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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 */
59struct 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
71static const struct bus_type locomo_bus_type;
72
73struct 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 */
86static 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
139static 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
164static void locomo_ack_irq(struct irq_data *d)
165{
166}
167
168static 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
177static 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
186static 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
193static 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
212static void locomo_dev_release(struct device *_dev)
213{
214 struct locomo_dev *dev = LOCOMO_DEV(_dev);
215
216 kfree(dev);
217}
218
219static int
220locomo_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
266struct 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
274static 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
318static 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
355static int
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
453static int locomo_remove_child(struct device *dev, void *data)
454{
455 device_unregister(dev);
456 return 0;
457}
458
459static 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 */
486static 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
501static 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 */
517static struct platform_driver locomo_device_driver = {
518 .probe = locomo_probe,
519 .remove_new = 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 */
533static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
534{
535 return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
536}
537
538void 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}
565EXPORT_SYMBOL(locomo_gpio_set_dir);
566
567int 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}
583EXPORT_SYMBOL(locomo_gpio_read_level);
584
585int 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}
601EXPORT_SYMBOL(locomo_gpio_read_output);
602
603void 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}
623EXPORT_SYMBOL(locomo_gpio_write);
624
625static 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
660void 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
762out:
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}
788EXPORT_SYMBOL(locomo_m62332_senddata);
789
790/*
791 * Frontlight control
792 */
793
794void 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}
811EXPORT_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 */
819static int locomo_match(struct device *_dev, struct device_driver *_drv)
820{
821 struct locomo_dev *dev = LOCOMO_DEV(_dev);
822 struct locomo_driver *drv = LOCOMO_DRV(_drv);
823
824 return dev->devid == drv->devid;
825}
826
827static 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
838static 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
847static 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
854int locomo_driver_register(struct locomo_driver *driver)
855{
856 driver->drv.bus = &locomo_bus_type;
857 return driver_register(&driver->drv);
858}
859EXPORT_SYMBOL(locomo_driver_register);
860
861void locomo_driver_unregister(struct locomo_driver *driver)
862{
863 driver_unregister(&driver->drv);
864}
865EXPORT_SYMBOL(locomo_driver_unregister);
866
867static 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
875static void __exit locomo_exit(void)
876{
877 platform_driver_unregister(&locomo_device_driver);
878 bus_unregister(&locomo_bus_type);
879}
880
881module_init(locomo_init);
882module_exit(locomo_exit);
883
884MODULE_DESCRIPTION("Sharp LoCoMo core driver");
885MODULE_LICENSE("GPL");
886MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
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 */
63struct 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
75struct 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 */
88static 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
141static void locomo_handler(struct irq_desc *desc)
142{
143 struct locomo *lchip = irq_desc_get_handler_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
166static void locomo_ack_irq(struct irq_data *d)
167{
168}
169
170static 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
179static 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
188static 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
195static 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_chained_handler_and_data(lchip->irq, locomo_handler, lchip);
204
205 /* Install handlers for IRQ_LOCOMO_* */
206 for ( ; irq <= lchip->irq_base + 3; irq++) {
207 irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
208 irq_set_chip_data(irq, lchip);
209 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
210 }
211}
212
213
214static void locomo_dev_release(struct device *_dev)
215{
216 struct locomo_dev *dev = LOCOMO_DEV(_dev);
217
218 kfree(dev);
219}
220
221static int
222locomo_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
268struct 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
276static 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
320static 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 */
370static 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
468static int locomo_remove_child(struct device *dev, void *data)
469{
470 device_unregister(dev);
471 return 0;
472}
473
474static 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 irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
480 }
481
482 iounmap(lchip->base);
483 kfree(lchip);
484}
485
486static 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
501static 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 */
519static 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 */
535static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
536{
537 return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
538}
539
540void 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}
567EXPORT_SYMBOL(locomo_gpio_set_dir);
568
569int 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}
585EXPORT_SYMBOL(locomo_gpio_read_level);
586
587int 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}
603EXPORT_SYMBOL(locomo_gpio_read_output);
604
605void 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}
625EXPORT_SYMBOL(locomo_gpio_write);
626
627static 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
662void 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
764out:
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}
790EXPORT_SYMBOL(locomo_m62332_senddata);
791
792/*
793 * Frontlight control
794 */
795
796void 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}
813EXPORT_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 */
821static 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
829static 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
840static 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
851static 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
862static 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
873struct 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
882int locomo_driver_register(struct locomo_driver *driver)
883{
884 driver->drv.bus = &locomo_bus_type;
885 return driver_register(&driver->drv);
886}
887EXPORT_SYMBOL(locomo_driver_register);
888
889void locomo_driver_unregister(struct locomo_driver *driver)
890{
891 driver_unregister(&driver->drv);
892}
893EXPORT_SYMBOL(locomo_driver_unregister);
894
895static 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
903static void __exit locomo_exit(void)
904{
905 platform_driver_unregister(&locomo_device_driver);
906 bus_unregister(&locomo_bus_type);
907}
908
909module_init(locomo_init);
910module_exit(locomo_exit);
911
912MODULE_DESCRIPTION("Sharp LoCoMo core driver");
913MODULE_LICENSE("GPL");
914MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");