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-rw-r--r--arch/ppc64/kernel/pSeries_vio.c273
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diff --git a/arch/ppc64/kernel/pSeries_vio.c b/arch/ppc64/kernel/pSeries_vio.c
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1/*
2 * IBM PowerPC pSeries Virtual I/O Infrastructure Support.
3 *
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>
8 * Stephen Rothwell
9 *
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.
14 */
15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/mm.h>
19#include <linux/kobject.h>
20#include <asm/iommu.h>
21#include <asm/dma.h>
22#include <asm/prom.h>
23#include <asm/vio.h>
24#include <asm/hvcall.h>
25
26extern struct subsystem devices_subsys; /* needed for vio_find_name() */
27
28static void probe_bus_pseries(void)
29{
30 struct device_node *node_vroot, *of_node;
31
32 node_vroot = find_devices("vdevice");
33 if ((node_vroot == NULL) || (node_vroot->child == NULL))
34 /* this machine doesn't do virtual IO, and that's ok */
35 return;
36
37 /*
38 * Create struct vio_devices for each virtual device in the device tree.
39 * Drivers will associate with them later.
40 */
41 for (of_node = node_vroot->child; of_node != NULL;
42 of_node = of_node->sibling) {
43 printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
44 vio_register_device_node(of_node);
45 }
46}
47
48/**
49 * vio_match_device_pseries: - Tell if a pSeries VIO device matches a
50 * vio_device_id
51 */
52static int vio_match_device_pseries(const struct vio_device_id *id,
53 const struct vio_dev *dev)
54{
55 return (strncmp(dev->type, id->type, strlen(id->type)) == 0) &&
56 device_is_compatible(dev->dev.platform_data, id->compat);
57}
58
59static void vio_release_device_pseries(struct device *dev)
60{
61 /* XXX free TCE table */
62 of_node_put(dev->platform_data);
63}
64
65static ssize_t viodev_show_devspec(struct device *dev,
66 struct device_attribute *attr, char *buf)
67{
68 struct device_node *of_node = dev->platform_data;
69
70 return sprintf(buf, "%s\n", of_node->full_name);
71}
72DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
73
74static void vio_unregister_device_pseries(struct vio_dev *viodev)
75{
76 device_remove_file(&viodev->dev, &dev_attr_devspec);
77}
78
79static struct vio_bus_ops vio_bus_ops_pseries = {
80 .match = vio_match_device_pseries,
81 .unregister_device = vio_unregister_device_pseries,
82 .release_device = vio_release_device_pseries,
83};
84
85/**
86 * vio_bus_init_pseries: - Initialize the pSeries virtual IO bus
87 */
88static int __init vio_bus_init_pseries(void)
89{
90 int err;
91
92 err = vio_bus_init(&vio_bus_ops_pseries);
93 if (err == 0)
94 probe_bus_pseries();
95 return err;
96}
97
98__initcall(vio_bus_init_pseries);
99
100/**
101 * vio_build_iommu_table: - gets the dma information from OF and
102 * builds the TCE tree.
103 * @dev: the virtual device.
104 *
105 * Returns a pointer to the built tce tree, or NULL if it can't
106 * find property.
107*/
108static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
109{
110 unsigned int *dma_window;
111 struct iommu_table *newTceTable;
112 unsigned long offset;
113 int dma_window_property_size;
114
115 dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
116 if(!dma_window) {
117 return NULL;
118 }
119
120 newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
121
122 /* There should be some code to extract the phys-encoded offset
123 using prom_n_addr_cells(). However, according to a comment
124 on earlier versions, it's always zero, so we don't bother */
125 offset = dma_window[1] >> PAGE_SHIFT;
126
127 /* TCE table size - measured in tce entries */
128 newTceTable->it_size = dma_window[4] >> PAGE_SHIFT;
129 /* offset for VIO should always be 0 */
130 newTceTable->it_offset = offset;
131 newTceTable->it_busno = 0;
132 newTceTable->it_index = (unsigned long)dma_window[0];
133 newTceTable->it_type = TCE_VB;
134
135 return iommu_init_table(newTceTable);
136}
137
138/**
139 * vio_register_device_node: - Register a new vio device.
140 * @of_node: The OF node for this device.
141 *
142 * Creates and initializes a vio_dev structure from the data in
143 * of_node (dev.platform_data) and adds it to the list of virtual devices.
144 * Returns a pointer to the created vio_dev or NULL if node has
145 * NULL device_type or compatible fields.
146 */
147struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
148{
149 struct vio_dev *viodev;
150 unsigned int *unit_address;
151 unsigned int *irq_p;
152
153 /* we need the 'device_type' property, in order to match with drivers */
154 if ((NULL == of_node->type)) {
155 printk(KERN_WARNING
156 "%s: node %s missing 'device_type'\n", __FUNCTION__,
157 of_node->name ? of_node->name : "<unknown>");
158 return NULL;
159 }
160
161 unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
162 if (!unit_address) {
163 printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
164 of_node->name ? of_node->name : "<unknown>");
165 return NULL;
166 }
167
168 /* allocate a vio_dev for this node */
169 viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
170 if (!viodev) {
171 return NULL;
172 }
173 memset(viodev, 0, sizeof(struct vio_dev));
174
175 viodev->dev.platform_data = of_node_get(of_node);
176
177 viodev->irq = NO_IRQ;
178 irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
179 if (irq_p) {
180 int virq = virt_irq_create_mapping(*irq_p);
181 if (virq == NO_IRQ) {
182 printk(KERN_ERR "Unable to allocate interrupt "
183 "number for %s\n", of_node->full_name);
184 } else
185 viodev->irq = irq_offset_up(virq);
186 }
187
188 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
189 viodev->name = of_node->name;
190 viodev->type = of_node->type;
191 viodev->unit_address = *unit_address;
192 viodev->iommu_table = vio_build_iommu_table(viodev);
193
194 /* register with generic device framework */
195 if (vio_register_device(viodev) == NULL) {
196 /* XXX free TCE table */
197 kfree(viodev);
198 return NULL;
199 }
200 device_create_file(&viodev->dev, &dev_attr_devspec);
201
202 return viodev;
203}
204EXPORT_SYMBOL(vio_register_device_node);
205
206/**
207 * vio_get_attribute: - get attribute for virtual device
208 * @vdev: The vio device to get property.
209 * @which: The property/attribute to be extracted.
210 * @length: Pointer to length of returned data size (unused if NULL).
211 *
212 * Calls prom.c's get_property() to return the value of the
213 * attribute specified by the preprocessor constant @which
214*/
215const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
216{
217 return get_property(vdev->dev.platform_data, (char*)which, length);
218}
219EXPORT_SYMBOL(vio_get_attribute);
220
221/* vio_find_name() - internal because only vio.c knows how we formatted the
222 * kobject name
223 * XXX once vio_bus_type.devices is actually used as a kset in
224 * drivers/base/bus.c, this function should be removed in favor of
225 * "device_find(kobj_name, &vio_bus_type)"
226 */
227static struct vio_dev *vio_find_name(const char *kobj_name)
228{
229 struct kobject *found;
230
231 found = kset_find_obj(&devices_subsys.kset, kobj_name);
232 if (!found)
233 return NULL;
234
235 return to_vio_dev(container_of(found, struct device, kobj));
236}
237
238/**
239 * vio_find_node - find an already-registered vio_dev
240 * @vnode: device_node of the virtual device we're looking for
241 */
242struct vio_dev *vio_find_node(struct device_node *vnode)
243{
244 uint32_t *unit_address;
245 char kobj_name[BUS_ID_SIZE];
246
247 /* construct the kobject name from the device node */
248 unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
249 if (!unit_address)
250 return NULL;
251 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
252
253 return vio_find_name(kobj_name);
254}
255EXPORT_SYMBOL(vio_find_node);
256
257int vio_enable_interrupts(struct vio_dev *dev)
258{
259 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
260 if (rc != H_Success)
261 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
262 return rc;
263}
264EXPORT_SYMBOL(vio_enable_interrupts);
265
266int vio_disable_interrupts(struct vio_dev *dev)
267{
268 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
269 if (rc != H_Success)
270 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
271 return rc;
272}
273EXPORT_SYMBOL(vio_disable_interrupts);