git.oblomov.eu Git - linux-2.6/blob - drivers/mfd/tc6393xb.c

   1 /*
   2  * Toshiba TC6393XB SoC support
   3  *
   4  * Copyright(c) 2005-2006 Chris Humbert
   5  * Copyright(c) 2005 Dirk Opfer
   6  * Copyright(c) 2005 Ian Molton <spyro@f2s.com>
   7  * Copyright(c) 2007 Dmitry Baryshkov
   8  *
   9  * Based on code written by Sharp/Lineo for 2.4 kernels
  10  * Based on locomo.c
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/io.h>
  20 #include <linux/irq.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/fb.h>
  23 #include <linux/clk.h>
  24 #include <linux/mfd/core.h>
  25 #include <linux/mfd/tmio.h>
  26 #include <linux/mfd/tc6393xb.h>
  27 #include <linux/gpio.h>
  28
  29 #define SCR_REVID       0x08            /* b Revision ID        */
  30 #define SCR_ISR         0x50            /* b Interrupt Status   */
  31 #define SCR_IMR         0x52            /* b Interrupt Mask     */
  32 #define SCR_IRR         0x54            /* b Interrupt Routing  */
  33 #define SCR_GPER        0x60            /* w GP Enable          */
  34 #define SCR_GPI_SR(i)   (0x64 + (i))    /* b3 GPI Status        */
  35 #define SCR_GPI_IMR(i)  (0x68 + (i))    /* b3 GPI INT Mask      */
  36 #define SCR_GPI_EDER(i) (0x6c + (i))    /* b3 GPI Edge Detect Enable */
  37 #define SCR_GPI_LIR(i)  (0x70 + (i))    /* b3 GPI Level Invert  */
  38 #define SCR_GPO_DSR(i)  (0x78 + (i))    /* b3 GPO Data Set      */
  39 #define SCR_GPO_DOECR(i) (0x7c + (i))   /* b3 GPO Data OE Control */
  40 #define SCR_GP_IARCR(i) (0x80 + (i))    /* b3 GP Internal Active Register Control */
  41 #define SCR_GP_IARLCR(i) (0x84 + (i))   /* b3 GP INTERNAL Active Register Level Control */
  42 #define SCR_GPI_BCR(i)  (0x88 + (i))    /* b3 GPI Buffer Control */
  43 #define SCR_GPA_IARCR   0x8c            /* w GPa Internal Active Register Control */
  44 #define SCR_GPA_IARLCR  0x90            /* w GPa Internal Active Register Level Control */
  45 #define SCR_GPA_BCR     0x94            /* w GPa Buffer Control */
  46 #define SCR_CCR         0x98            /* w Clock Control      */
  47 #define SCR_PLL2CR      0x9a            /* w PLL2 Control       */
  48 #define SCR_PLL1CR      0x9c            /* l PLL1 Control       */
  49 #define SCR_DIARCR      0xa0            /* b Device Internal Active Register Control */
  50 #define SCR_DBOCR       0xa1            /* b Device Buffer Off Control */
  51 #define SCR_FER         0xe0            /* b Function Enable    */
  52 #define SCR_MCR         0xe4            /* w Mode Control       */
  53 #define SCR_CONFIG      0xfc            /* b Configuration Control */
  54 #define SCR_DEBUG       0xff            /* b Debug              */
  55
  56 #define SCR_CCR_CK32K   BIT(0)
  57 #define SCR_CCR_USBCK   BIT(1)
  58 #define SCR_CCR_UNK1    BIT(4)
  59 #define SCR_CCR_MCLK_MASK       (7 << 8)
  60 #define SCR_CCR_MCLK_OFF        (0 << 8)
  61 #define SCR_CCR_MCLK_12 (1 << 8)
  62 #define SCR_CCR_MCLK_24 (2 << 8)
  63 #define SCR_CCR_MCLK_48 (3 << 8)
  64 #define SCR_CCR_HCLK_MASK       (3 << 12)
  65 #define SCR_CCR_HCLK_24 (0 << 12)
  66 #define SCR_CCR_HCLK_48 (1 << 12)
  67
  68 #define SCR_FER_USBEN           BIT(0)  /* USB host enable */
  69 #define SCR_FER_LCDCVEN         BIT(1)  /* polysilicon TFT enable */
  70 #define SCR_FER_SLCDEN          BIT(2)  /* SLCD enable */
  71
  72 #define SCR_MCR_RDY_MASK                (3 << 0)
  73 #define SCR_MCR_RDY_OPENDRAIN   (0 << 0)
  74 #define SCR_MCR_RDY_TRISTATE    (1 << 0)
  75 #define SCR_MCR_RDY_PUSHPULL    (2 << 0)
  76 #define SCR_MCR_RDY_UNK         BIT(2)
  77 #define SCR_MCR_RDY_EN          BIT(3)
  78 #define SCR_MCR_INT_MASK                (3 << 4)
  79 #define SCR_MCR_INT_OPENDRAIN   (0 << 4)
  80 #define SCR_MCR_INT_TRISTATE    (1 << 4)
  81 #define SCR_MCR_INT_PUSHPULL    (2 << 4)
  82 #define SCR_MCR_INT_UNK         BIT(6)
  83 #define SCR_MCR_INT_EN          BIT(7)
  84 /* bits 8 - 16 are unknown */
  85
  86 #define TC_GPIO_BIT(i)          (1 << (i & 0x7))
  87
  88 /*--------------------------------------------------------------------------*/
  89
  90 struct tc6393xb {
  91         void __iomem            *scr;
  92
  93         struct gpio_chip        gpio;
  94
  95         struct clk              *clk; /* 3,6 Mhz */
  96
  97         spinlock_t              lock; /* protects RMW cycles */
  98
  99         struct {
 100                 u8              fer;
 101                 u16             ccr;
 102                 u8              gpi_bcr[3];
 103                 u8              gpo_dsr[3];
 104                 u8              gpo_doecr[3];
 105         } suspend_state;
 106
 107         struct resource         rscr;
 108         struct resource         *iomem;
 109         int                     irq;
 110         int                     irq_base;
 111 };
 112
 113 enum {
 114         TC6393XB_CELL_NAND,
 115 };
 116
 117 /*--------------------------------------------------------------------------*/
 118
 119 static int tc6393xb_nand_enable(struct platform_device *nand)
 120 {
 121         struct platform_device *dev = to_platform_device(nand->dev.parent);
 122         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
 123         unsigned long flags;
 124
 125         spin_lock_irqsave(&tc6393xb->lock, flags);
 126
 127         /* SMD buffer on */
 128         dev_dbg(&dev->dev, "SMD buffer on\n");
 129         iowrite8(0xff, tc6393xb->scr + SCR_GPI_BCR(1));
 130
 131         spin_unlock_irqrestore(&tc6393xb->lock, flags);
 132
 133         return 0;
 134 }
 135
 136 static struct resource __devinitdata tc6393xb_nand_resources[] = {
 137         {
 138                 .name   = TMIO_NAND_CONFIG,
 139                 .start  = 0x0100,
 140                 .end    = 0x01ff,
 141                 .flags  = IORESOURCE_MEM,
 142         },
 143         {
 144                 .name   = TMIO_NAND_CONTROL,
 145                 .start  = 0x1000,
 146                 .end    = 0x1007,
 147                 .flags  = IORESOURCE_MEM,
 148         },
 149         {
 150                 .name   = TMIO_NAND_IRQ,
 151                 .start  = IRQ_TC6393_NAND,
 152                 .end    = IRQ_TC6393_NAND,
 153                 .flags  = IORESOURCE_IRQ,
 154         },
 155 };
 156
 157 static struct mfd_cell __devinitdata tc6393xb_cells[] = {
 158         [TC6393XB_CELL_NAND] = {
 159                 .name = "tmio-nand",
 160                 .enable = tc6393xb_nand_enable,
 161                 .num_resources = ARRAY_SIZE(tc6393xb_nand_resources),
 162                 .resources = tc6393xb_nand_resources,
 163         },
 164 };
 165
 166 /*--------------------------------------------------------------------------*/
 167
 168 static int tc6393xb_gpio_get(struct gpio_chip *chip,
 169                 unsigned offset)
 170 {
 171         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
 172
 173         /* XXX: does dsr also represent inputs? */
 174         return ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8))
 175                 & TC_GPIO_BIT(offset);
 176 }
 177
 178 static void __tc6393xb_gpio_set(struct gpio_chip *chip,
 179                 unsigned offset, int value)
 180 {
 181         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
 182         u8  dsr;
 183
 184         dsr = ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8));
 185         if (value)
 186                 dsr |= TC_GPIO_BIT(offset);
 187         else
 188                 dsr &= ~TC_GPIO_BIT(offset);
 189
 190         iowrite8(dsr, tc6393xb->scr + SCR_GPO_DSR(offset / 8));
 191 }
 192
 193 static void tc6393xb_gpio_set(struct gpio_chip *chip,
 194                 unsigned offset, int value)
 195 {
 196         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
 197         unsigned long flags;
 198
 199         spin_lock_irqsave(&tc6393xb->lock, flags);
 200
 201         __tc6393xb_gpio_set(chip, offset, value);
 202
 203         spin_unlock_irqrestore(&tc6393xb->lock, flags);
 204 }
 205
 206 static int tc6393xb_gpio_direction_input(struct gpio_chip *chip,
 207                         unsigned offset)
 208 {
 209         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
 210         unsigned long flags;
 211         u8 doecr;
 212
 213         spin_lock_irqsave(&tc6393xb->lock, flags);
 214
 215         doecr = ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
 216         doecr &= ~TC_GPIO_BIT(offset);
 217         iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
 218
 219         spin_unlock_irqrestore(&tc6393xb->lock, flags);
 220
 221         return 0;
 222 }
 223
 224 static int tc6393xb_gpio_direction_output(struct gpio_chip *chip,
 225                         unsigned offset, int value)
 226 {
 227         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
 228         unsigned long flags;
 229         u8 doecr;
 230
 231         spin_lock_irqsave(&tc6393xb->lock, flags);
 232
 233         __tc6393xb_gpio_set(chip, offset, value);
 234
 235         doecr = ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
 236         doecr |= TC_GPIO_BIT(offset);
 237         iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
 238
 239         spin_unlock_irqrestore(&tc6393xb->lock, flags);
 240
 241         return 0;
 242 }
 243
 244 static int tc6393xb_register_gpio(struct tc6393xb *tc6393xb, int gpio_base)
 245 {
 246         tc6393xb->gpio.label = "tc6393xb";
 247         tc6393xb->gpio.base = gpio_base;
 248         tc6393xb->gpio.ngpio = 16;
 249         tc6393xb->gpio.set = tc6393xb_gpio_set;
 250         tc6393xb->gpio.get = tc6393xb_gpio_get;
 251         tc6393xb->gpio.direction_input = tc6393xb_gpio_direction_input;
 252         tc6393xb->gpio.direction_output = tc6393xb_gpio_direction_output;
 253
 254         return gpiochip_add(&tc6393xb->gpio);
 255 }
 256
 257 /*--------------------------------------------------------------------------*/
 258
 259 static void
 260 tc6393xb_irq(unsigned int irq, struct irq_desc *desc)
 261 {
 262         struct tc6393xb *tc6393xb = get_irq_data(irq);
 263         unsigned int isr;
 264         unsigned int i, irq_base;
 265
 266         irq_base = tc6393xb->irq_base;
 267
 268         while ((isr = ioread8(tc6393xb->scr + SCR_ISR) &
 269                                 ~ioread8(tc6393xb->scr + SCR_IMR)))
 270                 for (i = 0; i < TC6393XB_NR_IRQS; i++) {
 271                         if (isr & (1 << i))
 272                                 generic_handle_irq(irq_base + i);
 273                 }
 274 }
 275
 276 static void tc6393xb_irq_ack(unsigned int irq)
 277 {
 278 }
 279
 280 static void tc6393xb_irq_mask(unsigned int irq)
 281 {
 282         struct tc6393xb *tc6393xb = get_irq_chip_data(irq);
 283         unsigned long flags;
 284         u8 imr;
 285
 286         spin_lock_irqsave(&tc6393xb->lock, flags);
 287         imr = ioread8(tc6393xb->scr + SCR_IMR);
 288         imr |= 1 << (irq - tc6393xb->irq_base);
 289         iowrite8(imr, tc6393xb->scr + SCR_IMR);
 290         spin_unlock_irqrestore(&tc6393xb->lock, flags);
 291 }
 292
 293 static void tc6393xb_irq_unmask(unsigned int irq)
 294 {
 295         struct tc6393xb *tc6393xb = get_irq_chip_data(irq);
 296         unsigned long flags;
 297         u8 imr;
 298
 299         spin_lock_irqsave(&tc6393xb->lock, flags);
 300         imr = ioread8(tc6393xb->scr + SCR_IMR);
 301         imr &= ~(1 << (irq - tc6393xb->irq_base));
 302         iowrite8(imr, tc6393xb->scr + SCR_IMR);
 303         spin_unlock_irqrestore(&tc6393xb->lock, flags);
 304 }
 305
 306 static struct irq_chip tc6393xb_chip = {
 307         .name   = "tc6393xb",
 308         .ack    = tc6393xb_irq_ack,
 309         .mask   = tc6393xb_irq_mask,
 310         .unmask = tc6393xb_irq_unmask,
 311 };
 312
 313 static void tc6393xb_attach_irq(struct platform_device *dev)
 314 {
 315         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
 316         unsigned int irq, irq_base;
 317
 318         irq_base = tc6393xb->irq_base;
 319
 320         for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) {
 321                 set_irq_chip(irq, &tc6393xb_chip);
 322                 set_irq_chip_data(irq, tc6393xb);
 323                 set_irq_handler(irq, handle_edge_irq);
 324                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 325         }
 326
 327         set_irq_type(tc6393xb->irq, IRQ_TYPE_EDGE_FALLING);
 328         set_irq_data(tc6393xb->irq, tc6393xb);
 329         set_irq_chained_handler(tc6393xb->irq, tc6393xb_irq);
 330 }
 331
 332 static void tc6393xb_detach_irq(struct platform_device *dev)
 333 {
 334         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
 335         unsigned int irq, irq_base;
 336
 337         set_irq_chained_handler(tc6393xb->irq, NULL);
 338         set_irq_data(tc6393xb->irq, NULL);
 339
 340         irq_base = tc6393xb->irq_base;
 341
 342         for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) {
 343                 set_irq_flags(irq, 0);
 344                 set_irq_chip(irq, NULL);
 345                 set_irq_chip_data(irq, NULL);
 346         }
 347 }
 348
 349 /*--------------------------------------------------------------------------*/
 350
 351 static int tc6393xb_hw_init(struct platform_device *dev)
 352 {
 353         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
 354         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
 355         int i;
 356
 357         iowrite8(tc6393xb->suspend_state.fer,   tc6393xb->scr + SCR_FER);
 358         iowrite16(tcpd->scr_pll2cr,             tc6393xb->scr + SCR_PLL2CR);
 359         iowrite16(tc6393xb->suspend_state.ccr,  tc6393xb->scr + SCR_CCR);
 360         iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
 361                   SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
 362                   BIT(15),                      tc6393xb->scr + SCR_MCR);
 363         iowrite16(tcpd->scr_gper,               tc6393xb->scr + SCR_GPER);
 364         iowrite8(0,                             tc6393xb->scr + SCR_IRR);
 365         iowrite8(0xbf,                          tc6393xb->scr + SCR_IMR);
 366
 367         for (i = 0; i < 3; i++) {
 368                 iowrite8(tc6393xb->suspend_state.gpo_dsr[i],
 369                                         tc6393xb->scr + SCR_GPO_DSR(i));
 370                 iowrite8(tc6393xb->suspend_state.gpo_doecr[i],
 371                                         tc6393xb->scr + SCR_GPO_DOECR(i));
 372                 iowrite8(tc6393xb->suspend_state.gpi_bcr[i],
 373                                         tc6393xb->scr + SCR_GPI_BCR(i));
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int __devinit tc6393xb_probe(struct platform_device *dev)
 380 {
 381         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
 382         struct tc6393xb *tc6393xb;
 383         struct resource *iomem;
 384         struct resource *rscr;
 385         int retval, temp;
 386         int i;
 387
 388         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 389         if (!iomem)
 390                 return -EINVAL;
 391
 392         tc6393xb = kzalloc(sizeof *tc6393xb, GFP_KERNEL);
 393         if (!tc6393xb) {
 394                 retval = -ENOMEM;
 395                 goto err_kzalloc;
 396         }
 397
 398         spin_lock_init(&tc6393xb->lock);
 399
 400         platform_set_drvdata(dev, tc6393xb);
 401         tc6393xb->iomem = iomem;
 402         tc6393xb->irq = platform_get_irq(dev, 0);
 403         tc6393xb->irq_base = tcpd->irq_base;
 404
 405         tc6393xb->clk = clk_get(&dev->dev, "GPIO27_CLK" /* "CK3P6MI" */);
 406         if (IS_ERR(tc6393xb->clk)) {
 407                 retval = PTR_ERR(tc6393xb->clk);
 408                 goto err_clk_get;
 409         }
 410
 411         rscr = &tc6393xb->rscr;
 412         rscr->name = "tc6393xb-core";
 413         rscr->start = iomem->start;
 414         rscr->end = iomem->start + 0xff;
 415         rscr->flags = IORESOURCE_MEM;
 416
 417         retval = request_resource(iomem, rscr);
 418         if (retval)
 419                 goto err_request_scr;
 420
 421         tc6393xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
 422         if (!tc6393xb->scr) {
 423                 retval = -ENOMEM;
 424                 goto err_ioremap;
 425         }
 426
 427         retval = clk_enable(tc6393xb->clk);
 428         if (retval)
 429                 goto err_clk_enable;
 430
 431         retval = tcpd->enable(dev);
 432         if (retval)
 433                 goto err_enable;
 434
 435         tc6393xb->suspend_state.fer = 0;
 436         for (i = 0; i < 3; i++) {
 437                 tc6393xb->suspend_state.gpo_dsr[i] =
 438                         (tcpd->scr_gpo_dsr >> (8 * i)) & 0xff;
 439                 tc6393xb->suspend_state.gpo_doecr[i] =
 440                         (tcpd->scr_gpo_doecr >> (8 * i)) & 0xff;
 441         }
 442         /*
 443          * It may be necessary to change this back to
 444          * platform-dependant code
 445          */
 446         tc6393xb->suspend_state.ccr = SCR_CCR_UNK1 |
 447                                         SCR_CCR_HCLK_48;
 448
 449         retval = tc6393xb_hw_init(dev);
 450         if (retval)
 451                 goto err_hw_init;
 452
 453         printk(KERN_INFO "Toshiba tc6393xb revision %d at 0x%08lx, irq %d\n",
 454                         ioread8(tc6393xb->scr + SCR_REVID),
 455                         (unsigned long) iomem->start, tc6393xb->irq);
 456
 457         tc6393xb->gpio.base = -1;
 458
 459         if (tcpd->gpio_base >= 0) {
 460                 retval = tc6393xb_register_gpio(tc6393xb, tcpd->gpio_base);
 461                 if (retval)
 462                         goto err_gpio_add;
 463         }
 464
 465         if (tc6393xb->irq)
 466                 tc6393xb_attach_irq(dev);
 467
 468         tc6393xb_cells[TC6393XB_CELL_NAND].driver_data = tcpd->nand_data;
 469         tc6393xb_cells[TC6393XB_CELL_NAND].platform_data =
 470                 &tc6393xb_cells[TC6393XB_CELL_NAND];
 471         tc6393xb_cells[TC6393XB_CELL_NAND].data_size =
 472                 sizeof(tc6393xb_cells[TC6393XB_CELL_NAND]);
 473
 474         retval = mfd_add_devices(&dev->dev, dev->id,
 475                         tc6393xb_cells, ARRAY_SIZE(tc6393xb_cells),
 476                         iomem, tcpd->irq_base);
 477
 478         return 0;
 479
 480         if (tc6393xb->irq)
 481                 tc6393xb_detach_irq(dev);
 482
 483 err_gpio_add:
 484         if (tc6393xb->gpio.base != -1)
 485                 temp = gpiochip_remove(&tc6393xb->gpio);
 486 err_hw_init:
 487         tcpd->disable(dev);
 488 err_clk_enable:
 489         clk_disable(tc6393xb->clk);
 490 err_enable:
 491         iounmap(tc6393xb->scr);
 492 err_ioremap:
 493         release_resource(&tc6393xb->rscr);
 494 err_request_scr:
 495         clk_put(tc6393xb->clk);
 496 err_clk_get:
 497         kfree(tc6393xb);
 498 err_kzalloc:
 499         return retval;
 500 }
 501
 502 static int __devexit tc6393xb_remove(struct platform_device *dev)
 503 {
 504         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
 505         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
 506         int ret;
 507
 508         mfd_remove_devices(&dev->dev);
 509
 510         if (tc6393xb->irq)
 511                 tc6393xb_detach_irq(dev);
 512
 513         if (tc6393xb->gpio.base != -1) {
 514                 ret = gpiochip_remove(&tc6393xb->gpio);
 515                 if (ret) {
 516                         dev_err(&dev->dev, "Can't remove gpio chip: %d\n", ret);
 517                         return ret;
 518                 }
 519         }
 520
 521         ret = tcpd->disable(dev);
 522
 523         clk_disable(tc6393xb->clk);
 524
 525         iounmap(tc6393xb->scr);
 526
 527         release_resource(&tc6393xb->rscr);
 528
 529         platform_set_drvdata(dev, NULL);
 530
 531         clk_put(tc6393xb->clk);
 532
 533         kfree(tc6393xb);
 534
 535         return ret;
 536 }
 537
 538 #ifdef CONFIG_PM
 539 static int tc6393xb_suspend(struct platform_device *dev, pm_message_t state)
 540 {
 541         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
 542         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
 543         int i;
 544
 545
 546         tc6393xb->suspend_state.ccr = ioread16(tc6393xb->scr + SCR_CCR);
 547         tc6393xb->suspend_state.fer = ioread8(tc6393xb->scr + SCR_FER);
 548
 549         for (i = 0; i < 3; i++) {
 550                 tc6393xb->suspend_state.gpo_dsr[i] =
 551                         ioread8(tc6393xb->scr + SCR_GPO_DSR(i));
 552                 tc6393xb->suspend_state.gpo_doecr[i] =
 553                         ioread8(tc6393xb->scr + SCR_GPO_DOECR(i));
 554                 tc6393xb->suspend_state.gpi_bcr[i] =
 555                         ioread8(tc6393xb->scr + SCR_GPI_BCR(i));
 556         }
 557
 558         return tcpd->suspend(dev);
 559 }
 560
 561 static int tc6393xb_resume(struct platform_device *dev)
 562 {
 563         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
 564         int ret = tcpd->resume(dev);
 565
 566         if (ret)
 567                 return ret;
 568
 569         return tc6393xb_hw_init(dev);
 570 }
 571 #else
 572 #define tc6393xb_suspend NULL
 573 #define tc6393xb_resume NULL
 574 #endif
 575
 576 static struct platform_driver tc6393xb_driver = {
 577         .probe = tc6393xb_probe,
 578         .remove = __devexit_p(tc6393xb_remove),
 579         .suspend = tc6393xb_suspend,
 580         .resume = tc6393xb_resume,
 581
 582         .driver = {
 583                 .name = "tc6393xb",
 584                 .owner = THIS_MODULE,
 585         },
 586 };
 587
 588 static int __init tc6393xb_init(void)
 589 {
 590         return platform_driver_register(&tc6393xb_driver);
 591 }
 592
 593 static void __exit tc6393xb_exit(void)
 594 {
 595         platform_driver_unregister(&tc6393xb_driver);
 596 }
 597
 598 subsys_initcall(tc6393xb_init);
 599 module_exit(tc6393xb_exit);
 600
 601 MODULE_LICENSE("GPL");
 602 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov and Dirk Opfer");
 603 MODULE_DESCRIPTION("tc6393xb Toshiba Mobile IO Controller");
 604 MODULE_ALIAS("platform:tc6393xb");