Blackfin EMAC Driver: code cleanup

 - replace specific "bf537" function or data structure name to "bfin_mac"
 - cleanup bfin_mac_probe with error checking
 - punt set_pin_mux function, call peripheral request/free list functions directly

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 123 insertions, 126 deletions

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 4fec8581bfd7..609748b84e83 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -42,7 +42,7 @@
 #define DRV_NAME        "bfin_mac"
 #define DRV_VERSION     "1.1"
 #define DRV_AUTHOR      "Bryan Wu, Luke Yang"
-#define DRV_DESC        "Blackfin BF53[67] BF527 on-chip Ethernet MAC driver"
+#define DRV_DESC        "Blackfin on-chip Ethernet MAC driver"
 
 MODULE_AUTHOR(DRV_AUTHOR);
 MODULE_LICENSE("GPL");
@@ -73,8 +73,14 @@ static struct net_dma_desc_tx *current_tx_ptr;
 static struct net_dma_desc_tx *tx_desc;
 static struct net_dma_desc_rx *rx_desc;
 
-static void bf537mac_disable(void);
-static void bf537mac_enable(void);
+#if defined(CONFIG_BFIN_MAC_RMII)
+static u16 pin_req[] = P_RMII0;
+#else
+static u16 pin_req[] = P_MII0;
+#endif
+
+static void bfin_mac_disable(void);
+static void bfin_mac_enable(void);
 
 static void desc_list_free(void)
 {
@@ -243,27 +249,6 @@ init_error:
 
 /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
 
-/* Set FER regs to MUX in Ethernet pins */
-static int setup_pin_mux(int action)
-{
-#if defined(CONFIG_BFIN_MAC_RMII)
-        u16 pin_req[] = P_RMII0;
-#else
-        u16 pin_req[] = P_MII0;
-#endif
-
-        if (action) {
-                if (peripheral_request_list(pin_req, DRV_NAME)) {
-                        printk(KERN_ERR DRV_NAME
-                        ": Requesting Peripherals failed\n");
-                        return -EFAULT;
-                }
-        } else
-                peripheral_free_list(pin_req);
-
-        return 0;
-}
-
 /*
  * MII operations
  */
@@ -322,9 +307,9 @@ static int mdiobus_reset(struct mii_bus *bus)
         return 0;
 }
 
-static void bf537_adjust_link(struct net_device *dev)
+static void bfin_mac_adjust_link(struct net_device *dev)
 {
-        struct bf537mac_local *lp = netdev_priv(dev);
+        struct bfin_mac_local *lp = netdev_priv(dev);
         struct phy_device *phydev = lp->phydev;
         unsigned long flags;
         int new_state = 0;
@@ -395,7 +380,7 @@ static void bf537_adjust_link(struct net_device *dev)
 
 static int mii_probe(struct net_device *dev)
 {
-        struct bf537mac_local *lp = netdev_priv(dev);
+        struct bfin_mac_local *lp = netdev_priv(dev);
         struct phy_device *phydev = NULL;
         unsigned short sysctl;
         int i;
@@ -431,10 +416,10 @@ static int mii_probe(struct net_device *dev)
         }
 
 #if defined(CONFIG_BFIN_MAC_RMII)
-        phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
+        phydev = phy_connect(dev, phydev->dev.bus_id, &bfin_mac_adjust_link, 0,
                         PHY_INTERFACE_MODE_RMII);
 #else
-        phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
+        phydev = phy_connect(dev, phydev->dev.bus_id, &bfin_mac_adjust_link, 0,
                         PHY_INTERFACE_MODE_MII);
 #endif
 
@@ -511,7 +496,7 @@ static void setup_mac_addr(u8 *mac_addr)
         bfin_write_EMAC_ADDRHI(addr_hi);
 }
 
-static int bf537mac_set_mac_address(struct net_device *dev, void *p)
+static int bfin_mac_set_mac_address(struct net_device *dev, void *p)
 {
         struct sockaddr *addr = p;
         if (netif_running(dev))
@@ -573,7 +558,7 @@ adjust_head:
 
 }
 
-static int bf537mac_hard_start_xmit(struct sk_buff *skb,
+static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
                                 struct net_device *dev)
 {
         unsigned int data;
@@ -631,7 +616,7 @@ out:
         return 0;
 }
 
-static void bf537mac_rx(struct net_device *dev)
+static void bfin_mac_rx(struct net_device *dev)
 {
         struct sk_buff *skb, *new_skb;
         unsigned short len;
@@ -680,7 +665,7 @@ out:
 }
 
 /* interrupt routine to handle rx and error signal */
-static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
+static irqreturn_t bfin_mac_interrupt(int irq, void *dev_id)
 {
         struct net_device *dev = dev_id;
         int number = 0;
@@ -700,21 +685,21 @@ get_one_packet:
         }
 
 real_rx:
-        bf537mac_rx(dev);
+        bfin_mac_rx(dev);
         number++;
         goto get_one_packet;
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
-static void bf537mac_poll(struct net_device *dev)
+static void bfin_mac_poll(struct net_device *dev)
 {
         disable_irq(IRQ_MAC_RX);
-        bf537mac_interrupt(IRQ_MAC_RX, dev);
+        bfin_mac_interrupt(IRQ_MAC_RX, dev);
         enable_irq(IRQ_MAC_RX);
 }
 #endif                          /* CONFIG_NET_POLL_CONTROLLER */
 
-static void bf537mac_disable(void)
+static void bfin_mac_disable(void)
 {
         unsigned int opmode;
 
@@ -728,7 +713,7 @@ static void bf537mac_disable(void)
 /*
  * Enable Interrupts, Receive, and Transmit
  */
-static void bf537mac_enable(void)
+static void bfin_mac_enable(void)
 {
         u32 opmode;
 
@@ -766,23 +751,23 @@ static void bf537mac_enable(void)
 }
 
 /* Our watchdog timed out. Called by the networking layer */
-static void bf537mac_timeout(struct net_device *dev)
+static void bfin_mac_timeout(struct net_device *dev)
 {
         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 
-        bf537mac_disable();
+        bfin_mac_disable();
 
         /* reset tx queue */
         tx_list_tail = tx_list_head->next;
 
-        bf537mac_enable();
+        bfin_mac_enable();
 
         /* We can accept TX packets again */
         dev->trans_start = jiffies;
         netif_wake_queue(dev);
 }
 
-static void bf537mac_multicast_hash(struct net_device *dev)
+static void bfin_mac_multicast_hash(struct net_device *dev)
 {
         u32 emac_hashhi, emac_hashlo;
         struct dev_mc_list *dmi = dev->mc_list;
@@ -821,7 +806,7 @@ static void bf537mac_multicast_hash(struct net_device *dev)
  * promiscuous mode (for TCPDUMP and cousins) or accept
  * a select set of multicast packets
  */
-static void bf537mac_set_multicast_list(struct net_device *dev)
+static void bfin_mac_set_multicast_list(struct net_device *dev)
 {
         u32 sysctl;
 
@@ -840,7 +825,7 @@ static void bf537mac_set_multicast_list(struct net_device *dev)
                 sysctl = bfin_read_EMAC_OPMODE();
                 sysctl |= HM;
                 bfin_write_EMAC_OPMODE(sysctl);
-                bf537mac_multicast_hash(dev);
+                bfin_mac_multicast_hash(dev);
         } else {
                 /* clear promisc or multicast mode */
                 sysctl = bfin_read_EMAC_OPMODE();
@@ -852,7 +837,7 @@ static void bf537mac_set_multicast_list(struct net_device *dev)
 /*
  * this puts the device in an inactive state
  */
-static void bf537mac_shutdown(struct net_device *dev)
+static void bfin_mac_shutdown(struct net_device *dev)
 {
         /* Turn off the EMAC */
         bfin_write_EMAC_OPMODE(0x00000000);
@@ -866,9 +851,9 @@ static void bf537mac_shutdown(struct net_device *dev)
  *
  * Set up everything, reset the card, etc..
  */
-static int bf537mac_open(struct net_device *dev)
+static int bfin_mac_open(struct net_device *dev)
 {
-        struct bf537mac_local *lp = netdev_priv(dev);
+        struct bfin_mac_local *lp = netdev_priv(dev);
         int retval;
         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 
@@ -891,8 +876,8 @@ static int bf537mac_open(struct net_device *dev)
         phy_start(lp->phydev);
         phy_write(lp->phydev, MII_BMCR, BMCR_RESET);
         setup_system_regs(dev);
-        bf537mac_disable();
-        bf537mac_enable();
+        bfin_mac_disable();
+        bfin_mac_enable();
         pr_debug("hardware init finished\n");
         netif_start_queue(dev);
         netif_carrier_on(dev);
@@ -906,9 +891,9 @@ static int bf537mac_open(struct net_device *dev)
  * and not talk to the outside world.   Caused by
  * an 'ifconfig ethX down'
  */
-static int bf537mac_close(struct net_device *dev)
+static int bfin_mac_close(struct net_device *dev)
 {
-        struct bf537mac_local *lp = netdev_priv(dev);
+        struct bfin_mac_local *lp = netdev_priv(dev);
         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 
         netif_stop_queue(dev);
@@ -918,7 +903,7 @@ static int bf537mac_close(struct net_device *dev)
         phy_write(lp->phydev, MII_BMCR, BMCR_PDOWN);
 
         /* clear everything */
-        bf537mac_shutdown(dev);
+        bfin_mac_shutdown(dev);
 
         /* free the rx/tx buffers */
         desc_list_free();
@@ -926,46 +911,59 @@ static int bf537mac_close(struct net_device *dev)
         return 0;
 }
 
-static int __init bf537mac_probe(struct net_device *dev)
+static int __init bfin_mac_probe(struct platform_device *pdev)
 {
-        struct bf537mac_local *lp = netdev_priv(dev);
-        int retval;
-        int i;
+        struct net_device *ndev;
+        struct bfin_mac_local *lp;
+        int rc, i;
+
+        ndev = alloc_etherdev(sizeof(struct bfin_mac_local));
+        if (!ndev) {
+                dev_err(&pdev->dev, "Cannot allocate net device!\n");
+                return -ENOMEM;
+        }
+
+        SET_NETDEV_DEV(ndev, &pdev->dev);
+        platform_set_drvdata(pdev, ndev);
+        lp = netdev_priv(ndev);
 
         /* Grab the MAC address in the MAC */
-        *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
-        *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
+        *(__le32 *) (&(ndev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
+        *(__le16 *) (&(ndev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
 
         /* probe mac */
         /*todo: how to proble? which is revision_register */
         bfin_write_EMAC_ADDRLO(0x12345678);
         if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
-                pr_debug("can't detect bf537 mac!\n");
-                retval = -ENODEV;
-                goto err_out;
+                dev_err(&pdev->dev, "Cannot detect Blackfin on-chip ethernet MAC controller!\n");
+                rc = -ENODEV;
+                goto out_err_probe_mac;
         }
 
         /* set the GPIO pins to Ethernet mode */
-        retval = setup_pin_mux(1);
-        if (retval)
-                return retval;
-
-        /*Is it valid? (Did bootloader initialize it?) */
-        if (!is_valid_ether_addr(dev->dev_addr)) {
-                /* Grab the MAC from the board somehow - this is done in the
-                   arch/blackfin/mach-bf537/boards/eth_mac.c */
-                bfin_get_ether_addr(dev->dev_addr);
+        rc = peripheral_request_list(pin_req, DRV_NAME);
+        if (rc) {
+                dev_err(&pdev->dev, "Requesting peripherals failed!\n");
+                rc = -EFAULT;
+                goto out_err_setup_pin_mux;
         }
 
+        /*
+         * Is it valid? (Did bootloader initialize it?)
+         * Grab the MAC from the board somehow
+         * this is done in the arch/blackfin/mach-bfxxx/boards/eth_mac.c
+         */
+        if (!is_valid_ether_addr(ndev->dev_addr))
+                bfin_get_ether_addr(ndev->dev_addr);
+
         /* If still not valid, get a random one */
-        if (!is_valid_ether_addr(dev->dev_addr)) {
-                random_ether_addr(dev->dev_addr);
-        }
+        if (!is_valid_ether_addr(ndev->dev_addr))
+                random_ether_addr(ndev->dev_addr);
 
-        setup_mac_addr(dev->dev_addr);
+        setup_mac_addr(ndev->dev_addr);
 
         /* MDIO bus initial */
-        lp->mii_bus.priv = dev;
+        lp->mii_bus.priv = ndev;
         lp->mii_bus.read = mdiobus_read;
         lp->mii_bus.write = mdiobus_write;
         lp->mii_bus.reset = mdiobus_reset;
@@ -975,86 +973,85 @@ static int __init bf537mac_probe(struct net_device *dev)
         for (i = 0; i < PHY_MAX_ADDR; ++i)
                 lp->mii_bus.irq[i] = PHY_POLL;
 
-        mdiobus_register(&lp->mii_bus);
+        rc = mdiobus_register(&lp->mii_bus);
+        if (rc) {
+                dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
+                goto out_err_mdiobus_register;
+        }
 
-        retval = mii_probe(dev);
-        if (retval)
-                return retval;
+        rc = mii_probe(ndev);
+        if (rc) {
+                dev_err(&pdev->dev, "MII Probe failed!\n");
+                goto out_err_mii_probe;
+        }
 
         /* Fill in the fields of the device structure with ethernet values. */
-        ether_setup(dev);
-
-        dev->open = bf537mac_open;
-        dev->stop = bf537mac_close;
-        dev->hard_start_xmit = bf537mac_hard_start_xmit;
-        dev->set_mac_address = bf537mac_set_mac_address;
-        dev->tx_timeout = bf537mac_timeout;
-        dev->set_multicast_list = bf537mac_set_multicast_list;
+        ether_setup(ndev);
+
+        ndev->open = bfin_mac_open;
+        ndev->stop = bfin_mac_close;
+        ndev->hard_start_xmit = bfin_mac_hard_start_xmit;
+        ndev->set_mac_address = bfin_mac_set_mac_address;
+        ndev->tx_timeout = bfin_mac_timeout;
+        ndev->set_multicast_list = bfin_mac_set_multicast_list;
 #ifdef CONFIG_NET_POLL_CONTROLLER
-        dev->poll_controller = bf537mac_poll;
+        ndev->poll_controller = bfin_mac_poll;
 #endif
 
         spin_lock_init(&lp->lock);
 
         /* now, enable interrupts */
         /* register irq handler */
-        if (request_irq
-            (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
-             "EMAC_RX", dev)) {
-                printk(KERN_WARNING DRV_NAME
-                       ": Unable to attach BlackFin MAC RX interrupt\n");
-                return -EBUSY;
+        rc = request_irq(IRQ_MAC_RX, bfin_mac_interrupt,
+                        IRQF_DISABLED | IRQF_SHARED, "EMAC_RX", ndev);
+        if (rc) {
+                dev_err(&pdev->dev, "Cannot request Blackfin MAC RX IRQ!\n");
+                rc = -EBUSY;
+                goto out_err_request_irq;
         }
 
-
-        retval = register_netdev(dev);
-        if (retval == 0) {
-                /* now, print out the card info, in a short format.. */
-                printk(KERN_INFO "%s: Version %s, %s\n",
-                         DRV_NAME, DRV_VERSION, DRV_DESC);
-        }
-
-err_out:
-        return retval;
-}
-
-static int bfin_mac_probe(struct platform_device *pdev)
-{
-        struct net_device *ndev;
-
-        ndev = alloc_etherdev(sizeof(struct bf537mac_local));
-        if (!ndev) {
-                printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
-                return -ENOMEM;
+        rc = register_netdev(ndev);
+        if (rc) {
+                dev_err(&pdev->dev, "Cannot register net device!\n");
+                goto out_err_reg_ndev;
         }
 
-        SET_NETDEV_DEV(ndev, &pdev->dev);
+        /* now, print out the card info, in a short format.. */
+        dev_info(&pdev->dev, "%s, Version %s\n", DRV_DESC, DRV_VERSION);
 
-        platform_set_drvdata(pdev, ndev);
+        return 0;
 
-        if (bf537mac_probe(ndev) != 0) {
-                platform_set_drvdata(pdev, NULL);
-                free_netdev(ndev);
-                printk(KERN_WARNING DRV_NAME ": not found\n");
-                return -ENODEV;
-        }
+out_err_reg_ndev:
+        free_irq(IRQ_MAC_RX, ndev);
+out_err_request_irq:
+out_err_mii_probe:
+        mdiobus_unregister(&lp->mii_bus);
+out_err_mdiobus_register:
+        peripheral_free_list(pin_req);
+out_err_setup_pin_mux:
+out_err_probe_mac:
+        platform_set_drvdata(pdev, NULL);
+        free_netdev(ndev);
 
-        return 0;
+        return rc;
 }
 
 static int bfin_mac_remove(struct platform_device *pdev)
 {
         struct net_device *ndev = platform_get_drvdata(pdev);
+        struct bfin_mac_local *lp = netdev_priv(ndev);
 
         platform_set_drvdata(pdev, NULL);
 
+        mdiobus_unregister(&lp->mii_bus);
+
         unregister_netdev(ndev);
 
         free_irq(IRQ_MAC_RX, ndev);
 
         free_netdev(ndev);
 
-        setup_pin_mux(0);
+        peripheral_free_list(pin_req);
 
         return 0;
 }
@@ -1065,7 +1062,7 @@ static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
         struct net_device *net_dev = platform_get_drvdata(pdev);
 
         if (netif_running(net_dev))
-                bf537mac_close(net_dev);
+                bfin_mac_close(net_dev);
 
         return 0;
 }
@@ -1075,7 +1072,7 @@ static int bfin_mac_resume(struct platform_device *pdev)
         struct net_device *net_dev = platform_get_drvdata(pdev);
 
         if (netif_running(net_dev))
-                bf537mac_open(net_dev);
+                bfin_mac_open(net_dev);
 
         return 0;
 }