diff options
Diffstat (limited to 'target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c')
| -rw-r--r-- | target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c | 1188 |
1 files changed, 1188 insertions, 0 deletions
diff --git a/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c b/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c new file mode 100644 index 000000000..fe95ea7f7 --- /dev/null +++ b/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c @@ -0,0 +1,1188 @@ +/* + * Moschip MCS8140 Ethernet MAC driver + * + * Copyright (C) 2003, Moschip Semiconductors + * Copyright (C) 2012, Florian Fainelli <florian@openwrt.org> + * + * Licensed under GPLv2 + */ +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/delay.h> +#include <linux/ethtool.h> +#include <linux/mii.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/irq.h> +#include <linux/err.h> +#include <linux/phy.h> +#include <linux/clk.h> +#include <linux/dma-mapping.h> + +#include <asm/unaligned.h> +#include <asm/sizes.h> + +/* Hardware registers */ +#define MAC_BASE_ADDR ((priv->mac_base)) + +#define CTRL_REG (MAC_BASE_ADDR) +#define MII_BUSY (1 << 0) +#define MII_WRITE (1 << 1) +#define RX_ENABLE (1 << 2) +#define TX_ENABLE (1 << 3) +#define DEFER_CHECK (1 << 5) +#define STRIP_PAD (1 << 8) +#define DRTRY_DISABLE (1 << 10) +#define FULL_DUPLEX (1 << 20) +#define HBD_DISABLE (1 << 28) +#define MAC_ADDR_HIGH_REG (MAC_BASE_ADDR + 0x04) +#define MAC_ADDR_LOW_REG (MAC_BASE_ADDR + 0x08) +#define MII_ADDR_REG (MAC_BASE_ADDR + 0x14) +#define MII_ADDR_SHIFT (11) +#define MII_REG_SHIFT (6) +#define MII_DATA_REG (MAC_BASE_ADDR + 0x18) +/* Link interrupt registers */ +#define LINK_INT_CSR (MAC_BASE_ADDR + 0xD0) +#define LINK_INT_EN (1 << 0) +#define LINK_PHY_ADDR_SHIFT (1) +#define LINK_PHY_REG_SHIFT (6) +#define LINK_BIT_UP_SHIFT (11) +#define LINK_UP (1 << 16) +#define LINK_INT_POLL_TIME (MAC_BASE_ADDR + 0xD4) +#define LINK_POLL_MASK ((1 << 20) - 1) + +#define DMA_CHAN_WIDTH 32 +#define DMA_RX_CHAN 0 +#define DMA_TX_CHAN 2 + +/* Receive DMA registers */ +#define RX_DMA_BASE ((priv->dma_base) + \ + (DMA_CHAN_WIDTH * DMA_RX_CHAN)) +#define RX_BUFFER_ADDR (RX_DMA_BASE + 0x00) +#define RX_MAX_BYTES (RX_DMA_BASE + 0x04) +#define RX_ACT_BYTES (RX_DMA_BASE + 0x08) +#define RX_START_DMA (RX_DMA_BASE + 0x0C) +#define RX_DMA_ENABLE (1 << 0) +#define RX_DMA_RESET (1 << 1) +#define RX_DMA_STATUS_FIFO (1 << 12) +#define RX_DMA_ENH (RX_DMA_BASE + 0x14) +#define RX_DMA_INT_ENABLE (1 << 1) + +/* Transmit DMA registers */ +#define TX_DMA_BASE ((priv->dma_base) + \ + (DMA_CHAN_WIDTH * DMA_TX_CHAN)) +#define TX_BUFFER_ADDR (TX_DMA_BASE + 0x00) +#define TX_PKT_BYTES (TX_DMA_BASE + 0x04) +#define TX_BYTES_SENT (TX_DMA_BASE + 0x08) +#define TX_START_DMA (TX_DMA_BASE + 0x0C) +#define TX_DMA_ENABLE (1 << 0) +#define TX_DMA_START_FRAME (1 << 2) +#define TX_DMA_END_FRAME (1 << 3) +#define TX_DMA_PAD_DISABLE (1 << 8) +#define TX_DMA_CRC_DISABLE (1 << 9) +#define TX_DMA_FIFO_FULL (1 << 16) +#define TX_DMA_FIFO_EMPTY (1 << 17) +#define TX_DMA_STATUS_AVAIL (1 << 18) +#define TX_DMA_RESET (1 << 24) +#define TX_DMA_STATUS (TX_DMA_BASE + 0x10) +#define TX_DMA_ENH (TX_DMA_BASE + 0x14) +#define TX_DMA_ENH_ENABLE (1 << 0) +#define TX_DMA_INT_FIFO (1 << 1) + +#define RX_ALLOC_SIZE SZ_2K +#define MAX_ETH_FRAME_SIZE 1536 +#define RX_SKB_TAILROOM 128 +#define RX_SKB_HEADROOM (RX_ALLOC_SIZE - \ + (MAX_ETH_FRAME_SIZE + RX_SKB_TAILROOM) + 0) + + /* WDT Late COL Lenght COL Type */ +#define ERROR_FILTER_MASK ((1<<14) | (1<<15) | (1<<16) | (1<<17) | (0<<18) | \ + /* MII Dribbling CRC Len/type Control */\ + (1<<19) | (1<<20) | (1<<21) | (0<<24) | (1<<25) | \ + /* Unsup Missed */\ + (1<<26) | (0<<31)) +#define TX_RING_SIZE 30 +#define RX_RING_SIZE 30 + +static inline u32 nuport_mac_readl(void __iomem *reg) +{ + return readl_relaxed(reg); +} + +static inline u8 nuport_mac_readb(void __iomem *reg) +{ + return readb_relaxed(reg); +} + +static inline void nuport_mac_writel(u32 value, void __iomem *reg) +{ + writel_relaxed(value, reg); +} + +static inline void nuport_mac_writeb(u8 value, void __iomem *reg) +{ + writel_relaxed(value, reg); +} + +/* MAC private data */ +struct nuport_mac_priv { + spinlock_t lock; + + void __iomem *mac_base; + void __iomem *dma_base; + + int rx_irq; + int tx_irq; + int link_irq; + struct clk *emac_clk; + struct clk *ephy_clk; + + /* Transmit buffers */ + struct sk_buff *tx_skb[TX_RING_SIZE]; + dma_addr_t tx_addr; + unsigned int valid_txskb[TX_RING_SIZE]; + unsigned int cur_tx; + unsigned int dma_tx; + unsigned int tx_full; + + /* Receive buffers */ + struct sk_buff *rx_skb[RX_RING_SIZE]; + dma_addr_t rx_addr; + unsigned int irq_rxskb[RX_RING_SIZE]; + int pkt_len[RX_RING_SIZE]; + unsigned int cur_rx; + unsigned int dma_rx; + unsigned int rx_full; + + unsigned int first_pkt; + + /* Private data */ + struct napi_struct napi; + struct net_device *dev; + struct platform_device *pdev; + struct mii_bus *mii_bus; + struct phy_device *phydev; + int old_link; + int old_duplex; + u32 msg_level; + unsigned int buffer_shifting_len; +}; + +static inline int nuport_mac_mii_busy_wait(struct nuport_mac_priv *priv) +{ + unsigned long curr; + unsigned long finish = jiffies + 3 * HZ; + + do { + curr = jiffies; + if (!(nuport_mac_readl(MII_ADDR_REG) & MII_BUSY)) + return 0; + cpu_relax(); + } while (!time_after_eq(curr, finish)); + + return -EBUSY; +} + +/* Read from PHY registers */ +static int nuport_mac_mii_read(struct mii_bus *bus, + int mii_id, int regnum) +{ + struct net_device *dev = bus->priv; + struct nuport_mac_priv *priv = netdev_priv(dev); + int ret; + u32 val = 0; + + ret = nuport_mac_mii_busy_wait(priv); + if (ret) + return ret; + + val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT) | MII_BUSY; + nuport_mac_writel(val, MII_ADDR_REG); + ret = nuport_mac_mii_busy_wait(priv); + if (ret) + return ret; + + return nuport_mac_readl(MII_DATA_REG); +} + +static int nuport_mac_mii_write(struct mii_bus *bus, int mii_id, + int regnum, u16 value) +{ + struct net_device *dev = bus->priv; + struct nuport_mac_priv *priv = netdev_priv(dev); + int ret; + u32 val = 0; + + ret = nuport_mac_mii_busy_wait(priv); + if (ret) + return ret; + + val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT); + val |= MII_BUSY | MII_WRITE; + nuport_mac_writel(value, MII_DATA_REG); + nuport_mac_writel(val, MII_ADDR_REG); + + return nuport_mac_mii_busy_wait(priv); +} + +static int nuport_mac_mii_reset(struct mii_bus *bus) +{ + return 0; +} + +static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv, + struct sk_buff *skb) +{ + u32 reg; + unsigned int timeout = 2048; + + while (timeout--) { + reg = nuport_mac_readl(TX_START_DMA); + if (!(reg & TX_DMA_ENABLE)) { + netdev_dbg(priv->dev, "dma ready\n"); + break; + } + cpu_relax(); + } + + if (!timeout) + return -EBUSY; + + priv->tx_addr = dma_map_single(&priv->pdev->dev, skb->data, + skb->len, DMA_TO_DEVICE); + if (dma_mapping_error(&priv->pdev->dev, priv->tx_addr)) + return -ENOMEM; + + /* enable enhanced mode */ + nuport_mac_writel(TX_DMA_ENH_ENABLE, TX_DMA_ENH); + nuport_mac_writel(priv->tx_addr, TX_BUFFER_ADDR); + nuport_mac_writel((skb->len) - 1, TX_PKT_BYTES); + wmb(); + reg = TX_DMA_ENABLE | TX_DMA_START_FRAME | TX_DMA_END_FRAME; + nuport_mac_writel(reg, TX_START_DMA); + + return 0; +} + +static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv) +{ + u32 reg; + + reg = nuport_mac_readl(TX_START_DMA); + reg |= TX_DMA_RESET; + nuport_mac_writel(reg, TX_START_DMA); +} + +static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv, + struct sk_buff *skb) +{ + u32 reg; + unsigned int timeout = 2048; + + while (timeout--) { + reg = nuport_mac_readl(RX_START_DMA); + if (!(reg & RX_DMA_ENABLE)) { + netdev_dbg(priv->dev, "dma ready\n"); + break; + } + cpu_relax(); + } + + if (!timeout) + return -EBUSY; + + priv->rx_addr = dma_map_single(&priv->pdev->dev, skb->data, + RX_ALLOC_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(&priv->pdev->dev, priv->rx_addr)) + return -ENOMEM; + + nuport_mac_writel(priv->rx_addr, RX_BUFFER_ADDR); + wmb(); + nuport_mac_writel(RX_DMA_ENABLE, RX_START_DMA); + + return 0; +} + +static void nuport_mac_reset_rx_dma(struct nuport_mac_priv *priv) +{ + u32 reg; + + reg = nuport_mac_readl(RX_START_DMA); + reg |= RX_DMA_RESET; + nuport_mac_writel(reg, RX_START_DMA); +} + +/* I suppose this might do something, but I am not sure actually */ +static void nuport_mac_disable_rx_dma(struct nuport_mac_priv *priv) +{ + u32 reg; + + reg = nuport_mac_readl(RX_DMA_ENH); + reg &= ~RX_DMA_INT_ENABLE; + nuport_mac_writel(reg, RX_DMA_ENH); +} + +static void nuport_mac_enable_rx_dma(struct nuport_mac_priv *priv) +{ + u32 reg; + + reg = nuport_mac_readl(RX_DMA_ENH); + reg |= RX_DMA_INT_ENABLE; + nuport_mac_writel(reg, RX_DMA_ENH); +} + +/* Add packets to the transmit queue */ +static int nuport_mac_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + unsigned long flags; + struct nuport_mac_priv *priv = netdev_priv(dev); + int ret; + + if (netif_queue_stopped(dev)) { + netdev_warn(dev, "netif queue was stopped, restarting\n"); + netif_start_queue(dev); + } + + spin_lock_irqsave(&priv->lock, flags); + if (priv->first_pkt) { + ret = nuport_mac_start_tx_dma(priv, skb); + if (ret) { + netif_stop_queue(dev); + spin_unlock_irqrestore(&priv->lock, flags); + netdev_err(dev, "transmit path busy\n"); + return NETDEV_TX_BUSY; + } + priv->first_pkt = 0; + } + + priv->tx_skb[priv->cur_tx] = skb; + dev->stats.tx_bytes += skb->len; + dev->stats.tx_packets++; + priv->valid_txskb[priv->cur_tx] = 1; + priv->cur_tx++; + dev->trans_start = jiffies; + + if (priv->cur_tx >= TX_RING_SIZE) + priv->cur_tx = 0; + + spin_unlock_irqrestore(&priv->lock, flags); + + if (priv->valid_txskb[priv->cur_tx]) { + priv->tx_full = 1; + netdev_err(dev, "stopping queue\n"); + netif_stop_queue(dev); + } + + return NETDEV_TX_OK; +} + +static void nuport_mac_adjust_link(struct net_device *dev) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + struct phy_device *phydev = priv->phydev; + unsigned int status_changed = 0; + u32 reg; + + BUG_ON(!phydev); + + if (priv->old_link != phydev->link) { + status_changed = 1; + priv->old_link = phydev->link; + } + + if (phydev->link & (priv->old_duplex != phydev->duplex)) { + reg = nuport_mac_readl(CTRL_REG); + if (phydev->duplex == DUPLEX_FULL) + reg |= DUPLEX_FULL; + else + reg &= ~DUPLEX_FULL; + nuport_mac_writel(reg, CTRL_REG); + + status_changed = 1; + priv->old_duplex = phydev->duplex; + } + + if (!status_changed) + return; + + pr_info("%s: link %s", dev->name, phydev->link ? + "UP" : "DOWN"); + if (phydev->link) { + pr_cont(" - %d/%s", phydev->speed, + phydev->duplex == DUPLEX_FULL ? "full" : "half"); + } + pr_cont("\n"); +} + +static irqreturn_t nuport_mac_link_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = dev_id; + struct nuport_mac_priv *priv = netdev_priv(dev); + u32 reg; + u8 phy_addr; + unsigned long flags; + irqreturn_t ret = IRQ_HANDLED; + + spin_lock_irqsave(&priv->lock, flags); + reg = nuport_mac_readl(LINK_INT_CSR); + phy_addr = (reg >> LINK_PHY_ADDR_SHIFT) & (PHY_MAX_ADDR - 1); + + if (phy_addr != priv->phydev->addr) { + netdev_err(dev, "spurious PHY irq (phy: %d)\n", phy_addr); + ret = IRQ_NONE; + goto out; + } + + priv->phydev->link = (reg & LINK_UP); + nuport_mac_adjust_link(dev); + +out: + spin_unlock_irqrestore(&priv->lock, flags); + return ret; +} + +static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = (struct net_device *)dev_id; + struct nuport_mac_priv *priv = netdev_priv(dev); + struct sk_buff *skb; + unsigned long flags; + int ret; + u32 reg; + + spin_lock_irqsave(&priv->lock, flags); + /* clear status word available if ready */ + reg = nuport_mac_readl(TX_START_DMA); + if (reg & TX_DMA_STATUS_AVAIL) { + nuport_mac_writel(reg, TX_START_DMA); + reg = nuport_mac_readl(TX_DMA_STATUS); + + if (reg & 1) + dev->stats.tx_errors++; + } else + netdev_dbg(dev, "no status word: %08x\n", reg); + + skb = priv->tx_skb[priv->dma_tx]; + priv->tx_skb[priv->dma_tx] = NULL; + priv->valid_txskb[priv->dma_tx] = 0; + dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len, + DMA_TO_DEVICE); + dev_kfree_skb_irq(skb); + + priv->dma_tx++; + if (priv->dma_tx >= TX_RING_SIZE) + priv->dma_tx = 0; + + if (!priv->valid_txskb[priv->dma_tx]) + priv->first_pkt = 1; + else { + ret = nuport_mac_start_tx_dma(priv, priv->tx_skb[priv->dma_tx]); + if (ret) + netdev_err(dev, "failed to restart TX dma\n"); + } + + if (priv->tx_full) { + netdev_dbg(dev, "restarting transmit queue\n"); + netif_wake_queue(dev); + priv->tx_full = 0; + } + + spin_unlock_irqrestore(&priv->lock, flags); + + return IRQ_HANDLED; +} + +static unsigned int nuport_mac_has_work(struct nuport_mac_priv *priv) +{ + unsigned int i; + + for (i = 0; i < RX_RING_SIZE; i++) + if (priv->rx_skb[i]) + return 1; + + return 0; +} + +static irqreturn_t nuport_mac_rx_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = (struct net_device *)dev_id; + struct nuport_mac_priv *priv = netdev_priv(dev); + unsigned long flags; + int ret; + + spin_lock_irqsave(&priv->lock, flags); + if (!priv->rx_full) { + priv->pkt_len[priv->dma_rx] = nuport_mac_readl(RX_ACT_BYTES) - 4; + priv->irq_rxskb[priv->dma_rx] = 0; + priv->dma_rx++; + + if (priv->dma_rx >= RX_RING_SIZE) + priv->dma_rx = 0; + } else + priv->rx_full = 0; + + if (priv->irq_rxskb[priv->dma_rx] == 1) { + ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[priv->dma_rx]); + if (ret) + netdev_err(dev, "failed to start rx dma\n"); + } else { + priv->rx_full = 1; + netdev_dbg(dev, "RX ring full\n"); + } + + if (likely(nuport_mac_has_work(priv))) { + /* find a way to disable DMA rx irq */ + nuport_mac_disable_rx_dma(priv); + napi_schedule(&priv->napi); + } + spin_unlock_irqrestore(&priv->lock, flags); + + return IRQ_HANDLED; +} + +/* Process received packets in tasklet */ +static int nuport_mac_rx(struct net_device *dev, int limit) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + struct sk_buff *skb; + int len, status; + int count = 0; + + while (count < limit && !priv->irq_rxskb[priv->cur_rx]) { + skb = priv->rx_skb[priv->cur_rx]; + len = priv->pkt_len[priv->cur_rx]; + + /* Remove 2 bytes added by RX buffer shifting */ + len = len - priv->buffer_shifting_len; + skb->data = skb->data + priv->buffer_shifting_len; + + /* Get packet status */ + status = get_unaligned((u32 *) (skb->data + len)); + skb->dev = dev; + + dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len, + DMA_FROM_DEVICE); + + /* packet filter failed */ + if (!(status & (1 << 30))) { + dev_kfree_skb_irq(skb); + goto exit; + } + + /* missed frame */ + if (status & (1 << 31)) { + dev->stats.rx_missed_errors++; + dev_kfree_skb_irq(skb); + goto exit; + } + + /* Not ethernet type */ + if ((!(status & (1 << 18))) || (status & ERROR_FILTER_MASK)) + dev->stats.rx_errors++; + + if (len > MAX_ETH_FRAME_SIZE) { + dev_kfree_skb_irq(skb); + goto exit; + } else + skb_put(skb, len); + + skb->protocol = eth_type_trans(skb, dev); + dev->stats.rx_packets++; + + if (status & (1 << 29)) + skb->pkt_type = PACKET_OTHERHOST; + if (status & (1 << 27)) + skb->pkt_type = PACKET_MULTICAST; + if (status & (1 << 28)) + skb->pkt_type = PACKET_BROADCAST; + + skb->ip_summed = CHECKSUM_UNNECESSARY; + + /* Pass the received packet to network layer */ + status = netif_receive_skb(skb); + if (status != NET_RX_DROP) + dev->stats.rx_bytes += len - 4; /* Without CRC */ + else + dev->stats.rx_dropped++; + + dev->last_rx = jiffies; + +exit: + skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE); + skb_reserve(skb, RX_SKB_HEADROOM); + priv->rx_skb[priv->cur_rx] = skb; + priv->irq_rxskb[priv->cur_rx] = 1; + priv->cur_rx++; + + if (priv->cur_rx >= RX_RING_SIZE) + priv->cur_rx = 0; + count++; + } + + return count; +} + +static int nuport_mac_poll(struct napi_struct *napi, int budget) +{ + struct nuport_mac_priv *priv = + container_of(napi, struct nuport_mac_priv, napi); + struct net_device *dev = priv->dev; + int work_done; + + work_done = nuport_mac_rx(dev, budget); + + if (work_done < budget) { + napi_complete(napi); + nuport_mac_enable_rx_dma(priv); + } + + return work_done; +} + +static void nuport_mac_init_tx_ring(struct nuport_mac_priv *priv) +{ + int i; + + priv->cur_tx = priv->dma_tx = priv->tx_full = 0; + for (i = 0; i < TX_RING_SIZE; i++) { + priv->tx_skb[i] = NULL; + priv->valid_txskb[i] = 0; + } + priv->first_pkt = 1; +} + +static int nuport_mac_init_rx_ring(struct net_device *dev) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + struct sk_buff *skb; + int i; + + priv->cur_rx = priv->dma_rx = priv->rx_full = 0; + + for (i = 0; i < RX_RING_SIZE; i++) { + skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE); + if (!skb) + return -ENOMEM; + skb_reserve(skb, RX_SKB_HEADROOM); + priv->rx_skb[i] = skb; + priv->irq_rxskb[i] = 1; + } + + return 0; +} + +static void nuport_mac_free_rx_ring(struct nuport_mac_priv *priv) +{ + int i; + + for (i = 0; i < RX_RING_SIZE; i++) { + if (!priv->rx_skb[i]) + continue; + + dev_kfree_skb(priv->rx_skb[i]); + priv->rx_skb[i] = NULL; + } + + if (priv->rx_addr) + dma_unmap_single(&priv->pdev->dev, priv->rx_addr, RX_ALLOC_SIZE, + DMA_TO_DEVICE); +} + +static void nuport_mac_read_mac_address(struct net_device *dev) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + int i; + + for (i = 0; i < 4; i++) + dev->dev_addr[i] = nuport_mac_readb(MAC_ADDR_LOW_REG + i); + dev->dev_addr[4] = nuport_mac_readb(MAC_ADDR_HIGH_REG); + dev->dev_addr[5] = nuport_mac_readb(MAC_ADDR_HIGH_REG + 1); + + if (!is_valid_ether_addr(dev->dev_addr)) { + dev_info(&priv->pdev->dev, "using random address\n"); + random_ether_addr(dev->dev_addr); + } +} + +static int nuport_mac_change_mac_address(struct net_device *dev, void *mac_addr) +{ + struct sockaddr *addr = mac_addr; + struct nuport_mac_priv *priv = netdev_priv(dev); + unsigned long *temp = (unsigned long *)dev->dev_addr; + u32 high, low; + + if (netif_running(dev)) + return -EBUSY; + + memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); + + spin_lock_irq(&priv->lock); + + nuport_mac_writel(*temp, MAC_ADDR_LOW_REG); + temp = (unsigned long *)(dev->dev_addr + 4); + nuport_mac_writel(*temp, MAC_ADDR_HIGH_REG); + + low = nuport_mac_readl(MAC_ADDR_LOW_REG); + high = nuport_mac_readl(MAC_ADDR_HIGH_REG); + + spin_unlock_irq(&priv->lock); + + return 0; +} + +static int nuport_mac_open(struct net_device *dev) +{ + int ret; + struct nuport_mac_priv *priv = netdev_priv(dev); + unsigned long flags; + u32 reg = 0; + + ret = clk_enable(priv->emac_clk); + if (ret) { + netdev_err(dev, "failed to enable EMAC clock\n"); + return ret; + } + + /* Set MAC into full duplex mode by default */ + reg |= RX_ENABLE | TX_ENABLE; + reg |= DEFER_CHECK | STRIP_PAD | DRTRY_DISABLE; + reg |= FULL_DUPLEX | HBD_DISABLE; + nuport_mac_writel(reg, CTRL_REG); + + /* set mac address in hardware in case it was not already */ + nuport_mac_change_mac_address(dev, dev->dev_addr); + + ret = request_irq(priv->link_irq, &nuport_mac_link_interrupt, + 0, dev->name, dev); + if (ret) { + netdev_err(dev, "unable to request link interrupt\n"); + goto out_emac_clk; + } + + ret = request_irq(priv->tx_irq, &nuport_mac_tx_interrupt, + 0, dev->name, dev); + if (ret) { + netdev_err(dev, "unable to request rx interrupt\n"); + goto out_link_irq; + } + + /* Enable link interrupt monitoring for our PHY address */ + reg = LINK_INT_EN | (priv->phydev->addr << LINK_PHY_ADDR_SHIFT); + /* MII_BMSR register to be watched */ + reg |= (1 << LINK_PHY_REG_SHIFT); + /* BMSR_STATUS to be watched in particular */ + reg |= (2 << LINK_BIT_UP_SHIFT); + + spin_lock_irqsave(&priv->lock, flags); + nuport_mac_writel(reg, LINK_INT_CSR); + nuport_mac_writel(LINK_POLL_MASK, LINK_INT_POLL_TIME); + spin_unlock_irqrestore(&priv->lock, flags); + + phy_start(priv->phydev); + + ret = request_irq(priv->rx_irq, &nuport_mac_rx_interrupt, + 0, dev->name, dev); + if (ret) { + netdev_err(dev, "unable to request tx interrupt\n"); + goto out_tx_irq; + } + + netif_start_queue(dev); + + nuport_mac_init_tx_ring(priv); + + ret = nuport_mac_init_rx_ring(dev); + if (ret) { + netdev_err(dev, "rx ring init failed\n"); + goto out_rx_skb; + } + + nuport_mac_reset_tx_dma(priv); + nuport_mac_reset_rx_dma(priv); + + /* Start RX DMA */ + spin_lock_irqsave(&priv->lock, flags); + ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[0]); + spin_unlock_irqrestore(&priv->lock, flags); + + napi_enable(&priv->napi); + + return ret; + +out_rx_skb: + nuport_mac_free_rx_ring(priv); + free_irq(priv->rx_irq, dev); +out_tx_irq: + free_irq(priv->tx_irq, dev); +out_link_irq: + free_irq(priv->link_irq, dev); +out_emac_clk: + clk_disable(priv->emac_clk); + return ret; +} + +static int nuport_mac_close(struct net_device *dev) +{ + u32 reg; + struct nuport_mac_priv *priv = netdev_priv(dev); + + spin_lock_irq(&priv->lock); + reg = nuport_mac_readl(CTRL_REG); + reg &= ~(RX_ENABLE | TX_ENABLE); + nuport_mac_writel(reg, CTRL_REG); + + napi_disable(&priv->napi); + netif_stop_queue(dev); + + free_irq(priv->link_irq, dev); + /* disable PHY polling */ + nuport_mac_writel(0, LINK_INT_CSR); + nuport_mac_writel(0, LINK_INT_POLL_TIME); + phy_stop(priv->phydev); + + free_irq(priv->tx_irq, dev); + free_irq(priv->rx_irq, dev); + spin_unlock_irq(&priv->lock); + + nuport_mac_free_rx_ring(priv); + + clk_disable(priv->emac_clk); + + return 0; +} + +static void nuport_mac_tx_timeout(struct net_device *dev) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + unsigned int i; + + netdev_warn(dev, "transmit timeout, attempting recovery\n"); + + netdev_info(dev, "TX DMA regs\n"); + for (i = 0; i < DMA_CHAN_WIDTH; i += 4) + netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(TX_DMA_BASE + i)); + netdev_info(dev, "RX DMA regs\n"); + for (i = 0; i < DMA_CHAN_WIDTH; i += 4) + netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(RX_DMA_BASE + i)); + + nuport_mac_init_tx_ring(priv); + nuport_mac_reset_tx_dma(priv); + + netif_wake_queue(dev); +} + +static int nuport_mac_mii_probe(struct net_device *dev) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + struct phy_device *phydev = NULL; + int ret; + + ret = clk_enable(priv->ephy_clk); + if (ret) { + netdev_err(dev, "unable to enable ePHY clk\n"); + return ret; + } + + phydev = phy_find_first(priv->mii_bus); + if (!phydev) { + netdev_err(dev, "no PHYs found\n"); + ret = -ENODEV; + goto out; + } + + phydev = phy_connect(dev, dev_name(&phydev->dev), + nuport_mac_adjust_link, 0, + PHY_INTERFACE_MODE_MII); + if (IS_ERR(phydev)) { + netdev_err(dev, "could not attach PHY\n"); + ret = PTR_ERR(phydev); + goto out; + } + + phydev->supported &= PHY_BASIC_FEATURES; + phydev->advertising = phydev->supported; + priv->phydev = phydev; + priv->old_link = 1; + priv->old_duplex = DUPLEX_FULL; + + dev_info(&priv->pdev->dev, "attached PHY driver [%s] " + "(mii_bus:phy_addr=%d)\n", + phydev->drv->name, phydev->addr); + + return 0; + +out: + /* disable the Ethernet PHY clock for the moment */ + clk_disable(priv->ephy_clk); + + return ret; +} + +static void nuport_mac_ethtool_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + strncpy(info->driver, "nuport-mac", sizeof(info->driver)); + strncpy(info->version, "0.1", sizeof(info->version)); + strncpy(info->fw_version, "N/A", sizeof(info->fw_version)); + strncpy(info->bus_info, "internal", sizeof(info->bus_info)); + info->n_stats = 0; + info->testinfo_len = 0; + info->regdump_len = 0; + info->eedump_len = 0; +} + +static int nuport_mac_ethtool_get_settings(struct net_device *dev, + struct ethtool_cmd *cmd) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + + if (priv->phydev) + return phy_ethtool_gset(priv->phydev, cmd); + + return -EINVAL; +} + +static int nuport_mac_ethtool_set_settings(struct net_device *dev, + struct ethtool_cmd *cmd) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + + if (priv->phydev) + return phy_ethtool_sset(priv->phydev, cmd); + + return -EINVAL; +} + +static void nuport_mac_set_msglevel(struct net_device *dev, u32 msg_level) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + + priv->msg_level = msg_level; +} + +static u32 nuport_mac_get_msglevel(struct net_device *dev) +{ + struct nuport_mac_priv *priv = netdev_priv(dev); + + return priv->msg_level; +} + +static const struct ethtool_ops nuport_mac_ethtool_ops = { + .get_drvinfo = nuport_mac_ethtool_drvinfo, + .get_link = ethtool_op_get_link, + .get_settings = nuport_mac_ethtool_get_settings, + .set_settings = nuport_mac_ethtool_set_settings, + .set_msglevel = nuport_mac_set_msglevel, + .get_msglevel = nuport_mac_get_msglevel, +}; + +static const struct net_device_ops nuport_mac_ops = { + .ndo_open = nuport_mac_open, + .ndo_stop = nuport_mac_close, + .ndo_start_xmit = nuport_mac_start_xmit, + .ndo_change_mtu = eth_change_mtu, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_mac_address = nuport_mac_change_mac_address, + .ndo_tx_timeout = nuport_mac_tx_timeout, +}; + +static int __init nuport_mac_probe(struct platform_device *pdev) +{ + struct net_device *dev; + struct nuport_mac_priv *priv = NULL; + struct resource *regs, *dma; + int ret = 0; + int rx_irq, tx_irq, link_irq; + int i; + const unsigned int *intspec; + + dev = alloc_etherdev(sizeof(struct nuport_mac_priv)); + if (!dev) { + dev_err(&pdev->dev, "no memory for net_device\n"); + return -ENOMEM; + } + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dma = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!regs || !dma) { + dev_err(&pdev->dev, "failed to get regs resources\n"); + ret = -ENODEV; + goto out; + } + + rx_irq = platform_get_irq(pdev, 0); + tx_irq = platform_get_irq(pdev, 1); + link_irq = platform_get_irq(pdev, 2); + if (rx_irq < 0 || tx_irq < 0 || link_irq < 0) { + ret = -ENODEV; + goto out; + } + + platform_set_drvdata(pdev, dev); + SET_NETDEV_DEV(dev, &pdev->dev); + priv = netdev_priv(dev); + priv->pdev = pdev; + priv->dev = dev; + spin_lock_init(&priv->lock); + + intspec = of_get_property(pdev->dev.of_node, + "nuport-mac,buffer-shifting", NULL); + if (!intspec) + priv->buffer_shifting_len = 0; + else + priv->buffer_shifting_len = 2; + + priv->mac_base = devm_ioremap(&pdev->dev, + regs->start, resource_size(regs)); + if (!priv->mac_base) { + dev_err(&pdev->dev, "failed to remap regs\n"); + ret = -ENOMEM; + goto out_platform; + } + + priv->dma_base = devm_ioremap(&pdev->dev, + dma->start, resource_size(dma)); + if (!priv->dma_base) { + dev_err(&pdev->dev, "failed to remap dma-regs\n"); + ret = -ENOMEM; + goto out_platform; + } + + priv->emac_clk = clk_get(&pdev->dev, "emac"); + if (IS_ERR_OR_NULL(priv->emac_clk)) { + dev_err(&pdev->dev, "failed to get emac clk\n"); + ret = PTR_ERR(priv->emac_clk); + goto out_platform; + } + + priv->ephy_clk = clk_get(&pdev->dev, "ephy"); + if (IS_ERR_OR_NULL(priv->ephy_clk)) { + dev_err(&pdev->dev, "failed to get ephy clk\n"); + ret = PTR_ERR(priv->ephy_clk); + goto out_platform; + } + + priv->link_irq = link_irq; + priv->rx_irq = rx_irq; + priv->tx_irq = tx_irq; + priv->msg_level = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK; + dev->netdev_ops = &nuport_mac_ops; + dev->ethtool_ops = &nuport_mac_ethtool_ops; + dev->watchdog_timeo = HZ; + dev->flags = IFF_BROADCAST; /* Supports Broadcast */ + dev->tx_queue_len = TX_RING_SIZE / 2; + + netif_napi_add(dev, &priv->napi, nuport_mac_poll, 64); + + priv->mii_bus = mdiobus_alloc(); + if (!priv->mii_bus) { + dev_err(&pdev->dev, "mii bus allocation failed\n"); + goto out; + } + + priv->mii_bus->priv = dev; + priv->mii_bus->read = nuport_mac_mii_read; + priv->mii_bus->write = nuport_mac_mii_write; + priv->mii_bus->reset = nuport_mac_mii_reset; + priv->mii_bus->name = "nuport-mac-mii"; + priv->mii_bus->phy_mask = (1 << 0); + snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", pdev->name); + priv->mii_bus->irq = kzalloc(PHY_MAX_ADDR * sizeof(int), GFP_KERNEL); + if (!priv->mii_bus->irq) { + dev_err(&pdev->dev, "failed to allocate mii_bus irqs\n"); + ret = -ENOMEM; + goto out_mdio; + } + + /* We support PHY interrupts routed back to the MAC */ + for (i = 0; i < PHY_MAX_ADDR; i++) + priv->mii_bus->irq[i] = PHY_IGNORE_INTERRUPT; + + ret = mdiobus_register(priv->mii_bus); + if (ret) { + dev_err(&pdev->dev, "failed to register mii_bus\n"); + goto out_mdio_irq; + } + + ret = nuport_mac_mii_probe(dev); + if (ret) { + dev_err(&pdev->dev, "failed to probe MII bus\n"); + goto out_mdio_unregister; + } + + ret = register_netdev(dev); + if (ret) { + dev_err(&pdev->dev, "failed to register net_device\n"); + goto out_mdio_probe; + } + + /* read existing mac address */ + nuport_mac_read_mac_address(dev); + + dev_info(&pdev->dev, "registered (MAC: %pM)\n", dev->dev_addr); + + return ret; + +out_mdio_probe: + phy_disconnect(priv->phydev); +out_mdio_unregister: + mdiobus_unregister(priv->mii_bus); +out_mdio_irq: + kfree(priv->mii_bus->irq); +out_mdio: + mdiobus_free(priv->mii_bus); +out_platform: + platform_set_drvdata(pdev, NULL); +out: + clk_put(priv->ephy_clk); + clk_put(priv->emac_clk); + free_netdev(dev); + platform_set_drvdata(pdev, NULL); + return ret; +} + +static int nuport_mac_remove(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + struct nuport_mac_priv *priv = netdev_priv(dev); + + unregister_netdev(dev); + phy_disconnect(priv->phydev); + mdiobus_unregister(priv->mii_bus); + kfree(priv->mii_bus->irq); + mdiobus_free(priv->mii_bus); + clk_put(priv->ephy_clk); + clk_put(priv->emac_clk); + free_netdev(dev); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct of_device_id nuport_eth_ids[] __initdata = { + {.compatible = "moschip,nuport-mac",}, + { /* sentinel */ }, +}; + +static struct platform_driver nuport_eth_driver = { + .driver = { + .name = "nuport-mac", + .owner = THIS_MODULE, + .of_match_table = nuport_eth_ids, + }, + .probe = nuport_mac_probe, + .remove = __devexit_p(nuport_mac_remove), +}; + +module_platform_driver(nuport_eth_driver); + +MODULE_AUTHOR("Moschip Semiconductors Ltd."); +MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver"); +MODULE_LICENSE("GPL"); |