1 // SPDX-License-Identifier: GPL-2.0-only
2 /* drivers/net/ethernet/micrel/ks8851.c
4 * Copyright 2009 Simtec Electronics
5 * http://www.simtec.co.uk/
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/interrupt.h>
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <linux/ethtool.h>
17 #include <linux/cache.h>
18 #include <linux/crc32.h>
19 #include <linux/mii.h>
20 #include <linux/regulator/consumer.h>
22 #include <linux/gpio.h>
23 #include <linux/of_gpio.h>
24 #include <linux/of_mdio.h>
25 #include <linux/of_net.h>
30 * ks8851_lock - register access lock
32 * @flags: Spinlock flags
34 * Claim chip register access lock
36 static void ks8851_lock(struct ks8851_net *ks, unsigned long *flags)
42 * ks8851_unlock - register access unlock
44 * @flags: Spinlock flags
46 * Release chip register access lock
48 static void ks8851_unlock(struct ks8851_net *ks, unsigned long *flags)
50 ks->unlock(ks, flags);
54 * ks8851_wrreg16 - write 16bit register value to chip
56 * @reg: The register address
57 * @val: The value to write
59 * Issue a write to put the value @val into the register specified in @reg.
61 static void ks8851_wrreg16(struct ks8851_net *ks, unsigned int reg,
64 ks->wrreg16(ks, reg, val);
68 * ks8851_rdreg16 - read 16 bit register from device
69 * @ks: The chip information
70 * @reg: The register address
72 * Read a 16bit register from the chip, returning the result
74 static unsigned int ks8851_rdreg16(struct ks8851_net *ks,
77 return ks->rdreg16(ks, reg);
81 * ks8851_soft_reset - issue one of the soft reset to the device
82 * @ks: The device state.
83 * @op: The bit(s) to set in the GRR
85 * Issue the relevant soft-reset command to the device's GRR register
88 * Note, the delays are in there as a caution to ensure that the reset
89 * has time to take effect and then complete. Since the datasheet does
90 * not currently specify the exact sequence, we have chosen something
91 * that seems to work with our device.
93 static void ks8851_soft_reset(struct ks8851_net *ks, unsigned op)
95 ks8851_wrreg16(ks, KS_GRR, op);
96 mdelay(1); /* wait a short time to effect reset */
97 ks8851_wrreg16(ks, KS_GRR, 0);
98 mdelay(1); /* wait for condition to clear */
102 * ks8851_set_powermode - set power mode of the device
103 * @ks: The device state
104 * @pwrmode: The power mode value to write to KS_PMECR.
106 * Change the power mode of the chip.
108 static void ks8851_set_powermode(struct ks8851_net *ks, unsigned pwrmode)
112 netif_dbg(ks, hw, ks->netdev, "setting power mode %d\n", pwrmode);
114 pmecr = ks8851_rdreg16(ks, KS_PMECR);
115 pmecr &= ~PMECR_PM_MASK;
118 ks8851_wrreg16(ks, KS_PMECR, pmecr);
122 * ks8851_write_mac_addr - write mac address to device registers
123 * @dev: The network device
125 * Update the KS8851 MAC address registers from the address in @dev.
127 * This call assumes that the chip is not running, so there is no need to
128 * shutdown the RXQ process whilst setting this.
130 static int ks8851_write_mac_addr(struct net_device *dev)
132 struct ks8851_net *ks = netdev_priv(dev);
137 ks8851_lock(ks, &flags);
140 * Wake up chip in case it was powered off when stopped; otherwise,
141 * the first write to the MAC address does not take effect.
143 ks8851_set_powermode(ks, PMECR_PM_NORMAL);
145 for (i = 0; i < ETH_ALEN; i += 2) {
146 val = (dev->dev_addr[i] << 8) | dev->dev_addr[i + 1];
147 ks8851_wrreg16(ks, KS_MAR(i), val);
150 if (!netif_running(dev))
151 ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
153 ks8851_unlock(ks, &flags);
159 * ks8851_read_mac_addr - read mac address from device registers
160 * @dev: The network device
162 * Update our copy of the KS8851 MAC address from the registers of @dev.
164 static void ks8851_read_mac_addr(struct net_device *dev)
166 struct ks8851_net *ks = netdev_priv(dev);
172 ks8851_lock(ks, &flags);
174 for (i = 0; i < ETH_ALEN; i += 2) {
175 reg = ks8851_rdreg16(ks, KS_MAR(i));
177 addr[i + 1] = reg & 0xff;
179 eth_hw_addr_set(dev, addr);
181 ks8851_unlock(ks, &flags);
185 * ks8851_init_mac - initialise the mac address
186 * @ks: The device structure
187 * @np: The device node pointer
189 * Get or create the initial mac address for the device and then set that
190 * into the station address register. A mac address supplied in the device
191 * tree takes precedence. Otherwise, if there is an EEPROM present, then
192 * we try that. If no valid mac address is found we use eth_random_addr()
193 * to create a new one.
195 static void ks8851_init_mac(struct ks8851_net *ks, struct device_node *np)
197 struct net_device *dev = ks->netdev;
200 ret = of_get_ethdev_address(np, dev);
202 ks8851_write_mac_addr(dev);
206 if (ks->rc_ccr & CCR_EEPROM) {
207 ks8851_read_mac_addr(dev);
208 if (is_valid_ether_addr(dev->dev_addr))
211 netdev_err(ks->netdev, "invalid mac address read %pM\n",
215 eth_hw_addr_random(dev);
216 ks8851_write_mac_addr(dev);
220 * ks8851_dbg_dumpkkt - dump initial packet contents to debug
221 * @ks: The device state
222 * @rxpkt: The data for the received packet
224 * Dump the initial data from the packet to dev_dbg().
226 static void ks8851_dbg_dumpkkt(struct ks8851_net *ks, u8 *rxpkt)
228 netdev_dbg(ks->netdev,
229 "pkt %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x\n",
230 rxpkt[4], rxpkt[5], rxpkt[6], rxpkt[7],
231 rxpkt[8], rxpkt[9], rxpkt[10], rxpkt[11],
232 rxpkt[12], rxpkt[13], rxpkt[14], rxpkt[15]);
236 * ks8851_rx_skb - receive skbuff
237 * @ks: The device state.
240 static void ks8851_rx_skb(struct ks8851_net *ks, struct sk_buff *skb)
246 * ks8851_rx_pkts - receive packets from the host
247 * @ks: The device information.
249 * This is called from the IRQ work queue when the system detects that there
250 * are packets in the receive queue. Find out how many packets there are and
251 * read them from the FIFO.
253 static void ks8851_rx_pkts(struct ks8851_net *ks)
261 rxfc = (ks8851_rdreg16(ks, KS_RXFCTR) >> 8) & 0xff;
263 netif_dbg(ks, rx_status, ks->netdev,
264 "%s: %d packets\n", __func__, rxfc);
266 /* Currently we're issuing a read per packet, but we could possibly
267 * improve the code by issuing a single read, getting the receive
268 * header, allocating the packet and then reading the packet data
271 * This form of operation would require us to hold the SPI bus'
272 * chipselect low during the entie transaction to avoid any
273 * reset to the data stream coming from the chip.
276 for (; rxfc != 0; rxfc--) {
277 rxstat = ks8851_rdreg16(ks, KS_RXFHSR);
278 rxlen = ks8851_rdreg16(ks, KS_RXFHBCR) & RXFHBCR_CNT_MASK;
280 netif_dbg(ks, rx_status, ks->netdev,
281 "rx: stat 0x%04x, len 0x%04x\n", rxstat, rxlen);
283 /* the length of the packet includes the 32bit CRC */
285 /* set dma read address */
286 ks8851_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI | 0x00);
288 /* start DMA access */
289 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA);
292 unsigned int rxalign;
295 rxalign = ALIGN(rxlen, 4);
296 skb = netdev_alloc_skb_ip_align(ks->netdev, rxalign);
299 /* 4 bytes of status header + 4 bytes of
300 * garbage: we put them before ethernet
301 * header, so that they are copied,
305 rxpkt = skb_put(skb, rxlen) - 8;
307 ks->rdfifo(ks, rxpkt, rxalign + 8);
309 if (netif_msg_pktdata(ks))
310 ks8851_dbg_dumpkkt(ks, rxpkt);
312 skb->protocol = eth_type_trans(skb, ks->netdev);
313 ks8851_rx_skb(ks, skb);
315 ks->netdev->stats.rx_packets++;
316 ks->netdev->stats.rx_bytes += rxlen;
320 /* end DMA access and dequeue packet */
321 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_RRXEF);
326 * ks8851_irq - IRQ handler for dealing with interrupt requests
330 * This handler is invoked when the IRQ line asserts to find out what happened.
331 * As we cannot allow ourselves to sleep in HARDIRQ context, this handler runs
334 * Read the interrupt status, work out what needs to be done and then clear
335 * any of the interrupts that are not needed.
337 static irqreturn_t ks8851_irq(int irq, void *_ks)
339 struct ks8851_net *ks = _ks;
340 unsigned handled = 0;
344 ks8851_lock(ks, &flags);
346 status = ks8851_rdreg16(ks, KS_ISR);
348 netif_dbg(ks, intr, ks->netdev,
349 "%s: status 0x%04x\n", __func__, status);
351 if (status & IRQ_LCI)
354 if (status & IRQ_LDI) {
355 u16 pmecr = ks8851_rdreg16(ks, KS_PMECR);
356 pmecr &= ~PMECR_WKEVT_MASK;
357 ks8851_wrreg16(ks, KS_PMECR, pmecr | PMECR_WKEVT_LINK);
362 if (status & IRQ_RXPSI)
363 handled |= IRQ_RXPSI;
365 if (status & IRQ_TXI) {
368 /* no lock here, tx queue should have been stopped */
370 /* update our idea of how much tx space is available to the
372 ks->tx_space = ks8851_rdreg16(ks, KS_TXMIR);
374 netif_dbg(ks, intr, ks->netdev,
375 "%s: txspace %d\n", __func__, ks->tx_space);
378 if (status & IRQ_RXI)
381 if (status & IRQ_SPIBEI) {
382 netdev_err(ks->netdev, "%s: spi bus error\n", __func__);
383 handled |= IRQ_SPIBEI;
386 ks8851_wrreg16(ks, KS_ISR, handled);
388 if (status & IRQ_RXI) {
389 /* the datasheet says to disable the rx interrupt during
390 * packet read-out, however we're masking the interrupt
391 * from the device so do not bother masking just the RX
392 * from the device. */
397 /* if something stopped the rx process, probably due to wanting
398 * to change the rx settings, then do something about restarting
400 if (status & IRQ_RXPSI) {
401 struct ks8851_rxctrl *rxc = &ks->rxctrl;
403 /* update the multicast hash table */
404 ks8851_wrreg16(ks, KS_MAHTR0, rxc->mchash[0]);
405 ks8851_wrreg16(ks, KS_MAHTR1, rxc->mchash[1]);
406 ks8851_wrreg16(ks, KS_MAHTR2, rxc->mchash[2]);
407 ks8851_wrreg16(ks, KS_MAHTR3, rxc->mchash[3]);
409 ks8851_wrreg16(ks, KS_RXCR2, rxc->rxcr2);
410 ks8851_wrreg16(ks, KS_RXCR1, rxc->rxcr1);
413 ks8851_unlock(ks, &flags);
415 if (status & IRQ_LCI)
416 mii_check_link(&ks->mii);
418 if (status & IRQ_TXI)
419 netif_wake_queue(ks->netdev);
425 * ks8851_flush_tx_work - flush outstanding TX work
426 * @ks: The device state
428 static void ks8851_flush_tx_work(struct ks8851_net *ks)
430 if (ks->flush_tx_work)
431 ks->flush_tx_work(ks);
435 * ks8851_net_open - open network device
436 * @dev: The network device being opened.
438 * Called when the network device is marked active, such as a user executing
439 * 'ifconfig up' on the device.
441 static int ks8851_net_open(struct net_device *dev)
443 struct ks8851_net *ks = netdev_priv(dev);
447 ret = request_threaded_irq(dev->irq, NULL, ks8851_irq,
448 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
451 netdev_err(dev, "failed to get irq\n");
455 /* lock the card, even if we may not actually be doing anything
456 * else at the moment */
457 ks8851_lock(ks, &flags);
459 netif_dbg(ks, ifup, ks->netdev, "opening\n");
461 /* bring chip out of any power saving mode it was in */
462 ks8851_set_powermode(ks, PMECR_PM_NORMAL);
464 /* issue a soft reset to the RX/TX QMU to put it into a known
466 ks8851_soft_reset(ks, GRR_QMU);
468 /* setup transmission parameters */
470 ks8851_wrreg16(ks, KS_TXCR, (TXCR_TXE | /* enable transmit process */
471 TXCR_TXPE | /* pad to min length */
472 TXCR_TXCRC | /* add CRC */
473 TXCR_TXFCE)); /* enable flow control */
475 /* auto-increment tx data, reset tx pointer */
476 ks8851_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
478 /* setup receiver control */
480 ks8851_wrreg16(ks, KS_RXCR1, (RXCR1_RXPAFMA | /* from mac filter */
481 RXCR1_RXFCE | /* enable flow control */
482 RXCR1_RXBE | /* broadcast enable */
483 RXCR1_RXUE | /* unicast enable */
484 RXCR1_RXE)); /* enable rx block */
486 /* transfer entire frames out in one go */
487 ks8851_wrreg16(ks, KS_RXCR2, RXCR2_SRDBL_FRAME);
489 /* set receive counter timeouts */
490 ks8851_wrreg16(ks, KS_RXDTTR, 1000); /* 1ms after first frame to IRQ */
491 ks8851_wrreg16(ks, KS_RXDBCTR, 4096); /* >4Kbytes in buffer to IRQ */
492 ks8851_wrreg16(ks, KS_RXFCTR, 10); /* 10 frames to IRQ */
494 ks->rc_rxqcr = (RXQCR_RXFCTE | /* IRQ on frame count exceeded */
495 RXQCR_RXDBCTE | /* IRQ on byte count exceeded */
496 RXQCR_RXDTTE); /* IRQ on time exceeded */
498 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr);
500 /* clear then enable interrupts */
501 ks8851_wrreg16(ks, KS_ISR, ks->rc_ier);
502 ks8851_wrreg16(ks, KS_IER, ks->rc_ier);
504 netif_start_queue(ks->netdev);
506 netif_dbg(ks, ifup, ks->netdev, "network device up\n");
508 ks8851_unlock(ks, &flags);
509 mii_check_link(&ks->mii);
514 * ks8851_net_stop - close network device
515 * @dev: The device being closed.
517 * Called to close down a network device which has been active. Cancell any
518 * work, shutdown the RX and TX process and then place the chip into a low
519 * power state whilst it is not being used.
521 static int ks8851_net_stop(struct net_device *dev)
523 struct ks8851_net *ks = netdev_priv(dev);
526 netif_info(ks, ifdown, dev, "shutting down\n");
528 netif_stop_queue(dev);
530 ks8851_lock(ks, &flags);
531 /* turn off the IRQs and ack any outstanding */
532 ks8851_wrreg16(ks, KS_IER, 0x0000);
533 ks8851_wrreg16(ks, KS_ISR, 0xffff);
534 ks8851_unlock(ks, &flags);
536 /* stop any outstanding work */
537 ks8851_flush_tx_work(ks);
538 flush_work(&ks->rxctrl_work);
540 ks8851_lock(ks, &flags);
541 /* shutdown RX process */
542 ks8851_wrreg16(ks, KS_RXCR1, 0x0000);
544 /* shutdown TX process */
545 ks8851_wrreg16(ks, KS_TXCR, 0x0000);
547 /* set powermode to soft power down to save power */
548 ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
549 ks8851_unlock(ks, &flags);
551 /* ensure any queued tx buffers are dumped */
552 while (!skb_queue_empty(&ks->txq)) {
553 struct sk_buff *txb = skb_dequeue(&ks->txq);
555 netif_dbg(ks, ifdown, ks->netdev,
556 "%s: freeing txb %p\n", __func__, txb);
561 free_irq(dev->irq, ks);
567 * ks8851_start_xmit - transmit packet
568 * @skb: The buffer to transmit
569 * @dev: The device used to transmit the packet.
571 * Called by the network layer to transmit the @skb. Queue the packet for
572 * the device and schedule the necessary work to transmit the packet when
575 * We do this to firstly avoid sleeping with the network device locked,
576 * and secondly so we can round up more than one packet to transmit which
577 * means we can try and avoid generating too many transmit done interrupts.
579 static netdev_tx_t ks8851_start_xmit(struct sk_buff *skb,
580 struct net_device *dev)
582 struct ks8851_net *ks = netdev_priv(dev);
584 return ks->start_xmit(skb, dev);
588 * ks8851_rxctrl_work - work handler to change rx mode
589 * @work: The work structure this belongs to.
591 * Lock the device and issue the necessary changes to the receive mode from
592 * the network device layer. This is done so that we can do this without
593 * having to sleep whilst holding the network device lock.
595 * Since the recommendation from Micrel is that the RXQ is shutdown whilst the
596 * receive parameters are programmed, we issue a write to disable the RXQ and
597 * then wait for the interrupt handler to be triggered once the RXQ shutdown is
598 * complete. The interrupt handler then writes the new values into the chip.
600 static void ks8851_rxctrl_work(struct work_struct *work)
602 struct ks8851_net *ks = container_of(work, struct ks8851_net, rxctrl_work);
605 ks8851_lock(ks, &flags);
607 /* need to shutdown RXQ before modifying filter parameters */
608 ks8851_wrreg16(ks, KS_RXCR1, 0x00);
610 ks8851_unlock(ks, &flags);
613 static void ks8851_set_rx_mode(struct net_device *dev)
615 struct ks8851_net *ks = netdev_priv(dev);
616 struct ks8851_rxctrl rxctrl;
618 memset(&rxctrl, 0, sizeof(rxctrl));
620 if (dev->flags & IFF_PROMISC) {
621 /* interface to receive everything */
623 rxctrl.rxcr1 = RXCR1_RXAE | RXCR1_RXINVF;
624 } else if (dev->flags & IFF_ALLMULTI) {
625 /* accept all multicast packets */
627 rxctrl.rxcr1 = (RXCR1_RXME | RXCR1_RXAE |
628 RXCR1_RXPAFMA | RXCR1_RXMAFMA);
629 } else if (dev->flags & IFF_MULTICAST && !netdev_mc_empty(dev)) {
630 struct netdev_hw_addr *ha;
633 /* accept some multicast */
635 netdev_for_each_mc_addr(ha, dev) {
636 crc = ether_crc(ETH_ALEN, ha->addr);
637 crc >>= (32 - 6); /* get top six bits */
639 rxctrl.mchash[crc >> 4] |= (1 << (crc & 0xf));
642 rxctrl.rxcr1 = RXCR1_RXME | RXCR1_RXPAFMA;
644 /* just accept broadcast / unicast */
645 rxctrl.rxcr1 = RXCR1_RXPAFMA;
648 rxctrl.rxcr1 |= (RXCR1_RXUE | /* unicast enable */
649 RXCR1_RXBE | /* broadcast enable */
650 RXCR1_RXE | /* RX process enable */
651 RXCR1_RXFCE); /* enable flow control */
653 rxctrl.rxcr2 |= RXCR2_SRDBL_FRAME;
655 /* schedule work to do the actual set of the data if needed */
657 spin_lock(&ks->statelock);
659 if (memcmp(&rxctrl, &ks->rxctrl, sizeof(rxctrl)) != 0) {
660 memcpy(&ks->rxctrl, &rxctrl, sizeof(ks->rxctrl));
661 schedule_work(&ks->rxctrl_work);
664 spin_unlock(&ks->statelock);
667 static int ks8851_set_mac_address(struct net_device *dev, void *addr)
669 struct sockaddr *sa = addr;
671 if (netif_running(dev))
674 if (!is_valid_ether_addr(sa->sa_data))
675 return -EADDRNOTAVAIL;
677 eth_hw_addr_set(dev, sa->sa_data);
678 return ks8851_write_mac_addr(dev);
681 static int ks8851_net_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
683 struct ks8851_net *ks = netdev_priv(dev);
685 if (!netif_running(dev))
688 return generic_mii_ioctl(&ks->mii, if_mii(req), cmd, NULL);
691 static const struct net_device_ops ks8851_netdev_ops = {
692 .ndo_open = ks8851_net_open,
693 .ndo_stop = ks8851_net_stop,
694 .ndo_eth_ioctl = ks8851_net_ioctl,
695 .ndo_start_xmit = ks8851_start_xmit,
696 .ndo_set_mac_address = ks8851_set_mac_address,
697 .ndo_set_rx_mode = ks8851_set_rx_mode,
698 .ndo_validate_addr = eth_validate_addr,
701 /* ethtool support */
703 static void ks8851_get_drvinfo(struct net_device *dev,
704 struct ethtool_drvinfo *di)
706 strlcpy(di->driver, "KS8851", sizeof(di->driver));
707 strlcpy(di->version, "1.00", sizeof(di->version));
708 strlcpy(di->bus_info, dev_name(dev->dev.parent), sizeof(di->bus_info));
711 static u32 ks8851_get_msglevel(struct net_device *dev)
713 struct ks8851_net *ks = netdev_priv(dev);
714 return ks->msg_enable;
717 static void ks8851_set_msglevel(struct net_device *dev, u32 to)
719 struct ks8851_net *ks = netdev_priv(dev);
723 static int ks8851_get_link_ksettings(struct net_device *dev,
724 struct ethtool_link_ksettings *cmd)
726 struct ks8851_net *ks = netdev_priv(dev);
728 mii_ethtool_get_link_ksettings(&ks->mii, cmd);
733 static int ks8851_set_link_ksettings(struct net_device *dev,
734 const struct ethtool_link_ksettings *cmd)
736 struct ks8851_net *ks = netdev_priv(dev);
737 return mii_ethtool_set_link_ksettings(&ks->mii, cmd);
740 static u32 ks8851_get_link(struct net_device *dev)
742 struct ks8851_net *ks = netdev_priv(dev);
743 return mii_link_ok(&ks->mii);
746 static int ks8851_nway_reset(struct net_device *dev)
748 struct ks8851_net *ks = netdev_priv(dev);
749 return mii_nway_restart(&ks->mii);
754 static void ks8851_eeprom_regread(struct eeprom_93cx6 *ee)
756 struct ks8851_net *ks = ee->data;
759 val = ks8851_rdreg16(ks, KS_EEPCR);
761 ee->reg_data_out = (val & EEPCR_EESB) ? 1 : 0;
762 ee->reg_data_clock = (val & EEPCR_EESCK) ? 1 : 0;
763 ee->reg_chip_select = (val & EEPCR_EECS) ? 1 : 0;
766 static void ks8851_eeprom_regwrite(struct eeprom_93cx6 *ee)
768 struct ks8851_net *ks = ee->data;
769 unsigned val = EEPCR_EESA; /* default - eeprom access on */
775 if (ee->reg_data_clock)
777 if (ee->reg_chip_select)
780 ks8851_wrreg16(ks, KS_EEPCR, val);
784 * ks8851_eeprom_claim - claim device EEPROM and activate the interface
785 * @ks: The network device state.
787 * Check for the presence of an EEPROM, and then activate software access
790 static int ks8851_eeprom_claim(struct ks8851_net *ks)
792 /* start with clock low, cs high */
793 ks8851_wrreg16(ks, KS_EEPCR, EEPCR_EESA | EEPCR_EECS);
798 * ks8851_eeprom_release - release the EEPROM interface
799 * @ks: The device state
801 * Release the software access to the device EEPROM
803 static void ks8851_eeprom_release(struct ks8851_net *ks)
805 unsigned val = ks8851_rdreg16(ks, KS_EEPCR);
807 ks8851_wrreg16(ks, KS_EEPCR, val & ~EEPCR_EESA);
810 #define KS_EEPROM_MAGIC (0x00008851)
812 static int ks8851_set_eeprom(struct net_device *dev,
813 struct ethtool_eeprom *ee, u8 *data)
815 struct ks8851_net *ks = netdev_priv(dev);
816 int offset = ee->offset;
821 /* currently only support byte writing */
825 if (ee->magic != KS_EEPROM_MAGIC)
828 if (!(ks->rc_ccr & CCR_EEPROM))
831 ks8851_lock(ks, &flags);
833 ks8851_eeprom_claim(ks);
835 eeprom_93cx6_wren(&ks->eeprom, true);
837 /* ethtool currently only supports writing bytes, which means
838 * we have to read/modify/write our 16bit EEPROMs */
840 eeprom_93cx6_read(&ks->eeprom, offset/2, &tmp);
850 eeprom_93cx6_write(&ks->eeprom, offset/2, tmp);
851 eeprom_93cx6_wren(&ks->eeprom, false);
853 ks8851_eeprom_release(ks);
854 ks8851_unlock(ks, &flags);
859 static int ks8851_get_eeprom(struct net_device *dev,
860 struct ethtool_eeprom *ee, u8 *data)
862 struct ks8851_net *ks = netdev_priv(dev);
863 int offset = ee->offset;
867 /* must be 2 byte aligned */
868 if (len & 1 || offset & 1)
871 if (!(ks->rc_ccr & CCR_EEPROM))
874 ks8851_lock(ks, &flags);
876 ks8851_eeprom_claim(ks);
878 ee->magic = KS_EEPROM_MAGIC;
880 eeprom_93cx6_multiread(&ks->eeprom, offset/2, (__le16 *)data, len/2);
881 ks8851_eeprom_release(ks);
882 ks8851_unlock(ks, &flags);
887 static int ks8851_get_eeprom_len(struct net_device *dev)
889 struct ks8851_net *ks = netdev_priv(dev);
891 /* currently, we assume it is an 93C46 attached, so return 128 */
892 return ks->rc_ccr & CCR_EEPROM ? 128 : 0;
895 static const struct ethtool_ops ks8851_ethtool_ops = {
896 .get_drvinfo = ks8851_get_drvinfo,
897 .get_msglevel = ks8851_get_msglevel,
898 .set_msglevel = ks8851_set_msglevel,
899 .get_link = ks8851_get_link,
900 .nway_reset = ks8851_nway_reset,
901 .get_eeprom_len = ks8851_get_eeprom_len,
902 .get_eeprom = ks8851_get_eeprom,
903 .set_eeprom = ks8851_set_eeprom,
904 .get_link_ksettings = ks8851_get_link_ksettings,
905 .set_link_ksettings = ks8851_set_link_ksettings,
908 /* MII interface controls */
911 * ks8851_phy_reg - convert MII register into a KS8851 register
912 * @reg: MII register number.
914 * Return the KS8851 register number for the corresponding MII PHY register
915 * if possible. Return zero if the MII register has no direct mapping to the
916 * KS8851 register set.
918 static int ks8851_phy_reg(int reg)
938 static int ks8851_phy_read_common(struct net_device *dev, int phy_addr, int reg)
940 struct ks8851_net *ks = netdev_priv(dev);
945 ksreg = ks8851_phy_reg(reg);
949 ks8851_lock(ks, &flags);
950 result = ks8851_rdreg16(ks, ksreg);
951 ks8851_unlock(ks, &flags);
957 * ks8851_phy_read - MII interface PHY register read.
958 * @dev: The network device the PHY is on.
959 * @phy_addr: Address of PHY (ignored as we only have one)
960 * @reg: The register to read.
962 * This call reads data from the PHY register specified in @reg. Since the
963 * device does not support all the MII registers, the non-existent values
964 * are always returned as zero.
966 * We return zero for unsupported registers as the MII code does not check
967 * the value returned for any error status, and simply returns it to the
968 * caller. The mii-tool that the driver was tested with takes any -ve error
969 * as real PHY capabilities, thus displaying incorrect data to the user.
971 static int ks8851_phy_read(struct net_device *dev, int phy_addr, int reg)
975 ret = ks8851_phy_read_common(dev, phy_addr, reg);
977 return 0x0; /* no error return allowed, so use zero */
982 static void ks8851_phy_write(struct net_device *dev,
983 int phy, int reg, int value)
985 struct ks8851_net *ks = netdev_priv(dev);
989 ksreg = ks8851_phy_reg(reg);
991 ks8851_lock(ks, &flags);
992 ks8851_wrreg16(ks, ksreg, value);
993 ks8851_unlock(ks, &flags);
997 static int ks8851_mdio_read(struct mii_bus *bus, int phy_id, int reg)
999 struct ks8851_net *ks = bus->priv;
1004 /* KS8851 PHY ID registers are swapped in HW, swap them back. */
1005 if (reg == MII_PHYSID1)
1007 else if (reg == MII_PHYSID2)
1010 return ks8851_phy_read_common(ks->netdev, phy_id, reg);
1013 static int ks8851_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
1015 struct ks8851_net *ks = bus->priv;
1017 ks8851_phy_write(ks->netdev, phy_id, reg, val);
1022 * ks8851_read_selftest - read the selftest memory info.
1023 * @ks: The device state
1025 * Read and check the TX/RX memory selftest information.
1027 static void ks8851_read_selftest(struct ks8851_net *ks)
1029 unsigned both_done = MBIR_TXMBF | MBIR_RXMBF;
1032 rd = ks8851_rdreg16(ks, KS_MBIR);
1034 if ((rd & both_done) != both_done) {
1035 netdev_warn(ks->netdev, "Memory selftest not finished\n");
1039 if (rd & MBIR_TXMBFA)
1040 netdev_err(ks->netdev, "TX memory selftest fail\n");
1042 if (rd & MBIR_RXMBFA)
1043 netdev_err(ks->netdev, "RX memory selftest fail\n");
1046 /* driver bus management functions */
1048 #ifdef CONFIG_PM_SLEEP
1050 int ks8851_suspend(struct device *dev)
1052 struct ks8851_net *ks = dev_get_drvdata(dev);
1053 struct net_device *netdev = ks->netdev;
1055 if (netif_running(netdev)) {
1056 netif_device_detach(netdev);
1057 ks8851_net_stop(netdev);
1062 EXPORT_SYMBOL_GPL(ks8851_suspend);
1064 int ks8851_resume(struct device *dev)
1066 struct ks8851_net *ks = dev_get_drvdata(dev);
1067 struct net_device *netdev = ks->netdev;
1069 if (netif_running(netdev)) {
1070 ks8851_net_open(netdev);
1071 netif_device_attach(netdev);
1076 EXPORT_SYMBOL_GPL(ks8851_resume);
1079 static int ks8851_register_mdiobus(struct ks8851_net *ks, struct device *dev)
1081 struct mii_bus *mii_bus;
1084 mii_bus = mdiobus_alloc();
1088 mii_bus->name = "ks8851_eth_mii";
1089 mii_bus->read = ks8851_mdio_read;
1090 mii_bus->write = ks8851_mdio_write;
1092 mii_bus->parent = dev;
1093 mii_bus->phy_mask = ~((u32)BIT(0));
1094 snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(dev));
1096 ret = mdiobus_register(mii_bus);
1098 goto err_mdiobus_register;
1100 ks->mii_bus = mii_bus;
1104 err_mdiobus_register:
1105 mdiobus_free(mii_bus);
1109 static void ks8851_unregister_mdiobus(struct ks8851_net *ks)
1111 mdiobus_unregister(ks->mii_bus);
1112 mdiobus_free(ks->mii_bus);
1115 int ks8851_probe_common(struct net_device *netdev, struct device *dev,
1118 struct ks8851_net *ks = netdev_priv(netdev);
1123 ks->netdev = netdev;
1124 ks->tx_space = 6144;
1126 gpio = of_get_named_gpio_flags(dev->of_node, "reset-gpios", 0, NULL);
1127 if (gpio == -EPROBE_DEFER)
1131 if (gpio_is_valid(gpio)) {
1132 ret = devm_gpio_request_one(dev, gpio,
1133 GPIOF_OUT_INIT_LOW, "ks8851_rst_n");
1135 dev_err(dev, "reset gpio request failed\n");
1140 ks->vdd_io = devm_regulator_get(dev, "vdd-io");
1141 if (IS_ERR(ks->vdd_io)) {
1142 ret = PTR_ERR(ks->vdd_io);
1146 ret = regulator_enable(ks->vdd_io);
1148 dev_err(dev, "regulator vdd_io enable fail: %d\n", ret);
1152 ks->vdd_reg = devm_regulator_get(dev, "vdd");
1153 if (IS_ERR(ks->vdd_reg)) {
1154 ret = PTR_ERR(ks->vdd_reg);
1158 ret = regulator_enable(ks->vdd_reg);
1160 dev_err(dev, "regulator vdd enable fail: %d\n", ret);
1164 if (gpio_is_valid(gpio)) {
1165 usleep_range(10000, 11000);
1166 gpio_set_value(gpio, 1);
1169 spin_lock_init(&ks->statelock);
1171 INIT_WORK(&ks->rxctrl_work, ks8851_rxctrl_work);
1173 SET_NETDEV_DEV(netdev, dev);
1175 /* setup EEPROM state */
1176 ks->eeprom.data = ks;
1177 ks->eeprom.width = PCI_EEPROM_WIDTH_93C46;
1178 ks->eeprom.register_read = ks8851_eeprom_regread;
1179 ks->eeprom.register_write = ks8851_eeprom_regwrite;
1181 /* setup mii state */
1182 ks->mii.dev = netdev;
1184 ks->mii.phy_id_mask = 1;
1185 ks->mii.reg_num_mask = 0xf;
1186 ks->mii.mdio_read = ks8851_phy_read;
1187 ks->mii.mdio_write = ks8851_phy_write;
1189 dev_info(dev, "message enable is %d\n", msg_en);
1191 ret = ks8851_register_mdiobus(ks, dev);
1195 /* set the default message enable */
1196 ks->msg_enable = netif_msg_init(msg_en, NETIF_MSG_DRV |
1200 skb_queue_head_init(&ks->txq);
1202 netdev->ethtool_ops = &ks8851_ethtool_ops;
1204 dev_set_drvdata(dev, ks);
1206 netif_carrier_off(ks->netdev);
1207 netdev->if_port = IF_PORT_100BASET;
1208 netdev->netdev_ops = &ks8851_netdev_ops;
1210 /* issue a global soft reset to reset the device. */
1211 ks8851_soft_reset(ks, GRR_GSR);
1213 /* simple check for a valid chip being connected to the bus */
1214 cider = ks8851_rdreg16(ks, KS_CIDER);
1215 if ((cider & ~CIDER_REV_MASK) != CIDER_ID) {
1216 dev_err(dev, "failed to read device ID\n");
1221 /* cache the contents of the CCR register for EEPROM, etc. */
1222 ks->rc_ccr = ks8851_rdreg16(ks, KS_CCR);
1224 ks8851_read_selftest(ks);
1225 ks8851_init_mac(ks, dev->of_node);
1227 ret = register_netdev(netdev);
1229 dev_err(dev, "failed to register network device\n");
1233 netdev_info(netdev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
1234 CIDER_REV_GET(cider), netdev->dev_addr, netdev->irq,
1235 ks->rc_ccr & CCR_EEPROM ? "has" : "no");
1240 ks8851_unregister_mdiobus(ks);
1242 if (gpio_is_valid(gpio))
1243 gpio_set_value(gpio, 0);
1244 regulator_disable(ks->vdd_reg);
1246 regulator_disable(ks->vdd_io);
1250 EXPORT_SYMBOL_GPL(ks8851_probe_common);
1252 void ks8851_remove_common(struct device *dev)
1254 struct ks8851_net *priv = dev_get_drvdata(dev);
1256 ks8851_unregister_mdiobus(priv);
1258 if (netif_msg_drv(priv))
1259 dev_info(dev, "remove\n");
1261 unregister_netdev(priv->netdev);
1262 if (gpio_is_valid(priv->gpio))
1263 gpio_set_value(priv->gpio, 0);
1264 regulator_disable(priv->vdd_reg);
1265 regulator_disable(priv->vdd_io);
1267 EXPORT_SYMBOL_GPL(ks8851_remove_common);
1269 MODULE_DESCRIPTION("KS8851 Network driver");
1271 MODULE_LICENSE("GPL");