xref: /linux/arch/arm/common/locomo.c (revision d39d0ed196aa1685bb24771e92f78633c66ac9cb)
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 = get_irq_chip_data(irq);
144 	int req, i;
145 
146 	/* Acknowledge the parent IRQ */
147 	desc->chip->ack(irq);
148 
149 	/* check why this interrupt was generated */
150 	req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
151 
152 	if (req) {
153 		/* generate the next interrupt(s) */
154 		irq = lchip->irq_base;
155 		for (i = 0; i <= 3; i++, irq++) {
156 			if (req & (0x0100 << i)) {
157 				generic_handle_irq(irq);
158 			}
159 
160 		}
161 	}
162 }
163 
164 static void locomo_ack_irq(unsigned int irq)
165 {
166 }
167 
168 static void locomo_mask_irq(unsigned int irq)
169 {
170 	struct locomo *lchip = get_irq_chip_data(irq);
171 	unsigned int r;
172 	r = locomo_readl(lchip->base + LOCOMO_ICR);
173 	r &= ~(0x0010 << (irq - lchip->irq_base));
174 	locomo_writel(r, lchip->base + LOCOMO_ICR);
175 }
176 
177 static void locomo_unmask_irq(unsigned int irq)
178 {
179 	struct locomo *lchip = get_irq_chip_data(irq);
180 	unsigned int r;
181 	r = locomo_readl(lchip->base + LOCOMO_ICR);
182 	r |= (0x0010 << (irq - lchip->irq_base));
183 	locomo_writel(r, lchip->base + LOCOMO_ICR);
184 }
185 
186 static struct irq_chip locomo_chip = {
187 	.name	= "LOCOMO",
188 	.ack	= locomo_ack_irq,
189 	.mask	= locomo_mask_irq,
190 	.unmask	= locomo_unmask_irq,
191 };
192 
193 static void locomo_setup_irq(struct locomo *lchip)
194 {
195 	int irq = lchip->irq_base;
196 
197 	/*
198 	 * Install handler for IRQ_LOCOMO_HW.
199 	 */
200 	set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
201 	set_irq_chip_data(lchip->irq, lchip);
202 	set_irq_chained_handler(lchip->irq, locomo_handler);
203 
204 	/* Install handlers for IRQ_LOCOMO_* */
205 	for ( ; irq <= lchip->irq_base + 3; irq++) {
206 		set_irq_chip(irq, &locomo_chip);
207 		set_irq_chip_data(irq, lchip);
208 		set_irq_handler(irq, handle_level_irq);
209 		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
210 	}
211 }
212 
213 
214 static void locomo_dev_release(struct device *_dev)
215 {
216 	struct locomo_dev *dev = LOCOMO_DEV(_dev);
217 
218 	kfree(dev);
219 }
220 
221 static int
222 locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
223 {
224 	struct locomo_dev *dev;
225 	int ret;
226 
227 	dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
228 	if (!dev) {
229 		ret = -ENOMEM;
230 		goto out;
231 	}
232 
233 	/*
234 	 * If the parent device has a DMA mask associated with it,
235 	 * propagate it down to the children.
236 	 */
237 	if (lchip->dev->dma_mask) {
238 		dev->dma_mask = *lchip->dev->dma_mask;
239 		dev->dev.dma_mask = &dev->dma_mask;
240 	}
241 
242 	dev_set_name(&dev->dev, "%s", info->name);
243 	dev->devid	 = info->devid;
244 	dev->dev.parent  = lchip->dev;
245 	dev->dev.bus     = &locomo_bus_type;
246 	dev->dev.release = locomo_dev_release;
247 	dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
248 
249 	if (info->offset)
250 		dev->mapbase = lchip->base + info->offset;
251 	else
252 		dev->mapbase = 0;
253 	dev->length = info->length;
254 
255 	dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
256 			NO_IRQ : lchip->irq_base + info->irq[0];
257 
258 	ret = device_register(&dev->dev);
259 	if (ret) {
260  out:
261 		kfree(dev);
262 	}
263 	return ret;
264 }
265 
266 #ifdef CONFIG_PM
267 
268 struct locomo_save_data {
269 	u16	LCM_GPO;
270 	u16	LCM_SPICT;
271 	u16	LCM_GPE;
272 	u16	LCM_ASD;
273 	u16	LCM_SPIMD;
274 };
275 
276 static int locomo_suspend(struct platform_device *dev, pm_message_t state)
277 {
278 	struct locomo *lchip = platform_get_drvdata(dev);
279 	struct locomo_save_data *save;
280 	unsigned long flags;
281 
282 	save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
283 	if (!save)
284 		return -ENOMEM;
285 
286 	lchip->saved_state = save;
287 
288 	spin_lock_irqsave(&lchip->lock, flags);
289 
290 	save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);	/* GPIO */
291 	locomo_writel(0x00, lchip->base + LOCOMO_GPO);
292 	save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);	/* SPI */
293 	locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
294 	save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);	/* GPIO */
295 	locomo_writel(0x00, lchip->base + LOCOMO_GPE);
296 	save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);	/* ADSTART */
297 	locomo_writel(0x00, lchip->base + LOCOMO_ASD);
298 	save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);	/* SPI */
299 	locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
300 
301 	locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
302 	locomo_writel(0x00, lchip->base + LOCOMO_DAC);
303 	locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
304 
305 	if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
306 		locomo_writel(0x00, lchip->base + LOCOMO_C32K); 	/* CLK32 off */
307 	else
308 		/* 18MHz already enabled, so no wait */
309 		locomo_writel(0xc1, lchip->base + LOCOMO_C32K); 	/* CLK32 on */
310 
311 	locomo_writel(0x00, lchip->base + LOCOMO_TADC);		/* 18MHz clock off*/
312 	locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);			/* 22MHz/24MHz clock off */
313 	locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);			/* FL */
314 
315 	spin_unlock_irqrestore(&lchip->lock, flags);
316 
317 	return 0;
318 }
319 
320 static int locomo_resume(struct platform_device *dev)
321 {
322 	struct locomo *lchip = platform_get_drvdata(dev);
323 	struct locomo_save_data *save;
324 	unsigned long r;
325 	unsigned long flags;
326 
327 	save = lchip->saved_state;
328 	if (!save)
329 		return 0;
330 
331 	spin_lock_irqsave(&lchip->lock, flags);
332 
333 	locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
334 	locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
335 	locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
336 	locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
337 	locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
338 
339 	locomo_writel(0x00, lchip->base + LOCOMO_C32K);
340 	locomo_writel(0x90, lchip->base + LOCOMO_TADC);
341 
342 	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
343 	r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
344 	r &= 0xFEFF;
345 	locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
346 	locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
347 
348 	spin_unlock_irqrestore(&lchip->lock, flags);
349 
350 	lchip->saved_state = NULL;
351 	kfree(save);
352 
353 	return 0;
354 }
355 #endif
356 
357 
358 /**
359  *	locomo_probe - probe for a single LoCoMo chip.
360  *	@phys_addr: physical address of device.
361  *
362  *	Probe for a LoCoMo chip.  This must be called
363  *	before any other locomo-specific code.
364  *
365  *	Returns:
366  *	%-ENODEV	device not found.
367  *	%-EBUSY		physical address already marked in-use.
368  *	%0		successful.
369  */
370 static int
371 __locomo_probe(struct device *me, struct resource *mem, int irq)
372 {
373 	struct locomo_platform_data *pdata = me->platform_data;
374 	struct locomo *lchip;
375 	unsigned long r;
376 	int i, ret = -ENODEV;
377 
378 	lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
379 	if (!lchip)
380 		return -ENOMEM;
381 
382 	spin_lock_init(&lchip->lock);
383 
384 	lchip->dev = me;
385 	dev_set_drvdata(lchip->dev, lchip);
386 
387 	lchip->phys = mem->start;
388 	lchip->irq = irq;
389 	lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
390 
391 	/*
392 	 * Map the whole region.  This also maps the
393 	 * registers for our children.
394 	 */
395 	lchip->base = ioremap(mem->start, PAGE_SIZE);
396 	if (!lchip->base) {
397 		ret = -ENOMEM;
398 		goto out;
399 	}
400 
401 	/* locomo initialize */
402 	locomo_writel(0, lchip->base + LOCOMO_ICR);
403 	/* KEYBOARD */
404 	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
405 
406 	/* GPIO */
407 	locomo_writel(0, lchip->base + LOCOMO_GPO);
408 	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
409 			, lchip->base + LOCOMO_GPE);
410 	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
411 			, lchip->base + LOCOMO_GPD);
412 	locomo_writel(0, lchip->base + LOCOMO_GIE);
413 
414 	/* Frontlight */
415 	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
416 	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
417 
418 	/* Longtime timer */
419 	locomo_writel(0, lchip->base + LOCOMO_LTINT);
420 	/* SPI */
421 	locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
422 
423 	locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
424 	r = locomo_readl(lchip->base + LOCOMO_ASD);
425 	r |= 0x8000;
426 	locomo_writel(r, lchip->base + LOCOMO_ASD);
427 
428 	locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
429 	r = locomo_readl(lchip->base + LOCOMO_HSD);
430 	r |= 0x8000;
431 	locomo_writel(r, lchip->base + LOCOMO_HSD);
432 
433 	locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
434 
435 	/* XON */
436 	locomo_writel(0x80, lchip->base + LOCOMO_TADC);
437 	udelay(1000);
438 	/* CLK9MEN */
439 	r = locomo_readl(lchip->base + LOCOMO_TADC);
440 	r |= 0x10;
441 	locomo_writel(r, lchip->base + LOCOMO_TADC);
442 	udelay(100);
443 
444 	/* init DAC */
445 	r = locomo_readl(lchip->base + LOCOMO_DAC);
446 	r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
447 	locomo_writel(r, lchip->base + LOCOMO_DAC);
448 
449 	r = locomo_readl(lchip->base + LOCOMO_VER);
450 	printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
451 
452 	/*
453 	 * The interrupt controller must be initialised before any
454 	 * other device to ensure that the interrupts are available.
455 	 */
456 	if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
457 		locomo_setup_irq(lchip);
458 
459 	for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
460 		locomo_init_one_child(lchip, &locomo_devices[i]);
461 	return 0;
462 
463  out:
464 	kfree(lchip);
465 	return ret;
466 }
467 
468 static int locomo_remove_child(struct device *dev, void *data)
469 {
470 	device_unregister(dev);
471 	return 0;
472 }
473 
474 static void __locomo_remove(struct locomo *lchip)
475 {
476 	device_for_each_child(lchip->dev, NULL, locomo_remove_child);
477 
478 	if (lchip->irq != NO_IRQ) {
479 		set_irq_chained_handler(lchip->irq, NULL);
480 		set_irq_data(lchip->irq, 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>");
916