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1 /*
2 * Intel 82443BX/GX (440BX/GX chipset) Memory Controller EDAC kernel
3 * module (C) 2006 Tim Small
4 *
5 * This file may be distributed under the terms of the GNU General
6 * Public License.
7 *
8 * Written by Tim Small <tim@buttersideup.com>, based on work by Linux
9 * Networx, Thayne Harbaugh, Dan Hollis <goemon at anime dot net> and
10 * others.
11 *
12 * 440GX fix by Jason Uhlenkott <juhlenko@akamai.com>.
13 *
14 * Written with reference to 82443BX Host Bridge Datasheet:
15 * http://download.intel.com/design/chipsets/datashts/29063301.pdf
16 * references to this document given in [].
17 *
18 * This module doesn't support the 440LX, but it may be possible to
19 * make it do so (the 440LX's register definitions are different, but
20 * not completely so - I haven't studied them in enough detail to know
21 * how easy this would be).
22 */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26
27 #include <linux/pci.h>
28 #include <linux/pci_ids.h>
29
30
31 #include <linux/edac.h>
32 #include "edac_module.h"
33
34 #define EDAC_MOD_STR "i82443bxgx_edac"
35
36 /* The 82443BX supports SDRAM, or EDO (EDO for mobile only), "Memory
37 * Size: 8 MB to 512 MB (1GB with Registered DIMMs) with eight memory
38 * rows" "The 82443BX supports multiple-bit error detection and
39 * single-bit error correction when ECC mode is enabled and
40 * single/multi-bit error detection when correction is disabled.
41 * During writes to the DRAM, the 82443BX generates ECC for the data
42 * on a QWord basis. Partial QWord writes require a read-modify-write
43 * cycle when ECC is enabled."
44 */
45
46 /* "Additionally, the 82443BX ensures that the data is corrected in
47 * main memory so that accumulation of errors is prevented. Another
48 * error within the same QWord would result in a double-bit error
49 * which is unrecoverable. This is known as hardware scrubbing since
50 * it requires no software intervention to correct the data in memory."
51 */
52
53 /* [Also see page 100 (section 4.3), "DRAM Interface"]
54 * [Also see page 112 (section 4.6.1.4), ECC]
55 */
56
57 #define I82443BXGX_NR_CSROWS 8
58 #define I82443BXGX_NR_CHANS 1
59 #define I82443BXGX_NR_DIMMS 4
60
61 /* 82443 PCI Device 0 */
62 #define I82443BXGX_NBXCFG 0x50 /* 32bit register starting at this PCI
63 * config space offset */
64 #define I82443BXGX_NBXCFG_OFFSET_NON_ECCROW 24 /* Array of bits, zero if
65 * row is non-ECC */
66 #define I82443BXGX_NBXCFG_OFFSET_DRAM_FREQ 12 /* 2 bits,00=100MHz,10=66 MHz */
67
68 #define I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY 7 /* 2 bits: */
69 #define I82443BXGX_NBXCFG_INTEGRITY_NONE 0x0 /* 00 = Non-ECC */
70 #define I82443BXGX_NBXCFG_INTEGRITY_EC 0x1 /* 01 = EC (only) */
71 #define I82443BXGX_NBXCFG_INTEGRITY_ECC 0x2 /* 10 = ECC */
72 #define I82443BXGX_NBXCFG_INTEGRITY_SCRUB 0x3 /* 11 = ECC + HW Scrub */
73
74 #define I82443BXGX_NBXCFG_OFFSET_ECC_DIAG_ENABLE 6
75
76 /* 82443 PCI Device 0 */
77 #define I82443BXGX_EAP 0x80 /* 32bit register starting at this PCI
78 * config space offset, Error Address
79 * Pointer Register */
80 #define I82443BXGX_EAP_OFFSET_EAP 12 /* High 20 bits of error address */
81 #define I82443BXGX_EAP_OFFSET_MBE BIT(1) /* Err at EAP was multi-bit (W1TC) */
82 #define I82443BXGX_EAP_OFFSET_SBE BIT(0) /* Err at EAP was single-bit (W1TC) */
83
84 #define I82443BXGX_ERRCMD 0x90 /* 8bit register starting at this PCI
85 * config space offset. */
86 #define I82443BXGX_ERRCMD_OFFSET_SERR_ON_MBE BIT(1) /* 1 = enable */
87 #define I82443BXGX_ERRCMD_OFFSET_SERR_ON_SBE BIT(0) /* 1 = enable */
88
89 #define I82443BXGX_ERRSTS 0x91 /* 16bit register starting at this PCI
90 * config space offset. */
91 #define I82443BXGX_ERRSTS_OFFSET_MBFRE 5 /* 3 bits - first err row multibit */
92 #define I82443BXGX_ERRSTS_OFFSET_MEF BIT(4) /* 1 = MBE occurred */
93 #define I82443BXGX_ERRSTS_OFFSET_SBFRE 1 /* 3 bits - first err row singlebit */
94 #define I82443BXGX_ERRSTS_OFFSET_SEF BIT(0) /* 1 = SBE occurred */
95
96 #define I82443BXGX_DRAMC 0x57 /* 8bit register starting at this PCI
97 * config space offset. */
98 #define I82443BXGX_DRAMC_OFFSET_DT 3 /* 2 bits, DRAM Type */
99 #define I82443BXGX_DRAMC_DRAM_IS_EDO 0 /* 00 = EDO */
100 #define I82443BXGX_DRAMC_DRAM_IS_SDRAM 1 /* 01 = SDRAM */
101 #define I82443BXGX_DRAMC_DRAM_IS_RSDRAM 2 /* 10 = Registered SDRAM */
102
103 #define I82443BXGX_DRB 0x60 /* 8x 8bit registers starting at this PCI
104 * config space offset. */
105
106 /* FIXME - don't poll when ECC disabled? */
107
108 struct i82443bxgx_edacmc_error_info {
109 u32 eap;
110 };
111
112 static struct edac_pci_ctl_info *i82443bxgx_pci;
113
114 static struct pci_dev *mci_pdev; /* init dev: in case that AGP code has
115 * already registered driver
116 */
117
118 static int i82443bxgx_registered = 1;
119
120 static void i82443bxgx_edacmc_get_error_info(struct mem_ctl_info *mci,
121 struct i82443bxgx_edacmc_error_info
122 *info)
123 {
124 struct pci_dev *pdev;
125 pdev = to_pci_dev(mci->pdev);
126 pci_read_config_dword(pdev, I82443BXGX_EAP, &info->eap);
127 if (info->eap & I82443BXGX_EAP_OFFSET_SBE)
128 /* Clear error to allow next error to be reported [p.61] */
129 pci_write_bits32(pdev, I82443BXGX_EAP,
130 I82443BXGX_EAP_OFFSET_SBE,
131 I82443BXGX_EAP_OFFSET_SBE);
132
133 if (info->eap & I82443BXGX_EAP_OFFSET_MBE)
134 /* Clear error to allow next error to be reported [p.61] */
135 pci_write_bits32(pdev, I82443BXGX_EAP,
136 I82443BXGX_EAP_OFFSET_MBE,
137 I82443BXGX_EAP_OFFSET_MBE);
138 }
139
140 static int i82443bxgx_edacmc_process_error_info(struct mem_ctl_info *mci,
141 struct
142 i82443bxgx_edacmc_error_info
143 *info, int handle_errors)
144 {
145 int error_found = 0;
146 u32 eapaddr, page, pageoffset;
147
148 /* bits 30:12 hold the 4kb block in which the error occurred
149 * [p.61] */
150 eapaddr = (info->eap & 0xfffff000);
151 page = eapaddr >> PAGE_SHIFT;
152 pageoffset = eapaddr - (page << PAGE_SHIFT);
153
154 if (info->eap & I82443BXGX_EAP_OFFSET_SBE) {
155 error_found = 1;
156 if (handle_errors)
157 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
158 page, pageoffset, 0,
159 edac_mc_find_csrow_by_page(mci, page),
160 0, -1, mci->ctl_name, "");
161 }
162
163 if (info->eap & I82443BXGX_EAP_OFFSET_MBE) {
164 error_found = 1;
165 if (handle_errors)
166 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
167 page, pageoffset, 0,
168 edac_mc_find_csrow_by_page(mci, page),
169 0, -1, mci->ctl_name, "");
170 }
171
172 return error_found;
173 }
174
175 static void i82443bxgx_edacmc_check(struct mem_ctl_info *mci)
176 {
177 struct i82443bxgx_edacmc_error_info info;
178
179 edac_dbg(1, "MC%d\n", mci->mc_idx);
180 i82443bxgx_edacmc_get_error_info(mci, &info);
181 i82443bxgx_edacmc_process_error_info(mci, &info, 1);
182 }
183
184 static void i82443bxgx_init_csrows(struct mem_ctl_info *mci,
185 struct pci_dev *pdev,
186 enum edac_type edac_mode,
187 enum mem_type mtype)
188 {
189 struct csrow_info *csrow;
190 struct dimm_info *dimm;
191 int index;
192 u8 drbar, dramc;
193 u32 row_base, row_high_limit, row_high_limit_last;
194
195 pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
196 row_high_limit_last = 0;
197 for (index = 0; index < mci->nr_csrows; index++) {
198 csrow = mci->csrows[index];
199 dimm = csrow->channels[0]->dimm;
200
201 pci_read_config_byte(pdev, I82443BXGX_DRB + index, &drbar);
202 edac_dbg(1, "MC%d: Row=%d DRB = %#0x\n",
203 mci->mc_idx, index, drbar);
204 row_high_limit = ((u32) drbar << 23);
205 /* find the DRAM Chip Select Base address and mask */
206 edac_dbg(1, "MC%d: Row=%d, Boundary Address=%#0x, Last = %#0x\n",
207 mci->mc_idx, index, row_high_limit,
208 row_high_limit_last);
209
210 /* 440GX goes to 2GB, represented with a DRB of 0. */
211 if (row_high_limit_last && !row_high_limit)
212 row_high_limit = 1UL << 31;
213
214 /* This row is empty [p.49] */
215 if (row_high_limit == row_high_limit_last)
216 continue;
217 row_base = row_high_limit_last;
218 csrow->first_page = row_base >> PAGE_SHIFT;
219 csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
220 dimm->nr_pages = csrow->last_page - csrow->first_page + 1;
221 /* EAP reports in 4kilobyte granularity [61] */
222 dimm->grain = 1 << 12;
223 dimm->mtype = mtype;
224 /* I don't think 440BX can tell you device type? FIXME? */
225 dimm->dtype = DEV_UNKNOWN;
226 /* Mode is global to all rows on 440BX */
227 dimm->edac_mode = edac_mode;
228 row_high_limit_last = row_high_limit;
229 }
230 }
231
232 static int i82443bxgx_edacmc_probe1(struct pci_dev *pdev, int dev_idx)
233 {
234 struct mem_ctl_info *mci;
235 struct edac_mc_layer layers[2];
236 u8 dramc;
237 u32 nbxcfg, ecc_mode;
238 enum mem_type mtype;
239 enum edac_type edac_mode;
240
241 edac_dbg(0, "MC:\n");
242
243 /* Something is really hosed if PCI config space reads from
244 * the MC aren't working.
245 */
246 if (pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg))
247 return -EIO;
248
249 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
250 layers[0].size = I82443BXGX_NR_CSROWS;
251 layers[0].is_virt_csrow = true;
252 layers[1].type = EDAC_MC_LAYER_CHANNEL;
253 layers[1].size = I82443BXGX_NR_CHANS;
254 layers[1].is_virt_csrow = false;
255 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
256 if (mci == NULL)
257 return -ENOMEM;
258
259 edac_dbg(0, "MC: mci = %p\n", mci);
260 mci->pdev = &pdev->dev;
261 mci->mtype_cap = MEM_FLAG_EDO | MEM_FLAG_SDR | MEM_FLAG_RDR;
262 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
263 pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
264 switch ((dramc >> I82443BXGX_DRAMC_OFFSET_DT) & (BIT(0) | BIT(1))) {
265 case I82443BXGX_DRAMC_DRAM_IS_EDO:
266 mtype = MEM_EDO;
267 break;
268 case I82443BXGX_DRAMC_DRAM_IS_SDRAM:
269 mtype = MEM_SDR;
270 break;
271 case I82443BXGX_DRAMC_DRAM_IS_RSDRAM:
272 mtype = MEM_RDR;
273 break;
274 default:
275 edac_dbg(0, "Unknown/reserved DRAM type value in DRAMC register!\n");
276 mtype = -MEM_UNKNOWN;
277 }
278
279 if ((mtype == MEM_SDR) || (mtype == MEM_RDR))
280 mci->edac_cap = mci->edac_ctl_cap;
281 else
282 mci->edac_cap = EDAC_FLAG_NONE;
283
284 mci->scrub_cap = SCRUB_FLAG_HW_SRC;
285 pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg);
286 ecc_mode = ((nbxcfg >> I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY) &
287 (BIT(0) | BIT(1)));
288
289 mci->scrub_mode = (ecc_mode == I82443BXGX_NBXCFG_INTEGRITY_SCRUB)
290 ? SCRUB_HW_SRC : SCRUB_NONE;
291
292 switch (ecc_mode) {
293 case I82443BXGX_NBXCFG_INTEGRITY_NONE:
294 edac_mode = EDAC_NONE;
295 break;
296 case I82443BXGX_NBXCFG_INTEGRITY_EC:
297 edac_mode = EDAC_EC;
298 break;
299 case I82443BXGX_NBXCFG_INTEGRITY_ECC:
300 case I82443BXGX_NBXCFG_INTEGRITY_SCRUB:
301 edac_mode = EDAC_SECDED;
302 break;
303 default:
304 edac_dbg(0, "Unknown/reserved ECC state in NBXCFG register!\n");
305 edac_mode = EDAC_UNKNOWN;
306 break;
307 }
308
309 i82443bxgx_init_csrows(mci, pdev, edac_mode, mtype);
310
311 /* Many BIOSes don't clear error flags on boot, so do this
312 * here, or we get "phantom" errors occurring at module-load
313 * time. */
314 pci_write_bits32(pdev, I82443BXGX_EAP,
315 (I82443BXGX_EAP_OFFSET_SBE |
316 I82443BXGX_EAP_OFFSET_MBE),
317 (I82443BXGX_EAP_OFFSET_SBE |
318 I82443BXGX_EAP_OFFSET_MBE));
319
320 mci->mod_name = EDAC_MOD_STR;
321 mci->ctl_name = "I82443BXGX";
322 mci->dev_name = pci_name(pdev);
323 mci->edac_check = i82443bxgx_edacmc_check;
324 mci->ctl_page_to_phys = NULL;
325
326 if (edac_mc_add_mc(mci)) {
327 edac_dbg(3, "failed edac_mc_add_mc()\n");
328 goto fail;
329 }
330
331 /* allocating generic PCI control info */
332 i82443bxgx_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
333 if (!i82443bxgx_pci) {
334 printk(KERN_WARNING
335 "%s(): Unable to create PCI control\n",
336 __func__);
337 printk(KERN_WARNING
338 "%s(): PCI error report via EDAC not setup\n",
339 __func__);
340 }
341
342 edac_dbg(3, "MC: success\n");
343 return 0;
344
345 fail:
346 edac_mc_free(mci);
347 return -ENODEV;
348 }
349
350 /* returns count (>= 0), or negative on error */
351 static int i82443bxgx_edacmc_init_one(struct pci_dev *pdev,
352 const struct pci_device_id *ent)
353 {
354 int rc;
355
356 edac_dbg(0, "MC:\n");
357
358 /* don't need to call pci_enable_device() */
359 rc = i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
360
361 if (mci_pdev == NULL)
362 mci_pdev = pci_dev_get(pdev);
363
364 return rc;
365 }
366
367 static void i82443bxgx_edacmc_remove_one(struct pci_dev *pdev)
368 {
369 struct mem_ctl_info *mci;
370
371 edac_dbg(0, "\n");
372
373 if (i82443bxgx_pci)
374 edac_pci_release_generic_ctl(i82443bxgx_pci);
375
376 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
377 return;
378
379 edac_mc_free(mci);
380 }
381
382 static const struct pci_device_id i82443bxgx_pci_tbl[] = {
383 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_0)},
384 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_2)},
385 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0)},
386 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2)},
387 {0,} /* 0 terminated list. */
388 };
389
390 MODULE_DEVICE_TABLE(pci, i82443bxgx_pci_tbl);
391
392 static struct pci_driver i82443bxgx_edacmc_driver = {
393 .name = EDAC_MOD_STR,
394 .probe = i82443bxgx_edacmc_init_one,
395 .remove = i82443bxgx_edacmc_remove_one,
396 .id_table = i82443bxgx_pci_tbl,
397 };
398
399 static int __init i82443bxgx_edacmc_init(void)
400 {
401 int pci_rc;
402 /* Ensure that the OPSTATE is set correctly for POLL or NMI */
403 opstate_init();
404
405 pci_rc = pci_register_driver(&i82443bxgx_edacmc_driver);
406 if (pci_rc < 0)
407 goto fail0;
408
409 if (mci_pdev == NULL) {
410 const struct pci_device_id *id = &i82443bxgx_pci_tbl[0];
411 int i = 0;
412 i82443bxgx_registered = 0;
413
414 while (mci_pdev == NULL && id->vendor != 0) {
415 mci_pdev = pci_get_device(id->vendor,
416 id->device, NULL);
417 i++;
418 id = &i82443bxgx_pci_tbl[i];
419 }
420 if (!mci_pdev) {
421 edac_dbg(0, "i82443bxgx pci_get_device fail\n");
422 pci_rc = -ENODEV;
423 goto fail1;
424 }
425
426 pci_rc = i82443bxgx_edacmc_init_one(mci_pdev, i82443bxgx_pci_tbl);
427
428 if (pci_rc < 0) {
429 edac_dbg(0, "i82443bxgx init fail\n");
430 pci_rc = -ENODEV;
431 goto fail1;
432 }
433 }
434
435 return 0;
436
437 fail1:
438 pci_unregister_driver(&i82443bxgx_edacmc_driver);
439
440 fail0:
441 pci_dev_put(mci_pdev);
442 return pci_rc;
443 }
444
445 static void __exit i82443bxgx_edacmc_exit(void)
446 {
447 pci_unregister_driver(&i82443bxgx_edacmc_driver);
448
449 if (!i82443bxgx_registered)
450 i82443bxgx_edacmc_remove_one(mci_pdev);
451
452 pci_dev_put(mci_pdev);
453 }
454
455 module_init(i82443bxgx_edacmc_init);
456 module_exit(i82443bxgx_edacmc_exit);
457
458 MODULE_LICENSE("GPL");
459 MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD");
460 MODULE_DESCRIPTION("EDAC MC support for Intel 82443BX/GX memory controllers");
461
462 module_param(edac_op_state, int, 0444);
463 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");