/* * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2020 Western Digital Corporation or its affiliates. * * Authors: * Anup Patel */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* List of platform override modules generated at compile time */ extern const struct platform_override *platform_override_modules[]; extern unsigned long platform_override_modules_size; static const struct platform_override *generic_plat = NULL; static const struct fdt_match *generic_plat_match = NULL; static void fw_platform_lookup_special(void *fdt, int root_offset) { const struct platform_override *plat; const struct fdt_match *match; int pos; for (pos = 0; pos < platform_override_modules_size; pos++) { plat = platform_override_modules[pos]; if (!plat->match_table) continue; match = fdt_match_node(fdt, root_offset, plat->match_table); if (!match) continue; generic_plat = plat; generic_plat_match = match; break; } } extern struct sbi_platform platform; static bool platform_has_mlevel_imsic = false; static u32 generic_hart_index2id[SBI_HARTMASK_MAX_BITS] = { 0 }; /* * The fw_platform_init() function is called very early on the boot HART * OpenSBI reference firmwares so that platform specific code get chance * to update "platform" instance before it is used. * * The arguments passed to fw_platform_init() function are boot time state * of A0 to A4 register. The "arg0" will be boot HART id and "arg1" will * be address of FDT passed by previous booting stage. * * The return value of fw_platform_init() function is the FDT location. If * FDT is unchanged (or FDT is modified in-place) then fw_platform_init() * can always return the original FDT location (i.e. 'arg1') unmodified. */ unsigned long fw_platform_init(unsigned long arg0, unsigned long arg1, unsigned long arg2, unsigned long arg3, unsigned long arg4) { const char *model; void *fdt = (void *)arg1; u32 hartid, hart_count = 0; int rc, root_offset, cpus_offset, cpu_offset, len; root_offset = fdt_path_offset(fdt, "/"); if (root_offset < 0) goto fail; fw_platform_lookup_special(fdt, root_offset); model = fdt_getprop(fdt, root_offset, "model", &len); if (model) sbi_strncpy(platform.name, model, sizeof(platform.name) - 1); if (generic_plat && generic_plat->features) platform.features = generic_plat->features(generic_plat_match); cpus_offset = fdt_path_offset(fdt, "/cpus"); if (cpus_offset < 0) goto fail; fdt_for_each_subnode(cpu_offset, fdt, cpus_offset) { rc = fdt_parse_hart_id(fdt, cpu_offset, &hartid); if (rc) continue; if (SBI_HARTMASK_MAX_BITS <= hartid) continue; if (!fdt_node_is_enabled(fdt, cpu_offset)) continue; generic_hart_index2id[hart_count++] = hartid; } platform.hart_count = hart_count; platform_has_mlevel_imsic = fdt_check_imsic_mlevel(fdt); /* Return original FDT pointer */ return arg1; fail: while (1) wfi(); } static int generic_nascent_init(void) { if (platform_has_mlevel_imsic) imsic_local_irqchip_init(); return 0; } static int generic_early_init(bool cold_boot) { if (!generic_plat || !generic_plat->early_init) return 0; return generic_plat->early_init(cold_boot, generic_plat_match); } static int generic_final_init(bool cold_boot) { void *fdt; int rc; if (cold_boot) fdt_reset_init(); if (generic_plat && generic_plat->final_init) { rc = generic_plat->final_init(cold_boot, generic_plat_match); if (rc) return rc; } if (!cold_boot) return 0; fdt = fdt_get_address(); fdt_cpu_fixup(fdt); fdt_fixups(fdt); fdt_domain_fixup(fdt); if (generic_plat && generic_plat->fdt_fixup) { rc = generic_plat->fdt_fixup(fdt, generic_plat_match); if (rc) return rc; } return 0; } static int generic_vendor_ext_check(long extid) { if (generic_plat && generic_plat->vendor_ext_check) return generic_plat->vendor_ext_check(extid, generic_plat_match); return 0; } static int generic_vendor_ext_provider(long extid, long funcid, const struct sbi_trap_regs *regs, unsigned long *out_value, struct sbi_trap_info *out_trap) { if (generic_plat && generic_plat->vendor_ext_provider) { return generic_plat->vendor_ext_provider(extid, funcid, regs, out_value, out_trap, generic_plat_match); } return SBI_ENOTSUPP; } static void generic_early_exit(void) { if (generic_plat && generic_plat->early_exit) generic_plat->early_exit(generic_plat_match); } static void generic_final_exit(void) { if (generic_plat && generic_plat->final_exit) generic_plat->final_exit(generic_plat_match); } static int generic_extensions_init(struct sbi_hart_features *hfeatures) { if (generic_plat && generic_plat->extensions_init) return generic_plat->extensions_init(generic_plat_match, hfeatures); return 0; } static int generic_domains_init(void) { return fdt_domains_populate(fdt_get_address()); } static u64 generic_tlbr_flush_limit(void) { if (generic_plat && generic_plat->tlbr_flush_limit) return generic_plat->tlbr_flush_limit(generic_plat_match); return SBI_PLATFORM_TLB_RANGE_FLUSH_LIMIT_DEFAULT; } static int generic_pmu_init(void) { return fdt_pmu_setup(fdt_get_address()); } static uint64_t generic_pmu_xlate_to_mhpmevent(uint32_t event_idx, uint64_t data) { uint64_t evt_val = 0; /* data is valid only for raw events and is equal to event selector */ if (event_idx == SBI_PMU_EVENT_RAW_IDX) evt_val = data; else { /** * Generic platform follows the SBI specification recommendation * i.e. zero extended event_idx is used as mhpmevent value for * hardware general/cache events if platform does't define one. */ evt_val = fdt_pmu_get_select_value(event_idx); if (!evt_val) evt_val = (uint64_t)event_idx; } return evt_val; } static int generic_console_init(void) { if (semihosting_enabled()) return semihosting_init(); else return fdt_serial_init(); } const struct sbi_platform_operations platform_ops = { .nascent_init = generic_nascent_init, .early_init = generic_early_init, .final_init = generic_final_init, .early_exit = generic_early_exit, .final_exit = generic_final_exit, .extensions_init = generic_extensions_init, .domains_init = generic_domains_init, .console_init = generic_console_init, .irqchip_init = fdt_irqchip_init, .irqchip_exit = fdt_irqchip_exit, .ipi_init = fdt_ipi_init, .ipi_exit = fdt_ipi_exit, .pmu_init = generic_pmu_init, .pmu_xlate_to_mhpmevent = generic_pmu_xlate_to_mhpmevent, .get_tlbr_flush_limit = generic_tlbr_flush_limit, .timer_init = fdt_timer_init, .timer_exit = fdt_timer_exit, .vendor_ext_check = generic_vendor_ext_check, .vendor_ext_provider = generic_vendor_ext_provider, }; struct sbi_platform platform = { .opensbi_version = OPENSBI_VERSION, .platform_version = SBI_PLATFORM_VERSION(CONFIG_PLATFORM_GENERIC_MAJOR_VER, CONFIG_PLATFORM_GENERIC_MINOR_VER), .name = CONFIG_PLATFORM_GENERIC_NAME, .features = SBI_PLATFORM_DEFAULT_FEATURES, .hart_count = SBI_HARTMASK_MAX_BITS, .hart_index2id = generic_hart_index2id, .hart_stack_size = SBI_PLATFORM_DEFAULT_HART_STACK_SIZE, .platform_ops_addr = (unsigned long)&platform_ops };