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/slab.h> 17 #include "edac_mc.h" 18 19 #define I82860_REVISION " Ver: 2.0.1 " __DATE__ 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 61 static struct pci_dev *mci_pdev = NULL; /* init dev: in case that AGP code 62 * has already registered driver 63 */ 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->dev); 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, 95 &info->derrsyn); 96 } 97 } 98 99 static int i82860_process_error_info(struct mem_ctl_info *mci, 100 struct i82860_error_info *info, int handle_errors) 101 { 102 int row; 103 104 if (!(info->errsts2 & 0x0003)) 105 return 0; 106 107 if (!handle_errors) 108 return 1; 109 110 if ((info->errsts ^ info->errsts2) & 0x0003) { 111 edac_mc_handle_ce_no_info(mci, "UE overwrote CE"); 112 info->errsts = info->errsts2; 113 } 114 115 info->eap >>= PAGE_SHIFT; 116 row = edac_mc_find_csrow_by_page(mci, info->eap); 117 118 if (info->errsts & 0x0002) 119 edac_mc_handle_ue(mci, info->eap, 0, row, "i82860 UE"); 120 else 121 edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row, 0, 122 "i82860 UE"); 123 124 return 1; 125 } 126 127 static void i82860_check(struct mem_ctl_info *mci) 128 { 129 struct i82860_error_info info; 130 131 debugf1("MC%d: %s()\n", mci->mc_idx, __func__); 132 i82860_get_error_info(mci, &info); 133 i82860_process_error_info(mci, &info, 1); 134 } 135 136 static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev) 137 { 138 unsigned long last_cumul_size; 139 u16 mchcfg_ddim; /* DRAM Data Integrity Mode 0=none, 2=edac */ 140 u16 value; 141 u32 cumul_size; 142 struct csrow_info *csrow; 143 int index; 144 145 pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim); 146 mchcfg_ddim = mchcfg_ddim & 0x180; 147 last_cumul_size = 0; 148 149 /* The group row boundary (GRA) reg values are boundary address 150 * for each DRAM row with a granularity of 16MB. GRA regs are 151 * cumulative; therefore GRA15 will contain the total memory contained 152 * in all eight rows. 153 */ 154 for (index = 0; index < mci->nr_csrows; index++) { 155 csrow = &mci->csrows[index]; 156 pci_read_config_word(pdev, I82860_GBA + index * 2, &value); 157 cumul_size = (value & I82860_GBA_MASK) << 158 (I82860_GBA_SHIFT - PAGE_SHIFT); 159 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index, 160 cumul_size); 161 162 if (cumul_size == last_cumul_size) 163 continue; /* not populated */ 164 165 csrow->first_page = last_cumul_size; 166 csrow->last_page = cumul_size - 1; 167 csrow->nr_pages = cumul_size - last_cumul_size; 168 last_cumul_size = cumul_size; 169 csrow->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */ 170 csrow->mtype = MEM_RMBS; 171 csrow->dtype = DEV_UNKNOWN; 172 csrow->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE; 173 } 174 } 175 176 static int i82860_probe1(struct pci_dev *pdev, int dev_idx) 177 { 178 struct mem_ctl_info *mci; 179 struct i82860_error_info discard; 180 181 /* RDRAM has channels but these don't map onto the abstractions that 182 edac uses. 183 The device groups from the GRA registers seem to map reasonably 184 well onto the notion of a chip select row. 185 There are 16 GRA registers and since the name is associated with 186 the channel and the GRA registers map to physical devices so we are 187 going to make 1 channel for group. 188 */ 189 mci = edac_mc_alloc(0, 16, 1); 190 191 if (!mci) 192 return -ENOMEM; 193 194 debugf3("%s(): init mci\n", __func__); 195 mci->dev = &pdev->dev; 196 mci->mtype_cap = MEM_FLAG_DDR; 197 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; 198 /* I"m not sure about this but I think that all RDRAM is SECDED */ 199 mci->edac_cap = EDAC_FLAG_SECDED; 200 mci->mod_name = EDAC_MOD_STR; 201 mci->mod_ver = I82860_REVISION; 202 mci->ctl_name = i82860_devs[dev_idx].ctl_name; 203 mci->edac_check = i82860_check; 204 mci->ctl_page_to_phys = NULL; 205 i82860_init_csrows(mci, pdev); 206 i82860_get_error_info(mci, &discard); /* clear counters */ 207 208 /* Here we assume that we will never see multiple instances of this 209 * type of memory controller. The ID is therefore hardcoded to 0. 210 */ 211 if (edac_mc_add_mc(mci,0)) { 212 debugf3("%s(): failed edac_mc_add_mc()\n", __func__); 213 goto fail; 214 } 215 216 /* get this far and it's successful */ 217 debugf3("%s(): success\n", __func__); 218 219 return 0; 220 221 fail: 222 edac_mc_free(mci); 223 return -ENODEV; 224 } 225 226 /* returns count (>= 0), or negative on error */ 227 static int __devinit i82860_init_one(struct pci_dev *pdev, 228 const struct pci_device_id *ent) 229 { 230 int rc; 231 232 debugf0("%s()\n", __func__); 233 i82860_printk(KERN_INFO, "i82860 init one\n"); 234 235 if (pci_enable_device(pdev) < 0) 236 return -EIO; 237 238 rc = i82860_probe1(pdev, ent->driver_data); 239 240 if (rc == 0) 241 mci_pdev = pci_dev_get(pdev); 242 243 return rc; 244 } 245 246 static void __devexit i82860_remove_one(struct pci_dev *pdev) 247 { 248 struct mem_ctl_info *mci; 249 250 debugf0("%s()\n", __func__); 251 252 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) 253 return; 254 255 edac_mc_free(mci); 256 } 257 258 static const struct pci_device_id i82860_pci_tbl[] __devinitdata = { 259 { 260 PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0, 261 I82860 262 }, 263 { 264 0, 265 } /* 0 terminated list. */ 266 }; 267 268 MODULE_DEVICE_TABLE(pci, i82860_pci_tbl); 269 270 static struct pci_driver i82860_driver = { 271 .name = EDAC_MOD_STR, 272 .probe = i82860_init_one, 273 .remove = __devexit_p(i82860_remove_one), 274 .id_table = i82860_pci_tbl, 275 }; 276 277 static int __init i82860_init(void) 278 { 279 int pci_rc; 280 281 debugf3("%s()\n", __func__); 282 283 if ((pci_rc = pci_register_driver(&i82860_driver)) < 0) 284 goto fail0; 285 286 if (!mci_pdev) { 287 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 288 PCI_DEVICE_ID_INTEL_82860_0, NULL); 289 290 if (mci_pdev == NULL) { 291 debugf0("860 pci_get_device fail\n"); 292 pci_rc = -ENODEV; 293 goto fail1; 294 } 295 296 pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl); 297 298 if (pci_rc < 0) { 299 debugf0("860 init fail\n"); 300 pci_rc = -ENODEV; 301 goto fail1; 302 } 303 } 304 305 return 0; 306 307 fail1: 308 pci_unregister_driver(&i82860_driver); 309 310 fail0: 311 if (mci_pdev != NULL) 312 pci_dev_put(mci_pdev); 313 314 return pci_rc; 315 } 316 317 static void __exit i82860_exit(void) 318 { 319 debugf3("%s()\n", __func__); 320 321 pci_unregister_driver(&i82860_driver); 322 323 if (mci_pdev != NULL) 324 pci_dev_put(mci_pdev); 325 } 326 327 module_init(i82860_init); 328 module_exit(i82860_exit); 329 330 MODULE_LICENSE("GPL"); 331 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) " 332 "Ben Woodard <woodard@redhat.com>"); 333 MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers"); 334