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5c770755 CM |
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. */ | |
47 | struct platform_device *mshim_pdev[TILE_MAX_MSHIMS]; | |
48 | ||
49 | struct 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 | ||
58 | static 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->dev, "ECC CE err on node %d\n", priv->node); | |
73 | priv->ce_count = mem_error.sbe_count; | |
74 | edac_mc_handle_ce(mci, 0, 0, 0, 0, 0, mci->ctl_name); | |
75 | } | |
76 | } | |
77 | ||
78 | /* | |
79 | * Initialize the 'csrows' table within the mci control structure with the | |
80 | * addressing of memory. | |
81 | */ | |
82 | static int __devinit tile_edac_init_csrows(struct mem_ctl_info *mci) | |
83 | { | |
84 | struct csrow_info *csrow = &mci->csrows[0]; | |
85 | struct tile_edac_priv *priv = mci->pvt_info; | |
86 | struct mshim_mem_info mem_info; | |
084a4fcc | 87 | struct dimm_info *dimm = csrow->channels[0].dimm; |
5c770755 CM |
88 | |
89 | if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_info, | |
90 | sizeof(struct mshim_mem_info), MSHIM_MEM_INFO_OFF) != | |
91 | sizeof(struct mshim_mem_info)) { | |
92 | pr_err(DRV_NAME ": MSHIM_MEM_INFO_OFF pread failure.\n"); | |
93 | return -1; | |
94 | } | |
95 | ||
96 | if (mem_info.mem_ecc) | |
084a4fcc | 97 | dimm->edac_mode = EDAC_SECDED; |
5c770755 | 98 | else |
084a4fcc | 99 | dimm->edac_mode = EDAC_NONE; |
5c770755 CM |
100 | switch (mem_info.mem_type) { |
101 | case DDR2: | |
084a4fcc | 102 | dimm->mtype = MEM_DDR2; |
5c770755 CM |
103 | break; |
104 | ||
105 | case DDR3: | |
084a4fcc | 106 | dimm->mtype = MEM_DDR3; |
5c770755 CM |
107 | break; |
108 | ||
109 | default: | |
110 | return -1; | |
111 | } | |
112 | ||
5c770755 | 113 | csrow->nr_pages = mem_info.mem_size >> PAGE_SHIFT; |
084a4fcc MCC |
114 | dimm->grain = TILE_EDAC_ERROR_GRAIN; |
115 | dimm->dtype = DEV_UNKNOWN; | |
5c770755 CM |
116 | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static int __devinit tile_edac_mc_probe(struct platform_device *pdev) | |
121 | { | |
122 | char hv_file[32]; | |
123 | int hv_devhdl; | |
124 | struct mem_ctl_info *mci; | |
125 | struct tile_edac_priv *priv; | |
126 | int rc; | |
127 | ||
128 | sprintf(hv_file, "mshim/%d", pdev->id); | |
129 | hv_devhdl = hv_dev_open((HV_VirtAddr)hv_file, 0); | |
130 | if (hv_devhdl < 0) | |
131 | return -EINVAL; | |
132 | ||
133 | /* A TILE MC has a single channel and one chip-select row. */ | |
134 | mci = edac_mc_alloc(sizeof(struct tile_edac_priv), | |
135 | TILE_EDAC_NR_CSROWS, TILE_EDAC_NR_CHANS, pdev->id); | |
136 | if (mci == NULL) | |
137 | return -ENOMEM; | |
138 | priv = mci->pvt_info; | |
139 | priv->node = pdev->id; | |
140 | priv->hv_devhdl = hv_devhdl; | |
141 | ||
142 | mci->dev = &pdev->dev; | |
143 | mci->mtype_cap = MEM_FLAG_DDR2; | |
144 | mci->edac_ctl_cap = EDAC_FLAG_SECDED; | |
145 | ||
146 | mci->mod_name = DRV_NAME; | |
e2e110d7 CM |
147 | #ifdef __tilegx__ |
148 | mci->ctl_name = "TILEGx_Memory_Controller"; | |
149 | #else | |
5c770755 | 150 | mci->ctl_name = "TILEPro_Memory_Controller"; |
e2e110d7 | 151 | #endif |
5c770755 CM |
152 | mci->dev_name = dev_name(&pdev->dev); |
153 | mci->edac_check = tile_edac_check; | |
154 | ||
155 | /* | |
156 | * Initialize the MC control structure 'csrows' table | |
157 | * with the mapping and control information. | |
158 | */ | |
159 | if (tile_edac_init_csrows(mci)) { | |
160 | /* No csrows found. */ | |
161 | mci->edac_cap = EDAC_FLAG_NONE; | |
162 | } else { | |
163 | mci->edac_cap = EDAC_FLAG_SECDED; | |
164 | } | |
165 | ||
166 | platform_set_drvdata(pdev, mci); | |
167 | ||
168 | /* Register with EDAC core */ | |
169 | rc = edac_mc_add_mc(mci); | |
170 | if (rc) { | |
171 | dev_err(&pdev->dev, "failed to register with EDAC core\n"); | |
172 | edac_mc_free(mci); | |
173 | return rc; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static int __devexit tile_edac_mc_remove(struct platform_device *pdev) | |
180 | { | |
181 | struct mem_ctl_info *mci = platform_get_drvdata(pdev); | |
182 | ||
183 | edac_mc_del_mc(&pdev->dev); | |
184 | if (mci) | |
185 | edac_mc_free(mci); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static struct platform_driver tile_edac_mc_driver = { | |
190 | .driver = { | |
191 | .name = DRV_NAME, | |
192 | .owner = THIS_MODULE, | |
193 | }, | |
194 | .probe = tile_edac_mc_probe, | |
195 | .remove = __devexit_p(tile_edac_mc_remove), | |
196 | }; | |
197 | ||
198 | /* | |
199 | * Driver init routine. | |
200 | */ | |
201 | static int __init tile_edac_init(void) | |
202 | { | |
203 | char hv_file[32]; | |
204 | struct platform_device *pdev; | |
205 | int i, err, num = 0; | |
206 | ||
207 | /* Only support POLL mode. */ | |
208 | edac_op_state = EDAC_OPSTATE_POLL; | |
209 | ||
210 | err = platform_driver_register(&tile_edac_mc_driver); | |
211 | if (err) | |
212 | return err; | |
213 | ||
214 | for (i = 0; i < TILE_MAX_MSHIMS; i++) { | |
215 | /* | |
216 | * Not all memory controllers are configured such as in the | |
217 | * case of a simulator. So we register only those mshims | |
218 | * that are configured by the hypervisor. | |
219 | */ | |
220 | sprintf(hv_file, "mshim/%d", i); | |
221 | if (hv_dev_open((HV_VirtAddr)hv_file, 0) < 0) | |
222 | continue; | |
223 | ||
224 | pdev = platform_device_register_simple(DRV_NAME, i, NULL, 0); | |
225 | if (IS_ERR(pdev)) | |
226 | continue; | |
227 | mshim_pdev[i] = pdev; | |
228 | num++; | |
229 | } | |
230 | ||
231 | if (num == 0) { | |
232 | platform_driver_unregister(&tile_edac_mc_driver); | |
233 | return -ENODEV; | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Driver cleanup routine. | |
240 | */ | |
241 | static void __exit tile_edac_exit(void) | |
242 | { | |
243 | int i; | |
244 | ||
245 | for (i = 0; i < TILE_MAX_MSHIMS; i++) { | |
246 | struct platform_device *pdev = mshim_pdev[i]; | |
247 | if (!pdev) | |
248 | continue; | |
249 | ||
250 | platform_set_drvdata(pdev, NULL); | |
251 | platform_device_unregister(pdev); | |
252 | } | |
253 | platform_driver_unregister(&tile_edac_mc_driver); | |
254 | } | |
255 | ||
256 | module_init(tile_edac_init); | |
257 | module_exit(tile_edac_exit); |