mfd: do tcb6393xb state restore on resume only if requested
[linux-2.6.git] / 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/clk.h>
23 #include <linux/err.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         TC6393XB_CELL_MMC,
116 };
117
118 /*--------------------------------------------------------------------------*/
119
120 static int tc6393xb_nand_enable(struct platform_device *nand)
121 {
122         struct platform_device *dev = to_platform_device(nand->dev.parent);
123         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
124         unsigned long flags;
125
126         spin_lock_irqsave(&tc6393xb->lock, flags);
127
128         /* SMD buffer on */
129         dev_dbg(&dev->dev, "SMD buffer on\n");
130         tmio_iowrite8(0xff, tc6393xb->scr + SCR_GPI_BCR(1));
131
132         spin_unlock_irqrestore(&tc6393xb->lock, flags);
133
134         return 0;
135 }
136
137 static struct resource __devinitdata tc6393xb_nand_resources[] = {
138         {
139                 .start  = 0x1000,
140                 .end    = 0x1007,
141                 .flags  = IORESOURCE_MEM,
142         },
143         {
144                 .start  = 0x0100,
145                 .end    = 0x01ff,
146                 .flags  = IORESOURCE_MEM,
147         },
148         {
149                 .start  = IRQ_TC6393_NAND,
150                 .end    = IRQ_TC6393_NAND,
151                 .flags  = IORESOURCE_IRQ,
152         },
153 };
154
155 static struct resource __devinitdata tc6393xb_mmc_resources[] = {
156         {
157                 .start  = 0x800,
158                 .end    = 0x9ff,
159                 .flags  = IORESOURCE_MEM,
160         },
161         {
162                 .start  = 0x200,
163                 .end    = 0x2ff,
164                 .flags  = IORESOURCE_MEM,
165         },
166         {
167                 .start  = IRQ_TC6393_MMC,
168                 .end    = IRQ_TC6393_MMC,
169                 .flags  = IORESOURCE_IRQ,
170         },
171 };
172
173 static struct mfd_cell __devinitdata tc6393xb_cells[] = {
174         [TC6393XB_CELL_NAND] = {
175                 .name = "tmio-nand",
176                 .enable = tc6393xb_nand_enable,
177                 .num_resources = ARRAY_SIZE(tc6393xb_nand_resources),
178                 .resources = tc6393xb_nand_resources,
179         },
180         [TC6393XB_CELL_MMC] = {
181                 .name = "tmio-mmc",
182                 .num_resources = ARRAY_SIZE(tc6393xb_mmc_resources),
183                 .resources = tc6393xb_mmc_resources,
184         },
185 };
186
187 /*--------------------------------------------------------------------------*/
188
189 static int tc6393xb_gpio_get(struct gpio_chip *chip,
190                 unsigned offset)
191 {
192         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
193
194         /* XXX: does dsr also represent inputs? */
195         return tmio_ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8))
196                 & TC_GPIO_BIT(offset);
197 }
198
199 static void __tc6393xb_gpio_set(struct gpio_chip *chip,
200                 unsigned offset, int value)
201 {
202         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
203         u8  dsr;
204
205         dsr = tmio_ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8));
206         if (value)
207                 dsr |= TC_GPIO_BIT(offset);
208         else
209                 dsr &= ~TC_GPIO_BIT(offset);
210
211         tmio_iowrite8(dsr, tc6393xb->scr + SCR_GPO_DSR(offset / 8));
212 }
213
214 static void tc6393xb_gpio_set(struct gpio_chip *chip,
215                 unsigned offset, int value)
216 {
217         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
218         unsigned long flags;
219
220         spin_lock_irqsave(&tc6393xb->lock, flags);
221
222         __tc6393xb_gpio_set(chip, offset, value);
223
224         spin_unlock_irqrestore(&tc6393xb->lock, flags);
225 }
226
227 static int tc6393xb_gpio_direction_input(struct gpio_chip *chip,
228                         unsigned offset)
229 {
230         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
231         unsigned long flags;
232         u8 doecr;
233
234         spin_lock_irqsave(&tc6393xb->lock, flags);
235
236         doecr = tmio_ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
237         doecr &= ~TC_GPIO_BIT(offset);
238         tmio_iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
239
240         spin_unlock_irqrestore(&tc6393xb->lock, flags);
241
242         return 0;
243 }
244
245 static int tc6393xb_gpio_direction_output(struct gpio_chip *chip,
246                         unsigned offset, int value)
247 {
248         struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
249         unsigned long flags;
250         u8 doecr;
251
252         spin_lock_irqsave(&tc6393xb->lock, flags);
253
254         __tc6393xb_gpio_set(chip, offset, value);
255
256         doecr = tmio_ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
257         doecr |= TC_GPIO_BIT(offset);
258         tmio_iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
259
260         spin_unlock_irqrestore(&tc6393xb->lock, flags);
261
262         return 0;
263 }
264
265 static int tc6393xb_register_gpio(struct tc6393xb *tc6393xb, int gpio_base)
266 {
267         tc6393xb->gpio.label = "tc6393xb";
268         tc6393xb->gpio.base = gpio_base;
269         tc6393xb->gpio.ngpio = 16;
270         tc6393xb->gpio.set = tc6393xb_gpio_set;
271         tc6393xb->gpio.get = tc6393xb_gpio_get;
272         tc6393xb->gpio.direction_input = tc6393xb_gpio_direction_input;
273         tc6393xb->gpio.direction_output = tc6393xb_gpio_direction_output;
274
275         return gpiochip_add(&tc6393xb->gpio);
276 }
277
278 /*--------------------------------------------------------------------------*/
279
280 static void
281 tc6393xb_irq(unsigned int irq, struct irq_desc *desc)
282 {
283         struct tc6393xb *tc6393xb = get_irq_data(irq);
284         unsigned int isr;
285         unsigned int i, irq_base;
286
287         irq_base = tc6393xb->irq_base;
288
289         while ((isr = tmio_ioread8(tc6393xb->scr + SCR_ISR) &
290                                 ~tmio_ioread8(tc6393xb->scr + SCR_IMR)))
291                 for (i = 0; i < TC6393XB_NR_IRQS; i++) {
292                         if (isr & (1 << i))
293                                 generic_handle_irq(irq_base + i);
294                 }
295 }
296
297 static void tc6393xb_irq_ack(unsigned int irq)
298 {
299 }
300
301 static void tc6393xb_irq_mask(unsigned int irq)
302 {
303         struct tc6393xb *tc6393xb = get_irq_chip_data(irq);
304         unsigned long flags;
305         u8 imr;
306
307         spin_lock_irqsave(&tc6393xb->lock, flags);
308         imr = tmio_ioread8(tc6393xb->scr + SCR_IMR);
309         imr |= 1 << (irq - tc6393xb->irq_base);
310         tmio_iowrite8(imr, tc6393xb->scr + SCR_IMR);
311         spin_unlock_irqrestore(&tc6393xb->lock, flags);
312 }
313
314 static void tc6393xb_irq_unmask(unsigned int irq)
315 {
316         struct tc6393xb *tc6393xb = get_irq_chip_data(irq);
317         unsigned long flags;
318         u8 imr;
319
320         spin_lock_irqsave(&tc6393xb->lock, flags);
321         imr = tmio_ioread8(tc6393xb->scr + SCR_IMR);
322         imr &= ~(1 << (irq - tc6393xb->irq_base));
323         tmio_iowrite8(imr, tc6393xb->scr + SCR_IMR);
324         spin_unlock_irqrestore(&tc6393xb->lock, flags);
325 }
326
327 static struct irq_chip tc6393xb_chip = {
328         .name   = "tc6393xb",
329         .ack    = tc6393xb_irq_ack,
330         .mask   = tc6393xb_irq_mask,
331         .unmask = tc6393xb_irq_unmask,
332 };
333
334 static void tc6393xb_attach_irq(struct platform_device *dev)
335 {
336         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
337         unsigned int irq, irq_base;
338
339         irq_base = tc6393xb->irq_base;
340
341         for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) {
342                 set_irq_chip(irq, &tc6393xb_chip);
343                 set_irq_chip_data(irq, tc6393xb);
344                 set_irq_handler(irq, handle_edge_irq);
345                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
346         }
347
348         set_irq_type(tc6393xb->irq, IRQ_TYPE_EDGE_FALLING);
349         set_irq_data(tc6393xb->irq, tc6393xb);
350         set_irq_chained_handler(tc6393xb->irq, tc6393xb_irq);
351 }
352
353 static void tc6393xb_detach_irq(struct platform_device *dev)
354 {
355         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
356         unsigned int irq, irq_base;
357
358         set_irq_chained_handler(tc6393xb->irq, NULL);
359         set_irq_data(tc6393xb->irq, NULL);
360
361         irq_base = tc6393xb->irq_base;
362
363         for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) {
364                 set_irq_flags(irq, 0);
365                 set_irq_chip(irq, NULL);
366                 set_irq_chip_data(irq, NULL);
367         }
368 }
369
370 /*--------------------------------------------------------------------------*/
371
372 static int __devinit tc6393xb_probe(struct platform_device *dev)
373 {
374         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
375         struct tc6393xb *tc6393xb;
376         struct resource *iomem, *rscr;
377         int ret, temp;
378
379         iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
380         if (!iomem)
381                 return -EINVAL;
382
383         tc6393xb = kzalloc(sizeof *tc6393xb, GFP_KERNEL);
384         if (!tc6393xb) {
385                 ret = -ENOMEM;
386                 goto err_kzalloc;
387         }
388
389         spin_lock_init(&tc6393xb->lock);
390
391         platform_set_drvdata(dev, tc6393xb);
392
393         ret = platform_get_irq(dev, 0);
394         if (ret >= 0)
395                 tc6393xb->irq = ret;
396         else
397                 goto err_noirq;
398
399         tc6393xb->iomem = iomem;
400         tc6393xb->irq_base = tcpd->irq_base;
401
402         tc6393xb->clk = clk_get(&dev->dev, "CLK_CK3P6MI");
403         if (IS_ERR(tc6393xb->clk)) {
404                 ret = PTR_ERR(tc6393xb->clk);
405                 goto err_clk_get;
406         }
407
408         rscr = &tc6393xb->rscr;
409         rscr->name = "tc6393xb-core";
410         rscr->start = iomem->start;
411         rscr->end = iomem->start + 0xff;
412         rscr->flags = IORESOURCE_MEM;
413
414         ret = request_resource(iomem, rscr);
415         if (ret)
416                 goto err_request_scr;
417
418         tc6393xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
419         if (!tc6393xb->scr) {
420                 ret = -ENOMEM;
421                 goto err_ioremap;
422         }
423
424         ret = clk_enable(tc6393xb->clk);
425         if (ret)
426                 goto err_clk_enable;
427
428         ret = tcpd->enable(dev);
429         if (ret)
430                 goto err_enable;
431
432         iowrite8(0,                             tc6393xb->scr + SCR_FER);
433         iowrite16(tcpd->scr_pll2cr,             tc6393xb->scr + SCR_PLL2CR);
434         iowrite16(SCR_CCR_UNK1 | SCR_CCR_HCLK_48,
435                                                 tc6393xb->scr + SCR_CCR);
436         iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
437                   SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
438                   BIT(15),                      tc6393xb->scr + SCR_MCR);
439         iowrite16(tcpd->scr_gper,               tc6393xb->scr + SCR_GPER);
440         iowrite8(0,                             tc6393xb->scr + SCR_IRR);
441         iowrite8(0xbf,                          tc6393xb->scr + SCR_IMR);
442
443         printk(KERN_INFO "Toshiba tc6393xb revision %d at 0x%08lx, irq %d\n",
444                         tmio_ioread8(tc6393xb->scr + SCR_REVID),
445                         (unsigned long) iomem->start, tc6393xb->irq);
446
447         tc6393xb->gpio.base = -1;
448
449         if (tcpd->gpio_base >= 0) {
450                 ret = tc6393xb_register_gpio(tc6393xb, tcpd->gpio_base);
451                 if (ret)
452                         goto err_gpio_add;
453         }
454
455         tc6393xb_attach_irq(dev);
456
457         if (tcpd->setup) {
458                 ret = tcpd->setup(dev);
459                 if (ret)
460                         goto err_setup;
461         }
462
463         tc6393xb_cells[TC6393XB_CELL_NAND].driver_data = tcpd->nand_data;
464         tc6393xb_cells[TC6393XB_CELL_NAND].platform_data =
465                 &tc6393xb_cells[TC6393XB_CELL_NAND];
466         tc6393xb_cells[TC6393XB_CELL_NAND].data_size =
467                 sizeof(tc6393xb_cells[TC6393XB_CELL_NAND]);
468         tc6393xb_cells[TC6393XB_CELL_MMC].platform_data =
469                 &tc6393xb_cells[TC6393XB_CELL_MMC];
470         tc6393xb_cells[TC6393XB_CELL_MMC].data_size =
471                 sizeof(tc6393xb_cells[TC6393XB_CELL_MMC]);
472
473
474         ret = mfd_add_devices(&dev->dev, dev->id,
475                         tc6393xb_cells, ARRAY_SIZE(tc6393xb_cells),
476                         iomem, tcpd->irq_base);
477
478         if (!ret)
479                 return 0;
480
481         if (tcpd->teardown)
482                 tcpd->teardown(dev);
483
484 err_setup:
485         tc6393xb_detach_irq(dev);
486
487 err_gpio_add:
488         if (tc6393xb->gpio.base != -1)
489                 temp = gpiochip_remove(&tc6393xb->gpio);
490         tcpd->disable(dev);
491 err_clk_enable:
492         clk_disable(tc6393xb->clk);
493 err_enable:
494         iounmap(tc6393xb->scr);
495 err_ioremap:
496         release_resource(&tc6393xb->rscr);
497 err_request_scr:
498         clk_put(tc6393xb->clk);
499 err_noirq:
500 err_clk_get:
501         kfree(tc6393xb);
502 err_kzalloc:
503         return ret;
504 }
505
506 static int __devexit tc6393xb_remove(struct platform_device *dev)
507 {
508         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
509         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
510         int ret;
511
512         mfd_remove_devices(&dev->dev);
513
514         if (tcpd->teardown)
515                 tcpd->teardown(dev);
516
517         tc6393xb_detach_irq(dev);
518
519         if (tc6393xb->gpio.base != -1) {
520                 ret = gpiochip_remove(&tc6393xb->gpio);
521                 if (ret) {
522                         dev_err(&dev->dev, "Can't remove gpio chip: %d\n", ret);
523                         return ret;
524                 }
525         }
526
527         ret = tcpd->disable(dev);
528         clk_disable(tc6393xb->clk);
529         iounmap(tc6393xb->scr);
530         release_resource(&tc6393xb->rscr);
531         platform_set_drvdata(dev, NULL);
532         clk_put(tc6393xb->clk);
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, ret;
544
545         tc6393xb->suspend_state.ccr = ioread16(tc6393xb->scr + SCR_CCR);
546         tc6393xb->suspend_state.fer = ioread8(tc6393xb->scr + SCR_FER);
547
548         for (i = 0; i < 3; i++) {
549                 tc6393xb->suspend_state.gpo_dsr[i] =
550                         ioread8(tc6393xb->scr + SCR_GPO_DSR(i));
551                 tc6393xb->suspend_state.gpo_doecr[i] =
552                         ioread8(tc6393xb->scr + SCR_GPO_DOECR(i));
553                 tc6393xb->suspend_state.gpi_bcr[i] =
554                         ioread8(tc6393xb->scr + SCR_GPI_BCR(i));
555         }
556         ret = tcpd->suspend(dev);
557         clk_disable(tc6393xb->clk);
558
559         return ret;
560 }
561
562 static int tc6393xb_resume(struct platform_device *dev)
563 {
564         struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
565         struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
566         int ret;
567         int i;
568
569         clk_enable(tc6393xb->clk);
570
571         ret = tcpd->resume(dev);
572         if (ret)
573                 return ret;
574
575         if (!tcpd->resume_restore)
576                 return 0;
577
578         iowrite8(tc6393xb->suspend_state.fer,   tc6393xb->scr + SCR_FER);
579         iowrite16(tcpd->scr_pll2cr,             tc6393xb->scr + SCR_PLL2CR);
580         iowrite16(tc6393xb->suspend_state.ccr,  tc6393xb->scr + SCR_CCR);
581         iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
582                   SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
583                   BIT(15),                      tc6393xb->scr + SCR_MCR);
584         iowrite16(tcpd->scr_gper,               tc6393xb->scr + SCR_GPER);
585         iowrite8(0,                             tc6393xb->scr + SCR_IRR);
586         iowrite8(0xbf,                          tc6393xb->scr + SCR_IMR);
587
588         for (i = 0; i < 3; i++) {
589                 iowrite8(tc6393xb->suspend_state.gpo_dsr[i],
590                                         tc6393xb->scr + SCR_GPO_DSR(i));
591                 iowrite8(tc6393xb->suspend_state.gpo_doecr[i],
592                                         tc6393xb->scr + SCR_GPO_DOECR(i));
593                 iowrite8(tc6393xb->suspend_state.gpi_bcr[i],
594                                         tc6393xb->scr + SCR_GPI_BCR(i));
595         }
596
597         return 0;
598 }
599 #else
600 #define tc6393xb_suspend NULL
601 #define tc6393xb_resume NULL
602 #endif
603
604 static struct platform_driver tc6393xb_driver = {
605         .probe = tc6393xb_probe,
606         .remove = __devexit_p(tc6393xb_remove),
607         .suspend = tc6393xb_suspend,
608         .resume = tc6393xb_resume,
609
610         .driver = {
611                 .name = "tc6393xb",
612                 .owner = THIS_MODULE,
613         },
614 };
615
616 static int __init tc6393xb_init(void)
617 {
618         return platform_driver_register(&tc6393xb_driver);
619 }
620
621 static void __exit tc6393xb_exit(void)
622 {
623         platform_driver_unregister(&tc6393xb_driver);
624 }
625
626 subsys_initcall(tc6393xb_init);
627 module_exit(tc6393xb_exit);
628
629 MODULE_LICENSE("GPL v2");
630 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov and Dirk Opfer");
631 MODULE_DESCRIPTION("tc6393xb Toshiba Mobile IO Controller");
632 MODULE_ALIAS("platform:tc6393xb");