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/delay.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/mtd/physmap.h>
  26 #include <linux/serial.h>
  27 #include <linux/serial_8250.h>
  28 #include <linux/ioport.h>
  29 #include <linux/io.h>
  30 #include <linux/vlynq.h>
  31 #include <linux/leds.h>
  32 #include <linux/string.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/phy.h>
  35 #include <linux/phy_fixed.h>
  36 #include <linux/gpio.h>
  37 #include <linux/clk.h>
  38
  39 #include <asm/addrspace.h>
  40 #include <asm/mach-ar7/ar7.h>
  41 #include <asm/mach-ar7/prom.h>
  42
  43 /*****************************************************************************
  44  * VLYNQ Bus
  45  ****************************************************************************/
  46 struct plat_vlynq_data {
  47         struct plat_vlynq_ops ops;
  48         int gpio_bit;
  49         int reset_bit;
  50 };
  51
  52 static int vlynq_on(struct vlynq_device *dev)
  53 {
  54         int ret;
  55         struct plat_vlynq_data *pdata = dev->dev.platform_data;
  56
  57         ret = gpio_request(pdata->gpio_bit, "vlynq");
  58         if (ret)
  59                 goto out;
  60
  61         ar7_device_reset(pdata->reset_bit);
  62
  63         ret = ar7_gpio_disable(pdata->gpio_bit);
  64         if (ret)
  65                 goto out_enabled;
  66
  67         ret = ar7_gpio_enable(pdata->gpio_bit);
  68         if (ret)
  69                 goto out_enabled;
  70
  71         ret = gpio_direction_output(pdata->gpio_bit, 0);
  72         if (ret)
  73                 goto out_gpio_enabled;
  74
  75         msleep(50);
  76
  77         gpio_set_value(pdata->gpio_bit, 1);
  78
  79         msleep(50);
  80
  81         return 0;
  82
  83 out_gpio_enabled:
  84         ar7_gpio_disable(pdata->gpio_bit);
  85 out_enabled:
  86         ar7_device_disable(pdata->reset_bit);
  87         gpio_free(pdata->gpio_bit);
  88 out:
  89         return ret;
  90 }
  91
  92 static void vlynq_off(struct vlynq_device *dev)
  93 {
  94         struct plat_vlynq_data *pdata = dev->dev.platform_data;
  95
  96         ar7_gpio_disable(pdata->gpio_bit);
  97         gpio_free(pdata->gpio_bit);
  98         ar7_device_disable(pdata->reset_bit);
  99 }
 100
 101 static struct resource vlynq_low_res[] = {
 102         {
 103                 .name   = "regs",
 104                 .flags  = IORESOURCE_MEM,
 105                 .start  = AR7_REGS_VLYNQ0,
 106                 .end    = AR7_REGS_VLYNQ0 + 0xff,
 107         },
 108         {
 109                 .name   = "irq",
 110                 .flags  = IORESOURCE_IRQ,
 111                 .start  = 29,
 112                 .end    = 29,
 113         },
 114         {
 115                 .name   = "mem",
 116                 .flags  = IORESOURCE_MEM,
 117                 .start  = 0x04000000,
 118                 .end    = 0x04ffffff,
 119         },
 120         {
 121                 .name   = "devirq",
 122                 .flags  = IORESOURCE_IRQ,
 123                 .start  = 80,
 124                 .end    = 111,
 125         },
 126 };
 127
 128 static struct resource vlynq_high_res[] = {
 129         {
 130                 .name   = "regs",
 131                 .flags  = IORESOURCE_MEM,
 132                 .start  = AR7_REGS_VLYNQ1,
 133                 .end    = AR7_REGS_VLYNQ1 + 0xff,
 134         },
 135         {
 136                 .name   = "irq",
 137                 .flags  = IORESOURCE_IRQ,
 138                 .start  = 33,
 139                 .end    = 33,
 140         },
 141         {
 142                 .name   = "mem",
 143                 .flags  = IORESOURCE_MEM,
 144                 .start  = 0x0c000000,
 145                 .end    = 0x0cffffff,
 146         },
 147         {
 148                 .name   = "devirq",
 149                 .flags  = IORESOURCE_IRQ,
 150                 .start  = 112,
 151                 .end    = 143,
 152         },
 153 };
 154
 155 static struct plat_vlynq_data vlynq_low_data = {
 156         .ops = {
 157                 .on     = vlynq_on,
 158                 .off    = vlynq_off,
 159         },
 160         .reset_bit      = 20,
 161         .gpio_bit       = 18,
 162 };
 163
 164 static struct plat_vlynq_data vlynq_high_data = {
 165         .ops = {
 166                 .on     = vlynq_on,
 167                 .off    = vlynq_off,
 168         },
 169         .reset_bit      = 16,
 170         .gpio_bit       = 19,
 171 };
 172
 173 static struct platform_device vlynq_low = {
 174         .id             = 0,
 175         .name           = "vlynq",
 176         .dev = {
 177                 .platform_data  = &vlynq_low_data,
 178         },
 179         .resource       = vlynq_low_res,
 180         .num_resources  = ARRAY_SIZE(vlynq_low_res),
 181 };
 182
 183 static struct platform_device vlynq_high = {
 184         .id             = 1,
 185         .name           = "vlynq",
 186         .dev = {
 187                 .platform_data  = &vlynq_high_data,
 188         },
 189         .resource       = vlynq_high_res,
 190         .num_resources  = ARRAY_SIZE(vlynq_high_res),
 191 };
 192
 193 /*****************************************************************************
 194  * Flash
 195  ****************************************************************************/
 196 static struct resource physmap_flash_resource = {
 197         .name   = "mem",
 198         .flags  = IORESOURCE_MEM,
 199         .start  = 0x10000000,
 200         .end    = 0x107fffff,
 201 };
 202
 203 static const char *ar7_probe_types[] = { "ar7part", NULL };
 204
 205 static struct physmap_flash_data physmap_flash_data = {
 206         .width  = 2,
 207         .part_probe_types = ar7_probe_types,
 208 };
 209
 210 static struct platform_device physmap_flash = {
 211         .name           = "physmap-flash",
 212         .dev = {
 213                 .platform_data  = &physmap_flash_data,
 214         },
 215         .resource       = &physmap_flash_resource,
 216         .num_resources  = 1,
 217 };
 218
 219 /*****************************************************************************
 220  * Ethernet
 221  ****************************************************************************/
 222 static struct resource cpmac_low_res[] = {
 223         {
 224                 .name   = "regs",
 225                 .flags  = IORESOURCE_MEM,
 226                 .start  = AR7_REGS_MAC0,
 227                 .end    = AR7_REGS_MAC0 + 0x7ff,
 228         },
 229         {
 230                 .name   = "irq",
 231                 .flags  = IORESOURCE_IRQ,
 232                 .start  = 27,
 233                 .end    = 27,
 234         },
 235 };
 236
 237 static struct resource cpmac_high_res[] = {
 238         {
 239                 .name   = "regs",
 240                 .flags  = IORESOURCE_MEM,
 241                 .start  = AR7_REGS_MAC1,
 242                 .end    = AR7_REGS_MAC1 + 0x7ff,
 243         },
 244         {
 245                 .name   = "irq",
 246                 .flags  = IORESOURCE_IRQ,
 247                 .start  = 41,
 248                 .end    = 41,
 249         },
 250 };
 251
 252 static struct fixed_phy_status fixed_phy_status __initdata = {
 253         .link           = 1,
 254         .speed          = 100,
 255         .duplex         = 1,
 256 };
 257
 258 static struct plat_cpmac_data cpmac_low_data = {
 259         .reset_bit      = 17,
 260         .power_bit      = 20,
 261         .phy_mask       = 0x80000000,
 262 };
 263
 264 static struct plat_cpmac_data cpmac_high_data = {
 265         .reset_bit      = 21,
 266         .power_bit      = 22,
 267         .phy_mask       = 0x7fffffff,
 268 };
 269
 270 static u64 cpmac_dma_mask = DMA_BIT_MASK(32);
 271
 272 static struct platform_device cpmac_low = {
 273         .id             = 0,
 274         .name           = "cpmac",
 275         .dev = {
 276                 .dma_mask               = &cpmac_dma_mask,
 277                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 278                 .platform_data          = &cpmac_low_data,
 279         },
 280         .resource       = cpmac_low_res,
 281         .num_resources  = ARRAY_SIZE(cpmac_low_res),
 282 };
 283
 284 static struct platform_device cpmac_high = {
 285         .id             = 1,
 286         .name           = "cpmac",
 287         .dev = {
 288                 .dma_mask               = &cpmac_dma_mask,
 289                 .coherent_dma_mask      = DMA_BIT_MASK(32),
 290                 .platform_data          = &cpmac_high_data,
 291         },
 292         .resource       = cpmac_high_res,
 293         .num_resources  = ARRAY_SIZE(cpmac_high_res),
 294 };
 295
 296 static void __init cpmac_get_mac(int instance, unsigned char *dev_addr)
 297 {
 298         char name[5], *mac;
 299
 300         sprintf(name, "mac%c", 'a' + instance);
 301         mac = prom_getenv(name);
 302         if (!mac && instance) {
 303                 sprintf(name, "mac%c", 'a');
 304                 mac = prom_getenv(name);
 305         }
 306
 307         if (mac) {
 308                 if (!mac_pton(mac, dev_addr)) {
 309                         pr_warn("cannot parse mac address, using random address\n");
 310                         eth_random_addr(dev_addr);
 311                 }
 312         } else
 313                 eth_random_addr(dev_addr);
 314 }
 315
 316 /*****************************************************************************
 317  * USB
 318  ****************************************************************************/
 319 static struct resource usb_res[] = {
 320         {
 321                 .name   = "regs",
 322                 .flags  = IORESOURCE_MEM,
 323                 .start  = AR7_REGS_USB,
 324                 .end    = AR7_REGS_USB + 0xff,
 325         },
 326         {
 327                 .name   = "irq",
 328                 .flags  = IORESOURCE_IRQ,
 329                 .start  = 32,
 330                 .end    = 32,
 331         },
 332         {
 333                 .name   = "mem",
 334                 .flags  = IORESOURCE_MEM,
 335                 .start  = 0x03400000,
 336                 .end    = 0x03401fff,
 337         },
 338 };
 339
 340 static struct platform_device ar7_udc = {
 341         .name           = "ar7_udc",
 342         .resource       = usb_res,
 343         .num_resources  = ARRAY_SIZE(usb_res),
 344 };
 345
 346 /*****************************************************************************
 347  * LEDs
 348  ****************************************************************************/
 349 static struct gpio_led default_leds[] = {
 350         {
 351                 .name                   = "status",
 352                 .gpio                   = 8,
 353                 .active_low             = 1,
 354         },
 355 };
 356
 357 static struct gpio_led titan_leds[] = {
 358         { .name = "status", .gpio = 8, .active_low = 1, },
 359         { .name = "wifi", .gpio = 13, .active_low = 1, },
 360 };
 361
 362 static struct gpio_led dsl502t_leds[] = {
 363         {
 364                 .name                   = "status",
 365                 .gpio                   = 9,
 366                 .active_low             = 1,
 367         },
 368         {
 369                 .name                   = "ethernet",
 370                 .gpio                   = 7,
 371                 .active_low             = 1,
 372         },
 373         {
 374                 .name                   = "usb",
 375                 .gpio                   = 12,
 376                 .active_low             = 1,
 377         },
 378 };
 379
 380 static struct gpio_led dg834g_leds[] = {
 381         {
 382                 .name                   = "ppp",
 383                 .gpio                   = 6,
 384                 .active_low             = 1,
 385         },
 386         {
 387                 .name                   = "status",
 388                 .gpio                   = 7,
 389                 .active_low             = 1,
 390         },
 391         {
 392                 .name                   = "adsl",
 393                 .gpio                   = 8,
 394                 .active_low             = 1,
 395         },
 396         {
 397                 .name                   = "wifi",
 398                 .gpio                   = 12,
 399                 .active_low             = 1,
 400         },
 401         {
 402                 .name                   = "power",
 403                 .gpio                   = 14,
 404                 .active_low             = 1,
 405                 .default_trigger        = "default-on",
 406         },
 407 };
 408
 409 static struct gpio_led fb_sl_leds[] = {
 410         {
 411                 .name                   = "1",
 412                 .gpio                   = 7,
 413         },
 414         {
 415                 .name                   = "2",
 416                 .gpio                   = 13,
 417                 .active_low             = 1,
 418         },
 419         {
 420                 .name                   = "3",
 421                 .gpio                   = 10,
 422                 .active_low             = 1,
 423         },
 424         {
 425                 .name                   = "4",
 426                 .gpio                   = 12,
 427                 .active_low             = 1,
 428         },
 429         {
 430                 .name                   = "5",
 431                 .gpio                   = 9,
 432                 .active_low             = 1,
 433         },
 434 };
 435
 436 static struct gpio_led fb_fon_leds[] = {
 437         {
 438                 .name                   = "1",
 439                 .gpio                   = 8,
 440         },
 441         {
 442                 .name                   = "2",
 443                 .gpio                   = 3,
 444                 .active_low             = 1,
 445         },
 446         {
 447                 .name                   = "3",
 448                 .gpio                   = 5,
 449         },
 450         {
 451                 .name                   = "4",
 452                 .gpio                   = 4,
 453                 .active_low             = 1,
 454         },
 455         {
 456                 .name                   = "5",
 457                 .gpio                   = 11,
 458                 .active_low             = 1,
 459         },
 460 };
 461
 462 static struct gpio_led gt701_leds[] = {
 463         {
 464                 .name                   = "inet:green",
 465                 .gpio                   = 13,
 466                 .active_low             = 1,
 467         },
 468         {
 469                 .name                   = "usb",
 470                 .gpio                   = 12,
 471                 .active_low             = 1,
 472         },
 473         {
 474                 .name                   = "inet:red",
 475                 .gpio                   = 9,
 476                 .active_low             = 1,
 477         },
 478         {
 479                 .name                   = "power:red",
 480                 .gpio                   = 7,
 481                 .active_low             = 1,
 482         },
 483         {
 484                 .name                   = "power:green",
 485                 .gpio                   = 8,
 486                 .active_low             = 1,
 487                 .default_trigger        = "default-on",
 488         },
 489         {
 490                 .name                   = "ethernet",
 491                 .gpio                   = 10,
 492                 .active_low             = 1,
 493         },
 494 };
 495
 496 static struct gpio_led_platform_data ar7_led_data;
 497
 498 static struct platform_device ar7_gpio_leds = {
 499         .name = "leds-gpio",
 500         .dev = {
 501                 .platform_data = &ar7_led_data,
 502         }
 503 };
 504
 505 static void __init detect_leds(void)
 506 {
 507         char *prid, *usb_prod;
 508
 509         /* Default LEDs */
 510         ar7_led_data.num_leds = ARRAY_SIZE(default_leds);
 511         ar7_led_data.leds = default_leds;
 512
 513         /* FIXME: the whole thing is unreliable */
 514         prid = prom_getenv("ProductID");
 515         usb_prod = prom_getenv("usb_prod");
 516
 517         /* If we can't get the product id from PROM, use the default LEDs */
 518         if (!prid)
 519                 return;
 520
 521         if (strstr(prid, "Fritz_Box_FON")) {
 522                 ar7_led_data.num_leds = ARRAY_SIZE(fb_fon_leds);
 523                 ar7_led_data.leds = fb_fon_leds;
 524         } else if (strstr(prid, "Fritz_Box_")) {
 525                 ar7_led_data.num_leds = ARRAY_SIZE(fb_sl_leds);
 526                 ar7_led_data.leds = fb_sl_leds;
 527         } else if ((!strcmp(prid, "AR7RD") || !strcmp(prid, "AR7DB"))
 528                 && usb_prod != NULL && strstr(usb_prod, "DSL-502T")) {
 529                 ar7_led_data.num_leds = ARRAY_SIZE(dsl502t_leds);
 530                 ar7_led_data.leds = dsl502t_leds;
 531         } else if (strstr(prid, "DG834")) {
 532                 ar7_led_data.num_leds = ARRAY_SIZE(dg834g_leds);
 533                 ar7_led_data.leds = dg834g_leds;
 534         } else if (strstr(prid, "CYWM") || strstr(prid, "CYWL")) {
 535                 ar7_led_data.num_leds = ARRAY_SIZE(titan_leds);
 536                 ar7_led_data.leds = titan_leds;
 537         } else if (strstr(prid, "GT701")) {
 538                 ar7_led_data.num_leds = ARRAY_SIZE(gt701_leds);
 539                 ar7_led_data.leds = gt701_leds;
 540         }
 541 }
 542
 543 /*****************************************************************************
 544  * Watchdog
 545  ****************************************************************************/
 546 static struct resource ar7_wdt_res = {
 547         .name           = "regs",
 548         .flags          = IORESOURCE_MEM,
 549         .start          = -1,   /* Filled at runtime */
 550         .end            = -1,   /* Filled at runtime */
 551 };
 552
 553 static struct platform_device ar7_wdt = {
 554         .name           = "ar7_wdt",
 555         .resource       = &ar7_wdt_res,
 556         .num_resources  = 1,
 557 };
 558
 559 /*****************************************************************************
 560  * Init
 561  ****************************************************************************/
 562 static int __init ar7_register_uarts(void)
 563 {
 564 #ifdef CONFIG_SERIAL_8250
 565         static struct uart_port uart_port __initdata;
 566         struct clk *bus_clk;
 567         int res;
 568
 569         memset(&uart_port, 0, sizeof(struct uart_port));
 570
 571         bus_clk = clk_get(NULL, "bus");
 572         if (IS_ERR(bus_clk))
 573                 panic("unable to get bus clk");
 574
 575         uart_port.type          = PORT_AR7;
 576         uart_port.uartclk       = clk_get_rate(bus_clk) / 2;
 577         uart_port.iotype        = UPIO_MEM32;
 578         uart_port.flags         = UPF_FIXED_TYPE | UPF_BOOT_AUTOCONF;
 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_gpio_init();
 658         if (res)
 659                 pr_warn("unable to register gpios: %d\n", res);
 660
 661         res = ar7_register_uarts();
 662         if (res)
 663                 pr_err("unable to setup uart(s): %d\n", res);
 664
 665         res = platform_device_register(&physmap_flash);
 666         if (res)
 667                 pr_warn("unable to register physmap-flash: %d\n", res);
 668
 669         if (ar7_is_titan())
 670                 titan_fixup_devices();
 671
 672         ar7_device_disable(vlynq_low_data.reset_bit);
 673         res = platform_device_register(&vlynq_low);
 674         if (res)
 675                 pr_warn("unable to register vlynq-low: %d\n", res);
 676
 677         if (ar7_has_high_vlynq()) {
 678                 ar7_device_disable(vlynq_high_data.reset_bit);
 679                 res = platform_device_register(&vlynq_high);
 680                 if (res)
 681                         pr_warn("unable to register vlynq-high: %d\n", res);
 682         }
 683
 684         if (ar7_has_high_cpmac()) {
 685                 res = fixed_phy_add(PHY_POLL, cpmac_high.id,
 686                                     &fixed_phy_status, -1);
 687                 if (!res) {
 688                         cpmac_get_mac(1, cpmac_high_data.dev_addr);
 689
 690                         res = platform_device_register(&cpmac_high);
 691                         if (res)
 692                                 pr_warn("unable to register cpmac-high: %d\n",
 693                                         res);
 694                 } else
 695                         pr_warn("unable to add cpmac-high phy: %d\n", res);
 696         } else
 697                 cpmac_low_data.phy_mask = 0xffffffff;
 698
 699         res = fixed_phy_add(PHY_POLL, cpmac_low.id, &fixed_phy_status, -1);
 700         if (!res) {
 701                 cpmac_get_mac(0, cpmac_low_data.dev_addr);
 702                 res = platform_device_register(&cpmac_low);
 703                 if (res)
 704                         pr_warn("unable to register cpmac-low: %d\n", res);
 705         } else
 706                 pr_warn("unable to add cpmac-low phy: %d\n", res);
 707
 708         detect_leds();
 709         res = platform_device_register(&ar7_gpio_leds);
 710         if (res)
 711                 pr_warn("unable to register leds: %d\n", res);
 712
 713         res = platform_device_register(&ar7_udc);
 714         if (res)
 715                 pr_warn("unable to register usb slave: %d\n", res);
 716
 717         /* Register watchdog only if enabled in hardware */
 718         bootcr = ioremap_nocache(AR7_REGS_DCL, 4);
 719         val = readl(bootcr);
 720         iounmap(bootcr);
 721         if (val & AR7_WDT_HW_ENA) {
 722                 if (ar7_has_high_vlynq())
 723                         ar7_wdt_res.start = UR8_REGS_WDT;
 724                 else
 725                         ar7_wdt_res.start = AR7_REGS_WDT;
 726
 727                 ar7_wdt_res.end = ar7_wdt_res.start + 0x20;
 728                 res = platform_device_register(&ar7_wdt);
 729                 if (res)
 730                         pr_warn("unable to register watchdog: %d\n", res);
 731         }
 732
 733         return 0;
 734 }
 735 device_initcall(ar7_register_devices);