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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)
- {
- struct emi_region_info_t region_info;
- /* reserve region 0 for future use */
- /* PCI-e protect address(64MB) */
- region_info.start = 0xC0000000ULL;
- region_info.end = 0xC3FFFFFFULL;
- 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);
- emi_mpu_set_protection(®ion_info);
- /* SCP protect address */
- region_info.start = 0x50000000ULL;
- region_info.end = 0x513FFFFFULL;
- region_info.region = 2;
- SET_ACCESS_PERMISSION(region_info.apc, 1,
- FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
- FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
- FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
- NO_PROT, FORBIDDEN, FORBIDDEN, NO_PROT);
- emi_mpu_set_protection(®ion_info);
- /* Forbidden All */
- region_info.start = 0x40000000ULL; /* dram base addr */
- region_info.end = 0x1FFFFFFFFULL;
- region_info.region = 3;
- SET_ACCESS_PERMISSION(region_info.apc, 1,
- FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
- FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
- FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN,
- FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROT);
- emi_mpu_set_protection(®ion_info);
- dump_emi_mpu_regions();
- }
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