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 struct rpi_model {
  83         const char *name;
  84         const char *fdtfile;
  85         bool has_onboard_eth;
  86 };
  87
  88 static const struct rpi_model rpi_model_unknown = {
  89         "Unknown model",
  90 #ifdef CONFIG_BCM2836
  91         "bcm2836-rpi-other.dtb",
  92 #else
  93         "bcm2835-rpi-other.dtb",
  94 #endif
  95         false,
  96 };
  97
  98 static const struct rpi_model rpi_models_new_scheme[] = {
  99         [0x4] = {
 100                 "2 Model B",
 101                 "bcm2836-rpi-2-b.dtb",
 102                 true,
 103         },
 104         [0x9] = {
 105                 "Zero",
 106                 "bcm2835-rpi-zero.dtb",
 107                 false,
 108         },
 109 };
 110
 111 static const struct rpi_model rpi_models_old_scheme[] = {
 112         [0x2] = {
 113                 "Model B (no P5)",
 114                 "bcm2835-rpi-b-i2c0.dtb",
 115                 true,
 116         },
 117         [0x3] = {
 118                 "Model B (no P5)",
 119                 "bcm2835-rpi-b-i2c0.dtb",
 120                 true,
 121         },
 122         [0x4] = {
 123                 "Model B",
 124                 "bcm2835-rpi-b.dtb",
 125                 true,
 126         },
 127         [0x5] = {
 128                 "Model B",
 129                 "bcm2835-rpi-b.dtb",
 130                 true,
 131         },
 132         [0x6] = {
 133                 "Model B",
 134                 "bcm2835-rpi-b.dtb",
 135                 true,
 136         },
 137         [0x7] = {
 138                 "Model A",
 139                 "bcm2835-rpi-a.dtb",
 140                 false,
 141         },
 142         [0x8] = {
 143                 "Model A",
 144                 "bcm2835-rpi-a.dtb",
 145                 false,
 146         },
 147         [0x9] = {
 148                 "Model A",
 149                 "bcm2835-rpi-a.dtb",
 150                 false,
 151         },
 152         [0xd] = {
 153                 "Model B rev2",
 154                 "bcm2835-rpi-b-rev2.dtb",
 155                 true,
 156         },
 157         [0xe] = {
 158                 "Model B rev2",
 159                 "bcm2835-rpi-b-rev2.dtb",
 160                 true,
 161         },
 162         [0xf] = {
 163                 "Model B rev2",
 164                 "bcm2835-rpi-b-rev2.dtb",
 165                 true,
 166         },
 167         [0x10] = {
 168                 "Model B+",
 169                 "bcm2835-rpi-b-plus.dtb",
 170                 true,
 171         },
 172         [0x11] = {
 173                 "Compute Module",
 174                 "bcm2835-rpi-cm.dtb",
 175                 false,
 176         },
 177         [0x12] = {
 178                 "Model A+",
 179                 "bcm2835-rpi-a-plus.dtb",
 180                 false,
 181         },
 182         [0x13] = {
 183                 "Model B+",
 184                 "bcm2835-rpi-b-plus.dtb",
 185                 true,
 186         },
 187         [0x14] = {
 188                 "Compute Module",
 189                 "bcm2835-rpi-cm.dtb",
 190                 false,
 191         },
 192         [0x15] = {
 193                 "Model A+",
 194                 "bcm2835-rpi-a-plus.dtb",
 195                 false,
 196         },
 197 };
 198
 199 static uint32_t revision;
 200 static uint32_t rev_scheme;
 201 static uint32_t rev_type;
 202 static const struct rpi_model *model;
 203
 204 int dram_init(void)
 205 {
 206         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1);
 207         int ret;
 208
 209         BCM2835_MBOX_INIT_HDR(msg);
 210         BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
 211
 212         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 213         if (ret) {
 214                 printf("bcm2835: Could not query ARM memory size\n");
 215                 return -1;
 216         }
 217
 218         gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
 219
 220         return 0;
 221 }
 222
 223 static void set_fdtfile(void)
 224 {
 225         const char *fdtfile;
 226
 227         if (getenv("fdtfile"))
 228                 return;
 229
 230         fdtfile = model->fdtfile;
 231         setenv("fdtfile", fdtfile);
 232 }
 233
 234 static void set_usbethaddr(void)
 235 {
 236         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
 237         int ret;
 238
 239         if (!model->has_onboard_eth)
 240                 return;
 241
 242         if (getenv("usbethaddr"))
 243                 return;
 244
 245         BCM2835_MBOX_INIT_HDR(msg);
 246         BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
 247
 248         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 249         if (ret) {
 250                 printf("bcm2835: Could not query MAC address\n");
 251                 /* Ignore error; not critical */
 252                 return;
 253         }
 254
 255         eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
 256
 257         return;
 258 }
 259
 260 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 261 static void set_board_info(void)
 262 {
 263         char s[11];
 264
 265         snprintf(s, sizeof(s), "0x%X", revision);
 266         setenv("board_revision", s);
 267         snprintf(s, sizeof(s), "%d", rev_scheme);
 268         setenv("board_rev_scheme", s);
 269         /* Can't rename this to board_rev_type since it's an ABI for scripts */
 270         snprintf(s, sizeof(s), "0x%X", rev_type);
 271         setenv("board_rev", s);
 272         setenv("board_name", model->name);
 273 }
 274 #endif /* CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG */
 275
 276 int misc_init_r(void)
 277 {
 278         set_fdtfile();
 279         set_usbethaddr();
 280 #ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
 281         set_board_info();
 282 #endif
 283         return 0;
 284 }
 285
 286 static int power_on_module(u32 module)
 287 {
 288         ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
 289         int ret;
 290
 291         BCM2835_MBOX_INIT_HDR(msg_pwr);
 292         BCM2835_MBOX_INIT_TAG(&msg_pwr->set_power_state,
 293                               SET_POWER_STATE);
 294         msg_pwr->set_power_state.body.req.device_id = module;
 295         msg_pwr->set_power_state.body.req.state =
 296                 BCM2835_MBOX_SET_POWER_STATE_REQ_ON |
 297                 BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT;
 298
 299         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
 300                                      &msg_pwr->hdr);
 301         if (ret) {
 302                 printf("bcm2835: Could not set module %u power state\n",
 303                        module);
 304                 return -1;
 305         }
 306
 307         return 0;
 308 }
 309
 310 static void get_board_rev(void)
 311 {
 312         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
 313         int ret;
 314         const struct rpi_model *models;
 315         uint32_t models_count;
 316
 317         BCM2835_MBOX_INIT_HDR(msg);
 318         BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);
 319
 320         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
 321         if (ret) {
 322                 printf("bcm2835: Could not query board revision\n");
 323                 /* Ignore error; not critical */
 324                 return;
 325         }
 326
 327         /*
 328          * For details of old-vs-new scheme, see:
 329          * https://github.com/pimoroni/RPi.version/blob/master/RPi/version.py
 330          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=99293&p=690282
 331          * (a few posts down)
 332          *
 333          * For the RPi 1, bit 24 is the "warranty bit", so we mask off just the
 334          * lower byte to use as the board rev:
 335          * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
 336          * http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
 337          */
 338         revision = msg->get_board_rev.body.resp.rev;
 339         if (revision & 0x800000) {
 340                 rev_scheme = 1;
 341                 rev_type = (revision >> 4) & 0xff;
 342                 models = rpi_models_new_scheme;
 343                 models_count = ARRAY_SIZE(rpi_models_new_scheme);
 344         } else {
 345                 rev_scheme = 0;
 346                 rev_type = revision & 0xff;
 347                 models = rpi_models_old_scheme;
 348                 models_count = ARRAY_SIZE(rpi_models_old_scheme);
 349         }
 350         if (rev_type >= models_count) {
 351                 printf("RPI: Board rev 0x%x outside known range\n", rev_type);
 352                 model = &rpi_model_unknown;
 353         } else if (!models[rev_type].name) {
 354                 printf("RPI: Board rev 0x%x unknown\n", rev_type);
 355                 model = &rpi_model_unknown;
 356         } else {
 357                 model = &models[rev_type];
 358         }
 359
 360         printf("RPI %s (0x%x)\n", model->name, revision);
 361 }
 362
 363 int board_init(void)
 364 {
 365         get_board_rev();
 366
 367         gd->bd->bi_boot_params = 0x100;
 368
 369         return power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
 370 }
 371
 372 int board_mmc_init(bd_t *bis)
 373 {
 374         ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1);
 375         int ret;
 376
 377         power_on_module(BCM2835_MBOX_POWER_DEVID_SDHCI);
 378
 379         BCM2835_MBOX_INIT_HDR(msg_clk);
 380         BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE);
 381         msg_clk->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC;
 382
 383         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_clk->hdr);
 384         if (ret) {
 385                 printf("bcm2835: Could not query eMMC clock rate\n");
 386                 return -1;
 387         }
 388
 389         return bcm2835_sdhci_init(BCM2835_SDHCI_BASE,
 390                                   msg_clk->get_clock_rate.body.resp.rate_hz);
 391 }
 392
 393 int ft_board_setup(void *blob, bd_t *bd)
 394 {
 395         /*
 396          * For now, we simply always add the simplefb DT node. Later, we
 397          * should be more intelligent, and e.g. only do this if no enabled DT
 398          * node exists for the "real" graphics driver.
 399          */
 400         lcd_dt_simplefb_add_node(blob);
 401
 402         return 0;
 403 }