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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
[deliverable/linux.git] / drivers / net / 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 * 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/slab.h>
33 #include <linux/interrupt.h>
34 #include <linux/pci.h>
35 #include <linux/netdevice.h>
36 #include <linux/etherdevice.h>
37 #include <linux/skbuff.h>
38 #include <linux/init.h>
39 #include <linux/delay.h>
40 #include <linux/mii.h>
41 #include <linux/ethtool.h>
42 #include <linux/crc32.h>
43 #include <linux/spinlock.h>
44 #include <linux/bitops.h>
45 #include <linux/io.h>
46 #include <linux/irq.h>
47 #include <linux/uaccess.h>
48
49 #include <asm/processor.h>
50
51 #define DRV_NAME "r6040"
52 #define DRV_VERSION "0.18"
53 #define DRV_RELDATE "13Jul2008"
54
55 /* PHY CHIP Address */
56 #define PHY1_ADDR 1 /* For MAC1 */
57 #define PHY2_ADDR 2 /* For MAC2 */
58 #define PHY_MODE 0x3100 /* PHY CHIP Register 0 */
59 #define PHY_CAP 0x01E1 /* PHY CHIP Register 4 */
60
61 /* Time in jiffies before concluding the transmitter is hung. */
62 #define TX_TIMEOUT (6000 * HZ / 1000)
63
64 /* RDC MAC I/O Size */
65 #define R6040_IO_SIZE 256
66
67 /* MAX RDC MAC */
68 #define MAX_MAC 2
69
70 /* MAC registers */
71 #define MCR0 0x00 /* Control register 0 */
72 #define MCR1 0x04 /* Control register 1 */
73 #define MAC_RST 0x0001 /* Reset the MAC */
74 #define MBCR 0x08 /* Bus control */
75 #define MT_ICR 0x0C /* TX interrupt control */
76 #define MR_ICR 0x10 /* RX interrupt control */
77 #define MTPR 0x14 /* TX poll command register */
78 #define MR_BSR 0x18 /* RX buffer size */
79 #define MR_DCR 0x1A /* RX descriptor control */
80 #define MLSR 0x1C /* Last status */
81 #define MMDIO 0x20 /* MDIO control register */
82 #define MDIO_WRITE 0x4000 /* MDIO write */
83 #define MDIO_READ 0x2000 /* MDIO read */
84 #define MMRD 0x24 /* MDIO read data register */
85 #define MMWD 0x28 /* MDIO write data register */
86 #define MTD_SA0 0x2C /* TX descriptor start address 0 */
87 #define MTD_SA1 0x30 /* TX descriptor start address 1 */
88 #define MRD_SA0 0x34 /* RX descriptor start address 0 */
89 #define MRD_SA1 0x38 /* RX descriptor start address 1 */
90 #define MISR 0x3C /* Status register */
91 #define MIER 0x40 /* INT enable register */
92 #define MSK_INT 0x0000 /* Mask off interrupts */
93 #define RX_FINISH 0x0001 /* RX finished */
94 #define RX_NO_DESC 0x0002 /* No RX descriptor available */
95 #define RX_FIFO_FULL 0x0004 /* RX FIFO full */
96 #define RX_EARLY 0x0008 /* RX early */
97 #define TX_FINISH 0x0010 /* TX finished */
98 #define TX_EARLY 0x0080 /* TX early */
99 #define EVENT_OVRFL 0x0100 /* Event counter overflow */
100 #define LINK_CHANGED 0x0200 /* PHY link changed */
101 #define ME_CISR 0x44 /* Event counter INT status */
102 #define ME_CIER 0x48 /* Event counter INT enable */
103 #define MR_CNT 0x50 /* Successfully received packet counter */
104 #define ME_CNT0 0x52 /* Event counter 0 */
105 #define ME_CNT1 0x54 /* Event counter 1 */
106 #define ME_CNT2 0x56 /* Event counter 2 */
107 #define ME_CNT3 0x58 /* Event counter 3 */
108 #define MT_CNT 0x5A /* Successfully transmit packet counter */
109 #define ME_CNT4 0x5C /* Event counter 4 */
110 #define MP_CNT 0x5E /* Pause frame counter register */
111 #define MAR0 0x60 /* Hash table 0 */
112 #define MAR1 0x62 /* Hash table 1 */
113 #define MAR2 0x64 /* Hash table 2 */
114 #define MAR3 0x66 /* Hash table 3 */
115 #define MID_0L 0x68 /* Multicast address MID0 Low */
116 #define MID_0M 0x6A /* Multicast address MID0 Medium */
117 #define MID_0H 0x6C /* Multicast address MID0 High */
118 #define MID_1L 0x70 /* MID1 Low */
119 #define MID_1M 0x72 /* MID1 Medium */
120 #define MID_1H 0x74 /* MID1 High */
121 #define MID_2L 0x78 /* MID2 Low */
122 #define MID_2M 0x7A /* MID2 Medium */
123 #define MID_2H 0x7C /* MID2 High */
124 #define MID_3L 0x80 /* MID3 Low */
125 #define MID_3M 0x82 /* MID3 Medium */
126 #define MID_3H 0x84 /* MID3 High */
127 #define PHY_CC 0x88 /* PHY status change configuration register */
128 #define PHY_ST 0x8A /* PHY status register */
129 #define MAC_SM 0xAC /* MAC status machine */
130 #define MAC_ID 0xBE /* Identifier register */
131
132 #define TX_DCNT 0x80 /* TX descriptor count */
133 #define RX_DCNT 0x80 /* RX descriptor count */
134 #define MAX_BUF_SIZE 0x600
135 #define RX_DESC_SIZE (RX_DCNT * sizeof(struct r6040_descriptor))
136 #define TX_DESC_SIZE (TX_DCNT * sizeof(struct r6040_descriptor))
137 #define MBCR_DEFAULT 0x012A /* MAC Bus Control Register */
138 #define MCAST_MAX 4 /* Max number multicast addresses to filter */
139
140 /* Descriptor status */
141 #define DSC_OWNER_MAC 0x8000 /* MAC is the owner of this descriptor */
142 #define DSC_RX_OK 0x4000 /* RX was successful */
143 #define DSC_RX_ERR 0x0800 /* RX PHY error */
144 #define DSC_RX_ERR_DRI 0x0400 /* RX dribble packet */
145 #define DSC_RX_ERR_BUF 0x0200 /* RX length exceeds buffer size */
146 #define DSC_RX_ERR_LONG 0x0100 /* RX length > maximum packet length */
147 #define DSC_RX_ERR_RUNT 0x0080 /* RX packet length < 64 byte */
148 #define DSC_RX_ERR_CRC 0x0040 /* RX CRC error */
149 #define DSC_RX_BCAST 0x0020 /* RX broadcast (no error) */
150 #define DSC_RX_MCAST 0x0010 /* RX multicast (no error) */
151 #define DSC_RX_MCH_HIT 0x0008 /* RX multicast hit in hash table (no error) */
152 #define DSC_RX_MIDH_HIT 0x0004 /* RX MID table hit (no error) */
153 #define DSC_RX_IDX_MID_MASK 3 /* RX mask for the index of matched MIDx */
154
155 /* PHY settings */
156 #define ICPLUS_PHY_ID 0x0243
157
158 MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>,"
159 "Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,"
160 "Florian Fainelli <florian@openwrt.org>");
161 MODULE_LICENSE("GPL");
162 MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver");
163
164 /* RX and TX interrupts that we handle */
165 #define RX_INTS (RX_FIFO_FULL | RX_NO_DESC | RX_FINISH)
166 #define TX_INTS (TX_FINISH)
167 #define INT_MASK (RX_INTS | TX_INTS)
168
169 struct r6040_descriptor {
170 u16 status, len; /* 0-3 */
171 __le32 buf; /* 4-7 */
172 __le32 ndesc; /* 8-B */
173 u32 rev1; /* C-F */
174 char *vbufp; /* 10-13 */
175 struct r6040_descriptor *vndescp; /* 14-17 */
176 struct sk_buff *skb_ptr; /* 18-1B */
177 u32 rev2; /* 1C-1F */
178 } __attribute__((aligned(32)));
179
180 struct r6040_private {
181 spinlock_t lock; /* driver lock */
182 struct timer_list timer;
183 struct pci_dev *pdev;
184 struct r6040_descriptor *rx_insert_ptr;
185 struct r6040_descriptor *rx_remove_ptr;
186 struct r6040_descriptor *tx_insert_ptr;
187 struct r6040_descriptor *tx_remove_ptr;
188 struct r6040_descriptor *rx_ring;
189 struct r6040_descriptor *tx_ring;
190 dma_addr_t rx_ring_dma;
191 dma_addr_t tx_ring_dma;
192 u16 tx_free_desc, phy_addr, phy_mode;
193 u16 mcr0, mcr1;
194 u16 switch_sig;
195 struct net_device *dev;
196 struct mii_if_info mii_if;
197 struct napi_struct napi;
198 void __iomem *base;
199 };
200
201 static char version[] __devinitdata = KERN_INFO DRV_NAME
202 ": RDC R6040 NAPI net driver,"
203 "version "DRV_VERSION " (" DRV_RELDATE ")\n";
204
205 static int phy_table[] = { PHY1_ADDR, PHY2_ADDR };
206
207 /* Read a word data from PHY Chip */
208 static int r6040_phy_read(void __iomem *ioaddr, int phy_addr, int reg)
209 {
210 int limit = 2048;
211 u16 cmd;
212
213 iowrite16(MDIO_READ + reg + (phy_addr << 8), ioaddr + MMDIO);
214 /* Wait for the read bit to be cleared */
215 while (limit--) {
216 cmd = ioread16(ioaddr + MMDIO);
217 if (cmd & MDIO_READ)
218 break;
219 }
220
221 return ioread16(ioaddr + MMRD);
222 }
223
224 /* Write a word data from PHY Chip */
225 static void r6040_phy_write(void __iomem *ioaddr, int phy_addr, int reg, u16 val)
226 {
227 int limit = 2048;
228 u16 cmd;
229
230 iowrite16(val, ioaddr + MMWD);
231 /* Write the command to the MDIO bus */
232 iowrite16(MDIO_WRITE + reg + (phy_addr << 8), ioaddr + MMDIO);
233 /* Wait for the write bit to be cleared */
234 while (limit--) {
235 cmd = ioread16(ioaddr + MMDIO);
236 if (cmd & MDIO_WRITE)
237 break;
238 }
239 }
240
241 static int r6040_mdio_read(struct net_device *dev, int mii_id, int reg)
242 {
243 struct r6040_private *lp = netdev_priv(dev);
244 void __iomem *ioaddr = lp->base;
245
246 return (r6040_phy_read(ioaddr, lp->phy_addr, reg));
247 }
248
249 static void r6040_mdio_write(struct net_device *dev, int mii_id, int reg, int val)
250 {
251 struct r6040_private *lp = netdev_priv(dev);
252 void __iomem *ioaddr = lp->base;
253
254 r6040_phy_write(ioaddr, lp->phy_addr, reg, val);
255 }
256
257 static void r6040_free_txbufs(struct net_device *dev)
258 {
259 struct r6040_private *lp = netdev_priv(dev);
260 int i;
261
262 for (i = 0; i < TX_DCNT; i++) {
263 if (lp->tx_insert_ptr->skb_ptr) {
264 pci_unmap_single(lp->pdev,
265 le32_to_cpu(lp->tx_insert_ptr->buf),
266 MAX_BUF_SIZE, PCI_DMA_TODEVICE);
267 dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
268 lp->tx_insert_ptr->skb_ptr = NULL;
269 }
270 lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
271 }
272 }
273
274 static void r6040_free_rxbufs(struct net_device *dev)
275 {
276 struct r6040_private *lp = netdev_priv(dev);
277 int i;
278
279 for (i = 0; i < RX_DCNT; i++) {
280 if (lp->rx_insert_ptr->skb_ptr) {
281 pci_unmap_single(lp->pdev,
282 le32_to_cpu(lp->rx_insert_ptr->buf),
283 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
284 dev_kfree_skb(lp->rx_insert_ptr->skb_ptr);
285 lp->rx_insert_ptr->skb_ptr = NULL;
286 }
287 lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp;
288 }
289 }
290
291 static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring,
292 dma_addr_t desc_dma, int size)
293 {
294 struct r6040_descriptor *desc = desc_ring;
295 dma_addr_t mapping = desc_dma;
296
297 while (size-- > 0) {
298 mapping += sizeof(*desc);
299 desc->ndesc = cpu_to_le32(mapping);
300 desc->vndescp = desc + 1;
301 desc++;
302 }
303 desc--;
304 desc->ndesc = cpu_to_le32(desc_dma);
305 desc->vndescp = desc_ring;
306 }
307
308 static void r6040_init_txbufs(struct net_device *dev)
309 {
310 struct r6040_private *lp = netdev_priv(dev);
311
312 lp->tx_free_desc = TX_DCNT;
313
314 lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring;
315 r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT);
316 }
317
318 static int r6040_alloc_rxbufs(struct net_device *dev)
319 {
320 struct r6040_private *lp = netdev_priv(dev);
321 struct r6040_descriptor *desc;
322 struct sk_buff *skb;
323 int rc;
324
325 lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring;
326 r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT);
327
328 /* Allocate skbs for the rx descriptors */
329 desc = lp->rx_ring;
330 do {
331 skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
332 if (!skb) {
333 printk(KERN_ERR "%s: failed to alloc skb for rx\n", dev->name);
334 rc = -ENOMEM;
335 goto err_exit;
336 }
337 desc->skb_ptr = skb;
338 desc->buf = cpu_to_le32(pci_map_single(lp->pdev,
339 desc->skb_ptr->data,
340 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE));
341 desc->status = DSC_OWNER_MAC;
342 desc = desc->vndescp;
343 } while (desc != lp->rx_ring);
344
345 return 0;
346
347 err_exit:
348 /* Deallocate all previously allocated skbs */
349 r6040_free_rxbufs(dev);
350 return rc;
351 }
352
353 static void r6040_init_mac_regs(struct net_device *dev)
354 {
355 struct r6040_private *lp = netdev_priv(dev);
356 void __iomem *ioaddr = lp->base;
357 int limit = 2048;
358 u16 cmd;
359
360 /* Mask Off Interrupt */
361 iowrite16(MSK_INT, ioaddr + MIER);
362
363 /* Reset RDC MAC */
364 iowrite16(MAC_RST, ioaddr + MCR1);
365 while (limit--) {
366 cmd = ioread16(ioaddr + MCR1);
367 if (cmd & 0x1)
368 break;
369 }
370 /* Reset internal state machine */
371 iowrite16(2, ioaddr + MAC_SM);
372 iowrite16(0, ioaddr + MAC_SM);
373 mdelay(5);
374
375 /* MAC Bus Control Register */
376 iowrite16(MBCR_DEFAULT, ioaddr + MBCR);
377
378 /* Buffer Size Register */
379 iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR);
380
381 /* Write TX ring start address */
382 iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0);
383 iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1);
384
385 /* Write RX ring start address */
386 iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0);
387 iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1);
388
389 /* Set interrupt waiting time and packet numbers */
390 iowrite16(0, ioaddr + MT_ICR);
391 iowrite16(0, ioaddr + MR_ICR);
392
393 /* Enable interrupts */
394 iowrite16(INT_MASK, ioaddr + MIER);
395
396 /* Enable TX and RX */
397 iowrite16(lp->mcr0 | 0x0002, ioaddr);
398
399 /* Let TX poll the descriptors
400 * we may got called by r6040_tx_timeout which has left
401 * some unsent tx buffers */
402 iowrite16(0x01, ioaddr + MTPR);
403 }
404
405 static void r6040_tx_timeout(struct net_device *dev)
406 {
407 struct r6040_private *priv = netdev_priv(dev);
408 void __iomem *ioaddr = priv->base;
409
410 printk(KERN_WARNING "%s: transmit timed out, int enable %4.4x "
411 "status %4.4x, PHY status %4.4x\n",
412 dev->name, ioread16(ioaddr + MIER),
413 ioread16(ioaddr + MISR),
414 r6040_mdio_read(dev, priv->mii_if.phy_id, MII_BMSR));
415
416 dev->stats.tx_errors++;
417
418 /* Reset MAC and re-init all registers */
419 r6040_init_mac_regs(dev);
420 }
421
422 static struct net_device_stats *r6040_get_stats(struct net_device *dev)
423 {
424 struct r6040_private *priv = netdev_priv(dev);
425 void __iomem *ioaddr = priv->base;
426 unsigned long flags;
427
428 spin_lock_irqsave(&priv->lock, flags);
429 dev->stats.rx_crc_errors += ioread8(ioaddr + ME_CNT1);
430 dev->stats.multicast += ioread8(ioaddr + ME_CNT0);
431 spin_unlock_irqrestore(&priv->lock, flags);
432
433 return &dev->stats;
434 }
435
436 /* Stop RDC MAC and Free the allocated resource */
437 static void r6040_down(struct net_device *dev)
438 {
439 struct r6040_private *lp = netdev_priv(dev);
440 void __iomem *ioaddr = lp->base;
441 struct pci_dev *pdev = lp->pdev;
442 int limit = 2048;
443 u16 *adrp;
444 u16 cmd;
445
446 /* Stop MAC */
447 iowrite16(MSK_INT, ioaddr + MIER); /* Mask Off Interrupt */
448 iowrite16(MAC_RST, ioaddr + MCR1); /* Reset RDC MAC */
449 while (limit--) {
450 cmd = ioread16(ioaddr + MCR1);
451 if (cmd & 0x1)
452 break;
453 }
454
455 /* Restore MAC Address to MIDx */
456 adrp = (u16 *) dev->dev_addr;
457 iowrite16(adrp[0], ioaddr + MID_0L);
458 iowrite16(adrp[1], ioaddr + MID_0M);
459 iowrite16(adrp[2], ioaddr + MID_0H);
460 free_irq(dev->irq, dev);
461
462 /* Free RX buffer */
463 r6040_free_rxbufs(dev);
464
465 /* Free TX buffer */
466 r6040_free_txbufs(dev);
467
468 /* Free Descriptor memory */
469 pci_free_consistent(pdev, RX_DESC_SIZE, lp->rx_ring, lp->rx_ring_dma);
470 pci_free_consistent(pdev, TX_DESC_SIZE, lp->tx_ring, lp->tx_ring_dma);
471 }
472
473 static int r6040_close(struct net_device *dev)
474 {
475 struct r6040_private *lp = netdev_priv(dev);
476
477 /* deleted timer */
478 del_timer_sync(&lp->timer);
479
480 spin_lock_irq(&lp->lock);
481 napi_disable(&lp->napi);
482 netif_stop_queue(dev);
483 r6040_down(dev);
484 spin_unlock_irq(&lp->lock);
485
486 return 0;
487 }
488
489 /* Status of PHY CHIP */
490 static int r6040_phy_mode_chk(struct net_device *dev)
491 {
492 struct r6040_private *lp = netdev_priv(dev);
493 void __iomem *ioaddr = lp->base;
494 int phy_dat;
495
496 /* PHY Link Status Check */
497 phy_dat = r6040_phy_read(ioaddr, lp->phy_addr, 1);
498 if (!(phy_dat & 0x4))
499 phy_dat = 0x8000; /* Link Failed, full duplex */
500
501 /* PHY Chip Auto-Negotiation Status */
502 phy_dat = r6040_phy_read(ioaddr, lp->phy_addr, 1);
503 if (phy_dat & 0x0020) {
504 /* Auto Negotiation Mode */
505 phy_dat = r6040_phy_read(ioaddr, lp->phy_addr, 5);
506 phy_dat &= r6040_phy_read(ioaddr, lp->phy_addr, 4);
507 if (phy_dat & 0x140)
508 /* Force full duplex */
509 phy_dat = 0x8000;
510 else
511 phy_dat = 0;
512 } else {
513 /* Force Mode */
514 phy_dat = r6040_phy_read(ioaddr, lp->phy_addr, 0);
515 if (phy_dat & 0x100)
516 phy_dat = 0x8000;
517 else
518 phy_dat = 0x0000;
519 }
520
521 return phy_dat;
522 };
523
524 static void r6040_set_carrier(struct mii_if_info *mii)
525 {
526 if (r6040_phy_mode_chk(mii->dev)) {
527 /* autoneg is off: Link is always assumed to be up */
528 if (!netif_carrier_ok(mii->dev))
529 netif_carrier_on(mii->dev);
530 } else
531 r6040_phy_mode_chk(mii->dev);
532 }
533
534 static int r6040_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
535 {
536 struct r6040_private *lp = netdev_priv(dev);
537 struct mii_ioctl_data *data = if_mii(rq);
538 int rc;
539
540 if (!netif_running(dev))
541 return -EINVAL;
542 spin_lock_irq(&lp->lock);
543 rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
544 spin_unlock_irq(&lp->lock);
545 r6040_set_carrier(&lp->mii_if);
546 return rc;
547 }
548
549 static int r6040_rx(struct net_device *dev, int limit)
550 {
551 struct r6040_private *priv = netdev_priv(dev);
552 struct r6040_descriptor *descptr = priv->rx_remove_ptr;
553 struct sk_buff *skb_ptr, *new_skb;
554 int count = 0;
555 u16 err;
556
557 /* Limit not reached and the descriptor belongs to the CPU */
558 while (count < limit && !(descptr->status & DSC_OWNER_MAC)) {
559 /* Read the descriptor status */
560 err = descptr->status;
561 /* Global error status set */
562 if (err & DSC_RX_ERR) {
563 /* RX dribble */
564 if (err & DSC_RX_ERR_DRI)
565 dev->stats.rx_frame_errors++;
566 /* Buffer lenght exceeded */
567 if (err & DSC_RX_ERR_BUF)
568 dev->stats.rx_length_errors++;
569 /* Packet too long */
570 if (err & DSC_RX_ERR_LONG)
571 dev->stats.rx_length_errors++;
572 /* Packet < 64 bytes */
573 if (err & DSC_RX_ERR_RUNT)
574 dev->stats.rx_length_errors++;
575 /* CRC error */
576 if (err & DSC_RX_ERR_CRC) {
577 spin_lock(&priv->lock);
578 dev->stats.rx_crc_errors++;
579 spin_unlock(&priv->lock);
580 }
581 goto next_descr;
582 }
583
584 /* Packet successfully received */
585 new_skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
586 if (!new_skb) {
587 dev->stats.rx_dropped++;
588 goto next_descr;
589 }
590 skb_ptr = descptr->skb_ptr;
591 skb_ptr->dev = priv->dev;
592
593 /* Do not count the CRC */
594 skb_put(skb_ptr, descptr->len - 4);
595 pci_unmap_single(priv->pdev, le32_to_cpu(descptr->buf),
596 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
597 skb_ptr->protocol = eth_type_trans(skb_ptr, priv->dev);
598
599 /* Send to upper layer */
600 netif_receive_skb(skb_ptr);
601 dev->stats.rx_packets++;
602 dev->stats.rx_bytes += descptr->len - 4;
603
604 /* put new skb into descriptor */
605 descptr->skb_ptr = new_skb;
606 descptr->buf = cpu_to_le32(pci_map_single(priv->pdev,
607 descptr->skb_ptr->data,
608 MAX_BUF_SIZE, PCI_DMA_FROMDEVICE));
609
610 next_descr:
611 /* put the descriptor back to the MAC */
612 descptr->status = DSC_OWNER_MAC;
613 descptr = descptr->vndescp;
614 count++;
615 }
616 priv->rx_remove_ptr = descptr;
617
618 return count;
619 }
620
621 static void r6040_tx(struct net_device *dev)
622 {
623 struct r6040_private *priv = netdev_priv(dev);
624 struct r6040_descriptor *descptr;
625 void __iomem *ioaddr = priv->base;
626 struct sk_buff *skb_ptr;
627 u16 err;
628
629 spin_lock(&priv->lock);
630 descptr = priv->tx_remove_ptr;
631 while (priv->tx_free_desc < TX_DCNT) {
632 /* Check for errors */
633 err = ioread16(ioaddr + MLSR);
634
635 if (err & 0x0200)
636 dev->stats.rx_fifo_errors++;
637 if (err & (0x2000 | 0x4000))
638 dev->stats.tx_carrier_errors++;
639
640 if (descptr->status & DSC_OWNER_MAC)
641 break; /* Not complete */
642 skb_ptr = descptr->skb_ptr;
643 pci_unmap_single(priv->pdev, le32_to_cpu(descptr->buf),
644 skb_ptr->len, PCI_DMA_TODEVICE);
645 /* Free buffer */
646 dev_kfree_skb_irq(skb_ptr);
647 descptr->skb_ptr = NULL;
648 /* To next descriptor */
649 descptr = descptr->vndescp;
650 priv->tx_free_desc++;
651 }
652 priv->tx_remove_ptr = descptr;
653
654 if (priv->tx_free_desc)
655 netif_wake_queue(dev);
656 spin_unlock(&priv->lock);
657 }
658
659 static int r6040_poll(struct napi_struct *napi, int budget)
660 {
661 struct r6040_private *priv =
662 container_of(napi, struct r6040_private, napi);
663 struct net_device *dev = priv->dev;
664 void __iomem *ioaddr = priv->base;
665 int work_done;
666
667 work_done = r6040_rx(dev, budget);
668
669 if (work_done < budget) {
670 netif_rx_complete(dev, napi);
671 /* Enable RX interrupt */
672 iowrite16(ioread16(ioaddr + MIER) | RX_INTS, ioaddr + MIER);
673 }
674 return work_done;
675 }
676
677 /* The RDC interrupt handler. */
678 static irqreturn_t r6040_interrupt(int irq, void *dev_id)
679 {
680 struct net_device *dev = dev_id;
681 struct r6040_private *lp = netdev_priv(dev);
682 void __iomem *ioaddr = lp->base;
683 u16 status;
684
685 /* Mask off RDC MAC interrupt */
686 iowrite16(MSK_INT, ioaddr + MIER);
687 /* Read MISR status and clear */
688 status = ioread16(ioaddr + MISR);
689
690 if (status == 0x0000 || status == 0xffff)
691 return IRQ_NONE;
692
693 /* RX interrupt request */
694 if (status & RX_INTS) {
695 if (status & RX_NO_DESC) {
696 /* RX descriptor unavailable */
697 dev->stats.rx_dropped++;
698 dev->stats.rx_missed_errors++;
699 }
700 if (status & RX_FIFO_FULL)
701 dev->stats.rx_fifo_errors++;
702
703 /* Mask off RX interrupt */
704 iowrite16(ioread16(ioaddr + MIER) & ~RX_INTS, ioaddr + MIER);
705 netif_rx_schedule(dev, &lp->napi);
706 }
707
708 /* TX interrupt request */
709 if (status & TX_INTS)
710 r6040_tx(dev);
711
712 return IRQ_HANDLED;
713 }
714
715 #ifdef CONFIG_NET_POLL_CONTROLLER
716 static void r6040_poll_controller(struct net_device *dev)
717 {
718 disable_irq(dev->irq);
719 r6040_interrupt(dev->irq, dev);
720 enable_irq(dev->irq);
721 }
722 #endif
723
724 /* Init RDC MAC */
725 static int r6040_up(struct net_device *dev)
726 {
727 struct r6040_private *lp = netdev_priv(dev);
728 void __iomem *ioaddr = lp->base;
729 int ret;
730
731 /* Initialise and alloc RX/TX buffers */
732 r6040_init_txbufs(dev);
733 ret = r6040_alloc_rxbufs(dev);
734 if (ret)
735 return ret;
736
737 /* Read the PHY ID */
738 lp->switch_sig = r6040_phy_read(ioaddr, 0, 2);
739
740 if (lp->switch_sig == ICPLUS_PHY_ID) {
741 r6040_phy_write(ioaddr, 29, 31, 0x175C); /* Enable registers */
742 lp->phy_mode = 0x8000;
743 } else {
744 /* PHY Mode Check */
745 r6040_phy_write(ioaddr, lp->phy_addr, 4, PHY_CAP);
746 r6040_phy_write(ioaddr, lp->phy_addr, 0, PHY_MODE);
747
748 if (PHY_MODE == 0x3100)
749 lp->phy_mode = r6040_phy_mode_chk(dev);
750 else
751 lp->phy_mode = (PHY_MODE & 0x0100) ? 0x8000:0x0;
752 }
753
754 /* Set duplex mode */
755 lp->mcr0 |= lp->phy_mode;
756
757 /* improve performance (by RDC guys) */
758 r6040_phy_write(ioaddr, 30, 17, (r6040_phy_read(ioaddr, 30, 17) | 0x4000));
759 r6040_phy_write(ioaddr, 30, 17, ~((~r6040_phy_read(ioaddr, 30, 17)) | 0x2000));
760 r6040_phy_write(ioaddr, 0, 19, 0x0000);
761 r6040_phy_write(ioaddr, 0, 30, 0x01F0);
762
763 /* Initialize all MAC registers */
764 r6040_init_mac_regs(dev);
765
766 return 0;
767 }
768
769 /*
770 A periodic timer routine
771 Polling PHY Chip Link Status
772 */
773 static void r6040_timer(unsigned long data)
774 {
775 struct net_device *dev = (struct net_device *)data;
776 struct r6040_private *lp = netdev_priv(dev);
777 void __iomem *ioaddr = lp->base;
778 u16 phy_mode;
779
780 /* Polling PHY Chip Status */
781 if (PHY_MODE == 0x3100)
782 phy_mode = r6040_phy_mode_chk(dev);
783 else
784 phy_mode = (PHY_MODE & 0x0100) ? 0x8000:0x0;
785
786 if (phy_mode != lp->phy_mode) {
787 lp->phy_mode = phy_mode;
788 lp->mcr0 = (lp->mcr0 & 0x7fff) | phy_mode;
789 iowrite16(lp->mcr0, ioaddr);
790 printk(KERN_INFO "Link Change %x \n", ioread16(ioaddr));
791 }
792
793 /* Timer active again */
794 mod_timer(&lp->timer, round_jiffies(jiffies + HZ));
795 }
796
797 /* Read/set MAC address routines */
798 static void r6040_mac_address(struct net_device *dev)
799 {
800 struct r6040_private *lp = netdev_priv(dev);
801 void __iomem *ioaddr = lp->base;
802 u16 *adrp;
803
804 /* MAC operation register */
805 iowrite16(0x01, ioaddr + MCR1); /* Reset MAC */
806 iowrite16(2, ioaddr + MAC_SM); /* Reset internal state machine */
807 iowrite16(0, ioaddr + MAC_SM);
808 mdelay(5);
809
810 /* Restore MAC Address */
811 adrp = (u16 *) dev->dev_addr;
812 iowrite16(adrp[0], ioaddr + MID_0L);
813 iowrite16(adrp[1], ioaddr + MID_0M);
814 iowrite16(adrp[2], ioaddr + MID_0H);
815 }
816
817 static int r6040_open(struct net_device *dev)
818 {
819 struct r6040_private *lp = netdev_priv(dev);
820 int ret;
821
822 /* Request IRQ and Register interrupt handler */
823 ret = request_irq(dev->irq, &r6040_interrupt,
824 IRQF_SHARED, dev->name, dev);
825 if (ret)
826 return ret;
827
828 /* Set MAC address */
829 r6040_mac_address(dev);
830
831 /* Allocate Descriptor memory */
832 lp->rx_ring =
833 pci_alloc_consistent(lp->pdev, RX_DESC_SIZE, &lp->rx_ring_dma);
834 if (!lp->rx_ring)
835 return -ENOMEM;
836
837 lp->tx_ring =
838 pci_alloc_consistent(lp->pdev, TX_DESC_SIZE, &lp->tx_ring_dma);
839 if (!lp->tx_ring) {
840 pci_free_consistent(lp->pdev, RX_DESC_SIZE, lp->rx_ring,
841 lp->rx_ring_dma);
842 return -ENOMEM;
843 }
844
845 ret = r6040_up(dev);
846 if (ret) {
847 pci_free_consistent(lp->pdev, TX_DESC_SIZE, lp->tx_ring,
848 lp->tx_ring_dma);
849 pci_free_consistent(lp->pdev, RX_DESC_SIZE, lp->rx_ring,
850 lp->rx_ring_dma);
851 return ret;
852 }
853
854 napi_enable(&lp->napi);
855 netif_start_queue(dev);
856
857 /* set and active a timer process */
858 setup_timer(&lp->timer, r6040_timer, (unsigned long) dev);
859 if (lp->switch_sig != ICPLUS_PHY_ID)
860 mod_timer(&lp->timer, jiffies + HZ);
861 return 0;
862 }
863
864 static int r6040_start_xmit(struct sk_buff *skb, struct net_device *dev)
865 {
866 struct r6040_private *lp = netdev_priv(dev);
867 struct r6040_descriptor *descptr;
868 void __iomem *ioaddr = lp->base;
869 unsigned long flags;
870 int ret = NETDEV_TX_OK;
871
872 /* Critical Section */
873 spin_lock_irqsave(&lp->lock, flags);
874
875 /* TX resource check */
876 if (!lp->tx_free_desc) {
877 spin_unlock_irqrestore(&lp->lock, flags);
878 netif_stop_queue(dev);
879 printk(KERN_ERR DRV_NAME ": no tx descriptor\n");
880 ret = NETDEV_TX_BUSY;
881 return ret;
882 }
883
884 /* Statistic Counter */
885 dev->stats.tx_packets++;
886 dev->stats.tx_bytes += skb->len;
887 /* Set TX descriptor & Transmit it */
888 lp->tx_free_desc--;
889 descptr = lp->tx_insert_ptr;
890 if (skb->len < MISR)
891 descptr->len = MISR;
892 else
893 descptr->len = skb->len;
894
895 descptr->skb_ptr = skb;
896 descptr->buf = cpu_to_le32(pci_map_single(lp->pdev,
897 skb->data, skb->len, PCI_DMA_TODEVICE));
898 descptr->status = DSC_OWNER_MAC;
899 /* Trigger the MAC to check the TX descriptor */
900 iowrite16(0x01, ioaddr + MTPR);
901 lp->tx_insert_ptr = descptr->vndescp;
902
903 /* If no tx resource, stop */
904 if (!lp->tx_free_desc)
905 netif_stop_queue(dev);
906
907 dev->trans_start = jiffies;
908 spin_unlock_irqrestore(&lp->lock, flags);
909 return ret;
910 }
911
912 static void r6040_multicast_list(struct net_device *dev)
913 {
914 struct r6040_private *lp = netdev_priv(dev);
915 void __iomem *ioaddr = lp->base;
916 u16 *adrp;
917 u16 reg;
918 unsigned long flags;
919 struct dev_mc_list *dmi = dev->mc_list;
920 int i;
921
922 /* MAC Address */
923 adrp = (u16 *)dev->dev_addr;
924 iowrite16(adrp[0], ioaddr + MID_0L);
925 iowrite16(adrp[1], ioaddr + MID_0M);
926 iowrite16(adrp[2], ioaddr + MID_0H);
927
928 /* Promiscous Mode */
929 spin_lock_irqsave(&lp->lock, flags);
930
931 /* Clear AMCP & PROM bits */
932 reg = ioread16(ioaddr) & ~0x0120;
933 if (dev->flags & IFF_PROMISC) {
934 reg |= 0x0020;
935 lp->mcr0 |= 0x0020;
936 }
937 /* Too many multicast addresses
938 * accept all traffic */
939 else if ((dev->mc_count > MCAST_MAX)
940 || (dev->flags & IFF_ALLMULTI))
941 reg |= 0x0020;
942
943 iowrite16(reg, ioaddr);
944 spin_unlock_irqrestore(&lp->lock, flags);
945
946 /* Build the hash table */
947 if (dev->mc_count > MCAST_MAX) {
948 u16 hash_table[4];
949 u32 crc;
950
951 for (i = 0; i < 4; i++)
952 hash_table[i] = 0;
953
954 for (i = 0; i < dev->mc_count; i++) {
955 char *addrs = dmi->dmi_addr;
956
957 dmi = dmi->next;
958
959 if (!(*addrs & 1))
960 continue;
961
962 crc = ether_crc_le(6, addrs);
963 crc >>= 26;
964 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
965 }
966 /* Write the index of the hash table */
967 for (i = 0; i < 4; i++)
968 iowrite16(hash_table[i] << 14, ioaddr + MCR1);
969 /* Fill the MAC hash tables with their values */
970 iowrite16(hash_table[0], ioaddr + MAR0);
971 iowrite16(hash_table[1], ioaddr + MAR1);
972 iowrite16(hash_table[2], ioaddr + MAR2);
973 iowrite16(hash_table[3], ioaddr + MAR3);
974 }
975 /* Multicast Address 1~4 case */
976 for (i = 0, dmi; (i < dev->mc_count) && (i < MCAST_MAX); i++) {
977 adrp = (u16 *)dmi->dmi_addr;
978 iowrite16(adrp[0], ioaddr + MID_1L + 8*i);
979 iowrite16(adrp[1], ioaddr + MID_1M + 8*i);
980 iowrite16(adrp[2], ioaddr + MID_1H + 8*i);
981 dmi = dmi->next;
982 }
983 for (i = dev->mc_count; i < MCAST_MAX; i++) {
984 iowrite16(0xffff, ioaddr + MID_0L + 8*i);
985 iowrite16(0xffff, ioaddr + MID_0M + 8*i);
986 iowrite16(0xffff, ioaddr + MID_0H + 8*i);
987 }
988 }
989
990 static void netdev_get_drvinfo(struct net_device *dev,
991 struct ethtool_drvinfo *info)
992 {
993 struct r6040_private *rp = netdev_priv(dev);
994
995 strcpy(info->driver, DRV_NAME);
996 strcpy(info->version, DRV_VERSION);
997 strcpy(info->bus_info, pci_name(rp->pdev));
998 }
999
1000 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1001 {
1002 struct r6040_private *rp = netdev_priv(dev);
1003 int rc;
1004
1005 spin_lock_irq(&rp->lock);
1006 rc = mii_ethtool_gset(&rp->mii_if, cmd);
1007 spin_unlock_irq(&rp->lock);
1008
1009 return rc;
1010 }
1011
1012 static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1013 {
1014 struct r6040_private *rp = netdev_priv(dev);
1015 int rc;
1016
1017 spin_lock_irq(&rp->lock);
1018 rc = mii_ethtool_sset(&rp->mii_if, cmd);
1019 spin_unlock_irq(&rp->lock);
1020 r6040_set_carrier(&rp->mii_if);
1021
1022 return rc;
1023 }
1024
1025 static u32 netdev_get_link(struct net_device *dev)
1026 {
1027 struct r6040_private *rp = netdev_priv(dev);
1028
1029 return mii_link_ok(&rp->mii_if);
1030 }
1031
1032 static const struct ethtool_ops netdev_ethtool_ops = {
1033 .get_drvinfo = netdev_get_drvinfo,
1034 .get_settings = netdev_get_settings,
1035 .set_settings = netdev_set_settings,
1036 .get_link = netdev_get_link,
1037 };
1038
1039 static const struct net_device_ops r6040_netdev_ops = {
1040 .ndo_open = r6040_open,
1041 .ndo_stop = r6040_close,
1042 .ndo_start_xmit = r6040_start_xmit,
1043 .ndo_get_stats = r6040_get_stats,
1044 .ndo_set_multicast_list = r6040_multicast_list,
1045 .ndo_change_mtu = eth_change_mtu,
1046 .ndo_validate_addr = eth_validate_addr,
1047 .ndo_do_ioctl = r6040_ioctl,
1048 .ndo_tx_timeout = r6040_tx_timeout,
1049 #ifdef CONFIG_NET_POLL_CONTROLLER
1050 .ndo_poll_controller = r6040_poll_controller,
1051 #endif
1052 };
1053
1054 static int __devinit r6040_init_one(struct pci_dev *pdev,
1055 const struct pci_device_id *ent)
1056 {
1057 struct net_device *dev;
1058 struct r6040_private *lp;
1059 void __iomem *ioaddr;
1060 int err, io_size = R6040_IO_SIZE;
1061 static int card_idx = -1;
1062 int bar = 0;
1063 long pioaddr;
1064 u16 *adrp;
1065
1066 printk(KERN_INFO "%s\n", version);
1067
1068 err = pci_enable_device(pdev);
1069 if (err)
1070 goto err_out;
1071
1072 /* this should always be supported */
1073 err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
1074 if (err) {
1075 printk(KERN_ERR DRV_NAME "32-bit PCI DMA addresses"
1076 "not supported by the card\n");
1077 goto err_out;
1078 }
1079 err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
1080 if (err) {
1081 printk(KERN_ERR DRV_NAME "32-bit PCI DMA addresses"
1082 "not supported by the card\n");
1083 goto err_out;
1084 }
1085
1086 /* IO Size check */
1087 if (pci_resource_len(pdev, 0) < io_size) {
1088 printk(KERN_ERR DRV_NAME "Insufficient PCI resources, aborting\n");
1089 err = -EIO;
1090 goto err_out;
1091 }
1092
1093 pioaddr = pci_resource_start(pdev, 0); /* IO map base address */
1094 pci_set_master(pdev);
1095
1096 dev = alloc_etherdev(sizeof(struct r6040_private));
1097 if (!dev) {
1098 printk(KERN_ERR DRV_NAME "Failed to allocate etherdev\n");
1099 err = -ENOMEM;
1100 goto err_out;
1101 }
1102 SET_NETDEV_DEV(dev, &pdev->dev);
1103 lp = netdev_priv(dev);
1104
1105 err = pci_request_regions(pdev, DRV_NAME);
1106
1107 if (err) {
1108 printk(KERN_ERR DRV_NAME ": Failed to request PCI regions\n");
1109 goto err_out_free_dev;
1110 }
1111
1112 ioaddr = pci_iomap(pdev, bar, io_size);
1113 if (!ioaddr) {
1114 printk(KERN_ERR "ioremap failed for device %s\n",
1115 pci_name(pdev));
1116 err = -EIO;
1117 goto err_out_free_res;
1118 }
1119
1120 /* Init system & device */
1121 lp->base = ioaddr;
1122 dev->irq = pdev->irq;
1123
1124 spin_lock_init(&lp->lock);
1125 pci_set_drvdata(pdev, dev);
1126
1127 /* Set MAC address */
1128 card_idx++;
1129
1130 adrp = (u16 *)dev->dev_addr;
1131 adrp[0] = ioread16(ioaddr + MID_0L);
1132 adrp[1] = ioread16(ioaddr + MID_0M);
1133 adrp[2] = ioread16(ioaddr + MID_0H);
1134
1135 /* Link new device into r6040_root_dev */
1136 lp->pdev = pdev;
1137 lp->dev = dev;
1138
1139 /* Init RDC private data */
1140 lp->mcr0 = 0x1002;
1141 lp->phy_addr = phy_table[card_idx];
1142 lp->switch_sig = 0;
1143
1144 /* The RDC-specific entries in the device structure. */
1145 dev->netdev_ops = &r6040_netdev_ops;
1146 dev->ethtool_ops = &netdev_ethtool_ops;
1147 dev->watchdog_timeo = TX_TIMEOUT;
1148
1149 netif_napi_add(dev, &lp->napi, r6040_poll, 64);
1150 lp->mii_if.dev = dev;
1151 lp->mii_if.mdio_read = r6040_mdio_read;
1152 lp->mii_if.mdio_write = r6040_mdio_write;
1153 lp->mii_if.phy_id = lp->phy_addr;
1154 lp->mii_if.phy_id_mask = 0x1f;
1155 lp->mii_if.reg_num_mask = 0x1f;
1156
1157 /* Register net device. After this dev->name assign */
1158 err = register_netdev(dev);
1159 if (err) {
1160 printk(KERN_ERR DRV_NAME ": Failed to register net device\n");
1161 goto err_out_unmap;
1162 }
1163 return 0;
1164
1165 err_out_unmap:
1166 pci_iounmap(pdev, ioaddr);
1167 err_out_free_res:
1168 pci_release_regions(pdev);
1169 err_out_free_dev:
1170 free_netdev(dev);
1171 err_out:
1172 return err;
1173 }
1174
1175 static void __devexit r6040_remove_one(struct pci_dev *pdev)
1176 {
1177 struct net_device *dev = pci_get_drvdata(pdev);
1178
1179 unregister_netdev(dev);
1180 pci_release_regions(pdev);
1181 free_netdev(dev);
1182 pci_disable_device(pdev);
1183 pci_set_drvdata(pdev, NULL);
1184 }
1185
1186
1187 static struct pci_device_id r6040_pci_tbl[] = {
1188 { PCI_DEVICE(PCI_VENDOR_ID_RDC, 0x6040) },
1189 { 0 }
1190 };
1191 MODULE_DEVICE_TABLE(pci, r6040_pci_tbl);
1192
1193 static struct pci_driver r6040_driver = {
1194 .name = DRV_NAME,
1195 .id_table = r6040_pci_tbl,
1196 .probe = r6040_init_one,
1197 .remove = __devexit_p(r6040_remove_one),
1198 };
1199
1200
1201 static int __init r6040_init(void)
1202 {
1203 return pci_register_driver(&r6040_driver);
1204 }
1205
1206
1207 static void __exit r6040_cleanup(void)
1208 {
1209 pci_unregister_driver(&r6040_driver);
1210 }
1211
1212 module_init(r6040_init);
1213 module_exit(r6040_cleanup);
Linux kernel - Deliverables
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