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2f768af7 AC |
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 | * http://www.radisys.com/files/support_downloads/007-01277-0002.82600DataBook.pdf | |
15 | * references to this document given in [] | |
16 | */ | |
17 | ||
2f768af7 AC |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> | |
2f768af7 AC |
20 | #include <linux/pci.h> |
21 | #include <linux/pci_ids.h> | |
2f768af7 | 22 | #include <linux/slab.h> |
2f768af7 AC |
23 | #include "edac_mc.h" |
24 | ||
929a40ec DT |
25 | #define R82600_REVISION " Ver: 2.0.1 " __DATE__ |
26 | #define EDAC_MOD_STR "r82600_edac" | |
37f04581 | 27 | |
537fba28 | 28 | #define r82600_printk(level, fmt, arg...) \ |
e7ecd891 | 29 | edac_printk(level, "r82600", fmt, ##arg) |
537fba28 DP |
30 | |
31 | #define r82600_mc_printk(mci, level, fmt, arg...) \ | |
e7ecd891 | 32 | edac_mc_chipset_printk(mci, level, "r82600", fmt, ##arg) |
537fba28 | 33 | |
2f768af7 AC |
34 | /* Radisys say "The 82600 integrates a main memory SDRAM controller that |
35 | * supports up to four banks of memory. The four banks can support a mix of | |
36 | * sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs, | |
37 | * each of which can be any size from 16MB to 512MB. Both registered (control | |
38 | * signals buffered) and unbuffered DIMM types are supported. Mixing of | |
39 | * registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs | |
40 | * is not allowed. The 82600 SDRAM interface operates at the same frequency as | |
41 | * the CPU bus, 66MHz, 100MHz or 133MHz." | |
42 | */ | |
43 | ||
44 | #define R82600_NR_CSROWS 4 | |
45 | #define R82600_NR_CHANS 1 | |
46 | #define R82600_NR_DIMMS 4 | |
47 | ||
48 | #define R82600_BRIDGE_ID 0x8200 | |
49 | ||
50 | /* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */ | |
51 | #define R82600_DRAMC 0x57 /* Various SDRAM related control bits | |
52 | * all bits are R/W | |
53 | * | |
54 | * 7 SDRAM ISA Hole Enable | |
55 | * 6 Flash Page Mode Enable | |
56 | * 5 ECC Enable: 1=ECC 0=noECC | |
57 | * 4 DRAM DIMM Type: 1= | |
58 | * 3 BIOS Alias Disable | |
59 | * 2 SDRAM BIOS Flash Write Enable | |
60 | * 1:0 SDRAM Refresh Rate: 00=Disabled | |
61 | * 01=7.8usec (256Mbit SDRAMs) | |
62 | * 10=15.6us 11=125usec | |
63 | */ | |
64 | ||
65 | #define R82600_SDRAMC 0x76 /* "SDRAM Control Register" | |
66 | * More SDRAM related control bits | |
67 | * all bits are R/W | |
68 | * | |
69 | * 15:8 Reserved. | |
70 | * | |
71 | * 7:5 Special SDRAM Mode Select | |
72 | * | |
73 | * 4 Force ECC | |
74 | * | |
75 | * 1=Drive ECC bits to 0 during | |
76 | * write cycles (i.e. ECC test mode) | |
77 | * | |
78 | * 0=Normal ECC functioning | |
79 | * | |
80 | * 3 Enhanced Paging Enable | |
81 | * | |
82 | * 2 CAS# Latency 0=3clks 1=2clks | |
83 | * | |
84 | * 1 RAS# to CAS# Delay 0=3 1=2 | |
85 | * | |
86 | * 0 RAS# Precharge 0=3 1=2 | |
87 | */ | |
88 | ||
89 | #define R82600_EAP 0x80 /* ECC Error Address Pointer Register | |
90 | * | |
91 | * 31 Disable Hardware Scrubbing (RW) | |
92 | * 0=Scrub on corrected read | |
93 | * 1=Don't scrub on corrected read | |
94 | * | |
95 | * 30:12 Error Address Pointer (RO) | |
96 | * Upper 19 bits of error address | |
97 | * | |
98 | * 11:4 Syndrome Bits (RO) | |
99 | * | |
100 | * 3 BSERR# on multibit error (RW) | |
101 | * 1=enable 0=disable | |
102 | * | |
103 | * 2 NMI on Single Bit Eror (RW) | |
104 | * 1=NMI triggered by SBE n.b. other | |
105 | * prerequeists | |
106 | * 0=NMI not triggered | |
107 | * | |
108 | * 1 MBE (R/WC) | |
109 | * read 1=MBE at EAP (see above) | |
110 | * read 0=no MBE, or SBE occurred first | |
111 | * write 1=Clear MBE status (must also | |
112 | * clear SBE) | |
113 | * write 0=NOP | |
114 | * | |
115 | * 1 SBE (R/WC) | |
116 | * read 1=SBE at EAP (see above) | |
117 | * read 0=no SBE, or MBE occurred first | |
118 | * write 1=Clear SBE status (must also | |
119 | * clear MBE) | |
120 | * write 0=NOP | |
121 | */ | |
122 | ||
123 | #define R82600_DRBA 0x60 /* + 0x60..0x63 SDRAM Row Boundry Address | |
124 | * Registers | |
125 | * | |
126 | * 7:0 Address lines 30:24 - upper limit of | |
127 | * each row [p57] | |
128 | */ | |
129 | ||
130 | struct r82600_error_info { | |
131 | u32 eapr; | |
132 | }; | |
133 | ||
2f768af7 AC |
134 | static unsigned int disable_hardware_scrub = 0; |
135 | ||
2f768af7 AC |
136 | static void r82600_get_error_info (struct mem_ctl_info *mci, |
137 | struct r82600_error_info *info) | |
138 | { | |
37f04581 DT |
139 | struct pci_dev *pdev; |
140 | ||
141 | pdev = to_pci_dev(mci->dev); | |
142 | pci_read_config_dword(pdev, R82600_EAP, &info->eapr); | |
2f768af7 AC |
143 | |
144 | if (info->eapr & BIT(0)) | |
145 | /* Clear error to allow next error to be reported [p.62] */ | |
37f04581 | 146 | pci_write_bits32(pdev, R82600_EAP, |
e7ecd891 DP |
147 | ((u32) BIT(0) & (u32) BIT(1)), |
148 | ((u32) BIT(0) & (u32) BIT(1))); | |
2f768af7 AC |
149 | |
150 | if (info->eapr & BIT(1)) | |
151 | /* Clear error to allow next error to be reported [p.62] */ | |
37f04581 | 152 | pci_write_bits32(pdev, R82600_EAP, |
e7ecd891 DP |
153 | ((u32) BIT(0) & (u32) BIT(1)), |
154 | ((u32) BIT(0) & (u32) BIT(1))); | |
2f768af7 AC |
155 | } |
156 | ||
2f768af7 AC |
157 | static int r82600_process_error_info (struct mem_ctl_info *mci, |
158 | struct r82600_error_info *info, int handle_errors) | |
159 | { | |
160 | int error_found; | |
161 | u32 eapaddr, page; | |
162 | u32 syndrome; | |
163 | ||
164 | error_found = 0; | |
165 | ||
166 | /* bits 30:12 store the upper 19 bits of the 32 bit error address */ | |
167 | eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13; | |
168 | /* Syndrome in bits 11:4 [p.62] */ | |
169 | syndrome = (info->eapr >> 4) & 0xFF; | |
170 | ||
171 | /* the R82600 reports at less than page * | |
172 | * granularity (upper 19 bits only) */ | |
173 | page = eapaddr >> PAGE_SHIFT; | |
174 | ||
e7ecd891 | 175 | if (info->eapr & BIT(0)) { /* CE? */ |
2f768af7 AC |
176 | error_found = 1; |
177 | ||
178 | if (handle_errors) | |
e7ecd891 DP |
179 | edac_mc_handle_ce(mci, page, 0, /* not avail */ |
180 | syndrome, | |
181 | edac_mc_find_csrow_by_page(mci, page), | |
182 | 0, /* channel */ | |
183 | mci->ctl_name); | |
2f768af7 AC |
184 | } |
185 | ||
e7ecd891 | 186 | if (info->eapr & BIT(1)) { /* UE? */ |
2f768af7 AC |
187 | error_found = 1; |
188 | ||
189 | if (handle_errors) | |
190 | /* 82600 doesn't give enough info */ | |
191 | edac_mc_handle_ue(mci, page, 0, | |
e7ecd891 DP |
192 | edac_mc_find_csrow_by_page(mci, page), |
193 | mci->ctl_name); | |
2f768af7 AC |
194 | } |
195 | ||
196 | return error_found; | |
197 | } | |
198 | ||
199 | static void r82600_check(struct mem_ctl_info *mci) | |
200 | { | |
201 | struct r82600_error_info info; | |
202 | ||
537fba28 | 203 | debugf1("MC%d: %s()\n", mci->mc_idx, __func__); |
2f768af7 AC |
204 | r82600_get_error_info(mci, &info); |
205 | r82600_process_error_info(mci, &info, 1); | |
206 | } | |
207 | ||
13189525 | 208 | static inline int ecc_enabled(u8 dramcr) |
2f768af7 | 209 | { |
13189525 DT |
210 | return dramcr & BIT(5); |
211 | } | |
212 | ||
213 | static void r82600_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev, | |
214 | u8 dramcr) | |
215 | { | |
216 | struct csrow_info *csrow; | |
2f768af7 | 217 | int index; |
13189525 DT |
218 | u8 drbar; /* SDRAM Row Boundry Address Register */ |
219 | u32 row_high_limit, row_high_limit_last; | |
220 | u32 reg_sdram, ecc_on, row_base; | |
221 | ||
222 | ecc_on = ecc_enabled(dramcr); | |
223 | reg_sdram = dramcr & BIT(4); | |
224 | row_high_limit_last = 0; | |
225 | ||
226 | for (index = 0; index < mci->nr_csrows; index++) { | |
227 | csrow = &mci->csrows[index]; | |
228 | ||
229 | /* find the DRAM Chip Select Base address and mask */ | |
230 | pci_read_config_byte(pdev, R82600_DRBA + index, &drbar); | |
231 | ||
232 | debugf1("%s() Row=%d DRBA = %#0x\n", __func__, index, drbar); | |
233 | ||
234 | row_high_limit = ((u32) drbar << 24); | |
235 | /* row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */ | |
236 | ||
237 | debugf1("%s() Row=%d, Boundry Address=%#0x, Last = %#0x\n", | |
238 | __func__, index, row_high_limit, row_high_limit_last); | |
239 | ||
240 | /* Empty row [p.57] */ | |
241 | if (row_high_limit == row_high_limit_last) | |
242 | continue; | |
243 | ||
244 | row_base = row_high_limit_last; | |
245 | ||
246 | csrow->first_page = row_base >> PAGE_SHIFT; | |
247 | csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1; | |
248 | csrow->nr_pages = csrow->last_page - csrow->first_page + 1; | |
249 | /* Error address is top 19 bits - so granularity is * | |
250 | * 14 bits */ | |
251 | csrow->grain = 1 << 14; | |
252 | csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR; | |
253 | /* FIXME - check that this is unknowable with this chipset */ | |
254 | csrow->dtype = DEV_UNKNOWN; | |
255 | ||
256 | /* Mode is global on 82600 */ | |
257 | csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE; | |
258 | row_high_limit_last = row_high_limit; | |
259 | } | |
260 | } | |
261 | ||
262 | static int r82600_probe1(struct pci_dev *pdev, int dev_idx) | |
263 | { | |
264 | struct mem_ctl_info *mci; | |
2f768af7 | 265 | u8 dramcr; |
2f768af7 AC |
266 | u32 eapr; |
267 | u32 scrub_disabled; | |
268 | u32 sdram_refresh_rate; | |
749ede57 | 269 | struct r82600_error_info discard; |
2f768af7 | 270 | |
537fba28 | 271 | debugf0("%s()\n", __func__); |
2f768af7 AC |
272 | pci_read_config_byte(pdev, R82600_DRAMC, &dramcr); |
273 | pci_read_config_dword(pdev, R82600_EAP, &eapr); | |
2f768af7 AC |
274 | scrub_disabled = eapr & BIT(31); |
275 | sdram_refresh_rate = dramcr & (BIT(0) | BIT(1)); | |
537fba28 DP |
276 | debugf2("%s(): sdram refresh rate = %#0x\n", __func__, |
277 | sdram_refresh_rate); | |
537fba28 | 278 | debugf2("%s(): DRAMC register = %#0x\n", __func__, dramcr); |
2f768af7 AC |
279 | mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS); |
280 | ||
13189525 DT |
281 | if (mci == NULL) |
282 | return -ENOMEM; | |
2f768af7 | 283 | |
537fba28 | 284 | debugf0("%s(): mci = %p\n", __func__, mci); |
37f04581 | 285 | mci->dev = &pdev->dev; |
2f768af7 | 286 | mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR; |
2f768af7 | 287 | mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; |
e7ecd891 DP |
288 | /* FIXME try to work out if the chip leads have been used for COM2 |
289 | * instead on this board? [MA6?] MAYBE: | |
290 | */ | |
2f768af7 AC |
291 | |
292 | /* On the R82600, the pins for memory bits 72:65 - i.e. the * | |
293 | * EC bits are shared with the pins for COM2 (!), so if COM2 * | |
294 | * is enabled, we assume COM2 is wired up, and thus no EDAC * | |
295 | * is possible. */ | |
296 | mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; | |
e7ecd891 | 297 | |
13189525 | 298 | if (ecc_enabled(dramcr)) { |
2f768af7 | 299 | if (scrub_disabled) |
537fba28 DP |
300 | debugf3("%s(): mci = %p - Scrubbing disabled! EAP: " |
301 | "%#0x\n", __func__, mci, eapr); | |
2f768af7 AC |
302 | } else |
303 | mci->edac_cap = EDAC_FLAG_NONE; | |
304 | ||
680cbbbb | 305 | mci->mod_name = EDAC_MOD_STR; |
37f04581 | 306 | mci->mod_ver = R82600_REVISION; |
2f768af7 AC |
307 | mci->ctl_name = "R82600"; |
308 | mci->edac_check = r82600_check; | |
309 | mci->ctl_page_to_phys = NULL; | |
13189525 | 310 | r82600_init_csrows(mci, pdev, dramcr); |
749ede57 | 311 | r82600_get_error_info(mci, &discard); /* clear counters */ |
2f768af7 | 312 | |
2d7bbb91 DT |
313 | /* Here we assume that we will never see multiple instances of this |
314 | * type of memory controller. The ID is therefore hardcoded to 0. | |
315 | */ | |
316 | if (edac_mc_add_mc(mci,0)) { | |
537fba28 | 317 | debugf3("%s(): failed edac_mc_add_mc()\n", __func__); |
2f768af7 AC |
318 | goto fail; |
319 | } | |
320 | ||
321 | /* get this far and it's successful */ | |
322 | ||
2f768af7 | 323 | if (disable_hardware_scrub) { |
537fba28 DP |
324 | debugf3("%s(): Disabling Hardware Scrub (scrub on error)\n", |
325 | __func__); | |
37f04581 | 326 | pci_write_bits32(pdev, R82600_EAP, BIT(31), BIT(31)); |
2f768af7 AC |
327 | } |
328 | ||
537fba28 | 329 | debugf3("%s(): success\n", __func__); |
2f768af7 AC |
330 | return 0; |
331 | ||
332 | fail: | |
13189525 DT |
333 | edac_mc_free(mci); |
334 | return -ENODEV; | |
2f768af7 AC |
335 | } |
336 | ||
337 | /* returns count (>= 0), or negative on error */ | |
338 | static int __devinit r82600_init_one(struct pci_dev *pdev, | |
e7ecd891 | 339 | const struct pci_device_id *ent) |
2f768af7 | 340 | { |
537fba28 | 341 | debugf0("%s()\n", __func__); |
2f768af7 AC |
342 | |
343 | /* don't need to call pci_device_enable() */ | |
344 | return r82600_probe1(pdev, ent->driver_data); | |
345 | } | |
346 | ||
2f768af7 AC |
347 | static void __devexit r82600_remove_one(struct pci_dev *pdev) |
348 | { | |
349 | struct mem_ctl_info *mci; | |
350 | ||
537fba28 | 351 | debugf0("%s()\n", __func__); |
2f768af7 | 352 | |
37f04581 | 353 | if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) |
18dbc337 DP |
354 | return; |
355 | ||
356 | edac_mc_free(mci); | |
2f768af7 AC |
357 | } |
358 | ||
2f768af7 | 359 | static const struct pci_device_id r82600_pci_tbl[] __devinitdata = { |
e7ecd891 DP |
360 | { |
361 | PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID) | |
362 | }, | |
363 | { | |
364 | 0, | |
365 | } /* 0 terminated list. */ | |
2f768af7 AC |
366 | }; |
367 | ||
368 | MODULE_DEVICE_TABLE(pci, r82600_pci_tbl); | |
369 | ||
2f768af7 | 370 | static struct pci_driver r82600_driver = { |
680cbbbb | 371 | .name = EDAC_MOD_STR, |
2f768af7 AC |
372 | .probe = r82600_init_one, |
373 | .remove = __devexit_p(r82600_remove_one), | |
374 | .id_table = r82600_pci_tbl, | |
375 | }; | |
376 | ||
da9bb1d2 | 377 | static int __init r82600_init(void) |
2f768af7 AC |
378 | { |
379 | return pci_register_driver(&r82600_driver); | |
380 | } | |
381 | ||
2f768af7 AC |
382 | static void __exit r82600_exit(void) |
383 | { | |
384 | pci_unregister_driver(&r82600_driver); | |
385 | } | |
386 | ||
2f768af7 AC |
387 | module_init(r82600_init); |
388 | module_exit(r82600_exit); | |
389 | ||
2f768af7 AC |
390 | MODULE_LICENSE("GPL"); |
391 | MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. " | |
e7ecd891 | 392 | "on behalf of EADS Astrium"); |
2f768af7 AC |
393 | MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers"); |
394 | ||
395 | module_param(disable_hardware_scrub, bool, 0644); | |
396 | MODULE_PARM_DESC(disable_hardware_scrub, | |
397 | "If set, disable the chipset's automatic scrub for CEs"); |