sa1111.c

linux-2.6.15.6

 *	@dev: device to restore
 *
 *	Restore the general state of the SA1111; clock control and
 *	interrupt controller.  Other parts of the SA1111 must be
 *	restored by their respective drivers, and must be called
 *	via LDM after this function.
 */
static int sa1111_resume(struct platform_device *dev)
{
	struct sa1111 *sachip = platform_get_drvdata(dev);
	struct sa1111_save_data *save;
	unsigned long flags, id;
	void __iomem *base;

	save = (struct sa1111_save_data *)dev->dev.power.saved_state;
	if (!save)
		return 0;

	spin_lock_irqsave(&sachip->lock, flags);

	/*
	 * Ensure that the SA1111 is still here.
	 * FIXME: shouldn't do this here.
	 */
	id = sa1111_readl(sachip->base + SA1111_SKID);
	if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
		__sa1111_remove(sachip);
		platform_set_drvdata(dev, NULL);
		kfree(save);
		return 0;
	}

	/*
	 * First of all, wake up the chip.
	 */
	sa1111_wake(sachip);
	sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN0);
	sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN1);

	base = sachip->base;
	sa1111_writel(save->skcr,     base + SA1111_SKCR);
	sa1111_writel(save->skpcr,    base + SA1111_SKPCR);
	sa1111_writel(save->skcdr,    base + SA1111_SKCDR);
	sa1111_writel(save->skaud,    base + SA1111_SKAUD);
	sa1111_writel(save->skpwm0,   base + SA1111_SKPWM0);
	sa1111_writel(save->skpwm1,   base + SA1111_SKPWM1);

	base = sachip->base + SA1111_INTC;
	sa1111_writel(save->intpol0,  base + SA1111_INTPOL0);
	sa1111_writel(save->intpol1,  base + SA1111_INTPOL1);
	sa1111_writel(save->inten0,   base + SA1111_INTEN0);
	sa1111_writel(save->inten1,   base + SA1111_INTEN1);
	sa1111_writel(save->wakepol0, base + SA1111_WAKEPOL0);
	sa1111_writel(save->wakepol1, base + SA1111_WAKEPOL1);
	sa1111_writel(save->wakeen0,  base + SA1111_WAKEEN0);
	sa1111_writel(save->wakeen1,  base + SA1111_WAKEEN1);

	spin_unlock_irqrestore(&sachip->lock, flags);

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

	return 0;
}

#else
#define sa1111_suspend NULL
#define sa1111_resume  NULL
#endif

static int sa1111_probe(struct platform_device *pdev)
{
	struct resource *mem;
	int irq;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem)
		return -EINVAL;
	irq = platform_get_irq(pdev, 0);

	return __sa1111_probe(&pdev->dev, mem, irq);
}

static int sa1111_remove(struct platform_device *pdev)
{
	struct sa1111 *sachip = platform_get_drvdata(pdev);

	if (sachip) {
		__sa1111_remove(sachip);
		platform_set_drvdata(pdev, NULL);

#ifdef CONFIG_PM
		kfree(pdev->dev.power.saved_state);
		pdev->dev.power.saved_state = NULL;
#endif
	}

	return 0;
}

/*
 *	Not sure if this should be on the system bus or not yet.
 *	We really want some way to register a system device at
 *	the per-machine level, and then have this driver pick
 *	up the registered devices.
 *
 *	We also need to handle the SDRAM configuration for
 *	PXA250/SA1110 machine classes.
 */
static struct platform_driver sa1111_device_driver = {
	.probe		= sa1111_probe,
	.remove		= sa1111_remove,
	.suspend	= sa1111_suspend,
	.resume		= sa1111_resume,
	.driver		= {
		.name	= "sa1111",
	},
};

/*
 *	Get the parent device driver (us) structure
 *	from a child function device
 */
static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev)
{
	return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent);
}

/*
 * The bits in the opdiv field are non-linear.
 */
static unsigned char opdiv_table[] = { 1, 4, 2, 8 };

static unsigned int __sa1111_pll_clock(struct sa1111 *sachip)
{
	unsigned int skcdr, fbdiv, ipdiv, opdiv;

	skcdr = sa1111_readl(sachip->base + SA1111_SKCDR);

	fbdiv = (skcdr & 0x007f) + 2;
	ipdiv = ((skcdr & 0x0f80) >> 7) + 2;
	opdiv = opdiv_table[(skcdr & 0x3000) >> 12];

	return 3686400 * fbdiv / (ipdiv * opdiv);
}

/**
 *	sa1111_pll_clock - return the current PLL clock frequency.
 *	@sadev: SA1111 function block
 *
 *	BUG: we should look at SKCR.  We also blindly believe that
 *	the chip is being fed with the 3.6864MHz clock.
 *
 *	Returns the PLL clock in Hz.
 */
unsigned int sa1111_pll_clock(struct sa1111_dev *sadev)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);

	return __sa1111_pll_clock(sachip);
}

/**
 *	sa1111_select_audio_mode - select I2S or AC link mode
 *	@sadev: SA1111 function block
 *	@mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S
 *
 *	Frob the SKCR to select AC Link mode or I2S mode for
 *	the audio block.
 */
void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned long flags;
	unsigned int val;

	spin_lock_irqsave(&sachip->lock, flags);

	val = sa1111_readl(sachip->base + SA1111_SKCR);
	if (mode == SA1111_AUDIO_I2S) {
		val &= ~SKCR_SELAC;
	} else {
		val |= SKCR_SELAC;
	}
	sa1111_writel(val, sachip->base + SA1111_SKCR);

	spin_unlock_irqrestore(&sachip->lock, flags);
}

/**
 *	sa1111_set_audio_rate - set the audio sample rate
 *	@sadev: SA1111 SAC function block
 *	@rate: sample rate to select
 */
int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned int div;

	if (sadev->devid != SA1111_DEVID_SAC)
		return -EINVAL;

	div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate;
	if (div == 0)
		div = 1;
	if (div > 128)
		div = 128;

	sa1111_writel(div - 1, sachip->base + SA1111_SKAUD);

	return 0;
}

/**
 *	sa1111_get_audio_rate - get the audio sample rate
 *	@sadev: SA1111 SAC function block device
 */
int sa1111_get_audio_rate(struct sa1111_dev *sadev)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned long div;

	if (sadev->devid != SA1111_DEVID_SAC)
		return -EINVAL;

	div = sa1111_readl(sachip->base + SA1111_SKAUD) + 1;

	return __sa1111_pll_clock(sachip) / (256 * div);
}

void sa1111_set_io_dir(struct sa1111_dev *sadev,
		       unsigned int bits, unsigned int dir,
		       unsigned int sleep_dir)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned long flags;
	unsigned int val;
	void __iomem *gpio = sachip->base + SA1111_GPIO;

#define MODIFY_BITS(port, mask, dir)		\
	if (mask) {				\
		val = sa1111_readl(port);	\
		val &= ~(mask);			\
		val |= (dir) & (mask);		\
		sa1111_writel(val, port);	\
	}

	spin_lock_irqsave(&sachip->lock, flags);
	MODIFY_BITS(gpio + SA1111_GPIO_PADDR, bits & 15, dir);
	MODIFY_BITS(gpio + SA1111_GPIO_PBDDR, (bits >> 8) & 255, dir >> 8);
	MODIFY_BITS(gpio + SA1111_GPIO_PCDDR, (bits >> 16) & 255, dir >> 16);

	MODIFY_BITS(gpio + SA1111_GPIO_PASDR, bits & 15, sleep_dir);
	MODIFY_BITS(gpio + SA1111_GPIO_PBSDR, (bits >> 8) & 255, sleep_dir >> 8);
	MODIFY_BITS(gpio + SA1111_GPIO_PCSDR, (bits >> 16) & 255, sleep_dir >> 16);
	spin_unlock_irqrestore(&sachip->lock, flags);
}

void sa1111_set_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned long flags;
	unsigned int val;
	void __iomem *gpio = sachip->base + SA1111_GPIO;

	spin_lock_irqsave(&sachip->lock, flags);
	MODIFY_BITS(gpio + SA1111_GPIO_PADWR, bits & 15, v);
	MODIFY_BITS(gpio + SA1111_GPIO_PBDWR, (bits >> 8) & 255, v >> 8);
	MODIFY_BITS(gpio + SA1111_GPIO_PCDWR, (bits >> 16) & 255, v >> 16);
	spin_unlock_irqrestore(&sachip->lock, flags);
}

void sa1111_set_sleep_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned long flags;
	unsigned int val;
	void __iomem *gpio = sachip->base + SA1111_GPIO;

	spin_lock_irqsave(&sachip->lock, flags);
	MODIFY_BITS(gpio + SA1111_GPIO_PASSR, bits & 15, v);
	MODIFY_BITS(gpio + SA1111_GPIO_PBSSR, (bits >> 8) & 255, v >> 8);
	MODIFY_BITS(gpio + SA1111_GPIO_PCSSR, (bits >> 16) & 255, v >> 16);
	spin_unlock_irqrestore(&sachip->lock, flags);
}

/*
 * Individual device operations.
 */

/**
 *	sa1111_enable_device - enable an on-chip SA1111 function block
 *	@sadev: SA1111 function block device to enable
 */
void sa1111_enable_device(struct sa1111_dev *sadev)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned long flags;
	unsigned int val;

	spin_lock_irqsave(&sachip->lock, flags);
	val = sa1111_readl(sachip->base + SA1111_SKPCR);
	sa1111_writel(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
	spin_unlock_irqrestore(&sachip->lock, flags);
}

/**
 *	sa1111_disable_device - disable an on-chip SA1111 function block
 *	@sadev: SA1111 function block device to disable
 */
void sa1111_disable_device(struct sa1111_dev *sadev)
{
	struct sa1111 *sachip = sa1111_chip_driver(sadev);
	unsigned long flags;
	unsigned int val;

	spin_lock_irqsave(&sachip->lock, flags);
	val = sa1111_readl(sachip->base + SA1111_SKPCR);
	sa1111_writel(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
	spin_unlock_irqrestore(&sachip->lock, flags);
}

/*
 *	SA1111 "Register Access Bus."
 *
 *	We model this as a regular bus type, and hang devices directly
 *	off this.
 */
static int sa1111_match(struct device *_dev, struct device_driver *_drv)
{
	struct sa1111_dev *dev = SA1111_DEV(_dev);
	struct sa1111_driver *drv = SA1111_DRV(_drv);

	return dev->devid == drv->devid;
}

static int sa1111_bus_suspend(struct device *dev, pm_message_t state)
{
	struct sa1111_dev *sadev = SA1111_DEV(dev);
	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
	int ret = 0;

	if (drv && drv->suspend)
		ret = drv->suspend(sadev, state);
	return ret;
}

static int sa1111_bus_resume(struct device *dev)
{
	struct sa1111_dev *sadev = SA1111_DEV(dev);
	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
	int ret = 0;

	if (drv && drv->resume)
		ret = drv->resume(sadev);
	return ret;
}

static int sa1111_bus_probe(struct device *dev)
{
	struct sa1111_dev *sadev = SA1111_DEV(dev);
	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
	int ret = -ENODEV;

	if (drv->probe)
		ret = drv->probe(sadev);
	return ret;
}

static int sa1111_bus_remove(struct device *dev)
{
	struct sa1111_dev *sadev = SA1111_DEV(dev);
	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
	int ret = 0;

	if (drv->remove)
		ret = drv->remove(sadev);
	return ret;
}

struct bus_type sa1111_bus_type = {
	.name		= "sa1111-rab",
	.match		= sa1111_match,
	.suspend	= sa1111_bus_suspend,
	.resume		= sa1111_bus_resume,
};

int sa1111_driver_register(struct sa1111_driver *driver)
{
	driver->drv.probe = sa1111_bus_probe;
	driver->drv.remove = sa1111_bus_remove;
	driver->drv.bus = &sa1111_bus_type;
	return driver_register(&driver->drv);
}

void sa1111_driver_unregister(struct sa1111_driver *driver)
{
	driver_unregister(&driver->drv);
}

static int __init sa1111_init(void)
{
	int ret = bus_register(&sa1111_bus_type);
	if (ret == 0)
		platform_driver_register(&sa1111_device_driver);
	return ret;
}

static void __exit sa1111_exit(void)
{
	platform_driver_unregister(&sa1111_device_driver);
	bus_unregister(&sa1111_bus_type);
}

subsys_initcall(sa1111_init);
module_exit(sa1111_exit);

MODULE_DESCRIPTION("Intel Corporation SA1111 core driver");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(sa1111_select_audio_mode);
EXPORT_SYMBOL(sa1111_set_audio_rate);
EXPORT_SYMBOL(sa1111_get_audio_rate);
EXPORT_SYMBOL(sa1111_set_io_dir);
EXPORT_SYMBOL(sa1111_set_io);
EXPORT_SYMBOL(sa1111_set_sleep_io);
EXPORT_SYMBOL(sa1111_enable_device);
EXPORT_SYMBOL(sa1111_disable_device);
EXPORT_SYMBOL(sa1111_pll_clock);
EXPORT_SYMBOL(sa1111_bus_type);
EXPORT_SYMBOL(sa1111_driver_register);
EXPORT_SYMBOL(sa1111_driver_unregister);