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// SPDX-License-Identifier: GPL-2.0-only
/*
* Erratas to be applied for Andes CPU cores
*
* Copyright (C) 2023 Renesas Electronics Corporation.
*
* Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
*/
#include <linux/memory.h>
#include <linux/module.h>
#include <asm/alternative.h>
#include <asm/cacheflush.h>
#include <asm/errata_list.h>
#include <asm/patch.h>
#include <asm/processor.h>
#include <asm/sbi.h>
#include <asm/vendorid_list.h>
#define ANDES_AX45MP_MARCHID 0x8000000000008a45UL
#define ANDES_AX45MP_MIMPID 0x500UL
#define ANDES_SBI_EXT_ANDES 0x0900031E
#define ANDES_SBI_EXT_IOCP_SW_WORKAROUND 1
static long ax45mp_iocp_sw_workaround(void)
{
struct sbiret ret;
/*
* ANDES_SBI_EXT_IOCP_SW_WORKAROUND SBI EXT checks if the IOCP is missing and
* cache is controllable only then CMO will be applied to the platform.
*/
ret = sbi_ecall(ANDES_SBI_EXT_ANDES, ANDES_SBI_EXT_IOCP_SW_WORKAROUND,
0, 0, 0, 0, 0, 0);
return ret.error ? 0 : ret.value;
}
static void errata_probe_iocp(unsigned int stage, unsigned long arch_id, unsigned long impid)
{
static bool done;
if (!IS_ENABLED(CONFIG_ERRATA_ANDES_CMO))
return;
if (done)
return;
done = true;
if (arch_id != ANDES_AX45MP_MARCHID || impid != ANDES_AX45MP_MIMPID)
return;
if (!ax45mp_iocp_sw_workaround())
return;
/* Set this just to make core cbo code happy */
riscv_cbom_block_size = 1;
riscv_noncoherent_supported();
}
void __init_or_module andes_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid, unsigned long impid,
unsigned int stage)
{
if (stage == RISCV_ALTERNATIVES_BOOT)
errata_probe_iocp(stage, archid, impid);
/* we have nothing to patch here ATM so just return back */
}
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