Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/net/ethernet/dnet.c

  1 /*
  2  * Dave DNET Ethernet Controller driver
  3  *
  4  * Copyright (C) 2008 Dave S.r.l. <www.dave.eu>
  5  * Copyright (C) 2009 Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com>
  6  *
  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.
 10  */
 11 #include <linux/io.h>
 12 #include <linux/module.h>
 13 #include <linux/moduleparam.h>
 14 #include <linux/kernel.h>
 15 #include <linux/types.h>
 16 #include <linux/slab.h>
 17 #include <linux/delay.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/netdevice.h>
 20 #include <linux/etherdevice.h>
 21 #include <linux/dma-mapping.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/phy.h>
 24 
 25 #include "dnet.h"
 26 
 27 #undef DEBUG
 28 
 29 /* function for reading internal MAC register */
 30 static u16 dnet_readw_mac(struct dnet *bp, u16 reg)
 31 {
 32         u16 data_read;
 33 
 34         /* issue a read */
 35         dnet_writel(bp, reg, MACREG_ADDR);
 36 
 37         /* since a read/write op to the MAC is very slow,
 38          * we must wait before reading the data */
 39         ndelay(500);
 40 
 41         /* read data read from the MAC register */
 42         data_read = dnet_readl(bp, MACREG_DATA);
 43 
 44         /* all done */
 45         return data_read;
 46 }
 47 
 48 /* function for writing internal MAC register */
 49 static void dnet_writew_mac(struct dnet *bp, u16 reg, u16 val)
 50 {
 51         /* load data to write */
 52         dnet_writel(bp, val, MACREG_DATA);
 53 
 54         /* issue a write */
 55         dnet_writel(bp, reg | DNET_INTERNAL_WRITE, MACREG_ADDR);
 56 
 57         /* since a read/write op to the MAC is very slow,
 58          * we must wait before exiting */
 59         ndelay(500);
 60 }
 61 
 62 static void __dnet_set_hwaddr(struct dnet *bp)
 63 {
 64         u16 tmp;
 65 
 66         tmp = be16_to_cpup((__be16 *)bp->dev->dev_addr);
 67         dnet_writew_mac(bp, DNET_INTERNAL_MAC_ADDR_0_REG, tmp);
 68         tmp = be16_to_cpup((__be16 *)(bp->dev->dev_addr + 2));
 69         dnet_writew_mac(bp, DNET_INTERNAL_MAC_ADDR_1_REG, tmp);
 70         tmp = be16_to_cpup((__be16 *)(bp->dev->dev_addr + 4));
 71         dnet_writew_mac(bp, DNET_INTERNAL_MAC_ADDR_2_REG, tmp);
 72 }
 73 
 74 static void dnet_get_hwaddr(struct dnet *bp)
 75 {
 76         u16 tmp;
 77         u8 addr[6];
 78 
 79         /*
 80          * from MAC docs:
 81          * "Note that the MAC address is stored in the registers in Hexadecimal
 82          * form. For example, to set the MAC Address to: AC-DE-48-00-00-80
 83          * would require writing 0xAC (octet 0) to address 0x0B (high byte of
 84          * Mac_addr[15:0]), 0xDE (octet 1) to address 0x0A (Low byte of
 85          * Mac_addr[15:0]), 0x48 (octet 2) to address 0x0D (high byte of
 86          * Mac_addr[15:0]), 0x00 (octet 3) to address 0x0C (Low byte of
 87          * Mac_addr[15:0]), 0x00 (octet 4) to address 0x0F (high byte of
 88          * Mac_addr[15:0]), and 0x80 (octet 5) to address * 0x0E (Low byte of
 89          * Mac_addr[15:0]).
 90          */
 91         tmp = dnet_readw_mac(bp, DNET_INTERNAL_MAC_ADDR_0_REG);
 92         *((__be16 *)addr) = cpu_to_be16(tmp);
 93         tmp = dnet_readw_mac(bp, DNET_INTERNAL_MAC_ADDR_1_REG);
 94         *((__be16 *)(addr + 2)) = cpu_to_be16(tmp);
 95         tmp = dnet_readw_mac(bp, DNET_INTERNAL_MAC_ADDR_2_REG);
 96         *((__be16 *)(addr + 4)) = cpu_to_be16(tmp);
 97 
 98         if (is_valid_ether_addr(addr))
 99                 memcpy(bp->dev->dev_addr, addr, sizeof(addr));
100 }
101 
102 static int dnet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
103 {
104         struct dnet *bp = bus->priv;
105         u16 value;
106 
107         while (!(dnet_readw_mac(bp, DNET_INTERNAL_GMII_MNG_CTL_REG)
108                                 & DNET_INTERNAL_GMII_MNG_CMD_FIN))
109                 cpu_relax();
110 
111         /* only 5 bits allowed for phy-addr and reg_offset */
112         mii_id &= 0x1f;
113         regnum &= 0x1f;
114 
115         /* prepare reg_value for a read */
116         value = (mii_id << 8);
117         value |= regnum;
118 
119         /* write control word */
120         dnet_writew_mac(bp, DNET_INTERNAL_GMII_MNG_CTL_REG, value);
121 
122         /* wait for end of transfer */
123         while (!(dnet_readw_mac(bp, DNET_INTERNAL_GMII_MNG_CTL_REG)
124                                 & DNET_INTERNAL_GMII_MNG_CMD_FIN))
125                 cpu_relax();
126 
127         value = dnet_readw_mac(bp, DNET_INTERNAL_GMII_MNG_DAT_REG);
128 
129         pr_debug("mdio_read %02x:%02x <- %04x\n", mii_id, regnum, value);
130 
131         return value;
132 }
133 
134 static int dnet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
135                            u16 value)
136 {
137         struct dnet *bp = bus->priv;
138         u16 tmp;
139 
140         pr_debug("mdio_write %02x:%02x <- %04x\n", mii_id, regnum, value);
141 
142         while (!(dnet_readw_mac(bp, DNET_INTERNAL_GMII_MNG_CTL_REG)
143                                 & DNET_INTERNAL_GMII_MNG_CMD_FIN))
144                 cpu_relax();
145 
146         /* prepare for a write operation */
147         tmp = (1 << 13);
148 
149         /* only 5 bits allowed for phy-addr and reg_offset */
150         mii_id &= 0x1f;
151         regnum &= 0x1f;
152 
153         /* only 16 bits on data */
154         value &= 0xffff;
155 
156         /* prepare reg_value for a write */
157         tmp |= (mii_id << 8);
158         tmp |= regnum;
159 
160         /* write data to write first */
161         dnet_writew_mac(bp, DNET_INTERNAL_GMII_MNG_DAT_REG, value);
162 
163         /* write control word */
164         dnet_writew_mac(bp, DNET_INTERNAL_GMII_MNG_CTL_REG, tmp);
165 
166         while (!(dnet_readw_mac(bp, DNET_INTERNAL_GMII_MNG_CTL_REG)
167                                 & DNET_INTERNAL_GMII_MNG_CMD_FIN))
168                 cpu_relax();
169 
170         return 0;
171 }
172 
173 static void dnet_handle_link_change(struct net_device *dev)
174 {
175         struct dnet *bp = netdev_priv(dev);
176         struct phy_device *phydev = bp->phy_dev;
177         unsigned long flags;
178         u32 mode_reg, ctl_reg;
179 
180         int status_change = 0;
181 
182         spin_lock_irqsave(&bp->lock, flags);
183 
184         mode_reg = dnet_readw_mac(bp, DNET_INTERNAL_MODE_REG);
185         ctl_reg = dnet_readw_mac(bp, DNET_INTERNAL_RXTX_CONTROL_REG);
186 
187         if (phydev->link) {
188                 if (bp->duplex != phydev->duplex) {
189                         if (phydev->duplex)
190                                 ctl_reg &=
191                                     ~(DNET_INTERNAL_RXTX_CONTROL_ENABLEHALFDUP);
192                         else
193                                 ctl_reg |=
194                                     DNET_INTERNAL_RXTX_CONTROL_ENABLEHALFDUP;
195 
196                         bp->duplex = phydev->duplex;
197                         status_change = 1;
198                 }
199 
200                 if (bp->speed != phydev->speed) {
201                         status_change = 1;
202                         switch (phydev->speed) {
203                         case 1000:
204                                 mode_reg |= DNET_INTERNAL_MODE_GBITEN;
205                                 break;
206                         case 100:
207                         case 10:
208                                 mode_reg &= ~DNET_INTERNAL_MODE_GBITEN;
209                                 break;
210                         default:
211                                 printk(KERN_WARNING
212                                        "%s: Ack!  Speed (%d) is not "
213                                        "10/100/1000!\n", dev->name,
214                                        phydev->speed);
215                                 break;
216                         }
217                         bp->speed = phydev->speed;
218                 }
219         }
220 
221         if (phydev->link != bp->link) {
222                 if (phydev->link) {
223                         mode_reg |=
224                             (DNET_INTERNAL_MODE_RXEN | DNET_INTERNAL_MODE_TXEN);
225                 } else {
226                         mode_reg &=
227                             ~(DNET_INTERNAL_MODE_RXEN |
228                               DNET_INTERNAL_MODE_TXEN);
229                         bp->speed = 0;
230                         bp->duplex = -1;
231                 }
232                 bp->link = phydev->link;
233 
234                 status_change = 1;
235         }
236 
237         if (status_change) {
238                 dnet_writew_mac(bp, DNET_INTERNAL_RXTX_CONTROL_REG, ctl_reg);
239                 dnet_writew_mac(bp, DNET_INTERNAL_MODE_REG, mode_reg);
240         }
241 
242         spin_unlock_irqrestore(&bp->lock, flags);
243 
244         if (status_change) {
245                 if (phydev->link)
246                         printk(KERN_INFO "%s: link up (%d/%s)\n",
247                                dev->name, phydev->speed,
248                                DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
249                 else
250                         printk(KERN_INFO "%s: link down\n", dev->name);
251         }
252 }
253 
254 static int dnet_mii_probe(struct net_device *dev)
255 {
256         struct dnet *bp = netdev_priv(dev);
257         struct phy_device *phydev = NULL;
258         int phy_addr;
259 
260         /* find the first phy */
261         for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
262                 if (bp->mii_bus->phy_map[phy_addr]) {
263                         phydev = bp->mii_bus->phy_map[phy_addr];
264                         break;
265                 }
266         }
267 
268         if (!phydev) {
269                 printk(KERN_ERR "%s: no PHY found\n", dev->name);
270                 return -ENODEV;
271         }
272 
273         /* TODO : add pin_irq */
274 
275         /* attach the mac to the phy */
276         if (bp->capabilities & DNET_HAS_RMII) {
277                 phydev = phy_connect(dev, dev_name(&phydev->dev),
278                                      &dnet_handle_link_change,
279                                      PHY_INTERFACE_MODE_RMII);
280         } else {
281                 phydev = phy_connect(dev, dev_name(&phydev->dev),
282                                      &dnet_handle_link_change,
283                                      PHY_INTERFACE_MODE_MII);
284         }
285 
286         if (IS_ERR(phydev)) {
287                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
288                 return PTR_ERR(phydev);
289         }
290 
291         /* mask with MAC supported features */
292         if (bp->capabilities & DNET_HAS_GIGABIT)
293                 phydev->supported &= PHY_GBIT_FEATURES;
294         else
295                 phydev->supported &= PHY_BASIC_FEATURES;
296 
297         phydev->supported |= SUPPORTED_Asym_Pause | SUPPORTED_Pause;
298 
299         phydev->advertising = phydev->supported;
300 
301         bp->link = 0;
302         bp->speed = 0;
303         bp->duplex = -1;
304         bp->phy_dev = phydev;
305 
306         return 0;
307 }
308 
309 static int dnet_mii_init(struct dnet *bp)
310 {
311         int err, i;
312 
313         bp->mii_bus = mdiobus_alloc();
314         if (bp->mii_bus == NULL)
315                 return -ENOMEM;
316 
317         bp->mii_bus->name = "dnet_mii_bus";
318         bp->mii_bus->read = &dnet_mdio_read;
319         bp->mii_bus->write = &dnet_mdio_write;
320 
321         snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
322                 bp->pdev->name, bp->pdev->id);
323 
324         bp->mii_bus->priv = bp;
325 
326         bp->mii_bus->irq = devm_kmalloc(&bp->pdev->dev,
327                                         sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
328         if (!bp->mii_bus->irq) {
329                 err = -ENOMEM;
330                 goto err_out;
331         }
332 
333         for (i = 0; i < PHY_MAX_ADDR; i++)
334                 bp->mii_bus->irq[i] = PHY_POLL;
335 
336         if (mdiobus_register(bp->mii_bus)) {
337                 err = -ENXIO;
338                 goto err_out;
339         }
340 
341         if (dnet_mii_probe(bp->dev) != 0) {
342                 err = -ENXIO;
343                 goto err_out_unregister_bus;
344         }
345 
346         return 0;
347 
348 err_out_unregister_bus:
349         mdiobus_unregister(bp->mii_bus);
350 err_out:
351         mdiobus_free(bp->mii_bus);
352         return err;
353 }
354 
355 /* For Neptune board: LINK1000 as Link LED and TX as activity LED */
356 static int dnet_phy_marvell_fixup(struct phy_device *phydev)
357 {
358         return phy_write(phydev, 0x18, 0x4148);
359 }
360 
361 static void dnet_update_stats(struct dnet *bp)
362 {
363         u32 __iomem *reg = bp->regs + DNET_RX_PKT_IGNR_CNT;
364         u32 *p = &bp->hw_stats.rx_pkt_ignr;
365         u32 *end = &bp->hw_stats.rx_byte + 1;
366 
367         WARN_ON((unsigned long)(end - p - 1) !=
368                 (DNET_RX_BYTE_CNT - DNET_RX_PKT_IGNR_CNT) / 4);
369 
370         for (; p < end; p++, reg++)
371                 *p += readl(reg);
372 
373         reg = bp->regs + DNET_TX_UNICAST_CNT;
374         p = &bp->hw_stats.tx_unicast;
375         end = &bp->hw_stats.tx_byte + 1;
376 
377         WARN_ON((unsigned long)(end - p - 1) !=
378                 (DNET_TX_BYTE_CNT - DNET_TX_UNICAST_CNT) / 4);
379 
380         for (; p < end; p++, reg++)
381                 *p += readl(reg);
382 }
383 
384 static int dnet_poll(struct napi_struct *napi, int budget)
385 {
386         struct dnet *bp = container_of(napi, struct dnet, napi);
387         struct net_device *dev = bp->dev;
388         int npackets = 0;
389         unsigned int pkt_len;
390         struct sk_buff *skb;
391         unsigned int *data_ptr;
392         u32 int_enable;
393         u32 cmd_word;
394         int i;
395 
396         while (npackets < budget) {
397                 /*
398                  * break out of while loop if there are no more
399                  * packets waiting
400                  */
401                 if (!(dnet_readl(bp, RX_FIFO_WCNT) >> 16)) {
402                         napi_complete(napi);
403                         int_enable = dnet_readl(bp, INTR_ENB);
404                         int_enable |= DNET_INTR_SRC_RX_CMDFIFOAF;
405                         dnet_writel(bp, int_enable, INTR_ENB);
406                         return 0;
407                 }
408 
409                 cmd_word = dnet_readl(bp, RX_LEN_FIFO);
410                 pkt_len = cmd_word & 0xFFFF;
411 
412                 if (cmd_word & 0xDF180000)
413                         printk(KERN_ERR "%s packet receive error %x\n",
414                                __func__, cmd_word);
415 
416                 skb = netdev_alloc_skb(dev, pkt_len + 5);
417                 if (skb != NULL) {
418                         /* Align IP on 16 byte boundaries */
419                         skb_reserve(skb, 2);
420                         /*
421                          * 'skb_put()' points to the start of sk_buff
422                          * data area.
423                          */
424                         data_ptr = (unsigned int *)skb_put(skb, pkt_len);
425                         for (i = 0; i < (pkt_len + 3) >> 2; i++)
426                                 *data_ptr++ = dnet_readl(bp, RX_DATA_FIFO);
427                         skb->protocol = eth_type_trans(skb, dev);
428                         netif_receive_skb(skb);
429                         npackets++;
430                 } else
431                         printk(KERN_NOTICE
432                                "%s: No memory to allocate a sk_buff of "
433                                "size %u.\n", dev->name, pkt_len);
434         }
435 
436         budget -= npackets;
437 
438         if (npackets < budget) {
439                 /* We processed all packets available.  Tell NAPI it can
440                  * stop polling then re-enable rx interrupts */
441                 napi_complete(napi);
442                 int_enable = dnet_readl(bp, INTR_ENB);
443                 int_enable |= DNET_INTR_SRC_RX_CMDFIFOAF;
444                 dnet_writel(bp, int_enable, INTR_ENB);
445                 return 0;
446         }
447 
448         /* There are still packets waiting */
449         return 1;
450 }
451 
452 static irqreturn_t dnet_interrupt(int irq, void *dev_id)
453 {
454         struct net_device *dev = dev_id;
455         struct dnet *bp = netdev_priv(dev);
456         u32 int_src, int_enable, int_current;
457         unsigned long flags;
458         unsigned int handled = 0;
459 
460         spin_lock_irqsave(&bp->lock, flags);
461 
462         /* read and clear the DNET irq (clear on read) */
463         int_src = dnet_readl(bp, INTR_SRC);
464         int_enable = dnet_readl(bp, INTR_ENB);
465         int_current = int_src & int_enable;
466 
467         /* restart the queue if we had stopped it for TX fifo almost full */
468         if (int_current & DNET_INTR_SRC_TX_FIFOAE) {
469                 int_enable = dnet_readl(bp, INTR_ENB);
470                 int_enable &= ~DNET_INTR_ENB_TX_FIFOAE;
471                 dnet_writel(bp, int_enable, INTR_ENB);
472                 netif_wake_queue(dev);
473                 handled = 1;
474         }
475 
476         /* RX FIFO error checking */
477         if (int_current &
478             (DNET_INTR_SRC_RX_CMDFIFOFF | DNET_INTR_SRC_RX_DATAFIFOFF)) {
479                 printk(KERN_ERR "%s: RX fifo error %x, irq %x\n", __func__,
480                        dnet_readl(bp, RX_STATUS), int_current);
481                 /* we can only flush the RX FIFOs */
482                 dnet_writel(bp, DNET_SYS_CTL_RXFIFOFLUSH, SYS_CTL);
483                 ndelay(500);
484                 dnet_writel(bp, 0, SYS_CTL);
485                 handled = 1;
486         }
487 
488         /* TX FIFO error checking */
489         if (int_current &
490             (DNET_INTR_SRC_TX_FIFOFULL | DNET_INTR_SRC_TX_DISCFRM)) {
491                 printk(KERN_ERR "%s: TX fifo error %x, irq %x\n", __func__,
492                        dnet_readl(bp, TX_STATUS), int_current);
493                 /* we can only flush the TX FIFOs */
494                 dnet_writel(bp, DNET_SYS_CTL_TXFIFOFLUSH, SYS_CTL);
495                 ndelay(500);
496                 dnet_writel(bp, 0, SYS_CTL);
497                 handled = 1;
498         }
499 
500         if (int_current & DNET_INTR_SRC_RX_CMDFIFOAF) {
501                 if (napi_schedule_prep(&bp->napi)) {
502                         /*
503                          * There's no point taking any more interrupts
504                          * until we have processed the buffers
505                          */
506                         /* Disable Rx interrupts and schedule NAPI poll */
507                         int_enable = dnet_readl(bp, INTR_ENB);
508                         int_enable &= ~DNET_INTR_SRC_RX_CMDFIFOAF;
509                         dnet_writel(bp, int_enable, INTR_ENB);
510                         __napi_schedule(&bp->napi);
511                 }
512                 handled = 1;
513         }
514 
515         if (!handled)
516                 pr_debug("%s: irq %x remains\n", __func__, int_current);
517 
518         spin_unlock_irqrestore(&bp->lock, flags);
519 
520         return IRQ_RETVAL(handled);
521 }
522 
523 #ifdef DEBUG
524 static inline void dnet_print_skb(struct sk_buff *skb)
525 {
526         int k;
527         printk(KERN_DEBUG PFX "data:");
528         for (k = 0; k < skb->len; k++)
529                 printk(" %02x", (unsigned int)skb->data[k]);
530         printk("\n");
531 }
532 #else
533 #define dnet_print_skb(skb)     do {} while (0)
534 #endif
535 
536 static netdev_tx_t dnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
537 {
538 
539         struct dnet *bp = netdev_priv(dev);
540         u32 tx_status, irq_enable;
541         unsigned int len, i, tx_cmd, wrsz;
542         unsigned long flags;
543         unsigned int *bufp;
544 
545         tx_status = dnet_readl(bp, TX_STATUS);
546 
547         pr_debug("start_xmit: len %u head %p data %p\n",
548                skb->len, skb->head, skb->data);
549         dnet_print_skb(skb);
550 
551         /* frame size (words) */
552         len = (skb->len + 3) >> 2;
553 
554         spin_lock_irqsave(&bp->lock, flags);
555 
556         tx_status = dnet_readl(bp, TX_STATUS);
557 
558         bufp = (unsigned int *)(((unsigned long) skb->data) & ~0x3UL);
559         wrsz = (u32) skb->len + 3;
560         wrsz += ((unsigned long) skb->data) & 0x3;
561         wrsz >>= 2;
562         tx_cmd = ((((unsigned long)(skb->data)) & 0x03) << 16) | (u32) skb->len;
563 
564         /* check if there is enough room for the current frame */
565         if (wrsz < (DNET_FIFO_SIZE - dnet_readl(bp, TX_FIFO_WCNT))) {
566                 for (i = 0; i < wrsz; i++)
567                         dnet_writel(bp, *bufp++, TX_DATA_FIFO);
568 
569                 /*
570                  * inform MAC that a packet's written and ready to be
571                  * shipped out
572                  */
573                 dnet_writel(bp, tx_cmd, TX_LEN_FIFO);
574         }
575 
576         if (dnet_readl(bp, TX_FIFO_WCNT) > DNET_FIFO_TX_DATA_AF_TH) {
577                 netif_stop_queue(dev);
578                 tx_status = dnet_readl(bp, INTR_SRC);
579                 irq_enable = dnet_readl(bp, INTR_ENB);
580                 irq_enable |= DNET_INTR_ENB_TX_FIFOAE;
581                 dnet_writel(bp, irq_enable, INTR_ENB);
582         }
583 
584         skb_tx_timestamp(skb);
585 
586         /* free the buffer */
587         dev_kfree_skb(skb);
588 
589         spin_unlock_irqrestore(&bp->lock, flags);
590 
591         return NETDEV_TX_OK;
592 }
593 
594 static void dnet_reset_hw(struct dnet *bp)
595 {
596         /* put ts_mac in IDLE state i.e. disable rx/tx */
597         dnet_writew_mac(bp, DNET_INTERNAL_MODE_REG, DNET_INTERNAL_MODE_FCEN);
598 
599         /*
600          * RX FIFO almost full threshold: only cmd FIFO almost full is
601          * implemented for RX side
602          */
603         dnet_writel(bp, DNET_FIFO_RX_CMD_AF_TH, RX_FIFO_TH);
604         /*
605          * TX FIFO almost empty threshold: only data FIFO almost empty
606          * is implemented for TX side
607          */
608         dnet_writel(bp, DNET_FIFO_TX_DATA_AE_TH, TX_FIFO_TH);
609 
610         /* flush rx/tx fifos */
611         dnet_writel(bp, DNET_SYS_CTL_RXFIFOFLUSH | DNET_SYS_CTL_TXFIFOFLUSH,
612                         SYS_CTL);
613         msleep(1);
614         dnet_writel(bp, 0, SYS_CTL);
615 }
616 
617 static void dnet_init_hw(struct dnet *bp)
618 {
619         u32 config;
620 
621         dnet_reset_hw(bp);
622         __dnet_set_hwaddr(bp);
623 
624         config = dnet_readw_mac(bp, DNET_INTERNAL_RXTX_CONTROL_REG);
625 
626         if (bp->dev->flags & IFF_PROMISC)
627                 /* Copy All Frames */
628                 config |= DNET_INTERNAL_RXTX_CONTROL_ENPROMISC;
629         if (!(bp->dev->flags & IFF_BROADCAST))
630                 /* No BroadCast */
631                 config |= DNET_INTERNAL_RXTX_CONTROL_RXMULTICAST;
632 
633         config |= DNET_INTERNAL_RXTX_CONTROL_RXPAUSE |
634             DNET_INTERNAL_RXTX_CONTROL_RXBROADCAST |
635             DNET_INTERNAL_RXTX_CONTROL_DROPCONTROL |
636             DNET_INTERNAL_RXTX_CONTROL_DISCFXFCS;
637 
638         dnet_writew_mac(bp, DNET_INTERNAL_RXTX_CONTROL_REG, config);
639 
640         /* clear irq before enabling them */
641         config = dnet_readl(bp, INTR_SRC);
642 
643         /* enable RX/TX interrupt, recv packet ready interrupt */
644         dnet_writel(bp, DNET_INTR_ENB_GLOBAL_ENABLE | DNET_INTR_ENB_RX_SUMMARY |
645                         DNET_INTR_ENB_TX_SUMMARY | DNET_INTR_ENB_RX_FIFOERR |
646                         DNET_INTR_ENB_RX_ERROR | DNET_INTR_ENB_RX_FIFOFULL |
647                         DNET_INTR_ENB_TX_FIFOFULL | DNET_INTR_ENB_TX_DISCFRM |
648                         DNET_INTR_ENB_RX_PKTRDY, INTR_ENB);
649 }
650 
651 static int dnet_open(struct net_device *dev)
652 {
653         struct dnet *bp = netdev_priv(dev);
654 
655         /* if the phy is not yet register, retry later */
656         if (!bp->phy_dev)
657                 return -EAGAIN;
658 
659         napi_enable(&bp->napi);
660         dnet_init_hw(bp);
661 
662         phy_start_aneg(bp->phy_dev);
663 
664         /* schedule a link state check */
665         phy_start(bp->phy_dev);
666 
667         netif_start_queue(dev);
668 
669         return 0;
670 }
671 
672 static int dnet_close(struct net_device *dev)
673 {
674         struct dnet *bp = netdev_priv(dev);
675 
676         netif_stop_queue(dev);
677         napi_disable(&bp->napi);
678 
679         if (bp->phy_dev)
680                 phy_stop(bp->phy_dev);
681 
682         dnet_reset_hw(bp);
683         netif_carrier_off(dev);
684 
685         return 0;
686 }
687 
688 static inline void dnet_print_pretty_hwstats(struct dnet_stats *hwstat)
689 {
690         pr_debug("%s\n", __func__);
691         pr_debug("----------------------------- RX statistics "
692                  "-------------------------------\n");
693         pr_debug("RX_PKT_IGNR_CNT %-8x\n", hwstat->rx_pkt_ignr);
694         pr_debug("RX_LEN_CHK_ERR_CNT %-8x\n", hwstat->rx_len_chk_err);
695         pr_debug("RX_LNG_FRM_CNT %-8x\n", hwstat->rx_lng_frm);
696         pr_debug("RX_SHRT_FRM_CNT %-8x\n", hwstat->rx_shrt_frm);
697         pr_debug("RX_IPG_VIOL_CNT %-8x\n", hwstat->rx_ipg_viol);
698         pr_debug("RX_CRC_ERR_CNT %-8x\n", hwstat->rx_crc_err);
699         pr_debug("RX_OK_PKT_CNT %-8x\n", hwstat->rx_ok_pkt);
700         pr_debug("RX_CTL_FRM_CNT %-8x\n", hwstat->rx_ctl_frm);
701         pr_debug("RX_PAUSE_FRM_CNT %-8x\n", hwstat->rx_pause_frm);
702         pr_debug("RX_MULTICAST_CNT %-8x\n", hwstat->rx_multicast);
703         pr_debug("RX_BROADCAST_CNT %-8x\n", hwstat->rx_broadcast);
704         pr_debug("RX_VLAN_TAG_CNT %-8x\n", hwstat->rx_vlan_tag);
705         pr_debug("RX_PRE_SHRINK_CNT %-8x\n", hwstat->rx_pre_shrink);
706         pr_debug("RX_DRIB_NIB_CNT %-8x\n", hwstat->rx_drib_nib);
707         pr_debug("RX_UNSUP_OPCD_CNT %-8x\n", hwstat->rx_unsup_opcd);
708         pr_debug("RX_BYTE_CNT %-8x\n", hwstat->rx_byte);
709         pr_debug("----------------------------- TX statistics "
710                  "-------------------------------\n");
711         pr_debug("TX_UNICAST_CNT %-8x\n", hwstat->tx_unicast);
712         pr_debug("TX_PAUSE_FRM_CNT %-8x\n", hwstat->tx_pause_frm);
713         pr_debug("TX_MULTICAST_CNT %-8x\n", hwstat->tx_multicast);
714         pr_debug("TX_BRDCAST_CNT %-8x\n", hwstat->tx_brdcast);
715         pr_debug("TX_VLAN_TAG_CNT %-8x\n", hwstat->tx_vlan_tag);
716         pr_debug("TX_BAD_FCS_CNT %-8x\n", hwstat->tx_bad_fcs);
717         pr_debug("TX_JUMBO_CNT %-8x\n", hwstat->tx_jumbo);
718         pr_debug("TX_BYTE_CNT %-8x\n", hwstat->tx_byte);
719 }
720 
721 static struct net_device_stats *dnet_get_stats(struct net_device *dev)
722 {
723 
724         struct dnet *bp = netdev_priv(dev);
725         struct net_device_stats *nstat = &dev->stats;
726         struct dnet_stats *hwstat = &bp->hw_stats;
727 
728         /* read stats from hardware */
729         dnet_update_stats(bp);
730 
731         /* Convert HW stats into netdevice stats */
732         nstat->rx_errors = (hwstat->rx_len_chk_err +
733                             hwstat->rx_lng_frm + hwstat->rx_shrt_frm +
734                             /* ignore IGP violation error
735                             hwstat->rx_ipg_viol + */
736                             hwstat->rx_crc_err +
737                             hwstat->rx_pre_shrink +
738                             hwstat->rx_drib_nib + hwstat->rx_unsup_opcd);
739         nstat->tx_errors = hwstat->tx_bad_fcs;
740         nstat->rx_length_errors = (hwstat->rx_len_chk_err +
741                                    hwstat->rx_lng_frm +
742                                    hwstat->rx_shrt_frm + hwstat->rx_pre_shrink);
743         nstat->rx_crc_errors = hwstat->rx_crc_err;
744         nstat->rx_frame_errors = hwstat->rx_pre_shrink + hwstat->rx_drib_nib;
745         nstat->rx_packets = hwstat->rx_ok_pkt;
746         nstat->tx_packets = (hwstat->tx_unicast +
747                              hwstat->tx_multicast + hwstat->tx_brdcast);
748         nstat->rx_bytes = hwstat->rx_byte;
749         nstat->tx_bytes = hwstat->tx_byte;
750         nstat->multicast = hwstat->rx_multicast;
751         nstat->rx_missed_errors = hwstat->rx_pkt_ignr;
752 
753         dnet_print_pretty_hwstats(hwstat);
754 
755         return nstat;
756 }
757 
758 static int dnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
759 {
760         struct dnet *bp = netdev_priv(dev);
761         struct phy_device *phydev = bp->phy_dev;
762 
763         if (!phydev)
764                 return -ENODEV;
765 
766         return phy_ethtool_gset(phydev, cmd);
767 }
768 
769 static int dnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
770 {
771         struct dnet *bp = netdev_priv(dev);
772         struct phy_device *phydev = bp->phy_dev;
773 
774         if (!phydev)
775                 return -ENODEV;
776 
777         return phy_ethtool_sset(phydev, cmd);
778 }
779 
780 static int dnet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
781 {
782         struct dnet *bp = netdev_priv(dev);
783         struct phy_device *phydev = bp->phy_dev;
784 
785         if (!netif_running(dev))
786                 return -EINVAL;
787 
788         if (!phydev)
789                 return -ENODEV;
790 
791         return phy_mii_ioctl(phydev, rq, cmd);
792 }
793 
794 static void dnet_get_drvinfo(struct net_device *dev,
795                              struct ethtool_drvinfo *info)
796 {
797         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
798         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
799         strlcpy(info->bus_info, "", sizeof(info->bus_info));
800 }
801 
802 static const struct ethtool_ops dnet_ethtool_ops = {
803         .get_settings           = dnet_get_settings,
804         .set_settings           = dnet_set_settings,
805         .get_drvinfo            = dnet_get_drvinfo,
806         .get_link               = ethtool_op_get_link,
807         .get_ts_info            = ethtool_op_get_ts_info,
808 };
809 
810 static const struct net_device_ops dnet_netdev_ops = {
811         .ndo_open               = dnet_open,
812         .ndo_stop               = dnet_close,
813         .ndo_get_stats          = dnet_get_stats,
814         .ndo_start_xmit         = dnet_start_xmit,
815         .ndo_do_ioctl           = dnet_ioctl,
816         .ndo_set_mac_address    = eth_mac_addr,
817         .ndo_validate_addr      = eth_validate_addr,
818         .ndo_change_mtu         = eth_change_mtu,
819 };
820 
821 static int dnet_probe(struct platform_device *pdev)
822 {
823         struct resource *res;
824         struct net_device *dev;
825         struct dnet *bp;
826         struct phy_device *phydev;
827         int err;
828         unsigned int irq;
829 
830         irq = platform_get_irq(pdev, 0);
831 
832         dev = alloc_etherdev(sizeof(*bp));
833         if (!dev)
834                 return -ENOMEM;
835 
836         /* TODO: Actually, we have some interesting features... */
837         dev->features |= 0;
838 
839         bp = netdev_priv(dev);
840         bp->dev = dev;
841 
842         platform_set_drvdata(pdev, dev);
843         SET_NETDEV_DEV(dev, &pdev->dev);
844 
845         spin_lock_init(&bp->lock);
846 
847         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
848         bp->regs = devm_ioremap_resource(&pdev->dev, res);
849         if (IS_ERR(bp->regs)) {
850                 err = PTR_ERR(bp->regs);
851                 goto err_out_free_dev;
852         }
853 
854         dev->irq = irq;
855         err = request_irq(dev->irq, dnet_interrupt, 0, DRV_NAME, dev);
856         if (err) {
857                 dev_err(&pdev->dev, "Unable to request IRQ %d (error %d)\n",
858                        irq, err);
859                 goto err_out_free_dev;
860         }
861 
862         dev->netdev_ops = &dnet_netdev_ops;
863         netif_napi_add(dev, &bp->napi, dnet_poll, 64);
864         dev->ethtool_ops = &dnet_ethtool_ops;
865 
866         dev->base_addr = (unsigned long)bp->regs;
867 
868         bp->capabilities = dnet_readl(bp, VERCAPS) & DNET_CAPS_MASK;
869 
870         dnet_get_hwaddr(bp);
871 
872         if (!is_valid_ether_addr(dev->dev_addr)) {
873                 /* choose a random ethernet address */
874                 eth_hw_addr_random(dev);
875                 __dnet_set_hwaddr(bp);
876         }
877 
878         err = register_netdev(dev);
879         if (err) {
880                 dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
881                 goto err_out_free_irq;
882         }
883 
884         /* register the PHY board fixup (for Marvell 88E1111) */
885         err = phy_register_fixup_for_uid(0x01410cc0, 0xfffffff0,
886                                          dnet_phy_marvell_fixup);
887         /* we can live without it, so just issue a warning */
888         if (err)
889                 dev_warn(&pdev->dev, "Cannot register PHY board fixup.\n");
890 
891         err = dnet_mii_init(bp);
892         if (err)
893                 goto err_out_unregister_netdev;
894 
895         dev_info(&pdev->dev, "Dave DNET at 0x%p (0x%08x) irq %d %pM\n",
896                bp->regs, (unsigned int)res->start, dev->irq, dev->dev_addr);
897         dev_info(&pdev->dev, "has %smdio, %sirq, %sgigabit, %sdma\n",
898                (bp->capabilities & DNET_HAS_MDIO) ? "" : "no ",
899                (bp->capabilities & DNET_HAS_IRQ) ? "" : "no ",
900                (bp->capabilities & DNET_HAS_GIGABIT) ? "" : "no ",
901                (bp->capabilities & DNET_HAS_DMA) ? "" : "no ");
902         phydev = bp->phy_dev;
903         dev_info(&pdev->dev, "attached PHY driver [%s] "
904                "(mii_bus:phy_addr=%s, irq=%d)\n",
905                phydev->drv->name, dev_name(&phydev->dev), phydev->irq);
906 
907         return 0;
908 
909 err_out_unregister_netdev:
910         unregister_netdev(dev);
911 err_out_free_irq:
912         free_irq(dev->irq, dev);
913 err_out_free_dev:
914         free_netdev(dev);
915         return err;
916 }
917 
918 static int dnet_remove(struct platform_device *pdev)
919 {
920 
921         struct net_device *dev;
922         struct dnet *bp;
923 
924         dev = platform_get_drvdata(pdev);
925 
926         if (dev) {
927                 bp = netdev_priv(dev);
928                 if (bp->phy_dev)
929                         phy_disconnect(bp->phy_dev);
930                 mdiobus_unregister(bp->mii_bus);
931                 mdiobus_free(bp->mii_bus);
932                 unregister_netdev(dev);
933                 free_irq(dev->irq, dev);
934                 free_netdev(dev);
935         }
936 
937         return 0;
938 }
939 
940 static struct platform_driver dnet_driver = {
941         .probe          = dnet_probe,
942         .remove         = dnet_remove,
943         .driver         = {
944                 .name           = "dnet",
945         },
946 };
947 
948 module_platform_driver(dnet_driver);
949 
950 MODULE_LICENSE("GPL");
951 MODULE_DESCRIPTION("Dave DNET Ethernet driver");
952 MODULE_AUTHOR("Ilya Yanok <yanok@emcraft.com>, "
953               "Matteo Vit <matteo.vit@dave.eu>");
954 

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