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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2003, Axis Communications AB.
*/
#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>
#include <hwregs/dma_defs.h>
#include <mach/pinmux.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
},
#if CONFIG_ETRAX_SERIAL_PORTS == 5
{
4,
regi_ser4,
0,
115200,
'N',
8
},
#endif
};
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];
#elif defined(CONFIG_ETRAX_KGDB_PORT4)
&ports[4];
#else
NULL;
#endif
#endif
static void start_port(struct dbg_port *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;
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);
#if CONFIG_ETRAX_SERIAL_PORTS == 5
else if (p->nbr == 4)
crisv32_pinmux_alloc_fixed(pinmux_ser4);
#endif
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);
}
#ifdef CONFIG_ETRAX_KGDB
/* Use polling to get a single character from the kernel debug port */
int getDebugChar(void)
{
reg_ser_rs_stat_din stat;
reg_ser_rw_ack_intr ack_intr = { 0 };
do {
stat = REG_RD(ser, kgdb_port->instance, rs_stat_din);
} while (!stat.dav);
/* Ack the data_avail interrupt. */
ack_intr.dav = 1;
REG_WR(ser, kgdb_port->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_stat_din stat;
do {
stat = REG_RD(ser, kgdb_port->instance, r_stat_din);
} while (!stat.tr_rdy);
REG_WR_INT(ser, kgdb_port->instance, rw_dout, 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)
{
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 */
return 0;
}
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