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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (C) 2023 Renesas Electronics Corp.
*
*/
#include <andes/andes45.h>
#include <andes/andes_sbi.h>
#include <sbi/riscv_asm.h>
#include <sbi/sbi_error.h>
enum sbi_ext_andes_fid {
SBI_EXT_ANDES_FID0 = 0, /* Reserved for future use */
SBI_EXT_ANDES_IOCP_SW_WORKAROUND,
};
static bool andes45_cache_controllable(void)
{
return (((csr_read(CSR_MICM_CFG) & MICM_CFG_ISZ_MASK) ||
(csr_read(CSR_MDCM_CFG) & MDCM_CFG_DSZ_MASK)) &&
(csr_read(CSR_MMSC_CFG) & MMSC_CFG_CCTLCSR_MASK) &&
(csr_read(CSR_MCACHE_CTL) & MCACHE_CTL_CCTL_SUEN_MASK) &&
misa_extension('U'));
}
static bool andes45_iocp_disabled(void)
{
return (csr_read(CSR_MMSC_CFG) & MMSC_IOCP_MASK) ? false : true;
}
static bool andes45_apply_iocp_sw_workaround(void)
{
return andes45_cache_controllable() & andes45_iocp_disabled();
}
int andes_sbi_vendor_ext_provider(long funcid,
struct sbi_trap_regs *regs,
struct sbi_ecall_return *out,
const struct fdt_match *match)
{
switch (funcid) {
case SBI_EXT_ANDES_IOCP_SW_WORKAROUND:
out->value = andes45_apply_iocp_sw_workaround();
break;
default:
return SBI_EINVAL;
}
return 0;
}
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