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_pkts - receive packets from the host
236 * @ks: The device information.
237 * @rxq: Queue of packets received in this function.
239 * This is called from the IRQ work queue when the system detects that there
240 * are packets in the receive queue. Find out how many packets there are and
241 * read them from the FIFO.
243 static void ks8851_rx_pkts(struct ks8851_net *ks, struct sk_buff_head *rxq)
251 rxfc = (ks8851_rdreg16(ks, KS_RXFCTR) >> 8) & 0xff;
253 netif_dbg(ks, rx_status, ks->netdev,
254 "%s: %d packets\n", __func__, rxfc);
256 /* Currently we're issuing a read per packet, but we could possibly
257 * improve the code by issuing a single read, getting the receive
258 * header, allocating the packet and then reading the packet data
261 * This form of operation would require us to hold the SPI bus'
262 * chipselect low during the entie transaction to avoid any
263 * reset to the data stream coming from the chip.
266 for (; rxfc != 0; rxfc--) {
267 rxstat = ks8851_rdreg16(ks, KS_RXFHSR);
268 rxlen = ks8851_rdreg16(ks, KS_RXFHBCR) & RXFHBCR_CNT_MASK;
270 netif_dbg(ks, rx_status, ks->netdev,
271 "rx: stat 0x%04x, len 0x%04x\n", rxstat, rxlen);
273 /* the length of the packet includes the 32bit CRC */
275 /* set dma read address */
276 ks8851_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI | 0x00);
278 /* start DMA access */
279 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA);
282 unsigned int rxalign;
285 rxalign = ALIGN(rxlen, 4);
286 skb = netdev_alloc_skb_ip_align(ks->netdev, rxalign);
289 /* 4 bytes of status header + 4 bytes of
290 * garbage: we put them before ethernet
291 * header, so that they are copied,
295 rxpkt = skb_put(skb, rxlen) - 8;
297 ks->rdfifo(ks, rxpkt, rxalign + 8);
299 if (netif_msg_pktdata(ks))
300 ks8851_dbg_dumpkkt(ks, rxpkt);
302 skb->protocol = eth_type_trans(skb, ks->netdev);
303 __skb_queue_tail(rxq, skb);
305 ks->netdev->stats.rx_packets++;
306 ks->netdev->stats.rx_bytes += rxlen;
310 /* end DMA access and dequeue packet */
311 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_RRXEF);
316 * ks8851_irq - IRQ handler for dealing with interrupt requests
320 * This handler is invoked when the IRQ line asserts to find out what happened.
321 * As we cannot allow ourselves to sleep in HARDIRQ context, this handler runs
324 * Read the interrupt status, work out what needs to be done and then clear
325 * any of the interrupts that are not needed.
327 static irqreturn_t ks8851_irq(int irq, void *_ks)
329 struct ks8851_net *ks = _ks;
330 struct sk_buff_head rxq;
335 ks8851_lock(ks, &flags);
337 status = ks8851_rdreg16(ks, KS_ISR);
338 ks8851_wrreg16(ks, KS_ISR, status);
340 netif_dbg(ks, intr, ks->netdev,
341 "%s: status 0x%04x\n", __func__, status);
343 if (status & IRQ_LDI) {
344 u16 pmecr = ks8851_rdreg16(ks, KS_PMECR);
345 pmecr &= ~PMECR_WKEVT_MASK;
346 ks8851_wrreg16(ks, KS_PMECR, pmecr | PMECR_WKEVT_LINK);
349 if (status & IRQ_TXI) {
350 unsigned short tx_space = ks8851_rdreg16(ks, KS_TXMIR);
352 netif_dbg(ks, intr, ks->netdev,
353 "%s: txspace %d\n", __func__, tx_space);
355 spin_lock_bh(&ks->statelock);
356 ks->tx_space = tx_space;
357 if (netif_queue_stopped(ks->netdev))
358 netif_wake_queue(ks->netdev);
359 spin_unlock_bh(&ks->statelock);
362 if (status & IRQ_SPIBEI) {
363 netdev_err(ks->netdev, "%s: spi bus error\n", __func__);
366 if (status & IRQ_RXI) {
367 /* the datasheet says to disable the rx interrupt during
368 * packet read-out, however we're masking the interrupt
369 * from the device so do not bother masking just the RX
370 * from the device. */
372 __skb_queue_head_init(&rxq);
373 ks8851_rx_pkts(ks, &rxq);
376 /* if something stopped the rx process, probably due to wanting
377 * to change the rx settings, then do something about restarting
379 if (status & IRQ_RXPSI) {
380 struct ks8851_rxctrl *rxc = &ks->rxctrl;
382 /* update the multicast hash table */
383 ks8851_wrreg16(ks, KS_MAHTR0, rxc->mchash[0]);
384 ks8851_wrreg16(ks, KS_MAHTR1, rxc->mchash[1]);
385 ks8851_wrreg16(ks, KS_MAHTR2, rxc->mchash[2]);
386 ks8851_wrreg16(ks, KS_MAHTR3, rxc->mchash[3]);
388 ks8851_wrreg16(ks, KS_RXCR2, rxc->rxcr2);
389 ks8851_wrreg16(ks, KS_RXCR1, rxc->rxcr1);
392 ks8851_unlock(ks, &flags);
394 if (status & IRQ_LCI)
395 mii_check_link(&ks->mii);
397 if (status & IRQ_RXI)
398 while ((skb = __skb_dequeue(&rxq)))
405 * ks8851_flush_tx_work - flush outstanding TX work
406 * @ks: The device state
408 static void ks8851_flush_tx_work(struct ks8851_net *ks)
410 if (ks->flush_tx_work)
411 ks->flush_tx_work(ks);
415 * ks8851_net_open - open network device
416 * @dev: The network device being opened.
418 * Called when the network device is marked active, such as a user executing
419 * 'ifconfig up' on the device.
421 static int ks8851_net_open(struct net_device *dev)
423 struct ks8851_net *ks = netdev_priv(dev);
427 ret = request_threaded_irq(dev->irq, NULL, ks8851_irq,
428 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
431 netdev_err(dev, "failed to get irq\n");
435 /* lock the card, even if we may not actually be doing anything
436 * else at the moment */
437 ks8851_lock(ks, &flags);
439 netif_dbg(ks, ifup, ks->netdev, "opening\n");
441 /* bring chip out of any power saving mode it was in */
442 ks8851_set_powermode(ks, PMECR_PM_NORMAL);
444 /* issue a soft reset to the RX/TX QMU to put it into a known
446 ks8851_soft_reset(ks, GRR_QMU);
448 /* setup transmission parameters */
450 ks8851_wrreg16(ks, KS_TXCR, (TXCR_TXE | /* enable transmit process */
451 TXCR_TXPE | /* pad to min length */
452 TXCR_TXCRC | /* add CRC */
453 TXCR_TXFCE)); /* enable flow control */
455 /* auto-increment tx data, reset tx pointer */
456 ks8851_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
458 /* setup receiver control */
460 ks8851_wrreg16(ks, KS_RXCR1, (RXCR1_RXPAFMA | /* from mac filter */
461 RXCR1_RXFCE | /* enable flow control */
462 RXCR1_RXBE | /* broadcast enable */
463 RXCR1_RXUE | /* unicast enable */
464 RXCR1_RXE)); /* enable rx block */
466 /* transfer entire frames out in one go */
467 ks8851_wrreg16(ks, KS_RXCR2, RXCR2_SRDBL_FRAME);
469 /* set receive counter timeouts */
470 ks8851_wrreg16(ks, KS_RXDTTR, 1000); /* 1ms after first frame to IRQ */
471 ks8851_wrreg16(ks, KS_RXDBCTR, 4096); /* >4Kbytes in buffer to IRQ */
472 ks8851_wrreg16(ks, KS_RXFCTR, 10); /* 10 frames to IRQ */
474 ks->rc_rxqcr = (RXQCR_RXFCTE | /* IRQ on frame count exceeded */
475 RXQCR_RXDBCTE | /* IRQ on byte count exceeded */
476 RXQCR_RXDTTE); /* IRQ on time exceeded */
478 ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr);
480 /* clear then enable interrupts */
481 ks8851_wrreg16(ks, KS_ISR, ks->rc_ier);
482 ks8851_wrreg16(ks, KS_IER, ks->rc_ier);
485 ks->tx_space = ks8851_rdreg16(ks, KS_TXMIR);
486 netif_start_queue(ks->netdev);
488 netif_dbg(ks, ifup, ks->netdev, "network device up\n");
490 ks8851_unlock(ks, &flags);
491 mii_check_link(&ks->mii);
496 * ks8851_net_stop - close network device
497 * @dev: The device being closed.
499 * Called to close down a network device which has been active. Cancell any
500 * work, shutdown the RX and TX process and then place the chip into a low
501 * power state whilst it is not being used.
503 static int ks8851_net_stop(struct net_device *dev)
505 struct ks8851_net *ks = netdev_priv(dev);
508 netif_info(ks, ifdown, dev, "shutting down\n");
510 netif_stop_queue(dev);
512 ks8851_lock(ks, &flags);
513 /* turn off the IRQs and ack any outstanding */
514 ks8851_wrreg16(ks, KS_IER, 0x0000);
515 ks8851_wrreg16(ks, KS_ISR, 0xffff);
516 ks8851_unlock(ks, &flags);
518 /* stop any outstanding work */
519 ks8851_flush_tx_work(ks);
520 flush_work(&ks->rxctrl_work);
522 ks8851_lock(ks, &flags);
523 /* shutdown RX process */
524 ks8851_wrreg16(ks, KS_RXCR1, 0x0000);
526 /* shutdown TX process */
527 ks8851_wrreg16(ks, KS_TXCR, 0x0000);
529 /* set powermode to soft power down to save power */
530 ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
531 ks8851_unlock(ks, &flags);
533 /* ensure any queued tx buffers are dumped */
534 while (!skb_queue_empty(&ks->txq)) {
535 struct sk_buff *txb = skb_dequeue(&ks->txq);
537 netif_dbg(ks, ifdown, ks->netdev,
538 "%s: freeing txb %p\n", __func__, txb);
543 free_irq(dev->irq, ks);
549 * ks8851_start_xmit - transmit packet
550 * @skb: The buffer to transmit
551 * @dev: The device used to transmit the packet.
553 * Called by the network layer to transmit the @skb. Queue the packet for
554 * the device and schedule the necessary work to transmit the packet when
557 * We do this to firstly avoid sleeping with the network device locked,
558 * and secondly so we can round up more than one packet to transmit which
559 * means we can try and avoid generating too many transmit done interrupts.
561 static netdev_tx_t ks8851_start_xmit(struct sk_buff *skb,
562 struct net_device *dev)
564 struct ks8851_net *ks = netdev_priv(dev);
566 return ks->start_xmit(skb, dev);
570 * ks8851_rxctrl_work - work handler to change rx mode
571 * @work: The work structure this belongs to.
573 * Lock the device and issue the necessary changes to the receive mode from
574 * the network device layer. This is done so that we can do this without
575 * having to sleep whilst holding the network device lock.
577 * Since the recommendation from Micrel is that the RXQ is shutdown whilst the
578 * receive parameters are programmed, we issue a write to disable the RXQ and
579 * then wait for the interrupt handler to be triggered once the RXQ shutdown is
580 * complete. The interrupt handler then writes the new values into the chip.
582 static void ks8851_rxctrl_work(struct work_struct *work)
584 struct ks8851_net *ks = container_of(work, struct ks8851_net, rxctrl_work);
587 ks8851_lock(ks, &flags);
589 /* need to shutdown RXQ before modifying filter parameters */
590 ks8851_wrreg16(ks, KS_RXCR1, 0x00);
592 ks8851_unlock(ks, &flags);
595 static void ks8851_set_rx_mode(struct net_device *dev)
597 struct ks8851_net *ks = netdev_priv(dev);
598 struct ks8851_rxctrl rxctrl;
600 memset(&rxctrl, 0, sizeof(rxctrl));
602 if (dev->flags & IFF_PROMISC) {
603 /* interface to receive everything */
605 rxctrl.rxcr1 = RXCR1_RXAE | RXCR1_RXINVF;
606 } else if (dev->flags & IFF_ALLMULTI) {
607 /* accept all multicast packets */
609 rxctrl.rxcr1 = (RXCR1_RXME | RXCR1_RXAE |
610 RXCR1_RXPAFMA | RXCR1_RXMAFMA);
611 } else if (dev->flags & IFF_MULTICAST && !netdev_mc_empty(dev)) {
612 struct netdev_hw_addr *ha;
615 /* accept some multicast */
617 netdev_for_each_mc_addr(ha, dev) {
618 crc = ether_crc(ETH_ALEN, ha->addr);
619 crc >>= (32 - 6); /* get top six bits */
621 rxctrl.mchash[crc >> 4] |= (1 << (crc & 0xf));
624 rxctrl.rxcr1 = RXCR1_RXME | RXCR1_RXPAFMA;
626 /* just accept broadcast / unicast */
627 rxctrl.rxcr1 = RXCR1_RXPAFMA;
630 rxctrl.rxcr1 |= (RXCR1_RXUE | /* unicast enable */
631 RXCR1_RXBE | /* broadcast enable */
632 RXCR1_RXE | /* RX process enable */
633 RXCR1_RXFCE); /* enable flow control */
635 rxctrl.rxcr2 |= RXCR2_SRDBL_FRAME;
637 /* schedule work to do the actual set of the data if needed */
639 spin_lock_bh(&ks->statelock);
641 if (memcmp(&rxctrl, &ks->rxctrl, sizeof(rxctrl)) != 0) {
642 memcpy(&ks->rxctrl, &rxctrl, sizeof(ks->rxctrl));
643 schedule_work(&ks->rxctrl_work);
646 spin_unlock_bh(&ks->statelock);
649 static int ks8851_set_mac_address(struct net_device *dev, void *addr)
651 struct sockaddr *sa = addr;
653 if (netif_running(dev))
656 if (!is_valid_ether_addr(sa->sa_data))
657 return -EADDRNOTAVAIL;
659 eth_hw_addr_set(dev, sa->sa_data);
660 return ks8851_write_mac_addr(dev);
663 static int ks8851_net_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
665 struct ks8851_net *ks = netdev_priv(dev);
667 if (!netif_running(dev))
670 return generic_mii_ioctl(&ks->mii, if_mii(req), cmd, NULL);
673 static const struct net_device_ops ks8851_netdev_ops = {
674 .ndo_open = ks8851_net_open,
675 .ndo_stop = ks8851_net_stop,
676 .ndo_eth_ioctl = ks8851_net_ioctl,
677 .ndo_start_xmit = ks8851_start_xmit,
678 .ndo_set_mac_address = ks8851_set_mac_address,
679 .ndo_set_rx_mode = ks8851_set_rx_mode,
680 .ndo_validate_addr = eth_validate_addr,
683 /* ethtool support */
685 static void ks8851_get_drvinfo(struct net_device *dev,
686 struct ethtool_drvinfo *di)
688 strscpy(di->driver, "KS8851", sizeof(di->driver));
689 strscpy(di->version, "1.00", sizeof(di->version));
690 strscpy(di->bus_info, dev_name(dev->dev.parent), sizeof(di->bus_info));
693 static u32 ks8851_get_msglevel(struct net_device *dev)
695 struct ks8851_net *ks = netdev_priv(dev);
696 return ks->msg_enable;
699 static void ks8851_set_msglevel(struct net_device *dev, u32 to)
701 struct ks8851_net *ks = netdev_priv(dev);
705 static int ks8851_get_link_ksettings(struct net_device *dev,
706 struct ethtool_link_ksettings *cmd)
708 struct ks8851_net *ks = netdev_priv(dev);
710 mii_ethtool_get_link_ksettings(&ks->mii, cmd);
715 static int ks8851_set_link_ksettings(struct net_device *dev,
716 const struct ethtool_link_ksettings *cmd)
718 struct ks8851_net *ks = netdev_priv(dev);
719 return mii_ethtool_set_link_ksettings(&ks->mii, cmd);
722 static u32 ks8851_get_link(struct net_device *dev)
724 struct ks8851_net *ks = netdev_priv(dev);
725 return mii_link_ok(&ks->mii);
728 static int ks8851_nway_reset(struct net_device *dev)
730 struct ks8851_net *ks = netdev_priv(dev);
731 return mii_nway_restart(&ks->mii);
736 static void ks8851_eeprom_regread(struct eeprom_93cx6 *ee)
738 struct ks8851_net *ks = ee->data;
741 val = ks8851_rdreg16(ks, KS_EEPCR);
743 ee->reg_data_out = (val & EEPCR_EESB) ? 1 : 0;
744 ee->reg_data_clock = (val & EEPCR_EESCK) ? 1 : 0;
745 ee->reg_chip_select = (val & EEPCR_EECS) ? 1 : 0;
748 static void ks8851_eeprom_regwrite(struct eeprom_93cx6 *ee)
750 struct ks8851_net *ks = ee->data;
751 unsigned val = EEPCR_EESA; /* default - eeprom access on */
757 if (ee->reg_data_clock)
759 if (ee->reg_chip_select)
762 ks8851_wrreg16(ks, KS_EEPCR, val);
766 * ks8851_eeprom_claim - claim device EEPROM and activate the interface
767 * @ks: The network device state.
769 * Check for the presence of an EEPROM, and then activate software access
772 static int ks8851_eeprom_claim(struct ks8851_net *ks)
774 /* start with clock low, cs high */
775 ks8851_wrreg16(ks, KS_EEPCR, EEPCR_EESA | EEPCR_EECS);
780 * ks8851_eeprom_release - release the EEPROM interface
781 * @ks: The device state
783 * Release the software access to the device EEPROM
785 static void ks8851_eeprom_release(struct ks8851_net *ks)
787 unsigned val = ks8851_rdreg16(ks, KS_EEPCR);
789 ks8851_wrreg16(ks, KS_EEPCR, val & ~EEPCR_EESA);
792 #define KS_EEPROM_MAGIC (0x00008851)
794 static int ks8851_set_eeprom(struct net_device *dev,
795 struct ethtool_eeprom *ee, u8 *data)
797 struct ks8851_net *ks = netdev_priv(dev);
798 int offset = ee->offset;
803 /* currently only support byte writing */
807 if (ee->magic != KS_EEPROM_MAGIC)
810 if (!(ks->rc_ccr & CCR_EEPROM))
813 ks8851_lock(ks, &flags);
815 ks8851_eeprom_claim(ks);
817 eeprom_93cx6_wren(&ks->eeprom, true);
819 /* ethtool currently only supports writing bytes, which means
820 * we have to read/modify/write our 16bit EEPROMs */
822 eeprom_93cx6_read(&ks->eeprom, offset/2, &tmp);
832 eeprom_93cx6_write(&ks->eeprom, offset/2, tmp);
833 eeprom_93cx6_wren(&ks->eeprom, false);
835 ks8851_eeprom_release(ks);
836 ks8851_unlock(ks, &flags);
841 static int ks8851_get_eeprom(struct net_device *dev,
842 struct ethtool_eeprom *ee, u8 *data)
844 struct ks8851_net *ks = netdev_priv(dev);
845 int offset = ee->offset;
849 /* must be 2 byte aligned */
850 if (len & 1 || offset & 1)
853 if (!(ks->rc_ccr & CCR_EEPROM))
856 ks8851_lock(ks, &flags);
858 ks8851_eeprom_claim(ks);
860 ee->magic = KS_EEPROM_MAGIC;
862 eeprom_93cx6_multiread(&ks->eeprom, offset/2, (__le16 *)data, len/2);
863 ks8851_eeprom_release(ks);
864 ks8851_unlock(ks, &flags);
869 static int ks8851_get_eeprom_len(struct net_device *dev)
871 struct ks8851_net *ks = netdev_priv(dev);
873 /* currently, we assume it is an 93C46 attached, so return 128 */
874 return ks->rc_ccr & CCR_EEPROM ? 128 : 0;
877 static const struct ethtool_ops ks8851_ethtool_ops = {
878 .get_drvinfo = ks8851_get_drvinfo,
879 .get_msglevel = ks8851_get_msglevel,
880 .set_msglevel = ks8851_set_msglevel,
881 .get_link = ks8851_get_link,
882 .nway_reset = ks8851_nway_reset,
883 .get_eeprom_len = ks8851_get_eeprom_len,
884 .get_eeprom = ks8851_get_eeprom,
885 .set_eeprom = ks8851_set_eeprom,
886 .get_link_ksettings = ks8851_get_link_ksettings,
887 .set_link_ksettings = ks8851_set_link_ksettings,
890 /* MII interface controls */
893 * ks8851_phy_reg - convert MII register into a KS8851 register
894 * @reg: MII register number.
896 * Return the KS8851 register number for the corresponding MII PHY register
897 * if possible. Return zero if the MII register has no direct mapping to the
898 * KS8851 register set.
900 static int ks8851_phy_reg(int reg)
920 static int ks8851_phy_read_common(struct net_device *dev, int phy_addr, int reg)
922 struct ks8851_net *ks = netdev_priv(dev);
927 ksreg = ks8851_phy_reg(reg);
931 ks8851_lock(ks, &flags);
932 result = ks8851_rdreg16(ks, ksreg);
933 ks8851_unlock(ks, &flags);
939 * ks8851_phy_read - MII interface PHY register read.
940 * @dev: The network device the PHY is on.
941 * @phy_addr: Address of PHY (ignored as we only have one)
942 * @reg: The register to read.
944 * This call reads data from the PHY register specified in @reg. Since the
945 * device does not support all the MII registers, the non-existent values
946 * are always returned as zero.
948 * We return zero for unsupported registers as the MII code does not check
949 * the value returned for any error status, and simply returns it to the
950 * caller. The mii-tool that the driver was tested with takes any -ve error
951 * as real PHY capabilities, thus displaying incorrect data to the user.
953 static int ks8851_phy_read(struct net_device *dev, int phy_addr, int reg)
957 ret = ks8851_phy_read_common(dev, phy_addr, reg);
959 return 0x0; /* no error return allowed, so use zero */
964 static void ks8851_phy_write(struct net_device *dev,
965 int phy, int reg, int value)
967 struct ks8851_net *ks = netdev_priv(dev);
971 ksreg = ks8851_phy_reg(reg);
973 ks8851_lock(ks, &flags);
974 ks8851_wrreg16(ks, ksreg, value);
975 ks8851_unlock(ks, &flags);
979 static int ks8851_mdio_read(struct mii_bus *bus, int phy_id, int reg)
981 struct ks8851_net *ks = bus->priv;
986 /* KS8851 PHY ID registers are swapped in HW, swap them back. */
987 if (reg == MII_PHYSID1)
989 else if (reg == MII_PHYSID2)
992 return ks8851_phy_read_common(ks->netdev, phy_id, reg);
995 static int ks8851_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
997 struct ks8851_net *ks = bus->priv;
999 ks8851_phy_write(ks->netdev, phy_id, reg, val);
1004 * ks8851_read_selftest - read the selftest memory info.
1005 * @ks: The device state
1007 * Read and check the TX/RX memory selftest information.
1009 static void ks8851_read_selftest(struct ks8851_net *ks)
1011 unsigned both_done = MBIR_TXMBF | MBIR_RXMBF;
1014 rd = ks8851_rdreg16(ks, KS_MBIR);
1016 if ((rd & both_done) != both_done) {
1017 netdev_warn(ks->netdev, "Memory selftest not finished\n");
1021 if (rd & MBIR_TXMBFA)
1022 netdev_err(ks->netdev, "TX memory selftest fail\n");
1024 if (rd & MBIR_RXMBFA)
1025 netdev_err(ks->netdev, "RX memory selftest fail\n");
1028 /* driver bus management functions */
1030 #ifdef CONFIG_PM_SLEEP
1032 int ks8851_suspend(struct device *dev)
1034 struct ks8851_net *ks = dev_get_drvdata(dev);
1035 struct net_device *netdev = ks->netdev;
1037 if (netif_running(netdev)) {
1038 netif_device_detach(netdev);
1039 ks8851_net_stop(netdev);
1044 EXPORT_SYMBOL_GPL(ks8851_suspend);
1046 int ks8851_resume(struct device *dev)
1048 struct ks8851_net *ks = dev_get_drvdata(dev);
1049 struct net_device *netdev = ks->netdev;
1051 if (netif_running(netdev)) {
1052 ks8851_net_open(netdev);
1053 netif_device_attach(netdev);
1058 EXPORT_SYMBOL_GPL(ks8851_resume);
1061 static int ks8851_register_mdiobus(struct ks8851_net *ks, struct device *dev)
1063 struct mii_bus *mii_bus;
1066 mii_bus = mdiobus_alloc();
1070 mii_bus->name = "ks8851_eth_mii";
1071 mii_bus->read = ks8851_mdio_read;
1072 mii_bus->write = ks8851_mdio_write;
1074 mii_bus->parent = dev;
1075 mii_bus->phy_mask = ~((u32)BIT(0));
1076 snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(dev));
1078 ret = mdiobus_register(mii_bus);
1080 goto err_mdiobus_register;
1082 ks->mii_bus = mii_bus;
1086 err_mdiobus_register:
1087 mdiobus_free(mii_bus);
1091 static void ks8851_unregister_mdiobus(struct ks8851_net *ks)
1093 mdiobus_unregister(ks->mii_bus);
1094 mdiobus_free(ks->mii_bus);
1097 int ks8851_probe_common(struct net_device *netdev, struct device *dev,
1100 struct ks8851_net *ks = netdev_priv(netdev);
1104 ks->netdev = netdev;
1106 ks->gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
1107 ret = PTR_ERR_OR_ZERO(ks->gpio);
1109 if (ret != -EPROBE_DEFER)
1110 dev_err(dev, "reset gpio request failed: %d\n", ret);
1114 ret = gpiod_set_consumer_name(ks->gpio, "ks8851_rst_n");
1116 dev_err(dev, "failed to set reset gpio name: %d\n", ret);
1120 ks->vdd_io = devm_regulator_get(dev, "vdd-io");
1121 if (IS_ERR(ks->vdd_io)) {
1122 ret = PTR_ERR(ks->vdd_io);
1126 ret = regulator_enable(ks->vdd_io);
1128 dev_err(dev, "regulator vdd_io enable fail: %d\n", ret);
1132 ks->vdd_reg = devm_regulator_get(dev, "vdd");
1133 if (IS_ERR(ks->vdd_reg)) {
1134 ret = PTR_ERR(ks->vdd_reg);
1138 ret = regulator_enable(ks->vdd_reg);
1140 dev_err(dev, "regulator vdd enable fail: %d\n", ret);
1145 usleep_range(10000, 11000);
1146 gpiod_set_value_cansleep(ks->gpio, 0);
1149 spin_lock_init(&ks->statelock);
1151 INIT_WORK(&ks->rxctrl_work, ks8851_rxctrl_work);
1153 SET_NETDEV_DEV(netdev, dev);
1155 /* setup EEPROM state */
1156 ks->eeprom.data = ks;
1157 ks->eeprom.width = PCI_EEPROM_WIDTH_93C46;
1158 ks->eeprom.register_read = ks8851_eeprom_regread;
1159 ks->eeprom.register_write = ks8851_eeprom_regwrite;
1161 /* setup mii state */
1162 ks->mii.dev = netdev;
1164 ks->mii.phy_id_mask = 1;
1165 ks->mii.reg_num_mask = 0xf;
1166 ks->mii.mdio_read = ks8851_phy_read;
1167 ks->mii.mdio_write = ks8851_phy_write;
1169 dev_info(dev, "message enable is %d\n", msg_en);
1171 ret = ks8851_register_mdiobus(ks, dev);
1175 /* set the default message enable */
1176 ks->msg_enable = netif_msg_init(msg_en, NETIF_MSG_DRV |
1180 skb_queue_head_init(&ks->txq);
1182 netdev->ethtool_ops = &ks8851_ethtool_ops;
1184 dev_set_drvdata(dev, ks);
1186 netif_carrier_off(ks->netdev);
1187 netdev->if_port = IF_PORT_100BASET;
1188 netdev->netdev_ops = &ks8851_netdev_ops;
1190 /* issue a global soft reset to reset the device. */
1191 ks8851_soft_reset(ks, GRR_GSR);
1193 /* simple check for a valid chip being connected to the bus */
1194 cider = ks8851_rdreg16(ks, KS_CIDER);
1195 if ((cider & ~CIDER_REV_MASK) != CIDER_ID) {
1196 dev_err(dev, "failed to read device ID\n");
1201 /* cache the contents of the CCR register for EEPROM, etc. */
1202 ks->rc_ccr = ks8851_rdreg16(ks, KS_CCR);
1204 ks8851_read_selftest(ks);
1205 ks8851_init_mac(ks, dev->of_node);
1207 ret = register_netdev(netdev);
1209 dev_err(dev, "failed to register network device\n");
1213 netdev_info(netdev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
1214 CIDER_REV_GET(cider), netdev->dev_addr, netdev->irq,
1215 ks->rc_ccr & CCR_EEPROM ? "has" : "no");
1220 ks8851_unregister_mdiobus(ks);
1223 gpiod_set_value_cansleep(ks->gpio, 1);
1224 regulator_disable(ks->vdd_reg);
1226 regulator_disable(ks->vdd_io);
1230 EXPORT_SYMBOL_GPL(ks8851_probe_common);
1232 void ks8851_remove_common(struct device *dev)
1234 struct ks8851_net *priv = dev_get_drvdata(dev);
1236 ks8851_unregister_mdiobus(priv);
1238 if (netif_msg_drv(priv))
1239 dev_info(dev, "remove\n");
1241 unregister_netdev(priv->netdev);
1243 gpiod_set_value_cansleep(priv->gpio, 1);
1244 regulator_disable(priv->vdd_reg);
1245 regulator_disable(priv->vdd_io);
1247 EXPORT_SYMBOL_GPL(ks8851_remove_common);
1249 MODULE_DESCRIPTION("KS8851 Network driver");
1251 MODULE_LICENSE("GPL");