linux-kernel - [PATCHv3 2/3] EDAC/synopsys: add support for version 3 of the Synopsys EDAC DDR

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Date:   Tue, 28 Sep 2021 11:04:22 -0500
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     michal.simek@...inx.com
Cc:     dinguyen@...nel.org, bp@...en8.de, mchehab@...nel.org,
        tony.luck@...el.com, james.morse@....com, rric@...nel.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org
Subject: [PATCHv3 2/3] EDAC/synopsys: add support for version 3 of the Synopsys EDAC DDR

Adds support for version 3.80a of the Synopsys DDR controller with EDAC. This
version of the controller has the following differences:

- UE/CE are auto cleared
- Interrupts are supported by default

Signed-off-by: Dinh Nguyen <dinguyen@...nel.org>
---
v3: Address comments from Michal Simek
    use bit macro
    removed extra "cleared" word from comment section about v3.0
v2: remove "This patch" from commit message
---
 drivers/edac/synopsys_edac.c | 49 ++++++++++++++++++++++++++++++------
 1 file changed, 42 insertions(+), 7 deletions(-)

diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
index bf237fccb444..66ee37ea0acc 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -101,6 +101,7 @@
 /* DDR ECC Quirks */
 #define DDR_ECC_INTR_SUPPORT		BIT(0)
 #define DDR_ECC_DATA_POISON_SUPPORT	BIT(1)
+#define DDR_ECC_INTR_SELF_CLEAR		BIT(2)
 
 /* ZynqMP Enhanced DDR memory controller registers that are relevant to ECC */
 /* ECC Configuration Registers */
@@ -171,6 +172,10 @@
 #define DDR_QOS_IRQ_EN_OFST		0x20208
 #define DDR_QOS_IRQ_DB_OFST		0x2020C
 
+/* DDR QOS Interrupt register definitions */
+#define DDR_UE_MASK			BIT(9)
+#define DDR_CE_MASK			BIT(8)
+
 /* ECC Corrected Error Register Mask and Shifts*/
 #define ECC_CEADDR0_RW_MASK		0x3FFFF
 #define ECC_CEADDR0_RNK_MASK		BIT(24)
@@ -533,10 +538,16 @@ static irqreturn_t intr_handler(int irq, void *dev_id)
 	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;
+	/*
+	 * v3.0 of the controller has the ce/ue bits cleared automatically,
+	 * so this condition does not apply.
+	 */
+	if (!(priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR)) {
+		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)
@@ -548,7 +559,9 @@ static irqreturn_t intr_handler(int irq, void *dev_id)
 
 	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);
+	/* v3.0 of the controller does not have this register */
+	if (!(priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR))
+		writel(regval, priv->baseaddr + DDR_QOS_IRQ_STAT_OFST);
 	return IRQ_HANDLED;
 }
 
@@ -834,8 +847,13 @@ static void mc_init(struct mem_ctl_info *mci, struct platform_device *pdev)
 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);
+	if (priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR)
+		writel(DDR_UE_MASK | DDR_CE_MASK,
+		       priv->baseaddr + ECC_CLR_OFST);
+	else
+		writel(DDR_QOSUE_MASK | DDR_QOSCE_MASK,
+		       priv->baseaddr + DDR_QOS_IRQ_EN_OFST);
+
 }
 
 static void disable_intr(struct synps_edac_priv *priv)
@@ -890,6 +908,19 @@ static const struct synps_platform_data zynqmp_edac_def = {
 			  ),
 };
 
+static const struct synps_platform_data synopsys_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 | DDR_ECC_INTR_SELF_CLEAR
+#ifdef CONFIG_EDAC_DEBUG
+			  | DDR_ECC_DATA_POISON_SUPPORT
+#endif
+			  ),
+};
+
+
 static const struct of_device_id synps_edac_match[] = {
 	{
 		.compatible = "xlnx,zynq-ddrc-a05",
@@ -899,6 +930,10 @@ static const struct of_device_id synps_edac_match[] = {
 		.compatible = "xlnx,zynqmp-ddrc-2.40a",
 		.data = (void *)&zynqmp_edac_def
 	},
+	{
+		.compatible = "snps,ddrc-3.80a",
+		.data = (void *)&synopsys_edac_def
+	},
 	{
 		/* end of table */
 	}
-- 
2.25.1