/*
* Copyright (C) 2003, Axis Communications AB.
*/
#include <linux/config.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/tty.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/arch/hwregs/ser_defs.h>
#include <asm/arch/hwregs/dma_defs.h>
#include <asm/arch/pinmux.h>
#include <asm/irq.h>
#include <asm/arch/hwregs/intr_vect_defs.h>
struct dbg_port
{
unsigned char nbr;
unsigned long instance;
unsigned int started;
unsigned long baudrate;
unsigned char parity;
unsigned int bits;
};
struct dbg_port ports[] =
{
{
0,
regi_ser0,
0,
115200,
'N',
8
},
{
1,
regi_ser1,
0,
115200,
'N',
8
},
{
2,
regi_ser2,
0,
115200,
'N',
8
},
{
3,
regi_ser3,
0,
115200,
'N',
8
}
};
static 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
#ifdef CONFIG_ETRAX_KGDB
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
#endif
#ifdef CONFIG_ETRAXFS_SIM
extern void print_str( const char *str );
static char buffer[1024];
static char msg[] = "Debug: ";
static int buffer_pos = sizeof(msg) - 1;
#endif
extern struct tty_driver *serial_driver;
static void
start_port(struct dbg_port* p)
{
if (!p)
return;
if (p->started)
return;
p->started = 1;
if (p->nbr == 1)
crisv32_pinmux_alloc_fixed(pinmux_ser1);
else if (p->nbr == 2)
crisv32_pinmux_alloc_fixed(pinmux_ser2);
else if (p->nbr == 3)
crisv32_pinmux_alloc_fixed(pinmux_ser3);
/* Set up serial port registers */
reg_ser_rw_tr_ctrl tr_ctrl = {0};
reg_ser_rw_tr_dma_en tr_dma_en = {0};
reg_ser_rw_rec_ctrl rec_ctrl = {0};
reg_ser_rw_tr_baud_div tr_baud_div = {0};
reg_ser_rw_rec_baud_div rec_baud_div = {0};
tr_ctrl.base_freq = rec_ctrl.base_freq = regk_ser_f29_493;
tr_dma_en.en = rec_ctrl.dma_mode = regk_ser_no;
tr_baud_div.div = rec_baud_div.div = 29493000 / p->baudrate / 8;
tr_ctrl.en = rec_ctrl.en = 1;
if (p->parity == 'O')
{
tr_ctrl.par_en = regk_ser_yes;
tr_ctrl.par = regk_ser_odd;
rec_ctrl.par_en = regk_ser_yes;
rec_ctrl.par = regk_ser_odd;
}
else if (p->parity == 'E')
{
tr_ctrl.par_en = regk_ser_yes;
tr_ctrl.par = regk_ser_even;
rec_ctrl.par_en = regk_ser_yes;
rec_ctrl.par = regk_ser_odd;
}
if (p->bits == 7)
{
tr_ctrl.data_bits = regk_ser_bits7;
rec_ctrl.data_bits = regk_ser_bits7;
}
REG_WR (ser, p->instance, rw_tr_baud_div, tr_baud_div);
REG_WR (ser, p->instance, rw_rec_baud_div, rec_baud_div);
REG_WR (ser, p->instance, rw_tr_dma_en, tr_dma_en);
REG_WR (ser, p->instance, rw_tr_ctrl, tr_ctrl);
REG_WR (ser, p->instance, rw_rec_ctrl, rec_ctrl);
}
/* No debug */
#ifdef CONFIG_ETRAX_DEBUG_PORT_NULL
static void
console_write(struct console *co, const char *buf, unsigned int len)
{
return;
}
/* Target debug */
#elif !defined(CONFIG_ETRAXFS_SIM)
static void
console_write_direct(struct console *co, const char *buf, unsigned int len)
{
int i;
reg_ser_r_stat_din stat;
reg_ser_rw_tr_dma_en tr_dma_en, old;
/* Switch to manual mode */
tr_dma_en = old = REG_RD (ser, port->instance, rw_tr_dma_en);
if (tr_dma_en.en == regk_ser_yes) {
tr_dma_en.en = regk_ser_no;
REG_WR(ser, port->instance, rw_tr_dma_en, tr_dma_en);
}
/* Send data */
for (i = 0; i < len; i++) {
/* LF -> CRLF */
if (buf[i] == '\n') {
do {
stat = REG_RD (ser, port->instance, r_stat_din);
} while (!stat.tr_rdy);
REG_WR_INT (ser, port->instance, rw_dout, '\r');
}
/* Wait until transmitter is ready and send.*/
do {
stat = REG_RD (ser, port->instance, r_stat_din);
} while (!stat.tr_rdy);
REG_WR_INT (ser, port->instance, rw_dout, buf[i]);
}
/* Restore mode */
if (tr_dma_en.en != old.en)
REG_WR(ser, port->instance, rw_tr_dma_en, old);
}
static void
console_write(struct console *co, const char *buf, unsigned int len)
{
if (!port)
return;
console_write_direct(co, buf, len);
}
#else
/* VCS debug */
static void
console_write(struct console *co, const char *buf, unsigned int len)
{
char* pos;
pos = memchr(buf, '\n', len);
if (pos) {
int l = ++pos - buf;
memcpy(buffer + buffer_pos, buf, l);
memcpy(buffer, msg, sizeof(msg) - 1);
buffer[buffer_pos + l] = '\0';
print_str(buffer);
buffer_pos = sizeof(msg) - 1;
if (pos - buf != len) {
memcpy(buffer + buffer_pos, pos, len - l);
buffer_pos += len - l;
}
} else {
memcpy(buffer + buffer_pos, buf, len);
buffer_pos += len;
}
}
#endif
int raw_printk(const char *fmt, ...)
{
static char buf[1024];
int printed_len;
va_list args;
va_start(args, fmt);
printed_len = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
console_write(NULL, buf, strlen(buf));
return printed_len;
}
void
stupid_debug(char* buf)
{
console_write(NULL, buf, strlen(buf));
}
#ifdef CONFIG_ETRAX_KGDB
/* Use polling to get a single character from the kernel debug port */
int
getDebugChar(void)
{
reg_ser_rs_status_data stat;
reg_ser_rw_ack_intr ack_intr = { 0 };
do {
stat = REG_RD(ser, kgdb_instance, rs_status_data);
} while (!stat.data_avail);
/* Ack the data_avail interrupt. */
ack_intr.data_avail = 1;
REG_WR(ser, kgdb_instance, rw_ack_intr, ack_intr);
return stat.data;
}
/* Use polling to put a single character to the kernel debug port */
void
putDebugChar(int val)
{
reg_ser_r_status_data stat;
do {
stat = REG_RD (ser, kgdb_instance, r_status_data);
} while (!stat.tr_ready);
REG_WR (ser, kgdb_instance, rw_data_out, REG_TYPE_CONV(reg_ser_rw_data_out, int, val));
}
#endif /* CONFIG_ETRAX_KGDB */
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(port);
}
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;
}
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;
dummy_driver.init_termios.c_cflag =
B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */
dummy_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
dummy_driver.open = dummy_open;
dummy_driver.close = dummy_close;
dummy_driver.write = dummy_write;
dummy_driver.write_room = dummy_write_room;
if (tty_register_driver(&dummy_driver))
panic("Couldn't register dummy serial driver\n");
}
static struct tty_driver*
crisv32_console_device(struct console* co, int *index)
{
if (port)
*index = port->nbr;
return port ? serial_driver : &dummy_driver;
}
static struct console sercons = {
name : "ttyS",
write: console_write,
read : NULL,
device : crisv32_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 : crisv32_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 : crisv32_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 : crisv32_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 : crisv32_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 /* CONFIG_ETRAX_KGDB */
return 0;
}
__initcall(init_etrax_debug);
