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Commit 3f9ae379 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge back earlier 'acpi-lpss' material for v3.18.

parents fe82dcec 1f47a77c

drivers/acpi/acpi_lpss.c

+58 −109
Original line number Diff line number Diff line
@@ -54,55 +54,58 @@ ACPI_MODULE_NAME("acpi_lpss"); 


#define LPSS_PRV_REG_COUNT		9



struct lpss_shared_clock {

	const char *name;

	unsigned long rate;

	struct clk *clk;

};

/* LPSS Flags */

#define LPSS_CLK			BIT(0)

#define LPSS_CLK_GATE			BIT(1)

#define LPSS_CLK_DIVIDER		BIT(2)

#define LPSS_LTR			BIT(3)

#define LPSS_SAVE_CTX			BIT(4)



struct lpss_private_data;



struct lpss_device_desc {

	bool clk_required;

	const char *clkdev_name;

	bool ltr_required;

	unsigned int flags;

	unsigned int prv_offset;

	size_t prv_size_override;

	bool clk_divider;

	bool clk_gate;

	bool save_ctx;

	struct lpss_shared_clock *shared_clock;

	void (*setup)(struct lpss_private_data *pdata);

};



static struct lpss_device_desc lpss_dma_desc = {

	.clk_required = true,

	.clkdev_name = "hclk",

	.flags = LPSS_CLK,

};



struct lpss_private_data {

	void __iomem *mmio_base;

	resource_size_t mmio_size;

	unsigned int fixed_clk_rate;

	struct clk *clk;

	const struct lpss_device_desc *dev_desc;

	u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];

};



/* UART Component Parameter Register */

#define LPSS_UART_CPR			0xF4

#define LPSS_UART_CPR_AFCE		BIT(4)



static void lpss_uart_setup(struct lpss_private_data *pdata)

{

	unsigned int offset;

	u32 reg;

	u32 val;



	offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;

	reg = readl(pdata->mmio_base + offset);

	writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + offset);

	val = readl(pdata->mmio_base + offset);

	writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);



	val = readl(pdata->mmio_base + LPSS_UART_CPR);

	if (!(val & LPSS_UART_CPR_AFCE)) {

		offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;

	reg = readl(pdata->mmio_base + offset);

	writel(reg | LPSS_GENERAL_UART_RTS_OVRD, pdata->mmio_base + offset);

		val = readl(pdata->mmio_base + offset);

		val |= LPSS_GENERAL_UART_RTS_OVRD;

		writel(val, pdata->mmio_base + offset);

	}

}



static void lpss_i2c_setup(struct lpss_private_data *pdata)

static void byt_i2c_setup(struct lpss_private_data *pdata)

{

	unsigned int offset;

	u32 val;
@@ -111,100 +114,56 @@ static void lpss_i2c_setup(struct lpss_private_data *pdata) 
	val = readl(pdata->mmio_base + offset);

	val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;

	writel(val, pdata->mmio_base + offset);

}



static struct lpss_device_desc wpt_dev_desc = {

	.clk_required = true,

	.prv_offset = 0x800,

	.ltr_required = true,

	.clk_divider = true,

	.clk_gate = true,

};

	if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))

		pdata->fixed_clk_rate = 133000000;

}



static struct lpss_device_desc lpt_dev_desc = {

	.clk_required = true,

	.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,

	.prv_offset = 0x800,

	.ltr_required = true,

	.clk_divider = true,

	.clk_gate = true,

};



static struct lpss_device_desc lpt_i2c_dev_desc = {

	.clk_required = true,

	.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR,

	.prv_offset = 0x800,

	.ltr_required = true,

	.clk_gate = true,

};



static struct lpss_device_desc lpt_uart_dev_desc = {

	.clk_required = true,

	.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,

	.prv_offset = 0x800,

	.ltr_required = true,

	.clk_divider = true,

	.clk_gate = true,

	.setup = lpss_uart_setup,

};



static struct lpss_device_desc lpt_sdio_dev_desc = {

	.flags = LPSS_LTR,

	.prv_offset = 0x1000,

	.prv_size_override = 0x1018,

	.ltr_required = true,

};



static struct lpss_shared_clock pwm_clock = {

	.name = "pwm_clk",

	.rate = 25000000,

};



static struct lpss_device_desc byt_pwm_dev_desc = {

	.clk_required = true,

	.save_ctx = true,

	.shared_clock = &pwm_clock,

	.flags = LPSS_SAVE_CTX,

};



static struct lpss_device_desc byt_uart_dev_desc = {

	.clk_required = true,

	.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,

	.prv_offset = 0x800,

	.clk_divider = true,

	.clk_gate = true,

	.save_ctx = true,

	.setup = lpss_uart_setup,

};



static struct lpss_device_desc byt_spi_dev_desc = {

	.clk_required = true,

	.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,

	.prv_offset = 0x400,

	.clk_divider = true,

	.clk_gate = true,

	.save_ctx = true,

};



static struct lpss_device_desc byt_sdio_dev_desc = {

	.clk_required = true,

};



static struct lpss_shared_clock i2c_clock = {

	.name = "i2c_clk",

	.rate = 100000000,

	.flags = LPSS_CLK,

};



static struct lpss_device_desc byt_i2c_dev_desc = {

	.clk_required = true,

	.flags = LPSS_CLK | LPSS_SAVE_CTX,

	.prv_offset = 0x800,

	.save_ctx = true,

	.shared_clock = &i2c_clock,

	.setup = lpss_i2c_setup,

};



static struct lpss_shared_clock bsw_pwm_clock = {

	.name = "pwm_clk",

	.rate = 19200000,

};



static struct lpss_device_desc bsw_pwm_dev_desc = {

	.clk_required = true,

	.save_ctx = true,

	.shared_clock = &bsw_pwm_clock,

	.setup = byt_i2c_setup,

};



#else
@@ -237,7 +196,7 @@ static const struct acpi_device_id acpi_lpss_device_ids[] = { 
	{ "INT33FC", },



	/* Braswell LPSS devices */

	{ "80862288", LPSS_ADDR(bsw_pwm_dev_desc) },

	{ "80862288", LPSS_ADDR(byt_pwm_dev_desc) },

	{ "8086228A", LPSS_ADDR(byt_uart_dev_desc) },

	{ "8086228E", LPSS_ADDR(byt_spi_dev_desc) },

	{ "808622C1", LPSS_ADDR(byt_i2c_dev_desc) },
@@ -251,7 +210,8 @@ static const struct acpi_device_id acpi_lpss_device_ids[] = { 
	{ "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },

	{ "INT3437", },



	{ "INT3438", LPSS_ADDR(wpt_dev_desc) },

	/* Wildcat Point LPSS devices */

	{ "INT3438", LPSS_ADDR(lpt_dev_desc) },



	{ }

};
@@ -276,7 +236,6 @@ static int register_device_clock(struct acpi_device *adev, 
				 struct lpss_private_data *pdata)

{

	const struct lpss_device_desc *dev_desc = pdata->dev_desc;

	struct lpss_shared_clock *shared_clock = dev_desc->shared_clock;

	const char *devname = dev_name(&adev->dev);

	struct clk *clk = ERR_PTR(-ENODEV);

	struct lpss_clk_data *clk_data;
@@ -289,12 +248,7 @@ static int register_device_clock(struct acpi_device *adev, 
	clk_data = platform_get_drvdata(lpss_clk_dev);

	if (!clk_data)

		return -ENODEV;



	if (dev_desc->clkdev_name) {

		clk_register_clkdev(clk_data->clk, dev_desc->clkdev_name,

				    devname);

		return 0;

	}

	clk = clk_data->clk;



	if (!pdata->mmio_base

	    || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
@@ -303,24 +257,19 @@ static int register_device_clock(struct acpi_device *adev, 
	parent = clk_data->name;

	prv_base = pdata->mmio_base + dev_desc->prv_offset;



	if (shared_clock) {

		clk = shared_clock->clk;

		if (!clk) {

			clk = clk_register_fixed_rate(NULL, shared_clock->name,

						      "lpss_clk", 0,

						      shared_clock->rate);

			shared_clock->clk = clk;

		}

		parent = shared_clock->name;

	if (pdata->fixed_clk_rate) {

		clk = clk_register_fixed_rate(NULL, devname, parent, 0,

					      pdata->fixed_clk_rate);

		goto out;

	}



	if (dev_desc->clk_gate) {

	if (dev_desc->flags & LPSS_CLK_GATE) {

		clk = clk_register_gate(NULL, devname, parent, 0,

					prv_base, 0, 0, NULL);

		parent = devname;

	}



	if (dev_desc->clk_divider) {

	if (dev_desc->flags & LPSS_CLK_DIVIDER) {

		/* Prevent division by zero */

		if (!readl(prv_base))

			writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
@@ -344,7 +293,7 @@ static int register_device_clock(struct acpi_device *adev, 
		kfree(parent);

		kfree(clk_name);

	}



out:

	if (IS_ERR(clk))

		return PTR_ERR(clk);
@@ -392,7 +341,10 @@ static int acpi_lpss_create_device(struct acpi_device *adev, 


	pdata->dev_desc = dev_desc;



	if (dev_desc->clk_required) {

	if (dev_desc->setup)

		dev_desc->setup(pdata);



	if (dev_desc->flags & LPSS_CLK) {

		ret = register_device_clock(adev, pdata);

		if (ret) {

			/* Skip the device, but continue the namespace scan. */
@@ -413,9 +365,6 @@ static int acpi_lpss_create_device(struct acpi_device *adev, 
		goto err_out;

	}



	if (dev_desc->setup)

		dev_desc->setup(pdata);



	adev->driver_data = pdata;

	pdev = acpi_create_platform_device(adev);

	if (!IS_ERR_OR_NULL(pdev)) {
@@ -692,19 +641,19 @@ static int acpi_lpss_platform_notify(struct notifier_block *nb, 


	switch (action) {

	case BUS_NOTIFY_BOUND_DRIVER:

		if (pdata->dev_desc->save_ctx)

		if (pdata->dev_desc->flags & LPSS_SAVE_CTX)

			pdev->dev.pm_domain = &acpi_lpss_pm_domain;

		break;

	case BUS_NOTIFY_UNBOUND_DRIVER:

		if (pdata->dev_desc->save_ctx)

		if (pdata->dev_desc->flags & LPSS_SAVE_CTX)

			pdev->dev.pm_domain = NULL;

		break;

	case BUS_NOTIFY_ADD_DEVICE:

		if (pdata->dev_desc->ltr_required)

		if (pdata->dev_desc->flags & LPSS_LTR)

			return sysfs_create_group(&pdev->dev.kobj,

						  &lpss_attr_group);

	case BUS_NOTIFY_DEL_DEVICE:

		if (pdata->dev_desc->ltr_required)

		if (pdata->dev_desc->flags & LPSS_LTR)

			sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);

	default:

		break;
@@ -721,7 +670,7 @@ static void acpi_lpss_bind(struct device *dev) 
{

	struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));



	if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required)

	if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))

		return;



	if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)