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nuport-mac: add definitions of the various bits/masks used
[openwrt/staging/lynxis/omap.git] / 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
113 static inline u32 nuport_mac_readl(void __iomem *reg)
114 {
115 return __raw_readl(reg);
116 }
117
118 static inline u8 nuport_mac_readb(void __iomem *reg)
119 {
120 return __raw_readb(reg);
121 }
122
123 static inline void nuport_mac_writel(u32 value, void __iomem *reg)
124 {
125 __raw_writel(value, reg);
126 }
127
128 static inline void nuport_mac_writeb(u8 value, void __iomem *reg)
129 {
130 __raw_writel(value, reg);
131 }
132
133 /* MAC private data */
134 struct 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 unsigned int valid_txskb[TX_RING_SIZE];
149 unsigned int cur_tx;
150 unsigned int dma_tx;
151 unsigned int tx_full;
152
153 /* Receive buffers */
154 struct sk_buff *rx_skb[RX_RING_SIZE];
155 unsigned int irq_rxskb[RX_RING_SIZE];
156 int pkt_len[RX_RING_SIZE];
157 unsigned int cur_rx;
158 unsigned int dma_rx;
159 unsigned int rx_full;
160
161 unsigned int first_pkt;
162
163 /* Private data */
164 struct napi_struct napi;
165 struct net_device *dev;
166 struct platform_device *pdev;
167 struct mii_bus *mii_bus;
168 struct phy_device *phydev;
169 int old_link;
170 int old_duplex;
171 u32 msg_level;
172 unsigned int buffer_shifting_len;
173 };
174
175 static inline int nuport_mac_mii_busy_wait(struct nuport_mac_priv *priv)
176 {
177 unsigned long curr;
178 unsigned long finish = jiffies + 3 * HZ;
179
180 do {
181 curr = jiffies;
182 if (!(nuport_mac_readl(MII_ADDR_REG) & MII_BUSY))
183 return 0;
184 cpu_relax();
185 } while (!time_after_eq(curr, finish));
186
187 return -EBUSY;
188 }
189
190 /* Read from PHY registers */
191 static int nuport_mac_mii_read(struct mii_bus *bus,
192 int mii_id, int regnum)
193 {
194 struct net_device *dev = bus->priv;
195 struct nuport_mac_priv *priv = netdev_priv(dev);
196 int ret;
197 u32 val = 0;
198
199 ret = nuport_mac_mii_busy_wait(priv);
200 if (ret)
201 return ret;
202
203 val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT) | MII_BUSY;
204 nuport_mac_writel(val, MII_ADDR_REG);
205 ret = nuport_mac_mii_busy_wait(priv);
206 if (ret)
207 return ret;
208
209 return nuport_mac_readl(MII_DATA_REG);
210 }
211
212 static int nuport_mac_mii_write(struct mii_bus *bus, int mii_id,
213 int regnum, u16 value)
214 {
215 struct net_device *dev = bus->priv;
216 struct nuport_mac_priv *priv = netdev_priv(dev);
217 int ret;
218 u32 val = 0;
219
220 ret = nuport_mac_mii_busy_wait(priv);
221 if (ret)
222 return ret;
223
224 val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT);
225 val |= MII_BUSY | MII_WRITE;
226 nuport_mac_writel(value, MII_DATA_REG);
227 nuport_mac_writel(val, MII_ADDR_REG);
228
229 return nuport_mac_mii_busy_wait(priv);
230 }
231
232 static int nuport_mac_mii_reset(struct mii_bus *bus)
233 {
234 return 0;
235 }
236
237 static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
238 struct sk_buff *skb)
239 {
240 dma_addr_t p;
241 u32 reg;
242 unsigned int timeout = 2048;
243
244 while (timeout--) {
245 reg = nuport_mac_readl(TX_START_DMA);
246 if (!(reg & TX_DMA_ENABLE)) {
247 netdev_dbg(priv->dev, "dma ready\n");
248 break;
249 }
250 cpu_relax();
251 }
252
253 if (!timeout)
254 return -EBUSY;
255
256 p = dma_map_single(&priv->pdev->dev, skb->data,
257 skb->len, DMA_TO_DEVICE);
258
259 /* enable enhanced mode */
260 nuport_mac_writel(TX_DMA_ENH_ENABLE, TX_DMA_ENH);
261 nuport_mac_writel(p, TX_BUFFER_ADDR);
262 nuport_mac_writel((skb->len) - 1, TX_PKT_BYTES);
263 wmb();
264 reg = TX_DMA_ENABLE | TX_DMA_START_FRAME | TX_DMA_END_FRAME;
265 nuport_mac_writel(reg, TX_START_DMA);
266
267 return 0;
268 }
269
270 static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv)
271 {
272 u32 reg;
273
274 reg = nuport_mac_readl(TX_START_DMA);
275 reg |= TX_DMA_RESET;
276 nuport_mac_writel(reg, TX_START_DMA);
277 }
278
279 static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
280 struct sk_buff *skb)
281 {
282 dma_addr_t p;
283 u32 reg;
284 unsigned int timeout = 2048;
285
286 while (timeout--) {
287 reg = nuport_mac_readl(RX_START_DMA);
288 if (!(reg & RX_DMA_ENABLE)) {
289 netdev_dbg(priv->dev, "dma ready\n");
290 break;
291 }
292 cpu_relax();
293 }
294
295 if (!timeout)
296 return -EBUSY;
297
298 p = dma_map_single(&priv->pdev->dev, skb->data,
299 RX_ALLOC_SIZE, DMA_FROM_DEVICE);
300
301 nuport_mac_writel(p, RX_BUFFER_ADDR);
302 wmb();
303 nuport_mac_writel(RX_DMA_ENABLE, RX_START_DMA);
304
305 return 0;
306 }
307
308 static void nuport_mac_reset_rx_dma(struct nuport_mac_priv *priv)
309 {
310 u32 reg;
311
312 reg = nuport_mac_readl(RX_START_DMA);
313 reg |= RX_DMA_RESET;
314 nuport_mac_writel(reg, RX_START_DMA);
315 }
316
317 /* I suppose this might do something, but I am not sure actually */
318 static void nuport_mac_disable_rx_dma(struct nuport_mac_priv *priv)
319 {
320 u32 reg;
321
322 reg = nuport_mac_readl(RX_DMA_ENH);
323 reg &= ~RX_DMA_INT_ENABLE;
324 nuport_mac_writel(reg, RX_DMA_ENH);
325 }
326
327 static void nuport_mac_enable_rx_dma(struct nuport_mac_priv *priv)
328 {
329 u32 reg;
330
331 reg = nuport_mac_readl(RX_DMA_ENH);
332 reg |= RX_DMA_INT_ENABLE;
333 nuport_mac_writel(reg, RX_DMA_ENH);
334 }
335
336 /* Add packets to the transmit queue */
337 static int nuport_mac_start_xmit(struct sk_buff *skb, struct net_device *dev)
338 {
339 unsigned long flags;
340 struct nuport_mac_priv *priv = netdev_priv(dev);
341 int ret;
342
343 if (netif_queue_stopped(dev)) {
344 netdev_warn(dev, "netif queue was stopped, restarting\n");
345 netif_start_queue(dev);
346 }
347
348 spin_lock_irqsave(&priv->lock, flags);
349 if (priv->first_pkt) {
350 ret = nuport_mac_start_tx_dma(priv, skb);
351 if (ret) {
352 netif_stop_queue(dev);
353 spin_unlock_irqrestore(&priv->lock, flags);
354 netdev_err(dev, "transmit path busy\n");
355 return NETDEV_TX_BUSY;
356 }
357 priv->first_pkt = 0;
358 }
359
360 priv->tx_skb[priv->cur_tx] = skb;
361 dev->stats.tx_bytes += skb->len;
362 dev->stats.tx_packets++;
363 priv->valid_txskb[priv->cur_tx] = 1;
364 priv->cur_tx++;
365 dev->trans_start = jiffies;
366
367 if (priv->cur_tx >= TX_RING_SIZE)
368 priv->cur_tx = 0;
369
370 spin_unlock_irqrestore(&priv->lock, flags);
371
372 if (priv->valid_txskb[priv->cur_tx]) {
373 priv->tx_full = 1;
374 netdev_err(dev, "stopping queue\n");
375 netif_stop_queue(dev);
376 }
377
378 return NETDEV_TX_OK;
379 }
380
381 static void nuport_mac_adjust_link(struct net_device *dev)
382 {
383 struct nuport_mac_priv *priv = netdev_priv(dev);
384 struct phy_device *phydev = priv->phydev;
385 unsigned int status_changed = 0;
386 u32 reg;
387
388 BUG_ON(!phydev);
389
390 if (priv->old_link != phydev->link) {
391 status_changed = 1;
392 priv->old_link = phydev->link;
393 }
394
395 if (phydev->link & (priv->old_duplex != phydev->duplex)) {
396 reg = nuport_mac_readl(CTRL_REG);
397 if (phydev->duplex == DUPLEX_FULL)
398 reg |= DUPLEX_FULL;
399 else
400 reg &= ~DUPLEX_FULL;
401 nuport_mac_writel(reg, CTRL_REG);
402
403 status_changed = 1;
404 priv->old_duplex = phydev->duplex;
405 }
406
407 if (!status_changed)
408 return;
409
410 pr_info("%s: link %s", dev->name, phydev->link ?
411 "UP" : "DOWN");
412 if (phydev->link) {
413 pr_cont(" - %d/%s", phydev->speed,
414 phydev->duplex == DUPLEX_FULL ? "full" : "half");
415 }
416 pr_cont("\n");
417 }
418
419 static irqreturn_t nuport_mac_link_interrupt(int irq, void *dev_id)
420 {
421 struct net_device *dev = dev_id;
422 struct nuport_mac_priv *priv = netdev_priv(dev);
423 u32 reg;
424 u8 phy_addr;
425
426 reg = nuport_mac_readl(LINK_INT_CSR);
427 phy_addr = (reg >> LINK_PHY_ADDR_SHIFT) & (PHY_MAX_ADDR - 1);
428
429 if (phy_addr != priv->phydev->addr) {
430 netdev_err(dev, "spurious PHY irq (phy: %d)\n", phy_addr);
431 return IRQ_NONE;
432 }
433
434 priv->phydev->link = (reg & LINK_UP);
435 nuport_mac_adjust_link(dev);
436
437 return IRQ_HANDLED;
438 }
439
440 static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
441 {
442 struct net_device *dev = (struct net_device *)dev_id;
443 struct nuport_mac_priv *priv = netdev_priv(dev);
444 struct sk_buff *skb;
445 unsigned long flags;
446 int ret;
447 u32 reg;
448
449 spin_lock_irqsave(&priv->lock, flags);
450 /* clear status word available if ready */
451 reg = nuport_mac_readl(TX_START_DMA);
452 if (reg & TX_DMA_STATUS_AVAIL) {
453 nuport_mac_writel(reg, TX_START_DMA);
454 reg = nuport_mac_readl(TX_DMA_STATUS);
455
456 if (reg & 1)
457 dev->stats.tx_errors++;
458 } else
459 netdev_dbg(dev, "no status word: %08x\n", reg);
460
461 skb = priv->tx_skb[priv->dma_tx];
462 priv->tx_skb[priv->dma_tx] = NULL;
463 priv->valid_txskb[priv->dma_tx] = 0;
464 dev_kfree_skb_irq(skb);
465
466 priv->dma_tx++;
467 if (priv->dma_tx >= TX_RING_SIZE)
468 priv->dma_tx = 0;
469
470 if (!priv->valid_txskb[priv->dma_tx])
471 priv->first_pkt = 1;
472 else {
473 ret = nuport_mac_start_tx_dma(priv, priv->tx_skb[priv->dma_tx]);
474 if (ret)
475 netdev_err(dev, "failed to restart TX dma\n");
476 }
477
478 if (priv->tx_full) {
479 netdev_dbg(dev, "restarting transmit queue\n");
480 netif_wake_queue(dev);
481 priv->tx_full = 0;
482 }
483
484 spin_unlock_irqrestore(&priv->lock, flags);
485
486 return IRQ_HANDLED;
487 }
488
489 static unsigned int nuport_mac_has_work(struct nuport_mac_priv *priv)
490 {
491 unsigned int i;
492
493 for (i = 0; i < RX_RING_SIZE; i++)
494 if (priv->rx_skb[i])
495 return 1;
496
497 return 0;
498 }
499
500 static irqreturn_t nuport_mac_rx_interrupt(int irq, void *dev_id)
501 {
502 struct net_device *dev = (struct net_device *)dev_id;
503 struct nuport_mac_priv *priv = netdev_priv(dev);
504 unsigned long flags;
505 int ret;
506
507 spin_lock_irqsave(&priv->lock, flags);
508 if (!priv->rx_full) {
509 priv->pkt_len[priv->dma_rx] = nuport_mac_readl(RX_ACT_BYTES) - 4;
510 priv->irq_rxskb[priv->dma_rx] = 0;
511 priv->dma_rx++;
512
513 if (priv->dma_rx >= RX_RING_SIZE)
514 priv->dma_rx = 0;
515 } else
516 priv->rx_full = 0;
517
518 if (priv->irq_rxskb[priv->dma_rx] == 1) {
519 ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[priv->dma_rx]);
520 if (ret)
521 netdev_err(dev, "failed to start rx dma\n");
522 } else {
523 priv->rx_full = 1;
524 netdev_dbg(dev, "RX ring full\n");
525 }
526
527 if (likely(nuport_mac_has_work(priv))) {
528 /* find a way to disable DMA rx irq */
529 nuport_mac_disable_rx_dma(priv);
530 napi_schedule(&priv->napi);
531 }
532 spin_unlock_irqrestore(&priv->lock, flags);
533
534 return IRQ_HANDLED;
535 }
536
537 /* Process received packets in tasklet */
538 static int nuport_mac_rx(struct net_device *dev, int limit)
539 {
540 struct nuport_mac_priv *priv = netdev_priv(dev);
541 struct sk_buff *skb;
542 int len, status;
543 int count = 0;
544
545 while (count < limit && !priv->irq_rxskb[priv->cur_rx]) {
546 skb = priv->rx_skb[priv->cur_rx];
547 len = priv->pkt_len[priv->cur_rx];
548
549 /* Remove 2 bytes added by RX buffer shifting */
550 len = len - priv->buffer_shifting_len;
551 skb->data = skb->data + priv->buffer_shifting_len;
552
553 /* Get packet status */
554 status = get_unaligned((u32 *) (skb->data + len));
555 skb->dev = dev;
556
557 /* packet filter failed */
558 if (!(status & (1 << 30))) {
559 dev_kfree_skb_irq(skb);
560 goto exit;
561 }
562
563 /* missed frame */
564 if (status & (1 << 31)) {
565 dev->stats.rx_missed_errors++;
566 dev_kfree_skb_irq(skb);
567 goto exit;
568 }
569
570 /* Not ethernet type */
571 if ((!(status & (1 << 18))) || (status & ERROR_FILTER_MASK))
572 dev->stats.rx_errors++;
573
574 if (len > MAX_ETH_FRAME_SIZE) {
575 dev_kfree_skb_irq(skb);
576 goto exit;
577 } else
578 skb_put(skb, len);
579
580 skb->protocol = eth_type_trans(skb, dev);
581 dev->stats.rx_packets++;
582
583 if (status & (1 << 29))
584 skb->pkt_type = PACKET_OTHERHOST;
585 if (status & (1 << 27))
586 skb->pkt_type = PACKET_MULTICAST;
587 if (status & (1 << 28))
588 skb->pkt_type = PACKET_BROADCAST;
589
590 skb->ip_summed = CHECKSUM_UNNECESSARY;
591
592 /* Pass the received packet to network layer */
593 status = netif_receive_skb(skb);
594 if (status != NET_RX_DROP)
595 dev->stats.rx_bytes += len - 4; /* Without CRC */
596 else
597 dev->stats.rx_dropped++;
598
599 dev->last_rx = jiffies;
600
601 exit:
602 skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
603 skb_reserve(skb, RX_SKB_HEADROOM);
604 priv->rx_skb[priv->cur_rx] = skb;
605 priv->irq_rxskb[priv->cur_rx] = 1;
606 priv->cur_rx++;
607
608 if (priv->cur_rx >= RX_RING_SIZE)
609 priv->cur_rx = 0;
610 count++;
611 }
612
613 return count;
614 }
615
616 static int nuport_mac_poll(struct napi_struct *napi, int budget)
617 {
618 struct nuport_mac_priv *priv =
619 container_of(napi, struct nuport_mac_priv, napi);
620 struct net_device *dev = priv->dev;
621 int work_done;
622
623 work_done = nuport_mac_rx(dev, budget);
624
625 if (work_done < budget) {
626 napi_complete(napi);
627 nuport_mac_enable_rx_dma(priv);
628 }
629
630 return work_done;
631 }
632
633 static void nuport_mac_init_tx_ring(struct nuport_mac_priv *priv)
634 {
635 int i;
636
637 priv->cur_tx = priv->dma_tx = priv->tx_full = 0;
638 for (i = 0; i < TX_RING_SIZE; i++) {
639 priv->tx_skb[i] = NULL;
640 priv->valid_txskb[i] = 0;
641 }
642 priv->first_pkt = 1;
643 }
644
645 static int nuport_mac_init_rx_ring(struct net_device *dev)
646 {
647 struct nuport_mac_priv *priv = netdev_priv(dev);
648 struct sk_buff *skb;
649 int i;
650
651 priv->cur_rx = priv->dma_rx = priv->rx_full = 0;
652
653 for (i = 0; i < RX_RING_SIZE; i++) {
654 skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
655 if (!skb)
656 return -ENOMEM;
657 skb_reserve(skb, RX_SKB_HEADROOM);
658 priv->rx_skb[i] = skb;
659 priv->irq_rxskb[i] = 1;
660 }
661
662 return 0;
663 }
664
665 static void nuport_mac_free_rx_ring(struct nuport_mac_priv *priv)
666 {
667 int i;
668
669 for (i = 0; i < RX_RING_SIZE; i++) {
670 if (!priv->rx_skb[i])
671 continue;
672
673 dev_kfree_skb(priv->rx_skb[i]);
674 priv->rx_skb[i] = NULL;
675 }
676 }
677
678 static void nuport_mac_read_mac_address(struct net_device *dev)
679 {
680 struct nuport_mac_priv *priv = netdev_priv(dev);
681 int i;
682
683 for (i = 0; i < 4; i++)
684 dev->dev_addr[i] = nuport_mac_readb(MAC_ADDR_LOW_REG + i);
685 dev->dev_addr[4] = nuport_mac_readb(MAC_ADDR_HIGH_REG);
686 dev->dev_addr[5] = nuport_mac_readb(MAC_ADDR_HIGH_REG + 1);
687
688 if (!is_valid_ether_addr(dev->dev_addr)) {
689 dev_info(&priv->pdev->dev, "using random address\n");
690 random_ether_addr(dev->dev_addr);
691 }
692 }
693
694 static int nuport_mac_change_mac_address(struct net_device *dev, void *mac_addr)
695 {
696 struct sockaddr *addr = mac_addr;
697 struct nuport_mac_priv *priv = netdev_priv(dev);
698 unsigned long *temp = (unsigned long *)dev->dev_addr;
699 u32 high, low;
700
701 if (netif_running(dev))
702 return -EBUSY;
703
704 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
705
706 spin_lock_irq(&priv->lock);
707
708 nuport_mac_writel(*temp, MAC_ADDR_LOW_REG);
709 temp = (unsigned long *)(dev->dev_addr + 4);
710 nuport_mac_writel(*temp, MAC_ADDR_HIGH_REG);
711
712 low = nuport_mac_readl(MAC_ADDR_LOW_REG);
713 high = nuport_mac_readl(MAC_ADDR_HIGH_REG);
714
715 spin_unlock_irq(&priv->lock);
716
717 return 0;
718 }
719
720 static int nuport_mac_open(struct net_device *dev)
721 {
722 int ret;
723 struct nuport_mac_priv *priv = netdev_priv(dev);
724 unsigned long flags;
725 u32 reg = 0;
726
727 ret = clk_enable(priv->emac_clk);
728 if (ret) {
729 netdev_err(dev, "failed to enable EMAC clock\n");
730 return ret;
731 }
732
733 /* Set MAC into full duplex mode by default */
734 reg |= RX_ENABLE | TX_ENABLE;
735 reg |= DEFER_CHECK | STRIP_PAD | DRTRY_DISABLE;
736 reg |= FULL_DUPLEX | HBD_DISABLE;
737 nuport_mac_writel(reg, CTRL_REG);
738
739 /* set mac address in hardware in case it was not already */
740 nuport_mac_change_mac_address(dev, dev->dev_addr);
741
742 ret = request_irq(priv->link_irq, &nuport_mac_link_interrupt,
743 0, dev->name, dev);
744 if (ret) {
745 netdev_err(dev, "unable to request link interrupt\n");
746 goto out_emac_clk;
747 }
748
749 phy_start(priv->phydev);
750
751 /* Enable link interrupt monitoring for our PHY address */
752 reg = LINK_INT_EN | (priv->phydev->addr << LINK_PHY_ADDR_SHIFT);
753 /* MII_BMSR register to be watched */
754 reg |= (1 << LINK_PHY_REG_SHIFT);
755 /* BMSR_STATUS to be watched in particular */
756 reg |= (2 << LINK_BIT_UP_SHIFT);
757
758 spin_lock_irqsave(&priv->lock, flags);
759 nuport_mac_writel(reg, LINK_INT_CSR);
760 nuport_mac_writel(LINK_POLL_MASK, LINK_INT_POLL_TIME);
761 spin_unlock_irqrestore(&priv->lock, flags);
762
763 ret = request_irq(priv->tx_irq, &nuport_mac_tx_interrupt,
764 0, dev->name, dev);
765 if (ret) {
766 netdev_err(dev, "unable to request rx interrupt\n");
767 goto out_link_irq;
768 }
769
770 napi_enable(&priv->napi);
771
772 ret = request_irq(priv->rx_irq, &nuport_mac_rx_interrupt,
773 0, dev->name, dev);
774 if (ret) {
775 netdev_err(dev, "unable to request tx interrupt\n");
776 goto out_tx_irq;
777 }
778
779 netif_start_queue(dev);
780
781 nuport_mac_init_tx_ring(priv);
782
783 ret = nuport_mac_init_rx_ring(dev);
784 if (ret) {
785 netdev_err(dev, "rx ring init failed\n");
786 goto out_rx_skb;
787 }
788
789 nuport_mac_reset_tx_dma(priv);
790 nuport_mac_reset_rx_dma(priv);
791
792 /* Start RX DMA */
793 return nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
794
795 out_rx_skb:
796 nuport_mac_free_rx_ring(priv);
797 free_irq(priv->rx_irq, dev);
798 out_tx_irq:
799 free_irq(priv->tx_irq, dev);
800 out_link_irq:
801 free_irq(priv->link_irq, dev);
802 out_emac_clk:
803 clk_disable(priv->emac_clk);
804 return ret;
805 }
806
807 static int nuport_mac_close(struct net_device *dev)
808 {
809 struct nuport_mac_priv *priv = netdev_priv(dev);
810
811 spin_lock_irq(&priv->lock);
812 napi_disable(&priv->napi);
813 netif_stop_queue(dev);
814
815 free_irq(priv->link_irq, dev);
816 /* disable PHY polling */
817 nuport_mac_writel(0, LINK_INT_CSR);
818 nuport_mac_writel(0, LINK_INT_POLL_TIME);
819 phy_stop(priv->phydev);
820
821 free_irq(priv->tx_irq, dev);
822 free_irq(priv->rx_irq, dev);
823 spin_unlock_irq(&priv->lock);
824
825 nuport_mac_free_rx_ring(priv);
826
827 clk_disable(priv->emac_clk);
828
829 return 0;
830 }
831
832 static void nuport_mac_tx_timeout(struct net_device *dev)
833 {
834 struct nuport_mac_priv *priv = netdev_priv(dev);
835 unsigned int i;
836
837 netdev_warn(dev, "transmit timeout, attempting recovery\n");
838
839 netdev_info(dev, "TX DMA regs\n");
840 for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
841 netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(TX_DMA_BASE + i));
842 netdev_info(dev, "RX DMA regs\n");
843 for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
844 netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(RX_DMA_BASE + i));
845
846 nuport_mac_init_tx_ring(priv);
847 nuport_mac_reset_tx_dma(priv);
848
849 netif_wake_queue(dev);
850 }
851
852 static int nuport_mac_mii_probe(struct net_device *dev)
853 {
854 struct nuport_mac_priv *priv = netdev_priv(dev);
855 struct phy_device *phydev = NULL;
856 int ret;
857
858 ret = clk_enable(priv->ephy_clk);
859 if (ret) {
860 netdev_err(dev, "unable to enable ePHY clk\n");
861 return ret;
862 }
863
864 phydev = phy_find_first(priv->mii_bus);
865 if (!phydev) {
866 netdev_err(dev, "no PHYs found\n");
867 ret = -ENODEV;
868 goto out;
869 }
870
871 phydev = phy_connect(dev, dev_name(&phydev->dev),
872 nuport_mac_adjust_link, 0,
873 PHY_INTERFACE_MODE_MII);
874 if (IS_ERR(phydev)) {
875 netdev_err(dev, "could not attach PHY\n");
876 ret = PTR_ERR(phydev);
877 goto out;
878 }
879
880 phydev->supported &= PHY_BASIC_FEATURES;
881 phydev->advertising = phydev->supported;
882 priv->phydev = phydev;
883 priv->old_link = 0;
884 priv->old_duplex = -1;
885
886 dev_info(&priv->pdev->dev, "attached PHY driver [%s] "
887 "(mii_bus:phy_addr=%d)\n",
888 phydev->drv->name, phydev->addr);
889
890 return 0;
891
892 out:
893 /* disable the Ethernet PHY clock for the moment */
894 clk_disable(priv->ephy_clk);
895
896 return ret;
897 }
898
899 static void nuport_mac_ethtool_drvinfo(struct net_device *dev,
900 struct ethtool_drvinfo *info)
901 {
902 strncpy(info->driver, "nuport-mac", sizeof(info->driver));
903 strncpy(info->version, "0.1", sizeof(info->version));
904 strncpy(info->fw_version, "N/A", sizeof(info->fw_version));
905 strncpy(info->bus_info, "internal", sizeof(info->bus_info));
906 info->n_stats = 0;
907 info->testinfo_len = 0;
908 info->regdump_len = 0;
909 info->eedump_len = 0;
910 }
911
912 static int nuport_mac_ethtool_get_settings(struct net_device *dev,
913 struct ethtool_cmd *cmd)
914 {
915 struct nuport_mac_priv *priv = netdev_priv(dev);
916
917 if (priv->phydev)
918 return phy_ethtool_gset(priv->phydev, cmd);
919
920 return -EINVAL;
921 }
922
923 static int nuport_mac_ethtool_set_settings(struct net_device *dev,
924 struct ethtool_cmd *cmd)
925 {
926 struct nuport_mac_priv *priv = netdev_priv(dev);
927
928 if (priv->phydev)
929 return phy_ethtool_sset(priv->phydev, cmd);
930
931 return -EINVAL;
932 }
933
934 static void nuport_mac_set_msglevel(struct net_device *dev, u32 msg_level)
935 {
936 struct nuport_mac_priv *priv = netdev_priv(dev);
937
938 priv->msg_level = msg_level;
939 }
940
941 static u32 nuport_mac_get_msglevel(struct net_device *dev)
942 {
943 struct nuport_mac_priv *priv = netdev_priv(dev);
944
945 return priv->msg_level;
946 }
947
948 static const struct ethtool_ops nuport_mac_ethtool_ops = {
949 .get_drvinfo = nuport_mac_ethtool_drvinfo,
950 .get_link = ethtool_op_get_link,
951 .get_settings = nuport_mac_ethtool_get_settings,
952 .set_settings = nuport_mac_ethtool_set_settings,
953 .set_msglevel = nuport_mac_set_msglevel,
954 .get_msglevel = nuport_mac_get_msglevel,
955 };
956
957 static const struct net_device_ops nuport_mac_ops = {
958 .ndo_open = nuport_mac_open,
959 .ndo_stop = nuport_mac_close,
960 .ndo_start_xmit = nuport_mac_start_xmit,
961 .ndo_change_mtu = eth_change_mtu,
962 .ndo_validate_addr = eth_validate_addr,
963 .ndo_set_mac_address = nuport_mac_change_mac_address,
964 .ndo_tx_timeout = nuport_mac_tx_timeout,
965 };
966
967 static int __init nuport_mac_probe(struct platform_device *pdev)
968 {
969 struct net_device *dev;
970 struct nuport_mac_priv *priv = NULL;
971 struct resource *regs, *dma;
972 int ret = 0;
973 int rx_irq, tx_irq, link_irq;
974 int i;
975 const unsigned int *intspec;
976
977 dev = alloc_etherdev(sizeof(struct nuport_mac_priv));
978 if (!dev) {
979 dev_err(&pdev->dev, "no memory for net_device\n");
980 return -ENOMEM;
981 }
982
983 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
984 dma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
985 if (!regs || !dma) {
986 dev_err(&pdev->dev, "failed to get regs resources\n");
987 ret = -ENODEV;
988 goto out;
989 }
990
991 rx_irq = platform_get_irq(pdev, 0);
992 tx_irq = platform_get_irq(pdev, 1);
993 link_irq = platform_get_irq(pdev, 2);
994 if (rx_irq < 0 || tx_irq < 0 || link_irq < 0) {
995 ret = -ENODEV;
996 goto out;
997 }
998
999 platform_set_drvdata(pdev, dev);
1000 SET_NETDEV_DEV(dev, &pdev->dev);
1001 priv = netdev_priv(dev);
1002 priv->pdev = pdev;
1003 priv->dev = dev;
1004 spin_lock_init(&priv->lock);
1005
1006 intspec = of_get_property(pdev->dev.of_node,
1007 "nuport-mac,buffer-shifting", NULL);
1008 if (!intspec)
1009 priv->buffer_shifting_len = 0;
1010 else
1011 priv->buffer_shifting_len = 2;
1012
1013 priv->mac_base = devm_ioremap(&pdev->dev,
1014 regs->start, resource_size(regs));
1015 if (!priv->mac_base) {
1016 dev_err(&pdev->dev, "failed to remap regs\n");
1017 ret = -ENOMEM;
1018 goto out_platform;
1019 }
1020
1021 priv->dma_base = devm_ioremap(&pdev->dev,
1022 dma->start, resource_size(dma));
1023 if (!priv->dma_base) {
1024 dev_err(&pdev->dev, "failed to remap dma-regs\n");
1025 ret = -ENOMEM;
1026 goto out_platform;
1027 }
1028
1029 priv->emac_clk = clk_get(&pdev->dev, "emac");
1030 if (IS_ERR_OR_NULL(priv->emac_clk)) {
1031 dev_err(&pdev->dev, "failed to get emac clk\n");
1032 ret = PTR_ERR(priv->emac_clk);
1033 goto out_platform;
1034 }
1035
1036 priv->ephy_clk = clk_get(&pdev->dev, "ephy");
1037 if (IS_ERR_OR_NULL(priv->ephy_clk)) {
1038 dev_err(&pdev->dev, "failed to get ephy clk\n");
1039 ret = PTR_ERR(priv->ephy_clk);
1040 goto out_platform;
1041 }
1042
1043 priv->link_irq = link_irq;
1044 priv->rx_irq = rx_irq;
1045 priv->tx_irq = tx_irq;
1046 priv->msg_level = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK;
1047 dev->netdev_ops = &nuport_mac_ops;
1048 dev->ethtool_ops = &nuport_mac_ethtool_ops;
1049 dev->watchdog_timeo = HZ;
1050 dev->flags = IFF_BROADCAST; /* Supports Broadcast */
1051 dev->tx_queue_len = TX_RING_SIZE / 2;
1052
1053 netif_napi_add(dev, &priv->napi, nuport_mac_poll, 64);
1054
1055 priv->mii_bus = mdiobus_alloc();
1056 if (!priv->mii_bus) {
1057 dev_err(&pdev->dev, "mii bus allocation failed\n");
1058 goto out;
1059 }
1060
1061 priv->mii_bus->priv = dev;
1062 priv->mii_bus->read = nuport_mac_mii_read;
1063 priv->mii_bus->write = nuport_mac_mii_write;
1064 priv->mii_bus->reset = nuport_mac_mii_reset;
1065 priv->mii_bus->name = "nuport-mac-mii";
1066 priv->mii_bus->phy_mask = (1 << 0);
1067 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
1068 priv->mii_bus->irq = kzalloc(PHY_MAX_ADDR * sizeof(int), GFP_KERNEL);
1069 if (!priv->mii_bus->irq) {
1070 dev_err(&pdev->dev, "failed to allocate mii_bus irqs\n");
1071 ret = -ENOMEM;
1072 goto out_mdio;
1073 }
1074
1075 /* We support PHY interrupts routed back to the MAC */
1076 for (i = 0; i < PHY_MAX_ADDR; i++)
1077 priv->mii_bus->irq[i] = PHY_IGNORE_INTERRUPT;
1078
1079 ret = mdiobus_register(priv->mii_bus);
1080 if (ret) {
1081 dev_err(&pdev->dev, "failed to register mii_bus\n");
1082 goto out_mdio_irq;
1083 }
1084
1085 ret = nuport_mac_mii_probe(dev);
1086 if (ret) {
1087 dev_err(&pdev->dev, "failed to probe MII bus\n");
1088 goto out_mdio_unregister;
1089 }
1090
1091 ret = register_netdev(dev);
1092 if (ret) {
1093 dev_err(&pdev->dev, "failed to register net_device\n");
1094 goto out_mdio_probe;
1095 }
1096
1097 /* read existing mac address */
1098 nuport_mac_read_mac_address(dev);
1099
1100 dev_info(&pdev->dev, "registered (MAC: %pM)\n", dev->dev_addr);
1101
1102 return ret;
1103
1104 out_mdio_probe:
1105 phy_disconnect(priv->phydev);
1106 out_mdio_unregister:
1107 mdiobus_unregister(priv->mii_bus);
1108 out_mdio_irq:
1109 kfree(priv->mii_bus->irq);
1110 out_mdio:
1111 mdiobus_free(priv->mii_bus);
1112 out_platform:
1113 platform_set_drvdata(pdev, NULL);
1114 out:
1115 clk_put(priv->ephy_clk);
1116 clk_put(priv->emac_clk);
1117 free_netdev(dev);
1118 platform_set_drvdata(pdev, NULL);
1119 return ret;
1120 }
1121
1122 static int nuport_mac_remove(struct platform_device *pdev)
1123 {
1124 struct net_device *dev = platform_get_drvdata(pdev);
1125 struct nuport_mac_priv *priv = netdev_priv(dev);
1126
1127 unregister_netdev(dev);
1128 phy_disconnect(priv->phydev);
1129 mdiobus_unregister(priv->mii_bus);
1130 kfree(priv->mii_bus->irq);
1131 mdiobus_free(priv->mii_bus);
1132 clk_put(priv->ephy_clk);
1133 clk_put(priv->emac_clk);
1134 free_netdev(dev);
1135
1136 platform_set_drvdata(pdev, NULL);
1137
1138 return 0;
1139 }
1140
1141 static struct of_device_id nuport_eth_ids[] __initdata = {
1142 {.compatible = "moschip,nuport-mac",},
1143 { /* sentinel */ },
1144 };
1145
1146 static struct platform_driver nuport_eth_driver = {
1147 .driver = {
1148 .name = "nuport-mac",
1149 .owner = THIS_MODULE,
1150 .of_match_table = nuport_eth_ids,
1151 },
1152 .probe = nuport_mac_probe,
1153 .remove = __devexit_p(nuport_mac_remove),
1154 };
1155
1156 module_platform_driver(nuport_eth_driver);
1157
1158 MODULE_AUTHOR("Moschip Semiconductors Ltd.");
1159 MODULE_DESCRIPTION("Moschip MCS8140 Ethernet MAC driver");
1160 MODULE_LICENSE("GPL");
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