[PATCH 1/2] cmd: add fuse_blow/fuse_sense for the i.MX IIM fusebox
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Tue Aug 10 03:09:09 EDT 2010
Hi,
sorry I do not really see what the comman do so maybe a small doc or
more comment will be nice
Best Regards,
J.
On 09:25 Tue 10 Aug , Baruch Siach wrote:
> This has only been tested on i.MX25, but should work on other i.MX chips with
> IIM.
>
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> ---
> commands/Kconfig | 5 ++
> commands/Makefile | 1 +
> commands/fuse.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 167 insertions(+), 0 deletions(-)
> create mode 100644 commands/fuse.c
>
> diff --git a/commands/Kconfig b/commands/Kconfig
> index 9d11a8b..eb3e48e 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -173,6 +173,11 @@ config CMD_MTEST_ALTERNATIVE
> depends on CMD_MTEST
> prompt "alternative mtest implementation"
>
> +config CMD_FUSE_BLOW
> + tristate
> + depends on ARCH_IMX25 || ARCH_IMX35
> + prompt "fuse_blow"
> +
> endmenu
>
> menu "flash "
> diff --git a/commands/Makefile b/commands/Makefile
> index 276af85..aa1c12e 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_CMD_ECHO) += echo.o
> obj-$(CONFIG_CMD_MEMORY) += mem.o
> obj-$(CONFIG_CMD_LOADS) += s_record.o
> obj-$(CONFIG_CMD_MTEST) += memtest.o
> +obj-$(CONFIG_CMD_FUSE_BLOW) += fuse.o
> obj-$(CONFIG_CMD_EDIT) += edit.o
> obj-$(CONFIG_CMD_EXEC) += exec.o
> obj-$(CONFIG_CMD_SLEEP) += sleep.o
> diff --git a/commands/fuse.c b/commands/fuse.c
> new file mode 100644
> index 0000000..1c0ccd6
> --- /dev/null
> +++ b/commands/fuse.c
> @@ -0,0 +1,161 @@
> +/*
> + * fuse.c - i.MX IIM fusebox programing and sensing
> + *
> + * Copyright (c) 2010 Baruch Siach <baruch at tkos.co.il>,
> + * Orex Computed Radiography
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <asm/io.h>
> +#include <mach/imx-regs.h>
> +#include <mach/iim.h>
> +
> +static int do_fuse_blow(struct command *cmdtp, int argc, char *argv[])
> +{
> + unsigned int bank, row, value;
> + int bit, ret = 0;
> + u8 err, stat;
> +
> + if (argc != 4)
> + return COMMAND_ERROR_USAGE;
> +
> + bank = simple_strtoul(argv[1], NULL, 0);
> + row = simple_strtoul(argv[2], NULL, 0);
> + value = simple_strtoul(argv[3], NULL, 0);
> +
> + if (bank > 7) {
> + printf("fuse_blow: invalid bank number\n");
> + return 1;
> + }
> +
> + if (row > 0x3ff) {
> + printf("fuse_blow: invalid row offset\n");
> + return 1;
> + }
> +
> + if (value > 0xff) {
> + printf("fuse_blow: invalid value\n");
> + return 1;
> + }
> +
> + /* clear status and error registers */
> + writeb(3, IMX_IIM_BASE + IIM_STATM);
> + writeb(0xfe, IMX_IIM_BASE + IIM_ERR);
> +
> + /* unprotect fuse programing */
> + writeb(0xaa, IMX_IIM_BASE + IIM_PREG_P);
> +
> + /* upper half address register */
> + writeb((bank << 3) | (row >> 7), IMX_IIM_BASE + IIM_UA);
> +
> + for (bit = 0; bit < 8; bit++) {
> + if (((value >> bit) & 1) == 0)
> + continue;
> +
> + /* lower half address register */
> + writeb(((row << 1) | bit), IMX_IIM_BASE + IIM_LA);
> +
> + /* start fuse programing */
> + writeb(0x71, IMX_IIM_BASE + IIM_FCTL);
> +
> + /* wait for program done */
> + while ((readb(IMX_IIM_BASE + IIM_STAT) & 0x80) != 0)
> + ;
> +
> + /* clear program done status */
> + stat = readb(IMX_IIM_BASE + IIM_STAT);
> + writeb(stat, IMX_IIM_BASE + IIM_STAT);
> +
> + err = readb(IMX_IIM_BASE + IIM_ERR);
> + if (err) {
> + printf("fuse_blow: bit %d program error (0x%02x)\n",
> + bit, err);
> + ret = 1;
> + goto out;
> + }
> + }
> +
> +out:
> + /* protect fuse programing */
> + writeb(0, IMX_IIM_BASE + IIM_PREG_P);
> + return ret;
> +}
> +
> +static const __maybe_unused char cmd_fuse_blow_help[] =
> +"Usage: fuse_blow <bank> <row> <value>\n"
> +"Blow fuses in <bank> <row> to match <value>\n";
> +
> +BAREBOX_CMD_START(fuse_blow)
> + .cmd = do_fuse_blow,
> + .usage = "program fuse row",
> + BAREBOX_CMD_HELP(cmd_fuse_blow_help)
> +BAREBOX_CMD_END
> +
> +static int do_fuse_sense(struct command *cmdtp, int argc, char *argv[])
> +{
> + unsigned int bank, row;
> + u8 err, stat;
> +
> + if (argc != 3)
> + return COMMAND_ERROR_USAGE;
> +
> + bank = simple_strtoul(argv[1], NULL, 0);
> + row = simple_strtoul(argv[2], NULL, 0);
> +
> + if (bank > 7) {
> + printf("fuse_sense: invalid bank number\n");
> + return 1;
> + }
> +
> + if (row > 0x3ff) {
> + printf("fuse_sense: invalid row offset\n");
> + return 1;
> + }
> +
> + /* clear status and error registers */
> + writeb(3, IMX_IIM_BASE + IIM_STATM);
> + writeb(0xfe, IMX_IIM_BASE + IIM_ERR);
> +
> + /* upper and lower address halves */
> + writeb((bank << 3) | (row >> 7), IMX_IIM_BASE + IIM_UA);
> + writeb((row << 1) & 0xf8, IMX_IIM_BASE + IIM_LA);
> +
> + /* start fuse sensing */
> + writeb(0x08, IMX_IIM_BASE + IIM_FCTL);
> +
> + /* wait for sense done */
> + while ((readb(IMX_IIM_BASE + IIM_STAT) & 0x80) != 0)
> + ;
> +
> + stat = readb(IMX_IIM_BASE + IIM_STAT);
> + writeb(stat, IMX_IIM_BASE + IIM_STAT);
> +
> + err = readb(IMX_IIM_BASE + IIM_ERR);
> + if (err) {
> + printf("fuse_sense: sense error (0x%02x)\n", err);
> + return 1;
> + }
> +
> + printf("bank %u row 0x%02x: 0x%02x\n", bank, row,
> + readb(IMX_IIM_BASE + IIM_SDAT));
> +
> + return 0;
> +}
> +
> +static const __maybe_unused char cmd_fuse_sense_help[] =
> +"Usage: fuse_sense <bank> <row>\n"
> +"Sense the fuses row at <bank> <row>\n";
> +
> +BAREBOX_CMD_START(fuse_sense)
> + .cmd = do_fuse_sense,
> + .usage = "sense fuse row",
> + BAREBOX_CMD_HELP(cmd_fuse_sense_help)
> +BAREBOX_CMD_END
> --
> 1.7.1
>
>
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