLCMD;
break;
}
return rc;
}
static void sci_throttle(struct tty_struct * tty)
{
struct sci_port *port = (struct sci_port *)tty->driver_data;
/* If the port is using any type of input flow
* control then throttle the port.
*/
if ((tty->termios->c_cflag & CRTSCTS) || (I_IXOFF(tty)) )
port->gs.flags |= SCI_RX_THROTTLE;
}
static void sci_unthrottle(struct tty_struct * tty)
{
struct sci_port *port = (struct sci_port *)tty->driver_data;
/* Always unthrottle even if flow control is not enabled on
* this port in case we disabled flow control while the port
* was throttled
*/
port->gs.flags &= ~SCI_RX_THROTTLE;
sci_enable_rx_interrupts(port);
return;
}
#ifdef CONFIG_PROC_FS
static int sci_read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
int i;
struct sci_port *port;
int len = 0;
len += sprintf(page, "sciinfo:0.1\n");
for (i = 0; i < SCI_NPORTS && len < 4000; i++) {
port = &sci_ports[i];
len += sprintf(page+len, "%d: uart:%s address: %08x", i,
(port->type == PORT_SCI) ? "SCI" : "SCIF",
port->base);
len += sprintf(page+len, " baud:%d", port->gs.baud);
len += sprintf(page+len, " tx:%d rx:%d",
port->icount.tx, port->icount.rx);
if (port->icount.frame)
len += sprintf(page+len, " fe:%d", port->icount.frame);
if (port->icount.parity)
len += sprintf(page+len, " pe:%d", port->icount.parity);
if (port->icount.brk)
len += sprintf(page+len, " brk:%d", port->icount.brk);
if (port->icount.overrun)
len += sprintf(page+len, " oe:%d", port->icount.overrun);
len += sprintf(page+len, "\n");
}
return len;
}
#endif
#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) {
for (i = 0; i < SCI_NPORTS; i++) {
/*
* This will force a baud rate change in hardware.
*/
if (sci_ports[i].gs.tty != NULL) {
sci_set_baud(&sci_ports[i], sci_ports[i].gs.baud);
}
}
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 struct tty_operations sci_ops = {
.open = sci_open,
.close = gs_close,
.write = gs_write,
.put_char = gs_put_char,
.flush_chars = gs_flush_chars,
.write_room = gs_write_room,
.chars_in_buffer = gs_chars_in_buffer,
.flush_buffer = gs_flush_buffer,
.ioctl = sci_ioctl,
.throttle = sci_throttle,
.unthrottle = sci_unthrottle,
.set_termios = gs_set_termios,
.stop = gs_stop,
.start = gs_start,
.hangup = gs_hangup,
#ifdef CONFIG_PROC_FS
.read_proc = sci_read_proc,
#endif
};
/* ********************************************************************** *
* Here are the initialization routines. *
* ********************************************************************** */
static int sci_init_drivers(void)
{
int error;
struct sci_port *port;
sci_driver = alloc_tty_driver(SCI_NPORTS);
if (!sci_driver)
return -ENOMEM;
sci_driver->owner = THIS_MODULE;
sci_driver->driver_name = "sci";
sci_driver->name = "ttySC";
sci_driver->devfs_name = "ttsc/";
sci_driver->major = SCI_MAJOR;
sci_driver->minor_start = SCI_MINOR_START;
sci_driver->type = TTY_DRIVER_TYPE_SERIAL;
sci_driver->subtype = SERIAL_TYPE_NORMAL;
sci_driver->init_termios = tty_std_termios;
sci_driver->init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL | CRTSCTS;
sci_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(sci_driver, &sci_ops);
if ((error = tty_register_driver(sci_driver))) {
printk(KERN_ERR "sci: Couldn't register SCI driver, error = %d\n",
error);
put_tty_driver(sci_driver);
return 1;
}
for (port = &sci_ports[0]; port < &sci_ports[SCI_NPORTS]; port++) {
port->gs.magic = SCI_MAGIC;
port->gs.close_delay = HZ/2;
port->gs.closing_wait = 30 * HZ;
port->gs.rd = &sci_real_driver;
init_waitqueue_head(&port->gs.open_wait);
init_waitqueue_head(&port->gs.close_wait);
port->old_cflag = 0;
port->icount.cts = port->icount.dsr =
port->icount.rng = port->icount.dcd = 0;
port->icount.rx = port->icount.tx = 0;
port->icount.frame = port->icount.parity = 0;
port->icount.overrun = port->icount.brk = 0;
}
#ifdef CONFIG_CPU_FREQ
/* Setup transition notifier */
if (cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER) < 0) {
printk(KERN_ERR "sci: Unable to register CPU frequency notifier\n");
return 1;
}
printk("sci: CPU frequency notifier registered\n");
#endif
return 0;
}
static int sci_request_irq(struct sci_port *port)
{
int i;
irqreturn_t (*handlers[4])(int irq, void *p, struct pt_regs *regs) = {
sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
sci_br_interrupt,
};
for (i=0; i<4; i++) {
if (!port->irqs[i]) continue;
if (request_irq(port->irqs[i], handlers[i], SA_INTERRUPT,
"sci", port)) {
printk(KERN_ERR "sci: Cannot allocate irq.\n");
return -ENODEV;
}
}
return 0;
}
static void sci_free_irq(struct sci_port *port)
{
int i;
for (i=0; i<4; i++) {
if (!port->irqs[i]) continue;
free_irq(port->irqs[i], port);
}
}
static char banner[] __initdata =
KERN_INFO "SuperH SCI(F) driver initialized\n";
int __init sci_init(void)
{
struct sci_port *port;
int j;
printk("%s", banner);
for (j=0; j<SCI_NPORTS; j++) {
port = &sci_ports[j];
printk(KERN_INFO "ttySC%d at 0x%08x is a %s\n", j, port->base,
(port->type == PORT_SCI) ? "SCI" : "SCIF");
}
sci_init_drivers();
#ifdef CONFIG_SH_STANDARD_BIOS
sh_bios_gdb_detach();
#endif
return 0; /* Return -EIO when not detected */
}
module_init(sci_init);
#ifdef MODULE
#undef func_enter
#undef func_exit
void cleanup_module(void)
{
tty_unregister_driver(sci_driver);
put_tty_driver(sci_driver);
}
#include "generic_serial.c"
#endif
#ifdef CONFIG_SERIAL_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(sercons_port, s, count);
}
static struct tty_driver *serial_console_device(struct console *c, int *index)
{
*index = c->index;
return sci_driver;
}
/*
* Setup initial baud/bits/parity. We do two things here:
* - construct a cflag setting for the first rs_open()
* - initialize the serial port
* Return non-zero if we didn't find a serial port.
*/
static int __init serial_console_setup(struct console *co, char *options)
{
int baud = 9600;
int bits = 8;
int parity = 'n';
int cflag = CREAD | HUPCL | CLOCAL;
char *s;
sercons_port = &sci_ports[co->index];
if (options) {
baud = simple_strtoul(options, NULL, 10);
s = options;
while(*s >= '0' && *s <= '9')
s++;
if (*s) parity = *s++;
if (*s) bits = *s - '0';
}
/*
* Now construct a cflag setting.
*/
switch (baud) {
case 19200:
cflag |= B19200;
break;
case 38400:
cflag |= B38400;
break;
case 57600:
cflag |= B57600;
break;
case 115200:
cflag |= B115200;
break;
case 9600:
default:
cflag |= B9600;
baud = 9600;
break;
}
switch (bits) {
case 7:
cflag |= CS7;
break;
default:
case 8:
cflag |= CS8;
break;
}
switch (parity) {
case 'o': case 'O':
cflag |= PARODD;
break;
case 'e': case 'E':
cflag |= PARENB;
break;
}
co->cflag = cflag;
sercons_baud = baud;
sci_set_termios_cflag(sercons_port, cflag, baud);
sercons_port->old_cflag = cflag;
return 0;
}
static struct console sercons = {
.name = "ttySC",
.write = serial_console_write,
.device = serial_console_device,
.setup = serial_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
/*
* Register console.
*/
#ifdef CONFIG_SH_EARLY_PRINTK
extern void sh_console_unregister (void);
#endif
static int __init sci_console_init(void)
{
register_console(&sercons);
#ifdef CONFIG_SH_EARLY_PRINTK
/* Now that the real console is available, unregister the one we
* used while first booting.
*/
sh_console_unregister();
#endif
return 0;
}
console_initcall(sci_console_init);
#endif /* CONFIG_SERIAL_CONSOLE */
#ifdef CONFIG_SH_KGDB
/* Initialise the KGDB serial port */
int kgdb_sci_setup(void)
{
int cflag = CREAD | HUPCL | CLOCAL;
if ((kgdb_portnum < 0) || (kgdb_portnum >= SCI_NPORTS))
return -1;
kgdb_sci_port = &sci_ports[kgdb_portnum];
switch (kgdb_baud) {
case 115200:
cflag |= B115200;
break;
case 57600:
cflag |= B57600;
break;
case 38400:
cflag |= B38400;
break;
case 19200:
cflag |= B19200;
break;
case 9600:
default:
cflag |= B9600;
kgdb_baud = 9600;
break;
}
switch (kgdb_bits) {
case '7':
cflag |= CS7;
break;
default:
case '8':
cflag |= CS8;
break;
}
switch (kgdb_parity) {
case 'O':
cflag |= PARODD;
break;
case 'E':
cflag |= PARENB;
break;
}
kgdb_cflag = cflag;
sci_set_termios_cflag(kgdb_sci_port, kgdb_cflag, kgdb_baud);
/* Set up the interrupt for BREAK from GDB */
/* Commented out for now since it may not be possible yet...
request_irq(kgdb_sci_port->irqs[0], kgdb_break_interrupt,
SA_INTERRUPT, "sci", kgdb_sci_port);
sci_enable_rx_interrupts(kgdb_sci_port);
*/
/* Setup complete: initialize function pointers */
kgdb_getchar = kgdb_sci_getchar;
kgdb_putchar = kgdb_sci_putchar;
return 0;
}
#ifdef CONFIG_SH_KGDB_CONSOLE
/* Create a console device */
static kdev_t kgdb_console_device(struct console *c)
{
return MKDEV(SCI_MAJOR, SCI_MINOR_START + c->index);
}
/* Set up the KGDB console */
static int __init kgdb_console_setup(struct console *co, char *options)
{
/* NB we ignore 'options' because we've already done the setup */
co->cflag = kgdb_cflag;
return 0;
}
/* Register the KGDB console so we get messages (d'oh!) */
void __init kgdb_console_init(void)
{
register_console(&kgdbcons);
}
/* The console structure for KGDB */
static struct console kgdbcons = {
name:"ttySC",
write:kgdb_console_write,
device:kgdb_console_device,
wait_key:serial_console_wait_key,
setup:kgdb_console_setup,
flags:CON_PRINTBUFFER | CON_ENABLED,
index:-1,
};
#endif /* CONFIG_SH_KGDB_CONSOLE */
#endif /* CONFIG_SH_KGDB */
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