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net: r6040: Utilize napi_complete_done()
[deliverable/linux.git] / drivers / net / ethernet / rdc / r6040.c
1 /*
2 * RDC R6040 Fast Ethernet MAC support
3 *
4 * Copyright (C) 2004 Sten Wang <sten.wang@rdc.com.tw>
5 * Copyright (C) 2007
6 * Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
7 * Copyright (C) 2007-2012 Florian Fainelli <florian@openwrt.org>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the
21 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/errno.h>
31 #include <linux/ioport.h>
32 #include <linux/interrupt.h>
33 #include <linux/pci.h>
34 #include <linux/netdevice.h>
35 #include <linux/etherdevice.h>
36 #include <linux/skbuff.h>
37 #include <linux/delay.h>
38 #include <linux/mii.h>
39 #include <linux/ethtool.h>
40 #include <linux/crc32.h>
41 #include <linux/spinlock.h>
42 #include <linux/bitops.h>
43 #include <linux/io.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
46 #include <linux/phy.h>
47
48 #include <asm/processor.h>
49
50 #define DRV_NAME "r6040"
51 #define DRV_VERSION "0.28"
52 #define DRV_RELDATE "07Oct2011"
53
54 /* Time in jiffies before concluding the transmitter is hung. */
55 #define TX_TIMEOUT (6000 * HZ / 1000)
56
57 /* RDC MAC I/O Size */
58 #define R6040_IO_SIZE 256
59
60 /* MAX RDC MAC */
61 #define MAX_MAC 2
62
63 /* MAC registers */
64 #define MCR0 0x00 /* Control register 0 */
65 #define MCR0_RCVEN 0x0002 /* Receive enable */
66 #define MCR0_PROMISC 0x0020 /* Promiscuous mode */
67 #define MCR0_HASH_EN 0x0100 /* Enable multicast hash table function */
68 #define MCR0_XMTEN 0x1000 /* Transmission enable */
69 #define MCR0_FD 0x8000 /* Full/Half duplex */
70 #define MCR1 0x04 /* Control register 1 */
71 #define MAC_RST 0x0001 /* Reset the MAC */
72 #define MBCR 0x08 /* Bus control */
73 #define MT_ICR 0x0C /* TX interrupt control */
74 #define MR_ICR 0x10 /* RX interrupt control */
75 #define MTPR 0x14 /* TX poll command register */
76 #define TM2TX 0x0001 /* Trigger MAC to transmit */
77 #define MR_BSR 0x18 /* RX buffer size */
78 #define MR_DCR 0x1A /* RX descriptor control */
79 #define MLSR 0x1C /* Last status */
80 #define TX_FIFO_UNDR 0x0200 /* TX FIFO under-run */
81 #define TX_EXCEEDC 0x2000 /* Transmit exceed collision */
82 #define TX_LATEC 0x4000 /* Transmit late collision */
83 #define MMDIO 0x20 /* MDIO control register */
84 #define MDIO_WRITE 0x4000 /* MDIO write */
85 #define MDIO_READ 0x2000 /* MDIO read */
86 #define MMRD 0x24 /* MDIO read data register */
87 #define MMWD 0x28 /* MDIO write data register */
88 #define MTD_SA0 0x2C /* TX descriptor start address 0 */
89 #define MTD_SA1 0x30 /* TX descriptor start address 1 */
90 #define MRD_SA0 0x34 /* RX descriptor start address 0 */
91 #define MRD_SA1 0x38 /* RX descriptor start address 1 */
92 #define MISR 0x3C /* Status register */
93 #define MIER 0x40 /* INT enable register */
94 #define MSK_INT 0x0000 /* Mask off interrupts */
95 #define RX_FINISH 0x0001 /* RX finished */
96 #define RX_NO_DESC 0x0002 /* No RX descriptor available */
97 #define RX_FIFO_FULL 0x0004 /* RX FIFO full */
98 #define RX_EARLY 0x0008 /* RX early */
99 #define TX_FINISH 0x0010 /* TX finished */
100 #define TX_EARLY 0x0080 /* TX early */
101 #define EVENT_OVRFL 0x0100 /* Event counter overflow */
102 #define LINK_CHANGED 0x0200 /* PHY link changed */
103 #define ME_CISR 0x44 /* Event counter INT status */
104 #define ME_CIER 0x48 /* Event counter INT enable */
105 #define MR_CNT 0x50 /* Successfully received packet counter */
106 #define ME_CNT0 0x52 /* Event counter 0 */
107 #define ME_CNT1 0x54 /* Event counter 1 */
108 #define ME_CNT2 0x56 /* Event counter 2 */
109 #define ME_CNT3 0x58 /* Event counter 3 */
110 #define MT_CNT 0x5A /* Successfully transmit packet counter */
111 #define ME_CNT4 0x5C /* Event counter 4 */
112 #define MP_CNT 0x5E /* Pause frame counter register */
113 #define MAR0 0x60 /* Hash table 0 */
114 #define MAR1 0x62 /* Hash table 1 */
115 #define MAR2 0x64 /* Hash table 2 */
116 #define MAR3 0x66 /* Hash table 3 */
117 #define MID_0L 0x68 /* Multicast address MID0 Low */
118 #define MID_0M 0x6A /* Multicast address MID0 Medium */
119 #define MID_0H 0x6C /* Multicast address MID0 High */
120 #define MID_1L 0x70 /* MID1 Low */
121 #define MID_1M 0x72 /* MID1 Medium */
122 #define MID_1H 0x74 /* MID1 High */
123 #define MID_2L 0x78 /* MID2 Low */
124 #define MID_2M 0x7A /* MID2 Medium */
125 #define MID_2H 0x7C /* MID2 High */
126 #define MID_3L 0x80 /* MID3 Low */
127 #define MID_3M 0x82 /* MID3 Medium */
128 #define MID_3H 0x84 /* MID3 High */
129 #define PHY_CC 0x88 /* PHY status change configuration register */
130 #define SCEN 0x8000 /* PHY status change enable */
131 #define PHYAD_SHIFT 8 /* PHY address shift */
132 #define TMRDIV_SHIFT 0 /* Timer divider shift */
133 #define PHY_ST 0x8A /* PHY status register */
134 #define MAC_SM 0xAC /* MAC status machine */
135 #define MAC_SM_RST 0x0002 /* MAC status machine reset */
136 #define MAC_ID 0xBE /* Identifier register */
137
138 #define TX_DCNT 0x80 /* TX descriptor count */
139 #define RX_DCNT 0x80 /* RX descriptor count */
140 #define MAX_BUF_SIZE 0x600
141 #define RX_DESC_SIZE (RX_DCNT * sizeof(struct r6040_descriptor))
142 #define TX_DESC_SIZE (TX_DCNT * sizeof(struct r6040_descriptor))
143 #define MBCR_DEFAULT 0x012A /* MAC Bus Control Register */
144 #define MCAST_MAX 3 /* Max number multicast addresses to filter */
145
146 #define MAC_DEF_TIMEOUT 2048 /* Default MAC read/write operation timeout */
147
148 /* Descriptor status */
149 #define DSC_OWNER_MAC 0x8000 /* MAC is the owner of this descriptor */
150 #define DSC_RX_OK 0x4000 /* RX was successful */
151 #define DSC_RX_ERR 0x0800 /* RX PHY error */
152 #define DSC_RX_ERR_DRI 0x0400 /* RX dribble packet */
153 #define DSC_RX_ERR_BUF 0x0200 /* RX length exceeds buffer size */
154 #define DSC_RX_ERR_LONG 0x0100 /* RX length > maximum packet length */
155 #define DSC_RX_ERR_RUNT 0x0080 /* RX packet length < 64 byte */
156 #define DSC_RX_ERR_CRC 0x0040 /* RX CRC error */
157 #define DSC_RX_BCAST 0x0020 /* RX broadcast (no error) */
158 #define DSC_RX_MCAST 0x0010 /* RX multicast (no error) */
159 #define DSC_RX_MCH_HIT 0x0008 /* RX multicast hit in hash table (no error) */
160 #define DSC_RX_MIDH_HIT 0x0004 /* RX MID table hit (no error) */
161 #define DSC_RX_IDX_MID_MASK 3 /* RX mask for the index of matched MIDx */
162
163 MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>,"
164 "Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,"
165 "Florian Fainelli <florian@openwrt.org>");
166 MODULE_LICENSE("GPL");
167 MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver");
168 MODULE_VERSION(DRV_VERSION " " DRV_RELDATE);
169
170 /* RX and TX interrupts that we handle */
171 #define RX_INTS (RX_FIFO_FULL | RX_NO_DESC | RX_FINISH)
172 #define TX_INTS (TX_FINISH)
173 #define INT_MASK (RX_INTS | TX_INTS)
174
175 struct r6040_descriptor {
176 u16 status, len; /* 0-3 */
177 __le32 buf; /* 4-7 */
178 __le32 ndesc; /* 8-B */
179 u32 rev1; /* C-F */
180 char *vbufp; /* 10-13 */
181 struct r6040_descriptor *vndescp; /* 14-17 */
182 struct sk_buff *skb_ptr; /* 18-1B */
183 u32 rev2; /* 1C-1F */
184 } __aligned(32);
185
186 struct r6040_private {
187 spinlock_t lock; /* driver lock */
188 struct pci_dev *pdev;
189 struct r6040_descriptor *rx_insert_ptr;
190 struct r6040_descriptor *rx_remove_ptr;
191 struct r6040_descriptor *tx_insert_ptr;
192 struct r6040_descriptor *tx_remove_ptr;
193 struct r6040_descriptor *rx_ring;
194 struct r6040_descriptor *tx_ring;
195 dma_addr_t rx_ring_dma;
196 dma_addr_t tx_ring_dma;
197 u16 tx_free_desc;
198 u16 mcr0;
199 struct net_device *dev;
200 struct mii_bus *mii_bus;
201 struct napi_struct napi;
202 void __iomem *base;
203 int old_link;
204 int old_duplex;
205 };
206
207 static char version[] = DRV_NAME
208 ": RDC R6040 NAPI net driver,"
209 "version "DRV_VERSION " (" DRV_RELDATE ")";
210
211 /* Read a word data from PHY Chip */
212 static int r6040_phy_read(void __iomem *ioaddr, int phy_addr, int reg)
213 {
214 int limit = MAC_DEF_TIMEOUT;
215 u16 cmd;
216
217 iowrite16(MDIO_READ + reg + (phy_addr << 8), ioaddr + MMDIO);
218 /* Wait for the read bit to be cleared */
219 while (limit--) {
220 cmd = ioread16(ioaddr + MMDIO);
221 if (!(cmd & MDIO_READ))
222 break;
223 udelay(1);
224 }
225
226 if (limit < 0)
227 return -ETIMEDOUT;
228
229 return ioread16(ioaddr + MMRD);
230 }
231
232 /* Write a word data from PHY Chip */
233 static int r6040_phy_write(void __iomem *ioaddr,
234 int phy_addr, int reg, u16 val)
235 {
236 int limit = MAC_DEF_TIMEOUT;
237 u16 cmd;
238
239 iowrite16(val, ioaddr + MMWD);
240 /* Write the command to the MDIO bus */
241 iowrite16(MDIO_WRITE + reg + (phy_addr << 8), ioaddr + MMDIO);
242 /* Wait for the write bit to be cleared */
243 while (limit--) {
244 cmd = ioread16(ioaddr + MMDIO);
245 if (!(cmd & MDIO_WRITE))
246 break;
247 udelay(1);
248 }
249
250 return (limit < 0) ? -ETIMEDOUT : 0;
251 }
252
253 static int r6040_mdiobus_read(struct mii_bus *bus, int phy_addr, int reg)
254 {
255 struct net_device *dev = bus->priv;
256 struct r6040_private *lp = netdev_priv(dev);
257 void __iomem *ioaddr = lp->base;
258
259 return r6040_phy_read(ioaddr, phy_addr, reg);
260 }
261
262 static int r6040_mdiobus_write(struct mii_bus *bus, int phy_addr,
263 int reg, u16 value)
264 {
265 struct net_device *dev = bus->priv;
266 struct r6040_private *lp = netdev_priv(dev);
267 void __iomem *ioaddr = lp->base;
268
269 return r6040_phy_write(ioaddr, phy_addr, reg, value);
270 }
271
272 static void r6040_free_txbufs(struct net_device *dev)
273 {
274 struct r6040_private *lp = netdev_priv(dev);
275 int i;
276
277 for (i = 0; i < TX_DCNT; i++) {
278 if (lp->tx_insert_ptr->skb_ptr) {
279 pci_unmap_single(lp->pdev,
280 le32_to_cpu(lp->tx_insert_ptr->buf),
281 MAX_BUF_SIZE, PCI_DMA_TODEVICE);
282 dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
283 lp->tx_insert_ptr->skb_ptr = NULL;
284 }
285 lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
286 }
287 }
288
289 static void r6040_free_rxbufs(struct net_device *dev)
290 {
291 struct r6040_private *lp = netdev_priv(dev);
292 int i;
293
294 for (i = 0; i < RX_DCNT; i++) {
295 if (lp->rx_insert_ptr->skb_ptr) {
296 pci_unmap_single(lp->pdev,
297 le32_to_cpu(lp->rx_insert_ptr->buf),
298 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
299 dev_kfree_skb(lp->rx_insert_ptr->skb_ptr);
300 lp->rx_insert_ptr->skb_ptr = NULL;
301 }
302 lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp;
303 }
304 }
305
306 static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring,
307 dma_addr_t desc_dma, int size)
308 {
309 struct r6040_descriptor *desc = desc_ring;
310 dma_addr_t mapping = desc_dma;
311
312 while (size-- > 0) {
313 mapping += sizeof(*desc);
314 desc->ndesc = cpu_to_le32(mapping);
315 desc->vndescp = desc + 1;
316 desc++;
317 }
318 desc--;
319 desc->ndesc = cpu_to_le32(desc_dma);
320 desc->vndescp = desc_ring;
321 }
322
323 static void r6040_init_txbufs(struct net_device *dev)
324 {
325 struct r6040_private *lp = netdev_priv(dev);
326
327 lp->tx_free_desc = TX_DCNT;
328
329 lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring;
330 r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT);
331 }
332
333 static int r6040_alloc_rxbufs(struct net_device *dev)
334 {
335 struct r6040_private *lp = netdev_priv(dev);
336 struct r6040_descriptor *desc;
337 struct sk_buff *skb;
338 int rc;
339
340 lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring;
341 r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT);
342
343 /* Allocate skbs for the rx descriptors */
344 desc = lp->rx_ring;
345 do {
346 skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
347 if (!skb) {
348 rc = -ENOMEM;
349 goto err_exit;
350 }
351 desc->skb_ptr = skb;
352 desc->buf = cpu_to_le32(pci_map_single(lp->pdev,
353 desc->skb_ptr->data,
354 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE));
355 desc->status = DSC_OWNER_MAC;
356 desc = desc->vndescp;
357 } while (desc != lp->rx_ring);
358
359 return 0;
360
361 err_exit:
362 /* Deallocate all previously allocated skbs */
363 r6040_free_rxbufs(dev);
364 return rc;
365 }
366
367 static void r6040_reset_mac(struct r6040_private *lp)
368 {
369 void __iomem *ioaddr = lp->base;
370 int limit = MAC_DEF_TIMEOUT;
371 u16 cmd;
372
373 iowrite16(MAC_RST, ioaddr + MCR1);
374 while (limit--) {
375 cmd = ioread16(ioaddr + MCR1);
376 if (cmd & MAC_RST)
377 break;
378 }
379
380 /* Reset internal state machine */
381 iowrite16(MAC_SM_RST, ioaddr + MAC_SM);
382 iowrite16(0, ioaddr + MAC_SM);
383 mdelay(5);
384 }
385
386 static void r6040_init_mac_regs(struct net_device *dev)
387 {
388 struct r6040_private *lp = netdev_priv(dev);
389 void __iomem *ioaddr = lp->base;
390
391 /* Mask Off Interrupt */
392 iowrite16(MSK_INT, ioaddr + MIER);
393
394 /* Reset RDC MAC */
395 r6040_reset_mac(lp);
396
397 /* MAC Bus Control Register */
398 iowrite16(MBCR_DEFAULT, ioaddr + MBCR);
399
400 /* Buffer Size Register */
401 iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR);
402
403 /* Write TX ring start address */
404 iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0);
405 iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1);
406
407 /* Write RX ring start address */
408 iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0);
409 iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1);
410
411 /* Set interrupt waiting time and packet numbers */
412 iowrite16(0, ioaddr + MT_ICR);
413 iowrite16(0, ioaddr + MR_ICR);
414
415 /* Enable interrupts */
416 iowrite16(INT_MASK, ioaddr + MIER);
417
418 /* Enable TX and RX */
419 iowrite16(lp->mcr0 | MCR0_RCVEN, ioaddr);
420
421 /* Let TX poll the descriptors
422 * we may got called by r6040_tx_timeout which has left
423 * some unsent tx buffers */
424 iowrite16(TM2TX, ioaddr + MTPR);
425 }
426
427 static void r6040_tx_timeout(struct net_device *dev)
428 {
429 struct r6040_private *priv = netdev_priv(dev);
430 void __iomem *ioaddr = priv->base;
431
432 netdev_warn(dev, "transmit timed out, int enable %4.4x "
433 "status %4.4x\n",
434 ioread16(ioaddr + MIER),
435 ioread16(ioaddr + MISR));
436
437 dev->stats.tx_errors++;
438
439 /* Reset MAC and re-init all registers */
440 r6040_init_mac_regs(dev);
441 }
442
443 static struct net_device_stats *r6040_get_stats(struct net_device *dev)
444 {
445 struct r6040_private *priv = netdev_priv(dev);
446 void __iomem *ioaddr = priv->base;
447 unsigned long flags;
448
449 spin_lock_irqsave(&priv->lock, flags);
450 dev->stats.rx_crc_errors += ioread8(ioaddr + ME_CNT1);
451 dev->stats.multicast += ioread8(ioaddr + ME_CNT0);
452 spin_unlock_irqrestore(&priv->lock, flags);
453
454 return &dev->stats;
455 }
456
457 /* Stop RDC MAC and Free the allocated resource */
458 static void r6040_down(struct net_device *dev)
459 {
460 struct r6040_private *lp = netdev_priv(dev);
461 void __iomem *ioaddr = lp->base;
462 u16 *adrp;
463
464 /* Stop MAC */
465 iowrite16(MSK_INT, ioaddr + MIER); /* Mask Off Interrupt */
466
467 /* Reset RDC MAC */
468 r6040_reset_mac(lp);
469
470 /* Restore MAC Address to MIDx */
471 adrp = (u16 *) dev->dev_addr;
472 iowrite16(adrp[0], ioaddr + MID_0L);
473 iowrite16(adrp[1], ioaddr + MID_0M);
474 iowrite16(adrp[2], ioaddr + MID_0H);
475
476 phy_stop(dev->phydev);
477 }
478
479 static int r6040_close(struct net_device *dev)
480 {
481 struct r6040_private *lp = netdev_priv(dev);
482 struct pci_dev *pdev = lp->pdev;
483
484 spin_lock_irq(&lp->lock);
485 napi_disable(&lp->napi);
486 netif_stop_queue(dev);
487 r6040_down(dev);
488
489 free_irq(dev->irq, dev);
490
491 /* Free RX buffer */
492 r6040_free_rxbufs(dev);
493
494 /* Free TX buffer */
495 r6040_free_txbufs(dev);
496
497 spin_unlock_irq(&lp->lock);
498
499 /* Free Descriptor memory */
500 if (lp->rx_ring) {
501 pci_free_consistent(pdev,
502 RX_DESC_SIZE, lp->rx_ring, lp->rx_ring_dma);
503 lp->rx_ring = NULL;
504 }
505
506 if (lp->tx_ring) {
507 pci_free_consistent(pdev,
508 TX_DESC_SIZE, lp->tx_ring, lp->tx_ring_dma);
509 lp->tx_ring = NULL;
510 }
511
512 return 0;
513 }
514
515 static int r6040_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
516 {
517 if (!dev->phydev)
518 return -EINVAL;
519
520 return phy_mii_ioctl(dev->phydev, rq, cmd);
521 }
522
523 static int r6040_rx(struct net_device *dev, int limit)
524 {
525 struct r6040_private *priv = netdev_priv(dev);
526 struct r6040_descriptor *descptr = priv->rx_remove_ptr;
527 struct sk_buff *skb_ptr, *new_skb;
528 int count = 0;
529 u16 err;
530
531 /* Limit not reached and the descriptor belongs to the CPU */
532 while (count < limit && !(descptr->status & DSC_OWNER_MAC)) {
533 /* Read the descriptor status */
534 err = descptr->status;
535 /* Global error status set */
536 if (err & DSC_RX_ERR) {
537 /* RX dribble */
538 if (err & DSC_RX_ERR_DRI)
539 dev->stats.rx_frame_errors++;
540 /* Buffer length exceeded */
541 if (err & DSC_RX_ERR_BUF)
542 dev->stats.rx_length_errors++;
543 /* Packet too long */
544 if (err & DSC_RX_ERR_LONG)
545 dev->stats.rx_length_errors++;
546 /* Packet < 64 bytes */
547 if (err & DSC_RX_ERR_RUNT)
548 dev->stats.rx_length_errors++;
549 /* CRC error */
550 if (err & DSC_RX_ERR_CRC) {
551 spin_lock(&priv->lock);
552 dev->stats.rx_crc_errors++;
553 spin_unlock(&priv->lock);
554 }
555 goto next_descr;
556 }
557
558 /* Packet successfully received */
559 new_skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
560 if (!new_skb) {
561 dev->stats.rx_dropped++;
562 goto next_descr;
563 }
564 skb_ptr = descptr->skb_ptr;
565 skb_ptr->dev = priv->dev;
566
567 /* Do not count the CRC */
568 skb_put(skb_ptr, descptr->len - 4);
569 pci_unmap_single(priv->pdev, le32_to_cpu(descptr->buf),
570 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
571 skb_ptr->protocol = eth_type_trans(skb_ptr, priv->dev);
572
573 /* Send to upper layer */
574 netif_receive_skb(skb_ptr);
575 dev->stats.rx_packets++;
576 dev->stats.rx_bytes += descptr->len - 4;
577
578 /* put new skb into descriptor */
579 descptr->skb_ptr = new_skb;
580 descptr->buf = cpu_to_le32(pci_map_single(priv->pdev,
581 descptr->skb_ptr->data,
582 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE));
583
584 next_descr:
585 /* put the descriptor back to the MAC */
586 descptr->status = DSC_OWNER_MAC;
587 descptr = descptr->vndescp;
588 count++;
589 }
590 priv->rx_remove_ptr = descptr;
591
592 return count;
593 }
594
595 static void r6040_tx(struct net_device *dev)
596 {
597 struct r6040_private *priv = netdev_priv(dev);
598 struct r6040_descriptor *descptr;
599 void __iomem *ioaddr = priv->base;
600 struct sk_buff *skb_ptr;
601 u16 err;
602
603 spin_lock(&priv->lock);
604 descptr = priv->tx_remove_ptr;
605 while (priv->tx_free_desc < TX_DCNT) {
606 /* Check for errors */
607 err = ioread16(ioaddr + MLSR);
608
609 if (err & TX_FIFO_UNDR)
610 dev->stats.tx_fifo_errors++;
611 if (err & (TX_EXCEEDC | TX_LATEC))
612 dev->stats.tx_carrier_errors++;
613
614 if (descptr->status & DSC_OWNER_MAC)
615 break; /* Not complete */
616 skb_ptr = descptr->skb_ptr;
617
618 /* Statistic Counter */
619 dev->stats.tx_packets++;
620 dev->stats.tx_bytes += skb_ptr->len;
621
622 pci_unmap_single(priv->pdev, le32_to_cpu(descptr->buf),
623 skb_ptr->len, PCI_DMA_TODEVICE);
624 /* Free buffer */
625 dev_kfree_skb(skb_ptr);
626 descptr->skb_ptr = NULL;
627 /* To next descriptor */
628 descptr = descptr->vndescp;
629 priv->tx_free_desc++;
630 }
631 priv->tx_remove_ptr = descptr;
632
633 if (priv->tx_free_desc)
634 netif_wake_queue(dev);
635 spin_unlock(&priv->lock);
636 }
637
638 static int r6040_poll(struct napi_struct *napi, int budget)
639 {
640 struct r6040_private *priv =
641 container_of(napi, struct r6040_private, napi);
642 struct net_device *dev = priv->dev;
643 void __iomem *ioaddr = priv->base;
644 int work_done;
645
646 r6040_tx(dev);
647
648 work_done = r6040_rx(dev, budget);
649
650 if (work_done < budget) {
651 napi_complete_done(napi, work_done);
652 /* Enable RX/TX interrupt */
653 iowrite16(ioread16(ioaddr + MIER) | RX_INTS | TX_INTS,
654 ioaddr + MIER);
655 }
656 return work_done;
657 }
658
659 /* The RDC interrupt handler. */
660 static irqreturn_t r6040_interrupt(int irq, void *dev_id)
661 {
662 struct net_device *dev = dev_id;
663 struct r6040_private *lp = netdev_priv(dev);
664 void __iomem *ioaddr = lp->base;
665 u16 misr, status;
666
667 /* Save MIER */
668 misr = ioread16(ioaddr + MIER);
669 /* Mask off RDC MAC interrupt */
670 iowrite16(MSK_INT, ioaddr + MIER);
671 /* Read MISR status and clear */
672 status = ioread16(ioaddr + MISR);
673
674 if (status == 0x0000 || status == 0xffff) {
675 /* Restore RDC MAC interrupt */
676 iowrite16(misr, ioaddr + MIER);
677 return IRQ_NONE;
678 }
679
680 /* RX interrupt request */
681 if (status & (RX_INTS | TX_INTS)) {
682 if (status & RX_NO_DESC) {
683 /* RX descriptor unavailable */
684 dev->stats.rx_dropped++;
685 dev->stats.rx_missed_errors++;
686 }
687 if (status & RX_FIFO_FULL)
688 dev->stats.rx_fifo_errors++;
689
690 if (likely(napi_schedule_prep(&lp->napi))) {
691 /* Mask off RX interrupt */
692 misr &= ~(RX_INTS | TX_INTS);
693 __napi_schedule_irqoff(&lp->napi);
694 }
695 }
696
697 /* Restore RDC MAC interrupt */
698 iowrite16(misr, ioaddr + MIER);
699
700 return IRQ_HANDLED;
701 }
702
703 #ifdef CONFIG_NET_POLL_CONTROLLER
704 static void r6040_poll_controller(struct net_device *dev)
705 {
706 disable_irq(dev->irq);
707 r6040_interrupt(dev->irq, dev);
708 enable_irq(dev->irq);
709 }
710 #endif
711
712 /* Init RDC MAC */
713 static int r6040_up(struct net_device *dev)
714 {
715 struct r6040_private *lp = netdev_priv(dev);
716 void __iomem *ioaddr = lp->base;
717 int ret;
718
719 /* Initialise and alloc RX/TX buffers */
720 r6040_init_txbufs(dev);
721 ret = r6040_alloc_rxbufs(dev);
722 if (ret)
723 return ret;
724
725 /* improve performance (by RDC guys) */
726 r6040_phy_write(ioaddr, 30, 17,
727 (r6040_phy_read(ioaddr, 30, 17) | 0x4000));
728 r6040_phy_write(ioaddr, 30, 17,
729 ~((~r6040_phy_read(ioaddr, 30, 17)) | 0x2000));
730 r6040_phy_write(ioaddr, 0, 19, 0x0000);
731 r6040_phy_write(ioaddr, 0, 30, 0x01F0);
732
733 /* Initialize all MAC registers */
734 r6040_init_mac_regs(dev);
735
736 phy_start(dev->phydev);
737
738 return 0;
739 }
740
741
742 /* Read/set MAC address routines */
743 static void r6040_mac_address(struct net_device *dev)
744 {
745 struct r6040_private *lp = netdev_priv(dev);
746 void __iomem *ioaddr = lp->base;
747 u16 *adrp;
748
749 /* Reset MAC */
750 r6040_reset_mac(lp);
751
752 /* Restore MAC Address */
753 adrp = (u16 *) dev->dev_addr;
754 iowrite16(adrp[0], ioaddr + MID_0L);
755 iowrite16(adrp[1], ioaddr + MID_0M);
756 iowrite16(adrp[2], ioaddr + MID_0H);
757 }
758
759 static int r6040_open(struct net_device *dev)
760 {
761 struct r6040_private *lp = netdev_priv(dev);
762 int ret;
763
764 /* Request IRQ and Register interrupt handler */
765 ret = request_irq(dev->irq, r6040_interrupt,
766 IRQF_SHARED, dev->name, dev);
767 if (ret)
768 goto out;
769
770 /* Set MAC address */
771 r6040_mac_address(dev);
772
773 /* Allocate Descriptor memory */
774 lp->rx_ring =
775 pci_alloc_consistent(lp->pdev, RX_DESC_SIZE, &lp->rx_ring_dma);
776 if (!lp->rx_ring) {
777 ret = -ENOMEM;
778 goto err_free_irq;
779 }
780
781 lp->tx_ring =
782 pci_alloc_consistent(lp->pdev, TX_DESC_SIZE, &lp->tx_ring_dma);
783 if (!lp->tx_ring) {
784 ret = -ENOMEM;
785 goto err_free_rx_ring;
786 }
787
788 ret = r6040_up(dev);
789 if (ret)
790 goto err_free_tx_ring;
791
792 napi_enable(&lp->napi);
793 netif_start_queue(dev);
794
795 return 0;
796
797 err_free_tx_ring:
798 pci_free_consistent(lp->pdev, TX_DESC_SIZE, lp->tx_ring,
799 lp->tx_ring_dma);
800 err_free_rx_ring:
801 pci_free_consistent(lp->pdev, RX_DESC_SIZE, lp->rx_ring,
802 lp->rx_ring_dma);
803 err_free_irq:
804 free_irq(dev->irq, dev);
805 out:
806 return ret;
807 }
808
809 static netdev_tx_t r6040_start_xmit(struct sk_buff *skb,
810 struct net_device *dev)
811 {
812 struct r6040_private *lp = netdev_priv(dev);
813 struct r6040_descriptor *descptr;
814 void __iomem *ioaddr = lp->base;
815 unsigned long flags;
816
817 if (skb_put_padto(skb, ETH_ZLEN) < 0)
818 return NETDEV_TX_OK;
819
820 /* Critical Section */
821 spin_lock_irqsave(&lp->lock, flags);
822
823 /* TX resource check */
824 if (!lp->tx_free_desc) {
825 spin_unlock_irqrestore(&lp->lock, flags);
826 netif_stop_queue(dev);
827 netdev_err(dev, ": no tx descriptor\n");
828 return NETDEV_TX_BUSY;
829 }
830
831 /* Set TX descriptor & Transmit it */
832 lp->tx_free_desc--;
833 descptr = lp->tx_insert_ptr;
834 descptr->len = skb->len;
835 descptr->skb_ptr = skb;
836 descptr->buf = cpu_to_le32(pci_map_single(lp->pdev,
837 skb->data, skb->len, PCI_DMA_TODEVICE));
838 descptr->status = DSC_OWNER_MAC;
839
840 skb_tx_timestamp(skb);
841
842 /* Trigger the MAC to check the TX descriptor */
843 if (!skb->xmit_more || netif_queue_stopped(dev))
844 iowrite16(TM2TX, ioaddr + MTPR);
845 lp->tx_insert_ptr = descptr->vndescp;
846
847 /* If no tx resource, stop */
848 if (!lp->tx_free_desc)
849 netif_stop_queue(dev);
850
851 spin_unlock_irqrestore(&lp->lock, flags);
852
853 return NETDEV_TX_OK;
854 }
855
856 static void r6040_multicast_list(struct net_device *dev)
857 {
858 struct r6040_private *lp = netdev_priv(dev);
859 void __iomem *ioaddr = lp->base;
860 unsigned long flags;
861 struct netdev_hw_addr *ha;
862 int i;
863 u16 *adrp;
864 u16 hash_table[4] = { 0 };
865
866 spin_lock_irqsave(&lp->lock, flags);
867
868 /* Keep our MAC Address */
869 adrp = (u16 *)dev->dev_addr;
870 iowrite16(adrp[0], ioaddr + MID_0L);
871 iowrite16(adrp[1], ioaddr + MID_0M);
872 iowrite16(adrp[2], ioaddr + MID_0H);
873
874 /* Clear AMCP & PROM bits */
875 lp->mcr0 = ioread16(ioaddr + MCR0) & ~(MCR0_PROMISC | MCR0_HASH_EN);
876
877 /* Promiscuous mode */
878 if (dev->flags & IFF_PROMISC)
879 lp->mcr0 |= MCR0_PROMISC;
880
881 /* Enable multicast hash table function to
882 * receive all multicast packets. */
883 else if (dev->flags & IFF_ALLMULTI) {
884 lp->mcr0 |= MCR0_HASH_EN;
885
886 for (i = 0; i < MCAST_MAX ; i++) {
887 iowrite16(0, ioaddr + MID_1L + 8 * i);
888 iowrite16(0, ioaddr + MID_1M + 8 * i);
889 iowrite16(0, ioaddr + MID_1H + 8 * i);
890 }
891
892 for (i = 0; i < 4; i++)
893 hash_table[i] = 0xffff;
894 }
895 /* Use internal multicast address registers if the number of
896 * multicast addresses is not greater than MCAST_MAX. */
897 else if (netdev_mc_count(dev) <= MCAST_MAX) {
898 i = 0;
899 netdev_for_each_mc_addr(ha, dev) {
900 u16 *adrp = (u16 *) ha->addr;
901 iowrite16(adrp[0], ioaddr + MID_1L + 8 * i);
902 iowrite16(adrp[1], ioaddr + MID_1M + 8 * i);
903 iowrite16(adrp[2], ioaddr + MID_1H + 8 * i);
904 i++;
905 }
906 while (i < MCAST_MAX) {
907 iowrite16(0, ioaddr + MID_1L + 8 * i);
908 iowrite16(0, ioaddr + MID_1M + 8 * i);
909 iowrite16(0, ioaddr + MID_1H + 8 * i);
910 i++;
911 }
912 }
913 /* Otherwise, Enable multicast hash table function. */
914 else {
915 u32 crc;
916
917 lp->mcr0 |= MCR0_HASH_EN;
918
919 for (i = 0; i < MCAST_MAX ; i++) {
920 iowrite16(0, ioaddr + MID_1L + 8 * i);
921 iowrite16(0, ioaddr + MID_1M + 8 * i);
922 iowrite16(0, ioaddr + MID_1H + 8 * i);
923 }
924
925 /* Build multicast hash table */
926 netdev_for_each_mc_addr(ha, dev) {
927 u8 *addrs = ha->addr;
928
929 crc = ether_crc(ETH_ALEN, addrs);
930 crc >>= 26;
931 hash_table[crc >> 4] |= 1 << (crc & 0xf);
932 }
933 }
934
935 iowrite16(lp->mcr0, ioaddr + MCR0);
936
937 /* Fill the MAC hash tables with their values */
938 if (lp->mcr0 & MCR0_HASH_EN) {
939 iowrite16(hash_table[0], ioaddr + MAR0);
940 iowrite16(hash_table[1], ioaddr + MAR1);
941 iowrite16(hash_table[2], ioaddr + MAR2);
942 iowrite16(hash_table[3], ioaddr + MAR3);
943 }
944
945 spin_unlock_irqrestore(&lp->lock, flags);
946 }
947
948 static void netdev_get_drvinfo(struct net_device *dev,
949 struct ethtool_drvinfo *info)
950 {
951 struct r6040_private *rp = netdev_priv(dev);
952
953 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
954 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
955 strlcpy(info->bus_info, pci_name(rp->pdev), sizeof(info->bus_info));
956 }
957
958 static const struct ethtool_ops netdev_ethtool_ops = {
959 .get_drvinfo = netdev_get_drvinfo,
960 .get_link = ethtool_op_get_link,
961 .get_ts_info = ethtool_op_get_ts_info,
962 .get_link_ksettings = phy_ethtool_get_link_ksettings,
963 .set_link_ksettings = phy_ethtool_set_link_ksettings,
964 };
965
966 static const struct net_device_ops r6040_netdev_ops = {
967 .ndo_open = r6040_open,
968 .ndo_stop = r6040_close,
969 .ndo_start_xmit = r6040_start_xmit,
970 .ndo_get_stats = r6040_get_stats,
971 .ndo_set_rx_mode = r6040_multicast_list,
972 .ndo_change_mtu = eth_change_mtu,
973 .ndo_validate_addr = eth_validate_addr,
974 .ndo_set_mac_address = eth_mac_addr,
975 .ndo_do_ioctl = r6040_ioctl,
976 .ndo_tx_timeout = r6040_tx_timeout,
977 #ifdef CONFIG_NET_POLL_CONTROLLER
978 .ndo_poll_controller = r6040_poll_controller,
979 #endif
980 };
981
982 static void r6040_adjust_link(struct net_device *dev)
983 {
984 struct r6040_private *lp = netdev_priv(dev);
985 struct phy_device *phydev = dev->phydev;
986 int status_changed = 0;
987 void __iomem *ioaddr = lp->base;
988
989 BUG_ON(!phydev);
990
991 if (lp->old_link != phydev->link) {
992 status_changed = 1;
993 lp->old_link = phydev->link;
994 }
995
996 /* reflect duplex change */
997 if (phydev->link && (lp->old_duplex != phydev->duplex)) {
998 lp->mcr0 |= (phydev->duplex == DUPLEX_FULL ? MCR0_FD : 0);
999 iowrite16(lp->mcr0, ioaddr);
1000
1001 status_changed = 1;
1002 lp->old_duplex = phydev->duplex;
1003 }
1004
1005 if (status_changed)
1006 phy_print_status(phydev);
1007 }
1008
1009 static int r6040_mii_probe(struct net_device *dev)
1010 {
1011 struct r6040_private *lp = netdev_priv(dev);
1012 struct phy_device *phydev = NULL;
1013
1014 phydev = phy_find_first(lp->mii_bus);
1015 if (!phydev) {
1016 dev_err(&lp->pdev->dev, "no PHY found\n");
1017 return -ENODEV;
1018 }
1019
1020 phydev = phy_connect(dev, phydev_name(phydev), &r6040_adjust_link,
1021 PHY_INTERFACE_MODE_MII);
1022
1023 if (IS_ERR(phydev)) {
1024 dev_err(&lp->pdev->dev, "could not attach to PHY\n");
1025 return PTR_ERR(phydev);
1026 }
1027
1028 /* mask with MAC supported features */
1029 phydev->supported &= (SUPPORTED_10baseT_Half
1030 | SUPPORTED_10baseT_Full
1031 | SUPPORTED_100baseT_Half
1032 | SUPPORTED_100baseT_Full
1033 | SUPPORTED_Autoneg
1034 | SUPPORTED_MII
1035 | SUPPORTED_TP);
1036
1037 phydev->advertising = phydev->supported;
1038 lp->old_link = 0;
1039 lp->old_duplex = -1;
1040
1041 phy_attached_info(phydev);
1042
1043 return 0;
1044 }
1045
1046 static int r6040_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
1047 {
1048 struct net_device *dev;
1049 struct r6040_private *lp;
1050 void __iomem *ioaddr;
1051 int err, io_size = R6040_IO_SIZE;
1052 static int card_idx = -1;
1053 int bar = 0;
1054 u16 *adrp;
1055
1056 pr_info("%s\n", version);
1057
1058 err = pci_enable_device(pdev);
1059 if (err)
1060 goto err_out;
1061
1062 /* this should always be supported */
1063 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1064 if (err) {
1065 dev_err(&pdev->dev, "32-bit PCI DMA addresses"
1066 "not supported by the card\n");
1067 goto err_out_disable_dev;
1068 }
1069 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
1070 if (err) {
1071 dev_err(&pdev->dev, "32-bit PCI DMA addresses"
1072 "not supported by the card\n");
1073 goto err_out_disable_dev;
1074 }
1075
1076 /* IO Size check */
1077 if (pci_resource_len(pdev, bar) < io_size) {
1078 dev_err(&pdev->dev, "Insufficient PCI resources, aborting\n");
1079 err = -EIO;
1080 goto err_out_disable_dev;
1081 }
1082
1083 pci_set_master(pdev);
1084
1085 dev = alloc_etherdev(sizeof(struct r6040_private));
1086 if (!dev) {
1087 err = -ENOMEM;
1088 goto err_out_disable_dev;
1089 }
1090 SET_NETDEV_DEV(dev, &pdev->dev);
1091 lp = netdev_priv(dev);
1092
1093 err = pci_request_regions(pdev, DRV_NAME);
1094
1095 if (err) {
1096 dev_err(&pdev->dev, "Failed to request PCI regions\n");
1097 goto err_out_free_dev;
1098 }
1099
1100 ioaddr = pci_iomap(pdev, bar, io_size);
1101 if (!ioaddr) {
1102 dev_err(&pdev->dev, "ioremap failed for device\n");
1103 err = -EIO;
1104 goto err_out_free_res;
1105 }
1106
1107 /* If PHY status change register is still set to zero it means the
1108 * bootloader didn't initialize it, so we set it to:
1109 * - enable phy status change
1110 * - enable all phy addresses
1111 * - set to lowest timer divider */
1112 if (ioread16(ioaddr + PHY_CC) == 0)
1113 iowrite16(SCEN | PHY_MAX_ADDR << PHYAD_SHIFT |
1114 7 << TMRDIV_SHIFT, ioaddr + PHY_CC);
1115
1116 /* Init system & device */
1117 lp->base = ioaddr;
1118 dev->irq = pdev->irq;
1119
1120 spin_lock_init(&lp->lock);
1121 pci_set_drvdata(pdev, dev);
1122
1123 /* Set MAC address */
1124 card_idx++;
1125
1126 adrp = (u16 *)dev->dev_addr;
1127 adrp[0] = ioread16(ioaddr + MID_0L);
1128 adrp[1] = ioread16(ioaddr + MID_0M);
1129 adrp[2] = ioread16(ioaddr + MID_0H);
1130
1131 /* Some bootloader/BIOSes do not initialize
1132 * MAC address, warn about that */
1133 if (!(adrp[0] || adrp[1] || adrp[2])) {
1134 netdev_warn(dev, "MAC address not initialized, "
1135 "generating random\n");
1136 eth_hw_addr_random(dev);
1137 }
1138
1139 /* Link new device into r6040_root_dev */
1140 lp->pdev = pdev;
1141 lp->dev = dev;
1142
1143 /* Init RDC private data */
1144 lp->mcr0 = MCR0_XMTEN | MCR0_RCVEN;
1145
1146 /* The RDC-specific entries in the device structure. */
1147 dev->netdev_ops = &r6040_netdev_ops;
1148 dev->ethtool_ops = &netdev_ethtool_ops;
1149 dev->watchdog_timeo = TX_TIMEOUT;
1150
1151 netif_napi_add(dev, &lp->napi, r6040_poll, 64);
1152
1153 lp->mii_bus = mdiobus_alloc();
1154 if (!lp->mii_bus) {
1155 dev_err(&pdev->dev, "mdiobus_alloc() failed\n");
1156 err = -ENOMEM;
1157 goto err_out_unmap;
1158 }
1159
1160 lp->mii_bus->priv = dev;
1161 lp->mii_bus->read = r6040_mdiobus_read;
1162 lp->mii_bus->write = r6040_mdiobus_write;
1163 lp->mii_bus->name = "r6040_eth_mii";
1164 snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
1165 dev_name(&pdev->dev), card_idx);
1166
1167 err = mdiobus_register(lp->mii_bus);
1168 if (err) {
1169 dev_err(&pdev->dev, "failed to register MII bus\n");
1170 goto err_out_mdio;
1171 }
1172
1173 err = r6040_mii_probe(dev);
1174 if (err) {
1175 dev_err(&pdev->dev, "failed to probe MII bus\n");
1176 goto err_out_mdio_unregister;
1177 }
1178
1179 /* Register net device. After this dev->name assign */
1180 err = register_netdev(dev);
1181 if (err) {
1182 dev_err(&pdev->dev, "Failed to register net device\n");
1183 goto err_out_mdio_unregister;
1184 }
1185 return 0;
1186
1187 err_out_mdio_unregister:
1188 mdiobus_unregister(lp->mii_bus);
1189 err_out_mdio:
1190 mdiobus_free(lp->mii_bus);
1191 err_out_unmap:
1192 netif_napi_del(&lp->napi);
1193 pci_iounmap(pdev, ioaddr);
1194 err_out_free_res:
1195 pci_release_regions(pdev);
1196 err_out_free_dev:
1197 free_netdev(dev);
1198 err_out_disable_dev:
1199 pci_disable_device(pdev);
1200 err_out:
1201 return err;
1202 }
1203
1204 static void r6040_remove_one(struct pci_dev *pdev)
1205 {
1206 struct net_device *dev = pci_get_drvdata(pdev);
1207 struct r6040_private *lp = netdev_priv(dev);
1208
1209 unregister_netdev(dev);
1210 mdiobus_unregister(lp->mii_bus);
1211 mdiobus_free(lp->mii_bus);
1212 netif_napi_del(&lp->napi);
1213 pci_iounmap(pdev, lp->base);
1214 pci_release_regions(pdev);
1215 free_netdev(dev);
1216 pci_disable_device(pdev);
1217 }
1218
1219
1220 static const struct pci_device_id r6040_pci_tbl[] = {
1221 { PCI_DEVICE(PCI_VENDOR_ID_RDC, 0x6040) },
1222 { 0 }
1223 };
1224 MODULE_DEVICE_TABLE(pci, r6040_pci_tbl);
1225
1226 static struct pci_driver r6040_driver = {
1227 .name = DRV_NAME,
1228 .id_table = r6040_pci_tbl,
1229 .probe = r6040_init_one,
1230 .remove = r6040_remove_one,
1231 };
1232
1233 module_pci_driver(r6040_driver);
Linux kernel - Deliverables
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