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Diffstat (limited to '')
| -rw-r--r-- | plat/st/stm32mp1/stm32mp1_syscfg.c | 413 |
1 files changed, 413 insertions, 0 deletions
diff --git a/plat/st/stm32mp1/stm32mp1_syscfg.c b/plat/st/stm32mp1/stm32mp1_syscfg.c new file mode 100644 index 0000000..75dd709 --- /dev/null +++ b/plat/st/stm32mp1/stm32mp1_syscfg.c @@ -0,0 +1,413 @@ +/* + * Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <errno.h> + +#include <common/debug.h> +#include <drivers/clk.h> +#include <drivers/delay_timer.h> +#include <drivers/st/stpmic1.h> +#include <lib/mmio.h> +#include <lib/utils_def.h> +#include <libfdt.h> + +#include <platform_def.h> +#include <stm32mp_common.h> +#include <stm32mp_dt.h> +#include <stm32mp1_private.h> + +/* + * SYSCFG REGISTER OFFSET (base relative) + */ +#define SYSCFG_BOOTR 0x00U +#define SYSCFG_BOOTCR 0x0CU +#if STM32MP15 +#define SYSCFG_IOCTRLSETR 0x18U +#define SYSCFG_ICNR 0x1CU +#endif +#define SYSCFG_CMPCR 0x20U +#define SYSCFG_CMPENSETR 0x24U +#define SYSCFG_CMPENCLRR 0x28U +#if STM32MP13 +#define SYSCFG_CMPSD1CR 0x30U +#define SYSCFG_CMPSD1ENSETR 0x34U +#define SYSCFG_CMPSD1ENCLRR 0x38U +#define SYSCFG_CMPSD2CR 0x40U +#define SYSCFG_CMPSD2ENSETR 0x44U +#define SYSCFG_CMPSD2ENCLRR 0x48U +#define SYSCFG_HSLVEN0R 0x50U +#endif +#define SYSCFG_IDC 0x380U + +#define CMPCR_CMPENSETR_OFFSET 0x4U +#define CMPCR_CMPENCLRR_OFFSET 0x8U + +/* + * SYSCFG_BOOTR Register + */ +#define SYSCFG_BOOTR_BOOT_MASK GENMASK(2, 0) +#if STM32MP15 +#define SYSCFG_BOOTR_BOOTPD_MASK GENMASK(6, 4) +#define SYSCFG_BOOTR_BOOTPD_SHIFT 4 +#endif + +/* + * SYSCFG_BOOTCR Register + */ +#define SYSCFG_BOOTCR_BMEN BIT(0) + +/* + * SYSCFG_IOCTRLSETR Register + */ +#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) + +/* + * SYSCFG_ICNR Register + */ +#define SYSCFG_ICNR_AXI_M9 BIT(9) + +/* + * SYSCFG_CMPCR Register + */ +#define SYSCFG_CMPCR_SW_CTRL BIT(1) +#define SYSCFG_CMPCR_READY BIT(8) +#define SYSCFG_CMPCR_RANSRC GENMASK(19, 16) +#define SYSCFG_CMPCR_RANSRC_SHIFT 16 +#define SYSCFG_CMPCR_RAPSRC GENMASK(23, 20) +#define SYSCFG_CMPCR_ANSRC_SHIFT 24 + +#define SYSCFG_CMPCR_READY_TIMEOUT_US 10000U + +/* + * SYSCFG_CMPENSETR Register + */ +#define SYSCFG_CMPENSETR_MPU_EN BIT(0) + +/* + * HSLV definitions + */ +#define HSLV_IDX_TPIU 0U +#define HSLV_IDX_QSPI 1U +#define HSLV_IDX_ETH1 2U +#define HSLV_IDX_ETH2 3U +#define HSLV_IDX_SDMMC1 4U +#define HSLV_IDX_SDMMC2 5U +#define HSLV_IDX_SPI1 6U +#define HSLV_IDX_SPI2 7U +#define HSLV_IDX_SPI3 8U +#define HSLV_IDX_SPI4 9U +#define HSLV_IDX_SPI5 10U +#define HSLV_IDX_LTDC 11U +#define HSLV_NB_IDX 12U + +#define HSLV_KEY 0x1018U + +/* + * SYSCFG_IDC Register + */ +#define SYSCFG_IDC_DEV_ID_MASK GENMASK(11, 0) +#define SYSCFG_IDC_REV_ID_MASK GENMASK(31, 16) +#define SYSCFG_IDC_REV_ID_SHIFT 16 + +static void enable_io_comp_cell_finish(uintptr_t cmpcr_off) +{ + uint64_t start; + + start = timeout_init_us(SYSCFG_CMPCR_READY_TIMEOUT_US); + + while ((mmio_read_32(SYSCFG_BASE + cmpcr_off) & SYSCFG_CMPCR_READY) == 0U) { + if (timeout_elapsed(start)) { + /* Failure on IO compensation enable is not a issue: warn only. */ + WARN("IO compensation cell not ready\n"); + break; + } + } + + mmio_clrbits_32(SYSCFG_BASE + cmpcr_off, SYSCFG_CMPCR_SW_CTRL); +} + +static void disable_io_comp_cell(uintptr_t cmpcr_off) +{ + uint32_t value; + + if (((mmio_read_32(SYSCFG_BASE + cmpcr_off) & SYSCFG_CMPCR_READY) == 0U) || + ((mmio_read_32(SYSCFG_BASE + cmpcr_off + CMPCR_CMPENSETR_OFFSET) & + SYSCFG_CMPENSETR_MPU_EN) == 0U)) { + return; + } + + value = mmio_read_32(SYSCFG_BASE + cmpcr_off) >> SYSCFG_CMPCR_ANSRC_SHIFT; + + mmio_clrbits_32(SYSCFG_BASE + cmpcr_off, SYSCFG_CMPCR_RANSRC | SYSCFG_CMPCR_RAPSRC); + + value <<= SYSCFG_CMPCR_RANSRC_SHIFT; + value |= mmio_read_32(SYSCFG_BASE + cmpcr_off); + + mmio_write_32(SYSCFG_BASE + cmpcr_off, value | SYSCFG_CMPCR_SW_CTRL); + + mmio_setbits_32(SYSCFG_BASE + cmpcr_off + CMPCR_CMPENCLRR_OFFSET, SYSCFG_CMPENSETR_MPU_EN); +} + +#if STM32MP13 +static int get_regu_max_voltage(void *fdt, int sdmmc_node, + const char *regu_name, uint32_t *regu_val) +{ + int node; + const fdt32_t *cuint; + + cuint = fdt_getprop(fdt, sdmmc_node, regu_name, NULL); + if (cuint == NULL) { + return -ENODEV; + } + + node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint)); + if (node < 0) { + return -ENODEV; + } + + cuint = fdt_getprop(fdt, node, "regulator-max-microvolt", NULL); + if (cuint == NULL) { + return -ENODEV; + } + + *regu_val = fdt32_to_cpu(*cuint); + + return 0; +} + +static bool sdmmc_is_low_voltage(uintptr_t sdmmc_base) +{ + int ret; + int node; + void *fdt = NULL; + uint32_t regu_max_val; + + if (fdt_get_address(&fdt) == 0) { + return false; + } + + if (fdt == NULL) { + return false; + } + + node = dt_match_instance_by_compatible(DT_SDMMC2_COMPAT, sdmmc_base); + if (node < 0) { + /* No SD or eMMC device on this instance, enable HSLV */ + return true; + } + + ret = get_regu_max_voltage(fdt, node, "vqmmc-supply", ®u_max_val); + if ((ret < 0) || (regu_max_val > 1800000U)) { + /* + * The vqmmc-supply property should always be present for eMMC. + * For SD-card, if it is not, then the card only supports 3.3V. + */ + return false; + } + + return true; +} + +static void enable_hslv_by_index(uint32_t index) +{ + bool apply_hslv; + + assert(index < HSLV_NB_IDX); + + switch (index) { + case HSLV_IDX_SDMMC1: + apply_hslv = sdmmc_is_low_voltage(STM32MP_SDMMC1_BASE); + break; + case HSLV_IDX_SDMMC2: + apply_hslv = sdmmc_is_low_voltage(STM32MP_SDMMC2_BASE); + break; + default: + apply_hslv = true; + break; + } + + if (apply_hslv) { + uint32_t reg_offset = index * sizeof(uint32_t); + + mmio_write_32(SYSCFG_BASE + SYSCFG_HSLVEN0R + reg_offset, HSLV_KEY); + } +} +#endif + +static void enable_high_speed_mode_low_voltage(void) +{ +#if STM32MP13 + uint32_t idx; + + for (idx = 0U; idx < HSLV_NB_IDX; idx++) { + enable_hslv_by_index(idx); + } +#endif +#if STM32MP15 + mmio_write_32(SYSCFG_BASE + SYSCFG_IOCTRLSETR, + SYSCFG_IOCTRLSETR_HSLVEN_TRACE | + SYSCFG_IOCTRLSETR_HSLVEN_QUADSPI | + SYSCFG_IOCTRLSETR_HSLVEN_ETH | + SYSCFG_IOCTRLSETR_HSLVEN_SDMMC | + SYSCFG_IOCTRLSETR_HSLVEN_SPI); +#endif +} + +static void stm32mp1_syscfg_set_hslv(void) +{ + uint32_t otp_value; + uint32_t vdd_voltage; + bool product_below_2v5; + + /* + * High Speed Low Voltage Pad mode Enable for SPI, SDMMC, ETH, QSPI + * and TRACE. Needed above ~50MHz and conditioned by AFMUX selection. + * It could be disabled for low frequencies or if AFMUX is selected + * but the function is not used, typically for TRACE. + * If high speed low voltage pad mode is node enable, platform will + * over consume. + * + * 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 SoC! + * => TF-A enables the low power mode only if VDD < 2.7V (in DT) + * but this value needs to be consistent with board design. + */ + if (stm32_get_otp_value(HW2_OTP, &otp_value) != 0) { + panic(); + } + + product_below_2v5 = (otp_value & HW2_OTP_PRODUCT_BELOW_2V5) != 0U; + + /* Get VDD supply */ + vdd_voltage = dt_get_pwr_vdd_voltage(); + + /* Check if VDD is Low Voltage */ + if (vdd_voltage == 0U) { + WARN("VDD unknown\n"); + } else if (vdd_voltage < 2700000U) { + enable_high_speed_mode_low_voltage(); + + if (!product_below_2v5) { + INFO("Product_below_2v5=0: HSLVEN protected by HW\n"); + } + } else { + if (product_below_2v5) { + ERROR("Product_below_2v5=1:\n"); + ERROR("\tHSLVEN update is destructive,\n"); + ERROR("\tno update as VDD > 2.7V\n"); + panic(); + } + } +} + +void stm32mp1_syscfg_init(void) +{ +#if STM32MP15 + uint32_t bootr; + + /* + * Interconnect update : select master using the port 1. + * LTDC = AXI_M9. + */ + mmio_write_32(SYSCFG_BASE + SYSCFG_ICNR, SYSCFG_ICNR_AXI_M9); + + /* Disable Pull-Down for boot pin connected to VDD */ + bootr = mmio_read_32(SYSCFG_BASE + SYSCFG_BOOTR) & + SYSCFG_BOOTR_BOOT_MASK; + mmio_clrsetbits_32(SYSCFG_BASE + SYSCFG_BOOTR, SYSCFG_BOOTR_BOOTPD_MASK, + bootr << SYSCFG_BOOTR_BOOTPD_SHIFT); +#endif + + stm32mp1_syscfg_set_hslv(); + + stm32mp1_syscfg_enable_io_compensation_start(); +} + +void stm32mp1_syscfg_enable_io_compensation_start(void) +{ + /* + * Activate automatic I/O compensation. + * Warning: need to ensure CSI enabled and ready in clock driver. + * Enable non-secure clock, we assume non-secure is suspended. + */ + clk_enable(SYSCFG); + + mmio_setbits_32(SYSCFG_BASE + CMPCR_CMPENSETR_OFFSET + SYSCFG_CMPCR, + SYSCFG_CMPENSETR_MPU_EN); +#if STM32MP13 + mmio_setbits_32(SYSCFG_BASE + CMPCR_CMPENSETR_OFFSET + SYSCFG_CMPSD1CR, + SYSCFG_CMPENSETR_MPU_EN); + mmio_setbits_32(SYSCFG_BASE + CMPCR_CMPENSETR_OFFSET + SYSCFG_CMPSD2CR, + SYSCFG_CMPENSETR_MPU_EN); + +#endif +} + +void stm32mp1_syscfg_enable_io_compensation_finish(void) +{ + enable_io_comp_cell_finish(SYSCFG_CMPCR); +#if STM32MP13 + enable_io_comp_cell_finish(SYSCFG_CMPSD1CR); + enable_io_comp_cell_finish(SYSCFG_CMPSD2CR); +#endif +} + +void stm32mp1_syscfg_disable_io_compensation(void) +{ + clk_enable(SYSCFG); + + /* + * Deactivate automatic I/O compensation. + * Warning: CSI is disabled automatically in STOP if not + * requested for other usages and always OFF in STANDBY. + * Disable non-secure SYSCFG clock, we assume non-secure is suspended. + */ + disable_io_comp_cell(SYSCFG_CMPCR); +#if STM32MP13 + disable_io_comp_cell(SYSCFG_CMPSD1CR); + disable_io_comp_cell(SYSCFG_CMPSD2CR); +#endif + + clk_disable(SYSCFG); +} + +/* + * @brief Get silicon revision from SYSCFG registers. + * @retval chip version (REV_ID). + */ +uint32_t stm32mp1_syscfg_get_chip_version(void) +{ + return (mmio_read_32(SYSCFG_BASE + SYSCFG_IDC) & + SYSCFG_IDC_REV_ID_MASK) >> SYSCFG_IDC_REV_ID_SHIFT; +} + +/* + * @brief Get device ID from SYSCFG registers. + * @retval device ID (DEV_ID). + */ +uint32_t stm32mp1_syscfg_get_chip_dev_id(void) +{ + return mmio_read_32(SYSCFG_BASE + SYSCFG_IDC) & SYSCFG_IDC_DEV_ID_MASK; +} + +#if STM32MP13 +void stm32mp1_syscfg_boot_mode_enable(void) +{ + mmio_setbits_32(SYSCFG_BASE + SYSCFG_BOOTCR, SYSCFG_BOOTCR_BMEN); +} + +void stm32mp1_syscfg_boot_mode_disable(void) +{ + mmio_clrbits_32(SYSCFG_BASE + SYSCFG_BOOTCR, SYSCFG_BOOTCR_BMEN); +} +#endif |