mei: txe: add pci-txe.c

register txe hardware with pci bus
and add pci pm handlers

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 293 insertions, 0 deletions

diff --git a/drivers/misc/mei/pci-txe.c b/drivers/misc/mei/pci-txe.c
new file mode 100644
index 000000000000..af4412cf2456
--- /dev/null
+++ b/drivers/misc/mei/pci-txe.c
@@ -0,0 +1,293 @@
+/*
+ *
+ * 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");