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

[Troy Kisky <troy.kisky@boundarydevices.com>]

On 8/9/2012 12:21 AM, Stefano Babic wrote:
> 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@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 ?

The only documentations I've found are in the freescale release of u-boot.
cpu/arm_cortexa8/mx53/generic.c

void do_switch_mfgmode(void)
{
         u32 reg;
         reg = readl(SRTC_BASE_ADDR + SRTC_LPGR);
         /* After set bit 28 of LPGR register of SRTC to 1, Set bit
          * [25:0] to specified value according to format of SBMR,
          * after trigger a watchdog reset, ROM will read Bit 28 and
          * then copy bit [25:0] of LPGR to SBMR, then ROM can enter
          * serial download mode.*/
         reg |= 0x12000000;
         writel(reg, SRTC_BASE_ADDR + SRTC_LPGR);
         /* this watchdog reset will let chip enter mfgtool download
          * mode. */
         do_reset(NULL, 0, 0, NULL);
}

U_BOOT_CMD(
         download_mode, 1, 1, do_switch_mfgmode,
         "download_mode - enter i.MX serial/usb download mode\n",
         "");


and for mx6q by disassembling iMX6DQ_SPI_to_uSDHC3.bin
and iMX6DQ_SPI_to_uSDHC4.bin



>
>> 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.

These functions are requested shortcuts.
"bootmmc0" is the same as "resetmode mmc0 && reset"

>
> Best regards,
> Stefano Babic
>