348 lines
7.2 KiB
C
348 lines
7.2 KiB
C
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/* vio.c: Virtual I/O channel devices probing infrastructure.
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*
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* Copyright (c) 2003-2005 IBM Corp.
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* Dave Engebretsen engebret@us.ibm.com
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* Santiago Leon santil@us.ibm.com
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* Hollis Blanchard <hollisb@us.ibm.com>
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* Stephen Rothwell
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*
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* Adapted to sparc64 by David S. Miller davem@davemloft.net
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*/
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#include <linux/kernel.h>
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#include <linux/irq.h>
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#include <linux/init.h>
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#include <asm/mdesc.h>
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#include <asm/vio.h>
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static inline int find_in_proplist(const char *list, const char *match,
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int len)
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{
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while (len > 0) {
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int l;
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if (!strcmp(list, match))
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return 1;
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l = strlen(list) + 1;
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list += l;
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len -= l;
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}
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return 0;
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}
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static const struct vio_device_id *vio_match_device(
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const struct vio_device_id *matches,
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const struct vio_dev *dev)
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{
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const char *type, *compat;
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int len;
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type = dev->type;
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compat = dev->compat;
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len = dev->compat_len;
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while (matches->type[0] || matches->compat[0]) {
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int match = 1;
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if (matches->type[0]) {
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match &= type
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&& !strcmp(matches->type, type);
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}
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if (matches->compat[0]) {
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match &= compat &&
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find_in_proplist(compat, matches->compat, len);
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}
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if (match)
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return matches;
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matches++;
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}
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return NULL;
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}
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static int vio_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct vio_dev *vio_dev = to_vio_dev(dev);
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struct vio_driver *vio_drv = to_vio_driver(drv);
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const struct vio_device_id *matches = vio_drv->id_table;
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if (!matches)
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return 0;
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return vio_match_device(matches, vio_dev) != NULL;
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}
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static int vio_device_probe(struct device *dev)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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struct vio_driver *drv = to_vio_driver(dev->driver);
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const struct vio_device_id *id;
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int error = -ENODEV;
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if (drv->probe) {
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id = vio_match_device(drv->id_table, vdev);
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if (id)
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error = drv->probe(vdev, id);
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}
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return error;
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}
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static int vio_device_remove(struct device *dev)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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struct vio_driver *drv = to_vio_driver(dev->driver);
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if (drv->remove)
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return drv->remove(vdev);
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return 1;
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}
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static ssize_t devspec_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct vio_dev *vdev = to_vio_dev(dev);
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const char *str = "none";
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if (vdev->type) {
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if (!strcmp(vdev->type, "network"))
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str = "vnet";
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else if (!strcmp(vdev->type, "block"))
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str = "vdisk";
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}
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return sprintf(buf, "%s\n", str);
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}
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static struct device_attribute vio_dev_attrs[] = {
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__ATTR_RO(devspec),
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__ATTR_NULL
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};
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static struct bus_type vio_bus_type = {
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.name = "vio",
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.dev_attrs = vio_dev_attrs,
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.match = vio_bus_match,
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.probe = vio_device_probe,
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.remove = vio_device_remove,
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};
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int vio_register_driver(struct vio_driver *viodrv)
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{
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viodrv->driver.bus = &vio_bus_type;
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return driver_register(&viodrv->driver);
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}
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EXPORT_SYMBOL(vio_register_driver);
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void vio_unregister_driver(struct vio_driver *viodrv)
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{
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driver_unregister(&viodrv->driver);
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}
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EXPORT_SYMBOL(vio_unregister_driver);
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struct mdesc_node *vio_find_endpoint(struct vio_dev *vdev)
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{
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struct mdesc_node *endp, *mp = vdev->mp;
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int i;
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endp = NULL;
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for (i = 0; i < mp->num_arcs; i++) {
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struct mdesc_node *t;
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if (strcmp(mp->arcs[i].name, "fwd"))
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continue;
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t = mp->arcs[i].arc;
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if (strcmp(t->name, "channel-endpoint"))
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continue;
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endp = t;
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break;
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}
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return endp;
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}
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EXPORT_SYMBOL(vio_find_endpoint);
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static void __devinit vio_dev_release(struct device *dev)
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{
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kfree(to_vio_dev(dev));
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}
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static ssize_t
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show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct vio_dev *vdev;
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struct device_node *dp;
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vdev = to_vio_dev(dev);
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dp = vdev->dp;
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return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
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}
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static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
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show_pciobppath_attr, NULL);
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struct device_node *cdev_node;
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static struct vio_dev *root_vdev;
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static u64 cdev_cfg_handle;
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static struct vio_dev *vio_create_one(struct mdesc_node *mp,
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struct device *parent)
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{
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const char *type, *compat;
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struct device_node *dp;
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struct vio_dev *vdev;
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const u64 *irq;
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int err, clen;
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type = md_get_property(mp, "device-type", NULL);
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if (!type)
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type = md_get_property(mp, "name", NULL);
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compat = md_get_property(mp, "device-type", &clen);
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vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
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if (!vdev) {
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printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
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return NULL;
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}
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vdev->mp = mp;
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vdev->type = type;
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vdev->compat = compat;
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vdev->compat_len = clen;
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irq = md_get_property(mp, "tx-ino", NULL);
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if (irq)
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mp->irqs[0] = sun4v_build_virq(cdev_cfg_handle, *irq);
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irq = md_get_property(mp, "rx-ino", NULL);
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if (irq)
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mp->irqs[1] = sun4v_build_virq(cdev_cfg_handle, *irq);
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snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%lx", mp->node);
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vdev->dev.parent = parent;
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vdev->dev.bus = &vio_bus_type;
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vdev->dev.release = vio_dev_release;
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if (parent == NULL) {
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dp = cdev_node;
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} else if (to_vio_dev(parent) == root_vdev) {
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dp = of_get_next_child(cdev_node, NULL);
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while (dp) {
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if (!strcmp(dp->type, type))
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break;
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dp = of_get_next_child(cdev_node, dp);
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}
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} else {
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dp = to_vio_dev(parent)->dp;
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}
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vdev->dp = dp;
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err = device_register(&vdev->dev);
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if (err) {
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printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
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vdev->dev.bus_id, err);
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kfree(vdev);
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return NULL;
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}
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if (vdev->dp)
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err = sysfs_create_file(&vdev->dev.kobj,
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&dev_attr_obppath.attr);
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return vdev;
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}
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static void walk_tree(struct mdesc_node *n, struct vio_dev *parent)
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{
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int i;
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for (i = 0; i < n->num_arcs; i++) {
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struct mdesc_node *mp;
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struct vio_dev *vdev;
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if (strcmp(n->arcs[i].name, "fwd"))
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continue;
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mp = n->arcs[i].arc;
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vdev = vio_create_one(mp, &parent->dev);
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if (vdev && mp->num_arcs)
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walk_tree(mp, vdev);
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}
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}
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static void create_devices(struct mdesc_node *root)
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{
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root_vdev = vio_create_one(root, NULL);
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if (!root_vdev) {
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printk(KERN_ERR "VIO: Coult not create root device.\n");
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return;
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}
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walk_tree(root, root_vdev);
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}
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const char *channel_devices_node = "channel-devices";
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const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
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const char *cfg_handle_prop = "cfg-handle";
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static int __init vio_init(void)
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{
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struct mdesc_node *root;
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const char *compat;
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const u64 *cfg_handle;
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int err, len;
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root = md_find_node_by_name(NULL, channel_devices_node);
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if (!root) {
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printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
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return 0;
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}
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cdev_node = of_find_node_by_name(NULL, "channel-devices");
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if (!cdev_node) {
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printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
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return -ENODEV;
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}
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compat = md_get_property(root, "compatible", &len);
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if (!compat) {
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printk(KERN_ERR "VIO: Channel devices lacks compatible "
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"property\n");
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return -ENODEV;
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}
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if (!find_in_proplist(compat, channel_devices_compat, len)) {
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printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
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"compat entry.\n", channel_devices_compat);
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return -ENODEV;
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}
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cfg_handle = md_get_property(root, cfg_handle_prop, NULL);
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if (!cfg_handle) {
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printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
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cfg_handle_prop);
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return -ENODEV;
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}
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cdev_cfg_handle = *cfg_handle;
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err = bus_register(&vio_bus_type);
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if (err) {
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printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
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err);
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return err;
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}
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create_devices(root);
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return 0;
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}
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postcore_initcall(vio_init);
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