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 struct locomo_dev_info {
72 unsigned long offset;
73 unsigned long length;
74 unsigned int devid;
75 unsigned int irq[1];
76 const char * name;
77 };
78
79 /* All the locomo devices. If offset is non-zero, the mapbase for the
80 * locomo_dev will be set to the chip base plus offset. If offset is
81 * zero, then the mapbase for the locomo_dev will be set to zero. An
82 * offset of zero means the device only uses GPIOs or other helper
83 * functions inside this file */
84 static struct locomo_dev_info locomo_devices[] = {
85 {
86 .devid = LOCOMO_DEVID_KEYBOARD,
87 .irq = { IRQ_LOCOMO_KEY },
88 .name = "locomo-keyboard",
89 .offset = LOCOMO_KEYBOARD,
90 .length = 16,
91 },
92 {
93 .devid = LOCOMO_DEVID_FRONTLIGHT,
94 .irq = {},
95 .name = "locomo-frontlight",
96 .offset = LOCOMO_FRONTLIGHT,
97 .length = 8,
98
99 },
100 {
101 .devid = LOCOMO_DEVID_BACKLIGHT,
102 .irq = {},
103 .name = "locomo-backlight",
104 .offset = LOCOMO_BACKLIGHT,
105 .length = 8,
106 },
107 {
108 .devid = LOCOMO_DEVID_AUDIO,
109 .irq = {},
110 .name = "locomo-audio",
111 .offset = LOCOMO_AUDIO,
112 .length = 4,
113 },
114 {
115 .devid = LOCOMO_DEVID_LED,
116 .irq = {},
117 .name = "locomo-led",
118 .offset = LOCOMO_LED,
119 .length = 8,
120 },
121 {
122 .devid = LOCOMO_DEVID_UART,
123 .irq = {},
124 .name = "locomo-uart",
125 .offset = 0,
126 .length = 0,
127 },
128 {
129 .devid = LOCOMO_DEVID_SPI,
130 .irq = {},
131 .name = "locomo-spi",
132 .offset = LOCOMO_SPI,
133 .length = 0x30,
134 },
135 };
136
locomo_handler(struct irq_desc * desc)137 static void locomo_handler(struct irq_desc *desc)
138 {
139 struct locomo *lchip = irq_desc_get_handler_data(desc);
140 int req, i;
141
142 /* Acknowledge the parent IRQ */
143 desc->irq_data.chip->irq_ack(&desc->irq_data);
144
145 /* check why this interrupt was generated */
146 req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
147
148 if (req) {
149 unsigned int irq;
150
151 /* generate the next interrupt(s) */
152 irq = lchip->irq_base;
153 for (i = 0; i <= 3; i++, irq++) {
154 if (req & (0x0100 << i)) {
155 generic_handle_irq(irq);
156 }
157
158 }
159 }
160 }
161
locomo_ack_irq(struct irq_data * d)162 static void locomo_ack_irq(struct irq_data *d)
163 {
164 }
165
locomo_mask_irq(struct irq_data * d)166 static void locomo_mask_irq(struct irq_data *d)
167 {
168 struct locomo *lchip = irq_data_get_irq_chip_data(d);
169 unsigned int r;
170 r = locomo_readl(lchip->base + LOCOMO_ICR);
171 r &= ~(0x0010 << (d->irq - lchip->irq_base));
172 locomo_writel(r, lchip->base + LOCOMO_ICR);
173 }
174
locomo_unmask_irq(struct irq_data * d)175 static void locomo_unmask_irq(struct irq_data *d)
176 {
177 struct locomo *lchip = irq_data_get_irq_chip_data(d);
178 unsigned int r;
179 r = locomo_readl(lchip->base + LOCOMO_ICR);
180 r |= (0x0010 << (d->irq - lchip->irq_base));
181 locomo_writel(r, lchip->base + LOCOMO_ICR);
182 }
183
184 static struct irq_chip locomo_chip = {
185 .name = "LOCOMO",
186 .irq_ack = locomo_ack_irq,
187 .irq_mask = locomo_mask_irq,
188 .irq_unmask = locomo_unmask_irq,
189 };
190
locomo_setup_irq(struct locomo * lchip)191 static void locomo_setup_irq(struct locomo *lchip)
192 {
193 int irq = lchip->irq_base;
194
195 /*
196 * Install handler for IRQ_LOCOMO_HW.
197 */
198 irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
199 irq_set_chained_handler_and_data(lchip->irq, locomo_handler, lchip);
200
201 /* Install handlers for IRQ_LOCOMO_* */
202 for ( ; irq <= lchip->irq_base + 3; irq++) {
203 irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
204 irq_set_chip_data(irq, lchip);
205 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
206 }
207 }
208
209
locomo_dev_release(struct device * _dev)210 static void locomo_dev_release(struct device *_dev)
211 {
212 struct locomo_dev *dev = LOCOMO_DEV(_dev);
213
214 kfree(dev);
215 }
216
217 static int
locomo_init_one_child(struct locomo * lchip,struct locomo_dev_info * info)218 locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
219 {
220 struct locomo_dev *dev;
221 int ret;
222
223 dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
224 if (!dev) {
225 ret = -ENOMEM;
226 goto out;
227 }
228
229 /*
230 * If the parent device has a DMA mask associated with it,
231 * propagate it down to the children.
232 */
233 if (lchip->dev->dma_mask) {
234 dev->dma_mask = *lchip->dev->dma_mask;
235 dev->dev.dma_mask = &dev->dma_mask;
236 }
237
238 dev_set_name(&dev->dev, "%s", info->name);
239 dev->devid = info->devid;
240 dev->dev.parent = lchip->dev;
241 dev->dev.bus = &locomo_bus_type;
242 dev->dev.release = locomo_dev_release;
243 dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
244
245 if (info->offset)
246 dev->mapbase = lchip->base + info->offset;
247 else
248 dev->mapbase = 0;
249 dev->length = info->length;
250
251 dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
252 NO_IRQ : lchip->irq_base + info->irq[0];
253
254 ret = device_register(&dev->dev);
255 if (ret) {
256 out:
257 kfree(dev);
258 }
259 return ret;
260 }
261
262 #ifdef CONFIG_PM
263
264 struct locomo_save_data {
265 u16 LCM_GPO;
266 u16 LCM_SPICT;
267 u16 LCM_GPE;
268 u16 LCM_ASD;
269 u16 LCM_SPIMD;
270 };
271
locomo_suspend(struct platform_device * dev,pm_message_t state)272 static int locomo_suspend(struct platform_device *dev, pm_message_t state)
273 {
274 struct locomo *lchip = platform_get_drvdata(dev);
275 struct locomo_save_data *save;
276 unsigned long flags;
277
278 save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
279 if (!save)
280 return -ENOMEM;
281
282 lchip->saved_state = save;
283
284 spin_lock_irqsave(&lchip->lock, flags);
285
286 save->LCM_GPO = locomo_readl(lchip->base + LOCOMO_GPO); /* GPIO */
287 locomo_writel(0x00, lchip->base + LOCOMO_GPO);
288 save->LCM_SPICT = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT); /* SPI */
289 locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
290 save->LCM_GPE = locomo_readl(lchip->base + LOCOMO_GPE); /* GPIO */
291 locomo_writel(0x00, lchip->base + LOCOMO_GPE);
292 save->LCM_ASD = locomo_readl(lchip->base + LOCOMO_ASD); /* ADSTART */
293 locomo_writel(0x00, lchip->base + LOCOMO_ASD);
294 save->LCM_SPIMD = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD); /* SPI */
295 locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
296
297 locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
298 locomo_writel(0x00, lchip->base + LOCOMO_DAC);
299 locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
300
301 if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
302 locomo_writel(0x00, lchip->base + LOCOMO_C32K); /* CLK32 off */
303 else
304 /* 18MHz already enabled, so no wait */
305 locomo_writel(0xc1, lchip->base + LOCOMO_C32K); /* CLK32 on */
306
307 locomo_writel(0x00, lchip->base + LOCOMO_TADC); /* 18MHz clock off*/
308 locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC); /* 22MHz/24MHz clock off */
309 locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS); /* FL */
310
311 spin_unlock_irqrestore(&lchip->lock, flags);
312
313 return 0;
314 }
315
locomo_resume(struct platform_device * dev)316 static int locomo_resume(struct platform_device *dev)
317 {
318 struct locomo *lchip = platform_get_drvdata(dev);
319 struct locomo_save_data *save;
320 unsigned long r;
321 unsigned long flags;
322
323 save = lchip->saved_state;
324 if (!save)
325 return 0;
326
327 spin_lock_irqsave(&lchip->lock, flags);
328
329 locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
330 locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
331 locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
332 locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
333 locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
334
335 locomo_writel(0x00, lchip->base + LOCOMO_C32K);
336 locomo_writel(0x90, lchip->base + LOCOMO_TADC);
337
338 locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
339 r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
340 r &= 0xFEFF;
341 locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
342 locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
343
344 spin_unlock_irqrestore(&lchip->lock, flags);
345
346 lchip->saved_state = NULL;
347 kfree(save);
348
349 return 0;
350 }
351 #endif
352
353 static int
__locomo_probe(struct device * me,struct resource * mem,int irq)354 __locomo_probe(struct device *me, struct resource *mem, int irq)
355 {
356 struct locomo_platform_data *pdata = me->platform_data;
357 struct locomo *lchip;
358 unsigned long r;
359 int i, ret = -ENODEV;
360
361 lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
362 if (!lchip)
363 return -ENOMEM;
364
365 spin_lock_init(&lchip->lock);
366
367 lchip->dev = me;
368 dev_set_drvdata(lchip->dev, lchip);
369
370 lchip->phys = mem->start;
371 lchip->irq = irq;
372 lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
373
374 /*
375 * Map the whole region. This also maps the
376 * registers for our children.
377 */
378 lchip->base = ioremap(mem->start, PAGE_SIZE);
379 if (!lchip->base) {
380 ret = -ENOMEM;
381 goto out;
382 }
383
384 /* locomo initialize */
385 locomo_writel(0, lchip->base + LOCOMO_ICR);
386 /* KEYBOARD */
387 locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
388
389 /* GPIO */
390 locomo_writel(0, lchip->base + LOCOMO_GPO);
391 locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
392 , lchip->base + LOCOMO_GPE);
393 locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
394 , lchip->base + LOCOMO_GPD);
395 locomo_writel(0, lchip->base + LOCOMO_GIE);
396
397 /* Frontlight */
398 locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
399 locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
400
401 /* Longtime timer */
402 locomo_writel(0, lchip->base + LOCOMO_LTINT);
403 /* SPI */
404 locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
405
406 locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
407 r = locomo_readl(lchip->base + LOCOMO_ASD);
408 r |= 0x8000;
409 locomo_writel(r, lchip->base + LOCOMO_ASD);
410
411 locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
412 r = locomo_readl(lchip->base + LOCOMO_HSD);
413 r |= 0x8000;
414 locomo_writel(r, lchip->base + LOCOMO_HSD);
415
416 locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
417
418 /* XON */
419 locomo_writel(0x80, lchip->base + LOCOMO_TADC);
420 udelay(1000);
421 /* CLK9MEN */
422 r = locomo_readl(lchip->base + LOCOMO_TADC);
423 r |= 0x10;
424 locomo_writel(r, lchip->base + LOCOMO_TADC);
425 udelay(100);
426
427 /* init DAC */
428 r = locomo_readl(lchip->base + LOCOMO_DAC);
429 r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
430 locomo_writel(r, lchip->base + LOCOMO_DAC);
431
432 r = locomo_readl(lchip->base + LOCOMO_VER);
433 printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
434
435 /*
436 * The interrupt controller must be initialised before any
437 * other device to ensure that the interrupts are available.
438 */
439 if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
440 locomo_setup_irq(lchip);
441
442 for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
443 locomo_init_one_child(lchip, &locomo_devices[i]);
444 return 0;
445
446 out:
447 kfree(lchip);
448 return ret;
449 }
450
locomo_remove_child(struct device * dev,void * data)451 static int locomo_remove_child(struct device *dev, void *data)
452 {
453 device_unregister(dev);
454 return 0;
455 }
456
__locomo_remove(struct locomo * lchip)457 static void __locomo_remove(struct locomo *lchip)
458 {
459 device_for_each_child(lchip->dev, NULL, locomo_remove_child);
460
461 if (lchip->irq != NO_IRQ) {
462 irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
463 }
464
465 iounmap(lchip->base);
466 kfree(lchip);
467 }
468
469 /**
470 * locomo_probe - probe for a single LoCoMo chip.
471 * @dev: platform device
472 *
473 * Probe for a LoCoMo chip. This must be called
474 * before any other locomo-specific code.
475 *
476 * Returns:
477 * * %-EINVAL - device's IORESOURCE_MEM not found
478 * * %-ENXIO - could not allocate an IRQ for the device
479 * * %-ENODEV - device not found.
480 * * %-EBUSY - physical address already marked in-use.
481 * * %-ENOMEM - could not allocate or iomap memory.
482 * * %0 - successful.
483 */
locomo_probe(struct platform_device * dev)484 static int locomo_probe(struct platform_device *dev)
485 {
486 struct resource *mem;
487 int irq;
488
489 mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
490 if (!mem)
491 return -EINVAL;
492 irq = platform_get_irq(dev, 0);
493 if (irq < 0)
494 return -ENXIO;
495
496 return __locomo_probe(&dev->dev, mem, irq);
497 }
498
locomo_remove(struct platform_device * dev)499 static void locomo_remove(struct platform_device *dev)
500 {
501 struct locomo *lchip = platform_get_drvdata(dev);
502
503 if (lchip) {
504 __locomo_remove(lchip);
505 platform_set_drvdata(dev, NULL);
506 }
507 }
508
509 /*
510 * Not sure if this should be on the system bus or not yet.
511 * We really want some way to register a system device at
512 * the per-machine level, and then have this driver pick
513 * up the registered devices.
514 */
515 static struct platform_driver locomo_device_driver = {
516 .probe = locomo_probe,
517 .remove_new = locomo_remove,
518 #ifdef CONFIG_PM
519 .suspend = locomo_suspend,
520 .resume = locomo_resume,
521 #endif
522 .driver = {
523 .name = "locomo",
524 },
525 };
526
527 /*
528 * Get the parent device driver (us) structure
529 * from a child function device
530 */
locomo_chip_driver(struct locomo_dev * ldev)531 static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
532 {
533 return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
534 }
535
locomo_gpio_set_dir(struct device * dev,unsigned int bits,unsigned int dir)536 void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
537 {
538 struct locomo *lchip = dev_get_drvdata(dev);
539 unsigned long flags;
540 unsigned int r;
541
542 if (!lchip)
543 return;
544
545 spin_lock_irqsave(&lchip->lock, flags);
546
547 r = locomo_readl(lchip->base + LOCOMO_GPD);
548 if (dir)
549 r |= bits;
550 else
551 r &= ~bits;
552 locomo_writel(r, lchip->base + LOCOMO_GPD);
553
554 r = locomo_readl(lchip->base + LOCOMO_GPE);
555 if (dir)
556 r |= bits;
557 else
558 r &= ~bits;
559 locomo_writel(r, lchip->base + LOCOMO_GPE);
560
561 spin_unlock_irqrestore(&lchip->lock, flags);
562 }
563 EXPORT_SYMBOL(locomo_gpio_set_dir);
564
locomo_gpio_read_level(struct device * dev,unsigned int bits)565 int locomo_gpio_read_level(struct device *dev, unsigned int bits)
566 {
567 struct locomo *lchip = dev_get_drvdata(dev);
568 unsigned long flags;
569 unsigned int ret;
570
571 if (!lchip)
572 return -ENODEV;
573
574 spin_lock_irqsave(&lchip->lock, flags);
575 ret = locomo_readl(lchip->base + LOCOMO_GPL);
576 spin_unlock_irqrestore(&lchip->lock, flags);
577
578 ret &= bits;
579 return ret;
580 }
581 EXPORT_SYMBOL(locomo_gpio_read_level);
582
locomo_gpio_read_output(struct device * dev,unsigned int bits)583 int locomo_gpio_read_output(struct device *dev, unsigned int bits)
584 {
585 struct locomo *lchip = dev_get_drvdata(dev);
586 unsigned long flags;
587 unsigned int ret;
588
589 if (!lchip)
590 return -ENODEV;
591
592 spin_lock_irqsave(&lchip->lock, flags);
593 ret = locomo_readl(lchip->base + LOCOMO_GPO);
594 spin_unlock_irqrestore(&lchip->lock, flags);
595
596 ret &= bits;
597 return ret;
598 }
599 EXPORT_SYMBOL(locomo_gpio_read_output);
600
locomo_gpio_write(struct device * dev,unsigned int bits,unsigned int set)601 void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
602 {
603 struct locomo *lchip = dev_get_drvdata(dev);
604 unsigned long flags;
605 unsigned int r;
606
607 if (!lchip)
608 return;
609
610 spin_lock_irqsave(&lchip->lock, flags);
611
612 r = locomo_readl(lchip->base + LOCOMO_GPO);
613 if (set)
614 r |= bits;
615 else
616 r &= ~bits;
617 locomo_writel(r, lchip->base + LOCOMO_GPO);
618
619 spin_unlock_irqrestore(&lchip->lock, flags);
620 }
621 EXPORT_SYMBOL(locomo_gpio_write);
622
locomo_m62332_sendbit(void * mapbase,int bit)623 static void locomo_m62332_sendbit(void *mapbase, int bit)
624 {
625 unsigned int r;
626
627 r = locomo_readl(mapbase + LOCOMO_DAC);
628 r &= ~(LOCOMO_DAC_SCLOEB);
629 locomo_writel(r, mapbase + LOCOMO_DAC);
630 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
631 udelay(DAC_DATA_HOLD_TIME); /* 300 nsec */
632 r = locomo_readl(mapbase + LOCOMO_DAC);
633 r &= ~(LOCOMO_DAC_SCLOEB);
634 locomo_writel(r, mapbase + LOCOMO_DAC);
635 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
636 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
637
638 if (bit & 1) {
639 r = locomo_readl(mapbase + LOCOMO_DAC);
640 r |= LOCOMO_DAC_SDAOEB;
641 locomo_writel(r, mapbase + LOCOMO_DAC);
642 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
643 } else {
644 r = locomo_readl(mapbase + LOCOMO_DAC);
645 r &= ~(LOCOMO_DAC_SDAOEB);
646 locomo_writel(r, mapbase + LOCOMO_DAC);
647 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
648 }
649
650 udelay(DAC_DATA_SETUP_TIME); /* 250 nsec */
651 r = locomo_readl(mapbase + LOCOMO_DAC);
652 r |= LOCOMO_DAC_SCLOEB;
653 locomo_writel(r, mapbase + LOCOMO_DAC);
654 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
655 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
656 }
657
locomo_m62332_senddata(struct locomo_dev * ldev,unsigned int dac_data,int channel)658 void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
659 {
660 struct locomo *lchip = locomo_chip_driver(ldev);
661 int i;
662 unsigned char data;
663 unsigned int r;
664 void *mapbase = lchip->base;
665 unsigned long flags;
666
667 spin_lock_irqsave(&lchip->lock, flags);
668
669 /* Start */
670 udelay(DAC_BUS_FREE_TIME); /* 5.0 usec */
671 r = locomo_readl(mapbase + LOCOMO_DAC);
672 r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
673 locomo_writel(r, mapbase + LOCOMO_DAC);
674 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
675 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
676 r = locomo_readl(mapbase + LOCOMO_DAC);
677 r &= ~(LOCOMO_DAC_SDAOEB);
678 locomo_writel(r, mapbase + LOCOMO_DAC);
679 udelay(DAC_START_HOLD_TIME); /* 5.0 usec */
680 udelay(DAC_DATA_HOLD_TIME); /* 300 nsec */
681
682 /* Send slave address and W bit (LSB is W bit) */
683 data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
684 for (i = 1; i <= 8; i++) {
685 locomo_m62332_sendbit(mapbase, data >> (8 - i));
686 }
687
688 /* Check A bit */
689 r = locomo_readl(mapbase + LOCOMO_DAC);
690 r &= ~(LOCOMO_DAC_SCLOEB);
691 locomo_writel(r, mapbase + LOCOMO_DAC);
692 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
693 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
694 r = locomo_readl(mapbase + LOCOMO_DAC);
695 r &= ~(LOCOMO_DAC_SDAOEB);
696 locomo_writel(r, mapbase + LOCOMO_DAC);
697 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
698 r = locomo_readl(mapbase + LOCOMO_DAC);
699 r |= LOCOMO_DAC_SCLOEB;
700 locomo_writel(r, mapbase + LOCOMO_DAC);
701 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
702 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
703 if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
704 printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
705 goto out;
706 }
707
708 /* Send Sub address (LSB is channel select) */
709 /* channel = 0 : ch1 select */
710 /* = 1 : ch2 select */
711 data = M62332_SUB_ADDR + channel;
712 for (i = 1; i <= 8; i++) {
713 locomo_m62332_sendbit(mapbase, data >> (8 - i));
714 }
715
716 /* Check A bit */
717 r = locomo_readl(mapbase + LOCOMO_DAC);
718 r &= ~(LOCOMO_DAC_SCLOEB);
719 locomo_writel(r, mapbase + LOCOMO_DAC);
720 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
721 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
722 r = locomo_readl(mapbase + LOCOMO_DAC);
723 r &= ~(LOCOMO_DAC_SDAOEB);
724 locomo_writel(r, mapbase + LOCOMO_DAC);
725 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
726 r = locomo_readl(mapbase + LOCOMO_DAC);
727 r |= LOCOMO_DAC_SCLOEB;
728 locomo_writel(r, mapbase + LOCOMO_DAC);
729 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
730 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
731 if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
732 printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
733 goto out;
734 }
735
736 /* Send DAC data */
737 for (i = 1; i <= 8; i++) {
738 locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
739 }
740
741 /* Check A bit */
742 r = locomo_readl(mapbase + LOCOMO_DAC);
743 r &= ~(LOCOMO_DAC_SCLOEB);
744 locomo_writel(r, mapbase + LOCOMO_DAC);
745 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
746 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
747 r = locomo_readl(mapbase + LOCOMO_DAC);
748 r &= ~(LOCOMO_DAC_SDAOEB);
749 locomo_writel(r, mapbase + LOCOMO_DAC);
750 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
751 r = locomo_readl(mapbase + LOCOMO_DAC);
752 r |= LOCOMO_DAC_SCLOEB;
753 locomo_writel(r, mapbase + LOCOMO_DAC);
754 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
755 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
756 if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
757 printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
758 }
759
760 out:
761 /* stop */
762 r = locomo_readl(mapbase + LOCOMO_DAC);
763 r &= ~(LOCOMO_DAC_SCLOEB);
764 locomo_writel(r, mapbase + LOCOMO_DAC);
765 udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
766 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
767 r = locomo_readl(mapbase + LOCOMO_DAC);
768 r |= LOCOMO_DAC_SCLOEB;
769 locomo_writel(r, mapbase + LOCOMO_DAC);
770 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
771 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
772 r = locomo_readl(mapbase + LOCOMO_DAC);
773 r |= LOCOMO_DAC_SDAOEB;
774 locomo_writel(r, mapbase + LOCOMO_DAC);
775 udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
776 udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
777
778 r = locomo_readl(mapbase + LOCOMO_DAC);
779 r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
780 locomo_writel(r, mapbase + LOCOMO_DAC);
781 udelay(DAC_LOW_SETUP_TIME); /* 1000 nsec */
782 udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
783
784 spin_unlock_irqrestore(&lchip->lock, flags);
785 }
786 EXPORT_SYMBOL(locomo_m62332_senddata);
787
788 /*
789 * Frontlight control
790 */
791
locomo_frontlight_set(struct locomo_dev * dev,int duty,int vr,int bpwf)792 void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
793 {
794 unsigned long flags;
795 struct locomo *lchip = locomo_chip_driver(dev);
796
797 if (vr)
798 locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
799 else
800 locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
801
802 spin_lock_irqsave(&lchip->lock, flags);
803 locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
804 udelay(100);
805 locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
806 locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
807 spin_unlock_irqrestore(&lchip->lock, flags);
808 }
809 EXPORT_SYMBOL(locomo_frontlight_set);
810
811 /*
812 * LoCoMo "Register Access Bus."
813 *
814 * We model this as a regular bus type, and hang devices directly
815 * off this.
816 */
locomo_match(struct device * _dev,struct device_driver * _drv)817 static int locomo_match(struct device *_dev, struct device_driver *_drv)
818 {
819 struct locomo_dev *dev = LOCOMO_DEV(_dev);
820 struct locomo_driver *drv = LOCOMO_DRV(_drv);
821
822 return dev->devid == drv->devid;
823 }
824
locomo_bus_probe(struct device * dev)825 static int locomo_bus_probe(struct device *dev)
826 {
827 struct locomo_dev *ldev = LOCOMO_DEV(dev);
828 struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
829 int ret = -ENODEV;
830
831 if (drv->probe)
832 ret = drv->probe(ldev);
833 return ret;
834 }
835
locomo_bus_remove(struct device * dev)836 static void locomo_bus_remove(struct device *dev)
837 {
838 struct locomo_dev *ldev = LOCOMO_DEV(dev);
839 struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
840
841 if (drv->remove)
842 drv->remove(ldev);
843 }
844
845 struct bus_type locomo_bus_type = {
846 .name = "locomo-bus",
847 .match = locomo_match,
848 .probe = locomo_bus_probe,
849 .remove = locomo_bus_remove,
850 };
851
locomo_driver_register(struct locomo_driver * driver)852 int locomo_driver_register(struct locomo_driver *driver)
853 {
854 driver->drv.bus = &locomo_bus_type;
855 return driver_register(&driver->drv);
856 }
857 EXPORT_SYMBOL(locomo_driver_register);
858
locomo_driver_unregister(struct locomo_driver * driver)859 void locomo_driver_unregister(struct locomo_driver *driver)
860 {
861 driver_unregister(&driver->drv);
862 }
863 EXPORT_SYMBOL(locomo_driver_unregister);
864
locomo_init(void)865 static int __init locomo_init(void)
866 {
867 int ret = bus_register(&locomo_bus_type);
868 if (ret == 0)
869 platform_driver_register(&locomo_device_driver);
870 return ret;
871 }
872
locomo_exit(void)873 static void __exit locomo_exit(void)
874 {
875 platform_driver_unregister(&locomo_device_driver);
876 bus_unregister(&locomo_bus_type);
877 }
878
879 module_init(locomo_init);
880 module_exit(locomo_exit);
881
882 MODULE_DESCRIPTION("Sharp LoCoMo core driver");
883 MODULE_LICENSE("GPL");
884 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
885