1 /* 2 * AMD 76x Memory Controller kernel module 3 * (C) 2003 Linux Networx (http://lnxi.com) 4 * This file may be distributed under the terms of the 5 * GNU General Public License. 6 * 7 * Written by Thayne Harbaugh 8 * Based on work by Dan Hollis <goemon at anime dot net> and others. 9 * http://www.anime.net/~goemon/linux-ecc/ 10 * 11 * $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $ 12 * 13 */ 14 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/pci.h> 18 #include <linux/pci_ids.h> 19 #include <linux/edac.h> 20 #include "edac_module.h" 21 22 #define EDAC_MOD_STR "amd76x_edac" 23 24 #define amd76x_printk(level, fmt, arg...) \ 25 edac_printk(level, "amd76x", fmt, ##arg) 26 27 #define amd76x_mc_printk(mci, level, fmt, arg...) \ 28 edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg) 29 30 #define AMD76X_NR_CSROWS 8 31 #define AMD76X_NR_DIMMS 4 32 33 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */ 34 35 #define AMD76X_ECC_MODE_STATUS 0x48 /* Mode and status of ECC (32b) 36 * 37 * 31:16 reserved 38 * 15:14 SERR enabled: x1=ue 1x=ce 39 * 13 reserved 40 * 12 diag: disabled, enabled 41 * 11:10 mode: dis, EC, ECC, ECC+scrub 42 * 9:8 status: x1=ue 1x=ce 43 * 7:4 UE cs row 44 * 3:0 CE cs row 45 */ 46 47 #define AMD76X_DRAM_MODE_STATUS 0x58 /* DRAM Mode and status (32b) 48 * 49 * 31:26 clock disable 5 - 0 50 * 25 SDRAM init 51 * 24 reserved 52 * 23 mode register service 53 * 22:21 suspend to RAM 54 * 20 burst refresh enable 55 * 19 refresh disable 56 * 18 reserved 57 * 17:16 cycles-per-refresh 58 * 15:8 reserved 59 * 7:0 x4 mode enable 7 - 0 60 */ 61 62 #define AMD76X_MEM_BASE_ADDR 0xC0 /* Memory base address (8 x 32b) 63 * 64 * 31:23 chip-select base 65 * 22:16 reserved 66 * 15:7 chip-select mask 67 * 6:3 reserved 68 * 2:1 address mode 69 * 0 chip-select enable 70 */ 71 72 struct amd76x_error_info { 73 u32 ecc_mode_status; 74 }; 75 76 enum amd76x_chips { 77 AMD761 = 0, 78 AMD762 79 }; 80 81 struct amd76x_dev_info { 82 const char *ctl_name; 83 }; 84 85 static const struct amd76x_dev_info amd76x_devs[] = { 86 [AMD761] = { 87 .ctl_name = "AMD761"}, 88 [AMD762] = { 89 .ctl_name = "AMD762"}, 90 }; 91 92 static struct edac_pci_ctl_info *amd76x_pci; 93 94 /** 95 * amd76x_get_error_info - fetch error information 96 * @mci: Memory controller 97 * @info: Info to fill in 98 * 99 * Fetch and store the AMD76x ECC status. Clear pending status 100 * on the chip so that further errors will be reported 101 */ 102 static void amd76x_get_error_info(struct mem_ctl_info *mci, 103 struct amd76x_error_info *info) 104 { 105 struct pci_dev *pdev; 106 107 pdev = to_pci_dev(mci->pdev); 108 pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, 109 &info->ecc_mode_status); 110 111 if (info->ecc_mode_status & BIT(8)) 112 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS, 113 (u32) BIT(8), (u32) BIT(8)); 114 115 if (info->ecc_mode_status & BIT(9)) 116 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS, 117 (u32) BIT(9), (u32) BIT(9)); 118 } 119 120 /** 121 * amd76x_process_error_info - Error check 122 * @mci: Memory controller 123 * @info: Previously fetched information from chip 124 * @handle_errors: 1 if we should do recovery 125 * 126 * Process the chip state and decide if an error has occurred. 127 * A return of 1 indicates an error. Also if handle_errors is true 128 * then attempt to handle and clean up after the error 129 */ 130 static int amd76x_process_error_info(struct mem_ctl_info *mci, 131 struct amd76x_error_info *info, 132 int handle_errors) 133 { 134 int error_found; 135 u32 row; 136 137 error_found = 0; 138 139 /* 140 * Check for an uncorrectable error 141 */ 142 if (info->ecc_mode_status & BIT(8)) { 143 error_found = 1; 144 145 if (handle_errors) { 146 row = (info->ecc_mode_status >> 4) & 0xf; 147 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 148 mci->csrows[row]->first_page, 0, 0, 149 row, 0, -1, 150 mci->ctl_name, ""); 151 } 152 } 153 154 /* 155 * Check for a correctable error 156 */ 157 if (info->ecc_mode_status & BIT(9)) { 158 error_found = 1; 159 160 if (handle_errors) { 161 row = info->ecc_mode_status & 0xf; 162 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 163 mci->csrows[row]->first_page, 0, 0, 164 row, 0, -1, 165 mci->ctl_name, ""); 166 } 167 } 168 169 return error_found; 170 } 171 172 /** 173 * amd76x_check - Poll the controller 174 * @mci: Memory controller 175 * 176 * Called by the poll handlers this function reads the status 177 * from the controller and checks for errors. 178 */ 179 static void amd76x_check(struct mem_ctl_info *mci) 180 { 181 struct amd76x_error_info info; 182 edac_dbg(3, "\n"); 183 amd76x_get_error_info(mci, &info); 184 amd76x_process_error_info(mci, &info, 1); 185 } 186 187 static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev, 188 enum edac_type edac_mode) 189 { 190 struct csrow_info *csrow; 191 struct dimm_info *dimm; 192 u32 mba, mba_base, mba_mask, dms; 193 int index; 194 195 for (index = 0; index < mci->nr_csrows; index++) { 196 csrow = mci->csrows[index]; 197 dimm = csrow->channels[0]->dimm; 198 199 /* find the DRAM Chip Select Base address and mask */ 200 pci_read_config_dword(pdev, 201 AMD76X_MEM_BASE_ADDR + (index * 4), &mba); 202 203 if (!(mba & BIT(0))) 204 continue; 205 206 mba_base = mba & 0xff800000UL; 207 mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL; 208 pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms); 209 csrow->first_page = mba_base >> PAGE_SHIFT; 210 dimm->nr_pages = (mba_mask + 1) >> PAGE_SHIFT; 211 csrow->last_page = csrow->first_page + dimm->nr_pages - 1; 212 csrow->page_mask = mba_mask >> PAGE_SHIFT; 213 dimm->grain = dimm->nr_pages << PAGE_SHIFT; 214 dimm->mtype = MEM_RDDR; 215 dimm->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN; 216 dimm->edac_mode = edac_mode; 217 } 218 } 219 220 /** 221 * amd76x_probe1 - Perform set up for detected device 222 * @pdev; PCI device detected 223 * @dev_idx: Device type index 224 * 225 * We have found an AMD76x and now need to set up the memory 226 * controller status reporting. We configure and set up the 227 * memory controller reporting and claim the device. 228 */ 229 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx) 230 { 231 static const enum edac_type ems_modes[] = { 232 EDAC_NONE, 233 EDAC_EC, 234 EDAC_SECDED, 235 EDAC_SECDED 236 }; 237 struct mem_ctl_info *mci; 238 struct edac_mc_layer layers[2]; 239 u32 ems; 240 u32 ems_mode; 241 struct amd76x_error_info discard; 242 243 edac_dbg(0, "\n"); 244 pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems); 245 ems_mode = (ems >> 10) & 0x3; 246 247 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; 248 layers[0].size = AMD76X_NR_CSROWS; 249 layers[0].is_virt_csrow = true; 250 layers[1].type = EDAC_MC_LAYER_CHANNEL; 251 layers[1].size = 1; 252 layers[1].is_virt_csrow = false; 253 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0); 254 255 if (mci == NULL) 256 return -ENOMEM; 257 258 edac_dbg(0, "mci = %p\n", mci); 259 mci->pdev = &pdev->dev; 260 mci->mtype_cap = MEM_FLAG_RDDR; 261 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; 262 mci->edac_cap = ems_mode ? 263 (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE; 264 mci->mod_name = EDAC_MOD_STR; 265 mci->ctl_name = amd76x_devs[dev_idx].ctl_name; 266 mci->dev_name = pci_name(pdev); 267 mci->edac_check = amd76x_check; 268 mci->ctl_page_to_phys = NULL; 269 270 amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]); 271 amd76x_get_error_info(mci, &discard); /* clear counters */ 272 273 /* Here we assume that we will never see multiple instances of this 274 * type of memory controller. The ID is therefore hardcoded to 0. 275 */ 276 if (edac_mc_add_mc(mci)) { 277 edac_dbg(3, "failed edac_mc_add_mc()\n"); 278 goto fail; 279 } 280 281 /* allocating generic PCI control info */ 282 amd76x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR); 283 if (!amd76x_pci) { 284 printk(KERN_WARNING 285 "%s(): Unable to create PCI control\n", 286 __func__); 287 printk(KERN_WARNING 288 "%s(): PCI error report via EDAC not setup\n", 289 __func__); 290 } 291 292 /* get this far and it's successful */ 293 edac_dbg(3, "success\n"); 294 return 0; 295 296 fail: 297 edac_mc_free(mci); 298 return -ENODEV; 299 } 300 301 /* returns count (>= 0), or negative on error */ 302 static int amd76x_init_one(struct pci_dev *pdev, 303 const struct pci_device_id *ent) 304 { 305 edac_dbg(0, "\n"); 306 307 /* don't need to call pci_enable_device() */ 308 return amd76x_probe1(pdev, ent->driver_data); 309 } 310 311 /** 312 * amd76x_remove_one - driver shutdown 313 * @pdev: PCI device being handed back 314 * 315 * Called when the driver is unloaded. Find the matching mci 316 * structure for the device then delete the mci and free the 317 * resources. 318 */ 319 static void amd76x_remove_one(struct pci_dev *pdev) 320 { 321 struct mem_ctl_info *mci; 322 323 edac_dbg(0, "\n"); 324 325 if (amd76x_pci) 326 edac_pci_release_generic_ctl(amd76x_pci); 327 328 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) 329 return; 330 331 edac_mc_free(mci); 332 } 333 334 static const struct pci_device_id amd76x_pci_tbl[] = { 335 { 336 PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 337 AMD762}, 338 { 339 PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 340 AMD761}, 341 { 342 0, 343 } /* 0 terminated list. */ 344 }; 345 346 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl); 347 348 static struct pci_driver amd76x_driver = { 349 .name = EDAC_MOD_STR, 350 .probe = amd76x_init_one, 351 .remove = amd76x_remove_one, 352 .id_table = amd76x_pci_tbl, 353 }; 354 355 static int __init amd76x_init(void) 356 { 357 /* Ensure that the OPSTATE is set correctly for POLL or NMI */ 358 opstate_init(); 359 360 return pci_register_driver(&amd76x_driver); 361 } 362 363 static void __exit amd76x_exit(void) 364 { 365 pci_unregister_driver(&amd76x_driver); 366 } 367 368 module_init(amd76x_init); 369 module_exit(amd76x_exit); 370 371 MODULE_LICENSE("GPL"); 372 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh"); 373 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers"); 374 375 module_param(edac_op_state, int, 0444); 376 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI"); 377