net: stmmac: xgmac: Implement tx_queue_prio()

Implement the TX Queue Priority callback in XGMAC core.
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h

@@ -127,6 +127,10 @@
 #define XGMAC_MTL_RXQ_DMA_MAP1		0x00001034
 #define XGMAC_QxMDMACH(x)		GENMASK((x) * 8 + 3, (x) * 8)
 #define XGMAC_QxMDMACH_SHIFT(x)		((x) * 8)
+#define XGMAC_TC_PRTY_MAP0		0x00001040
+#define XGMAC_TC_PRTY_MAP1		0x00001044
+#define XGMAC_PSTC(x)			GENMASK((x) * 8 + 7, (x) * 8)
+#define XGMAC_PSTC_SHIFT(x)		((x) * 8)
 #define XGMAC_MTL_TXQ_OPMODE(x)		(0x00001100 + (0x80 * (x)))
 #define XGMAC_TQS			GENMASK(25, 16)
 #define XGMAC_TQS_SHIFT			16

drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c

@@ -118,6 +118,23 @@ static void dwxgmac2_rx_queue_prio(struct mac_device_info *hw, u32 prio,
 	writel(value, ioaddr + reg);
 }
 
+static void dwxgmac2_tx_queue_prio(struct mac_device_info *hw, u32 prio,
+				   u32 queue)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value, reg;
+
+	reg = (queue < 4) ? XGMAC_TC_PRTY_MAP0 : XGMAC_TC_PRTY_MAP1;
+	if (queue >= 4)
+		queue -= 4;
+
+	value = readl(ioaddr + reg);
+	value &= ~XGMAC_PSTC(queue);
+	value |= (prio << XGMAC_PSTC_SHIFT(queue)) & XGMAC_PSTC(queue);
+
+	writel(value, ioaddr + reg);
+}
+
 static void dwxgmac2_prog_mtl_rx_algorithms(struct mac_device_info *hw,
 					    u32 rx_alg)
 {
@@ -428,7 +445,7 @@ const struct stmmac_ops dwxgmac210_ops = {
 	.rx_ipc = dwxgmac2_rx_ipc,
 	.rx_queue_enable = dwxgmac2_rx_queue_enable,
 	.rx_queue_prio = dwxgmac2_rx_queue_prio,
-	.tx_queue_prio = NULL,
+	.tx_queue_prio = dwxgmac2_tx_queue_prio,
 	.rx_queue_routing = NULL,
 	.prog_mtl_rx_algorithms = dwxgmac2_prog_mtl_rx_algorithms,
 	.prog_mtl_tx_algorithms = dwxgmac2_prog_mtl_tx_algorithms,