@@ -539,4 +539,14 @@ config EDAC_DMC520
Support for error detection and correction on the
SoCs with ARM DMC-520 DRAM controller.
+config EDAC_NPCM
+ tristate "Nuvoton NPCM DDR Memory Controller"
+ depends on (ARCH_NPCM || COMPILE_TEST)
+ help
+ Support for error detection and correction on the Nuvoton NPCM DDR
+ memory controller.
+
+ First, ECC must be configured in the BootBlock header. Then, this driver
+ will expose error counters via the EDAC kernel framework.
+
endif # EDAC
@@ -84,3 +84,4 @@ 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
+obj-$(CONFIG_EDAC_NPCM) += npcm_edac.o
new file mode 100644
@@ -0,0 +1,680 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2022 Nuvoton Technology corporation.
+
+#include <linux/delay.h>
+#include <linux/of_device.h>
+
+#include "edac_module.h"
+
+#define NPCM_EDAC_MOD_NAME "npcm-edac"
+#define FORCED_ECC_ERR_EVENT_SUPPORT BIT(1)
+#define EDAC_MSG_SIZE 256
+/* Granularity of reported error in bytes */
+#define NPCM_EDAC_ERR_GRAIN 1
+
+#define MEM_TYPE_DDR4 0xA
+
+#define NPCM7XX_CHIP 0x700
+#define NPCM8XX_CHIP 0x800
+
+/* Control register width definitions */
+#define WDTH_16 (2)
+#define WDTH_32 (1)
+#define WDTH_64 (0)
+#define CTL_MEM_MAX_WIDTH_MASK GENMASK(4, 0)
+#define CTL_REG_WIDTH_SHIFT (32)
+#define XOR_CHECK_BIT_SPLIT_WIDTH (16)
+#define CTL_CONTROLLER_BUSY_FLAG BIT(0)
+#define NPCM_ECC_CTL_FORCE_WC BIT(8)
+#define NPCM_ECC_CTL_AUTO_WRITEBACK_EN BIT(24)
+#define NPCM_ECC_CTL_XOR_BITS_MASK GENMASK(23, 16)
+#define NPCM_ECC_CTL_MTYPE_MASK GENMASK(11, 8)
+#define NPCM_ECC_CTL_GLOBAL_INT_DISABLE BIT(31)
+
+/* Syndrome values */
+#define ECC_DOUBLE_MULTI_ERR_SYND 0x03
+
+static char data_synd[] = {
+ 0xf4, 0xf1, 0xec, 0xea, 0xe9, 0xe6, 0xe5, 0xe3,
+ 0xdc, 0xda, 0xd9, 0xd6, 0xd5, 0xd3, 0xce, 0xcb,
+ 0xb5, 0xb0, 0xad, 0xab, 0xa8, 0xa7, 0xa4, 0xa2,
+ 0x9d, 0x9b, 0x98, 0x97, 0x94, 0x92, 0x8f, 0x8a,
+ 0x75, 0x70, 0x6d, 0x6b, 0x68, 0x67, 0x64, 0x62,
+ 0x5e, 0x5b, 0x58, 0x57, 0x54, 0x52, 0x4f, 0x4a,
+ 0x34, 0x31, 0x2c, 0x2a, 0x29, 0x26, 0x25, 0x23,
+ 0x1c, 0x1a, 0x19, 0x16, 0x15, 0x13, 0x0e, 0x0b
+ };
+
+static char check_synd[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
+
+struct npcm_edac_platform_data {
+ /* force ECC event */
+ u32 ip_features;
+ u32 ddr_ctl_controller_busy_reg;
+ u32 ecc_ctl_xor_check_bits_reg;
+
+ u32 chip;
+
+ /* DDR4 Controller Registers */
+ u32 ddr_ctl_mem_type_reg;
+ u32 ddr_ctl_mem_width_reg;
+
+ u32 ecc_ctl_en_reg;
+ u32 ecc_ctl_int_mask;
+ u32 ecc_ctl_int_status;
+ u32 ecc_ctl_int_ack;
+ u32 ecc_ctl_int_mask_master;
+ u32 ecc_ctl_int_mask_ecc;
+
+ u32 ecc_sig_c_addr_l;
+ u32 ecc_sig_c_addr_h;
+ u32 ecc_sig_c_data_l;
+ u32 ecc_sig_c_data_h;
+ u32 ecc_sig_c_id;
+ u32 ecc_sig_c_synd;
+
+ u32 ecc_sig_u_addr_l;
+ u32 ecc_sig_u_addr_h;
+ u32 ecc_sig_u_data_l;
+ u32 ecc_sig_u_data_h;
+ u32 ecc_sig_u_id;
+ u32 ecc_sig_u_synd;
+
+ /* MASK */
+ u32 ecc_ctl_ecc_enable_mask;
+ u32 ecc_ctl_en_int_master_mask;
+ u32 ecc_ctl_en_int_ecc_mask;
+
+ /* ECC IRQ Macros */
+ u32 ecc_int_ce_event;
+ u32 ecc_int_second_ce_event;
+ u32 ecc_int_ue_event;
+ u32 ecc_int_second_ue_event;
+ u32 ecc_int_ce_ue_mask;
+ u32 ecc_ce_intr_mask;
+ u32 ecc_ue_intr_mask;
+
+ /* ECC Signature Macros */
+ u32 ecc_sig_c_id_shift;
+ u32 ecc_sig_c_synd_shift;
+ u32 ecc_sig_c_addr_h_mask;
+ u32 ecc_sig_c_id_mask;
+ u32 ecc_sig_c_synd_mask;
+
+ u32 ecc_sig_u_id_shift;
+ u32 ecc_sig_u_synd_shift;
+ u32 ecc_sig_u_addr_h_mask;
+ u32 ecc_sig_u_id_mask;
+ u32 ecc_sig_u_synd_mask;
+};
+
+struct priv_data {
+ void __iomem *reg;
+ u32 ce_cnt;
+ u32 ue_cnt;
+ char message[EDAC_MSG_SIZE];
+ const struct npcm_edac_platform_data *npcm_chip;
+};
+
+
+static void init_mem_layout(struct mem_ctl_info *mci)
+{
+ struct priv_data *priv = mci->pvt_info;
+ const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+ struct csrow_info *csi;
+ struct dimm_info *dimm;
+ struct sysinfo info;
+ enum mem_type mtype;
+ u32 val, width;
+ u32 size, row;
+ u8 j;
+
+ dimm = edac_get_dimm(mci, 0, 0, 0);
+
+ if (dimm)
+ return;
+
+ si_meminfo(&info);
+ size = info.totalram * info.mem_unit;
+ for (row = 0; row < mci->nr_csrows; row++) {
+ csi = mci->csrows[row];
+
+ for (j = 0; j < csi->nr_channels; j++) {
+ dimm = csi->channels[j]->dimm;
+ dimm->edac_mode = EDAC_FLAG_SECDED;
+ /* Get memory type by reading hw registers */
+ val = readl(priv->reg + npcm_chip->ddr_ctl_mem_type_reg);
+
+ mtype = val & NPCM_ECC_CTL_MTYPE_MASK;
+ if (mtype == MEM_TYPE_DDR4)
+ dimm->mtype = MEM_DDR4;
+ else
+ dimm->mtype = MEM_EMPTY;
+
+ /* Get EDAC devtype width for the current mc */
+ width = readl(priv->reg + npcm_chip->ddr_ctl_mem_width_reg)
+ & CTL_MEM_MAX_WIDTH_MASK;
+ switch (width) {
+ case WDTH_16:
+ dimm->dtype = DEV_X2;
+ break;
+ case WDTH_32:
+ dimm->dtype = DEV_X4;
+ break;
+ case WDTH_64:
+ dimm->dtype = DEV_X8;
+ break;
+ default:
+ dimm->dtype = DEV_UNKNOWN;
+ }
+
+ dimm->nr_pages = (size >> PAGE_SHIFT) /
+ csi->nr_channels;
+ dimm->grain = NPCM_EDAC_ERR_GRAIN;
+ }
+ }
+}
+
+
+static void handle_correctable_error(struct mem_ctl_info *mci)
+{
+ struct priv_data *priv = mci->pvt_info;
+ const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+ u64 err_c_addr = 0x0;
+ u64 err_c_data = 0x0;
+ u32 err_c_synd, err_c_id;
+ u32 sig_val_l, sig_val_h = 0x0;
+
+ sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_c_addr_l);
+
+ if (npcm_chip->chip == NPCM8XX_CHIP)
+ sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_c_addr_h) &
+ npcm_chip->ecc_sig_c_addr_h_mask);
+
+ err_c_addr = (((err_c_addr | sig_val_h) <<
+ CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+ sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_c_data_l);
+
+ if (npcm_chip->chip == NPCM8XX_CHIP)
+ sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_c_data_h);
+
+ err_c_data = (((err_c_data | sig_val_h) <<
+ CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+ err_c_id = ((readl(priv->reg + npcm_chip->ecc_sig_c_id) &
+ npcm_chip->ecc_sig_c_id_mask) >>
+ npcm_chip->ecc_sig_c_id_shift);
+
+ err_c_synd = ((readl(priv->reg + npcm_chip->ecc_sig_c_synd) &
+ npcm_chip->ecc_sig_c_synd_mask) >>
+ npcm_chip->ecc_sig_c_synd_shift);
+
+ priv->ce_cnt += 1;
+
+ snprintf(priv->message,
+ EDAC_MSG_SIZE, "DDR ECC %s: data=0x%llx source_id=%#08x",
+ mci->ctl_name, err_c_data, err_c_id);
+
+ edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
+ 1,
+ err_c_addr >> PAGE_SHIFT,
+ err_c_addr & ~PAGE_MASK,
+ err_c_synd, 0, 0, -1,
+ priv->message, "");
+}
+
+static void handle_ue(struct mem_ctl_info *mci)
+{
+ struct priv_data *priv = mci->pvt_info;
+ const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+ u64 err_u_addr = 0x0;
+ u64 err_u_data = 0x0;
+ u32 err_u_synd, err_u_id;
+ u32 sig_val_l, sig_val_h = 0x0;
+
+ sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_u_addr_l);
+
+ if (npcm_chip->chip == NPCM8XX_CHIP)
+ sig_val_h = (readl(priv->reg + npcm_chip->ecc_sig_u_addr_h) &
+ npcm_chip->ecc_sig_u_addr_h_mask);
+
+ err_u_addr = (((err_u_addr | sig_val_h) <<
+ CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+ sig_val_l = readl(priv->reg + npcm_chip->ecc_sig_u_data_l);
+
+ if (npcm_chip->chip == NPCM8XX_CHIP)
+ sig_val_h = readl(priv->reg + npcm_chip->ecc_sig_u_data_h);
+
+ err_u_data = (((err_u_data | sig_val_h) <<
+ CTL_REG_WIDTH_SHIFT) | sig_val_l);
+
+ err_u_id = ((readl(priv->reg + npcm_chip->ecc_sig_u_id) &
+ npcm_chip->ecc_sig_u_id_mask) >>
+ npcm_chip->ecc_sig_u_id_shift);
+
+ err_u_synd = ((readl(priv->reg + npcm_chip->ecc_sig_u_synd) &
+ npcm_chip->ecc_sig_u_synd_mask) >>
+ npcm_chip->ecc_sig_u_synd_shift);
+ priv->ue_cnt += 1;
+
+ snprintf(priv->message, EDAC_MSG_SIZE,
+ "DDR ECC %s: addr=0x%llx data=0x%llx source_id=%#08x",
+ mci->ctl_name, err_u_addr, err_u_data, err_u_id);
+
+ edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
+ 1,
+ err_u_addr >> PAGE_SHIFT,
+ err_u_addr & ~PAGE_MASK,
+ err_u_synd, 0, 0, -1,
+ priv->message, "");
+}
+
+static irqreturn_t edac_ecc_isr(int irq, void *dev_id)
+{
+ struct mem_ctl_info *mci = dev_id;
+ struct priv_data *priv = mci->pvt_info;
+ const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+ u32 intr_status;
+ u32 val;
+
+ /* Check the intr status and confirm ECC error intr */
+ intr_status = readl(priv->reg + npcm_chip->ecc_ctl_int_status);
+
+ edac_dbg(3, "dev: %s, id: %s: IRQ: %d, interrupt status: 0x%x\n",
+ mci->dev_name, mci->ctl_name, irq, intr_status);
+
+ val = intr_status & npcm_chip->ecc_int_ce_ue_mask;
+ if (!((val & npcm_chip->ecc_ce_intr_mask) || (val & npcm_chip->ecc_ue_intr_mask)))
+ return IRQ_NONE;
+
+ if (val & npcm_chip->ecc_ce_intr_mask) {
+ handle_correctable_error(mci);
+
+ /* Clear the interrupt source */
+ if (val & npcm_chip->ecc_int_ce_event)
+ writel(npcm_chip->ecc_int_ce_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
+ else if (val & npcm_chip->ecc_int_second_ce_event)
+ writel(npcm_chip->ecc_int_second_ce_event,
+ priv->reg + npcm_chip->ecc_ctl_int_ack);
+ else
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear CE IRQ\n");
+ }
+
+ if (val & npcm_chip->ecc_ue_intr_mask) {
+ handle_ue(mci);
+
+ /* Clear the interrupt source */
+ if (val & npcm_chip->ecc_int_ue_event)
+ writel(npcm_chip->ecc_int_ue_event, priv->reg + npcm_chip->ecc_ctl_int_ack);
+ else if (val & npcm_chip->ecc_int_second_ue_event)
+ writel(npcm_chip->ecc_int_second_ue_event,
+ priv->reg + npcm_chip->ecc_ctl_int_ack);
+ else
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to clear UE IRQ\n");
+ }
+
+ edac_dbg(3, "Total error count CE %d UE %d\n",
+ priv->ce_cnt, priv->ue_cnt);
+
+ return IRQ_HANDLED;
+}
+
+static ssize_t forced_ecc_error_show(struct device *dev,
+ struct device_attribute *mattr,
+ char *data)
+{
+ return sprintf(data, "CDNS-DDR4 Force Injection Help:\n"
+ "Example:\n"
+ "echo \"CE checkcode 0\" > /sys/devices/system/edac/mc/mc0/forced_ecc_error\n"
+ "CE: Corrected\n"
+ "UE: Uncorrected\n"
+ "checkcode/data:source\n"
+ "bit [0-63] for data [0-7] for checkcode:bit number\n");
+}
+
+static ssize_t forced_ecc_error_store(struct device *dev,
+ struct device_attribute *mattr,
+ const char *data, size_t count)
+{
+ struct mem_ctl_info *mci = to_mci(dev);
+ struct priv_data *priv = mci->pvt_info;
+ const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+ int args_cnt;
+ int ret;
+ char **args;
+ u32 regval;
+ u8 bit_no;
+
+ /* Check ecc enabled */
+ if (!(readl(priv->reg + npcm_chip->ecc_ctl_en_reg) & npcm_chip->ecc_ctl_ecc_enable_mask))
+ return count;
+
+ /* Check no write operation pending to controller */
+ while (readl(priv->reg + npcm_chip->ddr_ctl_controller_busy_reg) &
+ CTL_CONTROLLER_BUSY_FLAG) {
+ usleep_range(1000, 10000);
+ }
+
+ /* Split string buffer into separate parameters */
+ args = argv_split(GFP_KERNEL, data, &args_cnt);
+
+ /* Write appropriate syndrome to xor_check_bit */
+ if (!strcmp(args[0], "CE") && args_cnt == 3) {
+ ret = kstrtou8(args[2], 0, &bit_no);
+ if (ret)
+ return ret;
+ if (!strcmp(args[1], "checkcode")) {
+ if (bit_no > 7) {
+ edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for checkcode must be 0~7\n");
+ return count;
+ }
+ regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
+ (check_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
+ writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ } else if (!strcmp(args[1], "data")) {
+ if (bit_no > 63) {
+ edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "bit_no for data must be 0~63\n");
+ return count;
+ }
+ regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
+ (data_synd[bit_no] << XOR_CHECK_BIT_SPLIT_WIDTH);
+ writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ }
+ /* Enable the ECC writeback_en for corrected error */
+ regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ writel((regval | NPCM_ECC_CTL_AUTO_WRITEBACK_EN),
+ priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ } else if (!strcmp(args[0], "UE")) {
+ regval = readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ regval = (regval & ~(NPCM_ECC_CTL_XOR_BITS_MASK)) |
+ (ECC_DOUBLE_MULTI_ERR_SYND << XOR_CHECK_BIT_SPLIT_WIDTH);
+ writel(regval, priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+ }
+
+ /* Assert fwc */
+ writel((NPCM_ECC_CTL_FORCE_WC | readl(priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg)),
+ priv->reg + npcm_chip->ecc_ctl_xor_check_bits_reg);
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(forced_ecc_error);
+static int create_sysfs_attributes(struct mem_ctl_info *mci)
+{
+ int rc;
+
+ rc = device_create_file(&mci->dev, &dev_attr_forced_ecc_error);
+ if (rc < 0)
+ return rc;
+ return 0;
+}
+
+static void remove_sysfs_attributes(struct mem_ctl_info *mci)
+{
+ device_remove_file(&mci->dev, &dev_attr_forced_ecc_error);
+}
+
+static const struct npcm_edac_platform_data npcm7xx_edac = {
+ .chip = NPCM7XX_CHIP,
+
+ /* CDNS DDR4 Controller Registers */
+ .ecc_ctl_en_reg = 0x174,
+ .ecc_ctl_int_status = 0x1D0,
+ .ecc_ctl_int_ack = 0x1D4,
+ .ecc_ctl_int_mask_master = 0x1D8,
+
+ .ecc_sig_c_addr_l = 0x188,
+ .ecc_sig_c_data_l = 0x190,
+ .ecc_sig_c_id = 0x194,
+ .ecc_sig_c_synd = 0x18C,
+
+ .ecc_sig_u_addr_l = 0x17C,
+ .ecc_sig_u_data_l = 0x184,
+ .ecc_sig_u_id = 0x194,
+ .ecc_sig_u_synd = 0x180,
+
+ /* MASK */
+ .ecc_ctl_ecc_enable_mask = BIT(24),
+ .ecc_ctl_en_int_master_mask = GENMASK(30, 7) | GENMASK(2, 0),
+
+ /* ECC IRQ Macros */
+ .ecc_int_ce_event = BIT(3),
+ .ecc_int_second_ce_event = BIT(4),
+ .ecc_int_ue_event = BIT(5),
+ .ecc_int_second_ue_event = BIT(6),
+ .ecc_int_ce_ue_mask = GENMASK(6, 3),
+ .ecc_ce_intr_mask = GENMASK(4, 3),
+ .ecc_ue_intr_mask = GENMASK(6, 5),
+
+ /* ECC Signature Macros */
+ .ecc_sig_c_id_shift = 16,
+ .ecc_sig_c_synd_shift = 0,
+
+ .ecc_sig_c_id_mask = GENMASK(29, 16),
+ .ecc_sig_c_synd_mask = GENMASK(6, 0),
+
+ .ecc_sig_u_id_shift = 0,
+ .ecc_sig_u_synd_shift = 0,
+
+ .ecc_sig_u_id_mask = GENMASK(13, 0),
+ .ecc_sig_u_synd_mask = GENMASK(6, 0),
+};
+
+static const struct npcm_edac_platform_data npcm8xx_edac = {
+ .ip_features = FORCED_ECC_ERR_EVENT_SUPPORT,
+ .ddr_ctl_controller_busy_reg = 0x20C,
+ .ecc_ctl_xor_check_bits_reg = 0x174,
+
+ .chip = NPCM8XX_CHIP,
+
+ /* CDNS DDR4 Controller Registers */
+ .ddr_ctl_mem_type_reg = 0x000,
+ .ddr_ctl_mem_width_reg = 0x00c,
+
+ .ecc_ctl_en_reg = 0x16C,
+ .ecc_ctl_int_status = 0x228,
+ .ecc_ctl_int_ack = 0x244,
+ .ecc_ctl_int_mask_master = 0x220,
+ .ecc_ctl_int_mask_ecc = 0x260,
+
+ .ecc_sig_c_addr_l = 0x18C,
+ .ecc_sig_c_addr_h = 0x190,
+ .ecc_sig_c_data_l = 0x194,
+ .ecc_sig_c_data_h = 0x198,
+ .ecc_sig_c_id = 0x19C,
+ .ecc_sig_c_synd = 0x190,
+
+ .ecc_sig_u_addr_l = 0x17C,
+ .ecc_sig_u_addr_h = 0x180,
+ .ecc_sig_u_data_l = 0x184,
+ .ecc_sig_u_data_h = 0x188,
+ .ecc_sig_u_id = 0x19C,
+ .ecc_sig_u_synd = 0x180,
+
+ /* MASK */
+ .ecc_ctl_ecc_enable_mask = GENMASK(17, 16),
+ .ecc_ctl_en_int_master_mask = GENMASK(30, 3) | GENMASK(1, 0),
+ .ecc_ctl_en_int_ecc_mask = GENMASK(8, 4),
+
+ /* ECC IRQ Macros */
+ .ecc_int_ce_event = BIT(0),
+ .ecc_int_second_ce_event = BIT(1),
+ .ecc_int_ue_event = BIT(2),
+ .ecc_int_second_ue_event = BIT(3),
+ .ecc_int_ce_ue_mask = GENMASK(3, 0),
+ .ecc_ce_intr_mask = GENMASK(1, 0),
+ .ecc_ue_intr_mask = GENMASK(3, 2),
+
+ /* ECC Signature Macros */
+ .ecc_sig_c_id_shift = 8,
+ .ecc_sig_c_synd_shift = 8,
+ .ecc_sig_c_addr_h_mask = GENMASK(1, 0),
+ .ecc_sig_c_id_mask = GENMASK(29, 16),
+ .ecc_sig_c_synd_mask = GENMASK(15, 8),
+
+ .ecc_sig_u_id_shift = 0,
+ .ecc_sig_u_synd_shift = 8,
+ .ecc_sig_u_addr_h_mask = GENMASK(1, 0),
+ .ecc_sig_u_id_mask = GENMASK(13, 0),
+ .ecc_sig_u_synd_mask = GENMASK(15, 8),
+};
+
+static const struct of_device_id npcm_edac_of_match[] = {
+ { .compatible = "nuvoton,npcm750-memory-controller", .data = &npcm7xx_edac },
+ { .compatible = "nuvoton,npcm845-memory-controller", .data = &npcm8xx_edac },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, npcm_edac_of_match);
+
+static int npcm_edac_mc_probe(struct platform_device *pdev)
+{
+ const struct npcm_edac_platform_data *npcm_chip;
+ struct device *dev = &pdev->dev;
+ struct edac_mc_layer layers[1];
+ const struct of_device_id *id;
+ struct priv_data *priv_data;
+ struct mem_ctl_info *mci;
+ struct resource *res;
+ void __iomem *reg;
+ int ret = -ENODEV;
+ int irq;
+ u32 ecc_en;
+
+ id = of_match_device(npcm_edac_of_match, &pdev->dev);
+
+ npcm_chip = of_device_get_match_data(&pdev->dev);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ reg = devm_ioremap_resource(dev, res);
+ if (IS_ERR(reg)) {
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "cdns DDR4 mc regs are not defined\n");
+ return PTR_ERR(reg);
+ }
+
+ ecc_en = readl(reg + npcm_chip->ecc_ctl_en_reg);
+
+ if ((ecc_en & npcm_chip->ecc_ctl_ecc_enable_mask) == npcm_chip->ecc_ctl_ecc_enable_mask) {
+ edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC reporting and correcting on. ");
+ } else {
+ edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "ECC disabled\n");
+ return -ENXIO;
+ }
+
+ edac_printk(KERN_INFO, NPCM_EDAC_MOD_NAME, "IO mapped reg addr: %p\n", reg);
+
+ layers[0].type = EDAC_MC_LAYER_ALL_MEM;
+ layers[0].size = 1;
+
+ mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
+ sizeof(struct priv_data));
+ if (!mci) {
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed memory allocation for mc instance\n");
+ return -ENOMEM;
+ }
+ mci->pdev = &pdev->dev;
+ priv_data = mci->pvt_info;
+ priv_data->reg = reg;
+ priv_data->npcm_chip = npcm_chip;
+ priv_data->ce_cnt = 0;
+ priv_data->ue_cnt = 0;
+ platform_set_drvdata(pdev, mci);
+
+ /* Initialize controller capabilities */
+ mci->mtype_cap = MEM_FLAG_DDR4;
+ mci->edac_ctl_cap = EDAC_FLAG_SECDED;
+ mci->scrub_cap = SCRUB_FLAG_HW_SRC;
+ mci->scrub_mode = SCRUB_HW_SRC;
+ mci->edac_cap = EDAC_FLAG_SECDED;
+ mci->ctl_name = id->compatible;
+ mci->dev_name = dev_name(&pdev->dev);
+ mci->mod_name = NPCM_EDAC_MOD_NAME;
+ mci->ctl_page_to_phys = NULL;
+
+ /* Interrupt feature is supported by cadence mc */
+ edac_op_state = EDAC_OPSTATE_INT;
+ if (IS_ENABLED(CONFIG_EDAC_DEBUG))
+ init_mem_layout(mci);
+
+ /* Set up Interrupt handler for ECC */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "irq number not defined for ECC.\n");
+ goto err;
+ }
+ ret = devm_request_irq(dev, irq, edac_ecc_isr, 0, "cdns-edac-mc-ecc-irq", mci);
+ if (ret) {
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "request_irq fail for NPCM_EDAC irq\n");
+ goto err;
+ }
+ ret = edac_mc_add_mc(mci);
+ if (ret) {
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to register with EDAC core\n");
+ goto err;
+ }
+
+ if (IS_ENABLED(CONFIG_EDAC_DEBUG) &&
+ (npcm_chip->ip_features & FORCED_ECC_ERR_EVENT_SUPPORT) &&
+ npcm_chip->chip == NPCM8XX_CHIP) {
+ if (create_sysfs_attributes(mci))
+ edac_printk(KERN_ERR, NPCM_EDAC_MOD_NAME, "Failed to create sysfs entries\n");
+ }
+
+ /* Only enable MC interrupts with ECC - clear global int mask bit and ecc bit */
+ writel(npcm_chip->ecc_ctl_en_int_master_mask,
+ priv_data->reg + npcm_chip->ecc_ctl_int_mask_master);
+
+ if (npcm_chip->chip == NPCM8XX_CHIP) {
+ /* clear single and multi for ce and ue */
+ writel(npcm_chip->ecc_ctl_en_int_ecc_mask,
+ priv_data->reg + npcm_chip->ecc_ctl_int_mask_ecc);
+ }
+
+ return 0;
+
+ edac_mc_del_mc(&pdev->dev);
+
+err:
+ edac_mc_free(mci);
+ return ret;
+}
+
+static int npcm_edac_mc_remove(struct platform_device *pdev)
+{
+ struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+ struct priv_data *priv = mci->pvt_info;
+ const struct npcm_edac_platform_data *npcm_chip = priv->npcm_chip;
+
+ writel(NPCM_ECC_CTL_GLOBAL_INT_DISABLE, priv->reg + npcm_chip->ecc_ctl_int_mask_master);
+
+ /* Disable ecc feature before removing driver by writing 0 */
+ writel((unsigned int)(~(npcm_chip->ecc_ctl_ecc_enable_mask)),
+ priv->reg + npcm_chip->ecc_ctl_en_reg);
+
+ if (IS_ENABLED(CONFIG_EDAC_DEBUG))
+ remove_sysfs_attributes(mci);
+
+ edac_mc_del_mc(&pdev->dev);
+ edac_mc_free(mci);
+
+ return 0;
+}
+
+static struct platform_driver npcm_edac_mc_driver = {
+ .driver = {
+ .name = "npcm-edac",
+ .of_match_table = npcm_edac_of_match,
+ },
+ .probe = npcm_edac_mc_probe,
+ .remove = npcm_edac_mc_remove,
+};
+
+module_platform_driver(npcm_edac_mc_driver);
+
+MODULE_AUTHOR("Medad CChien <ctcchien@nuvoton.com>");
+MODULE_DESCRIPTION("Nuvoton NPCM EDAC Driver");
+MODULE_LICENSE("GPL v2");
Add memory controller support for Nuvoton NPCM SoC. Note: you can force an ecc event by writing a string to edac sysfs node and remember to define CONFIG_EDAC_DEBUG to enable this feature example: force a correctable event on checkcode bit 0 echo "CE checkcode 0" > /sys/devices/system/edac/mc/mc0/forced_ecc_error Fix the following warnings and error: error: error: macro "edac_printk" requires 4 arguments, but only 2 given in driver/edac/npcm_edac.c edac_printk(KERN_INFO, "bit_no for checkcode must be 0~7\n"); warnings: performing pointer arithmetic on a null pointer has undefined behavior. logical not is only applied to the left hand side of this bitwise operator. mixing declarations and code is a C99 extension. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Medad CChien <ctcchien@nuvoton.com> --- drivers/edac/Kconfig | 10 + drivers/edac/Makefile | 1 + drivers/edac/npcm_edac.c | 680 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 691 insertions(+) create mode 100644 drivers/edac/npcm_edac.c