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blk: rq_data_dir() should not return a boolean
[cris-mirror.git] / arch / arm / common / locomo.c
blob304adea4bc52f4b8e32157dcd0f64d530ccb3a4c
1 /*
2 * linux/arch/arm/common/locomo.c
3 *
4 * Sharp LoCoMo 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 * This file contains all generic LoCoMo support.
11 *
12 * All initialization functions provided here are intended to be called
13 * from machine specific code with proper arguments when required.
14 *
15 * Based on sa1111.c
16 */
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/delay.h>
22 #include <linux/errno.h>
23 #include <linux/ioport.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
26 #include <linux/spinlock.h>
27 #include <linux/io.h>
28
29 #include <mach/hardware.h>
30 #include <asm/irq.h>
31 #include <asm/mach/irq.h>
32
33 #include <asm/hardware/locomo.h>
34
35 /* LoCoMo Interrupts */
36 #define IRQ_LOCOMO_KEY (0)
37 #define IRQ_LOCOMO_GPIO (1)
38 #define IRQ_LOCOMO_LT (2)
39 #define IRQ_LOCOMO_SPI (3)
40
41 /* M62332 output channel selection */
42 #define M62332_EVR_CH 1 /* M62332 volume channel number */
43 /* 0 : CH.1 , 1 : CH. 2 */
44 /* DAC send data */
45 #define M62332_SLAVE_ADDR 0x4e /* Slave address */
46 #define M62332_W_BIT 0x00 /* W bit (0 only) */
47 #define M62332_SUB_ADDR 0x00 /* Sub address */
48 #define M62332_A_BIT 0x00 /* A bit (0 only) */
49
50 /* DAC setup and hold times (expressed in us) */
51 #define DAC_BUS_FREE_TIME 5 /* 4.7 us */
52 #define DAC_START_SETUP_TIME 5 /* 4.7 us */
53 #define DAC_STOP_SETUP_TIME 4 /* 4.0 us */
54 #define DAC_START_HOLD_TIME 5 /* 4.7 us */
55 #define DAC_SCL_LOW_HOLD_TIME 5 /* 4.7 us */
56 #define DAC_SCL_HIGH_HOLD_TIME 4 /* 4.0 us */
57 #define DAC_DATA_SETUP_TIME 1 /* 250 ns */
58 #define DAC_DATA_HOLD_TIME 1 /* 300 ns */
59 #define DAC_LOW_SETUP_TIME 1 /* 300 ns */
60 #define DAC_HIGH_SETUP_TIME 1 /* 1000 ns */
61
62 /* the following is the overall data for the locomo chip */
63 struct locomo {
64 struct device *dev;
65 unsigned long phys;
66 unsigned int irq;
67 int irq_base;
68 spinlock_t lock;
69 void __iomem *base;
70 #ifdef CONFIG_PM
71 void *saved_state;
72 #endif
73 };
74
75 struct locomo_dev_info {
76 unsigned long offset;
77 unsigned long length;
78 unsigned int devid;
79 unsigned int irq[1];
80 const char * name;
81 };
82
83 /* All the locomo devices. If offset is non-zero, the mapbase for the
84 * locomo_dev will be set to the chip base plus offset. If offset is
85 * zero, then the mapbase for the locomo_dev will be set to zero. An
86 * offset of zero means the device only uses GPIOs or other helper
87 * functions inside this file */
88 static struct locomo_dev_info locomo_devices[] = {
89 {
90 .devid = LOCOMO_DEVID_KEYBOARD,
91 .irq = { IRQ_LOCOMO_KEY },
92 .name = "locomo-keyboard",
93 .offset = LOCOMO_KEYBOARD,
94 .length = 16,
95 },
96 {
97 .devid = LOCOMO_DEVID_FRONTLIGHT,
98 .irq = {},
99 .name = "locomo-frontlight",
100 .offset = LOCOMO_FRONTLIGHT,
101 .length = 8,
102
103 },
104 {
105 .devid = LOCOMO_DEVID_BACKLIGHT,
106 .irq = {},
107 .name = "locomo-backlight",
108 .offset = LOCOMO_BACKLIGHT,
109 .length = 8,
110 },
111 {
112 .devid = LOCOMO_DEVID_AUDIO,
113 .irq = {},
114 .name = "locomo-audio",
115 .offset = LOCOMO_AUDIO,
116 .length = 4,
117 },
118 {
119 .devid = LOCOMO_DEVID_LED,
120 .irq = {},
121 .name = "locomo-led",
122 .offset = LOCOMO_LED,
123 .length = 8,
124 },
125 {
126 .devid = LOCOMO_DEVID_UART,
127 .irq = {},
128 .name = "locomo-uart",
129 .offset = 0,
130 .length = 0,
131 },
132 {
133 .devid = LOCOMO_DEVID_SPI,
134 .irq = {},
135 .name = "locomo-spi",
136 .offset = LOCOMO_SPI,
137 .length = 0x30,
138 },
139 };
140
141 static void locomo_handler(unsigned int __irq, struct irq_desc *desc)
142 {
143 struct locomo *lchip = irq_desc_get_chip_data(desc);
144 int req, i;
145
146 /* Acknowledge the parent IRQ */
147 desc->irq_data.chip->irq_ack(&desc->irq_data);
148
149 /* check why this interrupt was generated */
150 req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
151
152 if (req) {
153 unsigned int irq;
154
155 /* generate the next interrupt(s) */
156 irq = lchip->irq_base;
157 for (i = 0; i <= 3; i++, irq++) {
158 if (req & (0x0100 << i)) {
159 generic_handle_irq(irq);
160 }
161
162 }
163 }
164 }
165
166 static void locomo_ack_irq(struct irq_data *d)
167 {
168 }
169
170 static void locomo_mask_irq(struct irq_data *d)
171 {
172 struct locomo *lchip = irq_data_get_irq_chip_data(d);
173 unsigned int r;
174 r = locomo_readl(lchip->base + LOCOMO_ICR);
175 r &= ~(0x0010 << (d->irq - lchip->irq_base));
176 locomo_writel(r, lchip->base + LOCOMO_ICR);
177 }
178
179 static void locomo_unmask_irq(struct irq_data *d)
180 {
181 struct locomo *lchip = irq_data_get_irq_chip_data(d);
182 unsigned int r;
183 r = locomo_readl(lchip->base + LOCOMO_ICR);
184 r |= (0x0010 << (d->irq - lchip->irq_base));
185 locomo_writel(r, lchip->base + LOCOMO_ICR);
186 }
187
188 static struct irq_chip locomo_chip = {
189 .name = "LOCOMO",
190 .irq_ack = locomo_ack_irq,
191 .irq_mask = locomo_mask_irq,
192 .irq_unmask = locomo_unmask_irq,
193 };
194
195 static void locomo_setup_irq(struct locomo *lchip)
196 {
197 int irq = lchip->irq_base;
198
199 /*
200 * Install handler for IRQ_LOCOMO_HW.
201 */
202 irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
203 irq_set_chip_data(lchip->irq, lchip);
204 irq_set_chained_handler(lchip->irq, locomo_handler);
205
206 /* Install handlers for IRQ_LOCOMO_* */
207 for ( ; irq <= lchip->irq_base + 3; irq++) {
208 irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
209 irq_set_chip_data(irq, lchip);
210 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
211 }
212 }
213
214
215 static void locomo_dev_release(struct device *_dev)
216 {
217 struct locomo_dev *dev = LOCOMO_DEV(_dev);
218
219 kfree(dev);
220 }
221
222 static int
223 locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
224 {
225 struct locomo_dev *dev;
226 int ret;
227
228 dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
229 if (!dev) {
230 ret = -ENOMEM;
231 goto out;
232 }
233
234 /*
235 * If the parent device has a DMA mask associated with it,
236 * propagate it down to the children.
237 */
238 if (lchip->dev->dma_mask) {
239 dev->dma_mask = *lchip->dev->dma_mask;
240 dev->dev.dma_mask = &dev->dma_mask;
241 }
242
243 dev_set_name(&dev->dev, "%s", info->name);
244 dev->devid = info->devid;
245 dev->dev.parent = lchip->dev;
246 dev->dev.bus = &locomo_bus_type;
247 dev->dev.release = locomo_dev_release;
248 dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
249
250 if (info->offset)
251 dev->mapbase = lchip->base + info->offset;
252 else
253 dev->mapbase = 0;
254 dev->length = info->length;
255
256 dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
257 NO_IRQ : lchip->irq_base + info->irq[0];
258
259 ret = device_register(&dev->dev);
260 if (ret) {
261 out:
262 kfree(dev);
263 }
264 return ret;
265 }
266
267 #ifdef CONFIG_PM
268
269 struct locomo_save_data {
270 u16 LCM_GPO;
271 u16 LCM_SPICT;
272 u16 LCM_GPE;
273 u16 LCM_ASD;
274 u16 LCM_SPIMD;
275 };
276
277 static int locomo_suspend(struct platform_device *dev, pm_message_t state)
278 {
279 struct locomo *lchip = platform_get_drvdata(dev);
280 struct locomo_save_data *save;
281 unsigned long flags;
282
283 save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
284 if (!save)
285 return -ENOMEM;
286
287 lchip->saved_state = save;
288
289 spin_lock_irqsave(&lchip->lock, flags);
290
291 save->LCM_GPO = locomo_readl(lchip->base + LOCOMO_GPO); /* GPIO */
292 locomo_writel(0x00, lchip->base + LOCOMO_GPO);
293 save->LCM_SPICT = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT); /* SPI */
294 locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
295 save->LCM_GPE = locomo_readl(lchip->base + LOCOMO_GPE); /* GPIO */
296 locomo_writel(0x00, lchip->base + LOCOMO_GPE);
297 save->LCM_ASD = locomo_readl(lchip->base + LOCOMO_ASD); /* ADSTART */
298 locomo_writel(0x00, lchip->base + LOCOMO_ASD);
299 save->LCM_SPIMD = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD); /* SPI */
300 locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
301
302 locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
303 locomo_writel(0x00, lchip->base + LOCOMO_DAC);
304 locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
305
306 if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
307 locomo_writel(0x00, lchip->base + LOCOMO_C32K); /* CLK32 off */
308 else
309 /* 18MHz already enabled, so no wait */
310 locomo_writel(0xc1, lchip->base + LOCOMO_C32K); /* CLK32 on */
311
312 locomo_writel(0x00, lchip->base + LOCOMO_TADC); /* 18MHz clock off*/
313 locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC); /* 22MHz/24MHz clock off */
314 locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS); /* FL */
315
316 spin_unlock_irqrestore(&lchip->lock, flags);
317
318 return 0;
319 }
320
321 static int locomo_resume(struct platform_device *dev)
322 {
323 struct locomo *lchip = platform_get_drvdata(dev);
324 struct locomo_save_data *save;
325 unsigned long r;
326 unsigned long flags;
327
328 save = lchip->saved_state;
329 if (!save)
330 return 0;
331
332 spin_lock_irqsave(&lchip->lock, flags);
333
334 locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
335 locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
336 locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
337 locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
338 locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
339
340 locomo_writel(0x00, lchip->base + LOCOMO_C32K);
341 locomo_writel(0x90, lchip->base + LOCOMO_TADC);
342
343 locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
344 r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
345 r &= 0xFEFF;
346 locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
347 locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
348
349 spin_unlock_irqrestore(&lchip->lock, flags);
350
351 lchip->saved_state = NULL;
352 kfree(save);
353
354 return 0;
355 }
356 #endif
357
358
359 /**
360 * locomo_probe - probe for a single LoCoMo chip.
361 * @phys_addr: physical address of device.
362 *
363 * Probe for a LoCoMo chip. This must be called
364 * before any other locomo-specific code.
365 *
366 * Returns:
367 * %-ENODEV device not found.
368 * %-EBUSY physical address already marked in-use.
369 * %0 successful.
370 */
371 static int
372 __locomo_probe(struct device *me, struct resource *mem, int irq)
373 {
374 struct locomo_platform_data *pdata = me->platform_data;
375 struct locomo *lchip;
376 unsigned long r;
377 int i, ret = -ENODEV;
378
379 lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
380 if (!lchip)
381 return -ENOMEM;
382
383 spin_lock_init(&lchip->lock);
384
385 lchip->dev = me;
386 dev_set_drvdata(lchip->dev, lchip);
387
388 lchip->phys = mem->start;
389 lchip->irq = irq;
390 lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
391
392 /*
393 * Map the whole region. This also maps the
394 * registers for our children.
395 */
396 lchip->base = ioremap(mem->start, PAGE_SIZE);
397 if (!lchip->base) {
398 ret = -ENOMEM;
399 goto out;
400 }
401
402 /* locomo initialize */
403 locomo_writel(0, lchip->base + LOCOMO_ICR);
404 /* KEYBOARD */
405 locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
406
407 /* GPIO */
408 locomo_writel(0, lchip->base + LOCOMO_GPO);
409 locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
410 , lchip->base + LOCOMO_GPE);
411 locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
412 , lchip->base + LOCOMO_GPD);
413 locomo_writel(0, lchip->base + LOCOMO_GIE);
414
415 /* Frontlight */
416 locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
417 locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
418
419 /* Longtime timer */
420 locomo_writel(0, lchip->base + LOCOMO_LTINT);
421 /* SPI */
422 locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
423
424 locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
425 r = locomo_readl(lchip->base + LOCOMO_ASD);
426 r |= 0x8000;
427 locomo_writel(r, lchip->base + LOCOMO_ASD);
428
429 locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
430 r = locomo_readl(lchip->base + LOCOMO_HSD);
431 r |= 0x8000;
432 locomo_writel(r, lchip->base + LOCOMO_HSD);
433
434 locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
435
436 /* XON */
437 locomo_writel(0x80, lchip->base + LOCOMO_TADC);
438 udelay(1000);
439 /* CLK9MEN */
440 r = locomo_readl(lchip->base + LOCOMO_TADC);
441 r |= 0x10;
442 locomo_writel(r, lchip->base + LOCOMO_TADC);
443 udelay(100);
444
445 /* init DAC */
446 r = locomo_readl(lchip->base + LOCOMO_DAC);
447 r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
448 locomo_writel(r, lchip->base + LOCOMO_DAC);
449
450 r = locomo_readl(lchip->base + LOCOMO_VER);
451 printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
452
453 /*
454 * The interrupt controller must be initialised before any
455 * other device to ensure that the interrupts are available.
456 */
457 if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
458 locomo_setup_irq(lchip);
459
460 for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
461 locomo_init_one_child(lchip, &locomo_devices[i]);
462 return 0;
463
464 out:
465 kfree(lchip);
466 return ret;
467 }
468
469 static int locomo_remove_child(struct device *dev, void *data)
470 {
471 device_unregister(dev);
472 return 0;
473 }
474
475 static void __locomo_remove(struct locomo *lchip)
476 {
477 device_for_each_child(lchip->dev, NULL, locomo_remove_child);
478
479 if (lchip->irq != NO_IRQ) {
480 irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
481 }
482
483 iounmap(lchip->base);
484 kfree(lchip);
485 }
486
487 static int locomo_probe(struct platform_device *dev)
488 {
489 struct resource *mem;
490 int irq;
491
492 mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
493 if (!mem)
494 return -EINVAL;
495 irq = platform_get_irq(dev, 0);
496 if (irq < 0)
497 return -ENXIO;
498
499 return __locomo_probe(&dev->dev, mem, irq);
500 }
501
502 static int locomo_remove(struct platform_device *dev)
503 {
504 struct locomo *lchip = platform_get_drvdata(dev);
505
506 if (lchip) {
507 __locomo_remove(lchip);
508 platform_set_drvdata(dev, NULL);
509 }
510
511 return 0;
512 }
513
514 /*
515 * Not sure if this should be on the system bus or not yet.
516 * We really want some way to register a system device at
517 * the per-machine level, and then have this driver pick
518 * up the registered devices.
519 */
520 static struct platform_driver locomo_device_driver = {
521 .probe = locomo_probe,
522 .remove = locomo_remove,
523 #ifdef CONFIG_PM
524 .suspend = locomo_suspend,
525 .resume = locomo_resume,
526 #endif
527 .driver = {
528 .name = "locomo",
529 },
530 };
531
532 /*
533 * Get the parent device driver (us) structure
534 * from a child function device
535 */
536 static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
537 {
538 return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
539 }
540
541 void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
542 {
543 struct locomo *lchip = dev_get_drvdata(dev);
544 unsigned long flags;
545 unsigned int r;
546
547 if (!lchip)
548 return;
549
550 spin_lock_irqsave(&lchip->lock, flags);
551
552 r = locomo_readl(lchip->base + LOCOMO_GPD);
553 if (dir)
554 r |= bits;
555 else
556 r &= ~bits;
557 locomo_writel(r, lchip->base + LOCOMO_GPD);
558
559 r = locomo_readl(lchip->base + LOCOMO_GPE);
560 if (dir)
561 r |= bits;
562 else
563 r &= ~bits;
564 locomo_writel(r, lchip->base + LOCOMO_GPE);
565
566 spin_unlock_irqrestore(&lchip->lock, flags);
567 }
568 EXPORT_SYMBOL(locomo_gpio_set_dir);
569
570 int locomo_gpio_read_level(struct device *dev, unsigned int bits)
571 {
572 struct locomo *lchip = dev_get_drvdata(dev);
573 unsigned long flags;
574 unsigned int ret;
575
576 if (!lchip)
577 return -ENODEV;
578
579 spin_lock_irqsave(&lchip->lock, flags);
580 ret = locomo_readl(lchip->base + LOCOMO_GPL);
581 spin_unlock_irqrestore(&lchip->lock, flags);
582
583 ret &= bits;
584 return ret;
585 }
586 EXPORT_SYMBOL(locomo_gpio_read_level);
587
588 int locomo_gpio_read_output(struct device *dev, unsigned int bits)
589 {
590 struct locomo *lchip = dev_get_drvdata(dev);
591 unsigned long flags;
592 unsigned int ret;
593
594 if (!lchip)
595 return -ENODEV;
596
597 spin_lock_irqsave(&lchip->lock, flags);
598 ret = locomo_readl(lchip->base + LOCOMO_GPO);
599 spin_unlock_irqrestore(&lchip->lock, flags);
600
601 ret &= bits;
602 return ret;
603 }
604 EXPORT_SYMBOL(locomo_gpio_read_output);
605
606 void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
607 {
608 struct locomo *lchip = dev_get_drvdata(dev);
609 unsigned long flags;
610 unsigned int r;
611
612 if (!lchip)
613 return;
614
615 spin_lock_irqsave(&lchip->lock, flags);
616
617 r = locomo_readl(lchip->base + LOCOMO_GPO);
618 if (set)
619 r |= bits;
620 else
621 r &= ~bits;
622 locomo_writel(r, lchip->base + LOCOMO_GPO);
623
624 spin_unlock_irqrestore(&lchip->lock, flags);
625 }
626 EXPORT_SYMBOL(locomo_gpio_write);
627
628 static void locomo_m62332_sendbit(void *mapbase, int bit)
629 {
630 unsigned int r;
631
632 r = locomo_readl(mapbase + LOCOMO_DAC);
633 r &= ~(LOCOMO_DAC_SCLOEB);
634 locomo_writel(r, mapbase + LOCOMO_DAC);
635 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
636 udelay(DAC_DATA_HOLD_TIME); /* 300 nsec */
637 r = locomo_readl(mapbase + LOCOMO_DAC);
638 r &= ~(LOCOMO_DAC_SCLOEB);
639 locomo_writel(r, mapbase + LOCOMO_DAC);
640 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
641 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
642
643 if (bit & 1) {
644 r = locomo_readl(mapbase + LOCOMO_DAC);
645 r |= LOCOMO_DAC_SDAOEB;
646 locomo_writel(r, mapbase + LOCOMO_DAC);
647 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
648 } else {
649 r = locomo_readl(mapbase + LOCOMO_DAC);
650 r &= ~(LOCOMO_DAC_SDAOEB);
651 locomo_writel(r, mapbase + LOCOMO_DAC);
652 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
653 }
654
655 udelay(DAC_DATA_SETUP_TIME); /* 250 nsec */
656 r = locomo_readl(mapbase + LOCOMO_DAC);
657 r |= LOCOMO_DAC_SCLOEB;
658 locomo_writel(r, mapbase + LOCOMO_DAC);
659 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
660 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
661 }
662
663 void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
664 {
665 struct locomo *lchip = locomo_chip_driver(ldev);
666 int i;
667 unsigned char data;
668 unsigned int r;
669 void *mapbase = lchip->base;
670 unsigned long flags;
671
672 spin_lock_irqsave(&lchip->lock, flags);
673
674 /* Start */
675 udelay(DAC_BUS_FREE_TIME); /* 5.0 usec */
676 r = locomo_readl(mapbase + LOCOMO_DAC);
677 r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
678 locomo_writel(r, mapbase + LOCOMO_DAC);
679 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
680 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
681 r = locomo_readl(mapbase + LOCOMO_DAC);
682 r &= ~(LOCOMO_DAC_SDAOEB);
683 locomo_writel(r, mapbase + LOCOMO_DAC);
684 udelay(DAC_START_HOLD_TIME); /* 5.0 usec */
685 udelay(DAC_DATA_HOLD_TIME); /* 300 nsec */
686
687 /* Send slave address and W bit (LSB is W bit) */
688 data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
689 for (i = 1; i <= 8; i++) {
690 locomo_m62332_sendbit(mapbase, data >> (8 - i));
691 }
692
693 /* Check A bit */
694 r = locomo_readl(mapbase + LOCOMO_DAC);
695 r &= ~(LOCOMO_DAC_SCLOEB);
696 locomo_writel(r, mapbase + LOCOMO_DAC);
697 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
698 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
699 r = locomo_readl(mapbase + LOCOMO_DAC);
700 r &= ~(LOCOMO_DAC_SDAOEB);
701 locomo_writel(r, mapbase + LOCOMO_DAC);
702 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
703 r = locomo_readl(mapbase + LOCOMO_DAC);
704 r |= LOCOMO_DAC_SCLOEB;
705 locomo_writel(r, mapbase + LOCOMO_DAC);
706 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
707 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
708 if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
709 printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
710 goto out;
711 }
712
713 /* Send Sub address (LSB is channel select) */
714 /* channel = 0 : ch1 select */
715 /* = 1 : ch2 select */
716 data = M62332_SUB_ADDR + channel;
717 for (i = 1; i <= 8; i++) {
718 locomo_m62332_sendbit(mapbase, data >> (8 - i));
719 }
720
721 /* Check A bit */
722 r = locomo_readl(mapbase + LOCOMO_DAC);
723 r &= ~(LOCOMO_DAC_SCLOEB);
724 locomo_writel(r, mapbase + LOCOMO_DAC);
725 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
726 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
727 r = locomo_readl(mapbase + LOCOMO_DAC);
728 r &= ~(LOCOMO_DAC_SDAOEB);
729 locomo_writel(r, mapbase + LOCOMO_DAC);
730 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
731 r = locomo_readl(mapbase + LOCOMO_DAC);
732 r |= LOCOMO_DAC_SCLOEB;
733 locomo_writel(r, mapbase + LOCOMO_DAC);
734 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
735 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
736 if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
737 printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
738 goto out;
739 }
740
741 /* Send DAC data */
742 for (i = 1; i <= 8; i++) {
743 locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
744 }
745
746 /* Check A bit */
747 r = locomo_readl(mapbase + LOCOMO_DAC);
748 r &= ~(LOCOMO_DAC_SCLOEB);
749 locomo_writel(r, mapbase + LOCOMO_DAC);
750 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
751 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
752 r = locomo_readl(mapbase + LOCOMO_DAC);
753 r &= ~(LOCOMO_DAC_SDAOEB);
754 locomo_writel(r, mapbase + LOCOMO_DAC);
755 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
756 r = locomo_readl(mapbase + LOCOMO_DAC);
757 r |= LOCOMO_DAC_SCLOEB;
758 locomo_writel(r, mapbase + LOCOMO_DAC);
759 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
760 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
761 if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
762 printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
763 }
764
765 out:
766 /* stop */
767 r = locomo_readl(mapbase + LOCOMO_DAC);
768 r &= ~(LOCOMO_DAC_SCLOEB);
769 locomo_writel(r, mapbase + LOCOMO_DAC);
770 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
771 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
772 r = locomo_readl(mapbase + LOCOMO_DAC);
773 r |= LOCOMO_DAC_SCLOEB;
774 locomo_writel(r, mapbase + LOCOMO_DAC);
775 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
776 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
777 r = locomo_readl(mapbase + LOCOMO_DAC);
778 r |= LOCOMO_DAC_SDAOEB;
779 locomo_writel(r, mapbase + LOCOMO_DAC);
780 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
781 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
782
783 r = locomo_readl(mapbase + LOCOMO_DAC);
784 r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
785 locomo_writel(r, mapbase + LOCOMO_DAC);
786 udelay(DAC_LOW_SETUP_TIME); /* 1000 nsec */
787 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
788
789 spin_unlock_irqrestore(&lchip->lock, flags);
790 }
791 EXPORT_SYMBOL(locomo_m62332_senddata);
792
793 /*
794 * Frontlight control
795 */
796
797 void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
798 {
799 unsigned long flags;
800 struct locomo *lchip = locomo_chip_driver(dev);
801
802 if (vr)
803 locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
804 else
805 locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
806
807 spin_lock_irqsave(&lchip->lock, flags);
808 locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
809 udelay(100);
810 locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
811 locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
812 spin_unlock_irqrestore(&lchip->lock, flags);
813 }
814 EXPORT_SYMBOL(locomo_frontlight_set);
815
816 /*
817 * LoCoMo "Register Access Bus."
818 *
819 * We model this as a regular bus type, and hang devices directly
820 * off this.
821 */
822 static int locomo_match(struct device *_dev, struct device_driver *_drv)
823 {
824 struct locomo_dev *dev = LOCOMO_DEV(_dev);
825 struct locomo_driver *drv = LOCOMO_DRV(_drv);
826
827 return dev->devid == drv->devid;
828 }
829
830 static int locomo_bus_suspend(struct device *dev, pm_message_t state)
831 {
832 struct locomo_dev *ldev = LOCOMO_DEV(dev);
833 struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
834 int ret = 0;
835
836 if (drv && drv->suspend)
837 ret = drv->suspend(ldev, state);
838 return ret;
839 }
840
841 static int locomo_bus_resume(struct device *dev)
842 {
843 struct locomo_dev *ldev = LOCOMO_DEV(dev);
844 struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
845 int ret = 0;
846
847 if (drv && drv->resume)
848 ret = drv->resume(ldev);
849 return ret;
850 }
851
852 static int locomo_bus_probe(struct device *dev)
853 {
854 struct locomo_dev *ldev = LOCOMO_DEV(dev);
855 struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
856 int ret = -ENODEV;
857
858 if (drv->probe)
859 ret = drv->probe(ldev);
860 return ret;
861 }
862
863 static int locomo_bus_remove(struct device *dev)
864 {
865 struct locomo_dev *ldev = LOCOMO_DEV(dev);
866 struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
867 int ret = 0;
868
869 if (drv->remove)
870 ret = drv->remove(ldev);
871 return ret;
872 }
873
874 struct bus_type locomo_bus_type = {
875 .name = "locomo-bus",
876 .match = locomo_match,
877 .probe = locomo_bus_probe,
878 .remove = locomo_bus_remove,
879 .suspend = locomo_bus_suspend,
880 .resume = locomo_bus_resume,
881 };
882
883 int locomo_driver_register(struct locomo_driver *driver)
884 {
885 driver->drv.bus = &locomo_bus_type;
886 return driver_register(&driver->drv);
887 }
888 EXPORT_SYMBOL(locomo_driver_register);
889
890 void locomo_driver_unregister(struct locomo_driver *driver)
891 {
892 driver_unregister(&driver->drv);
893 }
894 EXPORT_SYMBOL(locomo_driver_unregister);
895
896 static int __init locomo_init(void)
897 {
898 int ret = bus_register(&locomo_bus_type);
899 if (ret == 0)
900 platform_driver_register(&locomo_device_driver);
901 return ret;
902 }
903
904 static void __exit locomo_exit(void)
905 {
906 platform_driver_unregister(&locomo_device_driver);
907 bus_unregister(&locomo_bus_type);
908 }
909
910 module_init(locomo_init);
911 module_exit(locomo_exit);
912
913 MODULE_DESCRIPTION("Sharp LoCoMo core driver");
914 MODULE_LICENSE("GPL");
915 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
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