Root/arch/arm/common/locomo.c

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(unsigned int irq, struct irq_desc *desc)
142{
143    struct locomo *lchip = get_irq_chip_data(irq);
144    int req, i;
145
146    /* Acknowledge the parent IRQ */
147    desc->chip->ack(irq);
148
149    /* check why this interrupt was generated */
150    req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
151
152    if (req) {
153        /* generate the next interrupt(s) */
154        irq = lchip->irq_base;
155        for (i = 0; i <= 3; i++, irq++) {
156            if (req & (0x0100 << i)) {
157                generic_handle_irq(irq);
158            }
159
160        }
161    }
162}
163
164static void locomo_ack_irq(unsigned int irq)
165{
166}
167
168static void locomo_mask_irq(unsigned int irq)
169{
170    struct locomo *lchip = get_irq_chip_data(irq);
171    unsigned int r;
172    r = locomo_readl(lchip->base + LOCOMO_ICR);
173    r &= ~(0x0010 << (irq - lchip->irq_base));
174    locomo_writel(r, lchip->base + LOCOMO_ICR);
175}
176
177static void locomo_unmask_irq(unsigned int irq)
178{
179    struct locomo *lchip = get_irq_chip_data(irq);
180    unsigned int r;
181    r = locomo_readl(lchip->base + LOCOMO_ICR);
182    r |= (0x0010 << (irq - lchip->irq_base));
183    locomo_writel(r, lchip->base + LOCOMO_ICR);
184}
185
186static struct irq_chip locomo_chip = {
187    .name = "LOCOMO",
188    .ack = locomo_ack_irq,
189    .mask = locomo_mask_irq,
190    .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    set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
201    set_irq_chip_data(lchip->irq, lchip);
202    set_irq_chained_handler(lchip->irq, locomo_handler);
203
204    /* Install handlers for IRQ_LOCOMO_* */
205    for ( ; irq <= lchip->irq_base + 3; irq++) {
206        set_irq_chip(irq, &locomo_chip);
207        set_irq_chip_data(irq, lchip);
208        set_irq_handler(irq, handle_level_irq);
209        set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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        set_irq_chained_handler(lchip->irq, NULL);
480        set_irq_data(lchip->irq, NULL);
481    }
482
483    iounmap(lchip->base);
484    kfree(lchip);
485}
486
487static int locomo_probe(struct platform_device *dev)
488{
489    struct resource *mem;
490    int irq;
491
492    mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
493    if (!mem)
494        return -EINVAL;
495    irq = platform_get_irq(dev, 0);
496    if (irq < 0)
497        return -ENXIO;
498
499    return __locomo_probe(&dev->dev, mem, irq);
500}
501
502static int locomo_remove(struct platform_device *dev)
503{
504    struct locomo *lchip = platform_get_drvdata(dev);
505
506    if (lchip) {
507        __locomo_remove(lchip);
508        platform_set_drvdata(dev, NULL);
509    }
510
511    return 0;
512}
513
514/*
515 * Not sure if this should be on the system bus or not yet.
516 * We really want some way to register a system device at
517 * the per-machine level, and then have this driver pick
518 * up the registered devices.
519 */
520static struct platform_driver locomo_device_driver = {
521    .probe = locomo_probe,
522    .remove = locomo_remove,
523#ifdef CONFIG_PM
524    .suspend = locomo_suspend,
525    .resume = locomo_resume,
526#endif
527    .driver = {
528        .name = "locomo",
529    },
530};
531
532/*
533 * Get the parent device driver (us) structure
534 * from a child function device
535 */
536static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
537{
538    return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
539}
540
541void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
542{
543    struct locomo *lchip = dev_get_drvdata(dev);
544    unsigned long flags;
545    unsigned int r;
546
547    if (!lchip)
548        return;
549
550    spin_lock_irqsave(&lchip->lock, flags);
551
552    r = locomo_readl(lchip->base + LOCOMO_GPD);
553    if (dir)
554        r |= bits;
555    else
556        r &= ~bits;
557    locomo_writel(r, lchip->base + LOCOMO_GPD);
558
559    r = locomo_readl(lchip->base + LOCOMO_GPE);
560    if (dir)
561        r |= bits;
562    else
563        r &= ~bits;
564    locomo_writel(r, lchip->base + LOCOMO_GPE);
565
566    spin_unlock_irqrestore(&lchip->lock, flags);
567}
568EXPORT_SYMBOL(locomo_gpio_set_dir);
569
570int locomo_gpio_read_level(struct device *dev, unsigned int bits)
571{
572    struct locomo *lchip = dev_get_drvdata(dev);
573    unsigned long flags;
574    unsigned int ret;
575
576    if (!lchip)
577        return -ENODEV;
578
579    spin_lock_irqsave(&lchip->lock, flags);
580    ret = locomo_readl(lchip->base + LOCOMO_GPL);
581    spin_unlock_irqrestore(&lchip->lock, flags);
582
583    ret &= bits;
584    return ret;
585}
586EXPORT_SYMBOL(locomo_gpio_read_level);
587
588int locomo_gpio_read_output(struct device *dev, unsigned int bits)
589{
590    struct locomo *lchip = dev_get_drvdata(dev);
591    unsigned long flags;
592    unsigned int ret;
593
594    if (!lchip)
595        return -ENODEV;
596
597    spin_lock_irqsave(&lchip->lock, flags);
598    ret = locomo_readl(lchip->base + LOCOMO_GPO);
599    spin_unlock_irqrestore(&lchip->lock, flags);
600
601    ret &= bits;
602    return ret;
603}
604EXPORT_SYMBOL(locomo_gpio_read_output);
605
606void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
607{
608    struct locomo *lchip = dev_get_drvdata(dev);
609    unsigned long flags;
610    unsigned int r;
611
612    if (!lchip)
613        return;
614
615    spin_lock_irqsave(&lchip->lock, flags);
616
617    r = locomo_readl(lchip->base + LOCOMO_GPO);
618    if (set)
619        r |= bits;
620    else
621        r &= ~bits;
622    locomo_writel(r, lchip->base + LOCOMO_GPO);
623
624    spin_unlock_irqrestore(&lchip->lock, flags);
625}
626EXPORT_SYMBOL(locomo_gpio_write);
627
628static void locomo_m62332_sendbit(void *mapbase, int bit)
629{
630    unsigned int r;
631
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_DATA_HOLD_TIME); /* 300 nsec */
637    r = locomo_readl(mapbase + LOCOMO_DAC);
638    r &= ~(LOCOMO_DAC_SCLOEB);
639    locomo_writel(r, mapbase + LOCOMO_DAC);
640    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
641    udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
642
643    if (bit & 1) {
644        r = locomo_readl(mapbase + LOCOMO_DAC);
645        r |= LOCOMO_DAC_SDAOEB;
646        locomo_writel(r, mapbase + LOCOMO_DAC);
647        udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
648    } else {
649        r = locomo_readl(mapbase + LOCOMO_DAC);
650        r &= ~(LOCOMO_DAC_SDAOEB);
651        locomo_writel(r, mapbase + LOCOMO_DAC);
652        udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
653    }
654
655    udelay(DAC_DATA_SETUP_TIME); /* 250 nsec */
656    r = locomo_readl(mapbase + LOCOMO_DAC);
657    r |= LOCOMO_DAC_SCLOEB;
658    locomo_writel(r, mapbase + LOCOMO_DAC);
659    udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
660    udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
661}
662
663void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
664{
665    struct locomo *lchip = locomo_chip_driver(ldev);
666    int i;
667    unsigned char data;
668    unsigned int r;
669    void *mapbase = lchip->base;
670    unsigned long flags;
671
672    spin_lock_irqsave(&lchip->lock, flags);
673
674    /* Start */
675    udelay(DAC_BUS_FREE_TIME); /* 5.0 usec */
676    r = locomo_readl(mapbase + LOCOMO_DAC);
677    r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
678    locomo_writel(r, mapbase + LOCOMO_DAC);
679    udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
680    udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
681    r = locomo_readl(mapbase + LOCOMO_DAC);
682    r &= ~(LOCOMO_DAC_SDAOEB);
683    locomo_writel(r, mapbase + LOCOMO_DAC);
684    udelay(DAC_START_HOLD_TIME); /* 5.0 usec */
685    udelay(DAC_DATA_HOLD_TIME); /* 300 nsec */
686
687    /* Send slave address and W bit (LSB is W bit) */
688    data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
689    for (i = 1; i <= 8; i++) {
690        locomo_m62332_sendbit(mapbase, data >> (8 - i));
691    }
692
693    /* Check A bit */
694    r = locomo_readl(mapbase + LOCOMO_DAC);
695    r &= ~(LOCOMO_DAC_SCLOEB);
696    locomo_writel(r, mapbase + LOCOMO_DAC);
697    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
698    udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
699    r = locomo_readl(mapbase + LOCOMO_DAC);
700    r &= ~(LOCOMO_DAC_SDAOEB);
701    locomo_writel(r, mapbase + LOCOMO_DAC);
702    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
703    r = locomo_readl(mapbase + LOCOMO_DAC);
704    r |= LOCOMO_DAC_SCLOEB;
705    locomo_writel(r, mapbase + LOCOMO_DAC);
706    udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
707    udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
708    if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
709        printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
710        goto out;
711    }
712
713    /* Send Sub address (LSB is channel select) */
714    /* channel = 0 : ch1 select */
715    /* = 1 : ch2 select */
716    data = M62332_SUB_ADDR + channel;
717    for (i = 1; i <= 8; i++) {
718        locomo_m62332_sendbit(mapbase, data >> (8 - i));
719    }
720
721    /* Check A bit */
722    r = locomo_readl(mapbase + LOCOMO_DAC);
723    r &= ~(LOCOMO_DAC_SCLOEB);
724    locomo_writel(r, mapbase + LOCOMO_DAC);
725    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
726    udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
727    r = locomo_readl(mapbase + LOCOMO_DAC);
728    r &= ~(LOCOMO_DAC_SDAOEB);
729    locomo_writel(r, mapbase + LOCOMO_DAC);
730    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
731    r = locomo_readl(mapbase + LOCOMO_DAC);
732    r |= LOCOMO_DAC_SCLOEB;
733    locomo_writel(r, mapbase + LOCOMO_DAC);
734    udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
735    udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
736    if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
737        printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
738        goto out;
739    }
740
741    /* Send DAC data */
742    for (i = 1; i <= 8; i++) {
743        locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
744    }
745
746    /* Check A bit */
747    r = locomo_readl(mapbase + LOCOMO_DAC);
748    r &= ~(LOCOMO_DAC_SCLOEB);
749    locomo_writel(r, mapbase + LOCOMO_DAC);
750    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
751    udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
752    r = locomo_readl(mapbase + LOCOMO_DAC);
753    r &= ~(LOCOMO_DAC_SDAOEB);
754    locomo_writel(r, mapbase + LOCOMO_DAC);
755    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
756    r = locomo_readl(mapbase + LOCOMO_DAC);
757    r |= LOCOMO_DAC_SCLOEB;
758    locomo_writel(r, mapbase + LOCOMO_DAC);
759    udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
760    udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
761    if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) { /* High is error */
762        printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
763    }
764
765out:
766    /* stop */
767    r = locomo_readl(mapbase + LOCOMO_DAC);
768    r &= ~(LOCOMO_DAC_SCLOEB);
769    locomo_writel(r, mapbase + LOCOMO_DAC);
770    udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
771    udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
772    r = locomo_readl(mapbase + LOCOMO_DAC);
773    r |= LOCOMO_DAC_SCLOEB;
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    r = locomo_readl(mapbase + LOCOMO_DAC);
778    r |= LOCOMO_DAC_SDAOEB;
779    locomo_writel(r, mapbase + LOCOMO_DAC);
780    udelay(DAC_HIGH_SETUP_TIME); /* 1000 nsec */
781    udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
782
783    r = locomo_readl(mapbase + LOCOMO_DAC);
784    r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
785    locomo_writel(r, mapbase + LOCOMO_DAC);
786    udelay(DAC_LOW_SETUP_TIME); /* 1000 nsec */
787    udelay(DAC_SCL_LOW_HOLD_TIME); /* 4.7 usec */
788
789    spin_unlock_irqrestore(&lchip->lock, flags);
790}
791EXPORT_SYMBOL(locomo_m62332_senddata);
792
793/*
794 * Frontlight control
795 */
796
797void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
798{
799    unsigned long flags;
800    struct locomo *lchip = locomo_chip_driver(dev);
801
802    if (vr)
803        locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
804    else
805        locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
806
807    spin_lock_irqsave(&lchip->lock, flags);
808    locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
809    udelay(100);
810    locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
811    locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
812    spin_unlock_irqrestore(&lchip->lock, flags);
813}
814EXPORT_SYMBOL(locomo_frontlight_set);
815
816/*
817 * LoCoMo "Register Access Bus."
818 *
819 * We model this as a regular bus type, and hang devices directly
820 * off this.
821 */
822static int locomo_match(struct device *_dev, struct device_driver *_drv)
823{
824    struct locomo_dev *dev = LOCOMO_DEV(_dev);
825    struct locomo_driver *drv = LOCOMO_DRV(_drv);
826
827    return dev->devid == drv->devid;
828}
829
830static int locomo_bus_suspend(struct device *dev, pm_message_t state)
831{
832    struct locomo_dev *ldev = LOCOMO_DEV(dev);
833    struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
834    int ret = 0;
835
836    if (drv && drv->suspend)
837        ret = drv->suspend(ldev, state);
838    return ret;
839}
840
841static int locomo_bus_resume(struct device *dev)
842{
843    struct locomo_dev *ldev = LOCOMO_DEV(dev);
844    struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
845    int ret = 0;
846
847    if (drv && drv->resume)
848        ret = drv->resume(ldev);
849    return ret;
850}
851
852static int locomo_bus_probe(struct device *dev)
853{
854    struct locomo_dev *ldev = LOCOMO_DEV(dev);
855    struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
856    int ret = -ENODEV;
857
858    if (drv->probe)
859        ret = drv->probe(ldev);
860    return ret;
861}
862
863static int locomo_bus_remove(struct device *dev)
864{
865    struct locomo_dev *ldev = LOCOMO_DEV(dev);
866    struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
867    int ret = 0;
868
869    if (drv->remove)
870        ret = drv->remove(ldev);
871    return ret;
872}
873
874struct bus_type locomo_bus_type = {
875    .name = "locomo-bus",
876    .match = locomo_match,
877    .probe = locomo_bus_probe,
878    .remove = locomo_bus_remove,
879    .suspend = locomo_bus_suspend,
880    .resume = locomo_bus_resume,
881};
882
883int locomo_driver_register(struct locomo_driver *driver)
884{
885    driver->drv.bus = &locomo_bus_type;
886    return driver_register(&driver->drv);
887}
888EXPORT_SYMBOL(locomo_driver_register);
889
890void locomo_driver_unregister(struct locomo_driver *driver)
891{
892    driver_unregister(&driver->drv);
893}
894EXPORT_SYMBOL(locomo_driver_unregister);
895
896static int __init locomo_init(void)
897{
898    int ret = bus_register(&locomo_bus_type);
899    if (ret == 0)
900        platform_driver_register(&locomo_device_driver);
901    return ret;
902}
903
904static void __exit locomo_exit(void)
905{
906    platform_driver_unregister(&locomo_device_driver);
907    bus_unregister(&locomo_bus_type);
908}
909
910module_init(locomo_init);
911module_exit(locomo_exit);
912
913MODULE_DESCRIPTION("Sharp LoCoMo core driver");
914MODULE_LICENSE("GPL");
915MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
916

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