[U-Boot] [PATCH 3/5] Add fuse API and commands

["Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>]

This can be useful for fuse-like hardware, OTP SoC options, etc.

Signed-off-by: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
---
 {u-boot-4d3c95f.orig => u-boot-4d3c95f}/README     |    1 +
 .../common/Makefile                                |    1 +
 /dev/null => u-boot-4d3c95f/common/cmd_fuse.c      |  182 ++++++++++++++++++++
 .../include/config_cmd_all.h                       |    1 +
 /dev/null => u-boot-4d3c95f/include/fuse.h         |   49 ++++++
 5 files changed, 234 insertions(+)
 create mode 100644 u-boot-4d3c95f/common/cmd_fuse.c
 create mode 100644 u-boot-4d3c95f/include/fuse.h

diff --git u-boot-4d3c95f.orig/README u-boot-4d3c95f/README
index fb9d904..c40fd34 100644
--- u-boot-4d3c95f.orig/README
+++ u-boot-4d3c95f/README
@@ -780,6 +780,7 @@ The following options need to be configured:
 		CONFIG_CMD_FDOS		* Dos diskette Support
 		CONFIG_CMD_FLASH	  flinfo, erase, protect
 		CONFIG_CMD_FPGA		  FPGA device initialization support
+		CONFIG_CMD_FUSE		  Device fuse support
 		CONFIG_CMD_GO		* the 'go' command (exec code)
 		CONFIG_CMD_GREPENV	* search environment
 		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
diff --git u-boot-4d3c95f.orig/common/Makefile u-boot-4d3c95f/common/Makefile
index 3d62775..44ef757 100644
--- u-boot-4d3c95f.orig/common/Makefile
+++ u-boot-4d3c95f/common/Makefile
@@ -96,6 +96,7 @@ COBJS-$(CONFIG_CMD_FLASH) += cmd_flash.o
 ifdef CONFIG_FPGA
 COBJS-$(CONFIG_CMD_FPGA) += cmd_fpga.o
 endif
+COBJS-$(CONFIG_CMD_FUSE) += cmd_fuse.o
 COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o
 COBJS-$(CONFIG_CMD_I2C) += cmd_i2c.o
 COBJS-$(CONFIG_CMD_IDE) += cmd_ide.o
diff --git u-boot-4d3c95f/common/cmd_fuse.c u-boot-4d3c95f/common/cmd_fuse.c
new file mode 100644
index 0000000..fd54d40
--- /dev/null
+++ u-boot-4d3c95f/common/cmd_fuse.c
@@ -0,0 +1,182 @@
+/*
+ * (C) Copyright 2009-2012 ADVANSEE
+ * Beno?t Th?baudeau <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 do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	u32 bank, row, bit, cnt, val;
+	int ret, i;
+
+	if (argc < 4 || strtou32(argv[2], 0, &bank) ||
+			strtou32(argv[3], 0, &row))
+		return CMD_RET_USAGE;
+
+	if (!strcmp(argv[1], "read.bit")) {
+		if (argc != 5 || strtou32(argv[4], 0, &bit))
+			return CMD_RET_USAGE;
+
+		printf("Reading bank %u row 0x%.8x bit %u: ", bank, row, bit);
+		ret = fuse_read_bit(bank, row, bit, &val);
+		if (ret)
+			goto err;
+
+		printf("%u\n", val);
+	} else if (!strcmp(argv[1], "read.row")) {
+		if (argc == 4)
+			cnt = 1;
+		else if (argc != 5 || strtou32(argv[4], 0, &cnt))
+			return CMD_RET_USAGE;
+
+		printf("Reading bank %u:\n", bank);
+		for (i = 0; i < cnt; i++, row++) {
+			if (!(i % 4))
+				printf("\nRow 0x%.8x:", row);
+
+			ret = fuse_read_row(bank, row, &val);
+			if (ret)
+				goto err;
+
+			printf(" %.8x", val);
+		}
+		putc('\n');
+	} else if (!strcmp(argv[1], "sense.bit")) {
+		if (argc != 5 || strtou32(argv[4], 0, &bit))
+			return CMD_RET_USAGE;
+
+		printf("Sensing bank %u row 0x%.8x bit %u: ", bank, row, bit);
+		ret = fuse_sense_bit(bank, row, bit, &val);
+		if (ret)
+			goto err;
+
+		printf("%u\n", val);
+	} else if (!strcmp(argv[1], "sense.row")) {
+		if (argc == 4)
+			cnt = 1;
+		else if (argc != 5 || strtou32(argv[4], 0, &cnt))
+			return CMD_RET_USAGE;
+
+		printf("Sensing bank %u:\n", bank);
+		for (i = 0; i < cnt; i++, row++) {
+			if (!(i % 4))
+				printf("\nRow 0x%.8x:", row);
+
+			ret = fuse_sense_row(bank, row, &val);
+			if (ret)
+				goto err;
+
+			printf(" %.8x", val);
+		}
+		putc('\n');
+	} else if (!strcmp(argv[1], "prog.bit")) {
+		if (argc != 5 || strtou32(argv[4], 0, &bit))
+			return CMD_RET_USAGE;
+
+		printf("Programming bank %u row 0x%.8x bit %u...\n",
+				bank, row, bit);
+		ret = fuse_prog_bit(bank, row, bit);
+		if (ret)
+			goto err;
+	} else if (!strcmp(argv[1], "prog.row")) {
+		if (argc < 5)
+			return CMD_RET_USAGE;
+
+		for (i = 4; i < argc; i++, row++) {
+			if (strtou32(argv[i], 16, &val))
+				return CMD_RET_USAGE;
+
+			printf("Programming bank %u row 0x%.8x to 0x%.8x...\n",
+					bank, row, val);
+			ret = fuse_prog_row(bank, row, val);
+			if (ret)
+				goto err;
+		}
+	} else if (!strcmp(argv[1], "ovride.bit")) {
+		if (argc != 6 || strtou32(argv[4], 0, &bit) ||
+				strtou32(argv[5], 0, &val) || val > 1)
+			return CMD_RET_USAGE;
+
+		printf("Overriding bank %u row 0x%.8x bit %u with %u...\n",
+				bank, row, bit, val);
+		ret = fuse_override_bit(bank, row, bit, val);
+		if (ret)
+			goto err;
+	} else if (!strcmp(argv[1], "ovride.row")) {
+		if (argc < 5)
+			return CMD_RET_USAGE;
+
+		for (i = 4; i < argc; i++, row++) {
+			if (strtou32(argv[i], 16, &val))
+				return CMD_RET_USAGE;
+
+			printf("Overriding bank %u row 0x%.8x with 0x%.8x...\n",
+					bank, row, val);
+			ret = fuse_override_row(bank, row, 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.bit <bank> <row> <bit> - read a fuse bit\n"
+	"fuse read.row <bank> <row> [<cnt>] - read 1 or 'cnt' fuse rows,\n"
+	"    starting at 'row'\n"
+	"fuse sense.bit <bank> <row> <bit> - sense a fuse bit\n"
+	"fuse sense.row <bank> <row> [<cnt>] - sense 1 or 'cnt' fuse rows,\n"
+	"    starting at 'row'\n"
+	"fuse prog.bit <bank> <row> <bit> - program a fuse bit (PERMANENT)\n"
+	"fuse prog.row <bank> <row> <hexval> [<hexval>...] - program 1 or\n"
+	"    several fuse rows, starting at 'row' (PERMANENT)\n"
+	"fuse ovride.bit <bank> <row> <bit> <val> - override a fuse bit\n"
+	"fuse ovride.row <bank> <row> <hexval> [<hexval>...] - override 1 or\n"
+	"    several fuse rows, starting at 'row'"
+);
diff --git u-boot-4d3c95f.orig/include/config_cmd_all.h u-boot-4d3c95f/include/config_cmd_all.h
index f434cd0..8f7d9ae 100644
--- u-boot-4d3c95f.orig/include/config_cmd_all.h
+++ u-boot-4d3c95f/include/config_cmd_all.h
@@ -40,6 +40,7 @@
 #define CONFIG_CMD_FDOS		/* Floppy DOS support		*/
 #define CONFIG_CMD_FLASH	/* flinfo, erase, protect	*/
 #define CONFIG_CMD_FPGA		/* FPGA configuration Support	*/
+#define CONFIG_CMD_FUSE		/* Device fuse support		*/
 #define CONFIG_CMD_HWFLOW	/* RTS/CTS hw flow control	*/
 #define CONFIG_CMD_I2C		/* I2C serial bus support	*/
 #define CONFIG_CMD_IDE		/* IDE harddisk support		*/
diff --git u-boot-4d3c95f/include/fuse.h u-boot-4d3c95f/include/fuse.h
new file mode 100644
index 0000000..baefefe
--- /dev/null
+++ u-boot-4d3c95f/include/fuse.h
@@ -0,0 +1,49 @@
+/*
+ * (C) Copyright 2009-2012 ADVANSEE
+ * Beno?t Th?baudeau <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
+ */
+
+#ifndef _FUSE_H_
+#define _FUSE_H_
+
+/*
+ * Read/Sense/Program/Override interface:
+ *   bank:    Fuse bank
+ *   row:     Fuse row within the bank
+ *   bit:     Fuse bit within the row
+ *   val:     Value to read/write
+ *
+ *   Returns: 0 on success, not 0 on failure
+ */
+int fuse_read_bit(u32 bank, u32 row, u32 bit, u32 *val);
+int fuse_read_row(u32 bank, u32 row, u32 *val);
+int fuse_sense_bit(u32 bank, u32 row, u32 bit, u32 *val);
+int fuse_sense_row(u32 bank, u32 row, u32 *val);
+int fuse_prog_bit(u32 bank, u32 row, u32 bit);
+int fuse_prog_row(u32 bank, u32 row, u32 val);
+int fuse_override_bit(u32 bank, u32 row, u32 bit, u32 val);
+int fuse_override_row(u32 bank, u32 row, u32 val);
+
+#endif	/* _FUSE_H_ */