xref: /linux/arch/arm/common/locomo.c (revision e70140ba0d2b1a30467d4af6bcfe761327b9ec95)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/arch/arm/common/locomo.c
4  *
5  * Sharp LoCoMo support
6  *
7  * This file contains all generic LoCoMo support.
8  *
9  * All initialization functions provided here are intended to be called
10  * from machine specific code with proper arguments when required.
11  *
12  * Based on sa1111.c
13  */
14 
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/errno.h>
20 #include <linux/ioport.h>
21 #include <linux/platform_device.h>
22 #include <linux/slab.h>
23 #include <linux/spinlock.h>
24 #include <linux/io.h>
25 
26 #include <asm/irq.h>
27 #include <asm/mach/irq.h>
28 
29 #include <asm/hardware/locomo.h>
30 
31 /* LoCoMo Interrupts */
32 #define IRQ_LOCOMO_KEY		(0)
33 #define IRQ_LOCOMO_GPIO		(1)
34 #define IRQ_LOCOMO_LT		(2)
35 #define IRQ_LOCOMO_SPI		(3)
36 
37 /* M62332 output channel selection */
38 #define M62332_EVR_CH	1	/* M62332 volume channel number  */
39 				/*   0 : CH.1 , 1 : CH. 2        */
40 /* DAC send data */
41 #define	M62332_SLAVE_ADDR	0x4e	/* Slave address  */
42 #define	M62332_W_BIT		0x00	/* W bit (0 only) */
43 #define	M62332_SUB_ADDR		0x00	/* Sub address    */
44 #define	M62332_A_BIT		0x00	/* A bit (0 only) */
45 
46 /* DAC setup and hold times (expressed in us) */
47 #define DAC_BUS_FREE_TIME	5	/*   4.7 us */
48 #define DAC_START_SETUP_TIME	5	/*   4.7 us */
49 #define DAC_STOP_SETUP_TIME	4	/*   4.0 us */
50 #define DAC_START_HOLD_TIME	5	/*   4.7 us */
51 #define DAC_SCL_LOW_HOLD_TIME	5	/*   4.7 us */
52 #define DAC_SCL_HIGH_HOLD_TIME	4	/*   4.0 us */
53 #define DAC_DATA_SETUP_TIME	1	/*   250 ns */
54 #define DAC_DATA_HOLD_TIME	1	/*   300 ns */
55 #define DAC_LOW_SETUP_TIME	1	/*   300 ns */
56 #define DAC_HIGH_SETUP_TIME	1	/*  1000 ns */
57 
58 /* the following is the overall data for the locomo chip */
59 struct locomo {
60 	struct device *dev;
61 	unsigned long phys;
62 	unsigned int irq;
63 	int irq_base;
64 	spinlock_t lock;
65 	void __iomem *base;
66 #ifdef CONFIG_PM
67 	void *saved_state;
68 #endif
69 };
70 
71 static const struct bus_type locomo_bus_type;
72 
73 struct locomo_dev_info {
74 	unsigned long	offset;
75 	unsigned long	length;
76 	unsigned int	devid;
77 	unsigned int	irq[1];
78 	const char *	name;
79 };
80 
81 /* All the locomo devices.  If offset is non-zero, the mapbase for the
82  * locomo_dev will be set to the chip base plus offset.  If offset is
83  * zero, then the mapbase for the locomo_dev will be set to zero.  An
84  * offset of zero means the device only uses GPIOs or other helper
85  * functions inside this file */
86 static struct locomo_dev_info locomo_devices[] = {
87 	{
88 		.devid 		= LOCOMO_DEVID_KEYBOARD,
89 		.irq		= { IRQ_LOCOMO_KEY },
90 		.name		= "locomo-keyboard",
91 		.offset		= LOCOMO_KEYBOARD,
92 		.length		= 16,
93 	},
94 	{
95 		.devid		= LOCOMO_DEVID_FRONTLIGHT,
96 		.irq		= {},
97 		.name		= "locomo-frontlight",
98 		.offset		= LOCOMO_FRONTLIGHT,
99 		.length		= 8,
100 
101 	},
102 	{
103 		.devid		= LOCOMO_DEVID_BACKLIGHT,
104 		.irq		= {},
105 		.name		= "locomo-backlight",
106 		.offset		= LOCOMO_BACKLIGHT,
107 		.length		= 8,
108 	},
109 	{
110 		.devid		= LOCOMO_DEVID_AUDIO,
111 		.irq		= {},
112 		.name		= "locomo-audio",
113 		.offset		= LOCOMO_AUDIO,
114 		.length		= 4,
115 	},
116 	{
117 		.devid		= LOCOMO_DEVID_LED,
118 		.irq 		= {},
119 		.name		= "locomo-led",
120 		.offset		= LOCOMO_LED,
121 		.length		= 8,
122 	},
123 	{
124 		.devid		= LOCOMO_DEVID_UART,
125 		.irq		= {},
126 		.name		= "locomo-uart",
127 		.offset		= 0,
128 		.length		= 0,
129 	},
130 	{
131 		.devid		= LOCOMO_DEVID_SPI,
132 		.irq		= {},
133 		.name		= "locomo-spi",
134 		.offset		= LOCOMO_SPI,
135 		.length		= 0x30,
136 	},
137 };
138 
locomo_handler(struct irq_desc * desc)139 static void locomo_handler(struct irq_desc *desc)
140 {
141 	struct locomo *lchip = irq_desc_get_handler_data(desc);
142 	int req, i;
143 
144 	/* Acknowledge the parent IRQ */
145 	desc->irq_data.chip->irq_ack(&desc->irq_data);
146 
147 	/* check why this interrupt was generated */
148 	req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
149 
150 	if (req) {
151 		unsigned int irq;
152 
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_chained_handler_and_data(lchip->irq, locomo_handler, lchip);
202 
203 	/* Install handlers for IRQ_LOCOMO_* */
204 	for ( ; irq <= lchip->irq_base + 3; irq++) {
205 		irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
206 		irq_set_chip_data(irq, lchip);
207 		irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
208 	}
209 }
210 
211 
locomo_dev_release(struct device * _dev)212 static void locomo_dev_release(struct device *_dev)
213 {
214 	struct locomo_dev *dev = LOCOMO_DEV(_dev);
215 
216 	kfree(dev);
217 }
218 
219 static int
locomo_init_one_child(struct locomo * lchip,struct locomo_dev_info * info)220 locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
221 {
222 	struct locomo_dev *dev;
223 	int ret;
224 
225 	dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
226 	if (!dev) {
227 		ret = -ENOMEM;
228 		goto out;
229 	}
230 
231 	/*
232 	 * If the parent device has a DMA mask associated with it,
233 	 * propagate it down to the children.
234 	 */
235 	if (lchip->dev->dma_mask) {
236 		dev->dma_mask = *lchip->dev->dma_mask;
237 		dev->dev.dma_mask = &dev->dma_mask;
238 	}
239 
240 	dev_set_name(&dev->dev, "%s", info->name);
241 	dev->devid	 = info->devid;
242 	dev->dev.parent  = lchip->dev;
243 	dev->dev.bus     = &locomo_bus_type;
244 	dev->dev.release = locomo_dev_release;
245 	dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
246 
247 	if (info->offset)
248 		dev->mapbase = lchip->base + info->offset;
249 	else
250 		dev->mapbase = 0;
251 	dev->length = info->length;
252 
253 	dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
254 			NO_IRQ : lchip->irq_base + info->irq[0];
255 
256 	ret = device_register(&dev->dev);
257 	if (ret) {
258  out:
259 		kfree(dev);
260 	}
261 	return ret;
262 }
263 
264 #ifdef CONFIG_PM
265 
266 struct locomo_save_data {
267 	u16	LCM_GPO;
268 	u16	LCM_SPICT;
269 	u16	LCM_GPE;
270 	u16	LCM_ASD;
271 	u16	LCM_SPIMD;
272 };
273 
locomo_suspend(struct platform_device * dev,pm_message_t state)274 static int locomo_suspend(struct platform_device *dev, pm_message_t state)
275 {
276 	struct locomo *lchip = platform_get_drvdata(dev);
277 	struct locomo_save_data *save;
278 	unsigned long flags;
279 
280 	save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
281 	if (!save)
282 		return -ENOMEM;
283 
284 	lchip->saved_state = save;
285 
286 	spin_lock_irqsave(&lchip->lock, flags);
287 
288 	save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);	/* GPIO */
289 	locomo_writel(0x00, lchip->base + LOCOMO_GPO);
290 	save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);	/* SPI */
291 	locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
292 	save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);	/* GPIO */
293 	locomo_writel(0x00, lchip->base + LOCOMO_GPE);
294 	save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);	/* ADSTART */
295 	locomo_writel(0x00, lchip->base + LOCOMO_ASD);
296 	save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);	/* SPI */
297 	locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
298 
299 	locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
300 	locomo_writel(0x00, lchip->base + LOCOMO_DAC);
301 	locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
302 
303 	if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
304 		locomo_writel(0x00, lchip->base + LOCOMO_C32K); 	/* CLK32 off */
305 	else
306 		/* 18MHz already enabled, so no wait */
307 		locomo_writel(0xc1, lchip->base + LOCOMO_C32K); 	/* CLK32 on */
308 
309 	locomo_writel(0x00, lchip->base + LOCOMO_TADC);		/* 18MHz clock off*/
310 	locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);			/* 22MHz/24MHz clock off */
311 	locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);			/* FL */
312 
313 	spin_unlock_irqrestore(&lchip->lock, flags);
314 
315 	return 0;
316 }
317 
locomo_resume(struct platform_device * dev)318 static int locomo_resume(struct platform_device *dev)
319 {
320 	struct locomo *lchip = platform_get_drvdata(dev);
321 	struct locomo_save_data *save;
322 	unsigned long r;
323 	unsigned long flags;
324 
325 	save = lchip->saved_state;
326 	if (!save)
327 		return 0;
328 
329 	spin_lock_irqsave(&lchip->lock, flags);
330 
331 	locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
332 	locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
333 	locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
334 	locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
335 	locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
336 
337 	locomo_writel(0x00, lchip->base + LOCOMO_C32K);
338 	locomo_writel(0x90, lchip->base + LOCOMO_TADC);
339 
340 	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
341 	r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
342 	r &= 0xFEFF;
343 	locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
344 	locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
345 
346 	spin_unlock_irqrestore(&lchip->lock, flags);
347 
348 	lchip->saved_state = NULL;
349 	kfree(save);
350 
351 	return 0;
352 }
353 #endif
354 
355 static int
__locomo_probe(struct device * me,struct resource * mem,int irq)356 __locomo_probe(struct device *me, struct resource *mem, int irq)
357 {
358 	struct locomo_platform_data *pdata = me->platform_data;
359 	struct locomo *lchip;
360 	unsigned long r;
361 	int i, ret = -ENODEV;
362 
363 	lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
364 	if (!lchip)
365 		return -ENOMEM;
366 
367 	spin_lock_init(&lchip->lock);
368 
369 	lchip->dev = me;
370 	dev_set_drvdata(lchip->dev, lchip);
371 
372 	lchip->phys = mem->start;
373 	lchip->irq = irq;
374 	lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
375 
376 	/*
377 	 * Map the whole region.  This also maps the
378 	 * registers for our children.
379 	 */
380 	lchip->base = ioremap(mem->start, PAGE_SIZE);
381 	if (!lchip->base) {
382 		ret = -ENOMEM;
383 		goto out;
384 	}
385 
386 	/* locomo initialize */
387 	locomo_writel(0, lchip->base + LOCOMO_ICR);
388 	/* KEYBOARD */
389 	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
390 
391 	/* GPIO */
392 	locomo_writel(0, lchip->base + LOCOMO_GPO);
393 	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
394 			, lchip->base + LOCOMO_GPE);
395 	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
396 			, lchip->base + LOCOMO_GPD);
397 	locomo_writel(0, lchip->base + LOCOMO_GIE);
398 
399 	/* Frontlight */
400 	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
401 	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
402 
403 	/* Longtime timer */
404 	locomo_writel(0, lchip->base + LOCOMO_LTINT);
405 	/* SPI */
406 	locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
407 
408 	locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
409 	r = locomo_readl(lchip->base + LOCOMO_ASD);
410 	r |= 0x8000;
411 	locomo_writel(r, lchip->base + LOCOMO_ASD);
412 
413 	locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
414 	r = locomo_readl(lchip->base + LOCOMO_HSD);
415 	r |= 0x8000;
416 	locomo_writel(r, lchip->base + LOCOMO_HSD);
417 
418 	locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
419 
420 	/* XON */
421 	locomo_writel(0x80, lchip->base + LOCOMO_TADC);
422 	udelay(1000);
423 	/* CLK9MEN */
424 	r = locomo_readl(lchip->base + LOCOMO_TADC);
425 	r |= 0x10;
426 	locomo_writel(r, lchip->base + LOCOMO_TADC);
427 	udelay(100);
428 
429 	/* init DAC */
430 	r = locomo_readl(lchip->base + LOCOMO_DAC);
431 	r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
432 	locomo_writel(r, lchip->base + LOCOMO_DAC);
433 
434 	r = locomo_readl(lchip->base + LOCOMO_VER);
435 	printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
436 
437 	/*
438 	 * The interrupt controller must be initialised before any
439 	 * other device to ensure that the interrupts are available.
440 	 */
441 	if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
442 		locomo_setup_irq(lchip);
443 
444 	for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
445 		locomo_init_one_child(lchip, &locomo_devices[i]);
446 	return 0;
447 
448  out:
449 	kfree(lchip);
450 	return ret;
451 }
452 
locomo_remove_child(struct device * dev,void * data)453 static int locomo_remove_child(struct device *dev, void *data)
454 {
455 	device_unregister(dev);
456 	return 0;
457 }
458 
__locomo_remove(struct locomo * lchip)459 static void __locomo_remove(struct locomo *lchip)
460 {
461 	device_for_each_child(lchip->dev, NULL, locomo_remove_child);
462 
463 	if (lchip->irq != NO_IRQ) {
464 		irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
465 	}
466 
467 	iounmap(lchip->base);
468 	kfree(lchip);
469 }
470 
471 /**
472  *	locomo_probe - probe for a single LoCoMo chip.
473  *	@dev: platform device
474  *
475  *	Probe for a LoCoMo chip.  This must be called
476  *	before any other locomo-specific code.
477  *
478  *	Returns:
479  *	* %-EINVAL	- device's IORESOURCE_MEM not found
480  *	* %-ENXIO	- could not allocate an IRQ for the device
481  *	* %-ENODEV	- device not found.
482  *	* %-EBUSY	- physical address already marked in-use.
483  *	* %-ENOMEM	- could not allocate or iomap memory.
484  *	* %0		- successful.
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 void 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 
511 /*
512  *	Not sure if this should be on the system bus or not yet.
513  *	We really want some way to register a system device at
514  *	the per-machine level, and then have this driver pick
515  *	up the registered devices.
516  */
517 static struct platform_driver locomo_device_driver = {
518 	.probe		= locomo_probe,
519 	.remove		= locomo_remove,
520 #ifdef CONFIG_PM
521 	.suspend	= locomo_suspend,
522 	.resume		= locomo_resume,
523 #endif
524 	.driver		= {
525 		.name	= "locomo",
526 	},
527 };
528 
529 /*
530  *	Get the parent device driver (us) structure
531  *	from a child function device
532  */
locomo_chip_driver(struct locomo_dev * ldev)533 static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
534 {
535 	return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
536 }
537 
locomo_gpio_set_dir(struct device * dev,unsigned int bits,unsigned int dir)538 void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
539 {
540 	struct locomo *lchip = dev_get_drvdata(dev);
541 	unsigned long flags;
542 	unsigned int r;
543 
544 	if (!lchip)
545 		return;
546 
547 	spin_lock_irqsave(&lchip->lock, flags);
548 
549 	r = locomo_readl(lchip->base + LOCOMO_GPD);
550 	if (dir)
551 		r |= bits;
552 	else
553 		r &= ~bits;
554 	locomo_writel(r, lchip->base + LOCOMO_GPD);
555 
556 	r = locomo_readl(lchip->base + LOCOMO_GPE);
557 	if (dir)
558 		r |= bits;
559 	else
560 		r &= ~bits;
561 	locomo_writel(r, lchip->base + LOCOMO_GPE);
562 
563 	spin_unlock_irqrestore(&lchip->lock, flags);
564 }
565 EXPORT_SYMBOL(locomo_gpio_set_dir);
566 
locomo_gpio_read_level(struct device * dev,unsigned int bits)567 int locomo_gpio_read_level(struct device *dev, unsigned int bits)
568 {
569 	struct locomo *lchip = dev_get_drvdata(dev);
570 	unsigned long flags;
571 	unsigned int ret;
572 
573 	if (!lchip)
574 		return -ENODEV;
575 
576 	spin_lock_irqsave(&lchip->lock, flags);
577 	ret = locomo_readl(lchip->base + LOCOMO_GPL);
578 	spin_unlock_irqrestore(&lchip->lock, flags);
579 
580 	ret &= bits;
581 	return ret;
582 }
583 EXPORT_SYMBOL(locomo_gpio_read_level);
584 
locomo_gpio_read_output(struct device * dev,unsigned int bits)585 int locomo_gpio_read_output(struct device *dev, unsigned int bits)
586 {
587 	struct locomo *lchip = dev_get_drvdata(dev);
588 	unsigned long flags;
589 	unsigned int ret;
590 
591 	if (!lchip)
592 		return -ENODEV;
593 
594 	spin_lock_irqsave(&lchip->lock, flags);
595 	ret = locomo_readl(lchip->base + LOCOMO_GPO);
596 	spin_unlock_irqrestore(&lchip->lock, flags);
597 
598 	ret &= bits;
599 	return ret;
600 }
601 EXPORT_SYMBOL(locomo_gpio_read_output);
602 
locomo_gpio_write(struct device * dev,unsigned int bits,unsigned int set)603 void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
604 {
605 	struct locomo *lchip = dev_get_drvdata(dev);
606 	unsigned long flags;
607 	unsigned int r;
608 
609 	if (!lchip)
610 		return;
611 
612 	spin_lock_irqsave(&lchip->lock, flags);
613 
614 	r = locomo_readl(lchip->base + LOCOMO_GPO);
615 	if (set)
616 		r |= bits;
617 	else
618 		r &= ~bits;
619 	locomo_writel(r, lchip->base + LOCOMO_GPO);
620 
621 	spin_unlock_irqrestore(&lchip->lock, flags);
622 }
623 EXPORT_SYMBOL(locomo_gpio_write);
624 
locomo_m62332_sendbit(void * mapbase,int bit)625 static void locomo_m62332_sendbit(void *mapbase, int bit)
626 {
627 	unsigned int r;
628 
629 	r = locomo_readl(mapbase + LOCOMO_DAC);
630 	r &=  ~(LOCOMO_DAC_SCLOEB);
631 	locomo_writel(r, mapbase + LOCOMO_DAC);
632 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
633 	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */
634 	r = locomo_readl(mapbase + LOCOMO_DAC);
635 	r &=  ~(LOCOMO_DAC_SCLOEB);
636 	locomo_writel(r, mapbase + LOCOMO_DAC);
637 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
638 	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
639 
640 	if (bit & 1) {
641 		r = locomo_readl(mapbase + LOCOMO_DAC);
642 		r |=  LOCOMO_DAC_SDAOEB;
643 		locomo_writel(r, mapbase + LOCOMO_DAC);
644 		udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
645 	} else {
646 		r = locomo_readl(mapbase + LOCOMO_DAC);
647 		r &=  ~(LOCOMO_DAC_SDAOEB);
648 		locomo_writel(r, mapbase + LOCOMO_DAC);
649 		udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
650 	}
651 
652 	udelay(DAC_DATA_SETUP_TIME);	/* 250 nsec */
653 	r = locomo_readl(mapbase + LOCOMO_DAC);
654 	r |=  LOCOMO_DAC_SCLOEB;
655 	locomo_writel(r, mapbase + LOCOMO_DAC);
656 	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
657 	udelay(DAC_SCL_HIGH_HOLD_TIME);	/*  4.0 usec */
658 }
659 
locomo_m62332_senddata(struct locomo_dev * ldev,unsigned int dac_data,int channel)660 void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
661 {
662 	struct locomo *lchip = locomo_chip_driver(ldev);
663 	int i;
664 	unsigned char data;
665 	unsigned int r;
666 	void *mapbase = lchip->base;
667 	unsigned long flags;
668 
669 	spin_lock_irqsave(&lchip->lock, flags);
670 
671 	/* Start */
672 	udelay(DAC_BUS_FREE_TIME);	/* 5.0 usec */
673 	r = locomo_readl(mapbase + LOCOMO_DAC);
674 	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
675 	locomo_writel(r, mapbase + LOCOMO_DAC);
676 	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
677 	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.0 usec */
678 	r = locomo_readl(mapbase + LOCOMO_DAC);
679 	r &=  ~(LOCOMO_DAC_SDAOEB);
680 	locomo_writel(r, mapbase + LOCOMO_DAC);
681 	udelay(DAC_START_HOLD_TIME);	/* 5.0 usec */
682 	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */
683 
684 	/* Send slave address and W bit (LSB is W bit) */
685 	data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
686 	for (i = 1; i <= 8; i++) {
687 		locomo_m62332_sendbit(mapbase, data >> (8 - i));
688 	}
689 
690 	/* Check A bit */
691 	r = locomo_readl(mapbase + LOCOMO_DAC);
692 	r &=  ~(LOCOMO_DAC_SCLOEB);
693 	locomo_writel(r, mapbase + LOCOMO_DAC);
694 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
695 	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
696 	r = locomo_readl(mapbase + LOCOMO_DAC);
697 	r &=  ~(LOCOMO_DAC_SDAOEB);
698 	locomo_writel(r, mapbase + LOCOMO_DAC);
699 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
700 	r = locomo_readl(mapbase + LOCOMO_DAC);
701 	r |=  LOCOMO_DAC_SCLOEB;
702 	locomo_writel(r, mapbase + LOCOMO_DAC);
703 	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
704 	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
705 	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
706 		printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
707 		goto out;
708 	}
709 
710 	/* Send Sub address (LSB is channel select) */
711 	/*    channel = 0 : ch1 select              */
712 	/*            = 1 : ch2 select              */
713 	data = M62332_SUB_ADDR + channel;
714 	for (i = 1; i <= 8; i++) {
715 		locomo_m62332_sendbit(mapbase, data >> (8 - i));
716 	}
717 
718 	/* Check A bit */
719 	r = locomo_readl(mapbase + LOCOMO_DAC);
720 	r &=  ~(LOCOMO_DAC_SCLOEB);
721 	locomo_writel(r, mapbase + LOCOMO_DAC);
722 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
723 	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
724 	r = locomo_readl(mapbase + LOCOMO_DAC);
725 	r &=  ~(LOCOMO_DAC_SDAOEB);
726 	locomo_writel(r, mapbase + LOCOMO_DAC);
727 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
728 	r = locomo_readl(mapbase + LOCOMO_DAC);
729 	r |=  LOCOMO_DAC_SCLOEB;
730 	locomo_writel(r, mapbase + LOCOMO_DAC);
731 	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
732 	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
733 	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
734 		printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
735 		goto out;
736 	}
737 
738 	/* Send DAC data */
739 	for (i = 1; i <= 8; i++) {
740 		locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
741 	}
742 
743 	/* Check A bit */
744 	r = locomo_readl(mapbase + LOCOMO_DAC);
745 	r &=  ~(LOCOMO_DAC_SCLOEB);
746 	locomo_writel(r, mapbase + LOCOMO_DAC);
747 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
748 	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
749 	r = locomo_readl(mapbase + LOCOMO_DAC);
750 	r &=  ~(LOCOMO_DAC_SDAOEB);
751 	locomo_writel(r, mapbase + LOCOMO_DAC);
752 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
753 	r = locomo_readl(mapbase + LOCOMO_DAC);
754 	r |=  LOCOMO_DAC_SCLOEB;
755 	locomo_writel(r, mapbase + LOCOMO_DAC);
756 	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
757 	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
758 	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
759 		printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
760 	}
761 
762 out:
763 	/* stop */
764 	r = locomo_readl(mapbase + LOCOMO_DAC);
765 	r &=  ~(LOCOMO_DAC_SCLOEB);
766 	locomo_writel(r, mapbase + LOCOMO_DAC);
767 	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
768 	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
769 	r = locomo_readl(mapbase + LOCOMO_DAC);
770 	r |=  LOCOMO_DAC_SCLOEB;
771 	locomo_writel(r, mapbase + LOCOMO_DAC);
772 	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
773 	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
774 	r = locomo_readl(mapbase + LOCOMO_DAC);
775 	r |=  LOCOMO_DAC_SDAOEB;
776 	locomo_writel(r, mapbase + LOCOMO_DAC);
777 	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
778 	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
779 
780 	r = locomo_readl(mapbase + LOCOMO_DAC);
781 	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
782 	locomo_writel(r, mapbase + LOCOMO_DAC);
783 	udelay(DAC_LOW_SETUP_TIME);	/* 1000 nsec */
784 	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
785 
786 	spin_unlock_irqrestore(&lchip->lock, flags);
787 }
788 EXPORT_SYMBOL(locomo_m62332_senddata);
789 
790 /*
791  *	Frontlight control
792  */
793 
locomo_frontlight_set(struct locomo_dev * dev,int duty,int vr,int bpwf)794 void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
795 {
796 	unsigned long flags;
797 	struct locomo *lchip = locomo_chip_driver(dev);
798 
799 	if (vr)
800 		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
801 	else
802 		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
803 
804 	spin_lock_irqsave(&lchip->lock, flags);
805 	locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
806 	udelay(100);
807 	locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
808 	locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
809 	spin_unlock_irqrestore(&lchip->lock, flags);
810 }
811 EXPORT_SYMBOL(locomo_frontlight_set);
812 
813 /*
814  *	LoCoMo "Register Access Bus."
815  *
816  *	We model this as a regular bus type, and hang devices directly
817  *	off this.
818  */
locomo_match(struct device * _dev,const struct device_driver * _drv)819 static int locomo_match(struct device *_dev, const struct device_driver *_drv)
820 {
821 	struct locomo_dev *dev = LOCOMO_DEV(_dev);
822 	const struct locomo_driver *drv = LOCOMO_DRV(_drv);
823 
824 	return dev->devid == drv->devid;
825 }
826 
locomo_bus_probe(struct device * dev)827 static int locomo_bus_probe(struct device *dev)
828 {
829 	struct locomo_dev *ldev = LOCOMO_DEV(dev);
830 	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
831 	int ret = -ENODEV;
832 
833 	if (drv->probe)
834 		ret = drv->probe(ldev);
835 	return ret;
836 }
837 
locomo_bus_remove(struct device * dev)838 static void locomo_bus_remove(struct device *dev)
839 {
840 	struct locomo_dev *ldev = LOCOMO_DEV(dev);
841 	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
842 
843 	if (drv->remove)
844 		drv->remove(ldev);
845 }
846 
847 static const struct bus_type locomo_bus_type = {
848 	.name		= "locomo-bus",
849 	.match		= locomo_match,
850 	.probe		= locomo_bus_probe,
851 	.remove		= locomo_bus_remove,
852 };
853 
locomo_driver_register(struct locomo_driver * driver)854 int locomo_driver_register(struct locomo_driver *driver)
855 {
856 	driver->drv.bus = &locomo_bus_type;
857 	return driver_register(&driver->drv);
858 }
859 EXPORT_SYMBOL(locomo_driver_register);
860 
locomo_driver_unregister(struct locomo_driver * driver)861 void locomo_driver_unregister(struct locomo_driver *driver)
862 {
863 	driver_unregister(&driver->drv);
864 }
865 EXPORT_SYMBOL(locomo_driver_unregister);
866 
locomo_init(void)867 static int __init locomo_init(void)
868 {
869 	int ret = bus_register(&locomo_bus_type);
870 	if (ret == 0)
871 		platform_driver_register(&locomo_device_driver);
872 	return ret;
873 }
874 
locomo_exit(void)875 static void __exit locomo_exit(void)
876 {
877 	platform_driver_unregister(&locomo_device_driver);
878 	bus_unregister(&locomo_bus_type);
879 }
880 
881 module_init(locomo_init);
882 module_exit(locomo_exit);
883 
884 MODULE_DESCRIPTION("Sharp LoCoMo core driver");
885 MODULE_LICENSE("GPL");
886 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
887