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CRISv32: Implement early console

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Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
This commit is contained in:
Jesper Nilsson 2014-10-08 15:52:49 +02:00
parent 421d085252
commit 4729d77332
1 changed files with 56 additions and 26 deletions
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82
arch/cris/arch-v32/kernel/debugport.c
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@ -3,7 +3,9 @@
*/
#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <hwregs/reg_rdwr.h>
#include <hwregs/reg_map.h>
#include <hwregs/ser_defs.h>
@ -65,6 +67,7 @@ struct dbg_port ports[] =
},
#endif
};
static struct dbg_port *port =
#if defined(CONFIG_ETRAX_DEBUG_PORT0)
&ports[0];
@ -97,14 +100,19 @@ static struct dbg_port *kgdb_port =
#endif
#endif
static void
start_port(struct dbg_port* p)
static void start_port(struct dbg_port *p)
{
if (!p)
/* 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};
if (!p || p->started)
return;
if (p->started)
return;
p->started = 1;
if (p->nbr == 1)
@ -118,36 +126,24 @@ start_port(struct dbg_port* p)
crisv32_pinmux_alloc_fixed(pinmux_ser4);
#endif
/* 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')
{
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')
{
} 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)
{
if (p->bits == 7) {
tr_ctrl.data_bits = regk_ser_bits7;
rec_ctrl.data_bits = regk_ser_bits7;
}
@ -161,8 +157,7 @@ start_port(struct dbg_port* p)
#ifdef CONFIG_ETRAX_KGDB
/* Use polling to get a single character from the kernel debug port */
int
getDebugChar(void)
int getDebugChar(void)
{
reg_ser_rs_stat_din stat;
reg_ser_rw_ack_intr ack_intr = { 0 };
@ -179,8 +174,7 @@ getDebugChar(void)
}
/* Use polling to put a single character to the kernel debug port */
void
putDebugChar(int val)
void putDebugChar(int val)
{
reg_ser_r_stat_din stat;
do {
@ -190,12 +184,48 @@ putDebugChar(int val)
}
#endif /* CONFIG_ETRAX_KGDB */
static void __init early_putch(int c)
{
reg_ser_r_stat_din stat;
/* 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, c);
}
static void __init
early_console_write(struct console *con, const char *s, unsigned n)
{
extern void reset_watchdog(void);
int i;
/* Send data. */
for (i = 0; i < n; i++) {
/* TODO: the '\n' -> '\n\r' translation should be done at the
receiver. Remove it when the serial driver removes it. */
if (s[i] == '\n')
early_putch('\r');
early_putch(s[i]);
reset_watchdog();
}
}
static struct console early_console_dev __initdata = {
.name = "early",
.write = early_console_write,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1
};
/* Register console for printk's, etc. */
int __init
init_etrax_debug(void)
int __init init_etrax_debug(void)
{
start_port(port);
/* Register an early console if a debug port was chosen. */
register_console(&early_console_dev);
#ifdef CONFIG_ETRAX_KGDB
start_port(kgdb_port);
#endif /* CONFIG_ETRAX_KGDB */