aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/edac/r82600_edac.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/edac/r82600_edac.c')
-rw-r--r--drivers/edac/r82600_edac.c407
1 files changed, 407 insertions, 0 deletions
diff --git a/drivers/edac/r82600_edac.c b/drivers/edac/r82600_edac.c
new file mode 100644
index 000000000000..b6399a542560
--- /dev/null
+++ b/drivers/edac/r82600_edac.c
@@ -0,0 +1,407 @@
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
18#include <linux/config.h>
19#include <linux/module.h>
20#include <linux/init.h>
21
22#include <linux/pci.h>
23#include <linux/pci_ids.h>
24
25#include <linux/slab.h>
26
27#include "edac_mc.h"
28
29/* Radisys say "The 82600 integrates a main memory SDRAM controller that
30 * supports up to four banks of memory. The four banks can support a mix of
31 * sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs,
32 * each of which can be any size from 16MB to 512MB. Both registered (control
33 * signals buffered) and unbuffered DIMM types are supported. Mixing of
34 * registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs
35 * is not allowed. The 82600 SDRAM interface operates at the same frequency as
36 * the CPU bus, 66MHz, 100MHz or 133MHz."
37 */
38
39#define R82600_NR_CSROWS 4
40#define R82600_NR_CHANS 1
41#define R82600_NR_DIMMS 4
42
43#define R82600_BRIDGE_ID 0x8200
44
45/* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */
46#define R82600_DRAMC 0x57 /* Various SDRAM related control bits
47 * all bits are R/W
48 *
49 * 7 SDRAM ISA Hole Enable
50 * 6 Flash Page Mode Enable
51 * 5 ECC Enable: 1=ECC 0=noECC
52 * 4 DRAM DIMM Type: 1=
53 * 3 BIOS Alias Disable
54 * 2 SDRAM BIOS Flash Write Enable
55 * 1:0 SDRAM Refresh Rate: 00=Disabled
56 * 01=7.8usec (256Mbit SDRAMs)
57 * 10=15.6us 11=125usec
58 */
59
60#define R82600_SDRAMC 0x76 /* "SDRAM Control Register"
61 * More SDRAM related control bits
62 * all bits are R/W
63 *
64 * 15:8 Reserved.
65 *
66 * 7:5 Special SDRAM Mode Select
67 *
68 * 4 Force ECC
69 *
70 * 1=Drive ECC bits to 0 during
71 * write cycles (i.e. ECC test mode)
72 *
73 * 0=Normal ECC functioning
74 *
75 * 3 Enhanced Paging Enable
76 *
77 * 2 CAS# Latency 0=3clks 1=2clks
78 *
79 * 1 RAS# to CAS# Delay 0=3 1=2
80 *
81 * 0 RAS# Precharge 0=3 1=2
82 */
83
84#define R82600_EAP 0x80 /* ECC Error Address Pointer Register
85 *
86 * 31 Disable Hardware Scrubbing (RW)
87 * 0=Scrub on corrected read
88 * 1=Don't scrub on corrected read
89 *
90 * 30:12 Error Address Pointer (RO)
91 * Upper 19 bits of error address
92 *
93 * 11:4 Syndrome Bits (RO)
94 *
95 * 3 BSERR# on multibit error (RW)
96 * 1=enable 0=disable
97 *
98 * 2 NMI on Single Bit Eror (RW)
99 * 1=NMI triggered by SBE n.b. other
100 * prerequeists
101 * 0=NMI not triggered
102 *
103 * 1 MBE (R/WC)
104 * read 1=MBE at EAP (see above)
105 * read 0=no MBE, or SBE occurred first
106 * write 1=Clear MBE status (must also
107 * clear SBE)
108 * write 0=NOP
109 *
110 * 1 SBE (R/WC)
111 * read 1=SBE at EAP (see above)
112 * read 0=no SBE, or MBE occurred first
113 * write 1=Clear SBE status (must also
114 * clear MBE)
115 * write 0=NOP
116 */
117
118#define R82600_DRBA 0x60 /* + 0x60..0x63 SDRAM Row Boundry Address
119 * Registers
120 *
121 * 7:0 Address lines 30:24 - upper limit of
122 * each row [p57]
123 */
124
125struct r82600_error_info {
126 u32 eapr;
127};
128
129
130static unsigned int disable_hardware_scrub = 0;
131
132
133static void r82600_get_error_info (struct mem_ctl_info *mci,
134 struct r82600_error_info *info)
135{
136 pci_read_config_dword(mci->pdev, R82600_EAP, &info->eapr);
137
138 if (info->eapr & BIT(0))
139 /* Clear error to allow next error to be reported [p.62] */
140 pci_write_bits32(mci->pdev, R82600_EAP,
141 ((u32) BIT(0) & (u32) BIT(1)),
142 ((u32) BIT(0) & (u32) BIT(1)));
143
144 if (info->eapr & BIT(1))
145 /* Clear error to allow next error to be reported [p.62] */
146 pci_write_bits32(mci->pdev, R82600_EAP,
147 ((u32) BIT(0) & (u32) BIT(1)),
148 ((u32) BIT(0) & (u32) BIT(1)));
149}
150
151
152static int r82600_process_error_info (struct mem_ctl_info *mci,
153 struct r82600_error_info *info, int handle_errors)
154{
155 int error_found;
156 u32 eapaddr, page;
157 u32 syndrome;
158
159 error_found = 0;
160
161 /* bits 30:12 store the upper 19 bits of the 32 bit error address */
162 eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13;
163 /* Syndrome in bits 11:4 [p.62] */
164 syndrome = (info->eapr >> 4) & 0xFF;
165
166 /* the R82600 reports at less than page *
167 * granularity (upper 19 bits only) */
168 page = eapaddr >> PAGE_SHIFT;
169
170 if (info->eapr & BIT(0)) { /* CE? */
171 error_found = 1;
172
173 if (handle_errors)
174 edac_mc_handle_ce(
175 mci, page, 0, /* not avail */
176 syndrome,
177 edac_mc_find_csrow_by_page(mci, page),
178 0, /* channel */
179 mci->ctl_name);
180 }
181
182 if (info->eapr & BIT(1)) { /* UE? */
183 error_found = 1;
184
185 if (handle_errors)
186 /* 82600 doesn't give enough info */
187 edac_mc_handle_ue(mci, page, 0,
188 edac_mc_find_csrow_by_page(mci, page),
189 mci->ctl_name);
190 }
191
192 return error_found;
193}
194
195static void r82600_check(struct mem_ctl_info *mci)
196{
197 struct r82600_error_info info;
198
199 debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
200 r82600_get_error_info(mci, &info);
201 r82600_process_error_info(mci, &info, 1);
202}
203
204static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
205{
206 int rc = -ENODEV;
207 int index;
208 struct mem_ctl_info *mci = NULL;
209 u8 dramcr;
210 u32 ecc_on;
211 u32 reg_sdram;
212 u32 eapr;
213 u32 scrub_disabled;
214 u32 sdram_refresh_rate;
215 u32 row_high_limit_last = 0;
216 u32 eap_init_bits;
217
218 debugf0("MC: " __FILE__ ": %s()\n", __func__);
219
220
221 pci_read_config_byte(pdev, R82600_DRAMC, &dramcr);
222 pci_read_config_dword(pdev, R82600_EAP, &eapr);
223
224 ecc_on = dramcr & BIT(5);
225 reg_sdram = dramcr & BIT(4);
226 scrub_disabled = eapr & BIT(31);
227 sdram_refresh_rate = dramcr & (BIT(0) | BIT(1));
228
229 debugf2("MC: " __FILE__ ": %s(): sdram refresh rate = %#0x\n",
230 __func__, sdram_refresh_rate);
231
232 debugf2("MC: " __FILE__ ": %s(): DRAMC register = %#0x\n", __func__,
233 dramcr);
234
235 mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS);
236
237 if (mci == NULL) {
238 rc = -ENOMEM;
239 goto fail;
240 }
241
242 debugf0("MC: " __FILE__ ": %s(): mci = %p\n", __func__, mci);
243
244 mci->pdev = pdev;
245 mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
246
247 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
248 /* FIXME try to work out if the chip leads have been *
249 * used for COM2 instead on this board? [MA6?] MAYBE: */
250
251 /* On the R82600, the pins for memory bits 72:65 - i.e. the *
252 * EC bits are shared with the pins for COM2 (!), so if COM2 *
253 * is enabled, we assume COM2 is wired up, and thus no EDAC *
254 * is possible. */
255 mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
256 if (ecc_on) {
257 if (scrub_disabled)
258 debugf3("MC: " __FILE__ ": %s(): mci = %p - "
259 "Scrubbing disabled! EAP: %#0x\n", __func__,
260 mci, eapr);
261 } else
262 mci->edac_cap = EDAC_FLAG_NONE;
263
264 mci->mod_name = BS_MOD_STR;
265 mci->mod_ver = "$Revision: 1.1.2.6 $";
266 mci->ctl_name = "R82600";
267 mci->edac_check = r82600_check;
268 mci->ctl_page_to_phys = NULL;
269
270 for (index = 0; index < mci->nr_csrows; index++) {
271 struct csrow_info *csrow = &mci->csrows[index];
272 u8 drbar; /* sDram Row Boundry Address Register */
273 u32 row_high_limit;
274 u32 row_base;
275
276 /* find the DRAM Chip Select Base address and mask */
277 pci_read_config_byte(mci->pdev, R82600_DRBA + index, &drbar);
278
279 debugf1("MC%d: " __FILE__ ": %s() Row=%d DRBA = %#0x\n",
280 mci->mc_idx, __func__, index, drbar);
281
282 row_high_limit = ((u32) drbar << 24);
283/* row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */
284
285 debugf1("MC%d: " __FILE__ ": %s() Row=%d, "
286 "Boundry Address=%#0x, Last = %#0x \n",
287 mci->mc_idx, __func__, index, row_high_limit,
288 row_high_limit_last);
289
290 /* Empty row [p.57] */
291 if (row_high_limit == row_high_limit_last)
292 continue;
293
294 row_base = row_high_limit_last;
295
296 csrow->first_page = row_base >> PAGE_SHIFT;
297 csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
298 csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
299 /* Error address is top 19 bits - so granularity is *
300 * 14 bits */
301 csrow->grain = 1 << 14;
302 csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
303 /* FIXME - check that this is unknowable with this chipset */
304 csrow->dtype = DEV_UNKNOWN;
305
306 /* Mode is global on 82600 */
307 csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
308 row_high_limit_last = row_high_limit;
309 }
310
311 /* clear counters */
312 /* FIXME should we? */
313
314 if (edac_mc_add_mc(mci)) {
315 debugf3("MC: " __FILE__
316 ": %s(): failed edac_mc_add_mc()\n", __func__);
317 goto fail;
318 }
319
320 /* get this far and it's successful */
321
322 /* Clear error flags to allow next error to be reported [p.62] */
323 /* Test systems seem to always have the UE flag raised on boot */
324
325 eap_init_bits = BIT(0) & BIT(1);
326 if (disable_hardware_scrub) {
327 eap_init_bits |= BIT(31);
328 debugf3("MC: " __FILE__ ": %s(): Disabling Hardware Scrub "
329 "(scrub on error)\n", __func__);
330 }
331
332 pci_write_bits32(mci->pdev, R82600_EAP, eap_init_bits,
333 eap_init_bits);
334
335 debugf3("MC: " __FILE__ ": %s(): success\n", __func__);
336 return 0;
337
338fail:
339 if (mci)
340 edac_mc_free(mci);
341
342 return rc;
343}
344
345/* returns count (>= 0), or negative on error */
346static int __devinit r82600_init_one(struct pci_dev *pdev,
347 const struct pci_device_id *ent)
348{
349 debugf0("MC: " __FILE__ ": %s()\n", __func__);
350
351 /* don't need to call pci_device_enable() */
352 return r82600_probe1(pdev, ent->driver_data);
353}
354
355
356static void __devexit r82600_remove_one(struct pci_dev *pdev)
357{
358 struct mem_ctl_info *mci;
359
360 debugf0(__FILE__ ": %s()\n", __func__);
361
362 if (((mci = edac_mc_find_mci_by_pdev(pdev)) != NULL) &&
363 !edac_mc_del_mc(mci))
364 edac_mc_free(mci);
365}
366
367
368static const struct pci_device_id r82600_pci_tbl[] __devinitdata = {
369 {PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID)},
370 {0,} /* 0 terminated list. */
371};
372
373MODULE_DEVICE_TABLE(pci, r82600_pci_tbl);
374
375
376static struct pci_driver r82600_driver = {
377 .name = BS_MOD_STR,
378 .probe = r82600_init_one,
379 .remove = __devexit_p(r82600_remove_one),
380 .id_table = r82600_pci_tbl,
381};
382
383
384int __init r82600_init(void)
385{
386 return pci_register_driver(&r82600_driver);
387}
388
389
390static void __exit r82600_exit(void)
391{
392 pci_unregister_driver(&r82600_driver);
393}
394
395
396module_init(r82600_init);
397module_exit(r82600_exit);
398
399
400MODULE_LICENSE("GPL");
401MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. "
402 "on behalf of EADS Astrium");
403MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers");
404
405module_param(disable_hardware_scrub, bool, 0644);
406MODULE_PARM_DESC(disable_hardware_scrub,
407 "If set, disable the chipset's automatic scrub for CEs");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-23 05:58:39 -0500