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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_core.h" |
18 | |
19 | #define I82860_REVISION " Ver: 2.0.2 " __DATE__ |
20 | #define EDAC_MOD_STR "i82860_edac" |
21 | |
22 | #define i82860_printk(level, fmt, arg...) \ |
23 | edac_printk(level, "i82860", fmt, ##arg) |
24 | |
25 | #define i82860_mc_printk(mci, level, fmt, arg...) \ |
26 | edac_mc_chipset_printk(mci, level, "i82860", fmt, ##arg) |
27 | |
28 | #ifndef PCI_DEVICE_ID_INTEL_82860_0 |
29 | #define PCI_DEVICE_ID_INTEL_82860_0 0x2531 |
30 | #endif /* PCI_DEVICE_ID_INTEL_82860_0 */ |
31 | |
32 | #define I82860_MCHCFG 0x50 |
33 | #define I82860_GBA 0x60 |
34 | #define I82860_GBA_MASK 0x7FF |
35 | #define I82860_GBA_SHIFT 24 |
36 | #define I82860_ERRSTS 0xC8 |
37 | #define I82860_EAP 0xE4 |
38 | #define I82860_DERRCTL_STS 0xE2 |
39 | |
40 | enum i82860_chips { |
41 | I82860 = 0, |
42 | }; |
43 | |
44 | struct i82860_dev_info { |
45 | const char *ctl_name; |
46 | }; |
47 | |
48 | struct i82860_error_info { |
49 | u16 errsts; |
50 | u32 eap; |
51 | u16 derrsyn; |
52 | u16 errsts2; |
53 | }; |
54 | |
55 | static const struct i82860_dev_info i82860_devs[] = { |
56 | [I82860] = { |
57 | .ctl_name = "i82860"}, |
58 | }; |
59 | |
60 | static struct pci_dev *mci_pdev; /* init dev: in case that AGP code |
61 | * has already registered driver |
62 | */ |
63 | static struct edac_pci_ctl_info *i82860_pci; |
64 | |
65 | static void i82860_get_error_info(struct mem_ctl_info *mci, |
66 | struct i82860_error_info *info) |
67 | { |
68 | struct pci_dev *pdev; |
69 | |
70 | pdev = to_pci_dev(mci->dev); |
71 | |
72 | /* |
73 | * This is a mess because there is no atomic way to read all the |
74 | * registers at once and the registers can transition from CE being |
75 | * overwritten by UE. |
76 | */ |
77 | pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts); |
78 | pci_read_config_dword(pdev, I82860_EAP, &info->eap); |
79 | pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn); |
80 | pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts2); |
81 | |
82 | pci_write_bits16(pdev, I82860_ERRSTS, 0x0003, 0x0003); |
83 | |
84 | /* |
85 | * If the error is the same for both reads then the first set of reads |
86 | * is valid. If there is a change then there is a CE no info and the |
87 | * second set of reads is valid and should be UE info. |
88 | */ |
89 | if (!(info->errsts2 & 0x0003)) |
90 | return; |
91 | |
92 | if ((info->errsts ^ info->errsts2) & 0x0003) { |
93 | pci_read_config_dword(pdev, I82860_EAP, &info->eap); |
94 | pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn); |
95 | } |
96 | } |
97 | |
98 | static int i82860_process_error_info(struct mem_ctl_info *mci, |
99 | struct i82860_error_info *info, |
100 | int handle_errors) |
101 | { |
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_ce_no_info(mci, "UE overwrote CE"); |
112 | info->errsts = info->errsts2; |
113 | } |
114 | |
115 | info->eap >>= PAGE_SHIFT; |
116 | row = edac_mc_find_csrow_by_page(mci, info->eap); |
117 | |
118 | if (info->errsts & 0x0002) |
119 | edac_mc_handle_ue(mci, info->eap, 0, row, "i82860 UE"); |
120 | else |
121 | edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row, 0, |
122 | "i82860 UE"); |
123 | |
124 | return 1; |
125 | } |
126 | |
127 | static void i82860_check(struct mem_ctl_info *mci) |
128 | { |
129 | struct i82860_error_info info; |
130 | |
131 | debugf1("MC%d: %s()\n", mci->mc_idx, __func__); |
132 | i82860_get_error_info(mci, &info); |
133 | i82860_process_error_info(mci, &info, 1); |
134 | } |
135 | |
136 | static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev) |
137 | { |
138 | unsigned long last_cumul_size; |
139 | u16 mchcfg_ddim; /* DRAM Data Integrity Mode 0=none, 2=edac */ |
140 | u16 value; |
141 | u32 cumul_size; |
142 | struct csrow_info *csrow; |
143 | int index; |
144 | |
145 | pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim); |
146 | mchcfg_ddim = mchcfg_ddim & 0x180; |
147 | last_cumul_size = 0; |
148 | |
149 | /* The group row boundary (GRA) reg values are boundary address |
150 | * for each DRAM row with a granularity of 16MB. GRA regs are |
151 | * cumulative; therefore GRA15 will contain the total memory contained |
152 | * in all eight rows. |
153 | */ |
154 | for (index = 0; index < mci->nr_csrows; index++) { |
155 | csrow = &mci->csrows[index]; |
156 | pci_read_config_word(pdev, I82860_GBA + index * 2, &value); |
157 | cumul_size = (value & I82860_GBA_MASK) << |
158 | (I82860_GBA_SHIFT - PAGE_SHIFT); |
159 | debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index, |
160 | cumul_size); |
161 | |
162 | if (cumul_size == last_cumul_size) |
163 | continue; /* not populated */ |
164 | |
165 | csrow->first_page = last_cumul_size; |
166 | csrow->last_page = cumul_size - 1; |
167 | csrow->nr_pages = cumul_size - last_cumul_size; |
168 | last_cumul_size = cumul_size; |
169 | csrow->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */ |
170 | csrow->mtype = MEM_RMBS; |
171 | csrow->dtype = DEV_UNKNOWN; |
172 | csrow->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE; |
173 | } |
174 | } |
175 | |
176 | static int i82860_probe1(struct pci_dev *pdev, int dev_idx) |
177 | { |
178 | struct mem_ctl_info *mci; |
179 | struct i82860_error_info discard; |
180 | |
181 | /* RDRAM has channels but these don't map onto the abstractions that |
182 | edac uses. |
183 | The device groups from the GRA registers seem to map reasonably |
184 | well onto the notion of a chip select row. |
185 | There are 16 GRA registers and since the name is associated with |
186 | the channel and the GRA registers map to physical devices so we are |
187 | going to make 1 channel for group. |
188 | */ |
189 | mci = edac_mc_alloc(0, 16, 1, 0); |
190 | |
191 | if (!mci) |
192 | return -ENOMEM; |
193 | |
194 | debugf3("%s(): init mci\n", __func__); |
195 | mci->dev = &pdev->dev; |
196 | mci->mtype_cap = MEM_FLAG_DDR; |
197 | mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; |
198 | /* I"m not sure about this but I think that all RDRAM is SECDED */ |
199 | mci->edac_cap = EDAC_FLAG_SECDED; |
200 | mci->mod_name = EDAC_MOD_STR; |
201 | mci->mod_ver = I82860_REVISION; |
202 | mci->ctl_name = i82860_devs[dev_idx].ctl_name; |
203 | mci->dev_name = pci_name(pdev); |
204 | mci->edac_check = i82860_check; |
205 | mci->ctl_page_to_phys = NULL; |
206 | i82860_init_csrows(mci, pdev); |
207 | i82860_get_error_info(mci, &discard); /* clear counters */ |
208 | |
209 | /* Here we assume that we will never see multiple instances of this |
210 | * type of memory controller. The ID is therefore hardcoded to 0. |
211 | */ |
212 | if (edac_mc_add_mc(mci)) { |
213 | debugf3("%s(): failed edac_mc_add_mc()\n", __func__); |
214 | goto fail; |
215 | } |
216 | |
217 | /* allocating generic PCI control info */ |
218 | i82860_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR); |
219 | if (!i82860_pci) { |
220 | printk(KERN_WARNING |
221 | "%s(): Unable to create PCI control\n", |
222 | __func__); |
223 | printk(KERN_WARNING |
224 | "%s(): PCI error report via EDAC not setup\n", |
225 | __func__); |
226 | } |
227 | |
228 | /* get this far and it's successful */ |
229 | debugf3("%s(): success\n", __func__); |
230 | |
231 | return 0; |
232 | |
233 | fail: |
234 | edac_mc_free(mci); |
235 | return -ENODEV; |
236 | } |
237 | |
238 | /* returns count (>= 0), or negative on error */ |
239 | static int __devinit i82860_init_one(struct pci_dev *pdev, |
240 | const struct pci_device_id *ent) |
241 | { |
242 | int rc; |
243 | |
244 | debugf0("%s()\n", __func__); |
245 | i82860_printk(KERN_INFO, "i82860 init one\n"); |
246 | |
247 | if (pci_enable_device(pdev) < 0) |
248 | return -EIO; |
249 | |
250 | rc = i82860_probe1(pdev, ent->driver_data); |
251 | |
252 | if (rc == 0) |
253 | mci_pdev = pci_dev_get(pdev); |
254 | |
255 | return rc; |
256 | } |
257 | |
258 | static void __devexit i82860_remove_one(struct pci_dev *pdev) |
259 | { |
260 | struct mem_ctl_info *mci; |
261 | |
262 | debugf0("%s()\n", __func__); |
263 | |
264 | if (i82860_pci) |
265 | edac_pci_release_generic_ctl(i82860_pci); |
266 | |
267 | if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) |
268 | return; |
269 | |
270 | edac_mc_free(mci); |
271 | } |
272 | |
273 | static const struct pci_device_id i82860_pci_tbl[] __devinitdata = { |
274 | { |
275 | PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0, |
276 | I82860}, |
277 | { |
278 | 0, |
279 | } /* 0 terminated list. */ |
280 | }; |
281 | |
282 | MODULE_DEVICE_TABLE(pci, i82860_pci_tbl); |
283 | |
284 | static struct pci_driver i82860_driver = { |
285 | .name = EDAC_MOD_STR, |
286 | .probe = i82860_init_one, |
287 | .remove = __devexit_p(i82860_remove_one), |
288 | .id_table = i82860_pci_tbl, |
289 | }; |
290 | |
291 | static int __init i82860_init(void) |
292 | { |
293 | int pci_rc; |
294 | |
295 | debugf3("%s()\n", __func__); |
296 | |
297 | /* Ensure that the OPSTATE is set correctly for POLL or NMI */ |
298 | opstate_init(); |
299 | |
300 | if ((pci_rc = pci_register_driver(&i82860_driver)) < 0) |
301 | goto fail0; |
302 | |
303 | if (!mci_pdev) { |
304 | mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL, |
305 | PCI_DEVICE_ID_INTEL_82860_0, NULL); |
306 | |
307 | if (mci_pdev == NULL) { |
308 | debugf0("860 pci_get_device fail\n"); |
309 | pci_rc = -ENODEV; |
310 | goto fail1; |
311 | } |
312 | |
313 | pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl); |
314 | |
315 | if (pci_rc < 0) { |
316 | debugf0("860 init fail\n"); |
317 | pci_rc = -ENODEV; |
318 | goto fail1; |
319 | } |
320 | } |
321 | |
322 | return 0; |
323 | |
324 | fail1: |
325 | pci_unregister_driver(&i82860_driver); |
326 | |
327 | fail0: |
328 | if (mci_pdev != NULL) |
329 | pci_dev_put(mci_pdev); |
330 | |
331 | return pci_rc; |
332 | } |
333 | |
334 | static void __exit i82860_exit(void) |
335 | { |
336 | debugf3("%s()\n", __func__); |
337 | |
338 | pci_unregister_driver(&i82860_driver); |
339 | |
340 | if (mci_pdev != NULL) |
341 | pci_dev_put(mci_pdev); |
342 | } |
343 | |
344 | module_init(i82860_init); |
345 | module_exit(i82860_exit); |
346 | |
347 | MODULE_LICENSE("GPL"); |
348 | MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) " |
349 | "Ben Woodard <woodard@redhat.com>"); |
350 | MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers"); |
351 | |
352 | module_param(edac_op_state, int, 0444); |
353 | MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI"); |
354 |
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