[mirror_ubuntu-artful-kernel.git] / drivers / acpi / acpi_apd.c

/*
 * AMD ACPI support for ACPI2platform device.
 *
 * Copyright (c) 2014,2015 AMD Corporation.
 * Authors: Ken Xue <Ken.Xue@amd.com>
 *	Wu, Jeff <Jeff.Wu@amd.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/clk-provider.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/clkdev.h>
#include <linux/acpi.h>
#include <linux/err.h>
#include <linux/pm.h>

#include "internal.h"

ACPI_MODULE_NAME("acpi_apd");
struct apd_private_data;

/**
 * ACPI_APD_SYSFS : add device attributes in sysfs
 * ACPI_APD_PM : attach power domain to device
 */
#define ACPI_APD_SYSFS	BIT(0)
#define ACPI_APD_PM	BIT(1)

/**
 * struct apd_device_desc - a descriptor for apd device
 * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
 * @fixed_clk_rate: fixed rate input clock source for acpi device;
 *			0 means no fixed rate input clock source
 * @setup: a hook routine to set device resource during create platform device
 *
 * Device description defined as acpi_device_id.driver_data
 */
struct apd_device_desc {
	unsigned int flags;
	unsigned int fixed_clk_rate;
	int (*setup)(struct apd_private_data *pdata);
};

struct apd_private_data {
	struct clk *clk;
	struct acpi_device *adev;
	const struct apd_device_desc *dev_desc;
};

#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
#define APD_ADDR(desc)	((unsigned long)&desc)

static int acpi_apd_setup(struct apd_private_data *pdata)
{
	const struct apd_device_desc *dev_desc = pdata->dev_desc;
	struct clk *clk = ERR_PTR(-ENODEV);

	if (dev_desc->fixed_clk_rate) {
		clk = clk_register_fixed_rate(&pdata->adev->dev,
					dev_name(&pdata->adev->dev),
					NULL, 0, dev_desc->fixed_clk_rate);
		clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
		pdata->clk = clk;
	}

	return 0;
}

#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
static struct apd_device_desc cz_i2c_desc = {
	.setup = acpi_apd_setup,
	.fixed_clk_rate = 133000000,
};

static struct apd_device_desc cz_uart_desc = {
	.setup = acpi_apd_setup,
	.fixed_clk_rate = 48000000,
};
#endif

#ifdef CONFIG_ARM64
static struct apd_device_desc xgene_i2c_desc = {
	.setup = acpi_apd_setup,
	.fixed_clk_rate = 100000000,
};
#endif

#else

#define APD_ADDR(desc) (0UL)

#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */

/**
* Create platform device during acpi scan attach handle.
* Return value > 0 on success of creating device.
*/
static int acpi_apd_create_device(struct acpi_device *adev,
				   const struct acpi_device_id *id)
{
	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
	struct apd_private_data *pdata;
	struct platform_device *pdev;
	int ret;

	if (!dev_desc) {
		pdev = acpi_create_platform_device(adev);
		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
	}

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

	pdata->adev = adev;
	pdata->dev_desc = dev_desc;

	if (dev_desc->setup) {
		ret = dev_desc->setup(pdata);
		if (ret)
			goto err_out;
	}

	adev->driver_data = pdata;
	pdev = acpi_create_platform_device(adev);
	if (!IS_ERR_OR_NULL(pdev))
		return 1;

	ret = PTR_ERR(pdev);
	adev->driver_data = NULL;

 err_out:
	kfree(pdata);
	return ret;
}

static const struct acpi_device_id acpi_apd_device_ids[] = {
	/* Generic apd devices */
#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
	{ "AMDI0010", APD_ADDR(cz_i2c_desc) },
	{ "AMD0020", APD_ADDR(cz_uart_desc) },
	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
	{ "AMD0030", },
#endif
#ifdef CONFIG_ARM64
	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
#endif
	{ }
};

static struct acpi_scan_handler apd_handler = {
	.ids = acpi_apd_device_ids,
	.attach = acpi_apd_create_device,
};

void __init acpi_apd_init(void)
{
	acpi_scan_add_handler(&apd_handler);
}
Commit	Line	Data
92082a88 KX	1	/*
	2	* AMD ACPI support for ACPI2platform device.
	3	*
	4	* Copyright (c) 2014,2015 AMD Corporation.
	5	* Authors: Ken Xue <Ken.Xue@amd.com>
	6	* Wu, Jeff <Jeff.Wu@amd.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/clk-provider.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/pm_domain.h>
	16	#include <linux/clkdev.h>
	17	#include <linux/acpi.h>
	18	#include <linux/err.h>
92082a88 KX	19	#include <linux/pm.h>
	20
	21	#include "internal.h"
	22
	23	ACPI_MODULE_NAME("acpi_apd");
	24	struct apd_private_data;
	25
	26	/**
	27	* ACPI_APD_SYSFS : add device attributes in sysfs
	28	* ACPI_APD_PM : attach power domain to device
	29	*/
	30	#define ACPI_APD_SYSFS BIT(0)
	31	#define ACPI_APD_PM BIT(1)
	32
	33	/**
	34	* struct apd_device_desc - a descriptor for apd device
	35	* @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
	36	* @fixed_clk_rate: fixed rate input clock source for acpi device;
	37	* 0 means no fixed rate input clock source
	38	* @setup: a hook routine to set device resource during create platform device
	39	*
	40	* Device description defined as acpi_device_id.driver_data
	41	*/
	42	struct apd_device_desc {
	43	unsigned int flags;
	44	unsigned int fixed_clk_rate;
	45	int (setup)(struct apd_private_data pdata);
	46	};
	47
	48	struct apd_private_data {
	49	struct clk *clk;
	50	struct acpi_device *adev;
	51	const struct apd_device_desc *dev_desc;
	52	};
	53
b790eb20	54	#if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) \|\| defined(CONFIG_ARM64)
92082a88 KX	55	#define APD_ADDR(desc) ((unsigned long)&desc)
	56
	57	static int acpi_apd_setup(struct apd_private_data *pdata)
	58	{
	59	const struct apd_device_desc *dev_desc = pdata->dev_desc;
	60	struct clk *clk = ERR_PTR(-ENODEV);
	61
	62	if (dev_desc->fixed_clk_rate) {
	63	clk = clk_register_fixed_rate(&pdata->adev->dev,
	64	dev_name(&pdata->adev->dev),
cdd9a6b2	65	NULL, 0, dev_desc->fixed_clk_rate);
92082a88 KX	66	clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
	67	pdata->clk = clk;
	68	}
	69
	70	return 0;
	71	}
	72
b790eb20	73	#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
92082a88 KX	74	static struct apd_device_desc cz_i2c_desc = {
	75	.setup = acpi_apd_setup,
	76	.fixed_clk_rate = 133000000,
	77	};
	78
	79	static struct apd_device_desc cz_uart_desc = {
	80	.setup = acpi_apd_setup,
	81	.fixed_clk_rate = 48000000,
	82	};
b790eb20 LH	83	#endif
	84
	85	#ifdef CONFIG_ARM64
	86	static struct apd_device_desc xgene_i2c_desc = {
	87	.setup = acpi_apd_setup,
	88	.fixed_clk_rate = 100000000,
	89	};
	90	#endif
92082a88 KX	91
	92	#else
	93
	94	#define APD_ADDR(desc) (0UL)
	95
	96	#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
	97
	98	/**
	99	* Create platform device during acpi scan attach handle.
	100	* Return value > 0 on success of creating device.
	101	*/
	102	static int acpi_apd_create_device(struct acpi_device *adev,
	103	const struct acpi_device_id *id)
	104	{
	105	const struct apd_device_desc dev_desc = (void )id->driver_data;
	106	struct apd_private_data *pdata;
	107	struct platform_device *pdev;
	108	int ret;
	109
	110	if (!dev_desc) {
	111	pdev = acpi_create_platform_device(adev);
	112	return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
	113	}
	114
	115	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	116	if (!pdata)
	117	return -ENOMEM;
	118
	119	pdata->adev = adev;
	120	pdata->dev_desc = dev_desc;
	121
	122	if (dev_desc->setup) {
	123	ret = dev_desc->setup(pdata);
	124	if (ret)
	125	goto err_out;
	126	}
	127
	128	adev->driver_data = pdata;
	129	pdev = acpi_create_platform_device(adev);
	130	if (!IS_ERR_OR_NULL(pdev))
	131	return 1;
	132
	133	ret = PTR_ERR(pdev);
	134	adev->driver_data = NULL;
	135
	136	err_out:
	137	kfree(pdata);
	138	return ret;
	139	}
	140
	141	static const struct acpi_device_id acpi_apd_device_ids[] = {
	142	/* Generic apd devices */
b790eb20	143	#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
92082a88	144	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
e4e666ba	145	{ "AMDI0010", APD_ADDR(cz_i2c_desc) },
92082a88	146	{ "AMD0020", APD_ADDR(cz_uart_desc) },
f5eda99e	147	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
92082a88	148	{ "AMD0030", },
b790eb20 LH	149	#endif
	150	#ifdef CONFIG_ARM64
	151	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
	152	#endif
92082a88 KX	153	{ }
	154	};
	155
	156	static struct acpi_scan_handler apd_handler = {
	157	.ids = acpi_apd_device_ids,
	158	.attach = acpi_apd_create_device,
	159	};
	160
	161	void __init acpi_apd_init(void)
	162	{
	163	acpi_scan_add_handler(&apd_handler);
	164	}