Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...

[linux/fpc-iii.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_OFFSET        0x1008
#define PLAT_RESOURCE_GCR_SIZE          0x4
#define PLAT_RESOURCE_BIOS_DATA_INDEX   1
#define PLAT_RESOURCE_BIOS_IFACE_INDEX  2
#define PLAT_RESOURCE_TELEM_SSRAM_INDEX 3
#define PLAT_RESOURCE_ISP_DATA_INDEX    4
#define PLAT_RESOURCE_ISP_IFACE_INDEX   5
#define PLAT_RESOURCE_GTD_DATA_INDEX    6
#define PLAT_RESOURCE_GTD_IFACE_INDEX   7
#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"
#define TELEMETRY_DEVICE_NAME           "intel_telemetry"
#define TELEM_SSRAM_SIZE                240
#define TELEM_PMC_SSRAM_OFFSET          0x1B00
#define TELEM_PUNIT_SSRAM_OFFSET        0x1A00

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 */
        struct platform_device *punit_dev;

        /* Telemetry */
        resource_size_t telem_pmc_ssram_base;
        resource_size_t telem_punit_ssram_base;
        int telem_pmc_ssram_size;
        int telem_punit_ssram_size;
        u8 telem_res_inval;
        struct platform_device *telemetry_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,
};

static struct resource punit_res_array[] = {
        /* Punit BIOS */
        {
                .flags = IORESOURCE_MEM,
        },
        {
                .flags = IORESOURCE_MEM,
        },
        /* Punit ISP */
        {
                .flags = IORESOURCE_MEM,
        },
        {
                .flags = IORESOURCE_MEM,
        },
        /* Punit GTD */
        {
                .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,
};

#define TELEMETRY_RESOURCE_PUNIT_SSRAM  0
#define TELEMETRY_RESOURCE_PMC_SSRAM    1
static struct resource telemetry_res[] = {
        /*Telemetry*/
        {
                .flags = IORESOURCE_MEM,
        },
        {
                .flags = IORESOURCE_MEM,
        },
};

static int ipc_create_punit_device(void)
{
        struct platform_device *pdev;
        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;
        ret = platform_device_add_resources(pdev, punit_res_array,
                                            ARRAY_SIZE(punit_res_array));
        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_telemetry_device(void)
{
        struct platform_device *pdev;
        struct resource *res;
        int ret;

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

        pdev->dev.parent = ipcdev.dev;

        res = telemetry_res + TELEMETRY_RESOURCE_PUNIT_SSRAM;
        res->start = ipcdev.telem_punit_ssram_base;
        res->end = res->start + ipcdev.telem_punit_ssram_size - 1;

        res = telemetry_res + TELEMETRY_RESOURCE_PMC_SSRAM;
        res->start = ipcdev.telem_pmc_ssram_base;
        res->end = res->start + ipcdev.telem_pmc_ssram_size - 1;

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

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

        if (!ipcdev.telem_res_inval) {
                ret = ipc_create_telemetry_device();
                if (ret)
                        dev_warn(ipcdev.dev,
                                "Failed to add telemetry platform device\n");
        }

        return ret;
}

static int ipc_plat_get_res(struct platform_device *pdev)
{
        struct resource *res, *punit_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: %pR\n", res);

        punit_res = punit_res_array;
        /* This is index 0 to cover BIOS data register */
        res = platform_get_resource(pdev, IORESOURCE_MEM,
                                    PLAT_RESOURCE_BIOS_DATA_INDEX);
        if (!res) {
                dev_err(&pdev->dev, "Failed to get res of punit BIOS data\n");
                return -ENXIO;
        }
        *punit_res = *res;
        dev_info(&pdev->dev, "punit BIOS data res: %pR\n", res);

        /* This is index 1 to cover BIOS interface register */
        res = platform_get_resource(pdev, IORESOURCE_MEM,
                                    PLAT_RESOURCE_BIOS_IFACE_INDEX);
        if (!res) {
                dev_err(&pdev->dev, "Failed to get res of punit BIOS iface\n");
                return -ENXIO;
        }
        *++punit_res = *res;
        dev_info(&pdev->dev, "punit BIOS interface res: %pR\n", res);

        /* This is index 2 to cover ISP data register, optional */
        res = platform_get_resource(pdev, IORESOURCE_MEM,
                                    PLAT_RESOURCE_ISP_DATA_INDEX);
        ++punit_res;
        if (res) {
                *punit_res = *res;
                dev_info(&pdev->dev, "punit ISP data res: %pR\n", res);
        }

        /* This is index 3 to cover ISP interface register, optional */
        res = platform_get_resource(pdev, IORESOURCE_MEM,
                                    PLAT_RESOURCE_ISP_IFACE_INDEX);
        ++punit_res;
        if (res) {
                *punit_res = *res;
                dev_info(&pdev->dev, "punit ISP interface res: %pR\n", res);
        }

        /* This is index 4 to cover GTD data register, optional */
        res = platform_get_resource(pdev, IORESOURCE_MEM,
                                    PLAT_RESOURCE_GTD_DATA_INDEX);
        ++punit_res;
        if (res) {
                *punit_res = *res;
                dev_info(&pdev->dev, "punit GTD data res: %pR\n", res);
        }

        /* This is index 5 to cover GTD interface register, optional */
        res = platform_get_resource(pdev, IORESOURCE_MEM,
                                    PLAT_RESOURCE_GTD_IFACE_INDEX);
        ++punit_res;
        if (res) {
                *punit_res = *res;
                dev_info(&pdev->dev, "punit GTD interface res: %pR\n", 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 + PLAT_RESOURCE_GCR_OFFSET;
        ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
        dev_info(&pdev->dev, "ipc res: %pR\n", res);

        ipcdev.telem_res_inval = 0;
        res = platform_get_resource(pdev, IORESOURCE_MEM,
                                    PLAT_RESOURCE_TELEM_SSRAM_INDEX);
        if (!res) {
                dev_err(&pdev->dev, "Failed to get telemetry ssram resource\n");
                ipcdev.telem_res_inval = 1;
        } else {
                ipcdev.telem_punit_ssram_base = res->start +
                                                TELEM_PUNIT_SSRAM_OFFSET;
                ipcdev.telem_punit_ssram_size = TELEM_SSRAM_SIZE;
                ipcdev.telem_pmc_ssram_base = res->start +
                                                TELEM_PMC_SSRAM_OFFSET;
                ipcdev.telem_pmc_ssram_size = TELEM_SSRAM_SIZE;
                dev_info(&pdev->dev, "telemetry ssram res: %pR\n", 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, IRQF_NO_SUSPEND,
                        "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);
        platform_device_unregister(ipcdev.telemetry_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);
        platform_device_unregister(ipcdev.telemetry_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);