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_LB_CNT_MASK GENMASK(31, 28)
25 #define LLCC_LB_CNT_SHIFT 28
26
27 /* Mask and shift macros */
28 #define ECC_DB_ERR_COUNT_MASK GENMASK(4, 0)
29 #define ECC_DB_ERR_WAYS_MASK GENMASK(31, 16)
30 #define ECC_DB_ERR_WAYS_SHIFT BIT(4)
31
32 #define ECC_SB_ERR_COUNT_MASK GENMASK(23, 16)
33 #define ECC_SB_ERR_COUNT_SHIFT BIT(4)
34 #define ECC_SB_ERR_WAYS_MASK GENMASK(15, 0)
35
36 #define SB_ECC_ERROR BIT(0)
37 #define DB_ECC_ERROR BIT(1)
38
39 #define DRP_TRP_INT_CLEAR GENMASK(1, 0)
40 #define DRP_TRP_CNT_CLEAR GENMASK(1, 0)
41
42 #define SB_ERROR_THRESHOLD 0x1
43 #define SB_ERROR_THRESHOLD_SHIFT 24
44 #define SB_DB_TRP_INTERRUPT_ENABLE 0x3
45 #define TRP0_INTERRUPT_ENABLE 0x1
46 #define DRP0_INTERRUPT_ENABLE BIT(6)
47 #define SB_DB_DRP_INTERRUPT_ENABLE 0x3
48
49 #define ECC_POLL_MSEC 5000
50
51 enum {
52 LLCC_DRAM_CE = 0,
53 LLCC_DRAM_UE,
54 LLCC_TRAM_CE,
55 LLCC_TRAM_UE,
56 };
57
58 static const struct llcc_edac_reg_data edac_reg_data[] = {
59 [LLCC_DRAM_CE] = {
60 .name = "DRAM Single-bit",
61 .reg_cnt = DRP_SYN_REG_CNT,
62 .count_mask = ECC_SB_ERR_COUNT_MASK,
63 .ways_mask = ECC_SB_ERR_WAYS_MASK,
64 .count_shift = ECC_SB_ERR_COUNT_SHIFT,
65 },
66 [LLCC_DRAM_UE] = {
67 .name = "DRAM Double-bit",
68 .reg_cnt = DRP_SYN_REG_CNT,
69 .count_mask = ECC_DB_ERR_COUNT_MASK,
70 .ways_mask = ECC_DB_ERR_WAYS_MASK,
71 .ways_shift = ECC_DB_ERR_WAYS_SHIFT,
72 },
73 [LLCC_TRAM_CE] = {
74 .name = "TRAM Single-bit",
75 .reg_cnt = TRP_SYN_REG_CNT,
76 .count_mask = ECC_SB_ERR_COUNT_MASK,
77 .ways_mask = ECC_SB_ERR_WAYS_MASK,
78 .count_shift = ECC_SB_ERR_COUNT_SHIFT,
79 },
80 [LLCC_TRAM_UE] = {
81 .name = "TRAM Double-bit",
82 .reg_cnt = TRP_SYN_REG_CNT,
83 .count_mask = ECC_DB_ERR_COUNT_MASK,
84 .ways_mask = ECC_DB_ERR_WAYS_MASK,
85 .ways_shift = ECC_DB_ERR_WAYS_SHIFT,
86 },
87 };
88
qcom_llcc_core_setup(struct llcc_drv_data * drv,struct regmap * llcc_bcast_regmap)89 static int qcom_llcc_core_setup(struct llcc_drv_data *drv, struct regmap *llcc_bcast_regmap)
90 {
91 u32 sb_err_threshold;
92 int ret;
93
94 /*
95 * Configure interrupt enable registers such that Tag, Data RAM related
96 * interrupts are propagated to interrupt controller for servicing
97 */
98 ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
99 TRP0_INTERRUPT_ENABLE,
100 TRP0_INTERRUPT_ENABLE);
101 if (ret)
102 return ret;
103
104 ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->trp_interrupt_0_enable,
105 SB_DB_TRP_INTERRUPT_ENABLE,
106 SB_DB_TRP_INTERRUPT_ENABLE);
107 if (ret)
108 return ret;
109
110 sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT);
111 ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_ecc_error_cfg,
112 sb_err_threshold);
113 if (ret)
114 return ret;
115
116 ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
117 DRP0_INTERRUPT_ENABLE,
118 DRP0_INTERRUPT_ENABLE);
119 if (ret)
120 return ret;
121
122 ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_interrupt_enable,
123 SB_DB_DRP_INTERRUPT_ENABLE);
124 return ret;
125 }
126
127 /* Clear the error interrupt and counter registers */
128 static int
qcom_llcc_clear_error_status(int err_type,struct llcc_drv_data * drv)129 qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv)
130 {
131 int ret;
132
133 switch (err_type) {
134 case LLCC_DRAM_CE:
135 case LLCC_DRAM_UE:
136 ret = regmap_write(drv->bcast_regmap,
137 drv->edac_reg_offset->drp_interrupt_clear,
138 DRP_TRP_INT_CLEAR);
139 if (ret)
140 return ret;
141
142 ret = regmap_write(drv->bcast_regmap,
143 drv->edac_reg_offset->drp_ecc_error_cntr_clear,
144 DRP_TRP_CNT_CLEAR);
145 if (ret)
146 return ret;
147 break;
148 case LLCC_TRAM_CE:
149 case LLCC_TRAM_UE:
150 ret = regmap_write(drv->bcast_regmap,
151 drv->edac_reg_offset->trp_interrupt_0_clear,
152 DRP_TRP_INT_CLEAR);
153 if (ret)
154 return ret;
155
156 ret = regmap_write(drv->bcast_regmap,
157 drv->edac_reg_offset->trp_ecc_error_cntr_clear,
158 DRP_TRP_CNT_CLEAR);
159 if (ret)
160 return ret;
161 break;
162 default:
163 ret = -EINVAL;
164 edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
165 err_type);
166 }
167 return ret;
168 }
169
170 struct qcom_llcc_syn_regs {
171 u32 synd_reg;
172 u32 count_status_reg;
173 u32 ways_status_reg;
174 };
175
get_reg_offsets(struct llcc_drv_data * drv,int err_type,struct qcom_llcc_syn_regs * syn_regs)176 static void get_reg_offsets(struct llcc_drv_data *drv, int err_type,
177 struct qcom_llcc_syn_regs *syn_regs)
178 {
179 const struct llcc_edac_reg_offset *edac_reg_offset = drv->edac_reg_offset;
180
181 switch (err_type) {
182 case LLCC_DRAM_CE:
183 syn_regs->synd_reg = edac_reg_offset->drp_ecc_sb_err_syn0;
184 syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
185 syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
186 break;
187 case LLCC_DRAM_UE:
188 syn_regs->synd_reg = edac_reg_offset->drp_ecc_db_err_syn0;
189 syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
190 syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
191 break;
192 case LLCC_TRAM_CE:
193 syn_regs->synd_reg = edac_reg_offset->trp_ecc_sb_err_syn0;
194 syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
195 syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
196 break;
197 case LLCC_TRAM_UE:
198 syn_regs->synd_reg = edac_reg_offset->trp_ecc_db_err_syn0;
199 syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
200 syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
201 break;
202 }
203 }
204
205 /* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/
206 static int
dump_syn_reg_values(struct llcc_drv_data * drv,u32 bank,int err_type)207 dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
208 {
209 struct llcc_edac_reg_data reg_data = edac_reg_data[err_type];
210 struct qcom_llcc_syn_regs regs = { };
211 int err_cnt, err_ways, ret, i;
212 u32 synd_reg, synd_val;
213
214 get_reg_offsets(drv, err_type, ®s);
215
216 for (i = 0; i < reg_data.reg_cnt; i++) {
217 synd_reg = regs.synd_reg + (i * 4);
218 ret = regmap_read(drv->regmaps[bank], synd_reg,
219 &synd_val);
220 if (ret)
221 goto clear;
222
223 edac_printk(KERN_CRIT, EDAC_LLCC, "%s: ECC_SYN%d: 0x%8x\n",
224 reg_data.name, i, synd_val);
225 }
226
227 ret = regmap_read(drv->regmaps[bank], regs.count_status_reg,
228 &err_cnt);
229 if (ret)
230 goto clear;
231
232 err_cnt &= reg_data.count_mask;
233 err_cnt >>= reg_data.count_shift;
234 edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error count: 0x%4x\n",
235 reg_data.name, err_cnt);
236
237 ret = regmap_read(drv->regmaps[bank], regs.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
dump_syn_reg(struct edac_device_ctl_info * edev_ctl,int err_type,u32 bank)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->dev->platform_data;
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
llcc_ecc_irq_handler(int irq,void * edev_ctl)288 static irqreturn_t llcc_ecc_irq_handler(int irq, void *edev_ctl)
289 {
290 struct edac_device_ctl_info *edac_dev_ctl = edev_ctl;
291 struct llcc_drv_data *drv = edac_dev_ctl->dev->platform_data;
292 irqreturn_t irq_rc = IRQ_NONE;
293 u32 drp_error, trp_error, i;
294 int ret;
295
296 /* Iterate over the banks and look for Tag RAM or Data RAM errors */
297 for (i = 0; i < drv->num_banks; i++) {
298 ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->drp_interrupt_status,
299 &drp_error);
300
301 if (!ret && (drp_error & SB_ECC_ERROR)) {
302 edac_printk(KERN_CRIT, EDAC_LLCC,
303 "Single Bit Error detected in Data RAM\n");
304 ret = dump_syn_reg(edev_ctl, LLCC_DRAM_CE, i);
305 } else if (!ret && (drp_error & DB_ECC_ERROR)) {
306 edac_printk(KERN_CRIT, EDAC_LLCC,
307 "Double Bit Error detected in Data RAM\n");
308 ret = dump_syn_reg(edev_ctl, LLCC_DRAM_UE, i);
309 }
310 if (!ret)
311 irq_rc = IRQ_HANDLED;
312
313 ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->trp_interrupt_0_status,
314 &trp_error);
315
316 if (!ret && (trp_error & SB_ECC_ERROR)) {
317 edac_printk(KERN_CRIT, EDAC_LLCC,
318 "Single Bit Error detected in Tag RAM\n");
319 ret = dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i);
320 } else if (!ret && (trp_error & DB_ECC_ERROR)) {
321 edac_printk(KERN_CRIT, EDAC_LLCC,
322 "Double Bit Error detected in Tag RAM\n");
323 ret = dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i);
324 }
325 if (!ret)
326 irq_rc = IRQ_HANDLED;
327 }
328
329 return irq_rc;
330 }
331
llcc_ecc_check(struct edac_device_ctl_info * edev_ctl)332 static void llcc_ecc_check(struct edac_device_ctl_info *edev_ctl)
333 {
334 llcc_ecc_irq_handler(0, edev_ctl);
335 }
336
qcom_llcc_edac_probe(struct platform_device * pdev)337 static int qcom_llcc_edac_probe(struct platform_device *pdev)
338 {
339 struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data;
340 struct edac_device_ctl_info *edev_ctl;
341 struct device *dev = &pdev->dev;
342 int ecc_irq;
343 int rc;
344
345 if (!llcc_driv_data->ecc_irq_configured) {
346 rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
347 if (rc)
348 return rc;
349 }
350
351 /* Allocate edac control info */
352 edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank",
353 llcc_driv_data->num_banks, 1,
354 edac_device_alloc_index());
355
356 if (!edev_ctl)
357 return -ENOMEM;
358
359 edev_ctl->dev = dev;
360 edev_ctl->mod_name = dev_name(dev);
361 edev_ctl->dev_name = dev_name(dev);
362 edev_ctl->ctl_name = "llcc";
363 edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;
364
365 /* Check if LLCC driver has passed ECC IRQ */
366 ecc_irq = llcc_driv_data->ecc_irq;
367 if (ecc_irq > 0) {
368 /* Use interrupt mode if IRQ is available */
369 rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler,
370 IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
371 if (!rc) {
372 edac_op_state = EDAC_OPSTATE_INT;
373 goto irq_done;
374 }
375 }
376
377 /* Fall back to polling mode otherwise */
378 edev_ctl->poll_msec = ECC_POLL_MSEC;
379 edev_ctl->edac_check = llcc_ecc_check;
380 edac_op_state = EDAC_OPSTATE_POLL;
381
382 irq_done:
383 rc = edac_device_add_device(edev_ctl);
384 if (rc) {
385 edac_device_free_ctl_info(edev_ctl);
386 return rc;
387 }
388
389 platform_set_drvdata(pdev, edev_ctl);
390
391 return rc;
392 }
393
qcom_llcc_edac_remove(struct platform_device * pdev)394 static void qcom_llcc_edac_remove(struct platform_device *pdev)
395 {
396 struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev);
397
398 edac_device_del_device(edev_ctl->dev);
399 edac_device_free_ctl_info(edev_ctl);
400 }
401
402 static const struct platform_device_id qcom_llcc_edac_id_table[] = {
403 { .name = "qcom_llcc_edac" },
404 {}
405 };
406 MODULE_DEVICE_TABLE(platform, qcom_llcc_edac_id_table);
407
408 static struct platform_driver qcom_llcc_edac_driver = {
409 .probe = qcom_llcc_edac_probe,
410 .remove_new = qcom_llcc_edac_remove,
411 .driver = {
412 .name = "qcom_llcc_edac",
413 },
414 .id_table = qcom_llcc_edac_id_table,
415 };
416 module_platform_driver(qcom_llcc_edac_driver);
417
418 MODULE_DESCRIPTION("QCOM EDAC driver");
419 MODULE_LICENSE("GPL v2");
420