cmd_otp.c
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/*
* cmd_otp.c - interface to Blackfin on-chip One-Time-Programmable memory
*
* Copyright (c) 2007-2008 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
/* There are 512 128-bit "pages" (0x000 to 0x1FF).
* The pages are accessable as 64-bit "halfpages" (an upper and lower half).
* The pages are not part of the memory map. There is an OTP controller which
* handles scanning in/out of bits. While access is done through OTP MMRs,
* the bootrom provides C-callable helper functions to handle the interaction.
*/
#include <config.h>
#include <common.h>
#include <command.h>
#ifdef CONFIG_CMD_OTP
#include <asm/blackfin.h>
#include <asm/mach-common/bits/otp.h>
static const char *otp_strerror(uint32_t err)
{
switch (err) {
case 0: return "no error";
case OTP_WRITE_ERROR: return "OTP fuse write error";
case OTP_READ_ERROR: return "OTP fuse read error";
case OTP_ACC_VIO_ERROR: return "invalid OTP address";
case OTP_DATA_MULT_ERROR: return "multiple bad bits detected";
case OTP_ECC_MULT_ERROR: return "error in ECC bits";
case OTP_PREV_WR_ERROR: return "space already written";
case OTP_DATA_SB_WARN: return "single bad bit in half page";
case OTP_ECC_SB_WARN: return "single bad bit in ECC";
default: return "unknown error";
}
}
#define lowup(x) ((x) % 2 ? "upper" : "lower")
int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
bool force = false;
if (!strcmp(argv[1], "--force")) {
force = true;
argv[1] = argv[0];
argv++;
--argc;
}
uint32_t (*otp_func)(uint32_t page, uint32_t flags, uint64_t *page_content);
if (!strcmp(argv[1], "read"))
otp_func = otp_read;
else if (!strcmp(argv[1], "write"))
otp_func = otp_write;
else {
usage:
printf("Usage:\n%s\n", cmdtp->usage);
return 1;
}
uint64_t *addr = (uint64_t *)simple_strtoul(argv[2], NULL, 16);
uint32_t page = simple_strtoul(argv[3], NULL, 16);
uint32_t flags, ret;
size_t i, count;
ulong half;
if (argc > 4)
count = simple_strtoul(argv[4], NULL, 16);
else
count = 2;
if (argc > 5) {
half = simple_strtoul(argv[5], NULL, 16);
if (half != 0 && half != 1) {
puts("Error: 'half' can only be '0' or '1'\n");
goto usage;
}
} else
half = 0;
/* do to the nature of OTP, make sure users are sure */
if (!force && otp_func == otp_write) {
printf(
"Writing one time programmable memory\n"
"Make sure your operating voltages and temperature are within spec\n"
" source address: 0x%p\n"
" OTP destination: %s page 0x%03X - %s page 0x%03X\n"
" number to write: %ld halfpages\n"
" type \"YES\" (no quotes) to confirm: ",
addr,
lowup(half), page,
lowup(half + count - 1), page + (half + count - 1) / 2,
half + count
);
i = 0;
while (1) {
if (tstc()) {
const char exp_ans[] = "YES\r";
char c;
putc(c = getc());
if (exp_ans[i++] != c) {
printf(" Aborting\n");
return 1;
} else if (!exp_ans[i]) {
puts("\n");
break;
}
}
}
/* Only supported in newer silicon ... enable writing */
#if (0)
otp_command(OTP_INIT, ...);
#else
*pOTP_TIMING = 0x32149485;
#endif
}
printf("OTP memory %s: addr 0x%08lx page 0x%03X count %ld ... ",
argv[1], addr, page, count);
ret = 0;
for (i = half; i < count + half; ++i) {
flags = (i % 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF;
ret = otp_func(page, flags, addr);
if (ret & 0x1)
break;
else if (ret)
puts("W");
else
puts(".");
++addr;
if (i % 2)
++page;
}
if (ret & 0x1)
printf("\nERROR at page 0x%03X (%s-halfpage): 0x%03X: %s\n",
page, lowup(i), ret, otp_strerror(ret));
else
puts(" done\n");
if (otp_func == otp_write)
/* Only supported in newer silicon ... disable writing */
#if (0)
otp_command(OTP_INIT, ...);
#else
*pOTP_TIMING = 0x1485;
#endif
return ret;
}
U_BOOT_CMD(otp, 6, 0, do_otp,
"otp - One-Time-Programmable sub-system\n",
"read <addr> <page> [count] [half]\n"
"otp write [--force] <addr> <page> [count] [half]\n"
" - read/write 'count' half-pages starting at page 'page' (offset 'half')\n");
#endif