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/*
* Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <string.h>
#include <common/debug.h>
#include <lib/mmio.h>
#include <emi_mpu.h>
#if ENABLE_EMI_MPU_SW_LOCK
static unsigned char region_lock_state[EMI_MPU_REGION_NUM];
#endif
#define EMI_MPU_START_MASK (0x00FFFFFF)
#define EMI_MPU_END_MASK (0x00FFFFFF)
#define EMI_MPU_APC_SW_LOCK_MASK (0x00FFFFFF)
#define EMI_MPU_APC_HW_LOCK_MASK (0x80FFFFFF)
static int _emi_mpu_set_protection(unsigned int start, unsigned int end,
unsigned int apc)
{
unsigned int dgroup;
unsigned int region;
region = (start >> 24) & 0xFF;
start &= EMI_MPU_START_MASK;
dgroup = (end >> 24) & 0xFF;
end &= EMI_MPU_END_MASK;
if ((region >= EMI_MPU_REGION_NUM) || (dgroup > EMI_MPU_DGROUP_NUM)) {
WARN("invalid region, domain\n");
return -1;
}
#if ENABLE_EMI_MPU_SW_LOCK
if (region_lock_state[region] == 1) {
WARN("invalid region\n");
return -1;
}
if ((dgroup == 0) && ((apc >> 31) & 0x1)) {
region_lock_state[region] = 1;
}
apc &= EMI_MPU_APC_SW_LOCK_MASK;
#else
apc &= EMI_MPU_APC_HW_LOCK_MASK;
#endif
if ((start >= DRAM_OFFSET) && (end >= start)) {
start -= DRAM_OFFSET;
end -= DRAM_OFFSET;
} else {
WARN("invalid range\n");
return -1;
}
mmio_write_32(EMI_MPU_SA(region), start);
mmio_write_32(EMI_MPU_EA(region), end);
mmio_write_32(EMI_MPU_APC(region, dgroup), apc);
#if defined(SUB_EMI_MPU_BASE)
mmio_write_32(SUB_EMI_MPU_SA(region), start);
mmio_write_32(SUB_EMI_MPU_EA(region), end);
mmio_write_32(SUB_EMI_MPU_APC(region, dgroup), apc);
#endif
return 1;
}
int emi_mpu_set_protection(struct emi_region_info_t *region_info)
{
unsigned int start, end;
int i;
if (region_info->region >= EMI_MPU_REGION_NUM) {
WARN("invalid region\n");
return -1;
}
start = (unsigned int)(region_info->start >> EMI_MPU_ALIGN_BITS) |
(region_info->region << 24);
for (i = EMI_MPU_DGROUP_NUM - 1; i >= 0; i--) {
end = (unsigned int)(region_info->end >> EMI_MPU_ALIGN_BITS) |
(i << 24);
_emi_mpu_set_protection(start, end, region_info->apc[i]);
}
return 0;
}
void emi_mpu_init(void)
{
/* TODO: more setting for EMI MPU. */
}
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