2 * Copyright (C) 2006-2007 PA Semi, Inc
4 * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
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.
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.
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
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>
30 #include <linux/skbuff.h>
33 #include <linux/tcp.h>
34 #include <net/checksum.h>
38 #include "pasemi_mac.h"
40 /* We have our own align, since ppc64 in general has it at 0 because
41 * of design flaws in some of the server bridge chips. However, for
42 * PWRficient doing the unaligned copies is more expensive than doing
43 * unaligned DMA, so make sure the data is aligned instead.
45 #define LOCAL_SKB_ALIGN 2
56 /* Must be a power of two */
57 #define RX_RING_SIZE 4096
58 #define TX_RING_SIZE 4096
60 #define DEFAULT_MSG_ENABLE \
70 #define TX_RING(mac, num) ((mac)->tx->ring[(num) & (TX_RING_SIZE-1)])
71 #define TX_RING_INFO(mac, num) ((mac)->tx->ring_info[(num) & (TX_RING_SIZE-1)])
72 #define RX_RING(mac, num) ((mac)->rx->ring[(num) & (RX_RING_SIZE-1)])
73 #define RX_RING_INFO(mac, num) ((mac)->rx->ring_info[(num) & (RX_RING_SIZE-1)])
74 #define RX_BUFF(mac, num) ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
76 #define RING_USED(ring) (((ring)->next_to_fill - (ring)->next_to_clean) \
78 #define RING_AVAIL(ring) ((ring->size) - RING_USED(ring))
80 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
82 MODULE_LICENSE("GPL");
83 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
84 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
86 static int debug = -1; /* -1 == use DEFAULT_MSG_ENABLE as value */
87 module_param(debug, int, 0);
88 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
90 static struct pasdma_status *dma_status;
92 static void write_iob_reg(struct pasemi_mac *mac, unsigned int reg,
95 out_le32(mac->iob_regs+reg, val);
98 static unsigned int read_mac_reg(struct pasemi_mac *mac, unsigned int reg)
100 return in_le32(mac->regs+reg);
103 static void write_mac_reg(struct pasemi_mac *mac, unsigned int reg,
106 out_le32(mac->regs+reg, val);
109 static unsigned int read_dma_reg(struct pasemi_mac *mac, unsigned int reg)
111 return in_le32(mac->dma_regs+reg);
114 static void write_dma_reg(struct pasemi_mac *mac, unsigned int reg,
117 out_le32(mac->dma_regs+reg, val);
120 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
122 struct pci_dev *pdev = mac->pdev;
123 struct device_node *dn = pci_device_to_OF_node(pdev);
130 "No device node for mac, not configuring\n");
134 maddr = of_get_property(dn, "local-mac-address", &len);
136 if (maddr && len == 6) {
137 memcpy(mac->mac_addr, maddr, 6);
141 /* Some old versions of firmware mistakenly uses mac-address
142 * (and as a string) instead of a byte array in local-mac-address.
146 maddr = of_get_property(dn, "mac-address", NULL);
150 "no mac address in device tree, not configuring\n");
155 if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
156 &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
158 "can't parse mac address, not configuring\n");
162 memcpy(mac->mac_addr, addr, 6);
167 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
172 int nfrags = skb_shinfo(skb)->nr_frags;
174 pci_unmap_single(mac->dma_pdev, dmas[0], skb_headlen(skb),
177 for (f = 0; f < nfrags; f++) {
178 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
180 pci_unmap_page(mac->dma_pdev, dmas[f+1], frag->size,
183 dev_kfree_skb_irq(skb);
185 /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
186 * aligned up to a power of 2
188 return (nfrags + 3) & ~1;
191 static int pasemi_mac_setup_rx_resources(struct net_device *dev)
193 struct pasemi_mac_rxring *ring;
194 struct pasemi_mac *mac = netdev_priv(dev);
195 int chan_id = mac->dma_rxch;
197 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
202 spin_lock_init(&ring->lock);
204 ring->size = RX_RING_SIZE;
205 ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
206 RX_RING_SIZE, GFP_KERNEL);
208 if (!ring->ring_info)
211 /* Allocate descriptors */
212 ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
213 RX_RING_SIZE * sizeof(u64),
214 &ring->dma, GFP_KERNEL);
219 memset(ring->ring, 0, RX_RING_SIZE * sizeof(u64));
221 ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
222 RX_RING_SIZE * sizeof(u64),
223 &ring->buf_dma, GFP_KERNEL);
227 memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
229 write_dma_reg(mac, PAS_DMA_RXCHAN_BASEL(chan_id), PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
231 write_dma_reg(mac, PAS_DMA_RXCHAN_BASEU(chan_id),
232 PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
233 PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
235 write_dma_reg(mac, PAS_DMA_RXCHAN_CFG(chan_id),
236 PAS_DMA_RXCHAN_CFG_HBU(2));
238 write_dma_reg(mac, PAS_DMA_RXINT_BASEL(mac->dma_if),
239 PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
241 write_dma_reg(mac, PAS_DMA_RXINT_BASEU(mac->dma_if),
242 PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
243 PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
245 write_dma_reg(mac, PAS_DMA_RXINT_CFG(mac->dma_if),
246 PAS_DMA_RXINT_CFG_DHL(3) |
247 PAS_DMA_RXINT_CFG_L2 |
248 PAS_DMA_RXINT_CFG_LW);
250 ring->next_to_fill = 0;
251 ring->next_to_clean = 0;
253 snprintf(ring->irq_name, sizeof(ring->irq_name),
260 dma_free_coherent(&mac->dma_pdev->dev,
261 RX_RING_SIZE * sizeof(u64),
262 mac->rx->ring, mac->rx->dma);
264 kfree(ring->ring_info);
272 static int pasemi_mac_setup_tx_resources(struct net_device *dev)
274 struct pasemi_mac *mac = netdev_priv(dev);
276 int chan_id = mac->dma_txch;
277 struct pasemi_mac_txring *ring;
279 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
283 spin_lock_init(&ring->lock);
285 ring->size = TX_RING_SIZE;
286 ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
287 TX_RING_SIZE, GFP_KERNEL);
288 if (!ring->ring_info)
291 /* Allocate descriptors */
292 ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
293 TX_RING_SIZE * sizeof(u64),
294 &ring->dma, GFP_KERNEL);
298 memset(ring->ring, 0, TX_RING_SIZE * sizeof(u64));
300 write_dma_reg(mac, PAS_DMA_TXCHAN_BASEL(chan_id),
301 PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
302 val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
303 val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
305 write_dma_reg(mac, PAS_DMA_TXCHAN_BASEU(chan_id), val);
307 write_dma_reg(mac, PAS_DMA_TXCHAN_CFG(chan_id),
308 PAS_DMA_TXCHAN_CFG_TY_IFACE |
309 PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
310 PAS_DMA_TXCHAN_CFG_UP |
311 PAS_DMA_TXCHAN_CFG_WT(2));
313 ring->next_to_fill = 0;
314 ring->next_to_clean = 0;
316 snprintf(ring->irq_name, sizeof(ring->irq_name),
323 kfree(ring->ring_info);
330 static void pasemi_mac_free_tx_resources(struct net_device *dev)
332 struct pasemi_mac *mac = netdev_priv(dev);
334 struct pasemi_mac_buffer *info;
335 dma_addr_t dmas[MAX_SKB_FRAGS+1];
339 start = mac->tx->next_to_clean;
340 limit = mac->tx->next_to_fill;
342 /* Compensate for when fill has wrapped and clean has not */
344 limit += TX_RING_SIZE;
346 for (i = start; i < limit; i += freed) {
347 info = &TX_RING_INFO(mac, i+1);
348 if (info->dma && info->skb) {
349 for (j = 0; j <= skb_shinfo(info->skb)->nr_frags; j++)
350 dmas[j] = TX_RING_INFO(mac, i+1+j).dma;
351 freed = pasemi_mac_unmap_tx_skb(mac, info->skb, dmas);
356 for (i = 0; i < TX_RING_SIZE; i++)
359 dma_free_coherent(&mac->dma_pdev->dev,
360 TX_RING_SIZE * sizeof(u64),
361 mac->tx->ring, mac->tx->dma);
363 kfree(mac->tx->ring_info);
368 static void pasemi_mac_free_rx_resources(struct net_device *dev)
370 struct pasemi_mac *mac = netdev_priv(dev);
372 struct pasemi_mac_buffer *info;
374 for (i = 0; i < RX_RING_SIZE; i++) {
375 info = &RX_RING_INFO(mac, i);
376 if (info->skb && info->dma) {
377 pci_unmap_single(mac->dma_pdev,
381 dev_kfree_skb_any(info->skb);
387 for (i = 0; i < RX_RING_SIZE; i++)
390 dma_free_coherent(&mac->dma_pdev->dev,
391 RX_RING_SIZE * sizeof(u64),
392 mac->rx->ring, mac->rx->dma);
394 dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
395 mac->rx->buffers, mac->rx->buf_dma);
397 kfree(mac->rx->ring_info);
402 static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
404 struct pasemi_mac *mac = netdev_priv(dev);
405 int start = mac->rx->next_to_fill;
406 unsigned int fill, count;
412 for (count = 0; count < limit; count++) {
413 struct pasemi_mac_buffer *info = &RX_RING_INFO(mac, fill);
414 u64 *buff = &RX_BUFF(mac, fill);
421 /* skb might still be in there for recycle on short receives */
425 skb = dev_alloc_skb(BUF_SIZE);
426 skb_reserve(skb, LOCAL_SKB_ALIGN);
432 dma = pci_map_single(mac->dma_pdev, skb->data,
433 BUF_SIZE - LOCAL_SKB_ALIGN,
436 if (unlikely(dma_mapping_error(dma))) {
437 dev_kfree_skb_irq(info->skb);
443 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
449 write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), count);
450 write_dma_reg(mac, PAS_DMA_RXINT_INCR(mac->dma_if), count);
452 mac->rx->next_to_fill += count;
455 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
457 unsigned int reg, pcnt;
458 /* Re-enable packet count interrupts: finally
459 * ack the packet count interrupt we got in rx_intr.
462 pcnt = *mac->rx_status & PAS_STATUS_PCNT_M;
464 reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
466 write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
469 static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
471 unsigned int reg, pcnt;
473 /* Re-enable packet count interrupts */
474 pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;
476 reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
478 write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
482 static inline void pasemi_mac_rx_error(struct pasemi_mac *mac, u64 macrx)
484 unsigned int rcmdsta, ccmdsta;
486 if (!netif_msg_rx_err(mac))
489 rcmdsta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
490 ccmdsta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
492 printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
493 macrx, *mac->rx_status);
495 printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
499 static inline void pasemi_mac_tx_error(struct pasemi_mac *mac, u64 mactx)
503 if (!netif_msg_tx_err(mac))
506 cmdsta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
508 printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
509 "tx status 0x%016lx\n", mactx, *mac->tx_status);
511 printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
514 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
518 struct pasemi_mac_buffer *info;
524 spin_lock(&mac->rx->lock);
526 n = mac->rx->next_to_clean;
528 for (count = limit; count; count--) {
529 macrx = RX_RING(mac, n);
531 if ((macrx & XCT_MACRX_E) ||
532 (*mac->rx_status & PAS_STATUS_ERROR))
533 pasemi_mac_rx_error(mac, macrx);
535 if (!(macrx & XCT_MACRX_O))
540 /* We have to scan for our skb since there's no way
541 * to back-map them from the descriptor, and if we
542 * have several receive channels then they might not
543 * show up in the same order as they were put on the
547 dma = (RX_RING(mac, n+1) & XCT_PTR_ADDR_M);
548 for (i = mac->rx->next_to_fill;
549 i < (mac->rx->next_to_fill + RX_RING_SIZE);
551 info = &RX_RING_INFO(mac, i);
552 if (info->dma == dma)
559 prefetch(&skb->data_len);
561 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
564 struct sk_buff *new_skb;
566 new_skb = netdev_alloc_skb(mac->netdev,
567 len + LOCAL_SKB_ALIGN);
569 skb_reserve(new_skb, LOCAL_SKB_ALIGN);
570 memcpy(new_skb->data, skb->data, len);
571 /* save the skb in buffer_info as good */
574 /* else just continue with the old one */
578 pci_unmap_single(mac->dma_pdev, dma, len, PCI_DMA_FROMDEVICE);
584 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
585 skb->ip_summed = CHECKSUM_UNNECESSARY;
586 skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
589 skb->ip_summed = CHECKSUM_NONE;
591 mac->netdev->stats.rx_bytes += len;
592 mac->netdev->stats.rx_packets++;
594 skb->protocol = eth_type_trans(skb, mac->netdev);
595 netif_receive_skb(skb);
598 RX_RING(mac, n+1) = 0;
600 /* Need to zero it out since hardware doesn't, since the
601 * replenish loop uses it to tell when it's done.
608 if (n > RX_RING_SIZE) {
609 /* Errata 5971 workaround: L2 target of headers */
610 write_iob_reg(mac, PAS_IOB_COM_PKTHDRCNT, 0);
611 n &= (RX_RING_SIZE-1);
613 mac->rx->next_to_clean = n;
614 pasemi_mac_replenish_rx_ring(mac->netdev, limit-count);
616 spin_unlock(&mac->rx->lock);
621 /* Can't make this too large or we blow the kernel stack limits */
622 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
624 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
627 unsigned int start, descr_count, buf_count, batch_limit;
628 unsigned int ring_limit;
629 unsigned int total_count;
631 struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
632 dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
635 batch_limit = TX_CLEAN_BATCHSIZE;
637 spin_lock_irqsave(&mac->tx->lock, flags);
639 start = mac->tx->next_to_clean;
640 ring_limit = mac->tx->next_to_fill;
642 /* Compensate for when fill has wrapped but clean has not */
643 if (start > ring_limit)
644 ring_limit += TX_RING_SIZE;
650 descr_count < batch_limit && i < ring_limit;
652 u64 mactx = TX_RING(mac, i);
655 if ((mactx & XCT_MACTX_E) ||
656 (*mac->tx_status & PAS_STATUS_ERROR))
657 pasemi_mac_tx_error(mac, mactx);
659 if (unlikely(mactx & XCT_MACTX_O))
660 /* Not yet transmitted */
663 skb = TX_RING_INFO(mac, i+1).skb;
664 skbs[descr_count] = skb;
666 buf_count = 2 + skb_shinfo(skb)->nr_frags;
667 for (j = 0; j <= skb_shinfo(skb)->nr_frags; j++)
668 dmas[descr_count][j] = TX_RING_INFO(mac, i+1+j).dma;
671 TX_RING(mac, i+1) = 0;
673 /* Since we always fill with an even number of entries, make
674 * sure we skip any unused one at the end as well.
680 mac->tx->next_to_clean = i & (TX_RING_SIZE-1);
682 spin_unlock_irqrestore(&mac->tx->lock, flags);
683 netif_wake_queue(mac->netdev);
685 for (i = 0; i < descr_count; i++)
686 pasemi_mac_unmap_tx_skb(mac, skbs[i], dmas[i]);
688 total_count += descr_count;
690 /* If the batch was full, try to clean more */
691 if (descr_count == batch_limit)
698 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
700 struct net_device *dev = data;
701 struct pasemi_mac *mac = netdev_priv(dev);
704 if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
707 /* Don't reset packet count so it won't fire again but clear
712 if (*mac->rx_status & PAS_STATUS_SOFT)
713 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
714 if (*mac->rx_status & PAS_STATUS_ERROR)
715 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
716 if (*mac->rx_status & PAS_STATUS_TIMER)
717 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
719 netif_rx_schedule(dev, &mac->napi);
721 write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
726 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
728 struct net_device *dev = data;
729 struct pasemi_mac *mac = netdev_priv(dev);
730 unsigned int reg, pcnt;
732 if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
735 pasemi_mac_clean_tx(mac);
737 pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;
739 reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
741 if (*mac->tx_status & PAS_STATUS_SOFT)
742 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
743 if (*mac->tx_status & PAS_STATUS_ERROR)
744 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
746 write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
751 static void pasemi_adjust_link(struct net_device *dev)
753 struct pasemi_mac *mac = netdev_priv(dev);
756 unsigned int new_flags;
758 if (!mac->phydev->link) {
759 /* If no link, MAC speed settings don't matter. Just report
760 * link down and return.
762 if (mac->link && netif_msg_link(mac))
763 printk(KERN_INFO "%s: Link is down.\n", dev->name);
765 netif_carrier_off(dev);
770 netif_carrier_on(dev);
772 flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
773 new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
774 PAS_MAC_CFG_PCFG_TSR_M);
776 if (!mac->phydev->duplex)
777 new_flags |= PAS_MAC_CFG_PCFG_HD;
779 switch (mac->phydev->speed) {
781 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
782 PAS_MAC_CFG_PCFG_TSR_1G;
785 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
786 PAS_MAC_CFG_PCFG_TSR_100M;
789 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
790 PAS_MAC_CFG_PCFG_TSR_10M;
793 printk("Unsupported speed %d\n", mac->phydev->speed);
796 /* Print on link or speed/duplex change */
797 msg = mac->link != mac->phydev->link || flags != new_flags;
799 mac->duplex = mac->phydev->duplex;
800 mac->speed = mac->phydev->speed;
801 mac->link = mac->phydev->link;
803 if (new_flags != flags)
804 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
806 if (msg && netif_msg_link(mac))
807 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
808 dev->name, mac->speed, mac->duplex ? "full" : "half");
811 static int pasemi_mac_phy_init(struct net_device *dev)
813 struct pasemi_mac *mac = netdev_priv(dev);
814 struct device_node *dn, *phy_dn;
815 struct phy_device *phydev;
818 const unsigned int *prop;
822 dn = pci_device_to_OF_node(mac->pdev);
823 ph = of_get_property(dn, "phy-handle", NULL);
826 phy_dn = of_find_node_by_phandle(*ph);
828 prop = of_get_property(phy_dn, "reg", NULL);
829 ret = of_address_to_resource(phy_dn->parent, 0, &r);
834 snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
842 phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
844 if (IS_ERR(phydev)) {
845 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
846 return PTR_ERR(phydev);
849 mac->phydev = phydev;
859 static int pasemi_mac_open(struct net_device *dev)
861 struct pasemi_mac *mac = netdev_priv(dev);
866 /* enable rx section */
867 write_dma_reg(mac, PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
869 /* enable tx section */
870 write_dma_reg(mac, PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
872 flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
873 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
874 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
876 write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
878 write_iob_reg(mac, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
879 PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
881 write_iob_reg(mac, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
882 PAS_IOB_DMA_TXCH_CFG_CNTTH(128));
884 /* Clear out any residual packet count state from firmware */
885 pasemi_mac_restart_rx_intr(mac);
886 pasemi_mac_restart_tx_intr(mac);
888 /* 0xffffff is max value, about 16ms */
889 write_iob_reg(mac, PAS_IOB_DMA_COM_TIMEOUTCFG,
890 PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
892 ret = pasemi_mac_setup_rx_resources(dev);
894 goto out_rx_resources;
896 ret = pasemi_mac_setup_tx_resources(dev);
898 goto out_tx_resources;
900 write_mac_reg(mac, PAS_MAC_IPC_CHNL,
901 PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
902 PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
905 write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
906 PAS_DMA_RXINT_RCMDSTA_EN);
908 /* enable rx channel */
909 write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
910 PAS_DMA_RXCHAN_CCMDSTA_EN |
911 PAS_DMA_RXCHAN_CCMDSTA_DU);
913 /* enable tx channel */
914 write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
915 PAS_DMA_TXCHAN_TCMDSTA_EN);
917 pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
919 flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
920 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
922 if (mac->type == MAC_TYPE_GMAC)
923 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
925 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
927 /* Enable interface in MAC */
928 write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
930 ret = pasemi_mac_phy_init(dev);
931 /* Some configs don't have PHYs (XAUI etc), so don't complain about
932 * failed init due to -ENODEV.
934 if (ret && ret != -ENODEV)
935 dev_warn(&mac->pdev->dev, "phy init failed: %d\n", ret);
937 netif_start_queue(dev);
938 napi_enable(&mac->napi);
940 /* Interrupts are a bit different for our DMA controller: While
941 * it's got one a regular PCI device header, the interrupt there
942 * is really the base of the range it's using. Each tx and rx
943 * channel has it's own interrupt source.
946 base_irq = virq_to_hw(mac->dma_pdev->irq);
948 mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
949 mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
951 ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
952 mac->tx->irq_name, dev);
954 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
955 base_irq + mac->dma_txch, ret);
959 ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
960 mac->rx->irq_name, dev);
962 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
963 base_irq + 20 + mac->dma_rxch, ret);
968 phy_start(mac->phydev);
973 free_irq(mac->tx_irq, dev);
975 napi_disable(&mac->napi);
976 netif_stop_queue(dev);
977 pasemi_mac_free_tx_resources(dev);
979 pasemi_mac_free_rx_resources(dev);
985 #define MAX_RETRIES 5000
987 static int pasemi_mac_close(struct net_device *dev)
989 struct pasemi_mac *mac = netdev_priv(dev);
994 phy_stop(mac->phydev);
995 phy_disconnect(mac->phydev);
998 netif_stop_queue(dev);
999 napi_disable(&mac->napi);
1001 /* Clean out any pending buffers */
1002 pasemi_mac_clean_tx(mac);
1003 pasemi_mac_clean_rx(mac, RX_RING_SIZE);
1005 /* Disable interface */
1006 write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), PAS_DMA_TXCHAN_TCMDSTA_ST);
1007 write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), PAS_DMA_RXINT_RCMDSTA_ST);
1008 write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), PAS_DMA_RXCHAN_CCMDSTA_ST);
1010 for (retries = 0; retries < MAX_RETRIES; retries++) {
1011 stat = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
1012 if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1017 if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1018 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
1020 for (retries = 0; retries < MAX_RETRIES; retries++) {
1021 stat = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
1022 if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1027 if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1028 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
1030 for (retries = 0; retries < MAX_RETRIES; retries++) {
1031 stat = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1032 if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
1037 if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
1038 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
1040 /* Then, disable the channel. This must be done separately from
1041 * stopping, since you can't disable when active.
1044 write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
1045 write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
1046 write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1048 free_irq(mac->tx_irq, dev);
1049 free_irq(mac->rx_irq, dev);
1051 /* Free resources */
1052 pasemi_mac_free_rx_resources(dev);
1053 pasemi_mac_free_tx_resources(dev);
1058 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1060 struct pasemi_mac *mac = netdev_priv(dev);
1061 struct pasemi_mac_txring *txring;
1063 dma_addr_t map[MAX_SKB_FRAGS+1];
1064 unsigned int map_size[MAX_SKB_FRAGS+1];
1065 unsigned long flags;
1068 dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
1070 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1071 const unsigned char *nh = skb_network_header(skb);
1073 switch (ip_hdr(skb)->protocol) {
1075 dflags |= XCT_MACTX_CSUM_TCP;
1076 dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1077 dflags |= XCT_MACTX_IPO(nh - skb->data);
1080 dflags |= XCT_MACTX_CSUM_UDP;
1081 dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1082 dflags |= XCT_MACTX_IPO(nh - skb->data);
1087 nfrags = skb_shinfo(skb)->nr_frags;
1089 map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
1091 map_size[0] = skb_headlen(skb);
1092 if (dma_mapping_error(map[0]))
1093 goto out_err_nolock;
1095 for (i = 0; i < nfrags; i++) {
1096 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1098 map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
1099 frag->page_offset, frag->size,
1101 map_size[i+1] = frag->size;
1102 if (dma_mapping_error(map[i+1])) {
1104 goto out_err_nolock;
1108 mactx = dflags | XCT_MACTX_LLEN(skb->len);
1112 spin_lock_irqsave(&txring->lock, flags);
1114 /* Avoid stepping on the same cache line that the DMA controller
1115 * is currently about to send, so leave at least 8 words available.
1116 * Total free space needed is mactx + fragments + 8
1118 if (RING_AVAIL(txring) < nfrags + 10) {
1119 /* no room -- stop the queue and wait for tx intr */
1120 netif_stop_queue(dev);
1124 TX_RING(mac, txring->next_to_fill) = mactx;
1125 txring->next_to_fill++;
1126 TX_RING_INFO(mac, txring->next_to_fill).skb = skb;
1127 for (i = 0; i <= nfrags; i++) {
1128 TX_RING(mac, txring->next_to_fill+i) =
1129 XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1130 TX_RING_INFO(mac, txring->next_to_fill+i).dma = map[i];
1133 /* We have to add an even number of 8-byte entries to the ring
1134 * even if the last one is unused. That means always an odd number
1135 * of pointers + one mactx descriptor.
1140 txring->next_to_fill = (txring->next_to_fill + nfrags + 1) &
1143 dev->stats.tx_packets++;
1144 dev->stats.tx_bytes += skb->len;
1146 spin_unlock_irqrestore(&txring->lock, flags);
1148 write_dma_reg(mac, PAS_DMA_TXCHAN_INCR(mac->dma_txch), (nfrags+2) >> 1);
1150 return NETDEV_TX_OK;
1153 spin_unlock_irqrestore(&txring->lock, flags);
1156 pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
1159 return NETDEV_TX_BUSY;
1162 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1164 struct pasemi_mac *mac = netdev_priv(dev);
1167 flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1169 /* Set promiscuous */
1170 if (dev->flags & IFF_PROMISC)
1171 flags |= PAS_MAC_CFG_PCFG_PR;
1173 flags &= ~PAS_MAC_CFG_PCFG_PR;
1175 write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1179 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1181 struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1182 struct net_device *dev = mac->netdev;
1185 pasemi_mac_clean_tx(mac);
1186 pkts = pasemi_mac_clean_rx(mac, budget);
1187 if (pkts < budget) {
1188 /* all done, no more packets present */
1189 netif_rx_complete(dev, napi);
1191 pasemi_mac_restart_rx_intr(mac);
1196 static void __iomem * __devinit map_onedev(struct pci_dev *p, int index)
1198 struct device_node *dn;
1201 dn = pci_device_to_OF_node(p);
1205 ret = of_iomap(dn, index);
1211 /* This is hardcoded and ugly, but we have some firmware versions
1212 * that don't provide the register space in the device tree. Luckily
1213 * they are at well-known locations so we can just do the math here.
1215 return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);
1218 static int __devinit pasemi_mac_map_regs(struct pasemi_mac *mac)
1220 struct resource res;
1221 struct device_node *dn;
1224 mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1225 if (!mac->dma_pdev) {
1226 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1230 mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1231 if (!mac->iob_pdev) {
1232 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1236 mac->regs = map_onedev(mac->pdev, 0);
1237 mac->dma_regs = map_onedev(mac->dma_pdev, 0);
1238 mac->iob_regs = map_onedev(mac->iob_pdev, 0);
1240 if (!mac->regs || !mac->dma_regs || !mac->iob_regs) {
1241 dev_err(&mac->pdev->dev, "Can't map registers\n");
1245 /* The dma status structure is located in the I/O bridge, and
1246 * is cache coherent.
1249 dn = pci_device_to_OF_node(mac->iob_pdev);
1251 err = of_address_to_resource(dn, 1, &res);
1253 /* Fallback for old firmware */
1254 res.start = 0xfd800000;
1255 res.end = res.start + 0x1000;
1257 dma_status = __ioremap(res.start, res.end-res.start, 0);
1263 static int __devinit
1264 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1266 static int index = 0;
1267 struct net_device *dev;
1268 struct pasemi_mac *mac;
1270 DECLARE_MAC_BUF(mac_buf);
1272 err = pci_enable_device(pdev);
1276 dev = alloc_etherdev(sizeof(struct pasemi_mac));
1279 "pasemi_mac: Could not allocate ethernet device.\n");
1281 goto out_disable_device;
1284 pci_set_drvdata(pdev, dev);
1285 SET_NETDEV_DEV(dev, &pdev->dev);
1287 mac = netdev_priv(dev);
1292 netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
1294 dev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX | NETIF_F_SG;
1296 /* These should come out of the device tree eventually */
1297 mac->dma_txch = index;
1298 mac->dma_rxch = index;
1300 /* We probe GMAC before XAUI, but the DMA interfaces are
1301 * in XAUI, GMAC order.
1304 mac->dma_if = index + 2;
1306 mac->dma_if = index - 4;
1309 switch (pdev->device) {
1311 mac->type = MAC_TYPE_GMAC;
1314 mac->type = MAC_TYPE_XAUI;
1321 /* get mac addr from device tree */
1322 if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1326 memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1328 dev->open = pasemi_mac_open;
1329 dev->stop = pasemi_mac_close;
1330 dev->hard_start_xmit = pasemi_mac_start_tx;
1331 dev->set_multicast_list = pasemi_mac_set_rx_mode;
1333 err = pasemi_mac_map_regs(mac);
1337 mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
1338 mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
1340 mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1342 /* Enable most messages by default */
1343 mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1345 err = register_netdev(dev);
1348 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1351 } else if netif_msg_probe(mac)
1352 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
1354 dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1355 mac->dma_if, mac->dma_txch, mac->dma_rxch,
1356 print_mac(mac_buf, dev->dev_addr));
1362 pci_dev_put(mac->iob_pdev);
1364 pci_dev_put(mac->dma_pdev);
1366 iounmap(mac->dma_regs);
1368 iounmap(mac->iob_regs);
1374 pci_disable_device(pdev);
1379 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1381 struct net_device *netdev = pci_get_drvdata(pdev);
1382 struct pasemi_mac *mac;
1387 mac = netdev_priv(netdev);
1389 unregister_netdev(netdev);
1391 pci_disable_device(pdev);
1392 pci_dev_put(mac->dma_pdev);
1393 pci_dev_put(mac->iob_pdev);
1396 iounmap(mac->dma_regs);
1397 iounmap(mac->iob_regs);
1399 pci_set_drvdata(pdev, NULL);
1400 free_netdev(netdev);
1403 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1404 { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1405 { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1409 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1411 static struct pci_driver pasemi_mac_driver = {
1412 .name = "pasemi_mac",
1413 .id_table = pasemi_mac_pci_tbl,
1414 .probe = pasemi_mac_probe,
1415 .remove = __devexit_p(pasemi_mac_remove),
1418 static void __exit pasemi_mac_cleanup_module(void)
1420 pci_unregister_driver(&pasemi_mac_driver);
1421 __iounmap(dma_status);
1425 int pasemi_mac_init_module(void)
1427 return pci_register_driver(&pasemi_mac_driver);
1430 module_init(pasemi_mac_init_module);
1431 module_exit(pasemi_mac_cleanup_module);