2 * IBM PowerPC pSeries Virtual I/O Infrastructure Support.
4 * Copyright (c) 2003-2005 IBM Corp.
5 * Dave Engebretsen engebret@us.ibm.com
6 * Santiago Leon santil@us.ibm.com
7 * Hollis Blanchard <hollisb@us.ibm.com>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/init.h>
17 #include <linux/module.h>
19 #include <linux/kobject.h>
20 #include <asm/iommu.h>
24 #include <asm/hvcall.h>
27 extern struct subsystem devices_subsys; /* needed for vio_find_name() */
30 * vio_build_iommu_table: - gets the dma information from OF and
31 * builds the TCE tree.
32 * @dev: the virtual device.
34 * Returns a pointer to the built tce tree, or NULL if it can't
37 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
39 unsigned int *dma_window;
40 struct iommu_table *newTceTable;
42 int dma_window_property_size;
44 dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
49 newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
51 /* There should be some code to extract the phys-encoded offset
52 using prom_n_addr_cells(). However, according to a comment
53 on earlier versions, it's always zero, so we don't bother */
54 offset = dma_window[1] >> PAGE_SHIFT;
56 /* TCE table size - measured in tce entries */
57 newTceTable->it_size = dma_window[4] >> PAGE_SHIFT;
58 /* offset for VIO should always be 0 */
59 newTceTable->it_offset = offset;
60 newTceTable->it_busno = 0;
61 newTceTable->it_index = (unsigned long)dma_window[0];
62 newTceTable->it_type = TCE_VB;
64 return iommu_init_table(newTceTable);
67 static struct vio_bus_ops vio_bus_ops_pseries = {
68 .build_iommu_table = vio_build_iommu_table,
72 * vio_bus_init_pseries: - Initialize the pSeries virtual IO bus
74 static int __init vio_bus_init_pseries(void)
76 return vio_bus_init(&vio_bus_ops_pseries);
79 __initcall(vio_bus_init_pseries);
81 /* vio_find_name() - internal because only vio.c knows how we formatted the
83 * XXX once vio_bus_type.devices is actually used as a kset in
84 * drivers/base/bus.c, this function should be removed in favor of
85 * "device_find(kobj_name, &vio_bus_type)"
87 static struct vio_dev *vio_find_name(const char *kobj_name)
89 struct kobject *found;
91 found = kset_find_obj(&devices_subsys.kset, kobj_name);
95 return to_vio_dev(container_of(found, struct device, kobj));
99 * vio_find_node - find an already-registered vio_dev
100 * @vnode: device_node of the virtual device we're looking for
102 struct vio_dev *vio_find_node(struct device_node *vnode)
104 uint32_t *unit_address;
105 char kobj_name[BUS_ID_SIZE];
107 /* construct the kobject name from the device node */
108 unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
111 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
113 return vio_find_name(kobj_name);
115 EXPORT_SYMBOL(vio_find_node);
117 int vio_enable_interrupts(struct vio_dev *dev)
119 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
121 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
124 EXPORT_SYMBOL(vio_enable_interrupts);
126 int vio_disable_interrupts(struct vio_dev *dev)
128 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
130 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
133 EXPORT_SYMBOL(vio_disable_interrupts);