plat/st/stm32mp2/bl2_plat_setup.c

/*
 * Copyright (c) 2023-2024, STMicroelectronics - All Rights Reserved
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <cdefs.h>
#include <errno.h>
#include <stdint.h>

#include <common/debug.h>
#include <common/desc_image_load.h>
#include <drivers/clk.h>
#include <drivers/mmc.h>
#include <drivers/st/regulator_fixed.h>
#include <drivers/st/stm32mp2_ddr_helpers.h>
#include <drivers/st/stm32mp2_ram.h>
#include <drivers/st/stm32mp_pmic2.h>
#include <drivers/st/stm32mp_risab_regs.h>
#include <lib/fconf/fconf.h>
#include <lib/fconf/fconf_dyn_cfg_getter.h>
#include <lib/mmio.h>
#include <lib/optee_utils.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
#include <plat/common/platform.h>

#include <platform_def.h>
#include <stm32mp_common.h>
#include <stm32mp_dt.h>

#define BOOT_CTX_ADDR	0x0e000020UL

static void print_reset_reason(void)
{
	uint32_t rstsr = mmio_read_32(stm32mp_rcc_base() + RCC_C1BOOTRSTSCLRR);
	const char *reason_str = "Unidentified";

#if !STM32MP21
	if ((rstsr & RCC_C1BOOTRSTSCLRR_C1P1RSTF) != 0U) {
		INFO("CA35 processor core 1 reset\n");
	}
#endif /* !STM32MP21 */

	if ((rstsr & RCC_C1BOOTRSTSCLRR_PADRSTF) == 0U) {
		if ((rstsr & RCC_C1BOOTRSTSCLRR_STBYC1RSTF) != 0U) {
			reason_str = "System exits from Standby for CA35";
		} else if ((rstsr & RCC_C1BOOTRSTSCLRR_D1STBYRSTF) != 0U) {
			reason_str = "D1 domain exits from DStandby";
		} else if ((rstsr & RCC_C1BOOTRSTSCLRR_VCPURSTF) != 0U) {
			reason_str = "System reset from VCPU monitor";
		} else if ((rstsr & RCC_C1BOOTRSTSCLRR_C1RSTF) != 0U) {
			reason_str = "CA35 reset by CM33 (C1RST)";
		} else {
			reason_str = "Unidentified";
		}
	} else {
		if ((rstsr & RCC_C1BOOTRSTSCLRR_PORRSTF) != 0U) {
			reason_str = "Power-on reset (por_rstn)";
		} else if ((rstsr & RCC_C1BOOTRSTSCLRR_BORRSTF) != 0U) {
			reason_str = "Brownout reset (bor_rstn)";
		} else if ((rstsr & (RCC_C1BOOTRSTSSETR_SYSC2RSTF |
				     RCC_C1BOOTRSTSSETR_SYSC1RSTF)) != 0U) {
			reason_str = "System reset (SYSRST)";
		} else if ((rstsr & RCC_C1BOOTRSTSCLRR_HCSSRSTF) != 0U) {
			reason_str = "Clock failure on HSE";
		} else if ((rstsr & RCC_C1BOOTRSTSCLRR_IWDGXSYSRSTF) != 0U) {
			reason_str = "IWDG system reset (iwdgX_out_rst)";
		} else if ((rstsr & RCC_C1BOOTRSTSCLRR_PADRSTF) != 0U) {
			reason_str = "Pin reset from NRST";
		} else {
			reason_str = "Unidentified";
		}
	}

	INFO("Reset reason: %s (0x%x)\n", reason_str, rstsr);
}

void bl2_el3_early_platform_setup(u_register_t arg0 __unused,
				  u_register_t arg1 __unused,
				  u_register_t arg2 __unused,
				  u_register_t arg3 __unused)
{
	stm32mp_save_boot_ctx_address(BOOT_CTX_ADDR);
}

void bl2_platform_setup(void)
{
	int ret;

	ret = stm32mp2_ddr_probe();
	if (ret != 0) {
		ERROR("DDR probe: error %d\n", ret);
		panic();
	}

	/* Map DDR for binary load, now with cacheable attribute */
	ret = mmap_add_dynamic_region(STM32MP_DDR_BASE, STM32MP_DDR_BASE,
				      STM32MP_DDR_MAX_SIZE, MT_MEMORY | MT_RW | MT_SECURE);
	if (ret < 0) {
		ERROR("DDR mapping: error %d\n", ret);
		panic();
	}
}

static void reset_backup_domain(void)
{
	uintptr_t pwr_base = stm32mp_pwr_base();
	uintptr_t rcc_base = stm32mp_rcc_base();

	/*
	 * Disable the backup domain write protection.
	 * The protection is enable at each reset by hardware
	 * and must be disabled by software.
	 */
#if STM32MP21
	mmio_setbits_32(pwr_base + PWR_BDCR, PWR_BDCR_DBP);

	while ((mmio_read_32(pwr_base + PWR_BDCR) & PWR_BDCR_DBP) == 0U) {
		;
	}
#else /* STM32MP21 */
	mmio_setbits_32(pwr_base + PWR_BDCR1, PWR_BDCR1_DBD3P);

	while ((mmio_read_32(pwr_base + PWR_BDCR1) & PWR_BDCR1_DBD3P) == 0U) {
		;
	}
#endif /* STM32MP21 */

	/* Reset backup domain on cold boot cases */
	if ((mmio_read_32(rcc_base + RCC_BDCR) & RCC_BDCR_RTCCKEN) == 0U) {
		mmio_setbits_32(rcc_base + RCC_BDCR, RCC_BDCR_VSWRST);

		while ((mmio_read_32(rcc_base + RCC_BDCR) & RCC_BDCR_VSWRST) == 0U) {
			;
		}

		mmio_clrbits_32(rcc_base + RCC_BDCR, RCC_BDCR_VSWRST);
	}
}

void bl2_el3_plat_arch_setup(void)
{
	const char *board_model;
	boot_api_context_t *boot_context =
		(boot_api_context_t *)stm32mp_get_boot_ctx_address();

	if (stm32_otp_probe() != 0U) {
		EARLY_ERROR("OTP probe failed\n");
		panic();
	}

	mmap_add_region(BL_CODE_BASE, BL_CODE_BASE,
			BL_CODE_END - BL_CODE_BASE,
			MT_CODE | MT_SECURE);

	configure_mmu();

	if (dt_open_and_check(STM32MP_DTB_BASE) < 0) {
		panic();
	}

	reset_backup_domain();

	/*
	 * Initialize DDR sub-system clock. This needs to be done before enabling DDR PLL (PLL2),
	 * and so before stm32mp2_clk_init().
	 */
	ddr_sub_system_clk_init();

	if (stm32mp2_clk_init() < 0) {
		panic();
	}

#if STM32MP_DDR_FIP_IO_STORAGE
	/*
	 * RISAB3 setup (dedicated for SRAM1)
	 *
	 * Allow secure read/writes data accesses to non-secure
	 * blocks or pages, all RISAB registers are writable.
	 * DDR firmwares are saved there before being loaded in DDRPHY memory.
	 */
	mmio_write_32(RISAB3_BASE + RISAB_CR, RISAB_CR_SRWIAD);
#endif

	stm32_save_boot_info(boot_context);

	if (stm32mp_uart_console_setup() != 0) {
		goto skip_console_init;
	}

	stm32mp_print_cpuinfo();

	board_model = dt_get_board_model();
	if (board_model != NULL) {
		NOTICE("Model: %s\n", board_model);
	}

	stm32mp_print_boardinfo();

	print_reset_reason();

skip_console_init:
	if (fixed_regulator_register() != 0) {
		panic();
	}

	if (dt_pmic_status() > 0) {
		initialize_pmic();
	}

	fconf_populate("TB_FW", STM32MP_DTB_BASE);

	/*
	 * RISAB5 setup (dedicated for RETRAM)
	 *
	 * Allow secure read/writes data accesses to non-secure
	 * blocks or pages, all RISAB registers are writable.
	 * DDR retention registers are saved there and restored
	 * when exiting standby low power state.
	 */
	mmio_write_32(RISAB5_BASE + RISAB_CR, RISAB_CR_SRWIAD);

	stm32mp_io_setup();
}

/*******************************************************************************
 * This function can be used by the platforms to update/use image
 * information for given `image_id`.
 ******************************************************************************/
int bl2_plat_handle_post_image_load(unsigned int image_id)
{
	int err = 0;
	bl_mem_params_node_t *bl_mem_params = get_bl_mem_params_node(image_id);
	bl_mem_params_node_t *pager_mem_params;
	const struct dyn_cfg_dtb_info_t *config_info;
	unsigned int i;
	const unsigned int image_ids[] = {
		BL31_IMAGE_ID,
		SOC_FW_CONFIG_ID,
		BL32_IMAGE_ID,
		BL33_IMAGE_ID,
		HW_CONFIG_ID,
	};

	assert(bl_mem_params != NULL);

#if STM32MP_SDMMC || STM32MP_EMMC
	/*
	 * Invalidate remaining data read from MMC but not flushed by load_image_flush().
	 * We take the worst case which is 2 MMC blocks.
	 */
	if ((image_id != FW_CONFIG_ID) &&
	    ((bl_mem_params->image_info.h.attr & IMAGE_ATTRIB_SKIP_LOADING) == 0U)) {
		inv_dcache_range(bl_mem_params->image_info.image_base +
				 bl_mem_params->image_info.image_size,
				 2U * MMC_BLOCK_SIZE);
	}
#endif /* STM32MP_SDMMC || STM32MP_EMMC */

	switch (image_id) {
	case FW_CONFIG_ID:
		/* Set global DTB info for fixed fw_config information */
		set_config_info(STM32MP_FW_CONFIG_BASE, ~0UL, STM32MP_FW_CONFIG_MAX_SIZE,
				FW_CONFIG_ID);
		fconf_populate("FW_CONFIG", STM32MP_FW_CONFIG_BASE);

		/* Iterate through all the fw config IDs */
		for (i = 0U; i < ARRAY_SIZE(image_ids); i++) {
			bl_mem_params = get_bl_mem_params_node(image_ids[i]);
			assert(bl_mem_params != NULL);

			config_info = FCONF_GET_PROPERTY(dyn_cfg, dtb, image_ids[i]);
			if (config_info == NULL) {
				continue;
			}

			bl_mem_params->image_info.image_base = config_info->config_addr;
			bl_mem_params->image_info.image_max_size = config_info->config_max_size;

			bl_mem_params->image_info.h.attr &= ~IMAGE_ATTRIB_SKIP_LOADING;

			switch (image_ids[i]) {
			case BL31_IMAGE_ID:
				bl_mem_params->ep_info.pc = config_info->config_addr;
				break;

			case BL32_IMAGE_ID:
				bl_mem_params->ep_info.pc = config_info->config_addr;

				/* In case of OPTEE, initialize address space with tos_fw addr */
				pager_mem_params = get_bl_mem_params_node(BL32_EXTRA1_IMAGE_ID);
				if (pager_mem_params != NULL) {
					pager_mem_params->image_info.image_base =
						config_info->config_addr;
					pager_mem_params->image_info.image_max_size =
						config_info->config_max_size;
				}
				break;

			case BL33_IMAGE_ID:
				bl_mem_params->ep_info.pc = config_info->config_addr;
				break;

			case HW_CONFIG_ID:
			case SOC_FW_CONFIG_ID:
				break;

			default:
				return -EINVAL;
			}
		}

		/*
		 * After this step, the BL2 device tree area will be overwritten
		 * with BL31 binary, no other data should be read from BL2 DT.
		 */

		break;

	case BL32_IMAGE_ID:
		if ((bl_mem_params->image_info.image_base != 0UL) &&
		    (optee_header_is_valid(bl_mem_params->image_info.image_base))) {
			/* BL32 is OP-TEE header */
			bl_mem_params->ep_info.pc = bl_mem_params->image_info.image_base;
			pager_mem_params = get_bl_mem_params_node(BL32_EXTRA1_IMAGE_ID);
			assert(pager_mem_params != NULL);

			err = parse_optee_header(&bl_mem_params->ep_info,
						 &pager_mem_params->image_info,
						 NULL);
			if (err != 0) {
				ERROR("OPTEE header parse error.\n");
				panic();
			}

			/* Set optee boot info from parsed header data */
			bl_mem_params->ep_info.args.arg0 = 0U; /* Unused */
			bl_mem_params->ep_info.args.arg1 = 0U; /* Unused */
			bl_mem_params->ep_info.args.arg2 = 0U; /* No DT supported */
		}
		break;

	case BL33_IMAGE_ID:
#if PSA_FWU_SUPPORT
		stm32_fwu_set_boot_idx();
#endif /* PSA_FWU_SUPPORT */
		break;

	default:
		/* Do nothing in default case */
		break;
	}

	return err;
}