1 /*
2 * Intel 82860 Memory Controller kernel module
3 * (C) 2005 Red Hat (http://www.redhat.com)
4 * This file may be distributed under the terms of the
5 * GNU General Public License.
6 *
7 * Written by Ben Woodard <woodard@redhat.com>
8 * shamelessly copied from and based upon the edac_i82875 driver
9 * by Thayne Harbaugh of Linux Networx. (http://lnxi.com)
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/pci.h>
15 #include <linux/pci_ids.h>
16 #include <linux/edac.h>
17 #include "edac_module.h"
18
19 #define EDAC_MOD_STR "i82860_edac"
20
21 #define i82860_printk(level, fmt, arg...) \
22 edac_printk(level, "i82860", fmt, ##arg)
23
24 #define i82860_mc_printk(mci, level, fmt, arg...) \
25 edac_mc_chipset_printk(mci, level, "i82860", fmt, ##arg)
26
27 #ifndef PCI_DEVICE_ID_INTEL_82860_0
28 #define PCI_DEVICE_ID_INTEL_82860_0 0x2531
29 #endif /* PCI_DEVICE_ID_INTEL_82860_0 */
30
31 #define I82860_MCHCFG 0x50
32 #define I82860_GBA 0x60
33 #define I82860_GBA_MASK 0x7FF
34 #define I82860_GBA_SHIFT 24
35 #define I82860_ERRSTS 0xC8
36 #define I82860_EAP 0xE4
37 #define I82860_DERRCTL_STS 0xE2
38
39 enum i82860_chips {
40 I82860 = 0,
41 };
42
43 struct i82860_dev_info {
44 const char *ctl_name;
45 };
46
47 struct i82860_error_info {
48 u16 errsts;
49 u32 eap;
50 u16 derrsyn;
51 u16 errsts2;
52 };
53
54 static const struct i82860_dev_info i82860_devs[] = {
55 [I82860] = {
56 .ctl_name = "i82860"},
57 };
58
59 static struct pci_dev *mci_pdev; /* init dev: in case that AGP code
60 * has already registered driver
61 */
62 static struct edac_pci_ctl_info *i82860_pci;
63
i82860_get_error_info(struct mem_ctl_info * mci,struct i82860_error_info * info)64 static void i82860_get_error_info(struct mem_ctl_info *mci,
65 struct i82860_error_info *info)
66 {
67 struct pci_dev *pdev;
68
69 pdev = to_pci_dev(mci->pdev);
70
71 /*
72 * This is a mess because there is no atomic way to read all the
73 * registers at once and the registers can transition from CE being
74 * overwritten by UE.
75 */
76 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts);
77 pci_read_config_dword(pdev, I82860_EAP, &info->eap);
78 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
79 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts2);
80
81 pci_write_bits16(pdev, I82860_ERRSTS, 0x0003, 0x0003);
82
83 /*
84 * If the error is the same for both reads then the first set of reads
85 * is valid. If there is a change then there is a CE no info and the
86 * second set of reads is valid and should be UE info.
87 */
88 if (!(info->errsts2 & 0x0003))
89 return;
90
91 if ((info->errsts ^ info->errsts2) & 0x0003) {
92 pci_read_config_dword(pdev, I82860_EAP, &info->eap);
93 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
94 }
95 }
96
i82860_process_error_info(struct mem_ctl_info * mci,struct i82860_error_info * info,int handle_errors)97 static int i82860_process_error_info(struct mem_ctl_info *mci,
98 struct i82860_error_info *info,
99 int handle_errors)
100 {
101 struct dimm_info *dimm;
102 int row;
103
104 if (!(info->errsts2 & 0x0003))
105 return 0;
106
107 if (!handle_errors)
108 return 1;
109
110 if ((info->errsts ^ info->errsts2) & 0x0003) {
111 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
112 -1, -1, -1, "UE overwrote CE", "");
113 info->errsts = info->errsts2;
114 }
115
116 info->eap >>= PAGE_SHIFT;
117 row = edac_mc_find_csrow_by_page(mci, info->eap);
118 dimm = mci->csrows[row]->channels[0]->dimm;
119
120 if (info->errsts & 0x0002)
121 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
122 info->eap, 0, 0,
123 dimm->location[0], dimm->location[1], -1,
124 "i82860 UE", "");
125 else
126 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
127 info->eap, 0, info->derrsyn,
128 dimm->location[0], dimm->location[1], -1,
129 "i82860 CE", "");
130
131 return 1;
132 }
133
i82860_check(struct mem_ctl_info * mci)134 static void i82860_check(struct mem_ctl_info *mci)
135 {
136 struct i82860_error_info info;
137
138 edac_dbg(1, "MC%d\n", mci->mc_idx);
139 i82860_get_error_info(mci, &info);
140 i82860_process_error_info(mci, &info, 1);
141 }
142
i82860_init_csrows(struct mem_ctl_info * mci,struct pci_dev * pdev)143 static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev)
144 {
145 unsigned long last_cumul_size;
146 u16 mchcfg_ddim; /* DRAM Data Integrity Mode 0=none, 2=edac */
147 u16 value;
148 u32 cumul_size;
149 struct csrow_info *csrow;
150 struct dimm_info *dimm;
151 int index;
152
153 pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim);
154 mchcfg_ddim = mchcfg_ddim & 0x180;
155 last_cumul_size = 0;
156
157 /* The group row boundary (GRA) reg values are boundary address
158 * for each DRAM row with a granularity of 16MB. GRA regs are
159 * cumulative; therefore GRA15 will contain the total memory contained
160 * in all eight rows.
161 */
162 for (index = 0; index < mci->nr_csrows; index++) {
163 csrow = mci->csrows[index];
164 dimm = csrow->channels[0]->dimm;
165
166 pci_read_config_word(pdev, I82860_GBA + index * 2, &value);
167 cumul_size = (value & I82860_GBA_MASK) <<
168 (I82860_GBA_SHIFT - PAGE_SHIFT);
169 edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
170
171 if (cumul_size == last_cumul_size)
172 continue; /* not populated */
173
174 csrow->first_page = last_cumul_size;
175 csrow->last_page = cumul_size - 1;
176 dimm->nr_pages = cumul_size - last_cumul_size;
177 last_cumul_size = cumul_size;
178 dimm->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */
179 dimm->mtype = MEM_RMBS;
180 dimm->dtype = DEV_UNKNOWN;
181 dimm->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE;
182 }
183 }
184
i82860_probe1(struct pci_dev * pdev,int dev_idx)185 static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
186 {
187 struct mem_ctl_info *mci;
188 struct edac_mc_layer layers[2];
189 struct i82860_error_info discard;
190
191 /*
192 * RDRAM has channels but these don't map onto the csrow abstraction.
193 * According with the datasheet, there are 2 Rambus channels, supporting
194 * up to 16 direct RDRAM devices.
195 * The device groups from the GRA registers seem to map reasonably
196 * well onto the notion of a chip select row.
197 * There are 16 GRA registers and since the name is associated with
198 * the channel and the GRA registers map to physical devices so we are
199 * going to make 1 channel for group.
200 */
201 layers[0].type = EDAC_MC_LAYER_CHANNEL;
202 layers[0].size = 2;
203 layers[0].is_virt_csrow = true;
204 layers[1].type = EDAC_MC_LAYER_SLOT;
205 layers[1].size = 8;
206 layers[1].is_virt_csrow = true;
207 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
208 if (!mci)
209 return -ENOMEM;
210
211 edac_dbg(3, "init mci\n");
212 mci->pdev = &pdev->dev;
213 mci->mtype_cap = MEM_FLAG_DDR;
214 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
215 /* I"m not sure about this but I think that all RDRAM is SECDED */
216 mci->edac_cap = EDAC_FLAG_SECDED;
217 mci->mod_name = EDAC_MOD_STR;
218 mci->ctl_name = i82860_devs[dev_idx].ctl_name;
219 mci->dev_name = pci_name(pdev);
220 mci->edac_check = i82860_check;
221 mci->ctl_page_to_phys = NULL;
222 i82860_init_csrows(mci, pdev);
223 i82860_get_error_info(mci, &discard); /* clear counters */
224
225 /* Here we assume that we will never see multiple instances of this
226 * type of memory controller. The ID is therefore hardcoded to 0.
227 */
228 if (edac_mc_add_mc(mci)) {
229 edac_dbg(3, "failed edac_mc_add_mc()\n");
230 goto fail;
231 }
232
233 /* allocating generic PCI control info */
234 i82860_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
235 if (!i82860_pci) {
236 printk(KERN_WARNING
237 "%s(): Unable to create PCI control\n",
238 __func__);
239 printk(KERN_WARNING
240 "%s(): PCI error report via EDAC not setup\n",
241 __func__);
242 }
243
244 /* get this far and it's successful */
245 edac_dbg(3, "success\n");
246
247 return 0;
248
249 fail:
250 edac_mc_free(mci);
251 return -ENODEV;
252 }
253
254 /* returns count (>= 0), or negative on error */
i82860_init_one(struct pci_dev * pdev,const struct pci_device_id * ent)255 static int i82860_init_one(struct pci_dev *pdev,
256 const struct pci_device_id *ent)
257 {
258 int rc;
259
260 edac_dbg(0, "\n");
261 i82860_printk(KERN_INFO, "i82860 init one\n");
262
263 if (pci_enable_device(pdev) < 0)
264 return -EIO;
265
266 rc = i82860_probe1(pdev, ent->driver_data);
267
268 if (rc == 0)
269 mci_pdev = pci_dev_get(pdev);
270
271 return rc;
272 }
273
i82860_remove_one(struct pci_dev * pdev)274 static void i82860_remove_one(struct pci_dev *pdev)
275 {
276 struct mem_ctl_info *mci;
277
278 edac_dbg(0, "\n");
279
280 if (i82860_pci)
281 edac_pci_release_generic_ctl(i82860_pci);
282
283 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
284 return;
285
286 edac_mc_free(mci);
287 }
288
289 static const struct pci_device_id i82860_pci_tbl[] = {
290 {
291 PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
292 I82860},
293 {
294 0,
295 } /* 0 terminated list. */
296 };
297
298 MODULE_DEVICE_TABLE(pci, i82860_pci_tbl);
299
300 static struct pci_driver i82860_driver = {
301 .name = EDAC_MOD_STR,
302 .probe = i82860_init_one,
303 .remove = i82860_remove_one,
304 .id_table = i82860_pci_tbl,
305 };
306
i82860_init(void)307 static int __init i82860_init(void)
308 {
309 int pci_rc;
310
311 edac_dbg(3, "\n");
312
313 /* Ensure that the OPSTATE is set correctly for POLL or NMI */
314 opstate_init();
315
316 if ((pci_rc = pci_register_driver(&i82860_driver)) < 0)
317 goto fail0;
318
319 if (!mci_pdev) {
320 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
321 PCI_DEVICE_ID_INTEL_82860_0, NULL);
322
323 if (mci_pdev == NULL) {
324 edac_dbg(0, "860 pci_get_device fail\n");
325 pci_rc = -ENODEV;
326 goto fail1;
327 }
328
329 pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl);
330
331 if (pci_rc < 0) {
332 edac_dbg(0, "860 init fail\n");
333 pci_rc = -ENODEV;
334 goto fail1;
335 }
336 }
337
338 return 0;
339
340 fail1:
341 pci_unregister_driver(&i82860_driver);
342
343 fail0:
344 pci_dev_put(mci_pdev);
345 return pci_rc;
346 }
347
i82860_exit(void)348 static void __exit i82860_exit(void)
349 {
350 edac_dbg(3, "\n");
351 pci_unregister_driver(&i82860_driver);
352 pci_dev_put(mci_pdev);
353 }
354
355 module_init(i82860_init);
356 module_exit(i82860_exit);
357
358 MODULE_LICENSE("GPL");
359 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) "
360 "Ben Woodard <woodard@redhat.com>");
361 MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers");
362
363 module_param(edac_op_state, int, 0444);
364 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
365