From patchwork Sun Oct 29 09:49:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 10031311 X-Patchwork-Delegate: andy.shevchenko@gmail.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0947B602B5 for ; Sun, 29 Oct 2017 09:52:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E6C1D28712 for ; Sun, 29 Oct 2017 09:52:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DB5F02871A; Sun, 29 Oct 2017 09:52:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2796F28712 for ; Sun, 29 Oct 2017 09:52:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751282AbdJ2JwK (ORCPT ); Sun, 29 Oct 2017 05:52:10 -0400 Received: from mga02.intel.com ([134.134.136.20]:19362 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750999AbdJ2Juo (ORCPT ); Sun, 29 Oct 2017 05:50:44 -0400 Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Oct 2017 02:50:42 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,314,1505804400"; d="scan'208";a="1030812076" Received: from skuppusw-desk.jf.intel.com ([10.7.198.92]) by orsmga003.jf.intel.com with ESMTP; 29 Oct 2017 02:50:41 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: a.zummo@towertech.it, x86@kernel.org, wim@iguana.be, mingo@redhat.com, alexandre.belloni@free-electrons.com, qipeng.zha@intel.com, hpa@zytor.com, dvhart@infradead.org, tglx@linutronix.de, lee.jones@linaro.org, andy@infradead.org, souvik.k.chakravarty@intel.com Cc: linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, sathyaosid@gmail.com, Kuppuswamy Sathyanarayanan Subject: [RFC v8 4/7] platform: x86: Add generic Intel IPC driver Date: Sun, 29 Oct 2017 02:49:57 -0700 Message-Id: <5c66498c110e52343d810db9c281fe72d0d299cc.1509268570.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan 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 --- MAINTAINERS | 7 + drivers/platform/x86/Kconfig | 8 + drivers/platform/x86/Makefile | 1 + drivers/platform/x86/intel_ipc_dev.c | 563 ++++++++++++++++++++++++ include/linux/platform_data/x86/intel_ipc_dev.h | 246 +++++++++++ 5 files changed, 825 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 v7: * Fixed style issues. * Added MAINTAINER info. Changes since v6: * None 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/MAINTAINERS b/MAINTAINERS index d85c089..a2a9a9f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6970,6 +6970,13 @@ R: Dan Williams S: Odd fixes F: drivers/dma/iop-adma.c +INTEL IPC CORE DRIVER +M: Kuppuswamy Sathyanarayanan +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: drivers/platform/x86/intel_ipc_dev.c +F: include/linux/platform_data/x86/intel_ipc_dev.h + INTEL IXP4XX QMGR, NPE, ETHERNET and HSS SUPPORT M: Krzysztof Halasa S: Maintained 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..0edcf23 --- /dev/null +++ b/drivers/platform/x86/intel_ipc_dev.c @@ -0,0 +1,563 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 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 = kstrtou32(buf, 0, &cmd); + if (ret < 0) + 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, 00200, 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"); +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..9e6ce6d --- /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 +#include + +/* 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 */