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