linux-kernel - [PATCH v3 10/11] remoteproc: mediatek: Handle MT8195 SCP core 1 watchdog timeout

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Message-ID: <20220927025606.26673-11-tinghan.shen@mediatek.com>
Date:   Tue, 27 Sep 2022 10:56:05 +0800
From:   Tinghan Shen <tinghan.shen@...iatek.com>
To:     Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>
CC:     <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>
Subject: [PATCH v3 10/11] remoteproc: mediatek: Handle MT8195 SCP core 1 watchdog timeout

The MT8195 SCP core 1 watchdog timeout needs to be handled in the
SCP core 0 IRQ handler because the MT8195 SCP core 1 watchdog timeout
IRQ is wired on the same IRQ entry for core 0 watchdog timeout.
MT8195 SCP has a watchdog status register to identify the watchdog
timeout source when IRQ triggered.

Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
---
 drivers/remoteproc/mtk_common.h |  4 +++
 drivers/remoteproc/mtk_scp.c    | 44 ++++++++++++++++++++++++++++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index dcde25f8bbf9..6cd04ca9e681 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -55,6 +55,10 @@
 #define MT8192_CORE0_WDT_IRQ		0x10030
 #define MT8192_CORE0_WDT_CFG		0x10034
 
+#define MT8195_SYS_STATUS		0x4004
+#define MT8195_CORE0_WDT		BIT(16)
+#define MT8195_CORE1_WDT		BIT(17)
+
 #define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS		GENMASK(7, 4)
 
 #define MT8195_CPU1_SRAM_PD			0x1084
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 0f1b587f8502..159f3c69cd69 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -222,6 +222,48 @@ static void mt8192_scp_irq_handler(struct mtk_scp *scp)
 	}
 }
 
+static void mt8195_scp_irq_handler(struct mtk_scp *scp)
+{
+	u32 scp_to_host;
+
+	scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
+
+	if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
+		scp_ipi_handler(scp);
+	} else {
+		if (readl(scp->reg_base + MT8195_SYS_STATUS) & MT8195_CORE1_WDT) {
+			struct device_node *c1_np;
+			struct platform_device *c1_pdev;
+			struct mtk_scp *c1_scp;
+
+			writel(1, scp->reg_base + MT8195_CORE1_WDT_IRQ);
+
+			c1_np = of_get_compatible_child(scp->dev->of_node,
+							"mediatek,mt8195-scp-core");
+			if (!c1_np) {
+				dev_err(scp->dev, "cannot find core 1 node\n");
+				goto clear_irq;
+			}
+
+			c1_pdev = of_find_device_by_node(c1_np);
+			of_node_put(c1_np);
+			if (!c1_pdev) {
+				dev_err(scp->dev, "cannot find core 1 pdev\n");
+				goto clear_irq;
+			}
+
+			c1_scp = platform_get_drvdata(c1_pdev);
+			scp_wdt_handler(c1_scp, scp_to_host);
+		} else {
+			writel(1, scp->reg_base + MT8192_CORE0_WDT_IRQ);
+			scp_wdt_handler(scp, scp_to_host);
+		}
+	}
+
+clear_irq:
+	writel(scp_to_host, scp->reg_base + MT8192_SCP2APMCU_IPC_CLR);
+}
+
 static void mt8195_scp_c1_irq_handler(struct mtk_scp *scp)
 {
 	u32 scp_to_host;
@@ -1155,7 +1197,7 @@ static const struct mtk_scp_of_data mt8192_of_data = {
 static const struct mtk_scp_of_data mt8195_of_data = {
 	.scp_clk_get = mt8195_scp_clk_get,
 	.scp_before_load = mt8195_scp_before_load,
-	.scp_irq_handler = mt8192_scp_irq_handler,
+	.scp_irq_handler = mt8195_scp_irq_handler,
 	.scp_reset_assert = mt8192_scp_reset_assert,
 	.scp_reset_deassert = mt8192_scp_reset_deassert,
 	.scp_stop = mt8195_scp_stop,
-- 
2.18.0