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/irq.h>
  21 #include <linux/gpio.h>
  22 #include <linux/io.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <linux/mfd/asic3.h>
  27
  28 struct asic3 {
  29         void __iomem *mapping;
  30         unsigned int bus_shift;
  31         unsigned int irq_nr;
  32         unsigned int irq_base;
  33         spinlock_t lock;
  34         u16 irq_bothedge[4];
  35         struct gpio_chip gpio;
  36         struct device *dev;
  37 };
  38
  39 static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);
  40
  41 static inline void asic3_write_register(struct asic3 *asic,
  42                                  unsigned int reg, u32 value)
  43 {
  44         iowrite16(value, asic->mapping +
  45                   (reg >> asic->bus_shift));
  46 }
  47
  48 static inline u32 asic3_read_register(struct asic3 *asic,
  49                                unsigned int reg)
  50 {
  51         return ioread16(asic->mapping +
  52                         (reg >> asic->bus_shift));
  53 }
  54
  55 /* IRQs */
  56 #define MAX_ASIC_ISR_LOOPS    20
  57 #define ASIC3_GPIO_BASE_INCR \
  58         (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE)
  59
  60 static void asic3_irq_flip_edge(struct asic3 *asic,
  61                                 u32 base, int bit)
  62 {
  63         u16 edge;
  64         unsigned long flags;
  65
  66         spin_lock_irqsave(&asic->lock, flags);
  67         edge = asic3_read_register(asic,
  68                                    base + ASIC3_GPIO_EDGE_TRIGGER);
  69         edge ^= bit;
  70         asic3_write_register(asic,
  71                              base + ASIC3_GPIO_EDGE_TRIGGER, edge);
  72         spin_unlock_irqrestore(&asic->lock, flags);
  73 }
  74
  75 static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc)
  76 {
  77         int iter, i;
  78         unsigned long flags;
  79         struct asic3 *asic;
  80
  81         desc->chip->ack(irq);
  82
  83         asic = desc->handler_data;
  84
  85         for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
  86                 u32 status;
  87                 int bank;
  88
  89                 spin_lock_irqsave(&asic->lock, flags);
  90                 status = asic3_read_register(asic,
  91                                              ASIC3_OFFSET(INTR, P_INT_STAT));
  92                 spin_unlock_irqrestore(&asic->lock, flags);
  93
  94                 /* Check all ten register bits */
  95                 if ((status & 0x3ff) == 0)
  96                         break;
  97
  98                 /* Handle GPIO IRQs */
  99                 for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) {
 100                         if (status & (1 << bank)) {
 101                                 unsigned long base, istat;
 102
 103                                 base = ASIC3_GPIO_A_BASE
 104                                        + bank * ASIC3_GPIO_BASE_INCR;
 105
 106                                 spin_lock_irqsave(&asic->lock, flags);
 107                                 istat = asic3_read_register(asic,
 108                                                             base +
 109                                                             ASIC3_GPIO_INT_STATUS);
 110                                 /* Clearing IntStatus */
 111                                 asic3_write_register(asic,
 112                                                      base +
 113                                                      ASIC3_GPIO_INT_STATUS, 0);
 114                                 spin_unlock_irqrestore(&asic->lock, flags);
 115
 116                                 for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
 117                                         int bit = (1 << i);
 118                                         unsigned int irqnr;
 119
 120                                         if (!(istat & bit))
 121                                                 continue;
 122
 123                                         irqnr = asic->irq_base +
 124                                                 (ASIC3_GPIOS_PER_BANK * bank)
 125                                                 + i;
 126                                         desc = irq_to_desc(irqnr);
 127                                         desc->handle_irq(irqnr, desc);
 128                                         if (asic->irq_bothedge[bank] & bit)
 129                                                 asic3_irq_flip_edge(asic, base,
 130                                                                     bit);
 131                                 }
 132                         }
 133                 }
 134
 135                 /* Handle remaining IRQs in the status register */
 136                 for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
 137                         /* They start at bit 4 and go up */
 138                         if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) {
 139                                 desc = irq_to_desc(asic->irq_base + i);
 140                                 desc->handle_irq(asic->irq_base + i,
 141                                                  desc);
 142                         }
 143                 }
 144         }
 145
 146         if (iter >= MAX_ASIC_ISR_LOOPS)
 147                 dev_err(asic->dev, "interrupt processing overrun\n");
 148 }
 149
 150 static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
 151 {
 152         int n;
 153
 154         n = (irq - asic->irq_base) >> 4;
 155
 156         return (n * (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE));
 157 }
 158
 159 static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
 160 {
 161         return (irq - asic->irq_base) & 0xf;
 162 }
 163
 164 static void asic3_mask_gpio_irq(unsigned int irq)
 165 {
 166         struct asic3 *asic = get_irq_chip_data(irq);
 167         u32 val, bank, index;
 168         unsigned long flags;
 169
 170         bank = asic3_irq_to_bank(asic, irq);
 171         index = asic3_irq_to_index(asic, irq);
 172
 173         spin_lock_irqsave(&asic->lock, flags);
 174         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 175         val |= 1 << index;
 176         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 177         spin_unlock_irqrestore(&asic->lock, flags);
 178 }
 179
 180 static void asic3_mask_irq(unsigned int irq)
 181 {
 182         struct asic3 *asic = get_irq_chip_data(irq);
 183         int regval;
 184         unsigned long flags;
 185
 186         spin_lock_irqsave(&asic->lock, flags);
 187         regval = asic3_read_register(asic,
 188                                      ASIC3_INTR_BASE +
 189                                      ASIC3_INTR_INT_MASK);
 190
 191         regval &= ~(ASIC3_INTMASK_MASK0 <<
 192                     (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 193
 194         asic3_write_register(asic,
 195                              ASIC3_INTR_BASE +
 196                              ASIC3_INTR_INT_MASK,
 197                              regval);
 198         spin_unlock_irqrestore(&asic->lock, flags);
 199 }
 200
 201 static void asic3_unmask_gpio_irq(unsigned int irq)
 202 {
 203         struct asic3 *asic = get_irq_chip_data(irq);
 204         u32 val, bank, index;
 205         unsigned long flags;
 206
 207         bank = asic3_irq_to_bank(asic, irq);
 208         index = asic3_irq_to_index(asic, irq);
 209
 210         spin_lock_irqsave(&asic->lock, flags);
 211         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 212         val &= ~(1 << index);
 213         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 214         spin_unlock_irqrestore(&asic->lock, flags);
 215 }
 216
 217 static void asic3_unmask_irq(unsigned int irq)
 218 {
 219         struct asic3 *asic = get_irq_chip_data(irq);
 220         int regval;
 221         unsigned long flags;
 222
 223         spin_lock_irqsave(&asic->lock, flags);
 224         regval = asic3_read_register(asic,
 225                                      ASIC3_INTR_BASE +
 226                                      ASIC3_INTR_INT_MASK);
 227
 228         regval |= (ASIC3_INTMASK_MASK0 <<
 229                    (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 230
 231         asic3_write_register(asic,
 232                              ASIC3_INTR_BASE +
 233                              ASIC3_INTR_INT_MASK,
 234                              regval);
 235         spin_unlock_irqrestore(&asic->lock, flags);
 236 }
 237
 238 static int asic3_gpio_irq_type(unsigned int irq, unsigned int type)
 239 {
 240         struct asic3 *asic = get_irq_chip_data(irq);
 241         u32 bank, index;
 242         u16 trigger, level, edge, bit;
 243         unsigned long flags;
 244
 245         bank = asic3_irq_to_bank(asic, irq);
 246         index = asic3_irq_to_index(asic, irq);
 247         bit = 1<<index;
 248
 249         spin_lock_irqsave(&asic->lock, flags);
 250         level = asic3_read_register(asic,
 251                                     bank + ASIC3_GPIO_LEVEL_TRIGGER);
 252         edge = asic3_read_register(asic,
 253                                    bank + ASIC3_GPIO_EDGE_TRIGGER);
 254         trigger = asic3_read_register(asic,
 255                                       bank + ASIC3_GPIO_TRIGGER_TYPE);
 256         asic->irq_bothedge[(irq - asic->irq_base) >> 4] &= ~bit;
 257
 258         if (type == IRQ_TYPE_EDGE_RISING) {
 259                 trigger |= bit;
 260                 edge |= bit;
 261         } else if (type == IRQ_TYPE_EDGE_FALLING) {
 262                 trigger |= bit;
 263                 edge &= ~bit;
 264         } else if (type == IRQ_TYPE_EDGE_BOTH) {
 265                 trigger |= bit;
 266                 if (asic3_gpio_get(&asic->gpio, irq - asic->irq_base))
 267                         edge &= ~bit;
 268                 else
 269                         edge |= bit;
 270                 asic->irq_bothedge[(irq - asic->irq_base) >> 4] |= bit;
 271         } else if (type == IRQ_TYPE_LEVEL_LOW) {
 272                 trigger &= ~bit;
 273                 level &= ~bit;
 274         } else if (type == IRQ_TYPE_LEVEL_HIGH) {
 275                 trigger &= ~bit;
 276                 level |= bit;
 277         } else {
 278                 /*
 279                  * if type == IRQ_TYPE_NONE, we should mask interrupts, but
 280                  * be careful to not unmask them if mask was also called.
 281                  * Probably need internal state for mask.
 282                  */
 283                 dev_notice(asic->dev, "irq type not changed\n");
 284         }
 285         asic3_write_register(asic, bank + ASIC3_GPIO_LEVEL_TRIGGER,
 286                              level);
 287         asic3_write_register(asic, bank + ASIC3_GPIO_EDGE_TRIGGER,
 288                              edge);
 289         asic3_write_register(asic, bank + ASIC3_GPIO_TRIGGER_TYPE,
 290                              trigger);
 291         spin_unlock_irqrestore(&asic->lock, flags);
 292         return 0;
 293 }
 294
 295 static struct irq_chip asic3_gpio_irq_chip = {
 296         .name           = "ASIC3-GPIO",
 297         .ack            = asic3_mask_gpio_irq,
 298         .mask           = asic3_mask_gpio_irq,
 299         .unmask         = asic3_unmask_gpio_irq,
 300         .set_type       = asic3_gpio_irq_type,
 301 };
 302
 303 static struct irq_chip asic3_irq_chip = {
 304         .name           = "ASIC3",
 305         .ack            = asic3_mask_irq,
 306         .mask           = asic3_mask_irq,
 307         .unmask         = asic3_unmask_irq,
 308 };
 309
 310 static int __init asic3_irq_probe(struct platform_device *pdev)
 311 {
 312         struct asic3 *asic = platform_get_drvdata(pdev);
 313         unsigned long clksel = 0;
 314         unsigned int irq, irq_base;
 315         int ret;
 316
 317         ret = platform_get_irq(pdev, 0);
 318         if (ret < 0)
 319                 return ret;
 320         asic->irq_nr = ret;
 321
 322         /* turn on clock to IRQ controller */
 323         clksel |= CLOCK_SEL_CX;
 324         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 325                              clksel);
 326
 327         irq_base = asic->irq_base;
 328
 329         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 330                 if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
 331                         set_irq_chip(irq, &asic3_gpio_irq_chip);
 332                 else
 333                         set_irq_chip(irq, &asic3_irq_chip);
 334
 335                 set_irq_chip_data(irq, asic);
 336                 set_irq_handler(irq, handle_level_irq);
 337                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 338         }
 339
 340         asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK),
 341                              ASIC3_INTMASK_GINTMASK);
 342
 343         set_irq_chained_handler(asic->irq_nr, asic3_irq_demux);
 344         set_irq_type(asic->irq_nr, IRQ_TYPE_EDGE_RISING);
 345         set_irq_data(asic->irq_nr, asic);
 346
 347         return 0;
 348 }
 349
 350 static void asic3_irq_remove(struct platform_device *pdev)
 351 {
 352         struct asic3 *asic = platform_get_drvdata(pdev);
 353         unsigned int irq, irq_base;
 354
 355         irq_base = asic->irq_base;
 356
 357         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 358                 set_irq_flags(irq, 0);
 359                 set_irq_handler(irq, NULL);
 360                 set_irq_chip(irq, NULL);
 361                 set_irq_chip_data(irq, NULL);
 362         }
 363         set_irq_chained_handler(asic->irq_nr, NULL);
 364 }
 365
 366 /* GPIOs */
 367 static int asic3_gpio_direction(struct gpio_chip *chip,
 368                                 unsigned offset, int out)
 369 {
 370         u32 mask = ASIC3_GPIO_TO_MASK(offset), out_reg;
 371         unsigned int gpio_base;
 372         unsigned long flags;
 373         struct asic3 *asic;
 374
 375         asic = container_of(chip, struct asic3, gpio);
 376         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 377
 378         if (gpio_base > ASIC3_GPIO_D_BASE) {
 379                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 380                         gpio_base, offset);
 381                 return -EINVAL;
 382         }
 383
 384         spin_lock_irqsave(&asic->lock, flags);
 385
 386         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_DIRECTION);
 387
 388         /* Input is 0, Output is 1 */
 389         if (out)
 390                 out_reg |= mask;
 391         else
 392                 out_reg &= ~mask;
 393
 394         asic3_write_register(asic, gpio_base + ASIC3_GPIO_DIRECTION, out_reg);
 395
 396         spin_unlock_irqrestore(&asic->lock, flags);
 397
 398         return 0;
 399
 400 }
 401
 402 static int asic3_gpio_direction_input(struct gpio_chip *chip,
 403                                       unsigned offset)
 404 {
 405         return asic3_gpio_direction(chip, offset, 0);
 406 }
 407
 408 static int asic3_gpio_direction_output(struct gpio_chip *chip,
 409                                        unsigned offset, int value)
 410 {
 411         return asic3_gpio_direction(chip, offset, 1);
 412 }
 413
 414 static int asic3_gpio_get(struct gpio_chip *chip,
 415                           unsigned offset)
 416 {
 417         unsigned int gpio_base;
 418         u32 mask = ASIC3_GPIO_TO_MASK(offset);
 419         struct asic3 *asic;
 420
 421         asic = container_of(chip, struct asic3, gpio);
 422         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 423
 424         if (gpio_base > ASIC3_GPIO_D_BASE) {
 425                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 426                         gpio_base, offset);
 427                 return -EINVAL;
 428         }
 429
 430         return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask;
 431 }
 432
 433 static void asic3_gpio_set(struct gpio_chip *chip,
 434                            unsigned offset, int value)
 435 {
 436         u32 mask, out_reg;
 437         unsigned int gpio_base;
 438         unsigned long flags;
 439         struct asic3 *asic;
 440
 441         asic = container_of(chip, struct asic3, gpio);
 442         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 443
 444         if (gpio_base > ASIC3_GPIO_D_BASE) {
 445                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 446                         gpio_base, offset);
 447                 return;
 448         }
 449
 450         mask = ASIC3_GPIO_TO_MASK(offset);
 451
 452         spin_lock_irqsave(&asic->lock, flags);
 453
 454         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_OUT);
 455
 456         if (value)
 457                 out_reg |= mask;
 458         else
 459                 out_reg &= ~mask;
 460
 461         asic3_write_register(asic, gpio_base + ASIC3_GPIO_OUT, out_reg);
 462
 463         spin_unlock_irqrestore(&asic->lock, flags);
 464
 465         return;
 466 }
 467
 468 static __init int asic3_gpio_probe(struct platform_device *pdev,
 469                                    u16 *gpio_config, int num)
 470 {
 471         struct asic3 *asic = platform_get_drvdata(pdev);
 472         u16 alt_reg[ASIC3_NUM_GPIO_BANKS];
 473         u16 out_reg[ASIC3_NUM_GPIO_BANKS];
 474         u16 dir_reg[ASIC3_NUM_GPIO_BANKS];
 475         int i;
 476
 477         memzero(alt_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 478         memzero(out_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 479         memzero(dir_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 480
 481         /* Enable all GPIOs */
 482         asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, MASK), 0xffff);
 483         asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, MASK), 0xffff);
 484         asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, MASK), 0xffff);
 485         asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, MASK), 0xffff);
 486
 487         for (i = 0; i < num; i++) {
 488                 u8 alt, pin, dir, init, bank_num, bit_num;
 489                 u16 config = gpio_config[i];
 490
 491                 pin = ASIC3_CONFIG_GPIO_PIN(config);
 492                 alt = ASIC3_CONFIG_GPIO_ALT(config);
 493                 dir = ASIC3_CONFIG_GPIO_DIR(config);
 494                 init = ASIC3_CONFIG_GPIO_INIT(config);
 495
 496                 bank_num = ASIC3_GPIO_TO_BANK(pin);
 497                 bit_num = ASIC3_GPIO_TO_BIT(pin);
 498
 499                 alt_reg[bank_num] |= (alt << bit_num);
 500                 out_reg[bank_num] |= (init << bit_num);
 501                 dir_reg[bank_num] |= (dir << bit_num);
 502         }
 503
 504         for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) {
 505                 asic3_write_register(asic,
 506                                      ASIC3_BANK_TO_BASE(i) +
 507                                      ASIC3_GPIO_DIRECTION,
 508                                      dir_reg[i]);
 509                 asic3_write_register(asic,
 510                                      ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_OUT,
 511                                      out_reg[i]);
 512                 asic3_write_register(asic,
 513                                      ASIC3_BANK_TO_BASE(i) +
 514                                      ASIC3_GPIO_ALT_FUNCTION,
 515                                      alt_reg[i]);
 516         }
 517
 518         return gpiochip_add(&asic->gpio);
 519 }
 520
 521 static int asic3_gpio_remove(struct platform_device *pdev)
 522 {
 523         struct asic3 *asic = platform_get_drvdata(pdev);
 524
 525         return gpiochip_remove(&asic->gpio);
 526 }
 527
 528
 529 /* Core */
 530 static int __init asic3_probe(struct platform_device *pdev)
 531 {
 532         struct asic3_platform_data *pdata = pdev->dev.platform_data;
 533         struct asic3 *asic;
 534         struct resource *mem;
 535         unsigned long clksel;
 536         int map_size;
 537         int ret = 0;
 538
 539         asic = kzalloc(sizeof(struct asic3), GFP_KERNEL);
 540         if (asic == NULL) {
 541                 printk(KERN_ERR "kzalloc failed\n");
 542                 return -ENOMEM;
 543         }
 544
 545         spin_lock_init(&asic->lock);
 546         platform_set_drvdata(pdev, asic);
 547         asic->dev = &pdev->dev;
 548
 549         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 550         if (!mem) {
 551                 ret = -ENOMEM;
 552                 dev_err(asic->dev, "no MEM resource\n");
 553                 goto out_free;
 554         }
 555
 556         map_size = mem->end - mem->start + 1;
 557         asic->mapping = ioremap(mem->start, map_size);
 558         if (!asic->mapping) {
 559                 ret = -ENOMEM;
 560                 dev_err(asic->dev, "Couldn't ioremap\n");
 561                 goto out_free;
 562         }
 563
 564         asic->irq_base = pdata->irq_base;
 565
 566         /* calculate bus shift from mem resource */
 567         asic->bus_shift = 2 - (map_size >> 12);
 568
 569         clksel = 0;
 570         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
 571
 572         ret = asic3_irq_probe(pdev);
 573         if (ret < 0) {
 574                 dev_err(asic->dev, "Couldn't probe IRQs\n");
 575                 goto out_unmap;
 576         }
 577
 578         asic->gpio.base = pdata->gpio_base;
 579         asic->gpio.ngpio = ASIC3_NUM_GPIOS;
 580         asic->gpio.get = asic3_gpio_get;
 581         asic->gpio.set = asic3_gpio_set;
 582         asic->gpio.direction_input = asic3_gpio_direction_input;
 583         asic->gpio.direction_output = asic3_gpio_direction_output;
 584
 585         ret = asic3_gpio_probe(pdev,
 586                                pdata->gpio_config,
 587                                pdata->gpio_config_num);
 588         if (ret < 0) {
 589                 dev_err(asic->dev, "GPIO probe failed\n");
 590                 goto out_irq;
 591         }
 592
 593         dev_info(asic->dev, "ASIC3 Core driver\n");
 594
 595         return 0;
 596
 597  out_irq:
 598         asic3_irq_remove(pdev);
 599
 600  out_unmap:
 601         iounmap(asic->mapping);
 602
 603  out_free:
 604         kfree(asic);
 605
 606         return ret;
 607 }
 608
 609 static int asic3_remove(struct platform_device *pdev)
 610 {
 611         int ret;
 612         struct asic3 *asic = platform_get_drvdata(pdev);
 613
 614         ret = asic3_gpio_remove(pdev);
 615         if (ret < 0)
 616                 return ret;
 617         asic3_irq_remove(pdev);
 618
 619         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);
 620
 621         iounmap(asic->mapping);
 622
 623         kfree(asic);
 624
 625         return 0;
 626 }
 627
 628 static void asic3_shutdown(struct platform_device *pdev)
 629 {
 630 }
 631
 632 static struct platform_driver asic3_device_driver = {
 633         .driver         = {
 634                 .name   = "asic3",
 635         },
 636         .remove         = __devexit_p(asic3_remove),
 637         .shutdown       = asic3_shutdown,
 638 };
 639
 640 static int __init asic3_init(void)
 641 {
 642         int retval = 0;
 643         retval = platform_driver_probe(&asic3_device_driver, asic3_probe);
 644         return retval;
 645 }
 646
 647 subsys_initcall(asic3_init);