2 * linux/drivers/net/ethernet/ethoc.c
4 * Copyright (C) 2007-2008 Avionic Design Development GmbH
5 * Copyright (C) 2008-2009 Avionic Design GmbH
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * Written by Thierry Reding <thierry.reding@avionic-design.de>
14 #include <linux/dma-mapping.h>
15 #include <linux/etherdevice.h>
16 #include <linux/crc32.h>
17 #include <linux/interrupt.h>
19 #include <linux/mii.h>
20 #include <linux/phy.h>
21 #include <linux/platform_device.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <net/ethoc.h>
28 static int buffer_size = 0x8000; /* 32 KBytes */
29 module_param(buffer_size, int, 0);
30 MODULE_PARM_DESC(buffer_size, "DMA buffer allocation size");
32 /* register offsets */
34 #define INT_SOURCE 0x04
39 #define PACKETLEN 0x18
41 #define TX_BD_NUM 0x20
42 #define CTRLMODER 0x24
44 #define MIICOMMAND 0x2c
45 #define MIIADDRESS 0x30
46 #define MIITX_DATA 0x34
47 #define MIIRX_DATA 0x38
48 #define MIISTATUS 0x3c
49 #define MAC_ADDR0 0x40
50 #define MAC_ADDR1 0x44
51 #define ETH_HASH0 0x48
52 #define ETH_HASH1 0x4c
53 #define ETH_TXCTRL 0x50
56 #define MODER_RXEN (1 << 0) /* receive enable */
57 #define MODER_TXEN (1 << 1) /* transmit enable */
58 #define MODER_NOPRE (1 << 2) /* no preamble */
59 #define MODER_BRO (1 << 3) /* broadcast address */
60 #define MODER_IAM (1 << 4) /* individual address mode */
61 #define MODER_PRO (1 << 5) /* promiscuous mode */
62 #define MODER_IFG (1 << 6) /* interframe gap for incoming frames */
63 #define MODER_LOOP (1 << 7) /* loopback */
64 #define MODER_NBO (1 << 8) /* no back-off */
65 #define MODER_EDE (1 << 9) /* excess defer enable */
66 #define MODER_FULLD (1 << 10) /* full duplex */
67 #define MODER_RESET (1 << 11) /* FIXME: reset (undocumented) */
68 #define MODER_DCRC (1 << 12) /* delayed CRC enable */
69 #define MODER_CRC (1 << 13) /* CRC enable */
70 #define MODER_HUGE (1 << 14) /* huge packets enable */
71 #define MODER_PAD (1 << 15) /* padding enabled */
72 #define MODER_RSM (1 << 16) /* receive small packets */
74 /* interrupt source and mask registers */
75 #define INT_MASK_TXF (1 << 0) /* transmit frame */
76 #define INT_MASK_TXE (1 << 1) /* transmit error */
77 #define INT_MASK_RXF (1 << 2) /* receive frame */
78 #define INT_MASK_RXE (1 << 3) /* receive error */
79 #define INT_MASK_BUSY (1 << 4)
80 #define INT_MASK_TXC (1 << 5) /* transmit control frame */
81 #define INT_MASK_RXC (1 << 6) /* receive control frame */
83 #define INT_MASK_TX (INT_MASK_TXF | INT_MASK_TXE)
84 #define INT_MASK_RX (INT_MASK_RXF | INT_MASK_RXE)
86 #define INT_MASK_ALL ( \
87 INT_MASK_TXF | INT_MASK_TXE | \
88 INT_MASK_RXF | INT_MASK_RXE | \
89 INT_MASK_TXC | INT_MASK_RXC | \
93 /* packet length register */
94 #define PACKETLEN_MIN(min) (((min) & 0xffff) << 16)
95 #define PACKETLEN_MAX(max) (((max) & 0xffff) << 0)
96 #define PACKETLEN_MIN_MAX(min, max) (PACKETLEN_MIN(min) | \
99 /* transmit buffer number register */
100 #define TX_BD_NUM_VAL(x) (((x) <= 0x80) ? (x) : 0x80)
102 /* control module mode register */
103 #define CTRLMODER_PASSALL (1 << 0) /* pass all receive frames */
104 #define CTRLMODER_RXFLOW (1 << 1) /* receive control flow */
105 #define CTRLMODER_TXFLOW (1 << 2) /* transmit control flow */
107 /* MII mode register */
108 #define MIIMODER_CLKDIV(x) ((x) & 0xfe) /* needs to be an even number */
109 #define MIIMODER_NOPRE (1 << 8) /* no preamble */
111 /* MII command register */
112 #define MIICOMMAND_SCAN (1 << 0) /* scan status */
113 #define MIICOMMAND_READ (1 << 1) /* read status */
114 #define MIICOMMAND_WRITE (1 << 2) /* write control data */
116 /* MII address register */
117 #define MIIADDRESS_FIAD(x) (((x) & 0x1f) << 0)
118 #define MIIADDRESS_RGAD(x) (((x) & 0x1f) << 8)
119 #define MIIADDRESS_ADDR(phy, reg) (MIIADDRESS_FIAD(phy) | \
120 MIIADDRESS_RGAD(reg))
122 /* MII transmit data register */
123 #define MIITX_DATA_VAL(x) ((x) & 0xffff)
125 /* MII receive data register */
126 #define MIIRX_DATA_VAL(x) ((x) & 0xffff)
128 /* MII status register */
129 #define MIISTATUS_LINKFAIL (1 << 0)
130 #define MIISTATUS_BUSY (1 << 1)
131 #define MIISTATUS_INVALID (1 << 2)
133 /* TX buffer descriptor */
134 #define TX_BD_CS (1 << 0) /* carrier sense lost */
135 #define TX_BD_DF (1 << 1) /* defer indication */
136 #define TX_BD_LC (1 << 2) /* late collision */
137 #define TX_BD_RL (1 << 3) /* retransmission limit */
138 #define TX_BD_RETRY_MASK (0x00f0)
139 #define TX_BD_RETRY(x) (((x) & 0x00f0) >> 4)
140 #define TX_BD_UR (1 << 8) /* transmitter underrun */
141 #define TX_BD_CRC (1 << 11) /* TX CRC enable */
142 #define TX_BD_PAD (1 << 12) /* pad enable for short packets */
143 #define TX_BD_WRAP (1 << 13)
144 #define TX_BD_IRQ (1 << 14) /* interrupt request enable */
145 #define TX_BD_READY (1 << 15) /* TX buffer ready */
146 #define TX_BD_LEN(x) (((x) & 0xffff) << 16)
147 #define TX_BD_LEN_MASK (0xffff << 16)
149 #define TX_BD_STATS (TX_BD_CS | TX_BD_DF | TX_BD_LC | \
150 TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR)
152 /* RX buffer descriptor */
153 #define RX_BD_LC (1 << 0) /* late collision */
154 #define RX_BD_CRC (1 << 1) /* RX CRC error */
155 #define RX_BD_SF (1 << 2) /* short frame */
156 #define RX_BD_TL (1 << 3) /* too long */
157 #define RX_BD_DN (1 << 4) /* dribble nibble */
158 #define RX_BD_IS (1 << 5) /* invalid symbol */
159 #define RX_BD_OR (1 << 6) /* receiver overrun */
160 #define RX_BD_MISS (1 << 7)
161 #define RX_BD_CF (1 << 8) /* control frame */
162 #define RX_BD_WRAP (1 << 13)
163 #define RX_BD_IRQ (1 << 14) /* interrupt request enable */
164 #define RX_BD_EMPTY (1 << 15)
165 #define RX_BD_LEN(x) (((x) & 0xffff) << 16)
167 #define RX_BD_STATS (RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \
168 RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS)
170 #define ETHOC_BUFSIZ 1536
171 #define ETHOC_ZLEN 64
172 #define ETHOC_BD_BASE 0x400
173 #define ETHOC_TIMEOUT (HZ / 2)
174 #define ETHOC_MII_TIMEOUT (1 + (HZ / 5))
177 * struct ethoc - driver-private device structure
178 * @iobase: pointer to I/O memory region
179 * @membase: pointer to buffer memory region
180 * @dma_alloc: dma allocated buffer size
181 * @io_region_size: I/O memory region size
182 * @num_tx: number of send buffers
183 * @cur_tx: last send buffer written
184 * @dty_tx: last buffer actually sent
185 * @num_rx: number of receive buffers
186 * @cur_rx: current receive buffer
187 * @vma: pointer to array of virtual memory addresses for buffers
188 * @netdev: pointer to network device structure
189 * @napi: NAPI structure
190 * @msg_enable: device state flags
193 * @mdio: MDIO bus for PHY access
194 * @phy_id: address of attached PHY
197 void __iomem *iobase;
198 void __iomem *membase;
200 resource_size_t io_region_size;
211 struct net_device *netdev;
212 struct napi_struct napi;
217 struct phy_device *phy;
218 struct mii_bus *mdio;
223 * struct ethoc_bd - buffer descriptor
224 * @stat: buffer statistics
225 * @addr: physical memory address
232 static inline u32 ethoc_read(struct ethoc *dev, loff_t offset)
234 return ioread32(dev->iobase + offset);
237 static inline void ethoc_write(struct ethoc *dev, loff_t offset, u32 data)
239 iowrite32(data, dev->iobase + offset);
242 static inline void ethoc_read_bd(struct ethoc *dev, int index,
245 loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
246 bd->stat = ethoc_read(dev, offset + 0);
247 bd->addr = ethoc_read(dev, offset + 4);
250 static inline void ethoc_write_bd(struct ethoc *dev, int index,
251 const struct ethoc_bd *bd)
253 loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
254 ethoc_write(dev, offset + 0, bd->stat);
255 ethoc_write(dev, offset + 4, bd->addr);
258 static inline void ethoc_enable_irq(struct ethoc *dev, u32 mask)
260 u32 imask = ethoc_read(dev, INT_MASK);
262 ethoc_write(dev, INT_MASK, imask);
265 static inline void ethoc_disable_irq(struct ethoc *dev, u32 mask)
267 u32 imask = ethoc_read(dev, INT_MASK);
269 ethoc_write(dev, INT_MASK, imask);
272 static inline void ethoc_ack_irq(struct ethoc *dev, u32 mask)
274 ethoc_write(dev, INT_SOURCE, mask);
277 static inline void ethoc_enable_rx_and_tx(struct ethoc *dev)
279 u32 mode = ethoc_read(dev, MODER);
280 mode |= MODER_RXEN | MODER_TXEN;
281 ethoc_write(dev, MODER, mode);
284 static inline void ethoc_disable_rx_and_tx(struct ethoc *dev)
286 u32 mode = ethoc_read(dev, MODER);
287 mode &= ~(MODER_RXEN | MODER_TXEN);
288 ethoc_write(dev, MODER, mode);
291 static int ethoc_init_ring(struct ethoc *dev, unsigned long mem_start)
301 ethoc_write(dev, TX_BD_NUM, dev->num_tx);
303 /* setup transmission buffers */
305 bd.stat = TX_BD_IRQ | TX_BD_CRC;
308 for (i = 0; i < dev->num_tx; i++) {
309 if (i == dev->num_tx - 1)
310 bd.stat |= TX_BD_WRAP;
312 ethoc_write_bd(dev, i, &bd);
313 bd.addr += ETHOC_BUFSIZ;
319 bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
321 for (i = 0; i < dev->num_rx; i++) {
322 if (i == dev->num_rx - 1)
323 bd.stat |= RX_BD_WRAP;
325 ethoc_write_bd(dev, dev->num_tx + i, &bd);
326 bd.addr += ETHOC_BUFSIZ;
328 dev->vma[dev->num_tx + i] = vma;
335 static int ethoc_reset(struct ethoc *dev)
339 /* TODO: reset controller? */
341 ethoc_disable_rx_and_tx(dev);
343 /* TODO: setup registers */
345 /* enable FCS generation and automatic padding */
346 mode = ethoc_read(dev, MODER);
347 mode |= MODER_CRC | MODER_PAD;
348 ethoc_write(dev, MODER, mode);
350 /* set full-duplex mode */
351 mode = ethoc_read(dev, MODER);
353 ethoc_write(dev, MODER, mode);
354 ethoc_write(dev, IPGT, 0x15);
356 ethoc_ack_irq(dev, INT_MASK_ALL);
357 ethoc_enable_irq(dev, INT_MASK_ALL);
358 ethoc_enable_rx_and_tx(dev);
362 static unsigned int ethoc_update_rx_stats(struct ethoc *dev,
365 struct net_device *netdev = dev->netdev;
366 unsigned int ret = 0;
368 if (bd->stat & RX_BD_TL) {
369 dev_err(&netdev->dev, "RX: frame too long\n");
370 netdev->stats.rx_length_errors++;
374 if (bd->stat & RX_BD_SF) {
375 dev_err(&netdev->dev, "RX: frame too short\n");
376 netdev->stats.rx_length_errors++;
380 if (bd->stat & RX_BD_DN) {
381 dev_err(&netdev->dev, "RX: dribble nibble\n");
382 netdev->stats.rx_frame_errors++;
385 if (bd->stat & RX_BD_CRC) {
386 dev_err(&netdev->dev, "RX: wrong CRC\n");
387 netdev->stats.rx_crc_errors++;
391 if (bd->stat & RX_BD_OR) {
392 dev_err(&netdev->dev, "RX: overrun\n");
393 netdev->stats.rx_over_errors++;
397 if (bd->stat & RX_BD_MISS)
398 netdev->stats.rx_missed_errors++;
400 if (bd->stat & RX_BD_LC) {
401 dev_err(&netdev->dev, "RX: late collision\n");
402 netdev->stats.collisions++;
409 static int ethoc_rx(struct net_device *dev, int limit)
411 struct ethoc *priv = netdev_priv(dev);
414 for (count = 0; count < limit; ++count) {
418 entry = priv->num_tx + priv->cur_rx;
419 ethoc_read_bd(priv, entry, &bd);
420 if (bd.stat & RX_BD_EMPTY) {
421 ethoc_ack_irq(priv, INT_MASK_RX);
422 /* If packet (interrupt) came in between checking
423 * BD_EMTPY and clearing the interrupt source, then we
424 * risk missing the packet as the RX interrupt won't
425 * trigger right away when we reenable it; hence, check
426 * BD_EMTPY here again to make sure there isn't such a
427 * packet waiting for us...
429 ethoc_read_bd(priv, entry, &bd);
430 if (bd.stat & RX_BD_EMPTY)
434 if (ethoc_update_rx_stats(priv, &bd) == 0) {
435 int size = bd.stat >> 16;
438 size -= 4; /* strip the CRC */
439 skb = netdev_alloc_skb_ip_align(dev, size);
442 void *src = priv->vma[entry];
443 memcpy_fromio(skb_put(skb, size), src, size);
444 skb->protocol = eth_type_trans(skb, dev);
445 dev->stats.rx_packets++;
446 dev->stats.rx_bytes += size;
447 netif_receive_skb(skb);
451 "low on memory - packet dropped\n");
453 dev->stats.rx_dropped++;
458 /* clear the buffer descriptor so it can be reused */
459 bd.stat &= ~RX_BD_STATS;
460 bd.stat |= RX_BD_EMPTY;
461 ethoc_write_bd(priv, entry, &bd);
462 if (++priv->cur_rx == priv->num_rx)
469 static void ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd)
471 struct net_device *netdev = dev->netdev;
473 if (bd->stat & TX_BD_LC) {
474 dev_err(&netdev->dev, "TX: late collision\n");
475 netdev->stats.tx_window_errors++;
478 if (bd->stat & TX_BD_RL) {
479 dev_err(&netdev->dev, "TX: retransmit limit\n");
480 netdev->stats.tx_aborted_errors++;
483 if (bd->stat & TX_BD_UR) {
484 dev_err(&netdev->dev, "TX: underrun\n");
485 netdev->stats.tx_fifo_errors++;
488 if (bd->stat & TX_BD_CS) {
489 dev_err(&netdev->dev, "TX: carrier sense lost\n");
490 netdev->stats.tx_carrier_errors++;
493 if (bd->stat & TX_BD_STATS)
494 netdev->stats.tx_errors++;
496 netdev->stats.collisions += (bd->stat >> 4) & 0xf;
497 netdev->stats.tx_bytes += bd->stat >> 16;
498 netdev->stats.tx_packets++;
501 static int ethoc_tx(struct net_device *dev, int limit)
503 struct ethoc *priv = netdev_priv(dev);
507 for (count = 0; count < limit; ++count) {
510 entry = priv->dty_tx & (priv->num_tx-1);
512 ethoc_read_bd(priv, entry, &bd);
514 if (bd.stat & TX_BD_READY || (priv->dty_tx == priv->cur_tx)) {
515 ethoc_ack_irq(priv, INT_MASK_TX);
516 /* If interrupt came in between reading in the BD
517 * and clearing the interrupt source, then we risk
518 * missing the event as the TX interrupt won't trigger
519 * right away when we reenable it; hence, check
520 * BD_EMPTY here again to make sure there isn't such an
523 ethoc_read_bd(priv, entry, &bd);
524 if (bd.stat & TX_BD_READY ||
525 (priv->dty_tx == priv->cur_tx))
529 ethoc_update_tx_stats(priv, &bd);
533 if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2))
534 netif_wake_queue(dev);
539 static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
541 struct net_device *dev = dev_id;
542 struct ethoc *priv = netdev_priv(dev);
546 /* Figure out what triggered the interrupt...
547 * The tricky bit here is that the interrupt source bits get
548 * set in INT_SOURCE for an event regardless of whether that
549 * event is masked or not. Thus, in order to figure out what
550 * triggered the interrupt, we need to remove the sources
551 * for all events that are currently masked. This behaviour
552 * is not particularly well documented but reasonable...
554 mask = ethoc_read(priv, INT_MASK);
555 pending = ethoc_read(priv, INT_SOURCE);
558 if (unlikely(pending == 0))
561 ethoc_ack_irq(priv, pending);
563 /* We always handle the dropped packet interrupt */
564 if (pending & INT_MASK_BUSY) {
565 dev_err(&dev->dev, "packet dropped\n");
566 dev->stats.rx_dropped++;
569 /* Handle receive/transmit event by switching to polling */
570 if (pending & (INT_MASK_TX | INT_MASK_RX)) {
571 ethoc_disable_irq(priv, INT_MASK_TX | INT_MASK_RX);
572 napi_schedule(&priv->napi);
578 static int ethoc_get_mac_address(struct net_device *dev, void *addr)
580 struct ethoc *priv = netdev_priv(dev);
581 u8 *mac = (u8 *)addr;
584 reg = ethoc_read(priv, MAC_ADDR0);
585 mac[2] = (reg >> 24) & 0xff;
586 mac[3] = (reg >> 16) & 0xff;
587 mac[4] = (reg >> 8) & 0xff;
588 mac[5] = (reg >> 0) & 0xff;
590 reg = ethoc_read(priv, MAC_ADDR1);
591 mac[0] = (reg >> 8) & 0xff;
592 mac[1] = (reg >> 0) & 0xff;
597 static int ethoc_poll(struct napi_struct *napi, int budget)
599 struct ethoc *priv = container_of(napi, struct ethoc, napi);
600 int rx_work_done = 0;
601 int tx_work_done = 0;
603 rx_work_done = ethoc_rx(priv->netdev, budget);
604 tx_work_done = ethoc_tx(priv->netdev, budget);
606 if (rx_work_done < budget && tx_work_done < budget) {
608 ethoc_enable_irq(priv, INT_MASK_TX | INT_MASK_RX);
614 static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg)
616 struct ethoc *priv = bus->priv;
619 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
620 ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ);
622 for (i = 0; i < 5; i++) {
623 u32 status = ethoc_read(priv, MIISTATUS);
624 if (!(status & MIISTATUS_BUSY)) {
625 u32 data = ethoc_read(priv, MIIRX_DATA);
626 /* reset MII command register */
627 ethoc_write(priv, MIICOMMAND, 0);
630 usleep_range(100, 200);
636 static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
638 struct ethoc *priv = bus->priv;
641 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
642 ethoc_write(priv, MIITX_DATA, val);
643 ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE);
645 for (i = 0; i < 5; i++) {
646 u32 stat = ethoc_read(priv, MIISTATUS);
647 if (!(stat & MIISTATUS_BUSY)) {
648 /* reset MII command register */
649 ethoc_write(priv, MIICOMMAND, 0);
652 usleep_range(100, 200);
658 static int ethoc_mdio_reset(struct mii_bus *bus)
663 static void ethoc_mdio_poll(struct net_device *dev)
667 static int ethoc_mdio_probe(struct net_device *dev)
669 struct ethoc *priv = netdev_priv(dev);
670 struct phy_device *phy;
673 if (priv->phy_id != -1)
674 phy = priv->mdio->phy_map[priv->phy_id];
676 phy = phy_find_first(priv->mdio);
679 dev_err(&dev->dev, "no PHY found\n");
683 err = phy_connect_direct(dev, phy, ethoc_mdio_poll,
684 PHY_INTERFACE_MODE_GMII);
686 dev_err(&dev->dev, "could not attach to PHY\n");
694 static int ethoc_open(struct net_device *dev)
696 struct ethoc *priv = netdev_priv(dev);
699 ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED,
704 ethoc_init_ring(priv, dev->mem_start);
707 if (netif_queue_stopped(dev)) {
708 dev_dbg(&dev->dev, " resuming queue\n");
709 netif_wake_queue(dev);
711 dev_dbg(&dev->dev, " starting queue\n");
712 netif_start_queue(dev);
715 phy_start(priv->phy);
716 napi_enable(&priv->napi);
718 if (netif_msg_ifup(priv)) {
719 dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n",
720 dev->base_addr, dev->mem_start, dev->mem_end);
726 static int ethoc_stop(struct net_device *dev)
728 struct ethoc *priv = netdev_priv(dev);
730 napi_disable(&priv->napi);
735 ethoc_disable_rx_and_tx(priv);
736 free_irq(dev->irq, dev);
738 if (!netif_queue_stopped(dev))
739 netif_stop_queue(dev);
744 static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
746 struct ethoc *priv = netdev_priv(dev);
747 struct mii_ioctl_data *mdio = if_mii(ifr);
748 struct phy_device *phy = NULL;
750 if (!netif_running(dev))
753 if (cmd != SIOCGMIIPHY) {
754 if (mdio->phy_id >= PHY_MAX_ADDR)
757 phy = priv->mdio->phy_map[mdio->phy_id];
764 return phy_mii_ioctl(phy, ifr, cmd);
767 static int ethoc_config(struct net_device *dev, struct ifmap *map)
772 static void ethoc_do_set_mac_address(struct net_device *dev)
774 struct ethoc *priv = netdev_priv(dev);
775 unsigned char *mac = dev->dev_addr;
777 ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) |
778 (mac[4] << 8) | (mac[5] << 0));
779 ethoc_write(priv, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0));
782 static int ethoc_set_mac_address(struct net_device *dev, void *p)
784 const struct sockaddr *addr = p;
786 if (!is_valid_ether_addr(addr->sa_data))
787 return -EADDRNOTAVAIL;
788 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
789 ethoc_do_set_mac_address(dev);
793 static void ethoc_set_multicast_list(struct net_device *dev)
795 struct ethoc *priv = netdev_priv(dev);
796 u32 mode = ethoc_read(priv, MODER);
797 struct netdev_hw_addr *ha;
798 u32 hash[2] = { 0, 0 };
800 /* set loopback mode if requested */
801 if (dev->flags & IFF_LOOPBACK)
806 /* receive broadcast frames if requested */
807 if (dev->flags & IFF_BROADCAST)
812 /* enable promiscuous mode if requested */
813 if (dev->flags & IFF_PROMISC)
818 ethoc_write(priv, MODER, mode);
820 /* receive multicast frames */
821 if (dev->flags & IFF_ALLMULTI) {
822 hash[0] = 0xffffffff;
823 hash[1] = 0xffffffff;
825 netdev_for_each_mc_addr(ha, dev) {
826 u32 crc = ether_crc(ETH_ALEN, ha->addr);
827 int bit = (crc >> 26) & 0x3f;
828 hash[bit >> 5] |= 1 << (bit & 0x1f);
832 ethoc_write(priv, ETH_HASH0, hash[0]);
833 ethoc_write(priv, ETH_HASH1, hash[1]);
836 static int ethoc_change_mtu(struct net_device *dev, int new_mtu)
841 static void ethoc_tx_timeout(struct net_device *dev)
843 struct ethoc *priv = netdev_priv(dev);
844 u32 pending = ethoc_read(priv, INT_SOURCE);
846 ethoc_interrupt(dev->irq, dev);
849 static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
851 struct ethoc *priv = netdev_priv(dev);
856 if (unlikely(skb->len > ETHOC_BUFSIZ)) {
857 dev->stats.tx_errors++;
861 entry = priv->cur_tx % priv->num_tx;
862 spin_lock_irq(&priv->lock);
865 ethoc_read_bd(priv, entry, &bd);
866 if (unlikely(skb->len < ETHOC_ZLEN))
867 bd.stat |= TX_BD_PAD;
869 bd.stat &= ~TX_BD_PAD;
871 dest = priv->vma[entry];
872 memcpy_toio(dest, skb->data, skb->len);
874 bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
875 bd.stat |= TX_BD_LEN(skb->len);
876 ethoc_write_bd(priv, entry, &bd);
878 bd.stat |= TX_BD_READY;
879 ethoc_write_bd(priv, entry, &bd);
881 if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) {
882 dev_dbg(&dev->dev, "stopping queue\n");
883 netif_stop_queue(dev);
886 spin_unlock_irq(&priv->lock);
887 skb_tx_timestamp(skb);
893 static const struct net_device_ops ethoc_netdev_ops = {
894 .ndo_open = ethoc_open,
895 .ndo_stop = ethoc_stop,
896 .ndo_do_ioctl = ethoc_ioctl,
897 .ndo_set_config = ethoc_config,
898 .ndo_set_mac_address = ethoc_set_mac_address,
899 .ndo_set_rx_mode = ethoc_set_multicast_list,
900 .ndo_change_mtu = ethoc_change_mtu,
901 .ndo_tx_timeout = ethoc_tx_timeout,
902 .ndo_start_xmit = ethoc_start_xmit,
906 * ethoc_probe - initialize OpenCores ethernet MAC
907 * pdev: platform device
909 static int ethoc_probe(struct platform_device *pdev)
911 struct net_device *netdev = NULL;
912 struct resource *res = NULL;
913 struct resource *mmio = NULL;
914 struct resource *mem = NULL;
915 struct ethoc *priv = NULL;
919 bool random_mac = false;
921 /* allocate networking device */
922 netdev = alloc_etherdev(sizeof(struct ethoc));
928 SET_NETDEV_DEV(netdev, &pdev->dev);
929 platform_set_drvdata(pdev, netdev);
931 /* obtain I/O memory space */
932 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
934 dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
939 mmio = devm_request_mem_region(&pdev->dev, res->start,
940 resource_size(res), res->name);
942 dev_err(&pdev->dev, "cannot request I/O memory space\n");
947 netdev->base_addr = mmio->start;
949 /* obtain buffer memory space */
950 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
952 mem = devm_request_mem_region(&pdev->dev, res->start,
953 resource_size(res), res->name);
955 dev_err(&pdev->dev, "cannot request memory space\n");
960 netdev->mem_start = mem->start;
961 netdev->mem_end = mem->end;
965 /* obtain device IRQ number */
966 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
968 dev_err(&pdev->dev, "cannot obtain IRQ\n");
973 netdev->irq = res->start;
975 /* setup driver-private data */
976 priv = netdev_priv(netdev);
977 priv->netdev = netdev;
979 priv->io_region_size = resource_size(mmio);
981 priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr,
982 resource_size(mmio));
984 dev_err(&pdev->dev, "cannot remap I/O memory space\n");
989 if (netdev->mem_end) {
990 priv->membase = devm_ioremap_nocache(&pdev->dev,
991 netdev->mem_start, resource_size(mem));
992 if (!priv->membase) {
993 dev_err(&pdev->dev, "cannot remap memory space\n");
998 /* Allocate buffer memory */
999 priv->membase = dmam_alloc_coherent(&pdev->dev,
1000 buffer_size, (void *)&netdev->mem_start,
1002 if (!priv->membase) {
1003 dev_err(&pdev->dev, "cannot allocate %dB buffer\n",
1008 netdev->mem_end = netdev->mem_start + buffer_size;
1009 priv->dma_alloc = buffer_size;
1012 /* calculate the number of TX/RX buffers, maximum 128 supported */
1013 num_bd = min_t(unsigned int,
1014 128, (netdev->mem_end - netdev->mem_start + 1) / ETHOC_BUFSIZ);
1019 /* num_tx must be a power of two */
1020 priv->num_tx = rounddown_pow_of_two(num_bd >> 1);
1021 priv->num_rx = num_bd - priv->num_tx;
1023 dev_dbg(&pdev->dev, "ethoc: num_tx: %d num_rx: %d\n",
1024 priv->num_tx, priv->num_rx);
1026 priv->vma = devm_kzalloc(&pdev->dev, num_bd*sizeof(void *), GFP_KERNEL);
1032 /* Allow the platform setup code to pass in a MAC address. */
1033 if (pdev->dev.platform_data) {
1034 struct ethoc_platform_data *pdata = pdev->dev.platform_data;
1035 memcpy(netdev->dev_addr, pdata->hwaddr, IFHWADDRLEN);
1036 priv->phy_id = pdata->phy_id;
1044 mac = of_get_property(pdev->dev.of_node,
1045 "local-mac-address",
1048 memcpy(netdev->dev_addr, mac, IFHWADDRLEN);
1053 /* Check that the given MAC address is valid. If it isn't, read the
1054 * current MAC from the controller.
1056 if (!is_valid_ether_addr(netdev->dev_addr))
1057 ethoc_get_mac_address(netdev, netdev->dev_addr);
1059 /* Check the MAC again for validity, if it still isn't choose and
1060 * program a random one.
1062 if (!is_valid_ether_addr(netdev->dev_addr)) {
1063 eth_random_addr(netdev->dev_addr);
1067 ethoc_do_set_mac_address(netdev);
1070 netdev->addr_assign_type = NET_ADDR_RANDOM;
1072 /* register MII bus */
1073 priv->mdio = mdiobus_alloc();
1079 priv->mdio->name = "ethoc-mdio";
1080 snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d",
1081 priv->mdio->name, pdev->id);
1082 priv->mdio->read = ethoc_mdio_read;
1083 priv->mdio->write = ethoc_mdio_write;
1084 priv->mdio->reset = ethoc_mdio_reset;
1085 priv->mdio->priv = priv;
1087 priv->mdio->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
1088 if (!priv->mdio->irq) {
1093 for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1094 priv->mdio->irq[phy] = PHY_POLL;
1096 ret = mdiobus_register(priv->mdio);
1098 dev_err(&netdev->dev, "failed to register MDIO bus\n");
1102 ret = ethoc_mdio_probe(netdev);
1104 dev_err(&netdev->dev, "failed to probe MDIO bus\n");
1108 ether_setup(netdev);
1110 /* setup the net_device structure */
1111 netdev->netdev_ops = ðoc_netdev_ops;
1112 netdev->watchdog_timeo = ETHOC_TIMEOUT;
1113 netdev->features |= 0;
1116 netif_napi_add(netdev, &priv->napi, ethoc_poll, 64);
1118 spin_lock_init(&priv->lock);
1120 ret = register_netdev(netdev);
1122 dev_err(&netdev->dev, "failed to register interface\n");
1129 netif_napi_del(&priv->napi);
1131 mdiobus_unregister(priv->mdio);
1133 kfree(priv->mdio->irq);
1134 mdiobus_free(priv->mdio);
1136 free_netdev(netdev);
1142 * ethoc_remove - shutdown OpenCores ethernet MAC
1143 * @pdev: platform device
1145 static int ethoc_remove(struct platform_device *pdev)
1147 struct net_device *netdev = platform_get_drvdata(pdev);
1148 struct ethoc *priv = netdev_priv(netdev);
1151 netif_napi_del(&priv->napi);
1152 phy_disconnect(priv->phy);
1156 mdiobus_unregister(priv->mdio);
1157 kfree(priv->mdio->irq);
1158 mdiobus_free(priv->mdio);
1160 unregister_netdev(netdev);
1161 free_netdev(netdev);
1168 static int ethoc_suspend(struct platform_device *pdev, pm_message_t state)
1173 static int ethoc_resume(struct platform_device *pdev)
1178 # define ethoc_suspend NULL
1179 # define ethoc_resume NULL
1182 static struct of_device_id ethoc_match[] = {
1183 { .compatible = "opencores,ethoc", },
1186 MODULE_DEVICE_TABLE(of, ethoc_match);
1188 static struct platform_driver ethoc_driver = {
1189 .probe = ethoc_probe,
1190 .remove = ethoc_remove,
1191 .suspend = ethoc_suspend,
1192 .resume = ethoc_resume,
1195 .owner = THIS_MODULE,
1196 .of_match_table = ethoc_match,
1200 module_platform_driver(ethoc_driver);
1202 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1203 MODULE_DESCRIPTION("OpenCores Ethernet MAC driver");
1204 MODULE_LICENSE("GPL v2");