rtl8180_dev.c: add support for 1799:700f
[linux-2.6] / 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 #include <linux/inet_lro.h>
36
37 #include <asm/irq.h>
38 #include <asm/firmware.h>
39 #include <asm/pasemi_dma.h>
40
41 #include "pasemi_mac.h"
42
43 /* We have our own align, since ppc64 in general has it at 0 because
44  * of design flaws in some of the server bridge chips. However, for
45  * PWRficient doing the unaligned copies is more expensive than doing
46  * unaligned DMA, so make sure the data is aligned instead.
47  */
48 #define LOCAL_SKB_ALIGN 2
49
50 /* TODO list
51  *
52  * - Multicast support
53  * - Large MTU support
54  * - SW LRO
55  * - Multiqueue RX/TX
56  */
57
58
59 /* Must be a power of two */
60 #define RX_RING_SIZE 2048
61 #define TX_RING_SIZE 4096
62
63 #define LRO_MAX_AGGR 64
64
65 #define DEFAULT_MSG_ENABLE        \
66         (NETIF_MSG_DRV          | \
67          NETIF_MSG_PROBE        | \
68          NETIF_MSG_LINK         | \
69          NETIF_MSG_TIMER        | \
70          NETIF_MSG_IFDOWN       | \
71          NETIF_MSG_IFUP         | \
72          NETIF_MSG_RX_ERR       | \
73          NETIF_MSG_TX_ERR)
74
75 #define TX_DESC(tx, num)        ((tx)->chan.ring_virt[(num) & (TX_RING_SIZE-1)])
76 #define TX_DESC_INFO(tx, num)   ((tx)->ring_info[(num) & (TX_RING_SIZE-1)])
77 #define RX_DESC(rx, num)        ((rx)->chan.ring_virt[(num) & (RX_RING_SIZE-1)])
78 #define RX_DESC_INFO(rx, num)   ((rx)->ring_info[(num) & (RX_RING_SIZE-1)])
79 #define RX_BUFF(rx, num)        ((rx)->buffers[(num) & (RX_RING_SIZE-1)])
80
81 #define RING_USED(ring)         (((ring)->next_to_fill - (ring)->next_to_clean) \
82                                  & ((ring)->size - 1))
83 #define RING_AVAIL(ring)        ((ring->size) - RING_USED(ring))
84
85 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
86
87 MODULE_LICENSE("GPL");
88 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
89 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
90
91 static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
92 module_param(debug, int, 0);
93 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
94
95 static int translation_enabled(void)
96 {
97 #if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
98         return 1;
99 #else
100         return firmware_has_feature(FW_FEATURE_LPAR);
101 #endif
102 }
103
104 static void write_iob_reg(unsigned int reg, unsigned int val)
105 {
106         pasemi_write_iob_reg(reg, val);
107 }
108
109 static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
110 {
111         return pasemi_read_mac_reg(mac->dma_if, reg);
112 }
113
114 static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
115                           unsigned int val)
116 {
117         pasemi_write_mac_reg(mac->dma_if, reg, val);
118 }
119
120 static unsigned int read_dma_reg(unsigned int reg)
121 {
122         return pasemi_read_dma_reg(reg);
123 }
124
125 static void write_dma_reg(unsigned int reg, unsigned int val)
126 {
127         pasemi_write_dma_reg(reg, val);
128 }
129
130 static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
131 {
132         return mac->rx;
133 }
134
135 static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
136 {
137         return mac->tx;
138 }
139
140 static inline void prefetch_skb(const struct sk_buff *skb)
141 {
142         const void *d = skb;
143
144         prefetch(d);
145         prefetch(d+64);
146         prefetch(d+128);
147         prefetch(d+192);
148 }
149
150 static int mac_to_intf(struct pasemi_mac *mac)
151 {
152         struct pci_dev *pdev = mac->pdev;
153         u32 tmp;
154         int nintf, off, i, j;
155         int devfn = pdev->devfn;
156
157         tmp = read_dma_reg(PAS_DMA_CAP_IFI);
158         nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S;
159         off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S;
160
161         /* IOFF contains the offset to the registers containing the
162          * DMA interface-to-MAC-pci-id mappings, and NIN contains number
163          * of total interfaces. Each register contains 4 devfns.
164          * Just do a linear search until we find the devfn of the MAC
165          * we're trying to look up.
166          */
167
168         for (i = 0; i < (nintf+3)/4; i++) {
169                 tmp = read_dma_reg(off+4*i);
170                 for (j = 0; j < 4; j++) {
171                         if (((tmp >> (8*j)) & 0xff) == devfn)
172                                 return i*4 + j;
173                 }
174         }
175         return -1;
176 }
177
178 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
179 {
180         struct pci_dev *pdev = mac->pdev;
181         struct device_node *dn = pci_device_to_OF_node(pdev);
182         int len;
183         const u8 *maddr;
184         u8 addr[6];
185
186         if (!dn) {
187                 dev_dbg(&pdev->dev,
188                           "No device node for mac, not configuring\n");
189                 return -ENOENT;
190         }
191
192         maddr = of_get_property(dn, "local-mac-address", &len);
193
194         if (maddr && len == 6) {
195                 memcpy(mac->mac_addr, maddr, 6);
196                 return 0;
197         }
198
199         /* Some old versions of firmware mistakenly uses mac-address
200          * (and as a string) instead of a byte array in local-mac-address.
201          */
202
203         if (maddr == NULL)
204                 maddr = of_get_property(dn, "mac-address", NULL);
205
206         if (maddr == NULL) {
207                 dev_warn(&pdev->dev,
208                          "no mac address in device tree, not configuring\n");
209                 return -ENOENT;
210         }
211
212         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
213                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
214                 dev_warn(&pdev->dev,
215                          "can't parse mac address, not configuring\n");
216                 return -EINVAL;
217         }
218
219         memcpy(mac->mac_addr, addr, 6);
220
221         return 0;
222 }
223
224 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
225                        void **tcph, u64 *hdr_flags, void *data)
226 {
227         u64 macrx = (u64) data;
228         unsigned int ip_len;
229         struct iphdr *iph;
230
231         /* IPv4 header checksum failed */
232         if ((macrx & XCT_MACRX_HTY_M) != XCT_MACRX_HTY_IPV4_OK)
233                 return -1;
234
235         /* non tcp packet */
236         skb_reset_network_header(skb);
237         iph = ip_hdr(skb);
238         if (iph->protocol != IPPROTO_TCP)
239                 return -1;
240
241         ip_len = ip_hdrlen(skb);
242         skb_set_transport_header(skb, ip_len);
243         *tcph = tcp_hdr(skb);
244
245         /* check if ip header and tcp header are complete */
246         if (iph->tot_len < ip_len + tcp_hdrlen(skb))
247                 return -1;
248
249         *hdr_flags = LRO_IPV4 | LRO_TCP;
250         *iphdr = iph;
251
252         return 0;
253 }
254
255 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
256                                     const int nfrags,
257                                     struct sk_buff *skb,
258                                     const dma_addr_t *dmas)
259 {
260         int f;
261         struct pci_dev *pdev = mac->dma_pdev;
262
263         pci_unmap_single(pdev, dmas[0], skb_headlen(skb), PCI_DMA_TODEVICE);
264
265         for (f = 0; f < nfrags; f++) {
266                 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
267
268                 pci_unmap_page(pdev, dmas[f+1], frag->size, PCI_DMA_TODEVICE);
269         }
270         dev_kfree_skb_irq(skb);
271
272         /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
273          * aligned up to a power of 2
274          */
275         return (nfrags + 3) & ~1;
276 }
277
278 static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
279 {
280         struct pasemi_mac_rxring *ring;
281         struct pasemi_mac *mac = netdev_priv(dev);
282         int chno;
283         unsigned int cfg;
284
285         ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
286                                      offsetof(struct pasemi_mac_rxring, chan));
287
288         if (!ring) {
289                 dev_err(&mac->pdev->dev, "Can't allocate RX channel\n");
290                 goto out_chan;
291         }
292         chno = ring->chan.chno;
293
294         spin_lock_init(&ring->lock);
295
296         ring->size = RX_RING_SIZE;
297         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
298                                   RX_RING_SIZE, GFP_KERNEL);
299
300         if (!ring->ring_info)
301                 goto out_ring_info;
302
303         /* Allocate descriptors */
304         if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
305                 goto out_ring_desc;
306
307         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
308                                            RX_RING_SIZE * sizeof(u64),
309                                            &ring->buf_dma, GFP_KERNEL);
310         if (!ring->buffers)
311                 goto out_ring_desc;
312
313         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
314
315         write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno),
316                       PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma));
317
318         write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno),
319                       PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) |
320                       PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
321
322         cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
323
324         if (translation_enabled())
325                 cfg |= PAS_DMA_RXCHAN_CFG_CTR;
326
327         write_dma_reg(PAS_DMA_RXCHAN_CFG(chno), cfg);
328
329         write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if),
330                       PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
331
332         write_dma_reg(PAS_DMA_RXINT_BASEU(mac->dma_if),
333                       PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
334                       PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
335
336         cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 |
337               PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
338               PAS_DMA_RXINT_CFG_HEN;
339
340         if (translation_enabled())
341                 cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;
342
343         write_dma_reg(PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
344
345         ring->next_to_fill = 0;
346         ring->next_to_clean = 0;
347         ring->mac = mac;
348         mac->rx = ring;
349
350         return 0;
351
352 out_ring_desc:
353         kfree(ring->ring_info);
354 out_ring_info:
355         pasemi_dma_free_chan(&ring->chan);
356 out_chan:
357         return -ENOMEM;
358 }
359
360 static struct pasemi_mac_txring *
361 pasemi_mac_setup_tx_resources(const struct net_device *dev)
362 {
363         struct pasemi_mac *mac = netdev_priv(dev);
364         u32 val;
365         struct pasemi_mac_txring *ring;
366         unsigned int cfg;
367         int chno;
368
369         ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),
370                                      offsetof(struct pasemi_mac_txring, chan));
371
372         if (!ring) {
373                 dev_err(&mac->pdev->dev, "Can't allocate TX channel\n");
374                 goto out_chan;
375         }
376
377         chno = ring->chan.chno;
378
379         spin_lock_init(&ring->lock);
380
381         ring->size = TX_RING_SIZE;
382         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
383                                   TX_RING_SIZE, GFP_KERNEL);
384         if (!ring->ring_info)
385                 goto out_ring_info;
386
387         /* Allocate descriptors */
388         if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE))
389                 goto out_ring_desc;
390
391         write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
392                       PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
393         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
394         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
395
396         write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
397
398         cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
399               PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
400               PAS_DMA_TXCHAN_CFG_UP |
401               PAS_DMA_TXCHAN_CFG_WT(2);
402
403         if (translation_enabled())
404                 cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
405
406         write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
407
408         ring->next_to_fill = 0;
409         ring->next_to_clean = 0;
410         ring->mac = mac;
411
412         return ring;
413
414 out_ring_desc:
415         kfree(ring->ring_info);
416 out_ring_info:
417         pasemi_dma_free_chan(&ring->chan);
418 out_chan:
419         return NULL;
420 }
421
422 static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
423 {
424         struct pasemi_mac_txring *txring = tx_ring(mac);
425         unsigned int i, j;
426         struct pasemi_mac_buffer *info;
427         dma_addr_t dmas[MAX_SKB_FRAGS+1];
428         int freed, nfrags;
429         int start, limit;
430
431         start = txring->next_to_clean;
432         limit = txring->next_to_fill;
433
434         /* Compensate for when fill has wrapped and clean has not */
435         if (start > limit)
436                 limit += TX_RING_SIZE;
437
438         for (i = start; i < limit; i += freed) {
439                 info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
440                 if (info->dma && info->skb) {
441                         nfrags = skb_shinfo(info->skb)->nr_frags;
442                         for (j = 0; j <= nfrags; j++)
443                                 dmas[j] = txring->ring_info[(i+1+j) &
444                                                 (TX_RING_SIZE-1)].dma;
445                         freed = pasemi_mac_unmap_tx_skb(mac, nfrags,
446                                                         info->skb, dmas);
447                 } else
448                         freed = 2;
449         }
450
451         kfree(txring->ring_info);
452         pasemi_dma_free_chan(&txring->chan);
453
454 }
455
456 static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
457 {
458         struct pasemi_mac_rxring *rx = rx_ring(mac);
459         unsigned int i;
460         struct pasemi_mac_buffer *info;
461
462         for (i = 0; i < RX_RING_SIZE; i++) {
463                 info = &RX_DESC_INFO(rx, i);
464                 if (info->skb && info->dma) {
465                         pci_unmap_single(mac->dma_pdev,
466                                          info->dma,
467                                          info->skb->len,
468                                          PCI_DMA_FROMDEVICE);
469                         dev_kfree_skb_any(info->skb);
470                 }
471                 info->dma = 0;
472                 info->skb = NULL;
473         }
474
475         for (i = 0; i < RX_RING_SIZE; i++)
476                 RX_DESC(rx, i) = 0;
477
478         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
479                           rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
480
481         kfree(rx_ring(mac)->ring_info);
482         pasemi_dma_free_chan(&rx_ring(mac)->chan);
483         mac->rx = NULL;
484 }
485
486 static void pasemi_mac_replenish_rx_ring(const struct net_device *dev,
487                                          const int limit)
488 {
489         const struct pasemi_mac *mac = netdev_priv(dev);
490         struct pasemi_mac_rxring *rx = rx_ring(mac);
491         int fill, count;
492
493         if (limit <= 0)
494                 return;
495
496         fill = rx_ring(mac)->next_to_fill;
497         for (count = 0; count < limit; count++) {
498                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
499                 u64 *buff = &RX_BUFF(rx, fill);
500                 struct sk_buff *skb;
501                 dma_addr_t dma;
502
503                 /* Entry in use? */
504                 WARN_ON(*buff);
505
506                 skb = dev_alloc_skb(BUF_SIZE);
507                 skb_reserve(skb, LOCAL_SKB_ALIGN);
508
509                 if (unlikely(!skb))
510                         break;
511
512                 dma = pci_map_single(mac->dma_pdev, skb->data,
513                                      BUF_SIZE - LOCAL_SKB_ALIGN,
514                                      PCI_DMA_FROMDEVICE);
515
516                 if (unlikely(dma_mapping_error(dma))) {
517                         dev_kfree_skb_irq(info->skb);
518                         break;
519                 }
520
521                 info->skb = skb;
522                 info->dma = dma;
523                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
524                 fill++;
525         }
526
527         wmb();
528
529         write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count);
530
531         rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
532                                 (RX_RING_SIZE - 1);
533 }
534
535 static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
536 {
537         struct pasemi_mac_rxring *rx = rx_ring(mac);
538         unsigned int reg, pcnt;
539         /* Re-enable packet count interrupts: finally
540          * ack the packet count interrupt we got in rx_intr.
541          */
542
543         pcnt = *rx->chan.status & PAS_STATUS_PCNT_M;
544
545         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
546
547         if (*rx->chan.status & PAS_STATUS_TIMER)
548                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
549
550         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
551 }
552
553 static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
554 {
555         unsigned int reg, pcnt;
556
557         /* Re-enable packet count interrupts */
558         pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M;
559
560         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
561
562         write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg);
563 }
564
565
566 static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
567                                        const u64 macrx)
568 {
569         unsigned int rcmdsta, ccmdsta;
570         struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
571
572         if (!netif_msg_rx_err(mac))
573                 return;
574
575         rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
576         ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno));
577
578         printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
579                 macrx, *chan->status);
580
581         printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
582                 rcmdsta, ccmdsta);
583 }
584
585 static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
586                                        const u64 mactx)
587 {
588         unsigned int cmdsta;
589         struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
590
591         if (!netif_msg_tx_err(mac))
592                 return;
593
594         cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno));
595
596         printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
597                 "tx status 0x%016lx\n", mactx, *chan->status);
598
599         printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
600 }
601
602 static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
603                                const int limit)
604 {
605         const struct pasemi_dmachan *chan = &rx->chan;
606         struct pasemi_mac *mac = rx->mac;
607         struct pci_dev *pdev = mac->dma_pdev;
608         unsigned int n;
609         int count, buf_index, tot_bytes, packets;
610         struct pasemi_mac_buffer *info;
611         struct sk_buff *skb;
612         unsigned int len;
613         u64 macrx, eval;
614         dma_addr_t dma;
615
616         tot_bytes = 0;
617         packets = 0;
618
619         spin_lock(&rx->lock);
620
621         n = rx->next_to_clean;
622
623         prefetch(&RX_DESC(rx, n));
624
625         for (count = 0; count < limit; count++) {
626                 macrx = RX_DESC(rx, n);
627                 prefetch(&RX_DESC(rx, n+4));
628
629                 if ((macrx & XCT_MACRX_E) ||
630                     (*chan->status & PAS_STATUS_ERROR))
631                         pasemi_mac_rx_error(mac, macrx);
632
633                 if (!(macrx & XCT_MACRX_O))
634                         break;
635
636                 info = NULL;
637
638                 BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));
639
640                 eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
641                         XCT_RXRES_8B_EVAL_S;
642                 buf_index = eval-1;
643
644                 dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
645                 info = &RX_DESC_INFO(rx, buf_index);
646
647                 skb = info->skb;
648
649                 prefetch_skb(skb);
650
651                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
652
653                 pci_unmap_single(pdev, dma, BUF_SIZE-LOCAL_SKB_ALIGN,
654                                  PCI_DMA_FROMDEVICE);
655
656                 if (macrx & XCT_MACRX_CRC) {
657                         /* CRC error flagged */
658                         mac->netdev->stats.rx_errors++;
659                         mac->netdev->stats.rx_crc_errors++;
660                         /* No need to free skb, it'll be reused */
661                         goto next;
662                 }
663
664                 info->skb = NULL;
665                 info->dma = 0;
666
667                 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
668                         skb->ip_summed = CHECKSUM_UNNECESSARY;
669                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
670                                            XCT_MACRX_CSUM_S;
671                 } else
672                         skb->ip_summed = CHECKSUM_NONE;
673
674                 packets++;
675                 tot_bytes += len;
676
677                 /* Don't include CRC */
678                 skb_put(skb, len-4);
679
680                 skb->protocol = eth_type_trans(skb, mac->netdev);
681                 lro_receive_skb(&mac->lro_mgr, skb, (void *)macrx);
682
683 next:
684                 RX_DESC(rx, n) = 0;
685                 RX_DESC(rx, n+1) = 0;
686
687                 /* Need to zero it out since hardware doesn't, since the
688                  * replenish loop uses it to tell when it's done.
689                  */
690                 RX_BUFF(rx, buf_index) = 0;
691
692                 n += 4;
693         }
694
695         if (n > RX_RING_SIZE) {
696                 /* Errata 5971 workaround: L2 target of headers */
697                 write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0);
698                 n &= (RX_RING_SIZE-1);
699         }
700
701         rx_ring(mac)->next_to_clean = n;
702
703         lro_flush_all(&mac->lro_mgr);
704
705         /* Increase is in number of 16-byte entries, and since each descriptor
706          * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
707          * count*2.
708          */
709         write_dma_reg(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1);
710
711         pasemi_mac_replenish_rx_ring(mac->netdev, count);
712
713         mac->netdev->stats.rx_bytes += tot_bytes;
714         mac->netdev->stats.rx_packets += packets;
715
716         spin_unlock(&rx_ring(mac)->lock);
717
718         return count;
719 }
720
721 /* Can't make this too large or we blow the kernel stack limits */
722 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
723
724 static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring)
725 {
726         struct pasemi_dmachan *chan = &txring->chan;
727         struct pasemi_mac *mac = txring->mac;
728         int i, j;
729         unsigned int start, descr_count, buf_count, batch_limit;
730         unsigned int ring_limit;
731         unsigned int total_count;
732         unsigned long flags;
733         struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
734         dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
735         int nf[TX_CLEAN_BATCHSIZE];
736         int nr_frags;
737
738         total_count = 0;
739         batch_limit = TX_CLEAN_BATCHSIZE;
740 restart:
741         spin_lock_irqsave(&txring->lock, flags);
742
743         start = txring->next_to_clean;
744         ring_limit = txring->next_to_fill;
745
746         prefetch(&TX_DESC_INFO(txring, start+1).skb);
747
748         /* Compensate for when fill has wrapped but clean has not */
749         if (start > ring_limit)
750                 ring_limit += TX_RING_SIZE;
751
752         buf_count = 0;
753         descr_count = 0;
754
755         for (i = start;
756              descr_count < batch_limit && i < ring_limit;
757              i += buf_count) {
758                 u64 mactx = TX_DESC(txring, i);
759                 struct sk_buff *skb;
760
761                 skb = TX_DESC_INFO(txring, i+1).skb;
762                 nr_frags = TX_DESC_INFO(txring, i).dma;
763
764                 if ((mactx  & XCT_MACTX_E) ||
765                     (*chan->status & PAS_STATUS_ERROR))
766                         pasemi_mac_tx_error(mac, mactx);
767
768                 if (unlikely(mactx & XCT_MACTX_O))
769                         /* Not yet transmitted */
770                         break;
771
772                 buf_count = 2 + nr_frags;
773                 /* Since we always fill with an even number of entries, make
774                  * sure we skip any unused one at the end as well.
775                  */
776                 if (buf_count & 1)
777                         buf_count++;
778
779                 for (j = 0; j <= nr_frags; j++)
780                         dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
781
782                 skbs[descr_count] = skb;
783                 nf[descr_count] = nr_frags;
784
785                 TX_DESC(txring, i) = 0;
786                 TX_DESC(txring, i+1) = 0;
787
788                 descr_count++;
789         }
790         txring->next_to_clean = i & (TX_RING_SIZE-1);
791
792         spin_unlock_irqrestore(&txring->lock, flags);
793         netif_wake_queue(mac->netdev);
794
795         for (i = 0; i < descr_count; i++)
796                 pasemi_mac_unmap_tx_skb(mac, nf[i], skbs[i], dmas[i]);
797
798         total_count += descr_count;
799
800         /* If the batch was full, try to clean more */
801         if (descr_count == batch_limit)
802                 goto restart;
803
804         return total_count;
805 }
806
807
808 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
809 {
810         const struct pasemi_mac_rxring *rxring = data;
811         struct pasemi_mac *mac = rxring->mac;
812         struct net_device *dev = mac->netdev;
813         const struct pasemi_dmachan *chan = &rxring->chan;
814         unsigned int reg;
815
816         if (!(*chan->status & PAS_STATUS_CAUSE_M))
817                 return IRQ_NONE;
818
819         /* Don't reset packet count so it won't fire again but clear
820          * all others.
821          */
822
823         reg = 0;
824         if (*chan->status & PAS_STATUS_SOFT)
825                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
826         if (*chan->status & PAS_STATUS_ERROR)
827                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
828
829         netif_rx_schedule(dev, &mac->napi);
830
831         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg);
832
833         return IRQ_HANDLED;
834 }
835
836 #define TX_CLEAN_INTERVAL HZ
837
838 static void pasemi_mac_tx_timer(unsigned long data)
839 {
840         struct pasemi_mac_txring *txring = (struct pasemi_mac_txring *)data;
841         struct pasemi_mac *mac = txring->mac;
842
843         pasemi_mac_clean_tx(txring);
844
845         mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL);
846
847         pasemi_mac_restart_tx_intr(mac);
848 }
849
850 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
851 {
852         struct pasemi_mac_txring *txring = data;
853         const struct pasemi_dmachan *chan = &txring->chan;
854         struct pasemi_mac *mac = txring->mac;
855         unsigned int reg;
856
857         if (!(*chan->status & PAS_STATUS_CAUSE_M))
858                 return IRQ_NONE;
859
860         reg = 0;
861
862         if (*chan->status & PAS_STATUS_SOFT)
863                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
864         if (*chan->status & PAS_STATUS_ERROR)
865                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
866
867         mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2);
868
869         netif_rx_schedule(mac->netdev, &mac->napi);
870
871         if (reg)
872                 write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), reg);
873
874         return IRQ_HANDLED;
875 }
876
877 static void pasemi_mac_intf_disable(struct pasemi_mac *mac)
878 {
879         unsigned int flags;
880
881         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
882         flags &= ~PAS_MAC_CFG_PCFG_PE;
883         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
884 }
885
886 static void pasemi_mac_intf_enable(struct pasemi_mac *mac)
887 {
888         unsigned int flags;
889
890         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
891         flags |= PAS_MAC_CFG_PCFG_PE;
892         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
893 }
894
895 static void pasemi_adjust_link(struct net_device *dev)
896 {
897         struct pasemi_mac *mac = netdev_priv(dev);
898         int msg;
899         unsigned int flags;
900         unsigned int new_flags;
901
902         if (!mac->phydev->link) {
903                 /* If no link, MAC speed settings don't matter. Just report
904                  * link down and return.
905                  */
906                 if (mac->link && netif_msg_link(mac))
907                         printk(KERN_INFO "%s: Link is down.\n", dev->name);
908
909                 netif_carrier_off(dev);
910                 pasemi_mac_intf_disable(mac);
911                 mac->link = 0;
912
913                 return;
914         } else {
915                 pasemi_mac_intf_enable(mac);
916                 netif_carrier_on(dev);
917         }
918
919         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
920         new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
921                               PAS_MAC_CFG_PCFG_TSR_M);
922
923         if (!mac->phydev->duplex)
924                 new_flags |= PAS_MAC_CFG_PCFG_HD;
925
926         switch (mac->phydev->speed) {
927         case 1000:
928                 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
929                              PAS_MAC_CFG_PCFG_TSR_1G;
930                 break;
931         case 100:
932                 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
933                              PAS_MAC_CFG_PCFG_TSR_100M;
934                 break;
935         case 10:
936                 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
937                              PAS_MAC_CFG_PCFG_TSR_10M;
938                 break;
939         default:
940                 printk("Unsupported speed %d\n", mac->phydev->speed);
941         }
942
943         /* Print on link or speed/duplex change */
944         msg = mac->link != mac->phydev->link || flags != new_flags;
945
946         mac->duplex = mac->phydev->duplex;
947         mac->speed = mac->phydev->speed;
948         mac->link = mac->phydev->link;
949
950         if (new_flags != flags)
951                 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
952
953         if (msg && netif_msg_link(mac))
954                 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
955                        dev->name, mac->speed, mac->duplex ? "full" : "half");
956 }
957
958 static int pasemi_mac_phy_init(struct net_device *dev)
959 {
960         struct pasemi_mac *mac = netdev_priv(dev);
961         struct device_node *dn, *phy_dn;
962         struct phy_device *phydev;
963         unsigned int phy_id;
964         const phandle *ph;
965         const unsigned int *prop;
966         struct resource r;
967         int ret;
968
969         dn = pci_device_to_OF_node(mac->pdev);
970         ph = of_get_property(dn, "phy-handle", NULL);
971         if (!ph)
972                 return -ENODEV;
973         phy_dn = of_find_node_by_phandle(*ph);
974
975         prop = of_get_property(phy_dn, "reg", NULL);
976         ret = of_address_to_resource(phy_dn->parent, 0, &r);
977         if (ret)
978                 goto err;
979
980         phy_id = *prop;
981         snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
982
983         of_node_put(phy_dn);
984
985         mac->link = 0;
986         mac->speed = 0;
987         mac->duplex = -1;
988
989         phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
990
991         if (IS_ERR(phydev)) {
992                 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
993                 return PTR_ERR(phydev);
994         }
995
996         mac->phydev = phydev;
997
998         return 0;
999
1000 err:
1001         of_node_put(phy_dn);
1002         return -ENODEV;
1003 }
1004
1005
1006 static int pasemi_mac_open(struct net_device *dev)
1007 {
1008         struct pasemi_mac *mac = netdev_priv(dev);
1009         unsigned int flags;
1010         int ret;
1011
1012         /* enable rx section */
1013         write_dma_reg(PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
1014
1015         /* enable tx section */
1016         write_dma_reg(PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
1017
1018         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
1019                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
1020                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
1021
1022         write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
1023
1024         ret = pasemi_mac_setup_rx_resources(dev);
1025         if (ret)
1026                 goto out_rx_resources;
1027
1028         mac->tx = pasemi_mac_setup_tx_resources(dev);
1029
1030         if (!mac->tx)
1031                 goto out_tx_ring;
1032
1033         /* 0x3ff with 33MHz clock is about 31us */
1034         write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG,
1035                       PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff));
1036
1037         write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno),
1038                       PAS_IOB_DMA_RXCH_CFG_CNTTH(256));
1039
1040         write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno),
1041                       PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
1042
1043         write_mac_reg(mac, PAS_MAC_IPC_CHNL,
1044                       PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) |
1045                       PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno));
1046
1047         /* enable rx if */
1048         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1049                       PAS_DMA_RXINT_RCMDSTA_EN |
1050                       PAS_DMA_RXINT_RCMDSTA_DROPS_M |
1051                       PAS_DMA_RXINT_RCMDSTA_BP |
1052                       PAS_DMA_RXINT_RCMDSTA_OO |
1053                       PAS_DMA_RXINT_RCMDSTA_BT);
1054
1055         /* enable rx channel */
1056         pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU |
1057                                                    PAS_DMA_RXCHAN_CCMDSTA_OD |
1058                                                    PAS_DMA_RXCHAN_CCMDSTA_FD |
1059                                                    PAS_DMA_RXCHAN_CCMDSTA_DT);
1060
1061         /* enable tx channel */
1062         pasemi_dma_start_chan(&tx_ring(mac)->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
1063                                                    PAS_DMA_TXCHAN_TCMDSTA_DB |
1064                                                    PAS_DMA_TXCHAN_TCMDSTA_DE |
1065                                                    PAS_DMA_TXCHAN_TCMDSTA_DA);
1066
1067         pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
1068
1069         write_dma_reg(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno),
1070                       RX_RING_SIZE>>1);
1071
1072         /* Clear out any residual packet count state from firmware */
1073         pasemi_mac_restart_rx_intr(mac);
1074         pasemi_mac_restart_tx_intr(mac);
1075
1076         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
1077
1078         if (mac->type == MAC_TYPE_GMAC)
1079                 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
1080         else
1081                 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
1082
1083         /* Enable interface in MAC */
1084         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1085
1086         ret = pasemi_mac_phy_init(dev);
1087         if (ret) {
1088                 /* Since we won't get link notification, just enable RX */
1089                 pasemi_mac_intf_enable(mac);
1090                 if (mac->type == MAC_TYPE_GMAC) {
1091                         /* Warn for missing PHY on SGMII (1Gig) ports */
1092                         dev_warn(&mac->pdev->dev,
1093                                  "PHY init failed: %d.\n", ret);
1094                         dev_warn(&mac->pdev->dev,
1095                                  "Defaulting to 1Gbit full duplex\n");
1096                 }
1097         }
1098
1099         netif_start_queue(dev);
1100         napi_enable(&mac->napi);
1101
1102         snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
1103                  dev->name);
1104
1105         ret = request_irq(mac->tx->chan.irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
1106                           mac->tx_irq_name, mac->tx);
1107         if (ret) {
1108                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1109                         mac->tx->chan.irq, ret);
1110                 goto out_tx_int;
1111         }
1112
1113         snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
1114                  dev->name);
1115
1116         ret = request_irq(mac->rx->chan.irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
1117                           mac->rx_irq_name, mac->rx);
1118         if (ret) {
1119                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1120                         mac->rx->chan.irq, ret);
1121                 goto out_rx_int;
1122         }
1123
1124         if (mac->phydev)
1125                 phy_start(mac->phydev);
1126
1127         init_timer(&mac->tx->clean_timer);
1128         mac->tx->clean_timer.function = pasemi_mac_tx_timer;
1129         mac->tx->clean_timer.data = (unsigned long)mac->tx;
1130         mac->tx->clean_timer.expires = jiffies+HZ;
1131         add_timer(&mac->tx->clean_timer);
1132
1133         return 0;
1134
1135 out_rx_int:
1136         free_irq(mac->tx->chan.irq, mac->tx);
1137 out_tx_int:
1138         napi_disable(&mac->napi);
1139         netif_stop_queue(dev);
1140 out_tx_ring:
1141         if (mac->tx)
1142                 pasemi_mac_free_tx_resources(mac);
1143         pasemi_mac_free_rx_resources(mac);
1144 out_rx_resources:
1145
1146         return ret;
1147 }
1148
1149 #define MAX_RETRIES 5000
1150
1151 static int pasemi_mac_close(struct net_device *dev)
1152 {
1153         struct pasemi_mac *mac = netdev_priv(dev);
1154         unsigned int sta;
1155         int retries;
1156         int rxch, txch;
1157
1158         rxch = rx_ring(mac)->chan.chno;
1159         txch = tx_ring(mac)->chan.chno;
1160
1161         if (mac->phydev) {
1162                 phy_stop(mac->phydev);
1163                 phy_disconnect(mac->phydev);
1164         }
1165
1166         del_timer_sync(&mac->tx->clean_timer);
1167
1168         netif_stop_queue(dev);
1169         napi_disable(&mac->napi);
1170
1171         sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1172         if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
1173                       PAS_DMA_RXINT_RCMDSTA_OO |
1174                       PAS_DMA_RXINT_RCMDSTA_BT))
1175                 printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);
1176
1177         sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1178         if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
1179                      PAS_DMA_RXCHAN_CCMDSTA_OD |
1180                      PAS_DMA_RXCHAN_CCMDSTA_FD |
1181                      PAS_DMA_RXCHAN_CCMDSTA_DT))
1182                 printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);
1183
1184         sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1185         if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB |
1186                       PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA))
1187                 printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);
1188
1189         /* Clean out any pending buffers */
1190         pasemi_mac_clean_tx(tx_ring(mac));
1191         pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1192
1193         /* Disable interface */
1194         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch),
1195                       PAS_DMA_TXCHAN_TCMDSTA_ST);
1196         write_dma_reg( PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1197                       PAS_DMA_RXINT_RCMDSTA_ST);
1198         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch),
1199                       PAS_DMA_RXCHAN_CCMDSTA_ST);
1200
1201         for (retries = 0; retries < MAX_RETRIES; retries++) {
1202                 sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(rxch));
1203                 if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1204                         break;
1205                 cond_resched();
1206         }
1207
1208         if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1209                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
1210
1211         for (retries = 0; retries < MAX_RETRIES; retries++) {
1212                 sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1213                 if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1214                         break;
1215                 cond_resched();
1216         }
1217
1218         if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1219                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
1220
1221         for (retries = 0; retries < MAX_RETRIES; retries++) {
1222                 sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1223                 if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
1224                         break;
1225                 cond_resched();
1226         }
1227
1228         if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
1229                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
1230
1231         /* Then, disable the channel. This must be done separately from
1232          * stopping, since you can't disable when active.
1233          */
1234
1235         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0);
1236         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0);
1237         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1238
1239         free_irq(mac->tx->chan.irq, mac->tx);
1240         free_irq(mac->rx->chan.irq, mac->rx);
1241
1242         /* Free resources */
1243         pasemi_mac_free_rx_resources(mac);
1244         pasemi_mac_free_tx_resources(mac);
1245
1246         return 0;
1247 }
1248
1249 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1250 {
1251         struct pasemi_mac *mac = netdev_priv(dev);
1252         struct pasemi_mac_txring *txring;
1253         u64 dflags, mactx;
1254         dma_addr_t map[MAX_SKB_FRAGS+1];
1255         unsigned int map_size[MAX_SKB_FRAGS+1];
1256         unsigned long flags;
1257         int i, nfrags;
1258         int fill;
1259
1260         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
1261
1262         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1263                 const unsigned char *nh = skb_network_header(skb);
1264
1265                 switch (ip_hdr(skb)->protocol) {
1266                 case IPPROTO_TCP:
1267                         dflags |= XCT_MACTX_CSUM_TCP;
1268                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1269                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1270                         break;
1271                 case IPPROTO_UDP:
1272                         dflags |= XCT_MACTX_CSUM_UDP;
1273                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1274                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1275                         break;
1276                 }
1277         }
1278
1279         nfrags = skb_shinfo(skb)->nr_frags;
1280
1281         map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
1282                                 PCI_DMA_TODEVICE);
1283         map_size[0] = skb_headlen(skb);
1284         if (dma_mapping_error(map[0]))
1285                 goto out_err_nolock;
1286
1287         for (i = 0; i < nfrags; i++) {
1288                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1289
1290                 map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
1291                                         frag->page_offset, frag->size,
1292                                         PCI_DMA_TODEVICE);
1293                 map_size[i+1] = frag->size;
1294                 if (dma_mapping_error(map[i+1])) {
1295                         nfrags = i;
1296                         goto out_err_nolock;
1297                 }
1298         }
1299
1300         mactx = dflags | XCT_MACTX_LLEN(skb->len);
1301
1302         txring = tx_ring(mac);
1303
1304         spin_lock_irqsave(&txring->lock, flags);
1305
1306         fill = txring->next_to_fill;
1307
1308         /* Avoid stepping on the same cache line that the DMA controller
1309          * is currently about to send, so leave at least 8 words available.
1310          * Total free space needed is mactx + fragments + 8
1311          */
1312         if (RING_AVAIL(txring) < nfrags + 10) {
1313                 /* no room -- stop the queue and wait for tx intr */
1314                 netif_stop_queue(dev);
1315                 goto out_err;
1316         }
1317
1318         TX_DESC(txring, fill) = mactx;
1319         TX_DESC_INFO(txring, fill).dma = nfrags;
1320         fill++;
1321         TX_DESC_INFO(txring, fill).skb = skb;
1322         for (i = 0; i <= nfrags; i++) {
1323                 TX_DESC(txring, fill+i) =
1324                         XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1325                 TX_DESC_INFO(txring, fill+i).dma = map[i];
1326         }
1327
1328         /* We have to add an even number of 8-byte entries to the ring
1329          * even if the last one is unused. That means always an odd number
1330          * of pointers + one mactx descriptor.
1331          */
1332         if (nfrags & 1)
1333                 nfrags++;
1334
1335         txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1);
1336
1337         dev->stats.tx_packets++;
1338         dev->stats.tx_bytes += skb->len;
1339
1340         spin_unlock_irqrestore(&txring->lock, flags);
1341
1342         write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (nfrags+2) >> 1);
1343
1344         return NETDEV_TX_OK;
1345
1346 out_err:
1347         spin_unlock_irqrestore(&txring->lock, flags);
1348 out_err_nolock:
1349         while (nfrags--)
1350                 pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
1351                                  PCI_DMA_TODEVICE);
1352
1353         return NETDEV_TX_BUSY;
1354 }
1355
1356 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1357 {
1358         const struct pasemi_mac *mac = netdev_priv(dev);
1359         unsigned int flags;
1360
1361         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1362
1363         /* Set promiscuous */
1364         if (dev->flags & IFF_PROMISC)
1365                 flags |= PAS_MAC_CFG_PCFG_PR;
1366         else
1367                 flags &= ~PAS_MAC_CFG_PCFG_PR;
1368
1369         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1370 }
1371
1372
1373 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1374 {
1375         struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1376         struct net_device *dev = mac->netdev;
1377         int pkts;
1378
1379         pasemi_mac_clean_tx(tx_ring(mac));
1380         pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
1381         if (pkts < budget) {
1382                 /* all done, no more packets present */
1383                 netif_rx_complete(dev, napi);
1384
1385                 pasemi_mac_restart_rx_intr(mac);
1386                 pasemi_mac_restart_tx_intr(mac);
1387         }
1388         return pkts;
1389 }
1390
1391 static int __devinit
1392 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1393 {
1394         struct net_device *dev;
1395         struct pasemi_mac *mac;
1396         int err;
1397         DECLARE_MAC_BUF(mac_buf);
1398
1399         err = pci_enable_device(pdev);
1400         if (err)
1401                 return err;
1402
1403         dev = alloc_etherdev(sizeof(struct pasemi_mac));
1404         if (dev == NULL) {
1405                 dev_err(&pdev->dev,
1406                         "pasemi_mac: Could not allocate ethernet device.\n");
1407                 err = -ENOMEM;
1408                 goto out_disable_device;
1409         }
1410
1411         pci_set_drvdata(pdev, dev);
1412         SET_NETDEV_DEV(dev, &pdev->dev);
1413
1414         mac = netdev_priv(dev);
1415
1416         mac->pdev = pdev;
1417         mac->netdev = dev;
1418
1419         netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
1420
1421         dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG |
1422                         NETIF_F_HIGHDMA;
1423
1424         mac->lro_mgr.max_aggr = LRO_MAX_AGGR;
1425         mac->lro_mgr.max_desc = MAX_LRO_DESCRIPTORS;
1426         mac->lro_mgr.lro_arr = mac->lro_desc;
1427         mac->lro_mgr.get_skb_header = get_skb_hdr;
1428         mac->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
1429         mac->lro_mgr.dev = mac->netdev;
1430         mac->lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
1431         mac->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1432
1433
1434         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1435         if (!mac->dma_pdev) {
1436                 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1437                 err = -ENODEV;
1438                 goto out;
1439         }
1440
1441         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1442         if (!mac->iob_pdev) {
1443                 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1444                 err = -ENODEV;
1445                 goto out;
1446         }
1447
1448         /* get mac addr from device tree */
1449         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1450                 err = -ENODEV;
1451                 goto out;
1452         }
1453         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1454
1455         mac->dma_if = mac_to_intf(mac);
1456         if (mac->dma_if < 0) {
1457                 dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
1458                 err = -ENODEV;
1459                 goto out;
1460         }
1461
1462         switch (pdev->device) {
1463         case 0xa005:
1464                 mac->type = MAC_TYPE_GMAC;
1465                 break;
1466         case 0xa006:
1467                 mac->type = MAC_TYPE_XAUI;
1468                 break;
1469         default:
1470                 err = -ENODEV;
1471                 goto out;
1472         }
1473
1474         dev->open = pasemi_mac_open;
1475         dev->stop = pasemi_mac_close;
1476         dev->hard_start_xmit = pasemi_mac_start_tx;
1477         dev->set_multicast_list = pasemi_mac_set_rx_mode;
1478
1479         if (err)
1480                 goto out;
1481
1482         mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1483
1484         /* Enable most messages by default */
1485         mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1486
1487         err = register_netdev(dev);
1488
1489         if (err) {
1490                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1491                         err);
1492                 goto out;
1493         } else if netif_msg_probe(mac)
1494                 printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %s\n",
1495                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1496                        mac->dma_if, print_mac(mac_buf, dev->dev_addr));
1497
1498         return err;
1499
1500 out:
1501         if (mac->iob_pdev)
1502                 pci_dev_put(mac->iob_pdev);
1503         if (mac->dma_pdev)
1504                 pci_dev_put(mac->dma_pdev);
1505
1506         free_netdev(dev);
1507 out_disable_device:
1508         pci_disable_device(pdev);
1509         return err;
1510
1511 }
1512
1513 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1514 {
1515         struct net_device *netdev = pci_get_drvdata(pdev);
1516         struct pasemi_mac *mac;
1517
1518         if (!netdev)
1519                 return;
1520
1521         mac = netdev_priv(netdev);
1522
1523         unregister_netdev(netdev);
1524
1525         pci_disable_device(pdev);
1526         pci_dev_put(mac->dma_pdev);
1527         pci_dev_put(mac->iob_pdev);
1528
1529         pasemi_dma_free_chan(&mac->tx->chan);
1530         pasemi_dma_free_chan(&mac->rx->chan);
1531
1532         pci_set_drvdata(pdev, NULL);
1533         free_netdev(netdev);
1534 }
1535
1536 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1537         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1538         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1539         { },
1540 };
1541
1542 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1543
1544 static struct pci_driver pasemi_mac_driver = {
1545         .name           = "pasemi_mac",
1546         .id_table       = pasemi_mac_pci_tbl,
1547         .probe          = pasemi_mac_probe,
1548         .remove         = __devexit_p(pasemi_mac_remove),
1549 };
1550
1551 static void __exit pasemi_mac_cleanup_module(void)
1552 {
1553         pci_unregister_driver(&pasemi_mac_driver);
1554 }
1555
1556 int pasemi_mac_init_module(void)
1557 {
1558         int err;
1559
1560         err = pasemi_dma_init();
1561         if (err)
1562                 return err;
1563
1564         return pci_register_driver(&pasemi_mac_driver);
1565 }
1566
1567 module_init(pasemi_mac_init_module);
1568 module_exit(pasemi_mac_cleanup_module);