343 lines
8.5 KiB
C
343 lines
8.5 KiB
C
/*
|
|
* PCI glue for ISHTP provider device (ISH) driver
|
|
*
|
|
* Copyright (c) 2014-2016, Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/device.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/workqueue.h>
|
|
#define CREATE_TRACE_POINTS
|
|
#include <trace/events/intel_ish.h>
|
|
#include "ishtp-dev.h"
|
|
#include "hw-ish.h"
|
|
|
|
static const struct pci_device_id ish_pci_tbl[] = {
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_Ax_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, GLK_Ax_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_H_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ICL_MOBILE_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_H_DEVICE_ID)},
|
|
{0, }
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
|
|
|
|
/**
|
|
* ish_event_tracer() - Callback function to dump trace messages
|
|
* @dev: ishtp device
|
|
* @format: printf style format
|
|
*
|
|
* Callback to direct log messages to Linux trace buffers
|
|
*/
|
|
static __printf(2, 3)
|
|
void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
|
|
{
|
|
if (trace_ishtp_dump_enabled()) {
|
|
va_list args;
|
|
char tmp_buf[100];
|
|
|
|
va_start(args, format);
|
|
vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
|
|
va_end(args);
|
|
|
|
trace_ishtp_dump(tmp_buf);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ish_init() - Init function
|
|
* @dev: ishtp device
|
|
*
|
|
* This function initialize wait queues for suspend/resume and call
|
|
* calls hadware initialization function. This will initiate
|
|
* startup sequence
|
|
*
|
|
* Return: 0 for success or error code for failure
|
|
*/
|
|
static int ish_init(struct ishtp_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
/* Set the state of ISH HW to start */
|
|
ret = ish_hw_start(dev);
|
|
if (ret) {
|
|
dev_err(dev->devc, "ISH: hw start failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Start the inter process communication to ISH processor */
|
|
ret = ishtp_start(dev);
|
|
if (ret) {
|
|
dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct pci_device_id ish_invalid_pci_ids[] = {
|
|
/* Mehlow platform special pci ids */
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA309)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA30A)},
|
|
{}
|
|
};
|
|
|
|
/**
|
|
* ish_probe() - PCI driver probe callback
|
|
* @pdev: pci device
|
|
* @ent: pci device id
|
|
*
|
|
* Initialize PCI function, setup interrupt and call for ISH initialization
|
|
*
|
|
* Return: 0 for success or error code for failure
|
|
*/
|
|
static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
|
|
{
|
|
struct ishtp_device *dev;
|
|
struct ish_hw *hw;
|
|
int ret;
|
|
|
|
/* Check for invalid platforms for ISH support */
|
|
if (pci_dev_present(ish_invalid_pci_ids))
|
|
return -ENODEV;
|
|
|
|
/* enable pci dev */
|
|
ret = pci_enable_device(pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "ISH: Failed to enable PCI device\n");
|
|
return ret;
|
|
}
|
|
|
|
/* set PCI host mastering */
|
|
pci_set_master(pdev);
|
|
|
|
/* pci request regions for ISH driver */
|
|
ret = pci_request_regions(pdev, KBUILD_MODNAME);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
|
|
goto disable_device;
|
|
}
|
|
|
|
/* allocates and initializes the ISH dev structure */
|
|
dev = ish_dev_init(pdev);
|
|
if (!dev) {
|
|
ret = -ENOMEM;
|
|
goto release_regions;
|
|
}
|
|
hw = to_ish_hw(dev);
|
|
dev->print_log = ish_event_tracer;
|
|
|
|
/* mapping IO device memory */
|
|
hw->mem_addr = pci_iomap(pdev, 0, 0);
|
|
if (!hw->mem_addr) {
|
|
dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
|
|
ret = -ENOMEM;
|
|
goto free_device;
|
|
}
|
|
|
|
dev->pdev = pdev;
|
|
|
|
pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
|
|
|
|
/* request and enable interrupt */
|
|
ret = request_irq(pdev->irq, ish_irq_handler, IRQF_SHARED,
|
|
KBUILD_MODNAME, dev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
|
|
pdev->irq);
|
|
goto free_device;
|
|
}
|
|
|
|
dev_set_drvdata(dev->devc, dev);
|
|
|
|
init_waitqueue_head(&dev->suspend_wait);
|
|
init_waitqueue_head(&dev->resume_wait);
|
|
|
|
ret = ish_init(dev);
|
|
if (ret)
|
|
goto free_irq;
|
|
|
|
return 0;
|
|
|
|
free_irq:
|
|
free_irq(pdev->irq, dev);
|
|
free_device:
|
|
pci_iounmap(pdev, hw->mem_addr);
|
|
release_regions:
|
|
pci_release_regions(pdev);
|
|
disable_device:
|
|
pci_clear_master(pdev);
|
|
pci_disable_device(pdev);
|
|
dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ish_remove() - PCI driver remove callback
|
|
* @pdev: pci device
|
|
*
|
|
* This function does cleanup of ISH on pci remove callback
|
|
*/
|
|
static void ish_remove(struct pci_dev *pdev)
|
|
{
|
|
struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
|
|
struct ish_hw *hw = to_ish_hw(ishtp_dev);
|
|
|
|
ishtp_bus_remove_all_clients(ishtp_dev, false);
|
|
ish_device_disable(ishtp_dev);
|
|
|
|
free_irq(pdev->irq, ishtp_dev);
|
|
pci_iounmap(pdev, hw->mem_addr);
|
|
pci_release_regions(pdev);
|
|
pci_clear_master(pdev);
|
|
pci_disable_device(pdev);
|
|
}
|
|
|
|
static struct device __maybe_unused *ish_resume_device;
|
|
|
|
/* 50ms to get resume response */
|
|
#define WAIT_FOR_RESUME_ACK_MS 50
|
|
|
|
/**
|
|
* ish_resume_handler() - Work function to complete resume
|
|
* @work: work struct
|
|
*
|
|
* The resume work function to complete resume function asynchronously.
|
|
* There are two resume paths, one where ISH is not powered off,
|
|
* in that case a simple resume message is enough, others we need
|
|
* a reset sequence.
|
|
*/
|
|
static void __maybe_unused ish_resume_handler(struct work_struct *work)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(ish_resume_device);
|
|
struct ishtp_device *dev = pci_get_drvdata(pdev);
|
|
uint32_t fwsts;
|
|
int ret;
|
|
|
|
/* Get ISH FW status */
|
|
fwsts = IPC_GET_ISH_FWSTS(dev->ops->get_fw_status(dev));
|
|
|
|
/*
|
|
* If currently, in ISH FW, sensor app is loaded or beyond that,
|
|
* it means ISH isn't powered off, in this case, send a resume message.
|
|
*/
|
|
if (fwsts >= FWSTS_SENSOR_APP_LOADED) {
|
|
ishtp_send_resume(dev);
|
|
|
|
/* Waiting to get resume response */
|
|
if (dev->resume_flag)
|
|
ret = wait_event_interruptible_timeout(dev->resume_wait,
|
|
!dev->resume_flag,
|
|
msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
|
|
}
|
|
|
|
/*
|
|
* If in ISH FW, sensor app isn't loaded yet, or no resume response.
|
|
* That means this platform is not S0ix compatible, or something is
|
|
* wrong with ISH FW. So on resume, full reboot of ISH processor will
|
|
* happen, so need to go through init sequence again.
|
|
*/
|
|
if (dev->resume_flag)
|
|
ish_init(dev);
|
|
}
|
|
|
|
/**
|
|
* ish_suspend() - ISH suspend callback
|
|
* @device: device pointer
|
|
*
|
|
* ISH suspend callback
|
|
*
|
|
* Return: 0 to the pm core
|
|
*/
|
|
static int __maybe_unused ish_suspend(struct device *device)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(device);
|
|
struct ishtp_device *dev = pci_get_drvdata(pdev);
|
|
|
|
enable_irq_wake(pdev->irq);
|
|
/*
|
|
* If previous suspend hasn't been asnwered then ISH is likely dead,
|
|
* don't attempt nested notification
|
|
*/
|
|
if (dev->suspend_flag)
|
|
return 0;
|
|
|
|
dev->resume_flag = 0;
|
|
dev->suspend_flag = 1;
|
|
ishtp_send_suspend(dev);
|
|
|
|
/* 25 ms should be enough for live ISH to flush all IPC buf */
|
|
if (dev->suspend_flag)
|
|
wait_event_interruptible_timeout(dev->suspend_wait,
|
|
!dev->suspend_flag,
|
|
msecs_to_jiffies(25));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __maybe_unused DECLARE_WORK(resume_work, ish_resume_handler);
|
|
/**
|
|
* ish_resume() - ISH resume callback
|
|
* @device: device pointer
|
|
*
|
|
* ISH resume callback
|
|
*
|
|
* Return: 0 to the pm core
|
|
*/
|
|
static int __maybe_unused ish_resume(struct device *device)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(device);
|
|
struct ishtp_device *dev = pci_get_drvdata(pdev);
|
|
|
|
ish_resume_device = device;
|
|
dev->resume_flag = 1;
|
|
|
|
disable_irq_wake(pdev->irq);
|
|
schedule_work(&resume_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);
|
|
|
|
static struct pci_driver ish_driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.id_table = ish_pci_tbl,
|
|
.probe = ish_probe,
|
|
.remove = ish_remove,
|
|
.driver.pm = &ish_pm_ops,
|
|
};
|
|
|
|
module_pci_driver(ish_driver);
|
|
|
|
/* Original author */
|
|
MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
|
|
/* Adoption to upstream Linux kernel */
|
|
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
|
|
|
|
MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
|
|
MODULE_LICENSE("GPL");
|