1 /*
2 * CompactPCI Hot Plug Driver PCI functions
3 *
4 * Copyright (C) 2002,2005 by SOMA Networks, Inc.
5 *
6 * All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
16 * NON INFRINGEMENT. See the GNU General Public License for more
17 * details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * Send feedback to <scottm@somanetworks.com>
24 */
25
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/pci.h>
29 #include <linux/pci_hotplug.h>
30 #include <linux/proc_fs.h>
31 #include "../pci.h"
32 #include "cpci_hotplug.h"
33
34 #define MY_NAME "cpci_hotplug"
35
36 extern int cpci_debug;
37
38 #define dbg(format, arg...) \
39 do { \
40 if (cpci_debug) \
41 printk (KERN_DEBUG "%s: " format "\n", \
42 MY_NAME , ## arg); \
43 } while (0)
44 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
45 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
46 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
47
48
49 u8 cpci_get_attention_status(struct slot* slot)
50 {
51 int hs_cap;
52 u16 hs_csr;
53
54 hs_cap = pci_bus_find_capability(slot->bus,
55 slot->devfn,
56 PCI_CAP_ID_CHSWP);
57 if (!hs_cap)
58 return 0;
59
60 if (pci_bus_read_config_word(slot->bus,
61 slot->devfn,
62 hs_cap + 2,
63 &hs_csr))
64 return 0;
65
66 return hs_csr & 0x0008 ? 1 : 0;
67 }
68
69 int cpci_set_attention_status(struct slot* slot, int status)
70 {
71 int hs_cap;
72 u16 hs_csr;
73
74 hs_cap = pci_bus_find_capability(slot->bus,
75 slot->devfn,
76 PCI_CAP_ID_CHSWP);
77 if (!hs_cap)
78 return 0;
79 if (pci_bus_read_config_word(slot->bus,
80 slot->devfn,
81 hs_cap + 2,
82 &hs_csr))
83 return 0;
84 if (status)
85 hs_csr |= HS_CSR_LOO;
86 else
87 hs_csr &= ~HS_CSR_LOO;
88 if (pci_bus_write_config_word(slot->bus,
89 slot->devfn,
90 hs_cap + 2,
91 hs_csr))
92 return 0;
93 return 1;
94 }
95
96 u16 cpci_get_hs_csr(struct slot* slot)
97 {
98 int hs_cap;
99 u16 hs_csr;
100
101 hs_cap = pci_bus_find_capability(slot->bus,
102 slot->devfn,
103 PCI_CAP_ID_CHSWP);
104 if (!hs_cap)
105 return 0xFFFF;
106 if (pci_bus_read_config_word(slot->bus,
107 slot->devfn,
108 hs_cap + 2,
109 &hs_csr))
110 return 0xFFFF;
111 return hs_csr;
112 }
113
114 int cpci_check_and_clear_ins(struct slot* slot)
115 {
116 int hs_cap;
117 u16 hs_csr;
118 int ins = 0;
119
120 hs_cap = pci_bus_find_capability(slot->bus,
121 slot->devfn,
122 PCI_CAP_ID_CHSWP);
123 if (!hs_cap)
124 return 0;
125 if (pci_bus_read_config_word(slot->bus,
126 slot->devfn,
127 hs_cap + 2,
128 &hs_csr))
129 return 0;
130 if (hs_csr & HS_CSR_INS) {
131 /* Clear INS (by setting it) */
132 if (pci_bus_write_config_word(slot->bus,
133 slot->devfn,
134 hs_cap + 2,
135 hs_csr))
136 ins = 0;
137 else
138 ins = 1;
139 }
140 return ins;
141 }
142
143 int cpci_check_ext(struct slot* slot)
144 {
145 int hs_cap;
146 u16 hs_csr;
147 int ext = 0;
148
149 hs_cap = pci_bus_find_capability(slot->bus,
150 slot->devfn,
151 PCI_CAP_ID_CHSWP);
152 if (!hs_cap)
153 return 0;
154 if (pci_bus_read_config_word(slot->bus,
155 slot->devfn,
156 hs_cap + 2,
157 &hs_csr))
158 return 0;
159 if (hs_csr & HS_CSR_EXT)
160 ext = 1;
161 return ext;
162 }
163
164 int cpci_clear_ext(struct slot* slot)
165 {
166 int hs_cap;
167 u16 hs_csr;
168
169 hs_cap = pci_bus_find_capability(slot->bus,
170 slot->devfn,
171 PCI_CAP_ID_CHSWP);
172 if (!hs_cap)
173 return -ENODEV;
174 if (pci_bus_read_config_word(slot->bus,
175 slot->devfn,
176 hs_cap + 2,
177 &hs_csr))
178 return -ENODEV;
179 if (hs_csr & HS_CSR_EXT) {
180 /* Clear EXT (by setting it) */
181 if (pci_bus_write_config_word(slot->bus,
182 slot->devfn,
183 hs_cap + 2,
184 hs_csr))
185 return -ENODEV;
186 }
187 return 0;
188 }
189
190 int cpci_led_on(struct slot* slot)
191 {
192 int hs_cap;
193 u16 hs_csr;
194
195 hs_cap = pci_bus_find_capability(slot->bus,
196 slot->devfn,
197 PCI_CAP_ID_CHSWP);
198 if (!hs_cap)
199 return -ENODEV;
200 if (pci_bus_read_config_word(slot->bus,
201 slot->devfn,
202 hs_cap + 2,
203 &hs_csr))
204 return -ENODEV;
205 if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
206 hs_csr |= HS_CSR_LOO;
207 if (pci_bus_write_config_word(slot->bus,
208 slot->devfn,
209 hs_cap + 2,
210 hs_csr)) {
211 err("Could not set LOO for slot %s",
212 slot->hotplug_slot->name);
213 return -ENODEV;
214 }
215 }
216 return 0;
217 }
218
219 int cpci_led_off(struct slot* slot)
220 {
221 int hs_cap;
222 u16 hs_csr;
223
224 hs_cap = pci_bus_find_capability(slot->bus,
225 slot->devfn,
226 PCI_CAP_ID_CHSWP);
227 if (!hs_cap)
228 return -ENODEV;
229 if (pci_bus_read_config_word(slot->bus,
230 slot->devfn,
231 hs_cap + 2,
232 &hs_csr))
233 return -ENODEV;
234 if (hs_csr & HS_CSR_LOO) {
235 hs_csr &= ~HS_CSR_LOO;
236 if (pci_bus_write_config_word(slot->bus,
237 slot->devfn,
238 hs_cap + 2,
239 hs_csr)) {
240 err("Could not clear LOO for slot %s",
241 slot->hotplug_slot->name);
242 return -ENODEV;
243 }
244 }
245 return 0;
246 }
247
248
249 /*
250 * Device configuration functions
251 */
252
253 int __ref cpci_configure_slot(struct slot *slot)
254 {
255 struct pci_bus *parent;
256 int fn;
257
258 dbg("%s - enter", __FUNCTION__);
259
260 if (slot->dev == NULL) {
261 dbg("pci_dev null, finding %02x:%02x:%x",
262 slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
263 slot->dev = pci_get_slot(slot->bus, slot->devfn);
264 }
265
266 /* Still NULL? Well then scan for it! */
267 if (slot->dev == NULL) {
268 int n;
269 dbg("pci_dev still null");
270
271 /*
272 * This will generate pci_dev structures for all functions, but
273 * we will only call this case when lookup fails.
274 */
275 n = pci_scan_slot(slot->bus, slot->devfn);
276 dbg("%s: pci_scan_slot returned %d", __FUNCTION__, n);
277 slot->dev = pci_get_slot(slot->bus, slot->devfn);
278 if (slot->dev == NULL) {
279 err("Could not find PCI device for slot %02x", slot->number);
280 return -ENODEV;
281 }
282 }
283 parent = slot->dev->bus;
284
285 for (fn = 0; fn < 8; fn++) {
286 struct pci_dev *dev;
287
288 dev = pci_get_slot(parent, PCI_DEVFN(PCI_SLOT(slot->devfn), fn));
289 if (!dev)
290 continue;
291 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
292 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
293 /* Find an unused bus number for the new bridge */
294 struct pci_bus *child;
295 unsigned char busnr, start = parent->secondary;
296 unsigned char end = parent->subordinate;
297
298 for (busnr = start; busnr <= end; busnr++) {
299 if (!pci_find_bus(pci_domain_nr(parent),
300 busnr))
301 break;
302 }
303 if (busnr >= end) {
304 err("No free bus for hot-added bridge\n");
305 pci_dev_put(dev);
306 continue;
307 }
308 child = pci_add_new_bus(parent, dev, busnr);
309 if (!child) {
310 err("Cannot add new bus for %s\n",
311 pci_name(dev));
312 pci_dev_put(dev);
313 continue;
314 }
315 child->subordinate = pci_do_scan_bus(child);
316 pci_bus_size_bridges(child);
317 }
318 pci_dev_put(dev);
319 }
320
321 pci_bus_assign_resources(parent);
322 pci_bus_add_devices(parent);
323 pci_enable_bridges(parent);
324
325 dbg("%s - exit", __FUNCTION__);
326 return 0;
327 }
328
329 int cpci_unconfigure_slot(struct slot* slot)
330 {
331 int i;
332 struct pci_dev *dev;
333
334 dbg("%s - enter", __FUNCTION__);
335 if (!slot->dev) {
336 err("No device for slot %02x\n", slot->number);
337 return -ENODEV;
338 }
339
340 for (i = 0; i < 8; i++) {
341 dev = pci_get_slot(slot->bus,
342 PCI_DEVFN(PCI_SLOT(slot->devfn), i));
343 if (dev) {
344 pci_remove_bus_device(dev);
345 pci_dev_put(dev);
346 }
347 }
348 pci_dev_put(slot->dev);
349 slot->dev = NULL;
350
351 dbg("%s - exit", __FUNCTION__);
352 return 0;
353 }
354
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