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u-boot/board/r360mpi/r360mpi.c
Wolfgang Denk 54841ab50c Make sure that argv[] argument pointers are not modified. 
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands.  Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".

This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:

int main (int argc, char **argv)
{
	while (--argc > 0 && **++argv == '-') {
/* ====> */	while (*++*argv) {
			switch (**argv) {
			case 'd':
				debug++;
				break;
			...
			default:
				usage ();
			}
		}
	}
	...
}

The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell.  With the modification, the compiler will prevent this with
an
	error: increment of read-only location '*argv'

N.B.: The code above can be trivially rewritten like this:

	while (--argc > 0 && **++argv == '-') {
		char *arg = *argv;
		while (*++arg) {
			switch (*arg) {
			...

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
2010-07-04 23:55:42 +02:00

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/*
* (C) Copyright 2001-2003
* 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 <config.h>
#include <mpc8xx.h>
#include <i2c.h>
#include <commproc.h>
#include <command.h>
#include <malloc.h>
#include <linux/types.h>
#include <linux/string.h> /* for strdup */
/*
* Memory Controller Using
*
* CS0 - Flash memory (0x40000000)
* CS1 - FLASH memory (0x????????)
* CS2 - SDRAM (0x00000000)
* CS3 -
* CS4 -
* CS5 -
* CS6 - PCMCIA device
* CS7 - PCMCIA device
*/
/* ------------------------------------------------------------------------- */
#define _not_used_ 0xffffffff
const uint sdram_table[]=
{
/* single read. (offset 0 in upm RAM) */
0x1f07fc04, 0xeeaefc04, 0x11adfc04, 0xefbbbc00,
0x1ff77c47,
/* MRS initialization (offset 5) */
0x1ff77c34, 0xefeabc34, 0x1fb57c35,
/* burst read. (offset 8 in upm RAM) */
0x1f07fc04, 0xeeaefc04, 0x10adfc04, 0xf0affc00,
0xf0affc00, 0xf1affc00, 0xefbbbc00, 0x1ff77c47,
_not_used_, _not_used_, _not_used_, _not_used_,
_not_used_, _not_used_, _not_used_, _not_used_,
/* single write. (offset 18 in upm RAM) */
0x1f27fc04, 0xeeaebc00, 0x01b93c04, 0x1ff77c47,
_not_used_, _not_used_, _not_used_, _not_used_,
/* burst write. (offset 20 in upm RAM) */
0x1f07fc04, 0xeeaebc00, 0x10ad7c00, 0xf0affc00,
0xf0affc00, 0xe1bbbc04, 0x1ff77c47, _not_used_,
_not_used_, _not_used_, _not_used_, _not_used_,
_not_used_, _not_used_, _not_used_, _not_used_,
/* refresh. (offset 30 in upm RAM) */
0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
0xfffffc84, 0xfffffc07, _not_used_, _not_used_,
_not_used_, _not_used_, _not_used_, _not_used_,
/* exception. (offset 3c in upm RAM) */
0x7ffffc07, _not_used_, _not_used_, _not_used_ };
/* ------------------------------------------------------------------------- */
/*
* Check Board Identity:
*/
int checkboard (void)
{
puts ("Board: R360 MPI Board\n");
return 0;
}
/* ------------------------------------------------------------------------- */
static long int dram_size (long int, long int *, long int);
/* ------------------------------------------------------------------------- */
phys_size_t initdram (int board_type)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
long int size8, size9;
long int size_b0 = 0;
unsigned long reg;
upmconfig (UPMA, (uint *) sdram_table,
sizeof (sdram_table) / sizeof (uint));
/*
* Preliminary prescaler for refresh (depends on number of
* banks): This value is selected for four cycles every 62.4 us
* with two SDRAM banks or four cycles every 31.2 us with one
* bank. It will be adjusted after memory sizing.
*/
memctl->memc_mptpr = CONFIG_SYS_MPTPR_2BK_8K;
memctl->memc_mar = 0x00000088;
/*
* Map controller bank 2 to the SDRAM bank at
* preliminary address - these have to be modified after the
* SDRAM size has been determined.
*/
memctl->memc_or2 = CONFIG_SYS_OR2_PRELIM;
memctl->memc_br2 = CONFIG_SYS_BR2_PRELIM;
memctl->memc_mamr = CONFIG_SYS_MAMR_8COL & (~(MAMR_PTAE)); /* no refresh yet */
udelay (200);
/* perform SDRAM initializsation sequence */
memctl->memc_mcr = 0x80004105; /* SDRAM bank 0 */
udelay (200);
memctl->memc_mcr = 0x80004230; /* SDRAM bank 0 - execute twice */
udelay (200);
memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
udelay (1000);
/*
* Check Bank 2 Memory Size for re-configuration
*
* try 8 column mode
*/
size8 = dram_size (CONFIG_SYS_MAMR_8COL, (long *) SDRAM_BASE2_PRELIM,
SDRAM_MAX_SIZE);
udelay (1000);
/*
* try 9 column mode
*/
size9 = dram_size (CONFIG_SYS_MAMR_9COL, (long *) SDRAM_BASE2_PRELIM,
SDRAM_MAX_SIZE);
if (size8 < size9) { /* leave configuration at 9 columns */
size_b0 = size9;
/* debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20); */
} else { /* back to 8 columns */
size_b0 = size8;
memctl->memc_mamr = CONFIG_SYS_MAMR_8COL;
udelay (500);
/* debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20); */
}
udelay (1000);
/*
* Adjust refresh rate depending on SDRAM type, both banks
* For types > 128 MBit leave it at the current (fast) rate
*/
if ((size_b0 < 0x02000000)) {
/* reduce to 15.6 us (62.4 us / quad) */
memctl->memc_mptpr = CONFIG_SYS_MPTPR_2BK_4K;
udelay (1000);
}
/*
* Final mapping
*/
memctl->memc_or1 = ((-size_b0) & 0xFFFF0000) | CONFIG_SYS_OR_TIMING_SDRAM;
memctl->memc_br1 = (CONFIG_SYS_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
/* adjust refresh rate depending on SDRAM type, one bank */
reg = memctl->memc_mptpr;
reg >>= 1; /* reduce to CONFIG_SYS_MPTPR_1BK_8K / _4K */
memctl->memc_mptpr = reg;
udelay (10000);
#ifdef CONFIG_CAN_DRIVER
/* Initialize OR3 / BR3 */
memctl->memc_or3 = CONFIG_SYS_OR3_CAN; /* switch GPLB_5 to GPLA_5 */
memctl->memc_br3 = CONFIG_SYS_BR3_CAN;
/* Initialize MBMR */
memctl->memc_mbmr = MBMR_GPL_B4DIS; /* GPL_B4 works as UPWAITB */
/* Initialize UPMB for CAN: single read */
memctl->memc_mdr = 0xFFFFC004;
memctl->memc_mcr = 0x0100 | UPMB;
memctl->memc_mdr = 0x0FFFD004;
memctl->memc_mcr = 0x0101 | UPMB;
memctl->memc_mdr = 0x0FFFC000;
memctl->memc_mcr = 0x0102 | UPMB;
memctl->memc_mdr = 0x3FFFC004;
memctl->memc_mcr = 0x0103 | UPMB;
memctl->memc_mdr = 0xFFFFDC05;
memctl->memc_mcr = 0x0104 | UPMB;
/* Initialize UPMB for CAN: single write */
memctl->memc_mdr = 0xFFFCC004;
memctl->memc_mcr = 0x0118 | UPMB;
memctl->memc_mdr = 0xCFFCD004;
memctl->memc_mcr = 0x0119 | UPMB;
memctl->memc_mdr = 0x0FFCC000;
memctl->memc_mcr = 0x011A | UPMB;
memctl->memc_mdr = 0x7FFCC004;
memctl->memc_mcr = 0x011B | UPMB;
memctl->memc_mdr = 0xFFFDCC05;
memctl->memc_mcr = 0x011C | UPMB;
#endif
return (size_b0);
}
/* ------------------------------------------------------------------------- */
/*
* Check memory range for valid RAM. A simple memory test determines
* the actually available RAM size between addresses `base' and
* `base + maxsize'. Some (not all) hardware errors are detected:
* - short between address lines
* - short between data lines
*/
static long int dram_size (long int mamr_value,
long int *base, long int maxsize)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
memctl->memc_mamr = mamr_value;
return (get_ram_size(base, maxsize));
}
/* ------------------------------------------------------------------------- */
void r360_i2c_lcd_write (uchar data0, uchar data1)
{
if (i2c_write (CONFIG_SYS_I2C_LCD_ADDR, data0, 1, &data1, 1)) {
printf("Can't write lcd data 0x%02X 0x%02X.\n", data0, data1);
}
}
/* ------------------------------------------------------------------------- */
/*-----------------------------------------------------------------------
* Keyboard Controller
*/
/* Number of bytes returned from Keyboard Controller */
#define KEYBD_KEY_MAX 16 /* maximum key number */
#define KEYBD_DATALEN ((KEYBD_KEY_MAX + 7) / 8) /* normal key scan data */
static uchar *key_match (uchar *);
int misc_init_r (void)
{
char kbd_data[KEYBD_DATALEN];
char keybd_env[2 * KEYBD_DATALEN + 1];
char *str;
int i;
i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
i2c_read (CONFIG_SYS_I2C_KEY_ADDR, 0, 0, (uchar *)kbd_data, KEYBD_DATALEN);
for (i = 0; i < KEYBD_DATALEN; ++i) {
sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
}
setenv ("keybd", keybd_env);
str = strdup ((char *)key_match ((uchar *)keybd_env)); /* decode keys */
#ifdef CONFIG_PREBOOT /* automatically configure "preboot" command on key match */
setenv ("preboot", str); /* set or delete definition */
#endif /* CONFIG_PREBOOT */
if (str != NULL) {
free (str);
}
return (0);
}
/*-----------------------------------------------------------------------
* Check if pressed key(s) match magic sequence,
* and return the command string associated with that key(s).
*
* If no key press was decoded, NULL is returned.
*
* Note: the first character of the argument will be overwritten with
* the "magic charcter code" of the decoded key(s), or '\0'.
*
*
* Note: the string points to static environment data and must be
* saved before you call any function that modifies the environment.
*/
#ifdef CONFIG_PREBOOT
static uchar kbd_magic_prefix[] = "key_magic";
static uchar kbd_command_prefix[] = "key_cmd";
static uchar *key_match (uchar * kbd_str)
{
uchar magic[sizeof (kbd_magic_prefix) + 1];
uchar cmd_name[sizeof (kbd_command_prefix) + 1];
uchar *str, *suffix;
uchar *kbd_magic_keys;
char *cmd;
/*
* The following string defines the characters that can pe appended
* to "key_magic" to form the names of environment variables that
* hold "magic" key codes, i. e. such key codes that can cause
* pre-boot actions. If the string is empty (""), then only
* "key_magic" is checked (old behaviour); the string "125" causes
* checks for "key_magic1", "key_magic2" and "key_magic5", etc.
*/
if ((kbd_magic_keys = (uchar *)getenv ("magic_keys")) != NULL) {
/* loop over all magic keys;
* use '\0' suffix in case of empty string
*/
for (suffix = kbd_magic_keys;
*suffix || suffix == kbd_magic_keys;
++suffix) {
sprintf ((char *)magic, "%s%c", kbd_magic_prefix, *suffix);
#if 0
printf ("### Check magic \"%s\"\n", magic);
#endif
if ((str = (uchar *)getenv ((char *)magic)) != 0) {
#if 0
printf ("### Compare \"%s\" \"%s\"\n",
kbd_str, str);
#endif
if (strcmp ((char *)kbd_str, (char *)str) == 0) {
sprintf ((char *)cmd_name, "%s%c",
kbd_command_prefix,
*suffix);
if ((cmd = getenv ((char *)cmd_name)) != 0) {
#if 0
printf ("### Set PREBOOT to $(%s): \"%s\"\n",
cmd_name, cmd);
#endif
return ((uchar *)cmd);
}
}
}
}
}
#if 0
printf ("### Delete PREBOOT\n");
#endif
*kbd_str = '\0';
return (NULL);
}
#endif /* CONFIG_PREBOOT */
/* Read Keyboard status */
int do_kbd (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
uchar kbd_data[KEYBD_DATALEN];
uchar keybd_env[2 * KEYBD_DATALEN + 1];
int i;
i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
/* Read keys */
i2c_read (CONFIG_SYS_I2C_KEY_ADDR, 0, 0, kbd_data, KEYBD_DATALEN);
puts ("Keys:");
for (i = 0; i < KEYBD_DATALEN; ++i) {
sprintf ((char *)(keybd_env + i + i), "%02X", kbd_data[i]);
printf (" %02x", kbd_data[i]);
}
putc ('\n');
setenv ("keybd", (char *)keybd_env);
return 0;
}
U_BOOT_CMD(
kbd, 1, 1, do_kbd,
"read keyboard status",
""
);
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