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