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 <[email protected]>,
  15  *          Samuel Ortiz <[email protected]>
  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/export.h>
  24 #include <linux/io.h>
  25 #include <linux/slab.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/platform_device.h>
  28
  29 #include <linux/mfd/asic3.h>
  30 #include <linux/mfd/core.h>
  31 #include <linux/mfd/ds1wm.h>
  32 #include <linux/mfd/tmio.h>
  33
  34 enum {
  35         ASIC3_CLOCK_SPI,
  36         ASIC3_CLOCK_OWM,
  37         ASIC3_CLOCK_PWM0,
  38         ASIC3_CLOCK_PWM1,
  39         ASIC3_CLOCK_LED0,
  40         ASIC3_CLOCK_LED1,
  41         ASIC3_CLOCK_LED2,
  42         ASIC3_CLOCK_SD_HOST,
  43         ASIC3_CLOCK_SD_BUS,
  44         ASIC3_CLOCK_SMBUS,
  45         ASIC3_CLOCK_EX0,
  46         ASIC3_CLOCK_EX1,
  47 };
  48
  49 struct asic3_clk {
  50         int enabled;
  51         unsigned int cdex;
  52         unsigned long rate;
  53 };
  54
  55 #define INIT_CDEX(_name, _rate) \
  56         [ASIC3_CLOCK_##_name] = {               \
  57                 .cdex = CLOCK_CDEX_##_name,     \
  58                 .rate = _rate,                  \
  59         }
  60
  61 static struct asic3_clk asic3_clk_init[] __initdata = {
  62         INIT_CDEX(SPI, 0),
  63         INIT_CDEX(OWM, 5000000),
  64         INIT_CDEX(PWM0, 0),
  65         INIT_CDEX(PWM1, 0),
  66         INIT_CDEX(LED0, 0),
  67         INIT_CDEX(LED1, 0),
  68         INIT_CDEX(LED2, 0),
  69         INIT_CDEX(SD_HOST, 24576000),
  70         INIT_CDEX(SD_BUS, 12288000),
  71         INIT_CDEX(SMBUS, 0),
  72         INIT_CDEX(EX0, 32768),
  73         INIT_CDEX(EX1, 24576000),
  74 };
  75
  76 struct asic3 {
  77         void __iomem *mapping;
  78         unsigned int bus_shift;
  79         unsigned int irq_nr;
  80         unsigned int irq_base;
  81         raw_spinlock_t lock;
  82         u16 irq_bothedge[4];
  83         struct gpio_chip gpio;
  84         struct device *dev;
  85         void __iomem *tmio_cnf;
  86
  87         struct asic3_clk clocks[ARRAY_SIZE(asic3_clk_init)];
  88 };
  89
  90 static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);
  91
  92 void asic3_write_register(struct asic3 *asic, unsigned int reg, u32 value)
  93 {
  94         iowrite16(value, asic->mapping +
  95                   (reg >> asic->bus_shift));
  96 }
  97 EXPORT_SYMBOL_GPL(asic3_write_register);
  98
  99 u32 asic3_read_register(struct asic3 *asic, unsigned int reg)
 100 {
 101         return ioread16(asic->mapping +
 102                         (reg >> asic->bus_shift));
 103 }
 104 EXPORT_SYMBOL_GPL(asic3_read_register);
 105
 106 static void asic3_set_register(struct asic3 *asic, u32 reg, u32 bits, bool set)
 107 {
 108         unsigned long flags;
 109         u32 val;
 110
 111         raw_spin_lock_irqsave(&asic->lock, flags);
 112         val = asic3_read_register(asic, reg);
 113         if (set)
 114                 val |= bits;
 115         else
 116                 val &= ~bits;
 117         asic3_write_register(asic, reg, val);
 118         raw_spin_unlock_irqrestore(&asic->lock, flags);
 119 }
 120
 121 /* IRQs */
 122 #define MAX_ASIC_ISR_LOOPS    20
 123 #define ASIC3_GPIO_BASE_INCR \
 124         (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE)
 125
 126 static void asic3_irq_flip_edge(struct asic3 *asic,
 127                                 u32 base, int bit)
 128 {
 129         u16 edge;
 130         unsigned long flags;
 131
 132         raw_spin_lock_irqsave(&asic->lock, flags);
 133         edge = asic3_read_register(asic,
 134                                    base + ASIC3_GPIO_EDGE_TRIGGER);
 135         edge ^= bit;
 136         asic3_write_register(asic,
 137                              base + ASIC3_GPIO_EDGE_TRIGGER, edge);
 138         raw_spin_unlock_irqrestore(&asic->lock, flags);
 139 }
 140
 141 static void asic3_irq_demux(struct irq_desc *desc)
 142 {
 143         struct asic3 *asic = irq_desc_get_handler_data(desc);
 144         struct irq_data *data = irq_desc_get_irq_data(desc);
 145         int iter, i;
 146         unsigned long flags;
 147
 148         data->chip->irq_ack(data);
 149
 150         for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
 151                 u32 status;
 152                 int bank;
 153
 154                 raw_spin_lock_irqsave(&asic->lock, flags);
 155                 status = asic3_read_register(asic,
 156                                              ASIC3_OFFSET(INTR, P_INT_STAT));
 157                 raw_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                                 raw_spin_lock_irqsave(&asic->lock, flags);
 171                                 istat = asic3_read_register(asic,
 172                                                             base +
 173                                                             ASIC3_GPIO_INT_STATUS);
 174                                 /* Clearing IntStatus */
 175                                 asic3_write_register(asic,
 176                                                      base +
 177                                                      ASIC3_GPIO_INT_STATUS, 0);
 178                                 raw_spin_unlock_irqrestore(&asic->lock, flags);
 179
 180                                 for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
 181                                         int bit = (1 << i);
 182                                         unsigned int irqnr;
 183
 184                                         if (!(istat & bit))
 185                                                 continue;
 186
 187                                         irqnr = asic->irq_base +
 188                                                 (ASIC3_GPIOS_PER_BANK * bank)
 189                                                 + i;
 190                                         generic_handle_irq(irqnr);
 191                                         if (asic->irq_bothedge[bank] & bit)
 192                                                 asic3_irq_flip_edge(asic, base,
 193                                                                     bit);
 194                                 }
 195                         }
 196                 }
 197
 198                 /* Handle remaining IRQs in the status register */
 199                 for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
 200                         /* They start at bit 4 and go up */
 201                         if (status & (1 << (i - ASIC3_NUM_GPIOS + 4)))
 202                                 generic_handle_irq(asic->irq_base + i);
 203                 }
 204         }
 205
 206         if (iter >= MAX_ASIC_ISR_LOOPS)
 207                 dev_err(asic->dev, "interrupt processing overrun\n");
 208 }
 209
 210 static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
 211 {
 212         int n;
 213
 214         n = (irq - asic->irq_base) >> 4;
 215
 216         return (n * (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE));
 217 }
 218
 219 static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
 220 {
 221         return (irq - asic->irq_base) & 0xf;
 222 }
 223
 224 static void asic3_mask_gpio_irq(struct irq_data *data)
 225 {
 226         struct asic3 *asic = irq_data_get_irq_chip_data(data);
 227         u32 val, bank, index;
 228         unsigned long flags;
 229
 230         bank = asic3_irq_to_bank(asic, data->irq);
 231         index = asic3_irq_to_index(asic, data->irq);
 232
 233         raw_spin_lock_irqsave(&asic->lock, flags);
 234         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 235         val |= 1 << index;
 236         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 237         raw_spin_unlock_irqrestore(&asic->lock, flags);
 238 }
 239
 240 static void asic3_mask_irq(struct irq_data *data)
 241 {
 242         struct asic3 *asic = irq_data_get_irq_chip_data(data);
 243         int regval;
 244         unsigned long flags;
 245
 246         raw_spin_lock_irqsave(&asic->lock, flags);
 247         regval = asic3_read_register(asic,
 248                                      ASIC3_INTR_BASE +
 249                                      ASIC3_INTR_INT_MASK);
 250
 251         regval &= ~(ASIC3_INTMASK_MASK0 <<
 252                     (data->irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 253
 254         asic3_write_register(asic,
 255                              ASIC3_INTR_BASE +
 256                              ASIC3_INTR_INT_MASK,
 257                              regval);
 258         raw_spin_unlock_irqrestore(&asic->lock, flags);
 259 }
 260
 261 static void asic3_unmask_gpio_irq(struct irq_data *data)
 262 {
 263         struct asic3 *asic = irq_data_get_irq_chip_data(data);
 264         u32 val, bank, index;
 265         unsigned long flags;
 266
 267         bank = asic3_irq_to_bank(asic, data->irq);
 268         index = asic3_irq_to_index(asic, data->irq);
 269
 270         raw_spin_lock_irqsave(&asic->lock, flags);
 271         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 272         val &= ~(1 << index);
 273         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 274         raw_spin_unlock_irqrestore(&asic->lock, flags);
 275 }
 276
 277 static void asic3_unmask_irq(struct irq_data *data)
 278 {
 279         struct asic3 *asic = irq_data_get_irq_chip_data(data);
 280         int regval;
 281         unsigned long flags;
 282
 283         raw_spin_lock_irqsave(&asic->lock, flags);
 284         regval = asic3_read_register(asic,
 285                                      ASIC3_INTR_BASE +
 286                                      ASIC3_INTR_INT_MASK);
 287
 288         regval |= (ASIC3_INTMASK_MASK0 <<
 289                    (data->irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 290
 291         asic3_write_register(asic,
 292                              ASIC3_INTR_BASE +
 293                              ASIC3_INTR_INT_MASK,
 294                              regval);
 295         raw_spin_unlock_irqrestore(&asic->lock, flags);
 296 }
 297
 298 static int asic3_gpio_irq_type(struct irq_data *data, unsigned int type)
 299 {
 300         struct asic3 *asic = irq_data_get_irq_chip_data(data);
 301         u32 bank, index;
 302         u16 trigger, level, edge, bit;
 303         unsigned long flags;
 304
 305         bank = asic3_irq_to_bank(asic, data->irq);
 306         index = asic3_irq_to_index(asic, data->irq);
 307         bit = 1<<index;
 308
 309         raw_spin_lock_irqsave(&asic->lock, flags);
 310         level = asic3_read_register(asic,
 311                                     bank + ASIC3_GPIO_LEVEL_TRIGGER);
 312         edge = asic3_read_register(asic,
 313                                    bank + ASIC3_GPIO_EDGE_TRIGGER);
 314         trigger = asic3_read_register(asic,
 315                                       bank + ASIC3_GPIO_TRIGGER_TYPE);
 316         asic->irq_bothedge[(data->irq - asic->irq_base) >> 4] &= ~bit;
 317
 318         if (type == IRQ_TYPE_EDGE_RISING) {
 319                 trigger |= bit;
 320                 edge |= bit;
 321         } else if (type == IRQ_TYPE_EDGE_FALLING) {
 322                 trigger |= bit;
 323                 edge &= ~bit;
 324         } else if (type == IRQ_TYPE_EDGE_BOTH) {
 325                 trigger |= bit;
 326                 if (asic3_gpio_get(&asic->gpio, data->irq - asic->irq_base))
 327                         edge &= ~bit;
 328                 else
 329                         edge |= bit;
 330                 asic->irq_bothedge[(data->irq - asic->irq_base) >> 4] |= bit;
 331         } else if (type == IRQ_TYPE_LEVEL_LOW) {
 332                 trigger &= ~bit;
 333                 level &= ~bit;
 334         } else if (type == IRQ_TYPE_LEVEL_HIGH) {
 335                 trigger &= ~bit;
 336                 level |= bit;
 337         } else {
 338                 /*
 339                  * if type == IRQ_TYPE_NONE, we should mask interrupts, but
 340                  * be careful to not unmask them if mask was also called.
 341                  * Probably need internal state for mask.
 342                  */
 343                 dev_notice(asic->dev, "irq type not changed\n");
 344         }
 345         asic3_write_register(asic, bank + ASIC3_GPIO_LEVEL_TRIGGER,
 346                              level);
 347         asic3_write_register(asic, bank + ASIC3_GPIO_EDGE_TRIGGER,
 348                              edge);
 349         asic3_write_register(asic, bank + ASIC3_GPIO_TRIGGER_TYPE,
 350                              trigger);
 351         raw_spin_unlock_irqrestore(&asic->lock, flags);
 352         return 0;
 353 }
 354
 355 static int asic3_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
 356 {
 357         struct asic3 *asic = irq_data_get_irq_chip_data(data);
 358         u32 bank, index;
 359         u16 bit;
 360
 361         bank = asic3_irq_to_bank(asic, data->irq);
 362         index = asic3_irq_to_index(asic, data->irq);
 363         bit = 1<<index;
 364
 365         asic3_set_register(asic, bank + ASIC3_GPIO_SLEEP_MASK, bit, !on);
 366
 367         return 0;
 368 }
 369
 370 static struct irq_chip asic3_gpio_irq_chip = {
 371         .name           = "ASIC3-GPIO",
 372         .irq_ack        = asic3_mask_gpio_irq,
 373         .irq_mask       = asic3_mask_gpio_irq,
 374         .irq_unmask     = asic3_unmask_gpio_irq,
 375         .irq_set_type   = asic3_gpio_irq_type,
 376         .irq_set_wake   = asic3_gpio_irq_set_wake,
 377 };
 378
 379 static struct irq_chip asic3_irq_chip = {
 380         .name           = "ASIC3",
 381         .irq_ack        = asic3_mask_irq,
 382         .irq_mask       = asic3_mask_irq,
 383         .irq_unmask     = asic3_unmask_irq,
 384 };
 385
 386 static int __init asic3_irq_probe(struct platform_device *pdev)
 387 {
 388         struct asic3 *asic = platform_get_drvdata(pdev);
 389         unsigned long clksel = 0;
 390         unsigned int irq, irq_base;
 391         int ret;
 392
 393         ret = platform_get_irq(pdev, 0);
 394         if (ret < 0)
 395                 return ret;
 396         asic->irq_nr = ret;
 397
 398         /* turn on clock to IRQ controller */
 399         clksel |= CLOCK_SEL_CX;
 400         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 401                              clksel);
 402
 403         irq_base = asic->irq_base;
 404
 405         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 406                 if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
 407                         irq_set_chip(irq, &asic3_gpio_irq_chip);
 408                 else
 409                         irq_set_chip(irq, &asic3_irq_chip);
 410
 411                 irq_set_chip_data(irq, asic);
 412                 irq_set_handler(irq, handle_level_irq);
 413                 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
 414         }
 415
 416         asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK),
 417                              ASIC3_INTMASK_GINTMASK);
 418
 419         irq_set_chained_handler_and_data(asic->irq_nr, asic3_irq_demux, asic);
 420         irq_set_irq_type(asic->irq_nr, IRQ_TYPE_EDGE_RISING);
 421
 422         return 0;
 423 }
 424
 425 static void asic3_irq_remove(struct platform_device *pdev)
 426 {
 427         struct asic3 *asic = platform_get_drvdata(pdev);
 428         unsigned int irq, irq_base;
 429
 430         irq_base = asic->irq_base;
 431
 432         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 433                 irq_set_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
 434                 irq_set_chip_and_handler(irq, NULL, NULL);
 435                 irq_set_chip_data(irq, NULL);
 436         }
 437         irq_set_chained_handler(asic->irq_nr, NULL);
 438 }
 439
 440 /* GPIOs */
 441 static int asic3_gpio_direction(struct gpio_chip *chip,
 442                                 unsigned offset, int out)
 443 {
 444         u32 mask = ASIC3_GPIO_TO_MASK(offset), out_reg;
 445         unsigned int gpio_base;
 446         unsigned long flags;
 447         struct asic3 *asic;
 448
 449         asic = gpiochip_get_data(chip);
 450         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 451
 452         if (gpio_base > ASIC3_GPIO_D_BASE) {
 453                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 454                         gpio_base, offset);
 455                 return -EINVAL;
 456         }
 457
 458         raw_spin_lock_irqsave(&asic->lock, flags);
 459
 460         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_DIRECTION);
 461
 462         /* Input is 0, Output is 1 */
 463         if (out)
 464                 out_reg |= mask;
 465         else
 466                 out_reg &= ~mask;
 467
 468         asic3_write_register(asic, gpio_base + ASIC3_GPIO_DIRECTION, out_reg);
 469
 470         raw_spin_unlock_irqrestore(&asic->lock, flags);
 471
 472         return 0;
 473
 474 }
 475
 476 static int asic3_gpio_direction_input(struct gpio_chip *chip,
 477                                       unsigned offset)
 478 {
 479         return asic3_gpio_direction(chip, offset, 0);
 480 }
 481
 482 static int asic3_gpio_direction_output(struct gpio_chip *chip,
 483                                        unsigned offset, int value)
 484 {
 485         return asic3_gpio_direction(chip, offset, 1);
 486 }
 487
 488 static int asic3_gpio_get(struct gpio_chip *chip,
 489                           unsigned offset)
 490 {
 491         unsigned int gpio_base;
 492         u32 mask = ASIC3_GPIO_TO_MASK(offset);
 493         struct asic3 *asic;
 494
 495         asic = gpiochip_get_data(chip);
 496         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 497
 498         if (gpio_base > ASIC3_GPIO_D_BASE) {
 499                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 500                         gpio_base, offset);
 501                 return -EINVAL;
 502         }
 503
 504         return !!(asic3_read_register(asic,
 505                                       gpio_base + ASIC3_GPIO_STATUS) & mask);
 506 }
 507
 508 static void asic3_gpio_set(struct gpio_chip *chip,
 509                            unsigned offset, int value)
 510 {
 511         u32 mask, out_reg;
 512         unsigned int gpio_base;
 513         unsigned long flags;
 514         struct asic3 *asic;
 515
 516         asic = gpiochip_get_data(chip);
 517         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 518
 519         if (gpio_base > ASIC3_GPIO_D_BASE) {
 520                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 521                         gpio_base, offset);
 522                 return;
 523         }
 524
 525         mask = ASIC3_GPIO_TO_MASK(offset);
 526
 527         raw_spin_lock_irqsave(&asic->lock, flags);
 528
 529         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_OUT);
 530
 531         if (value)
 532                 out_reg |= mask;
 533         else
 534                 out_reg &= ~mask;
 535
 536         asic3_write_register(asic, gpio_base + ASIC3_GPIO_OUT, out_reg);
 537
 538         raw_spin_unlock_irqrestore(&asic->lock, flags);
 539 }
 540
 541 static int asic3_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 542 {
 543         struct asic3 *asic = gpiochip_get_data(chip);
 544
 545         return asic->irq_base + offset;
 546 }
 547
 548 static __init int asic3_gpio_probe(struct platform_device *pdev,
 549                                    u16 *gpio_config, int num)
 550 {
 551         struct asic3 *asic = platform_get_drvdata(pdev);
 552         u16 alt_reg[ASIC3_NUM_GPIO_BANKS];
 553         u16 out_reg[ASIC3_NUM_GPIO_BANKS];
 554         u16 dir_reg[ASIC3_NUM_GPIO_BANKS];
 555         int i;
 556
 557         memset(alt_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 558         memset(out_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 559         memset(dir_reg, 0, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 560
 561         /* Enable all GPIOs */
 562         asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, MASK), 0xffff);
 563         asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, MASK), 0xffff);
 564         asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, MASK), 0xffff);
 565         asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, MASK), 0xffff);
 566
 567         for (i = 0; i < num; i++) {
 568                 u8 alt, pin, dir, init, bank_num, bit_num;
 569                 u16 config = gpio_config[i];
 570
 571                 pin = ASIC3_CONFIG_GPIO_PIN(config);
 572                 alt = ASIC3_CONFIG_GPIO_ALT(config);
 573                 dir = ASIC3_CONFIG_GPIO_DIR(config);
 574                 init = ASIC3_CONFIG_GPIO_INIT(config);
 575
 576                 bank_num = ASIC3_GPIO_TO_BANK(pin);
 577                 bit_num = ASIC3_GPIO_TO_BIT(pin);
 578
 579                 alt_reg[bank_num] |= (alt << bit_num);
 580                 out_reg[bank_num] |= (init << bit_num);
 581                 dir_reg[bank_num] |= (dir << bit_num);
 582         }
 583
 584         for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) {
 585                 asic3_write_register(asic,
 586                                      ASIC3_BANK_TO_BASE(i) +
 587                                      ASIC3_GPIO_DIRECTION,
 588                                      dir_reg[i]);
 589                 asic3_write_register(asic,
 590                                      ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_OUT,
 591                                      out_reg[i]);
 592                 asic3_write_register(asic,
 593                                      ASIC3_BANK_TO_BASE(i) +
 594                                      ASIC3_GPIO_ALT_FUNCTION,
 595                                      alt_reg[i]);
 596         }
 597
 598         return gpiochip_add_data(&asic->gpio, asic);
 599 }
 600
 601 static int asic3_gpio_remove(struct platform_device *pdev)
 602 {
 603         struct asic3 *asic = platform_get_drvdata(pdev);
 604
 605         gpiochip_remove(&asic->gpio);
 606         return 0;
 607 }
 608
 609 static void asic3_clk_enable(struct asic3 *asic, struct asic3_clk *clk)
 610 {
 611         unsigned long flags;
 612         u32 cdex;
 613
 614         raw_spin_lock_irqsave(&asic->lock, flags);
 615         if (clk->enabled++ == 0) {
 616                 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
 617                 cdex |= clk->cdex;
 618                 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
 619         }
 620         raw_spin_unlock_irqrestore(&asic->lock, flags);
 621 }
 622
 623 static void asic3_clk_disable(struct asic3 *asic, struct asic3_clk *clk)
 624 {
 625         unsigned long flags;
 626         u32 cdex;
 627
 628         WARN_ON(clk->enabled == 0);
 629
 630         raw_spin_lock_irqsave(&asic->lock, flags);
 631         if (--clk->enabled == 0) {
 632                 cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
 633                 cdex &= ~clk->cdex;
 634                 asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
 635         }
 636         raw_spin_unlock_irqrestore(&asic->lock, flags);
 637 }
 638
 639 /* MFD cells (SPI, PWM, LED, DS1WM, MMC) */
 640 static struct ds1wm_driver_data ds1wm_pdata = {
 641         .active_high = 1,
 642         .reset_recover_delay = 1,
 643 };
 644
 645 static struct resource ds1wm_resources[] = {
 646         {
 647                 .start = ASIC3_OWM_BASE,
 648                 .end   = ASIC3_OWM_BASE + 0x13,
 649                 .flags = IORESOURCE_MEM,
 650         },
 651         {
 652                 .start = ASIC3_IRQ_OWM,
 653                 .end   = ASIC3_IRQ_OWM,
 654                 .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
 655         },
 656 };
 657
 658 static int ds1wm_enable(struct platform_device *pdev)
 659 {
 660         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 661
 662         /* Turn on external clocks and the OWM clock */
 663         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 664         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 665         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
 666         usleep_range(1000, 5000);
 667
 668         /* Reset and enable DS1WM */
 669         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
 670                            ASIC3_EXTCF_OWM_RESET, 1);
 671         usleep_range(1000, 5000);
 672         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, RESET),
 673                            ASIC3_EXTCF_OWM_RESET, 0);
 674         usleep_range(1000, 5000);
 675         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 676                            ASIC3_EXTCF_OWM_EN, 1);
 677         usleep_range(1000, 5000);
 678
 679         return 0;
 680 }
 681
 682 static int ds1wm_disable(struct platform_device *pdev)
 683 {
 684         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 685
 686         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 687                            ASIC3_EXTCF_OWM_EN, 0);
 688
 689         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_OWM]);
 690         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 691         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 692
 693         return 0;
 694 }
 695
 696 static const struct mfd_cell asic3_cell_ds1wm = {
 697         .name          = "ds1wm",
 698         .enable        = ds1wm_enable,
 699         .disable       = ds1wm_disable,
 700         .platform_data = &ds1wm_pdata,
 701         .pdata_size    = sizeof(ds1wm_pdata),
 702         .num_resources = ARRAY_SIZE(ds1wm_resources),
 703         .resources     = ds1wm_resources,
 704 };
 705
 706 static void asic3_mmc_pwr(struct platform_device *pdev, int state)
 707 {
 708         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 709
 710         tmio_core_mmc_pwr(asic->tmio_cnf, 1 - asic->bus_shift, state);
 711 }
 712
 713 static void asic3_mmc_clk_div(struct platform_device *pdev, int state)
 714 {
 715         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 716
 717         tmio_core_mmc_clk_div(asic->tmio_cnf, 1 - asic->bus_shift, state);
 718 }
 719
 720 static struct tmio_mmc_data asic3_mmc_data = {
 721         .hclk           = 24576000,
 722         .set_pwr        = asic3_mmc_pwr,
 723         .set_clk_div    = asic3_mmc_clk_div,
 724 };
 725
 726 static struct resource asic3_mmc_resources[] = {
 727         {
 728                 .start = ASIC3_SD_CTRL_BASE,
 729                 .end   = ASIC3_SD_CTRL_BASE + 0x3ff,
 730                 .flags = IORESOURCE_MEM,
 731         },
 732         {
 733                 .start = 0,
 734                 .end   = 0,
 735                 .flags = IORESOURCE_IRQ,
 736         },
 737 };
 738
 739 static int asic3_mmc_enable(struct platform_device *pdev)
 740 {
 741         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 742
 743         /* Not sure if it must be done bit by bit, but leaving as-is */
 744         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 745                            ASIC3_SDHWCTRL_LEVCD, 1);
 746         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 747                            ASIC3_SDHWCTRL_LEVWP, 1);
 748         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 749                            ASIC3_SDHWCTRL_SUSPEND, 0);
 750         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 751                            ASIC3_SDHWCTRL_PCLR, 0);
 752
 753         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 754         /* CLK32 used for card detection and for interruption detection
 755          * when HCLK is stopped.
 756          */
 757         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 758         usleep_range(1000, 5000);
 759
 760         /* HCLK 24.576 MHz, BCLK 12.288 MHz: */
 761         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 762                 CLOCK_SEL_CX | CLOCK_SEL_SD_HCLK_SEL);
 763
 764         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
 765         asic3_clk_enable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
 766         usleep_range(1000, 5000);
 767
 768         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 769                            ASIC3_EXTCF_SD_MEM_ENABLE, 1);
 770
 771         /* Enable SD card slot 3.3V power supply */
 772         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 773                            ASIC3_SDHWCTRL_SDPWR, 1);
 774
 775         /* ASIC3_SD_CTRL_BASE assumes 32-bit addressing, TMIO is 16-bit */
 776         tmio_core_mmc_enable(asic->tmio_cnf, 1 - asic->bus_shift,
 777                              ASIC3_SD_CTRL_BASE >> 1);
 778
 779         return 0;
 780 }
 781
 782 static int asic3_mmc_disable(struct platform_device *pdev)
 783 {
 784         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 785
 786         /* Put in suspend mode */
 787         asic3_set_register(asic, ASIC3_OFFSET(SDHWCTRL, SDCONF),
 788                            ASIC3_SDHWCTRL_SUSPEND, 1);
 789
 790         /* Disable clocks */
 791         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_HOST]);
 792         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_SD_BUS]);
 793         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX0]);
 794         asic3_clk_disable(asic, &asic->clocks[ASIC3_CLOCK_EX1]);
 795         return 0;
 796 }
 797
 798 static const struct mfd_cell asic3_cell_mmc = {
 799         .name          = "tmio-mmc",
 800         .enable        = asic3_mmc_enable,
 801         .disable       = asic3_mmc_disable,
 802         .suspend       = asic3_mmc_disable,
 803         .resume        = asic3_mmc_enable,
 804         .platform_data = &asic3_mmc_data,
 805         .pdata_size    = sizeof(asic3_mmc_data),
 806         .num_resources = ARRAY_SIZE(asic3_mmc_resources),
 807         .resources     = asic3_mmc_resources,
 808 };
 809
 810 static const int clock_ledn[ASIC3_NUM_LEDS] = {
 811         [0] = ASIC3_CLOCK_LED0,
 812         [1] = ASIC3_CLOCK_LED1,
 813         [2] = ASIC3_CLOCK_LED2,
 814 };
 815
 816 static int asic3_leds_enable(struct platform_device *pdev)
 817 {
 818         const struct mfd_cell *cell = mfd_get_cell(pdev);
 819         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 820
 821         asic3_clk_enable(asic, &asic->clocks[clock_ledn[cell->id]]);
 822
 823         return 0;
 824 }
 825
 826 static int asic3_leds_disable(struct platform_device *pdev)
 827 {
 828         const struct mfd_cell *cell = mfd_get_cell(pdev);
 829         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 830
 831         asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
 832
 833         return 0;
 834 }
 835
 836 static int asic3_leds_suspend(struct platform_device *pdev)
 837 {
 838         const struct mfd_cell *cell = mfd_get_cell(pdev);
 839         struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
 840
 841         while (asic3_gpio_get(&asic->gpio, ASIC3_GPIO(C, cell->id)) != 0)
 842                 usleep_range(1000, 5000);
 843
 844         asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
 845
 846         return 0;
 847 }
 848
 849 static struct mfd_cell asic3_cell_leds[ASIC3_NUM_LEDS] = {
 850         [0] = {
 851                 .name          = "leds-asic3",
 852                 .id            = 0,
 853                 .enable        = asic3_leds_enable,
 854                 .disable       = asic3_leds_disable,
 855                 .suspend       = asic3_leds_suspend,
 856                 .resume        = asic3_leds_enable,
 857         },
 858         [1] = {
 859                 .name          = "leds-asic3",
 860                 .id            = 1,
 861                 .enable        = asic3_leds_enable,
 862                 .disable       = asic3_leds_disable,
 863                 .suspend       = asic3_leds_suspend,
 864                 .resume        = asic3_leds_enable,
 865         },
 866         [2] = {
 867                 .name          = "leds-asic3",
 868                 .id            = 2,
 869                 .enable        = asic3_leds_enable,
 870                 .disable       = asic3_leds_disable,
 871                 .suspend       = asic3_leds_suspend,
 872                 .resume        = asic3_leds_enable,
 873         },
 874 };
 875
 876 static int __init asic3_mfd_probe(struct platform_device *pdev,
 877                                   struct asic3_platform_data *pdata,
 878                                   struct resource *mem)
 879 {
 880         struct asic3 *asic = platform_get_drvdata(pdev);
 881         struct resource *mem_sdio;
 882         int irq, ret;
 883
 884         mem_sdio = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 885         if (!mem_sdio)
 886                 dev_dbg(asic->dev, "no SDIO MEM resource\n");
 887
 888         irq = platform_get_irq(pdev, 1);
 889         if (irq < 0)
 890                 dev_dbg(asic->dev, "no SDIO IRQ resource\n");
 891
 892         /* DS1WM */
 893         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
 894                            ASIC3_EXTCF_OWM_SMB, 0);
 895
 896         ds1wm_resources[0].start >>= asic->bus_shift;
 897         ds1wm_resources[0].end   >>= asic->bus_shift;
 898
 899         /* MMC */
 900         if (mem_sdio) {
 901                 asic->tmio_cnf = ioremap((ASIC3_SD_CONFIG_BASE >>
 902                                           asic->bus_shift) + mem_sdio->start,
 903                                  ASIC3_SD_CONFIG_SIZE >> asic->bus_shift);
 904                 if (!asic->tmio_cnf) {
 905                         ret = -ENOMEM;
 906                         dev_dbg(asic->dev, "Couldn't ioremap SD_CONFIG\n");
 907                         goto out;
 908                 }
 909         }
 910         asic3_mmc_resources[0].start >>= asic->bus_shift;
 911         asic3_mmc_resources[0].end   >>= asic->bus_shift;
 912
 913         if (pdata->clock_rate) {
 914                 ds1wm_pdata.clock_rate = pdata->clock_rate;
 915                 ret = mfd_add_devices(&pdev->dev, pdev->id,
 916                         &asic3_cell_ds1wm, 1, mem, asic->irq_base, NULL);
 917                 if (ret < 0)
 918                         goto out;
 919         }
 920
 921         if (mem_sdio && (irq >= 0)) {
 922                 ret = mfd_add_devices(&pdev->dev, pdev->id,
 923                         &asic3_cell_mmc, 1, mem_sdio, irq, NULL);
 924                 if (ret < 0)
 925                         goto out;
 926         }
 927
 928         ret = 0;
 929         if (pdata->leds) {
 930                 int i;
 931
 932                 for (i = 0; i < ASIC3_NUM_LEDS; ++i) {
 933                         asic3_cell_leds[i].platform_data = &pdata->leds[i];
 934                         asic3_cell_leds[i].pdata_size = sizeof(pdata->leds[i]);
 935                 }
 936                 ret = mfd_add_devices(&pdev->dev, 0,
 937                         asic3_cell_leds, ASIC3_NUM_LEDS, NULL, 0, NULL);
 938         }
 939
 940  out:
 941         return ret;
 942 }
 943
 944 static void asic3_mfd_remove(struct platform_device *pdev)
 945 {
 946         struct asic3 *asic = platform_get_drvdata(pdev);
 947
 948         mfd_remove_devices(&pdev->dev);
 949         iounmap(asic->tmio_cnf);
 950 }
 951
 952 /* Core */
 953 static int __init asic3_probe(struct platform_device *pdev)
 954 {
 955         struct asic3_platform_data *pdata = dev_get_platdata(&pdev->dev);
 956         struct asic3 *asic;
 957         struct resource *mem;
 958         unsigned long clksel;
 959         int ret = 0;
 960
 961         asic = devm_kzalloc(&pdev->dev,
 962                             sizeof(struct asic3), GFP_KERNEL);
 963         if (!asic)
 964                 return -ENOMEM;
 965
 966         raw_spin_lock_init(&asic->lock);
 967         platform_set_drvdata(pdev, asic);
 968         asic->dev = &pdev->dev;
 969
 970         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 971         if (!mem) {
 972                 dev_err(asic->dev, "no MEM resource\n");
 973                 return -ENOMEM;
 974         }
 975
 976         asic->mapping = ioremap(mem->start, resource_size(mem));
 977         if (!asic->mapping) {
 978                 dev_err(asic->dev, "Couldn't ioremap\n");
 979                 return -ENOMEM;
 980         }
 981
 982         asic->irq_base = pdata->irq_base;
 983
 984         /* calculate bus shift from mem resource */
 985         asic->bus_shift = 2 - (resource_size(mem) >> 12);
 986
 987         clksel = 0;
 988         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
 989
 990         ret = asic3_irq_probe(pdev);
 991         if (ret < 0) {
 992                 dev_err(asic->dev, "Couldn't probe IRQs\n");
 993                 goto out_unmap;
 994         }
 995
 996         asic->gpio.label = "asic3";
 997         asic->gpio.base = pdata->gpio_base;
 998         asic->gpio.ngpio = ASIC3_NUM_GPIOS;
 999         asic->gpio.get = asic3_gpio_get;
1000         asic->gpio.set = asic3_gpio_set;
1001         asic->gpio.direction_input = asic3_gpio_direction_input;
1002         asic->gpio.direction_output = asic3_gpio_direction_output;
1003         asic->gpio.to_irq = asic3_gpio_to_irq;
1004
1005         ret = asic3_gpio_probe(pdev,
1006                                pdata->gpio_config,
1007                                pdata->gpio_config_num);
1008         if (ret < 0) {
1009                 dev_err(asic->dev, "GPIO probe failed\n");
1010                 goto out_irq;
1011         }
1012
1013         /* Making a per-device copy is only needed for the
1014          * theoretical case of multiple ASIC3s on one board:
1015          */
1016         memcpy(asic->clocks, asic3_clk_init, sizeof(asic3_clk_init));
1017
1018         asic3_mfd_probe(pdev, pdata, mem);
1019
1020         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
1021                 (ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 1);
1022
1023         dev_info(asic->dev, "ASIC3 Core driver\n");
1024
1025         return 0;
1026
1027  out_irq:
1028         asic3_irq_remove(pdev);
1029
1030  out_unmap:
1031         iounmap(asic->mapping);
1032
1033         return ret;
1034 }
1035
1036 static int asic3_remove(struct platform_device *pdev)
1037 {
1038         int ret;
1039         struct asic3 *asic = platform_get_drvdata(pdev);
1040
1041         asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
1042                 (ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 0);
1043
1044         asic3_mfd_remove(pdev);
1045
1046         ret = asic3_gpio_remove(pdev);
1047         if (ret < 0)
1048                 return ret;
1049         asic3_irq_remove(pdev);
1050
1051         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);
1052
1053         iounmap(asic->mapping);
1054
1055         return 0;
1056 }
1057
1058 static void asic3_shutdown(struct platform_device *pdev)
1059 {
1060 }
1061
1062 static struct platform_driver asic3_device_driver = {
1063         .driver         = {
1064                 .name   = "asic3",
1065         },
1066         .remove         = asic3_remove,
1067         .shutdown       = asic3_shutdown,
1068 };
1069
1070 static int __init asic3_init(void)
1071 {
1072         int retval = 0;
1073
1074         retval = platform_driver_probe(&asic3_device_driver, asic3_probe);
1075
1076         return retval;
1077 }
1078
1079 subsys_initcall(asic3_init);