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1.1 root 1: /* pcnet32.c: An AMD PCnet32 ethernet driver for linux. */
2: /*
3: * Copyright 1996,97 Thomas Bogendoerfer, 1993-1995,1998 Donald Becker
4: * Copyright 1993 United States Government as represented by the
5: * Director, National Security Agency.
6: *
7: * Derived from the lance driver written 1993-1995 by Donald Becker.
8: *
9: * This software may be used and distributed according to the terms
10: * of the GNU Public License, incorporated herein by reference.
11: *
12: * This driver is for AMD PCnet-PCI based ethercards
13: */
14:
15: static const char *version = "pcnet32.c:v0.99B 4/4/98 DJBecker/TSBogend.\n";
16:
17: /* A few user-configurable values. */
18:
19: /* Maximum events (Rx packets, etc.) to handle at each interrupt. */
20: static int max_interrupt_work = 20;
21:
22: /*
23: * Set the number of Tx and Rx buffers, using Log_2(# buffers).
24: * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
25: * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
26: */
27: #define PCNET_LOG_TX_BUFFERS 4
28: #define PCNET_LOG_RX_BUFFERS 4
29:
30: #ifdef MODULE
31: #ifdef MODVERSIONS
32: #include <linux/modversions.h>
33: #endif
34: #include <linux/module.h>
35: #include <linux/version.h>
36: #else
37: #define MOD_INC_USE_COUNT
38: #define MOD_DEC_USE_COUNT
39: #endif
40:
41: #include <linux/kernel.h>
42: #include <linux/sched.h>
43: #include <linux/string.h>
44: #include <linux/ptrace.h>
45: #include <linux/errno.h>
46: #include <linux/ioport.h>
47: #include <linux/malloc.h>
48: #include <linux/interrupt.h>
49: #include <linux/pci.h>
50: #include <linux/bios32.h>
51: #include <asm/bitops.h>
52: #include <asm/io.h>
53: #include <asm/dma.h>
54:
55: #include <linux/netdevice.h>
56: #include <linux/etherdevice.h>
57: #include <linux/skbuff.h>
58:
59: /* Driver verbosity level. 0 = no messages, 7 = wordy death.
60: Modify here, or when loading as a module. */
61: static int pcnet32_debug = 1;
62:
63: /*
64: * Theory of Operation
65: *
66: * This driver uses the same software structure as the normal lance
67: * driver. So look for a verbose description in lance.c. The differences
68: * to the normal lance driver is the use of the 32bit mode of PCnet32
69: * and PCnetPCI chips. Because these chips are 32bit chips, there is no
70: * 16MB limitation and we don't need bounce buffers.
71: */
72:
73: /*
74: * History:
75: * v0.01: Initial version
76: * only tested on Alpha Noname Board
77: * v0.02: changed IRQ handling for new interrupt scheme (dev_id)
78: * tested on a ASUS SP3G
79: * v0.10: fixed an odd problem with the 79C794 in a Compaq Deskpro XL
80: * looks like the 974 doesn't like stopping and restarting in a
81: * short period of time; now we do a reinit of the lance; the
82: * bug was triggered by doing ifconfig eth0 <ip> broadcast <addr>
83: * and hangs the machine (thanks to Klaus Liedl for debugging)
84: * v0.12: by suggestion from Donald Becker: Renamed driver to pcnet32,
85: * made it standalone (no need for lance.c)
86: * v0.13: added additional PCI detecting for special PCI devices (Compaq)
87: * v0.14: stripped down additional PCI probe (thanks to David C Niemi
88: * and [email protected] for testing this on their Compaq boxes)
89: * v0.15: added 79C965 (VLB) probe
90: * added interrupt sharing for PCI chips
91: * v0.16: fixed set_multicast_list on Alpha machines
92: * v0.17: removed hack from dev.c; now pcnet32 uses ethif_probe in Space.c
93: * v0.19: changed setting of autoselect bit
94: * v0.20: removed additional Compaq PCI probe; there is now a working one
95: * in arch/i386/bios32.c
96: * v0.21: added endian conversion for ppc, from work by [email protected]
97: * v0.22: added printing of status to ring dump
98: * v0.23: changed enet_statistics to net_devive_stats
99: * v0.99: Changes for 2.0.34 final release. -djb
100: */
101:
102:
103: #ifndef __powerpc__
104: #define le16_to_cpu(val) (val)
105: #define le32_to_cpu(val) (val)
106: #endif
107: #if (LINUX_VERSION_CODE < 0x20123)
1.1.1.2 ! root 108: //#define test_and_set_bit(val, addr) set_bit(val, addr)
1.1 root 109: #endif
110:
111: #define TX_RING_SIZE (1 << (PCNET_LOG_TX_BUFFERS))
112: #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
113: #define TX_RING_LEN_BITS ((PCNET_LOG_TX_BUFFERS) << 12)
114:
115: #define RX_RING_SIZE (1 << (PCNET_LOG_RX_BUFFERS))
116: #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
117: #define RX_RING_LEN_BITS ((PCNET_LOG_RX_BUFFERS) << 4)
118:
119: #define PKT_BUF_SZ 1544
120:
121: /* Offsets from base I/O address. */
122: enum pcnet_offsets { PCNET32_DATA=0x10, PCNET32_ADDR=0x12, PCNET32_RESET=0x14,
123: PCNET32_BUS_IF=0x16,};
124: #define PCNET32_TOTAL_SIZE 0x20
125:
126: /* The PCNET32 Rx and Tx ring descriptors. */
127: struct pcnet32_rx_head {
128: u32 base;
129: s16 buf_length;
130: s16 status;
131: u32 msg_length;
132: u32 reserved;
133: };
134:
135: struct pcnet32_tx_head {
136: u32 base;
137: s16 length;
138: s16 status;
139: u32 misc;
140: u32 reserved;
141: };
142:
143: /* The PCNET32 32-Bit initialization block, described in databook. */
144: struct pcnet32_init_block {
145: u16 mode;
146: u16 tlen_rlen;
147: u8 phys_addr[6];
148: u16 reserved;
149: u32 filter[2];
150: /* Receive and transmit ring base, along with extra bits. */
151: u32 rx_ring;
152: u32 tx_ring;
153: };
154:
155: struct pcnet32_private {
156: /* The Tx and Rx ring entries must be aligned on 16-byte boundaries
157: in 32bit mode. */
158: struct pcnet32_rx_head rx_ring[RX_RING_SIZE];
159: struct pcnet32_tx_head tx_ring[TX_RING_SIZE];
160: struct pcnet32_init_block init_block;
161: const char *name;
162: struct device *next_module;
163: /* The saved address of a sent-in-place packet/buffer, for skfree(). */
164: struct sk_buff* tx_skbuff[TX_RING_SIZE];
165: unsigned long rx_buffs; /* Address of Rx and Tx buffers. */
166: int cur_rx, cur_tx; /* The next free ring entry */
167: int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */
168: struct enet_statistics stats;
169: char tx_full;
170: unsigned long lock;
171: };
172:
173: static struct pcnet_chip_type {
174: int id_number;
175: const char *name;
176: int flags;
177: } chip_table[] = {
178: {0x2420, "PCnet/PCI 79C970", 0},
179: {0x2430, "PCnet32", 0},
180: {0x2621, "PCnet/PCI II 79C970A", 0},
181: {0x2623, "PCnet/FAST 79C971", 0},
182: {0x2624, "PCnet/FAST+ 79C972", 0},
183: {0x0, "PCnet32 (unknown)", 0},
184: };
185:
186: /* Index of functions. */
187: int pcnet32_probe(struct device *dev);
188: static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line);
189: static int pcnet32_open(struct device *dev);
190: static void pcnet32_init_ring(struct device *dev);
191: static int pcnet32_start_xmit(struct sk_buff *skb, struct device *dev);
192: static int pcnet32_rx(struct device *dev);
193: static void pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs);
194: static int pcnet32_close(struct device *dev);
195: static struct enet_statistics *pcnet32_get_stats(struct device *dev);
196: static void pcnet32_set_multicast_list(struct device *dev);
197:
198:
199: /* A list of all installed PCnet32 devices, for removing the driver module. */
200: static struct device *root_pcnet32_dev = NULL;
201:
202: int pcnet32_probe (struct device *dev)
203: {
204: static int pci_index = 0; /* Static, for multiple probe calls. */
205: int cards_found = 0;
206:
207: if ( ! pcibios_present())
208: return ENODEV;
209:
210: for (;pci_index < 0xff; pci_index++) {
211: u8 irq_line;
212: u16 pci_command, new_command;
213: unsigned char pci_bus, pci_device_fn;
214: u32 pci_ioaddr;
215:
216: if (pcibios_find_device (PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE,
217: pci_index, &pci_bus, &pci_device_fn)
218: != PCIBIOS_SUCCESSFUL)
219: break;
220:
221: pcibios_read_config_byte(pci_bus, pci_device_fn,
222: PCI_INTERRUPT_LINE, &irq_line);
223: pcibios_read_config_dword(pci_bus, pci_device_fn,
224: PCI_BASE_ADDRESS_0, &pci_ioaddr);
225: /* Remove I/O space marker in bit 0. */
226: pci_ioaddr &= ~3;
227:
228: /* Avoid already found cards from previous pcnet32_probe() calls */
229: if (check_region(pci_ioaddr, PCNET32_TOTAL_SIZE))
230: continue;
231:
232: /* Activate the card: fix for brain-damaged Win98 BIOSes. */
233: pcibios_read_config_word(pci_bus, pci_device_fn,
234: PCI_COMMAND, &pci_command);
235: new_command = pci_command | PCI_COMMAND_MASTER|PCI_COMMAND_IO;
236: if (pci_command != new_command) {
237: printk(KERN_INFO " The PCI BIOS has not enabled the AMD Ethernet"
238: " device at %2x-%2x."
239: " Updating PCI command %4.4x->%4.4x.\n",
240: pci_bus, pci_device_fn, pci_command, new_command);
241: pcibios_write_config_word(pci_bus, pci_device_fn,
242: PCI_COMMAND, new_command);
243: }
244:
245: if (pcnet32_probe1(dev, pci_ioaddr, irq_line) != 0) {
246: /* Should never happen. */
247: printk(KERN_ERR "pcnet32.c: Probe of PCI card at %#x failed.\n",
248: pci_ioaddr);
249: } else
250: dev = 0;
251: cards_found++;
252: }
253:
254: return cards_found ? 0 : -ENODEV;
255: }
256:
257:
258: /* pcnet32_probe1 */
259: static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line)
260: {
261: struct pcnet32_private *lp;
262: int i;
263: const char *chipname;
264:
265: /* check if there is really a pcnet chip on that ioaddr */
266: if ((inb(ioaddr + 14) != 0x57) || (inb(ioaddr + 15) != 0x57))
267: return ENODEV;
268:
269: inw(ioaddr+PCNET32_RESET); /* Reset the PCNET32 */
270:
271: outw(0x0000, ioaddr+PCNET32_ADDR); /* Switch to window 0 */
272: if (inw(ioaddr+PCNET32_DATA) != 0x0004)
273: return ENODEV;
274:
275: /* Get the version of the chip. */
276: outw(88, ioaddr+PCNET32_ADDR);
277: if (inw(ioaddr+PCNET32_ADDR) != 88) {
278: /* should never happen */
279: return ENODEV;
280: } else { /* Good, it's a newer chip. */
281: int chip_version = inw(ioaddr+PCNET32_DATA);
282: outw(89, ioaddr+PCNET32_ADDR);
283: chip_version |= inw(ioaddr+PCNET32_DATA) << 16;
284: if (pcnet32_debug > 2)
285: printk(" PCnet chip version is %#x.\n", chip_version);
286: if ((chip_version & 0xfff) != 0x003)
287: return ENODEV;
288: chip_version = (chip_version >> 12) & 0xffff;
289: for (i = 0; chip_table[i].id_number; i++)
290: if (chip_table[i].id_number == chip_version)
291: break;
292: chipname = chip_table[i].name;
293: }
294:
295: dev = init_etherdev(dev, 0);
296:
297: printk("%s: %s at %#3x,", dev->name, chipname, ioaddr);
298:
299: /* There is a 16 byte station address PROM at the base address.
300: The first six bytes are the station address. */
301: for (i = 0; i < 6; i++)
302: printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
303:
304: printk("\n");
305:
306: dev->base_addr = ioaddr;
307: request_region(ioaddr, PCNET32_TOTAL_SIZE, dev->name);
308:
309: /* Data structures used by the PCnet32 are 16byte aligned and DMAble. */
310: lp = (struct pcnet32_private *)
311: (((unsigned long)kmalloc(sizeof(*lp)+15, GFP_DMA | GFP_KERNEL)+15) & ~15);
312:
313: memset(lp, 0, sizeof(*lp));
314: dev->priv = lp;
315:
316: lp->next_module = root_pcnet32_dev;
317: root_pcnet32_dev = dev;
318:
319: lp->name = chipname;
320: lp->rx_buffs = (unsigned long) kmalloc(PKT_BUF_SZ*RX_RING_SIZE, GFP_DMA | GFP_KERNEL);
321:
322: lp->init_block.mode = le16_to_cpu(0x0003); /* Disable Rx and Tx. */
323: lp->init_block.tlen_rlen = le16_to_cpu(TX_RING_LEN_BITS | RX_RING_LEN_BITS);
324: for (i = 0; i < 6; i++)
325: lp->init_block.phys_addr[i] = dev->dev_addr[i];
326: lp->init_block.filter[0] = 0x00000000;
327: lp->init_block.filter[1] = 0x00000000;
328: lp->init_block.rx_ring = (u32)le32_to_cpu(virt_to_bus(lp->rx_ring));
329: lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring));
330:
331: /* switch pcnet32 to 32bit mode */
332: outw(0x0014, ioaddr+PCNET32_ADDR);
333: outw(0x0002, ioaddr+PCNET32_BUS_IF);
334:
335: outw(0x0001, ioaddr+PCNET32_ADDR);
336: inw(ioaddr+PCNET32_ADDR);
337: outw(virt_to_bus(&lp->init_block) & 0xffff, ioaddr+PCNET32_DATA);
338: outw(0x0002, ioaddr+PCNET32_ADDR);
339: inw(ioaddr+PCNET32_ADDR);
340: outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA);
341: outw(0x0000, ioaddr+PCNET32_ADDR);
342: inw(ioaddr+PCNET32_ADDR);
343:
344: dev->irq = irq_line;
345:
346: if (pcnet32_debug > 0)
347: printk(version);
348:
349: /* The PCNET32-specific entries in the device structure. */
350: dev->open = &pcnet32_open;
351: dev->hard_start_xmit = &pcnet32_start_xmit;
352: dev->stop = &pcnet32_close;
353: dev->get_stats = &pcnet32_get_stats;
354: dev->set_multicast_list = &pcnet32_set_multicast_list;
355:
356: /* Fill in the generic fields of the device structure. */
357: ether_setup(dev);
358: return 0;
359: }
360:
361:
362: static int
363: pcnet32_open(struct device *dev)
364: {
365: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
366: unsigned int ioaddr = dev->base_addr;
367: int i;
368:
369: if (dev->irq == 0 ||
370: request_irq(dev->irq, &pcnet32_interrupt, SA_SHIRQ,
371: dev->name, (void *)dev)) {
372: return -EAGAIN;
373: }
374: MOD_INC_USE_COUNT;
375:
376: /* Reset the PCNET32 */
377: inw(ioaddr+PCNET32_RESET);
378:
379: /* switch pcnet32 to 32bit mode */
380: outw(0x0014, ioaddr+PCNET32_ADDR);
381: outw(0x0002, ioaddr+PCNET32_BUS_IF);
382:
383: /* Turn on auto-select of media (AUI, BNC). */
384: outw(0x0002, ioaddr+PCNET32_ADDR);
385: /* only touch autoselect bit */
386: outw(inw(ioaddr+PCNET32_BUS_IF) | 0x0002, ioaddr+PCNET32_BUS_IF);
387:
388: if (pcnet32_debug > 1)
389: printk("%s: pcnet32_open() irq %d tx/rx rings %#x/%#x init %#x.\n",
390: dev->name, dev->irq,
391: (u32) virt_to_bus(lp->tx_ring),
392: (u32) virt_to_bus(lp->rx_ring),
393: (u32) virt_to_bus(&lp->init_block));
394:
395: /* check for ATLAS T1/E1 LAW card */
396: if (dev->dev_addr[0] == 0x00 && dev->dev_addr[1] == 0xe0 && dev->dev_addr[2] == 0x75) {
397: /* select GPSI mode */
398: lp->init_block.mode = 0x0100;
399: outw(0x0002, ioaddr+PCNET32_ADDR);
400: outw(inw(ioaddr+PCNET32_BUS_IF) & ~2, ioaddr+PCNET32_BUS_IF);
401: /* switch full duplex on */
402: outw(0x0009, ioaddr+PCNET32_ADDR);
403: outw(inw(ioaddr+PCNET32_BUS_IF) | 1, ioaddr+PCNET32_BUS_IF);
404: } else
405: lp->init_block.mode = 0x0000;
406: lp->init_block.filter[0] = 0x00000000;
407: lp->init_block.filter[1] = 0x00000000;
408: pcnet32_init_ring(dev);
409:
410: /* Re-initialize the PCNET32, and start it when done. */
411: outw(0x0001, ioaddr+PCNET32_ADDR);
412: outw(virt_to_bus(&lp->init_block) &0xffff, ioaddr+PCNET32_DATA);
413: outw(0x0002, ioaddr+PCNET32_ADDR);
414: outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA);
415:
416: outw(0x0004, ioaddr+PCNET32_ADDR);
417: outw(0x0915, ioaddr+PCNET32_DATA);
418:
419: outw(0x0000, ioaddr+PCNET32_ADDR);
420: outw(0x0001, ioaddr+PCNET32_DATA);
421:
422: dev->tbusy = 0;
423: dev->interrupt = 0;
424: dev->start = 1;
425: i = 0;
426: while (i++ < 100)
427: if (inw(ioaddr+PCNET32_DATA) & 0x0100)
428: break;
429: /*
430: * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
431: * reports that doing so triggers a bug in the '974.
432: */
433: outw(0x0042, ioaddr+PCNET32_DATA);
434:
435: if (pcnet32_debug > 2)
436: printk("%s: PCNET32 open after %d ticks, init block %#x csr0 %4.4x.\n",
437: dev->name, i, (u32) virt_to_bus(&lp->init_block), inw(ioaddr+PCNET32_DATA));
438:
439: return 0; /* Always succeed */
440: }
441:
442: /*
443: * The LANCE has been halted for one reason or another (busmaster memory
444: * arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
445: * etc.). Modern LANCE variants always reload their ring-buffer
446: * configuration when restarted, so we must reinitialize our ring
447: * context before restarting. As part of this reinitialization,
448: * find all packets still on the Tx ring and pretend that they had been
449: * sent (in effect, drop the packets on the floor) - the higher-level
450: * protocols will time out and retransmit. It'd be better to shuffle
451: * these skbs to a temp list and then actually re-Tx them after
452: * restarting the chip, but I'm too lazy to do so right now. [email protected]
453: */
454:
455: static void
456: pcnet32_purge_tx_ring(struct device *dev)
457: {
458: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
459: int i;
460:
461: for (i = 0; i < TX_RING_SIZE; i++) {
462: if (lp->tx_skbuff[i]) {
463: dev_kfree_skb(lp->tx_skbuff[i], FREE_WRITE);
464: lp->tx_skbuff[i] = NULL;
465: }
466: }
467: }
468:
469:
470: /* Initialize the PCNET32 Rx and Tx rings. */
471: static void
472: pcnet32_init_ring(struct device *dev)
473: {
474: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
475: int i;
476:
477: lp->lock = 0, lp->tx_full = 0;
478: lp->cur_rx = lp->cur_tx = 0;
479: lp->dirty_rx = lp->dirty_tx = 0;
480:
481: for (i = 0; i < RX_RING_SIZE; i++) {
482: lp->rx_ring[i].base = (u32)le32_to_cpu(virt_to_bus((char *)lp->rx_buffs + i*PKT_BUF_SZ));
483: lp->rx_ring[i].buf_length = le16_to_cpu(-PKT_BUF_SZ);
484: lp->rx_ring[i].status = le16_to_cpu(0x8000);
485: }
486: /* The Tx buffer address is filled in as needed, but we do need to clear
487: the upper ownership bit. */
488: for (i = 0; i < TX_RING_SIZE; i++) {
489: lp->tx_ring[i].base = 0;
490: lp->tx_ring[i].status = 0;
491: }
492:
493: lp->init_block.tlen_rlen = TX_RING_LEN_BITS | RX_RING_LEN_BITS;
494: for (i = 0; i < 6; i++)
495: lp->init_block.phys_addr[i] = dev->dev_addr[i];
496: lp->init_block.rx_ring = (u32)le32_to_cpu(virt_to_bus(lp->rx_ring));
497: lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring));
498: }
499:
500: static void
501: pcnet32_restart(struct device *dev, unsigned int csr0_bits, int must_reinit)
502: {
503: int i;
504: unsigned int ioaddr = dev->base_addr;
505:
506: pcnet32_purge_tx_ring(dev);
507: pcnet32_init_ring(dev);
508:
509: outw(0x0000, ioaddr + PCNET32_ADDR);
510: /* ReInit Ring */
511: outw(0x0001, ioaddr + PCNET32_DATA);
512: i = 0;
513: while (i++ < 100)
514: if (inw(ioaddr+PCNET32_DATA) & 0x0100)
515: break;
516:
517: outw(csr0_bits, ioaddr + PCNET32_DATA);
518: }
519:
520: static int
521: pcnet32_start_xmit(struct sk_buff *skb, struct device *dev)
522: {
523: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
524: unsigned int ioaddr = dev->base_addr;
525: int entry;
526: unsigned long flags;
527:
528: /* Transmitter timeout, serious problems. */
529: if (dev->tbusy) {
530: int tickssofar = jiffies - dev->trans_start;
531: if (tickssofar < 20)
532: return 1;
533: outw(0, ioaddr+PCNET32_ADDR);
534: printk("%s: transmit timed out, status %4.4x, resetting.\n",
535: dev->name, inw(ioaddr+PCNET32_DATA));
536: outw(0x0004, ioaddr+PCNET32_DATA);
537: lp->stats.tx_errors++;
538: #ifndef final_version
539: {
540: int i;
541: printk(" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
542: lp->dirty_tx, lp->cur_tx, lp->tx_full ? " (full)" : "",
543: lp->cur_rx);
544: for (i = 0 ; i < RX_RING_SIZE; i++)
545: printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ",
546: lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
547: lp->rx_ring[i].msg_length, (unsigned)lp->rx_ring[i].status);
548: for (i = 0 ; i < TX_RING_SIZE; i++)
549: printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ",
550: lp->tx_ring[i].base, -lp->tx_ring[i].length,
551: lp->tx_ring[i].misc, (unsigned)lp->tx_ring[i].status);
552: printk("\n");
553: }
554: #endif
555: pcnet32_restart(dev, 0x0042, 1);
556:
557: dev->tbusy = 0;
558: dev->trans_start = jiffies;
559:
560: return 0;
561: }
562:
563: if (pcnet32_debug > 3) {
564: outw(0x0000, ioaddr+PCNET32_ADDR);
565: printk("%s: pcnet32_start_xmit() called, csr0 %4.4x.\n", dev->name,
566: inw(ioaddr+PCNET32_DATA));
567: outw(0x0000, ioaddr+PCNET32_DATA);
568: }
569:
570: /* Block a timer-based transmit from overlapping. This could better be
571: done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
572: if (test_and_set_bit(0, (void*)&dev->tbusy) != 0) {
573: printk("%s: Transmitter access conflict.\n", dev->name);
574: return 1;
575: }
576:
577: if (test_and_set_bit(0, (void*)&lp->lock) != 0) {
578: if (pcnet32_debug > 0)
579: printk("%s: tx queue lock!.\n", dev->name);
580: /* don't clear dev->tbusy flag. */
581: return 1;
582: }
583:
584: /* Fill in a Tx ring entry */
585:
586: /* Mask to ring buffer boundary. */
587: entry = lp->cur_tx & TX_RING_MOD_MASK;
588:
589: /* Caution: the write order is important here, set the base address
590: with the "ownership" bits last. */
591:
592: lp->tx_ring[entry].length = le16_to_cpu(-skb->len);
593:
594: lp->tx_ring[entry].misc = 0x00000000;
595:
596: lp->tx_skbuff[entry] = skb;
597: lp->tx_ring[entry].base = (u32)le32_to_cpu(virt_to_bus(skb->data));
598: lp->tx_ring[entry].status = le16_to_cpu(0x8300);
599:
600: lp->cur_tx++;
601:
602: /* Trigger an immediate send poll. */
603: outw(0x0000, ioaddr+PCNET32_ADDR);
604: outw(0x0048, ioaddr+PCNET32_DATA);
605:
606: dev->trans_start = jiffies;
607:
608: save_flags(flags);
609: cli();
610: lp->lock = 0;
611: if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0)
612: clear_bit(0, (void*)&dev->tbusy);
613: else
614: lp->tx_full = 1;
615: restore_flags(flags);
616:
617: return 0;
618: }
619:
620: /* The PCNET32 interrupt handler. */
621: static void
622: pcnet32_interrupt(int irq, void *dev_id, struct pt_regs * regs)
623: {
624: struct device *dev = (struct device *)dev_id;
625: struct pcnet32_private *lp;
626: unsigned int csr0, ioaddr;
627: int boguscnt = max_interrupt_work;
628: int must_restart;
629:
630: if (dev == NULL) {
631: printk ("pcnet32_interrupt(): irq %d for unknown device.\n", irq);
632: return;
633: }
634:
635: ioaddr = dev->base_addr;
636: lp = (struct pcnet32_private *)dev->priv;
637: if (dev->interrupt)
638: printk("%s: Re-entering the interrupt handler.\n", dev->name);
639:
640: dev->interrupt = 1;
641:
642: outw(0x00, dev->base_addr + PCNET32_ADDR);
643: while ((csr0 = inw(dev->base_addr + PCNET32_DATA)) & 0x8600
644: && --boguscnt >= 0) {
645: /* Acknowledge all of the current interrupt sources ASAP. */
646: outw(csr0 & ~0x004f, dev->base_addr + PCNET32_DATA);
647:
648: must_restart = 0;
649:
650: if (pcnet32_debug > 5)
651: printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n",
652: dev->name, csr0, inw(dev->base_addr + PCNET32_DATA));
653:
654: if (csr0 & 0x0400) /* Rx interrupt */
655: pcnet32_rx(dev);
656:
657: if (csr0 & 0x0200) { /* Tx-done interrupt */
658: int dirty_tx = lp->dirty_tx;
659:
660: while (dirty_tx < lp->cur_tx) {
661: int entry = dirty_tx & TX_RING_MOD_MASK;
662: int status = (short)le16_to_cpu(lp->tx_ring[entry].status);
663:
664: if (status < 0)
665: break; /* It still hasn't been Txed */
666:
667: lp->tx_ring[entry].base = 0;
668:
669: if (status & 0x4000) {
670: /* There was an major error, log it. */
671: int err_status = le16_to_cpu(lp->tx_ring[entry].misc);
672: lp->stats.tx_errors++;
673: if (err_status & 0x04000000) lp->stats.tx_aborted_errors++;
674: if (err_status & 0x08000000) lp->stats.tx_carrier_errors++;
675: if (err_status & 0x10000000) lp->stats.tx_window_errors++;
676: if (err_status & 0x40000000) {
677: /* Ackk! On FIFO errors the Tx unit is turned off! */
678: lp->stats.tx_fifo_errors++;
679: /* Remove this verbosity later! */
680: printk("%s: Tx FIFO error! Status %4.4x.\n",
681: dev->name, csr0);
682: /* Restart the chip. */
683: must_restart = 1;
684: }
685: } else {
686: if (status & 0x1800)
687: lp->stats.collisions++;
688: lp->stats.tx_packets++;
689: }
690:
691: /* We must free the original skb */
692: if (lp->tx_skbuff[entry]) {
693: dev_kfree_skb(lp->tx_skbuff[entry], FREE_WRITE);
694: lp->tx_skbuff[entry] = 0;
695: }
696: dirty_tx++;
697: }
698:
699: #ifndef final_version
700: if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
701: printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
702: dirty_tx, lp->cur_tx, lp->tx_full);
703: dirty_tx += TX_RING_SIZE;
704: }
705: #endif
706:
707: if (lp->tx_full && dev->tbusy
708: && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
709: /* The ring is no longer full, clear tbusy. */
710: lp->tx_full = 0;
711: clear_bit(0, (void*)&dev->tbusy);
712: mark_bh(NET_BH);
713: }
714:
715: lp->dirty_tx = dirty_tx;
716: }
717:
718: /* Log misc errors. */
719: if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
720: if (csr0 & 0x1000) {
721: /*
722: * this happens when our receive ring is full. This
723: * shouldn't be a problem as we will see normal rx
724: * interrupts for the frames in the receive ring. But
725: * there are some PCI chipsets (I can reproduce this
726: * on SP3G with Intel saturn chipset) which have some-
727: * times problems and will fill up the receive ring
728: * with error descriptors. In this situation we don't
729: * get a rx interrupt, but a missed frame interrupt
730: * sooner or later. So we try to clean up our receive
731: * ring here.
732: */
733: pcnet32_rx(dev);
734: lp->stats.rx_errors++; /* Missed a Rx frame. */
735: }
736: if (csr0 & 0x0800) {
737: printk("%s: Bus master arbitration failure, status %4.4x.\n",
738: dev->name, csr0);
739: /* Restart the chip. */
740: must_restart = 1;
741: }
742:
743: if (must_restart) {
744: /* stop the chip to clear the error condition, then restart */
745: outw(0x0000, dev->base_addr + PCNET32_ADDR);
746: outw(0x0004, dev->base_addr + PCNET32_DATA);
747: pcnet32_restart(dev, 0x0002, 0);
748: }
749: }
750:
751: /* Clear any other interrupt, and set interrupt enable. */
752: outw(0x0000, dev->base_addr + PCNET32_ADDR);
753: outw(0x7940, dev->base_addr + PCNET32_DATA);
754:
755: if (pcnet32_debug > 4)
756: printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
757: dev->name, inw(ioaddr + PCNET32_ADDR),
758: inw(dev->base_addr + PCNET32_DATA));
759:
760: dev->interrupt = 0;
761: return;
762: }
763:
764: static int
765: pcnet32_rx(struct device *dev)
766: {
767: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
768: int entry = lp->cur_rx & RX_RING_MOD_MASK;
769: int i;
770:
771: /* If we own the next entry, it's a new packet. Send it up. */
772: while ((short)le16_to_cpu(lp->rx_ring[entry].status) >= 0) {
773: int status = (short)le16_to_cpu(lp->rx_ring[entry].status) >> 8;
774:
775: if (status != 0x03) { /* There was an error. */
776: /* There is a tricky error noted by John Murphy,
777: <[email protected]> to Russ Nelson: Even with full-sized
778: buffers it's possible for a jabber packet to use two
779: buffers, with only the last correctly noting the error. */
780: if (status & 0x01) /* Only count a general error at the */
781: lp->stats.rx_errors++; /* end of a packet.*/
782: if (status & 0x20) lp->stats.rx_frame_errors++;
783: if (status & 0x10) lp->stats.rx_over_errors++;
784: if (status & 0x08) lp->stats.rx_crc_errors++;
785: if (status & 0x04) lp->stats.rx_fifo_errors++;
786: lp->rx_ring[entry].status &= le16_to_cpu(0x03ff);
787: }
788: else
789: {
790: /* Malloc up new buffer, compatible with net-2e. */
791: short pkt_len = (le32_to_cpu(lp->rx_ring[entry].msg_length) & 0xfff)-4;
792: struct sk_buff *skb;
793:
794: if(pkt_len < 60) {
795: printk("%s: Runt packet!\n",dev->name);
796: lp->stats.rx_errors++;
797: } else {
798: skb = dev_alloc_skb(pkt_len+2);
799: if (skb == NULL) {
800: printk("%s: Memory squeeze, deferring packet.\n",
801: dev->name);
802: for (i=0; i < RX_RING_SIZE; i++)
803: if ((short)le16_to_cpu(lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].status) < 0)
804: break;
805:
806: if (i > RX_RING_SIZE -2)
807: {
808: lp->stats.rx_dropped++;
809: lp->rx_ring[entry].status |= le16_to_cpu(0x8000);
810: lp->cur_rx++;
811: }
812: break;
813: }
814: skb->dev = dev;
815: skb_reserve(skb,2); /* 16 byte align */
816: skb_put(skb,pkt_len); /* Make room */
817: eth_copy_and_sum(skb,
818: (unsigned char *)bus_to_virt(le32_to_cpu(lp->rx_ring[entry].base)),
819: pkt_len,0);
820: skb->protocol=eth_type_trans(skb,dev);
821: netif_rx(skb);
822: lp->stats.rx_packets++;
823: }
824: }
825: /* The docs say that the buffer length isn't touched, but Andrew Boyd
826: of QNX reports that some revs of the 79C965 clear it. */
827: lp->rx_ring[entry].buf_length = le16_to_cpu(-PKT_BUF_SZ);
828: lp->rx_ring[entry].status |= le16_to_cpu(0x8000);
829: entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
830: }
831:
832: /* We should check that at least two ring entries are free. If not,
833: we should free one and mark stats->rx_dropped++. */
834:
835: return 0;
836: }
837:
838: static int
839: pcnet32_close(struct device *dev)
840: {
841: unsigned int ioaddr = dev->base_addr;
842: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
843:
844: dev->start = 0;
845: set_bit(0, (void*)&dev->tbusy);
846:
847: outw(112, ioaddr+PCNET32_ADDR);
848: lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA);
849:
850: outw(0, ioaddr+PCNET32_ADDR);
851:
852: if (pcnet32_debug > 1)
853: printk("%s: Shutting down ethercard, status was %2.2x.\n",
854: dev->name, inw(ioaddr+PCNET32_DATA));
855:
856: /* We stop the PCNET32 here -- it occasionally polls
857: memory if we don't. */
858: outw(0x0004, ioaddr+PCNET32_DATA);
859:
860: free_irq(dev->irq, dev);
861: MOD_DEC_USE_COUNT;
862:
863: return 0;
864: }
865:
866: static struct enet_statistics *pcnet32_get_stats(struct device *dev)
867: {
868: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
869: unsigned int ioaddr = dev->base_addr;
870: unsigned short saved_addr;
871: unsigned long flags;
872:
873: save_flags(flags);
874: cli();
875: saved_addr = inw(ioaddr+PCNET32_ADDR);
876: outw(112, ioaddr+PCNET32_ADDR);
877: lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA);
878: outw(saved_addr, ioaddr+PCNET32_ADDR);
879: restore_flags(flags);
880:
881: return &lp->stats;
882: }
883:
884: /* Set or clear the multicast filter for this adaptor.
885: */
886:
887: static void pcnet32_set_multicast_list(struct device *dev)
888: {
889: unsigned int ioaddr = dev->base_addr;
890: struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
891:
892: if (dev->flags&IFF_PROMISC) {
893: /* Log any net taps. */
894: printk("%s: Promiscuous mode enabled.\n", dev->name);
895: lp->init_block.mode |= 0x8000;
896: } else {
897: int num_addrs=dev->mc_count;
898: if(dev->flags&IFF_ALLMULTI)
899: num_addrs=1;
900: /* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */
901: memset(lp->init_block.filter , (num_addrs == 0) ? 0 : -1, sizeof(lp->init_block.filter));
902: lp->init_block.mode &= ~0x8000;
903: }
904:
905: outw(0, ioaddr+PCNET32_ADDR);
906: outw(0x0004, ioaddr+PCNET32_DATA); /* Temporarily stop the lance. */
907:
908: pcnet32_restart(dev, 0x0042, 0); /* Resume normal operation */
909:
910: }
911:
912:
913: #ifdef MODULE
914: #if LINUX_VERSION_CODE > 0x20118
915: MODULE_AUTHOR("Donald Becker <[email protected]>");
916: MODULE_DESCRIPTION("AMD PCnet/PCI ethernet driver");
917: MODULE_PARM(debug, "i");
918: MODULE_PARM(max_interrupt_work, "i");
919: MODULE_PARM(rx_copybreak, "i");
920: MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
921: MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
922: #endif
923:
924: /* An additional parameter that may be passed in... */
925: static int debug = -1;
926:
927: int
928: init_module(void)
929: {
930: if (debug >= 0)
931: pcnet32_debug = debug;
932:
933: #ifdef CARDBUS
934: register_driver(&pcnet32_ops);
935: return 0;
936: #else
937: return pcnet32_probe(NULL);
938: #endif
939: }
940:
941: void
942: cleanup_module(void)
943: {
944: struct device *next_dev;
945:
946: #ifdef CARDBUS
947: unregister_driver(&pcnet32_ops);
948: #endif
949:
950: /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
951: while (root_pcnet32_dev) {
952: next_dev = ((struct pcnet32_private *)root_pcnet32_dev->priv)->next_module;
953: unregister_netdev(root_pcnet32_dev);
954: release_region(root_pcnet32_dev->base_addr, PCNET32_TOTAL_SIZE);
955: kfree(root_pcnet32_dev);
956: root_pcnet32_dev = next_dev;
957: }
958: }
959:
960: #endif /* MODULE */
961:
962:
963: /*
964: * Local variables:
965: * compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c pcnet32.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
966: * c-indent-level: 4
967: * c-basic-offset: 4
968: * tab-width: 4
969: * End:
970: */
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