net: enetc: save the mode register address inside struct enetc_cbdr

enetc_clear_cbdr depends on struct enetc_hw because it must disable the
ring through a register write. We'd like to remove that dependency, so
let's do what's already done with the producer and consumer indices,
which is to save the iomem address in a variable kept in struct enetc_cbdr.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/enetc/enetc.c

@@ -1074,7 +1074,7 @@ int enetc_alloc_si_resources(struct enetc_ndev_priv *priv)
 	return 0;
 
 err_alloc_cls:
-	enetc_clear_cbdr(&si->hw);
+	enetc_clear_cbdr(&si->cbd_ring);
 	enetc_free_cbdr(&si->cbd_ring);
 
 	return err;
@@ -1084,7 +1084,7 @@ void enetc_free_si_resources(struct enetc_ndev_priv *priv)
 {
 	struct enetc_si *si = priv->si;
 
-	enetc_clear_cbdr(&si->hw);
+	enetc_clear_cbdr(&si->cbd_ring);
 	enetc_free_cbdr(&si->cbd_ring);
 
 	kfree(priv->cls_rules);

drivers/net/ethernet/freescale/enetc/enetc.h

@@ -98,6 +98,7 @@ struct enetc_cbdr {
 	void *bd_base; /* points to Rx or Tx BD ring */
 	void __iomem *pir;
 	void __iomem *cir;
+	void __iomem *mr; /* mode register */
 
 	int bd_count; /* # of BDs */
 	int next_to_use;
@@ -314,7 +315,7 @@ void enetc_set_ethtool_ops(struct net_device *ndev);
 int enetc_setup_cbdr(struct device *dev, struct enetc_hw *hw,
 		     struct enetc_cbdr *cbdr);
 void enetc_free_cbdr(struct enetc_cbdr *cbdr);
-void enetc_clear_cbdr(struct enetc_hw *hw);
+void enetc_clear_cbdr(struct enetc_cbdr *cbdr);
 int enetc_set_mac_flt_entry(struct enetc_si *si, int index,
 			    char *mac_addr, int si_map);
 int enetc_clear_mac_flt_entry(struct enetc_si *si, int index);

drivers/net/ethernet/freescale/enetc/enetc_cbdr.c

@@ -24,6 +24,10 @@ int enetc_setup_cbdr(struct device *dev, struct enetc_hw *hw,
 	cbdr->next_to_use = 0;
 	cbdr->dma_dev = dev;
 
+	cbdr->pir = hw->reg + ENETC_SICBDRPIR;
+	cbdr->cir = hw->reg + ENETC_SICBDRCIR;
+	cbdr->mr = hw->reg + ENETC_SICBDRMR;
+
 	/* set CBDR cache attributes */
 	enetc_wr(hw, ENETC_SICAR2,
 		 ENETC_SICAR_RD_COHERENT | ENETC_SICAR_WR_COHERENT);
@@ -32,14 +36,10 @@ int enetc_setup_cbdr(struct device *dev, struct enetc_hw *hw,
 	enetc_wr(hw, ENETC_SICBDRBAR1, upper_32_bits(cbdr->bd_dma_base));
 	enetc_wr(hw, ENETC_SICBDRLENR, ENETC_RTBLENR_LEN(cbdr->bd_count));
 
-	enetc_wr(hw, ENETC_SICBDRPIR, 0);
-	enetc_wr(hw, ENETC_SICBDRCIR, 0);
-
+	enetc_wr_reg(cbdr->pir, cbdr->next_to_clean);
+	enetc_wr_reg(cbdr->cir, cbdr->next_to_use);
 	/* enable ring */
-	enetc_wr(hw, ENETC_SICBDRMR, BIT(31));
-
-	cbdr->pir = hw->reg + ENETC_SICBDRPIR;
-	cbdr->cir = hw->reg + ENETC_SICBDRCIR;
+	enetc_wr_reg(cbdr->mr, BIT(31));
 
 	return 0;
 }
@@ -54,9 +54,10 @@ void enetc_free_cbdr(struct enetc_cbdr *cbdr)
 	cbdr->dma_dev = NULL;
 }
 
-void enetc_clear_cbdr(struct enetc_hw *hw)
+void enetc_clear_cbdr(struct enetc_cbdr *cbdr)
 {
-	enetc_wr(hw, ENETC_SICBDRMR, 0);
+	/* disable ring */
+	enetc_wr_reg(cbdr->mr, 0);
 }
 
 static void enetc_clean_cbdr(struct enetc_cbdr *ring)

drivers/net/ethernet/freescale/enetc/enetc_pf.c

@@ -1095,7 +1095,7 @@ static void enetc_init_unused_port(struct enetc_si *si)
 	enetc_init_port_rfs_memory(si);
 	enetc_init_port_rss_memory(si);
 
-	enetc_clear_cbdr(hw);
+	enetc_clear_cbdr(&si->cbd_ring);
 	enetc_free_cbdr(&si->cbd_ring);
 }