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71bcada8 | 1 | /* |
143f4a5a | 2 | * Copyright Altera Corporation (C) 2014-2015. All rights reserved. |
71bcada8 TT |
3 | * Copyright 2011-2012 Calxeda, Inc. |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | * | |
17 | * Adapted from the highbank_mc_edac driver. | |
18 | */ | |
19 | ||
20 | #include <linux/ctype.h> | |
21 | #include <linux/edac.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/mfd/syscon.h> | |
25 | #include <linux/of_platform.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/regmap.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/uaccess.h> | |
30 | ||
143f4a5a | 31 | #include "altera_edac.h" |
71bcada8 TT |
32 | #include "edac_core.h" |
33 | #include "edac_module.h" | |
34 | ||
35 | #define EDAC_MOD_STR "altera_edac" | |
36 | #define EDAC_VERSION "1" | |
37 | ||
143f4a5a TT |
38 | static const struct altr_sdram_prv_data c5_data = { |
39 | .ecc_ctrl_offset = CV_CTLCFG_OFST, | |
40 | .ecc_ctl_en_mask = CV_CTLCFG_ECC_AUTO_EN, | |
41 | .ecc_stat_offset = CV_DRAMSTS_OFST, | |
42 | .ecc_stat_ce_mask = CV_DRAMSTS_SBEERR, | |
43 | .ecc_stat_ue_mask = CV_DRAMSTS_DBEERR, | |
44 | .ecc_saddr_offset = CV_ERRADDR_OFST, | |
45 | .ecc_cecnt_offset = CV_SBECOUNT_OFST, | |
46 | .ecc_uecnt_offset = CV_DBECOUNT_OFST, | |
47 | .ecc_irq_en_offset = CV_DRAMINTR_OFST, | |
48 | .ecc_irq_en_mask = CV_DRAMINTR_INTREN, | |
49 | .ecc_irq_clr_offset = CV_DRAMINTR_OFST, | |
50 | .ecc_irq_clr_mask = (CV_DRAMINTR_INTRCLR | CV_DRAMINTR_INTREN), | |
51 | .ecc_cnt_rst_offset = CV_DRAMINTR_OFST, | |
52 | .ecc_cnt_rst_mask = CV_DRAMINTR_INTRCLR, | |
53 | #ifdef CONFIG_EDAC_DEBUG | |
54 | .ce_ue_trgr_offset = CV_CTLCFG_OFST, | |
55 | .ce_set_mask = CV_CTLCFG_GEN_SB_ERR, | |
56 | .ue_set_mask = CV_CTLCFG_GEN_DB_ERR, | |
57 | #endif | |
71bcada8 TT |
58 | }; |
59 | ||
60 | static irqreturn_t altr_sdram_mc_err_handler(int irq, void *dev_id) | |
61 | { | |
62 | struct mem_ctl_info *mci = dev_id; | |
63 | struct altr_sdram_mc_data *drvdata = mci->pvt_info; | |
143f4a5a | 64 | const struct altr_sdram_prv_data *priv = drvdata->data; |
71bcada8 TT |
65 | u32 status, err_count, err_addr; |
66 | ||
67 | /* Error Address is shared by both SBE & DBE */ | |
143f4a5a | 68 | regmap_read(drvdata->mc_vbase, priv->ecc_saddr_offset, &err_addr); |
71bcada8 | 69 | |
143f4a5a | 70 | regmap_read(drvdata->mc_vbase, priv->ecc_stat_offset, &status); |
71bcada8 | 71 | |
143f4a5a TT |
72 | if (status & priv->ecc_stat_ue_mask) { |
73 | regmap_read(drvdata->mc_vbase, priv->ecc_uecnt_offset, | |
74 | &err_count); | |
71bcada8 TT |
75 | panic("\nEDAC: [%d Uncorrectable errors @ 0x%08X]\n", |
76 | err_count, err_addr); | |
77 | } | |
143f4a5a TT |
78 | if (status & priv->ecc_stat_ce_mask) { |
79 | regmap_read(drvdata->mc_vbase, priv->ecc_cecnt_offset, | |
80 | &err_count); | |
71bcada8 TT |
81 | edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count, |
82 | err_addr >> PAGE_SHIFT, | |
83 | err_addr & ~PAGE_MASK, 0, | |
84 | 0, 0, -1, mci->ctl_name, ""); | |
85 | } | |
86 | ||
143f4a5a TT |
87 | regmap_write(drvdata->mc_vbase, priv->ecc_irq_clr_offset, |
88 | priv->ecc_irq_clr_mask); | |
71bcada8 TT |
89 | |
90 | return IRQ_HANDLED; | |
91 | } | |
92 | ||
93 | #ifdef CONFIG_EDAC_DEBUG | |
94 | static ssize_t altr_sdr_mc_err_inject_write(struct file *file, | |
95 | const char __user *data, | |
96 | size_t count, loff_t *ppos) | |
97 | { | |
98 | struct mem_ctl_info *mci = file->private_data; | |
99 | struct altr_sdram_mc_data *drvdata = mci->pvt_info; | |
143f4a5a | 100 | const struct altr_sdram_prv_data *priv = drvdata->data; |
71bcada8 TT |
101 | u32 *ptemp; |
102 | dma_addr_t dma_handle; | |
103 | u32 reg, read_reg; | |
104 | ||
105 | ptemp = dma_alloc_coherent(mci->pdev, 16, &dma_handle, GFP_KERNEL); | |
106 | if (!ptemp) { | |
107 | dma_free_coherent(mci->pdev, 16, ptemp, dma_handle); | |
108 | edac_printk(KERN_ERR, EDAC_MC, | |
109 | "Inject: Buffer Allocation error\n"); | |
110 | return -ENOMEM; | |
111 | } | |
112 | ||
143f4a5a TT |
113 | regmap_read(drvdata->mc_vbase, priv->ce_ue_trgr_offset, |
114 | &read_reg); | |
115 | read_reg &= ~(priv->ce_set_mask | priv->ue_set_mask); | |
71bcada8 TT |
116 | |
117 | /* Error are injected by writing a word while the SBE or DBE | |
118 | * bit in the CTLCFG register is set. Reading the word will | |
119 | * trigger the SBE or DBE error and the corresponding IRQ. | |
120 | */ | |
121 | if (count == 3) { | |
122 | edac_printk(KERN_ALERT, EDAC_MC, | |
123 | "Inject Double bit error\n"); | |
143f4a5a TT |
124 | regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset, |
125 | (read_reg | priv->ue_set_mask)); | |
71bcada8 TT |
126 | } else { |
127 | edac_printk(KERN_ALERT, EDAC_MC, | |
128 | "Inject Single bit error\n"); | |
143f4a5a TT |
129 | regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset, |
130 | (read_reg | priv->ce_set_mask)); | |
71bcada8 TT |
131 | } |
132 | ||
133 | ptemp[0] = 0x5A5A5A5A; | |
134 | ptemp[1] = 0xA5A5A5A5; | |
135 | ||
136 | /* Clear the error injection bits */ | |
143f4a5a | 137 | regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset, read_reg); |
71bcada8 TT |
138 | /* Ensure it has been written out */ |
139 | wmb(); | |
140 | ||
141 | /* | |
142 | * To trigger the error, we need to read the data back | |
143 | * (the data was written with errors above). | |
144 | * The ACCESS_ONCE macros and printk are used to prevent the | |
145 | * the compiler optimizing these reads out. | |
146 | */ | |
147 | reg = ACCESS_ONCE(ptemp[0]); | |
148 | read_reg = ACCESS_ONCE(ptemp[1]); | |
149 | /* Force Read */ | |
150 | rmb(); | |
151 | ||
152 | edac_printk(KERN_ALERT, EDAC_MC, "Read Data [0x%X, 0x%X]\n", | |
153 | reg, read_reg); | |
154 | ||
155 | dma_free_coherent(mci->pdev, 16, ptemp, dma_handle); | |
156 | ||
157 | return count; | |
158 | } | |
159 | ||
160 | static const struct file_operations altr_sdr_mc_debug_inject_fops = { | |
161 | .open = simple_open, | |
162 | .write = altr_sdr_mc_err_inject_write, | |
163 | .llseek = generic_file_llseek, | |
164 | }; | |
165 | ||
166 | static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci) | |
167 | { | |
168 | if (mci->debugfs) | |
169 | debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci, | |
170 | &altr_sdr_mc_debug_inject_fops); | |
171 | } | |
172 | #else | |
173 | static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci) | |
174 | {} | |
175 | #endif | |
176 | ||
f9ae487e TT |
177 | /* Get total memory size from Open Firmware DTB */ |
178 | static unsigned long get_total_mem(void) | |
71bcada8 | 179 | { |
f9ae487e TT |
180 | struct device_node *np = NULL; |
181 | const unsigned int *reg, *reg_end; | |
182 | int len, sw, aw; | |
183 | unsigned long start, size, total_mem = 0; | |
184 | ||
185 | for_each_node_by_type(np, "memory") { | |
186 | aw = of_n_addr_cells(np); | |
187 | sw = of_n_size_cells(np); | |
188 | reg = (const unsigned int *)of_get_property(np, "reg", &len); | |
189 | reg_end = reg + (len / sizeof(u32)); | |
190 | ||
191 | total_mem = 0; | |
192 | do { | |
193 | start = of_read_number(reg, aw); | |
194 | reg += aw; | |
195 | size = of_read_number(reg, sw); | |
196 | reg += sw; | |
197 | total_mem += size; | |
198 | } while (reg < reg_end); | |
199 | } | |
200 | edac_dbg(0, "total_mem 0x%lx\n", total_mem); | |
201 | return total_mem; | |
71bcada8 TT |
202 | } |
203 | ||
143f4a5a TT |
204 | static const struct of_device_id altr_sdram_ctrl_of_match[] = { |
205 | { .compatible = "altr,sdram-edac", .data = (void *)&c5_data}, | |
206 | {}, | |
207 | }; | |
208 | MODULE_DEVICE_TABLE(of, altr_sdram_ctrl_of_match); | |
209 | ||
71bcada8 TT |
210 | static int altr_sdram_probe(struct platform_device *pdev) |
211 | { | |
143f4a5a | 212 | const struct of_device_id *id; |
71bcada8 TT |
213 | struct edac_mc_layer layers[2]; |
214 | struct mem_ctl_info *mci; | |
215 | struct altr_sdram_mc_data *drvdata; | |
143f4a5a | 216 | const struct altr_sdram_prv_data *priv; |
71bcada8 TT |
217 | struct regmap *mc_vbase; |
218 | struct dimm_info *dimm; | |
143f4a5a TT |
219 | u32 read_reg; |
220 | int irq, res = 0; | |
221 | unsigned long mem_size; | |
222 | ||
223 | id = of_match_device(altr_sdram_ctrl_of_match, &pdev->dev); | |
224 | if (!id) | |
225 | return -ENODEV; | |
71bcada8 | 226 | |
71bcada8 TT |
227 | /* Grab the register range from the sdr controller in device tree */ |
228 | mc_vbase = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, | |
229 | "altr,sdr-syscon"); | |
230 | if (IS_ERR(mc_vbase)) { | |
231 | edac_printk(KERN_ERR, EDAC_MC, | |
232 | "regmap for altr,sdr-syscon lookup failed.\n"); | |
233 | return -ENODEV; | |
234 | } | |
235 | ||
143f4a5a TT |
236 | /* Check specific dependencies for the module */ |
237 | priv = of_match_node(altr_sdram_ctrl_of_match, | |
238 | pdev->dev.of_node)->data; | |
239 | ||
240 | /* Validate the SDRAM controller has ECC enabled */ | |
241 | if (regmap_read(mc_vbase, priv->ecc_ctrl_offset, &read_reg) || | |
242 | ((read_reg & priv->ecc_ctl_en_mask) != priv->ecc_ctl_en_mask)) { | |
71bcada8 TT |
243 | edac_printk(KERN_ERR, EDAC_MC, |
244 | "No ECC/ECC disabled [0x%08X]\n", read_reg); | |
245 | return -ENODEV; | |
246 | } | |
247 | ||
248 | /* Grab memory size from device tree. */ | |
f9ae487e | 249 | mem_size = get_total_mem(); |
71bcada8 | 250 | if (!mem_size) { |
f9ae487e | 251 | edac_printk(KERN_ERR, EDAC_MC, "Unable to calculate memory size\n"); |
71bcada8 TT |
252 | return -ENODEV; |
253 | } | |
254 | ||
143f4a5a TT |
255 | /* Ensure the SDRAM Interrupt is disabled */ |
256 | if (regmap_update_bits(mc_vbase, priv->ecc_irq_en_offset, | |
257 | priv->ecc_irq_en_mask, 0)) { | |
258 | edac_printk(KERN_ERR, EDAC_MC, | |
259 | "Error disabling SDRAM ECC IRQ\n"); | |
260 | return -ENODEV; | |
261 | } | |
262 | ||
263 | /* Toggle to clear the SDRAM Error count */ | |
264 | if (regmap_update_bits(mc_vbase, priv->ecc_cnt_rst_offset, | |
265 | priv->ecc_cnt_rst_mask, | |
266 | priv->ecc_cnt_rst_mask)) { | |
267 | edac_printk(KERN_ERR, EDAC_MC, | |
268 | "Error clearing SDRAM ECC count\n"); | |
269 | return -ENODEV; | |
270 | } | |
271 | ||
272 | if (regmap_update_bits(mc_vbase, priv->ecc_cnt_rst_offset, | |
273 | priv->ecc_cnt_rst_mask, 0)) { | |
71bcada8 | 274 | edac_printk(KERN_ERR, EDAC_MC, |
143f4a5a | 275 | "Error clearing SDRAM ECC count\n"); |
71bcada8 TT |
276 | return -ENODEV; |
277 | } | |
278 | ||
279 | irq = platform_get_irq(pdev, 0); | |
280 | if (irq < 0) { | |
281 | edac_printk(KERN_ERR, EDAC_MC, | |
282 | "No irq %d in DT\n", irq); | |
283 | return -ENODEV; | |
284 | } | |
285 | ||
286 | layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; | |
287 | layers[0].size = 1; | |
288 | layers[0].is_virt_csrow = true; | |
289 | layers[1].type = EDAC_MC_LAYER_CHANNEL; | |
290 | layers[1].size = 1; | |
291 | layers[1].is_virt_csrow = false; | |
292 | mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, | |
293 | sizeof(struct altr_sdram_mc_data)); | |
294 | if (!mci) | |
295 | return -ENOMEM; | |
296 | ||
297 | mci->pdev = &pdev->dev; | |
298 | drvdata = mci->pvt_info; | |
299 | drvdata->mc_vbase = mc_vbase; | |
143f4a5a | 300 | drvdata->data = priv; |
71bcada8 TT |
301 | platform_set_drvdata(pdev, mci); |
302 | ||
303 | if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) { | |
143f4a5a TT |
304 | edac_printk(KERN_ERR, EDAC_MC, |
305 | "Unable to get managed device resource\n"); | |
71bcada8 TT |
306 | res = -ENOMEM; |
307 | goto free; | |
308 | } | |
309 | ||
310 | mci->mtype_cap = MEM_FLAG_DDR3; | |
311 | mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; | |
312 | mci->edac_cap = EDAC_FLAG_SECDED; | |
313 | mci->mod_name = EDAC_MOD_STR; | |
314 | mci->mod_ver = EDAC_VERSION; | |
315 | mci->ctl_name = dev_name(&pdev->dev); | |
316 | mci->scrub_mode = SCRUB_SW_SRC; | |
317 | mci->dev_name = dev_name(&pdev->dev); | |
318 | ||
319 | dimm = *mci->dimms; | |
320 | dimm->nr_pages = ((mem_size - 1) >> PAGE_SHIFT) + 1; | |
321 | dimm->grain = 8; | |
322 | dimm->dtype = DEV_X8; | |
323 | dimm->mtype = MEM_DDR3; | |
324 | dimm->edac_mode = EDAC_SECDED; | |
325 | ||
326 | res = edac_mc_add_mc(mci); | |
327 | if (res < 0) | |
328 | goto err; | |
329 | ||
330 | res = devm_request_irq(&pdev->dev, irq, altr_sdram_mc_err_handler, | |
331 | 0, dev_name(&pdev->dev), mci); | |
332 | if (res < 0) { | |
333 | edac_mc_printk(mci, KERN_ERR, | |
334 | "Unable to request irq %d\n", irq); | |
335 | res = -ENODEV; | |
336 | goto err2; | |
337 | } | |
338 | ||
143f4a5a TT |
339 | /* Infrastructure ready - enable the IRQ */ |
340 | if (regmap_update_bits(drvdata->mc_vbase, priv->ecc_irq_en_offset, | |
341 | priv->ecc_irq_en_mask, priv->ecc_irq_en_mask)) { | |
71bcada8 TT |
342 | edac_mc_printk(mci, KERN_ERR, |
343 | "Error enabling SDRAM ECC IRQ\n"); | |
344 | res = -ENODEV; | |
345 | goto err2; | |
346 | } | |
347 | ||
348 | altr_sdr_mc_create_debugfs_nodes(mci); | |
349 | ||
350 | devres_close_group(&pdev->dev, NULL); | |
351 | ||
352 | return 0; | |
353 | ||
354 | err2: | |
355 | edac_mc_del_mc(&pdev->dev); | |
356 | err: | |
357 | devres_release_group(&pdev->dev, NULL); | |
358 | free: | |
359 | edac_mc_free(mci); | |
360 | edac_printk(KERN_ERR, EDAC_MC, | |
361 | "EDAC Probe Failed; Error %d\n", res); | |
362 | ||
363 | return res; | |
364 | } | |
365 | ||
366 | static int altr_sdram_remove(struct platform_device *pdev) | |
367 | { | |
368 | struct mem_ctl_info *mci = platform_get_drvdata(pdev); | |
369 | ||
370 | edac_mc_del_mc(&pdev->dev); | |
371 | edac_mc_free(mci); | |
372 | platform_set_drvdata(pdev, NULL); | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
71bcada8 TT |
377 | static struct platform_driver altr_sdram_edac_driver = { |
378 | .probe = altr_sdram_probe, | |
379 | .remove = altr_sdram_remove, | |
380 | .driver = { | |
381 | .name = "altr_sdram_edac", | |
382 | .of_match_table = altr_sdram_ctrl_of_match, | |
383 | }, | |
384 | }; | |
385 | ||
386 | module_platform_driver(altr_sdram_edac_driver); | |
387 | ||
388 | MODULE_LICENSE("GPL v2"); | |
389 | MODULE_AUTHOR("Thor Thayer"); | |
390 | MODULE_DESCRIPTION("EDAC Driver for Altera SDRAM Controller"); |