board/raspberrypi/rpi/rpi.c

   1 /*
   2  * (C) Copyright 2012-2013,2015 Stephen Warren
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <config.h>
   9 #include <dm.h>
  10 #include <fdt_support.h>
  11 #include <fdt_simplefb.h>
  12 #include <lcd.h>
  13 #include <memalign.h>
  14 #include <mmc.h>
  15 #include <asm/gpio.h>
  16 #include <asm/arch/mbox.h>
  17 #include <asm/arch/sdhci.h>
  18 #include <asm/global_data.h>
  19 #include <dm/platform_data/serial_pl01x.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 static const struct bcm2835_gpio_platdata gpio_platdata = {
  24         .base = BCM2835_GPIO_BASE,
  25 };
  26
  27 U_BOOT_DEVICE(bcm2835_gpios) = {
  28         .name = "gpio_bcm2835",
  29         .platdata = &gpio_platdata,
  30 };
  31
  32 static const struct pl01x_serial_platdata serial_platdata = {
  33 #ifdef CONFIG_BCM2836
  34         .base = 0x3f201000,
  35 #else
  36         .base = 0x20201000,
  37 #endif
  38         .type = TYPE_PL011,
  39         .clock = 3000000,
  40 };
  41
  42 U_BOOT_DEVICE(bcm2835_serials) = {
  43         .name = "serial_pl01x",
  44         .platdata = &serial_platdata,
  45 };
  46
  47 struct msg_get_arm_mem {
  48         struct bcm2835_mbox_hdr hdr;
  49         struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
  50         u32 end_tag;
  51 };
  52
  53 struct msg_get_board_rev {
  54         struct bcm2835_mbox_hdr hdr;
  55         struct bcm2835_mbox_tag_get_board_rev get_board_rev;
  56         u32 end_tag;
  57 };
  58
  59 struct msg_get_mac_address {
  60         struct bcm2835_mbox_hdr hdr;
  61         struct bcm2835_mbox_tag_get_mac_address get_mac_address;
  62         u32 end_tag;
  63 };
  64
  65 struct msg_set_power_state {
  66         struct bcm2835_mbox_hdr hdr;
  67         struct bcm2835_mbox_tag_set_power_state set_power_state;
  68         u32 end_tag;
  69 };
  70
  71 struct msg_get_clock_rate {
  72         struct bcm2835_mbox_hdr hdr;
  73         struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
  74         u32 end_tag;
  75 };
  76
  77 /*
  78  * http://raspberryalphaomega.org.uk/2013/02/06/automatic-raspberry-pi-board-revision-detection-model-a-b1-and-b2/
  79  * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=32733
  80  * http://git.drogon.net/?p=wiringPi;a=blob;f=wiringPi/wiringPi.c;h=503151f61014418b9c42f4476a6086f75cd4e64b;hb=refs/heads/master#l922
  81  *
  82  * In http://lists.denx.de/pipermail/u-boot/2016-January/243752.html
  83  * ("[U-Boot] [PATCH] rpi: fix up Model B entries") Dom Cobley at the RPi
  84  * Foundation stated that the following source was accurate:
  85  * https://github.com/AndrewFromMelbourne/raspberry_pi_revision
  86  */
  87 struct rpi_model {
  88         const char *name;
  89         const char *fdtfile;
  90         bool has_onboard_eth;
  91 };
  92
  93 static const struct rpi_model rpi_model_unknown = {
  94         "Unknown model",
  95 #ifdef CONFIG_BCM2836
  96         "bcm2836-rpi-other.dtb",
  97 #else
  98         "bcm2835-rpi-other.dtb",
  99 #endif
 100         false,
 101 };
 102
 103 static const struct rpi_model rpi_models_new_scheme[] = {
 104         [0x4] = {
 105                 "2 Model B",
 106                 "bcm2836-rpi-2-b.dtb",
 107                 true,
 108         },
 109         [0x9] = {
 110                 "Zero",
 111                 "bcm2835-rpi-zero.dtb",
 112                 false,
 113         },
 114 };
 115
 116 static const struct rpi_model rpi_models_old_scheme[] = {
 117         [0x2] = {
 118                 "Model B (no P5)",
 119                 "bcm2835-rpi-b-i2c0.dtb",
 120                 true,
 121         },
 122         [0x3] = {
 123                 "Model B (no P5)",
 124                 "bcm2835-rpi-b-i2c0.dtb",
 125                 true,
 126         },
 127         [0x4] = {
 128                 "Model B",
 129                 "bcm2835-rpi-b.dtb",
 130                 true,
 131         },
 132         [0x5] = {
 133                 "Model B",
 134                 "bcm2835-rpi-b.dtb",
 135                 true,
 136         },
 137         [0x6] = {
 138                 "Model B",
 139                 "bcm2835-rpi-b.dtb",
 140                 true,
 141         },
 142         [0x7] = {
 143                 "Model A",
 144                 "bcm2835-rpi-a.dtb",
 145                 false,
 146         },
 147         [0x8] = {
 148                 "Model A",
 149                 "bcm2835-rpi-a.dtb",
 150                 false,
 151         },
 152         [0x9] = {
 153                 "Model A",
 154                 "bcm2835-rpi-a.dtb",
 155                 false,
 156         },
 157         [0xd] = {
 158                 "Model B rev2",
 159                 "bcm2835-rpi-b-rev2.dtb",
 160                 true,
 161         },
 162         [0xe] = {
 163                 "Model B rev2",
 164                 "bcm2835-rpi-b-rev2.dtb",
 165                 true,
 166         },
 167         [0xf] = {
 168                 "Model B rev2",
 169                 "bcm2835-rpi-b-rev2.dtb",
 170                 true,
 171         },
 172         [0x10] = {
 173                 "Model B+",
 174                 "bcm2835-rpi-b-plus.dtb",
 175                 true,
 176         },
 177         [0x11] = {
 178                 "Compute Module",
 179                 "bcm2835-rpi-cm.dtb",
 180                 false,
 181         },
 182         [0x12] = {
 183                 "Model A+",
 184                 "bcm2835-rpi-a-plus.dtb",
 185                 false,
 186         },
 187         [0x13] = {
 188                 "Model B+",
 189                 "bcm2835-rpi-b-plus.dtb",
 190                 true,
 191         },
 192         [0x14] = {
 193                 "Compute Module",
 194                 "bcm2835-rpi-cm.dtb",
 195                 false,
 196         },
 197         [0x15] = {
 198                 "Model A+",
 199                 "bcm2835-rpi-a-plus.dtb",
 200                 false,
 201         },
 202 };
 203
 204 static uint32_t revision;
 205 static uint32_t rev_scheme;
 206 static uint32_t rev_type;
 207 static const struct rpi_model *model;
 208
 209 int dram_init(void)
 210 {
 211         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1);
 212         int ret;
 213
 214         BCM2835_MBOX_INIT_HDR(msg);
 215         BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
 216
 217         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 218         if (ret) {
 219                 printf("bcm2835: Could not query ARM memory size\n");
 220                 return -1;
 221         }
 222
 223         gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
 224
 225         return 0;
 226 }
 227
 228 static void set_fdtfile(void)
 229 {
 230         const char *fdtfile;
 231
 232         if (getenv("fdtfile"))
 233                 return;
 234
 235         fdtfile = model->fdtfile;
 236         setenv("fdtfile", fdtfile);
 237 }
 238
 239 static void set_usbethaddr(void)
 240 {
 241         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
 242         int ret;
 243
 244         if (!model->has_onboard_eth)
 245                 return;
 246
 247         if (getenv("usbethaddr"))
 248                 return;
 249
 250         BCM2835_MBOX_INIT_HDR(msg);
 251         BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
 252
 253         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 254         if (ret) {
 255                 printf("bcm2835: Could not query MAC address\n");
 256                 /* Ignore error; not critical */
 257                 return;
 258         }
 259
 260         eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
 261
 262         return;
 263 }
 264
 265 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 266 static void set_board_info(void)
 267 {
 268         char s[11];
 269
 270         snprintf(s, sizeof(s), "0x%X", revision);
 271         setenv("board_revision", s);
 272         snprintf(s, sizeof(s), "%d", rev_scheme);
 273         setenv("board_rev_scheme", s);
 274         /* Can't rename this to board_rev_type since it's an ABI for scripts */
 275         snprintf(s, sizeof(s), "0x%X", rev_type);
 276         setenv("board_rev", s);
 277         setenv("board_name", model->name);
 278 }
 279 #endif /* CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG */
 280
 281 int misc_init_r(void)
 282 {
 283         set_fdtfile();
 284         set_usbethaddr();
 285 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 286         set_board_info();
 287 #endif
 288         return 0;
 289 }
 290
 291 static int power_on_module(u32 module)
 292 {
 293         ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
 294         int ret;
 295
 296         BCM2835_MBOX_INIT_HDR(msg_pwr);
 297         BCM2835_MBOX_INIT_TAG(&msg_pwr->set_power_state,
 298                               SET_POWER_STATE);
 299         msg_pwr->set_power_state.body.req.device_id = module;
 300         msg_pwr->set_power_state.body.req.state =
 301                 BCM2835_MBOX_SET_POWER_STATE_REQ_ON |
 302                 BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT;
 303
 304         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
 305                                      &msg_pwr->hdr);
 306         if (ret) {
 307                 printf("bcm2835: Could not set module %u power state\n",
 308                        module);
 309                 return -1;
 310         }
 311
 312         return 0;
 313 }
 314
 315 static void get_board_rev(void)
 316 {
 317         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
 318         int ret;
 319         const struct rpi_model *models;
 320         uint32_t models_count;
 321
 322         BCM2835_MBOX_INIT_HDR(msg);
 323         BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);
 324
 325         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 326         if (ret) {
 327                 printf("bcm2835: Could not query board revision\n");
 328                 /* Ignore error; not critical */
 329                 return;
 330         }
 331
 332         /*
 333          * For details of old-vs-new scheme, see:
 334          * https://github.com/pimoroni/RPi.version/blob/master/RPi/version.py
 335          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=99293&p=690282
 336          * (a few posts down)
 337          *
 338          * For the RPi 1, bit 24 is the "warranty bit", so we mask off just the
 339          * lower byte to use as the board rev:
 340          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
 341          * http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
 342          */
 343         revision = msg->get_board_rev.body.resp.rev;
 344         if (revision & 0x800000) {
 345                 rev_scheme = 1;
 346                 rev_type = (revision >> 4) & 0xff;
 347                 models = rpi_models_new_scheme;
 348                 models_count = ARRAY_SIZE(rpi_models_new_scheme);
 349         } else {
 350                 rev_scheme = 0;
 351                 rev_type = revision & 0xff;
 352                 models = rpi_models_old_scheme;
 353                 models_count = ARRAY_SIZE(rpi_models_old_scheme);
 354         }
 355         if (rev_type >= models_count) {
 356                 printf("RPI: Board rev 0x%x outside known range\n", rev_type);
 357                 model = &rpi_model_unknown;
 358         } else if (!models[rev_type].name) {
 359                 printf("RPI: Board rev 0x%x unknown\n", rev_type);
 360                 model = &rpi_model_unknown;
 361         } else {
 362                 model = &models[rev_type];
 363         }
 364
 365         printf("RPI %s (0x%x)\n", model->name, revision);
 366 }
 367
 368 int board_init(void)
 369 {
 370         get_board_rev();
 371
 372         gd->bd->bi_boot_params = 0x100;
 373
 374         return power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
 375 }
 376
 377 int board_mmc_init(bd_t *bis)
 378 {
 379         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1);
 380         int ret;
 381
 382         power_on_module(BCM2835_MBOX_POWER_DEVID_SDHCI);
 383
 384         BCM2835_MBOX_INIT_HDR(msg_clk);
 385         BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE);
 386         msg_clk->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC;
 387
 388         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_clk->hdr);
 389         if (ret) {
 390                 printf("bcm2835: Could not query eMMC clock rate\n");
 391                 return -1;
 392         }
 393
 394         return bcm2835_sdhci_init(BCM2835_SDHCI_BASE,
 395                                   msg_clk->get_clock_rate.body.resp.rate_hz);
 396 }
 397
 398 int ft_board_setup(void *blob, bd_t *bd)
 399 {
 400         /*
 401          * For now, we simply always add the simplefb DT node. Later, we
 402          * should be more intelligent, and e.g. only do this if no enabled DT
 403          * node exists for the "real" graphics driver.
 404          */
 405         lcd_dt_simplefb_add_node(blob);
 406
 407         return 0;
 408 }