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/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_core.h"
22 #define AMD76X_REVISION " Ver: 2.0.2"
23 #define EDAC_MOD_STR "amd76x_edac"
25 #define amd76x_printk(level, fmt, arg...) \
26 edac_printk(level, "amd76x", fmt, ##arg)
28 #define amd76x_mc_printk(mci, level, fmt, arg...) \
29 edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)
31 #define AMD76X_NR_CSROWS 8
32 #define AMD76X_NR_DIMMS 4
34 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */
36 #define AMD76X_ECC_MODE_STATUS 0x48 /* Mode and status of ECC (32b)
39 * 15:14 SERR enabled: x1=ue 1x=ce
41 * 12 diag: disabled, enabled
42 * 11:10 mode: dis, EC, ECC, ECC+scrub
43 * 9:8 status: x1=ue 1x=ce
48 #define AMD76X_DRAM_MODE_STATUS 0x58 /* DRAM Mode and status (32b)
50 * 31:26 clock disable 5 - 0
53 * 23 mode register service
54 * 22:21 suspend to RAM
55 * 20 burst refresh enable
58 * 17:16 cycles-per-refresh
60 * 7:0 x4 mode enable 7 - 0
63 #define AMD76X_MEM_BASE_ADDR 0xC0 /* Memory base address (8 x 32b)
65 * 31:23 chip-select base
67 * 15:7 chip-select mask
70 * 0 chip-select enable
73 struct amd76x_error_info {
82 struct amd76x_dev_info {
86 static const struct amd76x_dev_info amd76x_devs[] = {
88 .ctl_name = "AMD761"},
90 .ctl_name = "AMD762"},
93 static struct edac_pci_ctl_info *amd76x_pci;
96 * amd76x_get_error_info - fetch error information
97 * @mci: Memory controller
98 * @info: Info to fill in
100 * Fetch and store the AMD76x ECC status. Clear pending status
101 * on the chip so that further errors will be reported
103 static void amd76x_get_error_info(struct mem_ctl_info *mci,
104 struct amd76x_error_info *info)
106 struct pci_dev *pdev;
108 pdev = to_pci_dev(mci->pdev);
109 pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS,
110 &info->ecc_mode_status);
112 if (info->ecc_mode_status & BIT(8))
113 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
114 (u32) BIT(8), (u32) BIT(8));
116 if (info->ecc_mode_status & BIT(9))
117 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
118 (u32) BIT(9), (u32) BIT(9));
122 * amd76x_process_error_info - Error check
123 * @mci: Memory controller
124 * @info: Previously fetched information from chip
125 * @handle_errors: 1 if we should do recovery
127 * Process the chip state and decide if an error has occurred.
128 * A return of 1 indicates an error. Also if handle_errors is true
129 * then attempt to handle and clean up after the error
131 static int amd76x_process_error_info(struct mem_ctl_info *mci,
132 struct amd76x_error_info *info,
141 * Check for an uncorrectable error
143 if (info->ecc_mode_status & BIT(8)) {
147 row = (info->ecc_mode_status >> 4) & 0xf;
148 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
149 mci->csrows[row]->first_page, 0, 0,
156 * Check for a correctable error
158 if (info->ecc_mode_status & BIT(9)) {
162 row = info->ecc_mode_status & 0xf;
163 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
164 mci->csrows[row]->first_page, 0, 0,
174 * amd76x_check - Poll the controller
175 * @mci: Memory controller
177 * Called by the poll handlers this function reads the status
178 * from the controller and checks for errors.
180 static void amd76x_check(struct mem_ctl_info *mci)
182 struct amd76x_error_info info;
184 amd76x_get_error_info(mci, &info);
185 amd76x_process_error_info(mci, &info, 1);
188 static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
189 enum edac_type edac_mode)
191 struct csrow_info *csrow;
192 struct dimm_info *dimm;
193 u32 mba, mba_base, mba_mask, dms;
196 for (index = 0; index < mci->nr_csrows; index++) {
197 csrow = mci->csrows[index];
198 dimm = csrow->channels[0]->dimm;
200 /* find the DRAM Chip Select Base address and mask */
201 pci_read_config_dword(pdev,
202 AMD76X_MEM_BASE_ADDR + (index * 4), &mba);
207 mba_base = mba & 0xff800000UL;
208 mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
209 pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
210 csrow->first_page = mba_base >> PAGE_SHIFT;
211 dimm->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
212 csrow->last_page = csrow->first_page + dimm->nr_pages - 1;
213 csrow->page_mask = mba_mask >> PAGE_SHIFT;
214 dimm->grain = dimm->nr_pages << PAGE_SHIFT;
215 dimm->mtype = MEM_RDDR;
216 dimm->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
217 dimm->edac_mode = edac_mode;
222 * amd76x_probe1 - Perform set up for detected device
223 * @pdev; PCI device detected
224 * @dev_idx: Device type index
226 * We have found an AMD76x and now need to set up the memory
227 * controller status reporting. We configure and set up the
228 * memory controller reporting and claim the device.
230 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
232 static const enum edac_type ems_modes[] = {
238 struct mem_ctl_info *mci;
239 struct edac_mc_layer layers[2];
242 struct amd76x_error_info discard;
245 pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
246 ems_mode = (ems >> 10) & 0x3;
248 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
249 layers[0].size = AMD76X_NR_CSROWS;
250 layers[0].is_virt_csrow = true;
251 layers[1].type = EDAC_MC_LAYER_CHANNEL;
253 layers[1].is_virt_csrow = false;
254 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
259 edac_dbg(0, "mci = %p\n", mci);
260 mci->pdev = &pdev->dev;
261 mci->mtype_cap = MEM_FLAG_RDDR;
262 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
263 mci->edac_cap = ems_mode ?
264 (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
265 mci->mod_name = EDAC_MOD_STR;
266 mci->mod_ver = AMD76X_REVISION;
267 mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
268 mci->dev_name = pci_name(pdev);
269 mci->edac_check = amd76x_check;
270 mci->ctl_page_to_phys = NULL;
272 amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
273 amd76x_get_error_info(mci, &discard); /* clear counters */
275 /* Here we assume that we will never see multiple instances of this
276 * type of memory controller. The ID is therefore hardcoded to 0.
278 if (edac_mc_add_mc(mci)) {
279 edac_dbg(3, "failed edac_mc_add_mc()\n");
283 /* allocating generic PCI control info */
284 amd76x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
287 "%s(): Unable to create PCI control\n",
290 "%s(): PCI error report via EDAC not setup\n",
294 /* get this far and it's successful */
295 edac_dbg(3, "success\n");
303 /* returns count (>= 0), or negative on error */
304 static int __devinit amd76x_init_one(struct pci_dev *pdev,
305 const struct pci_device_id *ent)
309 /* don't need to call pci_enable_device() */
310 return amd76x_probe1(pdev, ent->driver_data);
314 * amd76x_remove_one - driver shutdown
315 * @pdev: PCI device being handed back
317 * Called when the driver is unloaded. Find the matching mci
318 * structure for the device then delete the mci and free the
321 static void __devexit amd76x_remove_one(struct pci_dev *pdev)
323 struct mem_ctl_info *mci;
328 edac_pci_release_generic_ctl(amd76x_pci);
330 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
336 static DEFINE_PCI_DEVICE_TABLE(amd76x_pci_tbl) = {
338 PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
341 PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
345 } /* 0 terminated list. */
348 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);
350 static struct pci_driver amd76x_driver = {
351 .name = EDAC_MOD_STR,
352 .probe = amd76x_init_one,
353 .remove = __devexit_p(amd76x_remove_one),
354 .id_table = amd76x_pci_tbl,
357 static int __init amd76x_init(void)
359 /* Ensure that the OPSTATE is set correctly for POLL or NMI */
362 return pci_register_driver(&amd76x_driver);
365 static void __exit amd76x_exit(void)
367 pci_unregister_driver(&amd76x_driver);
370 module_init(amd76x_init);
371 module_exit(amd76x_exit);
373 MODULE_LICENSE("GPL");
374 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
375 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");
377 module_param(edac_op_state, int, 0444);
378 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");