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pasemi_mac: Improve RX interrupt mitigation
[linux-2.6-omap-h63xx.git] / drivers / net / pasemi_mac.c
1 /*
2  * Copyright (C) 2006-2007 PA Semi, Inc
3  *
4  * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18  */
19
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/pci.h>
23 #include <linux/interrupt.h>
24 #include <linux/dmaengine.h>
25 #include <linux/delay.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <asm/dma-mapping.h>
29 #include <linux/in.h>
30 #include <linux/skbuff.h>
31
32 #include <linux/ip.h>
33 #include <linux/tcp.h>
34 #include <net/checksum.h>
35
36 #include <asm/irq.h>
37 #include <asm/firmware.h>
38 #include <asm/pasemi_dma.h>
39
40 #include "pasemi_mac.h"
41
42 /* We have our own align, since ppc64 in general has it at 0 because
43  * of design flaws in some of the server bridge chips. However, for
44  * PWRficient doing the unaligned copies is more expensive than doing
45  * unaligned DMA, so make sure the data is aligned instead.
46  */
47 #define LOCAL_SKB_ALIGN 2
48
49 /* TODO list
50  *
51  * - Multicast support
52  * - Large MTU support
53  * - SW LRO
54  * - Multiqueue RX/TX
55  */
56
57
58 /* Must be a power of two */
59 #define RX_RING_SIZE 1024
60 #define TX_RING_SIZE 4096
61
62 #define DEFAULT_MSG_ENABLE        \
63         (NETIF_MSG_DRV          | \
64          NETIF_MSG_PROBE        | \
65          NETIF_MSG_LINK         | \
66          NETIF_MSG_TIMER        | \
67          NETIF_MSG_IFDOWN       | \
68          NETIF_MSG_IFUP         | \
69          NETIF_MSG_RX_ERR       | \
70          NETIF_MSG_TX_ERR)
71
72 #define TX_DESC(tx, num)        ((tx)->chan.ring_virt[(num) & (TX_RING_SIZE-1)])
73 #define TX_DESC_INFO(tx, num)   ((tx)->ring_info[(num) & (TX_RING_SIZE-1)])
74 #define RX_DESC(rx, num)        ((rx)->chan.ring_virt[(num) & (RX_RING_SIZE-1)])
75 #define RX_DESC_INFO(rx, num)   ((rx)->ring_info[(num) & (RX_RING_SIZE-1)])
76 #define RX_BUFF(rx, num)        ((rx)->buffers[(num) & (RX_RING_SIZE-1)])
77
78 #define RING_USED(ring)         (((ring)->next_to_fill - (ring)->next_to_clean) \
79                                  & ((ring)->size - 1))
80 #define RING_AVAIL(ring)        ((ring->size) - RING_USED(ring))
81
82 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
83
84 MODULE_LICENSE("GPL");
85 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
86 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
87
88 static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
89 module_param(debug, int, 0);
90 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
91
92 static int translation_enabled(void)
93 {
94 #if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
95         return 1;
96 #else
97         return firmware_has_feature(FW_FEATURE_LPAR);
98 #endif
99 }
100
101 static void write_iob_reg(unsigned int reg, unsigned int val)
102 {
103         pasemi_write_iob_reg(reg, val);
104 }
105
106 static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
107 {
108         return pasemi_read_mac_reg(mac->dma_if, reg);
109 }
110
111 static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
112                           unsigned int val)
113 {
114         pasemi_write_mac_reg(mac->dma_if, reg, val);
115 }
116
117 static unsigned int read_dma_reg(unsigned int reg)
118 {
119         return pasemi_read_dma_reg(reg);
120 }
121
122 static void write_dma_reg(unsigned int reg, unsigned int val)
123 {
124         pasemi_write_dma_reg(reg, val);
125 }
126
127 static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
128 {
129         return mac->rx;
130 }
131
132 static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
133 {
134         return mac->tx;
135 }
136
137 static inline void prefetch_skb(const struct sk_buff *skb)
138 {
139         const void *d = skb;
140
141         prefetch(d);
142         prefetch(d+64);
143         prefetch(d+128);
144         prefetch(d+192);
145 }
146
147 static int mac_to_intf(struct pasemi_mac *mac)
148 {
149         struct pci_dev *pdev = mac->pdev;
150         u32 tmp;
151         int nintf, off, i, j;
152         int devfn = pdev->devfn;
153
154         tmp = read_dma_reg(PAS_DMA_CAP_IFI);
155         nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S;
156         off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S;
157
158         /* IOFF contains the offset to the registers containing the
159          * DMA interface-to-MAC-pci-id mappings, and NIN contains number
160          * of total interfaces. Each register contains 4 devfns.
161          * Just do a linear search until we find the devfn of the MAC
162          * we're trying to look up.
163          */
164
165         for (i = 0; i < (nintf+3)/4; i++) {
166                 tmp = read_dma_reg(off+4*i);
167                 for (j = 0; j < 4; j++) {
168                         if (((tmp >> (8*j)) & 0xff) == devfn)
169                                 return i*4 + j;
170                 }
171         }
172         return -1;
173 }
174
175 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
176 {
177         struct pci_dev *pdev = mac->pdev;
178         struct device_node *dn = pci_device_to_OF_node(pdev);
179         int len;
180         const u8 *maddr;
181         u8 addr[6];
182
183         if (!dn) {
184                 dev_dbg(&pdev->dev,
185                           "No device node for mac, not configuring\n");
186                 return -ENOENT;
187         }
188
189         maddr = of_get_property(dn, "local-mac-address", &len);
190
191         if (maddr && len == 6) {
192                 memcpy(mac->mac_addr, maddr, 6);
193                 return 0;
194         }
195
196         /* Some old versions of firmware mistakenly uses mac-address
197          * (and as a string) instead of a byte array in local-mac-address.
198          */
199
200         if (maddr == NULL)
201                 maddr = of_get_property(dn, "mac-address", NULL);
202
203         if (maddr == NULL) {
204                 dev_warn(&pdev->dev,
205                          "no mac address in device tree, not configuring\n");
206                 return -ENOENT;
207         }
208
209
210         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
211                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
212                 dev_warn(&pdev->dev,
213                          "can't parse mac address, not configuring\n");
214                 return -EINVAL;
215         }
216
217         memcpy(mac->mac_addr, addr, 6);
218
219         return 0;
220 }
221
222 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
223                                     struct sk_buff *skb,
224                                     const dma_addr_t *dmas)
225 {
226         int f;
227         int nfrags = skb_shinfo(skb)->nr_frags;
228         struct pci_dev *pdev = mac->dma_pdev;
229
230         pci_unmap_single(pdev, dmas[0], skb_headlen(skb), PCI_DMA_TODEVICE);
231
232         for (f = 0; f < nfrags; f++) {
233                 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
234
235                 pci_unmap_page(pdev, dmas[f+1], frag->size, PCI_DMA_TODEVICE);
236         }
237         dev_kfree_skb_irq(skb);
238
239         /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
240          * aligned up to a power of 2
241          */
242         return (nfrags + 3) & ~1;
243 }
244
245 static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
246 {
247         struct pasemi_mac_rxring *ring;
248         struct pasemi_mac *mac = netdev_priv(dev);
249         int chno;
250         unsigned int cfg;
251
252         ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
253                                      offsetof(struct pasemi_mac_rxring, chan));
254
255         if (!ring) {
256                 dev_err(&mac->pdev->dev, "Can't allocate RX channel\n");
257                 goto out_chan;
258         }
259         chno = ring->chan.chno;
260
261         spin_lock_init(&ring->lock);
262
263         ring->size = RX_RING_SIZE;
264         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
265                                   RX_RING_SIZE, GFP_KERNEL);
266
267         if (!ring->ring_info)
268                 goto out_ring_info;
269
270         /* Allocate descriptors */
271         if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
272                 goto out_ring_desc;
273
274         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
275                                            RX_RING_SIZE * sizeof(u64),
276                                            &ring->buf_dma, GFP_KERNEL);
277         if (!ring->buffers)
278                 goto out_ring_desc;
279
280         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
281
282         write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno),
283                       PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma));
284
285         write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno),
286                       PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) |
287                       PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
288
289         cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
290
291         if (translation_enabled())
292                 cfg |= PAS_DMA_RXCHAN_CFG_CTR;
293
294         write_dma_reg(PAS_DMA_RXCHAN_CFG(chno), cfg);
295
296         write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if),
297                       PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
298
299         write_dma_reg(PAS_DMA_RXINT_BASEU(mac->dma_if),
300                       PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
301                       PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
302
303         cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 |
304               PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
305               PAS_DMA_RXINT_CFG_HEN;
306
307         if (translation_enabled())
308                 cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;
309
310         write_dma_reg(PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
311
312         ring->next_to_fill = 0;
313         ring->next_to_clean = 0;
314         ring->mac = mac;
315         mac->rx = ring;
316
317         return 0;
318
319 out_ring_desc:
320         kfree(ring->ring_info);
321 out_ring_info:
322         pasemi_dma_free_chan(&ring->chan);
323 out_chan:
324         return -ENOMEM;
325 }
326
327 static struct pasemi_mac_txring *
328 pasemi_mac_setup_tx_resources(const struct net_device *dev)
329 {
330         struct pasemi_mac *mac = netdev_priv(dev);
331         u32 val;
332         struct pasemi_mac_txring *ring;
333         unsigned int cfg;
334         int chno;
335
336         ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),
337                                      offsetof(struct pasemi_mac_txring, chan));
338
339         if (!ring) {
340                 dev_err(&mac->pdev->dev, "Can't allocate TX channel\n");
341                 goto out_chan;
342         }
343
344         chno = ring->chan.chno;
345
346         spin_lock_init(&ring->lock);
347
348         ring->size = TX_RING_SIZE;
349         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
350                                   TX_RING_SIZE, GFP_KERNEL);
351         if (!ring->ring_info)
352                 goto out_ring_info;
353
354         /* Allocate descriptors */
355         if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE))
356                 goto out_ring_desc;
357
358         write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
359                       PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
360         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
361         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
362
363         write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
364
365         cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
366               PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
367               PAS_DMA_TXCHAN_CFG_UP |
368               PAS_DMA_TXCHAN_CFG_WT(2);
369
370         if (translation_enabled())
371                 cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
372
373         write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
374
375         ring->next_to_fill = 0;
376         ring->next_to_clean = 0;
377         ring->mac = mac;
378
379         return ring;
380
381 out_ring_desc:
382         kfree(ring->ring_info);
383 out_ring_info:
384         pasemi_dma_free_chan(&ring->chan);
385 out_chan:
386         return NULL;
387 }
388
389 static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
390 {
391         struct pasemi_mac_txring *txring = tx_ring(mac);
392         unsigned int i, j;
393         struct pasemi_mac_buffer *info;
394         dma_addr_t dmas[MAX_SKB_FRAGS+1];
395         int freed;
396         int start, limit;
397
398         start = txring->next_to_clean;
399         limit = txring->next_to_fill;
400
401         /* Compensate for when fill has wrapped and clean has not */
402         if (start > limit)
403                 limit += TX_RING_SIZE;
404
405         for (i = start; i < limit; i += freed) {
406                 info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
407                 if (info->dma && info->skb) {
408                         for (j = 0; j <= skb_shinfo(info->skb)->nr_frags; j++)
409                                 dmas[j] = txring->ring_info[(i+1+j) &
410                                                 (TX_RING_SIZE-1)].dma;
411                         freed = pasemi_mac_unmap_tx_skb(mac, info->skb, dmas);
412                 } else
413                         freed = 2;
414         }
415
416         kfree(txring->ring_info);
417         pasemi_dma_free_chan(&txring->chan);
418
419 }
420
421 static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
422 {
423         struct pasemi_mac_rxring *rx = rx_ring(mac);
424         unsigned int i;
425         struct pasemi_mac_buffer *info;
426
427         for (i = 0; i < RX_RING_SIZE; i++) {
428                 info = &RX_DESC_INFO(rx, i);
429                 if (info->skb && info->dma) {
430                         pci_unmap_single(mac->dma_pdev,
431                                          info->dma,
432                                          info->skb->len,
433                                          PCI_DMA_FROMDEVICE);
434                         dev_kfree_skb_any(info->skb);
435                 }
436                 info->dma = 0;
437                 info->skb = NULL;
438         }
439
440         for (i = 0; i < RX_RING_SIZE; i++)
441                 RX_DESC(rx, i) = 0;
442
443         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
444                           rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
445
446         kfree(rx_ring(mac)->ring_info);
447         pasemi_dma_free_chan(&rx_ring(mac)->chan);
448         mac->rx = NULL;
449 }
450
451 static void pasemi_mac_replenish_rx_ring(const struct net_device *dev,
452                                          const int limit)
453 {
454         const struct pasemi_mac *mac = netdev_priv(dev);
455         struct pasemi_mac_rxring *rx = rx_ring(mac);
456         int fill, count;
457
458         if (limit <= 0)
459                 return;
460
461         fill = rx_ring(mac)->next_to_fill;
462         for (count = 0; count < limit; count++) {
463                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
464                 u64 *buff = &RX_BUFF(rx, fill);
465                 struct sk_buff *skb;
466                 dma_addr_t dma;
467
468                 /* Entry in use? */
469                 WARN_ON(*buff);
470
471                 /* skb might still be in there for recycle on short receives */
472                 if (info->skb)
473                         skb = info->skb;
474                 else {
475                         skb = dev_alloc_skb(BUF_SIZE);
476                         skb_reserve(skb, LOCAL_SKB_ALIGN);
477                 }
478
479                 if (unlikely(!skb))
480                         break;
481
482                 dma = pci_map_single(mac->dma_pdev, skb->data,
483                                      BUF_SIZE - LOCAL_SKB_ALIGN,
484                                      PCI_DMA_FROMDEVICE);
485
486                 if (unlikely(dma_mapping_error(dma))) {
487                         dev_kfree_skb_irq(info->skb);
488                         break;
489                 }
490
491                 info->skb = skb;
492                 info->dma = dma;
493                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
494                 fill++;
495         }
496
497         wmb();
498
499         write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count);
500
501         rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
502                                 (RX_RING_SIZE - 1);
503 }
504
505 static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
506 {
507         struct pasemi_mac_rxring *rx = rx_ring(mac);
508         unsigned int reg, pcnt;
509         /* Re-enable packet count interrupts: finally
510          * ack the packet count interrupt we got in rx_intr.
511          */
512
513         pcnt = *rx->chan.status & PAS_STATUS_PCNT_M;
514
515         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
516
517         if (*rx->chan.status & PAS_STATUS_TIMER)
518                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
519
520         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
521 }
522
523 static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
524 {
525         unsigned int reg, pcnt;
526
527         /* Re-enable packet count interrupts */
528         pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M;
529
530         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
531
532         write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg);
533 }
534
535
536 static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
537                                        const u64 macrx)
538 {
539         unsigned int rcmdsta, ccmdsta;
540         struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
541
542         if (!netif_msg_rx_err(mac))
543                 return;
544
545         rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
546         ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno));
547
548         printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
549                 macrx, *chan->status);
550
551         printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
552                 rcmdsta, ccmdsta);
553 }
554
555 static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
556                                        const u64 mactx)
557 {
558         unsigned int cmdsta;
559         struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
560
561         if (!netif_msg_tx_err(mac))
562                 return;
563
564         cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno));
565
566         printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
567                 "tx status 0x%016lx\n", mactx, *chan->status);
568
569         printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
570 }
571
572 static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
573                                const int limit)
574 {
575         const struct pasemi_dmachan *chan = &rx->chan;
576         struct pasemi_mac *mac = rx->mac;
577         struct pci_dev *pdev = mac->dma_pdev;
578         unsigned int n;
579         int count, buf_index, tot_bytes, packets;
580         struct pasemi_mac_buffer *info;
581         struct sk_buff *skb;
582         unsigned int len;
583         u64 macrx, eval;
584         dma_addr_t dma;
585
586         tot_bytes = 0;
587         packets = 0;
588
589         spin_lock(&rx->lock);
590
591         n = rx->next_to_clean;
592
593         prefetch(&RX_DESC(rx, n));
594
595         for (count = 0; count < limit; count++) {
596                 macrx = RX_DESC(rx, n);
597                 prefetch(&RX_DESC(rx, n+4));
598
599                 if ((macrx & XCT_MACRX_E) ||
600                     (*chan->status & PAS_STATUS_ERROR))
601                         pasemi_mac_rx_error(mac, macrx);
602
603                 if (!(macrx & XCT_MACRX_O))
604                         break;
605
606                 info = NULL;
607
608                 BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));
609
610                 eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
611                         XCT_RXRES_8B_EVAL_S;
612                 buf_index = eval-1;
613
614                 dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
615                 info = &RX_DESC_INFO(rx, buf_index);
616
617                 skb = info->skb;
618
619                 prefetch_skb(skb);
620
621                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
622
623                 pci_unmap_single(pdev, dma, BUF_SIZE-LOCAL_SKB_ALIGN,
624                                  PCI_DMA_FROMDEVICE);
625
626                 if (macrx & XCT_MACRX_CRC) {
627                         /* CRC error flagged */
628                         mac->netdev->stats.rx_errors++;
629                         mac->netdev->stats.rx_crc_errors++;
630                         /* No need to free skb, it'll be reused */
631                         goto next;
632                 }
633
634                 if (len < 256) {
635                         struct sk_buff *new_skb;
636
637                         new_skb = netdev_alloc_skb(mac->netdev,
638                                                    len + LOCAL_SKB_ALIGN);
639                         if (new_skb) {
640                                 skb_reserve(new_skb, LOCAL_SKB_ALIGN);
641                                 memcpy(new_skb->data, skb->data, len);
642                                 /* save the skb in buffer_info as good */
643                                 skb = new_skb;
644                         }
645                         /* else just continue with the old one */
646                 } else
647                         info->skb = NULL;
648
649                 info->dma = 0;
650
651                 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
652                         skb->ip_summed = CHECKSUM_UNNECESSARY;
653                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
654                                            XCT_MACRX_CSUM_S;
655                 } else
656                         skb->ip_summed = CHECKSUM_NONE;
657
658                 packets++;
659                 tot_bytes += len;
660
661                 /* Don't include CRC */
662                 skb_put(skb, len-4);
663
664                 skb->protocol = eth_type_trans(skb, mac->netdev);
665                 netif_receive_skb(skb);
666
667 next:
668                 RX_DESC(rx, n) = 0;
669                 RX_DESC(rx, n+1) = 0;
670
671                 /* Need to zero it out since hardware doesn't, since the
672                  * replenish loop uses it to tell when it's done.
673                  */
674                 RX_BUFF(rx, buf_index) = 0;
675
676                 n += 4;
677         }
678
679         if (n > RX_RING_SIZE) {
680                 /* Errata 5971 workaround: L2 target of headers */
681                 write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0);
682                 n &= (RX_RING_SIZE-1);
683         }
684
685         rx_ring(mac)->next_to_clean = n;
686
687         /* Increase is in number of 16-byte entries, and since each descriptor
688          * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
689          * count*2.
690          */
691         write_dma_reg(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1);
692
693         pasemi_mac_replenish_rx_ring(mac->netdev, count);
694
695         mac->netdev->stats.rx_bytes += tot_bytes;
696         mac->netdev->stats.rx_packets += packets;
697
698         spin_unlock(&rx_ring(mac)->lock);
699
700         return count;
701 }
702
703 /* Can't make this too large or we blow the kernel stack limits */
704 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
705
706 static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring)
707 {
708         struct pasemi_dmachan *chan = &txring->chan;
709         struct pasemi_mac *mac = txring->mac;
710         int i, j;
711         unsigned int start, descr_count, buf_count, batch_limit;
712         unsigned int ring_limit;
713         unsigned int total_count;
714         unsigned long flags;
715         struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
716         dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
717
718         total_count = 0;
719         batch_limit = TX_CLEAN_BATCHSIZE;
720 restart:
721         spin_lock_irqsave(&txring->lock, flags);
722
723         start = txring->next_to_clean;
724         ring_limit = txring->next_to_fill;
725
726         /* Compensate for when fill has wrapped but clean has not */
727         if (start > ring_limit)
728                 ring_limit += TX_RING_SIZE;
729
730         buf_count = 0;
731         descr_count = 0;
732
733         for (i = start;
734              descr_count < batch_limit && i < ring_limit;
735              i += buf_count) {
736                 u64 mactx = TX_DESC(txring, i);
737                 struct sk_buff *skb;
738
739                 if ((mactx  & XCT_MACTX_E) ||
740                     (*chan->status & PAS_STATUS_ERROR))
741                         pasemi_mac_tx_error(mac, mactx);
742
743                 if (unlikely(mactx & XCT_MACTX_O))
744                         /* Not yet transmitted */
745                         break;
746
747                 skb = TX_DESC_INFO(txring, i+1).skb;
748                 skbs[descr_count] = skb;
749
750                 buf_count = 2 + skb_shinfo(skb)->nr_frags;
751                 for (j = 0; j <= skb_shinfo(skb)->nr_frags; j++)
752                         dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
753
754                 TX_DESC(txring, i) = 0;
755                 TX_DESC(txring, i+1) = 0;
756
757                 /* Since we always fill with an even number of entries, make
758                  * sure we skip any unused one at the end as well.
759                  */
760                 if (buf_count & 1)
761                         buf_count++;
762                 descr_count++;
763         }
764         txring->next_to_clean = i & (TX_RING_SIZE-1);
765
766         spin_unlock_irqrestore(&txring->lock, flags);
767         netif_wake_queue(mac->netdev);
768
769         for (i = 0; i < descr_count; i++)
770                 pasemi_mac_unmap_tx_skb(mac, skbs[i], dmas[i]);
771
772         total_count += descr_count;
773
774         /* If the batch was full, try to clean more */
775         if (descr_count == batch_limit)
776                 goto restart;
777
778         return total_count;
779 }
780
781
782 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
783 {
784         const struct pasemi_mac_rxring *rxring = data;
785         struct pasemi_mac *mac = rxring->mac;
786         struct net_device *dev = mac->netdev;
787         const struct pasemi_dmachan *chan = &rxring->chan;
788         unsigned int reg;
789
790         if (!(*chan->status & PAS_STATUS_CAUSE_M))
791                 return IRQ_NONE;
792
793         /* Don't reset packet count so it won't fire again but clear
794          * all others.
795          */
796
797         reg = 0;
798         if (*chan->status & PAS_STATUS_SOFT)
799                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
800         if (*chan->status & PAS_STATUS_ERROR)
801                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
802
803         netif_rx_schedule(dev, &mac->napi);
804
805         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg);
806
807         return IRQ_HANDLED;
808 }
809
810 #define TX_CLEAN_INTERVAL HZ
811
812 static void pasemi_mac_tx_timer(unsigned long data)
813 {
814         struct pasemi_mac_txring *txring = (struct pasemi_mac_txring *)data;
815         struct pasemi_mac *mac = txring->mac;
816
817         pasemi_mac_clean_tx(txring);
818
819         mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL);
820
821         pasemi_mac_restart_tx_intr(mac);
822 }
823
824 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
825 {
826         struct pasemi_mac_txring *txring = data;
827         const struct pasemi_dmachan *chan = &txring->chan;
828         struct pasemi_mac *mac = txring->mac;
829         unsigned int reg;
830
831         if (!(*chan->status & PAS_STATUS_CAUSE_M))
832                 return IRQ_NONE;
833
834         reg = 0;
835
836         if (*chan->status & PAS_STATUS_SOFT)
837                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
838         if (*chan->status & PAS_STATUS_ERROR)
839                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
840
841         mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2);
842
843         netif_rx_schedule(mac->netdev, &mac->napi);
844
845         if (reg)
846                 write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), reg);
847
848         return IRQ_HANDLED;
849 }
850
851 static void pasemi_adjust_link(struct net_device *dev)
852 {
853         struct pasemi_mac *mac = netdev_priv(dev);
854         int msg;
855         unsigned int flags;
856         unsigned int new_flags;
857
858         if (!mac->phydev->link) {
859                 /* If no link, MAC speed settings don't matter. Just report
860                  * link down and return.
861                  */
862                 if (mac->link && netif_msg_link(mac))
863                         printk(KERN_INFO "%s: Link is down.\n", dev->name);
864
865                 netif_carrier_off(dev);
866                 mac->link = 0;
867
868                 return;
869         } else
870                 netif_carrier_on(dev);
871
872         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
873         new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
874                               PAS_MAC_CFG_PCFG_TSR_M);
875
876         if (!mac->phydev->duplex)
877                 new_flags |= PAS_MAC_CFG_PCFG_HD;
878
879         switch (mac->phydev->speed) {
880         case 1000:
881                 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
882                              PAS_MAC_CFG_PCFG_TSR_1G;
883                 break;
884         case 100:
885                 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
886                              PAS_MAC_CFG_PCFG_TSR_100M;
887                 break;
888         case 10:
889                 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
890                              PAS_MAC_CFG_PCFG_TSR_10M;
891                 break;
892         default:
893                 printk("Unsupported speed %d\n", mac->phydev->speed);
894         }
895
896         /* Print on link or speed/duplex change */
897         msg = mac->link != mac->phydev->link || flags != new_flags;
898
899         mac->duplex = mac->phydev->duplex;
900         mac->speed = mac->phydev->speed;
901         mac->link = mac->phydev->link;
902
903         if (new_flags != flags)
904                 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
905
906         if (msg && netif_msg_link(mac))
907                 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
908                        dev->name, mac->speed, mac->duplex ? "full" : "half");
909 }
910
911 static int pasemi_mac_phy_init(struct net_device *dev)
912 {
913         struct pasemi_mac *mac = netdev_priv(dev);
914         struct device_node *dn, *phy_dn;
915         struct phy_device *phydev;
916         unsigned int phy_id;
917         const phandle *ph;
918         const unsigned int *prop;
919         struct resource r;
920         int ret;
921
922         dn = pci_device_to_OF_node(mac->pdev);
923         ph = of_get_property(dn, "phy-handle", NULL);
924         if (!ph)
925                 return -ENODEV;
926         phy_dn = of_find_node_by_phandle(*ph);
927
928         prop = of_get_property(phy_dn, "reg", NULL);
929         ret = of_address_to_resource(phy_dn->parent, 0, &r);
930         if (ret)
931                 goto err;
932
933         phy_id = *prop;
934         snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
935
936         of_node_put(phy_dn);
937
938         mac->link = 0;
939         mac->speed = 0;
940         mac->duplex = -1;
941
942         phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
943
944         if (IS_ERR(phydev)) {
945                 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
946                 return PTR_ERR(phydev);
947         }
948
949         mac->phydev = phydev;
950
951         return 0;
952
953 err:
954         of_node_put(phy_dn);
955         return -ENODEV;
956 }
957
958
959 static int pasemi_mac_open(struct net_device *dev)
960 {
961         struct pasemi_mac *mac = netdev_priv(dev);
962         unsigned int flags;
963         int ret;
964
965         /* enable rx section */
966         write_dma_reg(PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
967
968         /* enable tx section */
969         write_dma_reg(PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
970
971         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
972                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
973                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
974
975         write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
976
977         ret = pasemi_mac_setup_rx_resources(dev);
978         if (ret)
979                 goto out_rx_resources;
980
981         mac->tx = pasemi_mac_setup_tx_resources(dev);
982
983         if (!mac->tx)
984                 goto out_tx_ring;
985
986         /* 0x3ff with 33MHz clock is about 31us */
987         write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG,
988                       PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff));
989
990         write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno),
991                       PAS_IOB_DMA_RXCH_CFG_CNTTH(128));
992
993         write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno),
994                       PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
995
996         write_mac_reg(mac, PAS_MAC_IPC_CHNL,
997                       PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) |
998                       PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno));
999
1000         /* enable rx if */
1001         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1002                       PAS_DMA_RXINT_RCMDSTA_EN |
1003                       PAS_DMA_RXINT_RCMDSTA_DROPS_M |
1004                       PAS_DMA_RXINT_RCMDSTA_BP |
1005                       PAS_DMA_RXINT_RCMDSTA_OO |
1006                       PAS_DMA_RXINT_RCMDSTA_BT);
1007
1008         /* enable rx channel */
1009         pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU |
1010                                                    PAS_DMA_RXCHAN_CCMDSTA_OD |
1011                                                    PAS_DMA_RXCHAN_CCMDSTA_FD |
1012                                                    PAS_DMA_RXCHAN_CCMDSTA_DT);
1013
1014         /* enable tx channel */
1015         pasemi_dma_start_chan(&tx_ring(mac)->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
1016                                                    PAS_DMA_TXCHAN_TCMDSTA_DB |
1017                                                    PAS_DMA_TXCHAN_TCMDSTA_DE |
1018                                                    PAS_DMA_TXCHAN_TCMDSTA_DA);
1019
1020         pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
1021
1022         write_dma_reg(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno),
1023                       RX_RING_SIZE>>1);
1024
1025         /* Clear out any residual packet count state from firmware */
1026         pasemi_mac_restart_rx_intr(mac);
1027         pasemi_mac_restart_tx_intr(mac);
1028
1029         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
1030                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
1031
1032         if (mac->type == MAC_TYPE_GMAC)
1033                 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
1034         else
1035                 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
1036
1037         /* Enable interface in MAC */
1038         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1039
1040         ret = pasemi_mac_phy_init(dev);
1041         /* Some configs don't have PHYs (XAUI etc), so don't complain about
1042          * failed init due to -ENODEV.
1043          */
1044         if (ret && ret != -ENODEV)
1045                 dev_warn(&mac->pdev->dev, "phy init failed: %d\n", ret);
1046
1047         netif_start_queue(dev);
1048         napi_enable(&mac->napi);
1049
1050         snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
1051                  dev->name);
1052
1053         ret = request_irq(mac->tx->chan.irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
1054                           mac->tx_irq_name, mac->tx);
1055         if (ret) {
1056                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1057                         mac->tx->chan.irq, ret);
1058                 goto out_tx_int;
1059         }
1060
1061         snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
1062                  dev->name);
1063
1064         ret = request_irq(mac->rx->chan.irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
1065                           mac->rx_irq_name, mac->rx);
1066         if (ret) {
1067                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1068                         mac->rx->chan.irq, ret);
1069                 goto out_rx_int;
1070         }
1071
1072         if (mac->phydev)
1073                 phy_start(mac->phydev);
1074
1075         init_timer(&mac->tx->clean_timer);
1076         mac->tx->clean_timer.function = pasemi_mac_tx_timer;
1077         mac->tx->clean_timer.data = (unsigned long)mac->tx;
1078         mac->tx->clean_timer.expires = jiffies+HZ;
1079         add_timer(&mac->tx->clean_timer);
1080
1081         return 0;
1082
1083 out_rx_int:
1084         free_irq(mac->tx->chan.irq, mac->tx);
1085 out_tx_int:
1086         napi_disable(&mac->napi);
1087         netif_stop_queue(dev);
1088 out_tx_ring:
1089         if (mac->tx)
1090                 pasemi_mac_free_tx_resources(mac);
1091         pasemi_mac_free_rx_resources(mac);
1092 out_rx_resources:
1093
1094         return ret;
1095 }
1096
1097 #define MAX_RETRIES 5000
1098
1099 static int pasemi_mac_close(struct net_device *dev)
1100 {
1101         struct pasemi_mac *mac = netdev_priv(dev);
1102         unsigned int sta;
1103         int retries;
1104         int rxch, txch;
1105
1106         rxch = rx_ring(mac)->chan.chno;
1107         txch = tx_ring(mac)->chan.chno;
1108
1109         if (mac->phydev) {
1110                 phy_stop(mac->phydev);
1111                 phy_disconnect(mac->phydev);
1112         }
1113
1114         del_timer_sync(&mac->tx->clean_timer);
1115
1116         netif_stop_queue(dev);
1117         napi_disable(&mac->napi);
1118
1119         sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1120         if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
1121                       PAS_DMA_RXINT_RCMDSTA_OO |
1122                       PAS_DMA_RXINT_RCMDSTA_BT))
1123                 printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);
1124
1125         sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1126         if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
1127                      PAS_DMA_RXCHAN_CCMDSTA_OD |
1128                      PAS_DMA_RXCHAN_CCMDSTA_FD |
1129                      PAS_DMA_RXCHAN_CCMDSTA_DT))
1130                 printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);
1131
1132         sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1133         if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB |
1134                       PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA))
1135                 printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);
1136
1137         /* Clean out any pending buffers */
1138         pasemi_mac_clean_tx(tx_ring(mac));
1139         pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1140
1141         /* Disable interface */
1142         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch),
1143                       PAS_DMA_TXCHAN_TCMDSTA_ST);
1144         write_dma_reg( PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1145                       PAS_DMA_RXINT_RCMDSTA_ST);
1146         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch),
1147                       PAS_DMA_RXCHAN_CCMDSTA_ST);
1148
1149         for (retries = 0; retries < MAX_RETRIES; retries++) {
1150                 sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(rxch));
1151                 if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1152                         break;
1153                 cond_resched();
1154         }
1155
1156         if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1157                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
1158
1159         for (retries = 0; retries < MAX_RETRIES; retries++) {
1160                 sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1161                 if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1162                         break;
1163                 cond_resched();
1164         }
1165
1166         if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1167                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
1168
1169         for (retries = 0; retries < MAX_RETRIES; retries++) {
1170                 sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1171                 if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
1172                         break;
1173                 cond_resched();
1174         }
1175
1176         if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
1177                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
1178
1179         /* Then, disable the channel. This must be done separately from
1180          * stopping, since you can't disable when active.
1181          */
1182
1183         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0);
1184         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0);
1185         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1186
1187         free_irq(mac->tx->chan.irq, mac->tx);
1188         free_irq(mac->rx->chan.irq, mac->rx);
1189
1190         /* Free resources */
1191         pasemi_mac_free_rx_resources(mac);
1192         pasemi_mac_free_tx_resources(mac);
1193
1194         return 0;
1195 }
1196
1197 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1198 {
1199         struct pasemi_mac *mac = netdev_priv(dev);
1200         struct pasemi_mac_txring *txring;
1201         u64 dflags, mactx;
1202         dma_addr_t map[MAX_SKB_FRAGS+1];
1203         unsigned int map_size[MAX_SKB_FRAGS+1];
1204         unsigned long flags;
1205         int i, nfrags;
1206         int fill;
1207
1208         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
1209
1210         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1211                 const unsigned char *nh = skb_network_header(skb);
1212
1213                 switch (ip_hdr(skb)->protocol) {
1214                 case IPPROTO_TCP:
1215                         dflags |= XCT_MACTX_CSUM_TCP;
1216                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1217                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1218                         break;
1219                 case IPPROTO_UDP:
1220                         dflags |= XCT_MACTX_CSUM_UDP;
1221                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1222                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1223                         break;
1224                 }
1225         }
1226
1227         nfrags = skb_shinfo(skb)->nr_frags;
1228
1229         map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
1230                                 PCI_DMA_TODEVICE);
1231         map_size[0] = skb_headlen(skb);
1232         if (dma_mapping_error(map[0]))
1233                 goto out_err_nolock;
1234
1235         for (i = 0; i < nfrags; i++) {
1236                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1237
1238                 map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
1239                                         frag->page_offset, frag->size,
1240                                         PCI_DMA_TODEVICE);
1241                 map_size[i+1] = frag->size;
1242                 if (dma_mapping_error(map[i+1])) {
1243                         nfrags = i;
1244                         goto out_err_nolock;
1245                 }
1246         }
1247
1248         mactx = dflags | XCT_MACTX_LLEN(skb->len);
1249
1250         txring = tx_ring(mac);
1251
1252         spin_lock_irqsave(&txring->lock, flags);
1253
1254         fill = txring->next_to_fill;
1255
1256         /* Avoid stepping on the same cache line that the DMA controller
1257          * is currently about to send, so leave at least 8 words available.
1258          * Total free space needed is mactx + fragments + 8
1259          */
1260         if (RING_AVAIL(txring) < nfrags + 10) {
1261                 /* no room -- stop the queue and wait for tx intr */
1262                 netif_stop_queue(dev);
1263                 goto out_err;
1264         }
1265
1266         TX_DESC(txring, fill) = mactx;
1267         fill++;
1268         TX_DESC_INFO(txring, fill).skb = skb;
1269         for (i = 0; i <= nfrags; i++) {
1270                 TX_DESC(txring, fill+i) =
1271                         XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1272                 TX_DESC_INFO(txring, fill+i).dma = map[i];
1273         }
1274
1275         /* We have to add an even number of 8-byte entries to the ring
1276          * even if the last one is unused. That means always an odd number
1277          * of pointers + one mactx descriptor.
1278          */
1279         if (nfrags & 1)
1280                 nfrags++;
1281
1282         txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1);
1283
1284         dev->stats.tx_packets++;
1285         dev->stats.tx_bytes += skb->len;
1286
1287         spin_unlock_irqrestore(&txring->lock, flags);
1288
1289         write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (nfrags+2) >> 1);
1290
1291         return NETDEV_TX_OK;
1292
1293 out_err:
1294         spin_unlock_irqrestore(&txring->lock, flags);
1295 out_err_nolock:
1296         while (nfrags--)
1297                 pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
1298                                  PCI_DMA_TODEVICE);
1299
1300         return NETDEV_TX_BUSY;
1301 }
1302
1303 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1304 {
1305         const struct pasemi_mac *mac = netdev_priv(dev);
1306         unsigned int flags;
1307
1308         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1309
1310         /* Set promiscuous */
1311         if (dev->flags & IFF_PROMISC)
1312                 flags |= PAS_MAC_CFG_PCFG_PR;
1313         else
1314                 flags &= ~PAS_MAC_CFG_PCFG_PR;
1315
1316         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1317 }
1318
1319
1320 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1321 {
1322         struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1323         struct net_device *dev = mac->netdev;
1324         int pkts;
1325
1326         pasemi_mac_clean_tx(tx_ring(mac));
1327         pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
1328         if (pkts < budget) {
1329                 /* all done, no more packets present */
1330                 netif_rx_complete(dev, napi);
1331
1332                 pasemi_mac_restart_rx_intr(mac);
1333                 pasemi_mac_restart_tx_intr(mac);
1334         }
1335         return pkts;
1336 }
1337
1338 static int __devinit
1339 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1340 {
1341         struct net_device *dev;
1342         struct pasemi_mac *mac;
1343         int err;
1344         DECLARE_MAC_BUF(mac_buf);
1345
1346         err = pci_enable_device(pdev);
1347         if (err)
1348                 return err;
1349
1350         dev = alloc_etherdev(sizeof(struct pasemi_mac));
1351         if (dev == NULL) {
1352                 dev_err(&pdev->dev,
1353                         "pasemi_mac: Could not allocate ethernet device.\n");
1354                 err = -ENOMEM;
1355                 goto out_disable_device;
1356         }
1357
1358         pci_set_drvdata(pdev, dev);
1359         SET_NETDEV_DEV(dev, &pdev->dev);
1360
1361         mac = netdev_priv(dev);
1362
1363         mac->pdev = pdev;
1364         mac->netdev = dev;
1365
1366         netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
1367
1368         dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG |
1369                         NETIF_F_HIGHDMA;
1370
1371         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1372         if (!mac->dma_pdev) {
1373                 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1374                 err = -ENODEV;
1375                 goto out;
1376         }
1377
1378         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1379         if (!mac->iob_pdev) {
1380                 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1381                 err = -ENODEV;
1382                 goto out;
1383         }
1384
1385         /* get mac addr from device tree */
1386         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1387                 err = -ENODEV;
1388                 goto out;
1389         }
1390         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1391
1392         mac->dma_if = mac_to_intf(mac);
1393         if (mac->dma_if < 0) {
1394                 dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
1395                 err = -ENODEV;
1396                 goto out;
1397         }
1398
1399         switch (pdev->device) {
1400         case 0xa005:
1401                 mac->type = MAC_TYPE_GMAC;
1402                 break;
1403         case 0xa006:
1404                 mac->type = MAC_TYPE_XAUI;
1405                 break;
1406         default:
1407                 err = -ENODEV;
1408                 goto out;
1409         }
1410
1411         dev->open = pasemi_mac_open;
1412         dev->stop = pasemi_mac_close;
1413         dev->hard_start_xmit = pasemi_mac_start_tx;
1414         dev->set_multicast_list = pasemi_mac_set_rx_mode;
1415
1416         if (err)
1417                 goto out;
1418
1419         mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1420
1421         /* Enable most messages by default */
1422         mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1423
1424         err = register_netdev(dev);
1425
1426         if (err) {
1427                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1428                         err);
1429                 goto out;
1430         } else if netif_msg_probe(mac)
1431                 printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %s\n",
1432                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1433                        mac->dma_if, print_mac(mac_buf, dev->dev_addr));
1434
1435         return err;
1436
1437 out:
1438         if (mac->iob_pdev)
1439                 pci_dev_put(mac->iob_pdev);
1440         if (mac->dma_pdev)
1441                 pci_dev_put(mac->dma_pdev);
1442
1443         free_netdev(dev);
1444 out_disable_device:
1445         pci_disable_device(pdev);
1446         return err;
1447
1448 }
1449
1450 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1451 {
1452         struct net_device *netdev = pci_get_drvdata(pdev);
1453         struct pasemi_mac *mac;
1454
1455         if (!netdev)
1456                 return;
1457
1458         mac = netdev_priv(netdev);
1459
1460         unregister_netdev(netdev);
1461
1462         pci_disable_device(pdev);
1463         pci_dev_put(mac->dma_pdev);
1464         pci_dev_put(mac->iob_pdev);
1465
1466         pasemi_dma_free_chan(&mac->tx->chan);
1467         pasemi_dma_free_chan(&mac->rx->chan);
1468
1469         pci_set_drvdata(pdev, NULL);
1470         free_netdev(netdev);
1471 }
1472
1473 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1474         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1475         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1476         { },
1477 };
1478
1479 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1480
1481 static struct pci_driver pasemi_mac_driver = {
1482         .name           = "pasemi_mac",
1483         .id_table       = pasemi_mac_pci_tbl,
1484         .probe          = pasemi_mac_probe,
1485         .remove         = __devexit_p(pasemi_mac_remove),
1486 };
1487
1488 static void __exit pasemi_mac_cleanup_module(void)
1489 {
1490         pci_unregister_driver(&pasemi_mac_driver);
1491 }
1492
1493 int pasemi_mac_init_module(void)
1494 {
1495         int err;
1496
1497         err = pasemi_dma_init();
1498         if (err)
1499                 return err;
1500
1501         return pci_register_driver(&pasemi_mac_driver);
1502 }
1503
1504 module_init(pasemi_mac_init_module);
1505 module_exit(pasemi_mac_cleanup_module);