1 files changed, 181 insertions, 0 deletions

diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
new file mode 100644
index 000000000000..a0ee5d06f715
--- /dev/null
+++ b/drivers/xen/platform-pci.c
@@ -0,0 +1,181 @@
+/******************************************************************************
+ * platform-pci.c
+ *
+ * Xen platform PCI device driver
+ * Copyright (c) 2005, Intel Corporation.
+ * Copyright (c) 2007, XenSource Inc.
+ * Copyright (c) 2010, Citrix
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ */
+
+
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <xen/grant_table.h>
+#include <xen/xenbus.h>
+#include <xen/events.h>
+#include <xen/hvm.h>
+
+#define DRV_NAME    "xen-platform-pci"
+
+MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
+MODULE_DESCRIPTION("Xen platform PCI device");
+MODULE_LICENSE("GPL");
+
+static unsigned long platform_mmio;
+static unsigned long platform_mmio_alloc;
+static unsigned long platform_mmiolen;
+
+unsigned long alloc_xen_mmio(unsigned long len)
+{
+        unsigned long addr;
+
+        addr = platform_mmio + platform_mmio_alloc;
+        platform_mmio_alloc += len;
+        BUG_ON(platform_mmio_alloc > platform_mmiolen);
+
+        return addr;
+}
+
+static uint64_t get_callback_via(struct pci_dev *pdev)
+{
+        u8 pin;
+        int irq;
+
+        irq = pdev->irq;
+        if (irq < 16)
+                return irq; /* ISA IRQ */
+
+        pin = pdev->pin;
+
+        /* We don't know the GSI. Specify the PCI INTx line instead. */
+        return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */
+                ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
+                ((uint64_t)pdev->bus->number << 16) |
+                ((uint64_t)(pdev->devfn & 0xff) << 8) |
+                ((uint64_t)(pin - 1) & 3);
+}
+
+static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
+{
+        xen_hvm_evtchn_do_upcall();
+        return IRQ_HANDLED;
+}
+
+static int xen_allocate_irq(struct pci_dev *pdev)
+{
+        return request_irq(pdev->irq, do_hvm_evtchn_intr,
+                        IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
+                        "xen-platform-pci", pdev);
+}
+
+static int __devinit platform_pci_init(struct pci_dev *pdev,
+                                       const struct pci_device_id *ent)
+{
+        int i, ret;
+        long ioaddr, iolen;
+        long mmio_addr, mmio_len;
+        uint64_t callback_via;
+        unsigned int max_nr_gframes;
+
+        i = pci_enable_device(pdev);
+        if (i)
+                return i;
+
+        ioaddr = pci_resource_start(pdev, 0);
+        iolen = pci_resource_len(pdev, 0);
+
+        mmio_addr = pci_resource_start(pdev, 1);
+        mmio_len = pci_resource_len(pdev, 1);
+
+        if (mmio_addr == 0 || ioaddr == 0) {
+                dev_err(&pdev->dev, "no resources found\n");
+                ret = -ENOENT;
+                goto pci_out;
+        }
+
+        if (request_mem_region(mmio_addr, mmio_len, DRV_NAME) == NULL) {
+                dev_err(&pdev->dev, "MEM I/O resource 0x%lx @ 0x%lx busy\n",
+                       mmio_addr, mmio_len);
+                ret = -EBUSY;
+                goto pci_out;
+        }
+
+        if (request_region(ioaddr, iolen, DRV_NAME) == NULL) {
+                dev_err(&pdev->dev, "I/O resource 0x%lx @ 0x%lx busy\n",
+                       iolen, ioaddr);
+                ret = -EBUSY;
+                goto mem_out;
+        }
+
+        platform_mmio = mmio_addr;
+        platform_mmiolen = mmio_len;
+
+        if (!xen_have_vector_callback) {
+                ret = xen_allocate_irq(pdev);
+                if (ret) {
+                        dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
+                        goto out;
+                }
+                callback_via = get_callback_via(pdev);
+                ret = xen_set_callback_via(callback_via);
+                if (ret) {
+                        dev_warn(&pdev->dev, "Unable to set the evtchn callback "
+                                         "err=%d\n", ret);
+                        goto out;
+                }
+        }
+
+        max_nr_gframes = gnttab_max_grant_frames();
+        xen_hvm_resume_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
+        ret = gnttab_init();
+        if (ret)
+                goto out;
+        xenbus_probe(NULL);
+        return 0;
+
+out:
+        release_region(ioaddr, iolen);
+mem_out:
+        release_mem_region(mmio_addr, mmio_len);
+pci_out:
+        pci_disable_device(pdev);
+        return ret;
+}
+
+static struct pci_device_id platform_pci_tbl[] __devinitdata = {
+        {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+        {0,}
+};
+
+MODULE_DEVICE_TABLE(pci, platform_pci_tbl);
+
+static struct pci_driver platform_driver = {
+        .name =           DRV_NAME,
+        .probe =          platform_pci_init,
+        .id_table =       platform_pci_tbl,
+};
+
+static int __init platform_pci_module_init(void)
+{
+        return pci_register_driver(&platform_driver);
+}
+
+module_init(platform_pci_module_init);