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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <libfdt.h>
#include <platform_override.h>
#include <sbi/riscv_asm.h>
#include <sbi/sbi_hartmask.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_string.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);
}
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_init = generic_domains_init,
.console_init = fdt_serial_init,
.irqchip_init = fdt_irqchip_init,
.irqchip_exit = fdt_irqchip_exit,
.ipi_send = fdt_ipi_send,
.ipi_clear = fdt_ipi_clear,
.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,
.system_reset_check = generic_system_reset_check,
.system_reset = generic_system_reset,
};
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,
.hart_index2id = generic_hart_index2id,
.hart_stack_size = SBI_PLATFORM_DEFAULT_HART_STACK_SIZE,
.platform_ops_addr = (unsigned long)&platform_ops
};
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