From patchwork Tue Jan 14 23:52:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiping Ji X-Patchwork-Id: 11332989 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AF92B92A for ; Tue, 14 Jan 2020 23:52:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 667692467A for ; Tue, 14 Jan 2020 23:52:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="MA850ouT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728759AbgANXw0 (ORCPT ); Tue, 14 Jan 2020 18:52:26 -0500 Received: from mail-pj1-f68.google.com ([209.85.216.68]:35086 "EHLO mail-pj1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728757AbgANXw0 (ORCPT ); Tue, 14 Jan 2020 18:52:26 -0500 Received: by mail-pj1-f68.google.com with SMTP id s7so6667426pjc.0; Tue, 14 Jan 2020 15:52:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:subject:to:cc:message-id:date:user-agent:mime-version :content-language:content-transfer-encoding; bh=dz8g12oljRS/YvM6r8pDsqR3EAR/ZP8K3kA1giN+Ix0=; b=MA850ouT60aG9qnHQZLeQ7xOZBhnV7jV67sp7BsTJTUefQXHGurmP1wJqbnFNe40JG r3cBuW8vscrfrW5/RSoxH6koq+64nwN6X/tzWg8nONqLADbkvDiUzku5l5MY3+lTXUDj 5NMfahaFS4drdWTPNsrFaC/eOcGAR1CC3zgFV0QL9RlqqbLe58Jf50p3ClXIaNCU63HM 1F7lzqjjHltNLnQ/+dTFY1CwtZh9msXYkQofU0ILIzjYUnH4RMjnMu2oV/NiB9zcL6Ui BFcW3q23ziMWJmjsNB4nIS/gLlF4nukJbuKu2ELNFXqd+3ynwgWnLO+XQDJL+rjAu1Z+ Dx0A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:cc:message-id:date:user-agent :mime-version:content-language:content-transfer-encoding; bh=dz8g12oljRS/YvM6r8pDsqR3EAR/ZP8K3kA1giN+Ix0=; b=DR0AxyAgnp6NqJHEPkm8GIwiLY3RQpA6jxq+nO+E08eR/sTVsBtfzNHzPDmeL/RQI1 ciTuXU/8KvlD2RNbaa9150HTAXunFByw8RuphuvqKinBM2lXasaUNltDbKjHr/auHsl7 n7nQKrykfM/f2DQ2cHf8lCa4qF9iTwHvi6c5bsP70JANuCvrliSui7Wkyp0fc1wD04pU SIvSJ79AURguthmo0zyqsWGWx63wJX3UsBKhgEuadsfSbN5GH91UD4oyEm41lLmO1F5/ xqeziNRS92/fDGLIoFc4moK1c1EaMeAa8W3g5DO9pI7YKmdCSei/QWpd+u8l3BJYAw7s o5Dg== X-Gm-Message-State: APjAAAXNc0i+Lo4oqblfUgukGhuLJf6tc0uAWdDhdhAp0VLTr7pIeDyy lQKeSVRDdrTMKYQetpkcAz4= X-Google-Smtp-Source: APXvYqz1tOnKDgQlV8kmoZnLl4JNeEZIiDJ2oKm1hx7sTawm8LbFlsBbOEEsIn/QIZN+DXTJgje+Zg== X-Received: by 2002:a17:90a:db0b:: with SMTP id g11mr31171104pjv.140.1579045944879; Tue, 14 Jan 2020 15:52:24 -0800 (PST) Received: from ?IPv6:2001:4898:d8:28:acd4:5c73:b928:d080? ([2001:4898:80e8:f:2cdd:5c73:b928:d080]) by smtp.gmail.com with ESMTPSA id l186sm18627403pge.31.2020.01.14.15.52.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Jan 2020 15:52:24 -0800 (PST) From: Shiping Ji Subject: [PATCH v8 2/2] EDAC: add EDAC driver for DMC520 To: Borislav Petkov , James Morse , robh+dt@kernel.org, mark.rutland@arm.com Cc: devicetree@vger.kernel.org, LKML , Mauro Carvalho Chehab , linux-edac@vger.kernel.org, sashal@kernel.org, hangl@microsoft.com, Lei Wang , ruizhao@microsoft.com, Scott Branden , Yuqing Shen , ray.jui@broadcom.com, wangglei@gmail.com, shji@microsoft.com Message-ID: <0cc7bcfe-0dee-b78a-a0fe-52cc48c00a44@gmail.com> Date: Tue, 14 Jan 2020 15:52:23 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 Content-Language: en-US Sender: linux-edac-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-edac@vger.kernel.org New driver supports error detection and correction on the devices with ARM DMC-520 memory controller. Signed-off-by: Shiping Ji Reviewed-by: James Morse Signed-off-by: Lei Wang --- Changes in v8: - Removed interrupt-config and replaced with an interrupt map where names and masks are predefined - Only one ISR function is defined, mask is retrieved from the interrupt map - "dram_ecc_errc" and "dram_ecc_errd" are implemented --- MAINTAINERS | 6 + drivers/edac/Kconfig | 7 + drivers/edac/Makefile | 1 + drivers/edac/dmc520_edac.c | 670 +++++++++++++++++++++++++++++++++++++ 4 files changed, 684 insertions(+) create mode 100644 drivers/edac/dmc520_edac.c diff --git a/MAINTAINERS b/MAINTAINERS index bd5847e802de..386195a019c6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5914,6 +5914,12 @@ F: Documentation/driver-api/edac.rst F: drivers/edac/ F: include/linux/edac.h +EDAC-DMC520 +M: Lei Wang +L: linux-edac@vger.kernel.org +S: Supported +F: drivers/edac/dmc520_edac.c + EDAC-E752X M: Mark Gross L: linux-edac@vger.kernel.org diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig index 37027c298323..7305bd1ec80e 100644 --- a/drivers/edac/Kconfig +++ b/drivers/edac/Kconfig @@ -523,4 +523,11 @@ config EDAC_BLUEFIELD Support for error detection and correction on the Mellanox BlueField SoCs. +config EDAC_DMC520 + tristate "ARM DMC-520 ECC" + depends on ARM64 + help + Support for error detection and correction on the + SoCs with ARM DMC-520 DRAM controller. + endif # EDAC diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile index d77200c9680b..269e15118cea 100644 --- a/drivers/edac/Makefile +++ b/drivers/edac/Makefile @@ -87,3 +87,4 @@ obj-$(CONFIG_EDAC_TI) += ti_edac.o obj-$(CONFIG_EDAC_QCOM) += qcom_edac.o obj-$(CONFIG_EDAC_ASPEED) += aspeed_edac.o obj-$(CONFIG_EDAC_BLUEFIELD) += bluefield_edac.o +obj-$(CONFIG_EDAC_DMC520) += dmc520_edac.o diff --git a/drivers/edac/dmc520_edac.c b/drivers/edac/dmc520_edac.c new file mode 100644 index 000000000000..55237c5c522c --- /dev/null +++ b/drivers/edac/dmc520_edac.c @@ -0,0 +1,670 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * EDAC driver for DMC-520 memory controller. + * + * The driver supports 10 interrupt lines, + * though only dram_ecc_errc and dram_ecc_errd are currently handled. + * + * Authors: Rui Zhao + * Lei Wang + * Shiping Ji + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "edac_mc.h" + +/* DMC-520 registers */ +#define REG_OFFSET_FEATURE_CONFIG 0x130 +#define REG_OFFSET_ECC_ERRC_COUNT_31_00 0x158 +#define REG_OFFSET_ECC_ERRC_COUNT_63_32 0x15C +#define REG_OFFSET_ECC_ERRD_COUNT_31_00 0x160 +#define REG_OFFSET_ECC_ERRD_COUNT_63_32 0x164 +#define REG_OFFSET_INTERRUPT_CONTROL 0x500 +#define REG_OFFSET_INTERRUPT_CLR 0x508 +#define REG_OFFSET_INTERRUPT_STATUS 0x510 +#define REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_31_00 0x528 +#define REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_63_32 0x52C +#define REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_31_00 0x530 +#define REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_63_32 0x534 +#define REG_OFFSET_ADDRESS_CONTROL_NOW 0x1010 +#define REG_OFFSET_MEMORY_TYPE_NOW 0x1128 +#define REG_OFFSET_SCRUB_CONTROL0_NOW 0x1170 +#define REG_OFFSET_FORMAT_CONTROL 0x18 + +/* DMC-520 types, masks and bitfields */ +#define RAM_ECC_INT_CE_BIT BIT(0) +#define RAM_ECC_INT_UE_BIT BIT(1) +#define DRAM_ECC_INT_CE_BIT BIT(2) +#define DRAM_ECC_INT_UE_BIT BIT(3) +#define FAILED_ACCESS_INT_BIT BIT(4) +#define FAILED_PROG_INT_BIT BIT(5) +#define LINK_ERR_INT_BIT BIT(6) +#define TEMPERATURE_EVENT_INT_BIT BIT(7) +#define ARCH_FSM_INT_BIT BIT(8) +#define PHY_REQUEST_INT_BIT BIT(9) +#define MEMORY_WIDTH_MASK GENMASK(1, 0) +#define SCRUB_TRIGGER0_NEXT_MASK GENMASK(1, 0) +#define REG_FIELD_DRAM_ECC_ENABLED GENMASK(1, 0) +#define REG_FIELD_MEMORY_TYPE GENMASK(2, 0) +#define REG_FIELD_DEVICE_WIDTH GENMASK(9, 8) +#define REG_FIELD_ADDRESS_CONTROL_COL GENMASK(2, 0) +#define REG_FIELD_ADDRESS_CONTROL_ROW GENMASK(10, 8) +#define REG_FIELD_ADDRESS_CONTROL_BANK GENMASK(18, 16) +#define REG_FIELD_ADDRESS_CONTROL_RANK GENMASK(25, 24) +#define REG_FIELD_ERR_INFO_LOW_VALID BIT(0) +#define REG_FIELD_ERR_INFO_LOW_COL GENMASK(10, 1) +#define REG_FIELD_ERR_INFO_LOW_ROW GENMASK(28, 11) +#define REG_FIELD_ERR_INFO_LOW_RANK GENMASK(31, 29) +#define REG_FIELD_ERR_INFO_HIGH_BANK GENMASK(3, 0) +#define REG_FIELD_ERR_INFO_HIGH_VALID BIT(31) + +#define DRAM_ADDRESS_CONTROL_MIN_COL_BITS 8 +#define DRAM_ADDRESS_CONTROL_MIN_ROW_BITS 11 + +#define DMC520_SCRUB_TRIGGER_ERR_DETECT 2 +#define DMC520_SCRUB_TRIGGER_IDLE 3 + +/* Driver settings */ +/* + * The max-length message would be: "rank:7 bank:15 row:262143 col:1023". + * Max length is 34. Using a 40-size buffer is enough. + */ +#define DMC520_MSG_BUF_SIZE 40 +#define EDAC_MOD_NAME "dmc520-edac" +#define EDAC_CTL_NAME "dmc520" + +/* the data bus width for the attached memory chips. */ +enum dmc520_mem_width { + MEM_WIDTH_X32 = 2, + MEM_WIDTH_X64 = 3 +}; + +/* memory type */ +enum dmc520_mem_type { + MEM_TYPE_DDR3 = 1, + MEM_TYPE_DDR4 = 2 +}; + +/* memory device width */ +enum dmc520_dev_width { + DEV_WIDTH_X4 = 0, + DEV_WIDTH_X8 = 1, + DEV_WIDTH_X16 = 2 +}; + +struct ecc_error_info { + u32 col; + u32 row; + u32 bank; + u32 rank; +}; + +/* The interrupt config */ +struct dmc520_irq_config { + char *name; + int mask; +}; + +/* The interrupt mappings */ +static struct dmc520_irq_config dmc520_irq_configs[] = { + { + .name = "ram_ecc_errc", + .mask = RAM_ECC_INT_CE_BIT + }, + { + .name = "ram_ecc_errd", + .mask = RAM_ECC_INT_UE_BIT + }, + { + .name = "dram_ecc_errc", + .mask = DRAM_ECC_INT_CE_BIT + }, + { + .name = "dram_ecc_errd", + .mask = DRAM_ECC_INT_UE_BIT + }, + { + .name = "failed_access", + .mask = FAILED_ACCESS_INT_BIT + }, + { + .name = "failed_prog", + .mask = FAILED_PROG_INT_BIT + }, + { + .name = "link_err", + .mask = LINK_ERR_INT_BIT + }, + { + .name = "temperature_event", + .mask = TEMPERATURE_EVENT_INT_BIT + }, + { + .name = "arch_fsm", + .mask = ARCH_FSM_INT_BIT + }, + { + .name = "phy_request", + .mask = PHY_REQUEST_INT_BIT + } +}; + +#define NUMBER_OF_IRQS ARRAY_SIZE(dmc520_irq_configs) + +/* The EDAC driver private data */ +struct dmc520_edac { + void __iomem *reg_base; + spinlock_t ecc_lock; + int irqs[NUMBER_OF_IRQS]; + int masks[NUMBER_OF_IRQS]; +}; + +static int dmc520_mc_idx; + +static irqreturn_t +dmc520_edac_dram_all_isr(int irq, struct mem_ctl_info *mci, u32 irq_mask); + +static irqreturn_t dmc520_isr(int irq, void *data) +{ + struct mem_ctl_info *mci; + struct dmc520_edac *edac; + int idx; + u32 mask = 0; + mci = data; + edac = mci->pvt_info; + + for (idx = 0; idx < NUMBER_OF_IRQS; idx++) { + if (edac->irqs[idx] == irq) { + mask = edac->masks[idx]; + break; + } + } + return dmc520_edac_dram_all_isr(irq, mci, mask); +} + +static u32 dmc520_read_reg(struct dmc520_edac *edac, u32 offset) +{ + return readl(edac->reg_base + offset); +} + +static void dmc520_write_reg(struct dmc520_edac *edac, u32 val, u32 offset) +{ + writel(val, edac->reg_base + offset); +} + +static u32 dmc520_calc_dram_ecc_error(u32 value) +{ + u32 total = 0; + + /* Each rank's error counter takes one byte. */ + while (value > 0) { + total += (value & 0xFF); + value >>= 8; + } + return total; +} + +static u32 dmc520_get_dram_ecc_error_count(struct dmc520_edac *edac, + bool is_ce) +{ + u32 reg_offset_low, reg_offset_high; + u32 err_low, err_high; + u32 err_count; + + reg_offset_low = is_ce ? REG_OFFSET_ECC_ERRC_COUNT_31_00 : + REG_OFFSET_ECC_ERRD_COUNT_31_00; + reg_offset_high = is_ce ? REG_OFFSET_ECC_ERRC_COUNT_63_32 : + REG_OFFSET_ECC_ERRD_COUNT_63_32; + + err_low = dmc520_read_reg(edac, reg_offset_low); + err_high = dmc520_read_reg(edac, reg_offset_high); + /* Reset error counters */ + dmc520_write_reg(edac, 0, reg_offset_low); + dmc520_write_reg(edac, 0, reg_offset_high); + + err_count = dmc520_calc_dram_ecc_error(err_low) + + dmc520_calc_dram_ecc_error(err_high); + + return err_count; +} + +static void dmc520_get_dram_ecc_error_info(struct dmc520_edac *edac, + bool is_ce, + struct ecc_error_info *info) +{ + u32 reg_offset_low, reg_offset_high; + u32 reg_val_low, reg_val_high; + bool valid; + + reg_offset_low = is_ce ? REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_31_00 : + REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_31_00; + reg_offset_high = is_ce ? REG_OFFSET_DRAM_ECC_ERRC_INT_INFO_63_32 : + REG_OFFSET_DRAM_ECC_ERRD_INT_INFO_63_32; + + reg_val_low = dmc520_read_reg(edac, reg_offset_low); + reg_val_high = dmc520_read_reg(edac, reg_offset_high); + + valid = (FIELD_GET(REG_FIELD_ERR_INFO_LOW_VALID, reg_val_low) != 0) && + (FIELD_GET(REG_FIELD_ERR_INFO_HIGH_VALID, reg_val_high) != 0); + + if (valid) { + info->col = + FIELD_GET(REG_FIELD_ERR_INFO_LOW_COL, reg_val_low); + info->row = + FIELD_GET(REG_FIELD_ERR_INFO_LOW_ROW, reg_val_low); + info->rank = + FIELD_GET(REG_FIELD_ERR_INFO_LOW_RANK, reg_val_low); + info->bank = + FIELD_GET(REG_FIELD_ERR_INFO_HIGH_BANK, reg_val_high); + } else { + memset(info, 0, sizeof(struct ecc_error_info)); + } +} + +static bool dmc520_is_ecc_enabled(void __iomem *reg_base) +{ + u32 reg_val = readl(reg_base + REG_OFFSET_FEATURE_CONFIG); + + return FIELD_GET(REG_FIELD_DRAM_ECC_ENABLED, reg_val); +} + +static enum scrub_type dmc520_get_scrub_type(struct dmc520_edac *edac) +{ + enum scrub_type type = SCRUB_NONE; + u32 reg_val, scrub_cfg; + + reg_val = dmc520_read_reg(edac, REG_OFFSET_SCRUB_CONTROL0_NOW); + scrub_cfg = FIELD_GET(SCRUB_TRIGGER0_NEXT_MASK, reg_val); + + if (scrub_cfg == DMC520_SCRUB_TRIGGER_ERR_DETECT || + scrub_cfg == DMC520_SCRUB_TRIGGER_IDLE) + type = SCRUB_HW_PROG; + + return type; +} + +/* Get the memory data bus width, in number of bytes. */ +static u32 dmc520_get_memory_width(struct dmc520_edac *edac) +{ + enum dmc520_mem_width mem_width_field; + static u32 mem_width_in_bytes; + u32 reg_val; + + if (mem_width_in_bytes) + return mem_width_in_bytes; + + reg_val = dmc520_read_reg(edac, REG_OFFSET_FORMAT_CONTROL); + mem_width_field = FIELD_GET(MEMORY_WIDTH_MASK, reg_val); + + if (mem_width_field == MEM_WIDTH_X32) + mem_width_in_bytes = 4; + else if (mem_width_field == MEM_WIDTH_X64) + mem_width_in_bytes = 8; + return mem_width_in_bytes; +} + +static enum mem_type dmc520_get_mtype(struct dmc520_edac *edac) +{ + enum mem_type mt = MEM_UNKNOWN; + enum dmc520_mem_type type; + u32 reg_val; + + reg_val = dmc520_read_reg(edac, REG_OFFSET_MEMORY_TYPE_NOW); + type = FIELD_GET(REG_FIELD_MEMORY_TYPE, reg_val); + + switch (type) { + case MEM_TYPE_DDR3: + mt = MEM_DDR3; + break; + + case MEM_TYPE_DDR4: + mt = MEM_DDR4; + break; + } + + return mt; +} + +static enum dev_type dmc520_get_dtype(struct dmc520_edac *edac) +{ + enum dmc520_dev_width device_width; + enum dev_type dt = DEV_UNKNOWN; + u32 reg_val; + + reg_val = dmc520_read_reg(edac, REG_OFFSET_MEMORY_TYPE_NOW); + device_width = FIELD_GET(REG_FIELD_DEVICE_WIDTH, reg_val); + + switch (device_width) { + case DEV_WIDTH_X4: + dt = DEV_X4; + break; + + case DEV_WIDTH_X8: + dt = DEV_X8; + break; + + case DEV_WIDTH_X16: + dt = DEV_X16; + break; + } + + return dt; +} + +static u32 dmc520_get_rank_count(void __iomem *reg_base) +{ + u32 reg_val, rank_bits; + + reg_val = readl(reg_base + REG_OFFSET_ADDRESS_CONTROL_NOW); + rank_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_RANK, reg_val); + + return BIT(rank_bits); +} + +static u64 dmc520_get_rank_size(struct dmc520_edac *edac) +{ + u32 reg_val, col_bits, row_bits, bank_bits; + + reg_val = dmc520_read_reg(edac, REG_OFFSET_ADDRESS_CONTROL_NOW); + + col_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_COL, reg_val) + + DRAM_ADDRESS_CONTROL_MIN_COL_BITS; + row_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_ROW, reg_val) + + DRAM_ADDRESS_CONTROL_MIN_ROW_BITS; + bank_bits = FIELD_GET(REG_FIELD_ADDRESS_CONTROL_BANK, reg_val); + + return (u64)dmc520_get_memory_width(edac) << + (col_bits + row_bits + bank_bits); +} + +static void dmc520_handle_dram_ecc_errors(struct mem_ctl_info *mci, + bool is_ce) +{ + char message[DMC520_MSG_BUF_SIZE]; + struct ecc_error_info info; + struct dmc520_edac *edac; + u32 cnt; + + edac = mci->pvt_info; + dmc520_get_dram_ecc_error_info(edac, is_ce, &info); + + cnt = dmc520_get_dram_ecc_error_count(edac, is_ce); + if (!cnt) + return; + + snprintf(message, ARRAY_SIZE(message), + "rank:%d bank:%d row:%d col:%d", + info.rank, info.bank, + info.row, info.col); + + spin_lock(&edac->ecc_lock); + edac_mc_handle_error((is_ce ? HW_EVENT_ERR_CORRECTED : + HW_EVENT_ERR_UNCORRECTED), + mci, cnt, 0, 0, 0, info.rank, -1, -1, + message, ""); + spin_unlock(&edac->ecc_lock); +} + +static irqreturn_t dmc520_edac_dram_ecc_isr(int irq, struct mem_ctl_info *mci, + bool is_ce) +{ + struct dmc520_edac *edac; + u32 i_mask; + + edac = mci->pvt_info; + + i_mask = is_ce ? DRAM_ECC_INT_CE_BIT : DRAM_ECC_INT_UE_BIT; + + dmc520_handle_dram_ecc_errors(mci, is_ce); + + dmc520_write_reg(edac, i_mask, REG_OFFSET_INTERRUPT_CLR); + + return IRQ_HANDLED; +} + +static irqreturn_t dmc520_edac_dram_all_isr(int irq, struct mem_ctl_info *mci, + u32 irq_mask) +{ + irqreturn_t irq_ret = IRQ_NONE; + struct dmc520_edac *edac; + u32 status; + + edac = mci->pvt_info; + + status = dmc520_read_reg(edac, REG_OFFSET_INTERRUPT_STATUS); + + if ((irq_mask & DRAM_ECC_INT_CE_BIT) && + (status & DRAM_ECC_INT_CE_BIT)) + irq_ret = dmc520_edac_dram_ecc_isr(irq, mci, true); + + if ((irq_mask & DRAM_ECC_INT_UE_BIT) && + (status & DRAM_ECC_INT_UE_BIT)) + irq_ret = dmc520_edac_dram_ecc_isr(irq, mci, false); + + return irq_ret; +} + +static void dmc520_init_csrow(struct mem_ctl_info *mci) +{ + struct dmc520_edac *edac = mci->pvt_info; + struct csrow_info *csi; + struct dimm_info *dimm; + u32 pages_per_rank; + enum dev_type dt; + enum mem_type mt; + int row, ch; + u64 rs; + + dt = dmc520_get_dtype(edac); + mt = dmc520_get_mtype(edac); + rs = dmc520_get_rank_size(edac); + pages_per_rank = rs >> PAGE_SHIFT; + + for (row = 0; row < mci->nr_csrows; row++) { + csi = mci->csrows[row]; + + for (ch = 0; ch < csi->nr_channels; ch++) { + dimm = csi->channels[ch]->dimm; + dimm->grain = dmc520_get_memory_width(edac); + dimm->dtype = dt; + dimm->mtype = mt; + dimm->edac_mode = EDAC_FLAG_SECDED; + dimm->nr_pages = pages_per_rank / csi->nr_channels; + } + } +} + +static int dmc520_edac_probe(struct platform_device *pdev) +{ + bool registered[NUMBER_OF_IRQS] = {false}; + int irqs[NUMBER_OF_IRQS] = {-ENXIO}; + int masks[NUMBER_OF_IRQS] = {0}; + struct mem_ctl_info *mci = NULL; + struct edac_mc_layer layers[1]; + struct dmc520_edac *edac; + void __iomem *reg_base; + u32 irq_mask_all = 0; + int ret, idx, irq; + struct resource *res; + struct device *dev; + u32 reg_val; + + /* Parse the device node */ + dev = &pdev->dev; + + for (idx = 0; idx < NUMBER_OF_IRQS; idx++) { + irq = platform_get_irq_byname(pdev, dmc520_irq_configs[idx].name); + irqs[idx] = irq; + masks[idx] = dmc520_irq_configs[idx].mask; + if (irq >= 0) { + irq_mask_all |= dmc520_irq_configs[idx].mask; + edac_printk(KERN_INFO, EDAC_MOD_NAME, + "Discovered %s, irq: %d.\n", dmc520_irq_configs[idx].name, irq); + } + } + + if (irq_mask_all == 0) { + edac_printk(KERN_ERR, EDAC_MOD_NAME, + "At least one valid interrupt line is expected.\n"); + return -EINVAL; + } + + /* Initialize dmc520 edac */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + reg_base = devm_ioremap_resource(dev, res); + if (IS_ERR(reg_base)) + return PTR_ERR(reg_base); + + if (!dmc520_is_ecc_enabled(reg_base)) + return -ENXIO; + + layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; + layers[0].size = dmc520_get_rank_count(reg_base); + layers[0].is_virt_csrow = true; + + mci = edac_mc_alloc(dmc520_mc_idx++, ARRAY_SIZE(layers), layers, + sizeof(struct dmc520_edac)); + if (!mci) { + edac_printk(KERN_ERR, EDAC_MOD_NAME, + "Failed to allocate memory for mc instance\n"); + ret = -ENOMEM; + goto err; + } + + edac = mci->pvt_info; + + edac->reg_base = reg_base; + spin_lock_init(&edac->ecc_lock); + memcpy(edac->irqs, irqs, sizeof(irqs)); + memcpy(edac->masks, masks, sizeof(masks)); + + platform_set_drvdata(pdev, mci); + + mci->pdev = dev; + mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR4; + mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; + mci->edac_cap = EDAC_FLAG_SECDED; + mci->scrub_cap = SCRUB_FLAG_HW_SRC; + mci->scrub_mode = dmc520_get_scrub_type(edac); + mci->ctl_name = EDAC_CTL_NAME; + mci->dev_name = dev_name(mci->pdev); + mci->mod_name = EDAC_MOD_NAME; + + edac_op_state = EDAC_OPSTATE_INT; + + dmc520_init_csrow(mci); + + /* Clear interrupts, not affecting other unrelated interrupts */ + reg_val = dmc520_read_reg(edac, REG_OFFSET_INTERRUPT_CONTROL); + dmc520_write_reg(edac, reg_val & (~irq_mask_all), + REG_OFFSET_INTERRUPT_CONTROL); + dmc520_write_reg(edac, irq_mask_all, REG_OFFSET_INTERRUPT_CLR); + + for (idx = 0; idx < NUMBER_OF_IRQS; idx++) { + irq = irqs[idx]; + if (irq >= 0) { + ret = devm_request_irq(&pdev->dev, irq, + dmc520_isr, IRQF_SHARED, + dev_name(&pdev->dev), mci); + if (ret < 0) { + edac_printk(KERN_ERR, EDAC_MC, + "Failed to request irq %d\n", irq); + goto err; + } + registered[idx] = true; + } + } + + /* Reset DRAM CE/UE counters */ + if (irq_mask_all & DRAM_ECC_INT_CE_BIT) + dmc520_get_dram_ecc_error_count(edac, true); + + if (irq_mask_all & DRAM_ECC_INT_UE_BIT) + dmc520_get_dram_ecc_error_count(edac, false); + + ret = edac_mc_add_mc(mci); + if (ret) { + edac_printk(KERN_ERR, EDAC_MOD_NAME, + "Failed to register with EDAC core\n"); + goto err; + } + + /* Enable interrupts, not affecting other unrelated interrupts */ + dmc520_write_reg(edac, reg_val | irq_mask_all, + REG_OFFSET_INTERRUPT_CONTROL); + + return 0; + +err: + for (idx = 0; idx < NUMBER_OF_IRQS; idx++) { + if (registered[idx]) { + devm_free_irq(&pdev->dev, edac->irqs[idx], mci); + } + } + if (mci) + edac_mc_free(mci); + + return ret; +} + +static int dmc520_edac_remove(struct platform_device *pdev) +{ + struct dmc520_edac *edac; + struct mem_ctl_info *mci; + u32 reg_val, idx, irq_mask_all = 0; + + mci = platform_get_drvdata(pdev); + edac = mci->pvt_info; + + /* free irq's */ + for (idx = 0; idx < NUMBER_OF_IRQS; idx++) { + if (edac->irqs[idx] >= 0) { + irq_mask_all |= edac->masks[idx]; + devm_free_irq(&pdev->dev, edac->irqs[idx], mci); + } + } + + /* Disable interrupts */ + reg_val = dmc520_read_reg(edac, REG_OFFSET_INTERRUPT_CONTROL); + dmc520_write_reg(edac, reg_val & (~irq_mask_all), + REG_OFFSET_INTERRUPT_CONTROL); + + edac_mc_del_mc(&pdev->dev); + edac_mc_free(mci); + + return 0; +} + +static const struct of_device_id dmc520_edac_driver_id[] = { + { .compatible = "arm,dmc-520", }, + { /* end of table */ } +}; + +MODULE_DEVICE_TABLE(of, dmc520_edac_driver_id); + +static struct platform_driver dmc520_edac_driver = { + .driver = { + .name = "dmc520", + .of_match_table = dmc520_edac_driver_id, + }, + + .probe = dmc520_edac_probe, + .remove = dmc520_edac_remove +}; + +module_platform_driver(dmc520_edac_driver); + +MODULE_AUTHOR("Rui Zhao "); +MODULE_AUTHOR("Lei Wang "); +MODULE_AUTHOR("Shiping Ji "); +MODULE_DESCRIPTION("DMC-520 ECC driver"); +MODULE_LICENSE("GPL v2");