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u-boot/common/serial.c
Mike Frysinger 7b826c2f35 serial: implement common uart post test 
The current arch/driver specific UART posts basically boil down to setting
the UART to loop back mode, then reading and writing data.  If we ignore
the loop back part, the rest can be built upon the existing common serial
API.  So let's do just that.

First add a call back for serial drivers to implement loop back control.
Then write a post test that walks all of the serial drivers, puts them
into loop back mode, and verifies that reading/writing at all the diff
baud rates is OK.

If a serial driver doesn't support loop back mode (either it can't or
it hasn't done so yet), then skip it.  This should allow for people to
easily migrate to the new post test with existing serial drivers.

I haven't touched the few already existing uart post tests as I don't
the hardware or knowledge of converting them over.  So I've marked the
new test as weak which will allow the existing tests to override the
default until they are converted.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-07-26 16:39:03 +02:00

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/*
* (C) Copyright 2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <serial.h>
#include <stdio_dev.h>
#include <post.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
static struct serial_device *serial_devices = NULL;
static struct serial_device *serial_current = NULL;
void serial_register(struct serial_device *dev)
{
#ifdef CONFIG_NEEDS_MANUAL_RELOC
dev->init += gd->reloc_off;
dev->setbrg += gd->reloc_off;
dev->getc += gd->reloc_off;
dev->tstc += gd->reloc_off;
dev->putc += gd->reloc_off;
dev->puts += gd->reloc_off;
#endif
dev->next = serial_devices;
serial_devices = dev;
}
void serial_initialize (void)
{
#if defined(CONFIG_8xx_CONS_SMC1) || defined(CONFIG_8xx_CONS_SMC2)
serial_register (&serial_smc_device);
#endif
#if defined(CONFIG_8xx_CONS_SCC1) || defined(CONFIG_8xx_CONS_SCC2) \
|| defined(CONFIG_8xx_CONS_SCC3) || defined(CONFIG_8xx_CONS_SCC4)
serial_register (&serial_scc_device);
#endif
#if defined(CONFIG_SYS_NS16550_SERIAL)
#if defined(CONFIG_SYS_NS16550_COM1)
serial_register(&eserial1_device);
#endif
#if defined(CONFIG_SYS_NS16550_COM2)
serial_register(&eserial2_device);
#endif
#if defined(CONFIG_SYS_NS16550_COM3)
serial_register(&eserial3_device);
#endif
#if defined(CONFIG_SYS_NS16550_COM4)
serial_register(&eserial4_device);
#endif
#endif /* CONFIG_SYS_NS16550_SERIAL */
#if defined (CONFIG_FFUART)
serial_register(&serial_ffuart_device);
#endif
#if defined (CONFIG_BTUART)
serial_register(&serial_btuart_device);
#endif
#if defined (CONFIG_STUART)
serial_register(&serial_stuart_device);
#endif
#if defined(CONFIG_S3C2410)
serial_register(&s3c24xx_serial0_device);
serial_register(&s3c24xx_serial1_device);
serial_register(&s3c24xx_serial2_device);
#endif
#if defined(CONFIG_S5P)
serial_register(&s5p_serial0_device);
serial_register(&s5p_serial1_device);
serial_register(&s5p_serial2_device);
serial_register(&s5p_serial3_device);
#endif
#if defined(CONFIG_MPC512X)
#if defined(CONFIG_SYS_PSC1)
serial_register(&serial1_device);
#endif
#if defined(CONFIG_SYS_PSC3)
serial_register(&serial3_device);
#endif
#if defined(CONFIG_SYS_PSC4)
serial_register(&serial4_device);
#endif
#if defined(CONFIG_SYS_PSC6)
serial_register(&serial6_device);
#endif
#endif
serial_assign (default_serial_console ()->name);
}
void serial_stdio_init (void)
{
struct stdio_dev dev;
struct serial_device *s = serial_devices;
while (s) {
memset (&dev, 0, sizeof (dev));
strcpy (dev.name, s->name);
dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
dev.start = s->init;
dev.stop = s->uninit;
dev.putc = s->putc;
dev.puts = s->puts;
dev.getc = s->getc;
dev.tstc = s->tstc;
stdio_register (&dev);
s = s->next;
}
}
int serial_assign (char *name)
{
struct serial_device *s;
for (s = serial_devices; s; s = s->next) {
if (strcmp (s->name, name) == 0) {
serial_current = s;
return 0;
}
}
return 1;
}
void serial_reinit_all (void)
{
struct serial_device *s;
for (s = serial_devices; s; s = s->next) {
s->init ();
}
}
int serial_init (void)
{
if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
struct serial_device *dev = default_serial_console ();
return dev->init ();
}
return serial_current->init ();
}
void serial_setbrg (void)
{
if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
struct serial_device *dev = default_serial_console ();
dev->setbrg ();
return;
}
serial_current->setbrg ();
}
int serial_getc (void)
{
if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
struct serial_device *dev = default_serial_console ();
return dev->getc ();
}
return serial_current->getc ();
}
int serial_tstc (void)
{
if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
struct serial_device *dev = default_serial_console ();
return dev->tstc ();
}
return serial_current->tstc ();
}
void serial_putc (const char c)
{
if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
struct serial_device *dev = default_serial_console ();
dev->putc (c);
return;
}
serial_current->putc (c);
}
void serial_puts (const char *s)
{
if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
struct serial_device *dev = default_serial_console ();
dev->puts (s);
return;
}
serial_current->puts (s);
}
#if CONFIG_POST & CONFIG_SYS_POST_UART
static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
/* Mark weak until post/cpu/.../uart.c migrate over */
__weak
int uart_post_test(int flags)
{
unsigned char c;
int ret, saved_baud, b;
struct serial_device *saved_dev, *s;
bd_t *bd = gd->bd;
/* Save current serial state */
ret = 0;
saved_dev = serial_current;
saved_baud = bd->bi_baudrate;
for (s = serial_devices; s; s = s->next) {
/* If this driver doesn't support loop back, skip it */
if (!s->loop)
continue;
/* Test the next device */
serial_current = s;
ret = serial_init();
if (ret)
goto done;
/* Consume anything that happens to be queued */
while (serial_tstc())
serial_getc();
/* Enable loop back */
s->loop(1);
/* Test every available baud rate */
for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
bd->bi_baudrate = bauds[b];
serial_setbrg();
/*
* Stick to printable chars to avoid issues:
* - terminal corruption
* - serial program reacting to sequences and sending
* back random extra data
* - most serial drivers add in extra chars (like \r\n)
*/
for (c = 0x20; c < 0x7f; ++c) {
/* Send it out */
serial_putc(c);
/* Make sure it's the same one */
ret = (c != serial_getc());
if (ret) {
s->loop(0);
goto done;
}
/* Clean up the output in case it was sent */
serial_putc('\b');
ret = ('\b' != serial_getc());
if (ret) {
s->loop(0);
goto done;
}
}
}
/* Disable loop back */
s->loop(0);
/* XXX: There is no serial_uninit() !? */
if (s->uninit)
s->uninit();
}
done:
/* Restore previous serial state */
serial_current = saved_dev;
bd->bi_baudrate = saved_baud;
serial_reinit_all();
serial_setbrg();
return ret;
}
#endif
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