/* Serialport functions for debugging
*
* Copyright (c) 2000 Axis Communications AB
*
* Authors: Bjorn Wesen
*
* Exports:
* console_print_etrax(char *buf)
* int getDebugChar()
* putDebugChar(int)
* enableDebugIRQ()
* init_etrax_debug()
*
* $Log: debugport.c,v $
* Revision 1.19 2004/10/21 07:26:16 starvik
* Made it possible to specify console settings on kernel command line.
*
* Revision 1.18 2004/10/19 13:07:37 starvik
* Merge of Linux 2.6.9
*
* Revision 1.17 2004/09/29 10:33:46 starvik
* Resolved a dealock when printing debug from kernel.
*
* Revision 1.16 2004/08/24 06:12:19 starvik
* Whitespace cleanup
*
* Revision 1.15 2004/08/16 12:37:19 starvik
* Merge of Linux 2.6.8
*
* Revision 1.14 2004/05/17 13:11:29 starvik
* Disable DMA until real serial driver is up
*
* Revision 1.13 2004/05/14 07:58:01 starvik
* Merge of changes from 2.4
*
* Revision 1.12 2003/09/11 07:29:49 starvik
* Merge of Linux 2.6.0-test5
*
* Revision 1.11 2003/07/07 09:53:36 starvik
* Revert all the 2.5.74 merge changes to make the console work again
*
* Revision 1.9 2003/02/17 17:07:23 starvik
* Solved the problem with corrupted debug output (from Linux 2.4)
* * Wait until DMA, FIFO and pipe is empty before and after transmissions
* * Buffer data until a FIFO flush can be triggered.
*
* Revision 1.8 2003/01/22 06:48:36 starvik
* Fixed warnings issued by GCC 3.2.1
*
* Revision 1.7 2002/12/12 08:26:32 starvik
* Don't use C-comments inside CVS comments
*
* Revision 1.6 2002/12/11 15:42:02 starvik
* Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/
*
* Revision 1.5 2002/11/20 06:58:03 starvik
* Compiles with kgdb
*
* Revision 1.4 2002/11/19 14:35:24 starvik
* Changes from linux 2.4
* Changed struct initializer syntax to the currently prefered notation
*
* Revision 1.3 2002/11/06 09:47:03 starvik
* Modified for new interrupt macros
*
* Revision 1.2 2002/01/21 15:21:50 bjornw
* Update for kdev_t changes
*
* Revision 1.6 2001/04/17 13:58:39 orjanf
* * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB.
*
* Revision 1.5 2001/03/26 14:22:05 bjornw
* Namechange of some config options
*
* Revision 1.4 2000/10/06 12:37:26 bjornw
* Use physical addresses when talking to DMA
*
*
*/
#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/arch/svinto.h>
#include <asm/io.h> /* Get SIMCOUT. */
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)
},
{
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)
},
{
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)
},
{
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)
}
};
static struct tty_driver *serial_driver;
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
/* Used by serial.c to register a debug_write_function so that the normal
* serial driver is used for kernel debug output
*/
typedef int (*debugport_write_function)(int i, const char *buf, unsigned int len);
debugport_write_function debug_write_function = NULL;
static void
start_port(void)
{
unsigned long rec_ctrl = 0;
unsigned long tr_ctrl = 0;
if (!port)
return;
if (port->started)
return;
port->started = 1;
if (port->index == 0)
{
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
}
else if (port->index == 1)
{
genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
}
else if (port->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;
*port->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 (port->baudrate)
{
case 0:
case 115200:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
break;
case 1200:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c1200Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c1200Hz);
break;
case 2400:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c2400Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c2400Hz);
break;
case 4800:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c4800Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c4800Hz);
break;
case 9600:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c9600Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c9600Hz);
break;
case 19200:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c19k2Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c19k2Hz);
break;
case 38400:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c38k4Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c38k4Hz);
break;
case 57600:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c57k6Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c57k6Hz);
break;
default:
*port->baud =
IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
break;
}
if (port->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 (port->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 (port->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);
}
*port->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;
*port->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;
local_irq_save(flags);
/* Send data */
for (i = 0; i < len; i++) {
/* Wait until transmitter is ready and send.*/
while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
;
*port->write = buf[i];
}
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
start_port();
#ifdef CONFIG_ETRAX_KGDB
/* kgdb needs to output debug info using the gdb protocol */
putDebugString(buf, len);
return;
#endif
if (debug_write_function)
debug_write_function(co->index, buf, len);
else
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;
do {
readval = *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)
{
while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
;
*port->write = val;
}
/* Enable irq for receiving chars on the debug port, used by kgdb */
void
enableDebugIRQ(void)
{
*R_IRQ_MASK1_SET = 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);
*port->rec_ctrl = IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
}
static struct tty_driver*
etrax_console_device(struct console* co, int *index)
{
return serial_driver;
}
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();
}
return 0;
}
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) {
if (!port) {
register_console(&sercons0);
register_console(&sercons1);
register_console(&sercons2);
register_console(&sercons3);
unregister_console(&sercons);
}
return 0;
}
first = 0;
if (port)
register_console(&sercons);
return 0;
}
int __init
init_console(void)
{
serial_driver = alloc_tty_driver(1);
if (!serial_driver)
return -ENOMEM;
return 0;
}
__initcall(init_etrax_debug);
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