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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2025 MIPS.
*/
#include <linux/memory.h>
#include <linux/module.h>
#include <asm/text-patching.h>
#include <asm/alternative.h>
#include <asm/cacheflush.h>
#include <asm/errata_list.h>
#include <asm/vendorid_list.h>
#include <asm/vendor_extensions.h>
#include <asm/vendor_extensions/mips.h>
static inline bool errata_probe_pause(unsigned int stage)
{
if (!IS_ENABLED(CONFIG_ERRATA_MIPS_P8700_PAUSE_OPCODE))
return false;
if (!riscv_isa_vendor_extension_available(MIPS_VENDOR_ID, XMIPSEXECTL))
return false;
if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
return false;
return true;
}
static inline bool errata_probe_wfi(unsigned int stage)
{
if (!IS_ENABLED(CONFIG_ERRATA_MIPS_P8700_WFI))
return false;
if (!riscv_isa_vendor_extension_available(MIPS_VENDOR_ID, XMIPSEXECTL))
return false;
if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
return false;
return true;
}
static u32 mips_errata_probe(unsigned int stage)
{
u32 cpu_req_errata = 0;
if (errata_probe_pause(stage))
cpu_req_errata |= BIT(ERRATA_MIPS_P8700_PAUSE_OPCODE);
if (errata_probe_wfi(stage))
cpu_req_errata |= BIT(ERRATA_MIPS_P8700_WFI);
return cpu_req_errata;
}
void mips_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid, unsigned long impid,
unsigned int stage)
{
struct alt_entry *alt;
u32 cpu_req_errata = mips_errata_probe(stage);
u32 tmp;
void *oldptr, *altptr;
BUILD_BUG_ON(ERRATA_MIPS_NUMBER >= RISCV_VENDOR_EXT_ALTERNATIVES_BASE);
for (alt = begin; alt < end; alt++) {
if (alt->vendor_id != MIPS_VENDOR_ID)
continue;
if (alt->patch_id >= ERRATA_MIPS_NUMBER)
continue;
tmp = (1U << alt->patch_id);
if (cpu_req_errata & tmp) {
oldptr = ALT_OLD_PTR(alt);
altptr = ALT_ALT_PTR(alt);
if (stage == RISCV_ALTERNATIVES_EARLY_BOOT) {
memcpy(oldptr, altptr, alt->alt_len);
} else {
mutex_lock(&text_mutex);
patch_text_nosync(oldptr, altptr, alt->alt_len);
mutex_unlock(&text_mutex);
}
}
}
if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
local_flush_icache_all();
}
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