OpenWrt – Rev 1
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/*
* 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_ioremap_resource(&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_ioremap_resource(&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");