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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2021 Western Digital Corporation or its affiliates.
- *
- * Authors:
- * Anup Patel <anup.patel@wdc.com>
- */
- #include <libfdt.h>
- #include <PlatformOverride.h>
- #include <sbi/riscv_asm.h>
- #include <sbi/sbi_domain.h>
- #include <sbi/sbi_hartmask.h>
- #include <sbi/sbi_platform.h>
- #include <sbi/sbi_string.h>
- #include <sbi/sbi_math.h>
- #include <sbi_utils/fdt/fdt_domain.h>
- #include <sbi_utils/fdt/fdt_fixup.h>
- #include <sbi_utils/fdt/fdt_helper.h>
- #include <sbi_utils/irqchip/fdt_irqchip.h>
- #include <sbi_utils/serial/fdt_serial.h>
- #include <sbi_utils/timer/fdt_timer.h>
- #include <sbi_utils/ipi/fdt_ipi.h>
- #include <sbi_utils/reset/fdt_reset.h>
- extern const struct platform_override sifive_fu540;
- static const struct platform_override *special_platforms[] = {
- &sifive_fu540,
- };
- 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)
- {
- int pos, noff;
- const struct platform_override *plat;
- const struct fdt_match *match;
- for (pos = 0; pos < array_size(special_platforms); pos++) {
- plat = special_platforms[pos];
- if (!plat->match_table)
- continue;
- noff = fdt_find_match(fdt, -1, plat->match_table, &match);
- if (noff < 0)
- continue;
- generic_plat = plat;
- generic_plat_match = match;
- break;
- }
- }
- extern struct sbi_platform platform;
- 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));
- 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;
- generic_hart_index2id[hart_count++] = hartid;
- }
- platform.hart_count = hart_count;
- /* Return original FDT pointer */
- return arg1;
- fail:
- while (1)
- wfi();
- }
- static int generic_early_init(bool cold_boot)
- {
- int rc;
- if (generic_plat && generic_plat->early_init) {
- rc = generic_plat->early_init(cold_boot, generic_plat_match);
- if (rc)
- return rc;
- }
- if (!cold_boot)
- return 0;
- return fdt_reset_init();
- }
- static int generic_final_init(bool cold_boot)
- {
- void *fdt;
- int rc;
- 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 = sbi_scratch_thishart_arg1_ptr();
- 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 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_domains_init(void)
- {
- return fdt_domains_populate(sbi_scratch_thishart_arg1_ptr());
- }
- 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_system_reset_check(u32 reset_type, u32 reset_reason)
- {
- if (generic_plat && generic_plat->system_reset_check)
- return generic_plat->system_reset_check(reset_type,
- reset_reason,
- generic_plat_match);
- return fdt_system_reset_check(reset_type, reset_reason);
- }
- static void generic_system_reset(u32 reset_type, u32 reset_reason)
- {
- if (generic_plat && generic_plat->system_reset) {
- generic_plat->system_reset(reset_type, reset_reason,
- generic_plat_match);
- return;
- }
- fdt_system_reset(reset_type, reset_reason);
- }
- #define EDK2_ROOT_FW_REGION 0
- #define EDK2_FW_REGION 1
- #define EDK2_VARIABLE_REGION 2
- #define EDK2_ALL_REGION 3
- #define EDK2_END_REGION 4
- static struct sbi_domain_memregion root_memregs[EDK2_END_REGION + 1] = { 0 };
- struct sbi_domain_memregion *get_mem_regions(void) {
- /* EDK2 root firmware domain memory region */
- root_memregs[EDK2_ROOT_FW_REGION].order = log2roundup(FixedPcdGet32(PcdRootFirmwareDomainSize));
- root_memregs[EDK2_ROOT_FW_REGION].base = FixedPcdGet32(PcdRootFirmwareDomainBaseAddress);
- root_memregs[EDK2_ROOT_FW_REGION].flags = 0;
- /*EDK2 firmware domain memory region */
- root_memregs[EDK2_FW_REGION].order = log2roundup(FixedPcdGet32(PcdFirmwareDomainSize));
- root_memregs[EDK2_FW_REGION].base = FixedPcdGet32(PcdFirmwareDomainBaseAddress);
- root_memregs[EDK2_FW_REGION].flags = SBI_DOMAIN_MEMREGION_EXECUTABLE | SBI_DOMAIN_MEMREGION_READABLE;
- /*EDK2 firmware domain memory region */
- root_memregs[EDK2_VARIABLE_REGION].order = log2roundup(FixedPcdGet32(PcdVariableFirmwareRegionSize));
- root_memregs[EDK2_VARIABLE_REGION].base = FixedPcdGet32(PcdVariableFirmwareRegionBaseAddress);
- root_memregs[EDK2_VARIABLE_REGION].flags = SBI_DOMAIN_MEMREGION_READABLE | SBI_DOMAIN_MEMREGION_WRITEABLE;
- /* EDK2 domain allow everything memory region */
- root_memregs[EDK2_ALL_REGION].order = __riscv_xlen;
- root_memregs[EDK2_ALL_REGION].base = 0;
- root_memregs[EDK2_ALL_REGION].flags = (SBI_DOMAIN_MEMREGION_READABLE |
- SBI_DOMAIN_MEMREGION_WRITEABLE |
- SBI_DOMAIN_MEMREGION_EXECUTABLE);
- /* EDK2 domain memory region end */
- root_memregs[EDK2_END_REGION].order = 0;
- return root_memregs;
- }
- const struct sbi_platform_operations platform_ops = {
- .early_init = generic_early_init,
- .final_init = generic_final_init,
- .early_exit = generic_early_exit,
- .final_exit = generic_final_exit,
- .domains_root_regions = get_mem_regions,
- .domains_init = generic_domains_init,
- .console_init = fdt_serial_init,
- .irqchip_init = fdt_irqchip_init,
- .irqchip_exit = fdt_irqchip_exit,
- .ipi_init = fdt_ipi_init,
- .ipi_exit = fdt_ipi_exit,
- .get_tlbr_flush_limit = generic_tlbr_flush_limit,
- .timer_init = fdt_timer_init,
- .timer_exit = fdt_timer_exit,
- };
- #if FixedPcdGet32(PcdBootableHartNumber) == 4
- #define U540_BOOTABLE_HART_COUNT FixedPcdGet32(PcdBootableHartNumber)
- static u32 U540_hart_index2id[U540_BOOTABLE_HART_COUNT] = {1, 2, 3, 4};
- #endif
- struct sbi_platform platform = {
- .opensbi_version = OPENSBI_VERSION,
- .platform_version = SBI_PLATFORM_VERSION(0x0, 0x01),
- .name = "Generic",
- .features = SBI_PLATFORM_DEFAULT_FEATURES,
- .hart_count = SBI_HARTMASK_MAX_BITS,
- // TODO: Workaround for U540. Not sure why we need this. OpenSBI doesn't need it.
- #if FixedPcdGet32(PcdBootableHartNumber) == 4
- .hart_index2id = U540_hart_index2id,
- #else
- .hart_index2id = generic_hart_index2id,
- #endif
- // TODO: Any reason why it shouldn't just be SBI_PLATFORM_DEFAULT_HART_STACK_SIZE?
- .hart_stack_size = FixedPcdGet32(PcdOpenSbiStackSize),
- .platform_ops_addr = (unsigned long)&platform_ops
- };
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