common_bridge.c revision 1b2ce5a6 
1/*
2 * (C) Copyright IBM Corporation 2006
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * the Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
19 * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 */
24
25/**
26 * \file common_bridge.c
27 * Support routines used to process PCI header information for bridges.
28 *
29 * \author Ian Romanick <idr@us.ibm.com>
30 */
31
32#if defined(HAVE_CONFIG_H)
33#include "config.h"
34#endif
35
36#include <stdio.h>
37#include <stdlib.h>
38#include <ctype.h>
39#include <errno.h>
40
41#if defined(HAVE_STRING_H)
42# include <string.h>
43#elif defined(HAVE_STRINGS_H)
44# include <strings.h>
45#endif
46
47#if defined(HAVE_INTTYPES_H)
48# include <inttypes.h>
49#elif defined(HAVE_STDINT_H)
50# include <stdint.h>
51#endif
52
53#include "pciaccess.h"
54#include "pciaccess_private.h"
55
56static int
57read_bridge_info( struct pci_device_private * priv )
58{
59    uint8_t  buf[0x40];
60    pciaddr_t bytes;
61    int err;
62
63
64    /* Make sure the device has been probed.  If not, header_type won't be
65     * set and the rest of this function will fail.
66     */
67    err = pci_device_probe(& priv->base);
68    if (err) {
69	return err;
70    }
71
72    switch ( priv->header_type & 0x7f ) {
73    case 0x00:
74	break;
75
76    case 0x01: {
77	struct pci_bridge_info *info;
78
79	info = malloc(sizeof(*info));
80	if (info != NULL) {
81	    pci_device_cfg_read( (struct pci_device *) priv, buf + 0x18, 0x18,
82				 0x40 - 0x18, & bytes );
83
84	    info->primary_bus = buf[0x18];
85	    info->secondary_bus = buf[0x19];
86	    info->subordinate_bus = buf[0x1a];
87	    info->secondary_latency_timer = buf[0x1b];
88
89	    info->io_type = buf[0x1c] & 0x0f;
90	    info->io_base = (((uint32_t) (buf[0x1c] & 0x0f0)) << 8)
91	      + (((uint32_t) buf[0x30]) << 16)
92	      + (((uint32_t) buf[0x31]) << 24);
93
94	    info->io_limit = 0x00000fff
95	      + (((uint32_t) (buf[0x1d] & 0x0f0)) << 8)
96	      + (((uint32_t) buf[0x32]) << 16)
97	      + (((uint32_t) buf[0x33]) << 24);
98
99	    info->mem_type = buf[0x20] & 0x0f;
100	    info->mem_base = (((uint32_t) (buf[0x20] & 0x0f0)) << 16)
101	      + (((uint32_t) buf[0x21]) << 24);
102
103	    info->mem_limit = 0x0000ffff
104	      + (((uint32_t) (buf[0x22] & 0x0f0)) << 16)
105	      + (((uint32_t) buf[0x23]) << 24);
106
107	    info->prefetch_mem_type = buf[0x24] & 0x0f;
108	    info->prefetch_mem_base = (((uint64_t) (buf[0x24] & 0x0f0)) << 16)
109	      + (((uint64_t) buf[0x25]) << 24)
110	      + (((uint64_t) buf[0x28]) << 32)
111	      + (((uint64_t) buf[0x29]) << 40)
112	      + (((uint64_t) buf[0x2a]) << 48)
113	      + (((uint64_t) buf[0x2b]) << 56);
114
115	    info->prefetch_mem_limit = 0x0000ffff
116	      + (((uint64_t) (buf[0x26] & 0x0f0)) << 16)
117	      + (((uint64_t) buf[0x27]) << 24)
118	      + (((uint64_t) buf[0x2c]) << 32)
119	      + (((uint64_t) buf[0x2d]) << 40)
120	      + (((uint64_t) buf[0x2e]) << 48)
121	      + (((uint64_t) buf[0x2f]) << 56);
122
123	    info->bridge_control = ((uint16_t) buf[0x3e])
124	      + (((uint16_t) buf[0x3f]) << 8);
125
126	    info->secondary_status = ((uint16_t) buf[0x1e])
127	      + (((uint16_t) buf[0x1f]) << 8);
128	}
129
130	priv->bridge.pci = info;
131	break;
132    }
133
134    case 0x02: {
135	struct pci_pcmcia_bridge_info *info;
136
137	info = malloc(sizeof(*info));
138	if (info != NULL) {
139	    pci_device_cfg_read( (struct pci_device *) priv, buf + 0x16, 0x16,
140				 0x40 - 0x16, & bytes );
141
142	    info->primary_bus = buf[0x18];
143	    info->card_bus = buf[0x19];
144	    info->subordinate_bus = buf[0x1a];
145	    info->cardbus_latency_timer = buf[0x1b];
146
147	    info->mem[0].base = (((uint32_t) buf[0x1c]))
148	      + (((uint32_t) buf[0x1d]) << 8)
149	      + (((uint32_t) buf[0x1e]) << 16)
150	      + (((uint32_t) buf[0x1f]) << 24);
151
152	    info->mem[0].limit = (((uint32_t) buf[0x20]))
153	      + (((uint32_t) buf[0x21]) << 8)
154	      + (((uint32_t) buf[0x22]) << 16)
155	      + (((uint32_t) buf[0x23]) << 24);
156
157	    info->mem[1].base = (((uint32_t) buf[0x24]))
158	      + (((uint32_t) buf[0x25]) << 8)
159	      + (((uint32_t) buf[0x26]) << 16)
160	      + (((uint32_t) buf[0x27]) << 24);
161
162	    info->mem[1].limit = (((uint32_t) buf[0x28]))
163	      + (((uint32_t) buf[0x29]) << 8)
164	      + (((uint32_t) buf[0x2a]) << 16)
165	      + (((uint32_t) buf[0x2b]) << 24);
166
167	    info->io[0].base = (((uint32_t) buf[0x2c]))
168	      + (((uint32_t) buf[0x2d]) << 8)
169	      + (((uint32_t) buf[0x2e]) << 16)
170	      + (((uint32_t) buf[0x2f]) << 24);
171
172	    info->io[0].limit = (((uint32_t) buf[0x30]))
173	      + (((uint32_t) buf[0x31]) << 8)
174	      + (((uint32_t) buf[0x32]) << 16)
175	      + (((uint32_t) buf[0x33]) << 24);
176
177	    info->io[1].base = (((uint32_t) buf[0x34]))
178	      + (((uint32_t) buf[0x35]) << 8)
179	      + (((uint32_t) buf[0x36]) << 16)
180	      + (((uint32_t) buf[0x37]) << 24);
181
182	    info->io[1].limit = (((uint32_t) buf[0x38]))
183	      + (((uint32_t) buf[0x39]) << 8)
184	      + (((uint32_t) buf[0x3a]) << 16)
185	      + (((uint32_t) buf[0x3b]) << 24);
186
187	    info->secondary_status = ((uint16_t) buf[0x16])
188	      + (((uint16_t) buf[0x17]) << 8);
189
190	    info->bridge_control = ((uint16_t) buf[0x3e])
191	      + (((uint16_t) buf[0x3f]) << 8);
192	}
193
194	priv->bridge.pcmcia = info;
195	break;
196    }
197    }
198
199    return 0;
200}
201
202
203/**
204 * Get the PCI bridge information for a device
205 *
206 * \returns
207 * If \c dev is a PCI-to-PCI bridge, a pointer to a \c pci_bridge_info
208 * structure.  Otherwise, \c NULL is returned.
209 */
210const struct pci_bridge_info *
211pci_device_get_bridge_info( struct pci_device * dev )
212{
213    struct pci_device_private * priv = (struct pci_device_private *) dev;
214
215    if (priv->bridge.pci == NULL) {
216	read_bridge_info(priv);
217    }
218
219    return (priv->header_type == 1) ? priv->bridge.pci : NULL;
220}
221
222
223/**
224 * Get the PCMCIA bridge information for a device
225 *
226 * \returns
227 * If \c dev is a PCI-to-PCMCIA bridge, a pointer to a
228 * \c pci_pcmcia_bridge_info structure.  Otherwise, \c NULL is returned.
229 */
230const struct pci_pcmcia_bridge_info *
231pci_device_get_pcmcia_bridge_info( struct pci_device * dev )
232{
233    struct pci_device_private * priv = (struct pci_device_private *) dev;
234
235    if (priv->bridge.pcmcia == NULL) {
236	read_bridge_info(priv);
237    }
238
239    return (priv->header_type == 2) ? priv->bridge.pcmcia : NULL;
240}
241
242
243/**
244 * Determine the primary, secondary, and subordinate buses for a bridge
245 *
246 * Determines the IDs of the primary, secondary, and subordinate buses for
247 * a specified bridge.  Not all bridges directly store this information
248 * (e.g., PCI-to-ISA bridges).  For those bridges, no error is returned, but
249 * -1 is stored in the bus IDs that don't make sense.
250 *
251 * For example, for a PCI-to-ISA bridge, \c primary_bus will be set to the ID
252 * of the bus containing the device and both \c secondary_bus and
253 * \c subordinate_bus will be set to -1.
254 *
255 * \return
256 * On success, zero is returned.  If \c dev is not a bridge, \c ENODEV is
257 * returned.
258 *
259 * \bug
260 * Host bridges are handled the same way as PCI-to-ISA bridges.  This is
261 * almost certainly not correct.
262 */
263int
264pci_device_get_bridge_buses(struct pci_device * dev, int *primary_bus,
265			    int *secondary_bus, int *subordinate_bus)
266{
267    struct pci_device_private * priv = (struct pci_device_private *) dev;
268
269    /* If the device isn't a bridge, return an error.
270     */
271
272    if (((dev->device_class >> 16) & 0x0ff) != 0x06) {
273	return ENODEV;
274    }
275
276    if (!priv->bridge.pci) {
277	return ENODEV;
278    }
279
280    switch ((dev->device_class >> 8) & 0x0ff) {
281    case 0x00:
282	/* What to do for host bridges?  I'm pretty sure this isn't right.
283	 */
284	*primary_bus = dev->bus;
285	*secondary_bus = -1;
286	*subordinate_bus = -1;
287	break;
288
289    case 0x01:
290    case 0x02:
291    case 0x03:
292	*primary_bus = dev->bus;
293	*secondary_bus = -1;
294	*subordinate_bus = -1;
295	break;
296
297    case 0x04:
298    if (priv->bridge.pci == NULL)
299        read_bridge_info(priv);
300    if (priv->header_type == 0x01) {
301	*primary_bus = priv->bridge.pci->primary_bus;
302	*secondary_bus = priv->bridge.pci->secondary_bus;
303	*subordinate_bus = priv->bridge.pci->subordinate_bus;
304    } else {
305	*primary_bus = dev->bus;
306	*secondary_bus = -1;
307	*subordinate_bus = -1;
308    }
309	break;
310
311    case 0x07:
312    if (priv->bridge.pcmcia == NULL)
313        read_bridge_info(priv);
314    if (priv->header_type == 0x02) {
315	*primary_bus = priv->bridge.pcmcia->primary_bus;
316	*secondary_bus = priv->bridge.pcmcia->card_bus;
317	*subordinate_bus = priv->bridge.pcmcia->subordinate_bus;
318    } else {
319	*primary_bus = dev->bus;
320	*secondary_bus = -1;
321	*subordinate_bus = -1;
322    }
323	break;
324    }
325
326    return 0;
327}
328
329#define PCI_CLASS_BRIDGE 0x06
330#define PCI_SUBCLASS_BRIDGE_PCI 0x04
331
332struct pci_device *
333pci_device_get_parent_bridge(struct pci_device *dev)
334{
335    struct pci_id_match bridge_match = {
336        PCI_MATCH_ANY, PCI_MATCH_ANY, PCI_MATCH_ANY, PCI_MATCH_ANY,
337        (PCI_CLASS_BRIDGE << 16) | (PCI_SUBCLASS_BRIDGE_PCI << 8),
338        0
339    };
340
341    struct pci_device *bridge;
342    struct pci_device_iterator *iter;
343
344    if (dev == NULL)
345        return NULL;
346
347    iter = pci_id_match_iterator_create(& bridge_match);
348    if (iter == NULL)
349        return NULL;
350
351    while ((bridge = pci_device_next(iter)) != NULL) {
352        if (bridge->domain == dev->domain) {
353            const struct pci_bridge_info *info =
354                pci_device_get_bridge_info(bridge);
355
356            if (info != NULL) {
357                if (info->secondary_bus == dev->bus) {
358                    break;
359                }
360            }
361        }
362    }
363
364    pci_iterator_destroy(iter);
365
366    return bridge;
367}
368