diff options
Diffstat (limited to 'drivers/edac/qcom_edac.c')
| -rw-r--r-- | drivers/edac/qcom_edac.c | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c new file mode 100644 index 000000000000..82bd775124f2 --- /dev/null +++ b/drivers/edac/qcom_edac.c @@ -0,0 +1,414 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018, The Linux Foundation. All rights reserved. + */ + +#include <linux/edac.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/soc/qcom/llcc-qcom.h> + +#include "edac_mc.h" +#include "edac_device.h" + +#define EDAC_LLCC "qcom_llcc" + +#define LLCC_ERP_PANIC_ON_UE 1 + +#define TRP_SYN_REG_CNT 6 +#define DRP_SYN_REG_CNT 8 + +#define LLCC_COMMON_STATUS0 0x0003000c +#define LLCC_LB_CNT_MASK GENMASK(31, 28) +#define LLCC_LB_CNT_SHIFT 28 + +/* Single & double bit syndrome register offsets */ +#define TRP_ECC_SB_ERR_SYN0 0x0002304c +#define TRP_ECC_DB_ERR_SYN0 0x00020370 +#define DRP_ECC_SB_ERR_SYN0 0x0004204c +#define DRP_ECC_DB_ERR_SYN0 0x00042070 + +/* Error register offsets */ +#define TRP_ECC_ERROR_STATUS1 0x00020348 +#define TRP_ECC_ERROR_STATUS0 0x00020344 +#define DRP_ECC_ERROR_STATUS1 0x00042048 +#define DRP_ECC_ERROR_STATUS0 0x00042044 + +/* TRP, DRP interrupt register offsets */ +#define DRP_INTERRUPT_STATUS 0x00041000 +#define TRP_INTERRUPT_0_STATUS 0x00020480 +#define DRP_INTERRUPT_CLEAR 0x00041008 +#define DRP_ECC_ERROR_CNTR_CLEAR 0x00040004 +#define TRP_INTERRUPT_0_CLEAR 0x00020484 +#define TRP_ECC_ERROR_CNTR_CLEAR 0x00020440 + +/* Mask and shift macros */ +#define ECC_DB_ERR_COUNT_MASK GENMASK(4, 0) +#define ECC_DB_ERR_WAYS_MASK GENMASK(31, 16) +#define ECC_DB_ERR_WAYS_SHIFT BIT(4) + +#define ECC_SB_ERR_COUNT_MASK GENMASK(23, 16) +#define ECC_SB_ERR_COUNT_SHIFT BIT(4) +#define ECC_SB_ERR_WAYS_MASK GENMASK(15, 0) + +#define SB_ECC_ERROR BIT(0) +#define DB_ECC_ERROR BIT(1) + +#define DRP_TRP_INT_CLEAR GENMASK(1, 0) +#define DRP_TRP_CNT_CLEAR GENMASK(1, 0) + +/* Config registers offsets*/ +#define DRP_ECC_ERROR_CFG 0x00040000 + +/* Tag RAM, Data RAM interrupt register offsets */ +#define CMN_INTERRUPT_0_ENABLE 0x0003001c +#define CMN_INTERRUPT_2_ENABLE 0x0003003c +#define TRP_INTERRUPT_0_ENABLE 0x00020488 +#define DRP_INTERRUPT_ENABLE 0x0004100c + +#define SB_ERROR_THRESHOLD 0x1 +#define SB_ERROR_THRESHOLD_SHIFT 24 +#define SB_DB_TRP_INTERRUPT_ENABLE 0x3 +#define TRP0_INTERRUPT_ENABLE 0x1 +#define DRP0_INTERRUPT_ENABLE BIT(6) +#define SB_DB_DRP_INTERRUPT_ENABLE 0x3 + +enum { + LLCC_DRAM_CE = 0, + LLCC_DRAM_UE, + LLCC_TRAM_CE, + LLCC_TRAM_UE, +}; + +static const struct llcc_edac_reg_data edac_reg_data[] = { + [LLCC_DRAM_CE] = { + .name = "DRAM Single-bit", + .synd_reg = DRP_ECC_SB_ERR_SYN0, + .count_status_reg = DRP_ECC_ERROR_STATUS1, + .ways_status_reg = DRP_ECC_ERROR_STATUS0, + .reg_cnt = DRP_SYN_REG_CNT, + .count_mask = ECC_SB_ERR_COUNT_MASK, + .ways_mask = ECC_SB_ERR_WAYS_MASK, + .count_shift = ECC_SB_ERR_COUNT_SHIFT, + }, + [LLCC_DRAM_UE] = { + .name = "DRAM Double-bit", + .synd_reg = DRP_ECC_DB_ERR_SYN0, + .count_status_reg = DRP_ECC_ERROR_STATUS1, + .ways_status_reg = DRP_ECC_ERROR_STATUS0, + .reg_cnt = DRP_SYN_REG_CNT, + .count_mask = ECC_DB_ERR_COUNT_MASK, + .ways_mask = ECC_DB_ERR_WAYS_MASK, + .ways_shift = ECC_DB_ERR_WAYS_SHIFT, + }, + [LLCC_TRAM_CE] = { + .name = "TRAM Single-bit", + .synd_reg = TRP_ECC_SB_ERR_SYN0, + .count_status_reg = TRP_ECC_ERROR_STATUS1, + .ways_status_reg = TRP_ECC_ERROR_STATUS0, + .reg_cnt = TRP_SYN_REG_CNT, + .count_mask = ECC_SB_ERR_COUNT_MASK, + .ways_mask = ECC_SB_ERR_WAYS_MASK, + .count_shift = ECC_SB_ERR_COUNT_SHIFT, + }, + [LLCC_TRAM_UE] = { + .name = "TRAM Double-bit", + .synd_reg = TRP_ECC_DB_ERR_SYN0, + .count_status_reg = TRP_ECC_ERROR_STATUS1, + .ways_status_reg = TRP_ECC_ERROR_STATUS0, + .reg_cnt = TRP_SYN_REG_CNT, + .count_mask = ECC_DB_ERR_COUNT_MASK, + .ways_mask = ECC_DB_ERR_WAYS_MASK, + .ways_shift = ECC_DB_ERR_WAYS_SHIFT, + }, +}; + +static int qcom_llcc_core_setup(struct regmap *llcc_bcast_regmap) +{ + u32 sb_err_threshold; + int ret; + + /* + * Configure interrupt enable registers such that Tag, Data RAM related + * interrupts are propagated to interrupt controller for servicing + */ + ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE, + TRP0_INTERRUPT_ENABLE, + TRP0_INTERRUPT_ENABLE); + if (ret) + return ret; + + ret = regmap_update_bits(llcc_bcast_regmap, TRP_INTERRUPT_0_ENABLE, + SB_DB_TRP_INTERRUPT_ENABLE, + SB_DB_TRP_INTERRUPT_ENABLE); + if (ret) + return ret; + + sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT); + ret = regmap_write(llcc_bcast_regmap, DRP_ECC_ERROR_CFG, + sb_err_threshold); + if (ret) + return ret; + + ret = regmap_update_bits(llcc_bcast_regmap, CMN_INTERRUPT_2_ENABLE, + DRP0_INTERRUPT_ENABLE, + DRP0_INTERRUPT_ENABLE); + if (ret) + return ret; + + ret = regmap_write(llcc_bcast_regmap, DRP_INTERRUPT_ENABLE, + SB_DB_DRP_INTERRUPT_ENABLE); + return ret; +} + +/* Clear the error interrupt and counter registers */ +static int +qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv) +{ + int ret = 0; + + switch (err_type) { + case LLCC_DRAM_CE: + case LLCC_DRAM_UE: + ret = regmap_write(drv->bcast_regmap, DRP_INTERRUPT_CLEAR, + DRP_TRP_INT_CLEAR); + if (ret) + return ret; + + ret = regmap_write(drv->bcast_regmap, DRP_ECC_ERROR_CNTR_CLEAR, + DRP_TRP_CNT_CLEAR); + if (ret) + return ret; + break; + case LLCC_TRAM_CE: + case LLCC_TRAM_UE: + ret = regmap_write(drv->bcast_regmap, TRP_INTERRUPT_0_CLEAR, + DRP_TRP_INT_CLEAR); + if (ret) + return ret; + + ret = regmap_write(drv->bcast_regmap, TRP_ECC_ERROR_CNTR_CLEAR, + DRP_TRP_CNT_CLEAR); + if (ret) + return ret; + break; + default: + ret = -EINVAL; + edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n", + err_type); + } + return ret; +} + +/* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/ +static int +dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type) +{ + struct llcc_edac_reg_data reg_data = edac_reg_data[err_type]; + int err_cnt, err_ways, ret, i; + u32 synd_reg, synd_val; + + for (i = 0; i < reg_data.reg_cnt; i++) { + synd_reg = reg_data.synd_reg + (i * 4); + ret = regmap_read(drv->regmap, drv->offsets[bank] + synd_reg, + &synd_val); + if (ret) + goto clear; + + edac_printk(KERN_CRIT, EDAC_LLCC, "%s: ECC_SYN%d: 0x%8x\n", + reg_data.name, i, synd_val); + } + + ret = regmap_read(drv->regmap, + drv->offsets[bank] + reg_data.count_status_reg, + &err_cnt); + if (ret) + goto clear; + + err_cnt &= reg_data.count_mask; + err_cnt >>= reg_data.count_shift; + edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error count: 0x%4x\n", + reg_data.name, err_cnt); + + ret = regmap_read(drv->regmap, + drv->offsets[bank] + reg_data.ways_status_reg, + &err_ways); + if (ret) + goto clear; + + err_ways &= reg_data.ways_mask; + err_ways >>= reg_data.ways_shift; + + edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error ways: 0x%4x\n", + reg_data.name, err_ways); + +clear: + return qcom_llcc_clear_error_status(err_type, drv); +} + +static int +dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank) +{ + struct llcc_drv_data *drv = edev_ctl->pvt_info; + int ret; + + ret = dump_syn_reg_values(drv, bank, err_type); + if (ret) + return ret; + + switch (err_type) { + case LLCC_DRAM_CE: + edac_device_handle_ce(edev_ctl, 0, bank, + "LLCC Data RAM correctable Error"); + break; + case LLCC_DRAM_UE: + edac_device_handle_ue(edev_ctl, 0, bank, + "LLCC Data RAM uncorrectable Error"); + break; + case LLCC_TRAM_CE: + edac_device_handle_ce(edev_ctl, 0, bank, + "LLCC Tag RAM correctable Error"); + break; + case LLCC_TRAM_UE: + edac_device_handle_ue(edev_ctl, 0, bank, + "LLCC Tag RAM uncorrectable Error"); + break; + default: + ret = -EINVAL; + edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n", + err_type); + } + + return ret; +} + +static irqreturn_t +llcc_ecc_irq_handler(int irq, void *edev_ctl) +{ + struct edac_device_ctl_info *edac_dev_ctl = edev_ctl; + struct llcc_drv_data *drv = edac_dev_ctl->pvt_info; + irqreturn_t irq_rc = IRQ_NONE; + u32 drp_error, trp_error, i; + bool irq_handled; + int ret; + + /* Iterate over the banks and look for Tag RAM or Data RAM errors */ + for (i = 0; i < drv->num_banks; i++) { + ret = regmap_read(drv->regmap, + drv->offsets[i] + DRP_INTERRUPT_STATUS, + &drp_error); + + if (!ret && (drp_error & SB_ECC_ERROR)) { + edac_printk(KERN_CRIT, EDAC_LLCC, + "Single Bit Error detected in Data RAM\n"); + ret = dump_syn_reg(edev_ctl, LLCC_DRAM_CE, i); + } else if (!ret && (drp_error & DB_ECC_ERROR)) { + edac_printk(KERN_CRIT, EDAC_LLCC, + "Double Bit Error detected in Data RAM\n"); + ret = dump_syn_reg(edev_ctl, LLCC_DRAM_UE, i); + } + if (!ret) + irq_handled = true; + + ret = regmap_read(drv->regmap, + drv->offsets[i] + TRP_INTERRUPT_0_STATUS, + &trp_error); + + if (!ret && (trp_error & SB_ECC_ERROR)) { + edac_printk(KERN_CRIT, EDAC_LLCC, + "Single Bit Error detected in Tag RAM\n"); + ret = dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i); + } else if (!ret && (trp_error & DB_ECC_ERROR)) { + edac_printk(KERN_CRIT, EDAC_LLCC, + "Double Bit Error detected in Tag RAM\n"); + ret = dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i); + } + if (!ret) + irq_handled = true; + } + + if (irq_handled) + irq_rc = IRQ_HANDLED; + + return irq_rc; +} + +static int qcom_llcc_edac_probe(struct platform_device *pdev) +{ + struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data; + struct edac_device_ctl_info *edev_ctl; + struct device *dev = &pdev->dev; + int ecc_irq; + int rc; + + rc = qcom_llcc_core_setup(llcc_driv_data->bcast_regmap); + if (rc) + return rc; + + /* Allocate edac control info */ + edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank", + llcc_driv_data->num_banks, 1, + NULL, 0, + edac_device_alloc_index()); + + if (!edev_ctl) + return -ENOMEM; + + edev_ctl->dev = dev; + edev_ctl->mod_name = dev_name(dev); + edev_ctl->dev_name = dev_name(dev); + edev_ctl->ctl_name = "llcc"; + edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE; + edev_ctl->pvt_info = llcc_driv_data; + + rc = edac_device_add_device(edev_ctl); + if (rc) + goto out_mem; + + platform_set_drvdata(pdev, edev_ctl); + + /* Request for ecc irq */ + ecc_irq = llcc_driv_data->ecc_irq; + if (ecc_irq < 0) { + rc = -ENODEV; + goto out_dev; + } + rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler, + IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl); + if (rc) + goto out_dev; + + return rc; + +out_dev: + edac_device_del_device(edev_ctl->dev); +out_mem: + edac_device_free_ctl_info(edev_ctl); + + return rc; +} + +static int qcom_llcc_edac_remove(struct platform_device *pdev) +{ + struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev); + + edac_device_del_device(edev_ctl->dev); + edac_device_free_ctl_info(edev_ctl); + + return 0; +} + +static struct platform_driver qcom_llcc_edac_driver = { + .probe = qcom_llcc_edac_probe, + .remove = qcom_llcc_edac_remove, + .driver = { + .name = "qcom_llcc_edac", + }, +}; +module_platform_driver(qcom_llcc_edac_driver); + +MODULE_DESCRIPTION("QCOM EDAC driver"); +MODULE_LICENSE("GPL v2"); |