1 // SPDX-License-Identifier: GPL-2.0-only
2 /* $Id: sunlance.c,v 1.112 2002/01/15 06:48:55 davem Exp $
3  * lance.c: Linux/Sparc/Lance driver
4  *
5  *	Written 1995, 1996 by Miguel de Icaza
6  * Sources:
7  *	The Linux  depca driver
8  *	The Linux  lance driver.
9  *	The Linux  skeleton driver.
10  *	The NetBSD Sparc/Lance driver.
11  *	Theo de Raadt (deraadt@openbsd.org)
12  *	NCR92C990 Lan Controller manual
13  *
14  * 1.4:
15  *	Added support to run with a ledma on the Sun4m
16  *
17  * 1.5:
18  *	Added multiple card detection.
19  *
20  *	 4/17/96: Burst sizes and tpe selection on sun4m by Eddie C. Dost
21  *		  (ecd@skynet.be)
22  *
23  *	 5/15/96: auto carrier detection on sun4m by Eddie C. Dost
24  *		  (ecd@skynet.be)
25  *
26  *	 5/17/96: lebuffer on scsi/ether cards now work David S. Miller
27  *		  (davem@caip.rutgers.edu)
28  *
29  *	 5/29/96: override option 'tpe-link-test?', if it is 'false', as
30  *		  this disables auto carrier detection on sun4m. Eddie C. Dost
31  *		  (ecd@skynet.be)
32  *
33  * 1.7:
34  *	 6/26/96: Bug fix for multiple ledmas, miguel.
35  *
36  * 1.8:
37  *		  Stole multicast code from depca.c, fixed lance_tx.
38  *
39  * 1.9:
40  *	 8/21/96: Fixed the multicast code (Pedro Roque)
41  *
42  *	 8/28/96: Send fake packet in lance_open() if auto_select is true,
43  *		  so we can detect the carrier loss condition in time.
44  *		  Eddie C. Dost (ecd@skynet.be)
45  *
46  *	 9/15/96: Align rx_buf so that eth_copy_and_sum() won't cause an
47  *		  MNA trap during chksum_partial_copy(). (ecd@skynet.be)
48  *
49  *	11/17/96: Handle LE_C0_MERR in lance_interrupt(). (ecd@skynet.be)
50  *
51  *	12/22/96: Don't loop forever in lance_rx() on incomplete packets.
52  *		  This was the sun4c killer. Shit, stupid bug.
53  *		  (ecd@skynet.be)
54  *
55  * 1.10:
56  *	 1/26/97: Modularize driver. (ecd@skynet.be)
57  *
58  * 1.11:
59  *	12/27/97: Added sun4d support. (jj@sunsite.mff.cuni.cz)
60  *
61  * 1.12:
62  * 	 11/3/99: Fixed SMP race in lance_start_xmit found by davem.
63  * 	          Anton Blanchard (anton@progsoc.uts.edu.au)
64  * 2.00: 11/9/99: Massive overhaul and port to new SBUS driver interfaces.
65  *		  David S. Miller (davem@redhat.com)
66  * 2.01:
67  *      11/08/01: Use library crc32 functions (Matt_Domsch@dell.com)
68  *
69  */
70 
71 #undef DEBUG_DRIVER
72 
73 static char lancestr[] = "LANCE";
74 
75 #include <linux/module.h>
76 #include <linux/kernel.h>
77 #include <linux/types.h>
78 #include <linux/fcntl.h>
79 #include <linux/interrupt.h>
80 #include <linux/ioport.h>
81 #include <linux/in.h>
82 #include <linux/string.h>
83 #include <linux/delay.h>
84 #include <linux/crc32.h>
85 #include <linux/errno.h>
86 #include <linux/socket.h> /* Used for the temporal inet entries and routing */
87 #include <linux/route.h>
88 #include <linux/netdevice.h>
89 #include <linux/etherdevice.h>
90 #include <linux/skbuff.h>
91 #include <linux/ethtool.h>
92 #include <linux/bitops.h>
93 #include <linux/dma-mapping.h>
94 #include <linux/of.h>
95 #include <linux/of_device.h>
96 #include <linux/gfp.h>
97 
98 #include <asm/io.h>
99 #include <asm/dma.h>
100 #include <asm/pgtable.h>
101 #include <asm/byteorder.h>	/* Used by the checksum routines */
102 #include <asm/idprom.h>
103 #include <asm/prom.h>
104 #include <asm/auxio.h>		/* For tpe-link-test? setting */
105 #include <asm/irq.h>
106 
107 #define DRV_NAME	"sunlance"
108 #define DRV_RELDATE	"8/24/03"
109 #define DRV_AUTHOR	"Miguel de Icaza (miguel@nuclecu.unam.mx)"
110 
111 MODULE_AUTHOR(DRV_AUTHOR);
112 MODULE_DESCRIPTION("Sun Lance ethernet driver");
113 MODULE_LICENSE("GPL");
114 
115 /* Define: 2^4 Tx buffers and 2^4 Rx buffers */
116 #ifndef LANCE_LOG_TX_BUFFERS
117 #define LANCE_LOG_TX_BUFFERS 4
118 #define LANCE_LOG_RX_BUFFERS 4
119 #endif
120 
121 #define LE_CSR0 0
122 #define LE_CSR1 1
123 #define LE_CSR2 2
124 #define LE_CSR3 3
125 
126 #define LE_MO_PROM      0x8000  /* Enable promiscuous mode */
127 
128 #define	LE_C0_ERR	0x8000	/* Error: set if BAB, SQE, MISS or ME is set */
129 #define	LE_C0_BABL	0x4000	/* BAB:  Babble: tx timeout. */
130 #define	LE_C0_CERR	0x2000	/* SQE:  Signal quality error */
131 #define	LE_C0_MISS	0x1000	/* MISS: Missed a packet */
132 #define	LE_C0_MERR	0x0800	/* ME:   Memory error */
133 #define	LE_C0_RINT	0x0400	/* Received interrupt */
134 #define	LE_C0_TINT	0x0200	/* Transmitter Interrupt */
135 #define	LE_C0_IDON	0x0100	/* IFIN: Init finished. */
136 #define	LE_C0_INTR	0x0080	/* Interrupt or error */
137 #define	LE_C0_INEA	0x0040	/* Interrupt enable */
138 #define	LE_C0_RXON	0x0020	/* Receiver on */
139 #define	LE_C0_TXON	0x0010	/* Transmitter on */
140 #define	LE_C0_TDMD	0x0008	/* Transmitter demand */
141 #define	LE_C0_STOP	0x0004	/* Stop the card */
142 #define	LE_C0_STRT	0x0002	/* Start the card */
143 #define	LE_C0_INIT	0x0001	/* Init the card */
144 
145 #define	LE_C3_BSWP	0x4     /* SWAP */
146 #define	LE_C3_ACON	0x2	/* ALE Control */
147 #define	LE_C3_BCON	0x1	/* Byte control */
148 
149 /* Receive message descriptor 1 */
150 #define LE_R1_OWN       0x80    /* Who owns the entry */
151 #define LE_R1_ERR       0x40    /* Error: if FRA, OFL, CRC or BUF is set */
152 #define LE_R1_FRA       0x20    /* FRA: Frame error */
153 #define LE_R1_OFL       0x10    /* OFL: Frame overflow */
154 #define LE_R1_CRC       0x08    /* CRC error */
155 #define LE_R1_BUF       0x04    /* BUF: Buffer error */
156 #define LE_R1_SOP       0x02    /* Start of packet */
157 #define LE_R1_EOP       0x01    /* End of packet */
158 #define LE_R1_POK       0x03    /* Packet is complete: SOP + EOP */
159 
160 #define LE_T1_OWN       0x80    /* Lance owns the packet */
161 #define LE_T1_ERR       0x40    /* Error summary */
162 #define LE_T1_EMORE     0x10    /* Error: more than one retry needed */
163 #define LE_T1_EONE      0x08    /* Error: one retry needed */
164 #define LE_T1_EDEF      0x04    /* Error: deferred */
165 #define LE_T1_SOP       0x02    /* Start of packet */
166 #define LE_T1_EOP       0x01    /* End of packet */
167 #define LE_T1_POK	0x03	/* Packet is complete: SOP + EOP */
168 
169 #define LE_T3_BUF       0x8000  /* Buffer error */
170 #define LE_T3_UFL       0x4000  /* Error underflow */
171 #define LE_T3_LCOL      0x1000  /* Error late collision */
172 #define LE_T3_CLOS      0x0800  /* Error carrier loss */
173 #define LE_T3_RTY       0x0400  /* Error retry */
174 #define LE_T3_TDR       0x03ff  /* Time Domain Reflectometry counter */
175 
176 #define TX_RING_SIZE			(1 << (LANCE_LOG_TX_BUFFERS))
177 #define TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
178 #define TX_RING_LEN_BITS		((LANCE_LOG_TX_BUFFERS) << 29)
179 #define TX_NEXT(__x)			(((__x)+1) & TX_RING_MOD_MASK)
180 
181 #define RX_RING_SIZE			(1 << (LANCE_LOG_RX_BUFFERS))
182 #define RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
183 #define RX_RING_LEN_BITS		((LANCE_LOG_RX_BUFFERS) << 29)
184 #define RX_NEXT(__x)			(((__x)+1) & RX_RING_MOD_MASK)
185 
186 #define PKT_BUF_SZ		1544
187 #define RX_BUFF_SIZE            PKT_BUF_SZ
188 #define TX_BUFF_SIZE            PKT_BUF_SZ
189 
190 struct lance_rx_desc {
191 	u16	rmd0;		/* low address of packet */
192 	u8	rmd1_bits;	/* descriptor bits */
193 	u8	rmd1_hadr;	/* high address of packet */
194 	s16	length;		/* This length is 2s complement (negative)!
195 				 * Buffer length
196 				 */
197 	u16	mblength;	/* This is the actual number of bytes received */
198 };
199 
200 struct lance_tx_desc {
201 	u16	tmd0;		/* low address of packet */
202 	u8 	tmd1_bits;	/* descriptor bits */
203 	u8 	tmd1_hadr;	/* high address of packet */
204 	s16 	length;		/* Length is 2s complement (negative)! */
205 	u16 	misc;
206 };
207 
208 /* The LANCE initialization block, described in databook. */
209 /* On the Sparc, this block should be on a DMA region     */
210 struct lance_init_block {
211 	u16	mode;		/* Pre-set mode (reg. 15) */
212 	u8	phys_addr[6];	/* Physical ethernet address */
213 	u32	filter[2];	/* Multicast filter. */
214 
215 	/* Receive and transmit ring base, along with extra bits. */
216 	u16	rx_ptr;		/* receive descriptor addr */
217 	u16	rx_len;		/* receive len and high addr */
218 	u16	tx_ptr;		/* transmit descriptor addr */
219 	u16	tx_len;		/* transmit len and high addr */
220 
221 	/* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
222 	struct lance_rx_desc brx_ring[RX_RING_SIZE];
223 	struct lance_tx_desc btx_ring[TX_RING_SIZE];
224 
225 	u8	tx_buf [TX_RING_SIZE][TX_BUFF_SIZE];
226 	u8	pad[2];		/* align rx_buf for copy_and_sum(). */
227 	u8	rx_buf [RX_RING_SIZE][RX_BUFF_SIZE];
228 };
229 
230 #define libdesc_offset(rt, elem) \
231 ((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem])))))
232 
233 #define libbuff_offset(rt, elem) \
234 ((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem][0])))))
235 
236 struct lance_private {
237 	void __iomem	*lregs;		/* Lance RAP/RDP regs.		*/
238 	void __iomem	*dregs;		/* DMA controller regs.		*/
239 	struct lance_init_block __iomem *init_block_iomem;
240 	struct lance_init_block *init_block_mem;
241 
242 	spinlock_t	lock;
243 
244 	int		rx_new, tx_new;
245 	int		rx_old, tx_old;
246 
247 	struct platform_device *ledma;	/* If set this points to ledma	*/
248 	char		tpe;		/* cable-selection is TPE	*/
249 	char		auto_select;	/* cable-selection by carrier	*/
250 	char		burst_sizes;	/* ledma SBus burst sizes	*/
251 	char		pio_buffer;	/* init block in PIO space?	*/
252 
253 	unsigned short	busmaster_regval;
254 
255 	void (*init_ring)(struct net_device *);
256 	void (*rx)(struct net_device *);
257 	void (*tx)(struct net_device *);
258 
259 	char	       	       *name;
260 	dma_addr_t		init_block_dvma;
261 	struct net_device      *dev;		  /* Backpointer	*/
262 	struct platform_device       *op;
263 	struct platform_device       *lebuffer;
264 	struct timer_list       multicast_timer;
265 };
266 
267 #define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
268 			lp->tx_old+TX_RING_MOD_MASK-lp->tx_new:\
269 			lp->tx_old - lp->tx_new-1)
270 
271 /* Lance registers. */
272 #define RDP		0x00UL		/* register data port		*/
273 #define RAP		0x02UL		/* register address port	*/
274 #define LANCE_REG_SIZE	0x04UL
275 
276 #define STOP_LANCE(__lp) \
277 do {	void __iomem *__base = (__lp)->lregs; \
278 	sbus_writew(LE_CSR0,	__base + RAP); \
279 	sbus_writew(LE_C0_STOP,	__base + RDP); \
280 } while (0)
281 
282 int sparc_lance_debug = 2;
283 
284 /* The Lance uses 24 bit addresses */
285 /* On the Sun4c the DVMA will provide the remaining bytes for us */
286 /* On the Sun4m we have to instruct the ledma to provide them    */
287 /* Even worse, on scsi/ether SBUS cards, the init block and the
288  * transmit/receive buffers are addresses as offsets from absolute
289  * zero on the lebuffer PIO area. -DaveM
290  */
291 
292 #define LANCE_ADDR(x) ((long)(x) & ~0xff000000)
293 
294 /* Load the CSR registers */
295 static void load_csrs(struct lance_private *lp)
296 {
297 	u32 leptr;
298 
299 	if (lp->pio_buffer)
300 		leptr = 0;
301 	else
302 		leptr = LANCE_ADDR(lp->init_block_dvma);
303 
304 	sbus_writew(LE_CSR1,		  lp->lregs + RAP);
305 	sbus_writew(leptr & 0xffff,	  lp->lregs + RDP);
306 	sbus_writew(LE_CSR2,		  lp->lregs + RAP);
307 	sbus_writew(leptr >> 16,	  lp->lregs + RDP);
308 	sbus_writew(LE_CSR3,		  lp->lregs + RAP);
309 	sbus_writew(lp->busmaster_regval, lp->lregs + RDP);
310 
311 	/* Point back to csr0 */
312 	sbus_writew(LE_CSR0, lp->lregs + RAP);
313 }
314 
315 /* Setup the Lance Rx and Tx rings */
316 static void lance_init_ring_dvma(struct net_device *dev)
317 {
318 	struct lance_private *lp = netdev_priv(dev);
319 	struct lance_init_block *ib = lp->init_block_mem;
320 	dma_addr_t aib = lp->init_block_dvma;
321 	__u32 leptr;
322 	int i;
323 
324 	/* Lock out other processes while setting up hardware */
325 	netif_stop_queue(dev);
326 	lp->rx_new = lp->tx_new = 0;
327 	lp->rx_old = lp->tx_old = 0;
328 
329 	/* Copy the ethernet address to the lance init block
330 	 * Note that on the sparc you need to swap the ethernet address.
331 	 */
332 	ib->phys_addr [0] = dev->dev_addr [1];
333 	ib->phys_addr [1] = dev->dev_addr [0];
334 	ib->phys_addr [2] = dev->dev_addr [3];
335 	ib->phys_addr [3] = dev->dev_addr [2];
336 	ib->phys_addr [4] = dev->dev_addr [5];
337 	ib->phys_addr [5] = dev->dev_addr [4];
338 
339 	/* Setup the Tx ring entries */
340 	for (i = 0; i < TX_RING_SIZE; i++) {
341 		leptr = LANCE_ADDR(aib + libbuff_offset(tx_buf, i));
342 		ib->btx_ring [i].tmd0      = leptr;
343 		ib->btx_ring [i].tmd1_hadr = leptr >> 16;
344 		ib->btx_ring [i].tmd1_bits = 0;
345 		ib->btx_ring [i].length    = 0xf000; /* The ones required by tmd2 */
346 		ib->btx_ring [i].misc      = 0;
347 	}
348 
349 	/* Setup the Rx ring entries */
350 	for (i = 0; i < RX_RING_SIZE; i++) {
351 		leptr = LANCE_ADDR(aib + libbuff_offset(rx_buf, i));
352 
353 		ib->brx_ring [i].rmd0      = leptr;
354 		ib->brx_ring [i].rmd1_hadr = leptr >> 16;
355 		ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
356 		ib->brx_ring [i].length    = -RX_BUFF_SIZE | 0xf000;
357 		ib->brx_ring [i].mblength  = 0;
358 	}
359 
360 	/* Setup the initialization block */
361 
362 	/* Setup rx descriptor pointer */
363 	leptr = LANCE_ADDR(aib + libdesc_offset(brx_ring, 0));
364 	ib->rx_len = (LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16);
365 	ib->rx_ptr = leptr;
366 
367 	/* Setup tx descriptor pointer */
368 	leptr = LANCE_ADDR(aib + libdesc_offset(btx_ring, 0));
369 	ib->tx_len = (LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16);
370 	ib->tx_ptr = leptr;
371 }
372 
373 static void lance_init_ring_pio(struct net_device *dev)
374 {
375 	struct lance_private *lp = netdev_priv(dev);
376 	struct lance_init_block __iomem *ib = lp->init_block_iomem;
377 	u32 leptr;
378 	int i;
379 
380 	/* Lock out other processes while setting up hardware */
381 	netif_stop_queue(dev);
382 	lp->rx_new = lp->tx_new = 0;
383 	lp->rx_old = lp->tx_old = 0;
384 
385 	/* Copy the ethernet address to the lance init block
386 	 * Note that on the sparc you need to swap the ethernet address.
387 	 */
388 	sbus_writeb(dev->dev_addr[1], &ib->phys_addr[0]);
389 	sbus_writeb(dev->dev_addr[0], &ib->phys_addr[1]);
390 	sbus_writeb(dev->dev_addr[3], &ib->phys_addr[2]);
391 	sbus_writeb(dev->dev_addr[2], &ib->phys_addr[3]);
392 	sbus_writeb(dev->dev_addr[5], &ib->phys_addr[4]);
393 	sbus_writeb(dev->dev_addr[4], &ib->phys_addr[5]);
394 
395 	/* Setup the Tx ring entries */
396 	for (i = 0; i < TX_RING_SIZE; i++) {
397 		leptr = libbuff_offset(tx_buf, i);
398 		sbus_writew(leptr,	&ib->btx_ring [i].tmd0);
399 		sbus_writeb(leptr >> 16,&ib->btx_ring [i].tmd1_hadr);
400 		sbus_writeb(0,		&ib->btx_ring [i].tmd1_bits);
401 
402 		/* The ones required by tmd2 */
403 		sbus_writew(0xf000,	&ib->btx_ring [i].length);
404 		sbus_writew(0,		&ib->btx_ring [i].misc);
405 	}
406 
407 	/* Setup the Rx ring entries */
408 	for (i = 0; i < RX_RING_SIZE; i++) {
409 		leptr = libbuff_offset(rx_buf, i);
410 
411 		sbus_writew(leptr,	&ib->brx_ring [i].rmd0);
412 		sbus_writeb(leptr >> 16,&ib->brx_ring [i].rmd1_hadr);
413 		sbus_writeb(LE_R1_OWN,	&ib->brx_ring [i].rmd1_bits);
414 		sbus_writew(-RX_BUFF_SIZE|0xf000,
415 			    &ib->brx_ring [i].length);
416 		sbus_writew(0,		&ib->brx_ring [i].mblength);
417 	}
418 
419 	/* Setup the initialization block */
420 
421 	/* Setup rx descriptor pointer */
422 	leptr = libdesc_offset(brx_ring, 0);
423 	sbus_writew((LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16),
424 		    &ib->rx_len);
425 	sbus_writew(leptr, &ib->rx_ptr);
426 
427 	/* Setup tx descriptor pointer */
428 	leptr = libdesc_offset(btx_ring, 0);
429 	sbus_writew((LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16),
430 		    &ib->tx_len);
431 	sbus_writew(leptr, &ib->tx_ptr);
432 }
433 
434 static void init_restart_ledma(struct lance_private *lp)
435 {
436 	u32 csr = sbus_readl(lp->dregs + DMA_CSR);
437 
438 	if (!(csr & DMA_HNDL_ERROR)) {
439 		/* E-Cache draining */
440 		while (sbus_readl(lp->dregs + DMA_CSR) & DMA_FIFO_ISDRAIN)
441 			barrier();
442 	}
443 
444 	csr = sbus_readl(lp->dregs + DMA_CSR);
445 	csr &= ~DMA_E_BURSTS;
446 	if (lp->burst_sizes & DMA_BURST32)
447 		csr |= DMA_E_BURST32;
448 	else
449 		csr |= DMA_E_BURST16;
450 
451 	csr |= (DMA_DSBL_RD_DRN | DMA_DSBL_WR_INV | DMA_FIFO_INV);
452 
453 	if (lp->tpe)
454 		csr |= DMA_EN_ENETAUI;
455 	else
456 		csr &= ~DMA_EN_ENETAUI;
457 	udelay(20);
458 	sbus_writel(csr, lp->dregs + DMA_CSR);
459 	udelay(200);
460 }
461 
462 static int init_restart_lance(struct lance_private *lp)
463 {
464 	u16 regval = 0;
465 	int i;
466 
467 	if (lp->dregs)
468 		init_restart_ledma(lp);
469 
470 	sbus_writew(LE_CSR0,	lp->lregs + RAP);
471 	sbus_writew(LE_C0_INIT,	lp->lregs + RDP);
472 
473 	/* Wait for the lance to complete initialization */
474 	for (i = 0; i < 100; i++) {
475 		regval = sbus_readw(lp->lregs + RDP);
476 
477 		if (regval & (LE_C0_ERR | LE_C0_IDON))
478 			break;
479 		barrier();
480 	}
481 	if (i == 100 || (regval & LE_C0_ERR)) {
482 		printk(KERN_ERR "LANCE unopened after %d ticks, csr0=%4.4x.\n",
483 		       i, regval);
484 		if (lp->dregs)
485 			printk("dcsr=%8.8x\n", sbus_readl(lp->dregs + DMA_CSR));
486 		return -1;
487 	}
488 
489 	/* Clear IDON by writing a "1", enable interrupts and start lance */
490 	sbus_writew(LE_C0_IDON,			lp->lregs + RDP);
491 	sbus_writew(LE_C0_INEA | LE_C0_STRT,	lp->lregs + RDP);
492 
493 	if (lp->dregs) {
494 		u32 csr = sbus_readl(lp->dregs + DMA_CSR);
495 
496 		csr |= DMA_INT_ENAB;
497 		sbus_writel(csr, lp->dregs + DMA_CSR);
498 	}
499 
500 	return 0;
501 }
502 
503 static void lance_rx_dvma(struct net_device *dev)
504 {
505 	struct lance_private *lp = netdev_priv(dev);
506 	struct lance_init_block *ib = lp->init_block_mem;
507 	struct lance_rx_desc *rd;
508 	u8 bits;
509 	int len, entry = lp->rx_new;
510 	struct sk_buff *skb;
511 
512 	for (rd = &ib->brx_ring [entry];
513 	     !((bits = rd->rmd1_bits) & LE_R1_OWN);
514 	     rd = &ib->brx_ring [entry]) {
515 
516 		/* We got an incomplete frame? */
517 		if ((bits & LE_R1_POK) != LE_R1_POK) {
518 			dev->stats.rx_over_errors++;
519 			dev->stats.rx_errors++;
520 		} else if (bits & LE_R1_ERR) {
521 			/* Count only the end frame as a rx error,
522 			 * not the beginning
523 			 */
524 			if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
525 			if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
526 			if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
527 			if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
528 			if (bits & LE_R1_EOP) dev->stats.rx_errors++;
529 		} else {
530 			len = (rd->mblength & 0xfff) - 4;
531 			skb = netdev_alloc_skb(dev, len + 2);
532 
533 			if (skb == NULL) {
534 				dev->stats.rx_dropped++;
535 				rd->mblength = 0;
536 				rd->rmd1_bits = LE_R1_OWN;
537 				lp->rx_new = RX_NEXT(entry);
538 				return;
539 			}
540 
541 			dev->stats.rx_bytes += len;
542 
543 			skb_reserve(skb, 2);		/* 16 byte align */
544 			skb_put(skb, len);		/* make room */
545 			skb_copy_to_linear_data(skb,
546 					 (unsigned char *)&(ib->rx_buf [entry][0]),
547 					 len);
548 			skb->protocol = eth_type_trans(skb, dev);
549 			netif_rx(skb);
550 			dev->stats.rx_packets++;
551 		}
552 
553 		/* Return the packet to the pool */
554 		rd->mblength = 0;
555 		rd->rmd1_bits = LE_R1_OWN;
556 		entry = RX_NEXT(entry);
557 	}
558 
559 	lp->rx_new = entry;
560 }
561 
562 static void lance_tx_dvma(struct net_device *dev)
563 {
564 	struct lance_private *lp = netdev_priv(dev);
565 	struct lance_init_block *ib = lp->init_block_mem;
566 	int i, j;
567 
568 	spin_lock(&lp->lock);
569 
570 	j = lp->tx_old;
571 	for (i = j; i != lp->tx_new; i = j) {
572 		struct lance_tx_desc *td = &ib->btx_ring [i];
573 		u8 bits = td->tmd1_bits;
574 
575 		/* If we hit a packet not owned by us, stop */
576 		if (bits & LE_T1_OWN)
577 			break;
578 
579 		if (bits & LE_T1_ERR) {
580 			u16 status = td->misc;
581 
582 			dev->stats.tx_errors++;
583 			if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
584 			if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;
585 
586 			if (status & LE_T3_CLOS) {
587 				dev->stats.tx_carrier_errors++;
588 				if (lp->auto_select) {
589 					lp->tpe = 1 - lp->tpe;
590 					printk(KERN_NOTICE "%s: Carrier Lost, trying %s\n",
591 					       dev->name, lp->tpe?"TPE":"AUI");
592 					STOP_LANCE(lp);
593 					lp->init_ring(dev);
594 					load_csrs(lp);
595 					init_restart_lance(lp);
596 					goto out;
597 				}
598 			}
599 
600 			/* Buffer errors and underflows turn off the
601 			 * transmitter, restart the adapter.
602 			 */
603 			if (status & (LE_T3_BUF|LE_T3_UFL)) {
604 				dev->stats.tx_fifo_errors++;
605 
606 				printk(KERN_ERR "%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
607 				       dev->name);
608 				STOP_LANCE(lp);
609 				lp->init_ring(dev);
610 				load_csrs(lp);
611 				init_restart_lance(lp);
612 				goto out;
613 			}
614 		} else if ((bits & LE_T1_POK) == LE_T1_POK) {
615 			/*
616 			 * So we don't count the packet more than once.
617 			 */
618 			td->tmd1_bits = bits & ~(LE_T1_POK);
619 
620 			/* One collision before packet was sent. */
621 			if (bits & LE_T1_EONE)
622 				dev->stats.collisions++;
623 
624 			/* More than one collision, be optimistic. */
625 			if (bits & LE_T1_EMORE)
626 				dev->stats.collisions += 2;
627 
628 			dev->stats.tx_packets++;
629 		}
630 
631 		j = TX_NEXT(j);
632 	}
633 	lp->tx_old = j;
634 out:
635 	if (netif_queue_stopped(dev) &&
636 	    TX_BUFFS_AVAIL > 0)
637 		netif_wake_queue(dev);
638 
639 	spin_unlock(&lp->lock);
640 }
641 
642 static void lance_piocopy_to_skb(struct sk_buff *skb, void __iomem *piobuf, int len)
643 {
644 	u16 *p16 = (u16 *) skb->data;
645 	u32 *p32;
646 	u8 *p8;
647 	void __iomem *pbuf = piobuf;
648 
649 	/* We know here that both src and dest are on a 16bit boundary. */
650 	*p16++ = sbus_readw(pbuf);
651 	p32 = (u32 *) p16;
652 	pbuf += 2;
653 	len -= 2;
654 
655 	while (len >= 4) {
656 		*p32++ = sbus_readl(pbuf);
657 		pbuf += 4;
658 		len -= 4;
659 	}
660 	p8 = (u8 *) p32;
661 	if (len >= 2) {
662 		p16 = (u16 *) p32;
663 		*p16++ = sbus_readw(pbuf);
664 		pbuf += 2;
665 		len -= 2;
666 		p8 = (u8 *) p16;
667 	}
668 	if (len >= 1)
669 		*p8 = sbus_readb(pbuf);
670 }
671 
672 static void lance_rx_pio(struct net_device *dev)
673 {
674 	struct lance_private *lp = netdev_priv(dev);
675 	struct lance_init_block __iomem *ib = lp->init_block_iomem;
676 	struct lance_rx_desc __iomem *rd;
677 	unsigned char bits;
678 	int len, entry;
679 	struct sk_buff *skb;
680 
681 	entry = lp->rx_new;
682 	for (rd = &ib->brx_ring [entry];
683 	     !((bits = sbus_readb(&rd->rmd1_bits)) & LE_R1_OWN);
684 	     rd = &ib->brx_ring [entry]) {
685 
686 		/* We got an incomplete frame? */
687 		if ((bits & LE_R1_POK) != LE_R1_POK) {
688 			dev->stats.rx_over_errors++;
689 			dev->stats.rx_errors++;
690 		} else if (bits & LE_R1_ERR) {
691 			/* Count only the end frame as a rx error,
692 			 * not the beginning
693 			 */
694 			if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
695 			if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
696 			if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
697 			if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
698 			if (bits & LE_R1_EOP) dev->stats.rx_errors++;
699 		} else {
700 			len = (sbus_readw(&rd->mblength) & 0xfff) - 4;
701 			skb = netdev_alloc_skb(dev, len + 2);
702 
703 			if (skb == NULL) {
704 				dev->stats.rx_dropped++;
705 				sbus_writew(0, &rd->mblength);
706 				sbus_writeb(LE_R1_OWN, &rd->rmd1_bits);
707 				lp->rx_new = RX_NEXT(entry);
708 				return;
709 			}
710 
711 			dev->stats.rx_bytes += len;
712 
713 			skb_reserve (skb, 2);		/* 16 byte align */
714 			skb_put(skb, len);		/* make room */
715 			lance_piocopy_to_skb(skb, &(ib->rx_buf[entry][0]), len);
716 			skb->protocol = eth_type_trans(skb, dev);
717 			netif_rx(skb);
718 			dev->stats.rx_packets++;
719 		}
720 
721 		/* Return the packet to the pool */
722 		sbus_writew(0, &rd->mblength);
723 		sbus_writeb(LE_R1_OWN, &rd->rmd1_bits);
724 		entry = RX_NEXT(entry);
725 	}
726 
727 	lp->rx_new = entry;
728 }
729 
730 static void lance_tx_pio(struct net_device *dev)
731 {
732 	struct lance_private *lp = netdev_priv(dev);
733 	struct lance_init_block __iomem *ib = lp->init_block_iomem;
734 	int i, j;
735 
736 	spin_lock(&lp->lock);
737 
738 	j = lp->tx_old;
739 	for (i = j; i != lp->tx_new; i = j) {
740 		struct lance_tx_desc __iomem *td = &ib->btx_ring [i];
741 		u8 bits = sbus_readb(&td->tmd1_bits);
742 
743 		/* If we hit a packet not owned by us, stop */
744 		if (bits & LE_T1_OWN)
745 			break;
746 
747 		if (bits & LE_T1_ERR) {
748 			u16 status = sbus_readw(&td->misc);
749 
750 			dev->stats.tx_errors++;
751 			if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
752 			if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;
753 
754 			if (status & LE_T3_CLOS) {
755 				dev->stats.tx_carrier_errors++;
756 				if (lp->auto_select) {
757 					lp->tpe = 1 - lp->tpe;
758 					printk(KERN_NOTICE "%s: Carrier Lost, trying %s\n",
759 					       dev->name, lp->tpe?"TPE":"AUI");
760 					STOP_LANCE(lp);
761 					lp->init_ring(dev);
762 					load_csrs(lp);
763 					init_restart_lance(lp);
764 					goto out;
765 				}
766 			}
767 
768 			/* Buffer errors and underflows turn off the
769 			 * transmitter, restart the adapter.
770 			 */
771 			if (status & (LE_T3_BUF|LE_T3_UFL)) {
772 				dev->stats.tx_fifo_errors++;
773 
774 				printk(KERN_ERR "%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
775 				       dev->name);
776 				STOP_LANCE(lp);
777 				lp->init_ring(dev);
778 				load_csrs(lp);
779 				init_restart_lance(lp);
780 				goto out;
781 			}
782 		} else if ((bits & LE_T1_POK) == LE_T1_POK) {
783 			/*
784 			 * So we don't count the packet more than once.
785 			 */
786 			sbus_writeb(bits & ~(LE_T1_POK), &td->tmd1_bits);
787 
788 			/* One collision before packet was sent. */
789 			if (bits & LE_T1_EONE)
790 				dev->stats.collisions++;
791 
792 			/* More than one collision, be optimistic. */
793 			if (bits & LE_T1_EMORE)
794 				dev->stats.collisions += 2;
795 
796 			dev->stats.tx_packets++;
797 		}
798 
799 		j = TX_NEXT(j);
800 	}
801 	lp->tx_old = j;
802 
803 	if (netif_queue_stopped(dev) &&
804 	    TX_BUFFS_AVAIL > 0)
805 		netif_wake_queue(dev);
806 out:
807 	spin_unlock(&lp->lock);
808 }
809 
810 static irqreturn_t lance_interrupt(int irq, void *dev_id)
811 {
812 	struct net_device *dev = dev_id;
813 	struct lance_private *lp = netdev_priv(dev);
814 	int csr0;
815 
816 	sbus_writew(LE_CSR0, lp->lregs + RAP);
817 	csr0 = sbus_readw(lp->lregs + RDP);
818 
819 	/* Acknowledge all the interrupt sources ASAP */
820 	sbus_writew(csr0 & (LE_C0_INTR | LE_C0_TINT | LE_C0_RINT),
821 		    lp->lregs + RDP);
822 
823 	if ((csr0 & LE_C0_ERR) != 0) {
824 		/* Clear the error condition */
825 		sbus_writew((LE_C0_BABL | LE_C0_ERR | LE_C0_MISS |
826 			     LE_C0_CERR | LE_C0_MERR),
827 			    lp->lregs + RDP);
828 	}
829 
830 	if (csr0 & LE_C0_RINT)
831 		lp->rx(dev);
832 
833 	if (csr0 & LE_C0_TINT)
834 		lp->tx(dev);
835 
836 	if (csr0 & LE_C0_BABL)
837 		dev->stats.tx_errors++;
838 
839 	if (csr0 & LE_C0_MISS)
840 		dev->stats.rx_errors++;
841 
842 	if (csr0 & LE_C0_MERR) {
843 		if (lp->dregs) {
844 			u32 addr = sbus_readl(lp->dregs + DMA_ADDR);
845 
846 			printk(KERN_ERR "%s: Memory error, status %04x, addr %06x\n",
847 			       dev->name, csr0, addr & 0xffffff);
848 		} else {
849 			printk(KERN_ERR "%s: Memory error, status %04x\n",
850 			       dev->name, csr0);
851 		}
852 
853 		sbus_writew(LE_C0_STOP, lp->lregs + RDP);
854 
855 		if (lp->dregs) {
856 			u32 dma_csr = sbus_readl(lp->dregs + DMA_CSR);
857 
858 			dma_csr |= DMA_FIFO_INV;
859 			sbus_writel(dma_csr, lp->dregs + DMA_CSR);
860 		}
861 
862 		lp->init_ring(dev);
863 		load_csrs(lp);
864 		init_restart_lance(lp);
865 		netif_wake_queue(dev);
866 	}
867 
868 	sbus_writew(LE_C0_INEA, lp->lregs + RDP);
869 
870 	return IRQ_HANDLED;
871 }
872 
873 /* Build a fake network packet and send it to ourselves. */
874 static void build_fake_packet(struct lance_private *lp)
875 {
876 	struct net_device *dev = lp->dev;
877 	int i, entry;
878 
879 	entry = lp->tx_new & TX_RING_MOD_MASK;
880 	if (lp->pio_buffer) {
881 		struct lance_init_block __iomem *ib = lp->init_block_iomem;
882 		u16 __iomem *packet = (u16 __iomem *) &(ib->tx_buf[entry][0]);
883 		struct ethhdr __iomem *eth = (struct ethhdr __iomem *) packet;
884 		for (i = 0; i < (ETH_ZLEN / sizeof(u16)); i++)
885 			sbus_writew(0, &packet[i]);
886 		for (i = 0; i < 6; i++) {
887 			sbus_writeb(dev->dev_addr[i], &eth->h_dest[i]);
888 			sbus_writeb(dev->dev_addr[i], &eth->h_source[i]);
889 		}
890 		sbus_writew((-ETH_ZLEN) | 0xf000, &ib->btx_ring[entry].length);
891 		sbus_writew(0, &ib->btx_ring[entry].misc);
892 		sbus_writeb(LE_T1_POK|LE_T1_OWN, &ib->btx_ring[entry].tmd1_bits);
893 	} else {
894 		struct lance_init_block *ib = lp->init_block_mem;
895 		u16 *packet = (u16 *) &(ib->tx_buf[entry][0]);
896 		struct ethhdr *eth = (struct ethhdr *) packet;
897 		memset(packet, 0, ETH_ZLEN);
898 		for (i = 0; i < 6; i++) {
899 			eth->h_dest[i] = dev->dev_addr[i];
900 			eth->h_source[i] = dev->dev_addr[i];
901 		}
902 		ib->btx_ring[entry].length = (-ETH_ZLEN) | 0xf000;
903 		ib->btx_ring[entry].misc = 0;
904 		ib->btx_ring[entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
905 	}
906 	lp->tx_new = TX_NEXT(entry);
907 }
908 
909 static int lance_open(struct net_device *dev)
910 {
911 	struct lance_private *lp = netdev_priv(dev);
912 	int status = 0;
913 
914 	STOP_LANCE(lp);
915 
916 	if (request_irq(dev->irq, lance_interrupt, IRQF_SHARED,
917 			lancestr, (void *) dev)) {
918 		printk(KERN_ERR "Lance: Can't get irq %d\n", dev->irq);
919 		return -EAGAIN;
920 	}
921 
922 	/* On the 4m, setup the ledma to provide the upper bits for buffers */
923 	if (lp->dregs) {
924 		u32 regval = lp->init_block_dvma & 0xff000000;
925 
926 		sbus_writel(regval, lp->dregs + DMA_TEST);
927 	}
928 
929 	/* Set mode and clear multicast filter only at device open,
930 	 * so that lance_init_ring() called at any error will not
931 	 * forget multicast filters.
932 	 *
933 	 * BTW it is common bug in all lance drivers! --ANK
934 	 */
935 	if (lp->pio_buffer) {
936 		struct lance_init_block __iomem *ib = lp->init_block_iomem;
937 		sbus_writew(0, &ib->mode);
938 		sbus_writel(0, &ib->filter[0]);
939 		sbus_writel(0, &ib->filter[1]);
940 	} else {
941 		struct lance_init_block *ib = lp->init_block_mem;
942 		ib->mode = 0;
943 		ib->filter [0] = 0;
944 		ib->filter [1] = 0;
945 	}
946 
947 	lp->init_ring(dev);
948 	load_csrs(lp);
949 
950 	netif_start_queue(dev);
951 
952 	status = init_restart_lance(lp);
953 	if (!status && lp->auto_select) {
954 		build_fake_packet(lp);
955 		sbus_writew(LE_C0_INEA | LE_C0_TDMD, lp->lregs + RDP);
956 	}
957 
958 	return status;
959 }
960 
961 static int lance_close(struct net_device *dev)
962 {
963 	struct lance_private *lp = netdev_priv(dev);
964 
965 	netif_stop_queue(dev);
966 	del_timer_sync(&lp->multicast_timer);
967 
968 	STOP_LANCE(lp);
969 
970 	free_irq(dev->irq, (void *) dev);
971 	return 0;
972 }
973 
974 static int lance_reset(struct net_device *dev)
975 {
976 	struct lance_private *lp = netdev_priv(dev);
977 	int status;
978 
979 	STOP_LANCE(lp);
980 
981 	/* On the 4m, reset the dma too */
982 	if (lp->dregs) {
983 		u32 csr, addr;
984 
985 		printk(KERN_ERR "resetting ledma\n");
986 		csr = sbus_readl(lp->dregs + DMA_CSR);
987 		sbus_writel(csr | DMA_RST_ENET, lp->dregs + DMA_CSR);
988 		udelay(200);
989 		sbus_writel(csr & ~DMA_RST_ENET, lp->dregs + DMA_CSR);
990 
991 		addr = lp->init_block_dvma & 0xff000000;
992 		sbus_writel(addr, lp->dregs + DMA_TEST);
993 	}
994 	lp->init_ring(dev);
995 	load_csrs(lp);
996 	netif_trans_update(dev); /* prevent tx timeout */
997 	status = init_restart_lance(lp);
998 	return status;
999 }
1000 
1001 static void lance_piocopy_from_skb(void __iomem *dest, unsigned char *src, int len)
1002 {
1003 	void __iomem *piobuf = dest;
1004 	u32 *p32;
1005 	u16 *p16;
1006 	u8 *p8;
1007 
1008 	switch ((unsigned long)src & 0x3) {
1009 	case 0:
1010 		p32 = (u32 *) src;
1011 		while (len >= 4) {
1012 			sbus_writel(*p32, piobuf);
1013 			p32++;
1014 			piobuf += 4;
1015 			len -= 4;
1016 		}
1017 		src = (char *) p32;
1018 		break;
1019 	case 1:
1020 	case 3:
1021 		p8 = (u8 *) src;
1022 		while (len >= 4) {
1023 			u32 val;
1024 
1025 			val  = p8[0] << 24;
1026 			val |= p8[1] << 16;
1027 			val |= p8[2] << 8;
1028 			val |= p8[3];
1029 			sbus_writel(val, piobuf);
1030 			p8 += 4;
1031 			piobuf += 4;
1032 			len -= 4;
1033 		}
1034 		src = (char *) p8;
1035 		break;
1036 	case 2:
1037 		p16 = (u16 *) src;
1038 		while (len >= 4) {
1039 			u32 val = p16[0]<<16 | p16[1];
1040 			sbus_writel(val, piobuf);
1041 			p16 += 2;
1042 			piobuf += 4;
1043 			len -= 4;
1044 		}
1045 		src = (char *) p16;
1046 		break;
1047 	}
1048 	if (len >= 2) {
1049 		u16 val = src[0] << 8 | src[1];
1050 		sbus_writew(val, piobuf);
1051 		src += 2;
1052 		piobuf += 2;
1053 		len -= 2;
1054 	}
1055 	if (len >= 1)
1056 		sbus_writeb(src[0], piobuf);
1057 }
1058 
1059 static void lance_piozero(void __iomem *dest, int len)
1060 {
1061 	void __iomem *piobuf = dest;
1062 
1063 	if ((unsigned long)piobuf & 1) {
1064 		sbus_writeb(0, piobuf);
1065 		piobuf += 1;
1066 		len -= 1;
1067 		if (len == 0)
1068 			return;
1069 	}
1070 	if (len == 1) {
1071 		sbus_writeb(0, piobuf);
1072 		return;
1073 	}
1074 	if ((unsigned long)piobuf & 2) {
1075 		sbus_writew(0, piobuf);
1076 		piobuf += 2;
1077 		len -= 2;
1078 		if (len == 0)
1079 			return;
1080 	}
1081 	while (len >= 4) {
1082 		sbus_writel(0, piobuf);
1083 		piobuf += 4;
1084 		len -= 4;
1085 	}
1086 	if (len >= 2) {
1087 		sbus_writew(0, piobuf);
1088 		piobuf += 2;
1089 		len -= 2;
1090 	}
1091 	if (len >= 1)
1092 		sbus_writeb(0, piobuf);
1093 }
1094 
1095 static void lance_tx_timeout(struct net_device *dev, unsigned int txqueue)
1096 {
1097 	struct lance_private *lp = netdev_priv(dev);
1098 
1099 	printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
1100 	       dev->name, sbus_readw(lp->lregs + RDP));
1101 	lance_reset(dev);
1102 	netif_wake_queue(dev);
1103 }
1104 
1105 static netdev_tx_t lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
1106 {
1107 	struct lance_private *lp = netdev_priv(dev);
1108 	int entry, skblen, len;
1109 
1110 	skblen = skb->len;
1111 
1112 	len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
1113 
1114 	spin_lock_irq(&lp->lock);
1115 
1116 	dev->stats.tx_bytes += len;
1117 
1118 	entry = lp->tx_new & TX_RING_MOD_MASK;
1119 	if (lp->pio_buffer) {
1120 		struct lance_init_block __iomem *ib = lp->init_block_iomem;
1121 		sbus_writew((-len) | 0xf000, &ib->btx_ring[entry].length);
1122 		sbus_writew(0, &ib->btx_ring[entry].misc);
1123 		lance_piocopy_from_skb(&ib->tx_buf[entry][0], skb->data, skblen);
1124 		if (len != skblen)
1125 			lance_piozero(&ib->tx_buf[entry][skblen], len - skblen);
1126 		sbus_writeb(LE_T1_POK | LE_T1_OWN, &ib->btx_ring[entry].tmd1_bits);
1127 	} else {
1128 		struct lance_init_block *ib = lp->init_block_mem;
1129 		ib->btx_ring [entry].length = (-len) | 0xf000;
1130 		ib->btx_ring [entry].misc = 0;
1131 		skb_copy_from_linear_data(skb, &ib->tx_buf [entry][0], skblen);
1132 		if (len != skblen)
1133 			memset((char *) &ib->tx_buf [entry][skblen], 0, len - skblen);
1134 		ib->btx_ring [entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
1135 	}
1136 
1137 	lp->tx_new = TX_NEXT(entry);
1138 
1139 	if (TX_BUFFS_AVAIL <= 0)
1140 		netif_stop_queue(dev);
1141 
1142 	/* Kick the lance: transmit now */
1143 	sbus_writew(LE_C0_INEA | LE_C0_TDMD, lp->lregs + RDP);
1144 
1145 	/* Read back CSR to invalidate the E-Cache.
1146 	 * This is needed, because DMA_DSBL_WR_INV is set.
1147 	 */
1148 	if (lp->dregs)
1149 		sbus_readw(lp->lregs + RDP);
1150 
1151 	spin_unlock_irq(&lp->lock);
1152 
1153 	dev_kfree_skb(skb);
1154 
1155 	return NETDEV_TX_OK;
1156 }
1157 
1158 /* taken from the depca driver */
1159 static void lance_load_multicast(struct net_device *dev)
1160 {
1161 	struct lance_private *lp = netdev_priv(dev);
1162 	struct netdev_hw_addr *ha;
1163 	u32 crc;
1164 	u32 val;
1165 
1166 	/* set all multicast bits */
1167 	if (dev->flags & IFF_ALLMULTI)
1168 		val = ~0;
1169 	else
1170 		val = 0;
1171 
1172 	if (lp->pio_buffer) {
1173 		struct lance_init_block __iomem *ib = lp->init_block_iomem;
1174 		sbus_writel(val, &ib->filter[0]);
1175 		sbus_writel(val, &ib->filter[1]);
1176 	} else {
1177 		struct lance_init_block *ib = lp->init_block_mem;
1178 		ib->filter [0] = val;
1179 		ib->filter [1] = val;
1180 	}
1181 
1182 	if (dev->flags & IFF_ALLMULTI)
1183 		return;
1184 
1185 	/* Add addresses */
1186 	netdev_for_each_mc_addr(ha, dev) {
1187 		crc = ether_crc_le(6, ha->addr);
1188 		crc = crc >> 26;
1189 		if (lp->pio_buffer) {
1190 			struct lance_init_block __iomem *ib = lp->init_block_iomem;
1191 			u16 __iomem *mcast_table = (u16 __iomem *) &ib->filter;
1192 			u16 tmp = sbus_readw(&mcast_table[crc>>4]);
1193 			tmp |= 1 << (crc & 0xf);
1194 			sbus_writew(tmp, &mcast_table[crc>>4]);
1195 		} else {
1196 			struct lance_init_block *ib = lp->init_block_mem;
1197 			u16 *mcast_table = (u16 *) &ib->filter;
1198 			mcast_table [crc >> 4] |= 1 << (crc & 0xf);
1199 		}
1200 	}
1201 }
1202 
1203 static void lance_set_multicast(struct net_device *dev)
1204 {
1205 	struct lance_private *lp = netdev_priv(dev);
1206 	struct lance_init_block *ib_mem = lp->init_block_mem;
1207 	struct lance_init_block __iomem *ib_iomem = lp->init_block_iomem;
1208 	u16 mode;
1209 
1210 	if (!netif_running(dev))
1211 		return;
1212 
1213 	if (lp->tx_old != lp->tx_new) {
1214 		mod_timer(&lp->multicast_timer, jiffies + 4);
1215 		netif_wake_queue(dev);
1216 		return;
1217 	}
1218 
1219 	netif_stop_queue(dev);
1220 
1221 	STOP_LANCE(lp);
1222 	lp->init_ring(dev);
1223 
1224 	if (lp->pio_buffer)
1225 		mode = sbus_readw(&ib_iomem->mode);
1226 	else
1227 		mode = ib_mem->mode;
1228 	if (dev->flags & IFF_PROMISC) {
1229 		mode |= LE_MO_PROM;
1230 		if (lp->pio_buffer)
1231 			sbus_writew(mode, &ib_iomem->mode);
1232 		else
1233 			ib_mem->mode = mode;
1234 	} else {
1235 		mode &= ~LE_MO_PROM;
1236 		if (lp->pio_buffer)
1237 			sbus_writew(mode, &ib_iomem->mode);
1238 		else
1239 			ib_mem->mode = mode;
1240 		lance_load_multicast(dev);
1241 	}
1242 	load_csrs(lp);
1243 	init_restart_lance(lp);
1244 	netif_wake_queue(dev);
1245 }
1246 
1247 static void lance_set_multicast_retry(struct timer_list *t)
1248 {
1249 	struct lance_private *lp = from_timer(lp, t, multicast_timer);
1250 	struct net_device *dev = lp->dev;
1251 
1252 	lance_set_multicast(dev);
1253 }
1254 
1255 static void lance_free_hwresources(struct lance_private *lp)
1256 {
1257 	if (lp->lregs)
1258 		of_iounmap(&lp->op->resource[0], lp->lregs, LANCE_REG_SIZE);
1259 	if (lp->dregs) {
1260 		struct platform_device *ledma = lp->ledma;
1261 
1262 		of_iounmap(&ledma->resource[0], lp->dregs,
1263 			   resource_size(&ledma->resource[0]));
1264 	}
1265 	if (lp->init_block_iomem) {
1266 		of_iounmap(&lp->lebuffer->resource[0], lp->init_block_iomem,
1267 			   sizeof(struct lance_init_block));
1268 	} else if (lp->init_block_mem) {
1269 		dma_free_coherent(&lp->op->dev,
1270 				  sizeof(struct lance_init_block),
1271 				  lp->init_block_mem,
1272 				  lp->init_block_dvma);
1273 	}
1274 }
1275 
1276 /* Ethtool support... */
1277 static void sparc_lance_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1278 {
1279 	strlcpy(info->driver, "sunlance", sizeof(info->driver));
1280 }
1281 
1282 static const struct ethtool_ops sparc_lance_ethtool_ops = {
1283 	.get_drvinfo		= sparc_lance_get_drvinfo,
1284 	.get_link		= ethtool_op_get_link,
1285 };
1286 
1287 static const struct net_device_ops sparc_lance_ops = {
1288 	.ndo_open		= lance_open,
1289 	.ndo_stop		= lance_close,
1290 	.ndo_start_xmit		= lance_start_xmit,
1291 	.ndo_set_rx_mode	= lance_set_multicast,
1292 	.ndo_tx_timeout		= lance_tx_timeout,
1293 	.ndo_set_mac_address	= eth_mac_addr,
1294 	.ndo_validate_addr	= eth_validate_addr,
1295 };
1296 
1297 static int sparc_lance_probe_one(struct platform_device *op,
1298 				 struct platform_device *ledma,
1299 				 struct platform_device *lebuffer)
1300 {
1301 	struct device_node *dp = op->dev.of_node;
1302 	struct lance_private *lp;
1303 	struct net_device *dev;
1304 	int    i;
1305 
1306 	dev = alloc_etherdev(sizeof(struct lance_private) + 8);
1307 	if (!dev)
1308 		return -ENOMEM;
1309 
1310 	lp = netdev_priv(dev);
1311 
1312 	spin_lock_init(&lp->lock);
1313 
1314 	/* Copy the IDPROM ethernet address to the device structure, later we
1315 	 * will copy the address in the device structure to the lance
1316 	 * initialization block.
1317 	 */
1318 	for (i = 0; i < 6; i++)
1319 		dev->dev_addr[i] = idprom->id_ethaddr[i];
1320 
1321 	/* Get the IO region */
1322 	lp->lregs = of_ioremap(&op->resource[0], 0,
1323 			       LANCE_REG_SIZE, lancestr);
1324 	if (!lp->lregs) {
1325 		printk(KERN_ERR "SunLance: Cannot map registers.\n");
1326 		goto fail;
1327 	}
1328 
1329 	lp->ledma = ledma;
1330 	if (lp->ledma) {
1331 		lp->dregs = of_ioremap(&ledma->resource[0], 0,
1332 				       resource_size(&ledma->resource[0]),
1333 				       "ledma");
1334 		if (!lp->dregs) {
1335 			printk(KERN_ERR "SunLance: Cannot map "
1336 			       "ledma registers.\n");
1337 			goto fail;
1338 		}
1339 	}
1340 
1341 	lp->op = op;
1342 	lp->lebuffer = lebuffer;
1343 	if (lebuffer) {
1344 		/* sanity check */
1345 		if (lebuffer->resource[0].start & 7) {
1346 			printk(KERN_ERR "SunLance: ERROR: Rx and Tx rings not on even boundary.\n");
1347 			goto fail;
1348 		}
1349 		lp->init_block_iomem =
1350 			of_ioremap(&lebuffer->resource[0], 0,
1351 				   sizeof(struct lance_init_block), "lebuffer");
1352 		if (!lp->init_block_iomem) {
1353 			printk(KERN_ERR "SunLance: Cannot map PIO buffer.\n");
1354 			goto fail;
1355 		}
1356 		lp->init_block_dvma = 0;
1357 		lp->pio_buffer = 1;
1358 		lp->init_ring = lance_init_ring_pio;
1359 		lp->rx = lance_rx_pio;
1360 		lp->tx = lance_tx_pio;
1361 	} else {
1362 		lp->init_block_mem =
1363 			dma_alloc_coherent(&op->dev,
1364 					   sizeof(struct lance_init_block),
1365 					   &lp->init_block_dvma, GFP_ATOMIC);
1366 		if (!lp->init_block_mem)
1367 			goto fail;
1368 
1369 		lp->pio_buffer = 0;
1370 		lp->init_ring = lance_init_ring_dvma;
1371 		lp->rx = lance_rx_dvma;
1372 		lp->tx = lance_tx_dvma;
1373 	}
1374 	lp->busmaster_regval = of_getintprop_default(dp,  "busmaster-regval",
1375 						     (LE_C3_BSWP |
1376 						      LE_C3_ACON |
1377 						      LE_C3_BCON));
1378 
1379 	lp->name = lancestr;
1380 
1381 	lp->burst_sizes = 0;
1382 	if (lp->ledma) {
1383 		struct device_node *ledma_dp = ledma->dev.of_node;
1384 		struct device_node *sbus_dp;
1385 		unsigned int sbmask;
1386 		const char *prop;
1387 		u32 csr;
1388 
1389 		/* Find burst-size property for ledma */
1390 		lp->burst_sizes = of_getintprop_default(ledma_dp,
1391 							"burst-sizes", 0);
1392 
1393 		/* ledma may be capable of fast bursts, but sbus may not. */
1394 		sbus_dp = ledma_dp->parent;
1395 		sbmask = of_getintprop_default(sbus_dp, "burst-sizes",
1396 					       DMA_BURSTBITS);
1397 		lp->burst_sizes &= sbmask;
1398 
1399 		/* Get the cable-selection property */
1400 		prop = of_get_property(ledma_dp, "cable-selection", NULL);
1401 		if (!prop || prop[0] == '\0') {
1402 			struct device_node *nd;
1403 
1404 			printk(KERN_INFO "SunLance: using "
1405 			       "auto-carrier-detection.\n");
1406 
1407 			nd = of_find_node_by_path("/options");
1408 			if (!nd)
1409 				goto no_link_test;
1410 
1411 			prop = of_get_property(nd, "tpe-link-test?", NULL);
1412 			if (!prop)
1413 				goto node_put;
1414 
1415 			if (strcmp(prop, "true")) {
1416 				printk(KERN_NOTICE "SunLance: warning: overriding option "
1417 				       "'tpe-link-test?'\n");
1418 				printk(KERN_NOTICE "SunLance: warning: mail any problems "
1419 				       "to ecd@skynet.be\n");
1420 				auxio_set_lte(AUXIO_LTE_ON);
1421 			}
1422 node_put:
1423 			of_node_put(nd);
1424 no_link_test:
1425 			lp->auto_select = 1;
1426 			lp->tpe = 0;
1427 		} else if (!strcmp(prop, "aui")) {
1428 			lp->auto_select = 0;
1429 			lp->tpe = 0;
1430 		} else {
1431 			lp->auto_select = 0;
1432 			lp->tpe = 1;
1433 		}
1434 
1435 		/* Reset ledma */
1436 		csr = sbus_readl(lp->dregs + DMA_CSR);
1437 		sbus_writel(csr | DMA_RST_ENET, lp->dregs + DMA_CSR);
1438 		udelay(200);
1439 		sbus_writel(csr & ~DMA_RST_ENET, lp->dregs + DMA_CSR);
1440 	} else
1441 		lp->dregs = NULL;
1442 
1443 	lp->dev = dev;
1444 	SET_NETDEV_DEV(dev, &op->dev);
1445 	dev->watchdog_timeo = 5*HZ;
1446 	dev->ethtool_ops = &sparc_lance_ethtool_ops;
1447 	dev->netdev_ops = &sparc_lance_ops;
1448 
1449 	dev->irq = op->archdata.irqs[0];
1450 
1451 	/* We cannot sleep if the chip is busy during a
1452 	 * multicast list update event, because such events
1453 	 * can occur from interrupts (ex. IPv6).  So we
1454 	 * use a timer to try again later when necessary. -DaveM
1455 	 */
1456 	timer_setup(&lp->multicast_timer, lance_set_multicast_retry, 0);
1457 
1458 	if (register_netdev(dev)) {
1459 		printk(KERN_ERR "SunLance: Cannot register device.\n");
1460 		goto fail;
1461 	}
1462 
1463 	platform_set_drvdata(op, lp);
1464 
1465 	printk(KERN_INFO "%s: LANCE %pM\n",
1466 	       dev->name, dev->dev_addr);
1467 
1468 	return 0;
1469 
1470 fail:
1471 	lance_free_hwresources(lp);
1472 	free_netdev(dev);
1473 	return -ENODEV;
1474 }
1475 
1476 static int sunlance_sbus_probe(struct platform_device *op)
1477 {
1478 	struct platform_device *parent = to_platform_device(op->dev.parent);
1479 	struct device_node *parent_dp = parent->dev.of_node;
1480 	int err;
1481 
1482 	if (of_node_name_eq(parent_dp, "ledma")) {
1483 		err = sparc_lance_probe_one(op, parent, NULL);
1484 	} else if (of_node_name_eq(parent_dp, "lebuffer")) {
1485 		err = sparc_lance_probe_one(op, NULL, parent);
1486 	} else
1487 		err = sparc_lance_probe_one(op, NULL, NULL);
1488 
1489 	return err;
1490 }
1491 
1492 static int sunlance_sbus_remove(struct platform_device *op)
1493 {
1494 	struct lance_private *lp = platform_get_drvdata(op);
1495 	struct net_device *net_dev = lp->dev;
1496 
1497 	unregister_netdev(net_dev);
1498 
1499 	lance_free_hwresources(lp);
1500 
1501 	free_netdev(net_dev);
1502 
1503 	return 0;
1504 }
1505 
1506 static const struct of_device_id sunlance_sbus_match[] = {
1507 	{
1508 		.name = "le",
1509 	},
1510 	{},
1511 };
1512 
1513 MODULE_DEVICE_TABLE(of, sunlance_sbus_match);
1514 
1515 static struct platform_driver sunlance_sbus_driver = {
1516 	.driver = {
1517 		.name = "sunlance",
1518 		.of_match_table = sunlance_sbus_match,
1519 	},
1520 	.probe		= sunlance_sbus_probe,
1521 	.remove		= sunlance_sbus_remove,
1522 };
1523 
1524 module_platform_driver(sunlance_sbus_driver);
1525