diff options
Diffstat (limited to 'arch/arm/mach-k3/am62x/am625_init.c')
| -rw-r--r-- | arch/arm/mach-k3/am62x/am625_init.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/arch/arm/mach-k3/am62x/am625_init.c b/arch/arm/mach-k3/am62x/am625_init.c new file mode 100644 index 00000000000..ed8d24e0433 --- /dev/null +++ b/arch/arm/mach-k3/am62x/am625_init.c @@ -0,0 +1,312 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AM625: SoC specific initialization + * + * Copyright (C) 2020-2022 Texas Instruments Incorporated - https://www.ti.com/ + * Suman Anna <s-anna@ti.com> + */ + +#include <spl.h> +#include <asm/io.h> +#include <asm/arch/hardware.h> +#include <dm.h> +#include <dm/uclass-internal.h> +#include <dm/pinctrl.h> +#include <dm/ofnode.h> + +#include "../sysfw-loader.h" +#include "../common.h" + +#define RTC_BASE_ADDRESS 0x2b1f0000 +#define REG_K3RTC_S_CNT_LSW (RTC_BASE_ADDRESS + 0x18) +#define REG_K3RTC_KICK0 (RTC_BASE_ADDRESS + 0x70) +#define REG_K3RTC_KICK1 (RTC_BASE_ADDRESS + 0x74) + +/* Magic values for lock/unlock */ +#define K3RTC_KICK0_UNLOCK_VALUE 0x83e70b13 +#define K3RTC_KICK1_UNLOCK_VALUE 0x95a4f1e0 + +/* TISCI DEV ID for A53 Clock */ +#define AM62X_DEV_A53SS0_CORE_0_DEV_ID 135 + +/* + * This uninitialized global variable would normal end up in the .bss section, + * but the .bss is cleared between writing and reading this variable, so move + * it to the .data section. + */ +u32 bootindex __section(".data"); +static struct rom_extended_boot_data bootdata __section(".data"); + +static void store_boot_info_from_rom(void) +{ + bootindex = *(u32 *)(CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX); + memcpy(&bootdata, (uintptr_t *)ROM_EXTENDED_BOOT_DATA_INFO, + sizeof(struct rom_extended_boot_data)); +} + +static void ctrl_mmr_unlock(void) +{ + /* Unlock all WKUP_CTRL_MMR0 module registers */ + mmr_unlock(WKUP_CTRL_MMR0_BASE, 0); + mmr_unlock(WKUP_CTRL_MMR0_BASE, 1); + mmr_unlock(WKUP_CTRL_MMR0_BASE, 2); + mmr_unlock(WKUP_CTRL_MMR0_BASE, 3); + mmr_unlock(WKUP_CTRL_MMR0_BASE, 4); + mmr_unlock(WKUP_CTRL_MMR0_BASE, 5); + mmr_unlock(WKUP_CTRL_MMR0_BASE, 6); + mmr_unlock(WKUP_CTRL_MMR0_BASE, 7); + + /* Unlock all CTRL_MMR0 module registers */ + mmr_unlock(CTRL_MMR0_BASE, 0); + mmr_unlock(CTRL_MMR0_BASE, 1); + mmr_unlock(CTRL_MMR0_BASE, 2); + mmr_unlock(CTRL_MMR0_BASE, 4); + mmr_unlock(CTRL_MMR0_BASE, 6); + + /* Unlock all MCU_CTRL_MMR0 module registers */ + mmr_unlock(MCU_CTRL_MMR0_BASE, 0); + mmr_unlock(MCU_CTRL_MMR0_BASE, 1); + mmr_unlock(MCU_CTRL_MMR0_BASE, 2); + mmr_unlock(MCU_CTRL_MMR0_BASE, 3); + mmr_unlock(MCU_CTRL_MMR0_BASE, 4); + mmr_unlock(MCU_CTRL_MMR0_BASE, 6); + + /* Unlock PADCFG_CTRL_MMR padconf registers */ + mmr_unlock(PADCFG_MMR0_BASE, 1); + mmr_unlock(PADCFG_MMR1_BASE, 1); +} + +static __maybe_unused void enable_mcu_esm_reset(void) +{ + /* Set CTRLMMR_MCU_RST_CTRL:MCU_ESM_ERROR_RST_EN_Z to '0' (low active) */ + u32 stat = readl(CTRLMMR_MCU_RST_CTRL); + + stat &= RST_CTRL_ESM_ERROR_RST_EN_Z_MASK; + writel(stat, CTRLMMR_MCU_RST_CTRL); +} + +/* + * RTC Erratum i2327 Workaround for Silicon Revision 1 + * + * Due to a bug in initial synchronization out of cold power on, + * IRQ status can get locked infinitely if we do not unlock RTC + * + * This workaround *must* be applied within 1 second of power on, + * So, this is closest point to be able to guarantee the max + * timing. + * + * https://www.ti.com/lit/er/sprz487c/sprz487c.pdf + */ +static __maybe_unused void rtc_erratumi2327_init(void) +{ + u32 counter; + + /* + * If counter has gone past 1, nothing we can do, leave + * system locked! This is the only way we know if RTC + * can be used for all practical purposes. + */ + counter = readl(REG_K3RTC_S_CNT_LSW); + if (counter > 1) + return; + /* + * Need to set this up at the very start + * MUST BE DONE under 1 second of boot. + */ + writel(K3RTC_KICK0_UNLOCK_VALUE, REG_K3RTC_KICK0); + writel(K3RTC_KICK1_UNLOCK_VALUE, REG_K3RTC_KICK1); +} + +#if CONFIG_IS_ENABLED(OF_CONTROL) +static int get_a53_cpu_clock_index(ofnode node) +{ + int count, i; + struct ofnode_phandle_args *args; + ofnode clknode; + + clknode = ofnode_path("/bus@f0000/system-controller@44043000/clock-controller"); + if (!ofnode_valid(clknode)) + return -1; + + count = ofnode_count_phandle_with_args(node, "assigned-clocks", "#clock-cells", 0); + + for (i = 0; i < count; i++) { + if (!ofnode_parse_phandle_with_args(node, "assigned-clocks", + "#clock-cells", 0, i, args)) { + if (ofnode_equal(clknode, args->node) && + args->args[0] == AM62X_DEV_A53SS0_CORE_0_DEV_ID) + return i; + } + } + + return -1; +} + +static void fixup_a53_cpu_freq_by_speed_grade(void) +{ + int index, size; + u32 *rates; + ofnode node; + + node = ofnode_path("/a53@0"); + if (!ofnode_valid(node)) + return; + + rates = fdt_getprop_w(ofnode_to_fdt(node), ofnode_to_offset(node), + "assigned-clock-rates", &size); + + index = get_a53_cpu_clock_index(node); + + if (!rates || index < 0 || index >= (size / sizeof(u32))) { + printf("Wrong A53 assigned-clocks configuration\n"); + return; + } + + rates[index] = cpu_to_fdt32(k3_get_a53_max_frequency()); + + printf("Changed A53 CPU frequency to %dHz (%c grade) in DT\n", + k3_get_a53_max_frequency(), k3_get_speed_grade()); +} +#else +static void fixup_a53_cpu_freq_by_speed_grade(void) +{ +} +#endif + +void board_init_f(ulong dummy) +{ + struct udevice *dev; + int ret; + + if (IS_ENABLED(CONFIG_CPU_V7R)) { + setup_k3_mpu_regions(); + rtc_erratumi2327_init(); + } + + /* + * Cannot delay this further as there is a chance that + * K3_BOOT_PARAM_TABLE_INDEX can be over written by SPL MALLOC section. + */ + store_boot_info_from_rom(); + + ctrl_mmr_unlock(); + + /* Init DM early */ + spl_early_init(); + + /* + * Process pinctrl for the serial0 and serial3, aka WKUP_UART0 and + * MAIN_UART1 modules and continue regardless of the result of pinctrl. + * Do this without probing the device, but instead by searching the + * device that would request the given sequence number if probed. The + * UARTs will be used by the DM firmware and TIFS firmware images + * respectively and the firmware depend on SPL to initialize the pin + * settings. + */ + ret = uclass_find_device_by_seq(UCLASS_SERIAL, 0, &dev); + if (!ret) + pinctrl_select_state(dev, "default"); + + ret = uclass_find_device_by_seq(UCLASS_SERIAL, 3, &dev); + if (!ret) + pinctrl_select_state(dev, "default"); + + preloader_console_init(); + + /* + * Allow establishing an early console as required for example when + * doing a UART-based boot. Note that this console may not "survive" + * through a SYSFW PM-init step and will need a re-init in some way + * due to changing module clock frequencies. + */ + if (IS_ENABLED(CONFIG_K3_EARLY_CONS)) + early_console_init(); + + /* + * Configure and start up system controller firmware. Provide + * the U-Boot console init function to the SYSFW post-PM configuration + * callback hook, effectively switching on (or over) the console + * output. + */ + if (IS_ENABLED(CONFIG_K3_LOAD_SYSFW)) { + ret = is_rom_loaded_sysfw(&bootdata); + if (!ret) + panic("ROM has not loaded TIFS firmware\n"); + + k3_sysfw_loader(true, NULL, NULL); + } + + /* + * Relocate boot information to OCRAM (after TIFS has opend this + * region for us) so the next bootloader stages can keep access to + * primary vs backup bootmodes. + */ + if (IS_ENABLED(CONFIG_CPU_V7R)) + writel(bootindex, K3_BOOT_PARAM_TABLE_INDEX_OCRAM); + + /* + * Force probe of clk_k3 driver here to ensure basic default clock + * configuration is always done. + */ + if (IS_ENABLED(CONFIG_SPL_CLK_K3)) { + ret = uclass_get_device_by_driver(UCLASS_CLK, + DM_DRIVER_GET(ti_clk), + &dev); + if (ret) + printf("Failed to initialize clk-k3!\n"); + } + + /* Output System Firmware version info */ + k3_sysfw_print_ver(); + + if (IS_ENABLED(CONFIG_ESM_K3)) { + /* Probe/configure ESM0 */ + ret = uclass_get_device_by_name(UCLASS_MISC, "esm@420000", &dev); + if (ret) + printf("esm main init failed: %d\n", ret); + + /* Probe/configure MCUESM */ + ret = uclass_get_device_by_name(UCLASS_MISC, "esm@4100000", &dev); + if (ret) + printf("esm mcu init failed: %d\n", ret); + + enable_mcu_esm_reset(); + } + + if (IS_ENABLED(CONFIG_K3_AM64_DDRSS)) { + ret = uclass_get_device(UCLASS_RAM, 0, &dev); + if (ret) + panic("DRAM init failed: %d\n", ret); + } + spl_enable_cache(); + + fixup_a53_cpu_freq_by_speed_grade(); +} + +u32 spl_mmc_boot_mode(struct mmc *mmc, const u32 boot_device) +{ + u32 devstat = readl(CTRLMMR_MAIN_DEVSTAT); + u32 bootmode = (devstat & MAIN_DEVSTAT_PRIMARY_BOOTMODE_MASK) >> + MAIN_DEVSTAT_PRIMARY_BOOTMODE_SHIFT; + u32 bootmode_cfg = (devstat & MAIN_DEVSTAT_PRIMARY_BOOTMODE_CFG_MASK) >> + MAIN_DEVSTAT_PRIMARY_BOOTMODE_CFG_SHIFT; + + switch (bootmode) { + case BOOT_DEVICE_EMMC: + if (IS_ENABLED(CONFIG_SUPPORT_EMMC_BOOT)) + return MMCSD_MODE_EMMCBOOT; + if (IS_ENABLED(CONFIG_SPL_FS_FAT) || IS_ENABLED(CONFIG_SPL_FS_EXT4)) + return MMCSD_MODE_FS; + return MMCSD_MODE_EMMCBOOT; + case BOOT_DEVICE_MMC: + if (bootmode_cfg & MAIN_DEVSTAT_PRIMARY_MMC_FS_RAW_MASK) + return MMCSD_MODE_RAW; + default: + return MMCSD_MODE_FS; + } +} + +u32 spl_boot_device(void) +{ + return get_boot_device(); +} |