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->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 } 287 288 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->dev->platform_data; 293 irqreturn_t irq_rc = IRQ_NONE; 294 u32 drp_error, trp_error, i; 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) 313 irq_rc = IRQ_HANDLED; 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) 329 irq_rc = IRQ_HANDLED; 330 } 331 332 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; 361 362 rc = edac_device_add_device(edev_ctl); 363 if (rc) 364 goto out_mem; 365 366 platform_set_drvdata(pdev, edev_ctl); 367 368 /* Request for ecc irq */ 369 ecc_irq = llcc_driv_data->ecc_irq; 370 if (ecc_irq < 0) { 371 rc = -ENODEV; 372 goto out_dev; 373 } 374 rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler, 375 IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl); 376 if (rc) 377 goto out_dev; 378 379 return rc; 380 381 out_dev: 382 edac_device_del_device(edev_ctl->dev); 383 out_mem: 384 edac_device_free_ctl_info(edev_ctl); 385 386 return rc; 387 } 388 389 static int qcom_llcc_edac_remove(struct platform_device *pdev) 390 { 391 struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev); 392 393 edac_device_del_device(edev_ctl->dev); 394 edac_device_free_ctl_info(edev_ctl); 395 396 return 0; 397 } 398 399 static struct platform_driver qcom_llcc_edac_driver = { 400 .probe = qcom_llcc_edac_probe, 401 .remove = qcom_llcc_edac_remove, 402 .driver = { 403 .name = "qcom_llcc_edac", 404 }, 405 }; 406 module_platform_driver(qcom_llcc_edac_driver); 407 408 MODULE_DESCRIPTION("QCOM EDAC driver"); 409 MODULE_LICENSE("GPL v2"); 410