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.
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)
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 <linux/edac.h>
18 #include "edac_core.h"
20 #define I82860_REVISION " Ver: 2.0.2 " __DATE__
21 #define EDAC_MOD_STR "i82860_edac"
23 #define i82860_printk(level, fmt, arg...) \
24 edac_printk(level, "i82860", fmt, ##arg)
26 #define i82860_mc_printk(mci, level, fmt, arg...) \
27 edac_mc_chipset_printk(mci, level, "i82860", fmt, ##arg)
29 #ifndef PCI_DEVICE_ID_INTEL_82860_0
30 #define PCI_DEVICE_ID_INTEL_82860_0 0x2531
31 #endif /* PCI_DEVICE_ID_INTEL_82860_0 */
33 #define I82860_MCHCFG 0x50
34 #define I82860_GBA 0x60
35 #define I82860_GBA_MASK 0x7FF
36 #define I82860_GBA_SHIFT 24
37 #define I82860_ERRSTS 0xC8
38 #define I82860_EAP 0xE4
39 #define I82860_DERRCTL_STS 0xE2
45 struct i82860_dev_info {
49 struct i82860_error_info {
56 static const struct i82860_dev_info i82860_devs[] = {
58 .ctl_name = "i82860"},
61 static struct pci_dev *mci_pdev; /* init dev: in case that AGP code
62 * has already registered driver
64 static struct edac_pci_ctl_info *i82860_pci;
66 static void i82860_get_error_info(struct mem_ctl_info *mci,
67 struct i82860_error_info *info)
71 pdev = to_pci_dev(mci->dev);
74 * This is a mess because there is no atomic way to read all the
75 * registers at once and the registers can transition from CE being
78 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts);
79 pci_read_config_dword(pdev, I82860_EAP, &info->eap);
80 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
81 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts2);
83 pci_write_bits16(pdev, I82860_ERRSTS, 0x0003, 0x0003);
86 * If the error is the same for both reads then the first set of reads
87 * is valid. If there is a change then there is a CE no info and the
88 * second set of reads is valid and should be UE info.
90 if (!(info->errsts2 & 0x0003))
93 if ((info->errsts ^ info->errsts2) & 0x0003) {
94 pci_read_config_dword(pdev, I82860_EAP, &info->eap);
95 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
99 static int i82860_process_error_info(struct mem_ctl_info *mci,
100 struct i82860_error_info *info,
105 if (!(info->errsts2 & 0x0003))
111 if ((info->errsts ^ info->errsts2) & 0x0003) {
112 edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
113 info->errsts = info->errsts2;
116 info->eap >>= PAGE_SHIFT;
117 row = edac_mc_find_csrow_by_page(mci, info->eap);
119 if (info->errsts & 0x0002)
120 edac_mc_handle_ue(mci, info->eap, 0, row, "i82860 UE");
122 edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row, 0,
128 static void i82860_check(struct mem_ctl_info *mci)
130 struct i82860_error_info info;
132 debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
133 i82860_get_error_info(mci, &info);
134 i82860_process_error_info(mci, &info, 1);
137 static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev)
139 unsigned long last_cumul_size;
140 u16 mchcfg_ddim; /* DRAM Data Integrity Mode 0=none, 2=edac */
143 struct csrow_info *csrow;
146 pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim);
147 mchcfg_ddim = mchcfg_ddim & 0x180;
150 /* The group row boundary (GRA) reg values are boundary address
151 * for each DRAM row with a granularity of 16MB. GRA regs are
152 * cumulative; therefore GRA15 will contain the total memory contained
155 for (index = 0; index < mci->nr_csrows; index++) {
156 csrow = &mci->csrows[index];
157 pci_read_config_word(pdev, I82860_GBA + index * 2, &value);
158 cumul_size = (value & I82860_GBA_MASK) <<
159 (I82860_GBA_SHIFT - PAGE_SHIFT);
160 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
163 if (cumul_size == last_cumul_size)
164 continue; /* not populated */
166 csrow->first_page = last_cumul_size;
167 csrow->last_page = cumul_size - 1;
168 csrow->nr_pages = cumul_size - last_cumul_size;
169 last_cumul_size = cumul_size;
170 csrow->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */
171 csrow->mtype = MEM_RMBS;
172 csrow->dtype = DEV_UNKNOWN;
173 csrow->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE;
177 static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
179 struct mem_ctl_info *mci;
180 struct i82860_error_info discard;
182 /* RDRAM has channels but these don't map onto the abstractions that
184 The device groups from the GRA registers seem to map reasonably
185 well onto the notion of a chip select row.
186 There are 16 GRA registers and since the name is associated with
187 the channel and the GRA registers map to physical devices so we are
188 going to make 1 channel for group.
190 mci = edac_mc_alloc(0, 16, 1, 0);
195 debugf3("%s(): init mci\n", __func__);
196 mci->dev = &pdev->dev;
197 mci->mtype_cap = MEM_FLAG_DDR;
198 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
199 /* I"m not sure about this but I think that all RDRAM is SECDED */
200 mci->edac_cap = EDAC_FLAG_SECDED;
201 mci->mod_name = EDAC_MOD_STR;
202 mci->mod_ver = I82860_REVISION;
203 mci->ctl_name = i82860_devs[dev_idx].ctl_name;
204 mci->dev_name = pci_name(pdev);
205 mci->edac_check = i82860_check;
206 mci->ctl_page_to_phys = NULL;
207 i82860_init_csrows(mci, pdev);
208 i82860_get_error_info(mci, &discard); /* clear counters */
210 /* Here we assume that we will never see multiple instances of this
211 * type of memory controller. The ID is therefore hardcoded to 0.
213 if (edac_mc_add_mc(mci)) {
214 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
218 /* allocating generic PCI control info */
219 i82860_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
222 "%s(): Unable to create PCI control\n",
225 "%s(): PCI error report via EDAC not setup\n",
229 /* get this far and it's successful */
230 debugf3("%s(): success\n", __func__);
239 /* returns count (>= 0), or negative on error */
240 static int __devinit i82860_init_one(struct pci_dev *pdev,
241 const struct pci_device_id *ent)
245 debugf0("%s()\n", __func__);
246 i82860_printk(KERN_INFO, "i82860 init one\n");
248 if (pci_enable_device(pdev) < 0)
251 rc = i82860_probe1(pdev, ent->driver_data);
254 mci_pdev = pci_dev_get(pdev);
259 static void __devexit i82860_remove_one(struct pci_dev *pdev)
261 struct mem_ctl_info *mci;
263 debugf0("%s()\n", __func__);
266 edac_pci_release_generic_ctl(i82860_pci);
268 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
274 static const struct pci_device_id i82860_pci_tbl[] __devinitdata = {
276 PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
280 } /* 0 terminated list. */
283 MODULE_DEVICE_TABLE(pci, i82860_pci_tbl);
285 static struct pci_driver i82860_driver = {
286 .name = EDAC_MOD_STR,
287 .probe = i82860_init_one,
288 .remove = __devexit_p(i82860_remove_one),
289 .id_table = i82860_pci_tbl,
292 static int __init i82860_init(void)
296 debugf3("%s()\n", __func__);
298 /* Ensure that the OPSTATE is set correctly for POLL or NMI */
301 if ((pci_rc = pci_register_driver(&i82860_driver)) < 0)
305 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
306 PCI_DEVICE_ID_INTEL_82860_0, NULL);
308 if (mci_pdev == NULL) {
309 debugf0("860 pci_get_device fail\n");
314 pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl);
317 debugf0("860 init fail\n");
326 pci_unregister_driver(&i82860_driver);
329 if (mci_pdev != NULL)
330 pci_dev_put(mci_pdev);
335 static void __exit i82860_exit(void)
337 debugf3("%s()\n", __func__);
339 pci_unregister_driver(&i82860_driver);
341 if (mci_pdev != NULL)
342 pci_dev_put(mci_pdev);
345 module_init(i82860_init);
346 module_exit(i82860_exit);
348 MODULE_LICENSE("GPL");
349 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) "
350 "Ben Woodard <woodard@redhat.com>");
351 MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers");
353 module_param(edac_op_state, int, 0444);
354 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");