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