2005-04-17 06:20:36 +08:00
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/*
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* IBM PowerPC Virtual I/O Infrastructure Support.
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*
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2005-07-12 15:50:26 +08:00
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* Copyright (c) 2003-2005 IBM Corp.
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2005-04-17 06:20:36 +08:00
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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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2005-07-12 15:50:26 +08:00
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* Stephen Rothwell
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2005-04-17 06:20:36 +08:00
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/dma-mapping.h>
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#include <asm/iommu.h>
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#include <asm/dma.h>
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#include <asm/vio.h>
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2005-11-09 13:34:36 +08:00
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#include <asm/prom.h>
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2006-04-27 15:18:21 +08:00
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#include <asm/firmware.h>
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2005-04-17 06:20:36 +08:00
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2005-07-12 15:40:17 +08:00
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struct vio_dev vio_bus_device = { /* fake "parent" device */
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2005-06-22 08:15:54 +08:00
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.name = vio_bus_device.dev.bus_id,
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.type = "",
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.dev.bus_id = "vio",
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.dev.bus = &vio_bus_type,
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2005-04-17 06:20:36 +08:00
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};
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2005-06-22 08:15:54 +08:00
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2005-08-17 14:41:44 +08:00
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static struct vio_bus_ops vio_bus_ops;
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2005-04-17 06:20:36 +08:00
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2006-04-27 15:18:21 +08:00
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/**
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* vio_match_device: - Tell if a VIO device has a matching
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* VIO device id structure.
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* @ids: array of VIO device id structures to search in
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* @dev: the VIO device structure to match against
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*
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* Used by a driver to check whether a VIO device present in the
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* system is in its list of supported devices. Returns the matching
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* vio_device_id structure or NULL if there is no match.
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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 *ids, const struct vio_dev *dev)
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{
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while (ids->type[0] != '\0') {
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2006-04-27 15:21:46 +08:00
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if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
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device_is_compatible(dev->dev.platform_data, ids->compat))
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2006-04-27 15:18:21 +08:00
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return ids;
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ids++;
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}
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return NULL;
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}
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2005-08-17 14:37:35 +08:00
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/*
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* Convert from struct device to struct vio_dev and pass to driver.
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2005-04-17 06:20:36 +08:00
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* dev->driver has already been set by generic code because vio_bus_match
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2005-08-17 14:37:35 +08:00
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* succeeded.
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*/
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2005-04-17 06:20:36 +08:00
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static int vio_bus_probe(struct device *dev)
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{
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struct vio_dev *viodev = to_vio_dev(dev);
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struct vio_driver *viodrv = 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 (!viodrv->probe)
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return error;
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id = vio_match_device(viodrv->id_table, viodev);
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2005-08-17 14:37:35 +08:00
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if (id)
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2005-04-17 06:20:36 +08:00
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error = viodrv->probe(viodev, id);
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return error;
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}
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/* convert from struct device to struct vio_dev and pass to driver. */
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static int vio_bus_remove(struct device *dev)
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{
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struct vio_dev *viodev = to_vio_dev(dev);
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struct vio_driver *viodrv = to_vio_driver(dev->driver);
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2005-08-17 14:37:35 +08:00
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if (viodrv->remove)
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2005-04-17 06:20:36 +08:00
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return viodrv->remove(viodev);
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/* driver can't remove */
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return 1;
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}
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2005-10-24 15:40:23 +08:00
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/* convert from struct device to struct vio_dev and pass to driver. */
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static void vio_bus_shutdown(struct device *dev)
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{
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struct vio_dev *viodev = to_vio_dev(dev);
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struct vio_driver *viodrv = to_vio_driver(dev->driver);
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2006-01-05 22:36:47 +08:00
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if (dev->driver && viodrv->shutdown)
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2005-10-24 15:40:23 +08:00
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viodrv->shutdown(viodev);
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}
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2005-04-17 06:20:36 +08:00
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/**
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* vio_register_driver: - Register a new vio driver
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* @drv: The vio_driver structure to be registered.
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*/
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int vio_register_driver(struct vio_driver *viodrv)
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{
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printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
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2005-10-24 12:53:21 +08:00
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viodrv->driver.name);
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2005-04-17 06:20:36 +08:00
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/* fill in 'struct driver' fields */
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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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/**
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* vio_unregister_driver - Remove registration of vio driver.
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* @driver: The vio_driver struct to be removed form registration
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*/
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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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/**
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2006-04-27 15:18:21 +08:00
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* vio_register_device_node: - Register a new vio device.
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* @of_node: The OF node for this device.
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2005-04-17 06:20:36 +08:00
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*
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2006-04-27 15:18:21 +08:00
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* Creates and initializes a vio_dev structure from the data in
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* of_node (dev.platform_data) and adds it to the list of virtual devices.
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* Returns a pointer to the created vio_dev or NULL if node has
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* NULL device_type or compatible fields.
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2005-04-17 06:20:36 +08:00
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*/
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2006-04-27 15:18:21 +08:00
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struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
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2005-04-17 06:20:36 +08:00
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{
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2006-04-27 15:18:21 +08:00
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struct vio_dev *viodev;
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unsigned int *unit_address;
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unsigned int *irq_p;
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/* we need the 'device_type' property, in order to match with drivers */
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if (of_node->type == NULL) {
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printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
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__FUNCTION__,
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of_node->name ? of_node->name : "<unknown>");
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return NULL;
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2005-04-17 06:20:36 +08:00
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}
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2006-04-27 15:18:21 +08:00
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unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
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if (unit_address == NULL) {
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printk(KERN_WARNING "%s: node %s missing 'reg'\n",
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__FUNCTION__,
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of_node->name ? of_node->name : "<unknown>");
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return NULL;
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}
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/* allocate a vio_dev for this node */
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viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
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if (viodev == NULL)
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return NULL;
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viodev->dev.platform_data = of_node_get(of_node);
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viodev->irq = NO_IRQ;
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irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
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if (irq_p) {
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int virq = virt_irq_create_mapping(*irq_p);
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if (virq == NO_IRQ) {
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printk(KERN_ERR "Unable to allocate interrupt "
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"number for %s\n", of_node->full_name);
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} else
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viodev->irq = irq_offset_up(virq);
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}
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snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
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viodev->name = of_node->name;
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viodev->type = of_node->type;
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viodev->unit_address = *unit_address;
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if (firmware_has_feature(FW_FEATURE_ISERIES)) {
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unit_address = (unsigned int *)get_property(of_node,
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"linux,unit_address", NULL);
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if (unit_address != NULL)
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viodev->unit_address = *unit_address;
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}
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viodev->iommu_table = vio_bus_ops.build_iommu_table(viodev);
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/* register with generic device framework */
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if (vio_register_device(viodev) == NULL) {
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/* XXX free TCE table */
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kfree(viodev);
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return NULL;
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}
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return viodev;
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2005-04-17 06:20:36 +08:00
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}
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2006-04-27 15:18:21 +08:00
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EXPORT_SYMBOL(vio_register_device_node);
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2005-04-17 06:20:36 +08:00
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/**
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* vio_bus_init: - Initialize the virtual IO bus
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*/
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2005-08-17 14:41:44 +08:00
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int __init vio_bus_init(struct vio_bus_ops *ops)
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2005-04-17 06:20:36 +08:00
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{
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int err;
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2006-04-27 15:18:21 +08:00
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struct device_node *node_vroot;
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2005-04-17 06:20:36 +08:00
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2005-08-17 14:41:44 +08:00
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vio_bus_ops = *ops;
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2005-07-12 15:45:27 +08:00
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2005-04-17 06:20:36 +08:00
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err = bus_register(&vio_bus_type);
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if (err) {
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printk(KERN_ERR "failed to register VIO bus\n");
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return err;
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}
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2005-08-17 14:37:35 +08:00
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/*
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* The fake parent of all vio devices, just to give us
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2005-07-12 15:40:17 +08:00
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* a nice directory
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*/
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2005-06-22 08:15:54 +08:00
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err = device_register(&vio_bus_device.dev);
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2005-04-17 06:20:36 +08:00
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if (err) {
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2005-07-12 15:40:17 +08:00
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printk(KERN_WARNING "%s: device_register returned %i\n",
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__FUNCTION__, err);
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2005-04-17 06:20:36 +08:00
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return err;
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}
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2006-04-27 15:18:21 +08:00
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node_vroot = find_devices("vdevice");
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if (node_vroot) {
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struct device_node *of_node;
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/*
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* Create struct vio_devices for each virtual device in
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* the device tree. Drivers will associate with them later.
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*/
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for (of_node = node_vroot->child; of_node != NULL;
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of_node = of_node->sibling) {
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printk(KERN_DEBUG "%s: processing %p\n",
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__FUNCTION__, of_node);
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vio_register_device_node(of_node);
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}
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}
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2005-07-12 15:40:17 +08:00
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return 0;
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}
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2005-04-17 06:20:36 +08:00
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/* vio_dev refcount hit 0 */
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static void __devinit vio_dev_release(struct device *dev)
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{
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2006-04-27 15:18:21 +08:00
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if (dev->platform_data) {
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/* XXX free TCE table */
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of_node_put(dev->platform_data);
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}
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2005-04-17 06:20:36 +08:00
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kfree(to_vio_dev(dev));
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}
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2006-04-27 15:18:21 +08:00
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static ssize_t name_show(struct device *dev,
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2005-08-17 14:37:35 +08:00
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struct device_attribute *attr, char *buf)
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2005-04-17 06:20:36 +08:00
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{
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return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
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}
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2006-04-27 15:18:21 +08:00
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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 device_node *of_node = dev->platform_data;
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return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
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}
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static struct device_attribute vio_dev_attrs[] = {
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__ATTR_RO(name),
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__ATTR_RO(devspec),
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__ATTR_NULL
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};
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2005-04-17 06:20:36 +08:00
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2005-08-17 14:40:12 +08:00
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struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev)
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2005-04-17 06:20:36 +08:00
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{
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/* init generic 'struct device' fields: */
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2005-06-22 08:15:54 +08:00
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viodev->dev.parent = &vio_bus_device.dev;
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2005-04-17 06:20:36 +08:00
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viodev->dev.bus = &vio_bus_type;
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viodev->dev.release = vio_dev_release;
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/* register with generic device framework */
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if (device_register(&viodev->dev)) {
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printk(KERN_ERR "%s: failed to register device %s\n",
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__FUNCTION__, viodev->dev.bus_id);
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return NULL;
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}
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return viodev;
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}
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void __devinit vio_unregister_device(struct vio_dev *viodev)
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{
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device_unregister(&viodev->dev);
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}
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EXPORT_SYMBOL(vio_unregister_device);
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static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
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size_t size, enum dma_data_direction direction)
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{
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return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
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2006-04-13 10:05:59 +08:00
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~0ul, direction);
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2005-04-17 06:20:36 +08:00
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}
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static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction)
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{
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iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
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direction);
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}
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static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
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int nelems, enum dma_data_direction direction)
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{
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return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
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2006-04-13 10:05:59 +08:00
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|
|
nelems, ~0ul, direction);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|
|
|
int nelems, enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void *vio_alloc_coherent(struct device *dev, size_t size,
|
2005-10-07 14:46:04 +08:00
|
|
|
dma_addr_t *dma_handle, gfp_t flag)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
|
2006-04-13 10:05:59 +08:00
|
|
|
dma_handle, ~0ul, flag);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void vio_free_coherent(struct device *dev, size_t size,
|
|
|
|
void *vaddr, dma_addr_t dma_handle)
|
|
|
|
{
|
|
|
|
iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
|
|
|
|
dma_handle);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vio_dma_supported(struct device *dev, u64 mask)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct dma_mapping_ops vio_dma_ops = {
|
|
|
|
.alloc_coherent = vio_alloc_coherent,
|
|
|
|
.free_coherent = vio_free_coherent,
|
|
|
|
.map_single = vio_map_single,
|
|
|
|
.unmap_single = vio_unmap_single,
|
|
|
|
.map_sg = vio_map_sg,
|
|
|
|
.unmap_sg = vio_unmap_sg,
|
|
|
|
.dma_supported = vio_dma_supported,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int vio_bus_match(struct device *dev, struct device_driver *drv)
|
|
|
|
{
|
|
|
|
const struct vio_dev *vio_dev = to_vio_dev(dev);
|
|
|
|
struct vio_driver *vio_drv = to_vio_driver(drv);
|
|
|
|
const struct vio_device_id *ids = vio_drv->id_table;
|
|
|
|
|
2005-08-17 14:37:35 +08:00
|
|
|
return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-11-09 13:34:36 +08:00
|
|
|
static int vio_hotplug(struct device *dev, char **envp, int num_envp,
|
|
|
|
char *buffer, int buffer_size)
|
|
|
|
{
|
|
|
|
const struct vio_dev *vio_dev = to_vio_dev(dev);
|
2006-04-27 15:18:21 +08:00
|
|
|
struct device_node *dn = dev->platform_data;
|
2005-11-09 13:34:36 +08:00
|
|
|
char *cp;
|
|
|
|
int length;
|
|
|
|
|
|
|
|
if (!num_envp)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2006-04-27 15:18:21 +08:00
|
|
|
if (!dn)
|
2005-11-09 13:34:36 +08:00
|
|
|
return -ENODEV;
|
2006-04-27 15:18:21 +08:00
|
|
|
cp = (char *)get_property(dn, "compatible", &length);
|
2005-11-09 13:34:36 +08:00
|
|
|
if (!cp)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
envp[0] = buffer;
|
|
|
|
length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
|
|
|
|
vio_dev->type, cp);
|
2006-04-27 15:18:21 +08:00
|
|
|
if ((buffer_size - length) <= 0)
|
2005-11-09 13:34:36 +08:00
|
|
|
return -ENOMEM;
|
|
|
|
envp[1] = NULL;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
struct bus_type vio_bus_type = {
|
|
|
|
.name = "vio",
|
2006-04-27 15:18:21 +08:00
|
|
|
.dev_attrs = vio_dev_attrs,
|
2005-11-16 16:00:00 +08:00
|
|
|
.uevent = vio_hotplug,
|
2005-04-17 06:20:36 +08:00
|
|
|
.match = vio_bus_match,
|
2006-01-05 22:36:47 +08:00
|
|
|
.probe = vio_bus_probe,
|
|
|
|
.remove = vio_bus_remove,
|
|
|
|
.shutdown = vio_bus_shutdown,
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
2006-04-27 15:18:21 +08:00
|
|
|
|
|
|
|
/**
|
|
|
|
* 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 @which
|
|
|
|
*/
|
|
|
|
const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
|
|
|
|
{
|
|
|
|
return get_property(vdev->dev.platform_data, which, length);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(vio_get_attribute);
|