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-rw-r--r--common/cmd_otp.c163
1 files changed, 118 insertions, 45 deletions
diff --git a/common/cmd_otp.c b/common/cmd_otp.c
index e27bb29..6523290 100644
--- a/common/cmd_otp.c
+++ b/common/cmd_otp.c
@@ -6,7 +6,7 @@
* Licensed under the GPL-2 or later.
*/
-/* There are 512 128-bit "pages" (0x000 to 0x1FF).
+/* 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,
@@ -17,8 +17,6 @@
#include <common.h>
#include <command.h>
-#ifdef CONFIG_CMD_OTP
-
#include <asm/blackfin.h>
#include <asm/mach-common/bits/otp.h>
@@ -40,30 +38,87 @@ static const char *otp_strerror(uint32_t err)
#define lowup(x) ((x) % 2 ? "upper" : "lower")
-int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+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)
{
- bool force = false;
- if (!strcmp(argv[1], "--force")) {
- force = true;
- argv[1] = argv[0];
- argv++;
- --argc;
+ 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 *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 (!strcmp(argv[1], "read"))
- otp_func = otp_read;
- else if (!strcmp(argv[1], "write"))
- otp_func = otp_write;
- else {
+
+ if (argc < 4) {
usage:
cmd_usage(cmdtp);
return 1;
}
+ 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, ret;
+ uint32_t flags;
size_t i, count;
ulong half;
@@ -81,14 +136,21 @@ int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
} 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 (!force && otp_func == otp_write) {
+ 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%03X\n"
- " number to write: %ld halfpages\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,
@@ -111,30 +173,42 @@ int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
}
}
}
-
- /* 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 ... ",
+ 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 = (i % 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF;
+ flags = base_flags | (i % 2 ? OTP_UPPER_HALF : OTP_LOWER_HALF);
+ try_again:
ret = otp_func(page, flags, addr);
- if (ret & 0x1)
- break;
- else if (ret)
+ 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(".");
- ++addr;
- if (i % 2)
+ if (!(base_flags & OTP_LOCK)) {
+ ++addr;
+ if (i % 2)
+ ++page;
+ } else
++page;
}
if (ret & 0x1)
@@ -143,21 +217,20 @@ int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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
+ /* Make sure we disable writing */
+ set_otp_timing(false);
+ bfrom_OtpCommand(OTP_CLOSE, 0);
return ret;
}
-U_BOOT_CMD(otp, 6, 0, do_otp,
- "One-Time-Programmable sub-system",
+U_BOOT_CMD(otp, 7, 0, do_otp,
+ "One-Time-Programmable sub-system\n",
"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"
- " - read/write 'count' half-pages starting at page 'page' (offset 'half')\n");
-
-#endif
+ " - write 'count' half-pages starting at 'page' (offset 'half') from 'addr'\n"
+ "otp lock <page> <count>\n"
+ " - lock 'count' pages starting at 'page'\n");
generated by cgit v1.1 at 2024-12-03 08:21:25 +0000