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linux-next/drivers/misc/mei/pci-txe.c
Tomas Winkler 1e55b609b9 mei: adjust the copyright notice in the files.
Use unified version of the copyright notice in the files
Update copyright years according the year the files
were touched, except this patch and SPDX conversions.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-28 02:07:54 +09:00

413 lines
8.9 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2013-2017, Intel Corporation. All rights reserved.
* Intel Management Engine Interface (Intel MEI) Linux driver
*/
#include <linux/module.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/init.h>
#include <linux/sched.h>
#include <linux/uuid.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/mei.h>
#include "mei_dev.h"
#include "hw-txe.h"
static const struct pci_device_id mei_txe_pci_tbl[] = {
{PCI_VDEVICE(INTEL, 0x0F18)}, /* Baytrail */
{PCI_VDEVICE(INTEL, 0x2298)}, /* Cherrytrail */
{0, }
};
MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);
#ifdef CONFIG_PM
static inline void mei_txe_set_pm_domain(struct mei_device *dev);
static inline void mei_txe_unset_pm_domain(struct mei_device *dev);
#else
static inline void mei_txe_set_pm_domain(struct mei_device *dev) {}
static inline void mei_txe_unset_pm_domain(struct mei_device *dev) {}
#endif /* CONFIG_PM */
/**
* mei_txe_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in mei_txe_pci_tbl
*
* Return: 0 on success, <0 on failure.
*/
static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct mei_device *dev;
struct mei_txe_hw *hw;
const int mask = BIT(SEC_BAR) | BIT(BRIDGE_BAR);
int err;
/* enable pci dev */
err = pcim_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "failed to enable pci device.\n");
goto end;
}
/* set PCI host mastering */
pci_set_master(pdev);
/* pci request regions and mapping IO device memory for mei driver */
err = pcim_iomap_regions(pdev, mask, KBUILD_MODNAME);
if (err) {
dev_err(&pdev->dev, "failed to get pci regions.\n");
goto end;
}
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
if (err) {
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (err) {
dev_err(&pdev->dev, "No suitable DMA available.\n");
goto end;
}
}
/* allocates and initializes the mei dev structure */
dev = mei_txe_dev_init(pdev);
if (!dev) {
err = -ENOMEM;
goto end;
}
hw = to_txe_hw(dev);
hw->mem_addr = pcim_iomap_table(pdev);
pci_enable_msi(pdev);
/* clear spurious interrupts */
mei_clear_interrupts(dev);
/* request and enable interrupt */
if (pci_dev_msi_enabled(pdev))
err = request_threaded_irq(pdev->irq,
NULL,
mei_txe_irq_thread_handler,
IRQF_ONESHOT, KBUILD_MODNAME, dev);
else
err = request_threaded_irq(pdev->irq,
mei_txe_irq_quick_handler,
mei_txe_irq_thread_handler,
IRQF_SHARED, KBUILD_MODNAME, dev);
if (err) {
dev_err(&pdev->dev, "mei: request_threaded_irq failure. irq = %d\n",
pdev->irq);
goto end;
}
if (mei_start(dev)) {
dev_err(&pdev->dev, "init hw failure.\n");
err = -ENODEV;
goto release_irq;
}
pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_TXI_RPM_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
err = mei_register(dev, &pdev->dev);
if (err)
goto stop;
pci_set_drvdata(pdev, dev);
/*
* MEI requires to resume from runtime suspend mode
* in order to perform link reset flow upon system suspend.
*/
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NEVER_SKIP);
/*
* TXE maps runtime suspend/resume to own power gating states,
* hence we need to go around native PCI runtime service which
* eventually brings the device into D3cold/hot state.
* But the TXE device cannot wake up from D3 unlike from own
* power gating. To get around PCI device native runtime pm,
* TXE uses runtime pm domain handlers which take precedence.
*/
mei_txe_set_pm_domain(dev);
pm_runtime_put_noidle(&pdev->dev);
return 0;
stop:
mei_stop(dev);
release_irq:
mei_cancel_work(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
end:
dev_err(&pdev->dev, "initialization failed.\n");
return err;
}
/**
* mei_txe_remove - Device Shutdown Routine
*
* @pdev: PCI device structure
*
* mei_txe_shutdown is called from the reboot notifier
* it's a simplified version of remove so we go down
* faster.
*/
static void mei_txe_shutdown(struct pci_dev *pdev)
{
struct mei_device *dev;
dev = pci_get_drvdata(pdev);
if (!dev)
return;
dev_dbg(&pdev->dev, "shutdown\n");
mei_stop(dev);
mei_txe_unset_pm_domain(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
}
/**
* mei_txe_remove - Device Removal Routine
*
* @pdev: PCI device structure
*
* mei_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device.
*/
static void mei_txe_remove(struct pci_dev *pdev)
{
struct mei_device *dev;
dev = pci_get_drvdata(pdev);
if (!dev) {
dev_err(&pdev->dev, "mei: dev == NULL\n");
return;
}
pm_runtime_get_noresume(&pdev->dev);
mei_stop(dev);
mei_txe_unset_pm_domain(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
mei_deregister(dev);
}
#ifdef CONFIG_PM_SLEEP
static int mei_txe_pci_suspend(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
dev_dbg(&pdev->dev, "suspend\n");
mei_stop(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
pci_disable_msi(pdev);
return 0;
}
static int mei_txe_pci_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
int err;
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
pci_enable_msi(pdev);
mei_clear_interrupts(dev);
/* request and enable interrupt */
if (pci_dev_msi_enabled(pdev))
err = request_threaded_irq(pdev->irq,
NULL,
mei_txe_irq_thread_handler,
IRQF_ONESHOT, KBUILD_MODNAME, dev);
else
err = request_threaded_irq(pdev->irq,
mei_txe_irq_quick_handler,
mei_txe_irq_thread_handler,
IRQF_SHARED, KBUILD_MODNAME, dev);
if (err) {
dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
pdev->irq);
return err;
}
err = mei_restart(dev);
return err;
}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
static int mei_txe_pm_runtime_idle(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
dev_dbg(&pdev->dev, "rpm: txe: runtime_idle\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
if (mei_write_is_idle(dev))
pm_runtime_autosuspend(device);
return -EBUSY;
}
static int mei_txe_pm_runtime_suspend(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
int ret;
dev_dbg(&pdev->dev, "rpm: txe: runtime suspend\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
if (mei_write_is_idle(dev))
ret = mei_txe_aliveness_set_sync(dev, 0);
else
ret = -EAGAIN;
/* keep irq on we are staying in D0 */
dev_dbg(&pdev->dev, "rpm: txe: runtime suspend ret=%d\n", ret);
mutex_unlock(&dev->device_lock);
if (ret && ret != -EAGAIN)
schedule_work(&dev->reset_work);
return ret;
}
static int mei_txe_pm_runtime_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
int ret;
dev_dbg(&pdev->dev, "rpm: txe: runtime resume\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
mei_enable_interrupts(dev);
ret = mei_txe_aliveness_set_sync(dev, 1);
mutex_unlock(&dev->device_lock);
dev_dbg(&pdev->dev, "rpm: txe: runtime resume ret = %d\n", ret);
if (ret)
schedule_work(&dev->reset_work);
return ret;
}
/**
* mei_txe_set_pm_domain - fill and set pm domain structure for device
*
* @dev: mei_device
*/
static inline void mei_txe_set_pm_domain(struct mei_device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev->dev);
if (pdev->dev.bus && pdev->dev.bus->pm) {
dev->pg_domain.ops = *pdev->dev.bus->pm;
dev->pg_domain.ops.runtime_suspend = mei_txe_pm_runtime_suspend;
dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;
dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
}
}
/**
* mei_txe_unset_pm_domain - clean pm domain structure for device
*
* @dev: mei_device
*/
static inline void mei_txe_unset_pm_domain(struct mei_device *dev)
{
/* stop using pm callbacks if any */
dev_pm_domain_set(dev->dev, NULL);
}
static const struct dev_pm_ops mei_txe_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mei_txe_pci_suspend,
mei_txe_pci_resume)
SET_RUNTIME_PM_OPS(
mei_txe_pm_runtime_suspend,
mei_txe_pm_runtime_resume,
mei_txe_pm_runtime_idle)
};
#define MEI_TXE_PM_OPS (&mei_txe_pm_ops)
#else
#define MEI_TXE_PM_OPS NULL
#endif /* CONFIG_PM */
/*
* PCI driver structure
*/
static struct pci_driver mei_txe_driver = {
.name = KBUILD_MODNAME,
.id_table = mei_txe_pci_tbl,
.probe = mei_txe_probe,
.remove = mei_txe_remove,
.shutdown = mei_txe_shutdown,
.driver.pm = MEI_TXE_PM_OPS,
};
module_pci_driver(mei_txe_driver);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) Trusted Execution Environment Interface");
MODULE_LICENSE("GPL v2");