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1.1 root 1: /* natsemi.c: A Linux PCI Ethernet driver for the NatSemi DP83810 series. */
2: /*
3: Written/copyright 1999-2003 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. License for under other terms may be
11: available. Contact the original author for details.
12:
13: The original author may be reached as [email protected], or at
14: Scyld Computing Corporation
15: 914 Bay Ridge Road, Suite 220
16: Annapolis MD 21403
17:
18: Support information and updates available at
19: http://www.scyld.com/network/natsemi.html
20: The information and support mailing lists are based at
21: http://www.scyld.com/mailman/listinfo/
22: */
23:
24: /* These identify the driver base version and may not be removed. */
25: static const char version1[] =
26: "natsemi.c:v1.17a 8/09/2003 Written by Donald Becker <[email protected]>\n";
27: static const char version2[] =
28: " http://www.scyld.com/network/natsemi.html\n";
29: /* Updated to recommendations in pci-skeleton v2.11. */
30:
31: /* Automatically extracted configuration info:
32: probe-func: natsemi_probe
33: config-in: tristate 'National Semiconductor DP8381x series PCI Ethernet support' CONFIG_NATSEMI
34:
35: c-help-name: National Semiconductor DP8381x series PCI Ethernet support
36: c-help-symbol: CONFIG_NATSEMI
37: c-help: This driver is for the National Semiconductor DP83810 series,
38: c-help: including the 83815 chip.
39: c-help: Usage information and updates are available from
40: c-help: http://www.scyld.com/network/natsemi.html
41: */
42:
43: /* The user-configurable values.
44: These may be modified when a driver module is loaded.*/
45:
46: /* Message enable level: 0..31 = no..all messages. See NETIF_MSG docs. */
47: static int debug = 2;
48:
49: /* Maximum events (Rx packets, etc.) to handle at each interrupt. */
50: static int max_interrupt_work = 20;
51:
52: /* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
53: This chip uses a 512 element hash table based on the Ethernet CRC.
54: Some chip versions are reported to have unreliable multicast filter
55: circuitry. To work around an observed problem set this value to '0',
56: which will immediately switch to Rx-all-multicast.
57: */
58: static int multicast_filter_limit = 100;
59:
60: /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
61: Setting to > 1518 effectively disables this feature.
62: This chip can only receive into aligned buffers, so architectures such
63: as the Alpha AXP might benefit from a copy-align.
64: */
65: static int rx_copybreak = 0;
66:
67: /* Used to pass the media type, etc.
68: Both 'options[]' and 'full_duplex[]' should exist for driver
69: interoperability, however setting full_duplex[] is deprecated.
70: The media type is usually passed in 'options[]'.
71: The default is autonegotation for speed and duplex.
72: This should rarely be overridden.
73: Use option values 0x10/0x20 for 10Mbps, 0x100,0x200 for 100Mbps.
74: Use option values 0x10 and 0x100 for forcing half duplex fixed speed.
75: Use option values 0x20 and 0x200 for forcing full duplex operation.
76: */
77: #define MAX_UNITS 8 /* More are supported, limit only on options */
78: static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
79: static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
80:
81: /* Operational parameters that are set at compile time. */
82:
83: /* Keep the ring sizes a power of two for compile efficiency.
84: Understand the implications before changing these settings!
85: The compiler will convert <unsigned>'%'<2^N> into a bit mask.
86: Making the Tx ring too large decreases the effectiveness of channel
87: bonding and packet priority.
88: Too-large receive rings waste memory and confound network buffer limits. */
89: #define TX_RING_SIZE 16
90: #define TX_QUEUE_LEN 10 /* Limit ring entries actually used, min 4. */
91: #define RX_RING_SIZE 32
92:
93: /* Operational parameters that usually are not changed. */
94: /* Time in jiffies before concluding the transmitter is hung.
95: Re-autonegotiation may take up to 3 seconds.
96: */
97: #define TX_TIMEOUT (6*HZ)
98:
99: /* Allocation size of Rx buffers with normal sized Ethernet frames.
100: Do not change this value without good reason. This is not a limit,
101: but a way to keep a consistent allocation size among drivers.
102: */
103: #define PKT_BUF_SZ 1536
104:
105: #ifndef __KERNEL__
106: #define __KERNEL__
107: #endif
108: #if !defined(__OPTIMIZE__)
109: #warning You must compile this file with the correct options!
110: #warning See the last lines of the source file.
111: #error You must compile this driver with "-O".
112: #endif
113:
114: /* Include files, designed to support most kernel versions 2.0.0 and later. */
115: #include <linux/config.h>
116: #if defined(CONFIG_SMP) && ! defined(__SMP__)
117: #define __SMP__
118: #endif
119: #if defined(MODULE) && defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
120: #define MODVERSIONS
121: #endif
122:
123: #include <linux/version.h>
124: #if defined(MODVERSIONS)
125: #include <linux/modversions.h>
126: #endif
127: #include <linux/module.h>
128:
129: #include <linux/kernel.h>
130: #include <linux/string.h>
131: #include <linux/timer.h>
132: #include <linux/errno.h>
133: #include <linux/ioport.h>
134: #if LINUX_VERSION_CODE >= 0x20400
135: #include <linux/slab.h>
136: #else
137: #include <linux/malloc.h>
138: #endif
139: #include <linux/interrupt.h>
140: #include <linux/pci.h>
141: #include <linux/netdevice.h>
142: #include <linux/etherdevice.h>
143: #include <linux/skbuff.h>
144: #include <asm/processor.h> /* Processor type for cache alignment. */
145: #include <asm/bitops.h>
146: #include <asm/io.h>
147:
148: #ifdef INLINE_PCISCAN
149: #include "k_compat.h"
150: #else
151: #include "pci-scan.h"
152: #include "kern_compat.h"
153: #endif
154:
155: /* Condensed operations for readability. */
156: #define virt_to_le32desc(addr) cpu_to_le32(virt_to_bus(addr))
157: #define le32desc_to_virt(addr) bus_to_virt(le32_to_cpu(addr))
158:
159: #if (LINUX_VERSION_CODE >= 0x20100) && defined(MODULE)
160: char kernel_version[] = UTS_RELEASE;
161: #endif
162:
163: MODULE_AUTHOR("Donald Becker <[email protected]>");
164: MODULE_DESCRIPTION("National Semiconductor DP83810 series PCI Ethernet driver");
165: MODULE_LICENSE("GPL");
166: MODULE_PARM(debug, "i");
167: MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
168: MODULE_PARM(rx_copybreak, "i");
169: MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
170: MODULE_PARM(multicast_filter_limit, "i");
171: MODULE_PARM(max_interrupt_work, "i");
172: MODULE_PARM_DESC(debug, "Driver message level (0-31)");
173: MODULE_PARM_DESC(options, "Force transceiver type or fixed speed+duplex");
174: MODULE_PARM_DESC(max_interrupt_work,
175: "Driver maximum events handled per interrupt");
176: MODULE_PARM_DESC(full_duplex,
177: "Non-zero to force full duplex, non-negotiated link "
178: "(deprecated).");
179: MODULE_PARM_DESC(rx_copybreak,
180: "Breakpoint in bytes for copy-only-tiny-frames");
181: MODULE_PARM_DESC(multicast_filter_limit,
182: "Multicast addresses before switching to Rx-all-multicast");
183:
184: /*
185: Theory of Operation
186:
187: I. Board Compatibility
188:
189: This driver is designed for National Semiconductor DP83815 PCI Ethernet NIC.
190: It also works with other chips in in the DP83810 series.
191: The most common board is the Netgear FA311 using the 83815.
192:
193: II. Board-specific settings
194:
195: This driver requires the PCI interrupt line to be valid.
196: It honors the EEPROM-set values.
197:
198: III. Driver operation
199:
200: IIIa. Ring buffers
201:
202: This driver uses two statically allocated fixed-size descriptor lists
203: formed into rings by a branch from the final descriptor to the beginning of
204: the list. The ring sizes are set at compile time by RX/TX_RING_SIZE.
205: The NatSemi design uses a 'next descriptor' pointer that the driver forms
206: into a list, thus rings can be arbitrarily sized. Before changing the
207: ring sizes you should understand the flow and cache effects of the
208: full/available/empty hysteresis.
209:
210: IIIb/c. Transmit/Receive Structure
211:
212: This driver uses a zero-copy receive and transmit scheme.
213: The driver allocates full frame size skbuffs for the Rx ring buffers at
214: open() time and passes the skb->data field to the chip as receive data
215: buffers. When an incoming frame is less than RX_COPYBREAK bytes long,
216: a fresh skbuff is allocated and the frame is copied to the new skbuff.
217: When the incoming frame is larger, the skbuff is passed directly up the
218: protocol stack. Buffers consumed this way are replaced by newly allocated
219: skbuffs in a later phase of receives.
220:
221: The RX_COPYBREAK value is chosen to trade-off the memory wasted by
222: using a full-sized skbuff for small frames vs. the copying costs of larger
223: frames. New boards are typically used in generously configured machines
224: and the underfilled buffers have negligible impact compared to the benefit of
225: a single allocation size, so the default value of zero results in never
226: copying packets. When copying is done, the cost is usually mitigated by using
227: a combined copy/checksum routine. Copying also preloads the cache, which is
228: most useful with small frames.
229:
230: A subtle aspect of the operation is that unaligned buffers are not permitted
231: by the hardware. Thus the IP header at offset 14 in an ethernet frame isn't
232: longword aligned for further processing. On copies frames are put into the
233: skbuff at an offset of "+2", 16-byte aligning the IP header.
234:
235: IIId. Synchronization
236:
237: The driver runs as two independent, single-threaded flows of control. One
238: is the send-packet routine, which enforces single-threaded use by the
239: dev->tbusy flag. The other thread is the interrupt handler, which is single
240: threaded by the hardware and interrupt handling software.
241:
242: The send packet thread has partial control over the Tx ring and 'dev->tbusy'
243: flag. It sets the tbusy flag whenever it's queuing a Tx packet. If the next
244: queue slot is empty, it clears the tbusy flag when finished otherwise it sets
245: the 'lp->tx_full' flag.
246:
247: The interrupt handler has exclusive control over the Rx ring and records stats
248: from the Tx ring. After reaping the stats, it marks the Tx queue entry as
249: empty by incrementing the dirty_tx mark. Iff the 'lp->tx_full' flag is set, it
250: clears both the tx_full and tbusy flags.
251:
252: IV. Notes
253:
254: The older dp83810 chips are so uncommon that support is not relevant.
255: No NatSemi datasheet was publically available at the initial release date,
256: but the dp83815 has now been published.
257:
258: IVb. References
259:
260: http://www.scyld.com/expert/100mbps.html
261: http://www.scyld.com/expert/NWay.html
262:
263:
264: IVc. Errata
265:
266: Qustionable multicast filter implementation.
267: The EEPROM format is obviously the result of a chip bug.
268: */
269:
270:
271:
272: static void *natsemi_probe1(struct pci_dev *pdev, void *init_dev,
273: long ioaddr, int irq, int chip_idx, int find_cnt);
274: static int power_event(void *dev_instance, int event);
275: #ifdef USE_IO_OPS
276: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_IO | PCI_ADDR0)
277: #else
278: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_MEM | PCI_ADDR1)
279: #endif
280:
281: static struct pci_id_info pci_id_tbl[] = {
282: {"Netgear FA311 (NatSemi DP83815)",
283: { 0x0020100B, 0xffffffff, 0xf3111385, 0xffffffff, },
284: PCI_IOTYPE, 256, 0},
285: {"NatSemi DP83815", { 0x0020100B, 0xffffffff },
286: PCI_IOTYPE, 256, 0},
287: {0,}, /* 0 terminated list. */
288: };
289:
290: struct drv_id_info natsemi_drv_id = {
291: "natsemi", PCI_HOTSWAP, PCI_CLASS_NETWORK_ETHERNET<<8, pci_id_tbl,
292: natsemi_probe1, power_event };
293:
294: /* Offsets to the device registers.
295: Unlike software-only systems, device drivers interact with complex hardware.
296: It's not useful to define symbolic names for every register bit in the
297: device. Please do not change these names without good reason.
298: */
299: enum register_offsets {
300: ChipCmd=0x00, ChipConfig=0x04, EECtrl=0x08, PCIBusCfg=0x0C,
301: IntrStatus=0x10, IntrMask=0x14, IntrEnable=0x18,
302: TxRingPtr=0x20, TxConfig=0x24,
303: RxRingPtr=0x30, RxConfig=0x34, ClkRunCtrl=0x3C,
304: WOLCmd=0x40, PauseCmd=0x44, RxFilterAddr=0x48, RxFilterData=0x4C,
305: BootRomAddr=0x50, BootRomData=0x54, ChipRevReg=0x58,
306: StatsCtrl=0x5C, StatsData=0x60,
307: RxPktErrs=0x60, RxMissed=0x68, RxCRCErrs=0x64,
308: NS_Xcvr_Mgmt = 0x80, NS_MII_BMCR=0x80, NS_MII_BMSR=0x84,
309: NS_MII_Advert=0x90, NS_MIILinkPartner=0x94,
310: };
311:
312: /* Bits in ChipCmd. */
313: enum ChipCmdBits {
314: ChipReset=0x100, SoftIntr=0x80, RxReset=0x20, TxReset=0x10,
315: RxOff=0x08, RxOn=0x04, TxOff=0x02, TxOn=0x01,
316: };
317:
318: /* Bits in ChipConfig. */
319: enum ChipConfigBits {
320: CfgLinkGood=0x80000000, CfgFDX=0x20000000,
321: };
322:
323: /* Bits in the interrupt status/mask registers. */
324: enum intr_status_bits {
325: IntrRxDone=0x0001, IntrRxIntr=0x0002, IntrRxErr=0x0004, IntrRxEarly=0x0008,
326: IntrRxIdle=0x0010, IntrRxOverrun=0x0020,
327: IntrTxDone=0x0040, IntrTxIntr=0x0080, IntrTxErr=0x0100,
328: IntrTxIdle=0x0200, IntrTxUnderrun=0x0400,
329: StatsMax=0x0800, IntrDrv=0x1000, WOLPkt=0x2000, LinkChange=0x4000,
330: RxStatusOverrun=0x10000,
331: RxResetDone=0x1000000, TxResetDone=0x2000000,
332: IntrPCIErr=0x00f00000,
333: IntrNormalSummary=0x0251, IntrAbnormalSummary=0xED20,
334: };
335:
336: /* Bits in the RxMode register. */
337: enum rx_mode_bits {
338: AcceptErr=0x20, AcceptRunt=0x10,
339: AcceptBroadcast=0xC0000000,
340: AcceptMulticast=0x00200000, AcceptAllMulticast=0x20000000,
341: AcceptAllPhys=0x10000000, AcceptMyPhys=0x08000000,
342: };
343:
344: /* The Rx and Tx buffer descriptors. */
345: /* Note that using only 32 bit fields simplifies conversion to big-endian
346: architectures. */
347: struct netdev_desc {
348: u32 next_desc;
349: s32 cmd_status;
350: u32 buf_addr;
351: u32 software_use;
352: };
353:
354: /* Bits in network_desc.status */
355: enum desc_status_bits {
356: DescOwn=0x80000000, DescMore=0x40000000, DescIntr=0x20000000,
357: DescNoCRC=0x10000000,
358: DescPktOK=0x08000000, RxTooLong=0x00400000,
359: };
360:
361: #define PRIV_ALIGN 15 /* Required alignment mask */
362: struct netdev_private {
363: /* Descriptor rings first for alignment. */
364: struct netdev_desc rx_ring[RX_RING_SIZE];
365: struct netdev_desc tx_ring[TX_RING_SIZE];
366: struct net_device *next_module; /* Link for devices of this type. */
367: void *priv_addr; /* Unaligned address for kfree */
368: const char *product_name;
369: /* The addresses of receive-in-place skbuffs. */
370: struct sk_buff* rx_skbuff[RX_RING_SIZE];
371: /* The saved address of a sent-in-place packet/buffer, for later free(). */
372: struct sk_buff* tx_skbuff[TX_RING_SIZE];
373: struct net_device_stats stats;
374: struct timer_list timer; /* Media monitoring timer. */
375: /* Frequently used values: keep some adjacent for cache effect. */
376: int msg_level;
377: int chip_id, drv_flags;
378: struct pci_dev *pci_dev;
379: long in_interrupt; /* Word-long for SMP locks. */
380: int max_interrupt_work;
381: int intr_enable;
382: unsigned int restore_intr_enable:1; /* Set if temporarily masked. */
383: unsigned int rx_q_empty:1; /* Set out-of-skbuffs. */
384:
385: struct netdev_desc *rx_head_desc;
386: unsigned int cur_rx, dirty_rx; /* Producer/consumer ring indices */
387: unsigned int rx_buf_sz; /* Based on MTU+slack. */
388: int rx_copybreak;
389:
390: unsigned int cur_tx, dirty_tx;
391: unsigned int tx_full:1; /* The Tx queue is full. */
392: /* These values keep track of the transceiver/media in use. */
393: unsigned int full_duplex:1; /* Full-duplex operation requested. */
394: unsigned int duplex_lock:1;
395: unsigned int medialock:1; /* Do not sense media. */
396: unsigned int default_port; /* Last dev->if_port value. */
397: /* Rx filter. */
398: u32 cur_rx_mode;
399: u16 rx_filter[32];
400: int multicast_filter_limit;
401: /* FIFO and PCI burst thresholds. */
402: int tx_config, rx_config;
403: /* MII transceiver section. */
404: u16 advertising; /* NWay media advertisement */
405: };
406:
407: static int eeprom_read(long ioaddr, int location);
408: static int mdio_read(struct net_device *dev, int phy_id, int location);
409: static void mdio_write(struct net_device *dev, int phy_id, int location,
410: int value);
411: static int netdev_open(struct net_device *dev);
412: static void check_duplex(struct net_device *dev);
413: static void netdev_timer(unsigned long data);
414: static void tx_timeout(struct net_device *dev);
415: static int rx_ring_fill(struct net_device *dev);
416: static void init_ring(struct net_device *dev);
417: static int start_tx(struct sk_buff *skb, struct net_device *dev);
418: static void intr_handler(int irq, void *dev_instance, struct pt_regs *regs);
419: static void netdev_error(struct net_device *dev, int intr_status);
420: static int netdev_rx(struct net_device *dev);
421: static void netdev_error(struct net_device *dev, int intr_status);
422: static void set_rx_mode(struct net_device *dev);
423: static struct net_device_stats *get_stats(struct net_device *dev);
424: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
425: static int netdev_close(struct net_device *dev);
426:
427:
428:
429: /* A list of our installed devices, for removing the driver module. */
430: static struct net_device *root_net_dev = NULL;
431:
432: #ifndef MODULE
433: int natsemi_probe(struct net_device *dev)
434: {
435: if (pci_drv_register(&natsemi_drv_id, dev) < 0)
436: return -ENODEV;
437: printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
438: return 0;
439: }
440: #endif
441:
442: static void *natsemi_probe1(struct pci_dev *pdev, void *init_dev,
443: long ioaddr, int irq, int chip_idx, int card_idx)
444: {
445: struct net_device *dev;
446: struct netdev_private *np;
447: void *priv_mem;
448: int i, option = card_idx < MAX_UNITS ? options[card_idx] : 0;
449: int prev_eedata;
450:
451: dev = init_etherdev(init_dev, 0);
452: if (!dev)
453: return NULL;
454:
455: /* Perhaps NETIF_MSG_PROBE */
456: printk(KERN_INFO "%s: %s at 0x%lx, ",
457: dev->name, pci_id_tbl[chip_idx].name, ioaddr);
458:
459: /* Work around the dropped serial bit. */
460: prev_eedata = eeprom_read(ioaddr, 6);
461: for (i = 0; i < 3; i++) {
462: int eedata = eeprom_read(ioaddr, i + 7);
463: dev->dev_addr[i*2] = (eedata << 1) + (prev_eedata >> 15);
464: dev->dev_addr[i*2+1] = eedata >> 7;
465: prev_eedata = eedata;
466: }
467: for (i = 0; i < 5; i++)
468: printk("%2.2x:", dev->dev_addr[i]);
469: printk("%2.2x, IRQ %d.\n", dev->dev_addr[i], irq);
470:
471: /* Reset the chip to erase previous misconfiguration. */
472: writel(ChipReset, ioaddr + ChipCmd);
473:
474: /* Make certain elements e.g. descriptor lists are aligned. */
475: priv_mem = kmalloc(sizeof(*np) + PRIV_ALIGN, GFP_KERNEL);
476: /* Check for the very unlikely case of no memory. */
477: if (priv_mem == NULL)
478: return NULL;
479:
480: dev->base_addr = ioaddr;
481: dev->irq = irq;
482:
483: dev->priv = np = (void *)(((long)priv_mem + PRIV_ALIGN) & ~PRIV_ALIGN);
484: memset(np, 0, sizeof(*np));
485: np->priv_addr = priv_mem;
486:
487: np->next_module = root_net_dev;
488: root_net_dev = dev;
489:
490: np->pci_dev = pdev;
491: np->chip_id = chip_idx;
492: np->drv_flags = pci_id_tbl[chip_idx].drv_flags;
493: np->msg_level = (1 << debug) - 1;
494: np->rx_copybreak = rx_copybreak;
495: np->max_interrupt_work = max_interrupt_work;
496: np->multicast_filter_limit = multicast_filter_limit;
497:
498: if (dev->mem_start)
499: option = dev->mem_start;
500:
501: /* 0x10/0x20/0x100/0x200 set forced speed&duplex modes. */
502: if (option > 0) {
503: if (option & 0x220)
504: np->full_duplex = 1;
505: np->default_port = option & 0x3ff;
506: if (np->default_port & 0x330) {
507: np->medialock = 1;
508: if (np->msg_level & NETIF_MSG_PROBE)
509: printk(KERN_INFO " Forcing %dMbs %s-duplex operation.\n",
510: (option & 0x300 ? 100 : 10),
511: (np->full_duplex ? "full" : "half"));
512: writew(((option & 0x300) ? 0x2000 : 0) | /* 100mbps? */
513: (np->full_duplex ? 0x0100 : 0), /* Full duplex? */
514: ioaddr + NS_MII_BMCR);
515: }
516: }
517: if (card_idx < MAX_UNITS && full_duplex[card_idx] > 0)
518: np->full_duplex = 1;
519:
520: if (np->full_duplex) {
521: if (np->msg_level & NETIF_MSG_PROBE)
522: printk(KERN_INFO "%s: Set to forced full duplex, autonegotiation"
523: " disabled.\n", dev->name);
524: np->duplex_lock = 1;
525: }
526:
527: /* The chip-specific entries in the device structure. */
528: dev->open = &netdev_open;
529: dev->hard_start_xmit = &start_tx;
530: dev->stop = &netdev_close;
531: dev->get_stats = &get_stats;
532: dev->set_multicast_list = &set_rx_mode;
533: dev->do_ioctl = &mii_ioctl;
534:
535: /* Override the PME enable from the EEPROM. */
536: writel(0x8000, ioaddr + ClkRunCtrl);
537:
538: if ((readl(ioaddr + ChipConfig) & 0xe000) != 0xe000) {
539: u32 chip_config = readl(ioaddr + ChipConfig);
540: if (np->msg_level & NETIF_MSG_PROBE)
541: printk(KERN_INFO "%s: Transceiver default autonegotiation %s "
542: "10%s %s duplex.\n",
543: dev->name, chip_config & 0x2000 ? "enabled, advertise"
544: : "disabled, force", chip_config & 0x4000 ? "0" : "",
545: chip_config & 0x8000 ? "full" : "half");
546: }
547: if (np->msg_level & NETIF_MSG_PROBE)
548: printk(KERN_INFO "%s: Transceiver status 0x%4.4x partner %4.4x.\n",
549: dev->name, (int)readl(ioaddr + NS_MII_BMSR),
550: (int)readl(ioaddr + NS_MIILinkPartner));
551:
552: return dev;
553: }
554:
555:
556: /* Read the EEPROM and MII Management Data I/O (MDIO) interfaces.
557: The EEPROM code is for the common 93c06/46 EEPROMs with 6 bit addresses.
558: Update to the code in other drivers for 8/10 bit addresses.
559: */
560:
561: /* Delay between EEPROM clock transitions.
562: This "delay" forces out buffered PCI writes, which is sufficient to meet
563: the timing requirements of most EEPROMs.
564: */
565: #define eeprom_delay(ee_addr) readl(ee_addr)
566:
567: enum EEPROM_Ctrl_Bits {
568: EE_ShiftClk=0x04, EE_DataIn=0x01, EE_ChipSelect=0x08, EE_DataOut=0x02,
569: };
570: #define EE_Write0 (EE_ChipSelect)
571: #define EE_Write1 (EE_ChipSelect | EE_DataIn)
572:
573: /* The EEPROM commands include the preamble. */
574: enum EEPROM_Cmds {
575: EE_WriteCmd=(5 << 6), EE_ReadCmd=(6 << 6), EE_EraseCmd=(7 << 6),
576: };
577:
578: static int eeprom_read(long addr, int location)
579: {
580: int i;
581: int retval = 0;
582: long ee_addr = addr + EECtrl;
583: int read_cmd = location | EE_ReadCmd;
584: writel(EE_Write0, ee_addr);
585:
586: /* Shift the read command bits out. */
587: for (i = 10; i >= 0; i--) {
588: short dataval = (read_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
589: writel(dataval, ee_addr);
590: eeprom_delay(ee_addr);
591: writel(dataval | EE_ShiftClk, ee_addr);
592: eeprom_delay(ee_addr);
593: }
594: writel(EE_ChipSelect, ee_addr);
595: eeprom_delay(ee_addr);
596:
597: for (i = 0; i < 16; i++) {
598: writel(EE_ChipSelect | EE_ShiftClk, ee_addr);
599: eeprom_delay(ee_addr);
600: retval |= (readl(ee_addr) & EE_DataOut) ? 1 << i : 0;
601: writel(EE_ChipSelect, ee_addr);
602: eeprom_delay(ee_addr);
603: }
604:
605: /* Terminate the EEPROM access. */
606: writel(EE_Write0, ee_addr);
607: writel(0, ee_addr);
608: return retval;
609: }
610:
611: /* MII transceiver control section.
612: The 83815 series has an internal, directly accessable transceiver.
613: We present the management registers as if they were MII connected. */
614:
615: static int mdio_read(struct net_device *dev, int phy_id, int location)
616: {
617: if (phy_id == 1 && location < 32)
618: return readw(dev->base_addr + NS_Xcvr_Mgmt + (location<<2));
619: else
620: return 0xffff;
621: }
622:
623: static void mdio_write(struct net_device *dev, int phy_id, int location,
624: int value)
625: {
626: if (phy_id == 1 && location < 32)
627: writew(value, dev->base_addr + NS_Xcvr_Mgmt + (location<<2));
628: }
629:
630:
631: static int netdev_open(struct net_device *dev)
632: {
633: struct netdev_private *np = (struct netdev_private *)dev->priv;
634: long ioaddr = dev->base_addr;
635: int i;
636:
637: /* We do not need to reset the '815 chip. */
638:
639: MOD_INC_USE_COUNT;
640:
641: if (request_irq(dev->irq, &intr_handler, SA_SHIRQ, dev->name, dev)) {
642: MOD_DEC_USE_COUNT;
643: return -EAGAIN;
644: }
645:
646: if (np->msg_level & NETIF_MSG_IFUP)
647: printk(KERN_DEBUG "%s: netdev_open() irq %d.\n",
648: dev->name, dev->irq);
649:
650: init_ring(dev);
651:
652: writel(virt_to_bus(np->rx_ring), ioaddr + RxRingPtr);
653: writel(virt_to_bus(np->tx_ring), ioaddr + TxRingPtr);
654:
655: for (i = 0; i < 6; i += 2) {
656: writel(i, ioaddr + RxFilterAddr);
657: writel(dev->dev_addr[i] + (dev->dev_addr[i+1] << 8),
658: ioaddr + RxFilterData);
659: }
660:
661: /* Initialize other registers. */
662: /* See the datasheet for this correction. */
663: if (readl(ioaddr + ChipRevReg) == 0x0203) {
664: writew(0x0001, ioaddr + 0xCC);
665: writew(0x18C9, ioaddr + 0xE4);
666: writew(0x0000, ioaddr + 0xFC);
667: writew(0x5040, ioaddr + 0xF4);
668: writew(0x008C, ioaddr + 0xF8);
669: }
670:
671: /* Configure the PCI bus bursts and FIFO thresholds. */
672: /* Configure for standard, in-spec Ethernet. */
673:
674: if (readl(ioaddr + ChipConfig) & CfgFDX) { /* Full duplex */
675: np->tx_config = 0xD0801002;
676: np->rx_config = 0x10000020;
677: } else {
678: np->tx_config = 0x10801002;
679: np->rx_config = 0x0020;
680: }
681: if (dev->mtu > 1500)
682: np->rx_config |= 0x08000000;
683: writel(np->tx_config, ioaddr + TxConfig);
684: writel(np->rx_config, ioaddr + RxConfig);
685:
686: if (dev->if_port == 0)
687: dev->if_port = np->default_port;
688:
689: np->in_interrupt = 0;
690:
691: check_duplex(dev);
692: set_rx_mode(dev);
693: netif_start_tx_queue(dev);
694:
695: /* Enable interrupts by setting the interrupt mask. */
696: np->intr_enable = IntrNormalSummary | IntrAbnormalSummary | 0x1f;
697: writel(np->intr_enable, ioaddr + IntrMask);
698: writel(1, ioaddr + IntrEnable);
699:
700: writel(RxOn | TxOn, ioaddr + ChipCmd);
701: writel(4, ioaddr + StatsCtrl); /* Clear Stats */
702:
703: if (np->msg_level & NETIF_MSG_IFUP)
704: printk(KERN_DEBUG "%s: Done netdev_open(), status: %x.\n",
705: dev->name, (int)readl(ioaddr + ChipCmd));
706:
707: /* Set the timer to check for link beat. */
708: init_timer(&np->timer);
709: np->timer.expires = jiffies + 3*HZ;
710: np->timer.data = (unsigned long)dev;
711: np->timer.function = &netdev_timer; /* timer handler */
712: add_timer(&np->timer);
713:
714: return 0;
715: }
716:
717: static void check_duplex(struct net_device *dev)
718: {
719: struct netdev_private *np = (struct netdev_private *)dev->priv;
720: long ioaddr = dev->base_addr;
721: int duplex;
722:
723: if (np->duplex_lock)
724: return;
725: duplex = readl(ioaddr + ChipConfig) & 0x20000000 ? 1 : 0;
726: if (np->full_duplex != duplex) {
727: np->full_duplex = duplex;
728: if (np->msg_level & NETIF_MSG_LINK)
729: printk(KERN_INFO "%s: Setting %s-duplex based on negotiated link"
730: " capability.\n", dev->name,
731: duplex ? "full" : "half");
732: if (duplex) {
733: np->rx_config |= 0x10000000;
734: np->tx_config |= 0xC0000000;
735: } else {
736: np->rx_config &= ~0x10000000;
737: np->tx_config &= ~0xC0000000;
738: }
739: writel(np->tx_config, ioaddr + TxConfig);
740: writel(np->rx_config, ioaddr + RxConfig);
741: }
742: }
743:
744: static void netdev_timer(unsigned long data)
745: {
746: struct net_device *dev = (struct net_device *)data;
747: struct netdev_private *np = (struct netdev_private *)dev->priv;
748: long ioaddr = dev->base_addr;
749: int next_tick = 10*HZ;
750:
751: if (np->msg_level & NETIF_MSG_TIMER)
752: printk(KERN_DEBUG "%s: Driver monitor timer tick, status %8.8x.\n",
753: dev->name, (int)readl(ioaddr + IntrStatus));
754: if (np->rx_q_empty) {
755: /* Trigger an interrupt to refill. */
756: writel(SoftIntr, ioaddr + ChipCmd);
757: }
758: /* This will either have a small false-trigger window or will not catch
759: tbusy incorrectly set when the queue is empty. */
760: if (netif_queue_paused(dev) &&
761: np->cur_tx - np->dirty_tx > 1 &&
762: (jiffies - dev->trans_start) > TX_TIMEOUT) {
763: tx_timeout(dev);
764: }
765: check_duplex(dev);
766: np->timer.expires = jiffies + next_tick;
767: add_timer(&np->timer);
768: }
769:
770: static void tx_timeout(struct net_device *dev)
771: {
772: struct netdev_private *np = (struct netdev_private *)dev->priv;
773: long ioaddr = dev->base_addr;
774:
775: printk(KERN_WARNING "%s: Transmit timed out, status %8.8x,"
776: " resetting...\n", dev->name, (int)readl(ioaddr + TxRingPtr));
777:
778: if (np->msg_level & NETIF_MSG_TX_ERR) {
779: int i;
780: printk(KERN_DEBUG " Rx ring %p: ", np->rx_ring);
781: for (i = 0; i < RX_RING_SIZE; i++)
782: printk(" %8.8x", (unsigned int)np->rx_ring[i].cmd_status);
783: printk("\n"KERN_DEBUG" Tx ring %p: ", np->tx_ring);
784: for (i = 0; i < TX_RING_SIZE; i++)
785: printk(" %4.4x", np->tx_ring[i].cmd_status);
786: printk("\n");
787: }
788:
789: /* Reinitialize the hardware here. */
790: /* Stop and restart the chip's Tx processes . */
791:
792: /* Trigger an immediate transmit demand. */
793:
794: dev->trans_start = jiffies;
795: np->stats.tx_errors++;
796: return;
797: }
798:
799: /* Refill the Rx ring buffers, returning non-zero if not full. */
800: static int rx_ring_fill(struct net_device *dev)
801: {
802: struct netdev_private *np = (struct netdev_private *)dev->priv;
803: unsigned int entry;
804:
805: for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
806: entry = np->dirty_rx % RX_RING_SIZE;
807: if (np->rx_skbuff[entry] == NULL) {
808: struct sk_buff *skb = dev_alloc_skb(np->rx_buf_sz);
809: np->rx_skbuff[entry] = skb;
810: if (skb == NULL)
811: return 1; /* Better luck next time. */
812: skb->dev = dev; /* Mark as being used by this device. */
813: np->rx_ring[entry].buf_addr = virt_to_le32desc(skb->tail);
814: }
815: np->rx_ring[entry].cmd_status = cpu_to_le32(DescIntr | np->rx_buf_sz);
816: }
817: return 0;
818: }
819:
820: /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
821: static void init_ring(struct net_device *dev)
822: {
823: struct netdev_private *np = (struct netdev_private *)dev->priv;
824: int i;
825:
826: np->tx_full = 0;
827: np->cur_rx = np->cur_tx = 0;
828: np->dirty_rx = np->dirty_tx = 0;
829:
830: /* MAX(PKT_BUF_SZ, dev->mtu + 8); */
831: /* I know you _want_ to change this without understanding it. Don't. */
832: np->rx_buf_sz = (dev->mtu <= 1532 ? PKT_BUF_SZ : dev->mtu + 8);
833: np->rx_head_desc = &np->rx_ring[0];
834:
835: /* Initialize all Rx descriptors. */
836: for (i = 0; i < RX_RING_SIZE; i++) {
837: np->rx_ring[i].next_desc = virt_to_le32desc(&np->rx_ring[i+1]);
838: np->rx_ring[i].cmd_status = cpu_to_le32(DescOwn);
839: np->rx_skbuff[i] = 0;
840: }
841: /* Mark the last entry as wrapping the ring. */
842: np->rx_ring[i-1].next_desc = virt_to_le32desc(&np->rx_ring[0]);
843:
844: for (i = 0; i < TX_RING_SIZE; i++) {
845: np->tx_skbuff[i] = 0;
846: np->tx_ring[i].next_desc = virt_to_le32desc(&np->tx_ring[i+1]);
847: np->tx_ring[i].cmd_status = 0;
848: }
849: np->tx_ring[i-1].next_desc = virt_to_le32desc(&np->tx_ring[0]);
850:
851: /* Fill in the Rx buffers.
852: Allocation failure just leaves a "negative" np->dirty_rx. */
853: np->dirty_rx = (unsigned int)(0 - RX_RING_SIZE);
854: rx_ring_fill(dev);
855:
856: return;
857: }
858:
859: static int start_tx(struct sk_buff *skb, struct net_device *dev)
860: {
861: struct netdev_private *np = (struct netdev_private *)dev->priv;
862: unsigned int entry;
863:
864: /* Block a timer-based transmit from overlapping. This happens when
865: packets are presumed lost, and we use this check the Tx status. */
866: if (netif_pause_tx_queue(dev) != 0) {
867: /* This watchdog code is redundant with the media monitor timer. */
868: if (jiffies - dev->trans_start > TX_TIMEOUT)
869: tx_timeout(dev);
870: return 1;
871: }
872:
873: /* Note: Ordering is important here, set the field with the
874: "ownership" bit last, and only then increment cur_tx.
875: No spinlock is needed for either Tx or Rx.
876: */
877:
878: /* Calculate the next Tx descriptor entry. */
879: entry = np->cur_tx % TX_RING_SIZE;
880:
881: np->tx_skbuff[entry] = skb;
882:
883: np->tx_ring[entry].buf_addr = virt_to_le32desc(skb->data);
884: np->tx_ring[entry].cmd_status = cpu_to_le32(DescOwn|DescIntr | skb->len);
885: np->cur_tx++;
886:
887: /* For some architectures explicitly flushing np->tx_ring,sizeof(tx_ring)
888: and skb->data,skb->len improves performance. */
889:
890: if (np->cur_tx - np->dirty_tx >= TX_QUEUE_LEN - 1) {
891: np->tx_full = 1;
892: /* Check for a just-cleared queue. */
893: if (np->cur_tx - (volatile unsigned int)np->dirty_tx
894: < TX_QUEUE_LEN - 4) {
895: np->tx_full = 0;
896: netif_unpause_tx_queue(dev);
897: } else
898: netif_stop_tx_queue(dev);
899: } else
900: netif_unpause_tx_queue(dev); /* Typical path */
901: /* Wake the potentially-idle transmit channel. */
902: writel(TxOn, dev->base_addr + ChipCmd);
903:
904: dev->trans_start = jiffies;
905:
906: if (np->msg_level & NETIF_MSG_TX_QUEUED) {
907: printk(KERN_DEBUG "%s: Transmit frame #%d queued in slot %d.\n",
908: dev->name, np->cur_tx, entry);
909: }
910: return 0;
911: }
912:
913: /* The interrupt handler does all of the Rx thread work and cleans up
914: after the Tx thread. */
915: static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs)
916: {
917: struct net_device *dev = (struct net_device *)dev_instance;
918: struct netdev_private *np;
919: long ioaddr;
920: int boguscnt;
921:
922: #ifndef final_version /* Can never occur. */
923: if (dev == NULL) {
924: printk (KERN_ERR "Netdev interrupt handler(): IRQ %d for unknown "
925: "device.\n", irq);
926: return;
927: }
928: #endif
929:
930: ioaddr = dev->base_addr;
931: np = (struct netdev_private *)dev->priv;
932: boguscnt = np->max_interrupt_work;
933:
934: do {
935: u32 intr_status = readl(ioaddr + IntrStatus);
936:
937: if (intr_status == 0 || intr_status == 0xffffffff)
938: break;
939:
940: /* Acknowledge all of the current interrupt sources ASAP.
941: Nominally the read above accomplishes this, but... */
942: writel(intr_status & 0x001ffff, ioaddr + IntrStatus);
943:
944: if (np->msg_level & NETIF_MSG_INTR)
945: printk(KERN_DEBUG "%s: Interrupt, status %8.8x.\n",
946: dev->name, intr_status);
947:
948: if (intr_status & (IntrRxDone | IntrRxIntr)) {
949: netdev_rx(dev);
950: np->rx_q_empty = rx_ring_fill(dev);
951: }
952:
953: if (intr_status & (IntrRxIdle | IntrDrv)) {
954: unsigned int old_dirty_rx = np->dirty_rx;
955: if (rx_ring_fill(dev) == 0)
956: np->rx_q_empty = 0;
957: /* Restart Rx engine iff we did add a buffer. */
958: if (np->dirty_rx != old_dirty_rx)
959: writel(RxOn, dev->base_addr + ChipCmd);
960: }
961:
962: for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) {
963: int entry = np->dirty_tx % TX_RING_SIZE;
964: int tx_status = le32_to_cpu(np->tx_ring[entry].cmd_status);
965: if (tx_status & DescOwn)
966: break;
967: if (np->msg_level & NETIF_MSG_TX_DONE)
968: printk(KERN_DEBUG "%s: Transmit done, Tx status %8.8x.\n",
969: dev->name, tx_status);
970: if (tx_status & 0x08000000) {
971: np->stats.tx_packets++;
972: #if LINUX_VERSION_CODE > 0x20127
973: np->stats.tx_bytes += np->tx_skbuff[entry]->len;
974: #endif
975: } else { /* Various Tx errors */
976: if (np->msg_level & NETIF_MSG_TX_ERR)
977: printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
978: dev->name, tx_status);
979: if (tx_status & 0x04010000) np->stats.tx_aborted_errors++;
980: if (tx_status & 0x02000000) np->stats.tx_fifo_errors++;
981: if (tx_status & 0x01000000) np->stats.tx_carrier_errors++;
982: if (tx_status & 0x00200000) np->stats.tx_window_errors++;
983: np->stats.tx_errors++;
984: }
985: /* Free the original skb. */
986: dev_free_skb_irq(np->tx_skbuff[entry]);
987: np->tx_skbuff[entry] = 0;
988: }
989: /* Note the 4 slot hysteresis to mark the queue non-full. */
990: if (np->tx_full
991: && np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4) {
992: /* The ring is no longer full, allow new TX entries. */
993: np->tx_full = 0;
994: netif_resume_tx_queue(dev);
995: }
996:
997: /* Abnormal error summary/uncommon events handlers. */
998: if (intr_status & IntrAbnormalSummary)
999: netdev_error(dev, intr_status);
1000:
1001: if (--boguscnt < 0) {
1002: printk(KERN_WARNING "%s: Too much work at interrupt, "
1003: "status=0x%4.4x.\n",
1004: dev->name, intr_status);
1005: np->restore_intr_enable = 1;
1006: break;
1007: }
1008: } while (1);
1009:
1010: if (np->msg_level & NETIF_MSG_INTR)
1011: printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n",
1012: dev->name, (int)readl(ioaddr + IntrStatus));
1013:
1014: return;
1015: }
1016:
1017: /* This routine is logically part of the interrupt handler, but separated
1018: for clarity and better register allocation. */
1019: static int netdev_rx(struct net_device *dev)
1020: {
1021: struct netdev_private *np = (struct netdev_private *)dev->priv;
1022: int entry = np->cur_rx % RX_RING_SIZE;
1023: int boguscnt = np->dirty_rx + RX_RING_SIZE - np->cur_rx;
1024: s32 desc_status = le32_to_cpu(np->rx_head_desc->cmd_status);
1025:
1026: /* If the driver owns the next entry it's a new packet. Send it up. */
1027: while (desc_status < 0) { /* e.g. & DescOwn */
1028: if (np->msg_level & NETIF_MSG_RX_STATUS)
1029: printk(KERN_DEBUG " In netdev_rx() entry %d status was %8.8x.\n",
1030: entry, desc_status);
1031: if (--boguscnt < 0)
1032: break;
1033: if ((desc_status & (DescMore|DescPktOK|RxTooLong)) != DescPktOK) {
1034: if (desc_status & DescMore) {
1035: printk(KERN_WARNING "%s: Oversized(?) Ethernet frame spanned "
1036: "multiple buffers, entry %#x status %x.\n",
1037: dev->name, np->cur_rx, desc_status);
1038: np->stats.rx_length_errors++;
1039: } else {
1040: /* There was a error. */
1041: if (np->msg_level & NETIF_MSG_RX_ERR)
1042: printk(KERN_DEBUG " netdev_rx() Rx error was %8.8x.\n",
1043: desc_status);
1044: np->stats.rx_errors++;
1045: if (desc_status & 0x06000000) np->stats.rx_over_errors++;
1046: if (desc_status & 0x00600000) np->stats.rx_length_errors++;
1047: if (desc_status & 0x00140000) np->stats.rx_frame_errors++;
1048: if (desc_status & 0x00080000) np->stats.rx_crc_errors++;
1049: }
1050: } else {
1051: struct sk_buff *skb;
1052: int pkt_len = (desc_status & 0x0fff) - 4; /* Omit CRC size. */
1053: /* Check if the packet is long enough to accept without copying
1054: to a minimally-sized skbuff. */
1055: if (pkt_len < np->rx_copybreak
1056: && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
1057: skb->dev = dev;
1058: skb_reserve(skb, 2); /* 16 byte align the IP header */
1059: #if defined(HAS_IP_COPYSUM) || (LINUX_VERSION_CODE >= 0x20100)
1060: eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
1061: skb_put(skb, pkt_len);
1062: #else
1063: memcpy(skb_put(skb, pkt_len), np->rx_skbuff[entry]->tail,
1064: pkt_len);
1065: #endif
1066: } else {
1067: skb_put(skb = np->rx_skbuff[entry], pkt_len);
1068: np->rx_skbuff[entry] = NULL;
1069: }
1070: skb->protocol = eth_type_trans(skb, dev);
1071: /* W/ hardware checksum: skb->ip_summed = CHECKSUM_UNNECESSARY; */
1072: netif_rx(skb);
1073: dev->last_rx = jiffies;
1074: np->stats.rx_packets++;
1075: #if LINUX_VERSION_CODE > 0x20127
1076: np->stats.rx_bytes += pkt_len;
1077: #endif
1078: }
1079: entry = (++np->cur_rx) % RX_RING_SIZE;
1080: np->rx_head_desc = &np->rx_ring[entry];
1081: desc_status = le32_to_cpu(np->rx_head_desc->cmd_status);
1082: }
1083:
1084: /* Refill is now done in the main interrupt loop. */
1085: return 0;
1086: }
1087:
1088: static void netdev_error(struct net_device *dev, int intr_status)
1089: {
1090: struct netdev_private *np = (struct netdev_private *)dev->priv;
1091: long ioaddr = dev->base_addr;
1092:
1093: if (intr_status & LinkChange) {
1094: int chip_config = readl(ioaddr + ChipConfig);
1095: if (np->msg_level & NETIF_MSG_LINK)
1096: printk(KERN_NOTICE "%s: Link changed: Autonegotiation advertising"
1097: " %4.4x partner %4.4x.\n", dev->name,
1098: (int)readw(ioaddr + NS_MII_Advert),
1099: (int)readw(ioaddr + NS_MIILinkPartner));
1100: if (chip_config & CfgLinkGood)
1101: netif_link_up(dev);
1102: else
1103: netif_link_down(dev);
1104: check_duplex(dev);
1105: }
1106: if (intr_status & StatsMax) {
1107: get_stats(dev);
1108: }
1109: if (intr_status & IntrTxUnderrun) {
1110: /* Increase the Tx threshold, 32 byte units. */
1111: if ((np->tx_config & 0x3f) < 62)
1112: np->tx_config += 2; /* +64 bytes */
1113: writel(np->tx_config, ioaddr + TxConfig);
1114: }
1115: if (intr_status & WOLPkt) {
1116: int wol_status = readl(ioaddr + WOLCmd);
1117: printk(KERN_NOTICE "%s: Link wake-up event %8.8x",
1118: dev->name, wol_status);
1119: }
1120: if (intr_status & (RxStatusOverrun | IntrRxOverrun)) {
1121: if (np->msg_level & NETIF_MSG_DRV)
1122: printk(KERN_ERR "%s: Rx overflow! ns815 %8.8x.\n",
1123: dev->name, intr_status);
1124: np->stats.rx_fifo_errors++;
1125: }
1126: if (intr_status & ~(LinkChange|StatsMax|RxResetDone|TxResetDone|
1127: RxStatusOverrun|0xA7ff)) {
1128: if (np->msg_level & NETIF_MSG_DRV)
1129: printk(KERN_ERR "%s: Something Wicked happened! natsemi %8.8x.\n",
1130: dev->name, intr_status);
1131: }
1132: /* Hmmmmm, it's not clear how to recover from PCI faults. */
1133: if (intr_status & IntrPCIErr) {
1134: np->stats.tx_fifo_errors++;
1135: np->stats.rx_fifo_errors++;
1136: }
1137: }
1138:
1139: static struct net_device_stats *get_stats(struct net_device *dev)
1140: {
1141: long ioaddr = dev->base_addr;
1142: struct netdev_private *np = (struct netdev_private *)dev->priv;
1143: int crc_errs = readl(ioaddr + RxCRCErrs);
1144:
1145: if (crc_errs != 0xffffffff) {
1146: /* We need not lock this segment of code for SMP.
1147: There is no atomic-add vulnerability for most CPUs,
1148: and statistics are non-critical. */
1149: /* The chip only need report frame silently dropped. */
1150: np->stats.rx_crc_errors += crc_errs;
1151: np->stats.rx_missed_errors += readl(ioaddr + RxMissed);
1152: }
1153:
1154: return &np->stats;
1155: }
1156:
1157: /* The big-endian AUTODIN II ethernet CRC calculations.
1158: See ns820.c for how to fill the table on new chips.
1159: */
1160: static unsigned const ethernet_polynomial = 0x04c11db7U;
1161: static inline u32 ether_crc(int length, unsigned char *data)
1162: {
1163: int crc = -1;
1164:
1165: while(--length >= 0) {
1166: unsigned char current_octet = *data++;
1167: int bit;
1168: for (bit = 0; bit < 8; bit++, current_octet >>= 1)
1169: crc = (crc << 1) ^
1170: ((crc < 0) ^ (current_octet & 1) ? ethernet_polynomial : 0);
1171: }
1172: return crc;
1173: }
1174:
1175: static void set_rx_mode(struct net_device *dev)
1176: {
1177: long ioaddr = dev->base_addr;
1178: struct netdev_private *np = (struct netdev_private *)dev->priv;
1179: u8 mc_filter[64]; /* Multicast hash filter */
1180: u32 rx_mode;
1181:
1182: if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */
1183: /* Unconditionally log net taps. */
1184: printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
1185: rx_mode = AcceptBroadcast | AcceptAllMulticast | AcceptAllPhys
1186: | AcceptMyPhys;
1187: } else if ((dev->mc_count > np->multicast_filter_limit)
1188: || (dev->flags & IFF_ALLMULTI)) {
1189: rx_mode = AcceptBroadcast | AcceptAllMulticast | AcceptMyPhys;
1190: } else {
1191: struct dev_mc_list *mclist;
1192: int i;
1193: memset(mc_filter, 0, sizeof(mc_filter));
1194: for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
1195: i++, mclist = mclist->next) {
1196: int filterbit = ether_crc(ETH_ALEN, mclist->dmi_addr);
1197: set_bit(filterbit & 0x1ff, mc_filter);
1198: if (np->msg_level & NETIF_MSG_RXFILTER)
1199: printk(KERN_INFO "%s: Added filter for %2.2x:%2.2x:%2.2x:"
1200: "%2.2x:%2.2x:%2.2x crc %8.8x bit %d.\n", dev->name,
1201: mclist->dmi_addr[0], mclist->dmi_addr[1],
1202: mclist->dmi_addr[2], mclist->dmi_addr[3],
1203: mclist->dmi_addr[4], mclist->dmi_addr[5],
1204: filterbit, filterbit & 0x1ff);
1205: }
1206: rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
1207: for (i = 0; i < 64; i += 2) {
1208: u16 filterword = (mc_filter[i+1]<<8) + mc_filter[i];
1209: if (filterword != np->rx_filter[i>>2]) {
1210: writel(0x200 + i, ioaddr + RxFilterAddr);
1211: writel(filterword, ioaddr + RxFilterData);
1212: np->rx_filter[i>>2] = filterword;
1213: }
1214: }
1215: }
1216: writel(rx_mode, ioaddr + RxFilterAddr);
1217: np->cur_rx_mode = rx_mode;
1218: }
1219:
1220: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1221: {
1222: struct netdev_private *np = (struct netdev_private *)dev->priv;
1223: u16 *data = (u16 *)&rq->ifr_data;
1224: u32 *data32 = (void *)&rq->ifr_data;
1225:
1226: switch(cmd) {
1227: case 0x8947: case 0x89F0:
1228: /* SIOCGMIIPHY: Get the address of the PHY in use. */
1229: data[0] = 1;
1230: /* Fall Through */
1231: case 0x8948: case 0x89F1:
1232: /* SIOCGMIIREG: Read the specified MII register. */
1233: data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
1234: return 0;
1235: case 0x8949: case 0x89F2:
1236: /* SIOCSMIIREG: Write the specified MII register */
1237: if (!capable(CAP_NET_ADMIN))
1238: return -EPERM;
1239: if (data[0] == 1) {
1240: u16 miireg = data[1] & 0x1f;
1241: u16 value = data[2];
1242: mdio_write(dev, 1, miireg, value);
1243: switch (miireg) {
1244: case 0:
1245: /* Check for autonegotiation on or reset. */
1246: np->duplex_lock = (value & 0x9000) ? 0 : 1;
1247: if (np->duplex_lock)
1248: np->full_duplex = (value & 0x0100) ? 1 : 0;
1249: break;
1250: case 4: np->advertising = value; break;
1251: }
1252: }
1253: return 0;
1254: case SIOCGPARAMS:
1255: data32[0] = np->msg_level;
1256: data32[1] = np->multicast_filter_limit;
1257: data32[2] = np->max_interrupt_work;
1258: data32[3] = np->rx_copybreak;
1259: return 0;
1260: case SIOCSPARAMS:
1261: if (!capable(CAP_NET_ADMIN))
1262: return -EPERM;
1263: np->msg_level = data32[0];
1264: np->multicast_filter_limit = data32[1];
1265: np->max_interrupt_work = data32[2];
1266: np->rx_copybreak = data32[3];
1267: return 0;
1268: default:
1269: return -EOPNOTSUPP;
1270: }
1271: }
1272:
1273: static int netdev_close(struct net_device *dev)
1274: {
1275: long ioaddr = dev->base_addr;
1276: struct netdev_private *np = (struct netdev_private *)dev->priv;
1277: int i;
1278:
1279: netif_stop_tx_queue(dev);
1280:
1281: if (np->msg_level & NETIF_MSG_IFDOWN) {
1282: printk(KERN_DEBUG "%s: Shutting down ethercard, status was %4.4x "
1283: "Int %2.2x.\n",
1284: dev->name, (int)readl(ioaddr + ChipCmd),
1285: (int)readl(ioaddr + IntrStatus));
1286: printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d, Rx %d / %d.\n",
1287: dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx);
1288: }
1289:
1290: /* We don't want the timer to re-start anything. */
1291: del_timer(&np->timer);
1292:
1293: /* Disable interrupts using the mask. */
1294: writel(0, ioaddr + IntrMask);
1295: writel(0, ioaddr + IntrEnable);
1296: writel(2, ioaddr + StatsCtrl); /* Freeze Stats */
1297:
1298: /* Stop the chip's Tx and Rx processes. */
1299: writel(RxOff | TxOff, ioaddr + ChipCmd);
1300:
1301: get_stats(dev);
1302:
1303: #ifdef __i386__
1304: if (np->msg_level & NETIF_MSG_IFDOWN) {
1305: printk("\n"KERN_DEBUG" Tx ring at %8.8x:\n",
1306: (int)virt_to_bus(np->tx_ring));
1307: for (i = 0; i < TX_RING_SIZE; i++)
1308: printk(" #%d desc. %8.8x %8.8x.\n",
1309: i, np->tx_ring[i].cmd_status, (u32)np->tx_ring[i].buf_addr);
1310: printk("\n"KERN_DEBUG " Rx ring %8.8x:\n",
1311: (int)virt_to_bus(np->rx_ring));
1312: for (i = 0; i < RX_RING_SIZE; i++) {
1313: printk(KERN_DEBUG " #%d desc. %8.8x %8.8x\n",
1314: i, np->rx_ring[i].cmd_status, (u32)np->rx_ring[i].buf_addr);
1315: }
1316: }
1317: #endif /* __i386__ debugging only */
1318:
1319: free_irq(dev->irq, dev);
1320:
1321: /* Free all the skbuffs in the Rx queue. */
1322: for (i = 0; i < RX_RING_SIZE; i++) {
1323: np->rx_ring[i].cmd_status = 0;
1324: np->rx_ring[i].buf_addr = 0xBADF00D0; /* An invalid address. */
1325: if (np->rx_skbuff[i]) {
1326: #if LINUX_VERSION_CODE < 0x20100
1327: np->rx_skbuff[i]->free = 1;
1328: #endif
1329: dev_free_skb(np->rx_skbuff[i]);
1330: }
1331: np->rx_skbuff[i] = 0;
1332: }
1333: for (i = 0; i < TX_RING_SIZE; i++) {
1334: if (np->tx_skbuff[i])
1335: dev_free_skb(np->tx_skbuff[i]);
1336: np->tx_skbuff[i] = 0;
1337: }
1338:
1339: #if 0
1340: writel(0x0200, ioaddr + ChipConfig); /* Power down Xcvr. */
1341: #endif
1342:
1343: MOD_DEC_USE_COUNT;
1344:
1345: return 0;
1346: }
1347:
1348: static int power_event(void *dev_instance, int event)
1349: {
1350: struct net_device *dev = dev_instance;
1351: struct netdev_private *np = (struct netdev_private *)dev->priv;
1352: long ioaddr = dev->base_addr;
1353:
1354: if (np->msg_level & NETIF_MSG_LINK)
1355: printk(KERN_DEBUG "%s: Handling power event %d.\n", dev->name, event);
1356: switch(event) {
1357: case DRV_ATTACH:
1358: MOD_INC_USE_COUNT;
1359: break;
1360: case DRV_SUSPEND:
1361: /* Disable interrupts, freeze stats, stop Tx and Rx. */
1362: writel(0, ioaddr + IntrEnable);
1363: writel(2, ioaddr + StatsCtrl);
1364: writel(RxOff | TxOff, ioaddr + ChipCmd);
1365: break;
1366: case DRV_RESUME:
1367: /* This is incomplete: the open() actions should be repeated. */
1368: set_rx_mode(dev);
1369: writel(np->intr_enable, ioaddr + IntrEnable);
1370: writel(1, ioaddr + IntrEnable);
1371: writel(RxOn | TxOn, ioaddr + ChipCmd);
1372: break;
1373: case DRV_DETACH: {
1374: struct net_device **devp, **next;
1375: if (dev->flags & IFF_UP) {
1376: /* Some, but not all, kernel versions close automatically. */
1377: dev_close(dev);
1378: dev->flags &= ~(IFF_UP|IFF_RUNNING);
1379: }
1380: unregister_netdev(dev);
1381: release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
1382: for (devp = &root_net_dev; *devp; devp = next) {
1383: next = &((struct netdev_private *)(*devp)->priv)->next_module;
1384: if (*devp == dev) {
1385: *devp = *next;
1386: break;
1387: }
1388: }
1389: if (np->priv_addr)
1390: kfree(np->priv_addr);
1391: kfree(dev);
1392: MOD_DEC_USE_COUNT;
1393: break;
1394: }
1395: }
1396:
1397: return 0;
1398: }
1399:
1400:
1401: #ifdef MODULE
1402: int init_module(void)
1403: {
1404: if (debug >= NETIF_MSG_DRV) /* Emit version even if no cards detected. */
1405: printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
1406: #ifdef CARDBUS
1407: register_driver(ðerdev_ops);
1408: return 0;
1409: #else
1410: return pci_drv_register(&natsemi_drv_id, NULL);
1411: #endif
1412: }
1413:
1414: void cleanup_module(void)
1415: {
1416: struct net_device *next_dev;
1417:
1418: #ifdef CARDBUS
1419: unregister_driver(ðerdev_ops);
1420: #else
1421: pci_drv_unregister(&natsemi_drv_id);
1422: #endif
1423:
1424: /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
1425: while (root_net_dev) {
1426: struct netdev_private *np = (void *)(root_net_dev->priv);
1427: unregister_netdev(root_net_dev);
1428: iounmap((char *)root_net_dev->base_addr);
1429: next_dev = np->next_module;
1430: if (np->priv_addr)
1431: kfree(np->priv_addr);
1432: kfree(root_net_dev);
1433: root_net_dev = next_dev;
1434: }
1435: }
1436:
1437: #endif /* MODULE */
1438:
1439: /*
1440: * Local variables:
1441: * compile-command: "make KERNVER=`uname -r` natsemi.o"
1442: * compile-cmd: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c natsemi.c"
1443: * simple-compile-command: "gcc -DMODULE -O6 -c natsemi.c"
1444: * c-indent-level: 4
1445: * c-basic-offset: 4
1446: * tab-width: 4
1447: * End:
1448: */
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