2 * Moschip MCS8140 Ethernet MAC driver
4 * Copyright (C) 2003, Moschip Semiconductors
5 * Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/delay.h>
16 #include <linux/ethtool.h>
17 #include <linux/mii.h>
19 #include <linux/interrupt.h>
20 #include <linux/platform_device.h>
22 #include <linux/irq.h>
23 #include <linux/err.h>
24 #include <linux/phy.h>
25 #include <linux/clk.h>
26 #include <linux/dma-mapping.h>
28 #include <asm/unaligned.h>
29 #include <asm/sizes.h>
31 /* Hardware registers */
32 #define MAC_BASE_ADDR ((priv->mac_base))
34 #define CTRL_REG (MAC_BASE_ADDR)
35 #define MII_BUSY (1 << 0)
36 #define MII_WRITE (1 << 1)
37 #define RX_ENABLE (1 << 2)
38 #define TX_ENABLE (1 << 3)
39 #define DEFER_CHECK (1 << 5)
40 #define STRIP_PAD (1 << 8)
41 #define DRTRY_DISABLE (1 << 10)
42 #define FULL_DUPLEX (1 << 20)
43 #define HBD_DISABLE (1 << 28)
44 #define MAC_ADDR_HIGH_REG (MAC_BASE_ADDR + 0x04)
45 #define MAC_ADDR_LOW_REG (MAC_BASE_ADDR + 0x08)
46 #define MII_ADDR_REG (MAC_BASE_ADDR + 0x14)
47 #define MII_ADDR_SHIFT (11)
48 #define MII_REG_SHIFT (6)
49 #define MII_DATA_REG (MAC_BASE_ADDR + 0x18)
50 /* Link interrupt registers */
51 #define LINK_INT_CSR (MAC_BASE_ADDR + 0xD0)
52 #define LINK_INT_EN (1 << 0)
53 #define LINK_PHY_ADDR_SHIFT (1)
54 #define LINK_PHY_REG_SHIFT (6)
55 #define LINK_BIT_UP_SHIFT (11)
56 #define LINK_UP (1 << 16)
57 #define LINK_INT_POLL_TIME (MAC_BASE_ADDR + 0xD4)
58 #define LINK_POLL_MASK ((1 << 20) - 1)
60 #define DMA_CHAN_WIDTH 32
64 /* Receive DMA registers */
65 #define RX_DMA_BASE ((priv->dma_base) + \
66 (DMA_CHAN_WIDTH * DMA_RX_CHAN))
67 #define RX_BUFFER_ADDR (RX_DMA_BASE + 0x00)
68 #define RX_MAX_BYTES (RX_DMA_BASE + 0x04)
69 #define RX_ACT_BYTES (RX_DMA_BASE + 0x08)
70 #define RX_START_DMA (RX_DMA_BASE + 0x0C)
71 #define RX_DMA_ENABLE (1 << 0)
72 #define RX_DMA_RESET (1 << 1)
73 #define RX_DMA_STATUS_FIFO (1 << 12)
74 #define RX_DMA_ENH (RX_DMA_BASE + 0x14)
75 #define RX_DMA_INT_ENABLE (1 << 1)
77 /* Transmit DMA registers */
78 #define TX_DMA_BASE ((priv->dma_base) + \
79 (DMA_CHAN_WIDTH * DMA_TX_CHAN))
80 #define TX_BUFFER_ADDR (TX_DMA_BASE + 0x00)
81 #define TX_PKT_BYTES (TX_DMA_BASE + 0x04)
82 #define TX_BYTES_SENT (TX_DMA_BASE + 0x08)
83 #define TX_START_DMA (TX_DMA_BASE + 0x0C)
84 #define TX_DMA_ENABLE (1 << 0)
85 #define TX_DMA_START_FRAME (1 << 2)
86 #define TX_DMA_END_FRAME (1 << 3)
87 #define TX_DMA_PAD_DISABLE (1 << 8)
88 #define TX_DMA_CRC_DISABLE (1 << 9)
89 #define TX_DMA_FIFO_FULL (1 << 16)
90 #define TX_DMA_FIFO_EMPTY (1 << 17)
91 #define TX_DMA_STATUS_AVAIL (1 << 18)
92 #define TX_DMA_RESET (1 << 24)
93 #define TX_DMA_STATUS (TX_DMA_BASE + 0x10)
94 #define TX_DMA_ENH (TX_DMA_BASE + 0x14)
95 #define TX_DMA_ENH_ENABLE (1 << 0)
96 #define TX_DMA_INT_FIFO (1 << 1)
98 #define RX_ALLOC_SIZE SZ_2K
99 #define MAX_ETH_FRAME_SIZE 1536
100 #define RX_SKB_TAILROOM 128
101 #define RX_SKB_HEADROOM (RX_ALLOC_SIZE - \
102 (MAX_ETH_FRAME_SIZE + RX_SKB_TAILROOM) + 0)
104 /* WDT Late COL Lenght COL Type */
105 #define ERROR_FILTER_MASK ((1<<14) | (1<<15) | (1<<16) | (1<<17) | (0<<18) | \
106 /* MII Dribbling CRC Len/type Control */\
107 (1<<19) | (1<<20) | (1<<21) | (0<<24) | (1<<25) | \
110 #define TX_RING_SIZE 30
111 #define RX_RING_SIZE 30
113 static inline u32 nuport_mac_readl(void __iomem *reg)
115 return __raw_readl(reg);
118 static inline u8 nuport_mac_readb(void __iomem *reg)
120 return __raw_readb(reg);
123 static inline void nuport_mac_writel(u32 value, void __iomem *reg)
125 __raw_writel(value, reg);
128 static inline void nuport_mac_writeb(u8 value, void __iomem *reg)
130 __raw_writel(value, reg);
133 /* MAC private data */
134 struct nuport_mac_priv {
137 void __iomem *mac_base;
138 void __iomem *dma_base;
143 struct clk *emac_clk;
144 struct clk *ephy_clk;
146 /* Transmit buffers */
147 struct sk_buff *tx_skb[TX_RING_SIZE];
149 unsigned int valid_txskb[TX_RING_SIZE];
152 unsigned int tx_full;
154 /* Receive buffers */
155 struct sk_buff *rx_skb[RX_RING_SIZE];
157 unsigned int irq_rxskb[RX_RING_SIZE];
158 int pkt_len[RX_RING_SIZE];
161 unsigned int rx_full;
163 unsigned int first_pkt;
166 struct napi_struct napi;
167 struct net_device *dev;
168 struct platform_device *pdev;
169 struct mii_bus *mii_bus;
170 struct phy_device *phydev;
174 unsigned int buffer_shifting_len;
177 static inline int nuport_mac_mii_busy_wait(struct nuport_mac_priv *priv)
180 unsigned long finish = jiffies + 3 * HZ;
184 if (!(nuport_mac_readl(MII_ADDR_REG) & MII_BUSY))
187 } while (!time_after_eq(curr, finish));
192 /* Read from PHY registers */
193 static int nuport_mac_mii_read(struct mii_bus *bus,
194 int mii_id, int regnum)
196 struct net_device *dev = bus->priv;
197 struct nuport_mac_priv *priv = netdev_priv(dev);
201 ret = nuport_mac_mii_busy_wait(priv);
205 val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT) | MII_BUSY;
206 nuport_mac_writel(val, MII_ADDR_REG);
207 ret = nuport_mac_mii_busy_wait(priv);
211 return nuport_mac_readl(MII_DATA_REG);
214 static int nuport_mac_mii_write(struct mii_bus *bus, int mii_id,
215 int regnum, u16 value)
217 struct net_device *dev = bus->priv;
218 struct nuport_mac_priv *priv = netdev_priv(dev);
222 ret = nuport_mac_mii_busy_wait(priv);
226 val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT);
227 val |= MII_BUSY | MII_WRITE;
228 nuport_mac_writel(value, MII_DATA_REG);
229 nuport_mac_writel(val, MII_ADDR_REG);
231 return nuport_mac_mii_busy_wait(priv);
234 static int nuport_mac_mii_reset(struct mii_bus *bus)
239 static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
243 unsigned int timeout = 2048;
246 reg = nuport_mac_readl(TX_START_DMA);
247 if (!(reg & TX_DMA_ENABLE)) {
248 netdev_dbg(priv->dev, "dma ready\n");
257 priv->tx_addr = dma_map_single(&priv->pdev->dev, skb->data,
258 skb->len, DMA_TO_DEVICE);
260 /* enable enhanced mode */
261 nuport_mac_writel(TX_DMA_ENH_ENABLE, TX_DMA_ENH);
262 nuport_mac_writel(priv->tx_addr, TX_BUFFER_ADDR);
263 nuport_mac_writel((skb->len) - 1, TX_PKT_BYTES);
265 reg = TX_DMA_ENABLE | TX_DMA_START_FRAME | TX_DMA_END_FRAME;
266 nuport_mac_writel(reg, TX_START_DMA);
271 static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv)
275 reg = nuport_mac_readl(TX_START_DMA);
277 nuport_mac_writel(reg, TX_START_DMA);
280 static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
284 unsigned int timeout = 2048;
287 reg = nuport_mac_readl(RX_START_DMA);
288 if (!(reg & RX_DMA_ENABLE)) {
289 netdev_dbg(priv->dev, "dma ready\n");
298 priv->rx_addr = dma_map_single(&priv->pdev->dev, skb->data,
299 RX_ALLOC_SIZE, DMA_FROM_DEVICE);
301 nuport_mac_writel(priv->rx_addr, RX_BUFFER_ADDR);
303 nuport_mac_writel(RX_DMA_ENABLE, RX_START_DMA);
308 static void nuport_mac_reset_rx_dma(struct nuport_mac_priv *priv)
312 reg = nuport_mac_readl(RX_START_DMA);
314 nuport_mac_writel(reg, RX_START_DMA);
317 /* I suppose this might do something, but I am not sure actually */
318 static void nuport_mac_disable_rx_dma(struct nuport_mac_priv *priv)
322 reg = nuport_mac_readl(RX_DMA_ENH);
323 reg &= ~RX_DMA_INT_ENABLE;
324 nuport_mac_writel(reg, RX_DMA_ENH);
327 static void nuport_mac_enable_rx_dma(struct nuport_mac_priv *priv)
331 reg = nuport_mac_readl(RX_DMA_ENH);
332 reg |= RX_DMA_INT_ENABLE;
333 nuport_mac_writel(reg, RX_DMA_ENH);
336 /* Add packets to the transmit queue */
337 static int nuport_mac_start_xmit(struct sk_buff *skb, struct net_device *dev)
340 struct nuport_mac_priv *priv = netdev_priv(dev);
343 if (netif_queue_stopped(dev)) {
344 netdev_warn(dev, "netif queue was stopped, restarting\n");
345 netif_start_queue(dev);
348 spin_lock_irqsave(&priv->lock, flags);
349 if (priv->first_pkt) {
350 ret = nuport_mac_start_tx_dma(priv, skb);
352 netif_stop_queue(dev);
353 spin_unlock_irqrestore(&priv->lock, flags);
354 netdev_err(dev, "transmit path busy\n");
355 return NETDEV_TX_BUSY;
360 priv->tx_skb[priv->cur_tx] = skb;
361 dev->stats.tx_bytes += skb->len;
362 dev->stats.tx_packets++;
363 priv->valid_txskb[priv->cur_tx] = 1;
365 dev->trans_start = jiffies;
367 if (priv->cur_tx >= TX_RING_SIZE)
370 spin_unlock_irqrestore(&priv->lock, flags);
372 if (priv->valid_txskb[priv->cur_tx]) {
374 netdev_err(dev, "stopping queue\n");
375 netif_stop_queue(dev);
381 static void nuport_mac_adjust_link(struct net_device *dev)
383 struct nuport_mac_priv *priv = netdev_priv(dev);
384 struct phy_device *phydev = priv->phydev;
385 unsigned int status_changed = 0;
390 if (priv->old_link != phydev->link) {
392 priv->old_link = phydev->link;
395 if (phydev->link & (priv->old_duplex != phydev->duplex)) {
396 reg = nuport_mac_readl(CTRL_REG);
397 if (phydev->duplex == DUPLEX_FULL)
401 nuport_mac_writel(reg, CTRL_REG);
404 priv->old_duplex = phydev->duplex;
410 pr_info("%s: link %s", dev->name, phydev->link ?
413 pr_cont(" - %d/%s", phydev->speed,
414 phydev->duplex == DUPLEX_FULL ? "full" : "half");
419 static irqreturn_t nuport_mac_link_interrupt(int irq, void *dev_id)
421 struct net_device *dev = dev_id;
422 struct nuport_mac_priv *priv = netdev_priv(dev);
426 irqreturn_t ret = IRQ_HANDLED;
428 spin_lock_irqsave(&priv->lock, flags);
429 reg = nuport_mac_readl(LINK_INT_CSR);
430 phy_addr = (reg >> LINK_PHY_ADDR_SHIFT) & (PHY_MAX_ADDR - 1);
432 if (phy_addr != priv->phydev->addr) {
433 netdev_err(dev, "spurious PHY irq (phy: %d)\n", phy_addr);
438 priv->phydev->link = (reg & LINK_UP);
439 nuport_mac_adjust_link(dev);
442 spin_unlock_irqrestore(&priv->lock, flags);
446 static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
448 struct net_device *dev = (struct net_device *)dev_id;
449 struct nuport_mac_priv *priv = netdev_priv(dev);
455 spin_lock_irqsave(&priv->lock, flags);
456 /* clear status word available if ready */
457 reg = nuport_mac_readl(TX_START_DMA);
458 if (reg & TX_DMA_STATUS_AVAIL) {
459 nuport_mac_writel(reg, TX_START_DMA);
460 reg = nuport_mac_readl(TX_DMA_STATUS);
463 dev->stats.tx_errors++;
465 netdev_dbg(dev, "no status word: %08x\n", reg);
467 skb = priv->tx_skb[priv->dma_tx];
468 priv->tx_skb[priv->dma_tx] = NULL;
469 priv->valid_txskb[priv->dma_tx] = 0;
470 dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len,
472 dev_kfree_skb_irq(skb);
475 if (priv->dma_tx >= TX_RING_SIZE)
478 if (!priv->valid_txskb[priv->dma_tx])
481 ret = nuport_mac_start_tx_dma(priv, priv->tx_skb[priv->dma_tx]);
483 netdev_err(dev, "failed to restart TX dma\n");
487 netdev_dbg(dev, "restarting transmit queue\n");
488 netif_wake_queue(dev);
492 spin_unlock_irqrestore(&priv->lock, flags);
497 static unsigned int nuport_mac_has_work(struct nuport_mac_priv *priv)
501 for (i = 0; i < RX_RING_SIZE; i++)
508 static irqreturn_t nuport_mac_rx_interrupt(int irq, void *dev_id)
510 struct net_device *dev = (struct net_device *)dev_id;
511 struct nuport_mac_priv *priv = netdev_priv(dev);
515 spin_lock_irqsave(&priv->lock, flags);
516 if (!priv->rx_full) {
517 priv->pkt_len[priv->dma_rx] = nuport_mac_readl(RX_ACT_BYTES) - 4;
518 priv->irq_rxskb[priv->dma_rx] = 0;
521 if (priv->dma_rx >= RX_RING_SIZE)
526 if (priv->irq_rxskb[priv->dma_rx] == 1) {
527 ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[priv->dma_rx]);
529 netdev_err(dev, "failed to start rx dma\n");
532 netdev_dbg(dev, "RX ring full\n");
535 if (likely(nuport_mac_has_work(priv))) {
536 /* find a way to disable DMA rx irq */
537 nuport_mac_disable_rx_dma(priv);
538 napi_schedule(&priv->napi);
540 spin_unlock_irqrestore(&priv->lock, flags);
545 /* Process received packets in tasklet */
546 static int nuport_mac_rx(struct net_device *dev, int limit)
548 struct nuport_mac_priv *priv = netdev_priv(dev);
553 while (count < limit && !priv->irq_rxskb[priv->cur_rx]) {
554 skb = priv->rx_skb[priv->cur_rx];
555 len = priv->pkt_len[priv->cur_rx];
557 /* Remove 2 bytes added by RX buffer shifting */
558 len = len - priv->buffer_shifting_len;
559 skb->data = skb->data + priv->buffer_shifting_len;
561 /* Get packet status */
562 status = get_unaligned((u32 *) (skb->data + len));
565 dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len,
568 /* packet filter failed */
569 if (!(status & (1 << 30))) {
570 dev_kfree_skb_irq(skb);
575 if (status & (1 << 31)) {
576 dev->stats.rx_missed_errors++;
577 dev_kfree_skb_irq(skb);
581 /* Not ethernet type */
582 if ((!(status & (1 << 18))) || (status & ERROR_FILTER_MASK))
583 dev->stats.rx_errors++;
585 if (len > MAX_ETH_FRAME_SIZE) {
586 dev_kfree_skb_irq(skb);
591 skb->protocol = eth_type_trans(skb, dev);
592 dev->stats.rx_packets++;
594 if (status & (1 << 29))
595 skb->pkt_type = PACKET_OTHERHOST;
596 if (status & (1 << 27))
597 skb->pkt_type = PACKET_MULTICAST;
598 if (status & (1 << 28))
599 skb->pkt_type = PACKET_BROADCAST;
601 skb->ip_summed = CHECKSUM_UNNECESSARY;
603 /* Pass the received packet to network layer */
604 status = netif_receive_skb(skb);
605 if (status != NET_RX_DROP)
606 dev->stats.rx_bytes += len - 4; /* Without CRC */
608 dev->stats.rx_dropped++;
610 dev->last_rx = jiffies;
613 skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
614 skb_reserve(skb, RX_SKB_HEADROOM);
615 priv->rx_skb[priv->cur_rx] = skb;
616 priv->irq_rxskb[priv->cur_rx] = 1;
619 if (priv->cur_rx >= RX_RING_SIZE)
627 static int nuport_mac_poll(struct napi_struct *napi, int budget)
629 struct nuport_mac_priv *priv =
630 container_of(napi, struct nuport_mac_priv, napi);
631 struct net_device *dev = priv->dev;
634 work_done = nuport_mac_rx(dev, budget);
636 if (work_done < budget) {
638 nuport_mac_enable_rx_dma(priv);
644 static void nuport_mac_init_tx_ring(struct nuport_mac_priv *priv)
648 priv->cur_tx = priv->dma_tx = priv->tx_full = 0;
649 for (i = 0; i < TX_RING_SIZE; i++) {
650 priv->tx_skb[i] = NULL;
651 priv->valid_txskb[i] = 0;
656 static int nuport_mac_init_rx_ring(struct net_device *dev)
658 struct nuport_mac_priv *priv = netdev_priv(dev);
662 priv->cur_rx = priv->dma_rx = priv->rx_full = 0;
664 for (i = 0; i < RX_RING_SIZE; i++) {
665 skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
668 skb_reserve(skb, RX_SKB_HEADROOM);
669 priv->rx_skb[i] = skb;
670 priv->irq_rxskb[i] = 1;
676 static void nuport_mac_free_rx_ring(struct nuport_mac_priv *priv)
680 for (i = 0; i < RX_RING_SIZE; i++) {
681 if (!priv->rx_skb[i])
684 dev_kfree_skb(priv->rx_skb[i]);
685 priv->rx_skb[i] = NULL;
689 static void nuport_mac_read_mac_address(struct net_device *dev)
691 struct nuport_mac_priv *priv = netdev_priv(dev);
694 for (i = 0; i < 4; i++)
695 dev->dev_addr[i] = nuport_mac_readb(MAC_ADDR_LOW_REG + i);
696 dev->dev_addr[4] = nuport_mac_readb(MAC_ADDR_HIGH_REG);
697 dev->dev_addr[5] = nuport_mac_readb(MAC_ADDR_HIGH_REG + 1);
699 if (!is_valid_ether_addr(dev->dev_addr)) {
700 dev_info(&priv->pdev->dev, "using random address\n");
701 random_ether_addr(dev->dev_addr);
705 static int nuport_mac_change_mac_address(struct net_device *dev, void *mac_addr)
707 struct sockaddr *addr = mac_addr;
708 struct nuport_mac_priv *priv = netdev_priv(dev);
709 unsigned long *temp = (unsigned long *)dev->dev_addr;
712 if (netif_running(dev))
715 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
717 spin_lock_irq(&priv->lock);
719 nuport_mac_writel(*temp, MAC_ADDR_LOW_REG);
720 temp = (unsigned long *)(dev->dev_addr + 4);
721 nuport_mac_writel(*temp, MAC_ADDR_HIGH_REG);
723 low = nuport_mac_readl(MAC_ADDR_LOW_REG);
724 high = nuport_mac_readl(MAC_ADDR_HIGH_REG);
726 spin_unlock_irq(&priv->lock);
731 static int nuport_mac_open(struct net_device *dev)
734 struct nuport_mac_priv *priv = netdev_priv(dev);
738 ret = clk_enable(priv->emac_clk);
740 netdev_err(dev, "failed to enable EMAC clock\n");
744 /* Set MAC into full duplex mode by default */
745 reg |= RX_ENABLE | TX_ENABLE;
746 reg |= DEFER_CHECK | STRIP_PAD | DRTRY_DISABLE;
747 reg |= FULL_DUPLEX | HBD_DISABLE;
748 nuport_mac_writel(reg, CTRL_REG);
750 /* set mac address in hardware in case it was not already */
751 nuport_mac_change_mac_address(dev, dev->dev_addr);
753 ret = request_irq(priv->link_irq, &nuport_mac_link_interrupt,
756 netdev_err(dev, "unable to request link interrupt\n");
760 phy_start(priv->phydev);
762 /* Enable link interrupt monitoring for our PHY address */
763 reg = LINK_INT_EN | (priv->phydev->addr << LINK_PHY_ADDR_SHIFT);
764 /* MII_BMSR register to be watched */
765 reg |= (1 << LINK_PHY_REG_SHIFT);
766 /* BMSR_STATUS to be watched in particular */
767 reg |= (2 << LINK_BIT_UP_SHIFT);
769 spin_lock_irqsave(&priv->lock, flags);
770 nuport_mac_writel(reg, LINK_INT_CSR);
771 nuport_mac_writel(LINK_POLL_MASK, LINK_INT_POLL_TIME);
772 spin_unlock_irqrestore(&priv->lock, flags);
774 ret = request_irq(priv->tx_irq, &nuport_mac_tx_interrupt,
777 netdev_err(dev, "unable to request rx interrupt\n");
781 napi_enable(&priv->napi);
783 ret = request_irq(priv->rx_irq, &nuport_mac_rx_interrupt,
786 netdev_err(dev, "unable to request tx interrupt\n");
790 netif_start_queue(dev);
792 nuport_mac_init_tx_ring(priv);
794 ret = nuport_mac_init_rx_ring(dev);
796 netdev_err(dev, "rx ring init failed\n");
800 nuport_mac_reset_tx_dma(priv);
801 nuport_mac_reset_rx_dma(priv);
804 return nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
807 nuport_mac_free_rx_ring(priv);
808 free_irq(priv->rx_irq, dev);
810 free_irq(priv->tx_irq, dev);
812 free_irq(priv->link_irq, dev);
814 clk_disable(priv->emac_clk);
818 static int nuport_mac_close(struct net_device *dev)
820 struct nuport_mac_priv *priv = netdev_priv(dev);
822 spin_lock_irq(&priv->lock);
823 napi_disable(&priv->napi);
824 netif_stop_queue(dev);
826 free_irq(priv->link_irq, dev);
827 /* disable PHY polling */
828 nuport_mac_writel(0, LINK_INT_CSR);
829 nuport_mac_writel(0, LINK_INT_POLL_TIME);
830 phy_stop(priv->phydev);
832 free_irq(priv->tx_irq, dev);
833 free_irq(priv->rx_irq, dev);
834 spin_unlock_irq(&priv->lock);
836 nuport_mac_free_rx_ring(priv);
838 clk_disable(priv->emac_clk);
843 static void nuport_mac_tx_timeout(struct net_device *dev)
845 struct nuport_mac_priv *priv = netdev_priv(dev);
848 netdev_warn(dev, "transmit timeout, attempting recovery\n");
850 netdev_info(dev, "TX DMA regs\n");
851 for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
852 netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(TX_DMA_BASE + i));
853 netdev_info(dev, "RX DMA regs\n");
854 for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
855 netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(RX_DMA_BASE + i));
857 nuport_mac_init_tx_ring(priv);
858 nuport_mac_reset_tx_dma(priv);
860 netif_wake_queue(dev);
863 static int nuport_mac_mii_probe(struct net_device *dev)
865 struct nuport_mac_priv *priv = netdev_priv(dev);
866 struct phy_device *phydev = NULL;
869 ret = clk_enable(priv->ephy_clk);
871 netdev_err(dev, "unable to enable ePHY clk\n");
875 phydev = phy_find_first(priv->mii_bus);
877 netdev_err(dev, "no PHYs found\n");
882 phydev = phy_connect(dev, dev_name(&phydev->dev),
883 nuport_mac_adjust_link, 0,
884 PHY_INTERFACE_MODE_MII);
885 if (IS_ERR(phydev)) {
886 netdev_err(dev, "could not attach PHY\n");
887 ret = PTR_ERR(phydev);
891 phydev->supported &= PHY_BASIC_FEATURES;
892 phydev->advertising = phydev->supported;
893 priv->phydev = phydev;
895 priv->old_duplex = DUPLEX_FULL;
897 dev_info(&priv->pdev->dev, "attached PHY driver [%s] "
898 "(mii_bus:phy_addr=%d)\n",
899 phydev->drv->name, phydev->addr);
904 /* disable the Ethernet PHY clock for the moment */
905 clk_disable(priv->ephy_clk);
910 static void nuport_mac_ethtool_drvinfo(struct net_device *dev,
911 struct ethtool_drvinfo *info)
913 strncpy(info->driver, "nuport-mac", sizeof(info->driver));
914 strncpy(info->version, "0.1", sizeof(info->version));
915 strncpy(info->fw_version, "N/A", sizeof(info->fw_version));
916 strncpy(info->bus_info, "internal", sizeof(info->bus_info));
918 info->testinfo_len = 0;
919 info->regdump_len = 0;
920 info->eedump_len = 0;
923 static int nuport_mac_ethtool_get_settings(struct net_device *dev,
924 struct ethtool_cmd *cmd)
926 struct nuport_mac_priv *priv = netdev_priv(dev);
929 return phy_ethtool_gset(priv->phydev, cmd);
934 static int nuport_mac_ethtool_set_settings(struct net_device *dev,
935 struct ethtool_cmd *cmd)
937 struct nuport_mac_priv *priv = netdev_priv(dev);
940 return phy_ethtool_sset(priv->phydev, cmd);
945 static void nuport_mac_set_msglevel(struct net_device *dev, u32 msg_level)
947 struct nuport_mac_priv *priv = netdev_priv(dev);
949 priv->msg_level = msg_level;
952 static u32 nuport_mac_get_msglevel(struct net_device *dev)
954 struct nuport_mac_priv *priv = netdev_priv(dev);
956 return priv->msg_level;
959 static const struct ethtool_ops nuport_mac_ethtool_ops = {
960 .get_drvinfo = nuport_mac_ethtool_drvinfo,
961 .get_link = ethtool_op_get_link,
962 .get_settings = nuport_mac_ethtool_get_settings,
963 .set_settings = nuport_mac_ethtool_set_settings,
964 .set_msglevel = nuport_mac_set_msglevel,
965 .get_msglevel = nuport_mac_get_msglevel,
968 static const struct net_device_ops nuport_mac_ops = {
969 .ndo_open = nuport_mac_open,
970 .ndo_stop = nuport_mac_close,
971 .ndo_start_xmit = nuport_mac_start_xmit,
972 .ndo_change_mtu = eth_change_mtu,
973 .ndo_validate_addr = eth_validate_addr,
974 .ndo_set_mac_address = nuport_mac_change_mac_address,
975 .ndo_tx_timeout = nuport_mac_tx_timeout,
978 static int __init nuport_mac_probe(struct platform_device *pdev)
980 struct net_device *dev;
981 struct nuport_mac_priv *priv = NULL;
982 struct resource *regs, *dma;
984 int rx_irq, tx_irq, link_irq;
986 const unsigned int *intspec;
988 dev = alloc_etherdev(sizeof(struct nuport_mac_priv));
990 dev_err(&pdev->dev, "no memory for net_device\n");
994 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
995 dma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
997 dev_err(&pdev->dev, "failed to get regs resources\n");
1002 rx_irq = platform_get_irq(pdev, 0);
1003 tx_irq = platform_get_irq(pdev, 1);
1004 link_irq = platform_get_irq(pdev, 2);
1005 if (rx_irq < 0 || tx_irq < 0 || link_irq < 0) {
1010 platform_set_drvdata(pdev, dev);
1011 SET_NETDEV_DEV(dev, &pdev->dev);
1012 priv = netdev_priv(dev);
1015 spin_lock_init(&priv->lock);
1017 intspec = of_get_property(pdev->dev.of_node,
1018 "nuport-mac,buffer-shifting", NULL);
1020 priv->buffer_shifting_len = 0;
1022 priv->buffer_shifting_len = 2;
1024 priv->mac_base = devm_ioremap(&pdev->dev,
1025 regs->start, resource_size(regs));
1026 if (!priv->mac_base) {
1027 dev_err(&pdev->dev, "failed to remap regs\n");
1032 priv->dma_base = devm_ioremap(&pdev->dev,
1033 dma->start, resource_size(dma));
1034 if (!priv->dma_base) {
1035 dev_err(&pdev->dev, "failed to remap dma-regs\n");
1040 priv->emac_clk = clk_get(&pdev->dev, "emac");
1041 if (IS_ERR_OR_NULL(priv->emac_clk)) {
1042 dev_err(&pdev->dev, "failed to get emac clk\n");
1043 ret = PTR_ERR(priv->emac_clk);
1047 priv->ephy_clk = clk_get(&pdev->dev, "ephy");
1048 if (IS_ERR_OR_NULL(priv->ephy_clk)) {
1049 dev_err(&pdev->dev, "failed to get ephy clk\n");
1050 ret = PTR_ERR(priv->ephy_clk);
1054 priv->link_irq = link_irq;
1055 priv->rx_irq = rx_irq;
1056 priv->tx_irq = tx_irq;
1057 priv->msg_level = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK;
1058 dev->netdev_ops = &nuport_mac_ops;
1059 dev->ethtool_ops = &nuport_mac_ethtool_ops;
1060 dev->watchdog_timeo = HZ;
1061 dev->flags = IFF_BROADCAST; /* Supports Broadcast */
1062 dev->tx_queue_len = TX_RING_SIZE / 2;
1064 netif_napi_add(dev, &priv->napi, nuport_mac_poll, 64);
1066 priv->mii_bus = mdiobus_alloc();
1067 if (!priv->mii_bus) {
1068 dev_err(&pdev->dev, "mii bus allocation failed\n");
1072 priv->mii_bus->priv = dev;
1073 priv->mii_bus->read = nuport_mac_mii_read;
1074 priv->mii_bus->write = nuport_mac_mii_write;
1075 priv->mii_bus->reset = nuport_mac_mii_reset;
1076 priv->mii_bus->name = "nuport-mac-mii";
1077 priv->mii_bus->phy_mask = (1 << 0);
1078 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
1079 priv->mii_bus->irq = kzalloc(PHY_MAX_ADDR * sizeof(int), GFP_KERNEL);
1080 if (!priv->mii_bus->irq) {
1081 dev_err(&pdev->dev, "failed to allocate mii_bus irqs\n");
1086 /* We support PHY interrupts routed back to the MAC */
1087 for (i = 0; i < PHY_MAX_ADDR; i++)
1088 priv->mii_bus->irq[i] = PHY_IGNORE_INTERRUPT;
1090 ret = mdiobus_register(priv->mii_bus);
1092 dev_err(&pdev->dev, "failed to register mii_bus\n");
1096 ret = nuport_mac_mii_probe(dev);
1098 dev_err(&pdev->dev, "failed to probe MII bus\n");
1099 goto out_mdio_unregister;
1102 ret = register_netdev(dev);
1104 dev_err(&pdev->dev, "failed to register net_device\n");
1105 goto out_mdio_probe;
1108 /* read existing mac address */
1109 nuport_mac_read_mac_address(dev);
1111 dev_info(&pdev->dev, "registered (MAC: %pM)\n", dev->dev_addr);
1116 phy_disconnect(priv->phydev);
1117 out_mdio_unregister:
1118 mdiobus_unregister(priv->mii_bus);
1120 kfree(priv->mii_bus->irq);
1122 mdiobus_free(priv->mii_bus);
1124 platform_set_drvdata(pdev, NULL);
1126 clk_put(priv->ephy_clk);
1127 clk_put(priv->emac_clk);
1129 platform_set_drvdata(pdev, NULL);
1133 static int nuport_mac_remove(struct platform_device *pdev)
1135 struct net_device *dev = platform_get_drvdata(pdev);
1136 struct nuport_mac_priv *priv = netdev_priv(dev);
1138 unregister_netdev(dev);
1139 phy_disconnect(priv->phydev);
1140 mdiobus_unregister(priv->mii_bus);
1141 kfree(priv->mii_bus->irq);
1142 mdiobus_free(priv->mii_bus);
1143 clk_put(priv->ephy_clk);
1144 clk_put(priv->emac_clk);
1147 platform_set_drvdata(pdev, NULL);
1152 static struct of_device_id nuport_eth_ids[] __initdata = {
1153 {.compatible = "moschip,nuport-mac",},
1157 static struct platform_driver nuport_eth_driver = {
1159 .name = "nuport-mac",
1160 .owner = THIS_MODULE,
1161 .of_match_table = nuport_eth_ids,
1163 .probe = nuport_mac_probe,
1164 .remove = __devexit_p(nuport_mac_remove),
1167 module_platform_driver(nuport_eth_driver);
1169 MODULE_AUTHOR("Moschip Semiconductors Ltd.");
1170 MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver");
1171 MODULE_LICENSE("GPL");