board/gateworks/gw_ventana/gsc.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2013 Gateworks Corporation
  *
  * Author: Tim Harvey <tharvey@gateworks.com>
  */

 #include <common.h>
 #include <command.h>
 #include <log.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <common.h>
 #include <i2c.h>
 #include <linux/ctype.h>

 #include <asm/arch/sys_proto.h>
 #include <asm/global_data.h>

 #include "ventana_eeprom.h"
 #include "gsc.h"

 DECLARE_GLOBAL_DATA_PTR;

 /*
  * The Gateworks System Controller will fail to ACK a master transaction if
  * it is busy, which can occur during its 1HZ timer tick while reading ADC's.
  * When this does occur, it will never be busy long enough to fail more than
  * 2 back-to-back transfers.  Thus we wrap i2c_read and i2c_write with
  * 3 retries.
  */
 int gsc_i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
 {
 	int retry = 3;
 	int n = 0;
 	int ret;

 	while (n++ < retry) {
 		ret = i2c_read(chip, addr, alen, buf, len);
 		if (!ret)
 			break;
 		debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
 		      n, ret);
 		if (ret != -EREMOTEIO)
 			break;
 		mdelay(10);
 	}
 	return ret;
 }

 int gsc_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
 {
 	int retry = 3;
 	int n = 0;
 	int ret;

 	while (n++ < retry) {
 		ret = i2c_write(chip, addr, alen, buf, len);
 		if (!ret)
 			break;
 		debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
 		      n, ret);
 		if (ret != -EREMOTEIO)
 			break;
 		mdelay(10);
 	}
 	mdelay(100);
 	return ret;
 }

 int gsc_get_board_temp(void)
 {
 	const void *fdt = gd->fdt_blob;
 	int node, reg, mode, val;
 	const char *label;
 	u8 buf[2];
 	int ret;

 	node = fdt_node_offset_by_compatible(fdt, -1, "gw,gsc-adc");
 	if (node <= 0)
 		return node;
 	i2c_set_bus_num(0);

 	/* iterate over hwmon nodes */
 	node = fdt_first_subnode(fdt, node);
 	while (node > 0) {
 		reg = fdtdec_get_int(fdt, node, "reg", -1);
 		mode = fdtdec_get_int(fdt, node, "gw,mode", -1);
 		label = fdt_stringlist_get(fdt, node, "label", 0, NULL);

 		if ((reg == -1) || (mode == -1) || !label) {
 			printf("invalid dt:%s\n", fdt_get_name(fdt, node, NULL));
 			continue;
 		}

 		if ((mode != 0) || strcmp(label, "temp"))
 			continue;

 		memset(buf, 0, sizeof(buf));
 		ret = gsc_i2c_read(GSC_HWMON_ADDR, reg, 1, buf, sizeof(buf));
 		val = buf[0] | buf[1] << 8;
 		if (val >= 0) {
 			if (val > 0x8000)
 				val -= 0xffff;
 			return val;
 		}
 		node = fdt_next_subnode(fdt, node);
 	}

 	return 0;
 }

 /* display hardware monitor ADC channels */
 int gsc_hwmon(void)
 {
 	const void *fdt = gd->fdt_blob;
 	int node, reg, mode, len, val, offset;
 	const char *label;
 	u8 buf[2];
 	int ret;

 	node = fdt_node_offset_by_compatible(fdt, -1, "gw,gsc-adc");
 	if (node <= 0)
 		return node;
 	i2c_set_bus_num(0);

 	/* iterate over hwmon nodes */
 	node = fdt_first_subnode(fdt, node);
 	while (node > 0) {
 		reg = fdtdec_get_int(fdt, node, "reg", -1);
 		mode = fdtdec_get_int(fdt, node, "gw,mode", -1);
 		offset = fdtdec_get_int(fdt, node, "gw,voltage-offset-microvolt", 0);
 		label = fdt_stringlist_get(fdt, node, "label", 0, NULL);

 		if ((reg == -1) || (mode == -1) || !label)
 			printf("invalid dt:%s\n", fdt_get_name(fdt, node, NULL));

 		memset(buf, 0, sizeof(buf));
 		ret = gsc_i2c_read(GSC_HWMON_ADDR, reg, 1, buf, sizeof(buf));
 		val = buf[0] | buf[1] << 8;
 		if (val >= 0) {
 			const u32 *div;
 			int r[2];

 			switch (mode) {
 			case 0: /* temperature (C*10) */
 				if (val > 0x8000)
 					val -= 0xffff;
 				printf("%-8s: %d.%ldC\n", label, val / 10, abs(val % 10));
 				break;
 			case 1: /* prescaled voltage */
 				if (val != 0xffff)
 					printf("%-8s: %d.%03dV\n", label, val / 1000, val % 1000);
 				break;
 			case 2: /* scaled based on ref volt and resolution */
 				val *= 2500;
 				val /= 1 << 12;

 				/* apply pre-scaler voltage divider */
 				div  = fdt_getprop(fdt, node, "gw,voltage-divider-ohms", &len);
 				if (div && (len == sizeof(uint32_t) * 2)) {
 					r[0] = fdt32_to_cpu(div[0]);
 					r[1] = fdt32_to_cpu(div[1]);
 					if (r[0] && r[1]) {
 						val *= (r[0] + r[1]);
 						val /= r[1];
 					}
 				}

 				/* adjust by offset */
 				val += (offset / 1000);

 				printf("%-8s: %d.%03dV\n", label, val / 1000, val % 1000);
 				break;
 			}
 		}
 		node = fdt_next_subnode(fdt, node);
 	}

 	return 0;
 }

 int gsc_info(int verbose)
 {
 	unsigned char buf[16];

 	i2c_set_bus_num(0);
 	if (gsc_i2c_read(GSC_SC_ADDR, 0, 1, buf, 16))
 		return CMD_RET_FAILURE;

 	printf("GSC:   v%d", buf[GSC_SC_FWVER]);
 	printf(" 0x%04x", buf[GSC_SC_FWCRC] | buf[GSC_SC_FWCRC+1]<<8);
 	printf(" WDT:%sabled", (buf[GSC_SC_CTRL1] & (1<<GSC_SC_CTRL1_WDEN))
 		? "en" : "dis");
 	if (buf[GSC_SC_STATUS] & (1 << GSC_SC_IRQ_WATCHDOG)) {
 		buf[GSC_SC_STATUS] &= ~(1 << GSC_SC_IRQ_WATCHDOG);
 		puts(" WDT_RESET");
 		gsc_i2c_write(GSC_SC_ADDR, GSC_SC_STATUS, 1,
 			      &buf[GSC_SC_STATUS], 1);
 	}
 	printf(" board temp at %dC", gsc_get_board_temp() / 10);
 	puts("\n");
 	if (!verbose)
 		return CMD_RET_SUCCESS;

 	gsc_hwmon();

 	return 0;
 }

 /*
  *  The Gateworks System Controller implements a boot
  *  watchdog (always enabled) as a workaround for IMX6 boot related
  *  errata such as:
  *    ERR005768 - no fix scheduled
  *    ERR006282 - fixed in silicon r1.2
  *    ERR007117 - fixed in silicon r1.3
  *    ERR007220 - fixed in silicon r1.3
  *    ERR007926 - no fix scheduled
  *  see http://cache.freescale.com/files/32bit/doc/errata/IMX6DQCE.pdf
  *
  * Disable the boot watchdog
  */
 int gsc_boot_wd_disable(void)
 {
 	u8 reg;

 	i2c_set_bus_num(CONFIG_I2C_GSC);
 	if (!gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1)) {
 		reg |= (1 << GSC_SC_CTRL1_WDDIS);
 		if (!gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 			return 0;
 	}
 	puts("Error: could not disable GSC Watchdog\n");
 	return 1;
 }

 /* determine BOM revision from model */
 int get_bom_rev(const char *str)
 {
 	int  rev_bom = 0;
 	int i;

 	for (i = strlen(str) - 1; i > 0; i--) {
 		if (str[i] == '-')
 			break;
 		if (str[i] >= '1' && str[i] <= '9') {
 			rev_bom = str[i] - '0';
 			break;
 		}
 	}
 	return rev_bom;
 }

 /* determine PCB revision from model */
 char get_pcb_rev(const char *str)
 {
 	char rev_pcb = 'A';
 	int i;

 	for (i = strlen(str) - 1; i > 0; i--) {
 		if (str[i] == '-')
 			break;
 		if (str[i] >= 'A') {
 			rev_pcb = str[i];
 			break;
 		}
 	}
 	return rev_pcb;
 }

 /*
  * get dt name based on model and detail level:
  */
 const char *gsc_get_dtb_name(int level, char *buf, int sz)
 {
 	const char *model = (const char *)ventana_info.model;
 	const char *pre = is_mx6dq() ? "imx6q-" : "imx6dl-";
 	int modelno, rev_pcb, rev_bom;

 	/* a few board models are dt equivalents to other models */
 	if (strncasecmp(model, "gw5906", 6) == 0)
 		model = "gw552x-d";
 	else if (strncasecmp(model, "gw5908", 6) == 0)
 		model = "gw53xx-f";
 	else if (strncasecmp(model, "gw5905", 6) == 0)
 		model = "gw5904-a";

 	modelno = ((model[2] - '0') * 1000)
 		  + ((model[3] - '0') * 100)
 		  + ((model[4] - '0') * 10)
 		  + (model[5] - '0');
 	rev_pcb = tolower(get_pcb_rev(model));
 	rev_bom = get_bom_rev(model);

 	/* compare model/rev/bom in order of most specific to least */
 	snprintf(buf, sz, "%s%04d", pre, modelno);
 	switch (level) {
 	case 0: /* full model first (ie gw5400-a1) */
 		if (rev_bom) {
 			snprintf(buf, sz, "%sgw%04d-%c%d", pre, modelno, rev_pcb, rev_bom);
 			break;
 		}
 		fallthrough;
 	case 1: /* don't care about bom rev (ie gw5400-a) */
 		snprintf(buf, sz, "%sgw%04d-%c", pre, modelno, rev_pcb);
 		break;
 	case 2: /* don't care about the pcb rev (ie gw5400) */
 		snprintf(buf, sz, "%sgw%04d", pre, modelno);
 		break;
 	case 3: /* look for generic model (ie gw540x) */
 		snprintf(buf, sz, "%sgw%03dx", pre, modelno / 10);
 		break;
 	case 4: /* look for more generic model (ie gw54xx) */
 		snprintf(buf, sz, "%sgw%02dxx", pre, modelno / 100);
 		break;
 	default: /* give up */
 		return NULL;
 	}

 	return buf;
 }

 #if defined(CONFIG_CMD_GSC) && !defined(CONFIG_SPL_BUILD)
 static int do_gsc_sleep(struct cmd_tbl *cmdtp, int flag, int argc,
 			char *const argv[])
 {
 	unsigned char reg;
 	unsigned long secs = 0;

 	if (argc < 2)
 		return CMD_RET_USAGE;

 	secs = dectoul(argv[1], NULL);
 	printf("GSC Sleeping for %ld seconds\n", secs);

 	i2c_set_bus_num(0);
 	reg = (secs >> 24) & 0xff;
 	if (gsc_i2c_write(GSC_SC_ADDR, 9, 1, &reg, 1))
 		goto error;
 	reg = (secs >> 16) & 0xff;
 	if (gsc_i2c_write(GSC_SC_ADDR, 8, 1, &reg, 1))
 		goto error;
 	reg = (secs >> 8) & 0xff;
 	if (gsc_i2c_write(GSC_SC_ADDR, 7, 1, &reg, 1))
 		goto error;
 	reg = secs & 0xff;
 	if (gsc_i2c_write(GSC_SC_ADDR, 6, 1, &reg, 1))
 		goto error;
 	if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 		goto error;
 	reg |= (1 << 2);
 	if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 		goto error;
 	reg &= ~(1 << 2);
 	reg |= 0x3;
 	if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 		goto error;

 	return CMD_RET_SUCCESS;

 error:
 	printf("i2c error\n");
 	return CMD_RET_FAILURE;
 }

 static int do_gsc_wd(struct cmd_tbl *cmdtp, int flag, int argc,
 		     char *const argv[])
 {
 	unsigned char reg;

 	if (argc < 2)
 		return CMD_RET_USAGE;

 	if (strcasecmp(argv[1], "enable") == 0) {
 		int timeout = 0;

 		if (argc > 2)
 			timeout = dectoul(argv[2], NULL);
 		i2c_set_bus_num(0);
 		if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 			return CMD_RET_FAILURE;
 		reg &= ~((1 << GSC_SC_CTRL1_WDEN) | (1 << GSC_SC_CTRL1_WDTIME));
 		if (timeout == 60)
 			reg |= (1 << GSC_SC_CTRL1_WDTIME);
 		else
 			timeout = 30;
 		reg |= (1 << GSC_SC_CTRL1_WDEN);
 		if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 			return CMD_RET_FAILURE;
 		printf("GSC Watchdog enabled with timeout=%d seconds\n",
 		       timeout);
 	} else if (strcasecmp(argv[1], "disable") == 0) {
 		i2c_set_bus_num(0);
 		if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 			return CMD_RET_FAILURE;
 		reg &= ~((1 << GSC_SC_CTRL1_WDEN) | (1 << GSC_SC_CTRL1_WDTIME));
 		if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 			return CMD_RET_FAILURE;
 		printf("GSC Watchdog disabled\n");
 	} else {
 		return CMD_RET_USAGE;
 	}
 	return CMD_RET_SUCCESS;
 }

 static int do_gsc(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	if (argc < 2)
 		return gsc_info(1);

 	if (strcasecmp(argv[1], "wd") == 0)
 		return do_gsc_wd(cmdtp, flag, --argc, ++argv);
 	else if (strcasecmp(argv[1], "sleep") == 0)
 		return do_gsc_sleep(cmdtp, flag, --argc, ++argv);

 	return CMD_RET_USAGE;
 }

 U_BOOT_CMD(
 	gsc, 4, 1, do_gsc, "GSC configuration",
 	"[wd enable [30|60]]|[wd disable]|[sleep <secs>]\n"
 	);

 #endif /* CONFIG_CMD_GSC */
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2013 Gateworks Corporation
	*
	* Author: Tim Harvey <tharvey@gateworks.com>
	*/

	#include <common.h>
	#include <command.h>
	#include <log.h>
	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <common.h>
	#include <i2c.h>
	#include <linux/ctype.h>

	#include <asm/arch/sys_proto.h>
	#include <asm/global_data.h>

	#include "ventana_eeprom.h"
	#include "gsc.h"

	DECLARE_GLOBAL_DATA_PTR;

	/*
	* The Gateworks System Controller will fail to ACK a master transaction if
	* it is busy, which can occur during its 1HZ timer tick while reading ADC's.
	* When this does occur, it will never be busy long enough to fail more than
	* 2 back-to-back transfers. Thus we wrap i2c_read and i2c_write with
	* 3 retries.
	*/
	int gsc_i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
	{
	int retry = 3;
	int n = 0;
	int ret;

	while (n++ < retry) {
	ret = i2c_read(chip, addr, alen, buf, len);
	if (!ret)
	break;
	debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
	n, ret);
	if (ret != -EREMOTEIO)
	break;
	mdelay(10);
	}
	return ret;
	}

	int gsc_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
	{
	int retry = 3;
	int n = 0;
	int ret;

	while (n++ < retry) {
	ret = i2c_write(chip, addr, alen, buf, len);
	if (!ret)
	break;
	debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
	n, ret);
	if (ret != -EREMOTEIO)
	break;
	mdelay(10);
	}
	mdelay(100);
	return ret;
	}

	int gsc_get_board_temp(void)
	{
	const void *fdt = gd->fdt_blob;
	int node, reg, mode, val;
	const char *label;
	u8 buf[2];
	int ret;

	node = fdt_node_offset_by_compatible(fdt, -1, "gw,gsc-adc");
	if (node <= 0)
	return node;
	i2c_set_bus_num(0);

	/* iterate over hwmon nodes */
	node = fdt_first_subnode(fdt, node);
	while (node > 0) {
	reg = fdtdec_get_int(fdt, node, "reg", -1);
	mode = fdtdec_get_int(fdt, node, "gw,mode", -1);
	label = fdt_stringlist_get(fdt, node, "label", 0, NULL);

	if ((reg == -1) \|\| (mode == -1) \|\| !label) {
	printf("invalid dt:%s\n", fdt_get_name(fdt, node, NULL));
	continue;
	}

	if ((mode != 0) \|\| strcmp(label, "temp"))
	continue;

	memset(buf, 0, sizeof(buf));
	ret = gsc_i2c_read(GSC_HWMON_ADDR, reg, 1, buf, sizeof(buf));
	val = buf[0] \| buf[1] << 8;
	if (val >= 0) {
	if (val > 0x8000)
	val -= 0xffff;
	return val;
	}
	node = fdt_next_subnode(fdt, node);
	}

	return 0;
	}

	/* display hardware monitor ADC channels */
	int gsc_hwmon(void)
	{
	const void *fdt = gd->fdt_blob;
	int node, reg, mode, len, val, offset;
	const char *label;
	u8 buf[2];
	int ret;

	node = fdt_node_offset_by_compatible(fdt, -1, "gw,gsc-adc");
	if (node <= 0)
	return node;
	i2c_set_bus_num(0);

	/* iterate over hwmon nodes */
	node = fdt_first_subnode(fdt, node);
	while (node > 0) {
	reg = fdtdec_get_int(fdt, node, "reg", -1);
	mode = fdtdec_get_int(fdt, node, "gw,mode", -1);
	offset = fdtdec_get_int(fdt, node, "gw,voltage-offset-microvolt", 0);
	label = fdt_stringlist_get(fdt, node, "label", 0, NULL);

	if ((reg == -1) \|\| (mode == -1) \|\| !label)
	printf("invalid dt:%s\n", fdt_get_name(fdt, node, NULL));

	memset(buf, 0, sizeof(buf));
	ret = gsc_i2c_read(GSC_HWMON_ADDR, reg, 1, buf, sizeof(buf));
	val = buf[0] \| buf[1] << 8;
	if (val >= 0) {
	const u32 *div;
	int r[2];

	switch (mode) {
	case 0: /* temperature (C10) /
	if (val > 0x8000)
	val -= 0xffff;
	printf("%-8s: %d.%ldC\n", label, val / 10, abs(val % 10));
	break;
	case 1: /* prescaled voltage */
	if (val != 0xffff)
	printf("%-8s: %d.%03dV\n", label, val / 1000, val % 1000);
	break;
	case 2: /* scaled based on ref volt and resolution */
	val *= 2500;
	val /= 1 << 12;

	/* apply pre-scaler voltage divider */
	div = fdt_getprop(fdt, node, "gw,voltage-divider-ohms", &len);
	if (div && (len == sizeof(uint32_t) * 2)) {
	r[0] = fdt32_to_cpu(div[0]);
	r[1] = fdt32_to_cpu(div[1]);
	if (r[0] && r[1]) {
	val *= (r[0] + r[1]);
	val /= r[1];
	}
	}

	/* adjust by offset */
	val += (offset / 1000);

	printf("%-8s: %d.%03dV\n", label, val / 1000, val % 1000);
	break;
	}
	}
	node = fdt_next_subnode(fdt, node);
	}

	return 0;
	}

	int gsc_info(int verbose)
	{
	unsigned char buf[16];

	i2c_set_bus_num(0);
	if (gsc_i2c_read(GSC_SC_ADDR, 0, 1, buf, 16))
	return CMD_RET_FAILURE;

	printf("GSC: v%d", buf[GSC_SC_FWVER]);
	printf(" 0x%04x", buf[GSC_SC_FWCRC] \| buf[GSC_SC_FWCRC+1]<<8);
	printf(" WDT:%sabled", (buf[GSC_SC_CTRL1] & (1<<GSC_SC_CTRL1_WDEN))
	? "en" : "dis");
	if (buf[GSC_SC_STATUS] & (1 << GSC_SC_IRQ_WATCHDOG)) {
	buf[GSC_SC_STATUS] &= ~(1 << GSC_SC_IRQ_WATCHDOG);
	puts(" WDT_RESET");
	gsc_i2c_write(GSC_SC_ADDR, GSC_SC_STATUS, 1,
	&buf[GSC_SC_STATUS], 1);
	}
	printf(" board temp at %dC", gsc_get_board_temp() / 10);
	puts("\n");
	if (!verbose)
	return CMD_RET_SUCCESS;

	gsc_hwmon();

	return 0;
	}

	/*
	* The Gateworks System Controller implements a boot
	* watchdog (always enabled) as a workaround for IMX6 boot related
	* errata such as:
	* ERR005768 - no fix scheduled
	* ERR006282 - fixed in silicon r1.2
	* ERR007117 - fixed in silicon r1.3
	* ERR007220 - fixed in silicon r1.3
	* ERR007926 - no fix scheduled
	* see http://cache.freescale.com/files/32bit/doc/errata/IMX6DQCE.pdf
	*
	* Disable the boot watchdog
	*/
	int gsc_boot_wd_disable(void)
	{
	u8 reg;

	i2c_set_bus_num(CONFIG_I2C_GSC);
	if (!gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1)) {
	reg \|= (1 << GSC_SC_CTRL1_WDDIS);
	if (!gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	return 0;
	}
	puts("Error: could not disable GSC Watchdog\n");
	return 1;
	}

	/* determine BOM revision from model */
	int get_bom_rev(const char *str)
	{
	int rev_bom = 0;
	int i;

	for (i = strlen(str) - 1; i > 0; i--) {
	if (str[i] == '-')
	break;
	if (str[i] >= '1' && str[i] <= '9') {
	rev_bom = str[i] - '0';
	break;
	}
	}
	return rev_bom;
	}

	/* determine PCB revision from model */
	char get_pcb_rev(const char *str)
	{
	char rev_pcb = 'A';
	int i;

	for (i = strlen(str) - 1; i > 0; i--) {
	if (str[i] == '-')
	break;
	if (str[i] >= 'A') {
	rev_pcb = str[i];
	break;
	}
	}
	return rev_pcb;
	}

	/*
	* get dt name based on model and detail level:
	*/
	const char gsc_get_dtb_name(int level, char buf, int sz)
	{
	const char model = (const char )ventana_info.model;
	const char *pre = is_mx6dq() ? "imx6q-" : "imx6dl-";
	int modelno, rev_pcb, rev_bom;

	/* a few board models are dt equivalents to other models */
	if (strncasecmp(model, "gw5906", 6) == 0)
	model = "gw552x-d";
	else if (strncasecmp(model, "gw5908", 6) == 0)
	model = "gw53xx-f";
	else if (strncasecmp(model, "gw5905", 6) == 0)
	model = "gw5904-a";

	modelno = ((model[2] - '0') * 1000)
	+ ((model[3] - '0') * 100)
	+ ((model[4] - '0') * 10)
	+ (model[5] - '0');
	rev_pcb = tolower(get_pcb_rev(model));
	rev_bom = get_bom_rev(model);

	/* compare model/rev/bom in order of most specific to least */
	snprintf(buf, sz, "%s%04d", pre, modelno);
	switch (level) {
	case 0: /* full model first (ie gw5400-a1) */
	if (rev_bom) {
	snprintf(buf, sz, "%sgw%04d-%c%d", pre, modelno, rev_pcb, rev_bom);
	break;
	}
	fallthrough;
	case 1: /* don't care about bom rev (ie gw5400-a) */
	snprintf(buf, sz, "%sgw%04d-%c", pre, modelno, rev_pcb);
	break;
	case 2: /* don't care about the pcb rev (ie gw5400) */
	snprintf(buf, sz, "%sgw%04d", pre, modelno);
	break;
	case 3: /* look for generic model (ie gw540x) */
	snprintf(buf, sz, "%sgw%03dx", pre, modelno / 10);
	break;
	case 4: /* look for more generic model (ie gw54xx) */
	snprintf(buf, sz, "%sgw%02dxx", pre, modelno / 100);
	break;
	default: /* give up */
	return NULL;
	}

	return buf;
	}

	#if defined(CONFIG_CMD_GSC) && !defined(CONFIG_SPL_BUILD)
	static int do_gsc_sleep(struct cmd_tbl *cmdtp, int flag, int argc,
	char *const argv[])
	{
	unsigned char reg;
	unsigned long secs = 0;

	if (argc < 2)
	return CMD_RET_USAGE;

	secs = dectoul(argv[1], NULL);
	printf("GSC Sleeping for %ld seconds\n", secs);

	i2c_set_bus_num(0);
	reg = (secs >> 24) & 0xff;
	if (gsc_i2c_write(GSC_SC_ADDR, 9, 1, &reg, 1))
	goto error;
	reg = (secs >> 16) & 0xff;
	if (gsc_i2c_write(GSC_SC_ADDR, 8, 1, &reg, 1))
	goto error;
	reg = (secs >> 8) & 0xff;
	if (gsc_i2c_write(GSC_SC_ADDR, 7, 1, &reg, 1))
	goto error;
	reg = secs & 0xff;
	if (gsc_i2c_write(GSC_SC_ADDR, 6, 1, &reg, 1))
	goto error;
	if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	goto error;
	reg \|= (1 << 2);
	if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	goto error;
	reg &= ~(1 << 2);
	reg \|= 0x3;
	if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	goto error;

	return CMD_RET_SUCCESS;

	error:
	printf("i2c error\n");
	return CMD_RET_FAILURE;
	}

	static int do_gsc_wd(struct cmd_tbl *cmdtp, int flag, int argc,
	char *const argv[])
	{
	unsigned char reg;

	if (argc < 2)
	return CMD_RET_USAGE;

	if (strcasecmp(argv[1], "enable") == 0) {
	int timeout = 0;

	if (argc > 2)
	timeout = dectoul(argv[2], NULL);
	i2c_set_bus_num(0);
	if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	return CMD_RET_FAILURE;
	reg &= ~((1 << GSC_SC_CTRL1_WDEN) \| (1 << GSC_SC_CTRL1_WDTIME));
	if (timeout == 60)
	reg \|= (1 << GSC_SC_CTRL1_WDTIME);
	else
	timeout = 30;
	reg \|= (1 << GSC_SC_CTRL1_WDEN);
	if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	return CMD_RET_FAILURE;
	printf("GSC Watchdog enabled with timeout=%d seconds\n",
	timeout);
	} else if (strcasecmp(argv[1], "disable") == 0) {
	i2c_set_bus_num(0);
	if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	return CMD_RET_FAILURE;
	reg &= ~((1 << GSC_SC_CTRL1_WDEN) \| (1 << GSC_SC_CTRL1_WDTIME));
	if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
	return CMD_RET_FAILURE;
	printf("GSC Watchdog disabled\n");
	} else {
	return CMD_RET_USAGE;
	}
	return CMD_RET_SUCCESS;
	}

	static int do_gsc(struct cmd_tbl cmdtp, int flag, int argc, char const argv[])
	{
	if (argc < 2)
	return gsc_info(1);

	if (strcasecmp(argv[1], "wd") == 0)
	return do_gsc_wd(cmdtp, flag, --argc, ++argv);
	else if (strcasecmp(argv[1], "sleep") == 0)
	return do_gsc_sleep(cmdtp, flag, --argc, ++argv);

	return CMD_RET_USAGE;
	}

	U_BOOT_CMD(
	gsc, 4, 1, do_gsc, "GSC configuration",
	"[wd enable [30\|60]]\|[wd disable]\|[sleep <secs>]\n"
	);

	#endif /* CONFIG_CMD_GSC */