[RFC v6 6/9] platform: x86: Add generic Intel IPC driver
From: sathyanarayanan . kuppuswamy
Date: Wed Oct 18 2017 - 20:25:28 EST
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Currently intel_scu_ipc.c, intel_pmc_ipc.c and intel_punit_ipc.c
redundantly implements the same IPC features and has lot of code
duplication between them. This driver addresses this issue by grouping
the common IPC functionalities under the same driver.
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
drivers/platform/x86/Kconfig | 8 +
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/intel_ipc_dev.c | 565 ++++++++++++++++++++++++
include/linux/platform_data/x86/intel_ipc_dev.h | 246 +++++++++++
4 files changed, 820 insertions(+)
create mode 100644 drivers/platform/x86/intel_ipc_dev.c
create mode 100644 include/linux/platform_data/x86/intel_ipc_dev.h
Changes since v5:
* Added structures to group intel_ipc_cmd() intel_ipc_raw_cmd()
arguments.
Changes since v4:
* None
Changes since v3:
* Fixed NULL pointer exception in intel_ipc_dev_get().
* Fixed error in check for duplicate intel_ipc_dev.
* Added custom interrupt handler support.
* Used char array for error string conversion.
* Added put dev support.
* Added devm_* variant of intel_ipc_dev_get().
Changes since v2:
* Added ipc_dev_cmd API support.
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 45f4e79..9df7cda 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1140,6 +1140,14 @@ config SILEAD_DMI
with the OS-image for the device. This option supplies the missing
information. Enable this for x86 tablets with Silead touchscreens.
+config INTEL_IPC_DEV
+ bool "Intel IPC Device Driver"
+ depends on X86_64
+ ---help---
+ This driver implements core features of Intel IPC device. Devices
+ like PMC, SCU, PUNIT, etc can use interfaces provided by this
+ driver to implement IPC protocol of their respective device.
+
endif # X86_PLATFORM_DEVICES
config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 91cec17..04e11ce 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -83,3 +83,4 @@ obj-$(CONFIG_PMC_ATOM) += pmc_atom.o
obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
obj-$(CONFIG_MLX_CPLD_PLATFORM) += mlxcpld-hotplug.o
obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
+obj-$(CONFIG_INTEL_IPC_DEV) += intel_ipc_dev.o
diff --git a/drivers/platform/x86/intel_ipc_dev.c b/drivers/platform/x86/intel_ipc_dev.c
new file mode 100644
index 0000000..078c9c5
--- /dev/null
+++ b/drivers/platform/x86/intel_ipc_dev.c
@@ -0,0 +1,565 @@
+/*
+ * intel_ipc_dev.c: Intel IPC device class driver
+ *
+ * (C) Copyright 2017 Intel Corporation
+ *
+ * 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.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/idr.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_data/x86/intel_ipc_dev.h>
+#include <linux/regmap.h>
+
+/* mutex to sync different ipc devices in same channel */
+static struct mutex channel_lock[IPC_CHANNEL_MAX];
+
+static char *ipc_err_sources[] = {
+ [IPC_DEV_ERR_NONE] =
+ "No error",
+ [IPC_DEV_ERR_CMD_NOT_SUPPORTED] =
+ "Command not-supported/Invalid",
+ [IPC_DEV_ERR_CMD_NOT_SERVICED] =
+ "Command not-serviced/Invalid param",
+ [IPC_DEV_ERR_UNABLE_TO_SERVICE] =
+ "Unable-to-service/Cmd-timeout",
+ [IPC_DEV_ERR_CMD_INVALID] =
+ "Command-invalid/Cmd-locked",
+ [IPC_DEV_ERR_CMD_FAILED] =
+ "Command-failed/Invalid-VR-id",
+ [IPC_DEV_ERR_EMSECURITY] =
+ "Invalid Battery/VR-Error",
+ [IPC_DEV_ERR_UNSIGNEDKERNEL] =
+ "Unsigned kernel",
+};
+
+static void ipc_channel_lock_init(void)
+{
+ int i;
+
+ for (i = 0; i < IPC_CHANNEL_MAX; i++)
+ mutex_init(&channel_lock[i]);
+}
+
+static struct class intel_ipc_class = {
+ .name = "intel_ipc",
+ .owner = THIS_MODULE,
+};
+
+static int ipc_dev_lock(struct intel_ipc_dev *ipc_dev)
+{
+ int chan_type;
+
+ if (!ipc_dev || !ipc_dev->cfg)
+ return -ENODEV;
+
+ chan_type = ipc_dev->cfg->chan_type;
+ if (chan_type > IPC_CHANNEL_MAX)
+ return -EINVAL;
+
+ /* acquire channel lock */
+ mutex_lock(&channel_lock[chan_type]);
+
+ /* acquire IPC device lock */
+ mutex_lock(&ipc_dev->lock);
+
+ return 0;
+}
+
+static int ipc_dev_unlock(struct intel_ipc_dev *ipc_dev)
+{
+ int chan_type;
+
+ if (!ipc_dev || !ipc_dev->cfg)
+ return -ENODEV;
+
+ chan_type = ipc_dev->cfg->chan_type;
+ if (chan_type > IPC_CHANNEL_MAX)
+ return -EINVAL;
+
+ /* release IPC device lock */
+ mutex_unlock(&ipc_dev->lock);
+
+ /* release channel lock */
+ mutex_unlock(&channel_lock[chan_type]);
+
+ return 0;
+}
+
+static const char *ipc_dev_err_string(struct intel_ipc_dev *ipc_dev,
+ int error)
+{
+ if (error < IPC_DEV_ERR_MAX)
+ return ipc_err_sources[error];
+
+ return "Unknown Command";
+}
+
+/* Helper function to send given command to IPC device */
+static inline void ipc_dev_send_cmd(struct intel_ipc_dev *ipc_dev, u32 cmd)
+{
+ ipc_dev->cmd = cmd;
+
+ if (ipc_dev->cfg->mode == IPC_DEV_MODE_IRQ)
+ reinit_completion(&ipc_dev->cmd_complete);
+
+ if (ipc_dev->ops->enable_msi)
+ cmd = ipc_dev->ops->enable_msi(cmd);
+
+ regmap_write(ipc_dev->cfg->cmd_regs, ipc_dev->cfg->cmd_reg, cmd);
+}
+
+static inline int ipc_dev_status_busy(struct intel_ipc_dev *ipc_dev)
+{
+ int status;
+
+ regmap_read(ipc_dev->cfg->cmd_regs, ipc_dev->cfg->status_reg, &status);
+
+ if (ipc_dev->ops->busy_check)
+ return ipc_dev->ops->busy_check(status);
+
+ return 0;
+}
+
+/* Check the status of IPC command and return err code if failed */
+static int ipc_dev_check_status(struct intel_ipc_dev *ipc_dev)
+{
+ int loop_count = IPC_DEV_CMD_LOOP_CNT;
+ int status;
+ int ret = 0;
+
+ if (ipc_dev->cfg->mode == IPC_DEV_MODE_IRQ) {
+ if (!wait_for_completion_timeout(&ipc_dev->cmd_complete,
+ IPC_DEV_CMD_TIMEOUT))
+ ret = -ETIMEDOUT;
+ } else {
+ while (ipc_dev_status_busy(ipc_dev) && --loop_count)
+ udelay(1);
+ if (!loop_count)
+ ret = -ETIMEDOUT;
+ }
+
+ if (ret < 0) {
+ dev_err(&ipc_dev->dev,
+ "IPC timed out, CMD=0x%x\n", ipc_dev->cmd);
+ return ret;
+ }
+
+ regmap_read(ipc_dev->cfg->cmd_regs, ipc_dev->cfg->status_reg, &status);
+
+ if (ipc_dev->ops->to_err_code)
+ ret = ipc_dev->ops->to_err_code(status);
+
+ if (ret) {
+ dev_err(&ipc_dev->dev,
+ "IPC failed: %s, STS=0x%x, CMD=0x%x\n",
+ ipc_dev_err_string(ipc_dev, ret),
+ status, ipc_dev->cmd);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/**
+ * ipc_dev_simple_cmd() - Send simple IPC command
+ * @ipc_dev : Reference to ipc device.
+ * @cmd_list : IPC command list.
+ * @cmdlen : Number of cmd/sub-cmds.
+ *
+ * Send a simple IPC command to ipc device.
+ * Use this when don't need to specify input/output data
+ * and source/dest pointers.
+ *
+ * Return: an IPC error code or 0 on success.
+ */
+
+int ipc_dev_simple_cmd(struct intel_ipc_dev *ipc_dev, u32 *cmd_list,
+ u32 cmdlen)
+{
+ int ret;
+
+ if (!cmd_list)
+ return -EINVAL;
+
+ ret = ipc_dev_lock(ipc_dev);
+ if (ret)
+ return ret;
+
+ /* Call custom pre-processing handler */
+ if (ipc_dev->ops->pre_simple_cmd_fn) {
+ ret = ipc_dev->ops->pre_simple_cmd_fn(cmd_list, cmdlen);
+ if (ret)
+ goto unlock_device;
+ }
+
+ ipc_dev_send_cmd(ipc_dev, cmd_list[0]);
+
+ ret = ipc_dev_check_status(ipc_dev);
+
+unlock_device:
+ ipc_dev_unlock(ipc_dev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ipc_dev_simple_cmd);
+
+/**
+ * ipc_dev_cmd() - Send IPC command with data.
+ * @ipc_dev : Reference to ipc_dev.
+ * @ipc_cmd : Intel IPC command argument structure.
+ *
+ * Send an IPC command to device with input/output data.
+ *
+ * Return: an IPC error code or 0 on success.
+ */
+int ipc_dev_cmd(struct intel_ipc_dev *ipc_dev, struct intel_ipc_cmd *ipc_cmd)
+{
+ int ret;
+
+ if (!ipc_cmd || !ipc_cmd->cmd_list || !ipc_cmd->in)
+ return -EINVAL;
+
+ ret = ipc_dev_lock(ipc_dev);
+ if (ret)
+ return ret;
+
+ /* Call custom pre-processing handler. */
+ if (ipc_dev->ops->pre_cmd_fn) {
+ ret = ipc_dev->ops->pre_cmd_fn(ipc_cmd);
+ if (ret)
+ goto unlock_device;
+ }
+
+ /* Write inlen dwords of data to wrbuf_reg. */
+ if (ipc_cmd->inlen > 0)
+ regmap_bulk_write(ipc_dev->cfg->data_regs,
+ ipc_dev->cfg->wrbuf_reg, ipc_cmd->in,
+ ipc_cmd->inlen);
+
+ ipc_dev_send_cmd(ipc_dev, ipc_cmd->cmd_list[0]);
+
+ ret = ipc_dev_check_status(ipc_dev);
+
+ /* Read outlen dwords of data from rbug_reg. */
+ if (!ret && ipc_cmd->outlen > 0)
+ regmap_bulk_read(ipc_dev->cfg->data_regs,
+ ipc_dev->cfg->rbuf_reg, ipc_cmd->out,
+ ipc_cmd->outlen);
+unlock_device:
+ ipc_dev_unlock(ipc_dev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ipc_dev_cmd);
+
+/**
+ * ipc_dev_raw_cmd() - Send IPC command with data and pointers.
+ * @ipc_dev : Reference to ipc_dev.
+ * @ipc_raw_cmd : Intel IPC raw command argument structure.
+ *
+ * Send an IPC command to device with input/output data and
+ * source/dest pointers.
+ *
+ * Return: an IPC error code or 0 on success.
+ */
+
+int ipc_dev_raw_cmd(struct intel_ipc_dev *ipc_dev,
+ struct intel_ipc_raw_cmd *ipc_raw_cmd)
+{
+ int ret, inbuflen;
+ u32 *inbuf;
+
+ if (!ipc_raw_cmd || !ipc_raw_cmd->cmd_list || !ipc_raw_cmd->in)
+ return -EINVAL;
+
+ inbuflen = DIV_ROUND_UP(ipc_raw_cmd->inlen, 4);
+
+ inbuf = kzalloc(inbuflen, GFP_KERNEL);
+ if (!inbuf)
+ return -ENOMEM;
+
+ ret = ipc_dev_lock(ipc_dev);
+ if (ret)
+ return ret;
+
+ /* Call custom pre-processing handler. */
+ if (ipc_dev->ops->pre_raw_cmd_fn) {
+ ret = ipc_dev->ops->pre_raw_cmd_fn(ipc_raw_cmd);
+ if (ret)
+ goto unlock_device;
+ }
+
+ /* If supported, write DPTR register.*/
+ if (ipc_dev->cfg->support_dptr)
+ regmap_write(ipc_dev->cfg->cmd_regs, ipc_dev->cfg->dptr_reg,
+ ipc_raw_cmd->dptr);
+
+ /* If supported, write SPTR register. */
+ if (ipc_dev->cfg->support_sptr)
+ regmap_write(ipc_dev->cfg->cmd_regs, ipc_dev->cfg->sptr_reg,
+ ipc_raw_cmd->sptr);
+
+ memcpy(inbuf, ipc_raw_cmd->in, ipc_raw_cmd->inlen);
+
+ /* Write inlen dwords of data to wrbuf_reg. */
+ if (ipc_raw_cmd->inlen > 0)
+ regmap_bulk_write(ipc_dev->cfg->data_regs,
+ ipc_dev->cfg->wrbuf_reg, inbuf, inbuflen);
+
+ ipc_dev_send_cmd(ipc_dev, ipc_raw_cmd->cmd_list[0]);
+
+ ret = ipc_dev_check_status(ipc_dev);
+
+ /* Read outlen dwords of data from rbug_reg. */
+ if (!ret && ipc_raw_cmd->outlen > 0)
+ regmap_bulk_read(ipc_dev->cfg->data_regs,
+ ipc_dev->cfg->rbuf_reg, ipc_raw_cmd->out,
+ ipc_raw_cmd->outlen);
+unlock_device:
+ ipc_dev_unlock(ipc_dev);
+ kfree(inbuf);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ipc_dev_raw_cmd);
+
+/* sysfs option to send simple IPC commands from userspace */
+static ssize_t ipc_dev_cmd_reg_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct intel_ipc_dev *ipc_dev = dev_get_drvdata(dev);
+ u32 cmd;
+ int ret;
+
+ ret = sscanf(buf, "%d", &cmd);
+ if (ret != 1) {
+ dev_err(dev, "Error args\n");
+ return -EINVAL;
+ }
+
+ ret = ipc_dev_simple_cmd(ipc_dev, &cmd, 1);
+ if (ret) {
+ dev_err(dev, "command 0x%x error with %d\n", cmd, ret);
+ return ret;
+ }
+ return (ssize_t)count;
+}
+
+static DEVICE_ATTR(send_cmd, S_IWUSR, NULL, ipc_dev_cmd_reg_store);
+
+static struct attribute *ipc_dev_attrs[] = {
+ &dev_attr_send_cmd.attr,
+ NULL
+};
+
+static const struct attribute_group ipc_dev_group = {
+ .attrs = ipc_dev_attrs,
+};
+
+static const struct attribute_group *ipc_dev_groups[] = {
+ &ipc_dev_group,
+ NULL,
+};
+
+/* IPC device IRQ handler */
+static irqreturn_t ipc_dev_irq_handler(int irq, void *dev_id)
+{
+ struct intel_ipc_dev *ipc_dev = (struct intel_ipc_dev *)dev_id;
+
+ if (ipc_dev->ops->pre_irq_handler_fn)
+ ipc_dev->ops->pre_irq_handler_fn(ipc_dev, irq);
+
+ complete(&ipc_dev->cmd_complete);
+
+ return IRQ_HANDLED;
+}
+
+static void devm_intel_ipc_dev_release(struct device *dev, void *res)
+{
+ struct intel_ipc_dev *ipc_dev = *(struct intel_ipc_dev **)res;
+
+ if (!ipc_dev)
+ return;
+
+ device_del(&ipc_dev->dev);
+
+ kfree(ipc_dev);
+}
+
+static int match_name(struct device *dev, const void *data)
+{
+ if (!dev_name(dev))
+ return 0;
+
+ return !strcmp(dev_name(dev), (char *)data);
+}
+
+/**
+ * intel_ipc_dev_get() - Get Intel IPC device from name.
+ * @dev_name : Name of the IPC device.
+ *
+ * Return : ERR_PTR/NULL or intel_ipc_dev pointer on success.
+ */
+struct intel_ipc_dev *intel_ipc_dev_get(const char *dev_name)
+{
+ struct device *dev;
+
+ if (!dev_name)
+ return ERR_PTR(-EINVAL);
+
+ dev = class_find_device(&intel_ipc_class, NULL, dev_name, match_name);
+
+ return dev ? dev_get_drvdata(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(intel_ipc_dev_get);
+
+static void devm_intel_ipc_dev_put(struct device *dev, void *res)
+{
+ intel_ipc_dev_put(*(struct intel_ipc_dev **)res);
+}
+
+/**
+ * devm_intel_ipc_dev_get() - Resource managed version of intel_ipc_dev_get().
+ * @dev : Device pointer.
+ * @dev_name : Name of the IPC device.
+ *
+ * Return : ERR_PTR/NULL or intel_ipc_dev pointer on success.
+ */
+struct intel_ipc_dev *devm_intel_ipc_dev_get(struct device *dev,
+ const char *dev_name)
+{
+ struct intel_ipc_dev **ptr, *ipc_dev;
+
+ ptr = devres_alloc(devm_intel_ipc_dev_put, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ ipc_dev = intel_ipc_dev_get(dev_name);
+ if (!IS_ERR_OR_NULL(ipc_dev)) {
+ *ptr = ipc_dev;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return ipc_dev;
+}
+EXPORT_SYMBOL_GPL(devm_intel_ipc_dev_get);
+
+/**
+ * devm_intel_ipc_dev_create() - Create IPC device
+ * @dev : IPC parent device.
+ * @devname : Name of the IPC device.
+ * @cfg : IPC device configuration.
+ * @ops : IPC device ops.
+ *
+ * Resource managed API to create IPC device with
+ * given configuration.
+ *
+ * Return : IPC device pointer or ERR_PTR(error code).
+ */
+struct intel_ipc_dev *devm_intel_ipc_dev_create(struct device *dev,
+ const char *devname,
+ struct intel_ipc_dev_cfg *cfg,
+ struct intel_ipc_dev_ops *ops)
+{
+ struct intel_ipc_dev **ptr, *ipc_dev;
+ int ret;
+
+ if (!dev && !devname && !cfg)
+ return ERR_PTR(-EINVAL);
+
+ if (intel_ipc_dev_get(devname)) {
+ dev_err(dev, "IPC device %s already exist\n", devname);
+ return ERR_PTR(-EINVAL);
+ }
+
+ ptr = devres_alloc(devm_intel_ipc_dev_release, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ ipc_dev = kzalloc(sizeof(*ipc_dev), GFP_KERNEL);
+ if (!ipc_dev) {
+ ret = -ENOMEM;
+ goto err_dev_create;
+ }
+
+ ipc_dev->dev.class = &intel_ipc_class;
+ ipc_dev->dev.parent = dev;
+ ipc_dev->dev.groups = ipc_dev_groups;
+ ipc_dev->cfg = cfg;
+ ipc_dev->ops = ops;
+
+ mutex_init(&ipc_dev->lock);
+ init_completion(&ipc_dev->cmd_complete);
+ dev_set_drvdata(&ipc_dev->dev, ipc_dev);
+ dev_set_name(&ipc_dev->dev, devname);
+ device_initialize(&ipc_dev->dev);
+
+ ret = device_add(&ipc_dev->dev);
+ if (ret < 0) {
+ dev_err(&ipc_dev->dev, "%s device create failed\n",
+ __func__);
+ ret = -ENODEV;
+ goto err_dev_add;
+ }
+
+ if (ipc_dev->cfg->mode == IPC_DEV_MODE_IRQ) {
+ if (devm_request_irq(&ipc_dev->dev,
+ ipc_dev->cfg->irq,
+ ipc_dev_irq_handler,
+ ipc_dev->cfg->irqflags,
+ dev_name(&ipc_dev->dev),
+ ipc_dev)) {
+ dev_err(&ipc_dev->dev,
+ "Failed to request irq\n");
+ goto err_irq_request;
+ }
+ }
+
+ *ptr = ipc_dev;
+
+ devres_add(dev, ptr);
+
+ return ipc_dev;
+
+err_irq_request:
+ device_del(&ipc_dev->dev);
+err_dev_add:
+ kfree(ipc_dev);
+err_dev_create:
+ devres_free(ptr);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(devm_intel_ipc_dev_create);
+
+static int __init intel_ipc_init(void)
+{
+ ipc_channel_lock_init();
+ return class_register(&intel_ipc_class);
+}
+
+static void __exit intel_ipc_exit(void)
+{
+ class_unregister(&intel_ipc_class);
+}
+subsys_initcall(intel_ipc_init);
+module_exit(intel_ipc_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Intel IPC device class driver");
diff --git a/include/linux/platform_data/x86/intel_ipc_dev.h b/include/linux/platform_data/x86/intel_ipc_dev.h
new file mode 100644
index 0000000..cdf4f57
--- /dev/null
+++ b/include/linux/platform_data/x86/intel_ipc_dev.h
@@ -0,0 +1,246 @@
+/*
+ * Intel IPC class device header file.
+ *
+ * (C) Copyright 2017 Intel Corporation
+ *
+ * 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.
+ *
+ */
+
+#ifndef INTEL_IPC_DEV_H
+#define INTEL_IPC_DEV_H
+
+#include <linux/module.h>
+#include <linux/device.h>
+
+/* IPC channel type */
+#define IPC_CHANNEL_IA_PMC 0
+#define IPC_CHANNEL_IA_PUNIT 1
+#define IPC_CHANNEL_PMC_PUNIT 2
+#define IPC_CHANNEL_IA_SCU 3
+#define IPC_CHANNEL_MAX 4
+
+/* IPC return code */
+#define IPC_DEV_ERR_NONE 0
+#define IPC_DEV_ERR_CMD_NOT_SUPPORTED 1
+#define IPC_DEV_ERR_CMD_NOT_SERVICED 2
+#define IPC_DEV_ERR_UNABLE_TO_SERVICE 3
+#define IPC_DEV_ERR_CMD_INVALID 4
+#define IPC_DEV_ERR_CMD_FAILED 5
+#define IPC_DEV_ERR_EMSECURITY 6
+#define IPC_DEV_ERR_UNSIGNEDKERNEL 7
+#define IPC_DEV_ERR_MAX 8
+
+/* IPC mode */
+#define IPC_DEV_MODE_IRQ 0
+#define IPC_DEV_MODE_POLLING 1
+
+/* IPC dev constants */
+#define IPC_DEV_CMD_LOOP_CNT 3000000
+#define IPC_DEV_CMD_TIMEOUT 3 * HZ
+#define IPC_DEV_DATA_BUFFER_SIZE 16
+
+struct intel_ipc_dev;
+struct intel_ipc_raw_cmd;
+
+/**
+ * struct intel_ipc_dev_cfg - IPC device config structure.
+ *
+ * IPC device drivers uses the following config options to
+ * register new IPC device.
+ *
+ * @cmd_regs : IPC device command base regmap.
+ * @data_regs : IPC device data base regmap.
+ * @wrbuf_reg : IPC device data write register address.
+ * @rbuf_reg : IPC device data read register address.
+ * @sptr_reg : IPC device source data pointer register address.
+ * @dptr_reg : IPC device destination data pointer register
+ * address.
+ * @status_reg : IPC command status register address.
+ * @cmd_reg : IPC command register address.
+ * @mode : IRQ/POLLING mode.
+ * @irq : IPC device IRQ number.
+ * @irqflags : IPC device IRQ flags.
+ * @chan_type : IPC device channel type(PMC/PUNIT).
+ * @msi : Enable/Disable MSI for IPC commands.
+ * @support_dptr : Support DPTR update.
+ * @support_sptr : Support SPTR update.
+ *
+ */
+struct intel_ipc_dev_cfg {
+ struct regmap *cmd_regs;
+ struct regmap *data_regs;
+ unsigned int wrbuf_reg;
+ unsigned int rbuf_reg;
+ unsigned int sptr_reg;
+ unsigned int dptr_reg;
+ unsigned int status_reg;
+ unsigned int cmd_reg;
+ int mode;
+ int irq;
+ int irqflags;
+ int chan_type;
+ bool use_msi;
+ bool support_dptr;
+ bool support_sptr;
+};
+
+/**
+ * struct intel_ipc_raw_cmd - Intel IPC raw command args.
+ *
+ * @cmd_list : Array of commands/sub-commands.
+ * @cmdlen : Number of commands.
+ * @in : Input data of this IPC command.
+ * @inlen : Input data length in bytes.
+ * @out : Output data of this IPC command.
+ * @outlen : Length of output data in dwords.
+ * @dptr : IPC destination data address.
+ * @sptr : IPC source data address.
+ *
+ */
+struct intel_ipc_raw_cmd {
+ u32 *cmd_list;
+ u32 cmdlen;
+ u8 *in;
+ u32 inlen;
+ u32 *out;
+ u32 outlen;
+ u32 dptr;
+ u32 sptr;
+};
+
+/**
+ * struct intel_ipc_raw_cmd - Intel IPC command args.
+ *
+ * @cmd_list : Array of commands/sub-commands.
+ * @cmdlen : Number of commands.
+ * @in : Input data of this IPC command.
+ * @inlen : Input data length in bytes.
+ * @out : Output data of this IPC command.
+ * @outlen : Length of output data in dwords.
+ *
+ */
+struct intel_ipc_cmd {
+ u32 *cmd_list;
+ u32 cmdlen;
+ u32 *in;
+ u32 inlen;
+ u32 *out;
+ u32 outlen;
+};
+
+/**
+ * struct intel_ipc_dev_ops - IPC device ops structure.
+ *
+ * Call backs for IPC device specific operations.
+ *
+ * @to_err_code : Status to error code conversion function.
+ * @busy_check : Check for IPC busy status.
+ * @enable_msi : Enable MSI for IPC commands.
+ * @pre_simple_cmd_fn : Custom pre-processing function for
+ * ipc_dev_simple_cmd()
+ * @pre_cmd_fn : Custom pre-processing function for
+ * ipc_dev_cmd()
+ * @pre_raw_cmd_fn : Custom pre-processing function for
+ * ipc_dev_raw_cmd()
+ *
+ */
+struct intel_ipc_dev_ops {
+ int (*to_err_code)(int status);
+ int (*busy_check)(int status);
+ u32 (*enable_msi)(u32 cmd);
+ int (*pre_simple_cmd_fn)(u32 *cmd_list, u32 cmdlen);
+ int (*pre_cmd_fn)(struct intel_ipc_cmd *ipc_cmd);
+ int (*pre_raw_cmd_fn)(struct intel_ipc_raw_cmd *ipc_raw_cmd);
+ int (*pre_irq_handler_fn)(struct intel_ipc_dev *ipc_dev, int irq);
+};
+
+/**
+ * struct intel_ipc_dev - Intel IPC device structure.
+ *
+ * Used with devm_intel_ipc_dev_create() to create new IPC device.
+ *
+ * @dev : IPC device object.
+ * @cmd : Current IPC device command.
+ * @cmd_complete : Command completion object.
+ * @lock : Lock to protect IPC device structure.
+ * @ops : IPC device ops pointer.
+ * @cfg : IPC device cfg pointer.
+ *
+ */
+struct intel_ipc_dev {
+ struct device dev;
+ int cmd;
+ struct completion cmd_complete;
+ struct mutex lock;
+ struct intel_ipc_dev_ops *ops;
+ struct intel_ipc_dev_cfg *cfg;
+};
+
+#if IS_ENABLED(CONFIG_INTEL_IPC_DEV)
+
+/* API to create new IPC device */
+struct intel_ipc_dev *devm_intel_ipc_dev_create(struct device *dev,
+ const char *devname, struct intel_ipc_dev_cfg *cfg,
+ struct intel_ipc_dev_ops *ops);
+
+int ipc_dev_simple_cmd(struct intel_ipc_dev *ipc_dev, u32 *cmd_list,
+ u32 cmdlen);
+int ipc_dev_cmd(struct intel_ipc_dev *ipc_dev, struct intel_ipc_cmd *ipc_cmd);
+int ipc_dev_raw_cmd(struct intel_ipc_dev *ipc_dev,
+ struct intel_ipc_raw_cmd *ipc_raw_cmd);
+struct intel_ipc_dev *intel_ipc_dev_get(const char *dev_name);
+struct intel_ipc_dev *devm_intel_ipc_dev_get(struct device *dev,
+ const char *dev_name);
+static inline void intel_ipc_dev_put(struct intel_ipc_dev *ipc_dev)
+{
+ put_device(&ipc_dev->dev);
+}
+#else
+
+static inline struct intel_ipc_dev *devm_intel_ipc_dev_create(
+ struct device *dev,
+ const char *devname, struct intel_ipc_dev_cfg *cfg,
+ struct intel_ipc_dev_ops *ops)
+{
+ return -EINVAL;
+}
+
+static inline int ipc_dev_simple_cmd(struct intel_ipc_dev *ipc_dev,
+ u32 *cmd_list, u32 cmdlen)
+{
+ return -EINVAL;
+}
+
+static int ipc_dev_cmd(struct intel_ipc_dev *ipc_dev,
+ struct intel_ipc_cmd *ipc_cmd)
+{
+ return -EINVAL;
+}
+
+static inline int ipc_dev_raw_cmd(struct intel_ipc_dev *ipc_dev,
+ struct intel_ipc_raw_cmd *ipc_raw_cmd);
+{
+ return -EINVAL;
+}
+
+static inline struct intel_ipc_dev *intel_ipc_dev_get(const char *dev_name)
+{
+ return NULL;
+}
+
+static inline struct intel_ipc_dev *devm_intel_ipc_dev_get(struct device *dev,
+ const char *dev_name);
+{
+ return NULL;
+}
+
+static inline void intel_ipc_dev_put(struct intel_ipc_dev *ipc_dev)
+{
+ return NULL;
+}
+#endif /* CONFIG_INTEL_IPC_DEV */
+#endif /* INTEL_IPC_DEV_H */
--
2.7.4