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
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
164 static void locomo_ack_irq(struct irq_data *d)
165 {
166 }
167
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
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
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
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
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
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
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
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
453 static int locomo_remove_child(struct device *dev, void *data)
454 {
455 device_unregister(dev);
456 return 0;
457 }
458
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 */
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
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_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 */
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
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
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
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
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
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
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
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 */
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
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
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
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
861 void locomo_driver_unregister(struct locomo_driver *driver)
862 {
863 driver_unregister(&driver->drv);
864 }
865 EXPORT_SYMBOL(locomo_driver_unregister);
866
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
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
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