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env: Add a baudrate env handler

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Remove the hard-coded baudrate handler and use a callback instead

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger 2012-12-11 22:16:27 -06:00 • committed by Tom Rini
parent a9f51c9b43
commit 32057717e0
3 changed files with 71 additions and 47 deletions
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47
common/cmd_nvedit.c
View file

@ -77,12 +77,6 @@ ulong load_addr = CONFIG_SYS_LOAD_ADDR; /* Default Load Address */
ulong save_addr; /* Default Save Address */ ulong save_addr; /* Default Save Address */
ulong save_size; /* Default Save Size (in bytes) */ ulong save_size; /* Default Save Size (in bytes) */
/*
* Table with supported baudrates (defined in config_xyz.h)
*/
static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
#define N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
/* /*
* This variable is incremented on each do_env_set(), so it can * This variable is incremented on each do_env_set(), so it can
* be used via get_env_id() as an indication, if the environment * be used via get_env_id() as an indication, if the environment
@ -275,47 +269,6 @@ int env_change_ok(const ENTRY *item, const char *newval, enum env_op op,
} }
} }
#endif #endif
/*
* When we change baudrate, or we are doing an env default -a
* (which will erase all variables prior to calling this),
* we want the baudrate to actually change - for real.
*/
if (op != env_op_create || /* variable exists */
(flag & H_NOCLEAR) == 0) { /* or env is clear */
/*
* Switch to new baudrate if new baudrate is supported
*/
if (strcmp(name, "baudrate") == 0) {
int baudrate = simple_strtoul(newval, NULL, 10);
int i;
for (i = 0; i < N_BAUDRATES; ++i) {
if (baudrate == baudrate_table[i])
break;
}
if (i == N_BAUDRATES) {
if ((flag & H_FORCE) == 0)
printf("## Baudrate %d bps not "
"supported\n", baudrate);
return 1;
}
if (gd->baudrate == baudrate) {
/* If unchanged, we just say it's OK */
return 0;
}
printf("## Switch baudrate to %d bps and"
"press ENTER ...\n", baudrate);
udelay(50000);
gd->baudrate = baudrate;
#if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
gd->bd->bi_baudrate = baudrate;
#endif
serial_setbrg();
udelay(50000);
while (getc() != '\r')
;
}
}
/* /*
* Some variables should be updated when the corresponding * Some variables should be updated when the corresponding

70
drivers/serial/serial.c
View file

@ -22,6 +22,7 @@
*/ */
#include <common.h> #include <common.h>
#include <environment.h>
#include <serial.h> #include <serial.h>
#include <stdio_dev.h> #include <stdio_dev.h>
#include <post.h> #include <post.h>
@ -32,6 +33,11 @@ DECLARE_GLOBAL_DATA_PTR;
static struct serial_device *serial_devices; static struct serial_device *serial_devices;
static struct serial_device *serial_current; static struct serial_device *serial_current;
/*
* Table with supported baudrates (defined in config_xyz.h)
*/
static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
#define N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
/** /**
* serial_null() - Void registration routine of a serial driver * serial_null() - Void registration routine of a serial driver
@ -45,6 +51,70 @@ static void serial_null(void)
{ {
} }
/**
* on_baudrate() - Update the actual baudrate when the env var changes
*
* This will check for a valid baudrate and only apply it if valid.
*/
static int on_baudrate(const char *name, const char *value, enum env_op op,
int flags)
{
int i;
int baudrate;
switch (op) {
case env_op_create:
case env_op_overwrite:
/*
* Switch to new baudrate if new baudrate is supported
*/
baudrate = simple_strtoul(value, NULL, 10);
/* Not actually changing */
if (gd->baudrate == baudrate)
return 0;
for (i = 0; i < N_BAUDRATES; ++i) {
if (baudrate == baudrate_table[i])
break;
}
if (i == N_BAUDRATES) {
if ((flags & H_FORCE) == 0)
printf("## Baudrate %d bps not supported\n",
baudrate);
return 1;
}
if ((flags & H_INTERACTIVE) != 0) {
printf("## Switch baudrate to %d"
" bps and press ENTER ...\n", baudrate);
udelay(50000);
}
gd->baudrate = baudrate;
#if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
gd->bd->bi_baudrate = baudrate;
#endif
serial_setbrg();
udelay(50000);
if ((flags & H_INTERACTIVE) != 0)
while (1) {
if (getc() == '\r')
break;
}
return 0;
case env_op_delete:
printf("## Baudrate may not be deleted\n");
return 1;
default:
return 0;
}
}
U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
/** /**
* serial_initfunc() - Forward declare of driver registration routine * serial_initfunc() - Forward declare of driver registration routine
* @name: Name of the real driver registration routine. * @name: Name of the real driver registration routine.

1
include/env_callback.h
View file

@ -39,6 +39,7 @@
* a new association in the ".callbacks" environment variable. * a new association in the ".callbacks" environment variable.
*/ */
#define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \ #define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \
"baudrate:baudrate," \
"bootfile:bootfile," \ "bootfile:bootfile," \
CONFIG_ENV_CALLBACK_LIST_STATIC CONFIG_ENV_CALLBACK_LIST_STATIC