diff options
Diffstat (limited to 'arch/sparc64/kernel/vio.c')
-rw-r--r-- | arch/sparc64/kernel/vio.c | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/vio.c b/arch/sparc64/kernel/vio.c new file mode 100644 index 00000000000..21c015e8365 --- /dev/null +++ b/arch/sparc64/kernel/vio.c @@ -0,0 +1,347 @@ +/* vio.c: Virtual I/O channel devices probing infrastructure. + * + * 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 + * + * Adapted to sparc64 by David S. Miller davem@davemloft.net + */ + +#include <linux/kernel.h> +#include <linux/irq.h> +#include <linux/init.h> + +#include <asm/mdesc.h> +#include <asm/vio.h> + +static inline int find_in_proplist(const char *list, const char *match, + int len) +{ + while (len > 0) { + int l; + + if (!strcmp(list, match)) + return 1; + l = strlen(list) + 1; + list += l; + len -= l; + } + return 0; +} + +static const struct vio_device_id *vio_match_device( + const struct vio_device_id *matches, + const struct vio_dev *dev) +{ + const char *type, *compat; + int len; + + type = dev->type; + compat = dev->compat; + len = dev->compat_len; + + while (matches->type[0] || matches->compat[0]) { + int match = 1; + if (matches->type[0]) { + match &= type + && !strcmp(matches->type, type); + } + if (matches->compat[0]) { + match &= compat && + find_in_proplist(compat, matches->compat, len); + } + if (match) + return matches; + matches++; + } + return NULL; +} + +static int vio_bus_match(struct device *dev, struct device_driver *drv) +{ + struct vio_dev *vio_dev = to_vio_dev(dev); + struct vio_driver *vio_drv = to_vio_driver(drv); + const struct vio_device_id *matches = vio_drv->id_table; + + if (!matches) + return 0; + + return vio_match_device(matches, vio_dev) != NULL; +} + +static int vio_device_probe(struct device *dev) +{ + struct vio_dev *vdev = to_vio_dev(dev); + struct vio_driver *drv = to_vio_driver(dev->driver); + const struct vio_device_id *id; + int error = -ENODEV; + + if (drv->probe) { + id = vio_match_device(drv->id_table, vdev); + if (id) + error = drv->probe(vdev, id); + } + + return error; +} + +static int vio_device_remove(struct device *dev) +{ + struct vio_dev *vdev = to_vio_dev(dev); + struct vio_driver *drv = to_vio_driver(dev->driver); + + if (drv->remove) + return drv->remove(vdev); + + return 1; +} + +static ssize_t devspec_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct vio_dev *vdev = to_vio_dev(dev); + const char *str = "none"; + + if (vdev->type) { + if (!strcmp(vdev->type, "network")) + str = "vnet"; + else if (!strcmp(vdev->type, "block")) + str = "vdisk"; + } + + return sprintf(buf, "%s\n", str); +} + +static struct device_attribute vio_dev_attrs[] = { + __ATTR_RO(devspec), + __ATTR_NULL +}; + +static struct bus_type vio_bus_type = { + .name = "vio", + .dev_attrs = vio_dev_attrs, + .match = vio_bus_match, + .probe = vio_device_probe, + .remove = vio_device_remove, +}; + +int vio_register_driver(struct vio_driver *viodrv) +{ + viodrv->driver.bus = &vio_bus_type; + + return driver_register(&viodrv->driver); +} +EXPORT_SYMBOL(vio_register_driver); + +void vio_unregister_driver(struct vio_driver *viodrv) +{ + driver_unregister(&viodrv->driver); +} +EXPORT_SYMBOL(vio_unregister_driver); + +struct mdesc_node *vio_find_endpoint(struct vio_dev *vdev) +{ + struct mdesc_node *endp, *mp = vdev->mp; + int i; + + endp = NULL; + for (i = 0; i < mp->num_arcs; i++) { + struct mdesc_node *t; + + if (strcmp(mp->arcs[i].name, "fwd")) + continue; + + t = mp->arcs[i].arc; + if (strcmp(t->name, "channel-endpoint")) + continue; + + endp = t; + break; + } + + return endp; +} +EXPORT_SYMBOL(vio_find_endpoint); + +static void __devinit vio_dev_release(struct device *dev) +{ + kfree(to_vio_dev(dev)); +} + +static ssize_t +show_pciobppath_attr(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct vio_dev *vdev; + struct device_node *dp; + + vdev = to_vio_dev(dev); + dp = vdev->dp; + + return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); +} + +static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, + show_pciobppath_attr, NULL); + +struct device_node *cdev_node; + +static struct vio_dev *root_vdev; +static u64 cdev_cfg_handle; + +static struct vio_dev *vio_create_one(struct mdesc_node *mp, + struct device *parent) +{ + const char *type, *compat; + struct device_node *dp; + struct vio_dev *vdev; + const u64 *irq; + int err, clen; + + type = md_get_property(mp, "device-type", NULL); + if (!type) + type = md_get_property(mp, "name", NULL); + compat = md_get_property(mp, "device-type", &clen); + + vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); + if (!vdev) { + printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); + return NULL; + } + + vdev->mp = mp; + vdev->type = type; + vdev->compat = compat; + vdev->compat_len = clen; + + irq = md_get_property(mp, "tx-ino", NULL); + if (irq) + mp->irqs[0] = sun4v_build_virq(cdev_cfg_handle, *irq); + + irq = md_get_property(mp, "rx-ino", NULL); + if (irq) + mp->irqs[1] = sun4v_build_virq(cdev_cfg_handle, *irq); + + snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%lx", mp->node); + vdev->dev.parent = parent; + vdev->dev.bus = &vio_bus_type; + vdev->dev.release = vio_dev_release; + + if (parent == NULL) { + dp = cdev_node; + } else if (to_vio_dev(parent) == root_vdev) { + dp = of_get_next_child(cdev_node, NULL); + while (dp) { + if (!strcmp(dp->type, type)) + break; + + dp = of_get_next_child(cdev_node, dp); + } + } else { + dp = to_vio_dev(parent)->dp; + } + vdev->dp = dp; + + err = device_register(&vdev->dev); + if (err) { + printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", + vdev->dev.bus_id, err); + kfree(vdev); + return NULL; + } + if (vdev->dp) + err = sysfs_create_file(&vdev->dev.kobj, + &dev_attr_obppath.attr); + + return vdev; +} + +static void walk_tree(struct mdesc_node *n, struct vio_dev *parent) +{ + int i; + + for (i = 0; i < n->num_arcs; i++) { + struct mdesc_node *mp; + struct vio_dev *vdev; + + if (strcmp(n->arcs[i].name, "fwd")) + continue; + + mp = n->arcs[i].arc; + + vdev = vio_create_one(mp, &parent->dev); + if (vdev && mp->num_arcs) + walk_tree(mp, vdev); + } +} + +static void create_devices(struct mdesc_node *root) +{ + root_vdev = vio_create_one(root, NULL); + if (!root_vdev) { + printk(KERN_ERR "VIO: Coult not create root device.\n"); + return; + } + + walk_tree(root, root_vdev); +} + +const char *channel_devices_node = "channel-devices"; +const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; +const char *cfg_handle_prop = "cfg-handle"; + +static int __init vio_init(void) +{ + struct mdesc_node *root; + const char *compat; + const u64 *cfg_handle; + int err, len; + + root = md_find_node_by_name(NULL, channel_devices_node); + if (!root) { + printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); + return 0; + } + + cdev_node = of_find_node_by_name(NULL, "channel-devices"); + if (!cdev_node) { + printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); + return -ENODEV; + } + + compat = md_get_property(root, "compatible", &len); + if (!compat) { + printk(KERN_ERR "VIO: Channel devices lacks compatible " + "property\n"); + return -ENODEV; + } + if (!find_in_proplist(compat, channel_devices_compat, len)) { + printk(KERN_ERR "VIO: Channel devices node lacks (%s) " + "compat entry.\n", channel_devices_compat); + return -ENODEV; + } + + cfg_handle = md_get_property(root, cfg_handle_prop, NULL); + if (!cfg_handle) { + printk(KERN_ERR "VIO: Channel devices lacks %s property\n", + cfg_handle_prop); + return -ENODEV; + } + + cdev_cfg_handle = *cfg_handle; + + err = bus_register(&vio_bus_type); + if (err) { + printk(KERN_ERR "VIO: Could not register bus type err=%d\n", + err); + return err; + } + + create_devices(root); + + return 0; +} + +postcore_initcall(vio_init); |