arch/arm/cpu/armv7/omap5/fdt.c

   1 /*
   2  * Copyright 2016 Texas Instruments, Inc.
   3  *
   4  * SPDX-License-Identifier: GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <libfdt.h>
   9 #include <fdt_support.h>
  10 #include <malloc.h>
  11
  12 #include <asm/omap_common.h>
  13 #include <asm/arch-omap5/sys_proto.h>
  14
  15 #ifdef CONFIG_TI_SECURE_DEVICE
  16
  17 /* Give zero values if not already defined */
  18 #ifndef TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ
  19 #define TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ (0)
  20 #endif
  21 #ifndef CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ
  22 #define CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ (0)
  23 #endif
  24
  25 static u32 hs_irq_skip[] = {
  26         8,      /* Secure violation reporting interrupt */
  27         15,     /* One interrupt for SDMA by secure world */
  28         118     /* One interrupt for Crypto DMA by secure world */
  29 };
  30
  31 static int ft_hs_fixup_crossbar(void *fdt, bd_t *bd)
  32 {
  33         const char *path;
  34         int offs;
  35         int ret;
  36         int len, i, old_cnt, new_cnt;
  37         u32 *temp;
  38         const u32 *p_data;
  39
  40         /*
  41          * Increase the size of the fdt
  42          * so we have some breathing room
  43          */
  44         ret = fdt_increase_size(fdt, 512);
  45         if (ret < 0) {
  46                 printf("Could not increase size of device tree: %s\n",
  47                        fdt_strerror(ret));
  48                 return ret;
  49         }
  50
  51         /* Reserve IRQs that are used/needed by secure world */
  52         path = "/ocp/crossbar";
  53         offs = fdt_path_offset(fdt, path);
  54         if (offs < 0) {
  55                 debug("Node %s not found.\n", path);
  56                 return 0;
  57         }
  58
  59         /* Get current entries */
  60         p_data = fdt_getprop(fdt, offs, "ti,irqs-skip", &len);
  61         if (p_data)
  62                 old_cnt = len / sizeof(u32);
  63         else
  64                 old_cnt = 0;
  65
  66         new_cnt = sizeof(hs_irq_skip) /
  67                                 sizeof(hs_irq_skip[0]);
  68
  69         /* Create new/updated skip list for HS parts */
  70         temp = malloc(sizeof(u32) * (old_cnt + new_cnt));
  71         for (i = 0; i < new_cnt; i++)
  72                 temp[i] = cpu_to_fdt32(hs_irq_skip[i]);
  73         for (i = 0; i < old_cnt; i++)
  74                 temp[i + new_cnt] = p_data[i];
  75
  76         /* Blow away old data and set new data */
  77         fdt_delprop(fdt, offs, "ti,irqs-skip");
  78         ret = fdt_setprop(fdt, offs, "ti,irqs-skip",
  79                           temp,
  80                           (old_cnt + new_cnt) * sizeof(u32));
  81         free(temp);
  82
  83         /* Check if the update worked */
  84         if (ret < 0) {
  85                 printf("Could not add ti,irqs-skip property to node %s: %s\n",
  86                        path, fdt_strerror(ret));
  87                 return ret;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int ft_hs_disable_rng(void *fdt, bd_t *bd)
  94 {
  95         const char *path;
  96         int offs;
  97         int ret;
  98
  99         /* Make HW RNG reserved for secure world use */
 100         path = "/ocp/rng";
 101         offs = fdt_path_offset(fdt, path);
 102         if (offs < 0) {
 103                 debug("Node %s not found.\n", path);
 104                 return 0;
 105         }
 106         ret = fdt_setprop_string(fdt, offs,
 107                                  "status", "disabled");
 108         if (ret < 0) {
 109                 printf("Could not add status property to node %s: %s\n",
 110                        path, fdt_strerror(ret));
 111                 return ret;
 112         }
 113         return 0;
 114 }
 115
 116 #if ((TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ != 0) || \
 117     (CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ != 0))
 118 static int ft_hs_fixup_sram(void *fdt, bd_t *bd)
 119 {
 120         const char *path;
 121         int offs;
 122         int ret;
 123         u32 temp[2];
 124
 125         /*
 126          * Update SRAM reservations on secure devices. The OCMC RAM
 127          * is always reserved for secure use from the start of that
 128          * memory region
 129          */
 130         path = "/ocp/ocmcram@40300000/sram-hs";
 131         offs = fdt_path_offset(fdt, path);
 132         if (offs < 0) {
 133                 debug("Node %s not found.\n", path);
 134                 return 0;
 135         }
 136
 137         /* relative start offset */
 138         temp[0] = cpu_to_fdt32(0);
 139         /* reservation size */
 140         temp[1] = cpu_to_fdt32(max(TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ,
 141                                    CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ));
 142         fdt_delprop(fdt, offs, "reg");
 143         ret = fdt_setprop(fdt, offs, "reg", temp, 2 * sizeof(u32));
 144         if (ret < 0) {
 145                 printf("Could not add reg property to node %s: %s\n",
 146                        path, fdt_strerror(ret));
 147                 return ret;
 148         }
 149
 150         return 0;
 151 }
 152 #else
 153 static int ft_hs_fixup_sram(void *fdt, bd_t *bd) { return 0; }
 154 #endif
 155
 156 #if (CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE != 0)
 157 static int ft_hs_fixup_dram(void *fdt, bd_t *bd)
 158 {
 159         const char *path, *subpath;
 160         int offs;
 161         u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START;
 162         u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE;
 163         fdt64_t temp[2];
 164
 165         /* If start address is zero, place at end of DRAM */
 166         if (0 == sec_mem_start)
 167                 sec_mem_start =
 168                         (CONFIG_SYS_SDRAM_BASE +
 169                         (omap_sdram_size() - sec_mem_size));
 170
 171         /* Delete any original secure_reserved node */
 172         path = "/reserved-memory/secure_reserved";
 173         offs = fdt_path_offset(fdt, path);
 174         if (offs >= 0)
 175                 fdt_del_node(fdt, offs);
 176
 177         /* Add new secure_reserved node */
 178         path = "/reserved-memory";
 179         offs = fdt_path_offset(fdt, path);
 180         if (offs < 0) {
 181                 debug("Node %s not found\n", path);
 182                 path = "/";
 183                 subpath = "reserved-memory";
 184                 fdt_path_offset(fdt, path);
 185                 offs = fdt_add_subnode(fdt, offs, subpath);
 186                 if (offs < 0) {
 187                         printf("Could not create %s%s node.\n", path, subpath);
 188                         return 1;
 189                 }
 190                 path = "/reserved-memory";
 191                 offs = fdt_path_offset(fdt, path);
 192         }
 193
 194         subpath = "secure_reserved";
 195         offs = fdt_add_subnode(fdt, offs, subpath);
 196         if (offs < 0) {
 197                 printf("Could not create %s%s node.\n", path, subpath);
 198                 return 1;
 199         }
 200
 201         temp[0] = cpu_to_fdt64(((u64)sec_mem_start));
 202         temp[1] = cpu_to_fdt64(((u64)sec_mem_size));
 203         fdt_setprop_string(fdt, offs, "compatible",
 204                            "ti,dra7-secure-memory");
 205         fdt_setprop_string(fdt, offs, "status", "okay");
 206         fdt_setprop(fdt, offs, "no-map", NULL, 0);
 207         fdt_setprop(fdt, offs, "reg", temp, sizeof(temp));
 208
 209         return 0;
 210 }
 211 #else
 212 static int ft_hs_fixup_dram(void *fdt, bd_t *bd) { return 0; }
 213 #endif
 214
 215 static void ft_hs_fixups(void *fdt, bd_t *bd)
 216 {
 217         /* Check we are running on an HS/EMU device type */
 218         if (GP_DEVICE != get_device_type()) {
 219                 if ((ft_hs_fixup_crossbar(fdt, bd) == 0) &&
 220                     (ft_hs_disable_rng(fdt, bd) == 0) &&
 221                     (ft_hs_fixup_sram(fdt, bd) == 0) &&
 222                     (ft_hs_fixup_dram(fdt, bd) == 0))
 223                         return;
 224         } else {
 225                 printf("ERROR: Incorrect device type (GP) detected!");
 226         }
 227         /* Fixup failed or wrong device type */
 228         hang();
 229 }
 230 #else
 231 static void ft_hs_fixups(void *fdt, bd_t *bd)
 232 {
 233 }
 234 #endif /* #ifdef CONFIG_TI_SECURE_DEVICE */
 235
 236 /*
 237  * Place for general cpu/SoC FDT fixups. Board specific
 238  * fixups should remain in the board files which is where
 239  * this function should be called from.
 240  */
 241 void ft_cpu_setup(void *fdt, bd_t *bd)
 242 {
 243         ft_hs_fixups(fdt, bd);
 244 }