arch/mips/ar7/platform.c

   1 /*
   2  * Copyright (C) 2006,2007 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2006,2007 Eugene Konev <ejka@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/types.h>
  22 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/mtd/physmap.h>
  27 #include <linux/serial.h>
  28 #include <linux/serial_8250.h>
  29 #include <linux/ioport.h>
  30 #include <linux/io.h>
  31 #include <linux/vlynq.h>
  32 #include <linux/leds.h>
  33 #include <linux/string.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/phy.h>
  36 #include <linux/phy_fixed.h>
  37 #include <linux/gpio.h>
  38 #include <linux/clk.h>
  39
  40 #include <asm/addrspace.h>
  41 #include <asm/mach-ar7/ar7.h>
  42 #include <asm/mach-ar7/prom.h>
  43
  44 /*****************************************************************************
  45  * VLYNQ Bus
  46  ****************************************************************************/
  47 struct plat_vlynq_data {
  48         struct plat_vlynq_ops ops;
  49         int gpio_bit;
  50         int reset_bit;
  51 };
  52
  53 static int vlynq_on(struct vlynq_device *dev)
  54 {
  55         int ret;
  56         struct plat_vlynq_data *pdata = dev->dev.platform_data;
  57
  58         ret = gpio_request(pdata->gpio_bit, "vlynq");
  59         if (ret)
  60                 goto out;
  61
  62         ar7_device_reset(pdata->reset_bit);
  63
  64         ret = ar7_gpio_disable(pdata->gpio_bit);
  65         if (ret)
  66                 goto out_enabled;
  67
  68         ret = ar7_gpio_enable(pdata->gpio_bit);
  69         if (ret)
  70                 goto out_enabled;
  71
  72         ret = gpio_direction_output(pdata->gpio_bit, 0);
  73         if (ret)
  74                 goto out_gpio_enabled;
  75
  76         msleep(50);
  77
  78         gpio_set_value(pdata->gpio_bit, 1);
  79
  80         msleep(50);
  81
  82         return 0;
  83
  84 out_gpio_enabled:
  85         ar7_gpio_disable(pdata->gpio_bit);
  86 out_enabled:
  87         ar7_device_disable(pdata->reset_bit);
  88         gpio_free(pdata->gpio_bit);
  89 out:
  90         return ret;
  91 }
  92
  93 static void vlynq_off(struct vlynq_device *dev)
  94 {
  95         struct plat_vlynq_data *pdata = dev->dev.platform_data;
  96
  97         ar7_gpio_disable(pdata->gpio_bit);
  98         gpio_free(pdata->gpio_bit);
  99         ar7_device_disable(pdata->reset_bit);
 100 }
 101
 102 static struct resource vlynq_low_res[] = {
 103         {
 104                 .name   = "regs",
 105                 .flags  = IORESOURCE_MEM,
 106                 .start  = AR7_REGS_VLYNQ0,
 107                 .end    = AR7_REGS_VLYNQ0 + 0xff,
 108         },
 109         {
 110                 .name   = "irq",
 111                 .flags  = IORESOURCE_IRQ,
 112                 .start  = 29,
 113                 .end    = 29,
 114         },
 115         {
 116                 .name   = "mem",
 117                 .flags  = IORESOURCE_MEM,
 118                 .start  = 0x04000000,
 119                 .end    = 0x04ffffff,
 120         },
 121         {
 122                 .name   = "devirq",
 123                 .flags  = IORESOURCE_IRQ,
 124                 .start  = 80,
 125                 .end    = 111,
 126         },
 127 };
 128
 129 static struct resource vlynq_high_res[] = {
 130         {
 131                 .name   = "regs",
 132                 .flags  = IORESOURCE_MEM,
 133                 .start  = AR7_REGS_VLYNQ1,
 134                 .end    = AR7_REGS_VLYNQ1 + 0xff,
 135         },
 136         {
 137                 .name   = "irq",
 138                 .flags  = IORESOURCE_IRQ,
 139                 .start  = 33,
 140                 .end    = 33,
 141         },
 142         {
 143                 .name   = "mem",
 144                 .flags  = IORESOURCE_MEM,
 145                 .start  = 0x0c000000,
 146                 .end    = 0x0cffffff,
 147         },
 148         {
 149                 .name   = "devirq",
 150                 .flags  = IORESOURCE_IRQ,
 151                 .start  = 112,
 152                 .end    = 143,
 153         },
 154 };
 155
 156 static struct plat_vlynq_data vlynq_low_data = {
 157         .ops = {
 158                 .on     = vlynq_on,
 159                 .off    = vlynq_off,
 160         },
 161         .reset_bit      = 20,
 162         .gpio_bit       = 18,
 163 };
 164
 165 static struct plat_vlynq_data vlynq_high_data = {
 166         .ops = {
 167                 .on     = vlynq_on,
 168                 .off    = vlynq_off,
 169         },
 170         .reset_bit      = 16,
 171         .gpio_bit       = 19,
 172 };
 173
 174 static struct platform_device vlynq_low = {
 175         .id             = 0,
 176         .name           = "vlynq",
 177         .dev = {
 178                 .platform_data  = &vlynq_low_data,
 179         },
 180         .resource       = vlynq_low_res,
 181         .num_resources  = ARRAY_SIZE(vlynq_low_res),
 182 };
 183
 184 static struct platform_device vlynq_high = {
 185         .id             = 1,
 186         .name           = "vlynq",
 187         .dev = {
 188                 .platform_data  = &vlynq_high_data,
 189         },
 190         .resource       = vlynq_high_res,
 191         .num_resources  = ARRAY_SIZE(vlynq_high_res),
 192 };
 193
 194 /*****************************************************************************
 195  * Flash
 196  ****************************************************************************/
 197 static struct resource physmap_flash_resource = {
 198         .name   = "mem",
 199         .flags  = IORESOURCE_MEM,
 200         .start  = 0x10000000,
 201         .end    = 0x107fffff,
 202 };
 203
 204 static const char *ar7_probe_types[] = { "ar7part", NULL };
 205
 206 static struct physmap_flash_data physmap_flash_data = {
 207         .width  = 2,
 208         .part_probe_types = ar7_probe_types,
 209 };
 210
 211 static struct platform_device physmap_flash = {
 212         .name           = "physmap-flash",
 213         .dev = {
 214                 .platform_data  = &physmap_flash_data,
 215         },
 216         .resource       = &physmap_flash_resource,
 217         .num_resources  = 1,
 218 };
 219
 220 /*****************************************************************************
 221  * Ethernet
 222  ****************************************************************************/
 223 static struct resource cpmac_low_res[] = {
 224         {
 225                 .name   = "regs",
 226                 .flags  = IORESOURCE_MEM,
 227                 .start  = AR7_REGS_MAC0,
 228                 .end    = AR7_REGS_MAC0 + 0x7ff,
 229         },
 230         {
 231                 .name   = "irq",
 232                 .flags  = IORESOURCE_IRQ,
 233                 .start  = 27,
 234                 .end    = 27,
 235         },
 236 };
 237
 238 static struct resource cpmac_high_res[] = {
 239         {
 240                 .name   = "regs",
 241                 .flags  = IORESOURCE_MEM,
 242                 .start  = AR7_REGS_MAC1,
 243                 .end    = AR7_REGS_MAC1 + 0x7ff,
 244         },
 245         {
 246                 .name   = "irq",
 247                 .flags  = IORESOURCE_IRQ,
 248                 .start  = 41,
 249                 .end    = 41,
 250         },
 251 };
 252
 253 static struct fixed_phy_status fixed_phy_status __initdata = {
 254         .link           = 1,
 255         .speed          = 100,
 256         .duplex         = 1,
 257 };
 258
 259 static struct plat_cpmac_data cpmac_low_data = {
 260         .reset_bit      = 17,
 261         .power_bit      = 20,
 262         .phy_mask       = 0x80000000,
 263 };
 264
 265 static struct plat_cpmac_data cpmac_high_data = {
 266         .reset_bit      = 21,
 267         .power_bit      = 22,
 268         .phy_mask       = 0x7fffffff,
 269 };
 270
 271 static u64 cpmac_dma_mask = DMA_BIT_MASK(32);
 272
 273 static struct platform_device cpmac_low = {
 274         .id             = 0,
 275         .name           = "cpmac",
 276         .dev = {
 277                 .dma_mask               = &cpmac_dma_mask,
 278                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 279                 .platform_data          = &cpmac_low_data,
 280         },
 281         .resource       = cpmac_low_res,
 282         .num_resources  = ARRAY_SIZE(cpmac_low_res),
 283 };
 284
 285 static struct platform_device cpmac_high = {
 286         .id             = 1,
 287         .name           = "cpmac",
 288         .dev = {
 289                 .dma_mask               = &cpmac_dma_mask,
 290                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 291                 .platform_data          = &cpmac_high_data,
 292         },
 293         .resource       = cpmac_high_res,
 294         .num_resources  = ARRAY_SIZE(cpmac_high_res),
 295 };
 296
 297 static void __init cpmac_get_mac(int instance, unsigned char *dev_addr)
 298 {
 299         char name[5], *mac;
 300
 301         sprintf(name, "mac%c", 'a' + instance);
 302         mac = prom_getenv(name);
 303         if (!mac && instance) {
 304                 sprintf(name, "mac%c", 'a');
 305                 mac = prom_getenv(name);
 306         }
 307
 308         if (mac) {
 309                 if (!mac_pton(mac, dev_addr)) {
 310                         pr_warn("cannot parse mac address, using random address\n");
 311                         eth_random_addr(dev_addr);
 312                 }
 313         } else
 314                 eth_random_addr(dev_addr);
 315 }
 316
 317 /*****************************************************************************
 318  * USB
 319  ****************************************************************************/
 320 static struct resource usb_res[] = {
 321         {
 322                 .name   = "regs",
 323                 .flags  = IORESOURCE_MEM,
 324                 .start  = AR7_REGS_USB,
 325                 .end    = AR7_REGS_USB + 0xff,
 326         },
 327         {
 328                 .name   = "irq",
 329                 .flags  = IORESOURCE_IRQ,
 330                 .start  = 32,
 331                 .end    = 32,
 332         },
 333         {
 334                 .name   = "mem",
 335                 .flags  = IORESOURCE_MEM,
 336                 .start  = 0x03400000,
 337                 .end    = 0x03401fff,
 338         },
 339 };
 340
 341 static struct platform_device ar7_udc = {
 342         .name           = "ar7_udc",
 343         .resource       = usb_res,
 344         .num_resources  = ARRAY_SIZE(usb_res),
 345 };
 346
 347 /*****************************************************************************
 348  * LEDs
 349  ****************************************************************************/
 350 static struct gpio_led default_leds[] = {
 351         {
 352                 .name                   = "status",
 353                 .gpio                   = 8,
 354                 .active_low             = 1,
 355         },
 356 };
 357
 358 static struct gpio_led titan_leds[] = {
 359         { .name = "status", .gpio = 8, .active_low = 1, },
 360         { .name = "wifi", .gpio = 13, .active_low = 1, },
 361 };
 362
 363 static struct gpio_led dsl502t_leds[] = {
 364         {
 365                 .name                   = "status",
 366                 .gpio                   = 9,
 367                 .active_low             = 1,
 368         },
 369         {
 370                 .name                   = "ethernet",
 371                 .gpio                   = 7,
 372                 .active_low             = 1,
 373         },
 374         {
 375                 .name                   = "usb",
 376                 .gpio                   = 12,
 377                 .active_low             = 1,
 378         },
 379 };
 380
 381 static struct gpio_led dg834g_leds[] = {
 382         {
 383                 .name                   = "ppp",
 384                 .gpio                   = 6,
 385                 .active_low             = 1,
 386         },
 387         {
 388                 .name                   = "status",
 389                 .gpio                   = 7,
 390                 .active_low             = 1,
 391         },
 392         {
 393                 .name                   = "adsl",
 394                 .gpio                   = 8,
 395                 .active_low             = 1,
 396         },
 397         {
 398                 .name                   = "wifi",
 399                 .gpio                   = 12,
 400                 .active_low             = 1,
 401         },
 402         {
 403                 .name                   = "power",
 404                 .gpio                   = 14,
 405                 .active_low             = 1,
 406                 .default_trigger        = "default-on",
 407         },
 408 };
 409
 410 static struct gpio_led fb_sl_leds[] = {
 411         {
 412                 .name                   = "1",
 413                 .gpio                   = 7,
 414         },
 415         {
 416                 .name                   = "2",
 417                 .gpio                   = 13,
 418                 .active_low             = 1,
 419         },
 420         {
 421                 .name                   = "3",
 422                 .gpio                   = 10,
 423                 .active_low             = 1,
 424         },
 425         {
 426                 .name                   = "4",
 427                 .gpio                   = 12,
 428                 .active_low             = 1,
 429         },
 430         {
 431                 .name                   = "5",
 432                 .gpio                   = 9,
 433                 .active_low             = 1,
 434         },
 435 };
 436
 437 static struct gpio_led fb_fon_leds[] = {
 438         {
 439                 .name                   = "1",
 440                 .gpio                   = 8,
 441         },
 442         {
 443                 .name                   = "2",
 444                 .gpio                   = 3,
 445                 .active_low             = 1,
 446         },
 447         {
 448                 .name                   = "3",
 449                 .gpio                   = 5,
 450         },
 451         {
 452                 .name                   = "4",
 453                 .gpio                   = 4,
 454                 .active_low             = 1,
 455         },
 456         {
 457                 .name                   = "5",
 458                 .gpio                   = 11,
 459                 .active_low             = 1,
 460         },
 461 };
 462
 463 static struct gpio_led gt701_leds[] = {
 464         {
 465                 .name                   = "inet:green",
 466                 .gpio                   = 13,
 467                 .active_low             = 1,
 468         },
 469         {
 470                 .name                   = "usb",
 471                 .gpio                   = 12,
 472                 .active_low             = 1,
 473         },
 474         {
 475                 .name                   = "inet:red",
 476                 .gpio                   = 9,
 477                 .active_low             = 1,
 478         },
 479         {
 480                 .name                   = "power:red",
 481                 .gpio                   = 7,
 482                 .active_low             = 1,
 483         },
 484         {
 485                 .name                   = "power:green",
 486                 .gpio                   = 8,
 487                 .active_low             = 1,
 488                 .default_trigger        = "default-on",
 489         },
 490         {
 491                 .name                   = "ethernet",
 492                 .gpio                   = 10,
 493                 .active_low             = 1,
 494         },
 495 };
 496
 497 static struct gpio_led_platform_data ar7_led_data;
 498
 499 static struct platform_device ar7_gpio_leds = {
 500         .name = "leds-gpio",
 501         .dev = {
 502                 .platform_data = &ar7_led_data,
 503         }
 504 };
 505
 506 static void __init detect_leds(void)
 507 {
 508         char *prid, *usb_prod;
 509
 510         /* Default LEDs */
 511         ar7_led_data.num_leds = ARRAY_SIZE(default_leds);
 512         ar7_led_data.leds = default_leds;
 513
 514         /* FIXME: the whole thing is unreliable */
 515         prid = prom_getenv("ProductID");
 516         usb_prod = prom_getenv("usb_prod");
 517
 518         /* If we can't get the product id from PROM, use the default LEDs */
 519         if (!prid)
 520                 return;
 521
 522         if (strstr(prid, "Fritz_Box_FON")) {
 523                 ar7_led_data.num_leds = ARRAY_SIZE(fb_fon_leds);
 524                 ar7_led_data.leds = fb_fon_leds;
 525         } else if (strstr(prid, "Fritz_Box_")) {
 526                 ar7_led_data.num_leds = ARRAY_SIZE(fb_sl_leds);
 527                 ar7_led_data.leds = fb_sl_leds;
 528         } else if ((!strcmp(prid, "AR7RD") || !strcmp(prid, "AR7DB"))
 529                 && usb_prod != NULL && strstr(usb_prod, "DSL-502T")) {
 530                 ar7_led_data.num_leds = ARRAY_SIZE(dsl502t_leds);
 531                 ar7_led_data.leds = dsl502t_leds;
 532         } else if (strstr(prid, "DG834")) {
 533                 ar7_led_data.num_leds = ARRAY_SIZE(dg834g_leds);
 534                 ar7_led_data.leds = dg834g_leds;
 535         } else if (strstr(prid, "CYWM") || strstr(prid, "CYWL")) {
 536                 ar7_led_data.num_leds = ARRAY_SIZE(titan_leds);
 537                 ar7_led_data.leds = titan_leds;
 538         } else if (strstr(prid, "GT701")) {
 539                 ar7_led_data.num_leds = ARRAY_SIZE(gt701_leds);
 540                 ar7_led_data.leds = gt701_leds;
 541         }
 542 }
 543
 544 /*****************************************************************************
 545  * Watchdog
 546  ****************************************************************************/
 547 static struct resource ar7_wdt_res = {
 548         .name           = "regs",
 549         .flags          = IORESOURCE_MEM,
 550         .start          = -1,   /* Filled at runtime */
 551         .end            = -1,   /* Filled at runtime */
 552 };
 553
 554 static struct platform_device ar7_wdt = {
 555         .name           = "ar7_wdt",
 556         .resource       = &ar7_wdt_res,
 557         .num_resources  = 1,
 558 };
 559
 560 /*****************************************************************************
 561  * Init
 562  ****************************************************************************/
 563 static int __init ar7_register_uarts(void)
 564 {
 565 #ifdef CONFIG_SERIAL_8250
 566         static struct uart_port uart_port __initdata;
 567         struct clk *bus_clk;
 568         int res;
 569
 570         memset(&uart_port, 0, sizeof(struct uart_port));
 571
 572         bus_clk = clk_get(NULL, "bus");
 573         if (IS_ERR(bus_clk))
 574                 panic("unable to get bus clk");
 575
 576         uart_port.type          = PORT_AR7;
 577         uart_port.uartclk       = clk_get_rate(bus_clk) / 2;
 578         uart_port.iotype        = UPIO_MEM32;
 579         uart_port.regshift      = 2;
 580
 581         uart_port.line          = 0;
 582         uart_port.irq           = AR7_IRQ_UART0;
 583         uart_port.mapbase       = AR7_REGS_UART0;
 584         uart_port.membase       = ioremap(uart_port.mapbase, 256);
 585
 586         res = early_serial_setup(&uart_port);
 587         if (res)
 588                 return res;
 589
 590         /* Only TNETD73xx have a second serial port */
 591         if (ar7_has_second_uart()) {
 592                 uart_port.line          = 1;
 593                 uart_port.irq           = AR7_IRQ_UART1;
 594                 uart_port.mapbase       = UR8_REGS_UART1;
 595                 uart_port.membase       = ioremap(uart_port.mapbase, 256);
 596
 597                 res = early_serial_setup(&uart_port);
 598                 if (res)
 599                         return res;
 600         }
 601 #endif
 602
 603         return 0;
 604 }
 605
 606 static void __init titan_fixup_devices(void)
 607 {
 608         /* Set vlynq0 data */
 609         vlynq_low_data.reset_bit = 15;
 610         vlynq_low_data.gpio_bit = 14;
 611
 612         /* Set vlynq1 data */
 613         vlynq_high_data.reset_bit = 16;
 614         vlynq_high_data.gpio_bit = 7;
 615
 616         /* Set vlynq0 resources */
 617         vlynq_low_res[0].start = TITAN_REGS_VLYNQ0;
 618         vlynq_low_res[0].end = TITAN_REGS_VLYNQ0 + 0xff;
 619         vlynq_low_res[1].start = 33;
 620         vlynq_low_res[1].end = 33;
 621         vlynq_low_res[2].start = 0x0c000000;
 622         vlynq_low_res[2].end = 0x0fffffff;
 623         vlynq_low_res[3].start = 80;
 624         vlynq_low_res[3].end = 111;
 625
 626         /* Set vlynq1 resources */
 627         vlynq_high_res[0].start = TITAN_REGS_VLYNQ1;
 628         vlynq_high_res[0].end = TITAN_REGS_VLYNQ1 + 0xff;
 629         vlynq_high_res[1].start = 34;
 630         vlynq_high_res[1].end = 34;
 631         vlynq_high_res[2].start = 0x40000000;
 632         vlynq_high_res[2].end = 0x43ffffff;
 633         vlynq_high_res[3].start = 112;
 634         vlynq_high_res[3].end = 143;
 635
 636         /* Set cpmac0 data */
 637         cpmac_low_data.phy_mask = 0x40000000;
 638
 639         /* Set cpmac1 data */
 640         cpmac_high_data.phy_mask = 0x80000000;
 641
 642         /* Set cpmac0 resources */
 643         cpmac_low_res[0].start = TITAN_REGS_MAC0;
 644         cpmac_low_res[0].end = TITAN_REGS_MAC0 + 0x7ff;
 645
 646         /* Set cpmac1 resources */
 647         cpmac_high_res[0].start = TITAN_REGS_MAC1;
 648         cpmac_high_res[0].end = TITAN_REGS_MAC1 + 0x7ff;
 649 }
 650
 651 static int __init ar7_register_devices(void)
 652 {
 653         void __iomem *bootcr;
 654         u32 val;
 655         int res;
 656
 657         res = ar7_register_uarts();
 658         if (res)
 659                 pr_err("unable to setup uart(s): %d\n", res);
 660
 661         res = platform_device_register(&physmap_flash);
 662         if (res)
 663                 pr_warn("unable to register physmap-flash: %d\n", res);
 664
 665         if (ar7_is_titan())
 666                 titan_fixup_devices();
 667
 668         ar7_device_disable(vlynq_low_data.reset_bit);
 669         res = platform_device_register(&vlynq_low);
 670         if (res)
 671                 pr_warn("unable to register vlynq-low: %d\n", res);
 672
 673         if (ar7_has_high_vlynq()) {
 674                 ar7_device_disable(vlynq_high_data.reset_bit);
 675                 res = platform_device_register(&vlynq_high);
 676                 if (res)
 677                         pr_warn("unable to register vlynq-high: %d\n", res);
 678         }
 679
 680         if (ar7_has_high_cpmac()) {
 681                 res = fixed_phy_add(PHY_POLL, cpmac_high.id, &fixed_phy_status);
 682                 if (!res) {
 683                         cpmac_get_mac(1, cpmac_high_data.dev_addr);
 684
 685                         res = platform_device_register(&cpmac_high);
 686                         if (res)
 687                                 pr_warn("unable to register cpmac-high: %d\n",
 688                                         res);
 689                 } else
 690                         pr_warn("unable to add cpmac-high phy: %d\n", res);
 691         } else
 692                 cpmac_low_data.phy_mask = 0xffffffff;
 693
 694         res = fixed_phy_add(PHY_POLL, cpmac_low.id, &fixed_phy_status);
 695         if (!res) {
 696                 cpmac_get_mac(0, cpmac_low_data.dev_addr);
 697                 res = platform_device_register(&cpmac_low);
 698                 if (res)
 699                         pr_warn("unable to register cpmac-low: %d\n", res);
 700         } else
 701                 pr_warn("unable to add cpmac-low phy: %d\n", res);
 702
 703         detect_leds();
 704         res = platform_device_register(&ar7_gpio_leds);
 705         if (res)
 706                 pr_warn("unable to register leds: %d\n", res);
 707
 708         res = platform_device_register(&ar7_udc);
 709         if (res)
 710                 pr_warn("unable to register usb slave: %d\n", res);
 711
 712         /* Register watchdog only if enabled in hardware */
 713         bootcr = ioremap_nocache(AR7_REGS_DCL, 4);
 714         val = readl(bootcr);
 715         iounmap(bootcr);
 716         if (val & AR7_WDT_HW_ENA) {
 717                 if (ar7_has_high_vlynq())
 718                         ar7_wdt_res.start = UR8_REGS_WDT;
 719                 else
 720                         ar7_wdt_res.start = AR7_REGS_WDT;
 721
 722                 ar7_wdt_res.end = ar7_wdt_res.start + 0x20;
 723                 res = platform_device_register(&ar7_wdt);
 724                 if (res)
 725                         pr_warn("unable to register watchdog: %d\n", res);
 726         }
 727
 728         return 0;
 729 }
 730 device_initcall(ar7_register_devices);