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/gpio/consumer.h>
21 #include <linux/regulator/consumer.h>
23 #include <linux/of_mdio.h>
24 #include <linux/of_net.h>
29 * ks8851_lock - register access lock
31 * @flags: Spinlock flags
33 * Claim chip register access lock
35 static void ks8851_lock(struct ks8851_net *ks, unsigned long *flags)
41 * ks8851_unlock - register access unlock
43 * @flags: Spinlock flags
45 * Release chip register access lock
47 static void ks8851_unlock(struct ks8851_net *ks, unsigned long *flags)
49 ks->unlock(ks, flags);
53 * ks8851_wrreg16 - write 16bit register value to chip
55 * @reg: The register address
56 * @val: The value to write
58 * Issue a write to put the value @val into the register specified in @reg.
60 static void ks8851_wrreg16(struct ks8851_net *ks, unsigned int reg,
63 ks->wrreg16(ks, reg, val);
67 * ks8851_rdreg16 - read 16 bit register from device
68 * @ks: The chip information
69 * @reg: The register address
71 * Read a 16bit register from the chip, returning the result
73 static unsigned int ks8851_rdreg16(struct ks8851_net *ks,
76 return ks->rdreg16(ks, reg);
80 * ks8851_soft_reset - issue one of the soft reset to the device
81 * @ks: The device state.
82 * @op: The bit(s) to set in the GRR
84 * Issue the relevant soft-reset command to the device's GRR register
87 * Note, the delays are in there as a caution to ensure that the reset
88 * has time to take effect and then complete. Since the datasheet does
89 * not currently specify the exact sequence, we have chosen something
90 * that seems to work with our device.
92 static void ks8851_soft_reset(struct ks8851_net *ks, unsigned op)
94 ks8851_wrreg16(ks, KS_GRR, op);
95 mdelay(1); /* wait a short time to effect reset */
96 ks8851_wrreg16(ks, KS_GRR, 0);
97 mdelay(1); /* wait for condition to clear */
101 * ks8851_set_powermode - set power mode of the device
102 * @ks: The device state
103 * @pwrmode: The power mode value to write to KS_PMECR.
105 * Change the power mode of the chip.
107 static void ks8851_set_powermode(struct ks8851_net *ks, unsigned pwrmode)
111 netif_dbg(ks, hw, ks->netdev, "setting power mode %d\n", pwrmode);
113 pmecr = ks8851_rdreg16(ks, KS_PMECR);
114 pmecr &= ~PMECR_PM_MASK;
117 ks8851_wrreg16(ks, KS_PMECR, pmecr);
121 * ks8851_write_mac_addr - write mac address to device registers
122 * @dev: The network device
124 * Update the KS8851 MAC address registers from the address in @dev.
126 * This call assumes that the chip is not running, so there is no need to
127 * shutdown the RXQ process whilst setting this.
129 static int ks8851_write_mac_addr(struct net_device *dev)
131 struct ks8851_net *ks = netdev_priv(dev);
136 ks8851_lock(ks, &flags);
139 * Wake up chip in case it was powered off when stopped; otherwise,
140 * the first write to the MAC address does not take effect.
142 ks8851_set_powermode(ks, PMECR_PM_NORMAL);
144 for (i = 0; i < ETH_ALEN; i += 2) {
145 val = (dev->dev_addr[i] << 8) | dev->dev_addr[i + 1];
146 ks8851_wrreg16(ks, KS_MAR(i), val);
149 if (!netif_running(dev))
150 ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
152 ks8851_unlock(ks, &flags);
158 * ks8851_read_mac_addr - read mac address from device registers
159 * @dev: The network device
161 * Update our copy of the KS8851 MAC address from the registers of @dev.
163 static void ks8851_read_mac_addr(struct net_device *dev)
165 struct ks8851_net *ks = netdev_priv(dev);
171 ks8851_lock(ks, &flags);
173 for (i = 0; i < ETH_ALEN; i += 2) {
174 reg = ks8851_rdreg16(ks, KS_MAR(i));
176 addr[i + 1] = reg & 0xff;
178 eth_hw_addr_set(dev, addr);
180 ks8851_unlock(ks, &flags);
184 * ks8851_init_mac - initialise the mac address
185 * @ks: The device structure
186 * @np: The device node pointer
188 * Get or create the initial mac address for the device and then set that
189 * into the station address register. A mac address supplied in the device
190 * tree takes precedence. Otherwise, if there is an EEPROM present, then
191 * we try that. If no valid mac address is found we use eth_random_addr()
192 * to create a new one.
194 static void ks8851_init_mac(struct ks8851_net *ks, struct device_node *np)
196 struct net_device *dev = ks->netdev;
199 ret = of_get_ethdev_address(np, dev);
201 ks8851_write_mac_addr(dev);
205 if (ks->rc_ccr & CCR_EEPROM) {
206 ks8851_read_mac_addr(dev);
207 if (is_valid_ether_addr(dev->dev_addr))
210 netdev_err(ks->netdev, "invalid mac address read %pM\n",
214 eth_hw_addr_random(dev);
215 ks8851_write_mac_addr(dev);
219 * ks8851_dbg_dumpkkt - dump initial packet contents to debug
220 * @ks: The device state
221 * @rxpkt: The data for the received packet
223 * Dump the initial data from the packet to dev_dbg().
225 static void ks8851_dbg_dumpkkt(struct ks8851_net *ks, u8 *rxpkt)
227 netdev_dbg(ks->netdev,
228 "pkt %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x\n",
229 rxpkt[4], rxpkt[5], rxpkt[6], rxpkt[7],
230 rxpkt[8], rxpkt[9], rxpkt[10], rxpkt[11],
231 rxpkt[12], rxpkt[13], rxpkt[14], rxpkt[15]);
235 * ks8851_rx_skb - receive skbuff
236 * @ks: The device state.
239 static void ks8851_rx_skb(struct ks8851_net *ks, struct sk_buff *skb)
245 * ks8851_rx_pkts - receive packets from the host
246 * @ks: The device information.
248 * This is called from the IRQ work queue when the system detects that there
249 * are packets in the receive queue. Find out how many packets there are and
250 * read them from the FIFO.
252 static void ks8851_rx_pkts(struct ks8851_net *ks)
260 rxfc = (ks8851_rdreg16(ks, KS_RXFCTR) >> 8) & 0xff;
262 netif_dbg(ks, rx_status, ks->netdev,
263 "%s: %d packets\n", __func__, rxfc);
265 /* Currently we're issuing a read per packet, but we could possibly
266 * improve the code by issuing a single read, getting the receive
267 * header, allocating the packet and then reading the packet data
270 * This form of operation would require us to hold the SPI bus'
271 * chipselect low during the entie transaction to avoid any
272 * reset to the data stream coming from the chip.
275 for (; rxfc != 0; rxfc--) {
276 rxstat = ks8851_rdreg16(ks, KS_RXFHSR);
277 rxlen = ks8851_rdreg16(ks, KS_RXFHBCR) & RXFHBCR_CNT_MASK;
279 netif_dbg(ks, rx_status, ks->netdev,
280 "rx: stat 0x%04x, len 0x%04x\n", rxstat, rxlen);
282 /* the length of the packet includes the 32bit CRC */
284 /* set dma read address */
285 ks8851_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI | 0x00);
287 /* start DMA access */
288 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA);
291 unsigned int rxalign;
294 rxalign = ALIGN(rxlen, 4);
295 skb = netdev_alloc_skb_ip_align(ks->netdev, rxalign);
298 /* 4 bytes of status header + 4 bytes of
299 * garbage: we put them before ethernet
300 * header, so that they are copied,
304 rxpkt = skb_put(skb, rxlen) - 8;
306 ks->rdfifo(ks, rxpkt, rxalign + 8);
308 if (netif_msg_pktdata(ks))
309 ks8851_dbg_dumpkkt(ks, rxpkt);
311 skb->protocol = eth_type_trans(skb, ks->netdev);
312 ks8851_rx_skb(ks, skb);
314 ks->netdev->stats.rx_packets++;
315 ks->netdev->stats.rx_bytes += rxlen;
319 /* end DMA access and dequeue packet */
320 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_RRXEF);
325 * ks8851_irq - IRQ handler for dealing with interrupt requests
329 * This handler is invoked when the IRQ line asserts to find out what happened.
330 * As we cannot allow ourselves to sleep in HARDIRQ context, this handler runs
333 * Read the interrupt status, work out what needs to be done and then clear
334 * any of the interrupts that are not needed.
336 static irqreturn_t ks8851_irq(int irq, void *_ks)
338 struct ks8851_net *ks = _ks;
339 unsigned handled = 0;
343 ks8851_lock(ks, &flags);
345 status = ks8851_rdreg16(ks, KS_ISR);
347 netif_dbg(ks, intr, ks->netdev,
348 "%s: status 0x%04x\n", __func__, status);
350 if (status & IRQ_LCI)
353 if (status & IRQ_LDI) {
354 u16 pmecr = ks8851_rdreg16(ks, KS_PMECR);
355 pmecr &= ~PMECR_WKEVT_MASK;
356 ks8851_wrreg16(ks, KS_PMECR, pmecr | PMECR_WKEVT_LINK);
361 if (status & IRQ_RXPSI)
362 handled |= IRQ_RXPSI;
364 if (status & IRQ_TXI) {
367 /* no lock here, tx queue should have been stopped */
369 /* update our idea of how much tx space is available to the
371 ks->tx_space = ks8851_rdreg16(ks, KS_TXMIR);
373 netif_dbg(ks, intr, ks->netdev,
374 "%s: txspace %d\n", __func__, ks->tx_space);
377 if (status & IRQ_RXI)
380 if (status & IRQ_SPIBEI) {
381 netdev_err(ks->netdev, "%s: spi bus error\n", __func__);
382 handled |= IRQ_SPIBEI;
385 ks8851_wrreg16(ks, KS_ISR, handled);
387 if (status & IRQ_RXI) {
388 /* the datasheet says to disable the rx interrupt during
389 * packet read-out, however we're masking the interrupt
390 * from the device so do not bother masking just the RX
391 * from the device. */
396 /* if something stopped the rx process, probably due to wanting
397 * to change the rx settings, then do something about restarting
399 if (status & IRQ_RXPSI) {
400 struct ks8851_rxctrl *rxc = &ks->rxctrl;
402 /* update the multicast hash table */
403 ks8851_wrreg16(ks, KS_MAHTR0, rxc->mchash[0]);
404 ks8851_wrreg16(ks, KS_MAHTR1, rxc->mchash[1]);
405 ks8851_wrreg16(ks, KS_MAHTR2, rxc->mchash[2]);
406 ks8851_wrreg16(ks, KS_MAHTR3, rxc->mchash[3]);
408 ks8851_wrreg16(ks, KS_RXCR2, rxc->rxcr2);
409 ks8851_wrreg16(ks, KS_RXCR1, rxc->rxcr1);
412 ks8851_unlock(ks, &flags);
414 if (status & IRQ_LCI)
415 mii_check_link(&ks->mii);
417 if (status & IRQ_TXI)
418 netif_wake_queue(ks->netdev);
424 * ks8851_flush_tx_work - flush outstanding TX work
425 * @ks: The device state
427 static void ks8851_flush_tx_work(struct ks8851_net *ks)
429 if (ks->flush_tx_work)
430 ks->flush_tx_work(ks);
434 * ks8851_net_open - open network device
435 * @dev: The network device being opened.
437 * Called when the network device is marked active, such as a user executing
438 * 'ifconfig up' on the device.
440 static int ks8851_net_open(struct net_device *dev)
442 struct ks8851_net *ks = netdev_priv(dev);
446 ret = request_threaded_irq(dev->irq, NULL, ks8851_irq,
447 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
450 netdev_err(dev, "failed to get irq\n");
454 /* lock the card, even if we may not actually be doing anything
455 * else at the moment */
456 ks8851_lock(ks, &flags);
458 netif_dbg(ks, ifup, ks->netdev, "opening\n");
460 /* bring chip out of any power saving mode it was in */
461 ks8851_set_powermode(ks, PMECR_PM_NORMAL);
463 /* issue a soft reset to the RX/TX QMU to put it into a known
465 ks8851_soft_reset(ks, GRR_QMU);
467 /* setup transmission parameters */
469 ks8851_wrreg16(ks, KS_TXCR, (TXCR_TXE | /* enable transmit process */
470 TXCR_TXPE | /* pad to min length */
471 TXCR_TXCRC | /* add CRC */
472 TXCR_TXFCE)); /* enable flow control */
474 /* auto-increment tx data, reset tx pointer */
475 ks8851_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
477 /* setup receiver control */
479 ks8851_wrreg16(ks, KS_RXCR1, (RXCR1_RXPAFMA | /* from mac filter */
480 RXCR1_RXFCE | /* enable flow control */
481 RXCR1_RXBE | /* broadcast enable */
482 RXCR1_RXUE | /* unicast enable */
483 RXCR1_RXE)); /* enable rx block */
485 /* transfer entire frames out in one go */
486 ks8851_wrreg16(ks, KS_RXCR2, RXCR2_SRDBL_FRAME);
488 /* set receive counter timeouts */
489 ks8851_wrreg16(ks, KS_RXDTTR, 1000); /* 1ms after first frame to IRQ */
490 ks8851_wrreg16(ks, KS_RXDBCTR, 4096); /* >4Kbytes in buffer to IRQ */
491 ks8851_wrreg16(ks, KS_RXFCTR, 10); /* 10 frames to IRQ */
493 ks->rc_rxqcr = (RXQCR_RXFCTE | /* IRQ on frame count exceeded */
494 RXQCR_RXDBCTE | /* IRQ on byte count exceeded */
495 RXQCR_RXDTTE); /* IRQ on time exceeded */
497 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr);
499 /* clear then enable interrupts */
500 ks8851_wrreg16(ks, KS_ISR, ks->rc_ier);
501 ks8851_wrreg16(ks, KS_IER, ks->rc_ier);
503 netif_start_queue(ks->netdev);
505 netif_dbg(ks, ifup, ks->netdev, "network device up\n");
507 ks8851_unlock(ks, &flags);
508 mii_check_link(&ks->mii);
513 * ks8851_net_stop - close network device
514 * @dev: The device being closed.
516 * Called to close down a network device which has been active. Cancell any
517 * work, shutdown the RX and TX process and then place the chip into a low
518 * power state whilst it is not being used.
520 static int ks8851_net_stop(struct net_device *dev)
522 struct ks8851_net *ks = netdev_priv(dev);
525 netif_info(ks, ifdown, dev, "shutting down\n");
527 netif_stop_queue(dev);
529 ks8851_lock(ks, &flags);
530 /* turn off the IRQs and ack any outstanding */
531 ks8851_wrreg16(ks, KS_IER, 0x0000);
532 ks8851_wrreg16(ks, KS_ISR, 0xffff);
533 ks8851_unlock(ks, &flags);
535 /* stop any outstanding work */
536 ks8851_flush_tx_work(ks);
537 flush_work(&ks->rxctrl_work);
539 ks8851_lock(ks, &flags);
540 /* shutdown RX process */
541 ks8851_wrreg16(ks, KS_RXCR1, 0x0000);
543 /* shutdown TX process */
544 ks8851_wrreg16(ks, KS_TXCR, 0x0000);
546 /* set powermode to soft power down to save power */
547 ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
548 ks8851_unlock(ks, &flags);
550 /* ensure any queued tx buffers are dumped */
551 while (!skb_queue_empty(&ks->txq)) {
552 struct sk_buff *txb = skb_dequeue(&ks->txq);
554 netif_dbg(ks, ifdown, ks->netdev,
555 "%s: freeing txb %p\n", __func__, txb);
560 free_irq(dev->irq, ks);
566 * ks8851_start_xmit - transmit packet
567 * @skb: The buffer to transmit
568 * @dev: The device used to transmit the packet.
570 * Called by the network layer to transmit the @skb. Queue the packet for
571 * the device and schedule the necessary work to transmit the packet when
574 * We do this to firstly avoid sleeping with the network device locked,
575 * and secondly so we can round up more than one packet to transmit which
576 * means we can try and avoid generating too many transmit done interrupts.
578 static netdev_tx_t ks8851_start_xmit(struct sk_buff *skb,
579 struct net_device *dev)
581 struct ks8851_net *ks = netdev_priv(dev);
583 return ks->start_xmit(skb, dev);
587 * ks8851_rxctrl_work - work handler to change rx mode
588 * @work: The work structure this belongs to.
590 * Lock the device and issue the necessary changes to the receive mode from
591 * the network device layer. This is done so that we can do this without
592 * having to sleep whilst holding the network device lock.
594 * Since the recommendation from Micrel is that the RXQ is shutdown whilst the
595 * receive parameters are programmed, we issue a write to disable the RXQ and
596 * then wait for the interrupt handler to be triggered once the RXQ shutdown is
597 * complete. The interrupt handler then writes the new values into the chip.
599 static void ks8851_rxctrl_work(struct work_struct *work)
601 struct ks8851_net *ks = container_of(work, struct ks8851_net, rxctrl_work);
604 ks8851_lock(ks, &flags);
606 /* need to shutdown RXQ before modifying filter parameters */
607 ks8851_wrreg16(ks, KS_RXCR1, 0x00);
609 ks8851_unlock(ks, &flags);
612 static void ks8851_set_rx_mode(struct net_device *dev)
614 struct ks8851_net *ks = netdev_priv(dev);
615 struct ks8851_rxctrl rxctrl;
617 memset(&rxctrl, 0, sizeof(rxctrl));
619 if (dev->flags & IFF_PROMISC) {
620 /* interface to receive everything */
622 rxctrl.rxcr1 = RXCR1_RXAE | RXCR1_RXINVF;
623 } else if (dev->flags & IFF_ALLMULTI) {
624 /* accept all multicast packets */
626 rxctrl.rxcr1 = (RXCR1_RXME | RXCR1_RXAE |
627 RXCR1_RXPAFMA | RXCR1_RXMAFMA);
628 } else if (dev->flags & IFF_MULTICAST && !netdev_mc_empty(dev)) {
629 struct netdev_hw_addr *ha;
632 /* accept some multicast */
634 netdev_for_each_mc_addr(ha, dev) {
635 crc = ether_crc(ETH_ALEN, ha->addr);
636 crc >>= (32 - 6); /* get top six bits */
638 rxctrl.mchash[crc >> 4] |= (1 << (crc & 0xf));
641 rxctrl.rxcr1 = RXCR1_RXME | RXCR1_RXPAFMA;
643 /* just accept broadcast / unicast */
644 rxctrl.rxcr1 = RXCR1_RXPAFMA;
647 rxctrl.rxcr1 |= (RXCR1_RXUE | /* unicast enable */
648 RXCR1_RXBE | /* broadcast enable */
649 RXCR1_RXE | /* RX process enable */
650 RXCR1_RXFCE); /* enable flow control */
652 rxctrl.rxcr2 |= RXCR2_SRDBL_FRAME;
654 /* schedule work to do the actual set of the data if needed */
656 spin_lock(&ks->statelock);
658 if (memcmp(&rxctrl, &ks->rxctrl, sizeof(rxctrl)) != 0) {
659 memcpy(&ks->rxctrl, &rxctrl, sizeof(ks->rxctrl));
660 schedule_work(&ks->rxctrl_work);
663 spin_unlock(&ks->statelock);
666 static int ks8851_set_mac_address(struct net_device *dev, void *addr)
668 struct sockaddr *sa = addr;
670 if (netif_running(dev))
673 if (!is_valid_ether_addr(sa->sa_data))
674 return -EADDRNOTAVAIL;
676 eth_hw_addr_set(dev, sa->sa_data);
677 return ks8851_write_mac_addr(dev);
680 static int ks8851_net_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
682 struct ks8851_net *ks = netdev_priv(dev);
684 if (!netif_running(dev))
687 return generic_mii_ioctl(&ks->mii, if_mii(req), cmd, NULL);
690 static const struct net_device_ops ks8851_netdev_ops = {
691 .ndo_open = ks8851_net_open,
692 .ndo_stop = ks8851_net_stop,
693 .ndo_eth_ioctl = ks8851_net_ioctl,
694 .ndo_start_xmit = ks8851_start_xmit,
695 .ndo_set_mac_address = ks8851_set_mac_address,
696 .ndo_set_rx_mode = ks8851_set_rx_mode,
697 .ndo_validate_addr = eth_validate_addr,
700 /* ethtool support */
702 static void ks8851_get_drvinfo(struct net_device *dev,
703 struct ethtool_drvinfo *di)
705 strscpy(di->driver, "KS8851", sizeof(di->driver));
706 strscpy(di->version, "1.00", sizeof(di->version));
707 strscpy(di->bus_info, dev_name(dev->dev.parent), sizeof(di->bus_info));
710 static u32 ks8851_get_msglevel(struct net_device *dev)
712 struct ks8851_net *ks = netdev_priv(dev);
713 return ks->msg_enable;
716 static void ks8851_set_msglevel(struct net_device *dev, u32 to)
718 struct ks8851_net *ks = netdev_priv(dev);
722 static int ks8851_get_link_ksettings(struct net_device *dev,
723 struct ethtool_link_ksettings *cmd)
725 struct ks8851_net *ks = netdev_priv(dev);
727 mii_ethtool_get_link_ksettings(&ks->mii, cmd);
732 static int ks8851_set_link_ksettings(struct net_device *dev,
733 const struct ethtool_link_ksettings *cmd)
735 struct ks8851_net *ks = netdev_priv(dev);
736 return mii_ethtool_set_link_ksettings(&ks->mii, cmd);
739 static u32 ks8851_get_link(struct net_device *dev)
741 struct ks8851_net *ks = netdev_priv(dev);
742 return mii_link_ok(&ks->mii);
745 static int ks8851_nway_reset(struct net_device *dev)
747 struct ks8851_net *ks = netdev_priv(dev);
748 return mii_nway_restart(&ks->mii);
753 static void ks8851_eeprom_regread(struct eeprom_93cx6 *ee)
755 struct ks8851_net *ks = ee->data;
758 val = ks8851_rdreg16(ks, KS_EEPCR);
760 ee->reg_data_out = (val & EEPCR_EESB) ? 1 : 0;
761 ee->reg_data_clock = (val & EEPCR_EESCK) ? 1 : 0;
762 ee->reg_chip_select = (val & EEPCR_EECS) ? 1 : 0;
765 static void ks8851_eeprom_regwrite(struct eeprom_93cx6 *ee)
767 struct ks8851_net *ks = ee->data;
768 unsigned val = EEPCR_EESA; /* default - eeprom access on */
774 if (ee->reg_data_clock)
776 if (ee->reg_chip_select)
779 ks8851_wrreg16(ks, KS_EEPCR, val);
783 * ks8851_eeprom_claim - claim device EEPROM and activate the interface
784 * @ks: The network device state.
786 * Check for the presence of an EEPROM, and then activate software access
789 static int ks8851_eeprom_claim(struct ks8851_net *ks)
791 /* start with clock low, cs high */
792 ks8851_wrreg16(ks, KS_EEPCR, EEPCR_EESA | EEPCR_EECS);
797 * ks8851_eeprom_release - release the EEPROM interface
798 * @ks: The device state
800 * Release the software access to the device EEPROM
802 static void ks8851_eeprom_release(struct ks8851_net *ks)
804 unsigned val = ks8851_rdreg16(ks, KS_EEPCR);
806 ks8851_wrreg16(ks, KS_EEPCR, val & ~EEPCR_EESA);
809 #define KS_EEPROM_MAGIC (0x00008851)
811 static int ks8851_set_eeprom(struct net_device *dev,
812 struct ethtool_eeprom *ee, u8 *data)
814 struct ks8851_net *ks = netdev_priv(dev);
815 int offset = ee->offset;
820 /* currently only support byte writing */
824 if (ee->magic != KS_EEPROM_MAGIC)
827 if (!(ks->rc_ccr & CCR_EEPROM))
830 ks8851_lock(ks, &flags);
832 ks8851_eeprom_claim(ks);
834 eeprom_93cx6_wren(&ks->eeprom, true);
836 /* ethtool currently only supports writing bytes, which means
837 * we have to read/modify/write our 16bit EEPROMs */
839 eeprom_93cx6_read(&ks->eeprom, offset/2, &tmp);
849 eeprom_93cx6_write(&ks->eeprom, offset/2, tmp);
850 eeprom_93cx6_wren(&ks->eeprom, false);
852 ks8851_eeprom_release(ks);
853 ks8851_unlock(ks, &flags);
858 static int ks8851_get_eeprom(struct net_device *dev,
859 struct ethtool_eeprom *ee, u8 *data)
861 struct ks8851_net *ks = netdev_priv(dev);
862 int offset = ee->offset;
866 /* must be 2 byte aligned */
867 if (len & 1 || offset & 1)
870 if (!(ks->rc_ccr & CCR_EEPROM))
873 ks8851_lock(ks, &flags);
875 ks8851_eeprom_claim(ks);
877 ee->magic = KS_EEPROM_MAGIC;
879 eeprom_93cx6_multiread(&ks->eeprom, offset/2, (__le16 *)data, len/2);
880 ks8851_eeprom_release(ks);
881 ks8851_unlock(ks, &flags);
886 static int ks8851_get_eeprom_len(struct net_device *dev)
888 struct ks8851_net *ks = netdev_priv(dev);
890 /* currently, we assume it is an 93C46 attached, so return 128 */
891 return ks->rc_ccr & CCR_EEPROM ? 128 : 0;
894 static const struct ethtool_ops ks8851_ethtool_ops = {
895 .get_drvinfo = ks8851_get_drvinfo,
896 .get_msglevel = ks8851_get_msglevel,
897 .set_msglevel = ks8851_set_msglevel,
898 .get_link = ks8851_get_link,
899 .nway_reset = ks8851_nway_reset,
900 .get_eeprom_len = ks8851_get_eeprom_len,
901 .get_eeprom = ks8851_get_eeprom,
902 .set_eeprom = ks8851_set_eeprom,
903 .get_link_ksettings = ks8851_get_link_ksettings,
904 .set_link_ksettings = ks8851_set_link_ksettings,
907 /* MII interface controls */
910 * ks8851_phy_reg - convert MII register into a KS8851 register
911 * @reg: MII register number.
913 * Return the KS8851 register number for the corresponding MII PHY register
914 * if possible. Return zero if the MII register has no direct mapping to the
915 * KS8851 register set.
917 static int ks8851_phy_reg(int reg)
937 static int ks8851_phy_read_common(struct net_device *dev, int phy_addr, int reg)
939 struct ks8851_net *ks = netdev_priv(dev);
944 ksreg = ks8851_phy_reg(reg);
948 ks8851_lock(ks, &flags);
949 result = ks8851_rdreg16(ks, ksreg);
950 ks8851_unlock(ks, &flags);
956 * ks8851_phy_read - MII interface PHY register read.
957 * @dev: The network device the PHY is on.
958 * @phy_addr: Address of PHY (ignored as we only have one)
959 * @reg: The register to read.
961 * This call reads data from the PHY register specified in @reg. Since the
962 * device does not support all the MII registers, the non-existent values
963 * are always returned as zero.
965 * We return zero for unsupported registers as the MII code does not check
966 * the value returned for any error status, and simply returns it to the
967 * caller. The mii-tool that the driver was tested with takes any -ve error
968 * as real PHY capabilities, thus displaying incorrect data to the user.
970 static int ks8851_phy_read(struct net_device *dev, int phy_addr, int reg)
974 ret = ks8851_phy_read_common(dev, phy_addr, reg);
976 return 0x0; /* no error return allowed, so use zero */
981 static void ks8851_phy_write(struct net_device *dev,
982 int phy, int reg, int value)
984 struct ks8851_net *ks = netdev_priv(dev);
988 ksreg = ks8851_phy_reg(reg);
990 ks8851_lock(ks, &flags);
991 ks8851_wrreg16(ks, ksreg, value);
992 ks8851_unlock(ks, &flags);
996 static int ks8851_mdio_read(struct mii_bus *bus, int phy_id, int reg)
998 struct ks8851_net *ks = bus->priv;
1003 /* KS8851 PHY ID registers are swapped in HW, swap them back. */
1004 if (reg == MII_PHYSID1)
1006 else if (reg == MII_PHYSID2)
1009 return ks8851_phy_read_common(ks->netdev, phy_id, reg);
1012 static int ks8851_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
1014 struct ks8851_net *ks = bus->priv;
1016 ks8851_phy_write(ks->netdev, phy_id, reg, val);
1021 * ks8851_read_selftest - read the selftest memory info.
1022 * @ks: The device state
1024 * Read and check the TX/RX memory selftest information.
1026 static void ks8851_read_selftest(struct ks8851_net *ks)
1028 unsigned both_done = MBIR_TXMBF | MBIR_RXMBF;
1031 rd = ks8851_rdreg16(ks, KS_MBIR);
1033 if ((rd & both_done) != both_done) {
1034 netdev_warn(ks->netdev, "Memory selftest not finished\n");
1038 if (rd & MBIR_TXMBFA)
1039 netdev_err(ks->netdev, "TX memory selftest fail\n");
1041 if (rd & MBIR_RXMBFA)
1042 netdev_err(ks->netdev, "RX memory selftest fail\n");
1045 /* driver bus management functions */
1047 #ifdef CONFIG_PM_SLEEP
1049 int ks8851_suspend(struct device *dev)
1051 struct ks8851_net *ks = dev_get_drvdata(dev);
1052 struct net_device *netdev = ks->netdev;
1054 if (netif_running(netdev)) {
1055 netif_device_detach(netdev);
1056 ks8851_net_stop(netdev);
1061 EXPORT_SYMBOL_GPL(ks8851_suspend);
1063 int ks8851_resume(struct device *dev)
1065 struct ks8851_net *ks = dev_get_drvdata(dev);
1066 struct net_device *netdev = ks->netdev;
1068 if (netif_running(netdev)) {
1069 ks8851_net_open(netdev);
1070 netif_device_attach(netdev);
1075 EXPORT_SYMBOL_GPL(ks8851_resume);
1078 static int ks8851_register_mdiobus(struct ks8851_net *ks, struct device *dev)
1080 struct mii_bus *mii_bus;
1083 mii_bus = mdiobus_alloc();
1087 mii_bus->name = "ks8851_eth_mii";
1088 mii_bus->read = ks8851_mdio_read;
1089 mii_bus->write = ks8851_mdio_write;
1091 mii_bus->parent = dev;
1092 mii_bus->phy_mask = ~((u32)BIT(0));
1093 snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(dev));
1095 ret = mdiobus_register(mii_bus);
1097 goto err_mdiobus_register;
1099 ks->mii_bus = mii_bus;
1103 err_mdiobus_register:
1104 mdiobus_free(mii_bus);
1108 static void ks8851_unregister_mdiobus(struct ks8851_net *ks)
1110 mdiobus_unregister(ks->mii_bus);
1111 mdiobus_free(ks->mii_bus);
1114 int ks8851_probe_common(struct net_device *netdev, struct device *dev,
1117 struct ks8851_net *ks = netdev_priv(netdev);
1121 ks->netdev = netdev;
1122 ks->tx_space = 6144;
1124 ks->gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
1125 ret = PTR_ERR_OR_ZERO(ks->gpio);
1127 if (ret != -EPROBE_DEFER)
1128 dev_err(dev, "reset gpio request failed: %d\n", ret);
1132 ret = gpiod_set_consumer_name(ks->gpio, "ks8851_rst_n");
1134 dev_err(dev, "failed to set reset gpio name: %d\n", ret);
1138 ks->vdd_io = devm_regulator_get(dev, "vdd-io");
1139 if (IS_ERR(ks->vdd_io)) {
1140 ret = PTR_ERR(ks->vdd_io);
1144 ret = regulator_enable(ks->vdd_io);
1146 dev_err(dev, "regulator vdd_io enable fail: %d\n", ret);
1150 ks->vdd_reg = devm_regulator_get(dev, "vdd");
1151 if (IS_ERR(ks->vdd_reg)) {
1152 ret = PTR_ERR(ks->vdd_reg);
1156 ret = regulator_enable(ks->vdd_reg);
1158 dev_err(dev, "regulator vdd enable fail: %d\n", ret);
1163 usleep_range(10000, 11000);
1164 gpiod_set_value_cansleep(ks->gpio, 0);
1167 spin_lock_init(&ks->statelock);
1169 INIT_WORK(&ks->rxctrl_work, ks8851_rxctrl_work);
1171 SET_NETDEV_DEV(netdev, dev);
1173 /* setup EEPROM state */
1174 ks->eeprom.data = ks;
1175 ks->eeprom.width = PCI_EEPROM_WIDTH_93C46;
1176 ks->eeprom.register_read = ks8851_eeprom_regread;
1177 ks->eeprom.register_write = ks8851_eeprom_regwrite;
1179 /* setup mii state */
1180 ks->mii.dev = netdev;
1182 ks->mii.phy_id_mask = 1;
1183 ks->mii.reg_num_mask = 0xf;
1184 ks->mii.mdio_read = ks8851_phy_read;
1185 ks->mii.mdio_write = ks8851_phy_write;
1187 dev_info(dev, "message enable is %d\n", msg_en);
1189 ret = ks8851_register_mdiobus(ks, dev);
1193 /* set the default message enable */
1194 ks->msg_enable = netif_msg_init(msg_en, NETIF_MSG_DRV |
1198 skb_queue_head_init(&ks->txq);
1200 netdev->ethtool_ops = &ks8851_ethtool_ops;
1202 dev_set_drvdata(dev, ks);
1204 netif_carrier_off(ks->netdev);
1205 netdev->if_port = IF_PORT_100BASET;
1206 netdev->netdev_ops = &ks8851_netdev_ops;
1208 /* issue a global soft reset to reset the device. */
1209 ks8851_soft_reset(ks, GRR_GSR);
1211 /* simple check for a valid chip being connected to the bus */
1212 cider = ks8851_rdreg16(ks, KS_CIDER);
1213 if ((cider & ~CIDER_REV_MASK) != CIDER_ID) {
1214 dev_err(dev, "failed to read device ID\n");
1219 /* cache the contents of the CCR register for EEPROM, etc. */
1220 ks->rc_ccr = ks8851_rdreg16(ks, KS_CCR);
1222 ks8851_read_selftest(ks);
1223 ks8851_init_mac(ks, dev->of_node);
1225 ret = register_netdev(netdev);
1227 dev_err(dev, "failed to register network device\n");
1231 netdev_info(netdev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
1232 CIDER_REV_GET(cider), netdev->dev_addr, netdev->irq,
1233 ks->rc_ccr & CCR_EEPROM ? "has" : "no");
1238 ks8851_unregister_mdiobus(ks);
1241 gpiod_set_value_cansleep(ks->gpio, 1);
1242 regulator_disable(ks->vdd_reg);
1244 regulator_disable(ks->vdd_io);
1248 EXPORT_SYMBOL_GPL(ks8851_probe_common);
1250 void ks8851_remove_common(struct device *dev)
1252 struct ks8851_net *priv = dev_get_drvdata(dev);
1254 ks8851_unregister_mdiobus(priv);
1256 if (netif_msg_drv(priv))
1257 dev_info(dev, "remove\n");
1259 unregister_netdev(priv->netdev);
1261 gpiod_set_value_cansleep(priv->gpio, 1);
1262 regulator_disable(priv->vdd_reg);
1263 regulator_disable(priv->vdd_io);
1265 EXPORT_SYMBOL_GPL(ks8851_remove_common);
1267 MODULE_DESCRIPTION("KS8851 Network driver");
1269 MODULE_LICENSE("GPL");