u-boot-brain/board/st/stm32mp1/stm32mp1.c

// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
 * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
 */
#include <common.h>
#include <adc.h>
#include <config.h>
#include <clk.h>
#include <dm.h>
#include <g_dnl.h>
#include <generic-phy.h>
#include <led.h>
#include <misc.h>
#include <phy.h>
#include <reset.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/arch/stm32.h>
#include <power/regulator.h>

/* SYSCFG registers */
#define SYSCFG_BOOTR		0x00
#define SYSCFG_PMCSETR		0x04
#define SYSCFG_IOCTRLSETR	0x18
#define SYSCFG_ICNR		0x1C
#define SYSCFG_CMPCR		0x20
#define SYSCFG_CMPENSETR	0x24
#define SYSCFG_PMCCLRR		0x44

#define SYSCFG_BOOTR_BOOT_MASK		GENMASK(2, 0)
#define SYSCFG_BOOTR_BOOTPD_SHIFT	4

#define SYSCFG_IOCTRLSETR_HSLVEN_TRACE		BIT(0)
#define SYSCFG_IOCTRLSETR_HSLVEN_QUADSPI	BIT(1)
#define SYSCFG_IOCTRLSETR_HSLVEN_ETH		BIT(2)
#define SYSCFG_IOCTRLSETR_HSLVEN_SDMMC		BIT(3)
#define SYSCFG_IOCTRLSETR_HSLVEN_SPI		BIT(4)

#define SYSCFG_CMPCR_SW_CTRL		BIT(1)
#define SYSCFG_CMPCR_READY		BIT(8)

#define SYSCFG_CMPENSETR_MPU_EN		BIT(0)

#define SYSCFG_PMCSETR_ETH_CLK_SEL	BIT(16)
#define SYSCFG_PMCSETR_ETH_REF_CLK_SEL	BIT(17)

#define SYSCFG_PMCSETR_ETH_SELMII	BIT(20)

#define SYSCFG_PMCSETR_ETH_SEL_MASK	GENMASK(23, 21)
#define SYSCFG_PMCSETR_ETH_SEL_GMII_MII	(0 << 21)
#define SYSCFG_PMCSETR_ETH_SEL_RGMII	(1 << 21)
#define SYSCFG_PMCSETR_ETH_SEL_RMII	(4 << 21)

/*
 * Get a global data pointer
 */
DECLARE_GLOBAL_DATA_PTR;

#define USB_WARNING_LOW_THRESHOLD_UV	660000
#define USB_START_LOW_THRESHOLD_UV	1230000
#define USB_START_HIGH_THRESHOLD_UV	2100000

int checkboard(void)
{
	int ret;
	char *mode;
	u32 otp;
	struct udevice *dev;
	const char *fdt_compat;
	int fdt_compat_len;

	if (IS_ENABLED(CONFIG_STM32MP1_TRUSTED))
		mode = "trusted";
	else
		mode = "basic";

	printf("Board: stm32mp1 in %s mode", mode);
	fdt_compat = fdt_getprop(gd->fdt_blob, 0, "compatible",
				 &fdt_compat_len);
	if (fdt_compat && fdt_compat_len)
		printf(" (%s)", fdt_compat);
	puts("\n");

	ret = uclass_get_device_by_driver(UCLASS_MISC,
					  DM_GET_DRIVER(stm32mp_bsec),
					  &dev);

	if (!ret)
		ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_BOARD),
				&otp, sizeof(otp));
	if (!ret && otp) {
		printf("Board: MB%04x Var%d Rev.%c-%02d\n",
		       otp >> 16,
		       (otp >> 12) & 0xF,
		       ((otp >> 8) & 0xF) - 1 + 'A',
		       otp & 0xF);
	}

	return 0;
}

static void board_key_check(void)
{
#if defined(CONFIG_FASTBOOT) || defined(CONFIG_CMD_STM32PROG)
	ofnode node;
	struct gpio_desc gpio;
	enum forced_boot_mode boot_mode = BOOT_NORMAL;

	node = ofnode_path("/config");
	if (!ofnode_valid(node)) {
		debug("%s: no /config node?\n", __func__);
		return;
	}
#ifdef CONFIG_FASTBOOT
	if (gpio_request_by_name_nodev(node, "st,fastboot-gpios", 0,
				       &gpio, GPIOD_IS_IN)) {
		debug("%s: could not find a /config/st,fastboot-gpios\n",
		      __func__);
	} else {
		if (dm_gpio_get_value(&gpio)) {
			puts("Fastboot key pressed, ");
			boot_mode = BOOT_FASTBOOT;
		}

		dm_gpio_free(NULL, &gpio);
	}
#endif
#ifdef CONFIG_CMD_STM32PROG
	if (gpio_request_by_name_nodev(node, "st,stm32prog-gpios", 0,
				       &gpio, GPIOD_IS_IN)) {
		debug("%s: could not find a /config/st,stm32prog-gpios\n",
		      __func__);
	} else {
		if (dm_gpio_get_value(&gpio)) {
			puts("STM32Programmer key pressed, ");
			boot_mode = BOOT_STM32PROG;
		}
		dm_gpio_free(NULL, &gpio);
	}
#endif

	if (boot_mode != BOOT_NORMAL) {
		puts("entering download mode...\n");
		clrsetbits_le32(TAMP_BOOT_CONTEXT,
				TAMP_BOOT_FORCED_MASK,
				boot_mode);
	}
#endif
}

#if defined(CONFIG_USB_GADGET) && defined(CONFIG_USB_GADGET_DWC2_OTG)

int g_dnl_board_usb_cable_connected(void)
{
	struct udevice *dwc2_udc_otg;
	int ret;

	ret = uclass_get_device_by_driver(UCLASS_USB_GADGET_GENERIC,
					  DM_GET_DRIVER(dwc2_udc_otg),
					  &dwc2_udc_otg);
	if (!ret)
		debug("dwc2_udc_otg init failed\n");

	return dwc2_udc_B_session_valid(dwc2_udc_otg);
}
#endif /* CONFIG_USB_GADGET */

static int get_led(struct udevice **dev, char *led_string)
{
	char *led_name;
	int ret;

	led_name = fdtdec_get_config_string(gd->fdt_blob, led_string);
	if (!led_name) {
		pr_debug("%s: could not find %s config string\n",
			 __func__, led_string);
		return -ENOENT;
	}
	ret = led_get_by_label(led_name, dev);
	if (ret) {
		debug("%s: get=%d\n", __func__, ret);
		return ret;
	}

	return 0;
}

static int setup_led(enum led_state_t cmd)
{
	struct udevice *dev;
	int ret;

	ret = get_led(&dev, "u-boot,boot-led");
	if (ret)
		return ret;

	ret = led_set_state(dev, cmd);
	return ret;
}

static int board_check_usb_power(void)
{
	struct ofnode_phandle_args adc_args;
	struct udevice *adc;
	struct udevice *led;
	ofnode node;
	unsigned int raw;
	int max_uV = 0;
	int ret, uV, adc_count;
	u8 i, nb_blink;

	node = ofnode_path("/config");
	if (!ofnode_valid(node)) {
		debug("%s: no /config node?\n", __func__);
		return -ENOENT;
	}

	/*
	 * Retrieve the ADC channels devices and get measurement
	 * for each of them
	 */
	adc_count = ofnode_count_phandle_with_args(node, "st,adc_usb_pd",
						   "#io-channel-cells");
	if (adc_count < 0) {
		if (adc_count == -ENOENT)
			return 0;

		pr_err("%s: can't find adc channel (%d)\n", __func__,
		       adc_count);

		return adc_count;
	}

	for (i = 0; i < adc_count; i++) {
		if (ofnode_parse_phandle_with_args(node, "st,adc_usb_pd",
						   "#io-channel-cells", 0, i,
						   &adc_args)) {
			pr_debug("%s: can't find /config/st,adc_usb_pd\n",
				 __func__);
			return 0;
		}

		ret = uclass_get_device_by_ofnode(UCLASS_ADC, adc_args.node,
						  &adc);

		if (ret) {
			pr_err("%s: Can't get adc device(%d)\n", __func__,
			       ret);
			return ret;
		}

		ret = adc_channel_single_shot(adc->name, adc_args.args[0],
					      &raw);
		if (ret) {
			pr_err("%s: single shot failed for %s[%d]!\n",
			       __func__, adc->name, adc_args.args[0]);
			return ret;
		}
		/* Convert to uV */
		if (!adc_raw_to_uV(adc, raw, &uV)) {
			if (uV > max_uV)
				max_uV = uV;
			pr_debug("%s: %s[%02d] = %u, %d uV\n", __func__,
				 adc->name, adc_args.args[0], raw, uV);
		} else {
			pr_err("%s: Can't get uV value for %s[%d]\n",
			       __func__, adc->name, adc_args.args[0]);
		}
	}

	/*
	 * If highest value is inside 1.23 Volts and 2.10 Volts, that means
	 * board is plugged on an USB-C 3A power supply and boot process can
	 * continue.
	 */
	if (max_uV > USB_START_LOW_THRESHOLD_UV &&
	    max_uV < USB_START_HIGH_THRESHOLD_UV)
		return 0;

	/* Display warning message and make u-boot,error-led blinking */
	pr_err("\n*******************************************\n");

	if (max_uV < USB_WARNING_LOW_THRESHOLD_UV) {
		pr_err("*   WARNING 500mA power supply detected   *\n");
		nb_blink = 2;
	} else {
		pr_err("* WARNING 1.5A power supply detected      *\n");
		nb_blink = 3;
	}

	pr_err("* Current too low, use a 3A power supply! *\n");
	pr_err("*******************************************\n\n");

	ret = get_led(&led, "u-boot,error-led");
	if (ret)
		return ret;

	for (i = 0; i < nb_blink * 2; i++) {
		led_set_state(led, LEDST_TOGGLE);
		mdelay(125);
	}
	led_set_state(led, LEDST_ON);

	return 0;
}

static void sysconf_init(void)
{
#ifndef CONFIG_STM32MP1_TRUSTED
	u8 *syscfg;
#ifdef CONFIG_DM_REGULATOR
	struct udevice *pwr_dev;
	struct udevice *pwr_reg;
	struct udevice *dev;
	int ret;
	u32 otp = 0;
#endif
	u32 bootr;

	syscfg = (u8 *)syscon_get_first_range(STM32MP_SYSCON_SYSCFG);

	/* interconnect update : select master using the port 1 */
	/* LTDC = AXI_M9 */
	/* GPU  = AXI_M8 */
	/* today information is hardcoded in U-Boot */
	writel(BIT(9), syscfg + SYSCFG_ICNR);

	/* disable Pull-Down for boot pin connected to VDD */
	bootr = readl(syscfg + SYSCFG_BOOTR);
	bootr &= ~(SYSCFG_BOOTR_BOOT_MASK << SYSCFG_BOOTR_BOOTPD_SHIFT);
	bootr |= (bootr & SYSCFG_BOOTR_BOOT_MASK) << SYSCFG_BOOTR_BOOTPD_SHIFT;
	writel(bootr, syscfg + SYSCFG_BOOTR);

#ifdef CONFIG_DM_REGULATOR
	/* High Speed Low Voltage Pad mode Enable for SPI, SDMMC, ETH, QSPI
	 * and TRACE. Needed above ~50MHz and conditioned by AFMUX selection.
	 * The customer will have to disable this for low frequencies
	 * or if AFMUX is selected but the function not used, typically for
	 * TRACE. Otherwise, impact on power consumption.
	 *
	 * WARNING:
	 *   enabling High Speed mode while VDD>2.7V
	 *   with the OTP product_below_2v5 (OTP 18, BIT 13)
	 *   erroneously set to 1 can damage the IC!
	 *   => U-Boot set the register only if VDD < 2.7V (in DT)
	 *      but this value need to be consistent with board design
	 */
	ret = syscon_get_by_driver_data(STM32MP_SYSCON_PWR, &pwr_dev);
	if (!ret) {
		ret = uclass_get_device_by_driver(UCLASS_MISC,
						  DM_GET_DRIVER(stm32mp_bsec),
						  &dev);
		if (ret) {
			pr_err("Can't find stm32mp_bsec driver\n");
			return;
		}

		ret = misc_read(dev, STM32_BSEC_SHADOW(18), &otp, 4);
		if (!ret)
			otp = otp & BIT(13);

		/* get VDD = pwr-supply */
		ret = device_get_supply_regulator(pwr_dev, "pwr-supply",
						  &pwr_reg);

		/* check if VDD is Low Voltage */
		if (!ret) {
			if (regulator_get_value(pwr_reg) < 2700000) {
				writel(SYSCFG_IOCTRLSETR_HSLVEN_TRACE |
				       SYSCFG_IOCTRLSETR_HSLVEN_QUADSPI |
				       SYSCFG_IOCTRLSETR_HSLVEN_ETH |
				       SYSCFG_IOCTRLSETR_HSLVEN_SDMMC |
				       SYSCFG_IOCTRLSETR_HSLVEN_SPI,
				       syscfg + SYSCFG_IOCTRLSETR);

				if (!otp)
					pr_err("product_below_2v5=0: HSLVEN protected by HW\n");
			} else {
				if (otp)
					pr_err("product_below_2v5=1: HSLVEN update is destructive, no update as VDD>2.7V\n");
			}
		} else {
			debug("VDD unknown");
		}
	}
#endif

	/* activate automatic I/O compensation
	 * warning: need to ensure CSI enabled and ready in clock driver
	 */
	writel(SYSCFG_CMPENSETR_MPU_EN, syscfg + SYSCFG_CMPENSETR);

	while (!(readl(syscfg + SYSCFG_CMPCR) & SYSCFG_CMPCR_READY))
		;
	clrbits_le32(syscfg + SYSCFG_CMPCR, SYSCFG_CMPCR_SW_CTRL);
#endif
}

/* board dependent setup after realloc */
int board_init(void)
{
	struct udevice *dev;

	/* address of boot parameters */
	gd->bd->bi_boot_params = STM32_DDR_BASE + 0x100;

	/* probe all PINCTRL for hog */
	for (uclass_first_device(UCLASS_PINCTRL, &dev);
	     dev;
	     uclass_next_device(&dev)) {
		pr_debug("probe pincontrol = %s\n", dev->name);
	}

	board_key_check();

	sysconf_init();

	if (IS_ENABLED(CONFIG_LED))
		led_default_state();

	return 0;
}

int board_late_init(void)
{
#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
	const void *fdt_compat;
	int fdt_compat_len;

	fdt_compat = fdt_getprop(gd->fdt_blob, 0, "compatible",
				 &fdt_compat_len);
	if (fdt_compat && fdt_compat_len) {
		if (strncmp(fdt_compat, "st,", 3) != 0)
			env_set("board_name", fdt_compat);
		else
			env_set("board_name", fdt_compat + 3);
	}
#endif

	/* for DK1/DK2 boards */
	board_check_usb_power();

	return 0;
}

void board_quiesce_devices(void)
{
	setup_led(LEDST_OFF);
}