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OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * linux/arch/arm/common/locomo.c
0004  *
0005  * Sharp LoCoMo support
0006  *
0007  * This file contains all generic LoCoMo support.
0008  *
0009  * All initialization functions provided here are intended to be called
0010  * from machine specific code with proper arguments when required.
0011  *
0012  * Based on sa1111.c
0013  */
0014 
0015 #include <linux/module.h>
0016 #include <linux/init.h>
0017 #include <linux/kernel.h>
0018 #include <linux/delay.h>
0019 #include <linux/errno.h>
0020 #include <linux/ioport.h>
0021 #include <linux/platform_device.h>
0022 #include <linux/slab.h>
0023 #include <linux/spinlock.h>
0024 #include <linux/io.h>
0025 
0026 #include <asm/irq.h>
0027 #include <asm/mach/irq.h>
0028 
0029 #include <asm/hardware/locomo.h>
0030 
0031 /* LoCoMo Interrupts */
0032 #define IRQ_LOCOMO_KEY      (0)
0033 #define IRQ_LOCOMO_GPIO     (1)
0034 #define IRQ_LOCOMO_LT       (2)
0035 #define IRQ_LOCOMO_SPI      (3)
0036 
0037 /* M62332 output channel selection */
0038 #define M62332_EVR_CH   1   /* M62332 volume channel number  */
0039                 /*   0 : CH.1 , 1 : CH. 2        */
0040 /* DAC send data */
0041 #define M62332_SLAVE_ADDR   0x4e    /* Slave address  */
0042 #define M62332_W_BIT        0x00    /* W bit (0 only) */
0043 #define M62332_SUB_ADDR     0x00    /* Sub address    */
0044 #define M62332_A_BIT        0x00    /* A bit (0 only) */
0045 
0046 /* DAC setup and hold times (expressed in us) */
0047 #define DAC_BUS_FREE_TIME   5   /*   4.7 us */
0048 #define DAC_START_SETUP_TIME    5   /*   4.7 us */
0049 #define DAC_STOP_SETUP_TIME 4   /*   4.0 us */
0050 #define DAC_START_HOLD_TIME 5   /*   4.7 us */
0051 #define DAC_SCL_LOW_HOLD_TIME   5   /*   4.7 us */
0052 #define DAC_SCL_HIGH_HOLD_TIME  4   /*   4.0 us */
0053 #define DAC_DATA_SETUP_TIME 1   /*   250 ns */
0054 #define DAC_DATA_HOLD_TIME  1   /*   300 ns */
0055 #define DAC_LOW_SETUP_TIME  1   /*   300 ns */
0056 #define DAC_HIGH_SETUP_TIME 1   /*  1000 ns */
0057 
0058 /* the following is the overall data for the locomo chip */
0059 struct locomo {
0060     struct device *dev;
0061     unsigned long phys;
0062     unsigned int irq;
0063     int irq_base;
0064     spinlock_t lock;
0065     void __iomem *base;
0066 #ifdef CONFIG_PM
0067     void *saved_state;
0068 #endif
0069 };
0070 
0071 struct locomo_dev_info {
0072     unsigned long   offset;
0073     unsigned long   length;
0074     unsigned int    devid;
0075     unsigned int    irq[1];
0076     const char *    name;
0077 };
0078 
0079 /* All the locomo devices.  If offset is non-zero, the mapbase for the
0080  * locomo_dev will be set to the chip base plus offset.  If offset is
0081  * zero, then the mapbase for the locomo_dev will be set to zero.  An
0082  * offset of zero means the device only uses GPIOs or other helper
0083  * functions inside this file */
0084 static struct locomo_dev_info locomo_devices[] = {
0085     {
0086         .devid      = LOCOMO_DEVID_KEYBOARD,
0087         .irq        = { IRQ_LOCOMO_KEY },
0088         .name       = "locomo-keyboard",
0089         .offset     = LOCOMO_KEYBOARD,
0090         .length     = 16,
0091     },
0092     {
0093         .devid      = LOCOMO_DEVID_FRONTLIGHT,
0094         .irq        = {},
0095         .name       = "locomo-frontlight",
0096         .offset     = LOCOMO_FRONTLIGHT,
0097         .length     = 8,
0098 
0099     },
0100     {
0101         .devid      = LOCOMO_DEVID_BACKLIGHT,
0102         .irq        = {},
0103         .name       = "locomo-backlight",
0104         .offset     = LOCOMO_BACKLIGHT,
0105         .length     = 8,
0106     },
0107     {
0108         .devid      = LOCOMO_DEVID_AUDIO,
0109         .irq        = {},
0110         .name       = "locomo-audio",
0111         .offset     = LOCOMO_AUDIO,
0112         .length     = 4,
0113     },
0114     {
0115         .devid      = LOCOMO_DEVID_LED,
0116         .irq        = {},
0117         .name       = "locomo-led",
0118         .offset     = LOCOMO_LED,
0119         .length     = 8,
0120     },
0121     {
0122         .devid      = LOCOMO_DEVID_UART,
0123         .irq        = {},
0124         .name       = "locomo-uart",
0125         .offset     = 0,
0126         .length     = 0,
0127     },
0128     {
0129         .devid      = LOCOMO_DEVID_SPI,
0130         .irq        = {},
0131         .name       = "locomo-spi",
0132         .offset     = LOCOMO_SPI,
0133         .length     = 0x30,
0134     },
0135 };
0136 
0137 static void locomo_handler(struct irq_desc *desc)
0138 {
0139     struct locomo *lchip = irq_desc_get_handler_data(desc);
0140     int req, i;
0141 
0142     /* Acknowledge the parent IRQ */
0143     desc->irq_data.chip->irq_ack(&desc->irq_data);
0144 
0145     /* check why this interrupt was generated */
0146     req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
0147 
0148     if (req) {
0149         unsigned int irq;
0150 
0151         /* generate the next interrupt(s) */
0152         irq = lchip->irq_base;
0153         for (i = 0; i <= 3; i++, irq++) {
0154             if (req & (0x0100 << i)) {
0155                 generic_handle_irq(irq);
0156             }
0157 
0158         }
0159     }
0160 }
0161 
0162 static void locomo_ack_irq(struct irq_data *d)
0163 {
0164 }
0165 
0166 static void locomo_mask_irq(struct irq_data *d)
0167 {
0168     struct locomo *lchip = irq_data_get_irq_chip_data(d);
0169     unsigned int r;
0170     r = locomo_readl(lchip->base + LOCOMO_ICR);
0171     r &= ~(0x0010 << (d->irq - lchip->irq_base));
0172     locomo_writel(r, lchip->base + LOCOMO_ICR);
0173 }
0174 
0175 static void locomo_unmask_irq(struct irq_data *d)
0176 {
0177     struct locomo *lchip = irq_data_get_irq_chip_data(d);
0178     unsigned int r;
0179     r = locomo_readl(lchip->base + LOCOMO_ICR);
0180     r |= (0x0010 << (d->irq - lchip->irq_base));
0181     locomo_writel(r, lchip->base + LOCOMO_ICR);
0182 }
0183 
0184 static struct irq_chip locomo_chip = {
0185     .name       = "LOCOMO",
0186     .irq_ack    = locomo_ack_irq,
0187     .irq_mask   = locomo_mask_irq,
0188     .irq_unmask = locomo_unmask_irq,
0189 };
0190 
0191 static void locomo_setup_irq(struct locomo *lchip)
0192 {
0193     int irq = lchip->irq_base;
0194 
0195     /*
0196      * Install handler for IRQ_LOCOMO_HW.
0197      */
0198     irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
0199     irq_set_chained_handler_and_data(lchip->irq, locomo_handler, lchip);
0200 
0201     /* Install handlers for IRQ_LOCOMO_* */
0202     for ( ; irq <= lchip->irq_base + 3; irq++) {
0203         irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
0204         irq_set_chip_data(irq, lchip);
0205         irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
0206     }
0207 }
0208 
0209 
0210 static void locomo_dev_release(struct device *_dev)
0211 {
0212     struct locomo_dev *dev = LOCOMO_DEV(_dev);
0213 
0214     kfree(dev);
0215 }
0216 
0217 static int
0218 locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
0219 {
0220     struct locomo_dev *dev;
0221     int ret;
0222 
0223     dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
0224     if (!dev) {
0225         ret = -ENOMEM;
0226         goto out;
0227     }
0228 
0229     /*
0230      * If the parent device has a DMA mask associated with it,
0231      * propagate it down to the children.
0232      */
0233     if (lchip->dev->dma_mask) {
0234         dev->dma_mask = *lchip->dev->dma_mask;
0235         dev->dev.dma_mask = &dev->dma_mask;
0236     }
0237 
0238     dev_set_name(&dev->dev, "%s", info->name);
0239     dev->devid   = info->devid;
0240     dev->dev.parent  = lchip->dev;
0241     dev->dev.bus     = &locomo_bus_type;
0242     dev->dev.release = locomo_dev_release;
0243     dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
0244 
0245     if (info->offset)
0246         dev->mapbase = lchip->base + info->offset;
0247     else
0248         dev->mapbase = 0;
0249     dev->length = info->length;
0250 
0251     dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
0252             NO_IRQ : lchip->irq_base + info->irq[0];
0253 
0254     ret = device_register(&dev->dev);
0255     if (ret) {
0256  out:
0257         kfree(dev);
0258     }
0259     return ret;
0260 }
0261 
0262 #ifdef CONFIG_PM
0263 
0264 struct locomo_save_data {
0265     u16 LCM_GPO;
0266     u16 LCM_SPICT;
0267     u16 LCM_GPE;
0268     u16 LCM_ASD;
0269     u16 LCM_SPIMD;
0270 };
0271 
0272 static int locomo_suspend(struct platform_device *dev, pm_message_t state)
0273 {
0274     struct locomo *lchip = platform_get_drvdata(dev);
0275     struct locomo_save_data *save;
0276     unsigned long flags;
0277 
0278     save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
0279     if (!save)
0280         return -ENOMEM;
0281 
0282     lchip->saved_state = save;
0283 
0284     spin_lock_irqsave(&lchip->lock, flags);
0285 
0286     save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO); /* GPIO */
0287     locomo_writel(0x00, lchip->base + LOCOMO_GPO);
0288     save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);  /* SPI */
0289     locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
0290     save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE); /* GPIO */
0291     locomo_writel(0x00, lchip->base + LOCOMO_GPE);
0292     save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD); /* ADSTART */
0293     locomo_writel(0x00, lchip->base + LOCOMO_ASD);
0294     save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);  /* SPI */
0295     locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
0296 
0297     locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
0298     locomo_writel(0x00, lchip->base + LOCOMO_DAC);
0299     locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
0300 
0301     if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
0302         locomo_writel(0x00, lchip->base + LOCOMO_C32K);     /* CLK32 off */
0303     else
0304         /* 18MHz already enabled, so no wait */
0305         locomo_writel(0xc1, lchip->base + LOCOMO_C32K);     /* CLK32 on */
0306 
0307     locomo_writel(0x00, lchip->base + LOCOMO_TADC);     /* 18MHz clock off*/
0308     locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);           /* 22MHz/24MHz clock off */
0309     locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);          /* FL */
0310 
0311     spin_unlock_irqrestore(&lchip->lock, flags);
0312 
0313     return 0;
0314 }
0315 
0316 static int locomo_resume(struct platform_device *dev)
0317 {
0318     struct locomo *lchip = platform_get_drvdata(dev);
0319     struct locomo_save_data *save;
0320     unsigned long r;
0321     unsigned long flags;
0322 
0323     save = lchip->saved_state;
0324     if (!save)
0325         return 0;
0326 
0327     spin_lock_irqsave(&lchip->lock, flags);
0328 
0329     locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
0330     locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
0331     locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
0332     locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
0333     locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
0334 
0335     locomo_writel(0x00, lchip->base + LOCOMO_C32K);
0336     locomo_writel(0x90, lchip->base + LOCOMO_TADC);
0337 
0338     locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
0339     r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
0340     r &= 0xFEFF;
0341     locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
0342     locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
0343 
0344     spin_unlock_irqrestore(&lchip->lock, flags);
0345 
0346     lchip->saved_state = NULL;
0347     kfree(save);
0348 
0349     return 0;
0350 }
0351 #endif
0352 
0353 
0354 /**
0355  *  locomo_probe - probe for a single LoCoMo chip.
0356  *  @phys_addr: physical address of device.
0357  *
0358  *  Probe for a LoCoMo chip.  This must be called
0359  *  before any other locomo-specific code.
0360  *
0361  *  Returns:
0362  *  %-ENODEV    device not found.
0363  *  %-EBUSY     physical address already marked in-use.
0364  *  %0      successful.
0365  */
0366 static int
0367 __locomo_probe(struct device *me, struct resource *mem, int irq)
0368 {
0369     struct locomo_platform_data *pdata = me->platform_data;
0370     struct locomo *lchip;
0371     unsigned long r;
0372     int i, ret = -ENODEV;
0373 
0374     lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
0375     if (!lchip)
0376         return -ENOMEM;
0377 
0378     spin_lock_init(&lchip->lock);
0379 
0380     lchip->dev = me;
0381     dev_set_drvdata(lchip->dev, lchip);
0382 
0383     lchip->phys = mem->start;
0384     lchip->irq = irq;
0385     lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
0386 
0387     /*
0388      * Map the whole region.  This also maps the
0389      * registers for our children.
0390      */
0391     lchip->base = ioremap(mem->start, PAGE_SIZE);
0392     if (!lchip->base) {
0393         ret = -ENOMEM;
0394         goto out;
0395     }
0396 
0397     /* locomo initialize */
0398     locomo_writel(0, lchip->base + LOCOMO_ICR);
0399     /* KEYBOARD */
0400     locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
0401 
0402     /* GPIO */
0403     locomo_writel(0, lchip->base + LOCOMO_GPO);
0404     locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
0405             , lchip->base + LOCOMO_GPE);
0406     locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
0407             , lchip->base + LOCOMO_GPD);
0408     locomo_writel(0, lchip->base + LOCOMO_GIE);
0409 
0410     /* Frontlight */
0411     locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
0412     locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
0413 
0414     /* Longtime timer */
0415     locomo_writel(0, lchip->base + LOCOMO_LTINT);
0416     /* SPI */
0417     locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
0418 
0419     locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
0420     r = locomo_readl(lchip->base + LOCOMO_ASD);
0421     r |= 0x8000;
0422     locomo_writel(r, lchip->base + LOCOMO_ASD);
0423 
0424     locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
0425     r = locomo_readl(lchip->base + LOCOMO_HSD);
0426     r |= 0x8000;
0427     locomo_writel(r, lchip->base + LOCOMO_HSD);
0428 
0429     locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
0430 
0431     /* XON */
0432     locomo_writel(0x80, lchip->base + LOCOMO_TADC);
0433     udelay(1000);
0434     /* CLK9MEN */
0435     r = locomo_readl(lchip->base + LOCOMO_TADC);
0436     r |= 0x10;
0437     locomo_writel(r, lchip->base + LOCOMO_TADC);
0438     udelay(100);
0439 
0440     /* init DAC */
0441     r = locomo_readl(lchip->base + LOCOMO_DAC);
0442     r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
0443     locomo_writel(r, lchip->base + LOCOMO_DAC);
0444 
0445     r = locomo_readl(lchip->base + LOCOMO_VER);
0446     printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
0447 
0448     /*
0449      * The interrupt controller must be initialised before any
0450      * other device to ensure that the interrupts are available.
0451      */
0452     if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
0453         locomo_setup_irq(lchip);
0454 
0455     for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
0456         locomo_init_one_child(lchip, &locomo_devices[i]);
0457     return 0;
0458 
0459  out:
0460     kfree(lchip);
0461     return ret;
0462 }
0463 
0464 static int locomo_remove_child(struct device *dev, void *data)
0465 {
0466     device_unregister(dev);
0467     return 0;
0468 } 
0469 
0470 static void __locomo_remove(struct locomo *lchip)
0471 {
0472     device_for_each_child(lchip->dev, NULL, locomo_remove_child);
0473 
0474     if (lchip->irq != NO_IRQ) {
0475         irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
0476     }
0477 
0478     iounmap(lchip->base);
0479     kfree(lchip);
0480 }
0481 
0482 static int locomo_probe(struct platform_device *dev)
0483 {
0484     struct resource *mem;
0485     int irq;
0486 
0487     mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
0488     if (!mem)
0489         return -EINVAL;
0490     irq = platform_get_irq(dev, 0);
0491     if (irq < 0)
0492         return -ENXIO;
0493 
0494     return __locomo_probe(&dev->dev, mem, irq);
0495 }
0496 
0497 static int locomo_remove(struct platform_device *dev)
0498 {
0499     struct locomo *lchip = platform_get_drvdata(dev);
0500 
0501     if (lchip) {
0502         __locomo_remove(lchip);
0503         platform_set_drvdata(dev, NULL);
0504     }
0505 
0506     return 0;
0507 }
0508 
0509 /*
0510  *  Not sure if this should be on the system bus or not yet.
0511  *  We really want some way to register a system device at
0512  *  the per-machine level, and then have this driver pick
0513  *  up the registered devices.
0514  */
0515 static struct platform_driver locomo_device_driver = {
0516     .probe      = locomo_probe,
0517     .remove     = locomo_remove,
0518 #ifdef CONFIG_PM
0519     .suspend    = locomo_suspend,
0520     .resume     = locomo_resume,
0521 #endif
0522     .driver     = {
0523         .name   = "locomo",
0524     },
0525 };
0526 
0527 /*
0528  *  Get the parent device driver (us) structure
0529  *  from a child function device
0530  */
0531 static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
0532 {
0533     return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
0534 }
0535 
0536 void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
0537 {
0538     struct locomo *lchip = dev_get_drvdata(dev);
0539     unsigned long flags;
0540     unsigned int r;
0541 
0542     if (!lchip)
0543         return;
0544 
0545     spin_lock_irqsave(&lchip->lock, flags);
0546 
0547     r = locomo_readl(lchip->base + LOCOMO_GPD);
0548     if (dir)
0549         r |= bits;
0550     else
0551         r &= ~bits;
0552     locomo_writel(r, lchip->base + LOCOMO_GPD);
0553 
0554     r = locomo_readl(lchip->base + LOCOMO_GPE);
0555     if (dir)
0556         r |= bits;
0557     else
0558         r &= ~bits;
0559     locomo_writel(r, lchip->base + LOCOMO_GPE);
0560 
0561     spin_unlock_irqrestore(&lchip->lock, flags);
0562 }
0563 EXPORT_SYMBOL(locomo_gpio_set_dir);
0564 
0565 int locomo_gpio_read_level(struct device *dev, unsigned int bits)
0566 {
0567     struct locomo *lchip = dev_get_drvdata(dev);
0568     unsigned long flags;
0569     unsigned int ret;
0570 
0571     if (!lchip)
0572         return -ENODEV;
0573 
0574     spin_lock_irqsave(&lchip->lock, flags);
0575     ret = locomo_readl(lchip->base + LOCOMO_GPL);
0576     spin_unlock_irqrestore(&lchip->lock, flags);
0577 
0578     ret &= bits;
0579     return ret;
0580 }
0581 EXPORT_SYMBOL(locomo_gpio_read_level);
0582 
0583 int locomo_gpio_read_output(struct device *dev, unsigned int bits)
0584 {
0585     struct locomo *lchip = dev_get_drvdata(dev);
0586     unsigned long flags;
0587     unsigned int ret;
0588 
0589     if (!lchip)
0590         return -ENODEV;
0591 
0592     spin_lock_irqsave(&lchip->lock, flags);
0593     ret = locomo_readl(lchip->base + LOCOMO_GPO);
0594     spin_unlock_irqrestore(&lchip->lock, flags);
0595 
0596     ret &= bits;
0597     return ret;
0598 }
0599 EXPORT_SYMBOL(locomo_gpio_read_output);
0600 
0601 void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
0602 {
0603     struct locomo *lchip = dev_get_drvdata(dev);
0604     unsigned long flags;
0605     unsigned int r;
0606 
0607     if (!lchip)
0608         return;
0609 
0610     spin_lock_irqsave(&lchip->lock, flags);
0611 
0612     r = locomo_readl(lchip->base + LOCOMO_GPO);
0613     if (set)
0614         r |= bits;
0615     else
0616         r &= ~bits;
0617     locomo_writel(r, lchip->base + LOCOMO_GPO);
0618 
0619     spin_unlock_irqrestore(&lchip->lock, flags);
0620 }
0621 EXPORT_SYMBOL(locomo_gpio_write);
0622 
0623 static void locomo_m62332_sendbit(void *mapbase, int bit)
0624 {
0625     unsigned int r;
0626 
0627     r = locomo_readl(mapbase + LOCOMO_DAC);
0628     r &=  ~(LOCOMO_DAC_SCLOEB);
0629     locomo_writel(r, mapbase + LOCOMO_DAC);
0630     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0631     udelay(DAC_DATA_HOLD_TIME); /* 300 nsec */
0632     r = locomo_readl(mapbase + LOCOMO_DAC);
0633     r &=  ~(LOCOMO_DAC_SCLOEB);
0634     locomo_writel(r, mapbase + LOCOMO_DAC);
0635     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0636     udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
0637 
0638     if (bit & 1) {
0639         r = locomo_readl(mapbase + LOCOMO_DAC);
0640         r |=  LOCOMO_DAC_SDAOEB;
0641         locomo_writel(r, mapbase + LOCOMO_DAC);
0642         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0643     } else {
0644         r = locomo_readl(mapbase + LOCOMO_DAC);
0645         r &=  ~(LOCOMO_DAC_SDAOEB);
0646         locomo_writel(r, mapbase + LOCOMO_DAC);
0647         udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0648     }
0649 
0650     udelay(DAC_DATA_SETUP_TIME);    /* 250 nsec */
0651     r = locomo_readl(mapbase + LOCOMO_DAC);
0652     r |=  LOCOMO_DAC_SCLOEB;
0653     locomo_writel(r, mapbase + LOCOMO_DAC);
0654     udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0655     udelay(DAC_SCL_HIGH_HOLD_TIME); /*  4.0 usec */
0656 }
0657 
0658 void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
0659 {
0660     struct locomo *lchip = locomo_chip_driver(ldev);
0661     int i;
0662     unsigned char data;
0663     unsigned int r;
0664     void *mapbase = lchip->base;
0665     unsigned long flags;
0666 
0667     spin_lock_irqsave(&lchip->lock, flags);
0668 
0669     /* Start */
0670     udelay(DAC_BUS_FREE_TIME);  /* 5.0 usec */
0671     r = locomo_readl(mapbase + LOCOMO_DAC);
0672     r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
0673     locomo_writel(r, mapbase + LOCOMO_DAC);
0674     udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0675     udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
0676     r = locomo_readl(mapbase + LOCOMO_DAC);
0677     r &=  ~(LOCOMO_DAC_SDAOEB);
0678     locomo_writel(r, mapbase + LOCOMO_DAC);
0679     udelay(DAC_START_HOLD_TIME);    /* 5.0 usec */
0680     udelay(DAC_DATA_HOLD_TIME); /* 300 nsec */
0681 
0682     /* Send slave address and W bit (LSB is W bit) */
0683     data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
0684     for (i = 1; i <= 8; i++) {
0685         locomo_m62332_sendbit(mapbase, data >> (8 - i));
0686     }
0687 
0688     /* Check A bit */
0689     r = locomo_readl(mapbase + LOCOMO_DAC);
0690     r &=  ~(LOCOMO_DAC_SCLOEB);
0691     locomo_writel(r, mapbase + LOCOMO_DAC);
0692     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0693     udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
0694     r = locomo_readl(mapbase + LOCOMO_DAC);
0695     r &=  ~(LOCOMO_DAC_SDAOEB);
0696     locomo_writel(r, mapbase + LOCOMO_DAC);
0697     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0698     r = locomo_readl(mapbase + LOCOMO_DAC);
0699     r |=  LOCOMO_DAC_SCLOEB;
0700     locomo_writel(r, mapbase + LOCOMO_DAC);
0701     udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0702     udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
0703     if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
0704         printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
0705         goto out;
0706     }
0707 
0708     /* Send Sub address (LSB is channel select) */
0709     /*    channel = 0 : ch1 select              */
0710     /*            = 1 : ch2 select              */
0711     data = M62332_SUB_ADDR + channel;
0712     for (i = 1; i <= 8; i++) {
0713         locomo_m62332_sendbit(mapbase, data >> (8 - i));
0714     }
0715 
0716     /* Check A bit */
0717     r = locomo_readl(mapbase + LOCOMO_DAC);
0718     r &=  ~(LOCOMO_DAC_SCLOEB);
0719     locomo_writel(r, mapbase + LOCOMO_DAC);
0720     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0721     udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
0722     r = locomo_readl(mapbase + LOCOMO_DAC);
0723     r &=  ~(LOCOMO_DAC_SDAOEB);
0724     locomo_writel(r, mapbase + LOCOMO_DAC);
0725     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0726     r = locomo_readl(mapbase + LOCOMO_DAC);
0727     r |=  LOCOMO_DAC_SCLOEB;
0728     locomo_writel(r, mapbase + LOCOMO_DAC);
0729     udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0730     udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
0731     if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
0732         printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
0733         goto out;
0734     }
0735 
0736     /* Send DAC data */
0737     for (i = 1; i <= 8; i++) {
0738         locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
0739     }
0740 
0741     /* Check A bit */
0742     r = locomo_readl(mapbase + LOCOMO_DAC);
0743     r &=  ~(LOCOMO_DAC_SCLOEB);
0744     locomo_writel(r, mapbase + LOCOMO_DAC);
0745     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0746     udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
0747     r = locomo_readl(mapbase + LOCOMO_DAC);
0748     r &=  ~(LOCOMO_DAC_SDAOEB);
0749     locomo_writel(r, mapbase + LOCOMO_DAC);
0750     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0751     r = locomo_readl(mapbase + LOCOMO_DAC);
0752     r |=  LOCOMO_DAC_SCLOEB;
0753     locomo_writel(r, mapbase + LOCOMO_DAC);
0754     udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0755     udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
0756     if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
0757         printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
0758     }
0759 
0760 out:
0761     /* stop */
0762     r = locomo_readl(mapbase + LOCOMO_DAC);
0763     r &=  ~(LOCOMO_DAC_SCLOEB);
0764     locomo_writel(r, mapbase + LOCOMO_DAC);
0765     udelay(DAC_LOW_SETUP_TIME); /* 300 nsec */
0766     udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
0767     r = locomo_readl(mapbase + LOCOMO_DAC);
0768     r |=  LOCOMO_DAC_SCLOEB;
0769     locomo_writel(r, mapbase + LOCOMO_DAC);
0770     udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0771     udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
0772     r = locomo_readl(mapbase + LOCOMO_DAC);
0773     r |=  LOCOMO_DAC_SDAOEB;
0774     locomo_writel(r, mapbase + LOCOMO_DAC);
0775     udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
0776     udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
0777 
0778     r = locomo_readl(mapbase + LOCOMO_DAC);
0779     r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
0780     locomo_writel(r, mapbase + LOCOMO_DAC);
0781     udelay(DAC_LOW_SETUP_TIME); /* 1000 nsec */
0782     udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
0783 
0784     spin_unlock_irqrestore(&lchip->lock, flags);
0785 }
0786 EXPORT_SYMBOL(locomo_m62332_senddata);
0787 
0788 /*
0789  *  Frontlight control
0790  */
0791 
0792 void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
0793 {
0794     unsigned long flags;
0795     struct locomo *lchip = locomo_chip_driver(dev);
0796 
0797     if (vr)
0798         locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
0799     else
0800         locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
0801 
0802     spin_lock_irqsave(&lchip->lock, flags);
0803     locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
0804     udelay(100);
0805     locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
0806     locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
0807     spin_unlock_irqrestore(&lchip->lock, flags);
0808 }
0809 EXPORT_SYMBOL(locomo_frontlight_set);
0810 
0811 /*
0812  *  LoCoMo "Register Access Bus."
0813  *
0814  *  We model this as a regular bus type, and hang devices directly
0815  *  off this.
0816  */
0817 static int locomo_match(struct device *_dev, struct device_driver *_drv)
0818 {
0819     struct locomo_dev *dev = LOCOMO_DEV(_dev);
0820     struct locomo_driver *drv = LOCOMO_DRV(_drv);
0821 
0822     return dev->devid == drv->devid;
0823 }
0824 
0825 static int locomo_bus_probe(struct device *dev)
0826 {
0827     struct locomo_dev *ldev = LOCOMO_DEV(dev);
0828     struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
0829     int ret = -ENODEV;
0830 
0831     if (drv->probe)
0832         ret = drv->probe(ldev);
0833     return ret;
0834 }
0835 
0836 static void locomo_bus_remove(struct device *dev)
0837 {
0838     struct locomo_dev *ldev = LOCOMO_DEV(dev);
0839     struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
0840 
0841     if (drv->remove)
0842         drv->remove(ldev);
0843 }
0844 
0845 struct bus_type locomo_bus_type = {
0846     .name       = "locomo-bus",
0847     .match      = locomo_match,
0848     .probe      = locomo_bus_probe,
0849     .remove     = locomo_bus_remove,
0850 };
0851 
0852 int locomo_driver_register(struct locomo_driver *driver)
0853 {
0854     driver->drv.bus = &locomo_bus_type;
0855     return driver_register(&driver->drv);
0856 }
0857 EXPORT_SYMBOL(locomo_driver_register);
0858 
0859 void locomo_driver_unregister(struct locomo_driver *driver)
0860 {
0861     driver_unregister(&driver->drv);
0862 }
0863 EXPORT_SYMBOL(locomo_driver_unregister);
0864 
0865 static int __init locomo_init(void)
0866 {
0867     int ret = bus_register(&locomo_bus_type);
0868     if (ret == 0)
0869         platform_driver_register(&locomo_device_driver);
0870     return ret;
0871 }
0872 
0873 static void __exit locomo_exit(void)
0874 {
0875     platform_driver_unregister(&locomo_device_driver);
0876     bus_unregister(&locomo_bus_type);
0877 }
0878 
0879 module_init(locomo_init);
0880 module_exit(locomo_exit);
0881 
0882 MODULE_DESCRIPTION("Sharp LoCoMo core driver");
0883 MODULE_LICENSE("GPL");
0884 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
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