interface to Blackfin on-chip One-Time-Programmable memory
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/common/Makefile b/common/Makefile
index fbfa536..3cdab37 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -76,6 +76,7 @@
COBJS-$(CONFIG_CMD_NET) += cmd_net.o
COBJS-y += cmd_nvedit.o
COBJS-y += cmd_onenand.o
+COBJS-$(CONFIG_CMD_OTP) += cmd_otp.o
ifdef CONFIG_PCI
COBJS-$(CONFIG_CMD_PCI) += cmd_pci.o
endif
diff --git a/common/cmd_otp.c b/common/cmd_otp.c
new file mode 100644
index 0000000..825fa34
--- /dev/null
+++ b/common/cmd_otp.c
@@ -0,0 +1,163 @@
+/*
+ * 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