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u-boot/examples/standalone/82559_eeprom.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

357 lines
8.2 KiB
C
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/*
* Copyright 1998-2001 by Donald Becker.
* This software may be used and distributed according to the terms of
* the GNU General Public License (GPL), incorporated herein by reference.
* Contact the author for use under other terms.
*
* This program must be compiled with "-O"!
* See the bottom of this file for the suggested compile-command.
*
* The author may be reached as becker@scyld.com, or C/O
* Scyld Computing Corporation
* 410 Severn Ave., Suite 210
* Annapolis MD 21403
*
* Common-sense licensing statement: Using any portion of this program in
* your own program means that you must give credit to the original author
* and release the resulting code under the GPL.
*/
#define _PPC_STRING_H_ /* avoid unnecessary str/mem functions */
#include <common.h>
#include <exports.h>
#include <asm/io.h>
/* Default EEPROM for i82559 */
static unsigned short default_eeprom[64] = {
0x0100, 0x0302, 0x0504, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0x40c0, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
};
static unsigned short eeprom[256];
static int eeprom_size = 64;
static int eeprom_addr_size = 6;
static int debug = 0;
static inline unsigned short swap16(unsigned short x)
{
return (((x & 0xff) << 8) | ((x & 0xff00) >> 8));
}
void * memcpy(void * dest,const void *src,size_t count)
{
char *tmp = (char *) dest, *s = (char *) src;
while (count--)
*tmp++ = *s++;
return dest;
}
/* The EEPROM commands include the alway-set leading bit. */
#define EE_WRITE_CMD (5)
#define EE_READ_CMD (6)
#define EE_ERASE_CMD (7)
/* Serial EEPROM section. */
#define EE_SHIFT_CLK 0x01 /* EEPROM shift clock. */
#define EE_CS 0x02 /* EEPROM chip select. */
#define EE_DATA_WRITE 0x04 /* EEPROM chip data in. */
#define EE_DATA_READ 0x08 /* EEPROM chip data out. */
#define EE_ENB (0x4800 | EE_CS)
#define EE_WRITE_0 0x4802
#define EE_WRITE_1 0x4806
#define EE_OFFSET 14
/* Delay between EEPROM clock transitions. */
#define eeprom_delay(ee_addr) inw(ee_addr)
/* Wait for the EEPROM to finish the previous operation. */
static int eeprom_busy_poll(long ee_ioaddr)
{
int i;
outw(EE_ENB, ee_ioaddr);
for (i = 0; i < 10000; i++) /* Typical 2000 ticks */
if (inw(ee_ioaddr) & EE_DATA_READ)
break;
return i;
}
/* This executes a generic EEPROM command, typically a write or write enable.
It returns the data output from the EEPROM, and thus may also be used for
reads. */
static int do_eeprom_cmd(long ioaddr, int cmd, int cmd_len)
{
unsigned retval = 0;
long ee_addr = ioaddr + EE_OFFSET;
if (debug > 1)
printf(" EEPROM op 0x%x: ", cmd);
outw(EE_ENB | EE_SHIFT_CLK, ee_addr);
/* Shift the command bits out. */
do {
short dataval = (cmd & (1 << cmd_len)) ? EE_WRITE_1 : EE_WRITE_0;
outw(dataval, ee_addr);
eeprom_delay(ee_addr);
if (debug > 2)
printf("%X", inw(ee_addr) & 15);
outw(dataval | EE_SHIFT_CLK, ee_addr);
eeprom_delay(ee_addr);
retval = (retval << 1) | ((inw(ee_addr) & EE_DATA_READ) ? 1 : 0);
} while (--cmd_len >= 0);
#if 0
outw(EE_ENB, ee_addr);
#endif
/* Terminate the EEPROM access. */
outw(EE_ENB & ~EE_CS, ee_addr);
if (debug > 1)
printf(" EEPROM result is 0x%5.5x.\n", retval);
return retval;
}
static int read_eeprom(long ioaddr, int location, int addr_len)
{
return do_eeprom_cmd(ioaddr, ((EE_READ_CMD << addr_len) | location)
<< 16 , 3 + addr_len + 16) & 0xffff;
}
static void write_eeprom(long ioaddr, int index, int value, int addr_len)
{
long ee_ioaddr = ioaddr + EE_OFFSET;
int i;
/* Poll for previous op finished. */
eeprom_busy_poll(ee_ioaddr); /* Typical 0 ticks */
/* Enable programming modes. */
do_eeprom_cmd(ioaddr, (0x4f << (addr_len-4)), 3 + addr_len);
/* Do the actual write. */
do_eeprom_cmd(ioaddr,
(((EE_WRITE_CMD<<addr_len) | index)<<16) | (value & 0xffff),
3 + addr_len + 16);
/* Poll for write finished. */
i = eeprom_busy_poll(ee_ioaddr); /* Typical 2000 ticks */
if (debug)
printf(" Write finished after %d ticks.\n", i);
/* Disable programming. This command is not instantaneous, so we check
for busy before the next op. */
do_eeprom_cmd(ioaddr, (0x40 << (addr_len-4)), 3 + addr_len);
eeprom_busy_poll(ee_ioaddr);
}
static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr)
{
unsigned short checksum = 0;
int size_test;
int i;
printf("Resetting i82559 EEPROM @ 0x%08lx ... ", ioaddr);
size_test = do_eeprom_cmd(ioaddr, (EE_READ_CMD << 8) << 16, 27);
eeprom_addr_size = (size_test & 0xffe0000) == 0xffe0000 ? 8 : 6;
eeprom_size = 1 << eeprom_addr_size;
memcpy(eeprom, default_eeprom, sizeof default_eeprom);
for (i = 0; i < 3; i++)
eeprom[i] = (hwaddr[i*2+1]<<8) + hwaddr[i*2];
/* Recalculate the checksum. */
for (i = 0; i < eeprom_size - 1; i++)
checksum += eeprom[i];
eeprom[i] = 0xBABA - checksum;
for (i = 0; i < eeprom_size; i++)
write_eeprom(ioaddr, i, eeprom[i], eeprom_addr_size);
for (i = 0; i < eeprom_size; i++)
if (read_eeprom(ioaddr, i, eeprom_addr_size) != eeprom[i]) {
printf("failed\n");
return 1;
}
printf("done\n");
return 0;
}
static unsigned int hatoi(char *p, char **errp)
{
unsigned int res = 0;
while (1) {
switch (*p) {
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
res |= (*p - 'a' + 10);
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
res |= (*p - 'A' + 10);
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
res |= (*p - '0');
break;
default:
if (errp) {
*errp = p;
}
return res;
}
p++;
if (*p == 0) {
break;
}
res <<= 4;
}
if (errp) {
*errp = NULL;
}
return res;
}
static unsigned char *gethwaddr(char *in, unsigned char *out)
{
char tmp[3];
int i;
char *err;
for (i=0;i<6;i++) {
if (in[i*3+2] == 0 && i == 5) {
out[i] = hatoi(&in[i*3], &err);
if (err) {
return NULL;
}
} else if (in[i*3+2] == ':' && i < 5) {
tmp[0] = in[i*3];
tmp[1] = in[i*3+1];
tmp[2] = 0;
out[i] = hatoi(tmp, &err);
if (err) {
return NULL;
}
} else {
return NULL;
}
}
return out;
}
static u32
read_config_dword(int bus, int dev, int func, int reg)
{
u32 res;
outl(0x80000000|(bus&0xff)<<16|(dev&0x1f)<<11|(func&7)<<8|(reg&0xfc),
0xcf8);
res = inl(0xcfc);
outl(0, 0xcf8);
return res;
}
static u16
read_config_word(int bus, int dev, int func, int reg)
{
u32 res;
outl(0x80000000|(bus&0xff)<<16|(dev&0x1f)<<11|(func&7)<<8|(reg&0xfc),
0xcf8);
res = inw(0xcfc + (reg & 2));
outl(0, 0xcf8);
return res;
}
static void
write_config_word(int bus, int dev, int func, int reg, u16 data)
{
outl(0x80000000|(bus&0xff)<<16|(dev&0x1f)<<11|(func&7)<<8|(reg&0xfc),
0xcf8);
outw(data, 0xcfc + (reg & 2));
outl(0, 0xcf8);
}
int main (int argc, char * const argv[])
{
unsigned char *eth_addr;
uchar buf[6];
int instance;
app_startup(argv);
if (argc != 2) {
printf ("call with base Ethernet address\n");
return 1;
}
eth_addr = gethwaddr(argv[1], buf);
if (NULL == eth_addr) {
printf ("Can not parse ethernet address\n");
return 1;
}
if (eth_addr[5] & 0x01) {
printf("Base Ethernet address must be even\n");
}
for (instance = 0; instance < 2; instance ++) {
unsigned int io_addr;
unsigned char mac[6];
int bar1 = read_config_dword(0, 6+instance, 0, 0x14);
if (! (bar1 & 1)) {
printf("ETH%d is disabled %x\n", instance, bar1);
} else {
printf("ETH%d IO=0x%04x\n", instance, bar1 & ~3);
}
io_addr = (bar1 & (~3L));
write_config_word(0, 6+instance, 0, 4,
read_config_word(0, 6+instance, 0, 4) | 1);
printf("ETH%d CMD %04x\n", instance,
read_config_word(0, 6+instance, 0, 4));
memcpy(mac, eth_addr, 6);
mac[5] += instance;
printf("got io=%04x, ha=%02x:%02x:%02x:%02x:%02x:%02x\n",
io_addr, mac[0], mac[1], mac[2],
mac[3], mac[4], mac[5]);
reset_eeprom(io_addr, mac);
}
return 0;
}
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