board/raspberrypi/rpi/rpi.c

   1 /*
   2  * (C) Copyright 2012-2016 Stephen Warren
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <inttypes.h>
   9 #include <config.h>
  10 #include <dm.h>
  11 #include <efi_loader.h>
  12 #include <fdt_support.h>
  13 #include <fdt_simplefb.h>
  14 #include <lcd.h>
  15 #include <memalign.h>
  16 #include <mmc.h>
  17 #include <asm/gpio.h>
  18 #include <asm/arch/mbox.h>
  19 #include <asm/arch/msg.h>
  20 #include <asm/arch/sdhci.h>
  21 #include <asm/global_data.h>
  22 #include <dm/platform_data/serial_bcm283x_mu.h>
  23 #ifdef CONFIG_ARM64
  24 #include <asm/armv8/mmu.h>
  25 #endif
  26 #include <watchdog.h>
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 /* From lowlevel_init.S */
  31 extern unsigned long fw_dtb_pointer;
  32
  33 /* TODO(sjg@chromium.org): Move these to the msg.c file */
  34 struct msg_get_arm_mem {
  35         struct bcm2835_mbox_hdr hdr;
  36         struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
  37         u32 end_tag;
  38 };
  39
  40 struct msg_get_board_rev {
  41         struct bcm2835_mbox_hdr hdr;
  42         struct bcm2835_mbox_tag_get_board_rev get_board_rev;
  43         u32 end_tag;
  44 };
  45
  46 struct msg_get_board_serial {
  47         struct bcm2835_mbox_hdr hdr;
  48         struct bcm2835_mbox_tag_get_board_serial get_board_serial;
  49         u32 end_tag;
  50 };
  51
  52 struct msg_get_mac_address {
  53         struct bcm2835_mbox_hdr hdr;
  54         struct bcm2835_mbox_tag_get_mac_address get_mac_address;
  55         u32 end_tag;
  56 };
  57
  58 struct msg_get_clock_rate {
  59         struct bcm2835_mbox_hdr hdr;
  60         struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
  61         u32 end_tag;
  62 };
  63
  64 #ifdef CONFIG_ARM64
  65 #define DTB_DIR "broadcom/"
  66 #else
  67 #define DTB_DIR ""
  68 #endif
  69
  70 /*
  71  * http://raspberryalphaomega.org.uk/2013/02/06/automatic-raspberry-pi-board-revision-detection-model-a-b1-and-b2/
  72  * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=32733
  73  * http://git.drogon.net/?p=wiringPi;a=blob;f=wiringPi/wiringPi.c;h=503151f61014418b9c42f4476a6086f75cd4e64b;hb=refs/heads/master#l922
  74  *
  75  * In http://lists.denx.de/pipermail/u-boot/2016-January/243752.html
  76  * ("[U-Boot] [PATCH] rpi: fix up Model B entries") Dom Cobley at the RPi
  77  * Foundation stated that the following source was accurate:
  78  * https://github.com/AndrewFromMelbourne/raspberry_pi_revision
  79  */
  80 struct rpi_model {
  81         const char *name;
  82         const char *fdtfile;
  83         bool has_onboard_eth;
  84 };
  85
  86 static const struct rpi_model rpi_model_unknown = {
  87         "Unknown model",
  88         DTB_DIR "bcm283x-rpi-other.dtb",
  89         false,
  90 };
  91
  92 static const struct rpi_model rpi_models_new_scheme[] = {
  93         [0x4] = {
  94                 "2 Model B",
  95                 DTB_DIR "bcm2836-rpi-2-b.dtb",
  96                 true,
  97         },
  98         [0x8] = {
  99                 "3 Model B",
 100                 DTB_DIR "bcm2837-rpi-3-b.dtb",
 101                 true,
 102         },
 103         [0x9] = {
 104                 "Zero",
 105                 DTB_DIR "bcm2835-rpi-zero.dtb",
 106                 false,
 107         },
 108         [0xC] = {
 109                 "Zero W",
 110                 DTB_DIR "bcm2835-rpi-zero-w.dtb",
 111                 false,
 112         },
 113 };
 114
 115 static const struct rpi_model rpi_models_old_scheme[] = {
 116         [0x2] = {
 117                 "Model B",
 118                 DTB_DIR "bcm2835-rpi-b.dtb",
 119                 true,
 120         },
 121         [0x3] = {
 122                 "Model B",
 123                 DTB_DIR "bcm2835-rpi-b.dtb",
 124                 true,
 125         },
 126         [0x4] = {
 127                 "Model B rev2",
 128                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 129                 true,
 130         },
 131         [0x5] = {
 132                 "Model B rev2",
 133                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 134                 true,
 135         },
 136         [0x6] = {
 137                 "Model B rev2",
 138                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 139                 true,
 140         },
 141         [0x7] = {
 142                 "Model A",
 143                 DTB_DIR "bcm2835-rpi-a.dtb",
 144                 false,
 145         },
 146         [0x8] = {
 147                 "Model A",
 148                 DTB_DIR "bcm2835-rpi-a.dtb",
 149                 false,
 150         },
 151         [0x9] = {
 152                 "Model A",
 153                 DTB_DIR "bcm2835-rpi-a.dtb",
 154                 false,
 155         },
 156         [0xd] = {
 157                 "Model B rev2",
 158                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 159                 true,
 160         },
 161         [0xe] = {
 162                 "Model B rev2",
 163                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 164                 true,
 165         },
 166         [0xf] = {
 167                 "Model B rev2",
 168                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 169                 true,
 170         },
 171         [0x10] = {
 172                 "Model B+",
 173                 DTB_DIR "bcm2835-rpi-b-plus.dtb",
 174                 true,
 175         },
 176         [0x11] = {
 177                 "Compute Module",
 178                 DTB_DIR "bcm2835-rpi-cm.dtb",
 179                 false,
 180         },
 181         [0x12] = {
 182                 "Model A+",
 183                 DTB_DIR "bcm2835-rpi-a-plus.dtb",
 184                 false,
 185         },
 186         [0x13] = {
 187                 "Model B+",
 188                 DTB_DIR "bcm2835-rpi-b-plus.dtb",
 189                 true,
 190         },
 191         [0x14] = {
 192                 "Compute Module",
 193                 DTB_DIR "bcm2835-rpi-cm.dtb",
 194                 false,
 195         },
 196         [0x15] = {
 197                 "Model A+",
 198                 DTB_DIR "bcm2835-rpi-a-plus.dtb",
 199                 false,
 200         },
 201 };
 202
 203 static uint32_t revision;
 204 static uint32_t rev_scheme;
 205 static uint32_t rev_type;
 206 static const struct rpi_model *model;
 207
 208 #ifdef CONFIG_ARM64
 209 static struct mm_region bcm2837_mem_map[] = {
 210         {
 211                 .virt = 0x00000000UL,
 212                 .phys = 0x00000000UL,
 213                 .size = 0x3f000000UL,
 214                 .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 215                          PTE_BLOCK_INNER_SHARE
 216         }, {
 217                 .virt = 0x3f000000UL,
 218                 .phys = 0x3f000000UL,
 219                 .size = 0x01000000UL,
 220                 .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
 221                          PTE_BLOCK_NON_SHARE |
 222                          PTE_BLOCK_PXN | PTE_BLOCK_UXN
 223         }, {
 224                 /* List terminator */
 225                 0,
 226         }
 227 };
 228
 229 struct mm_region *mem_map = bcm2837_mem_map;
 230 #endif
 231
 232 int dram_init(void)
 233 {
 234         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1);
 235         int ret;
 236
 237         BCM2835_MBOX_INIT_HDR(msg);
 238         BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
 239
 240         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 241         if (ret) {
 242                 printf("bcm2835: Could not query ARM memory size\n");
 243                 return -1;
 244         }
 245
 246         gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
 247
 248         return 0;
 249 }
 250
 251 static void set_fdtfile(void)
 252 {
 253         const char *fdtfile;
 254
 255         if (env_get("fdtfile"))
 256                 return;
 257
 258         fdtfile = model->fdtfile;
 259         env_set("fdtfile", fdtfile);
 260 }
 261
 262 /*
 263  * If the firmware provided a valid FDT at boot time, let's expose it in
 264  * ${fdt_addr} so it may be passed unmodified to the kernel.
 265  */
 266 static void set_fdt_addr(void)
 267 {
 268         if (env_get("fdt_addr"))
 269                 return;
 270
 271         if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
 272                 return;
 273
 274         env_set_hex("fdt_addr", fw_dtb_pointer);
 275 }
 276
 277 /*
 278  * Prevent relocation from stomping on a firmware provided FDT blob.
 279  */
 280 unsigned long board_get_usable_ram_top(unsigned long total_size)
 281 {
 282         if ((gd->ram_top - fw_dtb_pointer) > SZ_64M)
 283                 return gd->ram_top;
 284         return fw_dtb_pointer & ~0xffff;
 285 }
 286
 287 static void set_usbethaddr(void)
 288 {
 289         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
 290         int ret;
 291
 292         if (!model->has_onboard_eth)
 293                 return;
 294
 295         if (env_get("usbethaddr"))
 296                 return;
 297
 298         BCM2835_MBOX_INIT_HDR(msg);
 299         BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
 300
 301         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 302         if (ret) {
 303                 printf("bcm2835: Could not query MAC address\n");
 304                 /* Ignore error; not critical */
 305                 return;
 306         }
 307
 308         eth_env_set_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
 309
 310         if (!env_get("ethaddr"))
 311                 env_set("ethaddr", env_get("usbethaddr"));
 312
 313         return;
 314 }
 315
 316 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 317 static void set_board_info(void)
 318 {
 319         char s[11];
 320
 321         snprintf(s, sizeof(s), "0x%X", revision);
 322         env_set("board_revision", s);
 323         snprintf(s, sizeof(s), "%d", rev_scheme);
 324         env_set("board_rev_scheme", s);
 325         /* Can't rename this to board_rev_type since it's an ABI for scripts */
 326         snprintf(s, sizeof(s), "0x%X", rev_type);
 327         env_set("board_rev", s);
 328         env_set("board_name", model->name);
 329 }
 330 #endif /* CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG */
 331
 332 static void set_serial_number(void)
 333 {
 334         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_serial, msg, 1);
 335         int ret;
 336         char serial_string[17] = { 0 };
 337
 338         if (env_get("serial#"))
 339                 return;
 340
 341         BCM2835_MBOX_INIT_HDR(msg);
 342         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg->get_board_serial, GET_BOARD_SERIAL);
 343
 344         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 345         if (ret) {
 346                 printf("bcm2835: Could not query board serial\n");
 347                 /* Ignore error; not critical */
 348                 return;
 349         }
 350
 351         snprintf(serial_string, sizeof(serial_string), "%016" PRIx64,
 352                  msg->get_board_serial.body.resp.serial);
 353         env_set("serial#", serial_string);
 354 }
 355
 356 int misc_init_r(void)
 357 {
 358         set_fdt_addr();
 359         set_fdtfile();
 360         set_usbethaddr();
 361 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 362         set_board_info();
 363 #endif
 364         set_serial_number();
 365
 366         return 0;
 367 }
 368
 369 static void get_board_rev(void)
 370 {
 371         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
 372         int ret;
 373         const struct rpi_model *models;
 374         uint32_t models_count;
 375
 376         BCM2835_MBOX_INIT_HDR(msg);
 377         BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);
 378
 379         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 380         if (ret) {
 381                 printf("bcm2835: Could not query board revision\n");
 382                 /* Ignore error; not critical */
 383                 return;
 384         }
 385
 386         /*
 387          * For details of old-vs-new scheme, see:
 388          * https://github.com/pimoroni/RPi.version/blob/master/RPi/version.py
 389          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=99293&p=690282
 390          * (a few posts down)
 391          *
 392          * For the RPi 1, bit 24 is the "warranty bit", so we mask off just the
 393          * lower byte to use as the board rev:
 394          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
 395          * http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
 396          */
 397         revision = msg->get_board_rev.body.resp.rev;
 398         if (revision & 0x800000) {
 399                 rev_scheme = 1;
 400                 rev_type = (revision >> 4) & 0xff;
 401                 models = rpi_models_new_scheme;
 402                 models_count = ARRAY_SIZE(rpi_models_new_scheme);
 403         } else {
 404                 rev_scheme = 0;
 405                 rev_type = revision & 0xff;
 406                 models = rpi_models_old_scheme;
 407                 models_count = ARRAY_SIZE(rpi_models_old_scheme);
 408         }
 409         if (rev_type >= models_count) {
 410                 printf("RPI: Board rev 0x%x outside known range\n", rev_type);
 411                 model = &rpi_model_unknown;
 412         } else if (!models[rev_type].name) {
 413                 printf("RPI: Board rev 0x%x unknown\n", rev_type);
 414                 model = &rpi_model_unknown;
 415         } else {
 416                 model = &models[rev_type];
 417         }
 418
 419         printf("RPI %s (0x%x)\n", model->name, revision);
 420 }
 421
 422 #ifndef CONFIG_PL01X_SERIAL
 423 static bool rpi_is_serial_active(void)
 424 {
 425         int serial_gpio = 15;
 426         struct udevice *dev;
 427
 428         /*
 429          * The RPi3 disables the mini uart by default. The easiest way to find
 430          * out whether it is available is to check if the RX pin is muxed.
 431          */
 432
 433         if (uclass_first_device(UCLASS_GPIO, &dev) || !dev)
 434                 return true;
 435
 436         if (bcm2835_gpio_get_func_id(dev, serial_gpio) != BCM2835_GPIO_ALT5)
 437                 return false;
 438
 439         return true;
 440 }
 441
 442 /* Disable mini-UART I/O if it's not pinmuxed to our pins.
 443  * The firmware only enables it if explicitly done in config.txt: enable_uart=1
 444  */
 445 static void rpi_disable_inactive_uart(void)
 446 {
 447         struct udevice *dev;
 448         struct bcm283x_mu_serial_platdata *plat;
 449
 450         if (uclass_get_device_by_driver(UCLASS_SERIAL,
 451                                         DM_GET_DRIVER(serial_bcm283x_mu),
 452                                         &dev) || !dev)
 453                 return;
 454
 455         if (!rpi_is_serial_active()) {
 456                 plat = dev_get_platdata(dev);
 457                 plat->disabled = true;
 458         }
 459 }
 460 #endif
 461
 462 int board_init(void)
 463 {
 464 #ifdef CONFIG_HW_WATCHDOG
 465         hw_watchdog_init();
 466 #endif
 467 #ifndef CONFIG_PL01X_SERIAL
 468         rpi_disable_inactive_uart();
 469 #endif
 470
 471         get_board_rev();
 472
 473         gd->bd->bi_boot_params = 0x100;
 474
 475         return bcm2835_power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
 476 }
 477
 478 /*
 479  * If the firmware passed a device tree use it for U-Boot.
 480  */
 481 void *board_fdt_blob_setup(void)
 482 {
 483         if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
 484                 return NULL;
 485         return (void *)fw_dtb_pointer;
 486 }
 487
 488 int ft_board_setup(void *blob, bd_t *bd)
 489 {
 490         /*
 491          * For now, we simply always add the simplefb DT node. Later, we
 492          * should be more intelligent, and e.g. only do this if no enabled DT
 493          * node exists for the "real" graphics driver.
 494          */
 495         lcd_dt_simplefb_add_node(blob);
 496
 497 #ifdef CONFIG_EFI_LOADER
 498         /* Reserve the spin table */
 499         efi_add_memory_map(0, 1, EFI_RESERVED_MEMORY_TYPE, 0);
 500 #endif
 501
 502         return 0;
 503 }