/* Serialport functions for debugging
*
* Copyright (c) 2000-2007 Axis Communications AB
*
* Authors: Bjorn Wesen
*
* Exports:
* console_print_etrax(char *buf)
* int getDebugChar()
* putDebugChar(int)
* enableDebugIRQ()
* init_etrax_debug()
*
*/
#include <linux/console.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/tty.h>
#include <arch/svinto.h>
#include <asm/io.h> /* Get SIMCOUT. */
extern void reset_watchdog(void);
struct dbg_port
{
unsigned int index;
const volatile unsigned* read;
volatile char* write;
volatile unsigned* xoff;
volatile char* baud;
volatile char* tr_ctrl;
volatile char* rec_ctrl;
unsigned long irq;
unsigned int started;
unsigned long baudrate;
unsigned char parity;
unsigned int bits;
};
struct dbg_port ports[]=
{
{
0,
R_SERIAL0_READ,
R_SERIAL0_TR_DATA,
R_SERIAL0_XOFF,
R_SERIAL0_BAUD,
R_SERIAL0_TR_CTRL,
R_SERIAL0_REC_CTRL,
IO_STATE(R_IRQ_MASK1_SET, ser0_data, set),
0,
115200,
'N',
8
},
{
1,
R_SERIAL1_READ,
R_SERIAL1_TR_DATA,
R_SERIAL1_XOFF,
R_SERIAL1_BAUD,
R_SERIAL1_TR_CTRL,
R_SERIAL1_REC_CTRL,
IO_STATE(R_IRQ_MASK1_SET, ser1_data, set),
0,
115200,
'N',
8
},
{
2,
R_SERIAL2_READ,
R_SERIAL2_TR_DATA,
R_SERIAL2_XOFF,
R_SERIAL2_BAUD,
R_SERIAL2_TR_CTRL,
R_SERIAL2_REC_CTRL,
IO_STATE(R_IRQ_MASK1_SET, ser2_data, set),
0,
115200,
'N',
8
},
{
3,
R_SERIAL3_READ,
R_SERIAL3_TR_DATA,
R_SERIAL3_XOFF,
R_SERIAL3_BAUD,
R_SERIAL3_TR_CTRL,
R_SERIAL3_REC_CTRL,
IO_STATE(R_IRQ_MASK1_SET, ser3_data, set),
0,
115200,
'N',
8
}
};
#ifdef CONFIG_ETRAX_SERIAL
extern struct tty_driver *serial_driver;
#endif
struct dbg_port* port =
#if defined(CONFIG_ETRAX_DEBUG_PORT0)
&ports[0];
#elif defined(CONFIG_ETRAX_DEBUG_PORT1)
&ports[1];
#elif defined(CONFIG_ETRAX_DEBUG_PORT2)
&ports[2];
#elif defined(CONFIG_ETRAX_DEBUG_PORT3)
&ports[3];
#else
NULL;
#endif
static struct dbg_port* kgdb_port =
#if defined(CONFIG_ETRAX_KGDB_PORT0)
&ports[0];
#elif defined(CONFIG_ETRAX_KGDB_PORT1)
&ports[1];
#elif defined(CONFIG_ETRAX_KGDB_PORT2)
&ports[2];
#elif defined(CONFIG_ETRAX_KGDB_PORT3)
&ports[3];
#else
NULL;
#endif
static void
start_port(struct dbg_port* p)
{
unsigned long rec_ctrl = 0;
unsigned long tr_ctrl = 0;
if (!p)
return;
if (p->started)
return;
p->started = 1;
if (p->index == 0)
{
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
}
else if (p->index == 1)
{
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
}
else if (p->index == 2)
{
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, ser2, select);
}
else
{
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, ser3, select);
}
*R_GEN_CONFIG = genconfig_shadow;
*p->xoff =
IO_STATE(R_SERIAL0_XOFF, tx_stop, enable) |
IO_STATE(R_SERIAL0_XOFF, auto_xoff, disable) |
IO_FIELD(R_SERIAL0_XOFF, xoff_char, 0);
switch (p->baudrate)
{
case 0:
case 115200:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
break;
case 1200:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c1200Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c1200Hz);
break;
case 2400:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c2400Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c2400Hz);
break;
case 4800:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c4800Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c4800Hz);
break;
case 9600:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c9600Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c9600Hz);
break;
case 19200:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c19k2Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c19k2Hz);
break;
case 38400:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c38k4Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c38k4Hz);
break;
case 57600:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c57k6Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c57k6Hz);
break;
default:
*p->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
break;
}
if (p->parity == 'E') {
rec_ctrl =
IO_STATE(R_SERIAL0_REC_CTRL, rec_par, even) |
IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
tr_ctrl =
IO_STATE(R_SERIAL0_TR_CTRL, tr_par, even) |
IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
} else if (p->parity == 'O') {
rec_ctrl =
IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd) |
IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
tr_ctrl =
IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd) |
IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
} else {
rec_ctrl =
IO_STATE(R_SERIAL0_REC_CTRL, rec_par, even) |
IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, disable);
tr_ctrl =
IO_STATE(R_SERIAL0_TR_CTRL, tr_par, even) |
IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, disable);
}
if (p->bits == 7)
{
rec_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
tr_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
}
else
{
rec_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_8bit);
tr_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_8bit);
}
*p->rec_ctrl =
IO_STATE(R_SERIAL0_REC_CTRL, dma_err, stop) |
IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable) |
IO_STATE(R_SERIAL0_REC_CTRL, rts_, active) |
IO_STATE(R_SERIAL0_REC_CTRL, sampling, middle) |
IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, normal) |
rec_ctrl;
*p->tr_ctrl =
IO_FIELD(R_SERIAL0_TR_CTRL, txd, 0) |
IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable) |
IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, disabled) |
IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, one_bit) |
IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, normal) |
tr_ctrl;
}
static void
console_write_direct(struct console *co, const char *buf, unsigned int len)
{
int i;
unsigned long flags;
if (!port)
return;
local_irq_save(flags);
/* Send data */
for (i = 0; i < len; i++) {
/* LF -> CRLF */
if (buf[i] == '\n') {
while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
;
*port->write = '\r';
}
/* Wait until transmitter is ready and send.*/
while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
;
*port->write = buf[i];
}
/*
* Feed the watchdog, otherwise it will reset the chip during boot.
* The time to send an ordinary boot message line (10-90 chars)
* varies between 1-8ms at 115200. What makes up for the additional
* 90ms that allows the watchdog to bite?
*/
reset_watchdog();
local_irq_restore(flags);
}
static void
console_write(struct console *co, const char *buf, unsigned int len)
{
if (!port)
return;
#ifdef CONFIG_SVINTO_SIM
/* no use to simulate the serial debug output */
SIMCOUT(buf, len);
return;
#endif
console_write_direct(co, buf, len);
}
/* legacy function */
void
console_print_etrax(const char *buf)
{
console_write(NULL, buf, strlen(buf));
}
/* Use polling to get a single character FROM the debug port */
int
getDebugChar(void)
{
unsigned long readval;
if (!kgdb_port)
return 0;
do {
readval = *kgdb_port->read;
} while (!(readval & IO_MASK(R_SERIAL0_READ, data_avail)));
return (readval & IO_MASK(R_SERIAL0_READ, data_in));
}
/* Use polling to put a single character to the debug port */
void
putDebugChar(int val)
{
if (!kgdb_port)
return;
while (!(*kgdb_port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
;
*kgdb_port->write = val;
}
/* Enable irq for receiving chars on the debug port, used by kgdb */
void
enableDebugIRQ(void)
{
if (!kgdb_port)
return;
*R_IRQ_MASK1_SET = kgdb_port->irq;
/* use R_VECT_MASK directly, since we really bypass Linux normal
* IRQ handling in kgdb anyway, we don't need to use enable_irq
*/
*R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
*kgdb_port->rec_ctrl = IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
}
static int __init
console_setup(struct console *co, char *options)
{
char* s;
if (options) {
port = &ports[co->index];
port->baudrate = 115200;
port->parity = 'N';
port->bits = 8;
port->baudrate = simple_strtoul(options, NULL, 10);
s = options;
while(*s >= '0' && *s <= '9')
s++;
if (*s) port->parity = *s++;
if (*s) port->bits = *s++ - '0';
port->started = 0;
start_port(0);
}
return 0;
}
/* This is a dummy serial device that throws away anything written to it.
* This is used when no debug output is wanted.
*/
static struct tty_driver dummy_driver;
static int dummy_open(struct tty_struct *tty, struct file * filp)
{
return 0;
}
static void dummy_close(struct tty_struct *tty, struct file * filp)
{
}
static int dummy_write(struct tty_struct * tty,
const unsigned char *buf, int count)
{
return count;
}
static int dummy_write_room(struct tty_struct *tty)
{
return 8192;
}
static const struct tty_operations dummy_ops = {
.open = dummy_open,
.close = dummy_close,
.write = dummy_write,
.write_room = dummy_write_room,
};
void __init
init_dummy_console(void)
{
memset(&dummy_driver, 0, sizeof(struct tty_driver));
dummy_driver.driver_name = "serial";
dummy_driver.name = "ttyS";
dummy_driver.major = TTY_MAJOR;
dummy_driver.minor_start = 68;
dummy_driver.num = 1; /* etrax100 has 4 serial ports */
dummy_driver.type = TTY_DRIVER_TYPE_SERIAL;
dummy_driver.subtype = SERIAL_TYPE_NORMAL;
dummy_driver.init_termios = tty_std_termios;
/* Normally B9600 default... */
dummy_driver.init_termios.c_cflag =
B115200 | CS8 | CREAD | HUPCL | CLOCAL;
dummy_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
dummy_driver.init_termios.c_ispeed = 115200;
dummy_driver.init_termios.c_ospeed = 115200;
dummy_driver.ops = &dummy_ops;
if (tty_register_driver(&dummy_driver))
panic("Couldn't register dummy serial driver\n");
}
static struct tty_driver*
etrax_console_device(struct console* co, int *index)
{
if (port)
*index = port->index;
else
*index = 0;
#ifdef CONFIG_ETRAX_SERIAL
return port ? serial_driver : &dummy_driver;
#else
return &dummy_driver;
#endif
}
static struct console sercons = {
name : "ttyS",
write: console_write,
read : NULL,
device : etrax_console_device,
unblank : NULL,
setup : console_setup,
flags : CON_PRINTBUFFER,
index : -1,
cflag : 0,
next : NULL
};
static struct console sercons0 = {
name : "ttyS",
write: console_write,
read : NULL,
device : etrax_console_device,
unblank : NULL,
setup : console_setup,
flags : CON_PRINTBUFFER,
index : 0,
cflag : 0,
next : NULL
};
static struct console sercons1 = {
name : "ttyS",
write: console_write,
read : NULL,
device : etrax_console_device,
unblank : NULL,
setup : console_setup,
flags : CON_PRINTBUFFER,
index : 1,
cflag : 0,
next : NULL
};
static struct console sercons2 = {
name : "ttyS",
write: console_write,
read : NULL,
device : etrax_console_device,
unblank : NULL,
setup : console_setup,
flags : CON_PRINTBUFFER,
index : 2,
cflag : 0,
next : NULL
};
static struct console sercons3 = {
name : "ttyS",
write: console_write,
read : NULL,
device : etrax_console_device,
unblank : NULL,
setup : console_setup,
flags : CON_PRINTBUFFER,
index : 3,
cflag : 0,
next : NULL
};
/*
* Register console (for printk's etc)
*/
int __init
init_etrax_debug(void)
{
static int first = 1;
if (!first) {
unregister_console(&sercons);
register_console(&sercons0);
register_console(&sercons1);
register_console(&sercons2);
register_console(&sercons3);
init_dummy_console();
return 0;
}
first = 0;
register_console(&sercons);
start_port(port);
#ifdef CONFIG_ETRAX_KGDB
start_port(kgdb_port);
#endif
return 0;
}
__initcall(init_etrax_debug);
