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@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230901080935.14571-12-tinghan.shen@mediatek.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: tinghan-shen

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
@@ -63,6 +67,7 @@
 #define MT8195_CORE1_SW_RSTN_CLR		0x20000
 #define MT8195_CORE1_SW_RSTN_SET		0x20004
 #define MT8195_CORE1_MEM_ATT_PREDEF		0x20008
+#define MT8195_CORE1_WDT_IRQ			0x20030
 #define MT8195_CORE1_WDT_CFG			0x20034
 
 #define MT8195_SEC_CTRL				0x85000

drivers/remoteproc/mtk_scp.c

@@ -222,6 +222,29 @@ 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->cluster->reg_base + MT8192_SCP2APMCU_IPC_SET);
+
+	if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
+		scp_ipi_handler(scp);
+	} else {
+		u32 reason = readl(scp->cluster->reg_base + MT8195_SYS_STATUS);
+
+		if (reason & MT8195_CORE0_WDT)
+			writel(1, scp->cluster->reg_base + MT8192_CORE0_WDT_IRQ);
+
+		if (reason & MT8195_CORE1_WDT)
+			writel(1, scp->cluster->reg_base + MT8195_CORE1_WDT_IRQ);
+
+		scp_wdt_handler(scp, reason);
+	}
+
+	writel(scp_to_host, scp->cluster->reg_base + MT8192_SCP2APMCU_IPC_CLR);
+}
+
 static void mt8195_scp_c1_irq_handler(struct mtk_scp *scp)
 {
 	u32 scp_to_host;
@@ -1256,7 +1279,7 @@ 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,