2 * Intel 3200/3210 Memory Controller kernel module
3 * Copyright (C) 2008-2009 Akamai Technologies, Inc.
4 * Portions by Hitoshi Mitake <h.mitake@gmail.com>.
6 * This file may be distributed under the terms of the
7 * GNU General Public License.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/pci.h>
13 #include <linux/pci_ids.h>
14 #include <linux/edac.h>
16 #include "edac_module.h"
18 #include <linux/io-64-nonatomic-lo-hi.h>
20 #define EDAC_MOD_STR "i3200_edac"
22 #define PCI_DEVICE_ID_INTEL_3200_HB 0x29f0
26 #define I3200_RANKS_PER_CHANNEL 4
27 #define I3200_CHANNELS 2
29 /* Intel 3200 register addresses - device 0 function 0 - DRAM Controller */
31 #define I3200_MCHBAR_LOW 0x48 /* MCH Memory Mapped Register BAR */
32 #define I3200_MCHBAR_HIGH 0x4c
33 #define I3200_MCHBAR_MASK 0xfffffc000ULL /* bits 35:14 */
34 #define I3200_MMR_WINDOW_SIZE 16384
36 #define I3200_TOM 0xa0 /* Top of Memory (16b)
39 * 9:0 total populated physical memory
41 #define I3200_TOM_MASK 0x3ff /* bits 9:0 */
42 #define I3200_TOM_SHIFT 26 /* 64MiB grain */
44 #define I3200_ERRSTS 0xc8 /* Error Status Register (16b)
47 * 14 Isochronous TBWRR Run Behind FIFO Full
49 * 13 Isochronous TBWRR Run Behind FIFO Put
52 * 11 MCH Thermal Sensor Event
53 * for SMI/SCI/SERR (GTSE)
55 * 9 LOCK to non-DRAM Memory Flag (LCKF)
57 * 7 DRAM Throttle Flag (DTF)
59 * 1 Multi-bit DRAM ECC Error Flag (DMERR)
60 * 0 Single-bit DRAM ECC Error Flag (DSERR)
62 #define I3200_ERRSTS_UE 0x0002
63 #define I3200_ERRSTS_CE 0x0001
64 #define I3200_ERRSTS_BITS (I3200_ERRSTS_UE | I3200_ERRSTS_CE)
67 /* Intel MMIO register space - device 0 function 0 - MMR space */
69 #define I3200_C0DRB 0x200 /* Channel 0 DRAM Rank Boundary (16b x 4)
72 * 9:0 Channel 0 DRAM Rank Boundary Address
74 #define I3200_C1DRB 0x600 /* Channel 1 DRAM Rank Boundary (16b x 4) */
75 #define I3200_DRB_MASK 0x3ff /* bits 9:0 */
76 #define I3200_DRB_SHIFT 26 /* 64MiB grain */
78 #define I3200_C0ECCERRLOG 0x280 /* Channel 0 ECC Error Log (64b)
80 * 63:48 Error Column Address (ERRCOL)
81 * 47:32 Error Row Address (ERRROW)
82 * 31:29 Error Bank Address (ERRBANK)
83 * 28:27 Error Rank Address (ERRRANK)
85 * 23:16 Error Syndrome (ERRSYND)
87 * 1 Multiple Bit Error Status (MERRSTS)
88 * 0 Correctable Error Status (CERRSTS)
90 #define I3200_C1ECCERRLOG 0x680 /* Chan 1 ECC Error Log (64b) */
91 #define I3200_ECCERRLOG_CE 0x1
92 #define I3200_ECCERRLOG_UE 0x2
93 #define I3200_ECCERRLOG_RANK_BITS 0x18000000
94 #define I3200_ECCERRLOG_RANK_SHIFT 27
95 #define I3200_ECCERRLOG_SYNDROME_BITS 0xff0000
96 #define I3200_ECCERRLOG_SYNDROME_SHIFT 16
97 #define I3200_CAPID0 0xe0 /* P.95 of spec for details */
100 void __iomem *window;
103 static int nr_channels;
105 static int how_many_channels(struct pci_dev *pdev)
109 unsigned char capid0_8b; /* 8th byte of CAPID0 */
111 pci_read_config_byte(pdev, I3200_CAPID0 + 8, &capid0_8b);
113 if (capid0_8b & 0x20) { /* check DCD: Dual Channel Disable */
114 edac_dbg(0, "In single channel mode\n");
117 edac_dbg(0, "In dual channel mode\n");
121 if (capid0_8b & 0x10) /* check if both channels are filled */
122 edac_dbg(0, "2 DIMMS per channel disabled\n");
124 edac_dbg(0, "2 DIMMS per channel enabled\n");
129 static unsigned long eccerrlog_syndrome(u64 log)
131 return (log & I3200_ECCERRLOG_SYNDROME_BITS) >>
132 I3200_ECCERRLOG_SYNDROME_SHIFT;
135 static int eccerrlog_row(int channel, u64 log)
137 u64 rank = ((log & I3200_ECCERRLOG_RANK_BITS) >>
138 I3200_ECCERRLOG_RANK_SHIFT);
139 return rank | (channel * I3200_RANKS_PER_CHANNEL);
146 struct i3200_dev_info {
147 const char *ctl_name;
150 struct i3200_error_info {
153 u64 eccerrlog[I3200_CHANNELS];
156 static const struct i3200_dev_info i3200_devs[] = {
162 static struct pci_dev *mci_pdev;
163 static int i3200_registered = 1;
166 static void i3200_clear_error_info(struct mem_ctl_info *mci)
168 struct pci_dev *pdev;
170 pdev = to_pci_dev(mci->pdev);
173 * Clear any error bits.
174 * (Yes, we really clear bits by writing 1 to them.)
176 pci_write_bits16(pdev, I3200_ERRSTS, I3200_ERRSTS_BITS,
180 static void i3200_get_and_clear_error_info(struct mem_ctl_info *mci,
181 struct i3200_error_info *info)
183 struct pci_dev *pdev;
184 struct i3200_priv *priv = mci->pvt_info;
185 void __iomem *window = priv->window;
187 pdev = to_pci_dev(mci->pdev);
190 * This is a mess because there is no atomic way to read all the
191 * registers at once and the registers can transition from CE being
194 pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts);
195 if (!(info->errsts & I3200_ERRSTS_BITS))
198 info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
199 if (nr_channels == 2)
200 info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
202 pci_read_config_word(pdev, I3200_ERRSTS, &info->errsts2);
205 * If the error is the same for both reads then the first set
206 * of reads is valid. If there is a change then there is a CE
207 * with no info and the second set of reads is valid and
210 if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) {
211 info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
212 if (nr_channels == 2)
213 info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
216 i3200_clear_error_info(mci);
219 static void i3200_process_error_info(struct mem_ctl_info *mci,
220 struct i3200_error_info *info)
225 if (!(info->errsts & I3200_ERRSTS_BITS))
228 if ((info->errsts ^ info->errsts2) & I3200_ERRSTS_BITS) {
229 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
230 -1, -1, -1, "UE overwrote CE", "");
231 info->errsts = info->errsts2;
234 for (channel = 0; channel < nr_channels; channel++) {
235 log = info->eccerrlog[channel];
236 if (log & I3200_ECCERRLOG_UE) {
237 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
239 eccerrlog_row(channel, log),
242 } else if (log & I3200_ECCERRLOG_CE) {
243 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
244 0, 0, eccerrlog_syndrome(log),
245 eccerrlog_row(channel, log),
252 static void i3200_check(struct mem_ctl_info *mci)
254 struct i3200_error_info info;
256 i3200_get_and_clear_error_info(mci, &info);
257 i3200_process_error_info(mci, &info);
260 static void __iomem *i3200_map_mchbar(struct pci_dev *pdev)
269 void __iomem *window;
271 pci_read_config_dword(pdev, I3200_MCHBAR_LOW, &u.mchbar_low);
272 pci_read_config_dword(pdev, I3200_MCHBAR_HIGH, &u.mchbar_high);
273 u.mchbar &= I3200_MCHBAR_MASK;
275 if (u.mchbar != (resource_size_t)u.mchbar) {
277 "i3200: mmio space beyond accessible range (0x%llx)\n",
278 (unsigned long long)u.mchbar);
282 window = ioremap(u.mchbar, I3200_MMR_WINDOW_SIZE);
284 printk(KERN_ERR "i3200: cannot map mmio space at 0x%llx\n",
285 (unsigned long long)u.mchbar);
291 static void i3200_get_drbs(void __iomem *window,
292 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
296 for (i = 0; i < I3200_RANKS_PER_CHANNEL; i++) {
297 drbs[0][i] = readw(window + I3200_C0DRB + 2*i) & I3200_DRB_MASK;
298 drbs[1][i] = readw(window + I3200_C1DRB + 2*i) & I3200_DRB_MASK;
300 edac_dbg(0, "drb[0][%d] = %d, drb[1][%d] = %d\n", i, drbs[0][i], i, drbs[1][i]);
304 static bool i3200_is_stacked(struct pci_dev *pdev,
305 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
309 pci_read_config_word(pdev, I3200_TOM, &tom);
310 tom &= I3200_TOM_MASK;
312 return drbs[I3200_CHANNELS - 1][I3200_RANKS_PER_CHANNEL - 1] == tom;
315 static unsigned long drb_to_nr_pages(
316 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL], bool stacked,
317 int channel, int rank)
321 n = drbs[channel][rank];
326 n -= drbs[channel][rank - 1];
327 if (stacked && (channel == 1) &&
328 drbs[channel][rank] == drbs[channel][I3200_RANKS_PER_CHANNEL - 1])
329 n -= drbs[0][I3200_RANKS_PER_CHANNEL - 1];
331 n <<= (I3200_DRB_SHIFT - PAGE_SHIFT);
335 static int i3200_probe1(struct pci_dev *pdev, int dev_idx)
339 struct mem_ctl_info *mci = NULL;
340 struct edac_mc_layer layers[2];
341 u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL];
343 void __iomem *window;
344 struct i3200_priv *priv;
346 edac_dbg(0, "MC:\n");
348 window = i3200_map_mchbar(pdev);
352 i3200_get_drbs(window, drbs);
353 nr_channels = how_many_channels(pdev);
355 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
356 layers[0].size = I3200_DIMMS;
357 layers[0].is_virt_csrow = true;
358 layers[1].type = EDAC_MC_LAYER_CHANNEL;
359 layers[1].size = nr_channels;
360 layers[1].is_virt_csrow = false;
361 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
362 sizeof(struct i3200_priv));
366 edac_dbg(3, "MC: init mci\n");
368 mci->pdev = &pdev->dev;
369 mci->mtype_cap = MEM_FLAG_DDR2;
371 mci->edac_ctl_cap = EDAC_FLAG_SECDED;
372 mci->edac_cap = EDAC_FLAG_SECDED;
374 mci->mod_name = EDAC_MOD_STR;
375 mci->ctl_name = i3200_devs[dev_idx].ctl_name;
376 mci->dev_name = pci_name(pdev);
377 mci->edac_check = i3200_check;
378 mci->ctl_page_to_phys = NULL;
379 priv = mci->pvt_info;
380 priv->window = window;
382 stacked = i3200_is_stacked(pdev, drbs);
385 * The dram rank boundary (DRB) reg values are boundary addresses
386 * for each DRAM rank with a granularity of 64MB. DRB regs are
387 * cumulative; the last one will contain the total memory
388 * contained in all ranks.
390 for (i = 0; i < I3200_DIMMS; i++) {
391 unsigned long nr_pages;
393 for (j = 0; j < nr_channels; j++) {
394 struct dimm_info *dimm = edac_get_dimm(mci, i, j, 0);
396 nr_pages = drb_to_nr_pages(drbs, stacked, j, i);
400 edac_dbg(0, "csrow %d, channel %d%s, size = %ld MiB\n", i, j,
401 stacked ? " (stacked)" : "", PAGES_TO_MiB(nr_pages));
403 dimm->nr_pages = nr_pages;
404 dimm->grain = nr_pages << PAGE_SHIFT;
405 dimm->mtype = MEM_DDR2;
406 dimm->dtype = DEV_UNKNOWN;
407 dimm->edac_mode = EDAC_UNKNOWN;
411 i3200_clear_error_info(mci);
414 if (edac_mc_add_mc(mci)) {
415 edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
419 /* get this far and it's successful */
420 edac_dbg(3, "MC: success\n");
431 static int i3200_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
435 edac_dbg(0, "MC:\n");
437 if (pci_enable_device(pdev) < 0)
440 rc = i3200_probe1(pdev, ent->driver_data);
442 mci_pdev = pci_dev_get(pdev);
447 static void i3200_remove_one(struct pci_dev *pdev)
449 struct mem_ctl_info *mci;
450 struct i3200_priv *priv;
454 mci = edac_mc_del_mc(&pdev->dev);
458 priv = mci->pvt_info;
459 iounmap(priv->window);
463 pci_disable_device(pdev);
466 static const struct pci_device_id i3200_pci_tbl[] = {
468 PCI_VEND_DEV(INTEL, 3200_HB), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
472 } /* 0 terminated list. */
475 MODULE_DEVICE_TABLE(pci, i3200_pci_tbl);
477 static struct pci_driver i3200_driver = {
478 .name = EDAC_MOD_STR,
479 .probe = i3200_init_one,
480 .remove = i3200_remove_one,
481 .id_table = i3200_pci_tbl,
484 static int __init i3200_init(void)
488 edac_dbg(3, "MC:\n");
490 /* Ensure that the OPSTATE is set correctly for POLL or NMI */
493 pci_rc = pci_register_driver(&i3200_driver);
498 i3200_registered = 0;
499 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
500 PCI_DEVICE_ID_INTEL_3200_HB, NULL);
502 edac_dbg(0, "i3200 pci_get_device fail\n");
507 pci_rc = i3200_init_one(mci_pdev, i3200_pci_tbl);
509 edac_dbg(0, "i3200 init fail\n");
518 pci_unregister_driver(&i3200_driver);
521 pci_dev_put(mci_pdev);
526 static void __exit i3200_exit(void)
528 edac_dbg(3, "MC:\n");
530 pci_unregister_driver(&i3200_driver);
531 if (!i3200_registered) {
532 i3200_remove_one(mci_pdev);
533 pci_dev_put(mci_pdev);
537 module_init(i3200_init);
538 module_exit(i3200_exit);
540 MODULE_LICENSE("GPL");
541 MODULE_AUTHOR("Akamai Technologies, Inc.");
542 MODULE_DESCRIPTION("MC support for Intel 3200 memory hub controllers");
544 module_param(edac_op_state, int, 0444);
545 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");