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Merge branch 'drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[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 "0.19"
53 #define DRV_RELDATE "18Dec2008"
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(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 misr, status;
684
685 /* Save MIER */
686 misr = ioread16(ioaddr + MIER);
687 /* Mask off RDC MAC interrupt */
688 iowrite16(MSK_INT, ioaddr + MIER);
689 /* Read MISR status and clear */
690 status = ioread16(ioaddr + MISR);
691
692 if (status == 0x0000 || status == 0xffff)
693 return IRQ_NONE;
694
695 /* RX interrupt request */
696 if (status & RX_INTS) {
697 if (status & RX_NO_DESC) {
698 /* RX descriptor unavailable */
699 dev->stats.rx_dropped++;
700 dev->stats.rx_missed_errors++;
701 }
702 if (status & RX_FIFO_FULL)
703 dev->stats.rx_fifo_errors++;
704
705 /* Mask off RX interrupt */
706 misr &= ~RX_INTS;
707 netif_rx_schedule(&lp->napi);
708 }
709
710 /* TX interrupt request */
711 if (status & TX_INTS)
712 r6040_tx(dev);
713
714 /* Restore RDC MAC interrupt */
715 iowrite16(misr, ioaddr + MIER);
716
717 return IRQ_HANDLED;
718 }
719
720 #ifdef CONFIG_NET_POLL_CONTROLLER
721 static void r6040_poll_controller(struct net_device *dev)
722 {
723 disable_irq(dev->irq);
724 r6040_interrupt(dev->irq, dev);
725 enable_irq(dev->irq);
726 }
727 #endif
728
729 /* Init RDC MAC */
730 static int r6040_up(struct net_device *dev)
731 {
732 struct r6040_private *lp = netdev_priv(dev);
733 void __iomem *ioaddr = lp->base;
734 int ret;
735
736 /* Initialise and alloc RX/TX buffers */
737 r6040_init_txbufs(dev);
738 ret = r6040_alloc_rxbufs(dev);
739 if (ret)
740 return ret;
741
742 /* Read the PHY ID */
743 lp->switch_sig = r6040_phy_read(ioaddr, 0, 2);
744
745 if (lp->switch_sig == ICPLUS_PHY_ID) {
746 r6040_phy_write(ioaddr, 29, 31, 0x175C); /* Enable registers */
747 lp->phy_mode = 0x8000;
748 } else {
749 /* PHY Mode Check */
750 r6040_phy_write(ioaddr, lp->phy_addr, 4, PHY_CAP);
751 r6040_phy_write(ioaddr, lp->phy_addr, 0, PHY_MODE);
752
753 if (PHY_MODE == 0x3100)
754 lp->phy_mode = r6040_phy_mode_chk(dev);
755 else
756 lp->phy_mode = (PHY_MODE & 0x0100) ? 0x8000:0x0;
757 }
758
759 /* Set duplex mode */
760 lp->mcr0 |= lp->phy_mode;
761
762 /* improve performance (by RDC guys) */
763 r6040_phy_write(ioaddr, 30, 17, (r6040_phy_read(ioaddr, 30, 17) | 0x4000));
764 r6040_phy_write(ioaddr, 30, 17, ~((~r6040_phy_read(ioaddr, 30, 17)) | 0x2000));
765 r6040_phy_write(ioaddr, 0, 19, 0x0000);
766 r6040_phy_write(ioaddr, 0, 30, 0x01F0);
767
768 /* Initialize all MAC registers */
769 r6040_init_mac_regs(dev);
770
771 return 0;
772 }
773
774 /*
775 A periodic timer routine
776 Polling PHY Chip Link Status
777 */
778 static void r6040_timer(unsigned long data)
779 {
780 struct net_device *dev = (struct net_device *)data;
781 struct r6040_private *lp = netdev_priv(dev);
782 void __iomem *ioaddr = lp->base;
783 u16 phy_mode;
784
785 /* Polling PHY Chip Status */
786 if (PHY_MODE == 0x3100)
787 phy_mode = r6040_phy_mode_chk(dev);
788 else
789 phy_mode = (PHY_MODE & 0x0100) ? 0x8000:0x0;
790
791 if (phy_mode != lp->phy_mode) {
792 lp->phy_mode = phy_mode;
793 lp->mcr0 = (lp->mcr0 & 0x7fff) | phy_mode;
794 iowrite16(lp->mcr0, ioaddr);
795 printk(KERN_INFO "Link Change %x \n", ioread16(ioaddr));
796 }
797
798 /* Timer active again */
799 mod_timer(&lp->timer, round_jiffies(jiffies + HZ));
800 }
801
802 /* Read/set MAC address routines */
803 static void r6040_mac_address(struct net_device *dev)
804 {
805 struct r6040_private *lp = netdev_priv(dev);
806 void __iomem *ioaddr = lp->base;
807 u16 *adrp;
808
809 /* MAC operation register */
810 iowrite16(0x01, ioaddr + MCR1); /* Reset MAC */
811 iowrite16(2, ioaddr + MAC_SM); /* Reset internal state machine */
812 iowrite16(0, ioaddr + MAC_SM);
813 mdelay(5);
814
815 /* Restore MAC Address */
816 adrp = (u16 *) dev->dev_addr;
817 iowrite16(adrp[0], ioaddr + MID_0L);
818 iowrite16(adrp[1], ioaddr + MID_0M);
819 iowrite16(adrp[2], ioaddr + MID_0H);
820 }
821
822 static int r6040_open(struct net_device *dev)
823 {
824 struct r6040_private *lp = netdev_priv(dev);
825 int ret;
826
827 /* Request IRQ and Register interrupt handler */
828 ret = request_irq(dev->irq, &r6040_interrupt,
829 IRQF_SHARED, dev->name, dev);
830 if (ret)
831 return ret;
832
833 /* Set MAC address */
834 r6040_mac_address(dev);
835
836 /* Allocate Descriptor memory */
837 lp->rx_ring =
838 pci_alloc_consistent(lp->pdev, RX_DESC_SIZE, &lp->rx_ring_dma);
839 if (!lp->rx_ring)
840 return -ENOMEM;
841
842 lp->tx_ring =
843 pci_alloc_consistent(lp->pdev, TX_DESC_SIZE, &lp->tx_ring_dma);
844 if (!lp->tx_ring) {
845 pci_free_consistent(lp->pdev, RX_DESC_SIZE, lp->rx_ring,
846 lp->rx_ring_dma);
847 return -ENOMEM;
848 }
849
850 ret = r6040_up(dev);
851 if (ret) {
852 pci_free_consistent(lp->pdev, TX_DESC_SIZE, lp->tx_ring,
853 lp->tx_ring_dma);
854 pci_free_consistent(lp->pdev, RX_DESC_SIZE, lp->rx_ring,
855 lp->rx_ring_dma);
856 return ret;
857 }
858
859 napi_enable(&lp->napi);
860 netif_start_queue(dev);
861
862 /* set and active a timer process */
863 setup_timer(&lp->timer, r6040_timer, (unsigned long) dev);
864 if (lp->switch_sig != ICPLUS_PHY_ID)
865 mod_timer(&lp->timer, jiffies + HZ);
866 return 0;
867 }
868
869 static int r6040_start_xmit(struct sk_buff *skb, struct net_device *dev)
870 {
871 struct r6040_private *lp = netdev_priv(dev);
872 struct r6040_descriptor *descptr;
873 void __iomem *ioaddr = lp->base;
874 unsigned long flags;
875 int ret = NETDEV_TX_OK;
876
877 /* Critical Section */
878 spin_lock_irqsave(&lp->lock, flags);
879
880 /* TX resource check */
881 if (!lp->tx_free_desc) {
882 spin_unlock_irqrestore(&lp->lock, flags);
883 netif_stop_queue(dev);
884 printk(KERN_ERR DRV_NAME ": no tx descriptor\n");
885 ret = NETDEV_TX_BUSY;
886 return ret;
887 }
888
889 /* Statistic Counter */
890 dev->stats.tx_packets++;
891 dev->stats.tx_bytes += skb->len;
892 /* Set TX descriptor & Transmit it */
893 lp->tx_free_desc--;
894 descptr = lp->tx_insert_ptr;
895 if (skb->len < MISR)
896 descptr->len = MISR;
897 else
898 descptr->len = skb->len;
899
900 descptr->skb_ptr = skb;
901 descptr->buf = cpu_to_le32(pci_map_single(lp->pdev,
902 skb->data, skb->len, PCI_DMA_TODEVICE));
903 descptr->status = DSC_OWNER_MAC;
904 /* Trigger the MAC to check the TX descriptor */
905 iowrite16(0x01, ioaddr + MTPR);
906 lp->tx_insert_ptr = descptr->vndescp;
907
908 /* If no tx resource, stop */
909 if (!lp->tx_free_desc)
910 netif_stop_queue(dev);
911
912 dev->trans_start = jiffies;
913 spin_unlock_irqrestore(&lp->lock, flags);
914 return ret;
915 }
916
917 static void r6040_multicast_list(struct net_device *dev)
918 {
919 struct r6040_private *lp = netdev_priv(dev);
920 void __iomem *ioaddr = lp->base;
921 u16 *adrp;
922 u16 reg;
923 unsigned long flags;
924 struct dev_mc_list *dmi = dev->mc_list;
925 int i;
926
927 /* MAC Address */
928 adrp = (u16 *)dev->dev_addr;
929 iowrite16(adrp[0], ioaddr + MID_0L);
930 iowrite16(adrp[1], ioaddr + MID_0M);
931 iowrite16(adrp[2], ioaddr + MID_0H);
932
933 /* Promiscous Mode */
934 spin_lock_irqsave(&lp->lock, flags);
935
936 /* Clear AMCP & PROM bits */
937 reg = ioread16(ioaddr) & ~0x0120;
938 if (dev->flags & IFF_PROMISC) {
939 reg |= 0x0020;
940 lp->mcr0 |= 0x0020;
941 }
942 /* Too many multicast addresses
943 * accept all traffic */
944 else if ((dev->mc_count > MCAST_MAX)
945 || (dev->flags & IFF_ALLMULTI))
946 reg |= 0x0020;
947
948 iowrite16(reg, ioaddr);
949 spin_unlock_irqrestore(&lp->lock, flags);
950
951 /* Build the hash table */
952 if (dev->mc_count > MCAST_MAX) {
953 u16 hash_table[4];
954 u32 crc;
955
956 for (i = 0; i < 4; i++)
957 hash_table[i] = 0;
958
959 for (i = 0; i < dev->mc_count; i++) {
960 char *addrs = dmi->dmi_addr;
961
962 dmi = dmi->next;
963
964 if (!(*addrs & 1))
965 continue;
966
967 crc = ether_crc_le(6, addrs);
968 crc >>= 26;
969 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
970 }
971 /* Write the index of the hash table */
972 for (i = 0; i < 4; i++)
973 iowrite16(hash_table[i] << 14, ioaddr + MCR1);
974 /* Fill the MAC hash tables with their values */
975 iowrite16(hash_table[0], ioaddr + MAR0);
976 iowrite16(hash_table[1], ioaddr + MAR1);
977 iowrite16(hash_table[2], ioaddr + MAR2);
978 iowrite16(hash_table[3], ioaddr + MAR3);
979 }
980 /* Multicast Address 1~4 case */
981 for (i = 0, dmi; (i < dev->mc_count) && (i < MCAST_MAX); i++) {
982 adrp = (u16 *)dmi->dmi_addr;
983 iowrite16(adrp[0], ioaddr + MID_1L + 8*i);
984 iowrite16(adrp[1], ioaddr + MID_1M + 8*i);
985 iowrite16(adrp[2], ioaddr + MID_1H + 8*i);
986 dmi = dmi->next;
987 }
988 for (i = dev->mc_count; i < MCAST_MAX; i++) {
989 iowrite16(0xffff, ioaddr + MID_0L + 8*i);
990 iowrite16(0xffff, ioaddr + MID_0M + 8*i);
991 iowrite16(0xffff, ioaddr + MID_0H + 8*i);
992 }
993 }
994
995 static void netdev_get_drvinfo(struct net_device *dev,
996 struct ethtool_drvinfo *info)
997 {
998 struct r6040_private *rp = netdev_priv(dev);
999
1000 strcpy(info->driver, DRV_NAME);
1001 strcpy(info->version, DRV_VERSION);
1002 strcpy(info->bus_info, pci_name(rp->pdev));
1003 }
1004
1005 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1006 {
1007 struct r6040_private *rp = netdev_priv(dev);
1008 int rc;
1009
1010 spin_lock_irq(&rp->lock);
1011 rc = mii_ethtool_gset(&rp->mii_if, cmd);
1012 spin_unlock_irq(&rp->lock);
1013
1014 return rc;
1015 }
1016
1017 static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1018 {
1019 struct r6040_private *rp = netdev_priv(dev);
1020 int rc;
1021
1022 spin_lock_irq(&rp->lock);
1023 rc = mii_ethtool_sset(&rp->mii_if, cmd);
1024 spin_unlock_irq(&rp->lock);
1025 r6040_set_carrier(&rp->mii_if);
1026
1027 return rc;
1028 }
1029
1030 static u32 netdev_get_link(struct net_device *dev)
1031 {
1032 struct r6040_private *rp = netdev_priv(dev);
1033
1034 return mii_link_ok(&rp->mii_if);
1035 }
1036
1037 static const struct ethtool_ops netdev_ethtool_ops = {
1038 .get_drvinfo = netdev_get_drvinfo,
1039 .get_settings = netdev_get_settings,
1040 .set_settings = netdev_set_settings,
1041 .get_link = netdev_get_link,
1042 };
1043
1044 static const struct net_device_ops r6040_netdev_ops = {
1045 .ndo_open = r6040_open,
1046 .ndo_stop = r6040_close,
1047 .ndo_start_xmit = r6040_start_xmit,
1048 .ndo_get_stats = r6040_get_stats,
1049 .ndo_set_multicast_list = r6040_multicast_list,
1050 .ndo_change_mtu = eth_change_mtu,
1051 .ndo_validate_addr = eth_validate_addr,
1052 .ndo_do_ioctl = r6040_ioctl,
1053 .ndo_tx_timeout = r6040_tx_timeout,
1054 #ifdef CONFIG_NET_POLL_CONTROLLER
1055 .ndo_poll_controller = r6040_poll_controller,
1056 #endif
1057 };
1058
1059 static int __devinit r6040_init_one(struct pci_dev *pdev,
1060 const struct pci_device_id *ent)
1061 {
1062 struct net_device *dev;
1063 struct r6040_private *lp;
1064 void __iomem *ioaddr;
1065 int err, io_size = R6040_IO_SIZE;
1066 static int card_idx = -1;
1067 int bar = 0;
1068 long pioaddr;
1069 u16 *adrp;
1070
1071 printk(KERN_INFO "%s\n", version);
1072
1073 err = pci_enable_device(pdev);
1074 if (err)
1075 goto err_out;
1076
1077 /* this should always be supported */
1078 err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
1079 if (err) {
1080 printk(KERN_ERR DRV_NAME "32-bit PCI DMA addresses"
1081 "not supported by the card\n");
1082 goto err_out;
1083 }
1084 err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
1085 if (err) {
1086 printk(KERN_ERR DRV_NAME "32-bit PCI DMA addresses"
1087 "not supported by the card\n");
1088 goto err_out;
1089 }
1090
1091 /* IO Size check */
1092 if (pci_resource_len(pdev, 0) < io_size) {
1093 printk(KERN_ERR DRV_NAME "Insufficient PCI resources, aborting\n");
1094 err = -EIO;
1095 goto err_out;
1096 }
1097
1098 pioaddr = pci_resource_start(pdev, 0); /* IO map base address */
1099 pci_set_master(pdev);
1100
1101 dev = alloc_etherdev(sizeof(struct r6040_private));
1102 if (!dev) {
1103 printk(KERN_ERR DRV_NAME "Failed to allocate etherdev\n");
1104 err = -ENOMEM;
1105 goto err_out;
1106 }
1107 SET_NETDEV_DEV(dev, &pdev->dev);
1108 lp = netdev_priv(dev);
1109
1110 err = pci_request_regions(pdev, DRV_NAME);
1111
1112 if (err) {
1113 printk(KERN_ERR DRV_NAME ": Failed to request PCI regions\n");
1114 goto err_out_free_dev;
1115 }
1116
1117 ioaddr = pci_iomap(pdev, bar, io_size);
1118 if (!ioaddr) {
1119 printk(KERN_ERR "ioremap failed for device %s\n",
1120 pci_name(pdev));
1121 err = -EIO;
1122 goto err_out_free_res;
1123 }
1124
1125 /* Init system & device */
1126 lp->base = ioaddr;
1127 dev->irq = pdev->irq;
1128
1129 spin_lock_init(&lp->lock);
1130 pci_set_drvdata(pdev, dev);
1131
1132 /* Set MAC address */
1133 card_idx++;
1134
1135 adrp = (u16 *)dev->dev_addr;
1136 adrp[0] = ioread16(ioaddr + MID_0L);
1137 adrp[1] = ioread16(ioaddr + MID_0M);
1138 adrp[2] = ioread16(ioaddr + MID_0H);
1139
1140 /* Link new device into r6040_root_dev */
1141 lp->pdev = pdev;
1142 lp->dev = dev;
1143
1144 /* Init RDC private data */
1145 lp->mcr0 = 0x1002;
1146 lp->phy_addr = phy_table[card_idx];
1147 lp->switch_sig = 0;
1148
1149 /* The RDC-specific entries in the device structure. */
1150 dev->netdev_ops = &r6040_netdev_ops;
1151 dev->ethtool_ops = &netdev_ethtool_ops;
1152 dev->watchdog_timeo = TX_TIMEOUT;
1153
1154 netif_napi_add(dev, &lp->napi, r6040_poll, 64);
1155 lp->mii_if.dev = dev;
1156 lp->mii_if.mdio_read = r6040_mdio_read;
1157 lp->mii_if.mdio_write = r6040_mdio_write;
1158 lp->mii_if.phy_id = lp->phy_addr;
1159 lp->mii_if.phy_id_mask = 0x1f;
1160 lp->mii_if.reg_num_mask = 0x1f;
1161
1162 /* Register net device. After this dev->name assign */
1163 err = register_netdev(dev);
1164 if (err) {
1165 printk(KERN_ERR DRV_NAME ": Failed to register net device\n");
1166 goto err_out_unmap;
1167 }
1168 return 0;
1169
1170 err_out_unmap:
1171 pci_iounmap(pdev, ioaddr);
1172 err_out_free_res:
1173 pci_release_regions(pdev);
1174 err_out_free_dev:
1175 free_netdev(dev);
1176 err_out:
1177 return err;
1178 }
1179
1180 static void __devexit r6040_remove_one(struct pci_dev *pdev)
1181 {
1182 struct net_device *dev = pci_get_drvdata(pdev);
1183
1184 unregister_netdev(dev);
1185 pci_release_regions(pdev);
1186 free_netdev(dev);
1187 pci_disable_device(pdev);
1188 pci_set_drvdata(pdev, NULL);
1189 }
1190
1191
1192 static struct pci_device_id r6040_pci_tbl[] = {
1193 { PCI_DEVICE(PCI_VENDOR_ID_RDC, 0x6040) },
1194 { 0 }
1195 };
1196 MODULE_DEVICE_TABLE(pci, r6040_pci_tbl);
1197
1198 static struct pci_driver r6040_driver = {
1199 .name = DRV_NAME,
1200 .id_table = r6040_pci_tbl,
1201 .probe = r6040_init_one,
1202 .remove = __devexit_p(r6040_remove_one),
1203 };
1204
1205
1206 static int __init r6040_init(void)
1207 {
1208 return pci_register_driver(&r6040_driver);
1209 }
1210
1211
1212 static void __exit r6040_cleanup(void)
1213 {
1214 pci_unregister_driver(&r6040_driver);
1215 }
1216
1217 module_init(r6040_init);
1218 module_exit(r6040_cleanup);
Linux kernel - Deliverables
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