target/linux/atheros/files/arch/mips/atheros/ar5312/board.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003 Atheros Communications, Inc.,  All Rights Reserved.
   7  * Copyright (C) 2006 FON Technology, SL.
   8  * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
   9  * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  10  */
  11
  12 /*
  13  * Platform devices for Atheros SoCs
  14  */
  15
  16 #include <linux/autoconf.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/mtd/physmap.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/kernel.h>
  24 #include <linux/reboot.h>
  25 #include <asm/bootinfo.h>
  26 #include <asm/reboot.h>
  27 #include <asm/time.h>
  28 #include <asm/irq.h>
  29 #include <asm/io.h>
  30 #include <ar531x.h>
  31 #include <linux/leds.h>
  32
  33 #define NO_PHY 0x1f
  34
  35 static int is_5312 = 0;
  36 static struct platform_device *ar5312_devs[6];
  37
  38 static struct resource ar5312_eth0_res[] = {
  39         {
  40                 .name = "eth0_membase",
  41                 .flags = IORESOURCE_MEM,
  42                 .start = KSEG1ADDR(AR531X_ENET0),
  43                 .end = KSEG1ADDR(AR531X_ENET0 + 0x2000),
  44         },
  45         {
  46                 .name = "eth0_irq",
  47                 .flags = IORESOURCE_IRQ,
  48                 .start = AR5312_IRQ_ENET0_INTRS,
  49                 .end = AR5312_IRQ_ENET0_INTRS,
  50         },
  51 };
  52 static struct ar531x_eth ar5312_eth0_data = {
  53         .phy = NO_PHY,
  54         .mac = 0,
  55         .reset_base = AR531X_RESET,
  56         .reset_mac = AR531X_RESET_ENET0,
  57         .reset_phy = AR531X_RESET_EPHY0,
  58         .phy_base = KSEG1ADDR(AR531X_ENET0),
  59 };
  60
  61 static struct resource ar5312_eth1_res[] = {
  62         {
  63                 .name = "eth1_membase",
  64                 .flags = IORESOURCE_MEM,
  65                 .start = KSEG1ADDR(AR531X_ENET1),
  66                 .end = KSEG1ADDR(AR531X_ENET1 + 0x2000),
  67         },
  68         {
  69                 .name = "eth1_irq",
  70                 .flags = IORESOURCE_IRQ,
  71                 .start = AR5312_IRQ_ENET1_INTRS,
  72                 .end = AR5312_IRQ_ENET1_INTRS,
  73         },
  74 };
  75 static struct ar531x_eth ar5312_eth1_data = {
  76         .phy = NO_PHY,
  77         .mac = 1,
  78         .reset_base = AR531X_RESET,
  79         .reset_mac = AR531X_RESET_ENET1,
  80         .reset_phy = AR531X_RESET_EPHY1,
  81         .phy_base = KSEG1ADDR(AR531X_ENET1),
  82 };
  83
  84 static struct platform_device ar5312_eth[] = {
  85         {
  86                 .id = 0,
  87                 .name = "ar531x-eth",
  88                 .dev.platform_data = &ar5312_eth0_data,
  89                 .resource = ar5312_eth0_res,
  90                 .num_resources = ARRAY_SIZE(ar5312_eth0_res)
  91         },
  92         {
  93                 .id = 1,
  94                 .name = "ar531x-eth",
  95                 .dev.platform_data = &ar5312_eth1_data,
  96                 .resource = ar5312_eth1_res,
  97                 .num_resources = ARRAY_SIZE(ar5312_eth1_res)
  98         },
  99 };
 100
 101
 102 /*
 103  * AR2312/3 ethernet uses the PHY of ENET0, but the MAC
 104  * of ENET1. Atheros calls it 'twisted' for a reason :)
 105  */
 106 static struct resource ar231x_eth0_res[] = {
 107         {
 108                 .name = "eth0_membase",
 109                 .flags = IORESOURCE_MEM,
 110                 .start = KSEG1ADDR(AR531X_ENET1),
 111                 .end = KSEG1ADDR(AR531X_ENET1 + 0x2000),
 112         },
 113         {
 114                 .name = "eth0_irq",
 115                 .flags = IORESOURCE_IRQ,
 116                 .start = AR5312_IRQ_ENET1_INTRS,
 117                 .end = AR5312_IRQ_ENET1_INTRS,
 118         },
 119 };
 120 static struct ar531x_eth ar231x_eth0_data = {
 121         .phy = 1,
 122         .mac = 1,
 123         .reset_base = AR531X_RESET,
 124         .reset_mac = AR531X_RESET_ENET1,
 125         .reset_phy = AR531X_RESET_EPHY1,
 126         .phy_base = KSEG1ADDR(AR531X_ENET0),
 127 };
 128 static struct platform_device ar231x_eth0 = {
 129         .id = 0,
 130         .name = "ar531x-eth",
 131         .dev.platform_data = &ar231x_eth0_data,
 132         .resource = ar231x_eth0_res,
 133         .num_resources = ARRAY_SIZE(ar231x_eth0_res)
 134 };
 135
 136
 137 static struct platform_device ar5312_wmac[] = {
 138         {
 139                 .id = 0,
 140                 .name = "ar531x-wmac",
 141         },
 142         {
 143                 .id = 1,
 144                 .name = "ar531x-wmac",
 145         },
 146 };
 147
 148 static struct physmap_flash_data ar5312_flash_data = {
 149         .width    = 2,
 150 };
 151
 152 static struct resource ar5312_flash_resource = {
 153         .start  = AR531X_FLASH,
 154         .end    = AR531X_FLASH + 0x800000 - 1,
 155         .flags  = IORESOURCE_MEM,
 156 };
 157
 158 static struct platform_device ar5312_physmap_flash = {
 159         .name      = "physmap-flash",
 160         .id      = 0,
 161         .dev            = {
 162                 .platform_data  = &ar5312_flash_data,
 163         },
 164         .num_resources  = 1,
 165         .resource   = &ar5312_flash_resource,
 166 };
 167
 168 #ifdef CONFIG_LEDS_GPIO
 169 static struct gpio_led ar5312_leds[] = {
 170         { .name = "wlan", .gpio = 0, .active_low = 1, },
 171 };
 172
 173 static const struct gpio_led_platform_data ar5312_led_data = {
 174         .num_leds = ARRAY_SIZE(ar5312_leds),
 175         .leds = (void *) ar5312_leds,
 176 };
 177
 178 static struct platform_device ar5312_gpio_leds = {
 179         .name = "leds-gpio",
 180         .id = -1,
 181         .dev = {
 182                 .platform_data = (void *) &ar5312_led_data,
 183         }
 184 };
 185 #endif
 186
 187 /*
 188  * NB: This mapping size is larger than the actual flash size,
 189  * but this shouldn't be a problem here, because the flash
 190  * will simply be mapped multiple times.
 191  */
 192 static char __init *ar5312_flash_limit(void)
 193 {
 194         u32 ctl;
 195         /*
 196          * Configure flash bank 0.
 197          * Assume 8M window size. Flash will be aliased if it's smaller
 198          */
 199         ctl = FLASHCTL_E |
 200                 FLASHCTL_AC_8M |
 201                 FLASHCTL_RBLE |
 202                 (0x01 << FLASHCTL_IDCY_S) |
 203                 (0x07 << FLASHCTL_WST1_S) |
 204                 (0x07 << FLASHCTL_WST2_S) |
 205                 (sysRegRead(AR531X_FLASHCTL0) & FLASHCTL_MW);
 206
 207         sysRegWrite(AR531X_FLASHCTL0, ctl);
 208
 209         /* Disable other flash banks */
 210         sysRegWrite(AR531X_FLASHCTL1,
 211                 sysRegRead(AR531X_FLASHCTL1) & ~(FLASHCTL_E | FLASHCTL_AC));
 212
 213         sysRegWrite(AR531X_FLASHCTL2,
 214                 sysRegRead(AR531X_FLASHCTL2) & ~(FLASHCTL_E | FLASHCTL_AC));
 215
 216         return (char *) KSEG1ADDR(AR531X_FLASH + 0x800000);
 217 }
 218
 219 static struct ar531x_config __init *init_wmac(int unit)
 220 {
 221         struct ar531x_config *config;
 222
 223         config = (struct ar531x_config *) kzalloc(sizeof(struct ar531x_config), GFP_KERNEL);
 224         config->board = board_config;
 225         config->radio = radio_config;
 226         config->unit = unit;
 227         config->tag = (u_int16_t) ((sysRegRead(AR531X_REV) >> AR531X_REV_WMAC_MIN_S) & AR531X_REV_CHIP);
 228
 229         return config;
 230 }
 231
 232 int __init ar5312_init_devices(void)
 233 {
 234         struct ar531x_boarddata *bcfg;
 235         char *radio, *c;
 236         int dev = 0;
 237         uint32_t fctl = 0;
 238
 239         if (!is_5312)
 240                 return 0;
 241
 242         /* Locate board/radio config data */
 243         ar531x_find_config(ar5312_flash_limit());
 244         bcfg = (struct ar531x_boarddata *) board_config;
 245
 246
 247         /*
 248          * Chip IDs and hardware detection for some Atheros
 249          * models are really broken!
 250          *
 251          * Atheros uses a disabled WMAC0 and Silicon ID of AR5312
 252          * as indication for AR2312, which is otherwise
 253          * indistinguishable from the real AR5312.
 254          */
 255         if (radio_config) {
 256                 radio = radio_config + AR531X_RADIO_MASK_OFF;
 257                 if ((*((u32 *) radio) & AR531X_RADIO0_MASK) == 0)
 258                         bcfg->config |= BD_ISCASPER;
 259         } else
 260                 radio = NULL;
 261
 262         /* AR2313 has CPU minor rev. 10 */
 263         if ((current_cpu_data.processor_id & 0xff) == 0x0a)
 264                 mips_machtype = MACH_ATHEROS_AR2313;
 265
 266         /* AR2312 shares the same Silicon ID as AR5312 */
 267         else if (bcfg->config & BD_ISCASPER)
 268                 mips_machtype = MACH_ATHEROS_AR2312;
 269
 270         /* Everything else is probably AR5312 or compatible */
 271         else
 272                 mips_machtype = MACH_ATHEROS_AR5312;
 273
 274         ar5312_eth0_data.board_config = board_config;
 275         ar5312_eth1_data.board_config = board_config;
 276
 277         /* fixup flash width */
 278         fctl = sysRegRead(AR531X_FLASHCTL) & FLASHCTL_MW;
 279         switch (fctl) {
 280                 case FLASHCTL_MWx16:
 281                         ar5312_flash_data.width = 2;
 282                         break;
 283                 case FLASHCTL_MWx8:
 284                 default:
 285                         ar5312_flash_data.width = 1;
 286                         break;
 287         }
 288
 289         ar5312_devs[dev++] = &ar5312_physmap_flash;
 290
 291         ar5312_leds[0].gpio = bcfg->sysLedGpio;
 292         ar5312_devs[dev++] = &ar5312_gpio_leds;
 293
 294         if (!memcmp(bcfg->enet0Mac, "\xff\xff\xff\xff\xff\xff", 6))
 295                 memcpy(bcfg->enet0Mac, bcfg->enet1Mac, 6);
 296
 297         if (memcmp(bcfg->enet0Mac, bcfg->enet1Mac, 6) == 0) {
 298                 /* ENET0 and ENET1 have the same mac.
 299                  * Increment the one from ENET1 */
 300                 c = bcfg->enet1Mac + 5;
 301                 while ((c >= (char *) bcfg->enet1Mac) && !(++(*c)))
 302                         c--;
 303         }
 304
 305         switch(mips_machtype) {
 306                 case MACH_ATHEROS_AR5312:
 307                         ar5312_eth0_data.macaddr = bcfg->enet0Mac;
 308                         ar5312_eth1_data.macaddr = bcfg->enet1Mac;
 309                         ar5312_devs[dev++] = &ar5312_eth[0];
 310                         ar5312_devs[dev++] = &ar5312_eth[1];
 311                         break;
 312                 case MACH_ATHEROS_AR2312:
 313                 case MACH_ATHEROS_AR2313:
 314                         ar231x_eth0_data.macaddr = bcfg->enet0Mac;
 315                         ar5312_devs[dev++] = &ar231x_eth0;
 316                         ar5312_flash_data.width = 1;
 317                         break;
 318         }
 319
 320         if (radio) {
 321                 if (mips_machtype == MACH_ATHEROS_AR5312) {
 322                         if (*((u32 *) radio) & AR531X_RADIO0_MASK) {
 323                                 ar5312_wmac[0].dev.platform_data = init_wmac(0);
 324                                 ar5312_devs[dev++] = &ar5312_wmac[0];
 325                         }
 326                 }
 327                 if (*((u32 *) radio) & AR531X_RADIO1_MASK) {
 328                         ar5312_wmac[1].dev.platform_data = init_wmac(1);
 329                         ar5312_devs[dev++] = &ar5312_wmac[1];
 330                 }
 331         }
 332
 333         return platform_add_devices(ar5312_devs, dev);
 334 }
 335
 336
 337 static void ar5312_halt(void)
 338 {
 339          while (1);
 340 }
 341
 342 static void ar5312_power_off(void)
 343 {
 344          ar5312_halt();
 345 }
 346
 347
 348 static void ar5312_restart(char *command)
 349 {
 350         /* reset the system */
 351         for(;;) sysRegWrite(AR531X_RESET, AR531X_RESET_SYSTEM);
 352 }
 353
 354
 355 /*
 356  * This table is indexed by bits 5..4 of the CLOCKCTL1 register
 357  * to determine the predevisor value.
 358  */
 359 static int __initdata CLOCKCTL1_PREDIVIDE_TABLE[4] = {
 360         1,
 361         2,
 362         4,
 363         5
 364 };
 365
 366
 367 static unsigned int __init ar5312_cpu_frequency(void)
 368 {
 369         unsigned int result;
 370         unsigned int predivide_mask, predivide_shift;
 371         unsigned int multiplier_mask, multiplier_shift;
 372         unsigned int clockCtl1, preDivideSelect, preDivisor, multiplier;
 373         unsigned int doubler_mask;
 374         unsigned int wisoc_revision;
 375
 376         /* Trust the bootrom's idea of cpu frequency. */
 377         if ((result = sysRegRead(AR5312_SCRATCH)))
 378                 return result;
 379
 380         wisoc_revision = (sysRegRead(AR531X_REV) & AR531X_REV_MAJ) >> AR531X_REV_MAJ_S;
 381         if (wisoc_revision == AR531X_REV_MAJ_AR2313) {
 382                 predivide_mask = AR2313_CLOCKCTL1_PREDIVIDE_MASK;
 383                 predivide_shift = AR2313_CLOCKCTL1_PREDIVIDE_SHIFT;
 384                 multiplier_mask = AR2313_CLOCKCTL1_MULTIPLIER_MASK;
 385                 multiplier_shift = AR2313_CLOCKCTL1_MULTIPLIER_SHIFT;
 386                 doubler_mask = AR2313_CLOCKCTL1_DOUBLER_MASK;
 387         } else { /* AR5312 and AR2312 */
 388                 predivide_mask = AR5312_CLOCKCTL1_PREDIVIDE_MASK;
 389                 predivide_shift = AR5312_CLOCKCTL1_PREDIVIDE_SHIFT;
 390                 multiplier_mask = AR5312_CLOCKCTL1_MULTIPLIER_MASK;
 391                 multiplier_shift = AR5312_CLOCKCTL1_MULTIPLIER_SHIFT;
 392                 doubler_mask = AR5312_CLOCKCTL1_DOUBLER_MASK;
 393         }
 394
 395         /*
 396          * Clocking is derived from a fixed 40MHz input clock.
 397          *
 398          *  cpuFreq = InputClock * MULT (where MULT is PLL multiplier)
 399          *  sysFreq = cpuFreq / 4          (used for APB clock, serial,
 400          *                                                         flash, Timer, Watchdog Timer)
 401          *
 402          *  cntFreq = cpuFreq / 2          (use for CPU count/compare)
 403          *
 404          * So, for example, with a PLL multiplier of 5, we have
 405          *
 406          *  cpuFreq = 200MHz
 407          *  sysFreq = 50MHz
 408          *  cntFreq = 100MHz
 409          *
 410          * We compute the CPU frequency, based on PLL settings.
 411          */
 412
 413         clockCtl1 = sysRegRead(AR5312_CLOCKCTL1);
 414         preDivideSelect = (clockCtl1 & predivide_mask) >> predivide_shift;
 415         preDivisor = CLOCKCTL1_PREDIVIDE_TABLE[preDivideSelect];
 416         multiplier = (clockCtl1 & multiplier_mask) >> multiplier_shift;
 417
 418         if (clockCtl1 & doubler_mask) {
 419                 multiplier = multiplier << 1;
 420         }
 421         return (40000000 / preDivisor) * multiplier;
 422 }
 423
 424 static inline int ar5312_sys_frequency(void)
 425 {
 426         return ar5312_cpu_frequency() / 4;
 427 }
 428
 429 static void __init ar5312_time_init(void)
 430 {
 431         mips_hpt_frequency = ar5312_cpu_frequency() / 2;
 432 }
 433
 434
 435 void __init ar5312_prom_init(void)
 436 {
 437         u32 memsize, memcfg, bank0AC, bank1AC;
 438
 439         is_5312 = 1;
 440
 441         /* Detect memory size */
 442         memcfg = sysRegRead(AR531X_MEM_CFG1);
 443         bank0AC = (memcfg & MEM_CFG1_AC0) >> MEM_CFG1_AC0_S;
 444         bank1AC = (memcfg & MEM_CFG1_AC1) >> MEM_CFG1_AC1_S;
 445         memsize = (bank0AC ? (1 << (bank0AC+1)) : 0)
 446                 + (bank1AC ? (1 << (bank1AC+1)) : 0);
 447         memsize <<= 20;
 448         add_memory_region(0, memsize, BOOT_MEM_RAM);
 449
 450         /* Initialize it to AR5312 for now. Real detection will be done
 451          * in ar5312_init_devices() */
 452         mips_machtype = MACH_ATHEROS_AR5312;
 453 }
 454
 455 void __init ar5312_plat_setup(void)
 456 {
 457         /* Clear any lingering AHB errors */
 458         sysRegRead(AR531X_PROCADDR);
 459         sysRegRead(AR531X_DMAADDR);
 460         sysRegWrite(AR531X_WD_CTRL, AR531X_WD_CTRL_IGNORE_EXPIRATION);
 461
 462         board_time_init = ar5312_time_init;
 463
 464         _machine_restart = ar5312_restart;
 465         _machine_halt = ar5312_halt;
 466         pm_power_off = ar5312_power_off;
 467
 468         serial_setup(KSEG1ADDR(AR531X_UART0), ar5312_sys_frequency());
 469 }
 470
 471 arch_initcall(ar5312_init_devices);