drivers/mfd/asic3.c

   1 /*
   2  * driver/mfd/asic3.c
   3  *
   4  * Compaq ASIC3 support.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Copyright 2001 Compaq Computer Corporation.
  11  * Copyright 2004-2005 Phil Blundell
  12  * Copyright 2007-2008 OpenedHand Ltd.
  13  *
  14  * Authors: Phil Blundell <pb@handhelds.org>,
  15  *          Samuel Ortiz <sameo@openedhand.com>
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/delay.h>
  21 #include <linux/irq.h>
  22 #include <linux/gpio.h>
  23 #include <linux/io.h>
  24 #include <linux/slab.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <linux/mfd/asic3.h>
  29 #include <linux/mfd/core.h>
  30 #include <linux/mfd/ds1wm.h>
  31 #include <linux/mfd/tmio.h>
  32
  33 enum {
  34         ASIC3_CLOCK_SPI,
  35         ASIC3_CLOCK_OWM,
  36         ASIC3_CLOCK_PWM0,
  37         ASIC3_CLOCK_PWM1,
  38         ASIC3_CLOCK_LED0,
  39         ASIC3_CLOCK_LED1,
  40         ASIC3_CLOCK_LED2,
  41         ASIC3_CLOCK_SD_HOST,
  42         ASIC3_CLOCK_SD_BUS,
  43         ASIC3_CLOCK_SMBUS,
  44         ASIC3_CLOCK_EX0,
  45         ASIC3_CLOCK_EX1,
  46 };
  47
  48 struct asic3_clk {
  49         int enabled;
  50         unsigned int cdex;
  51         unsigned long rate;
  52 };
  53
  54 #define INIT_CDEX(_name, _rate) \
  55         [ASIC3_CLOCK_##_name] = {               \
  56                 .cdex = CLOCK_CDEX_##_name,     \
  57                 .rate = _rate,                  \
  58         }
  59
  60 struct asic3_clk asic3_clk_init[] __initdata = {
  61         INIT_CDEX(SPI, 0),
  62         INIT_CDEX(OWM, 5000000),
  63         INIT_CDEX(PWM0, 0),
  64         INIT_CDEX(PWM1, 0),
  65         INIT_CDEX(LED0, 0),
  66         INIT_CDEX(LED1, 0),
  67         INIT_CDEX(LED2, 0),
  68         INIT_CDEX(SD_HOST, 24576000),
  69         INIT_CDEX(SD_BUS, 12288000),
  70         INIT_CDEX(SMBUS, 0),
  71         INIT_CDEX(EX0, 32768),
  72         INIT_CDEX(EX1, 24576000),
  73 };
  74
  75 struct asic3 {
  76         void __iomem *mapping;
  77         unsigned int bus_shift;
  78         unsigned int irq_nr;
  79         unsigned int irq_base;
  80         spinlock_t lock;
  81         u16 irq_bothedge[4];
  82         struct gpio_chip gpio;
  83         struct device *dev;
  84         void __iomem *tmio_cnf;
  85
  86         struct asic3_clk clocks[ARRAY_SIZE(asic3_clk_init)];
  87 };
  88
  89 static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);
  90
  91 static inline void asic3_write_register(struct asic3 *asic,
  92                                  unsigned int reg, u32 value)
  93 {
  94         iowrite16(value, asic->mapping +
  95                   (reg >> asic->bus_shift));
  96 }
  97
  98 static inline u32 asic3_read_register(struct asic3 *asic,
  99                                unsigned int reg)
 100 {
 101         return ioread16(asic->mapping +
 102                         (reg >> asic->bus_shift));
 103 }
 104
 105 void asic3_set_register(struct asic3 *asic, u32 reg, u32 bits, bool set)
 106 {
 107         unsigned long flags;
 108         u32 val;
 109
 110         spin_lock_irqsave(&asic->lock, flags);
 111         val = asic3_read_register(asic, reg);
 112         if (set)
 113                 val |= bits;
 114         else
 115                 val &= ~bits;
 116         asic3_write_register(asic, reg, val);
 117         spin_unlock_irqrestore(&asic->lock, flags);
 118 }
 119
 120 /* IRQs */
 121 #define MAX_ASIC_ISR_LOOPS    20
 122 #define ASIC3_GPIO_BASE_INCR \
 123         (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE)
 124
 125 static void asic3_irq_flip_edge(struct asic3 *asic,
 126                                 u32 base, int bit)
 127 {
 128         u16 edge;
 129         unsigned long flags;
 130
 131         spin_lock_irqsave(&asic->lock, flags);
 132         edge = asic3_read_register(asic,
 133                                    base + ASIC3_GPIO_EDGE_TRIGGER);
 134         edge ^= bit;
 135         asic3_write_register(asic,
 136                              base + ASIC3_GPIO_EDGE_TRIGGER, edge);
 137         spin_unlock_irqrestore(&asic->lock, flags);
 138 }
 139
 140 static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc)
 141 {
 142         int iter, i;
 143         unsigned long flags;
 144         struct asic3 *asic;
 145
 146         desc->chip->ack(irq);
 147
 148         asic = desc->handler_data;
 149
 150         for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
 151                 u32 status;
 152                 int bank;
 153
 154                 spin_lock_irqsave(&asic->lock, flags);
 155                 status = asic3_read_register(asic,
 156                                              ASIC3_OFFSET(INTR, P_INT_STAT));
 157                 spin_unlock_irqrestore(&asic->lock, flags);
 158
 159                 /* Check all ten register bits */
 160                 if ((status & 0x3ff) == 0)
 161                         break;
 162
 163                 /* Handle GPIO IRQs */
 164                 for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) {
 165                         if (status & (1 << bank)) {
 166                                 unsigned long base, istat;
 167
 168                                 base = ASIC3_GPIO_A_BASE
 169                                        + bank * ASIC3_GPIO_BASE_INCR;
 170
 171                                 spin_lock_irqsave(&asic->lock, flags);
 172                                 istat = asic3_read_register(asic,
 173                                                             base +
 174                                                             ASIC3_GPIO_INT_STATUS);
 175                                 /* Clearing IntStatus */
 176                                 asic3_write_register(asic,
 177                                                      base +
 178                                                      ASIC3_GPIO_INT_STATUS, 0);
 179                                 spin_unlock_irqrestore(&asic->lock, flags);
 180
 181                                 for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
 182                                         int bit = (1 << i);
 183                                         unsigned int irqnr;
 184
 185                                         if (!(istat & bit))
 186                                                 continue;
 187
 188                                         irqnr = asic->irq_base +
 189                                                 (ASIC3_GPIOS_PER_BANK * bank)
 190                                                 + i;
 191                                         desc = irq_to_desc(irqnr);
 192                                         desc->handle_irq(irqnr, desc);
 193                                         if (asic->irq_bothedge[bank] & bit)
 194                                                 asic3_irq_flip_edge(asic, base,
 195                                                                     bit);
 196                                 }
 197                         }
 198                 }
 199
 200                 /* Handle remaining IRQs in the status register */
 201                 for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
 202                         /* They start at bit 4 and go up */
 203                         if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) {
 204                                 desc = irq_to_desc(asic->irq_base + i);
 205                                 desc->handle_irq(asic->irq_base + i,
 206                                                  desc);
 207                         }
 208                 }
 209         }
 210
 211         if (iter >= MAX_ASIC_ISR_LOOPS)
 212                 dev_err(asic->dev, "interrupt processing overrun\n");
 213 }
 214
 215 static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
 216 {
 217         int n;
 218
 219         n = (irq - asic->irq_base) >> 4;
 220
 221         return (n * (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE));
 222 }
 223
 224 static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
 225 {
 226         return (irq - asic->irq_base) & 0xf;
 227 }
 228
 229 static void asic3_mask_gpio_irq(unsigned int irq)
 230 {
 231         struct asic3 *asic = get_irq_chip_data(irq);
 232         u32 val, bank, index;
 233         unsigned long flags;
 234
 235         bank = asic3_irq_to_bank(asic, irq);
 236         index = asic3_irq_to_index(asic, irq);
 237
 238         spin_lock_irqsave(&asic->lock, flags);
 239         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 240         val |= 1 << index;
 241         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 242         spin_unlock_irqrestore(&asic->lock, flags);
 243 }
 244
 245 static void asic3_mask_irq(unsigned int irq)
 246 {
 247         struct asic3 *asic = get_irq_chip_data(irq);
 248         int regval;
 249         unsigned long flags;
 250
 251         spin_lock_irqsave(&asic->lock, flags);
 252         regval = asic3_read_register(asic,
 253                                      ASIC3_INTR_BASE +
 254                                      ASIC3_INTR_INT_MASK);
 255
 256         regval &= ~(ASIC3_INTMASK_MASK0 <<
 257                     (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 258
 259         asic3_write_register(asic,
 260                              ASIC3_INTR_BASE +
 261                              ASIC3_INTR_INT_MASK,
 262                              regval);
 263         spin_unlock_irqrestore(&asic->lock, flags);
 264 }
 265
 266 static void asic3_unmask_gpio_irq(unsigned int irq)
 267 {
 268         struct asic3 *asic = get_irq_chip_data(irq);
 269         u32 val, bank, index;
 270         unsigned long flags;
 271
 272         bank = asic3_irq_to_bank(asic, irq);
 273         index = asic3_irq_to_index(asic, irq);
 274
 275         spin_lock_irqsave(&asic->lock, flags);
 276         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 277         val &= ~(1 << index);
 278         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 279         spin_unlock_irqrestore(&asic->lock, flags);
 280 }
 281
 282 static void asic3_unmask_irq(unsigned int irq)
 283 {
 284         struct asic3 *asic = get_irq_chip_data(irq);
 285         int regval;
 286         unsigned long flags;
 287
 288         spin_lock_irqsave(&asic->lock, flags);
 289         regval = asic3_read_register(asic,
 290                                      ASIC3_INTR_BASE +
 291                                      ASIC3_INTR_INT_MASK);
 292
 293         regval |= (ASIC3_INTMASK_MASK0 <<
 294                    (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 295
 296         asic3_write_register(asic,
 297                              ASIC3_INTR_BASE +
 298                              ASIC3_INTR_INT_MASK,
 299                              regval);
 300         spin_unlock_irqrestore(&asic->lock, flags);
 301 }
 302
 303 static int asic3_gpio_irq_type(unsigned int irq, unsigned int type)
 304 {
 305         struct asic3 *asic = get_irq_chip_data(irq);
 306         u32 bank, index;
 307         u16 trigger, level, edge, bit;
 308         unsigned long flags;
 309
 310         bank = asic3_irq_to_bank(asic, irq);
 311         index = asic3_irq_to_index(asic, irq);
 312         bit = 1<<index;
 313
 314         spin_lock_irqsave(&asic->lock, flags);
 315         level = asic3_read_register(asic,
 316                                     bank + ASIC3_GPIO_LEVEL_TRIGGER);
 317         edge = asic3_read_register(asic,
 318                                    bank + ASIC3_GPIO_EDGE_TRIGGER);
 319         trigger = asic3_read_register(asic,
 320                                       bank + ASIC3_GPIO_TRIGGER_TYPE);
 321         asic->irq_bothedge[(irq - asic->irq_base) >> 4] &= ~bit;
 322
 323         if (type == IRQ_TYPE_EDGE_RISING) {
 324                 trigger |= bit;
 325                 edge |= bit;
 326         } else if (type == IRQ_TYPE_EDGE_FALLING) {
 327                 trigger |= bit;
 328                 edge &= ~bit;
 329         } else if (type == IRQ_TYPE_EDGE_BOTH) {
 330                 trigger |= bit;
 331                 if (asic3_gpio_get(&asic->gpio, irq - asic->irq_base))
 332                         edge &= ~bit;
 333                 else
 334                         edge |= bit;
 335                 asic->irq_bothedge[(irq - asic->irq_base) >> 4] |= bit;
 336         } else if (type == IRQ_TYPE_LEVEL_LOW) {
 337                 trigger &= ~bit;
 338                 level &= ~bit;
 339         } else if (type == IRQ_TYPE_LEVEL_HIGH) {
 340                 trigger &= ~bit;
 341                 level |= bit;
 342         } else {
 343                 /*
 344                  * if type == IRQ_TYPE_NONE, we should mask interrupts, but
 345                  * be careful to not unmask them if mask was also called.
 346                  * Probably need internal state for mask.
 347                  */
 348                 dev_notice(asic->dev, "irq type not changed\n");
 349         }
 350         asic3_write_register(asic, bank + ASIC3_GPIO_LEVEL_TRIGGER,
 351                              level);
 352         asic3_write_register(asic, bank + ASIC3_GPIO_EDGE_TRIGGER,
 353                              edge);
 354         asic3_write_register(asic, bank + ASIC3_GPIO_TRIGGER_TYPE,
 355                              trigger);
 356         spin_unlock_irqrestore(&asic->lock, flags);
 357         return 0;
 358 }
 359
 360 static struct irq_chip asic3_gpio_irq_chip = {
 361         .name           = "ASIC3-GPIO",
 362         .ack            = asic3_mask_gpio_irq,
 363         .mask           = asic3_mask_gpio_irq,
 364         .unmask         = asic3_unmask_gpio_irq,
 365         .set_type       = asic3_gpio_irq_type,
 366 };
 367
 368 static struct irq_chip asic3_irq_chip = {
 369         .name           = "ASIC3",
 370         .ack            = asic3_mask_irq,
 371         .mask           = asic3_mask_irq,
 372         .unmask         = asic3_unmask_irq,
 373 };
 374
 375 static int __init asic3_irq_probe(struct platform_device *pdev)
 376 {
 377         struct asic3 *asic = platform_get_drvdata(pdev);
 378         unsigned long clksel = 0;
 379         unsigned int irq, irq_base;
 380         int ret;
 381
 382         ret = platform_get_irq(pdev, 0);
 383         if (ret < 0)
 384                 return ret;
 385         asic->irq_nr = ret;
 386
 387         /* turn on clock to IRQ controller */
 388         clksel |= CLOCK_SEL_CX;
 389         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 390                              clksel);
 391
 392         irq_base = asic->irq_base;
 393
 394         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 395                 if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
 396                         set_irq_chip(irq, &asic3_gpio_irq_chip);
 397                 else
 398                         set_irq_chip(irq, &asic3_irq_chip);
 399
 400                 set_irq_chip_data(irq, asic);
 401                 set_irq_handler(irq, handle_level_irq);
 402                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 403         }
 404
 405         asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK),
 406                              ASIC3_INTMASK_GINTMASK);
 407
 408         set_irq_chained_handler(asic->irq_nr, asic3_irq_demux);
 409         set_irq_type(asic->irq_nr, IRQ_TYPE_EDGE_RISING);
 410         set_irq_data(asic->irq_nr, asic);
 411
 412         return 0;
 413 }
 414
 415 static void asic3_irq_remove(struct platform_device *pdev)
 416 {
 417         struct asic3 *asic = platform_get_drvdata(pdev);
 418         unsigned int irq, irq_base;
 419
 420         irq_base = asic->irq_base;
 421
 422         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 423                 set_irq_flags(irq, 0);
 424                 set_irq_handler(irq, NULL);
 425                 set_irq_chip(irq, NULL);
 426                 set_irq_chip_data(irq, NULL);
 427         }
 428         set_irq_chained_handler(asic->irq_nr, NULL);
 429 }
 430
 431 /* GPIOs */
 432 static int asic3_gpio_direction(struct gpio_chip *chip,
 433                                 unsigned offset, int out)
 434 {
 435         u32 mask = ASIC3_GPIO_TO_MASK(offset), out_reg;
 436         unsigned int gpio_base;
 437         unsigned long flags;
 438         struct asic3 *asic;
 439
 440         asic = container_of(chip, struct asic3, gpio);
 441         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 442
 443         if (gpio_base > ASIC3_GPIO_D_BASE) {
 444                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 445                         gpio_base, offset);
 446                 return -EINVAL;
 447         }
 448
 449         spin_lock_irqsave(&asic->lock, flags);
 450
 451         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_DIRECTION);
 452
 453         /* Input is 0, Output is 1 */
 454         if (out)
 455                 out_reg |= mask;
 456         else
 457                 out_reg &= ~mask;
 458
 459         asic3_write_register(asic, gpio_base + ASIC3_GPIO_DIRECTION, out_reg);
 460
 461         spin_unlock_irqrestore(&asic->lock, flags);
 462
 463         return 0;
 464
 465 }
 466
 467 static int asic3_gpio_direction_input(struct gpio_chip *chip,
 468                                       unsigned offset)
 469 {
 470         return asic3_gpio_direction(chip, offset, 0);
 471 }
 472
 473 static int asic3_gpio_direction_output(struct gpio_chip *chip,
 474                                        unsigned offset, int value)
 475 {
 476         return asic3_gpio_direction(chip, offset, 1);
 477 }
 478
 479 static int asic3_gpio_get(struct gpio_chip *chip,
 480                           unsigned offset)
 481 {
 482         unsigned int gpio_base;
 483         u32 mask = ASIC3_GPIO_TO_MASK(offset);
 484         struct asic3 *asic;
 485
 486         asic = container_of(chip, struct asic3, gpio);
 487         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 488
 489         if (gpio_base > ASIC3_GPIO_D_BASE) {
 490                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 491                         gpio_base, offset);
 492                 return -EINVAL;
 493         }
 494
 495         return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask;
 496 }
 497
 498 static void asic3_gpio_set(struct gpio_chip *chip,
 499                            unsigned offset, int value)
 500 {
 501         u32 mask, out_reg;
 502         unsigned int gpio_base;
 503         unsigned long flags;
 504         struct asic3 *asic;
 505
 506         asic = container_of(chip, struct asic3, gpio);
 507         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 508
 509         if (gpio_base > ASIC3_GPIO_D_BASE) {
 510                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 511                         gpio_base, offset);
 512                 return;
 513         }
 514
 515         mask = ASIC3_GPIO_TO_MASK(offset);
 516
 517         spin_lock_irqsave(&asic->lock, flags);
 518
 519         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_OUT);
 520
 521         if (value)
 522                 out_reg |= mask;
 523         else
 524                 out_reg &= ~mask;
 525
 526         asic3_write_register(asic, gpio_base + ASIC3_GPIO_OUT, out_reg);
 527
 528         spin_unlock_irqrestore(&asic->lock, flags);
 529
 530         return;
 531 }
 532
 533 static __init int asic3_gpio_probe(struct platform_device *pdev,
 534                                    u16 *gpio_config, int num)
 535 {
 536         struct asic3 *asic = platform_get_drvdata(pdev);
 537         u16 alt_reg[ASIC3_NUM_GPIO_BANKS];
 538         u16 out_reg[ASIC3_NUM_GPIO_BANKS];
 539         u16 dir_reg[ASIC3_NUM_GPIO_BANKS];
 540         int i;
 541
 542         memset(alt_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 543         memset(out_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 544         memset(dir_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 545
 546         /* Enable all GPIOs */
 547         asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, MASK), 0xffff);
 548         asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, MASK), 0xffff);
 549         asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, MASK), 0xffff);
 550         asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, MASK), 0xffff);
 551
 552         for (i = 0; i < num; i++) {
 553                 u8 alt, pin, dir, init, bank_num, bit_num;
 554                 u16 config = gpio_config[i];
 555
 556                 pin = ASIC3_CONFIG_GPIO_PIN(config);
 557                 alt = ASIC3_CONFIG_GPIO_ALT(config);
 558                 dir = ASIC3_CONFIG_GPIO_DIR(config);
 559                 init = ASIC3_CONFIG_GPIO_INIT(config);
 560
 561                 bank_num = ASIC3_GPIO_TO_BANK(pin);
 562                 bit_num = ASIC3_GPIO_TO_BIT(pin);
 563
 564                 alt_reg[bank_num] |= (alt << bit_num);
 565                 out_reg[bank_num] |= (init << bit_num);
 566                 dir_reg[bank_num] |= (dir << bit_num);
 567         }
 568
 569         for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) {
 570                 asic3_write_register(asic,
 571                                      ASIC3_BANK_TO_BASE(i) +
 572                                      ASIC3_GPIO_DIRECTION,
 573                                      dir_reg[i]);
 574                 asic3_write_register(asic,
 575                                      ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_OUT,
 576                                      out_reg[i]);
 577                 asic3_write_register(asic,
 578                                      ASIC3_BANK_TO_BASE(i) +
 579                                      ASIC3_GPIO_ALT_FUNCTION,
 580                                      alt_reg[i]);
 581         }
 582
 583         return gpiochip_add(&asic->gpio);
 584 }
 585
 586 static int asic3_gpio_remove(struct platform_device *pdev)
 587 {
 588         struct asic3 *asic = platform_get_drvdata(pdev);
 589
 590         return gpiochip_remove(&asic->gpio);
 591 }
 592
 593 static int asic3_clk_enable(struct asic3 *asic, struct asic3_clk *clk)
 594 {
 595         unsigned long flags;
 596         u32 cdex;
 597
 598         spin_lock_irqsave(&asic->lock, flags);
 599         if (clk->enabled++ == 0) {
 600                 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
 601                 cdex |= clk->cdex;
 602                 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
 603         }
 604         spin_unlock_irqrestore(&asic->lock, flags);
 605
 606         return 0;
 607 }
 608
 609 static void asic3_clk_disable(struct asic3 *asic, struct asic3_clk *clk)
 610 {
 611         unsigned long flags;
 612         u32 cdex;
 613
 614         WARN_ON(clk->enabled == 0);
 615
 616         spin_lock_irqsave(&asic->lock, flags);
 617         if (--clk->enabled == 0) {
 618                 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
 619                 cdex &= ~clk->cdex;
 620                 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
 621         }
 622         spin_unlock_irqrestore(&asic->lock, flags);
 623 }
 624
 625 /* MFD cells (SPI, PWM, LED, DS1WM, MMC) */
 626 static struct ds1wm_driver_data ds1wm_pdata = {
 627         .active_high = 1,
 628 };
 629
 630 static struct resource ds1wm_resources[] = {
 631         {
 632                 .start = ASIC3_OWM_BASE,
 633                 .end   = ASIC3_OWM_BASE + 0x13,
 634                 .flags = IORESOURCE_MEM,
 635         },
 636         {
 637                 .start = ASIC3_IRQ_OWM,
 638                 .start = ASIC3_IRQ_OWM,
 639                 .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
 640         },
 641 };
 642
 643 static int ds1wm_enable(struct platform_device *pdev)
 644 {
 645         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 646
 647         /* Turn on external clocks and the OWM clock */
 648         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 649         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 650         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
 651         msleep(1);
 652
 653         /* Reset and enable DS1WM */
 654         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
 655                            ASIC3_EXTCF_OWM_RESET, 1);
 656         msleep(1);
 657         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
 658                            ASIC3_EXTCF_OWM_RESET, 0);
 659         msleep(1);
 660         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 661                            ASIC3_EXTCF_OWM_EN, 1);
 662         msleep(1);
 663
 664         return 0;
 665 }
 666
 667 static int ds1wm_disable(struct platform_device *pdev)
 668 {
 669         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 670
 671         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 672                            ASIC3_EXTCF_OWM_EN, 0);
 673
 674         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
 675         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 676         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 677
 678         return 0;
 679 }
 680
 681 static struct mfd_cell asic3_cell_ds1wm = {
 682         .name          = "ds1wm",
 683         .enable        = ds1wm_enable,
 684         .disable       = ds1wm_disable,
 685         .driver_data   = &ds1wm_pdata,
 686         .num_resources = ARRAY_SIZE(ds1wm_resources),
 687         .resources     = ds1wm_resources,
 688 };
 689
 690 static void asic3_mmc_pwr(struct platform_device *pdev, int state)
 691 {
 692         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 693
 694         tmio_core_mmc_pwr(asic->tmio_cnf, 1 - asic->bus_shift, state);
 695 }
 696
 697 static void asic3_mmc_clk_div(struct platform_device *pdev, int state)
 698 {
 699         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 700
 701         tmio_core_mmc_clk_div(asic->tmio_cnf, 1 - asic->bus_shift, state);
 702 }
 703
 704 static struct tmio_mmc_data asic3_mmc_data = {
 705         .hclk           = 24576000,
 706         .set_pwr        = asic3_mmc_pwr,
 707         .set_clk_div    = asic3_mmc_clk_div,
 708 };
 709
 710 static struct resource asic3_mmc_resources[] = {
 711         {
 712                 .start = ASIC3_SD_CTRL_BASE,
 713                 .end   = ASIC3_SD_CTRL_BASE + 0x3ff,
 714                 .flags = IORESOURCE_MEM,
 715         },
 716         {
 717                 .start = 0,
 718                 .end   = 0,
 719                 .flags = IORESOURCE_IRQ,
 720         },
 721 };
 722
 723 static int asic3_mmc_enable(struct platform_device *pdev)
 724 {
 725         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 726
 727         /* Not sure if it must be done bit by bit, but leaving as-is */
 728         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 729                            ASIC3_SDHWCTRL_LEVCD, 1);
 730         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 731                            ASIC3_SDHWCTRL_LEVWP, 1);
 732         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 733                            ASIC3_SDHWCTRL_SUSPEND, 0);
 734         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 735                            ASIC3_SDHWCTRL_PCLR, 0);
 736
 737         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 738         /* CLK32 used for card detection and for interruption detection
 739          * when HCLK is stopped.
 740          */
 741         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 742         msleep(1);
 743
 744         /* HCLK 24.576 MHz, BCLK 12.288 MHz: */
 745         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 746                 CLOCK_SEL_CX | CLOCK_SEL_SD_HCLK_SEL);
 747
 748         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
 749         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
 750         msleep(1);
 751
 752         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 753                            ASIC3_EXTCF_SD_MEM_ENABLE, 1);
 754
 755         /* Enable SD card slot 3.3V power supply */
 756         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 757                            ASIC3_SDHWCTRL_SDPWR, 1);
 758
 759         /* ASIC3_SD_CTRL_BASE assumes 32-bit addressing, TMIO is 16-bit */
 760         tmio_core_mmc_enable(asic->tmio_cnf, 1 - asic->bus_shift,
 761                              ASIC3_SD_CTRL_BASE >> 1);
 762
 763         return 0;
 764 }
 765
 766 static int asic3_mmc_disable(struct platform_device *pdev)
 767 {
 768         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 769
 770         /* Put in suspend mode */
 771         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 772                            ASIC3_SDHWCTRL_SUSPEND, 1);
 773
 774         /* Disable clocks */
 775         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
 776         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
 777         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 778         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 779         return 0;
 780 }
 781
 782 static struct mfd_cell asic3_cell_mmc = {
 783         .name          = "tmio-mmc",
 784         .enable        = asic3_mmc_enable,
 785         .disable       = asic3_mmc_disable,
 786         .driver_data   = &asic3_mmc_data,
 787         .num_resources = ARRAY_SIZE(asic3_mmc_resources),
 788         .resources     = asic3_mmc_resources,
 789 };
 790
 791 static int __init asic3_mfd_probe(struct platform_device *pdev,
 792                                   struct resource *mem)
 793 {
 794         struct asic3 *asic = platform_get_drvdata(pdev);
 795         struct resource *mem_sdio;
 796         int irq, ret;
 797
 798         mem_sdio = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 799         if (!mem_sdio)
 800                 dev_dbg(asic->dev, "no SDIO MEM resource\n");
 801
 802         irq = platform_get_irq(pdev, 1);
 803         if (irq < 0)
 804                 dev_dbg(asic->dev, "no SDIO IRQ resource\n");
 805
 806         /* DS1WM */
 807         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 808                            ASIC3_EXTCF_OWM_SMB, 0);
 809
 810         ds1wm_resources[0].start >>= asic->bus_shift;
 811         ds1wm_resources[0].end   >>= asic->bus_shift;
 812
 813         asic3_cell_ds1wm.platform_data = &asic3_cell_ds1wm;
 814         asic3_cell_ds1wm.data_size = sizeof(asic3_cell_ds1wm);
 815
 816         /* MMC */
 817         asic->tmio_cnf = ioremap((ASIC3_SD_CONFIG_BASE >> asic->bus_shift) +
 818                                  mem_sdio->start, 0x400 >> asic->bus_shift);
 819         if (!asic->tmio_cnf) {
 820                 ret = -ENOMEM;
 821                 dev_dbg(asic->dev, "Couldn't ioremap SD_CONFIG\n");
 822                 goto out;
 823         }
 824         asic3_mmc_resources[0].start >>= asic->bus_shift;
 825         asic3_mmc_resources[0].end   >>= asic->bus_shift;
 826
 827         asic3_cell_mmc.platform_data = &asic3_cell_mmc;
 828         asic3_cell_mmc.data_size = sizeof(asic3_cell_mmc);
 829
 830         ret = mfd_add_devices(&pdev->dev, pdev->id,
 831                         &asic3_cell_ds1wm, 1, mem, asic->irq_base);
 832         if (ret < 0)
 833                 goto out;
 834
 835         if (mem_sdio && (irq >= 0))
 836                 ret = mfd_add_devices(&pdev->dev, pdev->id,
 837                         &asic3_cell_mmc, 1, mem_sdio, irq);
 838
 839  out:
 840         return ret;
 841 }
 842
 843 static void asic3_mfd_remove(struct platform_device *pdev)
 844 {
 845         struct asic3 *asic = platform_get_drvdata(pdev);
 846
 847         mfd_remove_devices(&pdev->dev);
 848         iounmap(asic->tmio_cnf);
 849 }
 850
 851 /* Core */
 852 static int __init asic3_probe(struct platform_device *pdev)
 853 {
 854         struct asic3_platform_data *pdata = pdev->dev.platform_data;
 855         struct asic3 *asic;
 856         struct resource *mem;
 857         unsigned long clksel;
 858         int ret = 0;
 859
 860         asic = kzalloc(sizeof(struct asic3), GFP_KERNEL);
 861         if (asic == NULL) {
 862                 printk(KERN_ERR "kzalloc failed\n");
 863                 return -ENOMEM;
 864         }
 865
 866         spin_lock_init(&asic->lock);
 867         platform_set_drvdata(pdev, asic);
 868         asic->dev = &pdev->dev;
 869
 870         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 871         if (!mem) {
 872                 ret = -ENOMEM;
 873                 dev_err(asic->dev, "no MEM resource\n");
 874                 goto out_free;
 875         }
 876
 877         asic->mapping = ioremap(mem->start, resource_size(mem));
 878         if (!asic->mapping) {
 879                 ret = -ENOMEM;
 880                 dev_err(asic->dev, "Couldn't ioremap\n");
 881                 goto out_free;
 882         }
 883
 884         asic->irq_base = pdata->irq_base;
 885
 886         /* calculate bus shift from mem resource */
 887         asic->bus_shift = 2 - (resource_size(mem) >> 12);
 888
 889         clksel = 0;
 890         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
 891
 892         ret = asic3_irq_probe(pdev);
 893         if (ret < 0) {
 894                 dev_err(asic->dev, "Couldn't probe IRQs\n");
 895                 goto out_unmap;
 896         }
 897
 898         asic->gpio.base = pdata->gpio_base;
 899         asic->gpio.ngpio = ASIC3_NUM_GPIOS;
 900         asic->gpio.get = asic3_gpio_get;
 901         asic->gpio.set = asic3_gpio_set;
 902         asic->gpio.direction_input = asic3_gpio_direction_input;
 903         asic->gpio.direction_output = asic3_gpio_direction_output;
 904
 905         ret = asic3_gpio_probe(pdev,
 906                                pdata->gpio_config,
 907                                pdata->gpio_config_num);
 908         if (ret < 0) {
 909                 dev_err(asic->dev, "GPIO probe failed\n");
 910                 goto out_irq;
 911         }
 912
 913         /* Making a per-device copy is only needed for the
 914          * theoretical case of multiple ASIC3s on one board:
 915          */
 916         memcpy(asic->clocks, asic3_clk_init, sizeof(asic3_clk_init));
 917
 918         asic3_mfd_probe(pdev, mem);
 919
 920         dev_info(asic->dev, "ASIC3 Core driver\n");
 921
 922         return 0;
 923
 924  out_irq:
 925         asic3_irq_remove(pdev);
 926
 927  out_unmap:
 928         iounmap(asic->mapping);
 929
 930  out_free:
 931         kfree(asic);
 932
 933         return ret;
 934 }
 935
 936 static int __devexit asic3_remove(struct platform_device *pdev)
 937 {
 938         int ret;
 939         struct asic3 *asic = platform_get_drvdata(pdev);
 940
 941         asic3_mfd_remove(pdev);
 942
 943         ret = asic3_gpio_remove(pdev);
 944         if (ret < 0)
 945                 return ret;
 946         asic3_irq_remove(pdev);
 947
 948         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);
 949
 950         iounmap(asic->mapping);
 951
 952         kfree(asic);
 953
 954         return 0;
 955 }
 956
 957 static void asic3_shutdown(struct platform_device *pdev)
 958 {
 959 }
 960
 961 static struct platform_driver asic3_device_driver = {
 962         .driver         = {
 963                 .name   = "asic3",
 964         },
 965         .remove         = __devexit_p(asic3_remove),
 966         .shutdown       = asic3_shutdown,
 967 };
 968
 969 static int __init asic3_init(void)
 970 {
 971         int retval = 0;
 972         retval = platform_driver_probe(&asic3_device_driver, asic3_probe);
 973         return retval;
 974 }
 975
 976 subsys_initcall(asic3_init);