locomo.c

底层驱动开发

{
	void *mapbase = get_irq_chipdata(irq);
	unsigned int r;
	r = locomo_readl(mapbase + LOCOMO_SPIWE);
	r |= (0x0001 << (irq - LOCOMO_IRQ_SPI_START));
	locomo_writel(r, mapbase + LOCOMO_SPIWE);

	r = locomo_readl(mapbase + LOCOMO_SPIIS);
	r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
	locomo_writel(r, mapbase + LOCOMO_SPIIS);

	r = locomo_readl(mapbase + LOCOMO_SPIWE);
	r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
	locomo_writel(r, mapbase + LOCOMO_SPIWE);
}

static void locomo_spi_mask_irq(unsigned int irq)
{
	void *mapbase = get_irq_chipdata(irq);
	unsigned int r;
	r = locomo_readl(mapbase + LOCOMO_SPIIE);
	r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
	locomo_writel(r, mapbase + LOCOMO_SPIIE);
}

static void locomo_spi_unmask_irq(unsigned int irq)
{
	void *mapbase = get_irq_chipdata(irq);
	unsigned int r;
	r = locomo_readl(mapbase + LOCOMO_SPIIE);
	r |= (0x0001 << (irq - LOCOMO_IRQ_SPI_START));
	locomo_writel(r, mapbase + LOCOMO_SPIIE);
}

static struct irqchip locomo_spi_chip = {
	.ack	= locomo_spi_ack_irq,
	.mask	= locomo_spi_mask_irq,
	.unmask	= locomo_spi_unmask_irq,
};

static void locomo_setup_irq(struct locomo *lchip)
{
	int irq;
	void *irqbase = lchip->base;

	/*
	 * Install handler for IRQ_LOCOMO_HW.
	 */
	set_irq_type(lchip->irq, IRQT_FALLING);
	set_irq_chipdata(lchip->irq, irqbase);
	set_irq_chained_handler(lchip->irq, locomo_handler);

	/* Install handlers for IRQ_LOCOMO_*_BASE */
	set_irq_chip(IRQ_LOCOMO_KEY_BASE, &locomo_chip);
	set_irq_chipdata(IRQ_LOCOMO_KEY_BASE, irqbase);
	set_irq_chained_handler(IRQ_LOCOMO_KEY_BASE, locomo_key_handler);
	set_irq_flags(IRQ_LOCOMO_KEY_BASE, IRQF_VALID | IRQF_PROBE);

	set_irq_chip(IRQ_LOCOMO_GPIO_BASE, &locomo_chip);
	set_irq_chipdata(IRQ_LOCOMO_GPIO_BASE, irqbase);
	set_irq_chained_handler(IRQ_LOCOMO_GPIO_BASE, locomo_gpio_handler);
	set_irq_flags(IRQ_LOCOMO_GPIO_BASE, IRQF_VALID | IRQF_PROBE);

	set_irq_chip(IRQ_LOCOMO_LT_BASE, &locomo_chip);
	set_irq_chipdata(IRQ_LOCOMO_LT_BASE, irqbase);
	set_irq_chained_handler(IRQ_LOCOMO_LT_BASE, locomo_lt_handler);
	set_irq_flags(IRQ_LOCOMO_LT_BASE, IRQF_VALID | IRQF_PROBE);

	set_irq_chip(IRQ_LOCOMO_SPI_BASE, &locomo_chip);
	set_irq_chipdata(IRQ_LOCOMO_SPI_BASE, irqbase);
	set_irq_chained_handler(IRQ_LOCOMO_SPI_BASE, locomo_spi_handler);
	set_irq_flags(IRQ_LOCOMO_SPI_BASE, IRQF_VALID | IRQF_PROBE);

	/* install handlers for IRQ_LOCOMO_KEY_BASE generated interrupts */
	set_irq_chip(LOCOMO_IRQ_KEY_START, &locomo_key_chip);
	set_irq_chipdata(LOCOMO_IRQ_KEY_START, irqbase);
	set_irq_handler(LOCOMO_IRQ_KEY_START, do_edge_IRQ);
	set_irq_flags(LOCOMO_IRQ_KEY_START, IRQF_VALID | IRQF_PROBE);

	/* install handlers for IRQ_LOCOMO_GPIO_BASE generated interrupts */
	for (irq = LOCOMO_IRQ_GPIO_START; irq < LOCOMO_IRQ_GPIO_START + 16; irq++) {
		set_irq_chip(irq, &locomo_gpio_chip);
		set_irq_chipdata(irq, irqbase);
		set_irq_handler(irq, do_edge_IRQ);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}

	/* install handlers for IRQ_LOCOMO_LT_BASE generated interrupts */
	set_irq_chip(LOCOMO_IRQ_LT_START, &locomo_lt_chip);
	set_irq_chipdata(LOCOMO_IRQ_LT_START, irqbase);
	set_irq_handler(LOCOMO_IRQ_LT_START, do_edge_IRQ);
	set_irq_flags(LOCOMO_IRQ_LT_START, IRQF_VALID | IRQF_PROBE);

	/* install handlers for IRQ_LOCOMO_SPI_BASE generated interrupts */
	for (irq = LOCOMO_IRQ_SPI_START; irq < LOCOMO_IRQ_SPI_START + 3; irq++) {
		set_irq_chip(irq, &locomo_spi_chip);
		set_irq_chipdata(irq, irqbase);
		set_irq_handler(irq, do_edge_IRQ);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}
}


static void locomo_dev_release(struct device *_dev)
{
	struct locomo_dev *dev = LOCOMO_DEV(_dev);

	kfree(dev);
}

static int
locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
{
	struct locomo_dev *dev;
	int ret;

	dev = kmalloc(sizeof(struct locomo_dev), GFP_KERNEL);
	if (!dev) {
		ret = -ENOMEM;
		goto out;
	}
	memset(dev, 0, sizeof(struct locomo_dev));

	strncpy(dev->dev.bus_id,info->name,sizeof(dev->dev.bus_id));
	/*
	 * If the parent device has a DMA mask associated with it,
	 * propagate it down to the children.
	 */
	if (lchip->dev->dma_mask) {
		dev->dma_mask = *lchip->dev->dma_mask;
		dev->dev.dma_mask = &dev->dma_mask;
	}

	dev->devid	 = info->devid;
	dev->dev.parent  = lchip->dev;
	dev->dev.bus     = &locomo_bus_type;
	dev->dev.release = locomo_dev_release;
	dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;

	if (info->offset)
		dev->mapbase = lchip->base + info->offset;
	else
		dev->mapbase = 0;
	dev->length = info->length;

	memmove(dev->irq, info->irq, sizeof(dev->irq));

	ret = device_register(&dev->dev);
	if (ret) {
 out:
		kfree(dev);
	}
	return ret;
}

#ifdef CONFIG_PM

struct locomo_save_data {
	u16	LCM_GPO;
	u16	LCM_SPICT;
	u16	LCM_GPE;
	u16	LCM_ASD;
	u16	LCM_SPIMD;
};

static int locomo_suspend(struct device *dev, pm_message_t state, u32 level)
{
	struct locomo *lchip = dev_get_drvdata(dev);
	struct locomo_save_data *save;
	unsigned long flags;

	if (level != SUSPEND_DISABLE)
		return 0;

	save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
	if (!save)
		return -ENOMEM;

	dev->power.saved_state = (void *) save;

	spin_lock_irqsave(&lchip->lock, flags);

	save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);	/* GPIO */
	locomo_writel(0x00, lchip->base + LOCOMO_GPO);
	save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPICT);	/* SPI */
	locomo_writel(0x40, lchip->base + LOCOMO_SPICT);
	save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);	/* GPIO */
	locomo_writel(0x00, lchip->base + LOCOMO_GPE);
	save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);	/* ADSTART */
	locomo_writel(0x00, lchip->base + LOCOMO_ASD);
	save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPIMD);	/* SPI */
	locomo_writel(0x3C14, lchip->base + LOCOMO_SPIMD);

	locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
	locomo_writel(0x00, lchip->base + LOCOMO_DAC);
	locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);

	if ( (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88) )
		locomo_writel(0x00, lchip->base + LOCOMO_C32K); 	/* CLK32 off */
	else
		/* 18MHz already enabled, so no wait */
		locomo_writel(0xc1, lchip->base + LOCOMO_C32K); 	/* CLK32 on */

	locomo_writel(0x00, lchip->base + LOCOMO_TADC);		/* 18MHz clock off*/
	locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);			/* 22MHz/24MHz clock off */
	locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);			/* FL */

	spin_unlock_irqrestore(&lchip->lock, flags);

	return 0;
}

static int locomo_resume(struct device *dev, u32 level)
{
	struct locomo *lchip = dev_get_drvdata(dev);
	struct locomo_save_data *save;
	unsigned long r;
	unsigned long flags;
	
	if (level != RESUME_ENABLE)
		return 0;

	save = (struct locomo_save_data *) dev->power.saved_state;
	if (!save)
		return 0;

	spin_lock_irqsave(&lchip->lock, flags);

	locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
	locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPICT);
	locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
	locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
	locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPIMD);

	locomo_writel(0x00, lchip->base + LOCOMO_C32K);
	locomo_writel(0x90, lchip->base + LOCOMO_TADC);

	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
	r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
	r &= 0xFEFF;
	locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
	locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);

	spin_unlock_irqrestore(&lchip->lock, flags);

	dev->power.saved_state = NULL;
	kfree(save);

	return 0;
}
#endif

/**
 *	locomo_probe - probe for a single LoCoMo chip.
 *	@phys_addr: physical address of device.
 *
 *	Probe for a LoCoMo chip.  This must be called
 *	before any other locomo-specific code.
 *
 *	Returns:
 *	%-ENODEV	device not found.
 *	%-EBUSY		physical address already marked in-use.
 *	%0		successful.
 */
static int
__locomo_probe(struct device *me, struct resource *mem, int irq)
{
	struct locomo *lchip;
	unsigned long r;
	int i, ret = -ENODEV;

	lchip = kmalloc(sizeof(struct locomo), GFP_KERNEL);
	if (!lchip)
		return -ENOMEM;

	memset(lchip, 0, sizeof(struct locomo));

	spin_lock_init(&lchip->lock);

	lchip->dev = me;
	dev_set_drvdata(lchip->dev, lchip);

	lchip->phys = mem->start;
	lchip->irq = irq;

	/*
	 * Map the whole region.  This also maps the
	 * registers for our children.
	 */
	lchip->base = ioremap(mem->start, PAGE_SIZE);
	if (!lchip->base) {
		ret = -ENOMEM;
		goto out;
	}

	/* locomo initialize */
	locomo_writel(0, lchip->base + LOCOMO_ICR);
	/* KEYBOARD */
	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);

	/* GPIO */
	locomo_writel(0, lchip->base + LOCOMO_GPO);
	locomo_writel( (LOCOMO_GPIO(2) | LOCOMO_GPIO(3) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
			, lchip->base + LOCOMO_GPE);
	locomo_writel( (LOCOMO_GPIO(2) | LOCOMO_GPIO(3) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
			, lchip->base + LOCOMO_GPD);
	locomo_writel(0, lchip->base + LOCOMO_GIE);

	/* FrontLight */
	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
	/* Longtime timer */
	locomo_writel(0, lchip->base + LOCOMO_LTINT);
	/* SPI */
	locomo_writel(0, lchip->base + LOCOMO_SPIIE);

	locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
	r = locomo_readl(lchip->base + LOCOMO_ASD);
	r |= 0x8000;
	locomo_writel(r, lchip->base + LOCOMO_ASD);

	locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
	r = locomo_readl(lchip->base + LOCOMO_HSD);
	r |= 0x8000;
	locomo_writel(r, lchip->base + LOCOMO_HSD);

	locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);

	/* XON */
	locomo_writel(0x80, lchip->base + LOCOMO_TADC);
	udelay(1000);
	/* CLK9MEN */
	r = locomo_readl(lchip->base + LOCOMO_TADC);
	r |= 0x10;
	locomo_writel(r, lchip->base + LOCOMO_TADC);
	udelay(100);

	/* init DAC */
	r = locomo_readl(lchip->base + LOCOMO_DAC);
	r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
	locomo_writel(r, lchip->base + LOCOMO_DAC);

	r = locomo_readl(lchip->base + LOCOMO_VER);
	printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));

	/*
	 * The interrupt controller must be initialised before any
	 * other device to ensure that the interrupts are available.
	 */
	if (lchip->irq != NO_IRQ)
		locomo_setup_irq(lchip);

	for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
		locomo_init_one_child(lchip, &locomo_devices[i]);

	return 0;

 out:
	kfree(lchip);
	return ret;
}

static int locomo_remove_child(struct device *dev, void *data)
{
	device_unregister(dev);
	return 0;
} 

static void __locomo_remove(struct locomo *lchip)
{
	device_for_each_child(lchip->dev, NULL, locomo_remove_child);

	if (lchip->irq != NO_IRQ) {
		set_irq_chained_handler(lchip->irq, NULL);
		set_irq_data(lchip->irq, NULL);
	}

	iounmap(lchip->base);
	kfree(lchip);
}

static int locomo_probe(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct resource *mem;
	int irq;