407 lines
10 KiB
C
407 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* PCI glue for ISHTP provider device (ISH) driver
|
|
*
|
|
* Copyright (c) 2014-2016, Intel Corporation.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#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/suspend.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)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CML_LP_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CMP_H_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, EHL_Ax_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_LP_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_H_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_S_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_P_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_N_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, RPL_S_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MTL_P_DEVICE_ID)},
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ARL_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)},
|
|
{}
|
|
};
|
|
|
|
static inline bool ish_should_enter_d0i3(struct pci_dev *pdev)
|
|
{
|
|
return !pm_suspend_via_firmware() || pdev->device == CHV_DEVICE_ID;
|
|
}
|
|
|
|
static inline bool ish_should_leave_d0i3(struct pci_dev *pdev)
|
|
{
|
|
return !pm_resume_via_firmware() || pdev->device == CHV_DEVICE_ID;
|
|
}
|
|
|
|
static int enable_gpe(struct device *dev)
|
|
{
|
|
#ifdef CONFIG_ACPI
|
|
acpi_status acpi_sts;
|
|
struct acpi_device *adev;
|
|
struct acpi_device_wakeup *wakeup;
|
|
|
|
adev = ACPI_COMPANION(dev);
|
|
if (!adev) {
|
|
dev_err(dev, "get acpi handle failed\n");
|
|
return -ENODEV;
|
|
}
|
|
wakeup = &adev->wakeup;
|
|
|
|
acpi_sts = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
|
|
if (ACPI_FAILURE(acpi_sts)) {
|
|
dev_err(dev, "enable ose_gpe failed\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
#else
|
|
return -ENODEV;
|
|
#endif
|
|
}
|
|
|
|
static void enable_pme_wake(struct pci_dev *pdev)
|
|
{
|
|
if ((pci_pme_capable(pdev, PCI_D0) ||
|
|
pci_pme_capable(pdev, PCI_D3hot) ||
|
|
pci_pme_capable(pdev, PCI_D3cold)) && !enable_gpe(&pdev->dev)) {
|
|
pci_pme_active(pdev, true);
|
|
dev_dbg(&pdev->dev, "ish ipc driver pme wake enabled\n");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret;
|
|
struct ish_hw *hw;
|
|
unsigned long irq_flag = 0;
|
|
struct ishtp_device *ishtp;
|
|
struct device *dev = &pdev->dev;
|
|
|
|
/* Check for invalid platforms for ISH support */
|
|
if (pci_dev_present(ish_invalid_pci_ids))
|
|
return -ENODEV;
|
|
|
|
/* enable pci dev */
|
|
ret = pcim_enable_device(pdev);
|
|
if (ret) {
|
|
dev_err(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 = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
|
|
if (ret) {
|
|
dev_err(dev, "ISH: Failed to get PCI regions\n");
|
|
return ret;
|
|
}
|
|
|
|
/* allocates and initializes the ISH dev structure */
|
|
ishtp = ish_dev_init(pdev);
|
|
if (!ishtp) {
|
|
ret = -ENOMEM;
|
|
return ret;
|
|
}
|
|
hw = to_ish_hw(ishtp);
|
|
ishtp->print_log = ish_event_tracer;
|
|
|
|
/* mapping IO device memory */
|
|
hw->mem_addr = pcim_iomap_table(pdev)[0];
|
|
ishtp->pdev = pdev;
|
|
|
|
/* request and enable interrupt */
|
|
ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
|
|
if (!pdev->msi_enabled && !pdev->msix_enabled)
|
|
irq_flag = IRQF_SHARED;
|
|
|
|
ret = devm_request_irq(dev, pdev->irq, ish_irq_handler,
|
|
irq_flag, KBUILD_MODNAME, ishtp);
|
|
if (ret) {
|
|
dev_err(dev, "ISH: request IRQ %d failed\n", pdev->irq);
|
|
return ret;
|
|
}
|
|
|
|
dev_set_drvdata(ishtp->devc, ishtp);
|
|
|
|
init_waitqueue_head(&ishtp->suspend_wait);
|
|
init_waitqueue_head(&ishtp->resume_wait);
|
|
|
|
/* Enable PME for EHL */
|
|
if (pdev->device == EHL_Ax_DEVICE_ID)
|
|
enable_pme_wake(pdev);
|
|
|
|
ret = ish_init(ishtp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
ishtp_bus_remove_all_clients(ishtp_dev, false);
|
|
ish_device_disable(ishtp_dev);
|
|
}
|
|
|
|
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 = dev->ops->get_fw_status(dev);
|
|
|
|
if (ish_should_leave_d0i3(pdev) && !dev->suspend_flag
|
|
&& IPC_IS_ISH_ILUP(fwsts)) {
|
|
if (device_may_wakeup(&pdev->dev))
|
|
disable_irq_wake(pdev->irq);
|
|
|
|
ish_set_host_ready(dev);
|
|
|
|
ishtp_send_resume(dev);
|
|
|
|
/* Waiting to get resume response */
|
|
if (dev->resume_flag)
|
|
wait_event_interruptible_timeout(dev->resume_wait,
|
|
!dev->resume_flag,
|
|
msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
|
|
|
|
/*
|
|
* If the flag is not cleared, something is wrong with ISH FW.
|
|
* So on resume, need to go through init sequence again.
|
|
*/
|
|
if (dev->resume_flag)
|
|
ish_init(dev);
|
|
} else {
|
|
/*
|
|
* Resume from the D3, full reboot of ISH processor will happen,
|
|
* so need to go through init sequence again.
|
|
*/
|
|
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);
|
|
|
|
if (ish_should_enter_d0i3(pdev)) {
|
|
/*
|
|
* 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));
|
|
|
|
if (dev->suspend_flag) {
|
|
/*
|
|
* It looks like FW halt, clear the DMA bit, and put
|
|
* ISH into D3, and FW would reset on resume.
|
|
*/
|
|
ish_disable_dma(dev);
|
|
} else {
|
|
/*
|
|
* Save state so PCI core will keep the device at D0,
|
|
* the ISH would enter D0i3
|
|
*/
|
|
pci_save_state(pdev);
|
|
|
|
if (device_may_wakeup(&pdev->dev))
|
|
enable_irq_wake(pdev->irq);
|
|
}
|
|
} else {
|
|
/*
|
|
* Clear the DMA bit before putting ISH into D3,
|
|
* or ISH FW would reset automatically.
|
|
*/
|
|
ish_disable_dma(dev);
|
|
}
|
|
|
|
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);
|
|
|
|
/* add this to finish power flow for EHL */
|
|
if (dev->pdev->device == EHL_Ax_DEVICE_ID) {
|
|
pci_set_power_state(pdev, PCI_D0);
|
|
enable_pme_wake(pdev);
|
|
dev_dbg(dev->devc, "set power state to D0 for ehl\n");
|
|
}
|
|
|
|
ish_resume_device = device;
|
|
dev->resume_flag = 1;
|
|
|
|
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");
|