2 * Intel 82443BX/GX (440BX/GX chipset) Memory Controller EDAC kernel
3 * module (C) 2006 Tim Small
5 * This file may be distributed under the terms of the GNU General
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
12 * 440GX fix by Jason Uhlenkott <juhlenko@akamai.com>.
14 * Written with reference to 82443BX Host Bridge Datasheet:
15 * http://www.intel.com/design/chipsets/440/documentation.htm
16 * references to this document given in [].
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).
24 #include <linux/module.h>
25 #include <linux/init.h>
27 #include <linux/pci.h>
28 #include <linux/pci_ids.h>
30 #include <linux/slab.h>
32 #include "edac_core.h"
34 #define I82443_REVISION "0.1"
36 #define EDAC_MOD_STR "i82443bxgx_edac"
38 /* The 82443BX supports SDRAM, or EDO (EDO for mobile only), "Memory
39 * Size: 8 MB to 512 MB (1GB with Registered DIMMs) with eight memory
40 * rows" "The 82443BX supports multiple-bit error detection and
41 * single-bit error correction when ECC mode is enabled and
42 * single/multi-bit error detection when correction is disabled.
43 * During writes to the DRAM, the 82443BX generates ECC for the data
44 * on a QWord basis. Partial QWord writes require a read-modify-write
45 * cycle when ECC is enabled."
48 /* "Additionally, the 82443BX ensures that the data is corrected in
49 * main memory so that accumulation of errors is prevented. Another
50 * error within the same QWord would result in a double-bit error
51 * which is unrecoverable. This is known as hardware scrubbing since
52 * it requires no software intervention to correct the data in memory."
55 /* [Also see page 100 (section 4.3), "DRAM Interface"]
56 * [Also see page 112 (section 4.6.1.4), ECC]
59 #define I82443BXGX_NR_CSROWS 8
60 #define I82443BXGX_NR_CHANS 1
61 #define I82443BXGX_NR_DIMMS 4
63 /* 82443 PCI Device 0 */
64 #define I82443BXGX_NBXCFG 0x50 /* 32bit register starting at this PCI
65 * config space offset */
66 #define I82443BXGX_NBXCFG_OFFSET_NON_ECCROW 24 /* Array of bits, zero if
68 #define I82443BXGX_NBXCFG_OFFSET_DRAM_FREQ 12 /* 2 bits,00=100MHz,10=66 MHz */
70 #define I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY 7 /* 2 bits: */
71 #define I82443BXGX_NBXCFG_INTEGRITY_NONE 0x0 /* 00 = Non-ECC */
72 #define I82443BXGX_NBXCFG_INTEGRITY_EC 0x1 /* 01 = EC (only) */
73 #define I82443BXGX_NBXCFG_INTEGRITY_ECC 0x2 /* 10 = ECC */
74 #define I82443BXGX_NBXCFG_INTEGRITY_SCRUB 0x3 /* 11 = ECC + HW Scrub */
76 #define I82443BXGX_NBXCFG_OFFSET_ECC_DIAG_ENABLE 6
78 /* 82443 PCI Device 0 */
79 #define I82443BXGX_EAP 0x80 /* 32bit register starting at this PCI
80 * config space offset, Error Address
82 #define I82443BXGX_EAP_OFFSET_EAP 12 /* High 20 bits of error address */
83 #define I82443BXGX_EAP_OFFSET_MBE BIT(1) /* Err at EAP was multi-bit (W1TC) */
84 #define I82443BXGX_EAP_OFFSET_SBE BIT(0) /* Err at EAP was single-bit (W1TC) */
86 #define I82443BXGX_ERRCMD 0x90 /* 8bit register starting at this PCI
87 * config space offset. */
88 #define I82443BXGX_ERRCMD_OFFSET_SERR_ON_MBE BIT(1) /* 1 = enable */
89 #define I82443BXGX_ERRCMD_OFFSET_SERR_ON_SBE BIT(0) /* 1 = enable */
91 #define I82443BXGX_ERRSTS 0x91 /* 16bit register starting at this PCI
92 * config space offset. */
93 #define I82443BXGX_ERRSTS_OFFSET_MBFRE 5 /* 3 bits - first err row multibit */
94 #define I82443BXGX_ERRSTS_OFFSET_MEF BIT(4) /* 1 = MBE occurred */
95 #define I82443BXGX_ERRSTS_OFFSET_SBFRE 1 /* 3 bits - first err row singlebit */
96 #define I82443BXGX_ERRSTS_OFFSET_SEF BIT(0) /* 1 = SBE occurred */
98 #define I82443BXGX_DRAMC 0x57 /* 8bit register starting at this PCI
99 * config space offset. */
100 #define I82443BXGX_DRAMC_OFFSET_DT 3 /* 2 bits, DRAM Type */
101 #define I82443BXGX_DRAMC_DRAM_IS_EDO 0 /* 00 = EDO */
102 #define I82443BXGX_DRAMC_DRAM_IS_SDRAM 1 /* 01 = SDRAM */
103 #define I82443BXGX_DRAMC_DRAM_IS_RSDRAM 2 /* 10 = Registered SDRAM */
105 #define I82443BXGX_DRB 0x60 /* 8x 8bit registers starting at this PCI
106 * config space offset. */
108 /* FIXME - don't poll when ECC disabled? */
110 struct i82443bxgx_edacmc_error_info {
114 static struct edac_pci_ctl_info *i82443bxgx_pci;
116 static void i82443bxgx_edacmc_get_error_info(struct mem_ctl_info *mci,
117 struct i82443bxgx_edacmc_error_info
120 struct pci_dev *pdev;
121 pdev = to_pci_dev(mci->dev);
122 pci_read_config_dword(pdev, I82443BXGX_EAP, &info->eap);
123 if (info->eap & I82443BXGX_EAP_OFFSET_SBE)
124 /* Clear error to allow next error to be reported [p.61] */
125 pci_write_bits32(pdev, I82443BXGX_EAP,
126 I82443BXGX_EAP_OFFSET_SBE,
127 I82443BXGX_EAP_OFFSET_SBE);
129 if (info->eap & I82443BXGX_EAP_OFFSET_MBE)
130 /* Clear error to allow next error to be reported [p.61] */
131 pci_write_bits32(pdev, I82443BXGX_EAP,
132 I82443BXGX_EAP_OFFSET_MBE,
133 I82443BXGX_EAP_OFFSET_MBE);
136 static int i82443bxgx_edacmc_process_error_info(struct mem_ctl_info *mci,
138 i82443bxgx_edacmc_error_info
139 *info, int handle_errors)
142 u32 eapaddr, page, pageoffset;
144 /* bits 30:12 hold the 4kb block in which the error occurred
146 eapaddr = (info->eap & 0xfffff000);
147 page = eapaddr >> PAGE_SHIFT;
148 pageoffset = eapaddr - (page << PAGE_SHIFT);
150 if (info->eap & I82443BXGX_EAP_OFFSET_SBE) {
153 edac_mc_handle_ce(mci, page, pageoffset,
154 /* 440BX/GX don't make syndrome information
156 0, edac_mc_find_csrow_by_page(mci, page), 0,
160 if (info->eap & I82443BXGX_EAP_OFFSET_MBE) {
163 edac_mc_handle_ue(mci, page, pageoffset,
164 edac_mc_find_csrow_by_page(mci, page),
171 static void i82443bxgx_edacmc_check(struct mem_ctl_info *mci)
173 struct i82443bxgx_edacmc_error_info info;
175 debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
176 i82443bxgx_edacmc_get_error_info(mci, &info);
177 i82443bxgx_edacmc_process_error_info(mci, &info, 1);
180 static void i82443bxgx_init_csrows(struct mem_ctl_info *mci,
181 struct pci_dev *pdev,
182 enum edac_type edac_mode,
185 struct csrow_info *csrow;
188 u32 row_base, row_high_limit, row_high_limit_last;
190 pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
191 row_high_limit_last = 0;
192 for (index = 0; index < mci->nr_csrows; index++) {
193 csrow = &mci->csrows[index];
194 pci_read_config_byte(pdev, I82443BXGX_DRB + index, &drbar);
195 debugf1("MC%d: " __FILE__ ": %s() Row=%d DRB = %#0x\n",
196 mci->mc_idx, __func__, index, drbar);
197 row_high_limit = ((u32) drbar << 23);
198 /* find the DRAM Chip Select Base address and mask */
199 debugf1("MC%d: " __FILE__ ": %s() Row=%d, "
200 "Boundry Address=%#0x, Last = %#0x \n",
201 mci->mc_idx, __func__, index, row_high_limit,
202 row_high_limit_last);
204 /* 440GX goes to 2GB, represented with a DRB of 0. */
205 if (row_high_limit_last && !row_high_limit)
206 row_high_limit = 1UL << 31;
208 /* This row is empty [p.49] */
209 if (row_high_limit == row_high_limit_last)
211 row_base = row_high_limit_last;
212 csrow->first_page = row_base >> PAGE_SHIFT;
213 csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
214 csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
215 /* EAP reports in 4kilobyte granularity [61] */
216 csrow->grain = 1 << 12;
217 csrow->mtype = mtype;
218 /* I don't think 440BX can tell you device type? FIXME? */
219 csrow->dtype = DEV_UNKNOWN;
220 /* Mode is global to all rows on 440BX */
221 csrow->edac_mode = edac_mode;
222 row_high_limit_last = row_high_limit;
226 static int i82443bxgx_edacmc_probe1(struct pci_dev *pdev, int dev_idx)
228 struct mem_ctl_info *mci;
230 u32 nbxcfg, ecc_mode;
232 enum edac_type edac_mode;
234 debugf0("MC: " __FILE__ ": %s()\n", __func__);
236 /* Something is really hosed if PCI config space reads from
237 * the MC aren't working.
239 if (pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg))
242 mci = edac_mc_alloc(0, I82443BXGX_NR_CSROWS, I82443BXGX_NR_CHANS, 0);
247 debugf0("MC: " __FILE__ ": %s(): mci = %p\n", __func__, mci);
248 mci->dev = &pdev->dev;
249 mci->mtype_cap = MEM_FLAG_EDO | MEM_FLAG_SDR | MEM_FLAG_RDR;
250 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
251 pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
252 switch ((dramc >> I82443BXGX_DRAMC_OFFSET_DT) & (BIT(0) | BIT(1))) {
253 case I82443BXGX_DRAMC_DRAM_IS_EDO:
256 case I82443BXGX_DRAMC_DRAM_IS_SDRAM:
259 case I82443BXGX_DRAMC_DRAM_IS_RSDRAM:
263 debugf0("Unknown/reserved DRAM type value "
264 "in DRAMC register!\n");
265 mtype = -MEM_UNKNOWN;
268 if ((mtype == MEM_SDR) || (mtype == MEM_RDR))
269 mci->edac_cap = mci->edac_ctl_cap;
271 mci->edac_cap = EDAC_FLAG_NONE;
273 mci->scrub_cap = SCRUB_FLAG_HW_SRC;
274 pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg);
275 ecc_mode = ((nbxcfg >> I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY) &
278 mci->scrub_mode = (ecc_mode == I82443BXGX_NBXCFG_INTEGRITY_SCRUB)
279 ? SCRUB_HW_SRC : SCRUB_NONE;
282 case I82443BXGX_NBXCFG_INTEGRITY_NONE:
283 edac_mode = EDAC_NONE;
285 case I82443BXGX_NBXCFG_INTEGRITY_EC:
288 case I82443BXGX_NBXCFG_INTEGRITY_ECC:
289 case I82443BXGX_NBXCFG_INTEGRITY_SCRUB:
290 edac_mode = EDAC_SECDED;
293 debugf0("%s(): Unknown/reserved ECC state "
294 "in NBXCFG register!\n", __func__);
295 edac_mode = EDAC_UNKNOWN;
299 i82443bxgx_init_csrows(mci, pdev, edac_mode, mtype);
301 /* Many BIOSes don't clear error flags on boot, so do this
302 * here, or we get "phantom" errors occuring at module-load
304 pci_write_bits32(pdev, I82443BXGX_EAP,
305 (I82443BXGX_EAP_OFFSET_SBE |
306 I82443BXGX_EAP_OFFSET_MBE),
307 (I82443BXGX_EAP_OFFSET_SBE |
308 I82443BXGX_EAP_OFFSET_MBE));
310 mci->mod_name = EDAC_MOD_STR;
311 mci->mod_ver = I82443_REVISION;
312 mci->ctl_name = "I82443BXGX";
313 mci->dev_name = pci_name(pdev);
314 mci->edac_check = i82443bxgx_edacmc_check;
315 mci->ctl_page_to_phys = NULL;
317 if (edac_mc_add_mc(mci)) {
318 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
322 /* allocating generic PCI control info */
323 i82443bxgx_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
324 if (!i82443bxgx_pci) {
326 "%s(): Unable to create PCI control\n",
329 "%s(): PCI error report via EDAC not setup\n",
333 debugf3("MC: " __FILE__ ": %s(): success\n", __func__);
341 EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_probe1);
343 /* returns count (>= 0), or negative on error */
344 static int __devinit i82443bxgx_edacmc_init_one(struct pci_dev *pdev,
345 const struct pci_device_id *ent)
347 debugf0("MC: " __FILE__ ": %s()\n", __func__);
349 /* don't need to call pci_device_enable() */
350 return i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
353 static void __devexit i82443bxgx_edacmc_remove_one(struct pci_dev *pdev)
355 struct mem_ctl_info *mci;
357 debugf0(__FILE__ ": %s()\n", __func__);
360 edac_pci_release_generic_ctl(i82443bxgx_pci);
362 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
368 EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_remove_one);
370 static const struct pci_device_id i82443bxgx_pci_tbl[] __devinitdata = {
371 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_0)},
372 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_2)},
373 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0)},
374 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2)},
375 {0,} /* 0 terminated list. */
378 MODULE_DEVICE_TABLE(pci, i82443bxgx_pci_tbl);
380 static struct pci_driver i82443bxgx_edacmc_driver = {
381 .name = EDAC_MOD_STR,
382 .probe = i82443bxgx_edacmc_init_one,
383 .remove = __devexit_p(i82443bxgx_edacmc_remove_one),
384 .id_table = i82443bxgx_pci_tbl,
387 static int __init i82443bxgx_edacmc_init(void)
389 return pci_register_driver(&i82443bxgx_edacmc_driver);
392 static void __exit i82443bxgx_edacmc_exit(void)
394 pci_unregister_driver(&i82443bxgx_edacmc_driver);
397 module_init(i82443bxgx_edacmc_init);
398 module_exit(i82443bxgx_edacmc_exit);
400 MODULE_LICENSE("GPL");
401 MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD");
402 MODULE_DESCRIPTION("EDAC MC support for Intel 82443BX/GX memory controllers");