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TOMOYO Linux Cross Reference
Linux/arch/arm/common/locomo.c

Version: ~ [ linux-5.1-rc2 ] ~ [ linux-5.0.4 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.31 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.108 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.165 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.177 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.137 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 */
 63 struct 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 
 75 struct 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 */
 88 static 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 
141 static 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 
166 static void locomo_ack_irq(struct irq_data *d)
167 {
168 }
169 
170 static 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 
179 static 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 
188 static 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 
195 static 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 
214 static void locomo_dev_release(struct device *_dev)
215 {
216         struct locomo_dev *dev = LOCOMO_DEV(_dev);
217 
218         kfree(dev);
219 }
220 
221 static int
222 locomo_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 
268 struct 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 
276 static 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 
320 static 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  */
370 static 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 
468 static int locomo_remove_child(struct device *dev, void *data)
469 {
470         device_unregister(dev);
471         return 0;
472 } 
473 
474 static 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 
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 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  */
519 static 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  */
535 static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
536 {
537         return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
538 }
539 
540 void 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 }
567 EXPORT_SYMBOL(locomo_gpio_set_dir);
568 
569 int 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 }
585 EXPORT_SYMBOL(locomo_gpio_read_level);
586 
587 int 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 }
603 EXPORT_SYMBOL(locomo_gpio_read_output);
604 
605 void 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 }
625 EXPORT_SYMBOL(locomo_gpio_write);
626 
627 static 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 
662 void 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 
764 out:
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 }
790 EXPORT_SYMBOL(locomo_m62332_senddata);
791 
792 /*
793  *      Frontlight control
794  */
795 
796 void 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 }
813 EXPORT_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  */
821 static 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 
829 static int locomo_bus_probe(struct device *dev)
830 {
831         struct locomo_dev *ldev = LOCOMO_DEV(dev);
832         struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
833         int ret = -ENODEV;
834 
835         if (drv->probe)
836                 ret = drv->probe(ldev);
837         return ret;
838 }
839 
840 static int locomo_bus_remove(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->remove)
847                 ret = drv->remove(ldev);
848         return ret;
849 }
850 
851 struct bus_type locomo_bus_type = {
852         .name           = "locomo-bus",
853         .match          = locomo_match,
854         .probe          = locomo_bus_probe,
855         .remove         = locomo_bus_remove,
856 };
857 
858 int locomo_driver_register(struct locomo_driver *driver)
859 {
860         driver->drv.bus = &locomo_bus_type;
861         return driver_register(&driver->drv);
862 }
863 EXPORT_SYMBOL(locomo_driver_register);
864 
865 void locomo_driver_unregister(struct locomo_driver *driver)
866 {
867         driver_unregister(&driver->drv);
868 }
869 EXPORT_SYMBOL(locomo_driver_unregister);
870 
871 static int __init locomo_init(void)
872 {
873         int ret = bus_register(&locomo_bus_type);
874         if (ret == 0)
875                 platform_driver_register(&locomo_device_driver);
876         return ret;
877 }
878 
879 static void __exit locomo_exit(void)
880 {
881         platform_driver_unregister(&locomo_device_driver);
882         bus_unregister(&locomo_bus_type);
883 }
884 
885 module_init(locomo_init);
886 module_exit(locomo_exit);
887 
888 MODULE_DESCRIPTION("Sharp LoCoMo core driver");
889 MODULE_LICENSE("GPL");
890 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
891 

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