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/*
* Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <common/debug.h>
#include <emi_mpu.h>
#include <lib/mmio.h>
/*
* emi_mpu_set_region_protection: protect a region.
* @start: start address of the region
* @end: end address of the region
* @access_permission: EMI MPU access permission
* Return 0 for success, otherwise negative status code.
*/
static int _emi_mpu_set_protection(
unsigned long start, unsigned long end,
unsigned int apc)
{
unsigned int dgroup;
unsigned int region;
region = (start >> 24) & 0xFF;
start &= 0x00FFFFFF;
dgroup = (end >> 24) & 0xFF;
end &= 0x00FFFFFF;
if ((region >= EMI_MPU_REGION_NUM) || (dgroup > EMI_MPU_DGROUP_NUM)) {
WARN("Region:%u or dgroup:%u is wrong!\n", region, dgroup);
return -1;
}
apc &= 0x80FFFFFF;
if ((start >= DRAM_OFFSET) && (end >= start)) {
start -= DRAM_OFFSET;
end -= DRAM_OFFSET;
} else {
WARN("start:0x%lx or end:0x%lx address is wrong!\n",
start, end);
return -2;
}
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);
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));
WARN("region %d:\n", region);
WARN("\tsa:0x%lx, ea:0x%lx, apc0: 0x%lx apc1: 0x%lx\n",
sa, ea, apc[0], apc[1]);
}
}
int emi_mpu_set_protection(struct emi_region_info_t *region_info)
{
unsigned long start, end;
int i;
if (region_info->region >= EMI_MPU_REGION_NUM)
return -1;
start = (unsigned long)(region_info->start >> EMI_MPU_ALIGN_BITS) |
(region_info->region << 24);
for (i = EMI_MPU_DGROUP_NUM - 1; i >= 0; i--) {
end = (unsigned long)(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)
{
/* Set permission */
struct emi_region_info_t region_info;
/* PCE-e protect address(TODO) */
region_info.start = 0x80000000ULL;
region_info.end = 0x83FF0000ULL;
region_info.region = 1;
SET_ACCESS_PERMISSION(region_info.apc, 1,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
FORBIDDEN, FORBIDDEN, NO_PROT,
NO_PROT /*FORBIDDEN*/);
emi_mpu_set_protection(®ion_info);
/* Forbidden All */
region_info.start = 0x40000000ULL; /* dram base addr */
region_info.end = 0x1FFFF0000ULL;
region_info.region = 2;
SET_ACCESS_PERMISSION(region_info.apc, 1,
NO_PROT, NO_PROT, NO_PROT, NO_PROT,
NO_PROT, NO_PROT, NO_PROT, NO_PROT,
NO_PROT, NO_PROT, NO_PROT, NO_PROT,
NO_PROT, FORBIDDEN, NO_PROT, NO_PROT);
emi_mpu_set_protection(®ion_info);
dump_emi_mpu_regions();
}
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