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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 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[])
{
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_usage(cmdtp);
}
prompt_user = false;
base_flags = 0;
if (!strcmp(argv[1], "read"))
otp_func = bfrom_OtpRead;
else if (!strcmp(argv[1], "dump")) {
otp_func = bfrom_OtpRead;
force_read = true;
} else if (!strcmp(argv[1], "write")) {
otp_func = bfrom_OtpWrite;
base_flags = OTP_CHECK_FOR_PREV_WRITE;
if (!strcmp(argv[2], "--force")) {
argv[2] = argv[1];
argv++;
--argc;
} else
prompt_user = false;
} else if (!strcmp(argv[1], "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 ... ",
argv[1], 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'"
);
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