1 /*
2 * Cell MIC driver for ECC counting
3 *
4 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
6 *
7 * This file may be distributed under the terms of the
8 * GNU General Public License.
9 */
10 #undef DEBUG
11
12 #include <linux/edac.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/platform_device.h>
16 #include <linux/stop_machine.h>
17 #include <linux/io.h>
18 #include <linux/of_address.h>
19 #include <asm/machdep.h>
20 #include <asm/cell-regs.h>
21
22 #include "edac_module.h"
23
24 struct cell_edac_priv
25 {
26 struct cbe_mic_tm_regs __iomem *regs;
27 int node;
28 int chanmask;
29 #ifdef DEBUG
30 u64 prev_fir;
31 #endif
32 };
33
cell_edac_count_ce(struct mem_ctl_info * mci,int chan,u64 ar)34 static void cell_edac_count_ce(struct mem_ctl_info *mci, int chan, u64 ar)
35 {
36 struct cell_edac_priv *priv = mci->pvt_info;
37 struct csrow_info *csrow = mci->csrows[0];
38 unsigned long address, pfn, offset, syndrome;
39
40 dev_dbg(mci->pdev, "ECC CE err on node %d, channel %d, ar = 0x%016llx\n",
41 priv->node, chan, ar);
42
43 /* Address decoding is likely a bit bogus, to dbl check */
44 address = (ar & 0xffffffffe0000000ul) >> 29;
45 if (priv->chanmask == 0x3)
46 address = (address << 1) | chan;
47 pfn = address >> PAGE_SHIFT;
48 offset = address & ~PAGE_MASK;
49 syndrome = (ar & 0x000000001fe00000ul) >> 21;
50
51 /* TODO: Decoding of the error address */
52 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
53 csrow->first_page + pfn, offset, syndrome,
54 0, chan, -1, "", "");
55 }
56
cell_edac_count_ue(struct mem_ctl_info * mci,int chan,u64 ar)57 static void cell_edac_count_ue(struct mem_ctl_info *mci, int chan, u64 ar)
58 {
59 struct cell_edac_priv *priv = mci->pvt_info;
60 struct csrow_info *csrow = mci->csrows[0];
61 unsigned long address, pfn, offset;
62
63 dev_dbg(mci->pdev, "ECC UE err on node %d, channel %d, ar = 0x%016llx\n",
64 priv->node, chan, ar);
65
66 /* Address decoding is likely a bit bogus, to dbl check */
67 address = (ar & 0xffffffffe0000000ul) >> 29;
68 if (priv->chanmask == 0x3)
69 address = (address << 1) | chan;
70 pfn = address >> PAGE_SHIFT;
71 offset = address & ~PAGE_MASK;
72
73 /* TODO: Decoding of the error address */
74 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
75 csrow->first_page + pfn, offset, 0,
76 0, chan, -1, "", "");
77 }
78
cell_edac_check(struct mem_ctl_info * mci)79 static void cell_edac_check(struct mem_ctl_info *mci)
80 {
81 struct cell_edac_priv *priv = mci->pvt_info;
82 u64 fir, addreg, clear = 0;
83
84 fir = in_be64(&priv->regs->mic_fir);
85 #ifdef DEBUG
86 if (fir != priv->prev_fir) {
87 dev_dbg(mci->pdev, "fir change : 0x%016lx\n", fir);
88 priv->prev_fir = fir;
89 }
90 #endif
91 if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_SINGLE_0_ERR)) {
92 addreg = in_be64(&priv->regs->mic_df_ecc_address_0);
93 clear |= CBE_MIC_FIR_ECC_SINGLE_0_RESET;
94 cell_edac_count_ce(mci, 0, addreg);
95 }
96 if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_SINGLE_1_ERR)) {
97 addreg = in_be64(&priv->regs->mic_df_ecc_address_1);
98 clear |= CBE_MIC_FIR_ECC_SINGLE_1_RESET;
99 cell_edac_count_ce(mci, 1, addreg);
100 }
101 if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_MULTI_0_ERR)) {
102 addreg = in_be64(&priv->regs->mic_df_ecc_address_0);
103 clear |= CBE_MIC_FIR_ECC_MULTI_0_RESET;
104 cell_edac_count_ue(mci, 0, addreg);
105 }
106 if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_MULTI_1_ERR)) {
107 addreg = in_be64(&priv->regs->mic_df_ecc_address_1);
108 clear |= CBE_MIC_FIR_ECC_MULTI_1_RESET;
109 cell_edac_count_ue(mci, 1, addreg);
110 }
111
112 /* The procedure for clearing FIR bits is a bit ... weird */
113 if (clear) {
114 fir &= ~(CBE_MIC_FIR_ECC_ERR_MASK | CBE_MIC_FIR_ECC_SET_MASK);
115 fir |= CBE_MIC_FIR_ECC_RESET_MASK;
116 fir &= ~clear;
117 out_be64(&priv->regs->mic_fir, fir);
118 (void)in_be64(&priv->regs->mic_fir);
119
120 mb(); /* sync up */
121 #ifdef DEBUG
122 fir = in_be64(&priv->regs->mic_fir);
123 dev_dbg(mci->pdev, "fir clear : 0x%016lx\n", fir);
124 #endif
125 }
126 }
127
cell_edac_init_csrows(struct mem_ctl_info * mci)128 static void cell_edac_init_csrows(struct mem_ctl_info *mci)
129 {
130 struct csrow_info *csrow = mci->csrows[0];
131 struct dimm_info *dimm;
132 struct cell_edac_priv *priv = mci->pvt_info;
133 struct device_node *np;
134 int j;
135 u32 nr_pages;
136
137 for_each_node_by_name(np, "memory") {
138 struct resource r;
139
140 /* We "know" that the Cell firmware only creates one entry
141 * in the "memory" nodes. If that changes, this code will
142 * need to be adapted.
143 */
144 if (of_address_to_resource(np, 0, &r))
145 continue;
146 if (of_node_to_nid(np) != priv->node)
147 continue;
148 csrow->first_page = r.start >> PAGE_SHIFT;
149 nr_pages = resource_size(&r) >> PAGE_SHIFT;
150 csrow->last_page = csrow->first_page + nr_pages - 1;
151
152 for (j = 0; j < csrow->nr_channels; j++) {
153 dimm = csrow->channels[j]->dimm;
154 dimm->mtype = MEM_XDR;
155 dimm->edac_mode = EDAC_SECDED;
156 dimm->nr_pages = nr_pages / csrow->nr_channels;
157 }
158 dev_dbg(mci->pdev,
159 "Initialized on node %d, chanmask=0x%x,"
160 " first_page=0x%lx, nr_pages=0x%x\n",
161 priv->node, priv->chanmask,
162 csrow->first_page, nr_pages);
163 break;
164 }
165 of_node_put(np);
166 }
167
cell_edac_probe(struct platform_device * pdev)168 static int cell_edac_probe(struct platform_device *pdev)
169 {
170 struct cbe_mic_tm_regs __iomem *regs;
171 struct mem_ctl_info *mci;
172 struct edac_mc_layer layers[2];
173 struct cell_edac_priv *priv;
174 u64 reg;
175 int rc, chanmask, num_chans;
176
177 regs = cbe_get_cpu_mic_tm_regs(cbe_node_to_cpu(pdev->id));
178 if (regs == NULL)
179 return -ENODEV;
180
181 edac_op_state = EDAC_OPSTATE_POLL;
182
183 /* Get channel population */
184 reg = in_be64(®s->mic_mnt_cfg);
185 dev_dbg(&pdev->dev, "MIC_MNT_CFG = 0x%016llx\n", reg);
186 chanmask = 0;
187 if (reg & CBE_MIC_MNT_CFG_CHAN_0_POP)
188 chanmask |= 0x1;
189 if (reg & CBE_MIC_MNT_CFG_CHAN_1_POP)
190 chanmask |= 0x2;
191 if (chanmask == 0) {
192 dev_warn(&pdev->dev,
193 "Yuck ! No channel populated ? Aborting !\n");
194 return -ENODEV;
195 }
196 dev_dbg(&pdev->dev, "Initial FIR = 0x%016llx\n",
197 in_be64(®s->mic_fir));
198
199 /* Allocate & init EDAC MC data structure */
200 num_chans = chanmask == 3 ? 2 : 1;
201
202 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
203 layers[0].size = 1;
204 layers[0].is_virt_csrow = true;
205 layers[1].type = EDAC_MC_LAYER_CHANNEL;
206 layers[1].size = num_chans;
207 layers[1].is_virt_csrow = false;
208 mci = edac_mc_alloc(pdev->id, ARRAY_SIZE(layers), layers,
209 sizeof(struct cell_edac_priv));
210 if (mci == NULL)
211 return -ENOMEM;
212 priv = mci->pvt_info;
213 priv->regs = regs;
214 priv->node = pdev->id;
215 priv->chanmask = chanmask;
216 mci->pdev = &pdev->dev;
217 mci->mtype_cap = MEM_FLAG_XDR;
218 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
219 mci->edac_cap = EDAC_FLAG_EC | EDAC_FLAG_SECDED;
220 mci->mod_name = "cell_edac";
221 mci->ctl_name = "MIC";
222 mci->dev_name = dev_name(&pdev->dev);
223 mci->edac_check = cell_edac_check;
224 cell_edac_init_csrows(mci);
225
226 /* Register with EDAC core */
227 rc = edac_mc_add_mc(mci);
228 if (rc) {
229 dev_err(&pdev->dev, "failed to register with EDAC core\n");
230 edac_mc_free(mci);
231 return rc;
232 }
233
234 return 0;
235 }
236
cell_edac_remove(struct platform_device * pdev)237 static int cell_edac_remove(struct platform_device *pdev)
238 {
239 struct mem_ctl_info *mci = edac_mc_del_mc(&pdev->dev);
240 if (mci)
241 edac_mc_free(mci);
242 return 0;
243 }
244
245 static struct platform_driver cell_edac_driver = {
246 .driver = {
247 .name = "cbe-mic",
248 },
249 .probe = cell_edac_probe,
250 .remove = cell_edac_remove,
251 };
252
cell_edac_init(void)253 static int __init cell_edac_init(void)
254 {
255 /* Sanity check registers data structure */
256 BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
257 mic_df_ecc_address_0) != 0xf8);
258 BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
259 mic_df_ecc_address_1) != 0x1b8);
260 BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
261 mic_df_config) != 0x218);
262 BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
263 mic_fir) != 0x230);
264 BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
265 mic_mnt_cfg) != 0x210);
266 BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
267 mic_exc) != 0x208);
268
269 return platform_driver_register(&cell_edac_driver);
270 }
271
cell_edac_exit(void)272 static void __exit cell_edac_exit(void)
273 {
274 platform_driver_unregister(&cell_edac_driver);
275 }
276
277 module_init(cell_edac_init);
278 module_exit(cell_edac_exit);
279
280 MODULE_LICENSE("GPL");
281 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
282 MODULE_DESCRIPTION("ECC counting for Cell MIC");
283