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/config.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/pci.h> 19 #include <linux/pci_ids.h> 20 #include <linux/slab.h> 21 #include "edac_mc.h" 22 23 #define AMD76X_REVISION " Ver: 2.0.0 " __DATE__ 24 25 26 #define amd76x_printk(level, fmt, arg...) \ 27 edac_printk(level, "amd76x", fmt, ##arg) 28 29 #define amd76x_mc_printk(mci, level, fmt, arg...) \ 30 edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg) 31 32 #define AMD76X_NR_CSROWS 8 33 #define AMD76X_NR_CHANS 1 34 #define AMD76X_NR_DIMMS 4 35 36 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */ 37 38 #define AMD76X_ECC_MODE_STATUS 0x48 /* Mode and status of ECC (32b) 39 * 40 * 31:16 reserved 41 * 15:14 SERR enabled: x1=ue 1x=ce 42 * 13 reserved 43 * 12 diag: disabled, enabled 44 * 11:10 mode: dis, EC, ECC, ECC+scrub 45 * 9:8 status: x1=ue 1x=ce 46 * 7:4 UE cs row 47 * 3:0 CE cs row 48 */ 49 50 #define AMD76X_DRAM_MODE_STATUS 0x58 /* DRAM Mode and status (32b) 51 * 52 * 31:26 clock disable 5 - 0 53 * 25 SDRAM init 54 * 24 reserved 55 * 23 mode register service 56 * 22:21 suspend to RAM 57 * 20 burst refresh enable 58 * 19 refresh disable 59 * 18 reserved 60 * 17:16 cycles-per-refresh 61 * 15:8 reserved 62 * 7:0 x4 mode enable 7 - 0 63 */ 64 65 #define AMD76X_MEM_BASE_ADDR 0xC0 /* Memory base address (8 x 32b) 66 * 67 * 31:23 chip-select base 68 * 22:16 reserved 69 * 15:7 chip-select mask 70 * 6:3 reserved 71 * 2:1 address mode 72 * 0 chip-select enable 73 */ 74 75 struct amd76x_error_info { 76 u32 ecc_mode_status; 77 }; 78 79 enum amd76x_chips { 80 AMD761 = 0, 81 AMD762 82 }; 83 84 struct amd76x_dev_info { 85 const char *ctl_name; 86 }; 87 88 static const struct amd76x_dev_info amd76x_devs[] = { 89 [AMD761] = { 90 .ctl_name = "AMD761" 91 }, 92 [AMD762] = { 93 .ctl_name = "AMD762" 94 }, 95 }; 96 97 /** 98 * amd76x_get_error_info - fetch error information 99 * @mci: Memory controller 100 * @info: Info to fill in 101 * 102 * Fetch and store the AMD76x ECC status. Clear pending status 103 * on the chip so that further errors will be reported 104 */ 105 static void amd76x_get_error_info(struct mem_ctl_info *mci, 106 struct amd76x_error_info *info) 107 { 108 struct pci_dev *pdev; 109 110 pdev = to_pci_dev(mci->dev); 111 pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, 112 &info->ecc_mode_status); 113 114 if (info->ecc_mode_status & BIT(8)) 115 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS, 116 (u32) BIT(8), (u32) BIT(8)); 117 118 if (info->ecc_mode_status & BIT(9)) 119 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS, 120 (u32) BIT(9), (u32) BIT(9)); 121 } 122 123 /** 124 * amd76x_process_error_info - Error check 125 * @mci: Memory controller 126 * @info: Previously fetched information from chip 127 * @handle_errors: 1 if we should do recovery 128 * 129 * Process the chip state and decide if an error has occurred. 130 * A return of 1 indicates an error. Also if handle_errors is true 131 * then attempt to handle and clean up after the error 132 */ 133 static int amd76x_process_error_info(struct mem_ctl_info *mci, 134 struct amd76x_error_info *info, int handle_errors) 135 { 136 int error_found; 137 u32 row; 138 139 error_found = 0; 140 141 /* 142 * Check for an uncorrectable error 143 */ 144 if (info->ecc_mode_status & BIT(8)) { 145 error_found = 1; 146 147 if (handle_errors) { 148 row = (info->ecc_mode_status >> 4) & 0xf; 149 edac_mc_handle_ue(mci, mci->csrows[row].first_page, 0, 150 row, 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_ce(mci, mci->csrows[row].first_page, 0, 163 0, row, 0, mci->ctl_name); 164 } 165 } 166 167 return error_found; 168 } 169 170 /** 171 * amd76x_check - Poll the controller 172 * @mci: Memory controller 173 * 174 * Called by the poll handlers this function reads the status 175 * from the controller and checks for errors. 176 */ 177 static void amd76x_check(struct mem_ctl_info *mci) 178 { 179 struct amd76x_error_info info; 180 debugf3("%s()\n", __func__); 181 amd76x_get_error_info(mci, &info); 182 amd76x_process_error_info(mci, &info, 1); 183 } 184 185 static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev, 186 enum edac_type edac_mode) 187 { 188 struct csrow_info *csrow; 189 u32 mba, mba_base, mba_mask, dms; 190 int index; 191 192 for (index = 0; index < mci->nr_csrows; index++) { 193 csrow = &mci->csrows[index]; 194 195 /* find the DRAM Chip Select Base address and mask */ 196 pci_read_config_dword(pdev, 197 AMD76X_MEM_BASE_ADDR + (index * 4), 198 &mba); 199 200 if (!(mba & BIT(0))) 201 continue; 202 203 mba_base = mba & 0xff800000UL; 204 mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL; 205 pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms); 206 csrow->first_page = mba_base >> PAGE_SHIFT; 207 csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT; 208 csrow->last_page = csrow->first_page + csrow->nr_pages - 1; 209 csrow->page_mask = mba_mask >> PAGE_SHIFT; 210 csrow->grain = csrow->nr_pages << PAGE_SHIFT; 211 csrow->mtype = MEM_RDDR; 212 csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN; 213 csrow->edac_mode = edac_mode; 214 } 215 } 216 217 /** 218 * amd76x_probe1 - Perform set up for detected device 219 * @pdev; PCI device detected 220 * @dev_idx: Device type index 221 * 222 * We have found an AMD76x and now need to set up the memory 223 * controller status reporting. We configure and set up the 224 * memory controller reporting and claim the device. 225 */ 226 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx) 227 { 228 static const enum edac_type ems_modes[] = { 229 EDAC_NONE, 230 EDAC_EC, 231 EDAC_SECDED, 232 EDAC_SECDED 233 }; 234 struct mem_ctl_info *mci = NULL; 235 u32 ems; 236 u32 ems_mode; 237 struct amd76x_error_info discard; 238 239 debugf0("%s()\n", __func__); 240 pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems); 241 ems_mode = (ems >> 10) & 0x3; 242 mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS); 243 244 if (mci == NULL) { 245 return -ENOMEM; 246 } 247 248 debugf0("%s(): mci = %p\n", __func__, mci); 249 mci->dev = &pdev->dev; 250 mci->mtype_cap = MEM_FLAG_RDDR; 251 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; 252 mci->edac_cap = ems_mode ? 253 (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE; 254 mci->mod_name = EDAC_MOD_STR; 255 mci->mod_ver = AMD76X_REVISION; 256 mci->ctl_name = amd76x_devs[dev_idx].ctl_name; 257 mci->edac_check = amd76x_check; 258 mci->ctl_page_to_phys = NULL; 259 260 amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]); 261 amd76x_get_error_info(mci, &discard); /* clear counters */ 262 263 /* Here we assume that we will never see multiple instances of this 264 * type of memory controller. The ID is therefore hardcoded to 0. 265 */ 266 if (edac_mc_add_mc(mci,0)) { 267 debugf3("%s(): failed edac_mc_add_mc()\n", __func__); 268 goto fail; 269 } 270 271 /* get this far and it's successful */ 272 debugf3("%s(): success\n", __func__); 273 return 0; 274 275 fail: 276 edac_mc_free(mci); 277 return -ENODEV; 278 } 279 280 /* returns count (>= 0), or negative on error */ 281 static int __devinit amd76x_init_one(struct pci_dev *pdev, 282 const struct pci_device_id *ent) 283 { 284 debugf0("%s()\n", __func__); 285 286 /* don't need to call pci_device_enable() */ 287 return amd76x_probe1(pdev, ent->driver_data); 288 } 289 290 /** 291 * amd76x_remove_one - driver shutdown 292 * @pdev: PCI device being handed back 293 * 294 * Called when the driver is unloaded. Find the matching mci 295 * structure for the device then delete the mci and free the 296 * resources. 297 */ 298 static void __devexit amd76x_remove_one(struct pci_dev *pdev) 299 { 300 struct mem_ctl_info *mci; 301 302 debugf0("%s()\n", __func__); 303 304 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) 305 return; 306 307 edac_mc_free(mci); 308 } 309 310 static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = { 311 { 312 PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 313 AMD762 314 }, 315 { 316 PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 317 AMD761 318 }, 319 { 320 0, 321 } /* 0 terminated list. */ 322 }; 323 324 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl); 325 326 static struct pci_driver amd76x_driver = { 327 .name = EDAC_MOD_STR, 328 .probe = amd76x_init_one, 329 .remove = __devexit_p(amd76x_remove_one), 330 .id_table = amd76x_pci_tbl, 331 }; 332 333 static int __init amd76x_init(void) 334 { 335 return pci_register_driver(&amd76x_driver); 336 } 337 338 static void __exit amd76x_exit(void) 339 { 340 pci_unregister_driver(&amd76x_driver); 341 } 342 343 module_init(amd76x_init); 344 module_exit(amd76x_exit); 345 346 MODULE_LICENSE("GPL"); 347 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh"); 348 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers"); 349