net: stmmac: Integrate XGMAC into main driver flow

Now that we have all the XGMAC related callbacks, lets start integrating
this IP block into main driver.

Also, we corrected the initialization flow to only start DMA after
setting descriptors length.
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>
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -51,6 +51,7 @@
 #include <linux/reset.h>
 #include <linux/of_mdio.h>
 #include "dwmac1000.h"
+#include "dwxgmac2.h"
 #include "hwif.h"
 
 #define	STMMAC_ALIGN(x)		__ALIGN_KERNEL(x, SMP_CACHE_BYTES)
@@ -262,6 +263,21 @@ static void stmmac_clk_csr_set(struct stmmac_priv *priv)
 		else
 			priv->clk_csr = 0;
 	}
+
+	if (priv->plat->has_xgmac) {
+		if (clk_rate > 400000000)
+			priv->clk_csr = 0x5;
+		else if (clk_rate > 350000000)
+			priv->clk_csr = 0x4;
+		else if (clk_rate > 300000000)
+			priv->clk_csr = 0x3;
+		else if (clk_rate > 250000000)
+			priv->clk_csr = 0x2;
+		else if (clk_rate > 150000000)
+			priv->clk_csr = 0x1;
+		else
+			priv->clk_csr = 0x0;
+	}
 }
 
 static void print_pkt(unsigned char *buf, int len)
@@ -498,7 +514,7 @@ static void stmmac_get_rx_hwtstamp(struct stmmac_priv *priv, struct dma_desc *p,
 	if (!priv->hwts_rx_en)
 		return;
 	/* For GMAC4, the valid timestamp is from CTX next desc. */
-	if (priv->plat->has_gmac4)
+	if (priv->plat->has_gmac4 || priv->plat->has_xgmac)
 		desc = np;
 
 	/* Check if timestamp is available */
@@ -540,6 +556,9 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
 	u32 ts_event_en = 0;
 	u32 value = 0;
 	u32 sec_inc;
+	bool xmac;
+
+	xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
 
 	if (!(priv->dma_cap.time_stamp || priv->adv_ts)) {
 		netdev_alert(priv->dev, "No support for HW time stamping\n");
@@ -575,7 +594,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
 			/* PTP v1, UDP, any kind of event packet */
 			config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
 			/* take time stamp for all event messages */
-			if (priv->plat->has_gmac4)
+			if (xmac)
 				snap_type_sel = PTP_GMAC4_TCR_SNAPTYPSEL_1;
 			else
 				snap_type_sel = PTP_TCR_SNAPTYPSEL_1;
@@ -610,7 +629,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
 			config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
 			ptp_v2 = PTP_TCR_TSVER2ENA;
 			/* take time stamp for all event messages */
-			if (priv->plat->has_gmac4)
+			if (xmac)
 				snap_type_sel = PTP_GMAC4_TCR_SNAPTYPSEL_1;
 			else
 				snap_type_sel = PTP_TCR_SNAPTYPSEL_1;
@@ -647,7 +666,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
 			config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 			ptp_v2 = PTP_TCR_TSVER2ENA;
 			/* take time stamp for all event messages */
-			if (priv->plat->has_gmac4)
+			if (xmac)
 				snap_type_sel = PTP_GMAC4_TCR_SNAPTYPSEL_1;
 			else
 				snap_type_sel = PTP_TCR_SNAPTYPSEL_1;
@@ -718,7 +737,7 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
 		/* program Sub Second Increment reg */
 		stmmac_config_sub_second_increment(priv,
 				priv->ptpaddr, priv->plat->clk_ptp_rate,
-				priv->plat->has_gmac4, &sec_inc);
+				xmac, &sec_inc);
 		temp = div_u64(1000000000ULL, sec_inc);
 
 		/* Store sub second increment and flags for later use */
@@ -755,12 +774,14 @@ static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)
  */
 static int stmmac_init_ptp(struct stmmac_priv *priv)
 {
+	bool xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
+
 	if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp))
 		return -EOPNOTSUPP;
 
 	priv->adv_ts = 0;
-	/* Check if adv_ts can be enabled for dwmac 4.x core */
-	if (priv->plat->has_gmac4 && priv->dma_cap.atime_stamp)
+	/* Check if adv_ts can be enabled for dwmac 4.x / xgmac core */
+	if (xmac && priv->dma_cap.atime_stamp)
 		priv->adv_ts = 1;
 	/* Dwmac 3.x core with extend_desc can support adv_ts */
 	else if (priv->extend_desc && priv->dma_cap.atime_stamp)
@@ -2173,6 +2194,12 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 		return ret;
 	}
 
+	/* DMA Configuration */
+	stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg, atds);
+
+	if (priv->plat->axi)
+		stmmac_axi(priv, priv->ioaddr, priv->plat->axi);
+
 	/* DMA RX Channel Configuration */
 	for (chan = 0; chan < rx_channels_count; chan++) {
 		rx_q = &priv->rx_queue[chan];
@@ -2203,12 +2230,6 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 	for (chan = 0; chan < dma_csr_ch; chan++)
 		stmmac_init_chan(priv, priv->ioaddr, priv->plat->dma_cfg, chan);
 
-	/* DMA Configuration */
-	stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg, atds);
-
-	if (priv->plat->axi)
-		stmmac_axi(priv, priv->ioaddr, priv->plat->axi);
-
 	return ret;
 }
 
@@ -2526,9 +2547,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 		netdev_warn(priv->dev, "%s: failed debugFS registration\n",
 			    __func__);
 #endif
-	/* Start the ball rolling... */
-	stmmac_start_all_dma(priv);
-
 	priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
 
 	if (priv->use_riwt) {
@@ -2549,6 +2567,9 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 			stmmac_enable_tso(priv, priv->ioaddr, 1, chan);
 	}
 
+	/* Start the ball rolling... */
+	stmmac_start_all_dma(priv);
+
 	return 0;
 }
 
@@ -3305,6 +3326,9 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 	int coe = priv->hw->rx_csum;
 	unsigned int next_entry;
 	unsigned int count = 0;
+	bool xmac;
+
+	xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
 
 	if (netif_msg_rx_status(priv)) {
 		void *rx_head;
@@ -3406,7 +3430,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 			 * in case of GMAC4 because it needs
 			 * to refill the used descriptors, always.
 			 */
-			if (unlikely(!priv->plat->has_gmac4 &&
+			if (unlikely(!xmac &&
 				     ((frame_len < priv->rx_copybreak) ||
 				     stmmac_rx_threshold_count(rx_q)))) {
 				skb = netdev_alloc_skb_ip_align(priv->dev,
@@ -3642,7 +3666,9 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 	u32 tx_cnt = priv->plat->tx_queues_to_use;
 	u32 queues_count;
 	u32 queue;
+	bool xmac;
 
+	xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac;
 	queues_count = (rx_cnt > tx_cnt) ? rx_cnt : tx_cnt;
 
 	if (priv->irq_wake)
@@ -3661,7 +3687,7 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 		return IRQ_HANDLED;
 
 	/* To handle GMAC own interrupts */
-	if ((priv->plat->has_gmac) || (priv->plat->has_gmac4)) {
+	if ((priv->plat->has_gmac) || xmac) {
 		int status = stmmac_host_irq_status(priv, priv->hw, &priv->xstats);
 		int mtl_status;
 
@@ -4269,6 +4295,8 @@ int stmmac_dvr_probe(struct device *device,
 	ndev->min_mtu = ETH_ZLEN - ETH_HLEN;
 	if ((priv->plat->enh_desc) || (priv->synopsys_id >= DWMAC_CORE_4_00))
 		ndev->max_mtu = JUMBO_LEN;
+	else if (priv->plat->has_xgmac)
+		ndev->max_mtu = XGMAC_JUMBO_LEN;
 	else
 		ndev->max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);
 	/* Will not overwrite ndev->max_mtu if plat->maxmtu > ndev->max_mtu
@@ -4290,7 +4318,8 @@ int stmmac_dvr_probe(struct device *device,
 	 * has to be disable and this can be done by passing the
 	 * riwt_off field from the platform.
 	 */
-	if ((priv->synopsys_id >= DWMAC_CORE_3_50) && (!priv->plat->riwt_off)) {
+	if (((priv->synopsys_id >= DWMAC_CORE_3_50) ||
+	    (priv->plat->has_xgmac)) && (!priv->plat->riwt_off)) {
 		priv->use_riwt = 1;
 		dev_info(priv->device,
 			 "Enable RX Mitigation via HW Watchdog Timer\n");