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1 | /* | |
2 | * Radisys 82600 Embedded chipset Memory Controller kernel module | |
3 | * (C) 2005 EADS Astrium | |
4 | * This file may be distributed under the terms of the | |
5 | * GNU General Public License. | |
6 | * | |
7 | * Written by Tim Small <tim@buttersideup.com>, based on work by Thayne | |
8 | * Harbaugh, Dan Hollis <goemon at anime dot net> and others. | |
9 | * | |
10 | * $Id: edac_r82600.c,v 1.1.2.6 2005/10/05 00:43:44 dsp_llnl Exp $ | |
11 | * | |
12 | * Written with reference to 82600 High Integration Dual PCI System | |
13 | * Controller Data Book: | |
14 | * www.radisys.com/files/support_downloads/007-01277-0002.82600DataBook.pdf | |
15 | * references to this document given in [] | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/pci.h> | |
21 | #include <linux/pci_ids.h> | |
22 | #include <linux/edac.h> | |
23 | #include "edac_module.h" | |
24 | ||
25 | #define EDAC_MOD_STR "r82600_edac" | |
26 | ||
27 | #define r82600_printk(level, fmt, arg...) \ | |
28 | edac_printk(level, "r82600", fmt, ##arg) | |
29 | ||
30 | #define r82600_mc_printk(mci, level, fmt, arg...) \ | |
31 | edac_mc_chipset_printk(mci, level, "r82600", fmt, ##arg) | |
32 | ||
33 | /* Radisys say "The 82600 integrates a main memory SDRAM controller that | |
34 | * supports up to four banks of memory. The four banks can support a mix of | |
35 | * sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs, | |
36 | * each of which can be any size from 16MB to 512MB. Both registered (control | |
37 | * signals buffered) and unbuffered DIMM types are supported. Mixing of | |
38 | * registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs | |
39 | * is not allowed. The 82600 SDRAM interface operates at the same frequency as | |
40 | * the CPU bus, 66MHz, 100MHz or 133MHz." | |
41 | */ | |
42 | ||
43 | #define R82600_NR_CSROWS 4 | |
44 | #define R82600_NR_CHANS 1 | |
45 | #define R82600_NR_DIMMS 4 | |
46 | ||
47 | #define R82600_BRIDGE_ID 0x8200 | |
48 | ||
49 | /* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */ | |
50 | #define R82600_DRAMC 0x57 /* Various SDRAM related control bits | |
51 | * all bits are R/W | |
52 | * | |
53 | * 7 SDRAM ISA Hole Enable | |
54 | * 6 Flash Page Mode Enable | |
55 | * 5 ECC Enable: 1=ECC 0=noECC | |
56 | * 4 DRAM DIMM Type: 1= | |
57 | * 3 BIOS Alias Disable | |
58 | * 2 SDRAM BIOS Flash Write Enable | |
59 | * 1:0 SDRAM Refresh Rate: 00=Disabled | |
60 | * 01=7.8usec (256Mbit SDRAMs) | |
61 | * 10=15.6us 11=125usec | |
62 | */ | |
63 | ||
64 | #define R82600_SDRAMC 0x76 /* "SDRAM Control Register" | |
65 | * More SDRAM related control bits | |
66 | * all bits are R/W | |
67 | * | |
68 | * 15:8 Reserved. | |
69 | * | |
70 | * 7:5 Special SDRAM Mode Select | |
71 | * | |
72 | * 4 Force ECC | |
73 | * | |
74 | * 1=Drive ECC bits to 0 during | |
75 | * write cycles (i.e. ECC test mode) | |
76 | * | |
77 | * 0=Normal ECC functioning | |
78 | * | |
79 | * 3 Enhanced Paging Enable | |
80 | * | |
81 | * 2 CAS# Latency 0=3clks 1=2clks | |
82 | * | |
83 | * 1 RAS# to CAS# Delay 0=3 1=2 | |
84 | * | |
85 | * 0 RAS# Precharge 0=3 1=2 | |
86 | */ | |
87 | ||
88 | #define R82600_EAP 0x80 /* ECC Error Address Pointer Register | |
89 | * | |
90 | * 31 Disable Hardware Scrubbing (RW) | |
91 | * 0=Scrub on corrected read | |
92 | * 1=Don't scrub on corrected read | |
93 | * | |
94 | * 30:12 Error Address Pointer (RO) | |
95 | * Upper 19 bits of error address | |
96 | * | |
97 | * 11:4 Syndrome Bits (RO) | |
98 | * | |
99 | * 3 BSERR# on multibit error (RW) | |
100 | * 1=enable 0=disable | |
101 | * | |
102 | * 2 NMI on Single Bit Eror (RW) | |
103 | * 1=NMI triggered by SBE n.b. other | |
104 | * prerequeists | |
105 | * 0=NMI not triggered | |
106 | * | |
107 | * 1 MBE (R/WC) | |
108 | * read 1=MBE at EAP (see above) | |
109 | * read 0=no MBE, or SBE occurred first | |
110 | * write 1=Clear MBE status (must also | |
111 | * clear SBE) | |
112 | * write 0=NOP | |
113 | * | |
114 | * 1 SBE (R/WC) | |
115 | * read 1=SBE at EAP (see above) | |
116 | * read 0=no SBE, or MBE occurred first | |
117 | * write 1=Clear SBE status (must also | |
118 | * clear MBE) | |
119 | * write 0=NOP | |
120 | */ | |
121 | ||
122 | #define R82600_DRBA 0x60 /* + 0x60..0x63 SDRAM Row Boundary Address | |
123 | * Registers | |
124 | * | |
125 | * 7:0 Address lines 30:24 - upper limit of | |
126 | * each row [p57] | |
127 | */ | |
128 | ||
129 | struct r82600_error_info { | |
130 | u32 eapr; | |
131 | }; | |
132 | ||
133 | static bool disable_hardware_scrub; | |
134 | ||
135 | static struct edac_pci_ctl_info *r82600_pci; | |
136 | ||
137 | static void r82600_get_error_info(struct mem_ctl_info *mci, | |
138 | struct r82600_error_info *info) | |
139 | { | |
140 | struct pci_dev *pdev; | |
141 | ||
142 | pdev = to_pci_dev(mci->pdev); | |
143 | pci_read_config_dword(pdev, R82600_EAP, &info->eapr); | |
144 | ||
145 | if (info->eapr & BIT(0)) | |
146 | /* Clear error to allow next error to be reported [p.62] */ | |
147 | pci_write_bits32(pdev, R82600_EAP, | |
148 | ((u32) BIT(0) & (u32) BIT(1)), | |
149 | ((u32) BIT(0) & (u32) BIT(1))); | |
150 | ||
151 | if (info->eapr & BIT(1)) | |
152 | /* Clear error to allow next error to be reported [p.62] */ | |
153 | pci_write_bits32(pdev, R82600_EAP, | |
154 | ((u32) BIT(0) & (u32) BIT(1)), | |
155 | ((u32) BIT(0) & (u32) BIT(1))); | |
156 | } | |
157 | ||
158 | static int r82600_process_error_info(struct mem_ctl_info *mci, | |
159 | struct r82600_error_info *info, | |
160 | int handle_errors) | |
161 | { | |
162 | int error_found; | |
163 | u32 eapaddr, page; | |
164 | u32 syndrome; | |
165 | ||
166 | error_found = 0; | |
167 | ||
168 | /* bits 30:12 store the upper 19 bits of the 32 bit error address */ | |
169 | eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13; | |
170 | /* Syndrome in bits 11:4 [p.62] */ | |
171 | syndrome = (info->eapr >> 4) & 0xFF; | |
172 | ||
173 | /* the R82600 reports at less than page * | |
174 | * granularity (upper 19 bits only) */ | |
175 | page = eapaddr >> PAGE_SHIFT; | |
176 | ||
177 | if (info->eapr & BIT(0)) { /* CE? */ | |
178 | error_found = 1; | |
179 | ||
180 | if (handle_errors) | |
181 | edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, | |
182 | page, 0, syndrome, | |
183 | edac_mc_find_csrow_by_page(mci, page), | |
184 | 0, -1, | |
185 | mci->ctl_name, ""); | |
186 | } | |
187 | ||
188 | if (info->eapr & BIT(1)) { /* UE? */ | |
189 | error_found = 1; | |
190 | ||
191 | if (handle_errors) | |
192 | /* 82600 doesn't give enough info */ | |
193 | edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, | |
194 | page, 0, 0, | |
195 | edac_mc_find_csrow_by_page(mci, page), | |
196 | 0, -1, | |
197 | mci->ctl_name, ""); | |
198 | } | |
199 | ||
200 | return error_found; | |
201 | } | |
202 | ||
203 | static void r82600_check(struct mem_ctl_info *mci) | |
204 | { | |
205 | struct r82600_error_info info; | |
206 | ||
207 | edac_dbg(1, "MC%d\n", mci->mc_idx); | |
208 | r82600_get_error_info(mci, &info); | |
209 | r82600_process_error_info(mci, &info, 1); | |
210 | } | |
211 | ||
212 | static inline int ecc_enabled(u8 dramcr) | |
213 | { | |
214 | return dramcr & BIT(5); | |
215 | } | |
216 | ||
217 | static void r82600_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev, | |
218 | u8 dramcr) | |
219 | { | |
220 | struct csrow_info *csrow; | |
221 | struct dimm_info *dimm; | |
222 | int index; | |
223 | u8 drbar; /* SDRAM Row Boundary Address Register */ | |
224 | u32 row_high_limit, row_high_limit_last; | |
225 | u32 reg_sdram, ecc_on, row_base; | |
226 | ||
227 | ecc_on = ecc_enabled(dramcr); | |
228 | reg_sdram = dramcr & BIT(4); | |
229 | row_high_limit_last = 0; | |
230 | ||
231 | for (index = 0; index < mci->nr_csrows; index++) { | |
232 | csrow = mci->csrows[index]; | |
233 | dimm = csrow->channels[0]->dimm; | |
234 | ||
235 | /* find the DRAM Chip Select Base address and mask */ | |
236 | pci_read_config_byte(pdev, R82600_DRBA + index, &drbar); | |
237 | ||
238 | edac_dbg(1, "Row=%d DRBA = %#0x\n", index, drbar); | |
239 | ||
240 | row_high_limit = ((u32) drbar << 24); | |
241 | /* row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */ | |
242 | ||
243 | edac_dbg(1, "Row=%d, Boundary Address=%#0x, Last = %#0x\n", | |
244 | index, row_high_limit, row_high_limit_last); | |
245 | ||
246 | /* Empty row [p.57] */ | |
247 | if (row_high_limit == row_high_limit_last) | |
248 | continue; | |
249 | ||
250 | row_base = row_high_limit_last; | |
251 | ||
252 | csrow->first_page = row_base >> PAGE_SHIFT; | |
253 | csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1; | |
254 | ||
255 | dimm->nr_pages = csrow->last_page - csrow->first_page + 1; | |
256 | /* Error address is top 19 bits - so granularity is * | |
257 | * 14 bits */ | |
258 | dimm->grain = 1 << 14; | |
259 | dimm->mtype = reg_sdram ? MEM_RDDR : MEM_DDR; | |
260 | /* FIXME - check that this is unknowable with this chipset */ | |
261 | dimm->dtype = DEV_UNKNOWN; | |
262 | ||
263 | /* Mode is global on 82600 */ | |
264 | dimm->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE; | |
265 | row_high_limit_last = row_high_limit; | |
266 | } | |
267 | } | |
268 | ||
269 | static int r82600_probe1(struct pci_dev *pdev, int dev_idx) | |
270 | { | |
271 | struct mem_ctl_info *mci; | |
272 | struct edac_mc_layer layers[2]; | |
273 | u8 dramcr; | |
274 | u32 eapr; | |
275 | u32 scrub_disabled; | |
276 | u32 sdram_refresh_rate; | |
277 | struct r82600_error_info discard; | |
278 | ||
279 | edac_dbg(0, "\n"); | |
280 | pci_read_config_byte(pdev, R82600_DRAMC, &dramcr); | |
281 | pci_read_config_dword(pdev, R82600_EAP, &eapr); | |
282 | scrub_disabled = eapr & BIT(31); | |
283 | sdram_refresh_rate = dramcr & (BIT(0) | BIT(1)); | |
284 | edac_dbg(2, "sdram refresh rate = %#0x\n", sdram_refresh_rate); | |
285 | edac_dbg(2, "DRAMC register = %#0x\n", dramcr); | |
286 | layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; | |
287 | layers[0].size = R82600_NR_CSROWS; | |
288 | layers[0].is_virt_csrow = true; | |
289 | layers[1].type = EDAC_MC_LAYER_CHANNEL; | |
290 | layers[1].size = R82600_NR_CHANS; | |
291 | layers[1].is_virt_csrow = false; | |
292 | mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0); | |
293 | if (mci == NULL) | |
294 | return -ENOMEM; | |
295 | ||
296 | edac_dbg(0, "mci = %p\n", mci); | |
297 | mci->pdev = &pdev->dev; | |
298 | mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR; | |
299 | mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; | |
300 | /* FIXME try to work out if the chip leads have been used for COM2 | |
301 | * instead on this board? [MA6?] MAYBE: | |
302 | */ | |
303 | ||
304 | /* On the R82600, the pins for memory bits 72:65 - i.e. the * | |
305 | * EC bits are shared with the pins for COM2 (!), so if COM2 * | |
306 | * is enabled, we assume COM2 is wired up, and thus no EDAC * | |
307 | * is possible. */ | |
308 | mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; | |
309 | ||
310 | if (ecc_enabled(dramcr)) { | |
311 | if (scrub_disabled) | |
312 | edac_dbg(3, "mci = %p - Scrubbing disabled! EAP: %#0x\n", | |
313 | mci, eapr); | |
314 | } else | |
315 | mci->edac_cap = EDAC_FLAG_NONE; | |
316 | ||
317 | mci->mod_name = EDAC_MOD_STR; | |
318 | mci->ctl_name = "R82600"; | |
319 | mci->dev_name = pci_name(pdev); | |
320 | mci->edac_check = r82600_check; | |
321 | mci->ctl_page_to_phys = NULL; | |
322 | r82600_init_csrows(mci, pdev, dramcr); | |
323 | r82600_get_error_info(mci, &discard); /* clear counters */ | |
324 | ||
325 | /* Here we assume that we will never see multiple instances of this | |
326 | * type of memory controller. The ID is therefore hardcoded to 0. | |
327 | */ | |
328 | if (edac_mc_add_mc(mci)) { | |
329 | edac_dbg(3, "failed edac_mc_add_mc()\n"); | |
330 | goto fail; | |
331 | } | |
332 | ||
333 | /* get this far and it's successful */ | |
334 | ||
335 | if (disable_hardware_scrub) { | |
336 | edac_dbg(3, "Disabling Hardware Scrub (scrub on error)\n"); | |
337 | pci_write_bits32(pdev, R82600_EAP, BIT(31), BIT(31)); | |
338 | } | |
339 | ||
340 | /* allocating generic PCI control info */ | |
341 | r82600_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR); | |
342 | if (!r82600_pci) { | |
343 | printk(KERN_WARNING | |
344 | "%s(): Unable to create PCI control\n", | |
345 | __func__); | |
346 | printk(KERN_WARNING | |
347 | "%s(): PCI error report via EDAC not setup\n", | |
348 | __func__); | |
349 | } | |
350 | ||
351 | edac_dbg(3, "success\n"); | |
352 | return 0; | |
353 | ||
354 | fail: | |
355 | edac_mc_free(mci); | |
356 | return -ENODEV; | |
357 | } | |
358 | ||
359 | /* returns count (>= 0), or negative on error */ | |
360 | static int r82600_init_one(struct pci_dev *pdev, | |
361 | const struct pci_device_id *ent) | |
362 | { | |
363 | edac_dbg(0, "\n"); | |
364 | ||
365 | /* don't need to call pci_enable_device() */ | |
366 | return r82600_probe1(pdev, ent->driver_data); | |
367 | } | |
368 | ||
369 | static void r82600_remove_one(struct pci_dev *pdev) | |
370 | { | |
371 | struct mem_ctl_info *mci; | |
372 | ||
373 | edac_dbg(0, "\n"); | |
374 | ||
375 | if (r82600_pci) | |
376 | edac_pci_release_generic_ctl(r82600_pci); | |
377 | ||
378 | if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) | |
379 | return; | |
380 | ||
381 | edac_mc_free(mci); | |
382 | } | |
383 | ||
384 | static const struct pci_device_id r82600_pci_tbl[] = { | |
385 | { | |
386 | PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID) | |
387 | }, | |
388 | { | |
389 | 0, | |
390 | } /* 0 terminated list. */ | |
391 | }; | |
392 | ||
393 | MODULE_DEVICE_TABLE(pci, r82600_pci_tbl); | |
394 | ||
395 | static struct pci_driver r82600_driver = { | |
396 | .name = EDAC_MOD_STR, | |
397 | .probe = r82600_init_one, | |
398 | .remove = r82600_remove_one, | |
399 | .id_table = r82600_pci_tbl, | |
400 | }; | |
401 | ||
402 | static int __init r82600_init(void) | |
403 | { | |
404 | /* Ensure that the OPSTATE is set correctly for POLL or NMI */ | |
405 | opstate_init(); | |
406 | ||
407 | return pci_register_driver(&r82600_driver); | |
408 | } | |
409 | ||
410 | static void __exit r82600_exit(void) | |
411 | { | |
412 | pci_unregister_driver(&r82600_driver); | |
413 | } | |
414 | ||
415 | module_init(r82600_init); | |
416 | module_exit(r82600_exit); | |
417 | ||
418 | MODULE_LICENSE("GPL"); | |
419 | MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. " | |
420 | "on behalf of EADS Astrium"); | |
421 | MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers"); | |
422 | ||
423 | module_param(disable_hardware_scrub, bool, 0644); | |
424 | MODULE_PARM_DESC(disable_hardware_scrub, | |
425 | "If set, disable the chipset's automatic scrub for CEs"); | |
426 | ||
427 | module_param(edac_op_state, int, 0444); | |
428 | MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI"); |