blob: b54112ffd28282dd04eed8ffd243c7685c7d10df [file] [log] [blame]
Benjamin Herrenschmidt48764e42008-02-07 00:14:53 -08001/*
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
22struct 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
32static 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
53static 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
73static 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
122static 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
154static 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
212static 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
220static 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
229static 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
248static void __exit cell_edac_exit(void)
249{
250 platform_driver_unregister(&cell_edac_driver);
251}
252
253module_init(cell_edac_init);
254module_exit(cell_edac_exit);
255
256MODULE_LICENSE("GPL");
257MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
258MODULE_DESCRIPTION("ECC counting for Cell MIC");