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.
7 * Written by Tim Small <tim@buttersideup.com>, based on work by Thayne
8 * Harbaugh, Dan Hollis <goemon at anime dot net> and others.
10 * $Id: edac_r82600.c,v 1.1.2.6 2005/10/05 00:43:44 dsp_llnl Exp $
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 []
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/pci.h>
21 #include <linux/pci_ids.h>
22 #include <linux/slab.h>
25 #define r82600_printk(level, fmt, arg...) \
26 edac_printk(level, "r82600", fmt, ##arg)
28 #define r82600_mc_printk(mci, level, fmt, arg...) \
29 edac_mc_chipset_printk(mci, level, "r82600", fmt, ##arg)
31 /* Radisys say "The 82600 integrates a main memory SDRAM controller that
32 * supports up to four banks of memory. The four banks can support a mix of
33 * sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs,
34 * each of which can be any size from 16MB to 512MB. Both registered (control
35 * signals buffered) and unbuffered DIMM types are supported. Mixing of
36 * registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs
37 * is not allowed. The 82600 SDRAM interface operates at the same frequency as
38 * the CPU bus, 66MHz, 100MHz or 133MHz."
41 #define R82600_NR_CSROWS 4
42 #define R82600_NR_CHANS 1
43 #define R82600_NR_DIMMS 4
45 #define R82600_BRIDGE_ID 0x8200
47 /* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */
48 #define R82600_DRAMC 0x57 /* Various SDRAM related control bits
51 * 7 SDRAM ISA Hole Enable
52 * 6 Flash Page Mode Enable
53 * 5 ECC Enable: 1=ECC 0=noECC
54 * 4 DRAM DIMM Type: 1=
55 * 3 BIOS Alias Disable
56 * 2 SDRAM BIOS Flash Write Enable
57 * 1:0 SDRAM Refresh Rate: 00=Disabled
58 * 01=7.8usec (256Mbit SDRAMs)
59 * 10=15.6us 11=125usec
62 #define R82600_SDRAMC 0x76 /* "SDRAM Control Register"
63 * More SDRAM related control bits
68 * 7:5 Special SDRAM Mode Select
72 * 1=Drive ECC bits to 0 during
73 * write cycles (i.e. ECC test mode)
75 * 0=Normal ECC functioning
77 * 3 Enhanced Paging Enable
79 * 2 CAS# Latency 0=3clks 1=2clks
81 * 1 RAS# to CAS# Delay 0=3 1=2
83 * 0 RAS# Precharge 0=3 1=2
86 #define R82600_EAP 0x80 /* ECC Error Address Pointer Register
88 * 31 Disable Hardware Scrubbing (RW)
89 * 0=Scrub on corrected read
90 * 1=Don't scrub on corrected read
92 * 30:12 Error Address Pointer (RO)
93 * Upper 19 bits of error address
95 * 11:4 Syndrome Bits (RO)
97 * 3 BSERR# on multibit error (RW)
100 * 2 NMI on Single Bit Eror (RW)
101 * 1=NMI triggered by SBE n.b. other
103 * 0=NMI not triggered
106 * read 1=MBE at EAP (see above)
107 * read 0=no MBE, or SBE occurred first
108 * write 1=Clear MBE status (must also
113 * read 1=SBE at EAP (see above)
114 * read 0=no SBE, or MBE occurred first
115 * write 1=Clear SBE status (must also
120 #define R82600_DRBA 0x60 /* + 0x60..0x63 SDRAM Row Boundry Address
123 * 7:0 Address lines 30:24 - upper limit of
127 struct r82600_error_info {
131 static unsigned int disable_hardware_scrub = 0;
133 static void r82600_get_error_info (struct mem_ctl_info *mci,
134 struct r82600_error_info *info)
136 pci_read_config_dword(mci->pdev, R82600_EAP, &info->eapr);
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)));
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)));
151 static int r82600_process_error_info (struct mem_ctl_info *mci,
152 struct r82600_error_info *info, int handle_errors)
160 /* bits 30:12 store the upper 19 bits of the 32 bit error address */
161 eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13;
162 /* Syndrome in bits 11:4 [p.62] */
163 syndrome = (info->eapr >> 4) & 0xFF;
165 /* the R82600 reports at less than page *
166 * granularity (upper 19 bits only) */
167 page = eapaddr >> PAGE_SHIFT;
169 if (info->eapr & BIT(0)) { /* CE? */
173 edac_mc_handle_ce(mci, page, 0, /* not avail */
175 edac_mc_find_csrow_by_page(mci, page),
180 if (info->eapr & BIT(1)) { /* UE? */
184 /* 82600 doesn't give enough info */
185 edac_mc_handle_ue(mci, page, 0,
186 edac_mc_find_csrow_by_page(mci, page),
193 static void r82600_check(struct mem_ctl_info *mci)
195 struct r82600_error_info info;
197 debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
198 r82600_get_error_info(mci, &info);
199 r82600_process_error_info(mci, &info, 1);
202 static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
206 struct mem_ctl_info *mci = NULL;
212 u32 sdram_refresh_rate;
213 u32 row_high_limit_last = 0;
214 struct r82600_error_info discard;
216 debugf0("%s()\n", __func__);
217 pci_read_config_byte(pdev, R82600_DRAMC, &dramcr);
218 pci_read_config_dword(pdev, R82600_EAP, &eapr);
219 ecc_on = dramcr & BIT(5);
220 reg_sdram = dramcr & BIT(4);
221 scrub_disabled = eapr & BIT(31);
222 sdram_refresh_rate = dramcr & (BIT(0) | BIT(1));
223 debugf2("%s(): sdram refresh rate = %#0x\n", __func__,
225 debugf2("%s(): DRAMC register = %#0x\n", __func__, dramcr);
226 mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS);
233 debugf0("%s(): mci = %p\n", __func__, mci);
235 mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
236 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
237 /* FIXME try to work out if the chip leads have been used for COM2
238 * instead on this board? [MA6?] MAYBE:
241 /* On the R82600, the pins for memory bits 72:65 - i.e. the *
242 * EC bits are shared with the pins for COM2 (!), so if COM2 *
243 * is enabled, we assume COM2 is wired up, and thus no EDAC *
245 mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
249 debugf3("%s(): mci = %p - Scrubbing disabled! EAP: "
250 "%#0x\n", __func__, mci, eapr);
252 mci->edac_cap = EDAC_FLAG_NONE;
254 mci->mod_name = EDAC_MOD_STR;
255 mci->mod_ver = "$Revision: 1.1.2.6 $";
256 mci->ctl_name = "R82600";
257 mci->edac_check = r82600_check;
258 mci->ctl_page_to_phys = NULL;
260 for (index = 0; index < mci->nr_csrows; index++) {
261 struct csrow_info *csrow = &mci->csrows[index];
262 u8 drbar; /* sDram Row Boundry Address Register */
266 /* find the DRAM Chip Select Base address and mask */
267 pci_read_config_byte(mci->pdev, R82600_DRBA + index, &drbar);
269 debugf1("MC%d: %s() Row=%d DRBA = %#0x\n", mci->mc_idx,
270 __func__, index, drbar);
272 row_high_limit = ((u32) drbar << 24);
273 /* row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */
275 debugf1("MC%d: %s() Row=%d, Boundry Address=%#0x, Last = "
276 "%#0x \n", mci->mc_idx, __func__, index,
277 row_high_limit, row_high_limit_last);
279 /* Empty row [p.57] */
280 if (row_high_limit == row_high_limit_last)
283 row_base = row_high_limit_last;
284 csrow->first_page = row_base >> PAGE_SHIFT;
285 csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
286 csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
287 /* Error address is top 19 bits - so granularity is *
289 csrow->grain = 1 << 14;
290 csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
291 /* FIXME - check that this is unknowable with this chipset */
292 csrow->dtype = DEV_UNKNOWN;
294 /* Mode is global on 82600 */
295 csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
296 row_high_limit_last = row_high_limit;
299 r82600_get_error_info(mci, &discard); /* clear counters */
301 if (edac_mc_add_mc(mci)) {
302 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
306 /* get this far and it's successful */
308 if (disable_hardware_scrub) {
309 debugf3("%s(): Disabling Hardware Scrub (scrub on error)\n",
311 pci_write_bits32(mci->pdev, R82600_EAP, BIT(31), BIT(31));
314 debugf3("%s(): success\n", __func__);
324 /* returns count (>= 0), or negative on error */
325 static int __devinit r82600_init_one(struct pci_dev *pdev,
326 const struct pci_device_id *ent)
328 debugf0("%s()\n", __func__);
330 /* don't need to call pci_device_enable() */
331 return r82600_probe1(pdev, ent->driver_data);
334 static void __devexit r82600_remove_one(struct pci_dev *pdev)
336 struct mem_ctl_info *mci;
338 debugf0("%s()\n", __func__);
340 if ((mci = edac_mc_del_mc(pdev)) == NULL)
346 static const struct pci_device_id r82600_pci_tbl[] __devinitdata = {
348 PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID)
352 } /* 0 terminated list. */
355 MODULE_DEVICE_TABLE(pci, r82600_pci_tbl);
357 static struct pci_driver r82600_driver = {
358 .name = EDAC_MOD_STR,
359 .probe = r82600_init_one,
360 .remove = __devexit_p(r82600_remove_one),
361 .id_table = r82600_pci_tbl,
364 static int __init r82600_init(void)
366 return pci_register_driver(&r82600_driver);
369 static void __exit r82600_exit(void)
371 pci_unregister_driver(&r82600_driver);
374 module_init(r82600_init);
375 module_exit(r82600_exit);
377 MODULE_LICENSE("GPL");
378 MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. "
379 "on behalf of EADS Astrium");
380 MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers");
382 module_param(disable_hardware_scrub, bool, 0644);
383 MODULE_PARM_DESC(disable_hardware_scrub,
384 "If set, disable the chipset's automatic scrub for CEs");