EDAC, synopsys: Add ECC support for ZynqMP DDR controller

Add ECC support for ZynqMP DDR controller IP. The IP supports interrupts
for corrected and uncorrected errors. Add interrupt handlers for the
same.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
CC: Mauro Carvalho Chehab <mchehab@kernel.org>
CC: Michal Simek <michal.simek@xilinx.com>
CC: amit.kucheria@linaro.org
CC: devicetree@vger.kernel.org
CC: leoyang.li@nxp.com
CC: linux-arm-kernel@lists.infradead.org
CC: linux-edac <linux-edac@vger.kernel.org>
CC: mark.rutland@arm.com
CC: robh+dt@kernel.org
CC: sudeep.holla@arm.com
Link: http://lkml.kernel.org/r/1540447621-22870-5-git-send-email-manish.narani@xilinx.com

2 files changed, 306 insertions, 18 deletions

diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 41c9ccdd20d6..ec2727b27556 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -442,7 +442,7 @@ config EDAC_ALTERA_SDMMC
 
 config EDAC_SYNOPSYS
 	tristate "Synopsys DDR Memory Controller"
-	depends on ARCH_ZYNQ
+	depends on ARCH_ZYNQ || ARCH_ZYNQMP
 	help
 	  Support for error detection and correction on the Synopsys DDR
 	  memory controller.
diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
index d1999e03f118..e81f18aa9576 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -22,6 +22,7 @@
 #include <linux/edac.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/interrupt.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 
@@ -272,6 +273,8 @@
  * @bank:	Bank number.
  * @bitpos:	Bit position.
  * @data:	Data causing the error.
+ * @bankgrpnr:	Bank group number.
+ * @blknr:	Block number.
  */
 struct ecc_error_info {
 	u32 row;
@@ -279,6 +282,8 @@ struct ecc_error_info {
 	u32 bank;
 	u32 bitpos;
 	u32 data;
+	u32 bankgrpnr;
+	u32 blknr;
 };
 
 /**
@@ -385,6 +390,66 @@ out:
 }
 
 /**
+ * zynqmp_get_error_info - Get the current ECC error info.
+ * @priv:	DDR memory controller private instance data.
+ *
+ * Return: one if there is no error otherwise returns zero.
+ */
+static int zynqmp_get_error_info(struct synps_edac_priv *priv)
+{
+	struct synps_ecc_status *p;
+	u32 regval, clearval = 0;
+	void __iomem *base;
+
+	base = priv->baseaddr;
+	p = &priv->stat;
+
+	regval = readl(base + ECC_STAT_OFST);
+	if (!regval)
+		return 1;
+
+	p->ce_cnt = (regval & ECC_STAT_CECNT_MASK) >> ECC_STAT_CECNT_SHIFT;
+	p->ue_cnt = (regval & ECC_STAT_UECNT_MASK) >> ECC_STAT_UECNT_SHIFT;
+	if (!p->ce_cnt)
+		goto ue_err;
+
+	p->ceinfo.bitpos = (regval & ECC_STAT_BITNUM_MASK);
+
+	regval = readl(base + ECC_CEADDR0_OFST);
+	p->ceinfo.row = (regval & ECC_CEADDR0_RW_MASK);
+	regval = readl(base + ECC_CEADDR1_OFST);
+	p->ceinfo.bank = (regval & ECC_CEADDR1_BNKNR_MASK) >>
+					ECC_CEADDR1_BNKNR_SHIFT;
+	p->ceinfo.bankgrpnr = (regval &	ECC_CEADDR1_BNKGRP_MASK) >>
+					ECC_CEADDR1_BNKGRP_SHIFT;
+	p->ceinfo.blknr = (regval & ECC_CEADDR1_BLKNR_MASK);
+	p->ceinfo.data = readl(base + ECC_CSYND0_OFST);
+	edac_dbg(2, "ECCCSYN0: 0x%08X ECCCSYN1: 0x%08X ECCCSYN2: 0x%08X\n",
+		 readl(base + ECC_CSYND0_OFST), readl(base + ECC_CSYND1_OFST),
+		 readl(base + ECC_CSYND2_OFST));
+ue_err:
+	if (!p->ue_cnt)
+		goto out;
+
+	regval = readl(base + ECC_UEADDR0_OFST);
+	p->ueinfo.row = (regval & ECC_CEADDR0_RW_MASK);
+	regval = readl(base + ECC_UEADDR1_OFST);
+	p->ueinfo.bankgrpnr = (regval & ECC_CEADDR1_BNKGRP_MASK) >>
+					ECC_CEADDR1_BNKGRP_SHIFT;
+	p->ueinfo.bank = (regval & ECC_CEADDR1_BNKNR_MASK) >>
+					ECC_CEADDR1_BNKNR_SHIFT;
+	p->ueinfo.blknr = (regval & ECC_CEADDR1_BLKNR_MASK);
+	p->ueinfo.data = readl(base + ECC_UESYND0_OFST);
+out:
+	clearval = ECC_CTRL_CLR_CE_ERR | ECC_CTRL_CLR_CE_ERRCNT;
+	clearval |= ECC_CTRL_CLR_UE_ERR | ECC_CTRL_CLR_UE_ERRCNT;
+	writel(clearval, base + ECC_CLR_OFST);
+	writel(0x0, base + ECC_CLR_OFST);
+
+	return 0;
+}
+
+/**
  * handle_error - Handle Correctable and Uncorrectable errors.
  * @mci:	EDAC memory controller instance.
  * @p:		Synopsys ECC status structure.
@@ -398,9 +463,25 @@ static void handle_error(struct mem_ctl_info *mci, struct synps_ecc_status *p)
 
 	if (p->ce_cnt) {
 		pinf = &p->ceinfo;
-		snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
-			 "DDR ECC error type :%s Row %d Bank %d Col %d ",
-			 "CE", pinf->row, pinf->bank, pinf->col);
+		if (!priv->p_data->quirks) {
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "DDR ECC error type:%s Row %d Bank %d Col %d ",
+				  "CE", pinf->row, pinf->bank, pinf->col);
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "Bit Position: %d Data: 0x%08x\n",
+				 pinf->bitpos, pinf->data);
+		} else {
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "DDR ECC error type:%s Row %d Bank %d Col %d ",
+				  "CE", pinf->row, pinf->bank, pinf->col);
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "BankGroup Number %d Block Number %d ",
+				 pinf->bankgrpnr, pinf->blknr);
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "Bit Position: %d Data: 0x%08x\n",
+				 pinf->bitpos, pinf->data);
+		}
+
 		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
 				     p->ce_cnt, 0, 0, 0, 0, 0, -1,
 				     priv->message, "");
@@ -408,9 +489,19 @@ static void handle_error(struct mem_ctl_info *mci, struct synps_ecc_status *p)
 
 	if (p->ue_cnt) {
 		pinf = &p->ueinfo;
-		snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
-			 "DDR ECC error type :%s Row %d Bank %d Col %d ",
-			 "UE", pinf->row, pinf->bank, pinf->col);
+		if (!priv->p_data->quirks) {
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "DDR ECC error type :%s Row %d Bank %d Col %d ",
+				"UE", pinf->row, pinf->bank, pinf->col);
+		} else {
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "DDR ECC error type :%s Row %d Bank %d Col %d ",
+				 "UE", pinf->row, pinf->bank, pinf->col);
+			snprintf(priv->message, SYNPS_EDAC_MSG_SIZE,
+				 "BankGroup Number %d Block Number %d",
+				 pinf->bankgrpnr, pinf->blknr);
+		}
+
 		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
 				     p->ue_cnt, 0, 0, 0, 0, 0, -1,
 				     priv->message, "");
@@ -420,6 +511,42 @@ static void handle_error(struct mem_ctl_info *mci, struct synps_ecc_status *p)
 }
 
 /**
+ * intr_handler - Interrupt Handler for ECC interrupts.
+ * @irq:        IRQ number.
+ * @dev_id:     Device ID.
+ *
+ * Return: IRQ_NONE, if interrupt not set or IRQ_HANDLED otherwise.
+ */
+static irqreturn_t intr_handler(int irq, void *dev_id)
+{
+	const struct synps_platform_data *p_data;
+	struct mem_ctl_info *mci = dev_id;
+	struct synps_edac_priv *priv;
+	int status, regval;
+
+	priv = mci->pvt_info;
+	p_data = priv->p_data;
+
+	regval = readl(priv->baseaddr + DDR_QOS_IRQ_STAT_OFST);
+	regval &= (DDR_QOSCE_MASK | DDR_QOSUE_MASK);
+	if (!(regval & ECC_CE_UE_INTR_MASK))
+		return IRQ_NONE;
+
+	status = p_data->get_error_info(priv);
+	if (status)
+		return IRQ_NONE;
+
+	priv->ce_cnt += priv->stat.ce_cnt;
+	priv->ue_cnt += priv->stat.ue_cnt;
+	handle_error(mci, &priv->stat);
+
+	edac_dbg(3, "Total error count CE %d UE %d\n",
+		 priv->ce_cnt, priv->ue_cnt);
+	writel(regval, priv->baseaddr + DDR_QOS_IRQ_STAT_OFST);
+	return IRQ_HANDLED;
+}
+
+/**
  * check_errors - Check controller for ECC errors.
  * @mci:	EDAC memory controller instance.
  *
@@ -427,10 +554,13 @@ static void handle_error(struct mem_ctl_info *mci, struct synps_ecc_status *p)
  */
 static void check_errors(struct mem_ctl_info *mci)
 {
-	struct synps_edac_priv *priv = mci->pvt_info;
-	const struct synps_platform_data *p_data = priv->p_data;
+	const struct synps_platform_data *p_data;
+	struct synps_edac_priv *priv;
 	int status;
 
+	priv = mci->pvt_info;
+	p_data = priv->p_data;
+
 	status = p_data->get_error_info(priv);
 	if (status)
 		return;
@@ -475,6 +605,39 @@ static enum dev_type zynq_get_dtype(const void __iomem *base)
 }
 
 /**
+ * zynqmp_get_dtype - Return the controller memory width.
+ * @base:	DDR memory controller base address.
+ *
+ * Get the EDAC device type width appropriate for the current controller
+ * configuration.
+ *
+ * Return: a device type width enumeration.
+ */
+static enum dev_type zynqmp_get_dtype(const void __iomem *base)
+{
+	enum dev_type dt;
+	u32 width;
+
+	width = readl(base + CTRL_OFST);
+	width = (width & ECC_CTRL_BUSWIDTH_MASK) >> ECC_CTRL_BUSWIDTH_SHIFT;
+	switch (width) {
+	case DDRCTL_EWDTH_16:
+		dt = DEV_X2;
+		break;
+	case DDRCTL_EWDTH_32:
+		dt = DEV_X4;
+		break;
+	case DDRCTL_EWDTH_64:
+		dt = DEV_X8;
+		break;
+	default:
+		dt = DEV_UNKNOWN;
+	}
+
+	return dt;
+}
+
+/**
  * zynq_get_ecc_state - Return the controller ECC enable/disable status.
  * @base:	DDR memory controller base address.
  *
@@ -484,19 +647,43 @@ static enum dev_type zynq_get_dtype(const void __iomem *base)
  */
 static bool zynq_get_ecc_state(void __iomem *base)
 {
-	bool state = false;
 	enum dev_type dt;
 	u32 ecctype;
 
 	dt = zynq_get_dtype(base);
 	if (dt == DEV_UNKNOWN)
-		return state;
+		return false;
 
 	ecctype = readl(base + SCRUB_OFST) & SCRUB_MODE_MASK;
 	if ((ecctype == SCRUB_MODE_SECDED) && (dt == DEV_X2))
-		state = true;
+		return true;
+
+	return false;
+}
+
+/**
+ * zynqmp_get_ecc_state - Return the controller ECC enable/disable status.
+ * @base:	DDR memory controller base address.
+ *
+ * Get the ECC enable/disable status for the controller.
+ *
+ * Return: a ECC status boolean i.e true/false - enabled/disabled.
+ */
+static bool zynqmp_get_ecc_state(void __iomem *base)
+{
+	enum dev_type dt;
+	u32 ecctype;
 
-	return state;
+	dt = zynqmp_get_dtype(base);
+	if (dt == DEV_UNKNOWN)
+		return false;
+
+	ecctype = readl(base + ECC_CFG0_OFST) & SCRUB_MODE_MASK;
+	if ((ecctype == SCRUB_MODE_SECDED) &&
+	    ((dt == DEV_X2) || (dt == DEV_X4) || (dt == DEV_X8)))
+		return true;
+
+	return false;
 }
 
 /**
@@ -538,6 +725,34 @@ static enum mem_type zynq_get_mtype(const void __iomem *base)
 }
 
 /**
+ * zynqmp_get_mtype - Returns controller memory type.
+ * @base:	Synopsys ECC status structure.
+ *
+ * Get the EDAC memory type appropriate for the current controller
+ * configuration.
+ *
+ * Return: a memory type enumeration.
+ */
+static enum mem_type zynqmp_get_mtype(const void __iomem *base)
+{
+	enum mem_type mt;
+	u32 memtype;
+
+	memtype = readl(base + CTRL_OFST);
+
+	if ((memtype & MEM_TYPE_DDR3) || (memtype & MEM_TYPE_LPDDR3))
+		mt = MEM_DDR3;
+	else if (memtype & MEM_TYPE_DDR2)
+		mt = MEM_RDDR2;
+	else if ((memtype & MEM_TYPE_LPDDR4) || (memtype & MEM_TYPE_DDR4))
+		mt = MEM_DDR4;
+	else
+		mt = MEM_EMPTY;
+
+	return mt;
+}
+
+/**
  * init_csrows - Initialize the csrow data.
  * @mci:	EDAC memory controller instance.
  *
@@ -598,13 +813,57 @@ static void mc_init(struct mem_ctl_info *mci, struct platform_device *pdev)
 	mci->dev_name = SYNPS_EDAC_MOD_STRING;
 	mci->mod_name = SYNPS_EDAC_MOD_VER;
 
-	edac_op_state = EDAC_OPSTATE_POLL;
-	mci->edac_check = check_errors;
+	if (priv->p_data->quirks & DDR_ECC_INTR_SUPPORT) {
+		edac_op_state = EDAC_OPSTATE_INT;
+	} else {
+		edac_op_state = EDAC_OPSTATE_POLL;
+		mci->edac_check = check_errors;
+	}
+
 	mci->ctl_page_to_phys = NULL;
 
 	init_csrows(mci);
 }
 
+static void enable_intr(struct synps_edac_priv *priv)
+{
+	/* Enable UE/CE Interrupts */
+	writel(DDR_QOSUE_MASK | DDR_QOSCE_MASK,
+			priv->baseaddr + DDR_QOS_IRQ_EN_OFST);
+}
+
+static void disable_intr(struct synps_edac_priv *priv)
+{
+	/* Disable UE/CE Interrupts */
+	writel(DDR_QOSUE_MASK | DDR_QOSCE_MASK,
+			priv->baseaddr + DDR_QOS_IRQ_DB_OFST);
+}
+
+static int setup_irq(struct mem_ctl_info *mci,
+		     struct platform_device *pdev)
+{
+	struct synps_edac_priv *priv = mci->pvt_info;
+	int ret, irq;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		edac_printk(KERN_ERR, EDAC_MC,
+			    "No IRQ %d in DT\n", irq);
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, intr_handler,
+			       0, dev_name(&pdev->dev), mci);
+	if (ret < 0) {
+		edac_printk(KERN_ERR, EDAC_MC, "Failed to request IRQ\n");
+		return ret;
+	}
+
+	enable_intr(priv);
+
+	return 0;
+}
+
 static const struct synps_platform_data zynq_edac_def = {
 	.get_error_info	= zynq_get_error_info,
 	.get_mtype	= zynq_get_mtype,
@@ -613,9 +872,26 @@ static const struct synps_platform_data zynq_edac_def = {
 	.quirks		= 0,
 };
 
+static const struct synps_platform_data zynqmp_edac_def = {
+	.get_error_info	= zynqmp_get_error_info,
+	.get_mtype	= zynqmp_get_mtype,
+	.get_dtype	= zynqmp_get_dtype,
+	.get_ecc_state	= zynqmp_get_ecc_state,
+	.quirks		= DDR_ECC_INTR_SUPPORT,
+};
+
 static const struct of_device_id synps_edac_match[] = {
-	{ .compatible = "xlnx,zynq-ddrc-a05", .data = (void *)&zynq_edac_def },
-	{ /* end of table */ }
+	{
+		.compatible = "xlnx,zynq-ddrc-a05",
+		.data = (void *)&zynq_edac_def
+	},
+	{
+		.compatible = "xlnx,zynqmp-ddrc-2.40a",
+		.data = (void *)&zynqmp_edac_def
+	},
+	{
+		/* end of table */
+	}
 };
 
 MODULE_DEVICE_TABLE(of, synps_edac_match);
@@ -674,6 +950,12 @@ static int mc_probe(struct platform_device *pdev)
 
 	mc_init(mci, pdev);
 
+	if (priv->p_data->quirks & DDR_ECC_INTR_SUPPORT) {
+		rc = setup_irq(mci, pdev);
+		if (rc)
+			goto free_edac_mc;
+	}
+
 	rc = edac_mc_add_mc(mci);
 	if (rc) {
 		edac_printk(KERN_ERR, EDAC_MC,
@@ -685,7 +967,9 @@ static int mc_probe(struct platform_device *pdev)
 	 * Start capturing the correctable and uncorrectable errors. A write of
 	 * 0 starts the counters.
 	 */
-	writel(0x0, baseaddr + ECC_CTRL_OFST);
+	if (!(priv->p_data->quirks & DDR_ECC_INTR_SUPPORT))
+		writel(0x0, baseaddr + ECC_CTRL_OFST);
+
 	return rc;
 
 free_edac_mc:
@@ -703,6 +987,10 @@ free_edac_mc:
 static int mc_remove(struct platform_device *pdev)
 {
 	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+	struct synps_edac_priv *priv = mci->pvt_info;
+
+	if (priv->p_data->quirks & DDR_ECC_INTR_SUPPORT)
+		disable_intr(priv);
 
 	edac_mc_del_mc(&pdev->dev);
 	edac_mc_free(mci);