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u-boot/board/esd/cpci5200/cpci5200.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 2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2004
* Mark Jonas, Freescale Semiconductor, mark.jonas@motorola.com.
*
* 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
*/
/*
* cpci5200.c - main board support/init for the esd cpci5200.
*/
#include <common.h>
#include <mpc5xxx.h>
#include <pci.h>
#include <command.h>
#include <netdev.h>
#include "mt46v16m16-75.h"
void init_ata_reset(void);
static void sdram_start(int hi_addr)
{
long hi_addr_bit = hi_addr ? 0x01000000 : 0;
/* unlock mode register */
*(vu_long *) MPC5XXX_SDRAM_CTRL =
SDRAM_CONTROL | 0x80000000 | hi_addr_bit;
__asm__ volatile ("sync");
/* precharge all banks */
*(vu_long *) MPC5XXX_SDRAM_CTRL =
SDRAM_CONTROL | 0x80000002 | hi_addr_bit;
__asm__ volatile ("sync");
/* set mode register: extended mode */
*(vu_long *) MPC5XXX_SDRAM_MODE = SDRAM_EMODE;
__asm__ volatile ("sync");
/* set mode register: reset DLL */
*(vu_long *) MPC5XXX_SDRAM_MODE = SDRAM_MODE | 0x04000000;
__asm__ volatile ("sync");
/* precharge all banks */
*(vu_long *) MPC5XXX_SDRAM_CTRL =
SDRAM_CONTROL | 0x80000002 | hi_addr_bit;
__asm__ volatile ("sync");
/* auto refresh */
*(vu_long *) MPC5XXX_SDRAM_CTRL =
SDRAM_CONTROL | 0x80000004 | hi_addr_bit;
__asm__ volatile ("sync");
/* set mode register */
*(vu_long *) MPC5XXX_SDRAM_MODE = SDRAM_MODE;
__asm__ volatile ("sync");
/* normal operation */
*(vu_long *) MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | hi_addr_bit;
__asm__ volatile ("sync");
}
/*
* ATTENTION: Although partially referenced initdram does NOT make real use
* use of CONFIG_SYS_SDRAM_BASE. The code does not work if CONFIG_SYS_SDRAM_BASE
* is something else than 0x00000000.
*/
phys_size_t initdram(int board_type)
{
ulong dramsize = 0;
ulong test1, test2;
/* setup SDRAM chip selects */
*(vu_long *) MPC5XXX_SDRAM_CS0CFG = 0x0000001e; /* 2G at 0x0 */
*(vu_long *) MPC5XXX_SDRAM_CS1CFG = 0x80000000; /* disabled */
__asm__ volatile ("sync");
/* setup config registers */
*(vu_long *) MPC5XXX_SDRAM_CONFIG1 = SDRAM_CONFIG1;
*(vu_long *) MPC5XXX_SDRAM_CONFIG2 = SDRAM_CONFIG2;
__asm__ volatile ("sync");
/* set tap delay */
*(vu_long *) MPC5XXX_CDM_PORCFG = SDRAM_TAPDELAY;
__asm__ volatile ("sync");
/* find RAM size using SDRAM CS0 only */
sdram_start(0);
test1 = get_ram_size((long *) CONFIG_SYS_SDRAM_BASE, 0x80000000);
sdram_start(1);
test2 = get_ram_size((long *) CONFIG_SYS_SDRAM_BASE, 0x80000000);
if (test1 > test2) {
sdram_start(0);
dramsize = test1;
} else {
dramsize = test2;
}
/* memory smaller than 1MB is impossible */
if (dramsize < (1 << 20)) {
dramsize = 0;
}
/* set SDRAM CS0 size according to the amount of RAM found */
if (dramsize > 0) {
*(vu_long *) MPC5XXX_SDRAM_CS0CFG =
0x13 + __builtin_ffs(dramsize >> 20) - 1;
/* let SDRAM CS1 start right after CS0 */
*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize + 0x0000001e; /* 2G */
} else {
#if 0
*(vu_long *) MPC5XXX_SDRAM_CS0CFG = 0; /* disabled */
/* let SDRAM CS1 start right after CS0 */
*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize + 0x0000001e; /* 2G */
#else
*(vu_long *) MPC5XXX_SDRAM_CS0CFG =
0x13 + __builtin_ffs(0x08000000 >> 20) - 1;
/* let SDRAM CS1 start right after CS0 */
*(vu_long *) MPC5XXX_SDRAM_CS1CFG = 0x08000000 + 0x0000001e; /* 2G */
#endif
}
#if 0
/* find RAM size using SDRAM CS1 only */
sdram_start(0);
get_ram_size((ulong *) (CONFIG_SYS_SDRAM_BASE + dramsize), 0x80000000);
sdram_start(1);
get_ram_size((ulong *) (CONFIG_SYS_SDRAM_BASE + dramsize), 0x80000000);
sdram_start(0);
#endif
/* set SDRAM CS1 size according to the amount of RAM found */
*(vu_long *) MPC5XXX_SDRAM_CS1CFG = dramsize; /* disabled */
init_ata_reset();
return (dramsize);
}
int checkboard(void)
{
puts("Board: esd CPCI5200 (cpci5200)\n");
return 0;
}
void flash_preinit(void)
{
/*
* Now, when we are in RAM, enable flash write
* access for detection process.
* Note that CS_BOOT cannot be cleared when
* executing in flash.
*/
*(vu_long *) MPC5XXX_BOOTCS_CFG &= ~0x1; /* clear RO */
}
void flash_afterinit(ulong size)
{
if (size == 0x02000000) {
/* adjust mapping */
*(vu_long *) MPC5XXX_BOOTCS_START =
*(vu_long *) MPC5XXX_CS0_START =
START_REG(CONFIG_SYS_BOOTCS_START | size);
*(vu_long *) MPC5XXX_BOOTCS_STOP =
*(vu_long *) MPC5XXX_CS0_STOP =
STOP_REG(CONFIG_SYS_BOOTCS_START | size, size);
}
}
#ifdef CONFIG_PCI
static struct pci_controller hose;
extern void pci_mpc5xxx_init(struct pci_controller *);
void pci_init_board(void) {
pci_mpc5xxx_init(&hose);
}
#endif
#if defined(CONFIG_CMD_IDE) && defined (CONFIG_IDE_RESET)
void init_ide_reset(void)
{
debug("init_ide_reset\n");
/* Configure PSC1_4 as GPIO output for ATA reset */
*(vu_long *) MPC5XXX_WU_GPIO_ENABLE |= GPIO_PSC1_4;
*(vu_long *) MPC5XXX_WU_GPIO_DIR |= GPIO_PSC1_4;
}
void ide_set_reset(int idereset)
{
debug("ide_reset(%d)\n", idereset);
if (idereset) {
*(vu_long *) MPC5XXX_WU_GPIO_DATA_O &= ~GPIO_PSC1_4;
} else {
*(vu_long *) MPC5XXX_WU_GPIO_DATA_O |= GPIO_PSC1_4;
}
}
#endif
#define MPC5XXX_SIMPLEIO_GPIO_ENABLE (MPC5XXX_GPIO + 0x0004)
#define MPC5XXX_SIMPLEIO_GPIO_DIR (MPC5XXX_GPIO + 0x000C)
#define MPC5XXX_SIMPLEIO_GPIO_DATA_OUTPUT (MPC5XXX_GPIO + 0x0010)
#define MPC5XXX_SIMPLEIO_GPIO_DATA_INPUT (MPC5XXX_GPIO + 0x0014)
#define MPC5XXX_INTERRUPT_GPIO_ENABLE (MPC5XXX_GPIO + 0x0020)
#define MPC5XXX_INTERRUPT_GPIO_DIR (MPC5XXX_GPIO + 0x0028)
#define MPC5XXX_INTERRUPT_GPIO_DATA_OUTPUT (MPC5XXX_GPIO + 0x002C)
#define MPC5XXX_INTERRUPT_GPIO_STATUS (MPC5XXX_GPIO + 0x003C)
#define GPIO_WU6 0x40000000UL
#define GPIO_USB0 0x00010000UL
#define GPIO_USB9 0x08000000UL
#define GPIO_USB9S 0x00080000UL
void init_ata_reset(void)
{
debug("init_ata_reset\n");
/* Configure GPIO_WU6 as GPIO output for ATA reset */
*(vu_long *) MPC5XXX_WU_GPIO_DATA_O |= GPIO_WU6;
*(vu_long *) MPC5XXX_WU_GPIO_ENABLE |= GPIO_WU6;
*(vu_long *) MPC5XXX_WU_GPIO_DIR |= GPIO_WU6;
__asm__ volatile ("sync");
*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_DATA_OUTPUT &= ~GPIO_USB0;
*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_ENABLE |= GPIO_USB0;
*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_DIR |= GPIO_USB0;
__asm__ volatile ("sync");
*(vu_long *) MPC5XXX_INTERRUPT_GPIO_DATA_OUTPUT &= ~GPIO_USB9;
*(vu_long *) MPC5XXX_INTERRUPT_GPIO_ENABLE &= ~GPIO_USB9;
__asm__ volatile ("sync");
if ((*(vu_long *) MPC5XXX_INTERRUPT_GPIO_STATUS & GPIO_USB9S) == 0) {
*(vu_long *) MPC5XXX_SIMPLEIO_GPIO_DATA_OUTPUT |= GPIO_USB0;
__asm__ volatile ("sync");
}
}
int board_eth_init(bd_t *bis)
{
return pci_eth_init(bis);
}
int do_writepci(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
unsigned int addr;
unsigned int size;
int i;
volatile unsigned long *ptr;
addr = simple_strtol(argv[1], NULL, 16);
size = simple_strtol(argv[2], NULL, 16);
printf("\nWriting at addr %08x, size %08x.\n", addr, size);
while (1) {
ptr = (volatile unsigned long *)addr;
for (i = 0; i < (size >> 2); i++) {
*ptr++ = i;
}
/* Abort if ctrl-c was pressed */
if (ctrlc()) {
puts("\nAbort\n");
return 0;
}
putc('.');
}
return 0;
}
U_BOOT_CMD(writepci, 3, 1, do_writepci,
"Write some data to pcibus",
"<addr> <size>\n"
""
);
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