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
);
262 /* enable enhanced mode */
263 nuport_mac_writel(TX_DMA_ENH_ENABLE
, TX_DMA_ENH
);
264 nuport_mac_writel(priv
->tx_addr
, TX_BUFFER_ADDR
);
265 nuport_mac_writel((skb
->len
) - 1, TX_PKT_BYTES
);
267 reg
= TX_DMA_ENABLE
| TX_DMA_START_FRAME
| TX_DMA_END_FRAME
;
268 nuport_mac_writel(reg
, TX_START_DMA
);
273 static void nuport_mac_reset_tx_dma(struct nuport_mac_priv
*priv
)
277 reg
= nuport_mac_readl(TX_START_DMA
);
279 nuport_mac_writel(reg
, TX_START_DMA
);
282 static int nuport_mac_start_rx_dma(struct nuport_mac_priv
*priv
,
286 unsigned int timeout
= 2048;
289 reg
= nuport_mac_readl(RX_START_DMA
);
290 if (!(reg
& RX_DMA_ENABLE
)) {
291 netdev_dbg(priv
->dev
, "dma ready\n");
300 priv
->rx_addr
= dma_map_single(&priv
->pdev
->dev
, skb
->data
,
301 RX_ALLOC_SIZE
, DMA_FROM_DEVICE
);
305 nuport_mac_writel(priv
->rx_addr
, RX_BUFFER_ADDR
);
307 nuport_mac_writel(RX_DMA_ENABLE
, RX_START_DMA
);
312 static void nuport_mac_reset_rx_dma(struct nuport_mac_priv
*priv
)
316 reg
= nuport_mac_readl(RX_START_DMA
);
318 nuport_mac_writel(reg
, RX_START_DMA
);
321 /* I suppose this might do something, but I am not sure actually */
322 static void nuport_mac_disable_rx_dma(struct nuport_mac_priv
*priv
)
326 reg
= nuport_mac_readl(RX_DMA_ENH
);
327 reg
&= ~RX_DMA_INT_ENABLE
;
328 nuport_mac_writel(reg
, RX_DMA_ENH
);
331 static void nuport_mac_enable_rx_dma(struct nuport_mac_priv
*priv
)
335 reg
= nuport_mac_readl(RX_DMA_ENH
);
336 reg
|= RX_DMA_INT_ENABLE
;
337 nuport_mac_writel(reg
, RX_DMA_ENH
);
340 /* Add packets to the transmit queue */
341 static int nuport_mac_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
344 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
347 if (netif_queue_stopped(dev
)) {
348 netdev_warn(dev
, "netif queue was stopped, restarting\n");
349 netif_start_queue(dev
);
352 spin_lock_irqsave(&priv
->lock
, flags
);
353 if (priv
->first_pkt
) {
354 ret
= nuport_mac_start_tx_dma(priv
, skb
);
356 netif_stop_queue(dev
);
357 spin_unlock_irqrestore(&priv
->lock
, flags
);
358 netdev_err(dev
, "transmit path busy\n");
359 return NETDEV_TX_BUSY
;
364 priv
->tx_skb
[priv
->cur_tx
] = skb
;
365 dev
->stats
.tx_bytes
+= skb
->len
;
366 dev
->stats
.tx_packets
++;
367 priv
->valid_txskb
[priv
->cur_tx
] = 1;
369 dev
->trans_start
= jiffies
;
371 if (priv
->cur_tx
>= TX_RING_SIZE
)
374 spin_unlock_irqrestore(&priv
->lock
, flags
);
376 if (priv
->valid_txskb
[priv
->cur_tx
]) {
378 netdev_err(dev
, "stopping queue\n");
379 netif_stop_queue(dev
);
385 static void nuport_mac_adjust_link(struct net_device
*dev
)
387 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
388 struct phy_device
*phydev
= priv
->phydev
;
389 unsigned int status_changed
= 0;
394 if (priv
->old_link
!= phydev
->link
) {
396 priv
->old_link
= phydev
->link
;
399 if (phydev
->link
& (priv
->old_duplex
!= phydev
->duplex
)) {
400 reg
= nuport_mac_readl(CTRL_REG
);
401 if (phydev
->duplex
== DUPLEX_FULL
)
405 nuport_mac_writel(reg
, CTRL_REG
);
408 priv
->old_duplex
= phydev
->duplex
;
414 pr_info("%s: link %s", dev
->name
, phydev
->link
?
417 pr_cont(" - %d/%s", phydev
->speed
,
418 phydev
->duplex
== DUPLEX_FULL
? "full" : "half");
423 static irqreturn_t
nuport_mac_link_interrupt(int irq
, void *dev_id
)
425 struct net_device
*dev
= dev_id
;
426 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
430 irqreturn_t ret
= IRQ_HANDLED
;
432 spin_lock_irqsave(&priv
->lock
, flags
);
433 reg
= nuport_mac_readl(LINK_INT_CSR
);
434 phy_addr
= (reg
>> LINK_PHY_ADDR_SHIFT
) & (PHY_MAX_ADDR
- 1);
436 if (phy_addr
!= priv
->phydev
->addr
) {
437 netdev_err(dev
, "spurious PHY irq (phy: %d)\n", phy_addr
);
442 priv
->phydev
->link
= (reg
& LINK_UP
);
443 nuport_mac_adjust_link(dev
);
446 spin_unlock_irqrestore(&priv
->lock
, flags
);
450 static irqreturn_t
nuport_mac_tx_interrupt(int irq
, void *dev_id
)
452 struct net_device
*dev
= (struct net_device
*)dev_id
;
453 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
459 spin_lock_irqsave(&priv
->lock
, flags
);
460 /* clear status word available if ready */
461 reg
= nuport_mac_readl(TX_START_DMA
);
462 if (reg
& TX_DMA_STATUS_AVAIL
) {
463 nuport_mac_writel(reg
, TX_START_DMA
);
464 reg
= nuport_mac_readl(TX_DMA_STATUS
);
467 dev
->stats
.tx_errors
++;
469 netdev_dbg(dev
, "no status word: %08x\n", reg
);
471 skb
= priv
->tx_skb
[priv
->dma_tx
];
472 priv
->tx_skb
[priv
->dma_tx
] = NULL
;
473 priv
->valid_txskb
[priv
->dma_tx
] = 0;
474 dma_unmap_single(&priv
->pdev
->dev
, priv
->rx_addr
, skb
->len
,
476 dev_kfree_skb_irq(skb
);
479 if (priv
->dma_tx
>= TX_RING_SIZE
)
482 if (!priv
->valid_txskb
[priv
->dma_tx
])
485 ret
= nuport_mac_start_tx_dma(priv
, priv
->tx_skb
[priv
->dma_tx
]);
487 netdev_err(dev
, "failed to restart TX dma\n");
491 netdev_dbg(dev
, "restarting transmit queue\n");
492 netif_wake_queue(dev
);
496 spin_unlock_irqrestore(&priv
->lock
, flags
);
501 static unsigned int nuport_mac_has_work(struct nuport_mac_priv
*priv
)
505 for (i
= 0; i
< RX_RING_SIZE
; i
++)
512 static irqreturn_t
nuport_mac_rx_interrupt(int irq
, void *dev_id
)
514 struct net_device
*dev
= (struct net_device
*)dev_id
;
515 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
519 spin_lock_irqsave(&priv
->lock
, flags
);
520 if (!priv
->rx_full
) {
521 priv
->pkt_len
[priv
->dma_rx
] = nuport_mac_readl(RX_ACT_BYTES
) - 4;
522 priv
->irq_rxskb
[priv
->dma_rx
] = 0;
525 if (priv
->dma_rx
>= RX_RING_SIZE
)
530 if (priv
->irq_rxskb
[priv
->dma_rx
] == 1) {
531 ret
= nuport_mac_start_rx_dma(priv
, priv
->rx_skb
[priv
->dma_rx
]);
533 netdev_err(dev
, "failed to start rx dma\n");
536 netdev_dbg(dev
, "RX ring full\n");
539 if (likely(nuport_mac_has_work(priv
))) {
540 /* find a way to disable DMA rx irq */
541 nuport_mac_disable_rx_dma(priv
);
542 napi_schedule(&priv
->napi
);
544 spin_unlock_irqrestore(&priv
->lock
, flags
);
549 /* Process received packets in tasklet */
550 static int nuport_mac_rx(struct net_device
*dev
, int limit
)
552 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
557 while (count
< limit
&& !priv
->irq_rxskb
[priv
->cur_rx
]) {
558 skb
= priv
->rx_skb
[priv
->cur_rx
];
559 len
= priv
->pkt_len
[priv
->cur_rx
];
561 /* Remove 2 bytes added by RX buffer shifting */
562 len
= len
- priv
->buffer_shifting_len
;
563 skb
->data
= skb
->data
+ priv
->buffer_shifting_len
;
565 /* Get packet status */
566 status
= get_unaligned((u32
*) (skb
->data
+ len
));
569 dma_unmap_single(&priv
->pdev
->dev
, priv
->rx_addr
, skb
->len
,
572 /* packet filter failed */
573 if (!(status
& (1 << 30))) {
574 dev_kfree_skb_irq(skb
);
579 if (status
& (1 << 31)) {
580 dev
->stats
.rx_missed_errors
++;
581 dev_kfree_skb_irq(skb
);
585 /* Not ethernet type */
586 if ((!(status
& (1 << 18))) || (status
& ERROR_FILTER_MASK
))
587 dev
->stats
.rx_errors
++;
589 if (len
> MAX_ETH_FRAME_SIZE
) {
590 dev_kfree_skb_irq(skb
);
595 skb
->protocol
= eth_type_trans(skb
, dev
);
596 dev
->stats
.rx_packets
++;
598 if (status
& (1 << 29))
599 skb
->pkt_type
= PACKET_OTHERHOST
;
600 if (status
& (1 << 27))
601 skb
->pkt_type
= PACKET_MULTICAST
;
602 if (status
& (1 << 28))
603 skb
->pkt_type
= PACKET_BROADCAST
;
605 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
607 /* Pass the received packet to network layer */
608 status
= netif_receive_skb(skb
);
609 if (status
!= NET_RX_DROP
)
610 dev
->stats
.rx_bytes
+= len
- 4; /* Without CRC */
612 dev
->stats
.rx_dropped
++;
614 dev
->last_rx
= jiffies
;
617 skb
= netdev_alloc_skb(dev
, RX_ALLOC_SIZE
);
618 skb_reserve(skb
, RX_SKB_HEADROOM
);
619 priv
->rx_skb
[priv
->cur_rx
] = skb
;
620 priv
->irq_rxskb
[priv
->cur_rx
] = 1;
623 if (priv
->cur_rx
>= RX_RING_SIZE
)
631 static int nuport_mac_poll(struct napi_struct
*napi
, int budget
)
633 struct nuport_mac_priv
*priv
=
634 container_of(napi
, struct nuport_mac_priv
, napi
);
635 struct net_device
*dev
= priv
->dev
;
638 work_done
= nuport_mac_rx(dev
, budget
);
640 if (work_done
< budget
) {
642 nuport_mac_enable_rx_dma(priv
);
648 static void nuport_mac_init_tx_ring(struct nuport_mac_priv
*priv
)
652 priv
->cur_tx
= priv
->dma_tx
= priv
->tx_full
= 0;
653 for (i
= 0; i
< TX_RING_SIZE
; i
++) {
654 priv
->tx_skb
[i
] = NULL
;
655 priv
->valid_txskb
[i
] = 0;
660 static int nuport_mac_init_rx_ring(struct net_device
*dev
)
662 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
666 priv
->cur_rx
= priv
->dma_rx
= priv
->rx_full
= 0;
668 for (i
= 0; i
< RX_RING_SIZE
; i
++) {
669 skb
= netdev_alloc_skb(dev
, RX_ALLOC_SIZE
);
672 skb_reserve(skb
, RX_SKB_HEADROOM
);
673 priv
->rx_skb
[i
] = skb
;
674 priv
->irq_rxskb
[i
] = 1;
680 static void nuport_mac_free_rx_ring(struct nuport_mac_priv
*priv
)
684 for (i
= 0; i
< RX_RING_SIZE
; i
++) {
685 if (!priv
->rx_skb
[i
])
688 dev_kfree_skb(priv
->rx_skb
[i
]);
689 priv
->rx_skb
[i
] = NULL
;
693 dma_unmap_single(&priv
->pdev
->dev
, priv
->rx_addr
, RX_ALLOC_SIZE
,
697 static void nuport_mac_read_mac_address(struct net_device
*dev
)
699 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
702 for (i
= 0; i
< 4; i
++)
703 dev
->dev_addr
[i
] = nuport_mac_readb(MAC_ADDR_LOW_REG
+ i
);
704 dev
->dev_addr
[4] = nuport_mac_readb(MAC_ADDR_HIGH_REG
);
705 dev
->dev_addr
[5] = nuport_mac_readb(MAC_ADDR_HIGH_REG
+ 1);
707 if (!is_valid_ether_addr(dev
->dev_addr
)) {
708 dev_info(&priv
->pdev
->dev
, "using random address\n");
709 random_ether_addr(dev
->dev_addr
);
713 static int nuport_mac_change_mac_address(struct net_device
*dev
, void *mac_addr
)
715 struct sockaddr
*addr
= mac_addr
;
716 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
717 unsigned long *temp
= (unsigned long *)dev
->dev_addr
;
720 if (netif_running(dev
))
723 memcpy(dev
->dev_addr
, addr
->sa_data
, ETH_ALEN
);
725 spin_lock_irq(&priv
->lock
);
727 nuport_mac_writel(*temp
, MAC_ADDR_LOW_REG
);
728 temp
= (unsigned long *)(dev
->dev_addr
+ 4);
729 nuport_mac_writel(*temp
, MAC_ADDR_HIGH_REG
);
731 low
= nuport_mac_readl(MAC_ADDR_LOW_REG
);
732 high
= nuport_mac_readl(MAC_ADDR_HIGH_REG
);
734 spin_unlock_irq(&priv
->lock
);
739 static int nuport_mac_open(struct net_device
*dev
)
742 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
746 ret
= clk_enable(priv
->emac_clk
);
748 netdev_err(dev
, "failed to enable EMAC clock\n");
752 /* Set MAC into full duplex mode by default */
753 reg
|= RX_ENABLE
| TX_ENABLE
;
754 reg
|= DEFER_CHECK
| STRIP_PAD
| DRTRY_DISABLE
;
755 reg
|= FULL_DUPLEX
| HBD_DISABLE
;
756 nuport_mac_writel(reg
, CTRL_REG
);
758 /* set mac address in hardware in case it was not already */
759 nuport_mac_change_mac_address(dev
, dev
->dev_addr
);
761 ret
= request_irq(priv
->link_irq
, &nuport_mac_link_interrupt
,
764 netdev_err(dev
, "unable to request link interrupt\n");
768 phy_start(priv
->phydev
);
770 /* Enable link interrupt monitoring for our PHY address */
771 reg
= LINK_INT_EN
| (priv
->phydev
->addr
<< LINK_PHY_ADDR_SHIFT
);
772 /* MII_BMSR register to be watched */
773 reg
|= (1 << LINK_PHY_REG_SHIFT
);
774 /* BMSR_STATUS to be watched in particular */
775 reg
|= (2 << LINK_BIT_UP_SHIFT
);
777 spin_lock_irqsave(&priv
->lock
, flags
);
778 nuport_mac_writel(reg
, LINK_INT_CSR
);
779 nuport_mac_writel(LINK_POLL_MASK
, LINK_INT_POLL_TIME
);
780 spin_unlock_irqrestore(&priv
->lock
, flags
);
782 ret
= request_irq(priv
->tx_irq
, &nuport_mac_tx_interrupt
,
785 netdev_err(dev
, "unable to request rx interrupt\n");
789 napi_enable(&priv
->napi
);
791 ret
= request_irq(priv
->rx_irq
, &nuport_mac_rx_interrupt
,
794 netdev_err(dev
, "unable to request tx interrupt\n");
798 netif_start_queue(dev
);
800 nuport_mac_init_tx_ring(priv
);
802 ret
= nuport_mac_init_rx_ring(dev
);
804 netdev_err(dev
, "rx ring init failed\n");
808 nuport_mac_reset_tx_dma(priv
);
809 nuport_mac_reset_rx_dma(priv
);
812 spin_lock_irqsave(&priv
->lock
, flags
);
813 ret
= nuport_mac_start_rx_dma(priv
, priv
->rx_skb
[0]);
814 spin_unlock_irqrestore(&priv
->lock
, flags
);
819 nuport_mac_free_rx_ring(priv
);
820 free_irq(priv
->rx_irq
, dev
);
822 free_irq(priv
->tx_irq
, dev
);
824 free_irq(priv
->link_irq
, dev
);
826 clk_disable(priv
->emac_clk
);
830 static int nuport_mac_close(struct net_device
*dev
)
832 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
834 spin_lock_irq(&priv
->lock
);
835 napi_disable(&priv
->napi
);
836 netif_stop_queue(dev
);
838 free_irq(priv
->link_irq
, dev
);
839 /* disable PHY polling */
840 nuport_mac_writel(0, LINK_INT_CSR
);
841 nuport_mac_writel(0, LINK_INT_POLL_TIME
);
842 phy_stop(priv
->phydev
);
844 free_irq(priv
->tx_irq
, dev
);
845 free_irq(priv
->rx_irq
, dev
);
846 spin_unlock_irq(&priv
->lock
);
848 nuport_mac_free_rx_ring(priv
);
850 clk_disable(priv
->emac_clk
);
855 static void nuport_mac_tx_timeout(struct net_device
*dev
)
857 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
860 netdev_warn(dev
, "transmit timeout, attempting recovery\n");
862 netdev_info(dev
, "TX DMA regs\n");
863 for (i
= 0; i
< DMA_CHAN_WIDTH
; i
+= 4)
864 netdev_info(dev
, "[%02x]: 0x%08x\n", i
, nuport_mac_readl(TX_DMA_BASE
+ i
));
865 netdev_info(dev
, "RX DMA regs\n");
866 for (i
= 0; i
< DMA_CHAN_WIDTH
; i
+= 4)
867 netdev_info(dev
, "[%02x]: 0x%08x\n", i
, nuport_mac_readl(RX_DMA_BASE
+ i
));
869 nuport_mac_init_tx_ring(priv
);
870 nuport_mac_reset_tx_dma(priv
);
872 netif_wake_queue(dev
);
875 static int nuport_mac_mii_probe(struct net_device
*dev
)
877 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
878 struct phy_device
*phydev
= NULL
;
881 ret
= clk_enable(priv
->ephy_clk
);
883 netdev_err(dev
, "unable to enable ePHY clk\n");
887 phydev
= phy_find_first(priv
->mii_bus
);
889 netdev_err(dev
, "no PHYs found\n");
894 phydev
= phy_connect(dev
, dev_name(&phydev
->dev
),
895 nuport_mac_adjust_link
, 0,
896 PHY_INTERFACE_MODE_MII
);
897 if (IS_ERR(phydev
)) {
898 netdev_err(dev
, "could not attach PHY\n");
899 ret
= PTR_ERR(phydev
);
903 phydev
->supported
&= PHY_BASIC_FEATURES
;
904 phydev
->advertising
= phydev
->supported
;
905 priv
->phydev
= phydev
;
907 priv
->old_duplex
= DUPLEX_FULL
;
909 dev_info(&priv
->pdev
->dev
, "attached PHY driver [%s] "
910 "(mii_bus:phy_addr=%d)\n",
911 phydev
->drv
->name
, phydev
->addr
);
916 /* disable the Ethernet PHY clock for the moment */
917 clk_disable(priv
->ephy_clk
);
922 static void nuport_mac_ethtool_drvinfo(struct net_device
*dev
,
923 struct ethtool_drvinfo
*info
)
925 strncpy(info
->driver
, "nuport-mac", sizeof(info
->driver
));
926 strncpy(info
->version
, "0.1", sizeof(info
->version
));
927 strncpy(info
->fw_version
, "N/A", sizeof(info
->fw_version
));
928 strncpy(info
->bus_info
, "internal", sizeof(info
->bus_info
));
930 info
->testinfo_len
= 0;
931 info
->regdump_len
= 0;
932 info
->eedump_len
= 0;
935 static int nuport_mac_ethtool_get_settings(struct net_device
*dev
,
936 struct ethtool_cmd
*cmd
)
938 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
941 return phy_ethtool_gset(priv
->phydev
, cmd
);
946 static int nuport_mac_ethtool_set_settings(struct net_device
*dev
,
947 struct ethtool_cmd
*cmd
)
949 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
952 return phy_ethtool_sset(priv
->phydev
, cmd
);
957 static void nuport_mac_set_msglevel(struct net_device
*dev
, u32 msg_level
)
959 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
961 priv
->msg_level
= msg_level
;
964 static u32
nuport_mac_get_msglevel(struct net_device
*dev
)
966 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
968 return priv
->msg_level
;
971 static const struct ethtool_ops nuport_mac_ethtool_ops
= {
972 .get_drvinfo
= nuport_mac_ethtool_drvinfo
,
973 .get_link
= ethtool_op_get_link
,
974 .get_settings
= nuport_mac_ethtool_get_settings
,
975 .set_settings
= nuport_mac_ethtool_set_settings
,
976 .set_msglevel
= nuport_mac_set_msglevel
,
977 .get_msglevel
= nuport_mac_get_msglevel
,
980 static const struct net_device_ops nuport_mac_ops
= {
981 .ndo_open
= nuport_mac_open
,
982 .ndo_stop
= nuport_mac_close
,
983 .ndo_start_xmit
= nuport_mac_start_xmit
,
984 .ndo_change_mtu
= eth_change_mtu
,
985 .ndo_validate_addr
= eth_validate_addr
,
986 .ndo_set_mac_address
= nuport_mac_change_mac_address
,
987 .ndo_tx_timeout
= nuport_mac_tx_timeout
,
990 static int __init
nuport_mac_probe(struct platform_device
*pdev
)
992 struct net_device
*dev
;
993 struct nuport_mac_priv
*priv
= NULL
;
994 struct resource
*regs
, *dma
;
996 int rx_irq
, tx_irq
, link_irq
;
998 const unsigned int *intspec
;
1000 dev
= alloc_etherdev(sizeof(struct nuport_mac_priv
));
1002 dev_err(&pdev
->dev
, "no memory for net_device\n");
1006 regs
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1007 dma
= platform_get_resource(pdev
, IORESOURCE_MEM
, 1);
1008 if (!regs
|| !dma
) {
1009 dev_err(&pdev
->dev
, "failed to get regs resources\n");
1014 rx_irq
= platform_get_irq(pdev
, 0);
1015 tx_irq
= platform_get_irq(pdev
, 1);
1016 link_irq
= platform_get_irq(pdev
, 2);
1017 if (rx_irq
< 0 || tx_irq
< 0 || link_irq
< 0) {
1022 platform_set_drvdata(pdev
, dev
);
1023 SET_NETDEV_DEV(dev
, &pdev
->dev
);
1024 priv
= netdev_priv(dev
);
1027 spin_lock_init(&priv
->lock
);
1029 intspec
= of_get_property(pdev
->dev
.of_node
,
1030 "nuport-mac,buffer-shifting", NULL
);
1032 priv
->buffer_shifting_len
= 0;
1034 priv
->buffer_shifting_len
= 2;
1036 priv
->mac_base
= devm_ioremap(&pdev
->dev
,
1037 regs
->start
, resource_size(regs
));
1038 if (!priv
->mac_base
) {
1039 dev_err(&pdev
->dev
, "failed to remap regs\n");
1044 priv
->dma_base
= devm_ioremap(&pdev
->dev
,
1045 dma
->start
, resource_size(dma
));
1046 if (!priv
->dma_base
) {
1047 dev_err(&pdev
->dev
, "failed to remap dma-regs\n");
1052 priv
->emac_clk
= clk_get(&pdev
->dev
, "emac");
1053 if (IS_ERR_OR_NULL(priv
->emac_clk
)) {
1054 dev_err(&pdev
->dev
, "failed to get emac clk\n");
1055 ret
= PTR_ERR(priv
->emac_clk
);
1059 priv
->ephy_clk
= clk_get(&pdev
->dev
, "ephy");
1060 if (IS_ERR_OR_NULL(priv
->ephy_clk
)) {
1061 dev_err(&pdev
->dev
, "failed to get ephy clk\n");
1062 ret
= PTR_ERR(priv
->ephy_clk
);
1066 priv
->link_irq
= link_irq
;
1067 priv
->rx_irq
= rx_irq
;
1068 priv
->tx_irq
= tx_irq
;
1069 priv
->msg_level
= NETIF_MSG_DRV
| NETIF_MSG_PROBE
| NETIF_MSG_LINK
;
1070 dev
->netdev_ops
= &nuport_mac_ops
;
1071 dev
->ethtool_ops
= &nuport_mac_ethtool_ops
;
1072 dev
->watchdog_timeo
= HZ
;
1073 dev
->flags
= IFF_BROADCAST
; /* Supports Broadcast */
1074 dev
->tx_queue_len
= TX_RING_SIZE
/ 2;
1076 netif_napi_add(dev
, &priv
->napi
, nuport_mac_poll
, 64);
1078 priv
->mii_bus
= mdiobus_alloc();
1079 if (!priv
->mii_bus
) {
1080 dev_err(&pdev
->dev
, "mii bus allocation failed\n");
1084 priv
->mii_bus
->priv
= dev
;
1085 priv
->mii_bus
->read
= nuport_mac_mii_read
;
1086 priv
->mii_bus
->write
= nuport_mac_mii_write
;
1087 priv
->mii_bus
->reset
= nuport_mac_mii_reset
;
1088 priv
->mii_bus
->name
= "nuport-mac-mii";
1089 priv
->mii_bus
->phy_mask
= (1 << 0);
1090 snprintf(priv
->mii_bus
->id
, MII_BUS_ID_SIZE
, "%s", pdev
->name
);
1091 priv
->mii_bus
->irq
= kzalloc(PHY_MAX_ADDR
* sizeof(int), GFP_KERNEL
);
1092 if (!priv
->mii_bus
->irq
) {
1093 dev_err(&pdev
->dev
, "failed to allocate mii_bus irqs\n");
1098 /* We support PHY interrupts routed back to the MAC */
1099 for (i
= 0; i
< PHY_MAX_ADDR
; i
++)
1100 priv
->mii_bus
->irq
[i
] = PHY_IGNORE_INTERRUPT
;
1102 ret
= mdiobus_register(priv
->mii_bus
);
1104 dev_err(&pdev
->dev
, "failed to register mii_bus\n");
1108 ret
= nuport_mac_mii_probe(dev
);
1110 dev_err(&pdev
->dev
, "failed to probe MII bus\n");
1111 goto out_mdio_unregister
;
1114 ret
= register_netdev(dev
);
1116 dev_err(&pdev
->dev
, "failed to register net_device\n");
1117 goto out_mdio_probe
;
1120 /* read existing mac address */
1121 nuport_mac_read_mac_address(dev
);
1123 dev_info(&pdev
->dev
, "registered (MAC: %pM)\n", dev
->dev_addr
);
1128 phy_disconnect(priv
->phydev
);
1129 out_mdio_unregister
:
1130 mdiobus_unregister(priv
->mii_bus
);
1132 kfree(priv
->mii_bus
->irq
);
1134 mdiobus_free(priv
->mii_bus
);
1136 platform_set_drvdata(pdev
, NULL
);
1138 clk_put(priv
->ephy_clk
);
1139 clk_put(priv
->emac_clk
);
1141 platform_set_drvdata(pdev
, NULL
);
1145 static int nuport_mac_remove(struct platform_device
*pdev
)
1147 struct net_device
*dev
= platform_get_drvdata(pdev
);
1148 struct nuport_mac_priv
*priv
= netdev_priv(dev
);
1150 unregister_netdev(dev
);
1151 phy_disconnect(priv
->phydev
);
1152 mdiobus_unregister(priv
->mii_bus
);
1153 kfree(priv
->mii_bus
->irq
);
1154 mdiobus_free(priv
->mii_bus
);
1155 clk_put(priv
->ephy_clk
);
1156 clk_put(priv
->emac_clk
);
1159 platform_set_drvdata(pdev
, NULL
);
1164 static struct of_device_id nuport_eth_ids
[] __initdata
= {
1165 {.compatible
= "moschip,nuport-mac",},
1169 static struct platform_driver nuport_eth_driver
= {
1171 .name
= "nuport-mac",
1172 .owner
= THIS_MODULE
,
1173 .of_match_table
= nuport_eth_ids
,
1175 .probe
= nuport_mac_probe
,
1176 .remove
= __devexit_p(nuport_mac_remove
),
1179 module_platform_driver(nuport_eth_driver
);
1181 MODULE_AUTHOR("Moschip Semiconductors Ltd.");
1182 MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver");
1183 MODULE_LICENSE("GPL");