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 };
 109
 110 static const struct rpi_model rpi_models_old_scheme[] = {
 111         [0x2] = {
 112                 "Model B",
 113                 DTB_DIR "bcm2835-rpi-b.dtb",
 114                 true,
 115         },
 116         [0x3] = {
 117                 "Model B",
 118                 DTB_DIR "bcm2835-rpi-b.dtb",
 119                 true,
 120         },
 121         [0x4] = {
 122                 "Model B rev2",
 123                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 124                 true,
 125         },
 126         [0x5] = {
 127                 "Model B rev2",
 128                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 129                 true,
 130         },
 131         [0x6] = {
 132                 "Model B rev2",
 133                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 134                 true,
 135         },
 136         [0x7] = {
 137                 "Model A",
 138                 DTB_DIR "bcm2835-rpi-a.dtb",
 139                 false,
 140         },
 141         [0x8] = {
 142                 "Model A",
 143                 DTB_DIR "bcm2835-rpi-a.dtb",
 144                 false,
 145         },
 146         [0x9] = {
 147                 "Model A",
 148                 DTB_DIR "bcm2835-rpi-a.dtb",
 149                 false,
 150         },
 151         [0xd] = {
 152                 "Model B rev2",
 153                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 154                 true,
 155         },
 156         [0xe] = {
 157                 "Model B rev2",
 158                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 159                 true,
 160         },
 161         [0xf] = {
 162                 "Model B rev2",
 163                 DTB_DIR "bcm2835-rpi-b-rev2.dtb",
 164                 true,
 165         },
 166         [0x10] = {
 167                 "Model B+",
 168                 DTB_DIR "bcm2835-rpi-b-plus.dtb",
 169                 true,
 170         },
 171         [0x11] = {
 172                 "Compute Module",
 173                 DTB_DIR "bcm2835-rpi-cm.dtb",
 174                 false,
 175         },
 176         [0x12] = {
 177                 "Model A+",
 178                 DTB_DIR "bcm2835-rpi-a-plus.dtb",
 179                 false,
 180         },
 181         [0x13] = {
 182                 "Model B+",
 183                 DTB_DIR "bcm2835-rpi-b-plus.dtb",
 184                 true,
 185         },
 186         [0x14] = {
 187                 "Compute Module",
 188                 DTB_DIR "bcm2835-rpi-cm.dtb",
 189                 false,
 190         },
 191         [0x15] = {
 192                 "Model A+",
 193                 DTB_DIR "bcm2835-rpi-a-plus.dtb",
 194                 false,
 195         },
 196 };
 197
 198 static uint32_t revision;
 199 static uint32_t rev_scheme;
 200 static uint32_t rev_type;
 201 static const struct rpi_model *model;
 202
 203 #ifdef CONFIG_ARM64
 204 static struct mm_region bcm2837_mem_map[] = {
 205         {
 206                 .virt = 0x00000000UL,
 207                 .phys = 0x00000000UL,
 208                 .size = 0x3f000000UL,
 209                 .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 210                          PTE_BLOCK_INNER_SHARE
 211         }, {
 212                 .virt = 0x3f000000UL,
 213                 .phys = 0x3f000000UL,
 214                 .size = 0x01000000UL,
 215                 .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
 216                          PTE_BLOCK_NON_SHARE |
 217                          PTE_BLOCK_PXN | PTE_BLOCK_UXN
 218         }, {
 219                 /* List terminator */
 220                 0,
 221         }
 222 };
 223
 224 struct mm_region *mem_map = bcm2837_mem_map;
 225 #endif
 226
 227 int dram_init(void)
 228 {
 229         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1);
 230         int ret;
 231
 232         BCM2835_MBOX_INIT_HDR(msg);
 233         BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
 234
 235         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 236         if (ret) {
 237                 printf("bcm2835: Could not query ARM memory size\n");
 238                 return -1;
 239         }
 240
 241         gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
 242
 243         return 0;
 244 }
 245
 246 static void set_fdtfile(void)
 247 {
 248         const char *fdtfile;
 249
 250         if (getenv("fdtfile"))
 251                 return;
 252
 253         fdtfile = model->fdtfile;
 254         env_set("fdtfile", fdtfile);
 255 }
 256
 257 /*
 258  * If the firmware provided a valid FDT at boot time, let's expose it in
 259  * ${fdt_addr} so it may be passed unmodified to the kernel.
 260  */
 261 static void set_fdt_addr(void)
 262 {
 263         if (getenv("fdt_addr"))
 264                 return;
 265
 266         if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
 267                 return;
 268
 269         env_set_hex("fdt_addr", fw_dtb_pointer);
 270 }
 271
 272 /*
 273  * Prevent relocation from stomping on a firmware provided FDT blob.
 274  */
 275 unsigned long board_get_usable_ram_top(unsigned long total_size)
 276 {
 277         if ((gd->ram_top - fw_dtb_pointer) > SZ_64M)
 278                 return gd->ram_top;
 279         return fw_dtb_pointer & ~0xffff;
 280 }
 281
 282 static void set_usbethaddr(void)
 283 {
 284         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
 285         int ret;
 286
 287         if (!model->has_onboard_eth)
 288                 return;
 289
 290         if (getenv("usbethaddr"))
 291                 return;
 292
 293         BCM2835_MBOX_INIT_HDR(msg);
 294         BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
 295
 296         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 297         if (ret) {
 298                 printf("bcm2835: Could not query MAC address\n");
 299                 /* Ignore error; not critical */
 300                 return;
 301         }
 302
 303         eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
 304
 305         if (!getenv("ethaddr"))
 306                 env_set("ethaddr", getenv("usbethaddr"));
 307
 308         return;
 309 }
 310
 311 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 312 static void set_board_info(void)
 313 {
 314         char s[11];
 315
 316         snprintf(s, sizeof(s), "0x%X", revision);
 317         env_set("board_revision", s);
 318         snprintf(s, sizeof(s), "%d", rev_scheme);
 319         env_set("board_rev_scheme", s);
 320         /* Can't rename this to board_rev_type since it's an ABI for scripts */
 321         snprintf(s, sizeof(s), "0x%X", rev_type);
 322         env_set("board_rev", s);
 323         env_set("board_name", model->name);
 324 }
 325 #endif /* CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG */
 326
 327 static void set_serial_number(void)
 328 {
 329         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_serial, msg, 1);
 330         int ret;
 331         char serial_string[17] = { 0 };
 332
 333         if (getenv("serial#"))
 334                 return;
 335
 336         BCM2835_MBOX_INIT_HDR(msg);
 337         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg->get_board_serial, GET_BOARD_SERIAL);
 338
 339         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 340         if (ret) {
 341                 printf("bcm2835: Could not query board serial\n");
 342                 /* Ignore error; not critical */
 343                 return;
 344         }
 345
 346         snprintf(serial_string, sizeof(serial_string), "%016" PRIx64,
 347                  msg->get_board_serial.body.resp.serial);
 348         env_set("serial#", serial_string);
 349 }
 350
 351 int misc_init_r(void)
 352 {
 353         set_fdt_addr();
 354         set_fdtfile();
 355         set_usbethaddr();
 356 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 357         set_board_info();
 358 #endif
 359         set_serial_number();
 360
 361         return 0;
 362 }
 363
 364 static void get_board_rev(void)
 365 {
 366         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
 367         int ret;
 368         const struct rpi_model *models;
 369         uint32_t models_count;
 370
 371         BCM2835_MBOX_INIT_HDR(msg);
 372         BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);
 373
 374         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 375         if (ret) {
 376                 printf("bcm2835: Could not query board revision\n");
 377                 /* Ignore error; not critical */
 378                 return;
 379         }
 380
 381         /*
 382          * For details of old-vs-new scheme, see:
 383          * https://github.com/pimoroni/RPi.version/blob/master/RPi/version.py
 384          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=99293&p=690282
 385          * (a few posts down)
 386          *
 387          * For the RPi 1, bit 24 is the "warranty bit", so we mask off just the
 388          * lower byte to use as the board rev:
 389          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
 390          * http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
 391          */
 392         revision = msg->get_board_rev.body.resp.rev;
 393         if (revision & 0x800000) {
 394                 rev_scheme = 1;
 395                 rev_type = (revision >> 4) & 0xff;
 396                 models = rpi_models_new_scheme;
 397                 models_count = ARRAY_SIZE(rpi_models_new_scheme);
 398         } else {
 399                 rev_scheme = 0;
 400                 rev_type = revision & 0xff;
 401                 models = rpi_models_old_scheme;
 402                 models_count = ARRAY_SIZE(rpi_models_old_scheme);
 403         }
 404         if (rev_type >= models_count) {
 405                 printf("RPI: Board rev 0x%x outside known range\n", rev_type);
 406                 model = &rpi_model_unknown;
 407         } else if (!models[rev_type].name) {
 408                 printf("RPI: Board rev 0x%x unknown\n", rev_type);
 409                 model = &rpi_model_unknown;
 410         } else {
 411                 model = &models[rev_type];
 412         }
 413
 414         printf("RPI %s (0x%x)\n", model->name, revision);
 415 }
 416
 417 #ifndef CONFIG_PL01X_SERIAL
 418 static bool rpi_is_serial_active(void)
 419 {
 420         int serial_gpio = 15;
 421         struct udevice *dev;
 422
 423         /*
 424          * The RPi3 disables the mini uart by default. The easiest way to find
 425          * out whether it is available is to check if the RX pin is muxed.
 426          */
 427
 428         if (uclass_first_device(UCLASS_GPIO, &dev) || !dev)
 429                 return true;
 430
 431         if (bcm2835_gpio_get_func_id(dev, serial_gpio) != BCM2835_GPIO_ALT5)
 432                 return false;
 433
 434         return true;
 435 }
 436
 437 /* Disable mini-UART I/O if it's not pinmuxed to our pins.
 438  * The firmware only enables it if explicitly done in config.txt: enable_uart=1
 439  */
 440 static void rpi_disable_inactive_uart(void)
 441 {
 442         struct udevice *dev;
 443         struct bcm283x_mu_serial_platdata *plat;
 444
 445         if (uclass_get_device_by_driver(UCLASS_SERIAL,
 446                                         DM_GET_DRIVER(serial_bcm283x_mu),
 447                                         &dev) || !dev)
 448                 return;
 449
 450         if (!rpi_is_serial_active()) {
 451                 plat = dev_get_platdata(dev);
 452                 plat->disabled = true;
 453         }
 454 }
 455 #endif
 456
 457 int board_init(void)
 458 {
 459 #ifdef CONFIG_HW_WATCHDOG
 460         hw_watchdog_init();
 461 #endif
 462 #ifndef CONFIG_PL01X_SERIAL
 463         rpi_disable_inactive_uart();
 464 #endif
 465
 466         get_board_rev();
 467
 468         gd->bd->bi_boot_params = 0x100;
 469
 470         return bcm2835_power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
 471 }
 472
 473 /*
 474  * If the firmware passed a device tree use it for U-Boot.
 475  */
 476 void *board_fdt_blob_setup(void)
 477 {
 478         if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
 479                 return NULL;
 480         return (void *)fw_dtb_pointer;
 481 }
 482
 483 int ft_board_setup(void *blob, bd_t *bd)
 484 {
 485         /*
 486          * For now, we simply always add the simplefb DT node. Later, we
 487          * should be more intelligent, and e.g. only do this if no enabled DT
 488          * node exists for the "real" graphics driver.
 489          */
 490         lcd_dt_simplefb_add_node(blob);
 491
 492 #ifdef CONFIG_EFI_LOADER
 493         /* Reserve the spin table */
 494         efi_add_memory_map(0, 1, EFI_RESERVED_MEMORY_TYPE, 0);
 495 #endif
 496
 497         return 0;
 498 }