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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]; | |
c134fd86 | 36 | unsigned long address, pfn, offset, syndrome; |
48764e41 BH |
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; | |
c134fd86 | 47 | syndrome = (ar & 0x000000001fe00000ul) >> 21; |
48764e41 BH |
48 | |
49 | /* TODO: Decoding of the error addresss */ | |
50 | edac_mc_handle_ce(mci, csrow->first_page + pfn, offset, | |
c134fd86 | 51 | syndrome, 0, chan, ""); |
48764e41 BH |
52 | } |
53 | ||
54 | static void cell_edac_count_ue(struct mem_ctl_info *mci, int chan, u64 ar) | |
55 | { | |
56 | struct cell_edac_priv *priv = mci->pvt_info; | |
57 | struct csrow_info *csrow = &mci->csrows[0]; | |
58 | unsigned long address, pfn, offset; | |
59 | ||
60 | dev_dbg(mci->dev, "ECC UE err on node %d, channel %d, ar = 0x%016lx\n", | |
61 | priv->node, chan, ar); | |
62 | ||
63 | /* Address decoding is likely a bit bogus, to dbl check */ | |
64 | address = (ar & 0xffffffffe0000000ul) >> 29; | |
65 | if (priv->chanmask == 0x3) | |
66 | address = (address << 1) | chan; | |
67 | pfn = address >> PAGE_SHIFT; | |
68 | offset = address & ~PAGE_MASK; | |
69 | ||
70 | /* TODO: Decoding of the error addresss */ | |
71 | edac_mc_handle_ue(mci, csrow->first_page + pfn, offset, 0, ""); | |
72 | } | |
73 | ||
74 | static void cell_edac_check(struct mem_ctl_info *mci) | |
75 | { | |
76 | struct cell_edac_priv *priv = mci->pvt_info; | |
77 | u64 fir, addreg, clear = 0; | |
78 | ||
79 | fir = in_be64(&priv->regs->mic_fir); | |
80 | #ifdef DEBUG | |
81 | if (fir != priv->prev_fir) { | |
82 | dev_dbg(mci->dev, "fir change : 0x%016lx\n", fir); | |
83 | priv->prev_fir = fir; | |
84 | } | |
85 | #endif | |
86 | if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_SINGLE_0_ERR)) { | |
87 | addreg = in_be64(&priv->regs->mic_df_ecc_address_0); | |
88 | clear |= CBE_MIC_FIR_ECC_SINGLE_0_RESET; | |
89 | cell_edac_count_ce(mci, 0, addreg); | |
90 | } | |
91 | if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_SINGLE_1_ERR)) { | |
92 | addreg = in_be64(&priv->regs->mic_df_ecc_address_1); | |
93 | clear |= CBE_MIC_FIR_ECC_SINGLE_1_RESET; | |
94 | cell_edac_count_ce(mci, 1, addreg); | |
95 | } | |
96 | if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_MULTI_0_ERR)) { | |
97 | addreg = in_be64(&priv->regs->mic_df_ecc_address_0); | |
98 | clear |= CBE_MIC_FIR_ECC_MULTI_0_RESET; | |
99 | cell_edac_count_ue(mci, 0, addreg); | |
100 | } | |
101 | if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_MULTI_1_ERR)) { | |
102 | addreg = in_be64(&priv->regs->mic_df_ecc_address_1); | |
103 | clear |= CBE_MIC_FIR_ECC_MULTI_1_RESET; | |
104 | cell_edac_count_ue(mci, 1, addreg); | |
105 | } | |
106 | ||
107 | /* The procedure for clearing FIR bits is a bit ... weird */ | |
108 | if (clear) { | |
109 | fir &= ~(CBE_MIC_FIR_ECC_ERR_MASK | CBE_MIC_FIR_ECC_SET_MASK); | |
110 | fir |= CBE_MIC_FIR_ECC_RESET_MASK; | |
111 | fir &= ~clear; | |
112 | out_be64(&priv->regs->mic_fir, fir); | |
113 | (void)in_be64(&priv->regs->mic_fir); | |
114 | ||
115 | mb(); /* sync up */ | |
116 | #ifdef DEBUG | |
117 | fir = in_be64(&priv->regs->mic_fir); | |
118 | dev_dbg(mci->dev, "fir clear : 0x%016lx\n", fir); | |
119 | #endif | |
120 | } | |
121 | } | |
122 | ||
123 | static void __devinit cell_edac_init_csrows(struct mem_ctl_info *mci) | |
124 | { | |
125 | struct csrow_info *csrow = &mci->csrows[0]; | |
126 | struct cell_edac_priv *priv = mci->pvt_info; | |
127 | struct device_node *np; | |
128 | ||
129 | for (np = NULL; | |
130 | (np = of_find_node_by_name(np, "memory")) != NULL;) { | |
131 | struct resource r; | |
132 | ||
133 | /* We "know" that the Cell firmware only creates one entry | |
134 | * in the "memory" nodes. If that changes, this code will | |
135 | * need to be adapted. | |
136 | */ | |
137 | if (of_address_to_resource(np, 0, &r)) | |
138 | continue; | |
139 | if (of_node_to_nid(np) != priv->node) | |
140 | continue; | |
141 | csrow->first_page = r.start >> PAGE_SHIFT; | |
142 | csrow->nr_pages = (r.end - r.start + 1) >> PAGE_SHIFT; | |
143 | csrow->last_page = csrow->first_page + csrow->nr_pages - 1; | |
144 | csrow->mtype = MEM_XDR; | |
145 | csrow->edac_mode = EDAC_FLAG_EC | EDAC_FLAG_SECDED; | |
146 | dev_dbg(mci->dev, | |
147 | "Initialized on node %d, chanmask=0x%x," | |
148 | " first_page=0x%lx, nr_pages=0x%x\n", | |
149 | priv->node, priv->chanmask, | |
150 | csrow->first_page, csrow->nr_pages); | |
151 | break; | |
152 | } | |
153 | } | |
154 | ||
155 | static int __devinit cell_edac_probe(struct platform_device *pdev) | |
156 | { | |
157 | struct cbe_mic_tm_regs __iomem *regs; | |
158 | struct mem_ctl_info *mci; | |
159 | struct cell_edac_priv *priv; | |
160 | u64 reg; | |
161 | int rc, chanmask; | |
162 | ||
163 | regs = cbe_get_cpu_mic_tm_regs(cbe_node_to_cpu(pdev->id)); | |
164 | if (regs == NULL) | |
165 | return -ENODEV; | |
166 | ||
167 | /* Get channel population */ | |
168 | reg = in_be64(®s->mic_mnt_cfg); | |
169 | dev_dbg(&pdev->dev, "MIC_MNT_CFG = 0x%016lx\n", reg); | |
170 | chanmask = 0; | |
171 | if (reg & CBE_MIC_MNT_CFG_CHAN_0_POP) | |
172 | chanmask |= 0x1; | |
173 | if (reg & CBE_MIC_MNT_CFG_CHAN_1_POP) | |
174 | chanmask |= 0x2; | |
175 | if (chanmask == 0) { | |
176 | dev_warn(&pdev->dev, | |
177 | "Yuck ! No channel populated ? Aborting !\n"); | |
178 | return -ENODEV; | |
179 | } | |
180 | dev_dbg(&pdev->dev, "Initial FIR = 0x%016lx\n", | |
181 | in_be64(®s->mic_fir)); | |
182 | ||
183 | /* Allocate & init EDAC MC data structure */ | |
184 | mci = edac_mc_alloc(sizeof(struct cell_edac_priv), 1, | |
185 | chanmask == 3 ? 2 : 1, pdev->id); | |
186 | if (mci == NULL) | |
187 | return -ENOMEM; | |
188 | priv = mci->pvt_info; | |
189 | priv->regs = regs; | |
190 | priv->node = pdev->id; | |
191 | priv->chanmask = chanmask; | |
192 | mci->dev = &pdev->dev; | |
193 | mci->mtype_cap = MEM_FLAG_XDR; | |
194 | mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; | |
195 | mci->edac_cap = EDAC_FLAG_EC | EDAC_FLAG_SECDED; | |
196 | mci->mod_name = "cell_edac"; | |
197 | mci->ctl_name = "MIC"; | |
198 | mci->dev_name = pdev->dev.bus_id; | |
199 | mci->edac_check = cell_edac_check; | |
200 | cell_edac_init_csrows(mci); | |
201 | ||
202 | /* Register with EDAC core */ | |
203 | rc = edac_mc_add_mc(mci); | |
204 | if (rc) { | |
205 | dev_err(&pdev->dev, "failed to register with EDAC core\n"); | |
206 | edac_mc_free(mci); | |
207 | return rc; | |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static int __devexit cell_edac_remove(struct platform_device *pdev) | |
214 | { | |
215 | struct mem_ctl_info *mci = edac_mc_del_mc(&pdev->dev); | |
216 | if (mci) | |
217 | edac_mc_free(mci); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static struct platform_driver cell_edac_driver = { | |
222 | .driver = { | |
223 | .name = "cbe-mic", | |
224 | .owner = THIS_MODULE, | |
225 | }, | |
226 | .probe = cell_edac_probe, | |
227 | .remove = cell_edac_remove, | |
228 | }; | |
229 | ||
230 | static int __init cell_edac_init(void) | |
231 | { | |
232 | /* Sanity check registers data structure */ | |
233 | BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, | |
234 | mic_df_ecc_address_0) != 0xf8); | |
235 | BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, | |
236 | mic_df_ecc_address_1) != 0x1b8); | |
237 | BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, | |
238 | mic_df_config) != 0x218); | |
239 | BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, | |
240 | mic_fir) != 0x230); | |
241 | BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, | |
242 | mic_mnt_cfg) != 0x210); | |
243 | BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, | |
244 | mic_exc) != 0x208); | |
245 | ||
246 | return platform_driver_register(&cell_edac_driver); | |
247 | } | |
248 | ||
249 | static void __exit cell_edac_exit(void) | |
250 | { | |
251 | platform_driver_unregister(&cell_edac_driver); | |
252 | } | |
253 | ||
254 | module_init(cell_edac_init); | |
255 | module_exit(cell_edac_exit); | |
256 | ||
257 | MODULE_LICENSE("GPL"); | |
258 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
259 | MODULE_DESCRIPTION("ECC counting for Cell MIC"); |