+++ /dev/null
-/*
- * 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/of_mdio.h>
-#include <linux/of_net.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;
- struct device_node *phy_node;
- phy_interface_t phy_interface;
- 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));
-
- 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);
- if (!skb)
- goto out;
-
- 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++;
- }
-out:
- 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 = of_phy_connect(dev, priv->phy_node,
- nuport_mac_adjust_link, 0,
- priv->phy_interface);
- 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_request_and_ioremap(&pdev->dev, regs);
- if (!priv->mac_base) {
- dev_err(&pdev->dev, "failed to remap regs\n");
- ret = -ENOMEM;
- goto out_platform;
- }
-
- priv->dma_base = devm_request_and_ioremap(&pdev->dev, 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->phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0);
- if (!priv->phy_node) {
- dev_err(&pdev->dev, "no associated PHY\n");
- ret = -ENODEV;
- goto out;
- }
-
- priv->phy_interface = of_get_phy_mode(pdev->dev.of_node);
- if (priv->phy_interface < 0) {
- dev_err(&pdev->dev, "invalid PHY mode\n");
- ret = -EINVAL;
- goto out;
- }
-
- 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 = of_mdiobus_register(priv->mii_bus, pdev->dev.of_node);
- 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 = nuport_mac_remove,
-};
-
-module_platform_driver(nuport_eth_driver);
-
-MODULE_AUTHOR("Moschip Semiconductors Ltd.");
-MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver");
-MODULE_LICENSE("GPL");
projects / openwrt / svn-archive / archive.git / blobdiff