arch/arm/mach-stm32mp/cpu.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
 /*
  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
  */

 #define LOG_CATEGORY LOGC_ARCH

 #include <common.h>
 #include <clk.h>
 #include <cpu_func.h>
 #include <debug_uart.h>
 #include <env.h>
 #include <init.h>
 #include <log.h>
 #include <lmb.h>
 #include <misc.h>
 #include <net.h>
 #include <asm/io.h>
 #include <asm/arch/bsec.h>
 #include <asm/arch/stm32.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/global_data.h>
 #include <dm/device.h>
 #include <dm/uclass.h>
 #include <linux/bitops.h>

 /* RCC register */
 #define RCC_TZCR		(STM32_RCC_BASE + 0x00)
 #define RCC_DBGCFGR		(STM32_RCC_BASE + 0x080C)
 #define RCC_BDCR		(STM32_RCC_BASE + 0x0140)
 #define RCC_MP_APB5ENSETR	(STM32_RCC_BASE + 0x0208)
 #define RCC_MP_AHB5ENSETR	(STM32_RCC_BASE + 0x0210)
 #define RCC_BDCR_VSWRST		BIT(31)
 #define RCC_BDCR_RTCSRC		GENMASK(17, 16)
 #define RCC_DBGCFGR_DBGCKEN	BIT(8)

 /* Security register */
 #define ETZPC_TZMA1_SIZE	(STM32_ETZPC_BASE + 0x04)
 #define ETZPC_DECPROT0		(STM32_ETZPC_BASE + 0x10)

 #define TZC_GATE_KEEPER		(STM32_TZC_BASE + 0x008)
 #define TZC_REGION_ATTRIBUTE0	(STM32_TZC_BASE + 0x110)
 #define TZC_REGION_ID_ACCESS0	(STM32_TZC_BASE + 0x114)

 #define TAMP_CR1		(STM32_TAMP_BASE + 0x00)

 #define PWR_CR1			(STM32_PWR_BASE + 0x00)
 #define PWR_MCUCR		(STM32_PWR_BASE + 0x14)
 #define PWR_CR1_DBP		BIT(8)
 #define PWR_MCUCR_SBF		BIT(6)

 /* DBGMCU register */
 #define DBGMCU_IDC		(STM32_DBGMCU_BASE + 0x00)
 #define DBGMCU_APB4FZ1		(STM32_DBGMCU_BASE + 0x2C)
 #define DBGMCU_APB4FZ1_IWDG2	BIT(2)
 #define DBGMCU_IDC_DEV_ID_MASK	GENMASK(11, 0)
 #define DBGMCU_IDC_DEV_ID_SHIFT	0
 #define DBGMCU_IDC_REV_ID_MASK	GENMASK(31, 16)
 #define DBGMCU_IDC_REV_ID_SHIFT	16

 /* GPIOZ registers */
 #define GPIOZ_SECCFGR		0x54004030

 /* boot interface from Bootrom
  * - boot instance = bit 31:16
  * - boot device = bit 15:0
  */
 #define BOOTROM_PARAM_ADDR	0x2FFC0078
 #define BOOTROM_MODE_MASK	GENMASK(15, 0)
 #define BOOTROM_MODE_SHIFT	0
 #define BOOTROM_INSTANCE_MASK	 GENMASK(31, 16)
 #define BOOTROM_INSTANCE_SHIFT	16

 /* Device Part Number (RPN) = OTP_DATA1 lower 8 bits */
 #define RPN_SHIFT	0
 #define RPN_MASK	GENMASK(7, 0)

 /* Package = bit 27:29 of OTP16
  * - 100: LBGA448 (FFI) => AA = LFBGA 18x18mm 448 balls p. 0.8mm
  * - 011: LBGA354 (LCI) => AB = LFBGA 16x16mm 359 balls p. 0.8mm
  * - 010: TFBGA361 (FFC) => AC = TFBGA 12x12mm 361 balls p. 0.5mm
  * - 001: TFBGA257 (LCC) => AD = TFBGA 10x10mm 257 balls p. 0.5mm
  * - others: Reserved
  */
 #define PKG_SHIFT	27
 #define PKG_MASK	GENMASK(2, 0)

 /*
  * early TLB into the .data section so that it not get cleared
  * with 16kB allignment (see TTBR0_BASE_ADDR_MASK)
  */
 u8 early_tlb[PGTABLE_SIZE] __section(".data") __aligned(0x4000);

 struct lmb lmb;

 static void security_init(void)
 {
 	/* Disable the backup domain write protection */
 	/* the protection is enable at each reset by hardware */
 	/* And must be disable by software */
 	setbits_le32(PWR_CR1, PWR_CR1_DBP);

 	while (!(readl(PWR_CR1) & PWR_CR1_DBP))
 		;

 	/* If RTC clock isn't enable so this is a cold boot then we need
 	 * to reset the backup domain
 	 */
 	if (!(readl(RCC_BDCR) & RCC_BDCR_RTCSRC)) {
 		setbits_le32(RCC_BDCR, RCC_BDCR_VSWRST);
 		while (!(readl(RCC_BDCR) & RCC_BDCR_VSWRST))
 			;
 		clrbits_le32(RCC_BDCR, RCC_BDCR_VSWRST);
 	}

 	/* allow non secure access in Write/Read for all peripheral */
 	writel(GENMASK(25, 0), ETZPC_DECPROT0);

 	/* Open SYSRAM for no secure access */
 	writel(0x0, ETZPC_TZMA1_SIZE);

 	/* enable TZC1 TZC2 clock */
 	writel(BIT(11) | BIT(12), RCC_MP_APB5ENSETR);

 	/* Region 0 set to no access by default */
 	/* bit 0 / 16 => nsaid0 read/write Enable
 	 * bit 1 / 17 => nsaid1 read/write Enable
 	 * ...
 	 * bit 15 / 31 => nsaid15 read/write Enable
 	 */
 	writel(0xFFFFFFFF, TZC_REGION_ID_ACCESS0);
 	/* bit 30 / 31 => Secure Global Enable : write/read */
 	/* bit 0 / 1 => Region Enable for filter 0/1 */
 	writel(BIT(0) | BIT(1) | BIT(30) | BIT(31), TZC_REGION_ATTRIBUTE0);

 	/* Enable Filter 0 and 1 */
 	setbits_le32(TZC_GATE_KEEPER, BIT(0) | BIT(1));

 	/* RCC trust zone deactivated */
 	writel(0x0, RCC_TZCR);

 	/* TAMP: deactivate the internal tamper
 	 * Bit 23 ITAMP8E: monotonic counter overflow
 	 * Bit 20 ITAMP5E: RTC calendar overflow
 	 * Bit 19 ITAMP4E: HSE monitoring
 	 * Bit 18 ITAMP3E: LSE monitoring
 	 * Bit 16 ITAMP1E: RTC power domain supply monitoring
 	 */
 	writel(0x0, TAMP_CR1);

 	/* GPIOZ: deactivate the security */
 	writel(BIT(0), RCC_MP_AHB5ENSETR);
 	writel(0x0, GPIOZ_SECCFGR);
 }

 /*
  * Debug init
  */
 static void dbgmcu_init(void)
 {
 	/*
 	 * Freeze IWDG2 if Cortex-A7 is in debug mode
 	 * done in TF-A for TRUSTED boot and
 	 * DBGMCU access is controlled by BSEC_DENABLE.DBGSWENABLE
 	*/
 	if (bsec_dbgswenable()) {
 		setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN);
 		setbits_le32(DBGMCU_APB4FZ1, DBGMCU_APB4FZ1_IWDG2);
 	}
 }

 void spl_board_init(void)
 {
 	struct udevice *dev;
 	int ret;

 	dbgmcu_init();

 	/* force probe of BSEC driver to shadow the upper OTP */
 	ret = uclass_get_device_by_driver(UCLASS_MISC, DM_DRIVER_GET(stm32mp_bsec), &dev);
 	if (ret)
 		log_warning("BSEC probe failed: %d\n", ret);
 }

 /* get bootmode from ROM code boot context: saved in TAMP register */
 static void update_bootmode(void)
 {
 	u32 boot_mode;
 	u32 bootrom_itf = readl(BOOTROM_PARAM_ADDR);
 	u32 bootrom_device, bootrom_instance;

 	/* enable TAMP clock = RTCAPBEN */
 	writel(BIT(8), RCC_MP_APB5ENSETR);

 	/* read bootrom context */
 	bootrom_device =
 		(bootrom_itf & BOOTROM_MODE_MASK) >> BOOTROM_MODE_SHIFT;
 	bootrom_instance =
 		(bootrom_itf & BOOTROM_INSTANCE_MASK) >> BOOTROM_INSTANCE_SHIFT;
 	boot_mode =
 		((bootrom_device << BOOT_TYPE_SHIFT) & BOOT_TYPE_MASK) |
 		((bootrom_instance << BOOT_INSTANCE_SHIFT) &
 		 BOOT_INSTANCE_MASK);

 	/* save the boot mode in TAMP backup register */
 	clrsetbits_le32(TAMP_BOOT_CONTEXT,
 			TAMP_BOOT_MODE_MASK,
 			boot_mode << TAMP_BOOT_MODE_SHIFT);
 }

 u32 get_bootmode(void)
 {
 	/* read bootmode from TAMP backup register */
 	return (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_MODE_MASK) >>
 		    TAMP_BOOT_MODE_SHIFT;
 }

 /*
  * weak function overidde: set the DDR/SYSRAM executable before to enable the
  * MMU and configure DACR, for early early_enable_caches (SPL or pre-reloc)
  */
 void dram_bank_mmu_setup(int bank)
 {
 	struct bd_info *bd = gd->bd;
 	int	i;
 	phys_addr_t start;
 	phys_size_t size;
 	bool use_lmb = false;
 	enum dcache_option option;

 	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
 		start = ALIGN_DOWN(STM32_SYSRAM_BASE, MMU_SECTION_SIZE);
 		size = ALIGN(STM32_SYSRAM_SIZE, MMU_SECTION_SIZE);
 	} else if (gd->flags & GD_FLG_RELOC) {
 		/* bd->bi_dram is available only after relocation */
 		start = bd->bi_dram[bank].start;
 		size =  bd->bi_dram[bank].size;
 		use_lmb = true;
 	} else {
 		/* mark cacheable and executable the beggining of the DDR */
 		start = STM32_DDR_BASE;
 		size = CONFIG_DDR_CACHEABLE_SIZE;
 	}

 	for (i = start >> MMU_SECTION_SHIFT;
 	     i < (start >> MMU_SECTION_SHIFT) + (size >> MMU_SECTION_SHIFT);
 	     i++) {
 		option = DCACHE_DEFAULT_OPTION;
 		if (use_lmb && lmb_is_reserved_flags(&lmb, i << MMU_SECTION_SHIFT, LMB_NOMAP))
 			option = 0; /* INVALID ENTRY in TLB */
 		set_section_dcache(i, option);
 	}
 }
 /*
  * initialize the MMU and activate cache in SPL or in U-Boot pre-reloc stage
  * MMU/TLB is updated in enable_caches() for U-Boot after relocation
  * or is deactivated in U-Boot entry function start.S::cpu_init_cp15
  */
 static void early_enable_caches(void)
 {
 	/* I-cache is already enabled in start.S: cpu_init_cp15 */

 	if (CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
 		return;

 	if (!(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))) {
 		gd->arch.tlb_size = PGTABLE_SIZE;
 		gd->arch.tlb_addr = (unsigned long)&early_tlb;
 	}

 	/* enable MMU (default configuration) */
 	dcache_enable();
 }

 /*
  * Early system init
  */
 int arch_cpu_init(void)
 {
 	u32 boot_mode;

 	early_enable_caches();

 	/* early armv7 timer init: needed for polling */
 	timer_init();

 	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
 		security_init();
 		update_bootmode();
 	}
 /* reset copro state in SPL, when used, or in U-Boot */
 	if (!IS_ENABLED(CONFIG_SPL) || IS_ENABLED(CONFIG_SPL_BUILD)) {
 		/* Reset Coprocessor state unless it wakes up from Standby power mode */
 		if (!(readl(PWR_MCUCR) & PWR_MCUCR_SBF)) {
 			writel(TAMP_COPRO_STATE_OFF, TAMP_COPRO_STATE);
 			writel(0, TAMP_COPRO_RSC_TBL_ADDRESS);
 		}
 	}

 	boot_mode = get_bootmode();

 	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) &&
 	    (boot_mode & TAMP_BOOT_DEVICE_MASK) == BOOT_SERIAL_UART)
 		gd->flags |= GD_FLG_SILENT | GD_FLG_DISABLE_CONSOLE;
 	else if (IS_ENABLED(CONFIG_DEBUG_UART) && IS_ENABLED(CONFIG_SPL_BUILD))
 		debug_uart_init();

 	return 0;
 }

 void enable_caches(void)
 {
 	/* parse device tree when data cache is still activated */
 	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);

 	/* I-cache is already enabled in start.S: icache_enable() not needed */

 	/* deactivate the data cache, early enabled in arch_cpu_init() */
 	dcache_disable();
 	/*
 	 * update MMU after relocation and enable the data cache
 	 * warning: the TLB location udpated in board_f.c::reserve_mmu
 	 */
 	dcache_enable();
 }

 static u32 read_idc(void)
 {
 	/* DBGMCU access is controlled by BSEC_DENABLE.DBGSWENABLE */
 	if (bsec_dbgswenable()) {
 		setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN);

 		return readl(DBGMCU_IDC);
 	}

 	if (CONFIG_IS_ENABLED(STM32MP15x))
 		return CPU_DEV_STM32MP15; /* STM32MP15x and unknown revision */
 	else
 		return 0x0;
 }

 u32 get_cpu_dev(void)
 {
 	return (read_idc() & DBGMCU_IDC_DEV_ID_MASK) >> DBGMCU_IDC_DEV_ID_SHIFT;
 }

 u32 get_cpu_rev(void)
 {
 	return (read_idc() & DBGMCU_IDC_REV_ID_MASK) >> DBGMCU_IDC_REV_ID_SHIFT;
 }

 static u32 get_otp(int index, int shift, int mask)
 {
 	int ret;
 	struct udevice *dev;
 	u32 otp = 0;

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

 	if (!ret)
 		ret = misc_read(dev, STM32_BSEC_SHADOW(index),
 				&otp, sizeof(otp));

 	return (otp >> shift) & mask;
 }

 /* Get Device Part Number (RPN) from OTP */
 static u32 get_cpu_rpn(void)
 {
 	return get_otp(BSEC_OTP_RPN, RPN_SHIFT, RPN_MASK);
 }

 u32 get_cpu_type(void)
 {
 	return (get_cpu_dev() << 16) | get_cpu_rpn();
 }

 /* Get Package options from OTP */
 u32 get_cpu_package(void)
 {
 	return get_otp(BSEC_OTP_PKG, PKG_SHIFT, PKG_MASK);
 }

 static const char * const soc_type[] = {
 	"????",
 	"151C", "151A", "151F", "151D",
 	"153C", "153A", "153F", "153D",
 	"157C", "157A", "157F", "157D"
 };

 static const char * const soc_pkg[] = { "??", "AD", "AC", "AB", "AA" };
 static const char * const soc_rev[] = { "?", "A", "B", "Z" };

 static void get_cpu_string_offsets(unsigned int *type, unsigned int *pkg,
 				   unsigned int *rev)
 {
 	u32 cpu_type = get_cpu_type();
 	u32 ct = cpu_type & ~(BIT(7) | BIT(0));
 	u32 cm = ((cpu_type & BIT(7)) >> 6) | (cpu_type & BIT(0));
 	u32 cp = get_cpu_package();

 	/* Bits 0 and 7 are the ACDF, 00:C 01:A 10:F 11:D */
 	switch (ct) {
 	case CPU_STM32MP151Cxx:
 		*type = cm + 1;
 		break;
 	case CPU_STM32MP153Cxx:
 		*type = cm + 5;
 		break;
 	case CPU_STM32MP157Cxx:
 		*type = cm + 9;
 		break;
 	default:
 		*type = 0;
 		break;
 	}

 	/* Package */
 	switch (cp) {
 	case PKG_AA_LBGA448:
 	case PKG_AB_LBGA354:
 	case PKG_AC_TFBGA361:
 	case PKG_AD_TFBGA257:
 		*pkg = cp;
 		break;
 	default:
 		*pkg = 0;
 		break;
 	}

 	/* Revision */
 	switch (get_cpu_rev()) {
 	case CPU_REV1:
 		*rev = 1;
 		break;
 	case CPU_REV2:
 		*rev = 2;
 		break;
 	case CPU_REV2_1:
 		*rev = 3;
 		break;
 	default:
 		*rev = 0;
 		break;
 	}
 }

 void get_soc_name(char name[SOC_NAME_SIZE])
 {
 	unsigned int type, pkg, rev;

 	get_cpu_string_offsets(&type, &pkg, &rev);

 	snprintf(name, SOC_NAME_SIZE, "STM32MP%s%s Rev.%s",
 		 soc_type[type], soc_pkg[pkg], soc_rev[rev]);
 }

 /* used when CONFIG_DISPLAY_CPUINFO is activated */
 int print_cpuinfo(void)
 {
 	char name[SOC_NAME_SIZE];

 	get_soc_name(name);
 	printf("CPU: %s\n", name);

 	return 0;
 }

 static void setup_boot_mode(void)
 {
 	const u32 serial_addr[] = {
 		STM32_USART1_BASE,
 		STM32_USART2_BASE,
 		STM32_USART3_BASE,
 		STM32_UART4_BASE,
 		STM32_UART5_BASE,
 		STM32_USART6_BASE,
 		STM32_UART7_BASE,
 		STM32_UART8_BASE
 	};
 	const u32 sdmmc_addr[] = {
 		STM32_SDMMC1_BASE,
 		STM32_SDMMC2_BASE,
 		STM32_SDMMC3_BASE
 	};
 	char cmd[60];
 	u32 boot_ctx = readl(TAMP_BOOT_CONTEXT);
 	u32 boot_mode =
 		(boot_ctx & TAMP_BOOT_MODE_MASK) >> TAMP_BOOT_MODE_SHIFT;
 	unsigned int instance = (boot_mode & TAMP_BOOT_INSTANCE_MASK) - 1;
 	u32 forced_mode = (boot_ctx & TAMP_BOOT_FORCED_MASK);
 	struct udevice *dev;

 	log_debug("%s: boot_ctx=0x%x => boot_mode=%x, instance=%d forced=%x\n",
 		  __func__, boot_ctx, boot_mode, instance, forced_mode);
 	switch (boot_mode & TAMP_BOOT_DEVICE_MASK) {
 	case BOOT_SERIAL_UART:
 		if (instance > ARRAY_SIZE(serial_addr))
 			break;
 		/* serial : search associated node in devicetree */
 		sprintf(cmd, "serial@%x", serial_addr[instance]);
 		if (uclass_get_device_by_name(UCLASS_SERIAL, cmd, &dev)) {
 			/* restore console on error */
 			if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL))
 				gd->flags &= ~(GD_FLG_SILENT |
 					       GD_FLG_DISABLE_CONSOLE);
 			log_err("uart%d = %s not found in device tree!\n",
 				instance + 1, cmd);
 			break;
 		}
 		sprintf(cmd, "%d", dev_seq(dev));
 		env_set("boot_device", "serial");
 		env_set("boot_instance", cmd);

 		/* restore console on uart when not used */
 		if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) && gd->cur_serial_dev != dev) {
 			gd->flags &= ~(GD_FLG_SILENT |
 				       GD_FLG_DISABLE_CONSOLE);
 			log_info("serial boot with console enabled!\n");
 		}
 		break;
 	case BOOT_SERIAL_USB:
 		env_set("boot_device", "usb");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_FLASH_SD:
 	case BOOT_FLASH_EMMC:
 		if (instance > ARRAY_SIZE(sdmmc_addr))
 			break;
 		/* search associated sdmmc node in devicetree */
 		sprintf(cmd, "mmc@%x", sdmmc_addr[instance]);
 		if (uclass_get_device_by_name(UCLASS_MMC, cmd, &dev)) {
 			printf("mmc%d = %s not found in device tree!\n",
 			       instance, cmd);
 			break;
 		}
 		sprintf(cmd, "%d", dev_seq(dev));
 		env_set("boot_device", "mmc");
 		env_set("boot_instance", cmd);
 		break;
 	case BOOT_FLASH_NAND:
 		env_set("boot_device", "nand");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_FLASH_SPINAND:
 		env_set("boot_device", "spi-nand");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_FLASH_NOR:
 		env_set("boot_device", "nor");
 		env_set("boot_instance", "0");
 		break;
 	default:
 		env_set("boot_device", "invalid");
 		env_set("boot_instance", "");
 		log_err("unexpected boot mode = %x\n", boot_mode);
 		break;
 	}

 	switch (forced_mode) {
 	case BOOT_FASTBOOT:
 		log_info("Enter fastboot!\n");
 		env_set("preboot", "env set preboot; fastboot 0");
 		break;
 	case BOOT_STM32PROG:
 		env_set("boot_device", "usb");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_UMS_MMC0:
 	case BOOT_UMS_MMC1:
 	case BOOT_UMS_MMC2:
 		log_info("Enter UMS!\n");
 		instance = forced_mode - BOOT_UMS_MMC0;
 		sprintf(cmd, "env set preboot; ums 0 mmc %d", instance);
 		env_set("preboot", cmd);
 		break;
 	case BOOT_RECOVERY:
 		env_set("preboot", "env set preboot; run altbootcmd");
 		break;
 	case BOOT_NORMAL:
 		break;
 	default:
 		log_debug("unexpected forced boot mode = %x\n", forced_mode);
 		break;
 	}

 	/* clear TAMP for next reboot */
 	clrsetbits_le32(TAMP_BOOT_CONTEXT, TAMP_BOOT_FORCED_MASK, BOOT_NORMAL);
 }

 /*
  * If there is no MAC address in the environment, then it will be initialized
  * (silently) from the value in the OTP.
  */
 __weak int setup_mac_address(void)
 {
 	int ret;
 	int i;
 	u32 otp[2];
 	uchar enetaddr[6];
 	struct udevice *dev;

 	if (!IS_ENABLED(CONFIG_NET))
 		return 0;

 	/* MAC already in environment */
 	if (eth_env_get_enetaddr("ethaddr", enetaddr))
 		return 0;

 	ret = uclass_get_device_by_driver(UCLASS_MISC,
 					  DM_DRIVER_GET(stm32mp_bsec),
 					  &dev);
 	if (ret)
 		return ret;

 	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_MAC),
 			otp, sizeof(otp));
 	if (ret < 0)
 		return ret;

 	for (i = 0; i < 6; i++)
 		enetaddr[i] = ((uint8_t *)&otp)[i];

 	if (!is_valid_ethaddr(enetaddr)) {
 		log_err("invalid MAC address in OTP %pM\n", enetaddr);
 		return -EINVAL;
 	}
 	log_debug("OTP MAC address = %pM\n", enetaddr);
 	ret = eth_env_set_enetaddr("ethaddr", enetaddr);
 	if (ret)
 		log_err("Failed to set mac address %pM from OTP: %d\n", enetaddr, ret);

 	return 0;
 }

 static int setup_serial_number(void)
 {
 	char serial_string[25];
 	u32 otp[3] = {0, 0, 0 };
 	struct udevice *dev;
 	int ret;

 	if (env_get("serial#"))
 		return 0;

 	ret = uclass_get_device_by_driver(UCLASS_MISC,
 					  DM_DRIVER_GET(stm32mp_bsec),
 					  &dev);
 	if (ret)
 		return ret;

 	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_SERIAL),
 			otp, sizeof(otp));
 	if (ret < 0)
 		return ret;

 	sprintf(serial_string, "%08X%08X%08X", otp[0], otp[1], otp[2]);
 	env_set("serial#", serial_string);

 	return 0;
 }

 static void setup_soc_type_pkg_rev(void)
 {
 	unsigned int type, pkg, rev;

 	get_cpu_string_offsets(&type, &pkg, &rev);

 	env_set("soc_type", soc_type[type]);
 	env_set("soc_pkg", soc_pkg[pkg]);
 	env_set("soc_rev", soc_rev[rev]);
 }

 int arch_misc_init(void)
 {
 	setup_boot_mode();
 	setup_mac_address();
 	setup_serial_number();
 	setup_soc_type_pkg_rev();

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
	/*
	* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
	*/

	#define LOG_CATEGORY LOGC_ARCH

	#include <common.h>
	#include <clk.h>
	#include <cpu_func.h>
	#include <debug_uart.h>
	#include <env.h>
	#include <init.h>
	#include <log.h>
	#include <lmb.h>
	#include <misc.h>
	#include <net.h>
	#include <asm/io.h>
	#include <asm/arch/bsec.h>
	#include <asm/arch/stm32.h>
	#include <asm/arch/sys_proto.h>
	#include <asm/global_data.h>
	#include <dm/device.h>
	#include <dm/uclass.h>
	#include <linux/bitops.h>

	/* RCC register */
	#define RCC_TZCR (STM32_RCC_BASE + 0x00)
	#define RCC_DBGCFGR (STM32_RCC_BASE + 0x080C)
	#define RCC_BDCR (STM32_RCC_BASE + 0x0140)
	#define RCC_MP_APB5ENSETR (STM32_RCC_BASE + 0x0208)
	#define RCC_MP_AHB5ENSETR (STM32_RCC_BASE + 0x0210)
	#define RCC_BDCR_VSWRST BIT(31)
	#define RCC_BDCR_RTCSRC GENMASK(17, 16)
	#define RCC_DBGCFGR_DBGCKEN BIT(8)

	/* Security register */
	#define ETZPC_TZMA1_SIZE (STM32_ETZPC_BASE + 0x04)
	#define ETZPC_DECPROT0 (STM32_ETZPC_BASE + 0x10)

	#define TZC_GATE_KEEPER (STM32_TZC_BASE + 0x008)
	#define TZC_REGION_ATTRIBUTE0 (STM32_TZC_BASE + 0x110)
	#define TZC_REGION_ID_ACCESS0 (STM32_TZC_BASE + 0x114)

	#define TAMP_CR1 (STM32_TAMP_BASE + 0x00)

	#define PWR_CR1 (STM32_PWR_BASE + 0x00)
	#define PWR_MCUCR (STM32_PWR_BASE + 0x14)
	#define PWR_CR1_DBP BIT(8)
	#define PWR_MCUCR_SBF BIT(6)

	/* DBGMCU register */
	#define DBGMCU_IDC (STM32_DBGMCU_BASE + 0x00)
	#define DBGMCU_APB4FZ1 (STM32_DBGMCU_BASE + 0x2C)
	#define DBGMCU_APB4FZ1_IWDG2 BIT(2)
	#define DBGMCU_IDC_DEV_ID_MASK GENMASK(11, 0)
	#define DBGMCU_IDC_DEV_ID_SHIFT 0
	#define DBGMCU_IDC_REV_ID_MASK GENMASK(31, 16)
	#define DBGMCU_IDC_REV_ID_SHIFT 16

	/* GPIOZ registers */
	#define GPIOZ_SECCFGR 0x54004030

	/* boot interface from Bootrom
	* - boot instance = bit 31:16
	* - boot device = bit 15:0
	*/
	#define BOOTROM_PARAM_ADDR 0x2FFC0078
	#define BOOTROM_MODE_MASK GENMASK(15, 0)
	#define BOOTROM_MODE_SHIFT 0
	#define BOOTROM_INSTANCE_MASK GENMASK(31, 16)
	#define BOOTROM_INSTANCE_SHIFT 16

	/* Device Part Number (RPN) = OTP_DATA1 lower 8 bits */
	#define RPN_SHIFT 0
	#define RPN_MASK GENMASK(7, 0)

	/* Package = bit 27:29 of OTP16
	* - 100: LBGA448 (FFI) => AA = LFBGA 18x18mm 448 balls p. 0.8mm
	* - 011: LBGA354 (LCI) => AB = LFBGA 16x16mm 359 balls p. 0.8mm
	* - 010: TFBGA361 (FFC) => AC = TFBGA 12x12mm 361 balls p. 0.5mm
	* - 001: TFBGA257 (LCC) => AD = TFBGA 10x10mm 257 balls p. 0.5mm
	* - others: Reserved
	*/
	#define PKG_SHIFT 27
	#define PKG_MASK GENMASK(2, 0)

	/*
	* early TLB into the .data section so that it not get cleared
	* with 16kB allignment (see TTBR0_BASE_ADDR_MASK)
	*/
	u8 early_tlb[PGTABLE_SIZE] __section(".data") __aligned(0x4000);

	struct lmb lmb;

	static void security_init(void)
	{
	/* Disable the backup domain write protection */
	/* the protection is enable at each reset by hardware */
	/* And must be disable by software */
	setbits_le32(PWR_CR1, PWR_CR1_DBP);

	while (!(readl(PWR_CR1) & PWR_CR1_DBP))
	;

	/* If RTC clock isn't enable so this is a cold boot then we need
	* to reset the backup domain
	*/
	if (!(readl(RCC_BDCR) & RCC_BDCR_RTCSRC)) {
	setbits_le32(RCC_BDCR, RCC_BDCR_VSWRST);
	while (!(readl(RCC_BDCR) & RCC_BDCR_VSWRST))
	;
	clrbits_le32(RCC_BDCR, RCC_BDCR_VSWRST);
	}

	/* allow non secure access in Write/Read for all peripheral */
	writel(GENMASK(25, 0), ETZPC_DECPROT0);

	/* Open SYSRAM for no secure access */
	writel(0x0, ETZPC_TZMA1_SIZE);

	/* enable TZC1 TZC2 clock */
	writel(BIT(11) \| BIT(12), RCC_MP_APB5ENSETR);

	/* Region 0 set to no access by default */
	/* bit 0 / 16 => nsaid0 read/write Enable
	* bit 1 / 17 => nsaid1 read/write Enable
	* ...
	* bit 15 / 31 => nsaid15 read/write Enable
	*/
	writel(0xFFFFFFFF, TZC_REGION_ID_ACCESS0);
	/* bit 30 / 31 => Secure Global Enable : write/read */
	/* bit 0 / 1 => Region Enable for filter 0/1 */
	writel(BIT(0) \| BIT(1) \| BIT(30) \| BIT(31), TZC_REGION_ATTRIBUTE0);

	/* Enable Filter 0 and 1 */
	setbits_le32(TZC_GATE_KEEPER, BIT(0) \| BIT(1));

	/* RCC trust zone deactivated */
	writel(0x0, RCC_TZCR);

	/* TAMP: deactivate the internal tamper
	* Bit 23 ITAMP8E: monotonic counter overflow
	* Bit 20 ITAMP5E: RTC calendar overflow
	* Bit 19 ITAMP4E: HSE monitoring
	* Bit 18 ITAMP3E: LSE monitoring
	* Bit 16 ITAMP1E: RTC power domain supply monitoring
	*/
	writel(0x0, TAMP_CR1);

	/* GPIOZ: deactivate the security */
	writel(BIT(0), RCC_MP_AHB5ENSETR);
	writel(0x0, GPIOZ_SECCFGR);
	}

	/*
	* Debug init
	*/
	static void dbgmcu_init(void)
	{
	/*
	* Freeze IWDG2 if Cortex-A7 is in debug mode
	* done in TF-A for TRUSTED boot and
	* DBGMCU access is controlled by BSEC_DENABLE.DBGSWENABLE
	*/
	if (bsec_dbgswenable()) {
	setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN);
	setbits_le32(DBGMCU_APB4FZ1, DBGMCU_APB4FZ1_IWDG2);
	}
	}

	void spl_board_init(void)
	{
	struct udevice *dev;
	int ret;

	dbgmcu_init();

	/* force probe of BSEC driver to shadow the upper OTP */
	ret = uclass_get_device_by_driver(UCLASS_MISC, DM_DRIVER_GET(stm32mp_bsec), &dev);
	if (ret)
	log_warning("BSEC probe failed: %d\n", ret);
	}

	/* get bootmode from ROM code boot context: saved in TAMP register */
	static void update_bootmode(void)
	{
	u32 boot_mode;
	u32 bootrom_itf = readl(BOOTROM_PARAM_ADDR);
	u32 bootrom_device, bootrom_instance;

	/* enable TAMP clock = RTCAPBEN */
	writel(BIT(8), RCC_MP_APB5ENSETR);

	/* read bootrom context */
	bootrom_device =
	(bootrom_itf & BOOTROM_MODE_MASK) >> BOOTROM_MODE_SHIFT;
	bootrom_instance =
	(bootrom_itf & BOOTROM_INSTANCE_MASK) >> BOOTROM_INSTANCE_SHIFT;
	boot_mode =
	((bootrom_device << BOOT_TYPE_SHIFT) & BOOT_TYPE_MASK) \|
	((bootrom_instance << BOOT_INSTANCE_SHIFT) &
	BOOT_INSTANCE_MASK);

	/* save the boot mode in TAMP backup register */
	clrsetbits_le32(TAMP_BOOT_CONTEXT,
	TAMP_BOOT_MODE_MASK,
	boot_mode << TAMP_BOOT_MODE_SHIFT);
	}

	u32 get_bootmode(void)
	{
	/* read bootmode from TAMP backup register */
	return (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_MODE_MASK) >>
	TAMP_BOOT_MODE_SHIFT;
	}

	/*
	* weak function overidde: set the DDR/SYSRAM executable before to enable the
	* MMU and configure DACR, for early early_enable_caches (SPL or pre-reloc)
	*/
	void dram_bank_mmu_setup(int bank)
	{
	struct bd_info *bd = gd->bd;
	int i;
	phys_addr_t start;
	phys_size_t size;
	bool use_lmb = false;
	enum dcache_option option;

	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
	start = ALIGN_DOWN(STM32_SYSRAM_BASE, MMU_SECTION_SIZE);
	size = ALIGN(STM32_SYSRAM_SIZE, MMU_SECTION_SIZE);
	} else if (gd->flags & GD_FLG_RELOC) {
	/* bd->bi_dram is available only after relocation */
	start = bd->bi_dram[bank].start;
	size = bd->bi_dram[bank].size;
	use_lmb = true;
	} else {
	/* mark cacheable and executable the beggining of the DDR */
	start = STM32_DDR_BASE;
	size = CONFIG_DDR_CACHEABLE_SIZE;
	}

	for (i = start >> MMU_SECTION_SHIFT;
	i < (start >> MMU_SECTION_SHIFT) + (size >> MMU_SECTION_SHIFT);
	i++) {
	option = DCACHE_DEFAULT_OPTION;
	if (use_lmb && lmb_is_reserved_flags(&lmb, i << MMU_SECTION_SHIFT, LMB_NOMAP))
	option = 0; /* INVALID ENTRY in TLB */
	set_section_dcache(i, option);
	}
	}
	/*
	* initialize the MMU and activate cache in SPL or in U-Boot pre-reloc stage
	* MMU/TLB is updated in enable_caches() for U-Boot after relocation
	* or is deactivated in U-Boot entry function start.S::cpu_init_cp15
	*/
	static void early_enable_caches(void)
	{
	/* I-cache is already enabled in start.S: cpu_init_cp15 */

	if (CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
	return;

	if (!(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))) {
	gd->arch.tlb_size = PGTABLE_SIZE;
	gd->arch.tlb_addr = (unsigned long)&early_tlb;
	}

	/* enable MMU (default configuration) */
	dcache_enable();
	}

	/*
	* Early system init
	*/
	int arch_cpu_init(void)
	{
	u32 boot_mode;

	early_enable_caches();

	/* early armv7 timer init: needed for polling */
	timer_init();

	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
	security_init();
	update_bootmode();
	}
	/* reset copro state in SPL, when used, or in U-Boot */
	if (!IS_ENABLED(CONFIG_SPL) \|\| IS_ENABLED(CONFIG_SPL_BUILD)) {
	/* Reset Coprocessor state unless it wakes up from Standby power mode */
	if (!(readl(PWR_MCUCR) & PWR_MCUCR_SBF)) {
	writel(TAMP_COPRO_STATE_OFF, TAMP_COPRO_STATE);
	writel(0, TAMP_COPRO_RSC_TBL_ADDRESS);
	}
	}

	boot_mode = get_bootmode();

	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) &&
	(boot_mode & TAMP_BOOT_DEVICE_MASK) == BOOT_SERIAL_UART)
	gd->flags \|= GD_FLG_SILENT \| GD_FLG_DISABLE_CONSOLE;
	else if (IS_ENABLED(CONFIG_DEBUG_UART) && IS_ENABLED(CONFIG_SPL_BUILD))
	debug_uart_init();

	return 0;
	}

	void enable_caches(void)
	{
	/* parse device tree when data cache is still activated */
	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);

	/* I-cache is already enabled in start.S: icache_enable() not needed */

	/* deactivate the data cache, early enabled in arch_cpu_init() */
	dcache_disable();
	/*
	* update MMU after relocation and enable the data cache
	* warning: the TLB location udpated in board_f.c::reserve_mmu
	*/
	dcache_enable();
	}

	static u32 read_idc(void)
	{
	/* DBGMCU access is controlled by BSEC_DENABLE.DBGSWENABLE */
	if (bsec_dbgswenable()) {
	setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN);

	return readl(DBGMCU_IDC);
	}

	if (CONFIG_IS_ENABLED(STM32MP15x))
	return CPU_DEV_STM32MP15; /* STM32MP15x and unknown revision */
	else
	return 0x0;
	}

	u32 get_cpu_dev(void)
	{
	return (read_idc() & DBGMCU_IDC_DEV_ID_MASK) >> DBGMCU_IDC_DEV_ID_SHIFT;
	}

	u32 get_cpu_rev(void)
	{
	return (read_idc() & DBGMCU_IDC_REV_ID_MASK) >> DBGMCU_IDC_REV_ID_SHIFT;
	}

	static u32 get_otp(int index, int shift, int mask)
	{
	int ret;
	struct udevice *dev;
	u32 otp = 0;

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

	if (!ret)
	ret = misc_read(dev, STM32_BSEC_SHADOW(index),
	&otp, sizeof(otp));

	return (otp >> shift) & mask;
	}

	/* Get Device Part Number (RPN) from OTP */
	static u32 get_cpu_rpn(void)
	{
	return get_otp(BSEC_OTP_RPN, RPN_SHIFT, RPN_MASK);
	}

	u32 get_cpu_type(void)
	{
	return (get_cpu_dev() << 16) \| get_cpu_rpn();
	}

	/* Get Package options from OTP */
	u32 get_cpu_package(void)
	{
	return get_otp(BSEC_OTP_PKG, PKG_SHIFT, PKG_MASK);
	}

	static const char * const soc_type[] = {
	"????",
	"151C", "151A", "151F", "151D",
	"153C", "153A", "153F", "153D",
	"157C", "157A", "157F", "157D"
	};

	static const char * const soc_pkg[] = { "??", "AD", "AC", "AB", "AA" };
	static const char * const soc_rev[] = { "?", "A", "B", "Z" };

	static void get_cpu_string_offsets(unsigned int type, unsigned int pkg,
	unsigned int *rev)
	{
	u32 cpu_type = get_cpu_type();
	u32 ct = cpu_type & ~(BIT(7) \| BIT(0));
	u32 cm = ((cpu_type & BIT(7)) >> 6) \| (cpu_type & BIT(0));
	u32 cp = get_cpu_package();

	/* Bits 0 and 7 are the ACDF, 00:C 01:A 10:F 11:D */
	switch (ct) {
	case CPU_STM32MP151Cxx:
	*type = cm + 1;
	break;
	case CPU_STM32MP153Cxx:
	*type = cm + 5;
	break;
	case CPU_STM32MP157Cxx:
	*type = cm + 9;
	break;
	default:
	*type = 0;
	break;
	}

	/* Package */
	switch (cp) {
	case PKG_AA_LBGA448:
	case PKG_AB_LBGA354:
	case PKG_AC_TFBGA361:
	case PKG_AD_TFBGA257:
	*pkg = cp;
	break;
	default:
	*pkg = 0;
	break;
	}

	/* Revision */
	switch (get_cpu_rev()) {
	case CPU_REV1:
	*rev = 1;
	break;
	case CPU_REV2:
	*rev = 2;
	break;
	case CPU_REV2_1:
	*rev = 3;
	break;
	default:
	*rev = 0;
	break;
	}
	}

	void get_soc_name(char name[SOC_NAME_SIZE])
	{
	unsigned int type, pkg, rev;

	get_cpu_string_offsets(&type, &pkg, &rev);

	snprintf(name, SOC_NAME_SIZE, "STM32MP%s%s Rev.%s",
	soc_type[type], soc_pkg[pkg], soc_rev[rev]);
	}

	/* used when CONFIG_DISPLAY_CPUINFO is activated */
	int print_cpuinfo(void)
	{
	char name[SOC_NAME_SIZE];

	get_soc_name(name);
	printf("CPU: %s\n", name);

	return 0;
	}

	static void setup_boot_mode(void)
	{
	const u32 serial_addr[] = {
	STM32_USART1_BASE,
	STM32_USART2_BASE,
	STM32_USART3_BASE,
	STM32_UART4_BASE,
	STM32_UART5_BASE,
	STM32_USART6_BASE,
	STM32_UART7_BASE,
	STM32_UART8_BASE
	};
	const u32 sdmmc_addr[] = {
	STM32_SDMMC1_BASE,
	STM32_SDMMC2_BASE,
	STM32_SDMMC3_BASE
	};
	char cmd[60];
	u32 boot_ctx = readl(TAMP_BOOT_CONTEXT);
	u32 boot_mode =
	(boot_ctx & TAMP_BOOT_MODE_MASK) >> TAMP_BOOT_MODE_SHIFT;
	unsigned int instance = (boot_mode & TAMP_BOOT_INSTANCE_MASK) - 1;
	u32 forced_mode = (boot_ctx & TAMP_BOOT_FORCED_MASK);
	struct udevice *dev;

	log_debug("%s: boot_ctx=0x%x => boot_mode=%x, instance=%d forced=%x\n",
	__func__, boot_ctx, boot_mode, instance, forced_mode);
	switch (boot_mode & TAMP_BOOT_DEVICE_MASK) {
	case BOOT_SERIAL_UART:
	if (instance > ARRAY_SIZE(serial_addr))
	break;
	/* serial : search associated node in devicetree */
	sprintf(cmd, "serial@%x", serial_addr[instance]);
	if (uclass_get_device_by_name(UCLASS_SERIAL, cmd, &dev)) {
	/* restore console on error */
	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL))
	gd->flags &= ~(GD_FLG_SILENT \|
	GD_FLG_DISABLE_CONSOLE);
	log_err("uart%d = %s not found in device tree!\n",
	instance + 1, cmd);
	break;
	}
	sprintf(cmd, "%d", dev_seq(dev));
	env_set("boot_device", "serial");
	env_set("boot_instance", cmd);

	/* restore console on uart when not used */
	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) && gd->cur_serial_dev != dev) {
	gd->flags &= ~(GD_FLG_SILENT \|
	GD_FLG_DISABLE_CONSOLE);
	log_info("serial boot with console enabled!\n");
	}
	break;
	case BOOT_SERIAL_USB:
	env_set("boot_device", "usb");
	env_set("boot_instance", "0");
	break;
	case BOOT_FLASH_SD:
	case BOOT_FLASH_EMMC:
	if (instance > ARRAY_SIZE(sdmmc_addr))
	break;
	/* search associated sdmmc node in devicetree */
	sprintf(cmd, "mmc@%x", sdmmc_addr[instance]);
	if (uclass_get_device_by_name(UCLASS_MMC, cmd, &dev)) {
	printf("mmc%d = %s not found in device tree!\n",
	instance, cmd);
	break;
	}
	sprintf(cmd, "%d", dev_seq(dev));
	env_set("boot_device", "mmc");
	env_set("boot_instance", cmd);
	break;
	case BOOT_FLASH_NAND:
	env_set("boot_device", "nand");
	env_set("boot_instance", "0");
	break;
	case BOOT_FLASH_SPINAND:
	env_set("boot_device", "spi-nand");
	env_set("boot_instance", "0");
	break;
	case BOOT_FLASH_NOR:
	env_set("boot_device", "nor");
	env_set("boot_instance", "0");
	break;
	default:
	env_set("boot_device", "invalid");
	env_set("boot_instance", "");
	log_err("unexpected boot mode = %x\n", boot_mode);
	break;
	}

	switch (forced_mode) {
	case BOOT_FASTBOOT:
	log_info("Enter fastboot!\n");
	env_set("preboot", "env set preboot; fastboot 0");
	break;
	case BOOT_STM32PROG:
	env_set("boot_device", "usb");
	env_set("boot_instance", "0");
	break;
	case BOOT_UMS_MMC0:
	case BOOT_UMS_MMC1:
	case BOOT_UMS_MMC2:
	log_info("Enter UMS!\n");
	instance = forced_mode - BOOT_UMS_MMC0;
	sprintf(cmd, "env set preboot; ums 0 mmc %d", instance);
	env_set("preboot", cmd);
	break;
	case BOOT_RECOVERY:
	env_set("preboot", "env set preboot; run altbootcmd");
	break;
	case BOOT_NORMAL:
	break;
	default:
	log_debug("unexpected forced boot mode = %x\n", forced_mode);
	break;
	}

	/* clear TAMP for next reboot */
	clrsetbits_le32(TAMP_BOOT_CONTEXT, TAMP_BOOT_FORCED_MASK, BOOT_NORMAL);
	}

	/*
	* If there is no MAC address in the environment, then it will be initialized
	* (silently) from the value in the OTP.
	*/
	__weak int setup_mac_address(void)
	{
	int ret;
	int i;
	u32 otp[2];
	uchar enetaddr[6];
	struct udevice *dev;

	if (!IS_ENABLED(CONFIG_NET))
	return 0;

	/* MAC already in environment */
	if (eth_env_get_enetaddr("ethaddr", enetaddr))
	return 0;

	ret = uclass_get_device_by_driver(UCLASS_MISC,
	DM_DRIVER_GET(stm32mp_bsec),
	&dev);
	if (ret)
	return ret;

	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_MAC),
	otp, sizeof(otp));
	if (ret < 0)
	return ret;

	for (i = 0; i < 6; i++)
	enetaddr[i] = ((uint8_t *)&otp)[i];

	if (!is_valid_ethaddr(enetaddr)) {
	log_err("invalid MAC address in OTP %pM\n", enetaddr);
	return -EINVAL;
	}
	log_debug("OTP MAC address = %pM\n", enetaddr);
	ret = eth_env_set_enetaddr("ethaddr", enetaddr);
	if (ret)
	log_err("Failed to set mac address %pM from OTP: %d\n", enetaddr, ret);

	return 0;
	}

	static int setup_serial_number(void)
	{
	char serial_string[25];
	u32 otp[3] = {0, 0, 0 };
	struct udevice *dev;
	int ret;

	if (env_get("serial#"))
	return 0;

	ret = uclass_get_device_by_driver(UCLASS_MISC,
	DM_DRIVER_GET(stm32mp_bsec),
	&dev);
	if (ret)
	return ret;

	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_SERIAL),
	otp, sizeof(otp));
	if (ret < 0)
	return ret;

	sprintf(serial_string, "%08X%08X%08X", otp[0], otp[1], otp[2]);
	env_set("serial#", serial_string);

	return 0;
	}

	static void setup_soc_type_pkg_rev(void)
	{
	unsigned int type, pkg, rev;

	get_cpu_string_offsets(&type, &pkg, &rev);

	env_set("soc_type", soc_type[type]);
	env_set("soc_pkg", soc_pkg[pkg]);
	env_set("soc_rev", soc_rev[rev]);
	}

	int arch_misc_init(void)
	{
	setup_boot_mode();
	setup_mac_address();
	setup_serial_number();
	setup_soc_type_pkg_rev();

	return 0;
	}