Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mcb / mcb-pci.c

diff --git a/kernel/drivers/mcb/mcb-pci.c b/kernel/drivers/mcb/mcb-pci.c
new file mode 100644 (file)
index 0000000..de36237
--- /dev/null
+++ b/kernel/drivers/mcb/mcb-pci.c
@@ -0,0 +1,138 @@
+/*
+ * MEN Chameleon Bus.
+ *
+ * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
+ * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/mcb.h>
+
+#include "mcb-internal.h"
+
+struct priv {
+       struct mcb_bus *bus;
+       phys_addr_t mapbase;
+       void __iomem *base;
+};
+
+static int mcb_pci_get_irq(struct mcb_device *mdev)
+{
+       struct mcb_bus *mbus = mdev->bus;
+       struct device *dev = mbus->carrier;
+       struct pci_dev *pdev = to_pci_dev(dev);
+
+       return pdev->irq;
+}
+
+static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+       struct resource *res;
+       struct priv *priv;
+       int ret;
+       int num_cells;
+       unsigned long flags;
+
+       priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       ret = pci_enable_device(pdev);
+       if (ret) {
+               dev_err(&pdev->dev, "Failed to enable PCI device\n");
+               return -ENODEV;
+       }
+
+       priv->mapbase = pci_resource_start(pdev, 0);
+       if (!priv->mapbase) {
+               dev_err(&pdev->dev, "No PCI resource\n");
+               goto out_disable;
+       }
+
+       res = request_mem_region(priv->mapbase, CHAM_HEADER_SIZE,
+                                KBUILD_MODNAME);
+       if (!res) {
+               dev_err(&pdev->dev, "Failed to request PCI memory\n");
+               ret = -EBUSY;
+               goto out_disable;
+       }
+
+       priv->base = ioremap(priv->mapbase, CHAM_HEADER_SIZE);
+       if (!priv->base) {
+               dev_err(&pdev->dev, "Cannot ioremap\n");
+               ret = -ENOMEM;
+               goto out_release;
+       }
+
+       flags = pci_resource_flags(pdev, 0);
+       if (flags & IORESOURCE_IO) {
+               ret = -ENOTSUPP;
+               dev_err(&pdev->dev,
+                       "IO mapped PCI devices are not supported\n");
+               goto out_release;
+       }
+
+       pci_set_drvdata(pdev, priv);
+
+       priv->bus = mcb_alloc_bus(&pdev->dev);
+       if (IS_ERR(priv->bus)) {
+               ret = PTR_ERR(priv->bus);
+               goto out_iounmap;
+       }
+
+       priv->bus->get_irq = mcb_pci_get_irq;
+
+       ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
+       if (ret < 0)
+               goto out_iounmap;
+       num_cells = ret;
+
+       dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);
+
+       mcb_bus_add_devices(priv->bus);
+
+       return 0;
+
+out_iounmap:
+       iounmap(priv->base);
+out_release:
+       pci_release_region(pdev, 0);
+out_disable:
+       pci_disable_device(pdev);
+       return ret;
+}
+
+static void mcb_pci_remove(struct pci_dev *pdev)
+{
+       struct priv *priv = pci_get_drvdata(pdev);
+
+       mcb_release_bus(priv->bus);
+
+       iounmap(priv->base);
+       release_region(priv->mapbase, CHAM_HEADER_SIZE);
+       pci_disable_device(pdev);
+}
+
+static const struct pci_device_id mcb_pci_tbl[] = {
+       { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
+       { 0 },
+};
+MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
+
+static struct pci_driver mcb_pci_driver = {
+       .name = "mcb-pci",
+       .id_table = mcb_pci_tbl,
+       .probe = mcb_pci_probe,
+       .remove = mcb_pci_remove,
+};
+
+module_pci_driver(mcb_pci_driver);
+
+MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MCB over PCI support");