diff options
Diffstat (limited to 'arch/powerpc/kernel/vio.c')
-rw-r--r-- | arch/powerpc/kernel/vio.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c new file mode 100644 index 000000000000..97082a4203ad --- /dev/null +++ b/arch/powerpc/kernel/vio.c @@ -0,0 +1,271 @@ +/* + * IBM PowerPC 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/console.h> +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/dma-mapping.h> +#include <asm/iommu.h> +#include <asm/dma.h> +#include <asm/vio.h> + +static const struct vio_device_id *vio_match_device( + const struct vio_device_id *, const struct vio_dev *); + +struct vio_dev vio_bus_device = { /* fake "parent" device */ + .name = vio_bus_device.dev.bus_id, + .type = "", + .dev.bus_id = "vio", + .dev.bus = &vio_bus_type, +}; + +static struct vio_bus_ops vio_bus_ops; + +/* + * Convert from struct device to struct vio_dev and pass to driver. + * dev->driver has already been set by generic code because vio_bus_match + * succeeded. + */ +static int vio_bus_probe(struct device *dev) +{ + struct vio_dev *viodev = to_vio_dev(dev); + struct vio_driver *viodrv = to_vio_driver(dev->driver); + const struct vio_device_id *id; + int error = -ENODEV; + + if (!viodrv->probe) + return error; + + id = vio_match_device(viodrv->id_table, viodev); + if (id) + error = viodrv->probe(viodev, id); + + return error; +} + +/* convert from struct device to struct vio_dev and pass to driver. */ +static int vio_bus_remove(struct device *dev) +{ + struct vio_dev *viodev = to_vio_dev(dev); + struct vio_driver *viodrv = to_vio_driver(dev->driver); + + if (viodrv->remove) + return viodrv->remove(viodev); + + /* driver can't remove */ + return 1; +} + +/* convert from struct device to struct vio_dev and pass to driver. */ +static void vio_bus_shutdown(struct device *dev) +{ + struct vio_dev *viodev = to_vio_dev(dev); + struct vio_driver *viodrv = to_vio_driver(dev->driver); + + if (viodrv->shutdown) + viodrv->shutdown(viodev); +} + +/** + * vio_register_driver: - Register a new vio driver + * @drv: The vio_driver structure to be registered. + */ +int vio_register_driver(struct vio_driver *viodrv) +{ + printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__, + viodrv->driver.name); + + /* fill in 'struct driver' fields */ + viodrv->driver.bus = &vio_bus_type; + viodrv->driver.probe = vio_bus_probe; + viodrv->driver.remove = vio_bus_remove; + viodrv->driver.shutdown = vio_bus_shutdown; + + return driver_register(&viodrv->driver); +} +EXPORT_SYMBOL(vio_register_driver); + +/** + * vio_unregister_driver - Remove registration of vio driver. + * @driver: The vio_driver struct to be removed form registration + */ +void vio_unregister_driver(struct vio_driver *viodrv) +{ + driver_unregister(&viodrv->driver); +} +EXPORT_SYMBOL(vio_unregister_driver); + +/** + * vio_match_device: - Tell if a VIO device has a matching + * VIO device id structure. + * @ids: array of VIO device id structures to search in + * @dev: the VIO device structure to match against + * + * Used by a driver to check whether a VIO device present in the + * system is in its list of supported devices. Returns the matching + * vio_device_id structure or NULL if there is no match. + */ +static const struct vio_device_id *vio_match_device( + const struct vio_device_id *ids, const struct vio_dev *dev) +{ + while (ids->type[0] != '\0') { + if (vio_bus_ops.match(ids, dev)) + return ids; + ids++; + } + return NULL; +} + +/** + * vio_bus_init: - Initialize the virtual IO bus + */ +int __init vio_bus_init(struct vio_bus_ops *ops) +{ + int err; + + vio_bus_ops = *ops; + + err = bus_register(&vio_bus_type); + if (err) { + printk(KERN_ERR "failed to register VIO bus\n"); + return err; + } + + /* + * The fake parent of all vio devices, just to give us + * a nice directory + */ + err = device_register(&vio_bus_device.dev); + if (err) { + printk(KERN_WARNING "%s: device_register returned %i\n", + __FUNCTION__, err); + return err; + } + + return 0; +} + +/* vio_dev refcount hit 0 */ +static void __devinit vio_dev_release(struct device *dev) +{ + if (vio_bus_ops.release_device) + vio_bus_ops.release_device(dev); + kfree(to_vio_dev(dev)); +} + +static ssize_t viodev_show_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", to_vio_dev(dev)->name); +} +DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL); + +struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev) +{ + /* init generic 'struct device' fields: */ + viodev->dev.parent = &vio_bus_device.dev; + viodev->dev.bus = &vio_bus_type; + viodev->dev.release = vio_dev_release; + + /* register with generic device framework */ + if (device_register(&viodev->dev)) { + printk(KERN_ERR "%s: failed to register device %s\n", + __FUNCTION__, viodev->dev.bus_id); + return NULL; + } + device_create_file(&viodev->dev, &dev_attr_name); + + return viodev; +} + +void __devinit vio_unregister_device(struct vio_dev *viodev) +{ + if (vio_bus_ops.unregister_device) + vio_bus_ops.unregister_device(viodev); + device_remove_file(&viodev->dev, &dev_attr_name); + device_unregister(&viodev->dev); +} +EXPORT_SYMBOL(vio_unregister_device); + +static dma_addr_t vio_map_single(struct device *dev, void *vaddr, + size_t size, enum dma_data_direction direction) +{ + return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size, + direction); +} + +static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction direction) +{ + iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size, + direction); +} + +static int vio_map_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction) +{ + return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist, + nelems, direction); +} + +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, + dma_addr_t *dma_handle, gfp_t flag) +{ + return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size, + dma_handle, flag); +} + +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; + + return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL); +} + +struct bus_type vio_bus_type = { + .name = "vio", + .match = vio_bus_match, +}; |