linux-kernel - [PATCH net-next v4 5/9] net: stmmac: xgmac: support per-channel irq

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Message-Id: <20230816152926.4093-6-jszhang@kernel.org>
Date:   Wed, 16 Aug 2023 23:29:22 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH net-next v4 5/9] net: stmmac: xgmac: support per-channel irq

The IP supports per channel interrupt, add support for this usage case.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 .../net/ethernet/stmicro/stmmac/dwxgmac2.h    |  2 ++
 .../ethernet/stmicro/stmmac/dwxgmac2_dma.c    | 33 +++++++++++--------
 2 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
index 7f68bef456b7..18a042834d75 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
@@ -340,6 +340,8 @@
 
 /* DMA Registers */
 #define XGMAC_DMA_MODE			0x00003000
+#define XGMAC_INTM			GENMASK(13, 12)
+#define XGMAC_INTM_MODE1		0x1
 #define XGMAC_SWR			BIT(0)
 #define XGMAC_DMA_SYSBUS_MODE		0x00003004
 #define XGMAC_WR_OSR_LMT		GENMASK(29, 24)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
index 1ef8fc132c2d..ce228c362403 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -31,6 +31,13 @@ static void dwxgmac2_dma_init(void __iomem *ioaddr,
 		value |= XGMAC_EAME;
 
 	writel(value, ioaddr + XGMAC_DMA_SYSBUS_MODE);
+
+	if (dma_cfg->perch_irq_en) {
+		value = readl(ioaddr + XGMAC_DMA_MODE);
+		value &= ~XGMAC_INTM;
+		value |= FIELD_PREP(XGMAC_INTM, XGMAC_INTM_MODE1);
+		writel(value, ioaddr + XGMAC_DMA_MODE);
+	}
 }
 
 static void dwxgmac2_dma_init_chan(struct stmmac_priv *priv,
@@ -365,20 +372,20 @@ static int dwxgmac2_dma_interrupt(struct stmmac_priv *priv,
 	}
 
 	/* TX/RX NORMAL interrupts */
-	if (likely(intr_status & XGMAC_NIS)) {
-		if (likely(intr_status & XGMAC_RI)) {
-			u64_stats_update_begin(&rx_q->rxq_stats.syncp);
-			rx_q->rxq_stats.rx_normal_irq_n++;
-			u64_stats_update_end(&rx_q->rxq_stats.syncp);
-			ret |= handle_rx;
-		}
-		if (likely(intr_status & (XGMAC_TI | XGMAC_TBU))) {
-			u64_stats_update_begin(&tx_q->txq_stats.syncp);
-			tx_q->txq_stats.tx_normal_irq_n++;
-			u64_stats_update_end(&tx_q->txq_stats.syncp);
-			ret |= handle_tx;
-		}
+	if (likely(intr_status & XGMAC_RI)) {
+		u64_stats_update_begin(&rx_q->rxq_stats.syncp);
+		rx_q->rxq_stats.rx_normal_irq_n++;
+		u64_stats_update_end(&rx_q->rxq_stats.syncp);
+		ret |= handle_rx;
+	}
+	if (likely(intr_status & XGMAC_TI)) {
+		u64_stats_update_begin(&tx_q->txq_stats.syncp);
+		tx_q->txq_stats.tx_normal_irq_n++;
+		u64_stats_update_end(&tx_q->txq_stats.syncp);
+		ret |= handle_tx;
 	}
+	if (unlikely(intr_status & XGMAC_TBU))
+		ret |= handle_tx;
 
 	/* Clear interrupts */
 	writel(intr_en & intr_status, ioaddr + XGMAC_DMA_CH_STATUS(chan));
-- 
2.40.1