target/linux/atheros-2.6/files/arch/mips/atheros/ar5312.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 + 0x400000 - 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
 219         if (!is_5312)
 220                 return 0;
 221
 222         /* Locate board/radio config data */
 223         ar531x_find_config(ar5312_flash_limit());
 224         bcfg = (struct ar531x_boarddata *) board_config;
 225
 226
 227         /*
 228          * Chip IDs and hardware detection for some Atheros
 229          * models are really broken!
 230          *
 231          * Atheros uses a disabled WMAC0 and Silicon ID of AR5312
 232          * as indication for AR2312, which is otherwise
 233          * indistinguishable from the real AR5312.
 234          */
 235         if (radio_config) {
 236                 radio = radio_config + AR531X_RADIO_MASK_OFF;
 237                 if ((*((u32 *) radio) & AR531X_RADIO0_MASK) == 0)
 238                         bcfg->config |= BD_ISCASPER;
 239         } else
 240                 radio = NULL;
 241
 242         /* AR2313 has CPU minor rev. 10 */
 243         if ((current_cpu_data.processor_id & 0xff) == 0x0a)
 244                 mips_machtype = MACH_ATHEROS_AR2313;
 245
 246         /* AR2312 shares the same Silicon ID as AR5312 */
 247         else if (bcfg->config & BD_ISCASPER)
 248                 mips_machtype = MACH_ATHEROS_AR2312;
 249
 250         /* Everything else is probably AR5312 or compatible */
 251         else
 252                 mips_machtype = MACH_ATHEROS_AR5312;
 253
 254         ar5312_eth0_data.board_config = board_config;
 255         ar5312_eth1_data.board_config = board_config;
 256         ar5312_devs[dev++] = &ar5312_physmap_flash;
 257
 258         if (!memcmp(bcfg->enet0Mac, "\xff\xff\xff\xff\xff\xff", 6))
 259                 memcpy(bcfg->enet0Mac, bcfg->enet1Mac, 6);
 260
 261         if (memcmp(bcfg->enet0Mac, bcfg->enet1Mac, 6) == 0) {
 262                 /* ENET0 and ENET1 have the same mac.
 263                  * Increment the one from ENET1 */
 264                 c = bcfg->enet1Mac + 5;
 265                 while ((c >= (char *) bcfg->enet1Mac) && !(++(*c)))
 266                         c--;
 267         }
 268
 269         switch(mips_machtype) {
 270                 case MACH_ATHEROS_AR5312:
 271                         ar5312_eth0_data.macaddr = bcfg->enet0Mac;
 272                         ar5312_eth1_data.macaddr = bcfg->enet1Mac;
 273                         ar5312_devs[dev++] = &ar5312_eth[0];
 274                         ar5312_devs[dev++] = &ar5312_eth[1];
 275                         break;
 276                 case MACH_ATHEROS_AR2312:
 277                 case MACH_ATHEROS_AR2313:
 278                         ar231x_eth0_data.macaddr = bcfg->enet0Mac;
 279                         ar5312_devs[dev++] = &ar231x_eth0;
 280                         ar5312_flash_data.width = 1;
 281                         break;
 282         }
 283
 284         if (radio) {
 285                 if (mips_machtype == MACH_ATHEROS_AR5312) {
 286                         if (*((u32 *) radio) & AR531X_RADIO0_MASK) {
 287                                 ar5312_wmac[0].dev.platform_data = init_wmac(0);
 288                                 ar5312_devs[dev++] = &ar5312_wmac[0];
 289                         }
 290                 }
 291                 if (*((u32 *) radio) & AR531X_RADIO1_MASK) {
 292                         ar5312_wmac[1].dev.platform_data = init_wmac(1);
 293                         ar5312_devs[dev++] = &ar5312_wmac[1];
 294                 }
 295         }
 296
 297         return platform_add_devices(ar5312_devs, dev);
 298 }
 299
 300
 301 /*
 302  * Called when an interrupt is received, this function
 303  * determines exactly which interrupt it was, and it
 304  * invokes the appropriate handler.
 305  *
 306  * Implicitly, we also define interrupt priority by
 307  * choosing which to dispatch first.
 308  */
 309 asmlinkage void ar5312_irq_dispatch(void)
 310 {
 311         int pending = read_c0_status() & read_c0_cause();
 312
 313         if (pending & CAUSEF_IP2)
 314                 do_IRQ(AR5312_IRQ_WLAN0_INTRS);
 315         else if (pending & CAUSEF_IP3)
 316                 do_IRQ(AR5312_IRQ_ENET0_INTRS);
 317         else if (pending & CAUSEF_IP4)
 318                 do_IRQ(AR5312_IRQ_ENET1_INTRS);
 319         else if (pending & CAUSEF_IP5)
 320                 do_IRQ(AR5312_IRQ_WLAN1_INTRS);
 321         else if (pending & CAUSEF_IP6) {
 322                 unsigned int ar531x_misc_intrs = sysRegRead(AR531X_ISR) & sysRegRead(AR531X_IMR);
 323
 324                 if (ar531x_misc_intrs & AR531X_ISR_TIMER) {
 325                         do_IRQ(AR531X_MISC_IRQ_TIMER);
 326                         (void)sysRegRead(AR531X_TIMER);
 327                 } else if (ar531x_misc_intrs & AR531X_ISR_AHBPROC)
 328                         do_IRQ(AR531X_MISC_IRQ_AHB_PROC);
 329                 else if ((ar531x_misc_intrs & AR531X_ISR_UART0))
 330                         do_IRQ(AR531X_MISC_IRQ_UART0);
 331                 else if (ar531x_misc_intrs & AR531X_ISR_WD)
 332                         do_IRQ(AR531X_MISC_IRQ_WATCHDOG);
 333                 else
 334                         do_IRQ(AR531X_MISC_IRQ_NONE);
 335         } else if (pending & CAUSEF_IP7) {
 336                 do_IRQ(AR531X_IRQ_CPU_CLOCK);
 337         }
 338         else
 339                 do_IRQ(AR531X_IRQ_NONE);
 340 }
 341
 342 static void ar5312_halt(void)
 343 {
 344          while (1);
 345 }
 346
 347 static void ar5312_power_off(void)
 348 {
 349          ar5312_halt();
 350 }
 351
 352
 353 static void ar5312_restart(char *command)
 354 {
 355         /* reset the system */
 356         for(;;) sysRegWrite(AR531X_RESET, AR531X_RESET_SYSTEM);
 357 }
 358
 359
 360 /*
 361  * This table is indexed by bits 5..4 of the CLOCKCTL1 register
 362  * to determine the predevisor value.
 363  */
 364 static int __initdata CLOCKCTL1_PREDIVIDE_TABLE[4] = {
 365         1,
 366         2,
 367         4,
 368         5
 369 };
 370
 371
 372 static unsigned int __init ar5312_cpu_frequency(void)
 373 {
 374         unsigned int result;
 375         unsigned int predivide_mask, predivide_shift;
 376         unsigned int multiplier_mask, multiplier_shift;
 377         unsigned int clockCtl1, preDivideSelect, preDivisor, multiplier;
 378         unsigned int doubler_mask;
 379         unsigned int wisoc_revision;
 380
 381         /* Trust the bootrom's idea of cpu frequency. */
 382         if ((result = sysRegRead(AR5312_SCRATCH)))
 383                 return result;
 384
 385         wisoc_revision = (sysRegRead(AR531X_REV) & AR531X_REV_MAJ) >> AR531X_REV_MAJ_S;
 386         if (wisoc_revision == AR531X_REV_MAJ_AR2313) {
 387                 predivide_mask = AR2313_CLOCKCTL1_PREDIVIDE_MASK;
 388                 predivide_shift = AR2313_CLOCKCTL1_PREDIVIDE_SHIFT;
 389                 multiplier_mask = AR2313_CLOCKCTL1_MULTIPLIER_MASK;
 390                 multiplier_shift = AR2313_CLOCKCTL1_MULTIPLIER_SHIFT;
 391                 doubler_mask = AR2313_CLOCKCTL1_DOUBLER_MASK;
 392         } else { /* AR5312 and AR2312 */
 393                 predivide_mask = AR5312_CLOCKCTL1_PREDIVIDE_MASK;
 394                 predivide_shift = AR5312_CLOCKCTL1_PREDIVIDE_SHIFT;
 395                 multiplier_mask = AR5312_CLOCKCTL1_MULTIPLIER_MASK;
 396                 multiplier_shift = AR5312_CLOCKCTL1_MULTIPLIER_SHIFT;
 397                 doubler_mask = AR5312_CLOCKCTL1_DOUBLER_MASK;
 398         }
 399
 400         /*
 401          * Clocking is derived from a fixed 40MHz input clock.
 402          *
 403          *  cpuFreq = InputClock * MULT (where MULT is PLL multiplier)
 404          *  sysFreq = cpuFreq / 4          (used for APB clock, serial,
 405          *                                                         flash, Timer, Watchdog Timer)
 406          *
 407          *  cntFreq = cpuFreq / 2          (use for CPU count/compare)
 408          *
 409          * So, for example, with a PLL multiplier of 5, we have
 410          *
 411          *  cpuFreq = 200MHz
 412          *  sysFreq = 50MHz
 413          *  cntFreq = 100MHz
 414          *
 415          * We compute the CPU frequency, based on PLL settings.
 416          */
 417
 418         clockCtl1 = sysRegRead(AR5312_CLOCKCTL1);
 419         preDivideSelect = (clockCtl1 & predivide_mask) >> predivide_shift;
 420         preDivisor = CLOCKCTL1_PREDIVIDE_TABLE[preDivideSelect];
 421         multiplier = (clockCtl1 & multiplier_mask) >> multiplier_shift;
 422
 423         if (clockCtl1 & doubler_mask) {
 424                 multiplier = multiplier << 1;
 425         }
 426         return (40000000 / preDivisor) * multiplier;
 427 }
 428
 429 static inline int ar5312_sys_frequency(void)
 430 {
 431         return ar5312_cpu_frequency() / 4;
 432 }
 433
 434 static void __init ar5312_time_init(void)
 435 {
 436         mips_hpt_frequency = ar5312_cpu_frequency() / 2;
 437 }
 438
 439
 440 /* Enable the specified AR531X_MISC_IRQ interrupt */
 441 static void
 442 ar5312_misc_intr_enable(unsigned int irq)
 443 {
 444         unsigned int imr;
 445
 446         imr = sysRegRead(AR531X_IMR);
 447         imr |= (1 << (irq - AR531X_MISC_IRQ_BASE - 1));
 448         sysRegWrite(AR531X_IMR, imr);
 449         sysRegRead(AR531X_IMR); /* flush write buffer */
 450 }
 451
 452 /* Disable the specified AR531X_MISC_IRQ interrupt */
 453 static void
 454 ar5312_misc_intr_disable(unsigned int irq)
 455 {
 456         unsigned int imr;
 457
 458         imr = sysRegRead(AR531X_IMR);
 459         imr &= ~(1 << (irq - AR531X_MISC_IRQ_BASE - 1));
 460         sysRegWrite(AR531X_IMR, imr);
 461         sysRegRead(AR531X_IMR); /* flush write buffer */
 462 }
 463
 464 /* Turn on the specified AR531X_MISC_IRQ interrupt */
 465 static unsigned int
 466 ar5312_misc_intr_startup(unsigned int irq)
 467 {
 468         ar5312_misc_intr_enable(irq);
 469         return 0;
 470 }
 471
 472 /* Turn off the specified AR531X_MISC_IRQ interrupt */
 473 static void
 474 ar5312_misc_intr_shutdown(unsigned int irq)
 475 {
 476         ar5312_misc_intr_disable(irq);
 477 }
 478
 479 static void
 480 ar5312_misc_intr_ack(unsigned int irq)
 481 {
 482         ar5312_misc_intr_disable(irq);
 483 }
 484
 485 static void
 486 ar5312_misc_intr_end(unsigned int irq)
 487 {
 488         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 489                 ar5312_misc_intr_enable(irq);
 490 }
 491
 492 static struct irq_chip ar5312_misc_intr_controller = {
 493         .typename       = "AR5312 misc",
 494         .startup        = ar5312_misc_intr_startup,
 495         .shutdown       = ar5312_misc_intr_shutdown,
 496         .enable         = ar5312_misc_intr_enable,
 497         .disable        = ar5312_misc_intr_disable,
 498         .ack            = ar5312_misc_intr_ack,
 499         .end            = ar5312_misc_intr_end,
 500 };
 501
 502 static irqreturn_t ar5312_ahb_proc_handler(int cpl, void *dev_id)
 503 {
 504         u32 proc1 = sysRegRead(AR531X_PROC1);
 505         u32 procAddr = sysRegRead(AR531X_PROCADDR); /* clears error state */
 506         u32 dma1 = sysRegRead(AR531X_DMA1);
 507         u32 dmaAddr = sysRegRead(AR531X_DMAADDR);   /* clears error state */
 508
 509         printk("AHB interrupt: PROCADDR=0x%8.8x  PROC1=0x%8.8x  DMAADDR=0x%8.8x  DMA1=0x%8.8x\n",
 510                         procAddr, proc1, dmaAddr, dma1);
 511
 512         machine_restart("AHB error"); /* Catastrophic failure */
 513         return IRQ_HANDLED;
 514 }
 515
 516
 517 static struct irqaction ar5312_ahb_proc_interrupt  = {
 518         .handler        = ar5312_ahb_proc_handler,
 519         .flags          = SA_INTERRUPT,
 520         .name           = "ar5312_ahb_proc_interrupt",
 521 };
 522
 523
 524 static struct irqaction cascade  = {
 525         .handler        = no_action,
 526         .flags          = SA_INTERRUPT,
 527         .name           = "cascade",
 528 };
 529
 530 void __init ar5312_misc_intr_init(int irq_base)
 531 {
 532         int i;
 533
 534         for (i = irq_base; i < irq_base + AR531X_MISC_IRQ_COUNT; i++) {
 535                 irq_desc[i].status = IRQ_DISABLED;
 536                 irq_desc[i].action = NULL;
 537                 irq_desc[i].depth = 1;
 538                 irq_desc[i].chip = &ar5312_misc_intr_controller;
 539         }
 540         setup_irq(AR531X_MISC_IRQ_AHB_PROC, &ar5312_ahb_proc_interrupt);
 541         setup_irq(AR5312_IRQ_MISC_INTRS, &cascade);
 542 }
 543
 544 void __init ar5312_prom_init(void)
 545 {
 546         u32 memsize, memcfg, bank0AC, bank1AC;
 547
 548         is_5312 = 1;
 549
 550         /* Detect memory size */
 551         memcfg = sysRegRead(AR531X_MEM_CFG1);
 552         bank0AC = (memcfg & MEM_CFG1_AC0) >> MEM_CFG1_AC0_S;
 553         bank1AC = (memcfg & MEM_CFG1_AC1) >> MEM_CFG1_AC1_S;
 554         memsize = (bank0AC ? (1 << (bank0AC+1)) : 0)
 555                 + (bank1AC ? (1 << (bank1AC+1)) : 0);
 556         memsize <<= 20;
 557         add_memory_region(0, memsize, BOOT_MEM_RAM);
 558
 559         /* Initialize it to AR5312 for now. Real detection will be done
 560          * in ar5312_init_devices() */
 561         mips_machtype = MACH_ATHEROS_AR5312;
 562 }
 563
 564 void __init ar5312_plat_setup(void)
 565 {
 566         /* Clear any lingering AHB errors */
 567         sysRegRead(AR531X_PROCADDR);
 568         sysRegRead(AR531X_DMAADDR);
 569         sysRegWrite(AR531X_WD_CTRL, AR531X_WD_CTRL_IGNORE_EXPIRATION);
 570
 571         board_time_init = ar5312_time_init;
 572
 573         _machine_restart = ar5312_restart;
 574         _machine_halt = ar5312_halt;
 575         pm_power_off = ar5312_power_off;
 576
 577         serial_setup(KSEG1ADDR(AR531X_UART0), ar5312_sys_frequency());
 578 }
 579
 580 arch_initcall(ar5312_init_devices);