Root/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c

1/*
2 * Moschip MCS8140 Ethernet MAC driver
3 *
4 * Copyright (C) 2003, Moschip Semiconductors
5 * Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
6 *
7 * Licensed under GPLv2
8 */
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>
18#include <linux/io.h>
19#include <linux/interrupt.h>
20#include <linux/platform_device.h>
21#include <linux/of.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>
27
28#include <asm/unaligned.h>
29#include <asm/sizes.h>
30
31/* Hardware registers */
32#define MAC_BASE_ADDR ((priv->mac_base))
33
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)
59
60#define DMA_CHAN_WIDTH 32
61#define DMA_RX_CHAN 0
62#define DMA_TX_CHAN 2
63
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)
76
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)
97
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)
103
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) | \
108            /* Unsup Missed */\
109            (1<<26) | (0<<31))
110#define TX_RING_SIZE 30
111#define RX_RING_SIZE 30
112
113static inline u32 nuport_mac_readl(void __iomem *reg)
114{
115    return readl_relaxed(reg);
116}
117
118static inline u8 nuport_mac_readb(void __iomem *reg)
119{
120    return readb_relaxed(reg);
121}
122
123static inline void nuport_mac_writel(u32 value, void __iomem *reg)
124{
125    writel_relaxed(value, reg);
126}
127
128static inline void nuport_mac_writeb(u8 value, void __iomem *reg)
129{
130    writel_relaxed(value, reg);
131}
132
133/* MAC private data */
134struct nuport_mac_priv {
135    spinlock_t lock;
136
137    void __iomem *mac_base;
138    void __iomem *dma_base;
139
140    int rx_irq;
141    int tx_irq;
142    int link_irq;
143    struct clk *emac_clk;
144    struct clk *ephy_clk;
145
146    /* Transmit buffers */
147    struct sk_buff *tx_skb[TX_RING_SIZE];
148    dma_addr_t tx_addr;
149    unsigned int valid_txskb[TX_RING_SIZE];
150    unsigned int cur_tx;
151    unsigned int dma_tx;
152    unsigned int tx_full;
153
154    /* Receive buffers */
155    struct sk_buff *rx_skb[RX_RING_SIZE];
156    dma_addr_t rx_addr;
157    unsigned int irq_rxskb[RX_RING_SIZE];
158    int pkt_len[RX_RING_SIZE];
159    unsigned int cur_rx;
160    unsigned int dma_rx;
161    unsigned int rx_full;
162
163    unsigned int first_pkt;
164
165    /* Private data */
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;
171    int old_link;
172    int old_duplex;
173    u32 msg_level;
174    unsigned int buffer_shifting_len;
175};
176
177static inline int nuport_mac_mii_busy_wait(struct nuport_mac_priv *priv)
178{
179    unsigned long curr;
180    unsigned long finish = jiffies + 3 * HZ;
181
182    do {
183        curr = jiffies;
184        if (!(nuport_mac_readl(MII_ADDR_REG) & MII_BUSY))
185            return 0;
186        cpu_relax();
187    } while (!time_after_eq(curr, finish));
188
189    return -EBUSY;
190}
191
192/* Read from PHY registers */
193static int nuport_mac_mii_read(struct mii_bus *bus,
194                int mii_id, int regnum)
195{
196    struct net_device *dev = bus->priv;
197    struct nuport_mac_priv *priv = netdev_priv(dev);
198    int ret;
199    u32 val = 0;
200
201    ret = nuport_mac_mii_busy_wait(priv);
202    if (ret)
203        return ret;
204
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);
208    if (ret)
209        return ret;
210
211    return nuport_mac_readl(MII_DATA_REG);
212}
213
214static int nuport_mac_mii_write(struct mii_bus *bus, int mii_id,
215                int regnum, u16 value)
216{
217    struct net_device *dev = bus->priv;
218    struct nuport_mac_priv *priv = netdev_priv(dev);
219    int ret;
220    u32 val = 0;
221
222    ret = nuport_mac_mii_busy_wait(priv);
223    if (ret)
224        return ret;
225
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);
230
231    return nuport_mac_mii_busy_wait(priv);
232}
233
234static int nuport_mac_mii_reset(struct mii_bus *bus)
235{
236    return 0;
237}
238
239static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
240                    struct sk_buff *skb)
241{
242    u32 reg;
243    unsigned int timeout = 2048;
244
245    while (timeout--) {
246        reg = nuport_mac_readl(TX_START_DMA);
247        if (!(reg & TX_DMA_ENABLE)) {
248            netdev_dbg(priv->dev, "dma ready\n");
249            break;
250        }
251        cpu_relax();
252    }
253
254    if (!timeout)
255        return -EBUSY;
256
257    priv->tx_addr = dma_map_single(&priv->pdev->dev, skb->data,
258            skb->len, DMA_TO_DEVICE);
259    if (dma_mapping_error(&priv->pdev->dev, priv->tx_addr))
260        return -ENOMEM;
261
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);
266    wmb();
267    reg = TX_DMA_ENABLE | TX_DMA_START_FRAME | TX_DMA_END_FRAME;
268    nuport_mac_writel(reg, TX_START_DMA);
269
270    return 0;
271}
272
273static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv)
274{
275    u32 reg;
276
277    reg = nuport_mac_readl(TX_START_DMA);
278    reg |= TX_DMA_RESET;
279    nuport_mac_writel(reg, TX_START_DMA);
280}
281
282static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
283                    struct sk_buff *skb)
284{
285    u32 reg;
286    unsigned int timeout = 2048;
287
288    while (timeout--) {
289        reg = nuport_mac_readl(RX_START_DMA);
290        if (!(reg & RX_DMA_ENABLE)) {
291            netdev_dbg(priv->dev, "dma ready\n");
292            break;
293        }
294        cpu_relax();
295    }
296
297    if (!timeout)
298        return -EBUSY;
299
300    priv->rx_addr = dma_map_single(&priv->pdev->dev, skb->data,
301                RX_ALLOC_SIZE, DMA_FROM_DEVICE);
302    if (dma_mapping_error(&priv->pdev->dev, priv->rx_addr))
303        return -ENOMEM;
304
305    nuport_mac_writel(priv->rx_addr, RX_BUFFER_ADDR);
306    wmb();
307    nuport_mac_writel(RX_DMA_ENABLE, RX_START_DMA);
308
309    return 0;
310}
311
312static void nuport_mac_reset_rx_dma(struct nuport_mac_priv *priv)
313{
314    u32 reg;
315
316    reg = nuport_mac_readl(RX_START_DMA);
317    reg |= RX_DMA_RESET;
318    nuport_mac_writel(reg, RX_START_DMA);
319}
320
321/* I suppose this might do something, but I am not sure actually */
322static void nuport_mac_disable_rx_dma(struct nuport_mac_priv *priv)
323{
324    u32 reg;
325
326    reg = nuport_mac_readl(RX_DMA_ENH);
327    reg &= ~RX_DMA_INT_ENABLE;
328    nuport_mac_writel(reg, RX_DMA_ENH);
329}
330
331static void nuport_mac_enable_rx_dma(struct nuport_mac_priv *priv)
332{
333    u32 reg;
334
335    reg = nuport_mac_readl(RX_DMA_ENH);
336    reg |= RX_DMA_INT_ENABLE;
337    nuport_mac_writel(reg, RX_DMA_ENH);
338}
339
340/* Add packets to the transmit queue */
341static int nuport_mac_start_xmit(struct sk_buff *skb, struct net_device *dev)
342{
343    unsigned long flags;
344    struct nuport_mac_priv *priv = netdev_priv(dev);
345    int ret;
346
347    if (netif_queue_stopped(dev)) {
348        netdev_warn(dev, "netif queue was stopped, restarting\n");
349        netif_start_queue(dev);
350    }
351
352    spin_lock_irqsave(&priv->lock, flags);
353    if (priv->first_pkt) {
354        ret = nuport_mac_start_tx_dma(priv, skb);
355        if (ret) {
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;
360        }
361        priv->first_pkt = 0;
362    }
363
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;
368    priv->cur_tx++;
369    dev->trans_start = jiffies;
370
371    if (priv->cur_tx >= TX_RING_SIZE)
372        priv->cur_tx = 0;
373
374    spin_unlock_irqrestore(&priv->lock, flags);
375
376    if (priv->valid_txskb[priv->cur_tx]) {
377        priv->tx_full = 1;
378        netdev_err(dev, "stopping queue\n");
379        netif_stop_queue(dev);
380    }
381
382    return NETDEV_TX_OK;
383}
384
385static void nuport_mac_adjust_link(struct net_device *dev)
386{
387    struct nuport_mac_priv *priv = netdev_priv(dev);
388    struct phy_device *phydev = priv->phydev;
389    unsigned int status_changed = 0;
390    u32 reg;
391
392    BUG_ON(!phydev);
393
394    if (priv->old_link != phydev->link) {
395        status_changed = 1;
396        priv->old_link = phydev->link;
397    }
398
399    if (phydev->link && (priv->old_duplex != phydev->duplex)) {
400        reg = nuport_mac_readl(CTRL_REG);
401        if (phydev->duplex == DUPLEX_FULL)
402            reg |= DUPLEX_FULL;
403        else
404            reg &= ~DUPLEX_FULL;
405        nuport_mac_writel(reg, CTRL_REG);
406
407        status_changed = 1;
408        priv->old_duplex = phydev->duplex;
409    }
410
411    if (!status_changed)
412        return;
413
414    pr_info("%s: link %s", dev->name, phydev->link ?
415        "UP" : "DOWN");
416    if (phydev->link) {
417        pr_cont(" - %d/%s", phydev->speed,
418        phydev->duplex == DUPLEX_FULL ? "full" : "half");
419    }
420    pr_cont("\n");
421}
422
423static irqreturn_t nuport_mac_link_interrupt(int irq, void *dev_id)
424{
425    struct net_device *dev = dev_id;
426    struct nuport_mac_priv *priv = netdev_priv(dev);
427    u32 reg;
428    u8 phy_addr;
429    unsigned long flags;
430    irqreturn_t ret = IRQ_HANDLED;
431
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);
435
436    if (phy_addr != priv->phydev->addr) {
437        netdev_err(dev, "spurious PHY irq (phy: %d)\n", phy_addr);
438        ret = IRQ_NONE;
439        goto out;
440    }
441
442    priv->phydev->link = (reg & LINK_UP);
443    nuport_mac_adjust_link(dev);
444
445out:
446    spin_unlock_irqrestore(&priv->lock, flags);
447    return ret;
448}
449
450static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
451{
452    struct net_device *dev = (struct net_device *)dev_id;
453    struct nuport_mac_priv *priv = netdev_priv(dev);
454    struct sk_buff *skb;
455    unsigned long flags;
456    int ret;
457    u32 reg;
458
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);
465
466        if (reg & 1)
467            dev->stats.tx_errors++;
468    } else
469        netdev_dbg(dev, "no status word: %08x\n", reg);
470
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,
475                DMA_TO_DEVICE);
476    dev_kfree_skb_irq(skb);
477
478    priv->dma_tx++;
479    if (priv->dma_tx >= TX_RING_SIZE)
480        priv->dma_tx = 0;
481
482    if (!priv->valid_txskb[priv->dma_tx])
483        priv->first_pkt = 1;
484    else {
485        ret = nuport_mac_start_tx_dma(priv, priv->tx_skb[priv->dma_tx]);
486        if (ret)
487            netdev_err(dev, "failed to restart TX dma\n");
488    }
489
490    if (priv->tx_full) {
491        netdev_dbg(dev, "restarting transmit queue\n");
492        netif_wake_queue(dev);
493        priv->tx_full = 0;
494    }
495
496    spin_unlock_irqrestore(&priv->lock, flags);
497
498    return IRQ_HANDLED;
499}
500
501static unsigned int nuport_mac_has_work(struct nuport_mac_priv *priv)
502{
503    unsigned int i;
504
505    for (i = 0; i < RX_RING_SIZE; i++)
506        if (priv->rx_skb[i])
507            return 1;
508
509    return 0;
510}
511
512static irqreturn_t nuport_mac_rx_interrupt(int irq, void *dev_id)
513{
514    struct net_device *dev = (struct net_device *)dev_id;
515    struct nuport_mac_priv *priv = netdev_priv(dev);
516    unsigned long flags;
517    int ret;
518
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;
523        priv->dma_rx++;
524
525        if (priv->dma_rx >= RX_RING_SIZE)
526            priv->dma_rx = 0;
527    } else
528        priv->rx_full = 0;
529
530    if (priv->irq_rxskb[priv->dma_rx] == 1) {
531        ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[priv->dma_rx]);
532        if (ret)
533            netdev_err(dev, "failed to start rx dma\n");
534    } else {
535        priv->rx_full = 1;
536        netdev_dbg(dev, "RX ring full\n");
537    }
538
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);
543    }
544    spin_unlock_irqrestore(&priv->lock, flags);
545
546    return IRQ_HANDLED;
547}
548
549/* Process received packets in tasklet */
550static int nuport_mac_rx(struct net_device *dev, int limit)
551{
552    struct nuport_mac_priv *priv = netdev_priv(dev);
553    struct sk_buff *skb;
554    int len, status;
555    int count = 0;
556
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];
560
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;
564
565        /* Get packet status */
566        status = get_unaligned((u32 *) (skb->data + len));
567
568        dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len,
569                DMA_FROM_DEVICE);
570
571        /* packet filter failed */
572        if (!(status & (1 << 30))) {
573            dev_kfree_skb_irq(skb);
574            goto exit;
575        }
576
577        /* missed frame */
578        if (status & (1 << 31)) {
579            dev->stats.rx_missed_errors++;
580            dev_kfree_skb_irq(skb);
581            goto exit;
582        }
583
584        /* Not ethernet type */
585        if ((!(status & (1 << 18))) || (status & ERROR_FILTER_MASK))
586            dev->stats.rx_errors++;
587
588        if (len > MAX_ETH_FRAME_SIZE) {
589            dev_kfree_skb_irq(skb);
590            goto exit;
591        } else
592            skb_put(skb, len);
593
594        skb->protocol = eth_type_trans(skb, dev);
595        dev->stats.rx_packets++;
596
597        if (status & (1 << 29))
598            skb->pkt_type = PACKET_OTHERHOST;
599        if (status & (1 << 27))
600            skb->pkt_type = PACKET_MULTICAST;
601        if (status & (1 << 28))
602            skb->pkt_type = PACKET_BROADCAST;
603
604        skb->ip_summed = CHECKSUM_UNNECESSARY;
605
606        /* Pass the received packet to network layer */
607        status = netif_receive_skb(skb);
608        if (status != NET_RX_DROP)
609            dev->stats.rx_bytes += len - 4; /* Without CRC */
610        else
611            dev->stats.rx_dropped++;
612
613        dev->last_rx = jiffies;
614
615exit:
616        skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
617        if (!skb)
618            goto out;
619
620        skb_reserve(skb, RX_SKB_HEADROOM);
621        priv->rx_skb[priv->cur_rx] = skb;
622        priv->irq_rxskb[priv->cur_rx] = 1;
623        priv->cur_rx++;
624
625        if (priv->cur_rx >= RX_RING_SIZE)
626            priv->cur_rx = 0;
627        count++;
628    }
629out:
630    return count;
631}
632
633static int nuport_mac_poll(struct napi_struct *napi, int budget)
634{
635    struct nuport_mac_priv *priv =
636        container_of(napi, struct nuport_mac_priv, napi);
637    struct net_device *dev = priv->dev;
638    int work_done;
639
640    work_done = nuport_mac_rx(dev, budget);
641
642    if (work_done < budget) {
643        napi_complete(napi);
644        nuport_mac_enable_rx_dma(priv);
645    }
646
647    return work_done;
648}
649
650static void nuport_mac_init_tx_ring(struct nuport_mac_priv *priv)
651{
652    int i;
653
654    priv->cur_tx = priv->dma_tx = priv->tx_full = 0;
655    for (i = 0; i < TX_RING_SIZE; i++) {
656        priv->tx_skb[i] = NULL;
657        priv->valid_txskb[i] = 0;
658    }
659    priv->first_pkt = 1;
660}
661
662static int nuport_mac_init_rx_ring(struct net_device *dev)
663{
664    struct nuport_mac_priv *priv = netdev_priv(dev);
665    struct sk_buff *skb;
666    int i;
667
668    priv->cur_rx = priv->dma_rx = priv->rx_full = 0;
669
670    for (i = 0; i < RX_RING_SIZE; i++) {
671        skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
672        if (!skb)
673            return -ENOMEM;
674        skb_reserve(skb, RX_SKB_HEADROOM);
675        priv->rx_skb[i] = skb;
676        priv->irq_rxskb[i] = 1;
677    }
678
679    return 0;
680}
681
682static void nuport_mac_free_rx_ring(struct nuport_mac_priv *priv)
683{
684    int i;
685
686    for (i = 0; i < RX_RING_SIZE; i++) {
687        if (!priv->rx_skb[i])
688            continue;
689
690        dev_kfree_skb(priv->rx_skb[i]);
691        priv->rx_skb[i] = NULL;
692    }
693
694    if (priv->rx_addr)
695        dma_unmap_single(&priv->pdev->dev, priv->rx_addr, RX_ALLOC_SIZE,
696                DMA_TO_DEVICE);
697}
698
699static void nuport_mac_read_mac_address(struct net_device *dev)
700{
701    struct nuport_mac_priv *priv = netdev_priv(dev);
702    int i;
703
704    for (i = 0; i < 4; i++)
705        dev->dev_addr[i] = nuport_mac_readb(MAC_ADDR_LOW_REG + i);
706    dev->dev_addr[4] = nuport_mac_readb(MAC_ADDR_HIGH_REG);
707    dev->dev_addr[5] = nuport_mac_readb(MAC_ADDR_HIGH_REG + 1);
708
709    if (!is_valid_ether_addr(dev->dev_addr)) {
710        dev_info(&priv->pdev->dev, "using random address\n");
711        random_ether_addr(dev->dev_addr);
712    }
713}
714
715static int nuport_mac_change_mac_address(struct net_device *dev, void *mac_addr)
716{
717    struct sockaddr *addr = mac_addr;
718    struct nuport_mac_priv *priv = netdev_priv(dev);
719    unsigned long *temp = (unsigned long *)dev->dev_addr;
720    u32 high, low;
721
722    if (netif_running(dev))
723        return -EBUSY;
724
725    memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
726
727    spin_lock_irq(&priv->lock);
728
729    nuport_mac_writel(*temp, MAC_ADDR_LOW_REG);
730    temp = (unsigned long *)(dev->dev_addr + 4);
731    nuport_mac_writel(*temp, MAC_ADDR_HIGH_REG);
732
733    low = nuport_mac_readl(MAC_ADDR_LOW_REG);
734    high = nuport_mac_readl(MAC_ADDR_HIGH_REG);
735
736    spin_unlock_irq(&priv->lock);
737
738    return 0;
739}
740
741static int nuport_mac_open(struct net_device *dev)
742{
743    int ret;
744    struct nuport_mac_priv *priv = netdev_priv(dev);
745    unsigned long flags;
746    u32 reg = 0;
747
748    ret = clk_enable(priv->emac_clk);
749    if (ret) {
750        netdev_err(dev, "failed to enable EMAC clock\n");
751        return ret;
752    }
753
754    /* Set MAC into full duplex mode by default */
755    reg |= RX_ENABLE | TX_ENABLE;
756    reg |= DEFER_CHECK | STRIP_PAD | DRTRY_DISABLE;
757    reg |= FULL_DUPLEX | HBD_DISABLE;
758    nuport_mac_writel(reg, CTRL_REG);
759
760    /* set mac address in hardware in case it was not already */
761    nuport_mac_change_mac_address(dev, dev->dev_addr);
762
763    ret = request_irq(priv->link_irq, &nuport_mac_link_interrupt,
764                0, dev->name, dev);
765    if (ret) {
766        netdev_err(dev, "unable to request link interrupt\n");
767        goto out_emac_clk;
768    }
769
770    ret = request_irq(priv->tx_irq, &nuport_mac_tx_interrupt,
771                0, dev->name, dev);
772    if (ret) {
773        netdev_err(dev, "unable to request rx interrupt\n");
774        goto out_link_irq;
775    }
776
777    /* Enable link interrupt monitoring for our PHY address */
778    reg = LINK_INT_EN | (priv->phydev->addr << LINK_PHY_ADDR_SHIFT);
779    /* MII_BMSR register to be watched */
780    reg |= (1 << LINK_PHY_REG_SHIFT);
781    /* BMSR_STATUS to be watched in particular */
782    reg |= (2 << LINK_BIT_UP_SHIFT);
783
784    spin_lock_irqsave(&priv->lock, flags);
785    nuport_mac_writel(reg, LINK_INT_CSR);
786    nuport_mac_writel(LINK_POLL_MASK, LINK_INT_POLL_TIME);
787    spin_unlock_irqrestore(&priv->lock, flags);
788
789    phy_start(priv->phydev);
790
791    ret = request_irq(priv->rx_irq, &nuport_mac_rx_interrupt,
792                0, dev->name, dev);
793    if (ret) {
794        netdev_err(dev, "unable to request tx interrupt\n");
795        goto out_tx_irq;
796    }
797
798    netif_start_queue(dev);
799
800    nuport_mac_init_tx_ring(priv);
801
802    ret = nuport_mac_init_rx_ring(dev);
803    if (ret) {
804        netdev_err(dev, "rx ring init failed\n");
805        goto out_rx_skb;
806    }
807
808    nuport_mac_reset_tx_dma(priv);
809    nuport_mac_reset_rx_dma(priv);
810
811    /* Start RX DMA */
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);
815
816    napi_enable(&priv->napi);
817
818    return ret;
819
820out_rx_skb:
821    nuport_mac_free_rx_ring(priv);
822    free_irq(priv->rx_irq, dev);
823out_tx_irq:
824    free_irq(priv->tx_irq, dev);
825out_link_irq:
826    free_irq(priv->link_irq, dev);
827out_emac_clk:
828    clk_disable(priv->emac_clk);
829    return ret;
830}
831
832static int nuport_mac_close(struct net_device *dev)
833{
834    u32 reg;
835    struct nuport_mac_priv *priv = netdev_priv(dev);
836
837    spin_lock_irq(&priv->lock);
838    reg = nuport_mac_readl(CTRL_REG);
839    reg &= ~(RX_ENABLE | TX_ENABLE);
840    nuport_mac_writel(reg, CTRL_REG);
841
842    napi_disable(&priv->napi);
843    netif_stop_queue(dev);
844
845    free_irq(priv->link_irq, dev);
846    /* disable PHY polling */
847    nuport_mac_writel(0, LINK_INT_CSR);
848    nuport_mac_writel(0, LINK_INT_POLL_TIME);
849    phy_stop(priv->phydev);
850
851    free_irq(priv->tx_irq, dev);
852    free_irq(priv->rx_irq, dev);
853    spin_unlock_irq(&priv->lock);
854
855    nuport_mac_free_rx_ring(priv);
856
857    clk_disable(priv->emac_clk);
858
859    return 0;
860}
861
862static void nuport_mac_tx_timeout(struct net_device *dev)
863{
864    struct nuport_mac_priv *priv = netdev_priv(dev);
865    unsigned int i;
866
867    netdev_warn(dev, "transmit timeout, attempting recovery\n");
868
869    netdev_info(dev, "TX DMA regs\n");
870    for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
871        netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(TX_DMA_BASE + i));
872    netdev_info(dev, "RX DMA regs\n");
873    for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
874        netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(RX_DMA_BASE + i));
875
876    nuport_mac_init_tx_ring(priv);
877    nuport_mac_reset_tx_dma(priv);
878
879    netif_wake_queue(dev);
880}
881
882static int nuport_mac_mii_probe(struct net_device *dev)
883{
884    struct nuport_mac_priv *priv = netdev_priv(dev);
885    struct phy_device *phydev = NULL;
886    int ret;
887
888    ret = clk_enable(priv->ephy_clk);
889    if (ret) {
890        netdev_err(dev, "unable to enable ePHY clk\n");
891        return ret;
892    }
893
894    phydev = phy_find_first(priv->mii_bus);
895    if (!phydev) {
896        netdev_err(dev, "no PHYs found\n");
897        ret = -ENODEV;
898        goto out;
899    }
900
901    phydev = phy_connect(dev, dev_name(&phydev->dev),
902            nuport_mac_adjust_link, 0,
903            PHY_INTERFACE_MODE_MII);
904    if (IS_ERR(phydev)) {
905        netdev_err(dev, "could not attach PHY\n");
906        ret = PTR_ERR(phydev);
907        goto out;
908    }
909
910    phydev->supported &= PHY_BASIC_FEATURES;
911    phydev->advertising = phydev->supported;
912    priv->phydev = phydev;
913    priv->old_link = 1;
914    priv->old_duplex = DUPLEX_FULL;
915
916    dev_info(&priv->pdev->dev, "attached PHY driver [%s] "
917        "(mii_bus:phy_addr=%d)\n",
918        phydev->drv->name, phydev->addr);
919
920    return 0;
921
922out:
923    /* disable the Ethernet PHY clock for the moment */
924    clk_disable(priv->ephy_clk);
925
926    return ret;
927}
928
929static void nuport_mac_ethtool_drvinfo(struct net_device *dev,
930                    struct ethtool_drvinfo *info)
931{
932    strncpy(info->driver, "nuport-mac", sizeof(info->driver));
933    strncpy(info->version, "0.1", sizeof(info->version));
934    strncpy(info->fw_version, "N/A", sizeof(info->fw_version));
935    strncpy(info->bus_info, "internal", sizeof(info->bus_info));
936    info->n_stats = 0;
937    info->testinfo_len = 0;
938    info->regdump_len = 0;
939    info->eedump_len = 0;
940}
941
942static int nuport_mac_ethtool_get_settings(struct net_device *dev,
943                    struct ethtool_cmd *cmd)
944{
945    struct nuport_mac_priv *priv = netdev_priv(dev);
946
947    if (priv->phydev)
948        return phy_ethtool_gset(priv->phydev, cmd);
949
950    return -EINVAL;
951}
952
953static int nuport_mac_ethtool_set_settings(struct net_device *dev,
954                    struct ethtool_cmd *cmd)
955{
956    struct nuport_mac_priv *priv = netdev_priv(dev);
957
958    if (priv->phydev)
959        return phy_ethtool_sset(priv->phydev, cmd);
960
961    return -EINVAL;
962}
963
964static void nuport_mac_set_msglevel(struct net_device *dev, u32 msg_level)
965{
966    struct nuport_mac_priv *priv = netdev_priv(dev);
967
968    priv->msg_level = msg_level;
969}
970
971static u32 nuport_mac_get_msglevel(struct net_device *dev)
972{
973    struct nuport_mac_priv *priv = netdev_priv(dev);
974
975    return priv->msg_level;
976}
977
978static const struct ethtool_ops nuport_mac_ethtool_ops = {
979    .get_drvinfo = nuport_mac_ethtool_drvinfo,
980    .get_link = ethtool_op_get_link,
981    .get_settings = nuport_mac_ethtool_get_settings,
982    .set_settings = nuport_mac_ethtool_set_settings,
983    .set_msglevel = nuport_mac_set_msglevel,
984    .get_msglevel = nuport_mac_get_msglevel,
985};
986
987static const struct net_device_ops nuport_mac_ops = {
988    .ndo_open = nuport_mac_open,
989    .ndo_stop = nuport_mac_close,
990    .ndo_start_xmit = nuport_mac_start_xmit,
991    .ndo_change_mtu = eth_change_mtu,
992    .ndo_validate_addr = eth_validate_addr,
993    .ndo_set_mac_address = nuport_mac_change_mac_address,
994    .ndo_tx_timeout = nuport_mac_tx_timeout,
995};
996
997static int __init nuport_mac_probe(struct platform_device *pdev)
998{
999    struct net_device *dev;
1000    struct nuport_mac_priv *priv = NULL;
1001    struct resource *regs, *dma;
1002    int ret = 0;
1003    int rx_irq, tx_irq, link_irq;
1004    int i;
1005    const unsigned int *intspec;
1006
1007    dev = alloc_etherdev(sizeof(struct nuport_mac_priv));
1008    if (!dev) {
1009        dev_err(&pdev->dev, "no memory for net_device\n");
1010        return -ENOMEM;
1011    }
1012
1013    regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1014    dma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1015    if (!regs || !dma) {
1016        dev_err(&pdev->dev, "failed to get regs resources\n");
1017        ret = -ENODEV;
1018        goto out;
1019    }
1020
1021    rx_irq = platform_get_irq(pdev, 0);
1022    tx_irq = platform_get_irq(pdev, 1);
1023    link_irq = platform_get_irq(pdev, 2);
1024    if (rx_irq < 0 || tx_irq < 0 || link_irq < 0) {
1025        ret = -ENODEV;
1026        goto out;
1027    }
1028
1029    platform_set_drvdata(pdev, dev);
1030    SET_NETDEV_DEV(dev, &pdev->dev);
1031    priv = netdev_priv(dev);
1032    priv->pdev = pdev;
1033    priv->dev = dev;
1034    spin_lock_init(&priv->lock);
1035
1036    intspec = of_get_property(pdev->dev.of_node,
1037                "nuport-mac,buffer-shifting", NULL);
1038    if (!intspec)
1039        priv->buffer_shifting_len = 0;
1040    else
1041        priv->buffer_shifting_len = 2;
1042
1043    priv->mac_base = devm_ioremap(&pdev->dev,
1044                regs->start, resource_size(regs));
1045    if (!priv->mac_base) {
1046        dev_err(&pdev->dev, "failed to remap regs\n");
1047        ret = -ENOMEM;
1048        goto out_platform;
1049    }
1050
1051    priv->dma_base = devm_ioremap(&pdev->dev,
1052                dma->start, resource_size(dma));
1053    if (!priv->dma_base) {
1054        dev_err(&pdev->dev, "failed to remap dma-regs\n");
1055        ret = -ENOMEM;
1056        goto out_platform;
1057    }
1058
1059    priv->emac_clk = clk_get(&pdev->dev, "emac");
1060    if (IS_ERR_OR_NULL(priv->emac_clk)) {
1061        dev_err(&pdev->dev, "failed to get emac clk\n");
1062        ret = PTR_ERR(priv->emac_clk);
1063        goto out_platform;
1064    }
1065
1066    priv->ephy_clk = clk_get(&pdev->dev, "ephy");
1067    if (IS_ERR_OR_NULL(priv->ephy_clk)) {
1068        dev_err(&pdev->dev, "failed to get ephy clk\n");
1069        ret = PTR_ERR(priv->ephy_clk);
1070        goto out_platform;
1071    }
1072
1073    priv->link_irq = link_irq;
1074    priv->rx_irq = rx_irq;
1075    priv->tx_irq = tx_irq;
1076    priv->msg_level = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK;
1077    dev->netdev_ops = &nuport_mac_ops;
1078    dev->ethtool_ops = &nuport_mac_ethtool_ops;
1079    dev->watchdog_timeo = HZ;
1080    dev->flags = IFF_BROADCAST; /* Supports Broadcast */
1081    dev->tx_queue_len = TX_RING_SIZE / 2;
1082
1083    netif_napi_add(dev, &priv->napi, nuport_mac_poll, 64);
1084
1085    priv->mii_bus = mdiobus_alloc();
1086    if (!priv->mii_bus) {
1087        dev_err(&pdev->dev, "mii bus allocation failed\n");
1088        goto out;
1089    }
1090
1091    priv->mii_bus->priv = dev;
1092    priv->mii_bus->read = nuport_mac_mii_read;
1093    priv->mii_bus->write = nuport_mac_mii_write;
1094    priv->mii_bus->reset = nuport_mac_mii_reset;
1095    priv->mii_bus->name = "nuport-mac-mii";
1096    priv->mii_bus->phy_mask = (1 << 0);
1097    snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
1098    priv->mii_bus->irq = kzalloc(PHY_MAX_ADDR * sizeof(int), GFP_KERNEL);
1099    if (!priv->mii_bus->irq) {
1100        dev_err(&pdev->dev, "failed to allocate mii_bus irqs\n");
1101        ret = -ENOMEM;
1102        goto out_mdio;
1103    }
1104
1105    /* We support PHY interrupts routed back to the MAC */
1106    for (i = 0; i < PHY_MAX_ADDR; i++)
1107        priv->mii_bus->irq[i] = PHY_IGNORE_INTERRUPT;
1108
1109    ret = mdiobus_register(priv->mii_bus);
1110    if (ret) {
1111        dev_err(&pdev->dev, "failed to register mii_bus\n");
1112        goto out_mdio_irq;
1113    }
1114
1115    ret = nuport_mac_mii_probe(dev);
1116    if (ret) {
1117        dev_err(&pdev->dev, "failed to probe MII bus\n");
1118        goto out_mdio_unregister;
1119    }
1120
1121    ret = register_netdev(dev);
1122    if (ret) {
1123        dev_err(&pdev->dev, "failed to register net_device\n");
1124        goto out_mdio_probe;
1125    }
1126
1127    /* read existing mac address */
1128    nuport_mac_read_mac_address(dev);
1129
1130    dev_info(&pdev->dev, "registered (MAC: %pM)\n", dev->dev_addr);
1131
1132    return ret;
1133
1134out_mdio_probe:
1135    phy_disconnect(priv->phydev);
1136out_mdio_unregister:
1137    mdiobus_unregister(priv->mii_bus);
1138out_mdio_irq:
1139    kfree(priv->mii_bus->irq);
1140out_mdio:
1141    mdiobus_free(priv->mii_bus);
1142out_platform:
1143    platform_set_drvdata(pdev, NULL);
1144out:
1145    clk_put(priv->ephy_clk);
1146    clk_put(priv->emac_clk);
1147    free_netdev(dev);
1148    platform_set_drvdata(pdev, NULL);
1149    return ret;
1150}
1151
1152static int nuport_mac_remove(struct platform_device *pdev)
1153{
1154    struct net_device *dev = platform_get_drvdata(pdev);
1155    struct nuport_mac_priv *priv = netdev_priv(dev);
1156
1157    unregister_netdev(dev);
1158    phy_disconnect(priv->phydev);
1159    mdiobus_unregister(priv->mii_bus);
1160    kfree(priv->mii_bus->irq);
1161    mdiobus_free(priv->mii_bus);
1162    clk_put(priv->ephy_clk);
1163    clk_put(priv->emac_clk);
1164    free_netdev(dev);
1165
1166    platform_set_drvdata(pdev, NULL);
1167
1168    return 0;
1169}
1170
1171static struct of_device_id nuport_eth_ids[] __initdata = {
1172    {.compatible = "moschip,nuport-mac",},
1173    { /* sentinel */ },
1174};
1175
1176static struct platform_driver nuport_eth_driver = {
1177    .driver = {
1178        .name = "nuport-mac",
1179        .owner = THIS_MODULE,
1180        .of_match_table = nuport_eth_ids,
1181    },
1182    .probe = nuport_mac_probe,
1183    .remove = __devexit_p(nuport_mac_remove),
1184};
1185
1186module_platform_driver(nuport_eth_driver);
1187
1188MODULE_AUTHOR("Moschip Semiconductors Ltd.");
1189MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver");
1190MODULE_LICENSE("GPL");
1191

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