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