LXR uboot/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/sdhci.h>
  20#include <asm/global_data.h>
  21#include <dm/platform_data/serial_bcm283x_mu.h>
  22#ifdef CONFIG_ARM64
  23#include <asm/armv8/mmu.h>
  24#endif
  25
  26DECLARE_GLOBAL_DATA_PTR;
  27
  28/* From lowlevel_init.S */
  29extern unsigned long fw_dtb_pointer;
  30
  31
  32struct msg_get_arm_mem {
  33        struct bcm2835_mbox_hdr hdr;
  34        struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
  35        u32 end_tag;
  36};
  37
  38struct msg_get_board_rev {
  39        struct bcm2835_mbox_hdr hdr;
  40        struct bcm2835_mbox_tag_get_board_rev get_board_rev;
  41        u32 end_tag;
  42};
  43
  44struct msg_get_board_serial {
  45        struct bcm2835_mbox_hdr hdr;
  46        struct bcm2835_mbox_tag_get_board_serial get_board_serial;
  47        u32 end_tag;
  48};
  49
  50struct msg_get_mac_address {
  51        struct bcm2835_mbox_hdr hdr;
  52        struct bcm2835_mbox_tag_get_mac_address get_mac_address;
  53        u32 end_tag;
  54};
  55
  56struct msg_set_power_state {
  57        struct bcm2835_mbox_hdr hdr;
  58        struct bcm2835_mbox_tag_set_power_state set_power_state;
  59        u32 end_tag;
  60};
  61
  62struct msg_get_clock_rate {
  63        struct bcm2835_mbox_hdr hdr;
  64        struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
  65        u32 end_tag;
  66};
  67
  68/*
  69 * http://raspberryalphaomega.org.uk/2013/02/06/automatic-raspberry-pi-board-revision-detection-model-a-b1-and-b2/
  70 * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=32733
  71 * http://git.drogon.net/?p=wiringPi;a=blob;f=wiringPi/wiringPi.c;h=503151f61014418b9c42f4476a6086f75cd4e64b;hb=refs/heads/master#l922
  72 *
  73 * In http://lists.denx.de/pipermail/u-boot/2016-January/243752.html
  74 * ("[U-Boot] [PATCH] rpi: fix up Model B entries") Dom Cobley at the RPi
  75 * Foundation stated that the following source was accurate:
  76 * https://github.com/AndrewFromMelbourne/raspberry_pi_revision
  77 */
  78struct rpi_model {
  79        const char *name;
  80        const char *fdtfile;
  81        bool has_onboard_eth;
  82};
  83
  84static const struct rpi_model rpi_model_unknown = {
  85        "Unknown model",
  86        "bcm283x-rpi-other.dtb",
  87        false,
  88};
  89
  90static const struct rpi_model rpi_models_new_scheme[] = {
  91        [0x4] = {
  92                "2 Model B",
  93                "bcm2836-rpi-2-b.dtb",
  94                true,
  95        },
  96        [0x8] = {
  97                "3 Model B",
  98                "bcm2837-rpi-3-b.dtb",
  99                true,
 100        },
 101        [0x9] = {
 102                "Zero",
 103                "bcm2835-rpi-zero.dtb",
 104                false,
 105        },
 106};
 107
 108static const struct rpi_model rpi_models_old_scheme[] = {
 109        [0x2] = {
 110                "Model B",
 111                "bcm2835-rpi-b.dtb",
 112                true,
 113        },
 114        [0x3] = {
 115                "Model B",
 116                "bcm2835-rpi-b.dtb",
 117                true,
 118        },
 119        [0x4] = {
 120                "Model B rev2",
 121                "bcm2835-rpi-b-rev2.dtb",
 122                true,
 123        },
 124        [0x5] = {
 125                "Model B rev2",
 126                "bcm2835-rpi-b-rev2.dtb",
 127                true,
 128        },
 129        [0x6] = {
 130                "Model B rev2",
 131                "bcm2835-rpi-b-rev2.dtb",
 132                true,
 133        },
 134        [0x7] = {
 135                "Model A",
 136                "bcm2835-rpi-a.dtb",
 137                false,
 138        },
 139        [0x8] = {
 140                "Model A",
 141                "bcm2835-rpi-a.dtb",
 142                false,
 143        },
 144        [0x9] = {
 145                "Model A",
 146                "bcm2835-rpi-a.dtb",
 147                false,
 148        },
 149        [0xd] = {
 150                "Model B rev2",
 151                "bcm2835-rpi-b-rev2.dtb",
 152                true,
 153        },
 154        [0xe] = {
 155                "Model B rev2",
 156                "bcm2835-rpi-b-rev2.dtb",
 157                true,
 158        },
 159        [0xf] = {
 160                "Model B rev2",
 161                "bcm2835-rpi-b-rev2.dtb",
 162                true,
 163        },
 164        [0x10] = {
 165                "Model B+",
 166                "bcm2835-rpi-b-plus.dtb",
 167                true,
 168        },
 169        [0x11] = {
 170                "Compute Module",
 171                "bcm2835-rpi-cm.dtb",
 172                false,
 173        },
 174        [0x12] = {
 175                "Model A+",
 176                "bcm2835-rpi-a-plus.dtb",
 177                false,
 178        },
 179        [0x13] = {
 180                "Model B+",
 181                "bcm2835-rpi-b-plus.dtb",
 182                true,
 183        },
 184        [0x14] = {
 185                "Compute Module",
 186                "bcm2835-rpi-cm.dtb",
 187                false,
 188        },
 189        [0x15] = {
 190                "Model A+",
 191                "bcm2835-rpi-a-plus.dtb",
 192                false,
 193        },
 194};
 195
 196static uint32_t revision;
 197static uint32_t rev_scheme;
 198static uint32_t rev_type;
 199static const struct rpi_model *model;
 200
 201#ifdef CONFIG_ARM64
 202static struct mm_region bcm2837_mem_map[] = {
 203        {
 204                .virt = 0x00000000UL,
 205                .phys = 0x00000000UL,
 206                .size = 0x3f000000UL,
 207                .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 208                         PTE_BLOCK_INNER_SHARE
 209        }, {
 210                .virt = 0x3f000000UL,
 211                .phys = 0x3f000000UL,
 212                .size = 0x01000000UL,
 213                .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
 214                         PTE_BLOCK_NON_SHARE |
 215                         PTE_BLOCK_PXN | PTE_BLOCK_UXN
 216        }, {
 217                /* List terminator */
 218                0,
 219        }
 220};
 221
 222struct mm_region *mem_map = bcm2837_mem_map;
 223#endif
 224
 225int dram_init(void)
 226{
 227        ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1);
 228        int ret;
 229
 230        BCM2835_MBOX_INIT_HDR(msg);
 231        BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
 232
 233        ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 234        if (ret) {
 235                printf("bcm2835: Could not query ARM memory size\n");
 236                return -1;
 237        }
 238
 239        gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
 240
 241        return 0;
 242}
 243
 244static void set_fdtfile(void)
 245{
 246        const char *fdtfile;
 247
 248        if (getenv("fdtfile"))
 249                return;
 250
 251        fdtfile = model->fdtfile;
 252        setenv("fdtfile", fdtfile);
 253}
 254
 255/*
 256 * If the firmware provided a valid FDT at boot time, let's expose it in
 257 * ${fdt_addr} so it may be passed unmodified to the kernel.
 258 */
 259static void set_fdt_addr(void)
 260{
 261        if (getenv("fdt_addr"))
 262                return;
 263
 264        if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
 265                return;
 266
 267        setenv_hex("fdt_addr", fw_dtb_pointer);
 268}
 269
 270/*
 271 * Prevent relocation from stomping on a firmware provided FDT blob.
 272 */
 273unsigned long board_get_usable_ram_top(unsigned long total_size)
 274{
 275        if ((gd->ram_top - fw_dtb_pointer) > SZ_64M)
 276                return gd->ram_top;
 277        return fw_dtb_pointer & ~0xffff;
 278}
 279
 280static void set_usbethaddr(void)
 281{
 282        ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
 283        int ret;
 284
 285        if (!model->has_onboard_eth)
 286                return;
 287
 288        if (getenv("usbethaddr"))
 289                return;
 290
 291        BCM2835_MBOX_INIT_HDR(msg);
 292        BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
 293
 294        ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 295        if (ret) {
 296                printf("bcm2835: Could not query MAC address\n");
 297                /* Ignore error; not critical */
 298                return;
 299        }
 300
 301        eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
 302
 303        if (!getenv("ethaddr"))
 304                setenv("ethaddr", getenv("usbethaddr"));
 305
 306        return;
 307}
 308
 309#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 310static void set_board_info(void)
 311{
 312        char s[11];
 313
 314        snprintf(s, sizeof(s), "0x%X", revision);
 315        setenv("board_revision", s);
 316        snprintf(s, sizeof(s), "%d", rev_scheme);
 317        setenv("board_rev_scheme", s);
 318        /* Can't rename this to board_rev_type since it's an ABI for scripts */
 319        snprintf(s, sizeof(s), "0x%X", rev_type);
 320        setenv("board_rev", s);
 321        setenv("board_name", model->name);
 322}
 323#endif /* CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG */
 324
 325static void set_serial_number(void)
 326{
 327        ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_serial, msg, 1);
 328        int ret;
 329        char serial_string[17] = { 0 };
 330
 331        if (getenv("serial#"))
 332                return;
 333
 334        BCM2835_MBOX_INIT_HDR(msg);
 335        BCM2835_MBOX_INIT_TAG_NO_REQ(&msg->get_board_serial, GET_BOARD_SERIAL);
 336
 337        ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 338        if (ret) {
 339                printf("bcm2835: Could not query board serial\n");
 340                /* Ignore error; not critical */
 341                return;
 342        }
 343
 344        snprintf(serial_string, sizeof(serial_string), "%016" PRIx64,
 345                 msg->get_board_serial.body.resp.serial);
 346        setenv("serial#", serial_string);
 347}
 348
 349int misc_init_r(void)
 350{
 351        set_fdt_addr();
 352        set_fdtfile();
 353        set_usbethaddr();
 354#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 355        set_board_info();
 356#endif
 357        set_serial_number();
 358
 359        return 0;
 360}
 361
 362static int power_on_module(u32 module)
 363{
 364        ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
 365        int ret;
 366
 367        BCM2835_MBOX_INIT_HDR(msg_pwr);
 368        BCM2835_MBOX_INIT_TAG(&msg_pwr->set_power_state,
 369                              SET_POWER_STATE);
 370        msg_pwr->set_power_state.body.req.device_id = module;
 371        msg_pwr->set_power_state.body.req.state =
 372                BCM2835_MBOX_SET_POWER_STATE_REQ_ON |
 373                BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT;
 374
 375        ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
 376                                     &msg_pwr->hdr);
 377        if (ret) {
 378                printf("bcm2835: Could not set module %u power state\n",
 379                       module);
 380                return -1;
 381        }
 382
 383        return 0;
 384}
 385
 386static void get_board_rev(void)
 387{
 388        ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
 389        int ret;
 390        const struct rpi_model *models;
 391        uint32_t models_count;
 392
 393        BCM2835_MBOX_INIT_HDR(msg);
 394        BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);
 395
 396        ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 397        if (ret) {
 398                printf("bcm2835: Could not query board revision\n");
 399                /* Ignore error; not critical */
 400                return;
 401        }
 402
 403        /*
 404         * For details of old-vs-new scheme, see:
 405         * https://github.com/pimoroni/RPi.version/blob/master/RPi/version.py
 406         * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=99293&p=690282
 407         * (a few posts down)
 408         *
 409         * For the RPi 1, bit 24 is the "warranty bit", so we mask off just the
 410         * lower byte to use as the board rev:
 411         * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
 412         * http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
 413         */
 414        revision = msg->get_board_rev.body.resp.rev;
 415        if (revision & 0x800000) {
 416                rev_scheme = 1;
 417                rev_type = (revision >> 4) & 0xff;
 418                models = rpi_models_new_scheme;
 419                models_count = ARRAY_SIZE(rpi_models_new_scheme);
 420        } else {
 421                rev_scheme = 0;
 422                rev_type = revision & 0xff;
 423                models = rpi_models_old_scheme;
 424                models_count = ARRAY_SIZE(rpi_models_old_scheme);
 425        }
 426        if (rev_type >= models_count) {
 427                printf("RPI: Board rev 0x%x outside known range\n", rev_type);
 428                model = &rpi_model_unknown;
 429        } else if (!models[rev_type].name) {
 430                printf("RPI: Board rev 0x%x unknown\n", rev_type);
 431                model = &rpi_model_unknown;
 432        } else {
 433                model = &models[rev_type];
 434        }
 435
 436        printf("RPI %s (0x%x)\n", model->name, revision);
 437}
 438
 439#ifndef CONFIG_PL01X_SERIAL
 440static bool rpi_is_serial_active(void)
 441{
 442        int serial_gpio = 15;
 443        struct udevice *dev;
 444
 445        /*
 446         * The RPi3 disables the mini uart by default. The easiest way to find
 447         * out whether it is available is to check if the RX pin is muxed.
 448         */
 449
 450        if (uclass_first_device(UCLASS_GPIO, &dev) || !dev)
 451                return true;
 452
 453        if (bcm2835_gpio_get_func_id(dev, serial_gpio) != BCM2835_GPIO_ALT5)
 454                return false;
 455
 456        return true;
 457}
 458
 459/* Disable mini-UART I/O if it's not pinmuxed to our pins.
 460 * The firmware only enables it if explicitly done in config.txt: enable_uart=1
 461 */
 462static void rpi_disable_inactive_uart(void)
 463{
 464        struct udevice *dev;
 465        struct bcm283x_mu_serial_platdata *plat;
 466
 467        if (uclass_get_device_by_driver(UCLASS_SERIAL,
 468                                        DM_GET_DRIVER(serial_bcm283x_mu),
 469                                        &dev) || !dev)
 470                return;
 471
 472        if (!rpi_is_serial_active()) {
 473                plat = dev_get_platdata(dev);
 474                plat->disabled = true;
 475        }
 476}
 477#endif
 478
 479int board_init(void)
 480{
 481#ifndef CONFIG_PL01X_SERIAL
 482        rpi_disable_inactive_uart();
 483#endif
 484
 485        get_board_rev();
 486
 487        gd->bd->bi_boot_params = 0x100;
 488
 489        return power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
 490}
 491
 492int board_mmc_init(bd_t *bis)
 493{
 494        ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1);
 495        int ret;
 496
 497        power_on_module(BCM2835_MBOX_POWER_DEVID_SDHCI);
 498
 499        BCM2835_MBOX_INIT_HDR(msg_clk);
 500        BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE);
 501        msg_clk->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC;
 502
 503        ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_clk->hdr);
 504        if (ret) {
 505                printf("bcm2835: Could not query eMMC clock rate\n");
 506                return -1;
 507        }
 508
 509        return bcm2835_sdhci_init(BCM2835_SDHCI_BASE,
 510                                  msg_clk->get_clock_rate.body.resp.rate_hz);
 511}
 512
 513int ft_board_setup(void *blob, bd_t *bd)
 514{
 515        /*
 516         * For now, we simply always add the simplefb DT node. Later, we
 517         * should be more intelligent, and e.g. only do this if no enabled DT
 518         * node exists for the "real" graphics driver.
 519         */
 520        lcd_dt_simplefb_add_node(blob);
 521
 522#ifdef CONFIG_EFI_LOADER
 523        /* Reserve the spin table */
 524        efi_add_memory_map(0, 1, EFI_RESERVED_MEMORY_TYPE, 0);
 525#endif
 526
 527        return 0;
 528}
 529