1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * amd8131_edac.c, AMD8131 hypertransport chip EDAC kernel module
4 *
5 * Copyright (c) 2008 Wind River Systems, Inc.
6 *
7 * Authors: Cao Qingtao <qingtao.cao@windriver.com>
8 * Benjamin Walsh <benjamin.walsh@windriver.com>
9 * Hu Yongqi <yongqi.hu@windriver.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/bitops.h>
17 #include <linux/edac.h>
18 #include <linux/pci_ids.h>
19
20 #include "edac_module.h"
21 #include "amd8131_edac.h"
22
23 #define AMD8131_EDAC_REVISION " Ver: 1.0.0"
24 #define AMD8131_EDAC_MOD_STR "amd8131_edac"
25
26 /* Wrapper functions for accessing PCI configuration space */
edac_pci_read_dword(struct pci_dev * dev,int reg,u32 * val32)27 static void edac_pci_read_dword(struct pci_dev *dev, int reg, u32 *val32)
28 {
29 int ret;
30
31 ret = pci_read_config_dword(dev, reg, val32);
32 if (ret != 0)
33 printk(KERN_ERR AMD8131_EDAC_MOD_STR
34 " PCI Access Read Error at 0x%x\n", reg);
35 }
36
edac_pci_write_dword(struct pci_dev * dev,int reg,u32 val32)37 static void edac_pci_write_dword(struct pci_dev *dev, int reg, u32 val32)
38 {
39 int ret;
40
41 ret = pci_write_config_dword(dev, reg, val32);
42 if (ret != 0)
43 printk(KERN_ERR AMD8131_EDAC_MOD_STR
44 " PCI Access Write Error at 0x%x\n", reg);
45 }
46
47 /* Support up to two AMD8131 chipsets on a platform */
48 static struct amd8131_dev_info amd8131_devices[] = {
49 {
50 .inst = NORTH_A,
51 .devfn = DEVFN_PCIX_BRIDGE_NORTH_A,
52 .ctl_name = "AMD8131_PCIX_NORTH_A",
53 },
54 {
55 .inst = NORTH_B,
56 .devfn = DEVFN_PCIX_BRIDGE_NORTH_B,
57 .ctl_name = "AMD8131_PCIX_NORTH_B",
58 },
59 {
60 .inst = SOUTH_A,
61 .devfn = DEVFN_PCIX_BRIDGE_SOUTH_A,
62 .ctl_name = "AMD8131_PCIX_SOUTH_A",
63 },
64 {
65 .inst = SOUTH_B,
66 .devfn = DEVFN_PCIX_BRIDGE_SOUTH_B,
67 .ctl_name = "AMD8131_PCIX_SOUTH_B",
68 },
69 {.inst = NO_BRIDGE,},
70 };
71
amd8131_pcix_init(struct amd8131_dev_info * dev_info)72 static void amd8131_pcix_init(struct amd8131_dev_info *dev_info)
73 {
74 u32 val32;
75 struct pci_dev *dev = dev_info->dev;
76
77 /* First clear error detection flags */
78 edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
79 if (val32 & MEM_LIMIT_MASK)
80 edac_pci_write_dword(dev, REG_MEM_LIM, val32);
81
82 /* Clear Discard Timer Timedout flag */
83 edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
84 if (val32 & INT_CTLR_DTS)
85 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
86
87 /* Clear CRC Error flag on link side A */
88 edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
89 if (val32 & LNK_CTRL_CRCERR_A)
90 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
91
92 /* Clear CRC Error flag on link side B */
93 edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
94 if (val32 & LNK_CTRL_CRCERR_B)
95 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
96
97 /*
98 * Then enable all error detections.
99 *
100 * Setup Discard Timer Sync Flood Enable,
101 * System Error Enable and Parity Error Enable.
102 */
103 edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
104 val32 |= INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE;
105 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
106
107 /* Enable overall SERR Error detection */
108 edac_pci_read_dword(dev, REG_STS_CMD, &val32);
109 val32 |= STS_CMD_SERREN;
110 edac_pci_write_dword(dev, REG_STS_CMD, val32);
111
112 /* Setup CRC Flood Enable for link side A */
113 edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
114 val32 |= LNK_CTRL_CRCFEN;
115 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
116
117 /* Setup CRC Flood Enable for link side B */
118 edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
119 val32 |= LNK_CTRL_CRCFEN;
120 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
121 }
122
amd8131_pcix_exit(struct amd8131_dev_info * dev_info)123 static void amd8131_pcix_exit(struct amd8131_dev_info *dev_info)
124 {
125 u32 val32;
126 struct pci_dev *dev = dev_info->dev;
127
128 /* Disable SERR, PERR and DTSE Error detection */
129 edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
130 val32 &= ~(INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE);
131 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
132
133 /* Disable overall System Error detection */
134 edac_pci_read_dword(dev, REG_STS_CMD, &val32);
135 val32 &= ~STS_CMD_SERREN;
136 edac_pci_write_dword(dev, REG_STS_CMD, val32);
137
138 /* Disable CRC Sync Flood on link side A */
139 edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
140 val32 &= ~LNK_CTRL_CRCFEN;
141 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
142
143 /* Disable CRC Sync Flood on link side B */
144 edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
145 val32 &= ~LNK_CTRL_CRCFEN;
146 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
147 }
148
amd8131_pcix_check(struct edac_pci_ctl_info * edac_dev)149 static void amd8131_pcix_check(struct edac_pci_ctl_info *edac_dev)
150 {
151 struct amd8131_dev_info *dev_info = edac_dev->pvt_info;
152 struct pci_dev *dev = dev_info->dev;
153 u32 val32;
154
155 /* Check PCI-X Bridge Memory Base-Limit Register for errors */
156 edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
157 if (val32 & MEM_LIMIT_MASK) {
158 printk(KERN_INFO "Error(s) in mem limit register "
159 "on %s bridge\n", dev_info->ctl_name);
160 printk(KERN_INFO "DPE: %d, RSE: %d, RMA: %d\n"
161 "RTA: %d, STA: %d, MDPE: %d\n",
162 val32 & MEM_LIMIT_DPE,
163 val32 & MEM_LIMIT_RSE,
164 val32 & MEM_LIMIT_RMA,
165 val32 & MEM_LIMIT_RTA,
166 val32 & MEM_LIMIT_STA,
167 val32 & MEM_LIMIT_MDPE);
168
169 val32 |= MEM_LIMIT_MASK;
170 edac_pci_write_dword(dev, REG_MEM_LIM, val32);
171
172 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
173 }
174
175 /* Check if Discard Timer timed out */
176 edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
177 if (val32 & INT_CTLR_DTS) {
178 printk(KERN_INFO "Error(s) in interrupt and control register "
179 "on %s bridge\n", dev_info->ctl_name);
180 printk(KERN_INFO "DTS: %d\n", val32 & INT_CTLR_DTS);
181
182 val32 |= INT_CTLR_DTS;
183 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
184
185 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
186 }
187
188 /* Check if CRC error happens on link side A */
189 edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
190 if (val32 & LNK_CTRL_CRCERR_A) {
191 printk(KERN_INFO "Error(s) in link conf and control register "
192 "on %s bridge\n", dev_info->ctl_name);
193 printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_A);
194
195 val32 |= LNK_CTRL_CRCERR_A;
196 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
197
198 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
199 }
200
201 /* Check if CRC error happens on link side B */
202 edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
203 if (val32 & LNK_CTRL_CRCERR_B) {
204 printk(KERN_INFO "Error(s) in link conf and control register "
205 "on %s bridge\n", dev_info->ctl_name);
206 printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_B);
207
208 val32 |= LNK_CTRL_CRCERR_B;
209 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
210
211 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
212 }
213 }
214
215 static struct amd8131_info amd8131_chipset = {
216 .err_dev = PCI_DEVICE_ID_AMD_8131_APIC,
217 .devices = amd8131_devices,
218 .init = amd8131_pcix_init,
219 .exit = amd8131_pcix_exit,
220 .check = amd8131_pcix_check,
221 };
222
223 /*
224 * There are 4 PCIX Bridges on ATCA-6101 that share the same PCI Device ID,
225 * so amd8131_probe() would be called by kernel 4 times, with different
226 * address of pci_dev for each of them each time.
227 */
amd8131_probe(struct pci_dev * dev,const struct pci_device_id * id)228 static int amd8131_probe(struct pci_dev *dev, const struct pci_device_id *id)
229 {
230 struct amd8131_dev_info *dev_info;
231
232 for (dev_info = amd8131_chipset.devices; dev_info->inst != NO_BRIDGE;
233 dev_info++)
234 if (dev_info->devfn == dev->devfn)
235 break;
236
237 if (dev_info->inst == NO_BRIDGE) /* should never happen */
238 return -ENODEV;
239
240 /*
241 * We can't call pci_get_device() as we are used to do because
242 * there are 4 of them but pci_dev_get() instead.
243 */
244 dev_info->dev = pci_dev_get(dev);
245
246 if (pci_enable_device(dev_info->dev)) {
247 pci_dev_put(dev_info->dev);
248 printk(KERN_ERR "failed to enable:"
249 "vendor %x, device %x, devfn %x, name %s\n",
250 PCI_VENDOR_ID_AMD, amd8131_chipset.err_dev,
251 dev_info->devfn, dev_info->ctl_name);
252 return -ENODEV;
253 }
254
255 /*
256 * we do not allocate extra private structure for
257 * edac_pci_ctl_info, but make use of existing
258 * one instead.
259 */
260 dev_info->edac_idx = edac_pci_alloc_index();
261 dev_info->edac_dev = edac_pci_alloc_ctl_info(0, dev_info->ctl_name);
262 if (!dev_info->edac_dev)
263 return -ENOMEM;
264
265 dev_info->edac_dev->pvt_info = dev_info;
266 dev_info->edac_dev->dev = &dev_info->dev->dev;
267 dev_info->edac_dev->mod_name = AMD8131_EDAC_MOD_STR;
268 dev_info->edac_dev->ctl_name = dev_info->ctl_name;
269 dev_info->edac_dev->dev_name = dev_name(&dev_info->dev->dev);
270
271 if (edac_op_state == EDAC_OPSTATE_POLL)
272 dev_info->edac_dev->edac_check = amd8131_chipset.check;
273
274 if (amd8131_chipset.init)
275 amd8131_chipset.init(dev_info);
276
277 if (edac_pci_add_device(dev_info->edac_dev, dev_info->edac_idx) > 0) {
278 printk(KERN_ERR "failed edac_pci_add_device() for %s\n",
279 dev_info->ctl_name);
280 edac_pci_free_ctl_info(dev_info->edac_dev);
281 return -ENODEV;
282 }
283
284 printk(KERN_INFO "added one device on AMD8131 "
285 "vendor %x, device %x, devfn %x, name %s\n",
286 PCI_VENDOR_ID_AMD, amd8131_chipset.err_dev,
287 dev_info->devfn, dev_info->ctl_name);
288
289 return 0;
290 }
291
amd8131_remove(struct pci_dev * dev)292 static void amd8131_remove(struct pci_dev *dev)
293 {
294 struct amd8131_dev_info *dev_info;
295
296 for (dev_info = amd8131_chipset.devices; dev_info->inst != NO_BRIDGE;
297 dev_info++)
298 if (dev_info->devfn == dev->devfn)
299 break;
300
301 if (dev_info->inst == NO_BRIDGE) /* should never happen */
302 return;
303
304 if (dev_info->edac_dev) {
305 edac_pci_del_device(dev_info->edac_dev->dev);
306 edac_pci_free_ctl_info(dev_info->edac_dev);
307 }
308
309 if (amd8131_chipset.exit)
310 amd8131_chipset.exit(dev_info);
311
312 pci_dev_put(dev_info->dev);
313 }
314
315 static const struct pci_device_id amd8131_edac_pci_tbl[] = {
316 {
317 PCI_VEND_DEV(AMD, 8131_BRIDGE),
318 .subvendor = PCI_ANY_ID,
319 .subdevice = PCI_ANY_ID,
320 .class = 0,
321 .class_mask = 0,
322 .driver_data = 0,
323 },
324 {
325 0,
326 } /* table is NULL-terminated */
327 };
328 MODULE_DEVICE_TABLE(pci, amd8131_edac_pci_tbl);
329
330 static struct pci_driver amd8131_edac_driver = {
331 .name = AMD8131_EDAC_MOD_STR,
332 .probe = amd8131_probe,
333 .remove = amd8131_remove,
334 .id_table = amd8131_edac_pci_tbl,
335 };
336
amd8131_edac_init(void)337 static int __init amd8131_edac_init(void)
338 {
339 printk(KERN_INFO "AMD8131 EDAC driver " AMD8131_EDAC_REVISION "\n");
340 printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc.\n");
341
342 /* Only POLL mode supported so far */
343 edac_op_state = EDAC_OPSTATE_POLL;
344
345 return pci_register_driver(&amd8131_edac_driver);
346 }
347
amd8131_edac_exit(void)348 static void __exit amd8131_edac_exit(void)
349 {
350 pci_unregister_driver(&amd8131_edac_driver);
351 }
352
353 module_init(amd8131_edac_init);
354 module_exit(amd8131_edac_exit);
355
356 MODULE_LICENSE("GPL");
357 MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>\n");
358 MODULE_DESCRIPTION("AMD8131 HyperTransport PCI-X Tunnel EDAC kernel module");
359