1 /* 2 * Intel 82860 Memory Controller kernel module 3 * (C) 2005 Red Hat (http://www.redhat.com) 4 * This file may be distributed under the terms of the 5 * GNU General Public License. 6 * 7 * Written by Ben Woodard <woodard@redhat.com> 8 * shamelessly copied from and based upon the edac_i82875 driver 9 * by Thayne Harbaugh of Linux Networx. (http://lnxi.com) 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/pci.h> 15 #include <linux/pci_ids.h> 16 #include <linux/edac.h> 17 #include "edac_core.h" 18 19 #define I82860_REVISION " Ver: 2.0.2" 20 #define EDAC_MOD_STR "i82860_edac" 21 22 #define i82860_printk(level, fmt, arg...) \ 23 edac_printk(level, "i82860", fmt, ##arg) 24 25 #define i82860_mc_printk(mci, level, fmt, arg...) \ 26 edac_mc_chipset_printk(mci, level, "i82860", fmt, ##arg) 27 28 #ifndef PCI_DEVICE_ID_INTEL_82860_0 29 #define PCI_DEVICE_ID_INTEL_82860_0 0x2531 30 #endif /* PCI_DEVICE_ID_INTEL_82860_0 */ 31 32 #define I82860_MCHCFG 0x50 33 #define I82860_GBA 0x60 34 #define I82860_GBA_MASK 0x7FF 35 #define I82860_GBA_SHIFT 24 36 #define I82860_ERRSTS 0xC8 37 #define I82860_EAP 0xE4 38 #define I82860_DERRCTL_STS 0xE2 39 40 enum i82860_chips { 41 I82860 = 0, 42 }; 43 44 struct i82860_dev_info { 45 const char *ctl_name; 46 }; 47 48 struct i82860_error_info { 49 u16 errsts; 50 u32 eap; 51 u16 derrsyn; 52 u16 errsts2; 53 }; 54 55 static const struct i82860_dev_info i82860_devs[] = { 56 [I82860] = { 57 .ctl_name = "i82860"}, 58 }; 59 60 static struct pci_dev *mci_pdev; /* init dev: in case that AGP code 61 * has already registered driver 62 */ 63 static struct edac_pci_ctl_info *i82860_pci; 64 65 static void i82860_get_error_info(struct mem_ctl_info *mci, 66 struct i82860_error_info *info) 67 { 68 struct pci_dev *pdev; 69 70 pdev = to_pci_dev(mci->pdev); 71 72 /* 73 * This is a mess because there is no atomic way to read all the 74 * registers at once and the registers can transition from CE being 75 * overwritten by UE. 76 */ 77 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts); 78 pci_read_config_dword(pdev, I82860_EAP, &info->eap); 79 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn); 80 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts2); 81 82 pci_write_bits16(pdev, I82860_ERRSTS, 0x0003, 0x0003); 83 84 /* 85 * If the error is the same for both reads then the first set of reads 86 * is valid. If there is a change then there is a CE no info and the 87 * second set of reads is valid and should be UE info. 88 */ 89 if (!(info->errsts2 & 0x0003)) 90 return; 91 92 if ((info->errsts ^ info->errsts2) & 0x0003) { 93 pci_read_config_dword(pdev, I82860_EAP, &info->eap); 94 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn); 95 } 96 } 97 98 static int i82860_process_error_info(struct mem_ctl_info *mci, 99 struct i82860_error_info *info, 100 int handle_errors) 101 { 102 struct dimm_info *dimm; 103 int row; 104 105 if (!(info->errsts2 & 0x0003)) 106 return 0; 107 108 if (!handle_errors) 109 return 1; 110 111 if ((info->errsts ^ info->errsts2) & 0x0003) { 112 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0, 113 -1, -1, -1, "UE overwrote CE", ""); 114 info->errsts = info->errsts2; 115 } 116 117 info->eap >>= PAGE_SHIFT; 118 row = edac_mc_find_csrow_by_page(mci, info->eap); 119 dimm = mci->csrows[row]->channels[0]->dimm; 120 121 if (info->errsts & 0x0002) 122 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 123 info->eap, 0, 0, 124 dimm->location[0], dimm->location[1], -1, 125 "i82860 UE", ""); 126 else 127 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 128 info->eap, 0, info->derrsyn, 129 dimm->location[0], dimm->location[1], -1, 130 "i82860 CE", ""); 131 132 return 1; 133 } 134 135 static void i82860_check(struct mem_ctl_info *mci) 136 { 137 struct i82860_error_info info; 138 139 edac_dbg(1, "MC%d\n", mci->mc_idx); 140 i82860_get_error_info(mci, &info); 141 i82860_process_error_info(mci, &info, 1); 142 } 143 144 static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev) 145 { 146 unsigned long last_cumul_size; 147 u16 mchcfg_ddim; /* DRAM Data Integrity Mode 0=none, 2=edac */ 148 u16 value; 149 u32 cumul_size; 150 struct csrow_info *csrow; 151 struct dimm_info *dimm; 152 int index; 153 154 pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim); 155 mchcfg_ddim = mchcfg_ddim & 0x180; 156 last_cumul_size = 0; 157 158 /* The group row boundary (GRA) reg values are boundary address 159 * for each DRAM row with a granularity of 16MB. GRA regs are 160 * cumulative; therefore GRA15 will contain the total memory contained 161 * in all eight rows. 162 */ 163 for (index = 0; index < mci->nr_csrows; index++) { 164 csrow = mci->csrows[index]; 165 dimm = csrow->channels[0]->dimm; 166 167 pci_read_config_word(pdev, I82860_GBA + index * 2, &value); 168 cumul_size = (value & I82860_GBA_MASK) << 169 (I82860_GBA_SHIFT - PAGE_SHIFT); 170 edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size); 171 172 if (cumul_size == last_cumul_size) 173 continue; /* not populated */ 174 175 csrow->first_page = last_cumul_size; 176 csrow->last_page = cumul_size - 1; 177 dimm->nr_pages = cumul_size - last_cumul_size; 178 last_cumul_size = cumul_size; 179 dimm->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */ 180 dimm->mtype = MEM_RMBS; 181 dimm->dtype = DEV_UNKNOWN; 182 dimm->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE; 183 } 184 } 185 186 static int i82860_probe1(struct pci_dev *pdev, int dev_idx) 187 { 188 struct mem_ctl_info *mci; 189 struct edac_mc_layer layers[2]; 190 struct i82860_error_info discard; 191 192 /* 193 * RDRAM has channels but these don't map onto the csrow abstraction. 194 * According with the datasheet, there are 2 Rambus channels, supporting 195 * up to 16 direct RDRAM devices. 196 * The device groups from the GRA registers seem to map reasonably 197 * well onto the notion of a chip select row. 198 * There are 16 GRA registers and since the name is associated with 199 * the channel and the GRA registers map to physical devices so we are 200 * going to make 1 channel for group. 201 */ 202 layers[0].type = EDAC_MC_LAYER_CHANNEL; 203 layers[0].size = 2; 204 layers[0].is_virt_csrow = true; 205 layers[1].type = EDAC_MC_LAYER_SLOT; 206 layers[1].size = 8; 207 layers[1].is_virt_csrow = true; 208 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0); 209 if (!mci) 210 return -ENOMEM; 211 212 edac_dbg(3, "init mci\n"); 213 mci->pdev = &pdev->dev; 214 mci->mtype_cap = MEM_FLAG_DDR; 215 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; 216 /* I"m not sure about this but I think that all RDRAM is SECDED */ 217 mci->edac_cap = EDAC_FLAG_SECDED; 218 mci->mod_name = EDAC_MOD_STR; 219 mci->mod_ver = I82860_REVISION; 220 mci->ctl_name = i82860_devs[dev_idx].ctl_name; 221 mci->dev_name = pci_name(pdev); 222 mci->edac_check = i82860_check; 223 mci->ctl_page_to_phys = NULL; 224 i82860_init_csrows(mci, pdev); 225 i82860_get_error_info(mci, &discard); /* clear counters */ 226 227 /* Here we assume that we will never see multiple instances of this 228 * type of memory controller. The ID is therefore hardcoded to 0. 229 */ 230 if (edac_mc_add_mc(mci)) { 231 edac_dbg(3, "failed edac_mc_add_mc()\n"); 232 goto fail; 233 } 234 235 /* allocating generic PCI control info */ 236 i82860_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR); 237 if (!i82860_pci) { 238 printk(KERN_WARNING 239 "%s(): Unable to create PCI control\n", 240 __func__); 241 printk(KERN_WARNING 242 "%s(): PCI error report via EDAC not setup\n", 243 __func__); 244 } 245 246 /* get this far and it's successful */ 247 edac_dbg(3, "success\n"); 248 249 return 0; 250 251 fail: 252 edac_mc_free(mci); 253 return -ENODEV; 254 } 255 256 /* returns count (>= 0), or negative on error */ 257 static int i82860_init_one(struct pci_dev *pdev, 258 const struct pci_device_id *ent) 259 { 260 int rc; 261 262 edac_dbg(0, "\n"); 263 i82860_printk(KERN_INFO, "i82860 init one\n"); 264 265 if (pci_enable_device(pdev) < 0) 266 return -EIO; 267 268 rc = i82860_probe1(pdev, ent->driver_data); 269 270 if (rc == 0) 271 mci_pdev = pci_dev_get(pdev); 272 273 return rc; 274 } 275 276 static void i82860_remove_one(struct pci_dev *pdev) 277 { 278 struct mem_ctl_info *mci; 279 280 edac_dbg(0, "\n"); 281 282 if (i82860_pci) 283 edac_pci_release_generic_ctl(i82860_pci); 284 285 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) 286 return; 287 288 edac_mc_free(mci); 289 } 290 291 static const struct pci_device_id i82860_pci_tbl[] = { 292 { 293 PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 294 I82860}, 295 { 296 0, 297 } /* 0 terminated list. */ 298 }; 299 300 MODULE_DEVICE_TABLE(pci, i82860_pci_tbl); 301 302 static struct pci_driver i82860_driver = { 303 .name = EDAC_MOD_STR, 304 .probe = i82860_init_one, 305 .remove = i82860_remove_one, 306 .id_table = i82860_pci_tbl, 307 }; 308 309 static int __init i82860_init(void) 310 { 311 int pci_rc; 312 313 edac_dbg(3, "\n"); 314 315 /* Ensure that the OPSTATE is set correctly for POLL or NMI */ 316 opstate_init(); 317 318 if ((pci_rc = pci_register_driver(&i82860_driver)) < 0) 319 goto fail0; 320 321 if (!mci_pdev) { 322 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 323 PCI_DEVICE_ID_INTEL_82860_0, NULL); 324 325 if (mci_pdev == NULL) { 326 edac_dbg(0, "860 pci_get_device fail\n"); 327 pci_rc = -ENODEV; 328 goto fail1; 329 } 330 331 pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl); 332 333 if (pci_rc < 0) { 334 edac_dbg(0, "860 init fail\n"); 335 pci_rc = -ENODEV; 336 goto fail1; 337 } 338 } 339 340 return 0; 341 342 fail1: 343 pci_unregister_driver(&i82860_driver); 344 345 fail0: 346 if (mci_pdev != NULL) 347 pci_dev_put(mci_pdev); 348 349 return pci_rc; 350 } 351 352 static void __exit i82860_exit(void) 353 { 354 edac_dbg(3, "\n"); 355 356 pci_unregister_driver(&i82860_driver); 357 358 if (mci_pdev != NULL) 359 pci_dev_put(mci_pdev); 360 } 361 362 module_init(i82860_init); 363 module_exit(i82860_exit); 364 365 MODULE_LICENSE("GPL"); 366 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) " 367 "Ben Woodard <woodard@redhat.com>"); 368 MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers"); 369 370 module_param(edac_op_state, int, 0444); 371 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI"); 372