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// SPDX-License-Identifier: GPL-2.0
/*
* StarFive cache controller driver
*
* Copyright (C) 2023 StarFive Technology Co., Ltd.
*
*/
#include <linux/cacheflush.h>
#include <linux/of.h>
#include <asm/dma-noncoherent.h>
#include <asm/sbi.h>
#define STARFIVE_SBI_EXT 0x0900067e
enum starfive_sbi_ext_fid {
STARFIVE_SBI_EXT_L2_FLUSH = 0,
STARFIVE_SBI_EXT_L2_INVALIDATE,
};
static void sbi_cache_flush(phys_addr_t paddr, size_t size)
{
sbi_ecall(STARFIVE_SBI_EXT, STARFIVE_SBI_EXT_L2_FLUSH,
paddr, size, 0, 0, 0, 0);
}
static void sbi_cache_invalidate(phys_addr_t paddr, size_t size)
{
sbi_ecall(STARFIVE_SBI_EXT, STARFIVE_SBI_EXT_L2_INVALIDATE,
paddr, size, 0, 0, 0, 0);
}
static const struct riscv_nonstd_cache_ops dubhe_cmo_ops __initdata = {
.wback = &sbi_cache_flush,
.inv = &sbi_cache_invalidate,
.wback_inv = &sbi_cache_invalidate,
};
static const struct of_device_id starfive_cache_ids[] = {
{ .compatible = "starfive,dubhe-cache" },
{ /* end of table */ }
};
static int __init starfive_cache_init(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, starfive_cache_ids);
if (!of_device_is_available(np))
return -ENODEV;
riscv_noncoherent_supported();
riscv_noncoherent_register_cache_ops(&dubhe_cmo_ops);
return 0;
}
arch_initcall(starfive_cache_init);
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