1 files changed, 273 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/pSeries_vio.c b/arch/ppc64/kernel/pSeries_vio.c
new file mode 100644
index 000000000000..e0ae06f58f86
--- /dev/null
+++ b/arch/ppc64/kernel/pSeries_vio.c
@@ -0,0 +1,273 @@
+/*
+ * IBM PowerPC pSeries Virtual I/O Infrastructure Support.
+ *
+ *    Copyright (c) 2003-2005 IBM Corp.
+ *     Dave Engebretsen engebret@us.ibm.com
+ *     Santiago Leon santil@us.ibm.com
+ *     Hollis Blanchard <hollisb@us.ibm.com>
+ *     Stephen Rothwell
+ *
+ *      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; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/kobject.h>
+#include <asm/iommu.h>
+#include <asm/dma.h>
+#include <asm/prom.h>
+#include <asm/vio.h>
+#include <asm/hvcall.h>
+
+extern struct subsystem devices_subsys; /* needed for vio_find_name() */
+
+static void probe_bus_pseries(void)
+{
+        struct device_node *node_vroot, *of_node;
+
+        node_vroot = find_devices("vdevice");
+        if ((node_vroot == NULL) || (node_vroot->child == NULL))
+                /* this machine doesn't do virtual IO, and that's ok */
+                return;
+
+        /*
+         * Create struct vio_devices for each virtual device in the device tree.
+         * Drivers will associate with them later.
+         */
+        for (of_node = node_vroot->child; of_node != NULL;
+                        of_node = of_node->sibling) {
+                printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
+                vio_register_device_node(of_node);
+        }
+}
+
+/**
+ * vio_match_device_pseries: - Tell if a pSeries VIO device matches a
+ *      vio_device_id
+ */
+static int vio_match_device_pseries(const struct vio_device_id *id,
+                const struct vio_dev *dev)
+{
+        return (strncmp(dev->type, id->type, strlen(id->type)) == 0) &&
+                        device_is_compatible(dev->dev.platform_data, id->compat);
+}
+
+static void vio_release_device_pseries(struct device *dev)
+{
+        /* XXX free TCE table */
+        of_node_put(dev->platform_data);
+}
+
+static ssize_t viodev_show_devspec(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct device_node *of_node = dev->platform_data;
+
+        return sprintf(buf, "%s\n", of_node->full_name);
+}
+DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
+
+static void vio_unregister_device_pseries(struct vio_dev *viodev)
+{
+        device_remove_file(&viodev->dev, &dev_attr_devspec);
+}
+
+static struct vio_bus_ops vio_bus_ops_pseries = {
+        .match = vio_match_device_pseries,
+        .unregister_device = vio_unregister_device_pseries,
+        .release_device = vio_release_device_pseries,
+};
+
+/**
+ * vio_bus_init_pseries: - Initialize the pSeries virtual IO bus
+ */
+static int __init vio_bus_init_pseries(void)
+{
+        int err;
+
+        err = vio_bus_init(&vio_bus_ops_pseries);
+        if (err == 0)
+                probe_bus_pseries();
+        return err;
+}
+
+__initcall(vio_bus_init_pseries);
+
+/**
+ * vio_build_iommu_table: - gets the dma information from OF and
+ *      builds the TCE tree.
+ * @dev: the virtual device.
+ *
+ * Returns a pointer to the built tce tree, or NULL if it can't
+ * find property.
+*/
+static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
+{
+        unsigned int *dma_window;
+        struct iommu_table *newTceTable;
+        unsigned long offset;
+        int dma_window_property_size;
+
+        dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
+        if(!dma_window) {
+                return NULL;
+        }
+
+        newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
+
+        /*  There should be some code to extract the phys-encoded offset
+                using prom_n_addr_cells(). However, according to a comment
+                on earlier versions, it's always zero, so we don't bother */
+        offset = dma_window[1] >>  PAGE_SHIFT;
+
+        /* TCE table size - measured in tce entries */
+        newTceTable->it_size            = dma_window[4] >> PAGE_SHIFT;
+        /* offset for VIO should always be 0 */
+        newTceTable->it_offset          = offset;
+        newTceTable->it_busno           = 0;
+        newTceTable->it_index           = (unsigned long)dma_window[0];
+        newTceTable->it_type            = TCE_VB;
+
+        return iommu_init_table(newTceTable);
+}
+
+/**
+ * vio_register_device_node: - Register a new vio device.
+ * @of_node:    The OF node for this device.
+ *
+ * Creates and initializes a vio_dev structure from the data in
+ * of_node (dev.platform_data) and adds it to the list of virtual devices.
+ * Returns a pointer to the created vio_dev or NULL if node has
+ * NULL device_type or compatible fields.
+ */
+struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
+{
+        struct vio_dev *viodev;
+        unsigned int *unit_address;
+        unsigned int *irq_p;
+
+        /* we need the 'device_type' property, in order to match with drivers */
+        if ((NULL == of_node->type)) {
+                printk(KERN_WARNING
+                        "%s: node %s missing 'device_type'\n", __FUNCTION__,
+                        of_node->name ? of_node->name : "<unknown>");
+                return NULL;
+        }
+
+        unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
+        if (!unit_address) {
+                printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
+                        of_node->name ? of_node->name : "<unknown>");
+                return NULL;
+        }
+
+        /* allocate a vio_dev for this node */
+        viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
+        if (!viodev) {
+                return NULL;
+        }
+        memset(viodev, 0, sizeof(struct vio_dev));
+
+        viodev->dev.platform_data = of_node_get(of_node);
+
+        viodev->irq = NO_IRQ;
+        irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
+        if (irq_p) {
+                int virq = virt_irq_create_mapping(*irq_p);
+                if (virq == NO_IRQ) {
+                        printk(KERN_ERR "Unable to allocate interrupt "
+                               "number for %s\n", of_node->full_name);
+                } else
+                        viodev->irq = irq_offset_up(virq);
+        }
+
+        snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
+        viodev->name = of_node->name;
+        viodev->type = of_node->type;
+        viodev->unit_address = *unit_address;
+        viodev->iommu_table = vio_build_iommu_table(viodev);
+
+        /* register with generic device framework */
+        if (vio_register_device(viodev) == NULL) {
+                /* XXX free TCE table */
+                kfree(viodev);
+                return NULL;
+        }
+        device_create_file(&viodev->dev, &dev_attr_devspec);
+
+        return viodev;
+}
+EXPORT_SYMBOL(vio_register_device_node);
+
+/**
+ * vio_get_attribute: - get attribute for virtual device
+ * @vdev:       The vio device to get property.
+ * @which:      The property/attribute to be extracted.
+ * @length:     Pointer to length of returned data size (unused if NULL).
+ *
+ * Calls prom.c's get_property() to return the value of the
+ * attribute specified by the preprocessor constant @which
+*/
+const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
+{
+        return get_property(vdev->dev.platform_data, (char*)which, length);
+}
+EXPORT_SYMBOL(vio_get_attribute);
+
+/* vio_find_name() - internal because only vio.c knows how we formatted the
+ * kobject name
+ * XXX once vio_bus_type.devices is actually used as a kset in
+ * drivers/base/bus.c, this function should be removed in favor of
+ * "device_find(kobj_name, &vio_bus_type)"
+ */
+static struct vio_dev *vio_find_name(const char *kobj_name)
+{
+        struct kobject *found;
+
+        found = kset_find_obj(&devices_subsys.kset, kobj_name);
+        if (!found)
+                return NULL;
+
+        return to_vio_dev(container_of(found, struct device, kobj));
+}
+
+/**
+ * vio_find_node - find an already-registered vio_dev
+ * @vnode: device_node of the virtual device we're looking for
+ */
+struct vio_dev *vio_find_node(struct device_node *vnode)
+{
+        uint32_t *unit_address;
+        char kobj_name[BUS_ID_SIZE];
+
+        /* construct the kobject name from the device node */
+        unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
+        if (!unit_address)
+                return NULL;
+        snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
+
+        return vio_find_name(kobj_name);
+}
+EXPORT_SYMBOL(vio_find_node);
+
+int vio_enable_interrupts(struct vio_dev *dev)
+{
+        int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
+        if (rc != H_Success)
+                printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
+        return rc;
+}
+EXPORT_SYMBOL(vio_enable_interrupts);
+
+int vio_disable_interrupts(struct vio_dev *dev)
+{
+        int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
+        if (rc != H_Success)
+                printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
+        return rc;
+}
+EXPORT_SYMBOL(vio_disable_interrupts);