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interface to Blackfin on-chip One-Time-Programmable memory
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger
parent
4c727c77e4
commit
d0b01a246d
2 changed files with 164 additions and 0 deletions
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@ -76,6 +76,7 @@ COBJS-y += cmd_nand.o
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COBJS-$(CONFIG_CMD_NET) += cmd_net.o
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COBJS-y += cmd_nvedit.o
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COBJS-y += cmd_onenand.o
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COBJS-$(CONFIG_CMD_OTP) += cmd_otp.o
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ifdef CONFIG_PCI
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COBJS-$(CONFIG_CMD_PCI) += cmd_pci.o
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endif
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163
common/cmd_otp.c
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163
common/cmd_otp.c
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@ -0,0 +1,163 @@
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/*
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* cmd_otp.c - interface to Blackfin on-chip One-Time-Programmable memory
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*
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* Copyright (c) 2007-2008 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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/* There are 512 128-bit "pages" (0x000 to 0x1FF).
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* The pages are accessable as 64-bit "halfpages" (an upper and lower half).
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* The pages are not part of the memory map. There is an OTP controller which
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* handles scanning in/out of bits. While access is done through OTP MMRs,
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* the bootrom provides C-callable helper functions to handle the interaction.
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*/
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#include <config.h>
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#include <common.h>
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#include <command.h>
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#ifdef CONFIG_CMD_OTP
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#include <asm/blackfin.h>
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#include <asm/mach-common/bits/otp.h>
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static const char *otp_strerror(uint32_t err)
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{
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switch (err) {
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case 0: return "no error";
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case OTP_WRITE_ERROR: return "OTP fuse write error";
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case OTP_READ_ERROR: return "OTP fuse read error";
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case OTP_ACC_VIO_ERROR: return "invalid OTP address";
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case OTP_DATA_MULT_ERROR: return "multiple bad bits detected";
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case OTP_ECC_MULT_ERROR: return "error in ECC bits";
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case OTP_PREV_WR_ERROR: return "space already written";
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case OTP_DATA_SB_WARN: return "single bad bit in half page";
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case OTP_ECC_SB_WARN: return "single bad bit in ECC";
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default: return "unknown error";
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}
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}
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#define lowup(x) ((x) % 2 ? "upper" : "lower")
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int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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bool force = false;
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if (!strcmp(argv[1], "--force")) {
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force = true;
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argv[1] = argv[0];
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argv++;
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--argc;
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}
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uint32_t (*otp_func)(uint32_t page, uint32_t flags, uint64_t *page_content);
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if (!strcmp(argv[1], "read"))
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otp_func = otp_read;
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else if (!strcmp(argv[1], "write"))
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otp_func = otp_write;
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else {
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usage:
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printf("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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uint64_t *addr = (uint64_t *)simple_strtoul(argv[2], NULL, 16);
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uint32_t page = simple_strtoul(argv[3], NULL, 16);
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uint32_t flags, ret;
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size_t i, count;
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ulong half;
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if (argc > 4)
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count = simple_strtoul(argv[4], NULL, 16);
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else
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count = 2;
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if (argc > 5) {
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half = simple_strtoul(argv[5], NULL, 16);
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if (half != 0 && half != 1) {
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puts("Error: 'half' can only be '0' or '1'\n");
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goto usage;
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}
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} else
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half = 0;
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/* do to the nature of OTP, make sure users are sure */
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if (!force && otp_func == otp_write) {
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printf(
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"Writing one time programmable memory\n"
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"Make sure your operating voltages and temperature are within spec\n"
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" source address: 0x%p\n"
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" OTP destination: %s page 0x%03X - %s page 0x%03X\n"
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" number to write: %ld halfpages\n"
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" type \"YES\" (no quotes) to confirm: ",
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addr,
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lowup(half), page,
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lowup(half + count - 1), page + (half + count - 1) / 2,
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half + count
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);
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i = 0;
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while (1) {
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if (tstc()) {
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const char exp_ans[] = "YES\r";
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char c;
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putc(c = getc());
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if (exp_ans[i++] != c) {
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printf(" Aborting\n");
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return 1;
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} else if (!exp_ans[i]) {
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puts("\n");
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break;
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}
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}
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}
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/* Only supported in newer silicon ... enable writing */
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#if (0)
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otp_command(OTP_INIT, ...);
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#else
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*pOTP_TIMING = 0x32149485;
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#endif
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}
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printf("OTP memory %s: addr 0x%08lx page 0x%03X count %ld ... ",
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argv[1], addr, page, count);
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ret = 0;
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for (i = half; i < count + half; ++i) {
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flags = (i % 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF;
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ret = otp_func(page, flags, addr);
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if (ret & 0x1)
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break;
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else if (ret)
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puts("W");
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else
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puts(".");
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++addr;
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if (i % 2)
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++page;
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}
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if (ret & 0x1)
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printf("\nERROR at page 0x%03X (%s-halfpage): 0x%03X: %s\n",
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page, lowup(i), ret, otp_strerror(ret));
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else
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puts(" done\n");
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if (otp_func == otp_write)
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/* Only supported in newer silicon ... disable writing */
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#if (0)
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otp_command(OTP_INIT, ...);
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#else
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*pOTP_TIMING = 0x1485;
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#endif
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return ret;
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}
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U_BOOT_CMD(otp, 6, 0, do_otp,
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"otp - One-Time-Programmable sub-system\n",
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"read <addr> <page> [count] [half]\n"
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"otp write [--force] <addr> <page> [count] [half]\n"
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" - read/write 'count' half-pages starting at page 'page' (offset 'half')\n");
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#endif
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