/* * Intel 82975X Memory Controller kernel module * (C) 2007 aCarLab (India) Pvt. Ltd. (http://acarlab.com) * (C) 2007 jetzbroadband (http://jetzbroadband.com) * This file may be distributed under the terms of the * GNU General Public License. * * Written by Arvind R. * Copied from i82875p_edac.c source: */ #include <linux/module.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/pci_ids.h> #include <linux/slab.h> #include "edac_core.h" #define I82975X_REVISION " Ver: 1.0.0 " __DATE__ #define EDAC_MOD_STR "i82975x_edac" #define i82975x_printk(level, fmt, arg...) \ edac_printk(level, "i82975x", fmt, ##arg) #define i82975x_mc_printk(mci, level, fmt, arg...) \ edac_mc_chipset_printk(mci, level, "i82975x", fmt, ##arg) #ifndef PCI_DEVICE_ID_INTEL_82975_0 #define PCI_DEVICE_ID_INTEL_82975_0 0x277c #endif /* PCI_DEVICE_ID_INTEL_82975_0 */ #define I82975X_NR_CSROWS(nr_chans) (8/(nr_chans)) /* Intel 82975X register addresses - device 0 function 0 - DRAM Controller */ #define I82975X_EAP 0x58 /* Dram Error Address Pointer (32b) * * 31:7 128 byte cache-line address * 6:1 reserved * 0 0: CH0; 1: CH1 */ #define I82975X_DERRSYN 0x5c /* Dram Error SYNdrome (8b) * * 7:0 DRAM ECC Syndrome */ #define I82975X_DES 0x5d /* Dram ERRor DeSTination (8b) * 0h: Processor Memory Reads * 1h:7h reserved * More - See Page 65 of Intel DocSheet. */ #define I82975X_ERRSTS 0xc8 /* Error Status Register (16b) * * 15:12 reserved * 11 Thermal Sensor Event * 10 reserved * 9 non-DRAM lock error (ndlock) * 8 Refresh Timeout * 7:2 reserved * 1 ECC UE (multibit DRAM error) * 0 ECC CE (singlebit DRAM error) */ /* Error Reporting is supported by 3 mechanisms: 1. DMI SERR generation ( ERRCMD ) 2. SMI DMI generation ( SMICMD ) 3. SCI DMI generation ( SCICMD ) NOTE: Only ONE of the three must be enabled */ #define I82975X_ERRCMD 0xca /* Error Command (16b) * * 15:12 reserved * 11 Thermal Sensor Event * 10 reserved * 9 non-DRAM lock error (ndlock) * 8 Refresh Timeout * 7:2 reserved * 1 ECC UE (multibit DRAM error) * 0 ECC CE (singlebit DRAM error) */ #define I82975X_SMICMD 0xcc /* Error Command (16b) * * 15:2 reserved * 1 ECC UE (multibit DRAM error) * 0 ECC CE (singlebit DRAM error) */ #define I82975X_SCICMD 0xce /* Error Command (16b) * * 15:2 reserved * 1 ECC UE (multibit DRAM error) * 0 ECC CE (singlebit DRAM error) */ #define I82975X_XEAP 0xfc /* Extended Dram Error Address Pointer (8b) * * 7:1 reserved * 0 Bit32 of the Dram Error Address */ #define I82975X_MCHBAR 0x44 /* * * 31:14 Base Addr of 16K memory-mapped * configuration space * 13:1 reserverd * 0 mem-mapped config space enable */ /* NOTE: Following addresses have to indexed using MCHBAR offset (44h, 32b) */ /* Intel 82975x memory mapped register space */ #define I82975X_DRB_SHIFT 25 /* fixed 32MiB grain */ #define I82975X_DRB 0x100 /* DRAM Row Boundary (8b x 8) * * 7 set to 1 in highest DRB of * channel if 4GB in ch. * 6:2 upper boundary of rank in * 32MB grains * 1:0 set to 0 */ #define I82975X_DRB_CH0R0 0x100 #define I82975X_DRB_CH0R1 0x101 #define I82975X_DRB_CH0R2 0x102 #define I82975X_DRB_CH0R3 0x103 #define I82975X_DRB_CH1R0 0x180 #define I82975X_DRB_CH1R1 0x181 #define I82975X_DRB_CH1R2 0x182 #define I82975X_DRB_CH1R3 0x183 #define I82975X_DRA 0x108 /* DRAM Row Attribute (4b x 8) * defines the PAGE SIZE to be used * for the rank * 7 reserved * 6:4 row attr of odd rank, i.e. 1 * 3 reserved * 2:0 row attr of even rank, i.e. 0 * * 000 = unpopulated * 001 = reserved * 010 = 4KiB * 011 = 8KiB * 100 = 16KiB * others = reserved */ #define I82975X_DRA_CH0R01 0x108 #define I82975X_DRA_CH0R23 0x109 #define I82975X_DRA_CH1R01 0x188 #define I82975X_DRA_CH1R23 0x189 #define I82975X_BNKARC 0x10e /* Type of device in each rank - Bank Arch (16b) * * 15:8 reserved * 7:6 Rank 3 architecture * 5:4 Rank 2 architecture * 3:2 Rank 1 architecture * 1:0 Rank 0 architecture * * 00 => x16 devices; i.e 4 banks * 01 => x8 devices; i.e 8 banks */ #define I82975X_C0BNKARC 0x10e #define I82975X_C1BNKARC 0x18e #define I82975X_DRC 0x120 /* DRAM Controller Mode0 (32b) * * 31:30 reserved * 29 init complete * 28:11 reserved, according to Intel * 22:21 number of channels * 00=1 01=2 in 82875 * seems to be ECC mode * bits in 82975 in Asus * P5W * 19:18 Data Integ Mode * 00=none 01=ECC in 82875 * 10:8 refresh mode * 7 reserved * 6:4 mode select * 3:2 reserved * 1:0 DRAM type 10=Second Revision * DDR2 SDRAM * 00, 01, 11 reserved */ #define I82975X_DRC_CH0M0 0x120 #define I82975X_DRC_CH1M0 0x1A0 #define I82975X_DRC_M1 0x124 /* DRAM Controller Mode1 (32b) * 31 0=Standard Address Map * 1=Enhanced Address Map * 30:0 reserved */ #define I82975X_DRC_CH0M1 0x124 #define I82975X_DRC_CH1M1 0x1A4 enum i82975x_chips { I82975X = 0, }; struct i82975x_pvt { void __iomem *mch_window; }; struct i82975x_dev_info { const char *ctl_name; }; struct i82975x_error_info { u16 errsts; u32 eap; u8 des; u8 derrsyn; u16 errsts2; u8 chan; /* the channel is bit 0 of EAP */ u8 xeap; /* extended eap bit */ }; static const struct i82975x_dev_info i82975x_devs[] = { [I82975X] = { .ctl_name = "i82975x" }, }; static struct pci_dev *mci_pdev; /* init dev: in case that AGP code has * already registered driver */ static int i82975x_registered = 1; static void i82975x_get_error_info(struct mem_ctl_info *mci, struct i82975x_error_info *info) { struct pci_dev *pdev; pdev = to_pci_dev(mci->dev); /* * This is a mess because there is no atomic way to read all the * registers at once and the registers can transition from CE being * overwritten by UE. */ pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts); pci_read_config_dword(pdev, I82975X_EAP, &info->eap); pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap); pci_read_config_byte(pdev, I82975X_DES, &info->des); pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn); pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts2); pci_write_bits16(pdev, I82975X_ERRSTS, 0x0003, 0x0003); /* * If the error is the same then we can for both reads then * the first set of reads is valid. If there is a change then * there is a CE no info and the second set of reads is valid * and should be UE info. */ if (!(info->errsts2 & 0x0003)) return; if ((info->errsts ^ info->errsts2) & 0x0003) { pci_read_config_dword(pdev, I82975X_EAP, &info->eap); pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap); pci_read_config_byte(pdev, I82975X_DES, &info->des); pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn); } } static int i82975x_process_error_info(struct mem_ctl_info *mci, struct i82975x_error_info *info, int handle_errors) { int row, multi_chan, chan; multi_chan = mci->csrows[0].nr_channels - 1; if (!(info->errsts2 & 0x0003)) return 0; if (!handle_errors) return 1; if ((info->errsts ^ info->errsts2) & 0x0003) { edac_mc_handle_ce_no_info(mci, "UE overwrote CE"); info->errsts = info->errsts2; } chan = info->eap & 1; info->eap >>= 1; if (info->xeap ) info->eap |= 0x80000000; info->eap >>= PAGE_SHIFT; row = edac_mc_find_csrow_by_page(mci, info->eap); if (info->errsts & 0x0002) edac_mc_handle_ue(mci, info->eap, 0, row, "i82975x UE"); else edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row, multi_chan ? chan : 0, "i82975x CE"); return 1; } static void i82975x_check(struct mem_ctl_info *mci) { struct i82975x_error_info info; debugf1("MC%d: %s()\n", mci->mc_idx, __func__); i82975x_get_error_info(mci, &info); i82975x_process_error_info(mci, &info, 1); } /* Return 1 if dual channel mode is active. Else return 0. */ static int dual_channel_active(void __iomem *mch_window) { /* * We treat interleaved-symmetric configuration as dual-channel - EAP's * bit-0 giving the channel of the error location. * * All other configurations are treated as single channel - the EAP's * bit-0 will resolve ok in symmetric area of mixed * (symmetric/asymmetric) configurations */ u8 drb[4][2]; int row; int dualch; for (dualch = 1, row = 0; dualch && (row < 4); row++) { drb[row][0] = readb(mch_window + I82975X_DRB + row); drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80); dualch = dualch && (drb[row][0] == drb[row][1]); } return dualch; } static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank) { /* * ASUS P5W DH either does not program this register or programs * it wrong! * ECC is possible on i92975x ONLY with DEV_X8 which should mean 'val' * for each rank should be 01b - the LSB of the word should be 0x55; * but it reads 0! */ return DEV_X8; } static void i82975x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev, void __iomem *mch_window) { struct csrow_info *csrow; unsigned long last_cumul_size; u8 value; u32 cumul_size; int index; last_cumul_size = 0; /* * 82875 comment: * The dram row boundary (DRB) reg values are boundary address * for each DRAM row with a granularity of 32 or 64MB (single/dual * channel operation). DRB regs are cumulative; therefore DRB7 will * contain the total memory contained in all eight rows. * * FIXME: * EDAC currently works for Dual-channel Interleaved configuration. * Other configurations, which the chip supports, need fixing/testing. * */ for (index = 0; index < mci->nr_csrows; index++) { csrow = &mci->csrows[index]; value = readb(mch_window + I82975X_DRB + index + ((index >= 4) ? 0x80 : 0)); cumul_size = value; cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT); debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index, cumul_size); if (cumul_size == last_cumul_size) continue; /* not populated */ csrow->first_page = last_cumul_size; csrow->last_page = cumul_size - 1; csrow->nr_pages = cumul_size - last_cumul_size; last_cumul_size = cumul_size; csrow->grain = 1 << 7; /* I82975X_EAP has 128B resolution */ csrow->mtype = MEM_DDR; /* i82975x supports only DDR2 */ csrow->dtype = i82975x_dram_type(mch_window, index); csrow->edac_mode = EDAC_SECDED; /* only supported */ } } /* #define i82975x_DEBUG_IOMEM */ #ifdef i82975x_DEBUG_IOMEM static void i82975x_print_dram_timings(void __iomem *mch_window) { /* * The register meanings are from Intel specs; * (shows 13-5-5-5 for 800-DDR2) * Asus P5W Bios reports 15-5-4-4 * What's your religion? */ static const int caslats[4] = { 5, 4, 3, 6 }; u32 dtreg[2]; dtreg[0] = readl(mch_window + 0x114); dtreg[1] = readl(mch_window + 0x194); i82975x_printk(KERN_INFO, "DRAM Timings : Ch0 Ch1\n" " RAS Active Min = %d %d\n" " CAS latency = %d %d\n" " RAS to CAS = %d %d\n" " RAS precharge = %d %d\n", (dtreg[0] >> 19 ) & 0x0f, (dtreg[1] >> 19) & 0x0f, caslats[(dtreg[0] >> 8) & 0x03], caslats[(dtreg[1] >> 8) & 0x03], ((dtreg[0] >> 4) & 0x07) + 2, ((dtreg[1] >> 4) & 0x07) + 2, (dtreg[0] & 0x07) + 2, (dtreg[1] & 0x07) + 2 ); } #endif static int i82975x_probe1(struct pci_dev *pdev, int dev_idx) { int rc = -ENODEV; struct mem_ctl_info *mci; struct i82975x_pvt *pvt; void __iomem *mch_window; u32 mchbar; u32 drc[2]; struct i82975x_error_info discard; int chans; #ifdef i82975x_DEBUG_IOMEM u8 c0drb[4]; u8 c1drb[4]; #endif debugf0("%s()\n", __func__); pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar); if (!(mchbar & 1)) { debugf3("%s(): failed, MCHBAR disabled!\n", __func__); goto fail0; } mchbar &= 0xffffc000; /* bits 31:14 used for 16K window */ mch_window = ioremap_nocache(mchbar, 0x1000); #ifdef i82975x_DEBUG_IOMEM i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n", mchbar, mch_window); c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0); c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1); c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2); c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3); c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0); c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1); c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2); c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3); i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]); i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]); i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]); i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]); i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]); i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]); i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]); i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]); #endif drc[0] = readl(mch_window + I82975X_DRC_CH0M0); drc[1] = readl(mch_window + I82975X_DRC_CH1M0); #ifdef i82975x_DEBUG_IOMEM i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0], ((drc[0] >> 21) & 3) == 1 ? "ECC enabled" : "ECC disabled"); i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1], ((drc[1] >> 21) & 3) == 1 ? "ECC enabled" : "ECC disabled"); i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n", readw(mch_window + I82975X_C0BNKARC)); i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n", readw(mch_window + I82975X_C1BNKARC)); i82975x_print_dram_timings(mch_window); goto fail1; #endif if (!(((drc[0] >> 21) & 3) == 1 || ((drc[1] >> 21) & 3) == 1)) { i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n"); goto fail1; } chans = dual_channel_active(mch_window) + 1; /* assuming only one controller, index thus is 0 */ mci = edac_mc_alloc(sizeof(*pvt), I82975X_NR_CSROWS(chans), chans, 0); if (!mci) { rc = -ENOMEM; goto fail1; } debugf3("%s(): init mci\n", __func__); mci->dev = &pdev->dev; mci->mtype_cap = MEM_FLAG_DDR; mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; mci->mod_name = EDAC_MOD_STR; mci->mod_ver = I82975X_REVISION; mci->ctl_name = i82975x_devs[dev_idx].ctl_name; mci->edac_check = i82975x_check; mci->ctl_page_to_phys = NULL; debugf3("%s(): init pvt\n", __func__); pvt = (struct i82975x_pvt *) mci->pvt_info; pvt->mch_window = mch_window; i82975x_init_csrows(mci, pdev, mch_window); i82975x_get_error_info(mci, &discard); /* clear counters */ /* finalize this instance of memory controller with edac core */ if (edac_mc_add_mc(mci)) { debugf3("%s(): failed edac_mc_add_mc()\n", __func__); goto fail2; } /* get this far and it's successful */ debugf3("%s(): success\n", __func__); return 0; fail2: edac_mc_free(mci); fail1: iounmap(mch_window); fail0: return rc; } /* returns count (>= 0), or negative on error */ static int __devinit i82975x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { int rc; debugf0("%s()\n", __func__); if (pci_enable_device(pdev) < 0) return -EIO; rc = i82975x_probe1(pdev, ent->driver_data); if (mci_pdev == NULL) mci_pdev = pci_dev_get(pdev); return rc; } static void __devexit i82975x_remove_one(struct pci_dev *pdev) { struct mem_ctl_info *mci; struct i82975x_pvt *pvt; debugf0("%s()\n", __func__); mci = edac_mc_del_mc(&pdev->dev); if (mci == NULL) return; pvt = mci->pvt_info; if (pvt->mch_window) iounmap( pvt->mch_window ); edac_mc_free(mci); } static const struct pci_device_id i82975x_pci_tbl[] __devinitdata = { { PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0, I82975X }, { 0, } /* 0 terminated list. */ }; MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl); static struct pci_driver i82975x_driver = { .name = EDAC_MOD_STR, .probe = i82975x_init_one, .remove = __devexit_p(i82975x_remove_one), .id_table = i82975x_pci_tbl, }; static int __init i82975x_init(void) { int pci_rc; debugf3("%s()\n", __func__); pci_rc = pci_register_driver(&i82975x_driver); if (pci_rc < 0) goto fail0; if (mci_pdev == NULL) { mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82975_0, NULL); if (!mci_pdev) { debugf0("i82975x pci_get_device fail\n"); pci_rc = -ENODEV; goto fail1; } pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl); if (pci_rc < 0) { debugf0("i82975x init fail\n"); pci_rc = -ENODEV; goto fail1; } } return 0; fail1: pci_unregister_driver(&i82975x_driver); fail0: if (mci_pdev != NULL) pci_dev_put(mci_pdev); return pci_rc; } static void __exit i82975x_exit(void) { debugf3("%s()\n", __func__); pci_unregister_driver(&i82975x_driver); if (!i82975x_registered) { i82975x_remove_one(mci_pdev); pci_dev_put(mci_pdev); } } module_init(i82975x_init); module_exit(i82975x_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arvind R. <arvind@acarlab.com>"); MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");