u-boot/common/cmd_otp.c
Simon Glass 4c12eeb8b5 Convert cmd_usage() calls in common to use a return value
Change all files in common/ to use CMD_RET_USAGE instead of calling
cmd_usage() directly. I'm not completely sure about this patch since
the code since impact is small (100 byte or so on ARM) and it might
need splitting into smaller patches. But for now here it is.

Signed-off-by: Simon Glass <sjg@chromium.org>
2012-03-06 21:09:46 +01:00

239 lines
5.9 KiB
C

/*
* 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 through 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>
#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")
static int check_voltage(void)
{
/* Make sure voltage limits are within datasheet spec */
uint16_t vr_ctl = bfin_read_VR_CTL();
#ifdef __ADSPBF54x__
/* 0.9V <= VDDINT <= 1.1V */
if ((vr_ctl & 0xc) && (vr_ctl & 0xc0) == 0xc0)
return 1;
#else
/* for the parts w/out qualification yet */
(void)vr_ctl;
#endif
return 0;
}
static void set_otp_timing(bool write)
{
static uint32_t timing;
if (!timing) {
uint32_t tp1, tp2, tp3;
/* OTP_TP1 = 1000 / sclk_period (in nanoseconds)
* OTP_TP1 = 1000 / (1 / get_sclk() * 10^9)
* OTP_TP1 = (1000 * get_sclk()) / 10^9
* OTP_TP1 = get_sclk() / 10^6
*/
tp1 = get_sclk() / 1000000;
/* OTP_TP2 = 400 / (2 * sclk_period)
* OTP_TP2 = 400 / (2 * 1 / get_sclk() * 10^9)
* OTP_TP2 = (400 * get_sclk()) / (2 * 10^9)
* OTP_TP2 = (2 * get_sclk()) / 10^7
*/
tp2 = (2 * get_sclk() / 10000000) << 8;
/* OTP_TP3 = magic constant */
tp3 = (0x1401) << 15;
timing = tp1 | tp2 | tp3;
}
bfrom_OtpCommand(OTP_INIT, write ? timing : timing & ~(-1 << 15));
}
int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char *cmd;
uint32_t ret, base_flags;
bool prompt_user, force_read;
uint32_t (*otp_func)(uint32_t page, uint32_t flags, uint64_t *page_content);
if (argc < 4) {
usage:
return CMD_RET_USAGE;
}
prompt_user = false;
base_flags = 0;
cmd = argv[1];
if (!strcmp(cmd, "read"))
otp_func = bfrom_OtpRead;
else if (!strcmp(cmd, "dump")) {
otp_func = bfrom_OtpRead;
force_read = true;
} else if (!strcmp(cmd, "write")) {
otp_func = bfrom_OtpWrite;
base_flags = OTP_CHECK_FOR_PREV_WRITE;
if (!strcmp(argv[2], "--force")) {
argv++;
--argc;
} else
prompt_user = false;
} else if (!strcmp(cmd, "lock")) {
if (argc != 4)
goto usage;
otp_func = bfrom_OtpWrite;
base_flags = OTP_LOCK;
} else
goto usage;
uint64_t *addr = (uint64_t *)simple_strtoul(argv[2], NULL, 16);
uint32_t page = simple_strtoul(argv[3], NULL, 16);
uint32_t flags;
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;
/* "otp lock" has slightly different semantics */
if (base_flags & OTP_LOCK) {
count = page;
page = (uint32_t)addr;
addr = NULL;
}
/* do to the nature of OTP, make sure users are sure */
if (prompt_user) {
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%03lX\n"
" number to write: %lu 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;
}
}
}
}
printf("OTP memory %s: addr 0x%p page 0x%03X count %zu ... ",
cmd, addr, page, count);
set_otp_timing(otp_func == bfrom_OtpWrite);
if (otp_func == bfrom_OtpWrite && check_voltage()) {
puts("ERROR: VDDINT voltage is out of spec for writing\n");
return -1;
}
/* Do the actual reading/writing stuff */
ret = 0;
for (i = half; i < count + half; ++i) {
flags = base_flags | (i % 2 ? OTP_UPPER_HALF : OTP_LOWER_HALF);
try_again:
ret = otp_func(page, flags, addr);
if (ret & OTP_MASTER_ERROR) {
if (force_read) {
if (flags & OTP_NO_ECC)
break;
else
flags |= OTP_NO_ECC;
puts("E");
goto try_again;
} else
break;
} else if (ret)
puts("W");
else
puts(".");
if (!(base_flags & OTP_LOCK)) {
++addr;
if (i % 2)
++page;
} else
++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");
/* Make sure we disable writing */
set_otp_timing(false);
bfrom_OtpCommand(OTP_CLOSE, 0);
return ret;
}
U_BOOT_CMD(
otp, 7, 0, do_otp,
"One-Time-Programmable sub-system",
"read <addr> <page> [count] [half]\n"
" - read 'count' half-pages starting at 'page' (offset 'half') to 'addr'\n"
"otp dump <addr> <page> [count] [half]\n"
" - like 'otp read', but skip read errors\n"
"otp write [--force] <addr> <page> [count] [half]\n"
" - write 'count' half-pages starting at 'page' (offset 'half') from 'addr'\n"
"otp lock <page> <count>\n"
" - lock 'count' pages starting at 'page'"
);