[linux-2.6-block.git] / drivers / acpi / acpi_lpss.c

/*
 * ACPI support for Intel Lynxpoint LPSS.
 *
 * Copyright (C) 2013, Intel Corporation
 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
 *          Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/platform_data/clk-lpss.h>
#include <linux/pm_runtime.h>

#include "internal.h"

ACPI_MODULE_NAME("acpi_lpss");

#define LPSS_CLK_SIZE	0x04
#define LPSS_LTR_SIZE	0x18

/* Offsets relative to LPSS_PRIVATE_OFFSET */
#define LPSS_GENERAL			0x08
#define LPSS_GENERAL_LTR_MODE_SW	BIT(2)
#define LPSS_SW_LTR			0x10
#define LPSS_AUTO_LTR			0x14

struct lpss_device_desc {
	bool clk_required;
	const char *clk_parent;
	bool ltr_required;
	unsigned int prv_offset;
};

struct lpss_private_data {
	void __iomem *mmio_base;
	resource_size_t mmio_size;
	struct clk *clk;
	const struct lpss_device_desc *dev_desc;
};

static struct lpss_device_desc lpt_dev_desc = {
	.clk_required = true,
	.clk_parent = "lpss_clk",
	.prv_offset = 0x800,
	.ltr_required = true,
};

static struct lpss_device_desc lpt_sdio_dev_desc = {
	.prv_offset = 0x1000,
	.ltr_required = true,
};

static const struct acpi_device_id acpi_lpss_device_ids[] = {
	/* Lynxpoint LPSS devices */
	{ "INT33C0", (unsigned long)&lpt_dev_desc },
	{ "INT33C1", (unsigned long)&lpt_dev_desc },
	{ "INT33C2", (unsigned long)&lpt_dev_desc },
	{ "INT33C3", (unsigned long)&lpt_dev_desc },
	{ "INT33C4", (unsigned long)&lpt_dev_desc },
	{ "INT33C5", (unsigned long)&lpt_dev_desc },
	{ "INT33C6", (unsigned long)&lpt_sdio_dev_desc },
	{ "INT33C7", },

	{ }
};

static int is_memory(struct acpi_resource *res, void *not_used)
{
	struct resource r;
	return !acpi_dev_resource_memory(res, &r);
}

/* LPSS main clock device. */
static struct platform_device *lpss_clk_dev;

static inline void lpt_register_clock_device(void)
{
	lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
}

static int register_device_clock(struct acpi_device *adev,
				 struct lpss_private_data *pdata)
{
	const struct lpss_device_desc *dev_desc = pdata->dev_desc;

	if (!lpss_clk_dev)
		lpt_register_clock_device();

	if (!dev_desc->clk_parent || !pdata->mmio_base
	    || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
		return -ENODATA;

	pdata->clk = clk_register_gate(NULL, dev_name(&adev->dev),
				       dev_desc->clk_parent, 0,
				       pdata->mmio_base + dev_desc->prv_offset,
				       0, 0, NULL);
	if (IS_ERR(pdata->clk))
		return PTR_ERR(pdata->clk);

	clk_register_clkdev(pdata->clk, NULL, dev_name(&adev->dev));
	return 0;
}

static int acpi_lpss_create_device(struct acpi_device *adev,
				   const struct acpi_device_id *id)
{
	struct lpss_device_desc *dev_desc;
	struct lpss_private_data *pdata;
	struct resource_list_entry *rentry;
	struct list_head resource_list;
	int ret;

	dev_desc = (struct lpss_device_desc *)id->driver_data;
	if (!dev_desc)
		return acpi_create_platform_device(adev, id);

	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	INIT_LIST_HEAD(&resource_list);
	ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
	if (ret < 0)
		goto err_out;

	list_for_each_entry(rentry, &resource_list, node)
		if (resource_type(&rentry->res) == IORESOURCE_MEM) {
			pdata->mmio_size = resource_size(&rentry->res);
			pdata->mmio_base = ioremap(rentry->res.start,
						   pdata->mmio_size);
			pdata->dev_desc = dev_desc;
			break;
		}

	acpi_dev_free_resource_list(&resource_list);

	if (dev_desc->clk_required) {
		ret = register_device_clock(adev, pdata);
		if (ret) {
			/*
			 * Skip the device, but don't terminate the namespace
			 * scan.
			 */
			kfree(pdata);
			return 0;
		}
	}

	adev->driver_data = pdata;
	ret = acpi_create_platform_device(adev, id);
	if (ret > 0)
		return ret;

	adev->driver_data = NULL;

 err_out:
	kfree(pdata);
	return ret;
}

static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
{
	struct acpi_device *adev;
	struct lpss_private_data *pdata;
	unsigned long flags;
	int ret;

	ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
	if (WARN_ON(ret))
		return ret;

	spin_lock_irqsave(&dev->power.lock, flags);
	if (pm_runtime_suspended(dev)) {
		ret = -EAGAIN;
		goto out;
	}
	pdata = acpi_driver_data(adev);
	if (WARN_ON(!pdata || !pdata->mmio_base)) {
		ret = -ENODEV;
		goto out;
	}
	*val = readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);

 out:
	spin_unlock_irqrestore(&dev->power.lock, flags);
	return ret;
}

static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	u32 ltr_value = 0;
	unsigned int reg;
	int ret;

	reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
	ret = lpss_reg_read(dev, reg, &ltr_value);
	if (ret)
		return ret;

	return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
}

static ssize_t lpss_ltr_mode_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	u32 ltr_mode = 0;
	char *outstr;
	int ret;

	ret = lpss_reg_read(dev, LPSS_GENERAL, &ltr_mode);
	if (ret)
		return ret;

	outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
	return sprintf(buf, "%s\n", outstr);
}

static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);

static struct attribute *lpss_attrs[] = {
	&dev_attr_auto_ltr.attr,
	&dev_attr_sw_ltr.attr,
	&dev_attr_ltr_mode.attr,
	NULL,
};

static struct attribute_group lpss_attr_group = {
	.attrs = lpss_attrs,
	.name = "lpss_ltr",
};

static int acpi_lpss_platform_notify(struct notifier_block *nb,
				     unsigned long action, void *data)
{
	struct platform_device *pdev = to_platform_device(data);
	struct lpss_private_data *pdata;
	struct acpi_device *adev;
	const struct acpi_device_id *id;
	int ret = 0;

	id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
	if (!id || !id->driver_data)
		return 0;

	if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
		return 0;

	pdata = acpi_driver_data(adev);
	if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required)
		return 0;

	if (pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
		dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
		return 0;
	}

	if (action == BUS_NOTIFY_ADD_DEVICE)
		ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group);
	else if (action == BUS_NOTIFY_DEL_DEVICE)
		sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);

	return ret;
}

static struct notifier_block acpi_lpss_nb = {
	.notifier_call = acpi_lpss_platform_notify,
};

static struct acpi_scan_handler lpss_handler = {
	.ids = acpi_lpss_device_ids,
	.attach = acpi_lpss_create_device,
};

void __init acpi_lpss_init(void)
{
	if (!lpt_clk_init()) {
		bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
		acpi_scan_add_handler(&lpss_handler);
	}
}
Commit	Line	Data
f58b082a RW	1	/*
	2	* ACPI support for Intel Lynxpoint LPSS.
	3	*
	4	* Copyright (C) 2013, Intel Corporation
	5	* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
	6	* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/acpi.h>
	14	#include <linux/clk.h>
	15	#include <linux/clkdev.h>
	16	#include <linux/clk-provider.h>
	17	#include <linux/err.h>
	18	#include <linux/io.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/platform_data/clk-lpss.h>
2e0f8822	21	#include <linux/pm_runtime.h>
f58b082a RW	22
	23	#include "internal.h"
	24
	25	ACPI_MODULE_NAME("acpi_lpss");
	26
f58b082a	27	#define LPSS_CLK_SIZE 0x04
2e0f8822 RW	28	#define LPSS_LTR_SIZE 0x18
	29
	30	/* Offsets relative to LPSS_PRIVATE_OFFSET */
	31	#define LPSS_GENERAL 0x08
	32	#define LPSS_GENERAL_LTR_MODE_SW BIT(2)
	33	#define LPSS_SW_LTR 0x10
	34	#define LPSS_AUTO_LTR 0x14
f58b082a RW	35
	36	struct lpss_device_desc {
	37	bool clk_required;
	38	const char *clk_parent;
2e0f8822 RW	39	bool ltr_required;
2e0f8822 RW	40	unsigned int prv_offset;
f58b082a RW	41	};
	42
	43	struct lpss_private_data {
	44	void __iomem *mmio_base;
	45	resource_size_t mmio_size;
	46	struct clk *clk;
	47	const struct lpss_device_desc *dev_desc;
	48	};
	49
	50	static struct lpss_device_desc lpt_dev_desc = {
	51	.clk_required = true,
	52	.clk_parent = "lpss_clk",
2e0f8822 RW	53	.prv_offset = 0x800,
	54	.ltr_required = true,
	55	};
	56
	57	static struct lpss_device_desc lpt_sdio_dev_desc = {
	58	.prv_offset = 0x1000,
	59	.ltr_required = true,
f58b082a RW	60	};
	61
	62	static const struct acpi_device_id acpi_lpss_device_ids[] = {
	63	/* Lynxpoint LPSS devices */
	64	{ "INT33C0", (unsigned long)&lpt_dev_desc },
	65	{ "INT33C1", (unsigned long)&lpt_dev_desc },
	66	{ "INT33C2", (unsigned long)&lpt_dev_desc },
	67	{ "INT33C3", (unsigned long)&lpt_dev_desc },
	68	{ "INT33C4", (unsigned long)&lpt_dev_desc },
	69	{ "INT33C5", (unsigned long)&lpt_dev_desc },
2e0f8822	70	{ "INT33C6", (unsigned long)&lpt_sdio_dev_desc },
f58b082a RW	71	{ "INT33C7", },
	72
	73	{ }
	74	};
	75
	76	static int is_memory(struct acpi_resource res, void not_used)
	77	{
	78	struct resource r;
	79	return !acpi_dev_resource_memory(res, &r);
	80	}
	81
	82	/* LPSS main clock device. */
	83	static struct platform_device *lpss_clk_dev;
	84
	85	static inline void lpt_register_clock_device(void)
	86	{
	87	lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
	88	}
	89
	90	static int register_device_clock(struct acpi_device *adev,
	91	struct lpss_private_data *pdata)
	92	{
	93	const struct lpss_device_desc *dev_desc = pdata->dev_desc;
	94
	95	if (!lpss_clk_dev)
	96	lpt_register_clock_device();
	97
	98	if (!dev_desc->clk_parent \|\| !pdata->mmio_base
2e0f8822	99	\|\| pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
f58b082a RW	100	return -ENODATA;
	101
	102	pdata->clk = clk_register_gate(NULL, dev_name(&adev->dev),
	103	dev_desc->clk_parent, 0,
2e0f8822	104	pdata->mmio_base + dev_desc->prv_offset,
f58b082a RW	105	0, 0, NULL);
	106	if (IS_ERR(pdata->clk))
	107	return PTR_ERR(pdata->clk);
	108
	109	clk_register_clkdev(pdata->clk, NULL, dev_name(&adev->dev));
	110	return 0;
	111	}
	112
	113	static int acpi_lpss_create_device(struct acpi_device *adev,
	114	const struct acpi_device_id *id)
	115	{
	116	struct lpss_device_desc *dev_desc;
	117	struct lpss_private_data *pdata;
	118	struct resource_list_entry *rentry;
	119	struct list_head resource_list;
	120	int ret;
	121
	122	dev_desc = (struct lpss_device_desc *)id->driver_data;
	123	if (!dev_desc)
	124	return acpi_create_platform_device(adev, id);
	125
	126	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	127	if (!pdata)
	128	return -ENOMEM;
	129
	130	INIT_LIST_HEAD(&resource_list);
	131	ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
	132	if (ret < 0)
	133	goto err_out;
	134
	135	list_for_each_entry(rentry, &resource_list, node)
	136	if (resource_type(&rentry->res) == IORESOURCE_MEM) {
	137	pdata->mmio_size = resource_size(&rentry->res);
	138	pdata->mmio_base = ioremap(rentry->res.start,
	139	pdata->mmio_size);
	140	pdata->dev_desc = dev_desc;
	141	break;
	142	}
	143
	144	acpi_dev_free_resource_list(&resource_list);
	145
	146	if (dev_desc->clk_required) {
	147	ret = register_device_clock(adev, pdata);
	148	if (ret) {
	149	/*
	150	* Skip the device, but don't terminate the namespace
	151	* scan.
	152	*/
cf8df962 AS	153	kfree(pdata);
cf8df962 AS	154	return 0;
f58b082a RW	155	}
	156	}
	157
	158	adev->driver_data = pdata;
	159	ret = acpi_create_platform_device(adev, id);
	160	if (ret > 0)
	161	return ret;
	162
	163	adev->driver_data = NULL;
	164
	165	err_out:
	166	kfree(pdata);
	167	return ret;
	168	}
	169
2e0f8822 RW	170	static int lpss_reg_read(struct device dev, unsigned int reg, u32 val)
	171	{
	172	struct acpi_device *adev;
	173	struct lpss_private_data *pdata;
	174	unsigned long flags;
	175	int ret;
	176
	177	ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
	178	if (WARN_ON(ret))
	179	return ret;
	180
	181	spin_lock_irqsave(&dev->power.lock, flags);
	182	if (pm_runtime_suspended(dev)) {
	183	ret = -EAGAIN;
	184	goto out;
	185	}
	186	pdata = acpi_driver_data(adev);
	187	if (WARN_ON(!pdata \|\| !pdata->mmio_base)) {
	188	ret = -ENODEV;
	189	goto out;
	190	}
	191	*val = readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
	192
	193	out:
	194	spin_unlock_irqrestore(&dev->power.lock, flags);
	195	return ret;
	196	}
	197
	198	static ssize_t lpss_ltr_show(struct device dev, struct device_attribute attr,
	199	char *buf)
	200	{
	201	u32 ltr_value = 0;
	202	unsigned int reg;
	203	int ret;
	204
	205	reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
	206	ret = lpss_reg_read(dev, reg, &ltr_value);
	207	if (ret)
	208	return ret;
	209
	210	return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
	211	}
	212
	213	static ssize_t lpss_ltr_mode_show(struct device *dev,
	214	struct device_attribute attr, char buf)
	215	{
	216	u32 ltr_mode = 0;
	217	char *outstr;
	218	int ret;
	219
	220	ret = lpss_reg_read(dev, LPSS_GENERAL, &ltr_mode);
	221	if (ret)
	222	return ret;
	223
	224	outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
	225	return sprintf(buf, "%s\n", outstr);
	226	}
	227
	228	static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
	229	static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
	230	static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
	231
	232	static struct attribute *lpss_attrs[] = {
	233	&dev_attr_auto_ltr.attr,
234	&dev_attr_sw_ltr.attr,
235	&dev_attr_ltr_mode.attr,
236	NULL,
237	};
238
239	static struct attribute_group lpss_attr_group = {
240	.attrs = lpss_attrs,
241	.name = "lpss_ltr",
242	};
243
244	static int acpi_lpss_platform_notify(struct notifier_block *nb,
245	unsigned long action, void *data)
246	{
247	struct platform_device *pdev = to_platform_device(data);
248	struct lpss_private_data *pdata;
249	struct acpi_device *adev;
250	const struct acpi_device_id *id;
251	int ret = 0;
252
253	id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
254	if (!id \|\| !id->driver_data)
255	return 0;
256
257	if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
258	return 0;
259
260	pdata = acpi_driver_data(adev);
261	if (!pdata \|\| !pdata->mmio_base \|\| !pdata->dev_desc->ltr_required)
262	return 0;
263
264	if (pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
265	dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
266	return 0;
267	}
268
269	if (action == BUS_NOTIFY_ADD_DEVICE)
270	ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group);
271	else if (action == BUS_NOTIFY_DEL_DEVICE)
272	sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
273
274	return ret;
275	}
276
277	static struct notifier_block acpi_lpss_nb = {
278	.notifier_call = acpi_lpss_platform_notify,
279	};
280
f58b082a RW	281	static struct acpi_scan_handler lpss_handler = {
	282	.ids = acpi_lpss_device_ids,
	283	.attach = acpi_lpss_create_device,
	284	};
	285
	286	void __init acpi_lpss_init(void)
	287	{
2e0f8822 RW	288	if (!lpt_clk_init()) {
2e0f8822 RW	289	bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
f58b082a	290	acpi_scan_add_handler(&lpss_handler);
2e0f8822	291	}
f58b082a	292	}