1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * CompactPCI Hot Plug Driver PCI functions
4 *
5 * Copyright (C) 2002,2005 by SOMA Networks, Inc.
6 *
7 * All rights reserved.
8 *
9 * Send feedback to <scottm@somanetworks.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
15 #include <linux/pci_hotplug.h>
16 #include <linux/proc_fs.h>
17 #include "../pci.h"
18 #include "cpci_hotplug.h"
19
20 #define MY_NAME "cpci_hotplug"
21
22 #define dbg(format, arg...) \
23 do { \
24 if (cpci_debug) \
25 printk(KERN_DEBUG "%s: " format "\n", \
26 MY_NAME, ## arg); \
27 } while (0)
28 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
29 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
30 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)
31
32
cpci_get_attention_status(struct slot * slot)33 u8 cpci_get_attention_status(struct slot *slot)
34 {
35 int hs_cap;
36 u16 hs_csr;
37
38 hs_cap = pci_bus_find_capability(slot->bus,
39 slot->devfn,
40 PCI_CAP_ID_CHSWP);
41 if (!hs_cap)
42 return 0;
43
44 if (pci_bus_read_config_word(slot->bus,
45 slot->devfn,
46 hs_cap + 2,
47 &hs_csr))
48 return 0;
49
50 return hs_csr & 0x0008 ? 1 : 0;
51 }
52
cpci_set_attention_status(struct slot * slot,int status)53 int cpci_set_attention_status(struct slot *slot, int status)
54 {
55 int hs_cap;
56 u16 hs_csr;
57
58 hs_cap = pci_bus_find_capability(slot->bus,
59 slot->devfn,
60 PCI_CAP_ID_CHSWP);
61 if (!hs_cap)
62 return 0;
63 if (pci_bus_read_config_word(slot->bus,
64 slot->devfn,
65 hs_cap + 2,
66 &hs_csr))
67 return 0;
68 if (status)
69 hs_csr |= HS_CSR_LOO;
70 else
71 hs_csr &= ~HS_CSR_LOO;
72 if (pci_bus_write_config_word(slot->bus,
73 slot->devfn,
74 hs_cap + 2,
75 hs_csr))
76 return 0;
77 return 1;
78 }
79
cpci_get_hs_csr(struct slot * slot)80 u16 cpci_get_hs_csr(struct slot *slot)
81 {
82 int hs_cap;
83 u16 hs_csr;
84
85 hs_cap = pci_bus_find_capability(slot->bus,
86 slot->devfn,
87 PCI_CAP_ID_CHSWP);
88 if (!hs_cap)
89 return 0xFFFF;
90 if (pci_bus_read_config_word(slot->bus,
91 slot->devfn,
92 hs_cap + 2,
93 &hs_csr))
94 return 0xFFFF;
95 return hs_csr;
96 }
97
cpci_check_and_clear_ins(struct slot * slot)98 int cpci_check_and_clear_ins(struct slot *slot)
99 {
100 int hs_cap;
101 u16 hs_csr;
102 int ins = 0;
103
104 hs_cap = pci_bus_find_capability(slot->bus,
105 slot->devfn,
106 PCI_CAP_ID_CHSWP);
107 if (!hs_cap)
108 return 0;
109 if (pci_bus_read_config_word(slot->bus,
110 slot->devfn,
111 hs_cap + 2,
112 &hs_csr))
113 return 0;
114 if (hs_csr & HS_CSR_INS) {
115 /* Clear INS (by setting it) */
116 if (pci_bus_write_config_word(slot->bus,
117 slot->devfn,
118 hs_cap + 2,
119 hs_csr))
120 ins = 0;
121 else
122 ins = 1;
123 }
124 return ins;
125 }
126
cpci_check_ext(struct slot * slot)127 int cpci_check_ext(struct slot *slot)
128 {
129 int hs_cap;
130 u16 hs_csr;
131 int ext = 0;
132
133 hs_cap = pci_bus_find_capability(slot->bus,
134 slot->devfn,
135 PCI_CAP_ID_CHSWP);
136 if (!hs_cap)
137 return 0;
138 if (pci_bus_read_config_word(slot->bus,
139 slot->devfn,
140 hs_cap + 2,
141 &hs_csr))
142 return 0;
143 if (hs_csr & HS_CSR_EXT)
144 ext = 1;
145 return ext;
146 }
147
cpci_clear_ext(struct slot * slot)148 int cpci_clear_ext(struct slot *slot)
149 {
150 int hs_cap;
151 u16 hs_csr;
152
153 hs_cap = pci_bus_find_capability(slot->bus,
154 slot->devfn,
155 PCI_CAP_ID_CHSWP);
156 if (!hs_cap)
157 return -ENODEV;
158 if (pci_bus_read_config_word(slot->bus,
159 slot->devfn,
160 hs_cap + 2,
161 &hs_csr))
162 return -ENODEV;
163 if (hs_csr & HS_CSR_EXT) {
164 /* Clear EXT (by setting it) */
165 if (pci_bus_write_config_word(slot->bus,
166 slot->devfn,
167 hs_cap + 2,
168 hs_csr))
169 return -ENODEV;
170 }
171 return 0;
172 }
173
cpci_led_on(struct slot * slot)174 int cpci_led_on(struct slot *slot)
175 {
176 int hs_cap;
177 u16 hs_csr;
178
179 hs_cap = pci_bus_find_capability(slot->bus,
180 slot->devfn,
181 PCI_CAP_ID_CHSWP);
182 if (!hs_cap)
183 return -ENODEV;
184 if (pci_bus_read_config_word(slot->bus,
185 slot->devfn,
186 hs_cap + 2,
187 &hs_csr))
188 return -ENODEV;
189 if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
190 hs_csr |= HS_CSR_LOO;
191 if (pci_bus_write_config_word(slot->bus,
192 slot->devfn,
193 hs_cap + 2,
194 hs_csr)) {
195 err("Could not set LOO for slot %s", slot_name(slot));
196 return -ENODEV;
197 }
198 }
199 return 0;
200 }
201
cpci_led_off(struct slot * slot)202 int cpci_led_off(struct slot *slot)
203 {
204 int hs_cap;
205 u16 hs_csr;
206
207 hs_cap = pci_bus_find_capability(slot->bus,
208 slot->devfn,
209 PCI_CAP_ID_CHSWP);
210 if (!hs_cap)
211 return -ENODEV;
212 if (pci_bus_read_config_word(slot->bus,
213 slot->devfn,
214 hs_cap + 2,
215 &hs_csr))
216 return -ENODEV;
217 if (hs_csr & HS_CSR_LOO) {
218 hs_csr &= ~HS_CSR_LOO;
219 if (pci_bus_write_config_word(slot->bus,
220 slot->devfn,
221 hs_cap + 2,
222 hs_csr)) {
223 err("Could not clear LOO for slot %s", slot_name(slot));
224 return -ENODEV;
225 }
226 }
227 return 0;
228 }
229
230
231 /*
232 * Device configuration functions
233 */
234
cpci_configure_slot(struct slot * slot)235 int cpci_configure_slot(struct slot *slot)
236 {
237 struct pci_dev *dev;
238 struct pci_bus *parent;
239 int ret = 0;
240
241 dbg("%s - enter", __func__);
242
243 pci_lock_rescan_remove();
244
245 if (slot->dev == NULL) {
246 dbg("pci_dev null, finding %02x:%02x:%x",
247 slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
248 slot->dev = pci_get_slot(slot->bus, slot->devfn);
249 }
250
251 /* Still NULL? Well then scan for it! */
252 if (slot->dev == NULL) {
253 int n;
254 dbg("pci_dev still null");
255
256 /*
257 * This will generate pci_dev structures for all functions, but
258 * we will only call this case when lookup fails.
259 */
260 n = pci_scan_slot(slot->bus, slot->devfn);
261 dbg("%s: pci_scan_slot returned %d", __func__, n);
262 slot->dev = pci_get_slot(slot->bus, slot->devfn);
263 if (slot->dev == NULL) {
264 err("Could not find PCI device for slot %02x", slot->number);
265 ret = -ENODEV;
266 goto out;
267 }
268 }
269 parent = slot->dev->bus;
270
271 for_each_pci_bridge(dev, parent) {
272 if (PCI_SLOT(dev->devfn) == PCI_SLOT(slot->devfn))
273 pci_hp_add_bridge(dev);
274 }
275
276 pci_assign_unassigned_bridge_resources(parent->self);
277
278 pci_bus_add_devices(parent);
279
280 out:
281 pci_unlock_rescan_remove();
282 dbg("%s - exit", __func__);
283 return ret;
284 }
285
cpci_unconfigure_slot(struct slot * slot)286 int cpci_unconfigure_slot(struct slot *slot)
287 {
288 struct pci_dev *dev, *temp;
289
290 dbg("%s - enter", __func__);
291 if (!slot->dev) {
292 err("No device for slot %02x\n", slot->number);
293 return -ENODEV;
294 }
295
296 pci_lock_rescan_remove();
297
298 list_for_each_entry_safe(dev, temp, &slot->bus->devices, bus_list) {
299 if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
300 continue;
301 pci_dev_get(dev);
302 pci_stop_and_remove_bus_device(dev);
303 pci_dev_put(dev);
304 }
305 pci_dev_put(slot->dev);
306 slot->dev = NULL;
307
308 pci_unlock_rescan_remove();
309
310 dbg("%s - exit", __func__);
311 return 0;
312 }
313