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.
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/
11 * $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $
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>
23 #define amd76x_printk(level, fmt, arg...) \
24 edac_printk(level, "amd76x", fmt, ##arg)
26 #define amd76x_mc_printk(mci, level, fmt, arg...) \
27 edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)
29 #define AMD76X_NR_CSROWS 8
30 #define AMD76X_NR_CHANS 1
31 #define AMD76X_NR_DIMMS 4
33 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */
35 #define AMD76X_ECC_MODE_STATUS 0x48 /* Mode and status of ECC (32b)
38 * 15:14 SERR enabled: x1=ue 1x=ce
40 * 12 diag: disabled, enabled
41 * 11:10 mode: dis, EC, ECC, ECC+scrub
42 * 9:8 status: x1=ue 1x=ce
47 #define AMD76X_DRAM_MODE_STATUS 0x58 /* DRAM Mode and status (32b)
49 * 31:26 clock disable 5 - 0
52 * 23 mode register service
53 * 22:21 suspend to RAM
54 * 20 burst refresh enable
57 * 17:16 cycles-per-refresh
59 * 7:0 x4 mode enable 7 - 0
62 #define AMD76X_MEM_BASE_ADDR 0xC0 /* Memory base address (8 x 32b)
64 * 31:23 chip-select base
66 * 15:7 chip-select mask
69 * 0 chip-select enable
72 struct amd76x_error_info {
81 struct amd76x_dev_info {
85 static const struct amd76x_dev_info amd76x_devs[] = {
95 * amd76x_get_error_info - fetch error information
96 * @mci: Memory controller
97 * @info: Info to fill in
99 * Fetch and store the AMD76x ECC status. Clear pending status
100 * on the chip so that further errors will be reported
102 static void amd76x_get_error_info(struct mem_ctl_info *mci,
103 struct amd76x_error_info *info)
105 pci_read_config_dword(mci->pdev, AMD76X_ECC_MODE_STATUS,
106 &info->ecc_mode_status);
108 if (info->ecc_mode_status & BIT(8))
109 pci_write_bits32(mci->pdev, AMD76X_ECC_MODE_STATUS,
110 (u32) BIT(8), (u32) BIT(8));
112 if (info->ecc_mode_status & BIT(9))
113 pci_write_bits32(mci->pdev, AMD76X_ECC_MODE_STATUS,
114 (u32) BIT(9), (u32) BIT(9));
118 * amd76x_process_error_info - Error check
119 * @mci: Memory controller
120 * @info: Previously fetched information from chip
121 * @handle_errors: 1 if we should do recovery
123 * Process the chip state and decide if an error has occurred.
124 * A return of 1 indicates an error. Also if handle_errors is true
125 * then attempt to handle and clean up after the error
127 static int amd76x_process_error_info(struct mem_ctl_info *mci,
128 struct amd76x_error_info *info, int handle_errors)
136 * Check for an uncorrectable error
138 if (info->ecc_mode_status & BIT(8)) {
142 row = (info->ecc_mode_status >> 4) & 0xf;
143 edac_mc_handle_ue(mci, mci->csrows[row].first_page, 0,
149 * Check for a correctable error
151 if (info->ecc_mode_status & BIT(9)) {
155 row = info->ecc_mode_status & 0xf;
156 edac_mc_handle_ce(mci, mci->csrows[row].first_page, 0,
157 0, row, 0, mci->ctl_name);
165 * amd76x_check - Poll the controller
166 * @mci: Memory controller
168 * Called by the poll handlers this function reads the status
169 * from the controller and checks for errors.
171 static void amd76x_check(struct mem_ctl_info *mci)
173 struct amd76x_error_info info;
174 debugf3("%s()\n", __func__);
175 amd76x_get_error_info(mci, &info);
176 amd76x_process_error_info(mci, &info, 1);
180 * amd76x_probe1 - Perform set up for detected device
181 * @pdev; PCI device detected
182 * @dev_idx: Device type index
184 * We have found an AMD76x and now need to set up the memory
185 * controller status reporting. We configure and set up the
186 * memory controller reporting and claim the device.
188 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
192 struct mem_ctl_info *mci = NULL;
193 enum edac_type ems_modes[] = {
201 struct amd76x_error_info discard;
203 debugf0("%s()\n", __func__);
204 pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
205 ems_mode = (ems >> 10) & 0x3;
206 mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS);
213 debugf0("%s(): mci = %p\n", __func__, mci);
215 mci->mtype_cap = MEM_FLAG_RDDR;
216 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
217 mci->edac_cap = ems_mode ?
218 (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
219 mci->mod_name = EDAC_MOD_STR;
220 mci->mod_ver = "$Revision: 1.4.2.5 $";
221 mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
222 mci->edac_check = amd76x_check;
223 mci->ctl_page_to_phys = NULL;
225 for (index = 0; index < mci->nr_csrows; index++) {
226 struct csrow_info *csrow = &mci->csrows[index];
232 /* find the DRAM Chip Select Base address and mask */
233 pci_read_config_dword(mci->pdev,
234 AMD76X_MEM_BASE_ADDR + (index * 4), &mba);
239 mba_base = mba & 0xff800000UL;
240 mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
241 pci_read_config_dword(mci->pdev, AMD76X_DRAM_MODE_STATUS,
243 csrow->first_page = mba_base >> PAGE_SHIFT;
244 csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
245 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
246 csrow->page_mask = mba_mask >> PAGE_SHIFT;
247 csrow->grain = csrow->nr_pages << PAGE_SHIFT;
248 csrow->mtype = MEM_RDDR;
249 csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
250 csrow->edac_mode = ems_modes[ems_mode];
253 amd76x_get_error_info(mci, &discard); /* clear counters */
255 if (edac_mc_add_mc(mci)) {
256 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
260 /* get this far and it's successful */
261 debugf3("%s(): success\n", __func__);
270 /* returns count (>= 0), or negative on error */
271 static int __devinit amd76x_init_one(struct pci_dev *pdev,
272 const struct pci_device_id *ent)
274 debugf0("%s()\n", __func__);
276 /* don't need to call pci_device_enable() */
277 return amd76x_probe1(pdev, ent->driver_data);
281 * amd76x_remove_one - driver shutdown
282 * @pdev: PCI device being handed back
284 * Called when the driver is unloaded. Find the matching mci
285 * structure for the device then delete the mci and free the
288 static void __devexit amd76x_remove_one(struct pci_dev *pdev)
290 struct mem_ctl_info *mci;
292 debugf0("%s()\n", __func__);
294 if ((mci = edac_mc_del_mc(pdev)) == NULL)
300 static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = {
302 PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
306 PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
311 } /* 0 terminated list. */
314 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);
316 static struct pci_driver amd76x_driver = {
317 .name = EDAC_MOD_STR,
318 .probe = amd76x_init_one,
319 .remove = __devexit_p(amd76x_remove_one),
320 .id_table = amd76x_pci_tbl,
323 static int __init amd76x_init(void)
325 return pci_register_driver(&amd76x_driver);
328 static void __exit amd76x_exit(void)
330 pci_unregister_driver(&amd76x_driver);
333 module_init(amd76x_init);
334 module_exit(amd76x_exit);
336 MODULE_LICENSE("GPL");
337 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
338 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");