linux-kernel - [PATCHv2 07/11] EDAC, altera: Add status offset & masks

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Date:	Mon, 7 Mar 2016 13:43:03 -0600
From:	<tthayer@...nsource.altera.com>
To:	<bp@...en8.de>, <dougthompson@...ssion.com>,
	<m.chehab@...sung.com>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <linux@....linux.org.uk>,
	<dinguyen@...nsource.altera.com>, <grant.likely@...aro.org>
CC:	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <tthayer.linux@...il.com>,
	<tthayer@...nsource.altera.com>
Subject: [PATCHv2 07/11] EDAC, altera: Add status offset & masks

From: Thor Thayer <tthayer@...nsource.altera.com>

In preparation for the Arria10 peripheral ECCs, the IRQ
status needs to be determined because the IRQs are shared.
The IRQ status register is read to determine if the IRQ
was for this ECC peripheral. Cyclone5 and Arria5 have
dedicated IRQs so the confirmation mechanism is not
required and the mask is set to 0.

Signed-off-by: Thor Thayer <tthayer@...nsource.altera.com>
---
v2: Split large patch into smaller patches. Determine
    if IRQ matches this ECC peripheral before handling it.
---
 drivers/edac/altera_edac.c |   41 +++++++++++++++++++++++++++++++----------
 drivers/edac/altera_edac.h |    3 +++
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index fd73a77..11b7291 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -556,19 +556,32 @@ static irqreturn_t altr_edac_device_handler(int irq, void *dev_id)
 	struct edac_device_ctl_info *dci = dev_id;
 	struct altr_edac_device_dev *drvdata = dci->pvt_info;
 	const struct edac_device_prv_data *priv = drvdata->data;
+	void __iomem *status_addr = drvdata->status + priv->err_status_ofst;
 	void __iomem *clear_addr = drvdata->status + priv->clear_err_ofst;
 
+	/*
+	 * CycloneV is directly mapped to a specific IRQ. Arria10
+	 * shares the IRQ with other ECCs so we must match first.
+	 */
 	if (irq == drvdata->sb_irq) {
-		if (priv->ce_clear_mask)
-			writel(priv->ce_clear_mask, clear_addr);
-		edac_device_handle_ce(dci, 0, 0, drvdata->edac_dev_name);
-		ret_value = IRQ_HANDLED;
+		if (!priv->ce_status_mask ||
+		    (priv->ce_status_mask & readl(status_addr))) {
+			if (priv->ce_clear_mask)
+				writel(priv->ce_clear_mask, clear_addr);
+			edac_device_handle_ce(dci, 0, 0,
+					      drvdata->edac_dev_name);
+			ret_value = IRQ_HANDLED;
+		}
 	} else if (irq == drvdata->db_irq) {
-		if (priv->ue_clear_mask)
-			writel(priv->ue_clear_mask, clear_addr);
-		edac_device_handle_ue(dci, 0, 0, drvdata->edac_dev_name);
-		panic("\nEDAC:ECC_DEVICE[Uncorrectable errors]\n");
-		ret_value = IRQ_HANDLED;
+		if (!priv->ue_status_mask ||
+		    (priv->ue_status_mask & readl(status_addr))) {
+			if (priv->ue_clear_mask)
+				writel(priv->ue_clear_mask, clear_addr);
+			edac_device_handle_ue(dci, 0, 0,
+					      drvdata->edac_dev_name);
+			panic("\nEDAC:ECC_DEVICE[Uncorrectable errors]\n");
+			ret_value = IRQ_HANDLED;
+		}
 	} else {
 		WARN_ON(1);
 	}
@@ -882,6 +895,10 @@ const struct edac_device_prv_data ocramecc_data = {
 	.ce_clear_mask = (ALTR_OCR_ECC_EN | ALTR_OCR_ECC_SERR),
 	.ue_clear_mask = (ALTR_OCR_ECC_EN | ALTR_OCR_ECC_DERR),
 	.clear_err_ofst = ALTR_OCR_ECC_REG_OFFSET,
+	/* Cyclone5 & Arria5 have separate IRQs so status = 0 */
+	.ce_status_mask = 0,
+	.ue_status_mask = 0,
+	.err_status_ofst = 0,
 	.dbgfs_name = "altr_ocram_trigger",
 	.alloc_mem = ocram_alloc_mem,
 	.free_mem = ocram_free_mem,
@@ -957,7 +974,11 @@ const struct edac_device_prv_data l2ecc_data = {
 	.setup = altr_l2_check_deps,
 	.ce_clear_mask = 0,
 	.ue_clear_mask = 0,
-	.clear_err_ofst = ALTR_L2_ECC_REG_OFFSET,
+	.clear_err_ofst = ALTR_MAN_GRP_L2_ECC_OFFSET,
+	/* Cyclone5 & Arria5 have separate IRQs so status = 0 */
+	.ce_status_mask = 0,
+	.ue_status_mask = 0,
+	.err_status_ofst = 0,
 	.dbgfs_name = "altr_l2_trigger",
 	.alloc_mem = l2_alloc_mem,
 	.free_mem = l2_free_mem,
diff --git a/drivers/edac/altera_edac.h b/drivers/edac/altera_edac.h
index b262f74..43e0dae 100644
--- a/drivers/edac/altera_edac.h
+++ b/drivers/edac/altera_edac.h
@@ -226,6 +226,9 @@ struct edac_device_prv_data {
 	int ce_clear_mask;
 	int ue_clear_mask;
 	int clear_err_ofst;
+	int ce_status_mask;
+	int ue_status_mask;
+	int err_status_ofst;
 	char dbgfs_name[20];
 	void * (*alloc_mem)(size_t size, void **other);
 	void (*free_mem)(void *p, size_t size, void *other);
-- 
1.7.9.5