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1/*
2 * Copyright 2011 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 * Tilera-specific EDAC driver.
14 *
15 * This source code is derived from the following driver:
16 *
17 * Cell MIC driver for ECC counting
18 *
19 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
20 * <benh@kernel.crashing.org>
21 *
22 */
23
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/platform_device.h>
27#include <linux/io.h>
28#include <linux/uaccess.h>
29#include <linux/edac.h>
30#include <hv/hypervisor.h>
31#include <hv/drv_mshim_intf.h>
32
33#include "edac_core.h"
34
35#define DRV_NAME "tile-edac"
36
37/* Number of cs_rows needed per memory controller on TILEPro. */
38#define TILE_EDAC_NR_CSROWS 1
39
40/* Number of channels per memory controller on TILEPro. */
41#define TILE_EDAC_NR_CHANS 1
42
43/* Granularity of reported error in bytes on TILEPro. */
44#define TILE_EDAC_ERROR_GRAIN 8
45
46/* TILE processor has multiple independent memory controllers. */
47struct platform_device *mshim_pdev[TILE_MAX_MSHIMS];
48
49struct tile_edac_priv {
50 int hv_devhdl; /* Hypervisor device handle. */
51 int node; /* Memory controller instance #. */
52 unsigned int ce_count; /*
53 * Correctable-error counter
54 * kept by the driver.
55 */
56};
57
58static void tile_edac_check(struct mem_ctl_info *mci)
59{
60 struct tile_edac_priv *priv = mci->pvt_info;
61 struct mshim_mem_error mem_error;
62
63 if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_error,
64 sizeof(struct mshim_mem_error), MSHIM_MEM_ERROR_OFF) !=
65 sizeof(struct mshim_mem_error)) {
66 pr_err(DRV_NAME ": MSHIM_MEM_ERROR_OFF pread failure.\n");
67 return;
68 }
69
70 /* Check if the current error count is different from the saved one. */
71 if (mem_error.sbe_count != priv->ce_count) {
72 dev_dbg(mci->pdev, "ECC CE err on node %d\n", priv->node);
73 priv->ce_count = mem_error.sbe_count;
74 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
75 0, 0, 0,
76 0, 0, -1,
77 mci->ctl_name, "");
78 }
79}
80
81/*
82 * Initialize the 'csrows' table within the mci control structure with the
83 * addressing of memory.
84 */
85static int tile_edac_init_csrows(struct mem_ctl_info *mci)
86{
87 struct csrow_info *csrow = mci->csrows[0];
88 struct tile_edac_priv *priv = mci->pvt_info;
89 struct mshim_mem_info mem_info;
90 struct dimm_info *dimm = csrow->channels[0]->dimm;
91
92 if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_info,
93 sizeof(struct mshim_mem_info), MSHIM_MEM_INFO_OFF) !=
94 sizeof(struct mshim_mem_info)) {
95 pr_err(DRV_NAME ": MSHIM_MEM_INFO_OFF pread failure.\n");
96 return -1;
97 }
98
99 if (mem_info.mem_ecc)
100 dimm->edac_mode = EDAC_SECDED;
101 else
102 dimm->edac_mode = EDAC_NONE;
103 switch (mem_info.mem_type) {
104 case DDR2:
105 dimm->mtype = MEM_DDR2;
106 break;
107
108 case DDR3:
109 dimm->mtype = MEM_DDR3;
110 break;
111
112 default:
113 return -1;
114 }
115
116 dimm->nr_pages = mem_info.mem_size >> PAGE_SHIFT;
117 dimm->grain = TILE_EDAC_ERROR_GRAIN;
118 dimm->dtype = DEV_UNKNOWN;
119
120 return 0;
121}
122
123static int tile_edac_mc_probe(struct platform_device *pdev)
124{
125 char hv_file[32];
126 int hv_devhdl;
127 struct mem_ctl_info *mci;
128 struct edac_mc_layer layers[2];
129 struct tile_edac_priv *priv;
130 int rc;
131
132 sprintf(hv_file, "mshim/%d", pdev->id);
133 hv_devhdl = hv_dev_open((HV_VirtAddr)hv_file, 0);
134 if (hv_devhdl < 0)
135 return -EINVAL;
136
137 /* A TILE MC has a single channel and one chip-select row. */
138 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
139 layers[0].size = TILE_EDAC_NR_CSROWS;
140 layers[0].is_virt_csrow = true;
141 layers[1].type = EDAC_MC_LAYER_CHANNEL;
142 layers[1].size = TILE_EDAC_NR_CHANS;
143 layers[1].is_virt_csrow = false;
144 mci = edac_mc_alloc(pdev->id, ARRAY_SIZE(layers), layers,
145 sizeof(struct tile_edac_priv));
146 if (mci == NULL)
147 return -ENOMEM;
148 priv = mci->pvt_info;
149 priv->node = pdev->id;
150 priv->hv_devhdl = hv_devhdl;
151
152 mci->pdev = &pdev->dev;
153 mci->mtype_cap = MEM_FLAG_DDR2;
154 mci->edac_ctl_cap = EDAC_FLAG_SECDED;
155
156 mci->mod_name = DRV_NAME;
157#ifdef __tilegx__
158 mci->ctl_name = "TILEGx_Memory_Controller";
159#else
160 mci->ctl_name = "TILEPro_Memory_Controller";
161#endif
162 mci->dev_name = dev_name(&pdev->dev);
163 mci->edac_check = tile_edac_check;
164
165 /*
166 * Initialize the MC control structure 'csrows' table
167 * with the mapping and control information.
168 */
169 if (tile_edac_init_csrows(mci)) {
170 /* No csrows found. */
171 mci->edac_cap = EDAC_FLAG_NONE;
172 } else {
173 mci->edac_cap = EDAC_FLAG_SECDED;
174 }
175
176 platform_set_drvdata(pdev, mci);
177
178 /* Register with EDAC core */
179 rc = edac_mc_add_mc(mci);
180 if (rc) {
181 dev_err(&pdev->dev, "failed to register with EDAC core\n");
182 edac_mc_free(mci);
183 return rc;
184 }
185
186 return 0;
187}
188
189static int tile_edac_mc_remove(struct platform_device *pdev)
190{
191 struct mem_ctl_info *mci = platform_get_drvdata(pdev);
192
193 edac_mc_del_mc(&pdev->dev);
194 if (mci)
195 edac_mc_free(mci);
196 return 0;
197}
198
199static struct platform_driver tile_edac_mc_driver = {
200 .driver = {
201 .name = DRV_NAME,
202 .owner = THIS_MODULE,
203 },
204 .probe = tile_edac_mc_probe,
205 .remove = tile_edac_mc_remove,
206};
207
208/*
209 * Driver init routine.
210 */
211static int __init tile_edac_init(void)
212{
213 char hv_file[32];
214 struct platform_device *pdev;
215 int i, err, num = 0;
216
217 /* Only support POLL mode. */
218 edac_op_state = EDAC_OPSTATE_POLL;
219
220 err = platform_driver_register(&tile_edac_mc_driver);
221 if (err)
222 return err;
223
224 for (i = 0; i < TILE_MAX_MSHIMS; i++) {
225 /*
226 * Not all memory controllers are configured such as in the
227 * case of a simulator. So we register only those mshims
228 * that are configured by the hypervisor.
229 */
230 sprintf(hv_file, "mshim/%d", i);
231 if (hv_dev_open((HV_VirtAddr)hv_file, 0) < 0)
232 continue;
233
234 pdev = platform_device_register_simple(DRV_NAME, i, NULL, 0);
235 if (IS_ERR(pdev))
236 continue;
237 mshim_pdev[i] = pdev;
238 num++;
239 }
240
241 if (num == 0) {
242 platform_driver_unregister(&tile_edac_mc_driver);
243 return -ENODEV;
244 }
245 return 0;
246}
247
248/*
249 * Driver cleanup routine.
250 */
251static void __exit tile_edac_exit(void)
252{
253 int i;
254
255 for (i = 0; i < TILE_MAX_MSHIMS; i++) {
256 struct platform_device *pdev = mshim_pdev[i];
257 if (!pdev)
258 continue;
259
260 platform_device_unregister(pdev);
261 }
262 platform_driver_unregister(&tile_edac_mc_driver);
263}
264
265module_init(tile_edac_init);
266module_exit(tile_edac_exit);