net: stmmac: Add CBS support in XGMAC2

XGMAC2 uses the same CBS mechanism as GMAC5, only registers offset
changes. Lets use the same TC callbacks and implement the .config_cbs
callback in XGMAC2 core.
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -119,11 +119,23 @@
 #define XGMAC_MTL_TXQ_OPMODE(x)		(0x00001100 + (0x80 * (x)))
 #define XGMAC_TQS			GENMASK(25, 16)
 #define XGMAC_TQS_SHIFT			16
+#define XGMAC_Q2TCMAP			GENMASK(10, 8)
+#define XGMAC_Q2TCMAP_SHIFT		8
 #define XGMAC_TTC			GENMASK(6, 4)
 #define XGMAC_TTC_SHIFT			4
 #define XGMAC_TXQEN			GENMASK(3, 2)
 #define XGMAC_TXQEN_SHIFT		2
 #define XGMAC_TSF			BIT(1)
+#define XGMAC_MTL_TCx_ETS_CONTROL(x)	(0x00001110 + (0x80 * (x)))
+#define XGMAC_MTL_TCx_QUANTUM_WEIGHT(x)	(0x00001118 + (0x80 * (x)))
+#define XGMAC_MTL_TCx_SENDSLOPE(x)	(0x0000111c + (0x80 * (x)))
+#define XGMAC_MTL_TCx_HICREDIT(x)	(0x00001120 + (0x80 * (x)))
+#define XGMAC_MTL_TCx_LOCREDIT(x)	(0x00001124 + (0x80 * (x)))
+#define XGMAC_CC			BIT(3)
+#define XGMAC_TSA			GENMASK(1, 0)
+#define XGMAC_SP			(0x0 << 0)
+#define XGMAC_CBS			(0x1 << 0)
+#define XGMAC_ETS			(0x2 << 0)
 #define XGMAC_MTL_RXQ_OPMODE(x)		(0x00001140 + (0x80 * (x)))
 #define XGMAC_RQS			GENMASK(25, 16)
 #define XGMAC_RQS_SHIFT			16

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

@@ -177,6 +177,23 @@ static void dwxgmac2_map_mtl_to_dma(struct mac_device_info *hw, u32 queue,
 	writel(value, ioaddr + reg);
 }
 
+static void dwxgmac2_config_cbs(struct mac_device_info *hw,
+				u32 send_slope, u32 idle_slope,
+				u32 high_credit, u32 low_credit, u32 queue)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value;
+
+	writel(send_slope, ioaddr + XGMAC_MTL_TCx_SENDSLOPE(queue));
+	writel(idle_slope, ioaddr + XGMAC_MTL_TCx_QUANTUM_WEIGHT(queue));
+	writel(high_credit, ioaddr + XGMAC_MTL_TCx_HICREDIT(queue));
+	writel(low_credit, ioaddr + XGMAC_MTL_TCx_LOCREDIT(queue));
+
+	value = readl(ioaddr + XGMAC_MTL_TCx_ETS_CONTROL(queue));
+	value |= XGMAC_CC | XGMAC_CBS;
+	writel(value, ioaddr + XGMAC_MTL_TCx_ETS_CONTROL(queue));
+}
+
 static int dwxgmac2_host_irq_status(struct mac_device_info *hw,
 				    struct stmmac_extra_stats *x)
 {
@@ -316,7 +333,7 @@ const struct stmmac_ops dwxgmac210_ops = {
 	.prog_mtl_tx_algorithms = dwxgmac2_prog_mtl_tx_algorithms,
 	.set_mtl_tx_queue_weight = NULL,
 	.map_mtl_to_dma = dwxgmac2_map_mtl_to_dma,
-	.config_cbs = NULL,
+	.config_cbs = dwxgmac2_config_cbs,
 	.dump_regs = NULL,
 	.host_irq_status = dwxgmac2_host_irq_status,
 	.host_mtl_irq_status = dwxgmac2_host_mtl_irq_status,

drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c

@@ -182,6 +182,9 @@ static void dwxgmac2_dma_tx_mode(void __iomem *ioaddr, int mode,
 			value |= 0x7 << XGMAC_TTC_SHIFT;
 	}
 
+	/* Use static TC to Queue mapping */
+	value |= (channel << XGMAC_Q2TCMAP_SHIFT) & XGMAC_Q2TCMAP;
+
 	value &= ~XGMAC_TXQEN;
 	if (qmode != MTL_QUEUE_AVB)
 		value |= 0x2 << XGMAC_TXQEN_SHIFT;
@@ -374,6 +377,21 @@ static void dwxgmac2_enable_tso(void __iomem *ioaddr, bool en, u32 chan)
 	writel(value, ioaddr + XGMAC_DMA_CH_TX_CONTROL(chan));
 }
 
+static void dwxgmac2_qmode(void __iomem *ioaddr, u32 channel, u8 qmode)
+{
+	u32 value = readl(ioaddr + XGMAC_MTL_TXQ_OPMODE(channel));
+
+	value &= ~XGMAC_TXQEN;
+	if (qmode != MTL_QUEUE_AVB) {
+		value |= 0x2 << XGMAC_TXQEN_SHIFT;
+		writel(0, ioaddr + XGMAC_MTL_TCx_ETS_CONTROL(channel));
+	} else {
+		value |= 0x1 << XGMAC_TXQEN_SHIFT;
+	}
+
+	writel(value, ioaddr +  XGMAC_MTL_TXQ_OPMODE(channel));
+}
+
 static void dwxgmac2_set_bfsize(void __iomem *ioaddr, int bfsize, u32 chan)
 {
 	u32 value;
@@ -407,5 +425,6 @@ const struct stmmac_dma_ops dwxgmac210_dma_ops = {
 	.set_rx_tail_ptr = dwxgmac2_set_rx_tail_ptr,
 	.set_tx_tail_ptr = dwxgmac2_set_tx_tail_ptr,
 	.enable_tso = dwxgmac2_enable_tso,
+	.qmode = dwxgmac2_qmode,
 	.set_bfsize = dwxgmac2_set_bfsize,
 };

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

@@ -201,7 +201,7 @@ static const struct stmmac_hwif_entry {
 		.mac = &dwxgmac210_ops,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = NULL,
-		.tc = NULL,
+		.tc = &dwmac510_tc_ops,
 		.setup = dwxgmac2_setup,
 		.quirks = NULL,
 	},