mei: txe: add pci-txe.c

/*

 *

 * Intel Management Engine Interface (Intel MEI) Linux driver

 * Copyright (c) 2013-2014, 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/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/mei.h>

#include "mei_dev.h"

#include "hw-txe.h"

static DEFINE_PCI_DEVICE_TABLE(mei_txe_pci_tbl) = {

	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0F18)}, /* Baytrail */

	{0, }

};

MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);

static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw)

{

	int i;

	for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {

		if (hw->mem_addr[i]) {

			pci_iounmap(pdev, hw->mem_addr[i]);

			hw->mem_addr[i] = NULL;

		}

	}

}

/**

 * mei_probe - Device Initialization Routine

 *

 * @pdev: PCI device structure

 * @ent: entry in mei_txe_pci_tbl

 *

 * returns 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;

	int err;

	int i;

	/* enable pci dev */

	err = pci_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 for mei driver */

	err = pci_request_regions(pdev, KBUILD_MODNAME);

	if (err) {

		dev_err(&pdev->dev, "failed to get pci regions.\n");

		goto disable_device;

	}

	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 release_regions;

		}

	}

	/* allocates and initializes the mei dev structure */

	dev = mei_txe_dev_init(pdev);

	if (!dev) {

		err = -ENOMEM;

		goto release_regions;

	}

	hw = to_txe_hw(dev);

	/* mapping  IO device memory */

	for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {

		hw->mem_addr[i] = pci_iomap(pdev, i, 0);

		if (!hw->mem_addr[i]) {

			dev_err(&pdev->dev, "mapping I/O device memory failure.\n");

			err = -ENOMEM;

			goto free_device;

		}

	}

	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 free_device;

	}

	if (mei_start(dev)) {

		dev_err(&pdev->dev, "init hw failure.\n");

		err = -ENODEV;

		goto release_irq;

	}

	err = mei_register(dev);

	if (err)

		goto release_irq;

	pci_set_drvdata(pdev, dev);

	return 0;

release_irq:

	mei_cancel_work(dev);

	/* disable interrupts */

	mei_disable_interrupts(dev);

	free_irq(pdev->irq, dev);

	pci_disable_msi(pdev);

free_device:

	mei_txe_pci_iounmap(pdev, hw);

	kfree(dev);

release_regions:

	pci_release_regions(pdev);

disable_device:

	pci_disable_device(pdev);

end:

	dev_err(&pdev->dev, "initialization failed.\n");

	return err;

}

/**

 * mei_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;

	struct mei_txe_hw *hw;

	dev = pci_get_drvdata(pdev);

	if (!dev) {

		dev_err(&pdev->dev, "mei: dev =NULL\n");

		return;

	}

	hw = to_txe_hw(dev);

	mei_stop(dev);

	/* disable interrupts */

	mei_disable_interrupts(dev);

	free_irq(pdev->irq, dev);

	pci_disable_msi(pdev);

	pci_set_drvdata(pdev, NULL);

	mei_txe_pci_iounmap(pdev, hw);

	mei_deregister(dev);

	kfree(dev);

	pci_release_regions(pdev);

	pci_disable_device(pdev);

}

#ifdef CONFIG_PM

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;

}

static SIMPLE_DEV_PM_OPS(mei_txe_pm_ops,

			 mei_txe_pci_suspend,

			 mei_txe_pci_resume);

#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_remove,

	.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");