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27450653 CK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (c) 2018, The Linux Foundation. All rights reserved. | |
4 | */ | |
5 | ||
6 | #include <linux/edac.h> | |
7 | #include <linux/interrupt.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/platform_device.h> | |
11 | #include <linux/regmap.h> | |
12 | #include <linux/soc/qcom/llcc-qcom.h> | |
13 | ||
14 | #include "edac_mc.h" | |
15 | #include "edac_device.h" | |
16 | ||
17 | #define EDAC_LLCC "qcom_llcc" | |
18 | ||
19 | #define LLCC_ERP_PANIC_ON_UE 1 | |
20 | ||
21 | #define TRP_SYN_REG_CNT 6 | |
22 | #define DRP_SYN_REG_CNT 8 | |
23 | ||
24 | #define LLCC_COMMON_STATUS0 0x0003000c | |
25 | #define LLCC_LB_CNT_MASK GENMASK(31, 28) | |
26 | #define LLCC_LB_CNT_SHIFT 28 | |
27 | ||
28 | /* Single & double bit syndrome register offsets */ | |
29 | #define TRP_ECC_SB_ERR_SYN0 0x0002304c | |
30 | #define TRP_ECC_DB_ERR_SYN0 0x00020370 | |
31 | #define DRP_ECC_SB_ERR_SYN0 0x0004204c | |
32 | #define DRP_ECC_DB_ERR_SYN0 0x00042070 | |
33 | ||
34 | /* Error register offsets */ | |
35 | #define TRP_ECC_ERROR_STATUS1 0x00020348 | |
36 | #define TRP_ECC_ERROR_STATUS0 0x00020344 | |
37 | #define DRP_ECC_ERROR_STATUS1 0x00042048 | |
38 | #define DRP_ECC_ERROR_STATUS0 0x00042044 | |
39 | ||
40 | /* TRP, DRP interrupt register offsets */ | |
41 | #define DRP_INTERRUPT_STATUS 0x00041000 | |
42 | #define TRP_INTERRUPT_0_STATUS 0x00020480 | |
43 | #define DRP_INTERRUPT_CLEAR 0x00041008 | |
44 | #define DRP_ECC_ERROR_CNTR_CLEAR 0x00040004 | |
45 | #define TRP_INTERRUPT_0_CLEAR 0x00020484 | |
46 | #define TRP_ECC_ERROR_CNTR_CLEAR 0x00020440 | |
47 | ||
48 | /* Mask and shift macros */ | |
49 | #define ECC_DB_ERR_COUNT_MASK GENMASK(4, 0) | |
50 | #define ECC_DB_ERR_WAYS_MASK GENMASK(31, 16) | |
51 | #define ECC_DB_ERR_WAYS_SHIFT BIT(4) | |
52 | ||
53 | #define ECC_SB_ERR_COUNT_MASK GENMASK(23, 16) | |
54 | #define ECC_SB_ERR_COUNT_SHIFT BIT(4) | |
55 | #define ECC_SB_ERR_WAYS_MASK GENMASK(15, 0) | |
56 | ||
57 | #define SB_ECC_ERROR BIT(0) | |
58 | #define DB_ECC_ERROR BIT(1) | |
59 | ||
60 | #define DRP_TRP_INT_CLEAR GENMASK(1, 0) | |
61 | #define DRP_TRP_CNT_CLEAR GENMASK(1, 0) | |
62 | ||
63 | /* Config registers offsets*/ | |
64 | #define DRP_ECC_ERROR_CFG 0x00040000 | |
65 | ||
66 | /* Tag RAM, Data RAM interrupt register offsets */ | |
67 | #define CMN_INTERRUPT_0_ENABLE 0x0003001c | |
68 | #define CMN_INTERRUPT_2_ENABLE 0x0003003c | |
69 | #define TRP_INTERRUPT_0_ENABLE 0x00020488 | |
70 | #define DRP_INTERRUPT_ENABLE 0x0004100c | |
71 | ||
72 | #define SB_ERROR_THRESHOLD 0x1 | |
73 | #define SB_ERROR_THRESHOLD_SHIFT 24 | |
74 | #define SB_DB_TRP_INTERRUPT_ENABLE 0x3 | |
75 | #define TRP0_INTERRUPT_ENABLE 0x1 | |
76 | #define DRP0_INTERRUPT_ENABLE BIT(6) | |
77 | #define SB_DB_DRP_INTERRUPT_ENABLE 0x3 | |
78 | ||
79 | enum { | |
80 | LLCC_DRAM_CE = 0, | |
81 | LLCC_DRAM_UE, | |
82 | LLCC_TRAM_CE, | |
83 | LLCC_TRAM_UE, | |
84 | }; | |
85 | ||
86 | static const struct llcc_edac_reg_data edac_reg_data[] = { | |
87 | [LLCC_DRAM_CE] = { | |
88 | .name = "DRAM Single-bit", | |
89 | .synd_reg = DRP_ECC_SB_ERR_SYN0, | |
90 | .count_status_reg = DRP_ECC_ERROR_STATUS1, | |
91 | .ways_status_reg = DRP_ECC_ERROR_STATUS0, | |
92 | .reg_cnt = DRP_SYN_REG_CNT, | |
93 | .count_mask = ECC_SB_ERR_COUNT_MASK, | |
94 | .ways_mask = ECC_SB_ERR_WAYS_MASK, | |
95 | .count_shift = ECC_SB_ERR_COUNT_SHIFT, | |
96 | }, | |
97 | [LLCC_DRAM_UE] = { | |
98 | .name = "DRAM Double-bit", | |
99 | .synd_reg = DRP_ECC_DB_ERR_SYN0, | |
100 | .count_status_reg = DRP_ECC_ERROR_STATUS1, | |
101 | .ways_status_reg = DRP_ECC_ERROR_STATUS0, | |
102 | .reg_cnt = DRP_SYN_REG_CNT, | |
103 | .count_mask = ECC_DB_ERR_COUNT_MASK, | |
104 | .ways_mask = ECC_DB_ERR_WAYS_MASK, | |
105 | .ways_shift = ECC_DB_ERR_WAYS_SHIFT, | |
106 | }, | |
107 | [LLCC_TRAM_CE] = { | |
108 | .name = "TRAM Single-bit", | |
109 | .synd_reg = TRP_ECC_SB_ERR_SYN0, | |
110 | .count_status_reg = TRP_ECC_ERROR_STATUS1, | |
111 | .ways_status_reg = TRP_ECC_ERROR_STATUS0, | |
112 | .reg_cnt = TRP_SYN_REG_CNT, | |
113 | .count_mask = ECC_SB_ERR_COUNT_MASK, | |
114 | .ways_mask = ECC_SB_ERR_WAYS_MASK, | |
115 | .count_shift = ECC_SB_ERR_COUNT_SHIFT, | |
116 | }, | |
117 | [LLCC_TRAM_UE] = { | |
118 | .name = "TRAM Double-bit", | |
119 | .synd_reg = TRP_ECC_DB_ERR_SYN0, | |
120 | .count_status_reg = TRP_ECC_ERROR_STATUS1, | |
121 | .ways_status_reg = TRP_ECC_ERROR_STATUS0, | |
122 | .reg_cnt = TRP_SYN_REG_CNT, | |
123 | .count_mask = ECC_DB_ERR_COUNT_MASK, | |
124 | .ways_mask = ECC_DB_ERR_WAYS_MASK, | |
125 | .ways_shift = ECC_DB_ERR_WAYS_SHIFT, | |
126 | }, | |
127 | }; | |
128 | ||
129 | static int qcom_llcc_core_setup(struct regmap *llcc_bcast_regmap) | |
130 | { | |
131 | u32 sb_err_threshold; | |
132 | int ret; | |
133 | ||
134 | /* | |
135 | * Configure interrupt enable registers such that Tag, Data RAM related | |
136 | * interrupts are propagated to interrupt controller for servicing | |
137 | */ | |
138 | ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE, | |
139 | TRP0_INTERRUPT_ENABLE, | |
140 | TRP0_INTERRUPT_ENABLE); | |
141 | if (ret) | |
142 | return ret; | |
143 | ||
144 | ret = regmap_update_bits(llcc_bcast_regmap, TRP_INTERRUPT_0_ENABLE, | |
145 | SB_DB_TRP_INTERRUPT_ENABLE, | |
146 | SB_DB_TRP_INTERRUPT_ENABLE); | |
147 | if (ret) | |
148 | return ret; | |
149 | ||
150 | sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT); | |
151 | ret = regmap_write(llcc_bcast_regmap, DRP_ECC_ERROR_CFG, | |
152 | sb_err_threshold); | |
153 | if (ret) | |
154 | return ret; | |
155 | ||
156 | ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE, | |
157 | DRP0_INTERRUPT_ENABLE, | |
158 | DRP0_INTERRUPT_ENABLE); | |
159 | if (ret) | |
160 | return ret; | |
161 | ||
162 | ret = regmap_write(llcc_bcast_regmap, DRP_INTERRUPT_ENABLE, | |
163 | SB_DB_DRP_INTERRUPT_ENABLE); | |
164 | return ret; | |
165 | } | |
166 | ||
167 | /* Clear the error interrupt and counter registers */ | |
168 | static int | |
169 | qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv) | |
170 | { | |
171 | int ret = 0; | |
172 | ||
173 | switch (err_type) { | |
174 | case LLCC_DRAM_CE: | |
175 | case LLCC_DRAM_UE: | |
176 | ret = regmap_write(drv->bcast_regmap, DRP_INTERRUPT_CLEAR, | |
177 | DRP_TRP_INT_CLEAR); | |
178 | if (ret) | |
179 | return ret; | |
180 | ||
181 | ret = regmap_write(drv->bcast_regmap, DRP_ECC_ERROR_CNTR_CLEAR, | |
182 | DRP_TRP_CNT_CLEAR); | |
183 | if (ret) | |
184 | return ret; | |
185 | break; | |
186 | case LLCC_TRAM_CE: | |
187 | case LLCC_TRAM_UE: | |
188 | ret = regmap_write(drv->bcast_regmap, TRP_INTERRUPT_0_CLEAR, | |
189 | DRP_TRP_INT_CLEAR); | |
190 | if (ret) | |
191 | return ret; | |
192 | ||
193 | ret = regmap_write(drv->bcast_regmap, TRP_ECC_ERROR_CNTR_CLEAR, | |
194 | DRP_TRP_CNT_CLEAR); | |
195 | if (ret) | |
196 | return ret; | |
197 | break; | |
198 | default: | |
199 | ret = -EINVAL; | |
200 | edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n", | |
201 | err_type); | |
202 | } | |
203 | return ret; | |
204 | } | |
205 | ||
206 | /* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/ | |
207 | static int | |
208 | dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type) | |
209 | { | |
210 | struct llcc_edac_reg_data reg_data = edac_reg_data[err_type]; | |
211 | int err_cnt, err_ways, ret, i; | |
212 | u32 synd_reg, synd_val; | |
213 | ||
214 | for (i = 0; i < reg_data.reg_cnt; i++) { | |
215 | synd_reg = reg_data.synd_reg + (i * 4); | |
216 | ret = regmap_read(drv->regmap, drv->offsets[bank] + synd_reg, | |
217 | &synd_val); | |
218 | if (ret) | |
219 | goto clear; | |
220 | ||
221 | edac_printk(KERN_CRIT, EDAC_LLCC, "%s: ECC_SYN%d: 0x%8x\n", | |
222 | reg_data.name, i, synd_val); | |
223 | } | |
224 | ||
225 | ret = regmap_read(drv->regmap, | |
226 | drv->offsets[bank] + reg_data.count_status_reg, | |
227 | &err_cnt); | |
228 | if (ret) | |
229 | goto clear; | |
230 | ||
231 | err_cnt &= reg_data.count_mask; | |
232 | err_cnt >>= reg_data.count_shift; | |
233 | edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error count: 0x%4x\n", | |
234 | reg_data.name, err_cnt); | |
235 | ||
236 | ret = regmap_read(drv->regmap, | |
237 | drv->offsets[bank] + reg_data.ways_status_reg, | |
238 | &err_ways); | |
239 | if (ret) | |
240 | goto clear; | |
241 | ||
242 | err_ways &= reg_data.ways_mask; | |
243 | err_ways >>= reg_data.ways_shift; | |
244 | ||
245 | edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error ways: 0x%4x\n", | |
246 | reg_data.name, err_ways); | |
247 | ||
248 | clear: | |
249 | return qcom_llcc_clear_error_status(err_type, drv); | |
250 | } | |
251 | ||
252 | static int | |
253 | dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank) | |
254 | { | |
255 | struct llcc_drv_data *drv = edev_ctl->pvt_info; | |
256 | int ret; | |
257 | ||
258 | ret = dump_syn_reg_values(drv, bank, err_type); | |
259 | if (ret) | |
260 | return ret; | |
261 | ||
262 | switch (err_type) { | |
263 | case LLCC_DRAM_CE: | |
264 | edac_device_handle_ce(edev_ctl, 0, bank, | |
265 | "LLCC Data RAM correctable Error"); | |
266 | break; | |
267 | case LLCC_DRAM_UE: | |
268 | edac_device_handle_ue(edev_ctl, 0, bank, | |
269 | "LLCC Data RAM uncorrectable Error"); | |
270 | break; | |
271 | case LLCC_TRAM_CE: | |
272 | edac_device_handle_ce(edev_ctl, 0, bank, | |
273 | "LLCC Tag RAM correctable Error"); | |
274 | break; | |
275 | case LLCC_TRAM_UE: | |
276 | edac_device_handle_ue(edev_ctl, 0, bank, | |
277 | "LLCC Tag RAM uncorrectable Error"); | |
278 | break; | |
279 | default: | |
280 | ret = -EINVAL; | |
281 | edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n", | |
282 | err_type); | |
283 | } | |
284 | ||
285 | return ret; | |
286 | } | |
287 | ||
288 | static irqreturn_t | |
289 | llcc_ecc_irq_handler(int irq, void *edev_ctl) | |
290 | { | |
291 | struct edac_device_ctl_info *edac_dev_ctl = edev_ctl; | |
292 | struct llcc_drv_data *drv = edac_dev_ctl->pvt_info; | |
293 | irqreturn_t irq_rc = IRQ_NONE; | |
294 | u32 drp_error, trp_error, i; | |
27450653 CK |
295 | int ret; |
296 | ||
297 | /* Iterate over the banks and look for Tag RAM or Data RAM errors */ | |
298 | for (i = 0; i < drv->num_banks; i++) { | |
299 | ret = regmap_read(drv->regmap, | |
300 | drv->offsets[i] + DRP_INTERRUPT_STATUS, | |
301 | &drp_error); | |
302 | ||
303 | if (!ret && (drp_error & SB_ECC_ERROR)) { | |
304 | edac_printk(KERN_CRIT, EDAC_LLCC, | |
305 | "Single Bit Error detected in Data RAM\n"); | |
306 | ret = dump_syn_reg(edev_ctl, LLCC_DRAM_CE, i); | |
307 | } else if (!ret && (drp_error & DB_ECC_ERROR)) { | |
308 | edac_printk(KERN_CRIT, EDAC_LLCC, | |
309 | "Double Bit Error detected in Data RAM\n"); | |
310 | ret = dump_syn_reg(edev_ctl, LLCC_DRAM_UE, i); | |
311 | } | |
312 | if (!ret) | |
8fd8cbfe | 313 | irq_rc = IRQ_HANDLED; |
27450653 CK |
314 | |
315 | ret = regmap_read(drv->regmap, | |
316 | drv->offsets[i] + TRP_INTERRUPT_0_STATUS, | |
317 | &trp_error); | |
318 | ||
319 | if (!ret && (trp_error & SB_ECC_ERROR)) { | |
320 | edac_printk(KERN_CRIT, EDAC_LLCC, | |
321 | "Single Bit Error detected in Tag RAM\n"); | |
322 | ret = dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i); | |
323 | } else if (!ret && (trp_error & DB_ECC_ERROR)) { | |
324 | edac_printk(KERN_CRIT, EDAC_LLCC, | |
325 | "Double Bit Error detected in Tag RAM\n"); | |
326 | ret = dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i); | |
327 | } | |
328 | if (!ret) | |
8fd8cbfe | 329 | irq_rc = IRQ_HANDLED; |
27450653 CK |
330 | } |
331 | ||
27450653 CK |
332 | return irq_rc; |
333 | } | |
334 | ||
335 | static int qcom_llcc_edac_probe(struct platform_device *pdev) | |
336 | { | |
337 | struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data; | |
338 | struct edac_device_ctl_info *edev_ctl; | |
339 | struct device *dev = &pdev->dev; | |
340 | int ecc_irq; | |
341 | int rc; | |
342 | ||
343 | rc = qcom_llcc_core_setup(llcc_driv_data->bcast_regmap); | |
344 | if (rc) | |
345 | return rc; | |
346 | ||
347 | /* Allocate edac control info */ | |
348 | edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank", | |
349 | llcc_driv_data->num_banks, 1, | |
350 | NULL, 0, | |
351 | edac_device_alloc_index()); | |
352 | ||
353 | if (!edev_ctl) | |
354 | return -ENOMEM; | |
355 | ||
356 | edev_ctl->dev = dev; | |
357 | edev_ctl->mod_name = dev_name(dev); | |
358 | edev_ctl->dev_name = dev_name(dev); | |
359 | edev_ctl->ctl_name = "llcc"; | |
360 | edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE; | |
361 | edev_ctl->pvt_info = llcc_driv_data; | |
362 | ||
363 | rc = edac_device_add_device(edev_ctl); | |
364 | if (rc) | |
365 | goto out_mem; | |
366 | ||
367 | platform_set_drvdata(pdev, edev_ctl); | |
368 | ||
369 | /* Request for ecc irq */ | |
370 | ecc_irq = llcc_driv_data->ecc_irq; | |
371 | if (ecc_irq < 0) { | |
372 | rc = -ENODEV; | |
373 | goto out_dev; | |
374 | } | |
375 | rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler, | |
376 | IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl); | |
377 | if (rc) | |
378 | goto out_dev; | |
379 | ||
380 | return rc; | |
381 | ||
382 | out_dev: | |
383 | edac_device_del_device(edev_ctl->dev); | |
384 | out_mem: | |
385 | edac_device_free_ctl_info(edev_ctl); | |
386 | ||
387 | return rc; | |
388 | } | |
389 | ||
390 | static int qcom_llcc_edac_remove(struct platform_device *pdev) | |
391 | { | |
392 | struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev); | |
393 | ||
394 | edac_device_del_device(edev_ctl->dev); | |
395 | edac_device_free_ctl_info(edev_ctl); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static struct platform_driver qcom_llcc_edac_driver = { | |
401 | .probe = qcom_llcc_edac_probe, | |
402 | .remove = qcom_llcc_edac_remove, | |
403 | .driver = { | |
404 | .name = "qcom_llcc_edac", | |
405 | }, | |
406 | }; | |
407 | module_platform_driver(qcom_llcc_edac_driver); | |
408 | ||
409 | MODULE_DESCRIPTION("QCOM EDAC driver"); | |
410 | MODULE_LICENSE("GPL v2"); |