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Date:   Mon, 16 Apr 2018 16:08:13 +0100
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     netdev@...r.kernel.org
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: [PATCH net-next 2/5] net: stmmac: Switch stmmac_dma_ops to generic HW Interface Helpers

Switch stmmac_dma_ops to generic Hardware Interface Helpers instead of
using hard-coded callbacks. This makes the code more readable and more
flexible.

No functional change.

Signed-off-by: Jose Abreu <joabreu@...opsys.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Joao Pinto <jpinto@...opsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: Alexandre Torgue <alexandre.torgue@...com>
---
 drivers/net/ethernet/stmicro/stmmac/common.h       |  50 -------
 drivers/net/ethernet/stmicro/stmmac/hwif.h         | 106 +++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_ethtool.c   |  14 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 147 +++++++++------------
 4 files changed, 172 insertions(+), 145 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 2c50d8c..b27221b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -381,56 +381,6 @@ struct dma_features {
 extern const struct stmmac_desc_ops enh_desc_ops;
 extern const struct stmmac_desc_ops ndesc_ops;
 
-/* Specific DMA helpers */
-struct stmmac_dma_ops {
-	/* DMA core initialization */
-	int (*reset)(void __iomem *ioaddr);
-	void (*init)(void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg,
-		     u32 dma_tx, u32 dma_rx, int atds);
-	void (*init_chan)(void __iomem *ioaddr,
-			  struct stmmac_dma_cfg *dma_cfg, u32 chan);
-	void (*init_rx_chan)(void __iomem *ioaddr,
-			     struct stmmac_dma_cfg *dma_cfg,
-			     u32 dma_rx_phy, u32 chan);
-	void (*init_tx_chan)(void __iomem *ioaddr,
-			     struct stmmac_dma_cfg *dma_cfg,
-			     u32 dma_tx_phy, u32 chan);
-	/* Configure the AXI Bus Mode Register */
-	void (*axi)(void __iomem *ioaddr, struct stmmac_axi *axi);
-	/* Dump DMA registers */
-	void (*dump_regs)(void __iomem *ioaddr, u32 *reg_space);
-	/* Set tx/rx threshold in the csr6 register
-	 * An invalid value enables the store-and-forward mode */
-	void (*dma_mode)(void __iomem *ioaddr, int txmode, int rxmode,
-			 int rxfifosz);
-	void (*dma_rx_mode)(void __iomem *ioaddr, int mode, u32 channel,
-			    int fifosz, u8 qmode);
-	void (*dma_tx_mode)(void __iomem *ioaddr, int mode, u32 channel,
-			    int fifosz, u8 qmode);
-	/* To track extra statistic (if supported) */
-	void (*dma_diagnostic_fr) (void *data, struct stmmac_extra_stats *x,
-				   void __iomem *ioaddr);
-	void (*enable_dma_transmission) (void __iomem *ioaddr);
-	void (*enable_dma_irq)(void __iomem *ioaddr, u32 chan);
-	void (*disable_dma_irq)(void __iomem *ioaddr, u32 chan);
-	void (*start_tx)(void __iomem *ioaddr, u32 chan);
-	void (*stop_tx)(void __iomem *ioaddr, u32 chan);
-	void (*start_rx)(void __iomem *ioaddr, u32 chan);
-	void (*stop_rx)(void __iomem *ioaddr, u32 chan);
-	int (*dma_interrupt) (void __iomem *ioaddr,
-			      struct stmmac_extra_stats *x, u32 chan);
-	/* If supported then get the optional core features */
-	void (*get_hw_feature)(void __iomem *ioaddr,
-			       struct dma_features *dma_cap);
-	/* Program the HW RX Watchdog */
-	void (*rx_watchdog)(void __iomem *ioaddr, u32 riwt, u32 number_chan);
-	void (*set_tx_ring_len)(void __iomem *ioaddr, u32 len, u32 chan);
-	void (*set_rx_ring_len)(void __iomem *ioaddr, u32 len, u32 chan);
-	void (*set_rx_tail_ptr)(void __iomem *ioaddr, u32 tail_ptr, u32 chan);
-	void (*set_tx_tail_ptr)(void __iomem *ioaddr, u32 tail_ptr, u32 chan);
-	void (*enable_tso)(void __iomem *ioaddr, bool en, u32 chan);
-};
-
 struct mac_device_info;
 
 /* Helpers to program the MAC core */
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 4994677..e1a9ae6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -122,4 +122,110 @@ struct stmmac_desc_ops {
 #define stmmac_set_mss(__priv, __args...) \
 	stmmac_do_void_callback(__priv, desc, set_mss, __args)
 
+struct stmmac_dma_cfg;
+struct dma_features;
+
+/* Specific DMA helpers */
+struct stmmac_dma_ops {
+	/* DMA core initialization */
+	int (*reset)(void __iomem *ioaddr);
+	void (*init)(void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg,
+		     u32 dma_tx, u32 dma_rx, int atds);
+	void (*init_chan)(void __iomem *ioaddr,
+			  struct stmmac_dma_cfg *dma_cfg, u32 chan);
+	void (*init_rx_chan)(void __iomem *ioaddr,
+			     struct stmmac_dma_cfg *dma_cfg,
+			     u32 dma_rx_phy, u32 chan);
+	void (*init_tx_chan)(void __iomem *ioaddr,
+			     struct stmmac_dma_cfg *dma_cfg,
+			     u32 dma_tx_phy, u32 chan);
+	/* Configure the AXI Bus Mode Register */
+	void (*axi)(void __iomem *ioaddr, struct stmmac_axi *axi);
+	/* Dump DMA registers */
+	void (*dump_regs)(void __iomem *ioaddr, u32 *reg_space);
+	/* Set tx/rx threshold in the csr6 register
+	 * An invalid value enables the store-and-forward mode */
+	void (*dma_mode)(void __iomem *ioaddr, int txmode, int rxmode,
+			 int rxfifosz);
+	void (*dma_rx_mode)(void __iomem *ioaddr, int mode, u32 channel,
+			    int fifosz, u8 qmode);
+	void (*dma_tx_mode)(void __iomem *ioaddr, int mode, u32 channel,
+			    int fifosz, u8 qmode);
+	/* To track extra statistic (if supported) */
+	void (*dma_diagnostic_fr) (void *data, struct stmmac_extra_stats *x,
+				   void __iomem *ioaddr);
+	void (*enable_dma_transmission) (void __iomem *ioaddr);
+	void (*enable_dma_irq)(void __iomem *ioaddr, u32 chan);
+	void (*disable_dma_irq)(void __iomem *ioaddr, u32 chan);
+	void (*start_tx)(void __iomem *ioaddr, u32 chan);
+	void (*stop_tx)(void __iomem *ioaddr, u32 chan);
+	void (*start_rx)(void __iomem *ioaddr, u32 chan);
+	void (*stop_rx)(void __iomem *ioaddr, u32 chan);
+	int (*dma_interrupt) (void __iomem *ioaddr,
+			      struct stmmac_extra_stats *x, u32 chan);
+	/* If supported then get the optional core features */
+	void (*get_hw_feature)(void __iomem *ioaddr,
+			       struct dma_features *dma_cap);
+	/* Program the HW RX Watchdog */
+	void (*rx_watchdog)(void __iomem *ioaddr, u32 riwt, u32 number_chan);
+	void (*set_tx_ring_len)(void __iomem *ioaddr, u32 len, u32 chan);
+	void (*set_rx_ring_len)(void __iomem *ioaddr, u32 len, u32 chan);
+	void (*set_rx_tail_ptr)(void __iomem *ioaddr, u32 tail_ptr, u32 chan);
+	void (*set_tx_tail_ptr)(void __iomem *ioaddr, u32 tail_ptr, u32 chan);
+	void (*enable_tso)(void __iomem *ioaddr, bool en, u32 chan);
+};
+
+#define stmmac_reset(__priv, __args...) \
+	stmmac_do_callback(__priv, dma, reset, __args)
+#define stmmac_dma_init(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, init, __args)
+#define stmmac_init_chan(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, init_chan, __args)
+#define stmmac_init_rx_chan(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, init_rx_chan, __args)
+#define stmmac_init_tx_chan(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, init_tx_chan, __args)
+#define stmmac_axi(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, axi, __args)
+#define stmmac_dump_dma_regs(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, dump_regs, __args)
+#define stmmac_dma_mode(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, dma_mode, __args)
+#define stmmac_dma_rx_mode(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, dma_rx_mode, __args)
+#define stmmac_dma_tx_mode(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, dma_tx_mode, __args)
+#define stmmac_dma_diagnostic_fr(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, dma_diagnostic_fr, __args)
+#define stmmac_enable_dma_transmission(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, enable_dma_transmission, __args)
+#define stmmac_enable_dma_irq(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, enable_dma_irq, __args)
+#define stmmac_disable_dma_irq(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, disable_dma_irq, __args)
+#define stmmac_start_tx(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, start_tx, __args)
+#define stmmac_stop_tx(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, stop_tx, __args)
+#define stmmac_start_rx(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, start_rx, __args)
+#define stmmac_stop_rx(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, stop_rx, __args)
+#define stmmac_dma_interrupt_status(__priv, __args...) \
+	stmmac_do_callback(__priv, dma, dma_interrupt, __args)
+#define stmmac_get_hw_feature(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, get_hw_feature, __args)
+#define stmmac_rx_watchdog(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, rx_watchdog, __args)
+#define stmmac_set_tx_ring_len(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, set_tx_ring_len, __args)
+#define stmmac_set_rx_ring_len(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, set_rx_ring_len, __args)
+#define stmmac_set_rx_tail_ptr(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, set_rx_tail_ptr, __args)
+#define stmmac_set_tx_tail_ptr(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, set_tx_tail_ptr, __args)
+#define stmmac_enable_tso(__priv, __args...) \
+	stmmac_do_void_callback(__priv, dma, enable_tso, __args)
+
 #endif /* __STMMAC_HWIF_H__ */
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 2c6ed47..7009718 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -443,7 +443,7 @@ static void stmmac_ethtool_gregs(struct net_device *dev,
 	memset(reg_space, 0x0, REG_SPACE_SIZE);
 
 	priv->hw->mac->dump_regs(priv->hw, reg_space);
-	priv->hw->dma->dump_regs(priv->ioaddr, reg_space);
+	stmmac_dump_dma_regs(priv, priv->ioaddr, reg_space);
 	/* Copy DMA registers to where ethtool expects them */
 	memcpy(&reg_space[ETHTOOL_DMA_OFFSET], &reg_space[DMA_BUS_MODE / 4],
 	       NUM_DWMAC1000_DMA_REGS * 4);
@@ -529,7 +529,7 @@ static void stmmac_get_ethtool_stats(struct net_device *dev,
 	u32 rx_queues_count = priv->plat->rx_queues_to_use;
 	u32 tx_queues_count = priv->plat->tx_queues_to_use;
 	unsigned long count;
-	int i, j = 0;
+	int i, j = 0, ret;
 
 	if (priv->dma_cap.asp && priv->hw->mac->safety_feat_dump) {
 		dump = priv->hw->mac->safety_feat_dump;
@@ -541,11 +541,9 @@ static void stmmac_get_ethtool_stats(struct net_device *dev,
 	}
 
 	/* Update the DMA HW counters for dwmac10/100 */
-	if (priv->hw->dma->dma_diagnostic_fr)
-		priv->hw->dma->dma_diagnostic_fr(&dev->stats,
-						 (void *) &priv->xstats,
-						 priv->ioaddr);
-	else {
+	ret = stmmac_dma_diagnostic_fr(priv, &dev->stats, (void *) &priv->xstats,
+			priv->ioaddr);
+	if (ret) {
 		/* If supported, for new GMAC chips expose the MMC counters */
 		if (priv->dma_cap.rmon) {
 			dwmac_mmc_read(priv->mmcaddr, &priv->mmc);
@@ -810,7 +808,7 @@ static int stmmac_set_coalesce(struct net_device *dev,
 	priv->tx_coal_frames = ec->tx_max_coalesced_frames;
 	priv->tx_coal_timer = ec->tx_coalesce_usecs;
 	priv->rx_riwt = rx_riwt;
-	priv->hw->dma->rx_watchdog(priv->ioaddr, priv->rx_riwt, rx_cnt);
+	stmmac_rx_watchdog(priv, priv->ioaddr, priv->rx_riwt, rx_cnt);
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c44e19d..7f2aeae 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1677,7 +1677,7 @@ static void stmmac_mac_enable_rx_queues(struct stmmac_priv *priv)
 static void stmmac_start_rx_dma(struct stmmac_priv *priv, u32 chan)
 {
 	netdev_dbg(priv->dev, "DMA RX processes started in channel %d\n", chan);
-	priv->hw->dma->start_rx(priv->ioaddr, chan);
+	stmmac_start_rx(priv, priv->ioaddr, chan);
 }
 
 /**
@@ -1690,7 +1690,7 @@ static void stmmac_start_rx_dma(struct stmmac_priv *priv, u32 chan)
 static void stmmac_start_tx_dma(struct stmmac_priv *priv, u32 chan)
 {
 	netdev_dbg(priv->dev, "DMA TX processes started in channel %d\n", chan);
-	priv->hw->dma->start_tx(priv->ioaddr, chan);
+	stmmac_start_tx(priv, priv->ioaddr, chan);
 }
 
 /**
@@ -1703,7 +1703,7 @@ static void stmmac_start_tx_dma(struct stmmac_priv *priv, u32 chan)
 static void stmmac_stop_rx_dma(struct stmmac_priv *priv, u32 chan)
 {
 	netdev_dbg(priv->dev, "DMA RX processes stopped in channel %d\n", chan);
-	priv->hw->dma->stop_rx(priv->ioaddr, chan);
+	stmmac_stop_rx(priv, priv->ioaddr, chan);
 }
 
 /**
@@ -1716,7 +1716,7 @@ static void stmmac_stop_rx_dma(struct stmmac_priv *priv, u32 chan)
 static void stmmac_stop_tx_dma(struct stmmac_priv *priv, u32 chan)
 {
 	netdev_dbg(priv->dev, "DMA TX processes stopped in channel %d\n", chan);
-	priv->hw->dma->stop_tx(priv->ioaddr, chan);
+	stmmac_stop_tx(priv, priv->ioaddr, chan);
 }
 
 /**
@@ -1807,19 +1807,18 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 		for (chan = 0; chan < rx_channels_count; chan++) {
 			qmode = priv->plat->rx_queues_cfg[chan].mode_to_use;
 
-			priv->hw->dma->dma_rx_mode(priv->ioaddr, rxmode, chan,
-						   rxfifosz, qmode);
+			stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan,
+					rxfifosz, qmode);
 		}
 
 		for (chan = 0; chan < tx_channels_count; chan++) {
 			qmode = priv->plat->tx_queues_cfg[chan].mode_to_use;
 
-			priv->hw->dma->dma_tx_mode(priv->ioaddr, txmode, chan,
-						   txfifosz, qmode);
+			stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan,
+					txfifosz, qmode);
 		}
 	} else {
-		priv->hw->dma->dma_mode(priv->ioaddr, txmode, rxmode,
-					rxfifosz);
+		stmmac_dma_mode(priv, priv->ioaddr, txmode, rxmode, rxfifosz);
 	}
 }
 
@@ -1927,16 +1926,6 @@ static void stmmac_tx_clean(struct stmmac_priv *priv, u32 queue)
 	netif_tx_unlock(priv->dev);
 }
 
-static inline void stmmac_enable_dma_irq(struct stmmac_priv *priv, u32 chan)
-{
-	priv->hw->dma->enable_dma_irq(priv->ioaddr, chan);
-}
-
-static inline void stmmac_disable_dma_irq(struct stmmac_priv *priv, u32 chan)
-{
-	priv->hw->dma->disable_dma_irq(priv->ioaddr, chan);
-}
-
 /**
  * stmmac_tx_err - to manage the tx error
  * @priv: driver private structure
@@ -2000,13 +1989,12 @@ static void stmmac_set_dma_operation_mode(struct stmmac_priv *priv, u32 txmode,
 	txfifosz /= tx_channels_count;
 
 	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
-		priv->hw->dma->dma_rx_mode(priv->ioaddr, rxmode, chan,
-					   rxfifosz, rxqmode);
-		priv->hw->dma->dma_tx_mode(priv->ioaddr, txmode, chan,
-					   txfifosz, txqmode);
+		stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan, rxfifosz,
+				rxqmode);
+		stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan, txfifosz,
+				txqmode);
 	} else {
-		priv->hw->dma->dma_mode(priv->ioaddr, txmode, rxmode,
-					rxfifosz);
+		stmmac_dma_mode(priv, priv->ioaddr, txmode, rxmode, rxfifosz);
 	}
 }
 
@@ -2050,16 +2038,15 @@ static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 	 * all tx queues rather than just a single tx queue.
 	 */
 	for (chan = 0; chan < channels_to_check; chan++)
-		status[chan] = priv->hw->dma->dma_interrupt(priv->ioaddr,
-							    &priv->xstats,
-							    chan);
+		status[chan] = stmmac_dma_interrupt_status(priv, priv->ioaddr,
+				&priv->xstats, chan);
 
 	for (chan = 0; chan < rx_channel_count; chan++) {
 		if (likely(status[chan] & handle_rx)) {
 			struct stmmac_rx_queue *rx_q = &priv->rx_queue[chan];
 
 			if (likely(napi_schedule_prep(&rx_q->napi))) {
-				stmmac_disable_dma_irq(priv, chan);
+				stmmac_disable_dma_irq(priv, priv->ioaddr, chan);
 				__napi_schedule(&rx_q->napi);
 				poll_scheduled = true;
 			}
@@ -2080,7 +2067,8 @@ static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 					&priv->rx_queue[0];
 
 				if (likely(napi_schedule_prep(&rx_q->napi))) {
-					stmmac_disable_dma_irq(priv, chan);
+					stmmac_disable_dma_irq(priv,
+							priv->ioaddr, chan);
 					__napi_schedule(&rx_q->napi);
 				}
 				break;
@@ -2176,15 +2164,7 @@ static void stmmac_selec_desc_mode(struct stmmac_priv *priv)
  */
 static int stmmac_get_hw_features(struct stmmac_priv *priv)
 {
-	u32 ret = 0;
-
-	if (priv->hw->dma->get_hw_feature) {
-		priv->hw->dma->get_hw_feature(priv->ioaddr,
-					      &priv->dma_cap);
-		ret = 1;
-	}
-
-	return ret;
+	return stmmac_get_hw_feature(priv, priv->ioaddr, &priv->dma_cap) == 0;
 }
 
 /**
@@ -2234,7 +2214,7 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 	if (priv->extend_desc && (priv->mode == STMMAC_RING_MODE))
 		atds = 1;
 
-	ret = priv->hw->dma->reset(priv->ioaddr);
+	ret = stmmac_reset(priv, priv->ioaddr);
 	if (ret) {
 		dev_err(priv->device, "Failed to reset the dma\n");
 		return ret;
@@ -2242,51 +2222,48 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 
 	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
 		/* DMA Configuration */
-		priv->hw->dma->init(priv->ioaddr, priv->plat->dma_cfg,
-				    dummy_dma_tx_phy, dummy_dma_rx_phy, atds);
+		stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg,
+				dummy_dma_tx_phy, dummy_dma_rx_phy, atds);
 
 		/* DMA RX Channel Configuration */
 		for (chan = 0; chan < rx_channels_count; chan++) {
 			rx_q = &priv->rx_queue[chan];
 
-			priv->hw->dma->init_rx_chan(priv->ioaddr,
-						    priv->plat->dma_cfg,
-						    rx_q->dma_rx_phy, chan);
+			stmmac_init_rx_chan(priv, priv->ioaddr,
+					priv->plat->dma_cfg, rx_q->dma_rx_phy,
+					chan);
 
 			rx_q->rx_tail_addr = rx_q->dma_rx_phy +
 				    (DMA_RX_SIZE * sizeof(struct dma_desc));
-			priv->hw->dma->set_rx_tail_ptr(priv->ioaddr,
-						       rx_q->rx_tail_addr,
-						       chan);
+			stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
+					rx_q->rx_tail_addr, chan);
 		}
 
 		/* DMA TX Channel Configuration */
 		for (chan = 0; chan < tx_channels_count; chan++) {
 			tx_q = &priv->tx_queue[chan];
 
-			priv->hw->dma->init_chan(priv->ioaddr,
-						 priv->plat->dma_cfg,
-						 chan);
+			stmmac_init_chan(priv, priv->ioaddr,
+					priv->plat->dma_cfg, chan);
 
-			priv->hw->dma->init_tx_chan(priv->ioaddr,
-						    priv->plat->dma_cfg,
-						    tx_q->dma_tx_phy, chan);
+			stmmac_init_tx_chan(priv, priv->ioaddr,
+					priv->plat->dma_cfg, tx_q->dma_tx_phy,
+					chan);
 
 			tx_q->tx_tail_addr = tx_q->dma_tx_phy +
 				    (DMA_TX_SIZE * sizeof(struct dma_desc));
-			priv->hw->dma->set_tx_tail_ptr(priv->ioaddr,
-						       tx_q->tx_tail_addr,
-						       chan);
+			stmmac_set_tx_tail_ptr(priv, priv->ioaddr,
+					tx_q->tx_tail_addr, chan);
 		}
 	} else {
 		rx_q = &priv->rx_queue[chan];
 		tx_q = &priv->tx_queue[chan];
-		priv->hw->dma->init(priv->ioaddr, priv->plat->dma_cfg,
-				    tx_q->dma_tx_phy, rx_q->dma_rx_phy, atds);
+		stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg,
+				tx_q->dma_tx_phy, rx_q->dma_rx_phy, atds);
 	}
 
-	if (priv->plat->axi && priv->hw->dma->axi)
-		priv->hw->dma->axi(priv->ioaddr, priv->plat->axi);
+	if (priv->plat->axi)
+		stmmac_axi(priv, priv->ioaddr, priv->plat->axi);
 
 	return ret;
 }
@@ -2332,18 +2309,14 @@ static void stmmac_set_rings_length(struct stmmac_priv *priv)
 	u32 chan;
 
 	/* set TX ring length */
-	if (priv->hw->dma->set_tx_ring_len) {
-		for (chan = 0; chan < tx_channels_count; chan++)
-			priv->hw->dma->set_tx_ring_len(priv->ioaddr,
-						       (DMA_TX_SIZE - 1), chan);
-	}
+	for (chan = 0; chan < tx_channels_count; chan++)
+		stmmac_set_tx_ring_len(priv, priv->ioaddr,
+				(DMA_TX_SIZE - 1), chan);
 
 	/* set RX ring length */
-	if (priv->hw->dma->set_rx_ring_len) {
-		for (chan = 0; chan < rx_channels_count; chan++)
-			priv->hw->dma->set_rx_ring_len(priv->ioaddr,
-						       (DMA_RX_SIZE - 1), chan);
-	}
+	for (chan = 0; chan < rx_channels_count; chan++)
+		stmmac_set_rx_ring_len(priv, priv->ioaddr,
+				(DMA_RX_SIZE - 1), chan);
 }
 
 /**
@@ -2619,9 +2592,10 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 
 	priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
 
-	if ((priv->use_riwt) && (priv->hw->dma->rx_watchdog)) {
-		priv->rx_riwt = MAX_DMA_RIWT;
-		priv->hw->dma->rx_watchdog(priv->ioaddr, MAX_DMA_RIWT, rx_cnt);
+	if (priv->use_riwt) {
+		ret = stmmac_rx_watchdog(priv, priv->ioaddr, MAX_DMA_RIWT, rx_cnt);
+		if (!ret)
+			priv->rx_riwt = MAX_DMA_RIWT;
 	}
 
 	if (priv->hw->pcs && priv->hw->mac->pcs_ctrl_ane)
@@ -2633,7 +2607,7 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 	/* Enable TSO */
 	if (priv->tso) {
 		for (chan = 0; chan < tx_cnt; chan++)
-			priv->hw->dma->enable_tso(priv->ioaddr, 1, chan);
+			stmmac_enable_tso(priv, priv->ioaddr, 1, chan);
 	}
 
 	return 0;
@@ -3058,8 +3032,7 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
 
-	priv->hw->dma->set_tx_tail_ptr(priv->ioaddr, tx_q->tx_tail_addr,
-				       queue);
+	stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_q->tx_tail_addr, queue);
 
 	return NETDEV_TX_OK;
 
@@ -3271,10 +3244,10 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 	netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
 
 	if (priv->synopsys_id < DWMAC_CORE_4_00)
-		priv->hw->dma->enable_dma_transmission(priv->ioaddr);
+		stmmac_enable_dma_transmission(priv, priv->ioaddr);
 	else
-		priv->hw->dma->set_tx_tail_ptr(priv->ioaddr, tx_q->tx_tail_addr,
-					       queue);
+		stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_q->tx_tail_addr,
+				queue);
 
 	return NETDEV_TX_OK;
 
@@ -3608,7 +3581,7 @@ static int stmmac_poll(struct napi_struct *napi, int budget)
 	work_done = stmmac_rx(priv, budget, rx_q->queue_index);
 	if (work_done < budget) {
 		napi_complete_done(napi, work_done);
-		stmmac_enable_dma_irq(priv, chan);
+		stmmac_enable_dma_irq(priv, priv->ioaddr, chan);
 	}
 	return work_done;
 }
@@ -3778,11 +3751,11 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 				priv->hw->mac->host_mtl_irq_status(priv->hw,
 								   queue);
 
-				if (status & CORE_IRQ_MTL_RX_OVERFLOW &&
-				    priv->hw->dma->set_rx_tail_ptr)
-					priv->hw->dma->set_rx_tail_ptr(priv->ioaddr,
-								rx_q->rx_tail_addr,
-								queue);
+				if (status & CORE_IRQ_MTL_RX_OVERFLOW)
+					stmmac_set_rx_tail_ptr(priv,
+							priv->ioaddr,
+							rx_q->rx_tail_addr,
+							queue);
 			}
 		}
 
-- 
2.9.3


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