drivers-edac: add Cell MC driver
[linux-2.6.git] / drivers / edac / cell_edac.c
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/module.h>
13 #include <linux/init.h>
14 #include <linux/platform_device.h>
15 #include <linux/stop_machine.h>
16 #include <linux/io.h>
17 #include <asm/machdep.h>
18 #include <asm/cell-regs.h>
19
20 #include "edac_core.h"
21
22 struct cell_edac_priv
23 {
24         struct cbe_mic_tm_regs __iomem  *regs;
25         int                             node;
26         int                             chanmask;
27 #ifdef DEBUG
28         u64                             prev_fir;
29 #endif
30 };
31
32 static void cell_edac_count_ce(struct mem_ctl_info *mci, int chan, u64 ar)
33 {
34         struct cell_edac_priv           *priv = mci->pvt_info;
35         struct csrow_info               *csrow = &mci->csrows[0];
36         unsigned long                   address, pfn, offset;
37
38         dev_dbg(mci->dev, "ECC CE err on node %d, channel %d, ar = 0x%016lx\n",
39                 priv->node, chan, ar);
40
41         /* Address decoding is likely a bit bogus, to dbl check */
42         address = (ar & 0xffffffffe0000000ul) >> 29;
43         if (priv->chanmask == 0x3)
44                 address = (address << 1) | chan;
45         pfn = address >> PAGE_SHIFT;
46         offset = address & ~PAGE_MASK;
47
48         /* TODO: Decoding of the error addresss */
49         edac_mc_handle_ce(mci, csrow->first_page + pfn, offset,
50                           0, 0, chan, "");
51 }
52
53 static void cell_edac_count_ue(struct mem_ctl_info *mci, int chan, u64 ar)
54 {
55         struct cell_edac_priv           *priv = mci->pvt_info;
56         struct csrow_info               *csrow = &mci->csrows[0];
57         unsigned long                   address, pfn, offset;
58
59         dev_dbg(mci->dev, "ECC UE err on node %d, channel %d, ar = 0x%016lx\n",
60                 priv->node, chan, ar);
61
62         /* Address decoding is likely a bit bogus, to dbl check */
63         address = (ar & 0xffffffffe0000000ul) >> 29;
64         if (priv->chanmask == 0x3)
65                 address = (address << 1) | chan;
66         pfn = address >> PAGE_SHIFT;
67         offset = address & ~PAGE_MASK;
68
69         /* TODO: Decoding of the error addresss */
70         edac_mc_handle_ue(mci, csrow->first_page + pfn, offset, 0, "");
71 }
72
73 static void cell_edac_check(struct mem_ctl_info *mci)
74 {
75         struct cell_edac_priv           *priv = mci->pvt_info;
76         u64                             fir, addreg, clear = 0;
77
78         fir = in_be64(&priv->regs->mic_fir);
79 #ifdef DEBUG
80         if (fir != priv->prev_fir) {
81                 dev_dbg(mci->dev, "fir change : 0x%016lx\n", fir);
82                 priv->prev_fir = fir;
83         }
84 #endif
85         if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_SINGLE_0_ERR)) {
86                 addreg = in_be64(&priv->regs->mic_df_ecc_address_0);
87                 clear |= CBE_MIC_FIR_ECC_SINGLE_0_RESET;
88                 cell_edac_count_ce(mci, 0, addreg);
89         }
90         if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_SINGLE_1_ERR)) {
91                 addreg = in_be64(&priv->regs->mic_df_ecc_address_1);
92                 clear |= CBE_MIC_FIR_ECC_SINGLE_1_RESET;
93                 cell_edac_count_ce(mci, 1, addreg);
94         }
95         if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_MULTI_0_ERR)) {
96                 addreg = in_be64(&priv->regs->mic_df_ecc_address_0);
97                 clear |= CBE_MIC_FIR_ECC_MULTI_0_RESET;
98                 cell_edac_count_ue(mci, 0, addreg);
99         }
100         if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_MULTI_1_ERR)) {
101                 addreg = in_be64(&priv->regs->mic_df_ecc_address_1);
102                 clear |= CBE_MIC_FIR_ECC_MULTI_1_RESET;
103                 cell_edac_count_ue(mci, 1, addreg);
104         }
105
106         /* The procedure for clearing FIR bits is a bit ... weird */
107         if (clear) {
108                 fir &= ~(CBE_MIC_FIR_ECC_ERR_MASK | CBE_MIC_FIR_ECC_SET_MASK);
109                 fir |= CBE_MIC_FIR_ECC_RESET_MASK;
110                 fir &= ~clear;
111                 out_be64(&priv->regs->mic_fir, fir);
112                 (void)in_be64(&priv->regs->mic_fir);
113
114                 mb();   /* sync up */
115 #ifdef DEBUG
116                 fir = in_be64(&priv->regs->mic_fir);
117                 dev_dbg(mci->dev, "fir clear  : 0x%016lx\n", fir);
118 #endif
119         }
120 }
121
122 static void __devinit cell_edac_init_csrows(struct mem_ctl_info *mci)
123 {
124         struct csrow_info               *csrow = &mci->csrows[0];
125         struct cell_edac_priv           *priv = mci->pvt_info;
126         struct device_node              *np;
127
128         for (np = NULL;
129              (np = of_find_node_by_name(np, "memory")) != NULL;) {
130                 struct resource r;
131
132                 /* We "know" that the Cell firmware only creates one entry
133                  * in the "memory" nodes. If that changes, this code will
134                  * need to be adapted.
135                  */
136                 if (of_address_to_resource(np, 0, &r))
137                         continue;
138                 if (of_node_to_nid(np) != priv->node)
139                         continue;
140                 csrow->first_page = r.start >> PAGE_SHIFT;
141                 csrow->nr_pages = (r.end - r.start + 1) >> PAGE_SHIFT;
142                 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
143                 csrow->mtype = MEM_XDR;
144                 csrow->edac_mode = EDAC_FLAG_EC | EDAC_FLAG_SECDED;
145                 dev_dbg(mci->dev,
146                         "Initialized on node %d, chanmask=0x%x,"
147                         " first_page=0x%lx, nr_pages=0x%x\n",
148                         priv->node, priv->chanmask,
149                         csrow->first_page, csrow->nr_pages);
150                 break;
151         }
152 }
153
154 static int __devinit cell_edac_probe(struct platform_device *pdev)
155 {
156         struct cbe_mic_tm_regs __iomem  *regs;
157         struct mem_ctl_info             *mci;
158         struct cell_edac_priv           *priv;
159         u64                             reg;
160         int                             rc, chanmask;
161
162         regs = cbe_get_cpu_mic_tm_regs(cbe_node_to_cpu(pdev->id));
163         if (regs == NULL)
164                 return -ENODEV;
165
166         /* Get channel population */
167         reg = in_be64(&regs->mic_mnt_cfg);
168         dev_dbg(&pdev->dev, "MIC_MNT_CFG = 0x%016lx\n", reg);
169         chanmask = 0;
170         if (reg & CBE_MIC_MNT_CFG_CHAN_0_POP)
171                 chanmask |= 0x1;
172         if (reg & CBE_MIC_MNT_CFG_CHAN_1_POP)
173                 chanmask |= 0x2;
174         if (chanmask == 0) {
175                 dev_warn(&pdev->dev,
176                          "Yuck ! No channel populated ? Aborting !\n");
177                 return -ENODEV;
178         }
179         dev_dbg(&pdev->dev, "Initial FIR = 0x%016lx\n",
180                 in_be64(&regs->mic_fir));
181
182         /* Allocate & init EDAC MC data structure */
183         mci = edac_mc_alloc(sizeof(struct cell_edac_priv), 1,
184                             chanmask == 3 ? 2 : 1, pdev->id);
185         if (mci == NULL)
186                 return -ENOMEM;
187         priv = mci->pvt_info;
188         priv->regs = regs;
189         priv->node = pdev->id;
190         priv->chanmask = chanmask;
191         mci->dev = &pdev->dev;
192         mci->mtype_cap = MEM_FLAG_XDR;
193         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
194         mci->edac_cap = EDAC_FLAG_EC | EDAC_FLAG_SECDED;
195         mci->mod_name = "cell_edac";
196         mci->ctl_name = "MIC";
197         mci->dev_name = pdev->dev.bus_id;
198         mci->edac_check = cell_edac_check;
199         cell_edac_init_csrows(mci);
200
201         /* Register with EDAC core */
202         rc = edac_mc_add_mc(mci);
203         if (rc) {
204                 dev_err(&pdev->dev, "failed to register with EDAC core\n");
205                 edac_mc_free(mci);
206                 return rc;
207         }
208
209         return 0;
210 }
211
212 static int __devexit cell_edac_remove(struct platform_device *pdev)
213 {
214         struct mem_ctl_info *mci = edac_mc_del_mc(&pdev->dev);
215         if (mci)
216                 edac_mc_free(mci);
217         return 0;
218 }
219
220 static struct platform_driver cell_edac_driver = {
221         .driver         = {
222                 .name   = "cbe-mic",
223                 .owner  = THIS_MODULE,
224         },
225         .probe          = cell_edac_probe,
226         .remove         = cell_edac_remove,
227 };
228
229 static int __init cell_edac_init(void)
230 {
231         /* Sanity check registers data structure */
232         BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
233                               mic_df_ecc_address_0) != 0xf8);
234         BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
235                               mic_df_ecc_address_1) != 0x1b8);
236         BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
237                               mic_df_config) != 0x218);
238         BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
239                               mic_fir) != 0x230);
240         BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
241                               mic_mnt_cfg) != 0x210);
242         BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs,
243                               mic_exc) != 0x208);
244
245         return platform_driver_register(&cell_edac_driver);
246 }
247
248 static void __exit cell_edac_exit(void)
249 {
250         platform_driver_unregister(&cell_edac_driver);
251 }
252
253 module_init(cell_edac_init);
254 module_exit(cell_edac_exit);
255
256 MODULE_LICENSE("GPL");
257 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
258 MODULE_DESCRIPTION("ECC counting for Cell MIC");