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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 dump_emi_mpu_regions(void)
{
unsigned long apc[EMI_MPU_DGROUP_NUM], sa, ea;
int region, i;
/* Only dump 8 regions(max: EMI_MPU_REGION_NUM --> 32) */
for (region = 0; region < 8; ++region) {
for (i = 0; i < EMI_MPU_DGROUP_NUM; ++i)
apc[i] = mmio_read_32(EMI_MPU_APC(region, i));
sa = mmio_read_32(EMI_MPU_SA(region));
ea = mmio_read_32(EMI_MPU_EA(region));
INFO("region %d:\n", region);
INFO("\tsa:0x%lx, ea:0x%lx, apc0: 0x%lx apc1: 0x%lx\n",
sa, ea, apc[0], apc[1]);
}
}
void emi_mpu_init(void)
{
struct emi_region_info_t region_info;
/* SCP DRAM */
region_info.start = 0x50000000ULL;
region_info.end = 0x51400000ULL;
region_info.region = 2;
SET_ACCESS_PERMISSION(region_info.apc, 1,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
NO_PROTECTION, FORBIDDEN, FORBIDDEN, NO_PROTECTION);
emi_mpu_set_protection(®ion_info);
/* DSP protect address */
region_info.start = 0x60000000ULL; /* dram base addr */
region_info.end = 0x610FFFFFULL;
region_info.region = 3;
SET_ACCESS_PERMISSION(region_info.apc, 1,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROTECTION,
FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROTECTION);
emi_mpu_set_protection(®ion_info);
/* Forbidden All */
region_info.start = 0x40000000ULL; /* dram base addr */
region_info.end = 0x1FFFF0000ULL;
region_info.region = 4;
SET_ACCESS_PERMISSION(region_info.apc, 1,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROTECTION);
emi_mpu_set_protection(®ion_info);
dump_emi_mpu_regions();
}
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