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 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 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 }; 175 176 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 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 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 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 } 331 332 static void llcc_ecc_check(struct edac_device_ctl_info *edev_ctl) 333 { 334 llcc_ecc_irq_handler(0, edev_ctl); 335 } 336 337 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 rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap); 346 if (rc) 347 return rc; 348 349 /* Allocate edac control info */ 350 edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank", 351 llcc_driv_data->num_banks, 1, 352 NULL, 0, 353 edac_device_alloc_index()); 354 355 if (!edev_ctl) 356 return -ENOMEM; 357 358 edev_ctl->dev = dev; 359 edev_ctl->mod_name = dev_name(dev); 360 edev_ctl->dev_name = dev_name(dev); 361 edev_ctl->ctl_name = "llcc"; 362 edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE; 363 364 /* Check if LLCC driver has passed ECC IRQ */ 365 ecc_irq = llcc_driv_data->ecc_irq; 366 if (ecc_irq > 0) { 367 /* Use interrupt mode if IRQ is available */ 368 rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler, 369 IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl); 370 if (!rc) { 371 edac_op_state = EDAC_OPSTATE_INT; 372 goto irq_done; 373 } 374 } 375 376 /* Fall back to polling mode otherwise */ 377 edev_ctl->poll_msec = ECC_POLL_MSEC; 378 edev_ctl->edac_check = llcc_ecc_check; 379 edac_op_state = EDAC_OPSTATE_POLL; 380 381 irq_done: 382 rc = edac_device_add_device(edev_ctl); 383 if (rc) { 384 edac_device_free_ctl_info(edev_ctl); 385 return rc; 386 } 387 388 platform_set_drvdata(pdev, edev_ctl); 389 390 return rc; 391 } 392 393 static int qcom_llcc_edac_remove(struct platform_device *pdev) 394 { 395 struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev); 396 397 edac_device_del_device(edev_ctl->dev); 398 edac_device_free_ctl_info(edev_ctl); 399 400 return 0; 401 } 402 403 static const struct platform_device_id qcom_llcc_edac_id_table[] = { 404 { .name = "qcom_llcc_edac" }, 405 {} 406 }; 407 MODULE_DEVICE_TABLE(platform, qcom_llcc_edac_id_table); 408 409 static struct platform_driver qcom_llcc_edac_driver = { 410 .probe = qcom_llcc_edac_probe, 411 .remove = qcom_llcc_edac_remove, 412 .driver = { 413 .name = "qcom_llcc_edac", 414 }, 415 .id_table = qcom_llcc_edac_id_table, 416 }; 417 module_platform_driver(qcom_llcc_edac_driver); 418 419 MODULE_DESCRIPTION("QCOM EDAC driver"); 420 MODULE_LICENSE("GPL v2"); 421