[U-Boot] [PATCH V3 1/3] imx-common/cmd_resetmode.c: add imx resetmode command

[Stefano Babic]

On 09/08/2012 03:26, Troy Kisky wrote:
> This is useful for forcing the ROM's
> usb downloader to activate upon a watchdog reset.
> Or, you can boot from either SD Card.
> 

Hi Troy,

> Currently, support added for MX53 and MX6Q
> Signed-off-by: Troy Kisky <troy.kisky at boundarydevices.com>
> 
> Note: MX53 support untested.

It can help me to understand your implementation if I can find in the
documentation where this feature is implemented. I started wit MX53 and
well, in the manual I see only that LPGR is a "general purpose register"
and contains "user specific data".

Maybe I am searching in wrong places. Where can I find the description
for the feature you have implemented ?

> diff --git a/arch/arm/cpu/armv7/imx-common/Makefile b/arch/arm/cpu/armv7/imx-common/Makefile
> index bf36be5..24f490e 100644
> --- a/arch/arm/cpu/armv7/imx-common/Makefile
> +++ b/arch/arm/cpu/armv7/imx-common/Makefile
> @@ -29,6 +29,7 @@ LIB     = $(obj)libimx-common.o
>  
>  COBJS-y	= iomux-v3.o timer.o cpu.o speed.o
>  COBJS-$(CONFIG_I2C_MXC) += i2c.o
> +COBJS-$(CONFIG_CMD_RESETMODE) += cmd_resetmode.o
>  COBJS	:= $(sort $(COBJS-y))
>  
>  SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
> diff --git a/arch/arm/cpu/armv7/imx-common/cmd_resetmode.c b/arch/arm/cpu/armv7/imx-common/cmd_resetmode.c
> new file mode 100644
> index 0000000..d1c50e1
> --- /dev/null
> +++ b/arch/arm/cpu/armv7/imx-common/cmd_resetmode.c
> @@ -0,0 +1,152 @@
> +/*
> + * Copyright (C) 2012 Boundary Devices Inc.
> + *
> + * 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 <asm/errno.h>
> +#include <asm/io.h>
> +#include <asm/imx-common/resetmode.h>
> +#include <malloc.h>
> +
> +const struct reset_mode *modes[2];
> +
> +const struct reset_mode *search_modes(char *arg)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(modes); i++) {
> +		const struct reset_mode *p = modes[i];
> +		if (p) {
> +			while (p->name) {
> +				if (!strcmp(p->name, arg))
> +					return p;
> +				p++;
> +			}
> +		}
> +	}
> +	return NULL;
> +}
> +
> +int create_usage(char *dest)
> +{
> +	int i;
> +	int size = 0;
> +
> +	for (i = 0; i < ARRAY_SIZE(modes); i++) {
> +		const struct reset_mode *p = modes[i];
> +		if (p) {
> +			while (p->name) {
> +				int len = strlen(p->name);
> +				if (dest) {
> +					memcpy(dest, p->name, len);
> +					dest += len;
> +					*dest++ = '|';
> +				}
> +				size += len + 1;
> +				p++;
> +			}
> +		}
> +	}
> +	if (dest)
> +		dest[-1] = 0;
> +	return size;
> +}
> +
> +int do_resetmode(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> +{
> +	const struct reset_mode *p;
> +
> +	if (argc < 2)
> +		return CMD_RET_USAGE;
> +	p = search_modes(argv[1]);
> +	if (!p)
> +		return CMD_RET_USAGE;
> +	reset_mode_apply(p->cfg_val);
> +	return 0;
> +}
> +
> +U_BOOT_CMD(
> +	resetmode, 2, 0, do_resetmode,
> +	NULL,
> +	"");
> +
> +void add_board_resetmodes(const struct reset_mode *p)
> +{
> +	int size;
> +	char *dest;
> +
> +	if (__u_boot_cmd_resetmode.usage) {
> +		free(__u_boot_cmd_resetmode.usage);
> +		__u_boot_cmd_resetmode.usage = NULL;
> +	}
> +
> +	modes[0] = p;
> +	modes[1] = soc_reset_modes;
> +	size = create_usage(NULL);
> +	dest = malloc(size);
> +	if (dest) {
> +		create_usage(dest);
> +		__u_boot_cmd_resetmode.usage = dest;
> +	}
> +}
> +
> +int do_resetmode_cmd(char *arg)
> +{
> +	const struct reset_mode *p;
> +
> +	p = search_modes(arg);
> +	if (!p) {
> +		printf("%s not found\n", arg);
> +		return CMD_RET_FAILURE;
> +	}
> +	reset_mode_apply(p->cfg_val);
> +	do_reset(NULL, 0, 0, NULL);
> +	return 0;
> +}
> +
> +int do_bootmmc0(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> +{
> +	return do_resetmode_cmd("mmc0");
> +}
> +
> +int do_bootmmc1(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> +{
> +	return do_resetmode_cmd("mmc1");
> +}

Why do you not pass the mode to do_resetmode_cmd() and let this function
parse the argument, without these help functions ? Then we do not need
to add new functions if we have, for example, mmc2 or mmc3.

Best regards,
Stefano Babic

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