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        skb->dev = dev;
568
569        dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len,
570                DMA_FROM_DEVICE);
571
572        /* packet filter failed */
573        if (!(status & (1 << 30))) {
574            dev_kfree_skb_irq(skb);
575            goto exit;
576        }
577
578        /* missed frame */
579        if (status & (1 << 31)) {
580            dev->stats.rx_missed_errors++;
581            dev_kfree_skb_irq(skb);
582            goto exit;
583        }
584
585        /* Not ethernet type */
586        if ((!(status & (1 << 18))) || (status & ERROR_FILTER_MASK))
587            dev->stats.rx_errors++;
588
589        if (len > MAX_ETH_FRAME_SIZE) {
590            dev_kfree_skb_irq(skb);
591            goto exit;
592        } else
593            skb_put(skb, len);
594
595        skb->protocol = eth_type_trans(skb, dev);
596        dev->stats.rx_packets++;
597
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;
604
605        skb->ip_summed = CHECKSUM_UNNECESSARY;
606
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 */
611        else
612            dev->stats.rx_dropped++;
613
614        dev->last_rx = jiffies;
615
616exit:
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;
621        priv->cur_rx++;
622
623        if (priv->cur_rx >= RX_RING_SIZE)
624            priv->cur_rx = 0;
625        count++;
626    }
627
628    return count;
629}
630
631static int nuport_mac_poll(struct napi_struct *napi, int budget)
632{
633    struct nuport_mac_priv *priv =
634        container_of(napi, struct nuport_mac_priv, napi);
635    struct net_device *dev = priv->dev;
636    int work_done;
637
638    work_done = nuport_mac_rx(dev, budget);
639
640    if (work_done < budget) {
641        napi_complete(napi);
642        nuport_mac_enable_rx_dma(priv);
643    }
644
645    return work_done;
646}
647
648static void nuport_mac_init_tx_ring(struct nuport_mac_priv *priv)
649{
650    int i;
651
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;
656    }
657    priv->first_pkt = 1;
658}
659
660static int nuport_mac_init_rx_ring(struct net_device *dev)
661{
662    struct nuport_mac_priv *priv = netdev_priv(dev);
663    struct sk_buff *skb;
664    int i;
665
666    priv->cur_rx = priv->dma_rx = priv->rx_full = 0;
667
668    for (i = 0; i < RX_RING_SIZE; i++) {
669        skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
670        if (!skb)
671            return -ENOMEM;
672        skb_reserve(skb, RX_SKB_HEADROOM);
673        priv->rx_skb[i] = skb;
674        priv->irq_rxskb[i] = 1;
675    }
676
677    return 0;
678}
679
680static void nuport_mac_free_rx_ring(struct nuport_mac_priv *priv)
681{
682    int i;
683
684    for (i = 0; i < RX_RING_SIZE; i++) {
685        if (!priv->rx_skb[i])
686            continue;
687
688        dev_kfree_skb(priv->rx_skb[i]);
689        priv->rx_skb[i] = NULL;
690    }
691
692    if (priv->rx_addr)
693        dma_unmap_single(&priv->pdev->dev, priv->rx_addr, RX_ALLOC_SIZE,
694                DMA_TO_DEVICE);
695}
696
697static void nuport_mac_read_mac_address(struct net_device *dev)
698{
699    struct nuport_mac_priv *priv = netdev_priv(dev);
700    int i;
701
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);
706
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);
710    }
711}
712
713static int nuport_mac_change_mac_address(struct net_device *dev, void *mac_addr)
714{
715    struct sockaddr *addr = mac_addr;
716    struct nuport_mac_priv *priv = netdev_priv(dev);
717    unsigned long *temp = (unsigned long *)dev->dev_addr;
718    u32 high, low;
719
720    if (netif_running(dev))
721        return -EBUSY;
722
723    memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
724
725    spin_lock_irq(&priv->lock);
726
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);
730
731    low = nuport_mac_readl(MAC_ADDR_LOW_REG);
732    high = nuport_mac_readl(MAC_ADDR_HIGH_REG);
733
734    spin_unlock_irq(&priv->lock);
735
736    return 0;
737}
738
739static int nuport_mac_open(struct net_device *dev)
740{
741    int ret;
742    struct nuport_mac_priv *priv = netdev_priv(dev);
743    unsigned long flags;
744    u32 reg = 0;
745
746    ret = clk_enable(priv->emac_clk);
747    if (ret) {
748        netdev_err(dev, "failed to enable EMAC clock\n");
749        return ret;
750    }
751
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);
757
758    /* set mac address in hardware in case it was not already */
759    nuport_mac_change_mac_address(dev, dev->dev_addr);
760
761    ret = request_irq(priv->link_irq, &nuport_mac_link_interrupt,
762                0, dev->name, dev);
763    if (ret) {
764        netdev_err(dev, "unable to request link interrupt\n");
765        goto out_emac_clk;
766    }
767
768    ret = request_irq(priv->tx_irq, &nuport_mac_tx_interrupt,
769                0, dev->name, dev);
770    if (ret) {
771        netdev_err(dev, "unable to request rx interrupt\n");
772        goto out_link_irq;
773    }
774
775    /* Enable link interrupt monitoring for our PHY address */
776    reg = LINK_INT_EN | (priv->phydev->addr << LINK_PHY_ADDR_SHIFT);
777    /* MII_BMSR register to be watched */
778    reg |= (1 << LINK_PHY_REG_SHIFT);
779    /* BMSR_STATUS to be watched in particular */
780    reg |= (2 << LINK_BIT_UP_SHIFT);
781
782    spin_lock_irqsave(&priv->lock, flags);
783    nuport_mac_writel(reg, LINK_INT_CSR);
784    nuport_mac_writel(LINK_POLL_MASK, LINK_INT_POLL_TIME);
785    spin_unlock_irqrestore(&priv->lock, flags);
786
787    phy_start(priv->phydev);
788
789    ret = request_irq(priv->rx_irq, &nuport_mac_rx_interrupt,
790                0, dev->name, dev);
791    if (ret) {
792        netdev_err(dev, "unable to request tx interrupt\n");
793        goto out_tx_irq;
794    }
795
796    netif_start_queue(dev);
797
798    nuport_mac_init_tx_ring(priv);
799
800    ret = nuport_mac_init_rx_ring(dev);
801    if (ret) {
802        netdev_err(dev, "rx ring init failed\n");
803        goto out_rx_skb;
804    }
805
806    nuport_mac_reset_tx_dma(priv);
807    nuport_mac_reset_rx_dma(priv);
808
809    /* Start RX DMA */
810    spin_lock_irqsave(&priv->lock, flags);
811    ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
812    spin_unlock_irqrestore(&priv->lock, flags);
813
814    napi_enable(&priv->napi);
815
816    return ret;
817
818out_rx_skb:
819    nuport_mac_free_rx_ring(priv);
820    free_irq(priv->rx_irq, dev);
821out_tx_irq:
822    free_irq(priv->tx_irq, dev);
823out_link_irq:
824    free_irq(priv->link_irq, dev);
825out_emac_clk:
826    clk_disable(priv->emac_clk);
827    return ret;
828}
829
830static int nuport_mac_close(struct net_device *dev)
831{
832    u32 reg;
833    struct nuport_mac_priv *priv = netdev_priv(dev);
834
835    spin_lock_irq(&priv->lock);
836    reg = nuport_mac_readl(CTRL_REG);
837    reg &= ~(RX_ENABLE | TX_ENABLE);
838    nuport_mac_writel(reg, CTRL_REG);
839
840    napi_disable(&priv->napi);
841    netif_stop_queue(dev);
842
843    free_irq(priv->link_irq, dev);
844    /* disable PHY polling */
845    nuport_mac_writel(0, LINK_INT_CSR);
846    nuport_mac_writel(0, LINK_INT_POLL_TIME);
847    phy_stop(priv->phydev);
848
849    free_irq(priv->tx_irq, dev);
850    free_irq(priv->rx_irq, dev);
851    spin_unlock_irq(&priv->lock);
852
853    nuport_mac_free_rx_ring(priv);
854
855    clk_disable(priv->emac_clk);
856
857    return 0;
858}
859
860static void nuport_mac_tx_timeout(struct net_device *dev)
861{
862    struct nuport_mac_priv *priv = netdev_priv(dev);
863    unsigned int i;
864
865    netdev_warn(dev, "transmit timeout, attempting recovery\n");
866
867    netdev_info(dev, "TX DMA regs\n");
868    for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
869        netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(TX_DMA_BASE + i));
870    netdev_info(dev, "RX DMA regs\n");
871    for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
872        netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(RX_DMA_BASE + i));
873
874    nuport_mac_init_tx_ring(priv);
875    nuport_mac_reset_tx_dma(priv);
876
877    netif_wake_queue(dev);
878}
879
880static int nuport_mac_mii_probe(struct net_device *dev)
881{
882    struct nuport_mac_priv *priv = netdev_priv(dev);
883    struct phy_device *phydev = NULL;
884    int ret;
885
886    ret = clk_enable(priv->ephy_clk);
887    if (ret) {
888        netdev_err(dev, "unable to enable ePHY clk\n");
889        return ret;
890    }
891
892    phydev = phy_find_first(priv->mii_bus);
893    if (!phydev) {
894        netdev_err(dev, "no PHYs found\n");
895        ret = -ENODEV;
896        goto out;
897    }
898
899    phydev = phy_connect(dev, dev_name(&phydev->dev),
900            nuport_mac_adjust_link, 0,
901            PHY_INTERFACE_MODE_MII);
902    if (IS_ERR(phydev)) {
903        netdev_err(dev, "could not attach PHY\n");
904        ret = PTR_ERR(phydev);
905        goto out;
906    }
907
908    phydev->supported &= PHY_BASIC_FEATURES;
909    phydev->advertising = phydev->supported;
910    priv->phydev = phydev;
911    priv->old_link = 1;
912    priv->old_duplex = DUPLEX_FULL;
913
914    dev_info(&priv->pdev->dev, "attached PHY driver [%s] "
915        "(mii_bus:phy_addr=%d)\n",
916        phydev->drv->name, phydev->addr);
917
918    return 0;
919
920out:
921    /* disable the Ethernet PHY clock for the moment */
922    clk_disable(priv->ephy_clk);
923
924    return ret;
925}
926
927static void nuport_mac_ethtool_drvinfo(struct net_device *dev,
928                    struct ethtool_drvinfo *info)
929{
930    strncpy(info->driver, "nuport-mac", sizeof(info->driver));
931    strncpy(info->version, "0.1", sizeof(info->version));
932    strncpy(info->fw_version, "N/A", sizeof(info->fw_version));
933    strncpy(info->bus_info, "internal", sizeof(info->bus_info));
934    info->n_stats = 0;
935    info->testinfo_len = 0;
936    info->regdump_len = 0;
937    info->eedump_len = 0;
938}
939
940static int nuport_mac_ethtool_get_settings(struct net_device *dev,
941                    struct ethtool_cmd *cmd)
942{
943    struct nuport_mac_priv *priv = netdev_priv(dev);
944
945    if (priv->phydev)
946        return phy_ethtool_gset(priv->phydev, cmd);
947
948    return -EINVAL;
949}
950
951static int nuport_mac_ethtool_set_settings(struct net_device *dev,
952                    struct ethtool_cmd *cmd)
953{
954    struct nuport_mac_priv *priv = netdev_priv(dev);
955
956    if (priv->phydev)
957        return phy_ethtool_sset(priv->phydev, cmd);
958
959    return -EINVAL;
960}
961
962static void nuport_mac_set_msglevel(struct net_device *dev, u32 msg_level)
963{
964    struct nuport_mac_priv *priv = netdev_priv(dev);
965
966    priv->msg_level = msg_level;
967}
968
969static u32 nuport_mac_get_msglevel(struct net_device *dev)
970{
971    struct nuport_mac_priv *priv = netdev_priv(dev);
972
973    return priv->msg_level;
974}
975
976static const struct ethtool_ops nuport_mac_ethtool_ops = {
977    .get_drvinfo = nuport_mac_ethtool_drvinfo,
978    .get_link = ethtool_op_get_link,
979    .get_settings = nuport_mac_ethtool_get_settings,
980    .set_settings = nuport_mac_ethtool_set_settings,
981    .set_msglevel = nuport_mac_set_msglevel,
982    .get_msglevel = nuport_mac_get_msglevel,
983};
984
985static const struct net_device_ops nuport_mac_ops = {
986    .ndo_open = nuport_mac_open,
987    .ndo_stop = nuport_mac_close,
988    .ndo_start_xmit = nuport_mac_start_xmit,
989    .ndo_change_mtu = eth_change_mtu,
990    .ndo_validate_addr = eth_validate_addr,
991    .ndo_set_mac_address = nuport_mac_change_mac_address,
992    .ndo_tx_timeout = nuport_mac_tx_timeout,
993};
994
995static int __init nuport_mac_probe(struct platform_device *pdev)
996{
997    struct net_device *dev;
998    struct nuport_mac_priv *priv = NULL;
999    struct resource *regs, *dma;
1000    int ret = 0;
1001    int rx_irq, tx_irq, link_irq;
1002    int i;
1003    const unsigned int *intspec;
1004
1005    dev = alloc_etherdev(sizeof(struct nuport_mac_priv));
1006    if (!dev) {
1007        dev_err(&pdev->dev, "no memory for net_device\n");
1008        return -ENOMEM;
1009    }
1010
1011    regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1012    dma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1013    if (!regs || !dma) {
1014        dev_err(&pdev->dev, "failed to get regs resources\n");
1015        ret = -ENODEV;
1016        goto out;
1017    }
1018
1019    rx_irq = platform_get_irq(pdev, 0);
1020    tx_irq = platform_get_irq(pdev, 1);
1021    link_irq = platform_get_irq(pdev, 2);
1022    if (rx_irq < 0 || tx_irq < 0 || link_irq < 0) {
1023        ret = -ENODEV;
1024        goto out;
1025    }
1026
1027    platform_set_drvdata(pdev, dev);
1028    SET_NETDEV_DEV(dev, &pdev->dev);
1029    priv = netdev_priv(dev);
1030    priv->pdev = pdev;
1031    priv->dev = dev;
1032    spin_lock_init(&priv->lock);
1033
1034    intspec = of_get_property(pdev->dev.of_node,
1035                "nuport-mac,buffer-shifting", NULL);
1036    if (!intspec)
1037        priv->buffer_shifting_len = 0;
1038    else
1039        priv->buffer_shifting_len = 2;
1040
1041    priv->mac_base = devm_ioremap(&pdev->dev,
1042                regs->start, resource_size(regs));
1043    if (!priv->mac_base) {
1044        dev_err(&pdev->dev, "failed to remap regs\n");
1045        ret = -ENOMEM;
1046        goto out_platform;
1047    }
1048
1049    priv->dma_base = devm_ioremap(&pdev->dev,
1050                dma->start, resource_size(dma));
1051    if (!priv->dma_base) {
1052        dev_err(&pdev->dev, "failed to remap dma-regs\n");
1053        ret = -ENOMEM;
1054        goto out_platform;
1055    }
1056
1057    priv->emac_clk = clk_get(&pdev->dev, "emac");
1058    if (IS_ERR_OR_NULL(priv->emac_clk)) {
1059        dev_err(&pdev->dev, "failed to get emac clk\n");
1060        ret = PTR_ERR(priv->emac_clk);
1061        goto out_platform;
1062    }
1063
1064    priv->ephy_clk = clk_get(&pdev->dev, "ephy");
1065    if (IS_ERR_OR_NULL(priv->ephy_clk)) {
1066        dev_err(&pdev->dev, "failed to get ephy clk\n");
1067        ret = PTR_ERR(priv->ephy_clk);
1068        goto out_platform;
1069    }
1070
1071    priv->link_irq = link_irq;
1072    priv->rx_irq = rx_irq;
1073    priv->tx_irq = tx_irq;
1074    priv->msg_level = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK;
1075    dev->netdev_ops = &nuport_mac_ops;
1076    dev->ethtool_ops = &nuport_mac_ethtool_ops;
1077    dev->watchdog_timeo = HZ;
1078    dev->flags = IFF_BROADCAST; /* Supports Broadcast */
1079    dev->tx_queue_len = TX_RING_SIZE / 2;
1080
1081    netif_napi_add(dev, &priv->napi, nuport_mac_poll, 64);
1082
1083    priv->mii_bus = mdiobus_alloc();
1084    if (!priv->mii_bus) {
1085        dev_err(&pdev->dev, "mii bus allocation failed\n");
1086        goto out;
1087    }
1088
1089    priv->mii_bus->priv = dev;
1090    priv->mii_bus->read = nuport_mac_mii_read;
1091    priv->mii_bus->write = nuport_mac_mii_write;
1092    priv->mii_bus->reset = nuport_mac_mii_reset;
1093    priv->mii_bus->name = "nuport-mac-mii";
1094    priv->mii_bus->phy_mask = (1 << 0);
1095    snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
1096    priv->mii_bus->irq = kzalloc(PHY_MAX_ADDR * sizeof(int), GFP_KERNEL);
1097    if (!priv->mii_bus->irq) {
1098        dev_err(&pdev->dev, "failed to allocate mii_bus irqs\n");
1099        ret = -ENOMEM;
1100        goto out_mdio;
1101    }
1102
1103    /* We support PHY interrupts routed back to the MAC */
1104    for (i = 0; i < PHY_MAX_ADDR; i++)
1105        priv->mii_bus->irq[i] = PHY_IGNORE_INTERRUPT;
1106
1107    ret = mdiobus_register(priv->mii_bus);
1108    if (ret) {
1109        dev_err(&pdev->dev, "failed to register mii_bus\n");
1110        goto out_mdio_irq;
1111    }
1112
1113    ret = nuport_mac_mii_probe(dev);
1114    if (ret) {
1115        dev_err(&pdev->dev, "failed to probe MII bus\n");
1116        goto out_mdio_unregister;
1117    }
1118
1119    ret = register_netdev(dev);
1120    if (ret) {
1121        dev_err(&pdev->dev, "failed to register net_device\n");
1122        goto out_mdio_probe;
1123    }
1124
1125    /* read existing mac address */
1126    nuport_mac_read_mac_address(dev);
1127
1128    dev_info(&pdev->dev, "registered (MAC: %pM)\n", dev->dev_addr);
1129
1130    return ret;
1131
1132out_mdio_probe:
1133    phy_disconnect(priv->phydev);
1134out_mdio_unregister:
1135    mdiobus_unregister(priv->mii_bus);
1136out_mdio_irq:
1137    kfree(priv->mii_bus->irq);
1138out_mdio:
1139    mdiobus_free(priv->mii_bus);
1140out_platform:
1141    platform_set_drvdata(pdev, NULL);
1142out:
1143    clk_put(priv->ephy_clk);
1144    clk_put(priv->emac_clk);
1145    free_netdev(dev);
1146    platform_set_drvdata(pdev, NULL);
1147    return ret;
1148}
1149
1150static int nuport_mac_remove(struct platform_device *pdev)
1151{
1152    struct net_device *dev = platform_get_drvdata(pdev);
1153    struct nuport_mac_priv *priv = netdev_priv(dev);
1154
1155    unregister_netdev(dev);
1156    phy_disconnect(priv->phydev);
1157    mdiobus_unregister(priv->mii_bus);
1158    kfree(priv->mii_bus->irq);
1159    mdiobus_free(priv->mii_bus);
1160    clk_put(priv->ephy_clk);
1161    clk_put(priv->emac_clk);
1162    free_netdev(dev);
1163
1164    platform_set_drvdata(pdev, NULL);
1165
1166    return 0;
1167}
1168
1169static struct of_device_id nuport_eth_ids[] __initdata = {
1170    {.compatible = "moschip,nuport-mac",},
1171    { /* sentinel */ },
1172};
1173
1174static struct platform_driver nuport_eth_driver = {
1175    .driver = {
1176        .name = "nuport-mac",
1177        .owner = THIS_MODULE,
1178        .of_match_table = nuport_eth_ids,
1179    },
1180    .probe = nuport_mac_probe,
1181    .remove = __devexit_p(nuport_mac_remove),
1182};
1183
1184module_platform_driver(nuport_eth_driver);
1185
1186MODULE_AUTHOR("Moschip Semiconductors Ltd.");
1187MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver");
1188MODULE_LICENSE("GPL");
1189

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