Add fuse API and commands
This can be useful for fuse-like hardware, OTP SoC options, etc.
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
diff --git a/common/Makefile b/common/Makefile
index 0e0fff1..1cfb132 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -111,6 +111,7 @@
COBJS-$(CONFIG_CMD_FPGA) += cmd_fpga.o
endif
COBJS-$(CONFIG_CMD_FS_GENERIC) += cmd_fs.o
+COBJS-$(CONFIG_CMD_FUSE) += cmd_fuse.o
COBJS-$(CONFIG_CMD_GETTIME) += cmd_gettime.o
COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o
COBJS-$(CONFIG_CMD_I2C) += cmd_i2c.o
diff --git a/common/cmd_fuse.c b/common/cmd_fuse.c
new file mode 100644
index 0000000..f24c01c
--- /dev/null
+++ b/common/cmd_fuse.c
@@ -0,0 +1,168 @@
+/*
+ * (C) Copyright 2009-2013 ADVANSEE
+ * Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
+ *
+ * Based on the mpc512x iim code:
+ * Copyright 2008 Silicon Turnkey Express, Inc.
+ * Martha Marx <mmarx@silicontkx.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <command.h>
+#include <fuse.h>
+#include <asm/errno.h>
+
+static int strtou32(const char *str, unsigned int base, u32 *result)
+{
+ char *ep;
+
+ *result = simple_strtoul(str, &ep, base);
+ if (ep == str || *ep != '\0')
+ return -EINVAL;
+
+ return 0;
+}
+
+static int confirm_prog(void)
+{
+ puts("Warning: Programming fuses is an irreversible operation!\n"
+ " This may brick your system.\n"
+ " Use this command only if you are sure of "
+ "what you are doing!\n"
+ "\nReally perform this fuse programming? <y/N>\n");
+
+ if (getc() == 'y') {
+ int c;
+
+ putc('y');
+ c = getc();
+ putc('\n');
+ if (c == '\r')
+ return 1;
+ }
+
+ puts("Fuse programming aborted\n");
+ return 0;
+}
+
+static int do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+ const char *op = argc >= 2 ? argv[1] : NULL;
+ int confirmed = argc >= 3 && !strcmp(argv[2], "-y");
+ u32 bank, word, cnt, val;
+ int ret, i;
+
+ argc -= 2 + confirmed;
+ argv += 2 + confirmed;
+
+ if (argc < 2 || strtou32(argv[0], 0, &bank) ||
+ strtou32(argv[1], 0, &word))
+ return CMD_RET_USAGE;
+
+ if (!strcmp(op, "read")) {
+ if (argc == 2)
+ cnt = 1;
+ else if (argc != 3 || strtou32(argv[2], 0, &cnt))
+ return CMD_RET_USAGE;
+
+ printf("Reading bank %u:\n", bank);
+ for (i = 0; i < cnt; i++, word++) {
+ if (!(i % 4))
+ printf("\nWord 0x%.8x:", word);
+
+ ret = fuse_read(bank, word, &val);
+ if (ret)
+ goto err;
+
+ printf(" %.8x", val);
+ }
+ putc('\n');
+ } else if (!strcmp(op, "sense")) {
+ if (argc == 2)
+ cnt = 1;
+ else if (argc != 3 || strtou32(argv[2], 0, &cnt))
+ return CMD_RET_USAGE;
+
+ printf("Sensing bank %u:\n", bank);
+ for (i = 0; i < cnt; i++, word++) {
+ if (!(i % 4))
+ printf("\nWord 0x%.8x:", word);
+
+ ret = fuse_sense(bank, word, &val);
+ if (ret)
+ goto err;
+
+ printf(" %.8x", val);
+ }
+ putc('\n');
+ } else if (!strcmp(op, "prog")) {
+ if (argc < 3)
+ return CMD_RET_USAGE;
+
+ for (i = 2; i < argc; i++, word++) {
+ if (strtou32(argv[i], 16, &val))
+ return CMD_RET_USAGE;
+
+ printf("Programming bank %u word 0x%.8x to 0x%.8x...\n",
+ bank, word, val);
+ if (!confirmed && !confirm_prog())
+ return CMD_RET_FAILURE;
+ ret = fuse_prog(bank, word, val);
+ if (ret)
+ goto err;
+ }
+ } else if (!strcmp(op, "override")) {
+ if (argc < 3)
+ return CMD_RET_USAGE;
+
+ for (i = 2; i < argc; i++, word++) {
+ if (strtou32(argv[i], 16, &val))
+ return CMD_RET_USAGE;
+
+ printf("Overriding bank %u word 0x%.8x with "
+ "0x%.8x...\n", bank, word, val);
+ ret = fuse_override(bank, word, val);
+ if (ret)
+ goto err;
+ }
+ } else {
+ return CMD_RET_USAGE;
+ }
+
+ return 0;
+
+err:
+ puts("ERROR\n");
+ return ret;
+}
+
+U_BOOT_CMD(
+ fuse, CONFIG_SYS_MAXARGS, 0, do_fuse,
+ "Fuse sub-system",
+ "read <bank> <word> [<cnt>] - read 1 or 'cnt' fuse words,\n"
+ " starting at 'word'\n"
+ "fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,\n"
+ " starting at 'word'\n"
+ "fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or\n"
+ " several fuse words, starting at 'word' (PERMANENT)\n"
+ "fuse override <bank> <word> <hexval> [<hexval>...] - override 1 or\n"
+ " several fuse words, starting at 'word'"
+);