net: stmmac: move hardware setup for stmmac_open to new function

This patch moves hardware setup part of the code in stmmac_open to a new
function stmmac_hw_setup, the reason for doing this is to make hw
initialization independent function so that PM functions can re-use it to
re-initialize the IP after returning from low power state.
This will also avoid code duplication across stmmac_resume/restore and
stmmac_open.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 532f2b4..341c8dc 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1585,6 +1585,86 @@ static void stmmac_init_tx_coalesce(struct stmmac_priv *priv)
        add_timer(&priv->txtimer);
 }
 
+/**
+ * stmmac_hw_setup: setup mac in a usable state.
+ *  @dev : pointer to the device structure.
+ *  Description:
+ *  This function sets up the ip in a usable state.
+ *  Return value:
+ *  0 on success and an appropriate (-)ve integer as defined in errno.h
+ *  file on failure.
+ */
+static int stmmac_hw_setup(struct net_device *dev)
+{
+       struct stmmac_priv *priv = netdev_priv(dev);
+       int ret;
+
+       ret = init_dma_desc_rings(dev);
+       if (ret < 0) {
+               pr_err("%s: DMA descriptors initialization failed\n", __func__);
+               return ret;
+       }
+       /* DMA initialization and SW reset */
+       ret = stmmac_init_dma_engine(priv);
+       if (ret < 0) {
+               pr_err("%s: DMA engine initialization failed\n", __func__);
+               return ret;
+       }
+
+       /* Copy the MAC addr into the HW  */
+       priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0);
+
+       /* If required, perform hw setup of the bus. */
+       if (priv->plat->bus_setup)
+               priv->plat->bus_setup(priv->ioaddr);
+
+       /* Initialize the MAC Core */
+       priv->hw->mac->core_init(priv->ioaddr);
+
+       /* Enable the MAC Rx/Tx */
+       stmmac_set_mac(priv->ioaddr, true);
+
+       /* Set the HW DMA mode and the COE */
+       stmmac_dma_operation_mode(priv);
+
+       stmmac_mmc_setup(priv);
+
+       ret = stmmac_init_ptp(priv);
+       if (ret)
+               pr_warn("%s: failed PTP initialisation\n", __func__);
+
+#ifdef CONFIG_STMMAC_DEBUG_FS
+       ret = stmmac_init_fs(dev);
+       if (ret < 0)
+               pr_warn("%s: failed debugFS registration\n", __func__);
+#endif
+       /* Start the ball rolling... */
+       pr_debug("%s: DMA RX/TX processes started...\n", dev->name);
+       priv->hw->dma->start_tx(priv->ioaddr);
+       priv->hw->dma->start_rx(priv->ioaddr);
+
+       /* Dump DMA/MAC registers */
+       if (netif_msg_hw(priv)) {
+               priv->hw->mac->dump_regs(priv->ioaddr);
+               priv->hw->dma->dump_regs(priv->ioaddr);
+       }
+       priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
+
+       priv->eee_enabled = stmmac_eee_init(priv);
+
+       stmmac_init_tx_coalesce(priv);
+
+       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);
+       }
+
+       if (priv->pcs && priv->hw->mac->ctrl_ane)
+               priv->hw->mac->ctrl_ane(priv->ioaddr, 0);
+
+       return 0;
+}
+
 /**
  *  stmmac_open - open entry point of the driver
  *  @dev : pointer to the device structure.
@@ -1613,6 +1693,10 @@ static int stmmac_open(struct net_device *dev)
                }
        }
 
+       /* Extra statistics */
+       memset(&priv->xstats, 0, sizeof(struct stmmac_extra_stats));
+       priv->xstats.threshold = tc;
+
        /* Create and initialize the TX/RX descriptors chains. */
        priv->dma_tx_size = STMMAC_ALIGN(dma_txsize);
        priv->dma_rx_size = STMMAC_ALIGN(dma_rxsize);
@@ -1624,28 +1708,14 @@ static int stmmac_open(struct net_device *dev)
                goto dma_desc_error;
        }
 
-       ret = init_dma_desc_rings(dev);
+       ret = stmmac_hw_setup(dev);
        if (ret < 0) {
-               pr_err("%s: DMA descriptors initialization failed\n", __func__);
-               goto dma_desc_error;
-       }
-
-       /* DMA initialization and SW reset */
-       ret = stmmac_init_dma_engine(priv);
-       if (ret < 0) {
-               pr_err("%s: DMA engine initialization failed\n", __func__);
+               pr_err("%s: Hw setup failed\n", __func__);
                goto init_error;
        }
 
-       /* Copy the MAC addr into the HW  */
-       priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0);
-
-       /* If required, perform hw setup of the bus. */
-       if (priv->plat->bus_setup)
-               priv->plat->bus_setup(priv->ioaddr);
-
-       /* Initialize the MAC Core */
-       priv->hw->mac->core_init(priv->ioaddr);
+       if (priv->phydev)
+               phy_start(priv->phydev);
 
        /* Request the IRQ lines */
        ret = request_irq(dev->irq, stmmac_interrupt,
@@ -1678,55 +1748,6 @@ static int stmmac_open(struct net_device *dev)
                }
        }
 
-       /* Enable the MAC Rx/Tx */
-       stmmac_set_mac(priv->ioaddr, true);
-
-       /* Set the HW DMA mode and the COE */
-       stmmac_dma_operation_mode(priv);
-
-       /* Extra statistics */
-       memset(&priv->xstats, 0, sizeof(struct stmmac_extra_stats));
-       priv->xstats.threshold = tc;
-
-       stmmac_mmc_setup(priv);
-
-       ret = stmmac_init_ptp(priv);
-       if (ret)
-               pr_warn("%s: failed PTP initialisation\n", __func__);
-
-#ifdef CONFIG_STMMAC_DEBUG_FS
-       ret = stmmac_init_fs(dev);
-       if (ret < 0)
-               pr_warn("%s: failed debugFS registration\n", __func__);
-#endif
-       /* Start the ball rolling... */
-       pr_debug("%s: DMA RX/TX processes started...\n", dev->name);
-       priv->hw->dma->start_tx(priv->ioaddr);
-       priv->hw->dma->start_rx(priv->ioaddr);
-
-       /* Dump DMA/MAC registers */
-       if (netif_msg_hw(priv)) {
-               priv->hw->mac->dump_regs(priv->ioaddr);
-               priv->hw->dma->dump_regs(priv->ioaddr);
-       }
-
-       if (priv->phydev)
-               phy_start(priv->phydev);
-
-       priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
-
-       priv->eee_enabled = stmmac_eee_init(priv);
-
-       stmmac_init_tx_coalesce(priv);
-
-       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);
-       }
-
-       if (priv->pcs && priv->hw->mac->ctrl_ane)
-               priv->hw->mac->ctrl_ane(priv->ioaddr, 0);
-
        napi_enable(&priv->napi);
        netif_start_queue(dev);