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Linux 4.16.11
[linux/fpc-iii.git] / drivers / net / ethernet / smsc / epic100.c
blob949aaef390b67bbf9a21c15a24f912898b422229
1 /* epic100.c: A SMC 83c170 EPIC/100 Fast Ethernet driver for Linux. */
2 /*
3 Written/copyright 1997-2001 by Donald Becker.
4
5 This software may be used and distributed according to the terms of
6 the GNU General Public License (GPL), incorporated herein by reference.
7 Drivers based on or derived from this code fall under the GPL and must
8 retain the authorship, copyright and license notice. This file is not
9 a complete program and may only be used when the entire operating
10 system is licensed under the GPL.
11
12 This driver is for the SMC83c170/175 "EPIC" series, as used on the
13 SMC EtherPower II 9432 PCI adapter, and several CardBus cards.
14
15 The author may be reached as becker@scyld.com, or C/O
16 Scyld Computing Corporation
17 410 Severn Ave., Suite 210
18 Annapolis MD 21403
19
20 Information and updates available at
21 http://www.scyld.com/network/epic100.html
22 [this link no longer provides anything useful -jgarzik]
23
24 ---------------------------------------------------------------------
25
26 */
27
28 #define DRV_NAME "epic100"
29 #define DRV_VERSION "2.1"
30 #define DRV_RELDATE "Sept 11, 2006"
31
32 /* The user-configurable values.
33 These may be modified when a driver module is loaded.*/
34
35 static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */
36
37 /* Used to pass the full-duplex flag, etc. */
38 #define MAX_UNITS 8 /* More are supported, limit only on options */
39 static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
40 static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
41
42 /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
43 Setting to > 1518 effectively disables this feature. */
44 static int rx_copybreak;
45
46 /* Operational parameters that are set at compile time. */
47
48 /* Keep the ring sizes a power of two for operational efficiency.
49 The compiler will convert <unsigned>'%'<2^N> into a bit mask.
50 Making the Tx ring too large decreases the effectiveness of channel
51 bonding and packet priority.
52 There are no ill effects from too-large receive rings. */
53 #define TX_RING_SIZE 256
54 #define TX_QUEUE_LEN 240 /* Limit ring entries actually used. */
55 #define RX_RING_SIZE 256
56 #define TX_TOTAL_SIZE TX_RING_SIZE*sizeof(struct epic_tx_desc)
57 #define RX_TOTAL_SIZE RX_RING_SIZE*sizeof(struct epic_rx_desc)
58
59 /* Operational parameters that usually are not changed. */
60 /* Time in jiffies before concluding the transmitter is hung. */
61 #define TX_TIMEOUT (2*HZ)
62
63 #define PKT_BUF_SZ 1536 /* Size of each temporary Rx buffer.*/
64
65 /* Bytes transferred to chip before transmission starts. */
66 /* Initial threshold, increased on underflow, rounded down to 4 byte units. */
67 #define TX_FIFO_THRESH 256
68 #define RX_FIFO_THRESH 1 /* 0-3, 0==32, 64,96, or 3==128 bytes */
69
70 #include <linux/module.h>
71 #include <linux/kernel.h>
72 #include <linux/string.h>
73 #include <linux/timer.h>
74 #include <linux/errno.h>
75 #include <linux/ioport.h>
76 #include <linux/interrupt.h>
77 #include <linux/pci.h>
78 #include <linux/delay.h>
79 #include <linux/netdevice.h>
80 #include <linux/etherdevice.h>
81 #include <linux/skbuff.h>
82 #include <linux/init.h>
83 #include <linux/spinlock.h>
84 #include <linux/ethtool.h>
85 #include <linux/mii.h>
86 #include <linux/crc32.h>
87 #include <linux/bitops.h>
88 #include <asm/io.h>
89 #include <linux/uaccess.h>
90 #include <asm/byteorder.h>
91
92 /* These identify the driver base version and may not be removed. */
93 static char version[] =
94 DRV_NAME ".c:v1.11 1/7/2001 Written by Donald Becker <becker@scyld.com>";
95 static char version2[] =
96 " (unofficial 2.4.x kernel port, version " DRV_VERSION ", " DRV_RELDATE ")";
97
98 MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
99 MODULE_DESCRIPTION("SMC 83c170 EPIC series Ethernet driver");
100 MODULE_LICENSE("GPL");
101
102 module_param(debug, int, 0);
103 module_param(rx_copybreak, int, 0);
104 module_param_array(options, int, NULL, 0);
105 module_param_array(full_duplex, int, NULL, 0);
106 MODULE_PARM_DESC(debug, "EPIC/100 debug level (0-5)");
107 MODULE_PARM_DESC(options, "EPIC/100: Bits 0-3: media type, bit 4: full duplex");
108 MODULE_PARM_DESC(rx_copybreak, "EPIC/100 copy breakpoint for copy-only-tiny-frames");
109 MODULE_PARM_DESC(full_duplex, "EPIC/100 full duplex setting(s) (1)");
110
111 /*
112 Theory of Operation
113
114 I. Board Compatibility
115
116 This device driver is designed for the SMC "EPIC/100", the SMC
117 single-chip Ethernet controllers for PCI. This chip is used on
118 the SMC EtherPower II boards.
119
120 II. Board-specific settings
121
122 PCI bus devices are configured by the system at boot time, so no jumpers
123 need to be set on the board. The system BIOS will assign the
124 PCI INTA signal to a (preferably otherwise unused) system IRQ line.
125 Note: Kernel versions earlier than 1.3.73 do not support shared PCI
126 interrupt lines.
127
128 III. Driver operation
129
130 IIIa. Ring buffers
131
132 IVb. References
133
134 http://www.smsc.com/media/Downloads_Public/discontinued/83c171.pdf
135 http://www.smsc.com/media/Downloads_Public/discontinued/83c175.pdf
136 http://scyld.com/expert/NWay.html
137 http://www.national.com/pf/DP/DP83840A.html
138
139 IVc. Errata
140
141 */
142
143
144 enum chip_capability_flags { MII_PWRDWN=1, TYPE2_INTR=2, NO_MII=4 };
145
146 #define EPIC_TOTAL_SIZE 0x100
147 #define USE_IO_OPS 1
148
149 #ifdef USE_IO_OPS
150 #define EPIC_BAR 0
151 #else
152 #define EPIC_BAR 1
153 #endif
154
155 typedef enum {
156 SMSC_83C170_0,
157 SMSC_83C170,
158 SMSC_83C175,
159 } chip_t;
160
161
162 struct epic_chip_info {
163 const char *name;
164 int drv_flags; /* Driver use, intended as capability flags. */
165 };
166
167
168 /* indexed by chip_t */
169 static const struct epic_chip_info pci_id_tbl[] = {
170 { "SMSC EPIC/100 83c170", TYPE2_INTR | NO_MII | MII_PWRDWN },
171 { "SMSC EPIC/100 83c170", TYPE2_INTR },
172 { "SMSC EPIC/C 83c175", TYPE2_INTR | MII_PWRDWN },
173 };
174
175
176 static const struct pci_device_id epic_pci_tbl[] = {
177 { 0x10B8, 0x0005, 0x1092, 0x0AB4, 0, 0, SMSC_83C170_0 },
178 { 0x10B8, 0x0005, PCI_ANY_ID, PCI_ANY_ID, 0, 0, SMSC_83C170 },
179 { 0x10B8, 0x0006, PCI_ANY_ID, PCI_ANY_ID,
180 PCI_CLASS_NETWORK_ETHERNET << 8, 0xffff00, SMSC_83C175 },
181 { 0,}
182 };
183 MODULE_DEVICE_TABLE (pci, epic_pci_tbl);
184
185 #define ew16(reg, val) iowrite16(val, ioaddr + (reg))
186 #define ew32(reg, val) iowrite32(val, ioaddr + (reg))
187 #define er8(reg) ioread8(ioaddr + (reg))
188 #define er16(reg) ioread16(ioaddr + (reg))
189 #define er32(reg) ioread32(ioaddr + (reg))
190
191 /* Offsets to registers, using the (ugh) SMC names. */
192 enum epic_registers {
193 COMMAND=0, INTSTAT=4, INTMASK=8, GENCTL=0x0C, NVCTL=0x10, EECTL=0x14,
194 PCIBurstCnt=0x18,
195 TEST1=0x1C, CRCCNT=0x20, ALICNT=0x24, MPCNT=0x28, /* Rx error counters. */
196 MIICtrl=0x30, MIIData=0x34, MIICfg=0x38,
197 LAN0=64, /* MAC address. */
198 MC0=80, /* Multicast filter table. */
199 RxCtrl=96, TxCtrl=112, TxSTAT=0x74,
200 PRxCDAR=0x84, RxSTAT=0xA4, EarlyRx=0xB0, PTxCDAR=0xC4, TxThresh=0xDC,
201 };
202
203 /* Interrupt register bits, using my own meaningful names. */
204 enum IntrStatus {
205 TxIdle=0x40000, RxIdle=0x20000, IntrSummary=0x010000,
206 PCIBusErr170=0x7000, PCIBusErr175=0x1000, PhyEvent175=0x8000,
207 RxStarted=0x0800, RxEarlyWarn=0x0400, CntFull=0x0200, TxUnderrun=0x0100,
208 TxEmpty=0x0080, TxDone=0x0020, RxError=0x0010,
209 RxOverflow=0x0008, RxFull=0x0004, RxHeader=0x0002, RxDone=0x0001,
210 };
211 enum CommandBits {
212 StopRx=1, StartRx=2, TxQueued=4, RxQueued=8,
213 StopTxDMA=0x20, StopRxDMA=0x40, RestartTx=0x80,
214 };
215
216 #define EpicRemoved 0xffffffff /* Chip failed or removed (CardBus) */
217
218 #define EpicNapiEvent (TxEmpty | TxDone | \
219 RxDone | RxStarted | RxEarlyWarn | RxOverflow | RxFull)
220 #define EpicNormalEvent (0x0000ffff & ~EpicNapiEvent)
221
222 static const u16 media2miictl[16] = {
223 0, 0x0C00, 0x0C00, 0x2000, 0x0100, 0x2100, 0, 0,
224 0, 0, 0, 0, 0, 0, 0, 0 };
225
226 /*
227 * The EPIC100 Rx and Tx buffer descriptors. Note that these
228 * really ARE host-endian; it's not a misannotation. We tell
229 * the card to byteswap them internally on big-endian hosts -
230 * look for #ifdef __BIG_ENDIAN in epic_open().
231 */
232
233 struct epic_tx_desc {
234 u32 txstatus;
235 u32 bufaddr;
236 u32 buflength;
237 u32 next;
238 };
239
240 struct epic_rx_desc {
241 u32 rxstatus;
242 u32 bufaddr;
243 u32 buflength;
244 u32 next;
245 };
246
247 enum desc_status_bits {
248 DescOwn=0x8000,
249 };
250
251 #define PRIV_ALIGN 15 /* Required alignment mask */
252 struct epic_private {
253 struct epic_rx_desc *rx_ring;
254 struct epic_tx_desc *tx_ring;
255 /* The saved address of a sent-in-place packet/buffer, for skfree(). */
256 struct sk_buff* tx_skbuff[TX_RING_SIZE];
257 /* The addresses of receive-in-place skbuffs. */
258 struct sk_buff* rx_skbuff[RX_RING_SIZE];
259
260 dma_addr_t tx_ring_dma;
261 dma_addr_t rx_ring_dma;
262
263 /* Ring pointers. */
264 spinlock_t lock; /* Group with Tx control cache line. */
265 spinlock_t napi_lock;
266 struct napi_struct napi;
267 unsigned int cur_tx, dirty_tx;
268
269 unsigned int cur_rx, dirty_rx;
270 u32 irq_mask;
271 unsigned int rx_buf_sz; /* Based on MTU+slack. */
272
273 void __iomem *ioaddr;
274 struct pci_dev *pci_dev; /* PCI bus location. */
275 int chip_id, chip_flags;
276
277 struct timer_list timer; /* Media selection timer. */
278 int tx_threshold;
279 unsigned char mc_filter[8];
280 signed char phys[4]; /* MII device addresses. */
281 u16 advertising; /* NWay media advertisement */
282 int mii_phy_cnt;
283 struct mii_if_info mii;
284 unsigned int tx_full:1; /* The Tx queue is full. */
285 unsigned int default_port:4; /* Last dev->if_port value. */
286 };
287
288 static int epic_open(struct net_device *dev);
289 static int read_eeprom(struct epic_private *, int);
290 static int mdio_read(struct net_device *dev, int phy_id, int location);
291 static void mdio_write(struct net_device *dev, int phy_id, int loc, int val);
292 static void epic_restart(struct net_device *dev);
293 static void epic_timer(struct timer_list *t);
294 static void epic_tx_timeout(struct net_device *dev);
295 static void epic_init_ring(struct net_device *dev);
296 static netdev_tx_t epic_start_xmit(struct sk_buff *skb,
297 struct net_device *dev);
298 static int epic_rx(struct net_device *dev, int budget);
299 static int epic_poll(struct napi_struct *napi, int budget);
300 static irqreturn_t epic_interrupt(int irq, void *dev_instance);
301 static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
302 static const struct ethtool_ops netdev_ethtool_ops;
303 static int epic_close(struct net_device *dev);
304 static struct net_device_stats *epic_get_stats(struct net_device *dev);
305 static void set_rx_mode(struct net_device *dev);
306
307 static const struct net_device_ops epic_netdev_ops = {
308 .ndo_open = epic_open,
309 .ndo_stop = epic_close,
310 .ndo_start_xmit = epic_start_xmit,
311 .ndo_tx_timeout = epic_tx_timeout,
312 .ndo_get_stats = epic_get_stats,
313 .ndo_set_rx_mode = set_rx_mode,
314 .ndo_do_ioctl = netdev_ioctl,
315 .ndo_set_mac_address = eth_mac_addr,
316 .ndo_validate_addr = eth_validate_addr,
317 };
318
319 static int epic_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
320 {
321 static int card_idx = -1;
322 void __iomem *ioaddr;
323 int chip_idx = (int) ent->driver_data;
324 int irq;
325 struct net_device *dev;
326 struct epic_private *ep;
327 int i, ret, option = 0, duplex = 0;
328 void *ring_space;
329 dma_addr_t ring_dma;
330
331 /* when built into the kernel, we only print version if device is found */
332 #ifndef MODULE
333 pr_info_once("%s%s\n", version, version2);
334 #endif
335
336 card_idx++;
337
338 ret = pci_enable_device(pdev);
339 if (ret)
340 goto out;
341 irq = pdev->irq;
342
343 if (pci_resource_len(pdev, 0) < EPIC_TOTAL_SIZE) {
344 dev_err(&pdev->dev, "no PCI region space\n");
345 ret = -ENODEV;
346 goto err_out_disable;
347 }
348
349 pci_set_master(pdev);
350
351 ret = pci_request_regions(pdev, DRV_NAME);
352 if (ret < 0)
353 goto err_out_disable;
354
355 ret = -ENOMEM;
356
357 dev = alloc_etherdev(sizeof (*ep));
358 if (!dev)
359 goto err_out_free_res;
360
361 SET_NETDEV_DEV(dev, &pdev->dev);
362
363 ioaddr = pci_iomap(pdev, EPIC_BAR, 0);
364 if (!ioaddr) {
365 dev_err(&pdev->dev, "ioremap failed\n");
366 goto err_out_free_netdev;
367 }
368
369 pci_set_drvdata(pdev, dev);
370 ep = netdev_priv(dev);
371 ep->ioaddr = ioaddr;
372 ep->mii.dev = dev;
373 ep->mii.mdio_read = mdio_read;
374 ep->mii.mdio_write = mdio_write;
375 ep->mii.phy_id_mask = 0x1f;
376 ep->mii.reg_num_mask = 0x1f;
377
378 ring_space = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &ring_dma);
379 if (!ring_space)
380 goto err_out_iounmap;
381 ep->tx_ring = ring_space;
382 ep->tx_ring_dma = ring_dma;
383
384 ring_space = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &ring_dma);
385 if (!ring_space)
386 goto err_out_unmap_tx;
387 ep->rx_ring = ring_space;
388 ep->rx_ring_dma = ring_dma;
389
390 if (dev->mem_start) {
391 option = dev->mem_start;
392 duplex = (dev->mem_start & 16) ? 1 : 0;
393 } else if (card_idx >= 0 && card_idx < MAX_UNITS) {
394 if (options[card_idx] >= 0)
395 option = options[card_idx];
396 if (full_duplex[card_idx] >= 0)
397 duplex = full_duplex[card_idx];
398 }
399
400 spin_lock_init(&ep->lock);
401 spin_lock_init(&ep->napi_lock);
402
403 /* Bring the chip out of low-power mode. */
404 ew32(GENCTL, 0x4200);
405 /* Magic?! If we don't set this bit the MII interface won't work. */
406 /* This magic is documented in SMSC app note 7.15 */
407 for (i = 16; i > 0; i--)
408 ew32(TEST1, 0x0008);
409
410 /* Turn on the MII transceiver. */
411 ew32(MIICfg, 0x12);
412 if (chip_idx == 1)
413 ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
414 ew32(GENCTL, 0x0200);
415
416 /* Note: the '175 does not have a serial EEPROM. */
417 for (i = 0; i < 3; i++)
418 ((__le16 *)dev->dev_addr)[i] = cpu_to_le16(er16(LAN0 + i*4));
419
420 if (debug > 2) {
421 dev_dbg(&pdev->dev, "EEPROM contents:\n");
422 for (i = 0; i < 64; i++)
423 pr_cont(" %4.4x%s", read_eeprom(ep, i),
424 i % 16 == 15 ? "\n" : "");
425 }
426
427 ep->pci_dev = pdev;
428 ep->chip_id = chip_idx;
429 ep->chip_flags = pci_id_tbl[chip_idx].drv_flags;
430 ep->irq_mask =
431 (ep->chip_flags & TYPE2_INTR ? PCIBusErr175 : PCIBusErr170)
432 | CntFull | TxUnderrun | EpicNapiEvent;
433
434 /* Find the connected MII xcvrs.
435 Doing this in open() would allow detecting external xcvrs later, but
436 takes much time and no cards have external MII. */
437 {
438 int phy, phy_idx = 0;
439 for (phy = 1; phy < 32 && phy_idx < sizeof(ep->phys); phy++) {
440 int mii_status = mdio_read(dev, phy, MII_BMSR);
441 if (mii_status != 0xffff && mii_status != 0x0000) {
442 ep->phys[phy_idx++] = phy;
443 dev_info(&pdev->dev,
444 "MII transceiver #%d control "
445 "%4.4x status %4.4x.\n",
446 phy, mdio_read(dev, phy, 0), mii_status);
447 }
448 }
449 ep->mii_phy_cnt = phy_idx;
450 if (phy_idx != 0) {
451 phy = ep->phys[0];
452 ep->mii.advertising = mdio_read(dev, phy, MII_ADVERTISE);
453 dev_info(&pdev->dev,
454 "Autonegotiation advertising %4.4x link "
455 "partner %4.4x.\n",
456 ep->mii.advertising, mdio_read(dev, phy, 5));
457 } else if ( ! (ep->chip_flags & NO_MII)) {
458 dev_warn(&pdev->dev,
459 "***WARNING***: No MII transceiver found!\n");
460 /* Use the known PHY address of the EPII. */
461 ep->phys[0] = 3;
462 }
463 ep->mii.phy_id = ep->phys[0];
464 }
465
466 /* Turn off the MII xcvr (175 only!), leave the chip in low-power mode. */
467 if (ep->chip_flags & MII_PWRDWN)
468 ew32(NVCTL, er32(NVCTL) & ~0x483c);
469 ew32(GENCTL, 0x0008);
470
471 /* The lower four bits are the media type. */
472 if (duplex) {
473 ep->mii.force_media = ep->mii.full_duplex = 1;
474 dev_info(&pdev->dev, "Forced full duplex requested.\n");
475 }
476 dev->if_port = ep->default_port = option;
477
478 /* The Epic-specific entries in the device structure. */
479 dev->netdev_ops = &epic_netdev_ops;
480 dev->ethtool_ops = &netdev_ethtool_ops;
481 dev->watchdog_timeo = TX_TIMEOUT;
482 netif_napi_add(dev, &ep->napi, epic_poll, 64);
483
484 ret = register_netdev(dev);
485 if (ret < 0)
486 goto err_out_unmap_rx;
487
488 netdev_info(dev, "%s at %lx, IRQ %d, %pM\n",
489 pci_id_tbl[chip_idx].name,
490 (long)pci_resource_start(pdev, EPIC_BAR), pdev->irq,
491 dev->dev_addr);
492
493 out:
494 return ret;
495
496 err_out_unmap_rx:
497 pci_free_consistent(pdev, RX_TOTAL_SIZE, ep->rx_ring, ep->rx_ring_dma);
498 err_out_unmap_tx:
499 pci_free_consistent(pdev, TX_TOTAL_SIZE, ep->tx_ring, ep->tx_ring_dma);
500 err_out_iounmap:
501 pci_iounmap(pdev, ioaddr);
502 err_out_free_netdev:
503 free_netdev(dev);
504 err_out_free_res:
505 pci_release_regions(pdev);
506 err_out_disable:
507 pci_disable_device(pdev);
508 goto out;
509 }
510
511 /* Serial EEPROM section. */
512
513 /* EEPROM_Ctrl bits. */
514 #define EE_SHIFT_CLK 0x04 /* EEPROM shift clock. */
515 #define EE_CS 0x02 /* EEPROM chip select. */
516 #define EE_DATA_WRITE 0x08 /* EEPROM chip data in. */
517 #define EE_WRITE_0 0x01
518 #define EE_WRITE_1 0x09
519 #define EE_DATA_READ 0x10 /* EEPROM chip data out. */
520 #define EE_ENB (0x0001 | EE_CS)
521
522 /* Delay between EEPROM clock transitions.
523 This serves to flush the operation to the PCI bus.
524 */
525
526 #define eeprom_delay() er32(EECTL)
527
528 /* The EEPROM commands include the alway-set leading bit. */
529 #define EE_WRITE_CMD (5 << 6)
530 #define EE_READ64_CMD (6 << 6)
531 #define EE_READ256_CMD (6 << 8)
532 #define EE_ERASE_CMD (7 << 6)
533
534 static void epic_disable_int(struct net_device *dev, struct epic_private *ep)
535 {
536 void __iomem *ioaddr = ep->ioaddr;
537
538 ew32(INTMASK, 0x00000000);
539 }
540
541 static inline void __epic_pci_commit(void __iomem *ioaddr)
542 {
543 #ifndef USE_IO_OPS
544 er32(INTMASK);
545 #endif
546 }
547
548 static inline void epic_napi_irq_off(struct net_device *dev,
549 struct epic_private *ep)
550 {
551 void __iomem *ioaddr = ep->ioaddr;
552
553 ew32(INTMASK, ep->irq_mask & ~EpicNapiEvent);
554 __epic_pci_commit(ioaddr);
555 }
556
557 static inline void epic_napi_irq_on(struct net_device *dev,
558 struct epic_private *ep)
559 {
560 void __iomem *ioaddr = ep->ioaddr;
561
562 /* No need to commit possible posted write */
563 ew32(INTMASK, ep->irq_mask | EpicNapiEvent);
564 }
565
566 static int read_eeprom(struct epic_private *ep, int location)
567 {
568 void __iomem *ioaddr = ep->ioaddr;
569 int i;
570 int retval = 0;
571 int read_cmd = location |
572 (er32(EECTL) & 0x40 ? EE_READ64_CMD : EE_READ256_CMD);
573
574 ew32(EECTL, EE_ENB & ~EE_CS);
575 ew32(EECTL, EE_ENB);
576
577 /* Shift the read command bits out. */
578 for (i = 12; i >= 0; i--) {
579 short dataval = (read_cmd & (1 << i)) ? EE_WRITE_1 : EE_WRITE_0;
580 ew32(EECTL, EE_ENB | dataval);
581 eeprom_delay();
582 ew32(EECTL, EE_ENB | dataval | EE_SHIFT_CLK);
583 eeprom_delay();
584 }
585 ew32(EECTL, EE_ENB);
586
587 for (i = 16; i > 0; i--) {
588 ew32(EECTL, EE_ENB | EE_SHIFT_CLK);
589 eeprom_delay();
590 retval = (retval << 1) | ((er32(EECTL) & EE_DATA_READ) ? 1 : 0);
591 ew32(EECTL, EE_ENB);
592 eeprom_delay();
593 }
594
595 /* Terminate the EEPROM access. */
596 ew32(EECTL, EE_ENB & ~EE_CS);
597 return retval;
598 }
599
600 #define MII_READOP 1
601 #define MII_WRITEOP 2
602 static int mdio_read(struct net_device *dev, int phy_id, int location)
603 {
604 struct epic_private *ep = netdev_priv(dev);
605 void __iomem *ioaddr = ep->ioaddr;
606 int read_cmd = (phy_id << 9) | (location << 4) | MII_READOP;
607 int i;
608
609 ew32(MIICtrl, read_cmd);
610 /* Typical operation takes 25 loops. */
611 for (i = 400; i > 0; i--) {
612 barrier();
613 if ((er32(MIICtrl) & MII_READOP) == 0) {
614 /* Work around read failure bug. */
615 if (phy_id == 1 && location < 6 &&
616 er16(MIIData) == 0xffff) {
617 ew32(MIICtrl, read_cmd);
618 continue;
619 }
620 return er16(MIIData);
621 }
622 }
623 return 0xffff;
624 }
625
626 static void mdio_write(struct net_device *dev, int phy_id, int loc, int value)
627 {
628 struct epic_private *ep = netdev_priv(dev);
629 void __iomem *ioaddr = ep->ioaddr;
630 int i;
631
632 ew16(MIIData, value);
633 ew32(MIICtrl, (phy_id << 9) | (loc << 4) | MII_WRITEOP);
634 for (i = 10000; i > 0; i--) {
635 barrier();
636 if ((er32(MIICtrl) & MII_WRITEOP) == 0)
637 break;
638 }
639 }
640
641
642 static int epic_open(struct net_device *dev)
643 {
644 struct epic_private *ep = netdev_priv(dev);
645 void __iomem *ioaddr = ep->ioaddr;
646 const int irq = ep->pci_dev->irq;
647 int rc, i;
648
649 /* Soft reset the chip. */
650 ew32(GENCTL, 0x4001);
651
652 napi_enable(&ep->napi);
653 rc = request_irq(irq, epic_interrupt, IRQF_SHARED, dev->name, dev);
654 if (rc) {
655 napi_disable(&ep->napi);
656 return rc;
657 }
658
659 epic_init_ring(dev);
660
661 ew32(GENCTL, 0x4000);
662 /* This magic is documented in SMSC app note 7.15 */
663 for (i = 16; i > 0; i--)
664 ew32(TEST1, 0x0008);
665
666 /* Pull the chip out of low-power mode, enable interrupts, and set for
667 PCI read multiple. The MIIcfg setting and strange write order are
668 required by the details of which bits are reset and the transceiver
669 wiring on the Ositech CardBus card.
670 */
671 #if 0
672 ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
673 #endif
674 if (ep->chip_flags & MII_PWRDWN)
675 ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
676
677 /* Tell the chip to byteswap descriptors on big-endian hosts */
678 #ifdef __BIG_ENDIAN
679 ew32(GENCTL, 0x4432 | (RX_FIFO_THRESH << 8));
680 er32(GENCTL);
681 ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
682 #else
683 ew32(GENCTL, 0x4412 | (RX_FIFO_THRESH << 8));
684 er32(GENCTL);
685 ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
686 #endif
687
688 udelay(20); /* Looks like EPII needs that if you want reliable RX init. FIXME: pci posting bug? */
689
690 for (i = 0; i < 3; i++)
691 ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));
692
693 ep->tx_threshold = TX_FIFO_THRESH;
694 ew32(TxThresh, ep->tx_threshold);
695
696 if (media2miictl[dev->if_port & 15]) {
697 if (ep->mii_phy_cnt)
698 mdio_write(dev, ep->phys[0], MII_BMCR, media2miictl[dev->if_port&15]);
699 if (dev->if_port == 1) {
700 if (debug > 1)
701 netdev_info(dev, "Using the 10base2 transceiver, MII status %4.4x.\n",
702 mdio_read(dev, ep->phys[0], MII_BMSR));
703 }
704 } else {
705 int mii_lpa = mdio_read(dev, ep->phys[0], MII_LPA);
706 if (mii_lpa != 0xffff) {
707 if ((mii_lpa & LPA_100FULL) || (mii_lpa & 0x01C0) == LPA_10FULL)
708 ep->mii.full_duplex = 1;
709 else if (! (mii_lpa & LPA_LPACK))
710 mdio_write(dev, ep->phys[0], MII_BMCR, BMCR_ANENABLE|BMCR_ANRESTART);
711 if (debug > 1)
712 netdev_info(dev, "Setting %s-duplex based on MII xcvr %d register read of %4.4x.\n",
713 ep->mii.full_duplex ? "full"
714 : "half",
715 ep->phys[0], mii_lpa);
716 }
717 }
718
719 ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
720 ew32(PRxCDAR, ep->rx_ring_dma);
721 ew32(PTxCDAR, ep->tx_ring_dma);
722
723 /* Start the chip's Rx process. */
724 set_rx_mode(dev);
725 ew32(COMMAND, StartRx | RxQueued);
726
727 netif_start_queue(dev);
728
729 /* Enable interrupts by setting the interrupt mask. */
730 ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
731 ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
732 TxUnderrun);
733
734 if (debug > 1) {
735 netdev_dbg(dev, "epic_open() ioaddr %p IRQ %d status %4.4x %s-duplex.\n",
736 ioaddr, irq, er32(GENCTL),
737 ep->mii.full_duplex ? "full" : "half");
738 }
739
740 /* Set the timer to switch to check for link beat and perhaps switch
741 to an alternate media type. */
742 timer_setup(&ep->timer, epic_timer, 0);
743 ep->timer.expires = jiffies + 3*HZ;
744 add_timer(&ep->timer);
745
746 return rc;
747 }
748
749 /* Reset the chip to recover from a PCI transaction error.
750 This may occur at interrupt time. */
751 static void epic_pause(struct net_device *dev)
752 {
753 struct net_device_stats *stats = &dev->stats;
754 struct epic_private *ep = netdev_priv(dev);
755 void __iomem *ioaddr = ep->ioaddr;
756
757 netif_stop_queue (dev);
758
759 /* Disable interrupts by clearing the interrupt mask. */
760 ew32(INTMASK, 0x00000000);
761 /* Stop the chip's Tx and Rx DMA processes. */
762 ew16(COMMAND, StopRx | StopTxDMA | StopRxDMA);
763
764 /* Update the error counts. */
765 if (er16(COMMAND) != 0xffff) {
766 stats->rx_missed_errors += er8(MPCNT);
767 stats->rx_frame_errors += er8(ALICNT);
768 stats->rx_crc_errors += er8(CRCCNT);
769 }
770
771 /* Remove the packets on the Rx queue. */
772 epic_rx(dev, RX_RING_SIZE);
773 }
774
775 static void epic_restart(struct net_device *dev)
776 {
777 struct epic_private *ep = netdev_priv(dev);
778 void __iomem *ioaddr = ep->ioaddr;
779 int i;
780
781 /* Soft reset the chip. */
782 ew32(GENCTL, 0x4001);
783
784 netdev_dbg(dev, "Restarting the EPIC chip, Rx %d/%d Tx %d/%d.\n",
785 ep->cur_rx, ep->dirty_rx, ep->dirty_tx, ep->cur_tx);
786 udelay(1);
787
788 /* This magic is documented in SMSC app note 7.15 */
789 for (i = 16; i > 0; i--)
790 ew32(TEST1, 0x0008);
791
792 #ifdef __BIG_ENDIAN
793 ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
794 #else
795 ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
796 #endif
797 ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
798 if (ep->chip_flags & MII_PWRDWN)
799 ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
800
801 for (i = 0; i < 3; i++)
802 ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));
803
804 ep->tx_threshold = TX_FIFO_THRESH;
805 ew32(TxThresh, ep->tx_threshold);
806 ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
807 ew32(PRxCDAR, ep->rx_ring_dma +
808 (ep->cur_rx % RX_RING_SIZE) * sizeof(struct epic_rx_desc));
809 ew32(PTxCDAR, ep->tx_ring_dma +
810 (ep->dirty_tx % TX_RING_SIZE) * sizeof(struct epic_tx_desc));
811
812 /* Start the chip's Rx process. */
813 set_rx_mode(dev);
814 ew32(COMMAND, StartRx | RxQueued);
815
816 /* Enable interrupts by setting the interrupt mask. */
817 ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
818 ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
819 TxUnderrun);
820
821 netdev_dbg(dev, "epic_restart() done, cmd status %4.4x, ctl %4.4x interrupt %4.4x.\n",
822 er32(COMMAND), er32(GENCTL), er32(INTSTAT));
823 }
824
825 static void check_media(struct net_device *dev)
826 {
827 struct epic_private *ep = netdev_priv(dev);
828 void __iomem *ioaddr = ep->ioaddr;
829 int mii_lpa = ep->mii_phy_cnt ? mdio_read(dev, ep->phys[0], MII_LPA) : 0;
830 int negotiated = mii_lpa & ep->mii.advertising;
831 int duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040;
832
833 if (ep->mii.force_media)
834 return;
835 if (mii_lpa == 0xffff) /* Bogus read */
836 return;
837 if (ep->mii.full_duplex != duplex) {
838 ep->mii.full_duplex = duplex;
839 netdev_info(dev, "Setting %s-duplex based on MII #%d link partner capability of %4.4x.\n",
840 ep->mii.full_duplex ? "full" : "half",
841 ep->phys[0], mii_lpa);
842 ew32(TxCtrl, ep->mii.full_duplex ? 0x7F : 0x79);
843 }
844 }
845
846 static void epic_timer(struct timer_list *t)
847 {
848 struct epic_private *ep = from_timer(ep, t, timer);
849 struct net_device *dev = ep->mii.dev;
850 void __iomem *ioaddr = ep->ioaddr;
851 int next_tick = 5*HZ;
852
853 if (debug > 3) {
854 netdev_dbg(dev, "Media monitor tick, Tx status %8.8x.\n",
855 er32(TxSTAT));
856 netdev_dbg(dev, "Other registers are IntMask %4.4x IntStatus %4.4x RxStatus %4.4x.\n",
857 er32(INTMASK), er32(INTSTAT), er32(RxSTAT));
858 }
859
860 check_media(dev);
861
862 ep->timer.expires = jiffies + next_tick;
863 add_timer(&ep->timer);
864 }
865
866 static void epic_tx_timeout(struct net_device *dev)
867 {
868 struct epic_private *ep = netdev_priv(dev);
869 void __iomem *ioaddr = ep->ioaddr;
870
871 if (debug > 0) {
872 netdev_warn(dev, "Transmit timeout using MII device, Tx status %4.4x.\n",
873 er16(TxSTAT));
874 if (debug > 1) {
875 netdev_dbg(dev, "Tx indices: dirty_tx %d, cur_tx %d.\n",
876 ep->dirty_tx, ep->cur_tx);
877 }
878 }
879 if (er16(TxSTAT) & 0x10) { /* Tx FIFO underflow. */
880 dev->stats.tx_fifo_errors++;
881 ew32(COMMAND, RestartTx);
882 } else {
883 epic_restart(dev);
884 ew32(COMMAND, TxQueued);
885 }
886
887 netif_trans_update(dev); /* prevent tx timeout */
888 dev->stats.tx_errors++;
889 if (!ep->tx_full)
890 netif_wake_queue(dev);
891 }
892
893 /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
894 static void epic_init_ring(struct net_device *dev)
895 {
896 struct epic_private *ep = netdev_priv(dev);
897 int i;
898
899 ep->tx_full = 0;
900 ep->dirty_tx = ep->cur_tx = 0;
901 ep->cur_rx = ep->dirty_rx = 0;
902 ep->rx_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);
903
904 /* Initialize all Rx descriptors. */
905 for (i = 0; i < RX_RING_SIZE; i++) {
906 ep->rx_ring[i].rxstatus = 0;
907 ep->rx_ring[i].buflength = ep->rx_buf_sz;
908 ep->rx_ring[i].next = ep->rx_ring_dma +
909 (i+1)*sizeof(struct epic_rx_desc);
910 ep->rx_skbuff[i] = NULL;
911 }
912 /* Mark the last entry as wrapping the ring. */
913 ep->rx_ring[i-1].next = ep->rx_ring_dma;
914
915 /* Fill in the Rx buffers. Handle allocation failure gracefully. */
916 for (i = 0; i < RX_RING_SIZE; i++) {
917 struct sk_buff *skb = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
918 ep->rx_skbuff[i] = skb;
919 if (skb == NULL)
920 break;
921 skb_reserve(skb, 2); /* 16 byte align the IP header. */
922 ep->rx_ring[i].bufaddr = pci_map_single(ep->pci_dev,
923 skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
924 ep->rx_ring[i].rxstatus = DescOwn;
925 }
926 ep->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
927
928 /* The Tx buffer descriptor is filled in as needed, but we
929 do need to clear the ownership bit. */
930 for (i = 0; i < TX_RING_SIZE; i++) {
931 ep->tx_skbuff[i] = NULL;
932 ep->tx_ring[i].txstatus = 0x0000;
933 ep->tx_ring[i].next = ep->tx_ring_dma +
934 (i+1)*sizeof(struct epic_tx_desc);
935 }
936 ep->tx_ring[i-1].next = ep->tx_ring_dma;
937 }
938
939 static netdev_tx_t epic_start_xmit(struct sk_buff *skb, struct net_device *dev)
940 {
941 struct epic_private *ep = netdev_priv(dev);
942 void __iomem *ioaddr = ep->ioaddr;
943 int entry, free_count;
944 u32 ctrl_word;
945 unsigned long flags;
946
947 if (skb_padto(skb, ETH_ZLEN))
948 return NETDEV_TX_OK;
949
950 /* Caution: the write order is important here, set the field with the
951 "ownership" bit last. */
952
953 /* Calculate the next Tx descriptor entry. */
954 spin_lock_irqsave(&ep->lock, flags);
955 free_count = ep->cur_tx - ep->dirty_tx;
956 entry = ep->cur_tx % TX_RING_SIZE;
957
958 ep->tx_skbuff[entry] = skb;
959 ep->tx_ring[entry].bufaddr = pci_map_single(ep->pci_dev, skb->data,
960 skb->len, PCI_DMA_TODEVICE);
961 if (free_count < TX_QUEUE_LEN/2) {/* Typical path */
962 ctrl_word = 0x100000; /* No interrupt */
963 } else if (free_count == TX_QUEUE_LEN/2) {
964 ctrl_word = 0x140000; /* Tx-done intr. */
965 } else if (free_count < TX_QUEUE_LEN - 1) {
966 ctrl_word = 0x100000; /* No Tx-done intr. */
967 } else {
968 /* Leave room for an additional entry. */
969 ctrl_word = 0x140000; /* Tx-done intr. */
970 ep->tx_full = 1;
971 }
972 ep->tx_ring[entry].buflength = ctrl_word | skb->len;
973 ep->tx_ring[entry].txstatus =
974 ((skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN) << 16)
975 | DescOwn;
976
977 ep->cur_tx++;
978 if (ep->tx_full)
979 netif_stop_queue(dev);
980
981 spin_unlock_irqrestore(&ep->lock, flags);
982 /* Trigger an immediate transmit demand. */
983 ew32(COMMAND, TxQueued);
984
985 if (debug > 4)
986 netdev_dbg(dev, "Queued Tx packet size %d to slot %d, flag %2.2x Tx status %8.8x.\n",
987 skb->len, entry, ctrl_word, er32(TxSTAT));
988
989 return NETDEV_TX_OK;
990 }
991
992 static void epic_tx_error(struct net_device *dev, struct epic_private *ep,
993 int status)
994 {
995 struct net_device_stats *stats = &dev->stats;
996
997 #ifndef final_version
998 /* There was an major error, log it. */
999 if (debug > 1)
1000 netdev_dbg(dev, "Transmit error, Tx status %8.8x.\n",
1001 status);
1002 #endif
1003 stats->tx_errors++;
1004 if (status & 0x1050)
1005 stats->tx_aborted_errors++;
1006 if (status & 0x0008)
1007 stats->tx_carrier_errors++;
1008 if (status & 0x0040)
1009 stats->tx_window_errors++;
1010 if (status & 0x0010)
1011 stats->tx_fifo_errors++;
1012 }
1013
1014 static void epic_tx(struct net_device *dev, struct epic_private *ep)
1015 {
1016 unsigned int dirty_tx, cur_tx;
1017
1018 /*
1019 * Note: if this lock becomes a problem we can narrow the locked
1020 * region at the cost of occasionally grabbing the lock more times.
1021 */
1022 cur_tx = ep->cur_tx;
1023 for (dirty_tx = ep->dirty_tx; cur_tx - dirty_tx > 0; dirty_tx++) {
1024 struct sk_buff *skb;
1025 int entry = dirty_tx % TX_RING_SIZE;
1026 int txstatus = ep->tx_ring[entry].txstatus;
1027
1028 if (txstatus & DescOwn)
1029 break; /* It still hasn't been Txed */
1030
1031 if (likely(txstatus & 0x0001)) {
1032 dev->stats.collisions += (txstatus >> 8) & 15;
1033 dev->stats.tx_packets++;
1034 dev->stats.tx_bytes += ep->tx_skbuff[entry]->len;
1035 } else
1036 epic_tx_error(dev, ep, txstatus);
1037
1038 /* Free the original skb. */
1039 skb = ep->tx_skbuff[entry];
1040 pci_unmap_single(ep->pci_dev, ep->tx_ring[entry].bufaddr,
1041 skb->len, PCI_DMA_TODEVICE);
1042 dev_kfree_skb_irq(skb);
1043 ep->tx_skbuff[entry] = NULL;
1044 }
1045
1046 #ifndef final_version
1047 if (cur_tx - dirty_tx > TX_RING_SIZE) {
1048 netdev_warn(dev, "Out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
1049 dirty_tx, cur_tx, ep->tx_full);
1050 dirty_tx += TX_RING_SIZE;
1051 }
1052 #endif
1053 ep->dirty_tx = dirty_tx;
1054 if (ep->tx_full && cur_tx - dirty_tx < TX_QUEUE_LEN - 4) {
1055 /* The ring is no longer full, allow new TX entries. */
1056 ep->tx_full = 0;
1057 netif_wake_queue(dev);
1058 }
1059 }
1060
1061 /* The interrupt handler does all of the Rx thread work and cleans up
1062 after the Tx thread. */
1063 static irqreturn_t epic_interrupt(int irq, void *dev_instance)
1064 {
1065 struct net_device *dev = dev_instance;
1066 struct epic_private *ep = netdev_priv(dev);
1067 void __iomem *ioaddr = ep->ioaddr;
1068 unsigned int handled = 0;
1069 int status;
1070
1071 status = er32(INTSTAT);
1072 /* Acknowledge all of the current interrupt sources ASAP. */
1073 ew32(INTSTAT, status & EpicNormalEvent);
1074
1075 if (debug > 4) {
1076 netdev_dbg(dev, "Interrupt, status=%#8.8x new intstat=%#8.8x.\n",
1077 status, er32(INTSTAT));
1078 }
1079
1080 if ((status & IntrSummary) == 0)
1081 goto out;
1082
1083 handled = 1;
1084
1085 if (status & EpicNapiEvent) {
1086 spin_lock(&ep->napi_lock);
1087 if (napi_schedule_prep(&ep->napi)) {
1088 epic_napi_irq_off(dev, ep);
1089 __napi_schedule(&ep->napi);
1090 }
1091 spin_unlock(&ep->napi_lock);
1092 }
1093 status &= ~EpicNapiEvent;
1094
1095 /* Check uncommon events all at once. */
1096 if (status & (CntFull | TxUnderrun | PCIBusErr170 | PCIBusErr175)) {
1097 struct net_device_stats *stats = &dev->stats;
1098
1099 if (status == EpicRemoved)
1100 goto out;
1101
1102 /* Always update the error counts to avoid overhead later. */
1103 stats->rx_missed_errors += er8(MPCNT);
1104 stats->rx_frame_errors += er8(ALICNT);
1105 stats->rx_crc_errors += er8(CRCCNT);
1106
1107 if (status & TxUnderrun) { /* Tx FIFO underflow. */
1108 stats->tx_fifo_errors++;
1109 ew32(TxThresh, ep->tx_threshold += 128);
1110 /* Restart the transmit process. */
1111 ew32(COMMAND, RestartTx);
1112 }
1113 if (status & PCIBusErr170) {
1114 netdev_err(dev, "PCI Bus Error! status %4.4x.\n",
1115 status);
1116 epic_pause(dev);
1117 epic_restart(dev);
1118 }
1119 /* Clear all error sources. */
1120 ew32(INTSTAT, status & 0x7f18);
1121 }
1122
1123 out:
1124 if (debug > 3) {
1125 netdev_dbg(dev, "exit interrupt, intr_status=%#4.4x.\n",
1126 status);
1127 }
1128
1129 return IRQ_RETVAL(handled);
1130 }
1131
1132 static int epic_rx(struct net_device *dev, int budget)
1133 {
1134 struct epic_private *ep = netdev_priv(dev);
1135 int entry = ep->cur_rx % RX_RING_SIZE;
1136 int rx_work_limit = ep->dirty_rx + RX_RING_SIZE - ep->cur_rx;
1137 int work_done = 0;
1138
1139 if (debug > 4)
1140 netdev_dbg(dev, " In epic_rx(), entry %d %8.8x.\n", entry,
1141 ep->rx_ring[entry].rxstatus);
1142
1143 if (rx_work_limit > budget)
1144 rx_work_limit = budget;
1145
1146 /* If we own the next entry, it's a new packet. Send it up. */
1147 while ((ep->rx_ring[entry].rxstatus & DescOwn) == 0) {
1148 int status = ep->rx_ring[entry].rxstatus;
1149
1150 if (debug > 4)
1151 netdev_dbg(dev, " epic_rx() status was %8.8x.\n",
1152 status);
1153 if (--rx_work_limit < 0)
1154 break;
1155 if (status & 0x2006) {
1156 if (debug > 2)
1157 netdev_dbg(dev, "epic_rx() error status was %8.8x.\n",
1158 status);
1159 if (status & 0x2000) {
1160 netdev_warn(dev, "Oversized Ethernet frame spanned multiple buffers, status %4.4x!\n",
1161 status);
1162 dev->stats.rx_length_errors++;
1163 } else if (status & 0x0006)
1164 /* Rx Frame errors are counted in hardware. */
1165 dev->stats.rx_errors++;
1166 } else {
1167 /* Malloc up new buffer, compatible with net-2e. */
1168 /* Omit the four octet CRC from the length. */
1169 short pkt_len = (status >> 16) - 4;
1170 struct sk_buff *skb;
1171
1172 if (pkt_len > PKT_BUF_SZ - 4) {
1173 netdev_err(dev, "Oversized Ethernet frame, status %x %d bytes.\n",
1174 status, pkt_len);
1175 pkt_len = 1514;
1176 }
1177 /* Check if the packet is long enough to accept without copying
1178 to a minimally-sized skbuff. */
1179 if (pkt_len < rx_copybreak &&
1180 (skb = netdev_alloc_skb(dev, pkt_len + 2)) != NULL) {
1181 skb_reserve(skb, 2); /* 16 byte align the IP header */
1182 pci_dma_sync_single_for_cpu(ep->pci_dev,
1183 ep->rx_ring[entry].bufaddr,
1184 ep->rx_buf_sz,
1185 PCI_DMA_FROMDEVICE);
1186 skb_copy_to_linear_data(skb, ep->rx_skbuff[entry]->data, pkt_len);
1187 skb_put(skb, pkt_len);
1188 pci_dma_sync_single_for_device(ep->pci_dev,
1189 ep->rx_ring[entry].bufaddr,
1190 ep->rx_buf_sz,
1191 PCI_DMA_FROMDEVICE);
1192 } else {
1193 pci_unmap_single(ep->pci_dev,
1194 ep->rx_ring[entry].bufaddr,
1195 ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
1196 skb_put(skb = ep->rx_skbuff[entry], pkt_len);
1197 ep->rx_skbuff[entry] = NULL;
1198 }
1199 skb->protocol = eth_type_trans(skb, dev);
1200 netif_receive_skb(skb);
1201 dev->stats.rx_packets++;
1202 dev->stats.rx_bytes += pkt_len;
1203 }
1204 work_done++;
1205 entry = (++ep->cur_rx) % RX_RING_SIZE;
1206 }
1207
1208 /* Refill the Rx ring buffers. */
1209 for (; ep->cur_rx - ep->dirty_rx > 0; ep->dirty_rx++) {
1210 entry = ep->dirty_rx % RX_RING_SIZE;
1211 if (ep->rx_skbuff[entry] == NULL) {
1212 struct sk_buff *skb;
1213 skb = ep->rx_skbuff[entry] = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
1214 if (skb == NULL)
1215 break;
1216 skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */
1217 ep->rx_ring[entry].bufaddr = pci_map_single(ep->pci_dev,
1218 skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
1219 work_done++;
1220 }
1221 /* AV: shouldn't we add a barrier here? */
1222 ep->rx_ring[entry].rxstatus = DescOwn;
1223 }
1224 return work_done;
1225 }
1226
1227 static void epic_rx_err(struct net_device *dev, struct epic_private *ep)
1228 {
1229 void __iomem *ioaddr = ep->ioaddr;
1230 int status;
1231
1232 status = er32(INTSTAT);
1233
1234 if (status == EpicRemoved)
1235 return;
1236 if (status & RxOverflow) /* Missed a Rx frame. */
1237 dev->stats.rx_errors++;
1238 if (status & (RxOverflow | RxFull))
1239 ew16(COMMAND, RxQueued);
1240 }
1241
1242 static int epic_poll(struct napi_struct *napi, int budget)
1243 {
1244 struct epic_private *ep = container_of(napi, struct epic_private, napi);
1245 struct net_device *dev = ep->mii.dev;
1246 void __iomem *ioaddr = ep->ioaddr;
1247 int work_done;
1248
1249 epic_tx(dev, ep);
1250
1251 work_done = epic_rx(dev, budget);
1252
1253 epic_rx_err(dev, ep);
1254
1255 if (work_done < budget && napi_complete_done(napi, work_done)) {
1256 unsigned long flags;
1257
1258 spin_lock_irqsave(&ep->napi_lock, flags);
1259
1260 ew32(INTSTAT, EpicNapiEvent);
1261 epic_napi_irq_on(dev, ep);
1262 spin_unlock_irqrestore(&ep->napi_lock, flags);
1263 }
1264
1265 return work_done;
1266 }
1267
1268 static int epic_close(struct net_device *dev)
1269 {
1270 struct epic_private *ep = netdev_priv(dev);
1271 struct pci_dev *pdev = ep->pci_dev;
1272 void __iomem *ioaddr = ep->ioaddr;
1273 struct sk_buff *skb;
1274 int i;
1275
1276 netif_stop_queue(dev);
1277 napi_disable(&ep->napi);
1278
1279 if (debug > 1)
1280 netdev_dbg(dev, "Shutting down ethercard, status was %2.2x.\n",
1281 er32(INTSTAT));
1282
1283 del_timer_sync(&ep->timer);
1284
1285 epic_disable_int(dev, ep);
1286
1287 free_irq(pdev->irq, dev);
1288
1289 epic_pause(dev);
1290
1291 /* Free all the skbuffs in the Rx queue. */
1292 for (i = 0; i < RX_RING_SIZE; i++) {
1293 skb = ep->rx_skbuff[i];
1294 ep->rx_skbuff[i] = NULL;
1295 ep->rx_ring[i].rxstatus = 0; /* Not owned by Epic chip. */
1296 ep->rx_ring[i].buflength = 0;
1297 if (skb) {
1298 pci_unmap_single(pdev, ep->rx_ring[i].bufaddr,
1299 ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
1300 dev_kfree_skb(skb);
1301 }
1302 ep->rx_ring[i].bufaddr = 0xBADF00D0; /* An invalid address. */
1303 }
1304 for (i = 0; i < TX_RING_SIZE; i++) {
1305 skb = ep->tx_skbuff[i];
1306 ep->tx_skbuff[i] = NULL;
1307 if (!skb)
1308 continue;
1309 pci_unmap_single(pdev, ep->tx_ring[i].bufaddr, skb->len,
1310 PCI_DMA_TODEVICE);
1311 dev_kfree_skb(skb);
1312 }
1313
1314 /* Green! Leave the chip in low-power mode. */
1315 ew32(GENCTL, 0x0008);
1316
1317 return 0;
1318 }
1319
1320 static struct net_device_stats *epic_get_stats(struct net_device *dev)
1321 {
1322 struct epic_private *ep = netdev_priv(dev);
1323 void __iomem *ioaddr = ep->ioaddr;
1324
1325 if (netif_running(dev)) {
1326 struct net_device_stats *stats = &dev->stats;
1327
1328 stats->rx_missed_errors += er8(MPCNT);
1329 stats->rx_frame_errors += er8(ALICNT);
1330 stats->rx_crc_errors += er8(CRCCNT);
1331 }
1332
1333 return &dev->stats;
1334 }
1335
1336 /* Set or clear the multicast filter for this adaptor.
1337 Note that we only use exclusion around actually queueing the
1338 new frame, not around filling ep->setup_frame. This is non-deterministic
1339 when re-entered but still correct. */
1340
1341 static void set_rx_mode(struct net_device *dev)
1342 {
1343 struct epic_private *ep = netdev_priv(dev);
1344 void __iomem *ioaddr = ep->ioaddr;
1345 unsigned char mc_filter[8]; /* Multicast hash filter */
1346 int i;
1347
1348 if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */
1349 ew32(RxCtrl, 0x002c);
1350 /* Unconditionally log net taps. */
1351 memset(mc_filter, 0xff, sizeof(mc_filter));
1352 } else if ((!netdev_mc_empty(dev)) || (dev->flags & IFF_ALLMULTI)) {
1353 /* There is apparently a chip bug, so the multicast filter
1354 is never enabled. */
1355 /* Too many to filter perfectly -- accept all multicasts. */
1356 memset(mc_filter, 0xff, sizeof(mc_filter));
1357 ew32(RxCtrl, 0x000c);
1358 } else if (netdev_mc_empty(dev)) {
1359 ew32(RxCtrl, 0x0004);
1360 return;
1361 } else { /* Never executed, for now. */
1362 struct netdev_hw_addr *ha;
1363
1364 memset(mc_filter, 0, sizeof(mc_filter));
1365 netdev_for_each_mc_addr(ha, dev) {
1366 unsigned int bit_nr =
1367 ether_crc_le(ETH_ALEN, ha->addr) & 0x3f;
1368 mc_filter[bit_nr >> 3] |= (1 << bit_nr);
1369 }
1370 }
1371 /* ToDo: perhaps we need to stop the Tx and Rx process here? */
1372 if (memcmp(mc_filter, ep->mc_filter, sizeof(mc_filter))) {
1373 for (i = 0; i < 4; i++)
1374 ew16(MC0 + i*4, ((u16 *)mc_filter)[i]);
1375 memcpy(ep->mc_filter, mc_filter, sizeof(mc_filter));
1376 }
1377 }
1378
1379 static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info)
1380 {
1381 struct epic_private *np = netdev_priv(dev);
1382
1383 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1384 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1385 strlcpy(info->bus_info, pci_name(np->pci_dev), sizeof(info->bus_info));
1386 }
1387
1388 static int netdev_get_link_ksettings(struct net_device *dev,
1389 struct ethtool_link_ksettings *cmd)
1390 {
1391 struct epic_private *np = netdev_priv(dev);
1392
1393 spin_lock_irq(&np->lock);
1394 mii_ethtool_get_link_ksettings(&np->mii, cmd);
1395 spin_unlock_irq(&np->lock);
1396
1397 return 0;
1398 }
1399
1400 static int netdev_set_link_ksettings(struct net_device *dev,
1401 const struct ethtool_link_ksettings *cmd)
1402 {
1403 struct epic_private *np = netdev_priv(dev);
1404 int rc;
1405
1406 spin_lock_irq(&np->lock);
1407 rc = mii_ethtool_set_link_ksettings(&np->mii, cmd);
1408 spin_unlock_irq(&np->lock);
1409
1410 return rc;
1411 }
1412
1413 static int netdev_nway_reset(struct net_device *dev)
1414 {
1415 struct epic_private *np = netdev_priv(dev);
1416 return mii_nway_restart(&np->mii);
1417 }
1418
1419 static u32 netdev_get_link(struct net_device *dev)
1420 {
1421 struct epic_private *np = netdev_priv(dev);
1422 return mii_link_ok(&np->mii);
1423 }
1424
1425 static u32 netdev_get_msglevel(struct net_device *dev)
1426 {
1427 return debug;
1428 }
1429
1430 static void netdev_set_msglevel(struct net_device *dev, u32 value)
1431 {
1432 debug = value;
1433 }
1434
1435 static int ethtool_begin(struct net_device *dev)
1436 {
1437 struct epic_private *ep = netdev_priv(dev);
1438 void __iomem *ioaddr = ep->ioaddr;
1439
1440 /* power-up, if interface is down */
1441 if (!netif_running(dev)) {
1442 ew32(GENCTL, 0x0200);
1443 ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
1444 }
1445 return 0;
1446 }
1447
1448 static void ethtool_complete(struct net_device *dev)
1449 {
1450 struct epic_private *ep = netdev_priv(dev);
1451 void __iomem *ioaddr = ep->ioaddr;
1452
1453 /* power-down, if interface is down */
1454 if (!netif_running(dev)) {
1455 ew32(GENCTL, 0x0008);
1456 ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
1457 }
1458 }
1459
1460 static const struct ethtool_ops netdev_ethtool_ops = {
1461 .get_drvinfo = netdev_get_drvinfo,
1462 .nway_reset = netdev_nway_reset,
1463 .get_link = netdev_get_link,
1464 .get_msglevel = netdev_get_msglevel,
1465 .set_msglevel = netdev_set_msglevel,
1466 .begin = ethtool_begin,
1467 .complete = ethtool_complete,
1468 .get_link_ksettings = netdev_get_link_ksettings,
1469 .set_link_ksettings = netdev_set_link_ksettings,
1470 };
1471
1472 static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1473 {
1474 struct epic_private *np = netdev_priv(dev);
1475 void __iomem *ioaddr = np->ioaddr;
1476 struct mii_ioctl_data *data = if_mii(rq);
1477 int rc;
1478
1479 /* power-up, if interface is down */
1480 if (! netif_running(dev)) {
1481 ew32(GENCTL, 0x0200);
1482 ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
1483 }
1484
1485 /* all non-ethtool ioctls (the SIOC[GS]MIIxxx ioctls) */
1486 spin_lock_irq(&np->lock);
1487 rc = generic_mii_ioctl(&np->mii, data, cmd, NULL);
1488 spin_unlock_irq(&np->lock);
1489
1490 /* power-down, if interface is down */
1491 if (! netif_running(dev)) {
1492 ew32(GENCTL, 0x0008);
1493 ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
1494 }
1495 return rc;
1496 }
1497
1498
1499 static void epic_remove_one(struct pci_dev *pdev)
1500 {
1501 struct net_device *dev = pci_get_drvdata(pdev);
1502 struct epic_private *ep = netdev_priv(dev);
1503
1504 pci_free_consistent(pdev, TX_TOTAL_SIZE, ep->tx_ring, ep->tx_ring_dma);
1505 pci_free_consistent(pdev, RX_TOTAL_SIZE, ep->rx_ring, ep->rx_ring_dma);
1506 unregister_netdev(dev);
1507 pci_iounmap(pdev, ep->ioaddr);
1508 pci_release_regions(pdev);
1509 free_netdev(dev);
1510 pci_disable_device(pdev);
1511 /* pci_power_off(pdev, -1); */
1512 }
1513
1514
1515 #ifdef CONFIG_PM
1516
1517 static int epic_suspend (struct pci_dev *pdev, pm_message_t state)
1518 {
1519 struct net_device *dev = pci_get_drvdata(pdev);
1520 struct epic_private *ep = netdev_priv(dev);
1521 void __iomem *ioaddr = ep->ioaddr;
1522
1523 if (!netif_running(dev))
1524 return 0;
1525 epic_pause(dev);
1526 /* Put the chip into low-power mode. */
1527 ew32(GENCTL, 0x0008);
1528 /* pci_power_off(pdev, -1); */
1529 return 0;
1530 }
1531
1532
1533 static int epic_resume (struct pci_dev *pdev)
1534 {
1535 struct net_device *dev = pci_get_drvdata(pdev);
1536
1537 if (!netif_running(dev))
1538 return 0;
1539 epic_restart(dev);
1540 /* pci_power_on(pdev); */
1541 return 0;
1542 }
1543
1544 #endif /* CONFIG_PM */
1545
1546
1547 static struct pci_driver epic_driver = {
1548 .name = DRV_NAME,
1549 .id_table = epic_pci_tbl,
1550 .probe = epic_init_one,
1551 .remove = epic_remove_one,
1552 #ifdef CONFIG_PM
1553 .suspend = epic_suspend,
1554 .resume = epic_resume,
1555 #endif /* CONFIG_PM */
1556 };
1557
1558
1559 static int __init epic_init (void)
1560 {
1561 /* when a module, this is printed whether or not devices are found in probe */
1562 #ifdef MODULE
1563 pr_info("%s%s\n", version, version2);
1564 #endif
1565
1566 return pci_register_driver(&epic_driver);
1567 }
1568
1569
1570 static void __exit epic_cleanup (void)
1571 {
1572 pci_unregister_driver (&epic_driver);
1573 }
1574
1575
1576 module_init(epic_init);
1577 module_exit(epic_cleanup);
Linux with added FPC-III support