[mirror_ubuntu-bionic-kernel.git] / drivers / platform / x86 / intel_pmc_ipc.c

/*
 * intel_pmc_ipc.c: Driver for the Intel PMC IPC mechanism
 *
 * (C) Copyright 2014-2015 Intel Corporation
 *
 * This driver is based on Intel SCU IPC driver(intel_scu_opc.c) by
 *     Sreedhara DS <sreedhara.ds@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 *
 * PMC running in ARC processor communicates with other entity running in IA
 * core through IPC mechanism which in turn messaging between IA core ad PMC.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/pm_qos.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/sched.h>
#include <linux/atomic.h>
#include <linux/notifier.h>
#include <linux/suspend.h>
#include <linux/acpi.h>
#include <asm/intel_pmc_ipc.h>
#include <linux/platform_data/itco_wdt.h>

/*
 * IPC registers
 * The IA write to IPC_CMD command register triggers an interrupt to the ARC,
 * The ARC handles the interrupt and services it, writing optional data to
 * the IPC1 registers, updates the IPC_STS response register with the status.
 */
#define IPC_CMD			0x0
#define		IPC_CMD_MSI		0x100
#define		IPC_CMD_SIZE		16
#define		IPC_CMD_SUBCMD		12
#define IPC_STATUS		0x04
#define		IPC_STATUS_IRQ		0x4
#define		IPC_STATUS_ERR		0x2
#define		IPC_STATUS_BUSY		0x1
#define IPC_SPTR		0x08
#define IPC_DPTR		0x0C
#define IPC_WRITE_BUFFER	0x80
#define IPC_READ_BUFFER		0x90

/*
 * 16-byte buffer for sending data associated with IPC command.
 */
#define IPC_DATA_BUFFER_SIZE	16

#define IPC_LOOP_CNT		3000000
#define IPC_MAX_SEC		3

#define IPC_TRIGGER_MODE_IRQ		true

/* exported resources from IFWI */
#define PLAT_RESOURCE_IPC_INDEX		0
#define PLAT_RESOURCE_IPC_SIZE		0x1000
#define PLAT_RESOURCE_GCR_SIZE		0x1000
#define PLAT_RESOURCE_PUNIT_DATA_INDEX	1
#define PLAT_RESOURCE_PUNIT_INTER_INDEX	2
#define PLAT_RESOURCE_ACPI_IO_INDEX	0

/*
 * BIOS does not create an ACPI device for each PMC function,
 * but exports multiple resources from one ACPI device(IPC) for
 * multiple functions. This driver is responsible to create a
 * platform device and to export resources for those functions.
 */
#define TCO_DEVICE_NAME			"iTCO_wdt"
#define SMI_EN_OFFSET			0x30
#define SMI_EN_SIZE			4
#define TCO_BASE_OFFSET			0x60
#define TCO_REGS_SIZE			16
#define PUNIT_DEVICE_NAME		"intel_punit_ipc"

static const int iTCO_version = 3;

static struct intel_pmc_ipc_dev {
	struct device *dev;
	void __iomem *ipc_base;
	bool irq_mode;
	int irq;
	int cmd;
	struct completion cmd_complete;

	/* The following PMC BARs share the same ACPI device with the IPC */
	resource_size_t acpi_io_base;
	int acpi_io_size;
	struct platform_device *tco_dev;

	/* gcr */
	resource_size_t gcr_base;
	int gcr_size;

	/* punit */
	resource_size_t punit_base;
	int punit_size;
	resource_size_t punit_base2;
	int punit_size2;
	struct platform_device *punit_dev;
} ipcdev;

static char *ipc_err_sources[] = {
	[IPC_ERR_NONE] =
		"no error",
	[IPC_ERR_CMD_NOT_SUPPORTED] =
		"command not supported",
	[IPC_ERR_CMD_NOT_SERVICED] =
		"command not serviced",
	[IPC_ERR_UNABLE_TO_SERVICE] =
		"unable to service",
	[IPC_ERR_CMD_INVALID] =
		"command invalid",
	[IPC_ERR_CMD_FAILED] =
		"command failed",
	[IPC_ERR_EMSECURITY] =
		"Invalid Battery",
	[IPC_ERR_UNSIGNEDKERNEL] =
		"Unsigned kernel",
};

/* Prevent concurrent calls to the PMC */
static DEFINE_MUTEX(ipclock);

static inline void ipc_send_command(u32 cmd)
{
	ipcdev.cmd = cmd;
	if (ipcdev.irq_mode) {
		reinit_completion(&ipcdev.cmd_complete);
		cmd |= IPC_CMD_MSI;
	}
	writel(cmd, ipcdev.ipc_base + IPC_CMD);
}

static inline u32 ipc_read_status(void)
{
	return readl(ipcdev.ipc_base + IPC_STATUS);
}

static inline void ipc_data_writel(u32 data, u32 offset)
{
	writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
}

static inline u8 ipc_data_readb(u32 offset)
{
	return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
}

static inline u32 ipc_data_readl(u32 offset)
{
	return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
}

static int intel_pmc_ipc_check_status(void)
{
	int status;
	int ret = 0;

	if (ipcdev.irq_mode) {
		if (0 == wait_for_completion_timeout(
				&ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
			ret = -ETIMEDOUT;
	} else {
		int loop_count = IPC_LOOP_CNT;

		while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
			udelay(1);
		if (loop_count == 0)
			ret = -ETIMEDOUT;
	}

	status = ipc_read_status();
	if (ret == -ETIMEDOUT) {
		dev_err(ipcdev.dev,
			"IPC timed out, TS=0x%x, CMD=0x%x\n",
			status, ipcdev.cmd);
		return ret;
	}

	if (status & IPC_STATUS_ERR) {
		int i;

		ret = -EIO;
		i = (status >> IPC_CMD_SIZE) & 0xFF;
		if (i < ARRAY_SIZE(ipc_err_sources))
			dev_err(ipcdev.dev,
				"IPC failed: %s, STS=0x%x, CMD=0x%x\n",
				ipc_err_sources[i], status, ipcdev.cmd);
		else
			dev_err(ipcdev.dev,
				"IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
				status, ipcdev.cmd);
		if ((i == IPC_ERR_UNSIGNEDKERNEL) || (i == IPC_ERR_EMSECURITY))
			ret = -EACCES;
	}

	return ret;
}

/**
 * intel_pmc_ipc_simple_command() - Simple IPC command
 * @cmd:	IPC command code.
 * @sub:	IPC command sub type.
 *
 * Send a simple IPC command to PMC when don't need to specify
 * input/output data and source/dest pointers.
 *
 * Return:	an IPC error code or 0 on success.
 */
int intel_pmc_ipc_simple_command(int cmd, int sub)
{
	int ret;

	mutex_lock(&ipclock);
	if (ipcdev.dev == NULL) {
		mutex_unlock(&ipclock);
		return -ENODEV;
	}
	ipc_send_command(sub << IPC_CMD_SUBCMD | cmd);
	ret = intel_pmc_ipc_check_status();
	mutex_unlock(&ipclock);

	return ret;
}
EXPORT_SYMBOL_GPL(intel_pmc_ipc_simple_command);

/**
 * intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
 * @cmd:	IPC command code.
 * @sub:	IPC command sub type.
 * @in:		input data of this IPC command.
 * @inlen:	input data length in bytes.
 * @out:	output data of this IPC command.
 * @outlen:	output data length in dwords.
 * @sptr:	data writing to SPTR register.
 * @dptr:	data writing to DPTR register.
 *
 * Send an IPC command to PMC with input/output data and source/dest pointers.
 *
 * Return:	an IPC error code or 0 on success.
 */
int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
			  u32 outlen, u32 dptr, u32 sptr)
{
	u32 wbuf[4] = { 0 };
	int ret;
	int i;

	if (inlen > IPC_DATA_BUFFER_SIZE || outlen > IPC_DATA_BUFFER_SIZE / 4)
		return -EINVAL;

	mutex_lock(&ipclock);
	if (ipcdev.dev == NULL) {
		mutex_unlock(&ipclock);
		return -ENODEV;
	}
	memcpy(wbuf, in, inlen);
	writel(dptr, ipcdev.ipc_base + IPC_DPTR);
	writel(sptr, ipcdev.ipc_base + IPC_SPTR);
	/* The input data register is 32bit register and inlen is in Byte */
	for (i = 0; i < ((inlen + 3) / 4); i++)
		ipc_data_writel(wbuf[i], 4 * i);
	ipc_send_command((inlen << IPC_CMD_SIZE) |
			(sub << IPC_CMD_SUBCMD) | cmd);
	ret = intel_pmc_ipc_check_status();
	if (!ret) {
		/* out is read from 32bit register and outlen is in 32bit */
		for (i = 0; i < outlen; i++)
			*out++ = ipc_data_readl(4 * i);
	}
	mutex_unlock(&ipclock);

	return ret;
}
EXPORT_SYMBOL_GPL(intel_pmc_ipc_raw_cmd);

/**
 * intel_pmc_ipc_command() -  IPC command with input/output data
 * @cmd:	IPC command code.
 * @sub:	IPC command sub type.
 * @in:		input data of this IPC command.
 * @inlen:	input data length in bytes.
 * @out:	output data of this IPC command.
 * @outlen:	output data length in dwords.
 *
 * Send an IPC command to PMC with input/output data.
 *
 * Return:	an IPC error code or 0 on success.
 */
int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
			  u32 *out, u32 outlen)
{
	return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
}
EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);

static irqreturn_t ioc(int irq, void *dev_id)
{
	int status;

	if (ipcdev.irq_mode) {
		status = ipc_read_status();
		writel(status | IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
	}
	complete(&ipcdev.cmd_complete);

	return IRQ_HANDLED;
}

static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	resource_size_t pci_resource;
	int ret;
	int len;

	ipcdev.dev = &pci_dev_get(pdev)->dev;
	ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;

	ret = pci_enable_device(pdev);
	if (ret)
		return ret;

	ret = pci_request_regions(pdev, "intel_pmc_ipc");
	if (ret)
		return ret;

	pci_resource = pci_resource_start(pdev, 0);
	len = pci_resource_len(pdev, 0);
	if (!pci_resource || !len) {
		dev_err(&pdev->dev, "Failed to get resource\n");
		return -ENOMEM;
	}

	init_completion(&ipcdev.cmd_complete);

	if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
		dev_err(&pdev->dev, "Failed to request irq\n");
		return -EBUSY;
	}

	ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
	if (!ipcdev.ipc_base) {
		dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
		free_irq(pdev->irq, &ipcdev);
		ret = -ENOMEM;
	}

	return ret;
}

static void ipc_pci_remove(struct pci_dev *pdev)
{
	free_irq(pdev->irq, &ipcdev);
	pci_release_regions(pdev);
	pci_dev_put(pdev);
	iounmap(ipcdev.ipc_base);
	ipcdev.dev = NULL;
}

static const struct pci_device_id ipc_pci_ids[] = {
	{PCI_VDEVICE(INTEL, 0x0a94), 0},
	{PCI_VDEVICE(INTEL, 0x1a94), 0},
	{ 0,}
};
MODULE_DEVICE_TABLE(pci, ipc_pci_ids);

static struct pci_driver ipc_pci_driver = {
	.name = "intel_pmc_ipc",
	.id_table = ipc_pci_ids,
	.probe = ipc_pci_probe,
	.remove = ipc_pci_remove,
};

static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
					      struct device_attribute *attr,
					      const char *buf, size_t count)
{
	int subcmd;
	int cmd;
	int ret;

	ret = sscanf(buf, "%d %d", &cmd, &subcmd);
	if (ret != 2) {
		dev_err(dev, "Error args\n");
		return -EINVAL;
	}

	ret = intel_pmc_ipc_simple_command(cmd, subcmd);
	if (ret) {
		dev_err(dev, "command %d error with %d\n", cmd, ret);
		return ret;
	}
	return (ssize_t)count;
}

static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
					     struct device_attribute *attr,
					     const char *buf, size_t count)
{
	unsigned long val;
	int subcmd;
	int ret;

	if (kstrtoul(buf, 0, &val))
		return -EINVAL;

	if (val)
		subcmd = 1;
	else
		subcmd = 0;
	ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
	if (ret) {
		dev_err(dev, "command north %d error with %d\n", subcmd, ret);
		return ret;
	}
	return (ssize_t)count;
}

static DEVICE_ATTR(simplecmd, S_IWUSR,
		   NULL, intel_pmc_ipc_simple_cmd_store);
static DEVICE_ATTR(northpeak, S_IWUSR,
		   NULL, intel_pmc_ipc_northpeak_store);

static struct attribute *intel_ipc_attrs[] = {
	&dev_attr_northpeak.attr,
	&dev_attr_simplecmd.attr,
	NULL
};

static const struct attribute_group intel_ipc_group = {
	.attrs = intel_ipc_attrs,
};

#define PUNIT_RESOURCE_INTER		1
static struct resource punit_res[] = {
	/* Punit */
	{
		.flags = IORESOURCE_MEM,
	},
	{
		.flags = IORESOURCE_MEM,
	},
};

#define TCO_RESOURCE_ACPI_IO		0
#define TCO_RESOURCE_SMI_EN_IO		1
#define TCO_RESOURCE_GCR_MEM		2
static struct resource tco_res[] = {
	/* ACPI - TCO */
	{
		.flags = IORESOURCE_IO,
	},
	/* ACPI - SMI */
	{
		.flags = IORESOURCE_IO,
	},
	/* GCS */
	{
		.flags = IORESOURCE_MEM,
	},
};

static struct itco_wdt_platform_data tco_info = {
	.name = "Apollo Lake SoC",
	.version = 3,
};

static int ipc_create_punit_device(void)
{
	struct platform_device *pdev;
	struct resource *res;
	int ret;

	pdev = platform_device_alloc(PUNIT_DEVICE_NAME, -1);
	if (!pdev) {
		dev_err(ipcdev.dev, "Failed to alloc punit platform device\n");
		return -ENOMEM;
	}

	pdev->dev.parent = ipcdev.dev;

	res = punit_res;
	res->start = ipcdev.punit_base;
	res->end = res->start + ipcdev.punit_size - 1;

	res = punit_res + PUNIT_RESOURCE_INTER;
	res->start = ipcdev.punit_base2;
	res->end = res->start + ipcdev.punit_size2 - 1;

	ret = platform_device_add_resources(pdev, punit_res,
					    ARRAY_SIZE(punit_res));
	if (ret) {
		dev_err(ipcdev.dev, "Failed to add platform punit resources\n");
		goto err;
	}

	ret = platform_device_add(pdev);
	if (ret) {
		dev_err(ipcdev.dev, "Failed to add punit platform device\n");
		goto err;
	}
	ipcdev.punit_dev = pdev;

	return 0;
err:
	platform_device_put(pdev);
	return ret;
}

static int ipc_create_tco_device(void)
{
	struct platform_device *pdev;
	struct resource *res;
	int ret;

	pdev = platform_device_alloc(TCO_DEVICE_NAME, -1);
	if (!pdev) {
		dev_err(ipcdev.dev, "Failed to alloc tco platform device\n");
		return -ENOMEM;
	}

	pdev->dev.parent = ipcdev.dev;

	res = tco_res + TCO_RESOURCE_ACPI_IO;
	res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
	res->end = res->start + TCO_REGS_SIZE - 1;

	res = tco_res + TCO_RESOURCE_SMI_EN_IO;
	res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
	res->end = res->start + SMI_EN_SIZE - 1;

	res = tco_res + TCO_RESOURCE_GCR_MEM;
	res->start = ipcdev.gcr_base;
	res->end = res->start + ipcdev.gcr_size - 1;

	ret = platform_device_add_resources(pdev, tco_res, ARRAY_SIZE(tco_res));
	if (ret) {
		dev_err(ipcdev.dev, "Failed to add tco platform resources\n");
		goto err;
	}

	ret = platform_device_add_data(pdev, &tco_info, sizeof(tco_info));
	if (ret) {
		dev_err(ipcdev.dev, "Failed to add tco platform data\n");
		goto err;
	}

	ret = platform_device_add(pdev);
	if (ret) {
		dev_err(ipcdev.dev, "Failed to add tco platform device\n");
		goto err;
	}
	ipcdev.tco_dev = pdev;

	return 0;
err:
	platform_device_put(pdev);
	return ret;
}

static int ipc_create_pmc_devices(void)
{
	int ret;

	ret = ipc_create_tco_device();
	if (ret) {
		dev_err(ipcdev.dev, "Failed to add tco platform device\n");
		return ret;
	}
	ret = ipc_create_punit_device();
	if (ret) {
		dev_err(ipcdev.dev, "Failed to add punit platform device\n");
		platform_device_unregister(ipcdev.tco_dev);
	}
	return ret;
}

static int ipc_plat_get_res(struct platform_device *pdev)
{
	struct resource *res;
	void __iomem *addr;
	int size;

	res = platform_get_resource(pdev, IORESOURCE_IO,
				    PLAT_RESOURCE_ACPI_IO_INDEX);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get io resource\n");
		return -ENXIO;
	}
	size = resource_size(res);
	ipcdev.acpi_io_base = res->start;
	ipcdev.acpi_io_size = size;
	dev_info(&pdev->dev, "io res: %llx %x\n",
		 (long long)res->start, (int)resource_size(res));

	res = platform_get_resource(pdev, IORESOURCE_MEM,
				    PLAT_RESOURCE_PUNIT_DATA_INDEX);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get punit resource\n");
		return -ENXIO;
	}
	size = resource_size(res);
	ipcdev.punit_base = res->start;
	ipcdev.punit_size = size;
	dev_info(&pdev->dev, "punit data res: %llx %x\n",
		 (long long)res->start, (int)resource_size(res));

	res = platform_get_resource(pdev, IORESOURCE_MEM,
				    PLAT_RESOURCE_PUNIT_INTER_INDEX);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get punit inter resource\n");
		return -ENXIO;
	}
	size = resource_size(res);
	ipcdev.punit_base2 = res->start;
	ipcdev.punit_size2 = size;
	dev_info(&pdev->dev, "punit interface res: %llx %x\n",
		 (long long)res->start, (int)resource_size(res));

	res = platform_get_resource(pdev, IORESOURCE_MEM,
				    PLAT_RESOURCE_IPC_INDEX);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get ipc resource\n");
		return -ENXIO;
	}
	size = PLAT_RESOURCE_IPC_SIZE;
	if (!request_mem_region(res->start, size, pdev->name)) {
		dev_err(&pdev->dev, "Failed to request ipc resource\n");
		return -EBUSY;
	}
	addr = ioremap_nocache(res->start, size);
	if (!addr) {
		dev_err(&pdev->dev, "I/O memory remapping failed\n");
		release_mem_region(res->start, size);
		return -ENOMEM;
	}
	ipcdev.ipc_base = addr;

	ipcdev.gcr_base = res->start + size;
	ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
	dev_info(&pdev->dev, "ipc res: %llx %x\n",
		 (long long)res->start, (int)resource_size(res));

	return 0;
}

#ifdef CONFIG_ACPI
static const struct acpi_device_id ipc_acpi_ids[] = {
	{ "INT34D2", 0},
	{ }
};
MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);
#endif

static int ipc_plat_probe(struct platform_device *pdev)
{
	struct resource *res;
	int ret;

	ipcdev.dev = &pdev->dev;
	ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
	init_completion(&ipcdev.cmd_complete);

	ipcdev.irq = platform_get_irq(pdev, 0);
	if (ipcdev.irq < 0) {
		dev_err(&pdev->dev, "Failed to get irq\n");
		return -EINVAL;
	}

	ret = ipc_plat_get_res(pdev);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request resource\n");
		return ret;
	}

	ret = ipc_create_pmc_devices();
	if (ret) {
		dev_err(&pdev->dev, "Failed to create pmc devices\n");
		goto err_device;
	}

	if (request_irq(ipcdev.irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
		dev_err(&pdev->dev, "Failed to request irq\n");
		ret = -EBUSY;
		goto err_irq;
	}

	ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
	if (ret) {
		dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
			ret);
		goto err_sys;
	}

	return 0;
err_sys:
	free_irq(ipcdev.irq, &ipcdev);
err_irq:
	platform_device_unregister(ipcdev.tco_dev);
	platform_device_unregister(ipcdev.punit_dev);
err_device:
	iounmap(ipcdev.ipc_base);
	res = platform_get_resource(pdev, IORESOURCE_MEM,
				    PLAT_RESOURCE_IPC_INDEX);
	if (res)
		release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
	return ret;
}

static int ipc_plat_remove(struct platform_device *pdev)
{
	struct resource *res;

	sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
	free_irq(ipcdev.irq, &ipcdev);
	platform_device_unregister(ipcdev.tco_dev);
	platform_device_unregister(ipcdev.punit_dev);
	iounmap(ipcdev.ipc_base);
	res = platform_get_resource(pdev, IORESOURCE_MEM,
				    PLAT_RESOURCE_IPC_INDEX);
	if (res)
		release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
	ipcdev.dev = NULL;
	return 0;
}

static struct platform_driver ipc_plat_driver = {
	.remove = ipc_plat_remove,
	.probe = ipc_plat_probe,
	.driver = {
		.name = "pmc-ipc-plat",
		.acpi_match_table = ACPI_PTR(ipc_acpi_ids),
	},
};

static int __init intel_pmc_ipc_init(void)
{
	int ret;

	ret = platform_driver_register(&ipc_plat_driver);
	if (ret) {
		pr_err("Failed to register PMC ipc platform driver\n");
		return ret;
	}
	ret = pci_register_driver(&ipc_pci_driver);
	if (ret) {
		pr_err("Failed to register PMC ipc pci driver\n");
		platform_driver_unregister(&ipc_plat_driver);
		return ret;
	}
	return ret;
}

static void __exit intel_pmc_ipc_exit(void)
{
	pci_unregister_driver(&ipc_pci_driver);
	platform_driver_unregister(&ipc_plat_driver);
}

MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>");
MODULE_DESCRIPTION("Intel PMC IPC driver");
MODULE_LICENSE("GPL");

/* Some modules are dependent on this, so init earlier */
fs_initcall(intel_pmc_ipc_init);
module_exit(intel_pmc_ipc_exit);
Commit	Line	Data
0a8b8353	1	/*
	2	* intel_pmc_ipc.c: Driver for the Intel PMC IPC mechanism
	3	*
	4	* (C) Copyright 2014-2015 Intel Corporation
	5	*
	6	* This driver is based on Intel SCU IPC driver(intel_scu_opc.c) by
	7	* Sreedhara DS <sreedhara.ds@intel.com>
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; version 2
	12	* of the License.
	13	*
	14	* PMC running in ARC processor communicates with other entity running in IA
	15	* core through IPC mechanism which in turn messaging between IA core ad PMC.
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/delay.h>
	20	#include <linux/errno.h>
	21	#include <linux/init.h>
	22	#include <linux/device.h>
	23	#include <linux/pm.h>
	24	#include <linux/pci.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/pm_qos.h>
	28	#include <linux/kernel.h>
	29	#include <linux/bitops.h>
	30	#include <linux/sched.h>
	31	#include <linux/atomic.h>
	32	#include <linux/notifier.h>
	33	#include <linux/suspend.h>
	34	#include <linux/acpi.h>
	35	#include <asm/intel_pmc_ipc.h>
420b54de	36	#include <linux/platform_data/itco_wdt.h>
0a8b8353	37
	38	/*
	39	* IPC registers
	40	* The IA write to IPC_CMD command register triggers an interrupt to the ARC,
	41	* The ARC handles the interrupt and services it, writing optional data to
	42	* the IPC1 registers, updates the IPC_STS response register with the status.
	43	*/
	44	#define IPC_CMD 0x0
	45	#define IPC_CMD_MSI 0x100
	46	#define IPC_CMD_SIZE 16
	47	#define IPC_CMD_SUBCMD 12
	48	#define IPC_STATUS 0x04
	49	#define IPC_STATUS_IRQ 0x4
	50	#define IPC_STATUS_ERR 0x2
	51	#define IPC_STATUS_BUSY 0x1
	52	#define IPC_SPTR 0x08
	53	#define IPC_DPTR 0x0C
	54	#define IPC_WRITE_BUFFER 0x80
	55	#define IPC_READ_BUFFER 0x90
	56
	57	/*
	58	* 16-byte buffer for sending data associated with IPC command.
	59	*/
	60	#define IPC_DATA_BUFFER_SIZE 16
	61
	62	#define IPC_LOOP_CNT 3000000
	63	#define IPC_MAX_SEC 3
	64
	65	#define IPC_TRIGGER_MODE_IRQ true
	66
	67	/* exported resources from IFWI */
	68	#define PLAT_RESOURCE_IPC_INDEX 0
	69	#define PLAT_RESOURCE_IPC_SIZE 0x1000
	70	#define PLAT_RESOURCE_GCR_SIZE 0x1000
	71	#define PLAT_RESOURCE_PUNIT_DATA_INDEX 1
	72	#define PLAT_RESOURCE_PUNIT_INTER_INDEX 2
	73	#define PLAT_RESOURCE_ACPI_IO_INDEX 0
	74
	75	/*
	76	* BIOS does not create an ACPI device for each PMC function,
	77	* but exports multiple resources from one ACPI device(IPC) for
	78	* multiple functions. This driver is responsible to create a
	79	* platform device and to export resources for those functions.
	80	*/
	81	#define TCO_DEVICE_NAME "iTCO_wdt"
	82	#define SMI_EN_OFFSET 0x30
	83	#define SMI_EN_SIZE 4
	84	#define TCO_BASE_OFFSET 0x60
	85	#define TCO_REGS_SIZE 16
	86	#define PUNIT_DEVICE_NAME "intel_punit_ipc"
	87
	88	static const int iTCO_version = 3;
	89
	90	static struct intel_pmc_ipc_dev {
	91	struct device *dev;
	92	void __iomem *ipc_base;
	93	bool irq_mode;
	94	int irq;
	95	int cmd;
	96	struct completion cmd_complete;
	97
	98	/* The following PMC BARs share the same ACPI device with the IPC */
b78fb51b	99	resource_size_t acpi_io_base;
0a8b8353	100	int acpi_io_size;
	101	struct platform_device *tco_dev;
	102
	103	/* gcr */
b78fb51b	104	resource_size_t gcr_base;
0a8b8353	105	int gcr_size;
	106
	107	/* punit */
b78fb51b	108	resource_size_t punit_base;
0a8b8353	109	int punit_size;
b78fb51b	110	resource_size_t punit_base2;
0a8b8353	111	int punit_size2;
	112	struct platform_device *punit_dev;
	113	} ipcdev;
	114
	115	static char *ipc_err_sources[] = {
	116	[IPC_ERR_NONE] =
	117	"no error",
	118	[IPC_ERR_CMD_NOT_SUPPORTED] =
	119	"command not supported",
	120	[IPC_ERR_CMD_NOT_SERVICED] =
	121	"command not serviced",
	122	[IPC_ERR_UNABLE_TO_SERVICE] =
	123	"unable to service",
	124	[IPC_ERR_CMD_INVALID] =
	125	"command invalid",
	126	[IPC_ERR_CMD_FAILED] =
	127	"command failed",
	128	[IPC_ERR_EMSECURITY] =
	129	"Invalid Battery",
	130	[IPC_ERR_UNSIGNEDKERNEL] =
	131	"Unsigned kernel",
	132	};
	133
	134	/* Prevent concurrent calls to the PMC */
	135	static DEFINE_MUTEX(ipclock);
	136
	137	static inline void ipc_send_command(u32 cmd)
	138	{
	139	ipcdev.cmd = cmd;
	140	if (ipcdev.irq_mode) {
	141	reinit_completion(&ipcdev.cmd_complete);
	142	cmd \|= IPC_CMD_MSI;
	143	}
	144	writel(cmd, ipcdev.ipc_base + IPC_CMD);
	145	}
	146
	147	static inline u32 ipc_read_status(void)
	148	{
	149	return readl(ipcdev.ipc_base + IPC_STATUS);
	150	}
	151
	152	static inline void ipc_data_writel(u32 data, u32 offset)
	153	{
	154	writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
	155	}
	156
	157	static inline u8 ipc_data_readb(u32 offset)
	158	{
	159	return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
	160	}
	161
	162	static inline u32 ipc_data_readl(u32 offset)
	163	{
	164	return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
	165	}
	166
	167	static int intel_pmc_ipc_check_status(void)
	168	{
	169	int status;
	170	int ret = 0;
	171
	172	if (ipcdev.irq_mode) {
	173	if (0 == wait_for_completion_timeout(
	174	&ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
175	ret = -ETIMEDOUT;
176	} else {
177	int loop_count = IPC_LOOP_CNT;
178
179	while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
180	udelay(1);
181	if (loop_count == 0)
182	ret = -ETIMEDOUT;
183	}
184
185	status = ipc_read_status();
186	if (ret == -ETIMEDOUT) {
187	dev_err(ipcdev.dev,
188	"IPC timed out, TS=0x%x, CMD=0x%x\n",
189	status, ipcdev.cmd);
190	return ret;
191	}
192
193	if (status & IPC_STATUS_ERR) {
194	int i;
195
196	ret = -EIO;
197	i = (status >> IPC_CMD_SIZE) & 0xFF;
198	if (i < ARRAY_SIZE(ipc_err_sources))
199	dev_err(ipcdev.dev,
200	"IPC failed: %s, STS=0x%x, CMD=0x%x\n",
201	ipc_err_sources[i], status, ipcdev.cmd);
202	else
203	dev_err(ipcdev.dev,
204	"IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
205	status, ipcdev.cmd);
206	if ((i == IPC_ERR_UNSIGNEDKERNEL) \|\| (i == IPC_ERR_EMSECURITY))
207	ret = -EACCES;
208	}
209
210	return ret;
211	}
212
02941007	213	/**
	214	* intel_pmc_ipc_simple_command() - Simple IPC command
	215	* @cmd: IPC command code.
	216	* @sub: IPC command sub type.
	217	*
	218	* Send a simple IPC command to PMC when don't need to specify
	219	* input/output data and source/dest pointers.
	220	*
	221	* Return: an IPC error code or 0 on success.
0a8b8353	222	*/
	223	int intel_pmc_ipc_simple_command(int cmd, int sub)
	224	{
	225	int ret;
	226
	227	mutex_lock(&ipclock);
	228	if (ipcdev.dev == NULL) {
	229	mutex_unlock(&ipclock);
	230	return -ENODEV;
	231	}
	232	ipc_send_command(sub << IPC_CMD_SUBCMD \| cmd);
	233	ret = intel_pmc_ipc_check_status();
	234	mutex_unlock(&ipclock);
	235
	236	return ret;
	237	}
	238	EXPORT_SYMBOL_GPL(intel_pmc_ipc_simple_command);
	239
02941007	240	/**
	241	* intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
	242	* @cmd: IPC command code.
	243	* @sub: IPC command sub type.
	244	* @in: input data of this IPC command.
	245	* @inlen: input data length in bytes.
	246	* @out: output data of this IPC command.
	247	* @outlen: output data length in dwords.
	248	* @sptr: data writing to SPTR register.
	249	* @dptr: data writing to DPTR register.
	250	*
	251	* Send an IPC command to PMC with input/output data and source/dest pointers.
	252	*
	253	* Return: an IPC error code or 0 on success.
0a8b8353	254	*/
	255	int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 in, u32 inlen, u32 out,
	256	u32 outlen, u32 dptr, u32 sptr)
	257	{
	258	u32 wbuf[4] = { 0 };
	259	int ret;
	260	int i;
	261
	262	if (inlen > IPC_DATA_BUFFER_SIZE \|\| outlen > IPC_DATA_BUFFER_SIZE / 4)
	263	return -EINVAL;
	264
	265	mutex_lock(&ipclock);
	266	if (ipcdev.dev == NULL) {
	267	mutex_unlock(&ipclock);
	268	return -ENODEV;
	269	}
	270	memcpy(wbuf, in, inlen);
	271	writel(dptr, ipcdev.ipc_base + IPC_DPTR);
	272	writel(sptr, ipcdev.ipc_base + IPC_SPTR);
	273	/* The input data register is 32bit register and inlen is in Byte */
	274	for (i = 0; i < ((inlen + 3) / 4); i++)
	275	ipc_data_writel(wbuf[i], 4 * i);
	276	ipc_send_command((inlen << IPC_CMD_SIZE) \|
	277	(sub << IPC_CMD_SUBCMD) \| cmd);
	278	ret = intel_pmc_ipc_check_status();
	279	if (!ret) {
	280	/* out is read from 32bit register and outlen is in 32bit */
	281	for (i = 0; i < outlen; i++)
	282	out++ = ipc_data_readl(4 i);
	283	}
	284	mutex_unlock(&ipclock);
	285
	286	return ret;
	287	}
	288	EXPORT_SYMBOL_GPL(intel_pmc_ipc_raw_cmd);
	289
02941007	290	/**
	291	* intel_pmc_ipc_command() - IPC command with input/output data
	292	* @cmd: IPC command code.
	293	* @sub: IPC command sub type.
	294	* @in: input data of this IPC command.
	295	* @inlen: input data length in bytes.
	296	* @out: output data of this IPC command.
	297	* @outlen: output data length in dwords.
	298	*
	299	* Send an IPC command to PMC with input/output data.
	300	*
	301	* Return: an IPC error code or 0 on success.
0a8b8353	302	*/
	303	int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
	304	u32 *out, u32 outlen)
	305	{
	306	return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
	307	}
	308	EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);
	309
	310	static irqreturn_t ioc(int irq, void *dev_id)
	311	{
	312	int status;
	313
	314	if (ipcdev.irq_mode) {
	315	status = ipc_read_status();
	316	writel(status \| IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
	317	}
	318	complete(&ipcdev.cmd_complete);
	319
	320	return IRQ_HANDLED;
	321	}
	322
	323	static int ipc_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	324	{
	325	resource_size_t pci_resource;
	326	int ret;
	327	int len;
	328
	329	ipcdev.dev = &pci_dev_get(pdev)->dev;
	330	ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
	331
	332	ret = pci_enable_device(pdev);
	333	if (ret)
	334	return ret;
	335
	336	ret = pci_request_regions(pdev, "intel_pmc_ipc");
	337	if (ret)
	338	return ret;
	339
	340	pci_resource = pci_resource_start(pdev, 0);
	341	len = pci_resource_len(pdev, 0);
	342	if (!pci_resource \|\| !len) {
	343	dev_err(&pdev->dev, "Failed to get resource\n");
	344	return -ENOMEM;
	345	}
	346
	347	init_completion(&ipcdev.cmd_complete);
	348
	349	if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
	350	dev_err(&pdev->dev, "Failed to request irq\n");
	351	return -EBUSY;
	352	}
	353
	354	ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
	355	if (!ipcdev.ipc_base) {
	356	dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
	357	free_irq(pdev->irq, &ipcdev);
	358	ret = -ENOMEM;
	359	}
	360
	361	return ret;
	362	}
	363
	364	static void ipc_pci_remove(struct pci_dev *pdev)
	365	{
366	free_irq(pdev->irq, &ipcdev);
367	pci_release_regions(pdev);
368	pci_dev_put(pdev);
369	iounmap(ipcdev.ipc_base);
370	ipcdev.dev = NULL;
371	}
372
373	static const struct pci_device_id ipc_pci_ids[] = {
374	{PCI_VDEVICE(INTEL, 0x0a94), 0},
375	{PCI_VDEVICE(INTEL, 0x1a94), 0},
376	{ 0,}
377	};
378	MODULE_DEVICE_TABLE(pci, ipc_pci_ids);
379
380	static struct pci_driver ipc_pci_driver = {
381	.name = "intel_pmc_ipc",
382	.id_table = ipc_pci_ids,
383	.probe = ipc_pci_probe,
384	.remove = ipc_pci_remove,
385	};
386
387	static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
388	struct device_attribute *attr,
389	const char *buf, size_t count)
390	{
391	int subcmd;
392	int cmd;
393	int ret;
394
395	ret = sscanf(buf, "%d %d", &cmd, &subcmd);
396	if (ret != 2) {
397	dev_err(dev, "Error args\n");
398	return -EINVAL;
399	}
400
401	ret = intel_pmc_ipc_simple_command(cmd, subcmd);
402	if (ret) {
403	dev_err(dev, "command %d error with %d\n", cmd, ret);
404	return ret;
405	}
406	return (ssize_t)count;
407	}
408
409	static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
410	struct device_attribute *attr,
411	const char *buf, size_t count)
412	{
413	unsigned long val;
414	int subcmd;
415	int ret;
416
417	if (kstrtoul(buf, 0, &val))
418	return -EINVAL;
419
420	if (val)
421	subcmd = 1;
422	else
423	subcmd = 0;
424	ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
425	if (ret) {
426	dev_err(dev, "command north %d error with %d\n", subcmd, ret);
427	return ret;
428	}
429	return (ssize_t)count;
430	}
431
432	static DEVICE_ATTR(simplecmd, S_IWUSR,
433	NULL, intel_pmc_ipc_simple_cmd_store);
434	static DEVICE_ATTR(northpeak, S_IWUSR,
435	NULL, intel_pmc_ipc_northpeak_store);
436
437	static struct attribute *intel_ipc_attrs[] = {
438	&dev_attr_northpeak.attr,
439	&dev_attr_simplecmd.attr,
440	NULL
441	};
442
443	static const struct attribute_group intel_ipc_group = {
444	.attrs = intel_ipc_attrs,
445	};
446
447	#define PUNIT_RESOURCE_INTER 1
448	static struct resource punit_res[] = {
449	/* Punit */
450	{
451	.flags = IORESOURCE_MEM,
452	},
453	{
454	.flags = IORESOURCE_MEM,
455	},
456	};
457
458	#define TCO_RESOURCE_ACPI_IO 0
459	#define TCO_RESOURCE_SMI_EN_IO 1
460	#define TCO_RESOURCE_GCR_MEM 2
461	static struct resource tco_res[] = {
462	/* ACPI - TCO */
463	{
464	.flags = IORESOURCE_IO,
465	},
466	/* ACPI - SMI */
467	{
468	.flags = IORESOURCE_IO,
469	},
470	/* GCS */
471	{
472	.flags = IORESOURCE_MEM,
473	},
474	};
475
420b54de	476	static struct itco_wdt_platform_data tco_info = {
0a8b8353	477	.name = "Apollo Lake SoC",
420b54de	478	.version = 3,
0a8b8353	479	};
	480
	481	static int ipc_create_punit_device(void)
	482	{
	483	struct platform_device *pdev;
	484	struct resource *res;
	485	int ret;
	486
	487	pdev = platform_device_alloc(PUNIT_DEVICE_NAME, -1);
	488	if (!pdev) {
	489	dev_err(ipcdev.dev, "Failed to alloc punit platform device\n");
	490	return -ENOMEM;
	491	}
	492
	493	pdev->dev.parent = ipcdev.dev;
	494
	495	res = punit_res;
b78fb51b	496	res->start = ipcdev.punit_base;
0a8b8353	497	res->end = res->start + ipcdev.punit_size - 1;
	498
	499	res = punit_res + PUNIT_RESOURCE_INTER;
b78fb51b	500	res->start = ipcdev.punit_base2;
0a8b8353	501	res->end = res->start + ipcdev.punit_size2 - 1;
	502
	503	ret = platform_device_add_resources(pdev, punit_res,
	504	ARRAY_SIZE(punit_res));
	505	if (ret) {
	506	dev_err(ipcdev.dev, "Failed to add platform punit resources\n");
	507	goto err;
	508	}
	509
	510	ret = platform_device_add(pdev);
	511	if (ret) {
	512	dev_err(ipcdev.dev, "Failed to add punit platform device\n");
	513	goto err;
	514	}
	515	ipcdev.punit_dev = pdev;
	516
	517	return 0;
	518	err:
	519	platform_device_put(pdev);
	520	return ret;
	521	}
	522
	523	static int ipc_create_tco_device(void)
	524	{
	525	struct platform_device *pdev;
	526	struct resource *res;
	527	int ret;
	528
	529	pdev = platform_device_alloc(TCO_DEVICE_NAME, -1);
	530	if (!pdev) {
	531	dev_err(ipcdev.dev, "Failed to alloc tco platform device\n");
	532	return -ENOMEM;
	533	}
	534
	535	pdev->dev.parent = ipcdev.dev;
	536
	537	res = tco_res + TCO_RESOURCE_ACPI_IO;
b78fb51b	538	res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
0a8b8353	539	res->end = res->start + TCO_REGS_SIZE - 1;
	540
	541	res = tco_res + TCO_RESOURCE_SMI_EN_IO;
b78fb51b	542	res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
0a8b8353	543	res->end = res->start + SMI_EN_SIZE - 1;
	544
	545	res = tco_res + TCO_RESOURCE_GCR_MEM;
b78fb51b	546	res->start = ipcdev.gcr_base;
0a8b8353	547	res->end = res->start + ipcdev.gcr_size - 1;
	548
	549	ret = platform_device_add_resources(pdev, tco_res, ARRAY_SIZE(tco_res));
	550	if (ret) {
	551	dev_err(ipcdev.dev, "Failed to add tco platform resources\n");
	552	goto err;
	553	}
	554
420b54de	555	ret = platform_device_add_data(pdev, &tco_info, sizeof(tco_info));
0a8b8353	556	if (ret) {
	557	dev_err(ipcdev.dev, "Failed to add tco platform data\n");
	558	goto err;
	559	}
	560
	561	ret = platform_device_add(pdev);
	562	if (ret) {
	563	dev_err(ipcdev.dev, "Failed to add tco platform device\n");
	564	goto err;
	565	}
	566	ipcdev.tco_dev = pdev;
	567
	568	return 0;
	569	err:
	570	platform_device_put(pdev);
	571	return ret;
	572	}
	573
	574	static int ipc_create_pmc_devices(void)
	575	{
	576	int ret;
	577
	578	ret = ipc_create_tco_device();
	579	if (ret) {
	580	dev_err(ipcdev.dev, "Failed to add tco platform device\n");
	581	return ret;
	582	}
	583	ret = ipc_create_punit_device();
	584	if (ret) {
	585	dev_err(ipcdev.dev, "Failed to add punit platform device\n");
	586	platform_device_unregister(ipcdev.tco_dev);
	587	}
	588	return ret;
	589	}
	590
	591	static int ipc_plat_get_res(struct platform_device *pdev)
	592	{
	593	struct resource *res;
	594	void __iomem *addr;
	595	int size;
	596
	597	res = platform_get_resource(pdev, IORESOURCE_IO,
	598	PLAT_RESOURCE_ACPI_IO_INDEX);
	599	if (!res) {
	600	dev_err(&pdev->dev, "Failed to get io resource\n");
	601	return -ENXIO;
	602	}
	603	size = resource_size(res);
b78fb51b	604	ipcdev.acpi_io_base = res->start;
0a8b8353	605	ipcdev.acpi_io_size = size;
	606	dev_info(&pdev->dev, "io res: %llx %x\n",
	607	(long long)res->start, (int)resource_size(res));
	608
	609	res = platform_get_resource(pdev, IORESOURCE_MEM,
	610	PLAT_RESOURCE_PUNIT_DATA_INDEX);
	611	if (!res) {
	612	dev_err(&pdev->dev, "Failed to get punit resource\n");
	613	return -ENXIO;
	614	}
	615	size = resource_size(res);
b78fb51b	616	ipcdev.punit_base = res->start;
0a8b8353	617	ipcdev.punit_size = size;
	618	dev_info(&pdev->dev, "punit data res: %llx %x\n",
	619	(long long)res->start, (int)resource_size(res));
	620
	621	res = platform_get_resource(pdev, IORESOURCE_MEM,
	622	PLAT_RESOURCE_PUNIT_INTER_INDEX);
	623	if (!res) {
	624	dev_err(&pdev->dev, "Failed to get punit inter resource\n");
	625	return -ENXIO;
	626	}
	627	size = resource_size(res);
b78fb51b	628	ipcdev.punit_base2 = res->start;
0a8b8353	629	ipcdev.punit_size2 = size;
	630	dev_info(&pdev->dev, "punit interface res: %llx %x\n",
	631	(long long)res->start, (int)resource_size(res));
	632
	633	res = platform_get_resource(pdev, IORESOURCE_MEM,
	634	PLAT_RESOURCE_IPC_INDEX);
	635	if (!res) {
	636	dev_err(&pdev->dev, "Failed to get ipc resource\n");
	637	return -ENXIO;
	638	}
	639	size = PLAT_RESOURCE_IPC_SIZE;
	640	if (!request_mem_region(res->start, size, pdev->name)) {
	641	dev_err(&pdev->dev, "Failed to request ipc resource\n");
	642	return -EBUSY;
	643	}
	644	addr = ioremap_nocache(res->start, size);
	645	if (!addr) {
	646	dev_err(&pdev->dev, "I/O memory remapping failed\n");
	647	release_mem_region(res->start, size);
	648	return -ENOMEM;
	649	}
	650	ipcdev.ipc_base = addr;
	651
b78fb51b	652	ipcdev.gcr_base = res->start + size;
0a8b8353	653	ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
	654	dev_info(&pdev->dev, "ipc res: %llx %x\n",
	655	(long long)res->start, (int)resource_size(res));
	656
	657	return 0;
	658	}
	659
	660	#ifdef CONFIG_ACPI
	661	static const struct acpi_device_id ipc_acpi_ids[] = {
	662	{ "INT34D2", 0},
	663	{ }
	664	};
	665	MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);
	666	#endif
	667
	668	static int ipc_plat_probe(struct platform_device *pdev)
	669	{
	670	struct resource *res;
	671	int ret;
	672
	673	ipcdev.dev = &pdev->dev;
	674	ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
	675	init_completion(&ipcdev.cmd_complete);
	676
	677	ipcdev.irq = platform_get_irq(pdev, 0);
	678	if (ipcdev.irq < 0) {
	679	dev_err(&pdev->dev, "Failed to get irq\n");
	680	return -EINVAL;
	681	}
	682
	683	ret = ipc_plat_get_res(pdev);
	684	if (ret) {
	685	dev_err(&pdev->dev, "Failed to request resource\n");
	686	return ret;
	687	}
	688
	689	ret = ipc_create_pmc_devices();
	690	if (ret) {
	691	dev_err(&pdev->dev, "Failed to create pmc devices\n");
	692	goto err_device;
	693	}
	694
	695	if (request_irq(ipcdev.irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
	696	dev_err(&pdev->dev, "Failed to request irq\n");
	697	ret = -EBUSY;
	698	goto err_irq;
	699	}
	700
	701	ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
	702	if (ret) {
	703	dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
	704	ret);
	705	goto err_sys;
	706	}
	707
	708	return 0;
	709	err_sys:
	710	free_irq(ipcdev.irq, &ipcdev);
	711	err_irq:
	712	platform_device_unregister(ipcdev.tco_dev);
	713	platform_device_unregister(ipcdev.punit_dev);
	714	err_device:
	715	iounmap(ipcdev.ipc_base);
	716	res = platform_get_resource(pdev, IORESOURCE_MEM,
717	PLAT_RESOURCE_IPC_INDEX);
718	if (res)
719	release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
720	return ret;
721	}
722
723	static int ipc_plat_remove(struct platform_device *pdev)
724	{
725	struct resource *res;
726
727	sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
728	free_irq(ipcdev.irq, &ipcdev);
729	platform_device_unregister(ipcdev.tco_dev);
730	platform_device_unregister(ipcdev.punit_dev);
731	iounmap(ipcdev.ipc_base);
732	res = platform_get_resource(pdev, IORESOURCE_MEM,
733	PLAT_RESOURCE_IPC_INDEX);
734	if (res)
735	release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
736	ipcdev.dev = NULL;
737	return 0;
738	}
739
740	static struct platform_driver ipc_plat_driver = {
741	.remove = ipc_plat_remove,
742	.probe = ipc_plat_probe,
743	.driver = {
744	.name = "pmc-ipc-plat",
745	.acpi_match_table = ACPI_PTR(ipc_acpi_ids),
746	},
747	};
748
749	static int __init intel_pmc_ipc_init(void)
750	{
751	int ret;
752
753	ret = platform_driver_register(&ipc_plat_driver);
754	if (ret) {
755	pr_err("Failed to register PMC ipc platform driver\n");
756	return ret;
757	}
758	ret = pci_register_driver(&ipc_pci_driver);
759	if (ret) {
760	pr_err("Failed to register PMC ipc pci driver\n");
761	platform_driver_unregister(&ipc_plat_driver);
762	return ret;
763	}
764	return ret;
765	}
766
767	static void __exit intel_pmc_ipc_exit(void)
768	{
769	pci_unregister_driver(&ipc_pci_driver);
770	platform_driver_unregister(&ipc_plat_driver);
771	}
772
773	MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>");
774	MODULE_DESCRIPTION("Intel PMC IPC driver");
775	MODULE_LICENSE("GPL");
776
777	/* Some modules are dependent on this, so init earlier */
778	fs_initcall(intel_pmc_ipc_init);
779	module_exit(intel_pmc_ipc_exit);