arch/arm/mach-omap2/omap5/sec-fxns.c

   1 /*
   2  *
   3  * Security related functions for OMAP5 class devices
   4  *
   5  * (C) Copyright 2016
   6  * Texas Instruments, <www.ti.com>
   7  *
   8  * Daniel Allred <d-allred@ti.com>
   9  * Harinarayan Bhatta <harinarayan@ti.com>
  10  *
  11  * SPDX-License-Identifier: GPL-2.0+
  12  */
  13
  14 #include <common.h>
  15 #include <stdarg.h>
  16
  17 #include <asm/arch/sys_proto.h>
  18 #include <asm/omap_common.h>
  19 #include <asm/omap_sec_common.h>
  20 #include <asm/spl.h>
  21 #include <spl.h>
  22 #include <asm/cache.h>
  23 #include <mapmem.h>
  24 #include <tee/optee.h>
  25
  26 /* Index for signature PPA-based TI HAL APIs */
  27 #define PPA_HAL_SERVICES_START_INDEX        (0x200)
  28 #define PPA_SERV_HAL_TEE_LOAD_MASTER        (PPA_HAL_SERVICES_START_INDEX + 23)
  29 #define PPA_SERV_HAL_TEE_LOAD_SLAVE         (PPA_HAL_SERVICES_START_INDEX + 24)
  30 #define PPA_SERV_HAL_SETUP_SEC_RESVD_REGION (PPA_HAL_SERVICES_START_INDEX + 25)
  31 #define PPA_SERV_HAL_SETUP_EMIF_FW_REGION   (PPA_HAL_SERVICES_START_INDEX + 26)
  32 #define PPA_SERV_HAL_LOCK_EMIF_FW           (PPA_HAL_SERVICES_START_INDEX + 27)
  33
  34 int tee_loaded = 0;
  35
  36 /* Argument for PPA_SERV_HAL_TEE_LOAD_MASTER */
  37 struct ppa_tee_load_info {
  38         u32 tee_sec_mem_start; /* Physical start address reserved for TEE */
  39         u32 tee_sec_mem_size;  /* Size of the memory reserved for TEE */
  40         u32 tee_cert_start;    /* Address where signed TEE binary is loaded */
  41         u32 tee_cert_size;     /* Size of TEE certificate (signed binary) */
  42         u32 tee_jump_addr;     /* Address to jump to start TEE execution */
  43         u32 tee_arg0;          /* argument to TEE jump function, in r0 */
  44 };
  45
  46 static u32 get_sec_mem_start(void)
  47 {
  48         u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START;
  49         u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE;
  50         /*
  51          * Total reserved region is all contiguous with protected
  52          * region coming first, followed by the non-secure region.
  53          * If 0x0 start address is given, we simply put the reserved
  54          * region at the end of the external DRAM.
  55          */
  56         if (sec_mem_start == 0)
  57                 sec_mem_start =
  58                         (CONFIG_SYS_SDRAM_BASE +
  59                         (omap_sdram_size() - sec_mem_size));
  60         return sec_mem_start;
  61 }
  62
  63 int secure_emif_firewall_setup(uint8_t region_num, uint32_t start_addr,
  64                                uint32_t size, uint32_t access_perm,
  65                                uint32_t initiator_perm)
  66 {
  67         int result = 1;
  68
  69         /*
  70          * Call PPA HAL API to do any other general firewall
  71          * configuration for regions 1-6 of the EMIF firewall.
  72          */
  73         debug("%s: regionNum = %x, startAddr = %x, size = %x", __func__,
  74               region_num, start_addr, size);
  75
  76         result = secure_rom_call(
  77                         PPA_SERV_HAL_SETUP_EMIF_FW_REGION, 0, 0, 4,
  78                         (start_addr & 0xFFFFFFF0) | (region_num & 0x0F),
  79                         size, access_perm, initiator_perm);
  80
  81         if (result != 0) {
  82                 puts("Secure EMIF Firewall Setup failed!\n");
  83                 debug("Return Value = %x\n", result);
  84         }
  85
  86         return result;
  87 }
  88
  89 #if     (CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE <  \
  90         CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE)
  91 #error  "TI Secure EMIF: Protected size cannot be larger than total size."
  92 #endif
  93 int secure_emif_reserve(void)
  94 {
  95         int result = 1;
  96         u32 sec_mem_start = get_sec_mem_start();
  97         u32 sec_prot_size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
  98
  99         /* If there is no protected region, there is no reservation to make */
 100         if (sec_prot_size == 0)
 101                 return 0;
 102
 103         /*
 104          * Call PPA HAL API to reserve a chunk of EMIF SDRAM
 105          * for secure world use. This region should be carved out
 106          * from use by any public code. EMIF firewall region 7
 107          * will be used to protect this block of memory.
 108          */
 109         result = secure_rom_call(
 110                         PPA_SERV_HAL_SETUP_SEC_RESVD_REGION,
 111                         0, 0, 2, sec_mem_start, sec_prot_size);
 112
 113         if (result != 0) {
 114                 puts("SDRAM Firewall: Secure memory reservation failed!\n");
 115                 debug("Return Value = %x\n", result);
 116         }
 117
 118         return result;
 119 }
 120
 121 int secure_emif_firewall_lock(void)
 122 {
 123         int result = 1;
 124
 125         /*
 126          * Call PPA HAL API to lock the EMIF firewall configurations.
 127          * After this API is called, none of the PPA HAL APIs for
 128          * configuring the EMIF firewalls will be usable again (that
 129          * is, calls to those APIs will return failure and have no
 130          * effect).
 131          */
 132
 133         result = secure_rom_call(
 134                         PPA_SERV_HAL_LOCK_EMIF_FW,
 135                         0, 0, 0);
 136
 137         if (result != 0) {
 138                 puts("Secure EMIF Firewall Lock failed!\n");
 139                 debug("Return Value = %x\n", result);
 140         }
 141
 142         return result;
 143 }
 144
 145 static struct ppa_tee_load_info tee_info __aligned(ARCH_DMA_MINALIGN);
 146
 147 int secure_tee_install(u32 addr)
 148 {
 149         struct optee_header *hdr;
 150         void *loadptr;
 151         u32 tee_file_size;
 152         u32 sec_mem_start = get_sec_mem_start();
 153         const u32 size = CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE;
 154         u32 *smc_cpu1_params;
 155         u32 ret;
 156
 157         /* If there is no protected region, there is no place to put the TEE */
 158         if (size == 0) {
 159                 printf("Error loading TEE, no protected memory region available\n");
 160                 return -ENOBUFS;
 161         }
 162
 163         hdr = (struct optee_header *)map_sysmem(addr, sizeof(struct optee_header));
 164         /* 280 bytes = size of signature */
 165         tee_file_size = hdr->init_size + hdr->paged_size +
 166                         sizeof(struct optee_header) + 280;
 167
 168         if ((hdr->magic != OPTEE_MAGIC) ||
 169             (hdr->version != OPTEE_VERSION) ||
 170             (hdr->init_load_addr_hi != 0) ||
 171             (hdr->init_load_addr_lo < (sec_mem_start + sizeof(struct optee_header))) ||
 172             (tee_file_size > size) ||
 173             ((hdr->init_load_addr_lo + tee_file_size - 1) >
 174              (sec_mem_start + size - 1))) {
 175                 printf("Error in TEE header. Check load address and sizes\n");
 176                 unmap_sysmem(hdr);
 177                 return CMD_RET_FAILURE;
 178         }
 179
 180         tee_info.tee_sec_mem_start = sec_mem_start;
 181         tee_info.tee_sec_mem_size = size;
 182         tee_info.tee_jump_addr = hdr->init_load_addr_lo;
 183         tee_info.tee_cert_start = addr;
 184         tee_info.tee_cert_size = tee_file_size;
 185         tee_info.tee_arg0 = hdr->init_size + tee_info.tee_jump_addr;
 186         unmap_sysmem(hdr);
 187         loadptr = map_sysmem(addr, tee_file_size);
 188
 189         debug("tee_info.tee_sec_mem_start= %08X\n", tee_info.tee_sec_mem_start);
 190         debug("tee_info.tee_sec_mem_size = %08X\n", tee_info.tee_sec_mem_size);
 191         debug("tee_info.tee_jump_addr = %08X\n", tee_info.tee_jump_addr);
 192         debug("tee_info.tee_cert_start = %08X\n", tee_info.tee_cert_start);
 193         debug("tee_info.tee_cert_size = %08X\n", tee_info.tee_cert_size);
 194         debug("tee_info.tee_arg0 = %08X\n", tee_info.tee_arg0);
 195         debug("tee_file_size = %d\n", tee_file_size);
 196
 197 #if !defined(CONFIG_SYS_DCACHE_OFF)
 198         flush_dcache_range(
 199                 rounddown((u32)loadptr, ARCH_DMA_MINALIGN),
 200                 roundup((u32)loadptr + tee_file_size, ARCH_DMA_MINALIGN));
 201
 202         flush_dcache_range((u32)&tee_info, (u32)&tee_info +
 203                         roundup(sizeof(tee_info), ARCH_DMA_MINALIGN));
 204 #endif
 205         unmap_sysmem(loadptr);
 206
 207         ret = secure_rom_call(PPA_SERV_HAL_TEE_LOAD_MASTER, 0, 0, 1, &tee_info);
 208         if (ret) {
 209                 printf("TEE_LOAD_MASTER Failed\n");
 210                 return ret;
 211         }
 212         printf("TEE_LOAD_MASTER Done\n");
 213
 214         if (!is_dra72x()) {
 215                 /* Reuse the tee_info buffer for SMC params */
 216                 smc_cpu1_params = (u32 *)&tee_info;
 217                 smc_cpu1_params[0] = 0;
 218 #if !defined(CONFIG_SYS_DCACHE_OFF)
 219                 flush_dcache_range((u32)smc_cpu1_params, (u32)smc_cpu1_params +
 220                                 roundup(sizeof(u32), ARCH_DMA_MINALIGN));
 221 #endif
 222                 ret = omap_smc_sec_cpu1(PPA_SERV_HAL_TEE_LOAD_SLAVE, 0, 0,
 223                                 smc_cpu1_params);
 224                 if (ret) {
 225                         printf("TEE_LOAD_SLAVE Failed\n");
 226                         return ret;
 227                 }
 228                 printf("TEE_LOAD_SLAVE Done\n");
 229         }
 230
 231         tee_loaded = 1;
 232
 233         return 0;
 234 }