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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / wan / hd64570.c
blob33b67d88fceb312ce013af94af0583e4f9e2f420
1 /*
2 * Hitachi SCA HD64570 driver for Linux
3 *
4 * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License
8 * as published by the Free Software Foundation.
9 *
10 * Source of information: Hitachi HD64570 SCA User's Manual
11 *
12 * We use the following SCA memory map:
13 *
14 * Packet buffer descriptor rings - starting from winbase or win0base:
15 * rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring
16 * tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring
17 * rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used)
18 * tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used)
19 *
20 * Packet data buffers - starting from winbase + buff_offset:
21 * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers
22 * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers
23 * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers (if used)
24 * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers (if used)
25 */
26
27 #include <linux/bitops.h>
28 #include <linux/errno.h>
29 #include <linux/fcntl.h>
30 #include <linux/hdlc.h>
31 #include <linux/in.h>
32 #include <linux/init.h>
33 #include <linux/interrupt.h>
34 #include <linux/ioport.h>
35 #include <linux/jiffies.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/netdevice.h>
39 #include <linux/skbuff.h>
40 #include <linux/string.h>
41 #include <linux/types.h>
42 #include <asm/io.h>
43 #include <asm/system.h>
44 #include <asm/uaccess.h>
45 #include "hd64570.h"
46
47 #define get_msci(port) (phy_node(port) ? MSCI1_OFFSET : MSCI0_OFFSET)
48 #define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET)
49 #define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET)
50
51 #define SCA_INTR_MSCI(node) (node ? 0x10 : 0x01)
52 #define SCA_INTR_DMAC_RX(node) (node ? 0x20 : 0x02)
53 #define SCA_INTR_DMAC_TX(node) (node ? 0x40 : 0x04)
54
55
56 static inline struct net_device *port_to_dev(port_t *port)
57 {
58 return port->dev;
59 }
60
61 static inline int sca_intr_status(card_t *card)
62 {
63 u8 result = 0;
64 u8 isr0 = sca_in(ISR0, card);
65 u8 isr1 = sca_in(ISR1, card);
66
67 if (isr1 & 0x03) result |= SCA_INTR_DMAC_RX(0);
68 if (isr1 & 0x0C) result |= SCA_INTR_DMAC_TX(0);
69 if (isr1 & 0x30) result |= SCA_INTR_DMAC_RX(1);
70 if (isr1 & 0xC0) result |= SCA_INTR_DMAC_TX(1);
71 if (isr0 & 0x0F) result |= SCA_INTR_MSCI(0);
72 if (isr0 & 0xF0) result |= SCA_INTR_MSCI(1);
73
74 if (!(result & SCA_INTR_DMAC_TX(0)))
75 if (sca_in(DSR_TX(0), card) & DSR_EOM)
76 result |= SCA_INTR_DMAC_TX(0);
77 if (!(result & SCA_INTR_DMAC_TX(1)))
78 if (sca_in(DSR_TX(1), card) & DSR_EOM)
79 result |= SCA_INTR_DMAC_TX(1);
80
81 return result;
82 }
83
84 static inline port_t* dev_to_port(struct net_device *dev)
85 {
86 return dev_to_hdlc(dev)->priv;
87 }
88
89 static inline u16 next_desc(port_t *port, u16 desc, int transmit)
90 {
91 return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers
92 : port_to_card(port)->rx_ring_buffers);
93 }
94
95
96 static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit)
97 {
98 u16 rx_buffs = port_to_card(port)->rx_ring_buffers;
99 u16 tx_buffs = port_to_card(port)->tx_ring_buffers;
100
101 desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc.
102 return log_node(port) * (rx_buffs + tx_buffs) +
103 transmit * rx_buffs + desc;
104 }
105
106
107 static inline u16 desc_offset(port_t *port, u16 desc, int transmit)
108 {
109 /* Descriptor offset always fits in 16 bits */
110 return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc);
111 }
112
113
114 static inline pkt_desc __iomem *desc_address(port_t *port, u16 desc,
115 int transmit)
116 {
117 #ifdef PAGE0_ALWAYS_MAPPED
118 return (pkt_desc __iomem *)(win0base(port_to_card(port))
119 + desc_offset(port, desc, transmit));
120 #else
121 return (pkt_desc __iomem *)(winbase(port_to_card(port))
122 + desc_offset(port, desc, transmit));
123 #endif
124 }
125
126
127 static inline u32 buffer_offset(port_t *port, u16 desc, int transmit)
128 {
129 return port_to_card(port)->buff_offset +
130 desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU;
131 }
132
133
134 static inline void sca_set_carrier(port_t *port)
135 {
136 if (!(sca_in(get_msci(port) + ST3, port_to_card(port)) & ST3_DCD)) {
137 #ifdef DEBUG_LINK
138 printk(KERN_DEBUG "%s: sca_set_carrier on\n",
139 port_to_dev(port)->name);
140 #endif
141 netif_carrier_on(port_to_dev(port));
142 } else {
143 #ifdef DEBUG_LINK
144 printk(KERN_DEBUG "%s: sca_set_carrier off\n",
145 port_to_dev(port)->name);
146 #endif
147 netif_carrier_off(port_to_dev(port));
148 }
149 }
150
151
152 static void sca_init_port(port_t *port)
153 {
154 card_t *card = port_to_card(port);
155 int transmit, i;
156
157 port->rxin = 0;
158 port->txin = 0;
159 port->txlast = 0;
160
161 #ifndef PAGE0_ALWAYS_MAPPED
162 openwin(card, 0);
163 #endif
164
165 for (transmit = 0; transmit < 2; transmit++) {
166 u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
167 u16 buffs = transmit ? card->tx_ring_buffers
168 : card->rx_ring_buffers;
169
170 for (i = 0; i < buffs; i++) {
171 pkt_desc __iomem *desc = desc_address(port, i, transmit);
172 u16 chain_off = desc_offset(port, i + 1, transmit);
173 u32 buff_off = buffer_offset(port, i, transmit);
174
175 writew(chain_off, &desc->cp);
176 writel(buff_off, &desc->bp);
177 writew(0, &desc->len);
178 writeb(0, &desc->stat);
179 }
180
181 /* DMA disable - to halt state */
182 sca_out(0, transmit ? DSR_TX(phy_node(port)) :
183 DSR_RX(phy_node(port)), card);
184 /* software ABORT - to initial state */
185 sca_out(DCR_ABORT, transmit ? DCR_TX(phy_node(port)) :
186 DCR_RX(phy_node(port)), card);
187
188 /* current desc addr */
189 sca_out(0, dmac + CPB, card); /* pointer base */
190 sca_outw(desc_offset(port, 0, transmit), dmac + CDAL, card);
191 if (!transmit)
192 sca_outw(desc_offset(port, buffs - 1, transmit),
193 dmac + EDAL, card);
194 else
195 sca_outw(desc_offset(port, 0, transmit), dmac + EDAL,
196 card);
197
198 /* clear frame end interrupt counter */
199 sca_out(DCR_CLEAR_EOF, transmit ? DCR_TX(phy_node(port)) :
200 DCR_RX(phy_node(port)), card);
201
202 if (!transmit) { /* Receive */
203 /* set buffer length */
204 sca_outw(HDLC_MAX_MRU, dmac + BFLL, card);
205 /* Chain mode, Multi-frame */
206 sca_out(0x14, DMR_RX(phy_node(port)), card);
207 sca_out(DIR_EOME | DIR_BOFE, DIR_RX(phy_node(port)),
208 card);
209 /* DMA enable */
210 sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
211 } else { /* Transmit */
212 /* Chain mode, Multi-frame */
213 sca_out(0x14, DMR_TX(phy_node(port)), card);
214 /* enable underflow interrupts */
215 sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card);
216 }
217 }
218 sca_set_carrier(port);
219 }
220
221
222 #ifdef NEED_SCA_MSCI_INTR
223 /* MSCI interrupt service */
224 static inline void sca_msci_intr(port_t *port)
225 {
226 u16 msci = get_msci(port);
227 card_t* card = port_to_card(port);
228 u8 stat = sca_in(msci + ST1, card); /* read MSCI ST1 status */
229
230 /* Reset MSCI TX underrun and CDCD status bit */
231 sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card);
232
233 if (stat & ST1_UDRN) {
234 /* TX Underrun error detected */
235 port_to_dev(port)->stats.tx_errors++;
236 port_to_dev(port)->stats.tx_fifo_errors++;
237 }
238
239 if (stat & ST1_CDCD)
240 sca_set_carrier(port);
241 }
242 #endif
243
244
245 static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc,
246 u16 rxin)
247 {
248 struct net_device *dev = port_to_dev(port);
249 struct sk_buff *skb;
250 u16 len;
251 u32 buff;
252 u32 maxlen;
253 u8 page;
254
255 len = readw(&desc->len);
256 skb = dev_alloc_skb(len);
257 if (!skb) {
258 dev->stats.rx_dropped++;
259 return;
260 }
261
262 buff = buffer_offset(port, rxin, 0);
263 page = buff / winsize(card);
264 buff = buff % winsize(card);
265 maxlen = winsize(card) - buff;
266
267 openwin(card, page);
268
269 if (len > maxlen) {
270 memcpy_fromio(skb->data, winbase(card) + buff, maxlen);
271 openwin(card, page + 1);
272 memcpy_fromio(skb->data + maxlen, winbase(card), len - maxlen);
273 } else
274 memcpy_fromio(skb->data, winbase(card) + buff, len);
275
276 #ifndef PAGE0_ALWAYS_MAPPED
277 openwin(card, 0); /* select pkt_desc table page back */
278 #endif
279 skb_put(skb, len);
280 #ifdef DEBUG_PKT
281 printk(KERN_DEBUG "%s RX(%i):", dev->name, skb->len);
282 debug_frame(skb);
283 #endif
284 dev->stats.rx_packets++;
285 dev->stats.rx_bytes += skb->len;
286 skb->protocol = hdlc_type_trans(skb, dev);
287 netif_rx(skb);
288 }
289
290
291 /* Receive DMA interrupt service */
292 static inline void sca_rx_intr(port_t *port)
293 {
294 struct net_device *dev = port_to_dev(port);
295 u16 dmac = get_dmac_rx(port);
296 card_t *card = port_to_card(port);
297 u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */
298
299 /* Reset DSR status bits */
300 sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
301 DSR_RX(phy_node(port)), card);
302
303 if (stat & DSR_BOF)
304 /* Dropped one or more frames */
305 dev->stats.rx_over_errors++;
306
307 while (1) {
308 u32 desc_off = desc_offset(port, port->rxin, 0);
309 pkt_desc __iomem *desc;
310 u32 cda = sca_inw(dmac + CDAL, card);
311
312 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
313 break; /* No frame received */
314
315 desc = desc_address(port, port->rxin, 0);
316 stat = readb(&desc->stat);
317 if (!(stat & ST_RX_EOM))
318 port->rxpart = 1; /* partial frame received */
319 else if ((stat & ST_ERROR_MASK) || port->rxpart) {
320 dev->stats.rx_errors++;
321 if (stat & ST_RX_OVERRUN)
322 dev->stats.rx_fifo_errors++;
323 else if ((stat & (ST_RX_SHORT | ST_RX_ABORT |
324 ST_RX_RESBIT)) || port->rxpart)
325 dev->stats.rx_frame_errors++;
326 else if (stat & ST_RX_CRC)
327 dev->stats.rx_crc_errors++;
328 if (stat & ST_RX_EOM)
329 port->rxpart = 0; /* received last fragment */
330 } else
331 sca_rx(card, port, desc, port->rxin);
332
333 /* Set new error descriptor address */
334 sca_outw(desc_off, dmac + EDAL, card);
335 port->rxin = next_desc(port, port->rxin, 0);
336 }
337
338 /* make sure RX DMA is enabled */
339 sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
340 }
341
342
343 /* Transmit DMA interrupt service */
344 static inline void sca_tx_intr(port_t *port)
345 {
346 struct net_device *dev = port_to_dev(port);
347 u16 dmac = get_dmac_tx(port);
348 card_t* card = port_to_card(port);
349 u8 stat;
350
351 spin_lock(&port->lock);
352
353 stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */
354
355 /* Reset DSR status bits */
356 sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
357 DSR_TX(phy_node(port)), card);
358
359 while (1) {
360 pkt_desc __iomem *desc;
361
362 u32 desc_off = desc_offset(port, port->txlast, 1);
363 u32 cda = sca_inw(dmac + CDAL, card);
364 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
365 break; /* Transmitter is/will_be sending this frame */
366
367 desc = desc_address(port, port->txlast, 1);
368 dev->stats.tx_packets++;
369 dev->stats.tx_bytes += readw(&desc->len);
370 writeb(0, &desc->stat); /* Free descriptor */
371 port->txlast = next_desc(port, port->txlast, 1);
372 }
373
374 netif_wake_queue(dev);
375 spin_unlock(&port->lock);
376 }
377
378
379 static irqreturn_t sca_intr(int irq, void* dev_id)
380 {
381 card_t *card = dev_id;
382 int i;
383 u8 stat;
384 int handled = 0;
385 u8 page = sca_get_page(card);
386
387 while((stat = sca_intr_status(card)) != 0) {
388 handled = 1;
389 for (i = 0; i < 2; i++) {
390 port_t *port = get_port(card, i);
391 if (port) {
392 if (stat & SCA_INTR_MSCI(i))
393 sca_msci_intr(port);
394
395 if (stat & SCA_INTR_DMAC_RX(i))
396 sca_rx_intr(port);
397
398 if (stat & SCA_INTR_DMAC_TX(i))
399 sca_tx_intr(port);
400 }
401 }
402 }
403
404 openwin(card, page); /* Restore original page */
405 return IRQ_RETVAL(handled);
406 }
407
408
409 static void sca_set_port(port_t *port)
410 {
411 card_t* card = port_to_card(port);
412 u16 msci = get_msci(port);
413 u8 md2 = sca_in(msci + MD2, card);
414 unsigned int tmc, br = 10, brv = 1024;
415
416
417 if (port->settings.clock_rate > 0) {
418 /* Try lower br for better accuracy*/
419 do {
420 br--;
421 brv >>= 1; /* brv = 2^9 = 512 max in specs */
422
423 /* Baud Rate = CLOCK_BASE / TMC / 2^BR */
424 tmc = CLOCK_BASE / brv / port->settings.clock_rate;
425 }while (br > 1 && tmc <= 128);
426
427 if (tmc < 1) {
428 tmc = 1;
429 br = 0; /* For baud=CLOCK_BASE we use tmc=1 br=0 */
430 brv = 1;
431 } else if (tmc > 255)
432 tmc = 256; /* tmc=0 means 256 - low baud rates */
433
434 port->settings.clock_rate = CLOCK_BASE / brv / tmc;
435 } else {
436 br = 9; /* Minimum clock rate */
437 tmc = 256; /* 8bit = 0 */
438 port->settings.clock_rate = CLOCK_BASE / (256 * 512);
439 }
440
441 port->rxs = (port->rxs & ~CLK_BRG_MASK) | br;
442 port->txs = (port->txs & ~CLK_BRG_MASK) | br;
443 port->tmc = tmc;
444
445 /* baud divisor - time constant*/
446 sca_out(port->tmc, msci + TMC, card);
447
448 /* Set BRG bits */
449 sca_out(port->rxs, msci + RXS, card);
450 sca_out(port->txs, msci + TXS, card);
451
452 if (port->settings.loopback)
453 md2 |= MD2_LOOPBACK;
454 else
455 md2 &= ~MD2_LOOPBACK;
456
457 sca_out(md2, msci + MD2, card);
458
459 }
460
461
462 static void sca_open(struct net_device *dev)
463 {
464 port_t *port = dev_to_port(dev);
465 card_t* card = port_to_card(port);
466 u16 msci = get_msci(port);
467 u8 md0, md2;
468
469 switch(port->encoding) {
470 case ENCODING_NRZ: md2 = MD2_NRZ; break;
471 case ENCODING_NRZI: md2 = MD2_NRZI; break;
472 case ENCODING_FM_MARK: md2 = MD2_FM_MARK; break;
473 case ENCODING_FM_SPACE: md2 = MD2_FM_SPACE; break;
474 default: md2 = MD2_MANCHESTER;
475 }
476
477 if (port->settings.loopback)
478 md2 |= MD2_LOOPBACK;
479
480 switch(port->parity) {
481 case PARITY_CRC16_PR0: md0 = MD0_HDLC | MD0_CRC_16_0; break;
482 case PARITY_CRC16_PR1: md0 = MD0_HDLC | MD0_CRC_16; break;
483 case PARITY_CRC16_PR0_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU_0; break;
484 case PARITY_CRC16_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU; break;
485 default: md0 = MD0_HDLC | MD0_CRC_NONE;
486 }
487
488 sca_out(CMD_RESET, msci + CMD, card);
489 sca_out(md0, msci + MD0, card);
490 sca_out(0x00, msci + MD1, card); /* no address field check */
491 sca_out(md2, msci + MD2, card);
492 sca_out(0x7E, msci + IDL, card); /* flag character 0x7E */
493 sca_out(CTL_IDLE, msci + CTL, card);
494
495 /* Allow at least 8 bytes before requesting RX DMA operation */
496 /* TX with higher priority and possibly with shorter transfers */
497 sca_out(0x07, msci + RRC, card); /* +1=RXRDY/DMA activation condition*/
498 sca_out(0x10, msci + TRC0, card); /* = TXRDY/DMA activation condition*/
499 sca_out(0x14, msci + TRC1, card); /* +1=TXRDY/DMA deactiv condition */
500
501 /* We're using the following interrupts:
502 - TXINT (DMAC completed all transmisions, underrun or DCD change)
503 - all DMA interrupts
504 */
505 sca_set_carrier(port);
506
507 /* MSCI TX INT and RX INT A IRQ enable */
508 sca_out(IE0_TXINT | IE0_RXINTA, msci + IE0, card);
509 sca_out(IE1_UDRN | IE1_CDCD, msci + IE1, card);
510 sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C),
511 IER0, card); /* TXINT and RXINT */
512 /* enable DMA IRQ */
513 sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F),
514 IER1, card);
515
516 sca_out(port->tmc, msci + TMC, card); /* Restore registers */
517 sca_out(port->rxs, msci + RXS, card);
518 sca_out(port->txs, msci + TXS, card);
519 sca_out(CMD_TX_ENABLE, msci + CMD, card);
520 sca_out(CMD_RX_ENABLE, msci + CMD, card);
521
522 netif_start_queue(dev);
523 }
524
525
526 static void sca_close(struct net_device *dev)
527 {
528 port_t *port = dev_to_port(dev);
529 card_t* card = port_to_card(port);
530
531 /* reset channel */
532 sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port));
533 /* disable MSCI interrupts */
534 sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0),
535 IER0, card);
536 /* disable DMA interrupts */
537 sca_out(sca_in(IER1, card) & (phy_node(port) ? 0x0F : 0xF0),
538 IER1, card);
539
540 netif_stop_queue(dev);
541 }
542
543
544 static int sca_attach(struct net_device *dev, unsigned short encoding,
545 unsigned short parity)
546 {
547 if (encoding != ENCODING_NRZ &&
548 encoding != ENCODING_NRZI &&
549 encoding != ENCODING_FM_MARK &&
550 encoding != ENCODING_FM_SPACE &&
551 encoding != ENCODING_MANCHESTER)
552 return -EINVAL;
553
554 if (parity != PARITY_NONE &&
555 parity != PARITY_CRC16_PR0 &&
556 parity != PARITY_CRC16_PR1 &&
557 parity != PARITY_CRC16_PR0_CCITT &&
558 parity != PARITY_CRC16_PR1_CCITT)
559 return -EINVAL;
560
561 dev_to_port(dev)->encoding = encoding;
562 dev_to_port(dev)->parity = parity;
563 return 0;
564 }
565
566
567 #ifdef DEBUG_RINGS
568 static void sca_dump_rings(struct net_device *dev)
569 {
570 port_t *port = dev_to_port(dev);
571 card_t *card = port_to_card(port);
572 u16 cnt;
573 #ifndef PAGE0_ALWAYS_MAPPED
574 u8 page = sca_get_page(card);
575
576 openwin(card, 0);
577 #endif
578
579 printk(KERN_DEBUG "RX ring: CDA=%u EDA=%u DSR=%02X in=%u %sactive",
580 sca_inw(get_dmac_rx(port) + CDAL, card),
581 sca_inw(get_dmac_rx(port) + EDAL, card),
582 sca_in(DSR_RX(phy_node(port)), card), port->rxin,
583 sca_in(DSR_RX(phy_node(port)), card) & DSR_DE ? "" : "in");
584 for (cnt = 0; cnt < port_to_card(port)->rx_ring_buffers; cnt++)
585 pr_cont(" %02X", readb(&(desc_address(port, cnt, 0)->stat)));
586 pr_cont("\n");
587
588 printk(KERN_DEBUG "TX ring: CDA=%u EDA=%u DSR=%02X in=%u "
589 "last=%u %sactive",
590 sca_inw(get_dmac_tx(port) + CDAL, card),
591 sca_inw(get_dmac_tx(port) + EDAL, card),
592 sca_in(DSR_TX(phy_node(port)), card), port->txin, port->txlast,
593 sca_in(DSR_TX(phy_node(port)), card) & DSR_DE ? "" : "in");
594
595 for (cnt = 0; cnt < port_to_card(port)->tx_ring_buffers; cnt++)
596 pr_cont(" %02X", readb(&(desc_address(port, cnt, 1)->stat)));
597 pr_cont("\n");
598
599 printk(KERN_DEBUG "MSCI: MD: %02x %02x %02x, ST: %02x %02x %02x %02x,"
600 " FST: %02x CST: %02x %02x\n",
601 sca_in(get_msci(port) + MD0, card),
602 sca_in(get_msci(port) + MD1, card),
603 sca_in(get_msci(port) + MD2, card),
604 sca_in(get_msci(port) + ST0, card),
605 sca_in(get_msci(port) + ST1, card),
606 sca_in(get_msci(port) + ST2, card),
607 sca_in(get_msci(port) + ST3, card),
608 sca_in(get_msci(port) + FST, card),
609 sca_in(get_msci(port) + CST0, card),
610 sca_in(get_msci(port) + CST1, card));
611
612 printk(KERN_DEBUG "ISR: %02x %02x %02x\n", sca_in(ISR0, card),
613 sca_in(ISR1, card), sca_in(ISR2, card));
614
615 #ifndef PAGE0_ALWAYS_MAPPED
616 openwin(card, page); /* Restore original page */
617 #endif
618 }
619 #endif /* DEBUG_RINGS */
620
621
622 static netdev_tx_t sca_xmit(struct sk_buff *skb, struct net_device *dev)
623 {
624 port_t *port = dev_to_port(dev);
625 card_t *card = port_to_card(port);
626 pkt_desc __iomem *desc;
627 u32 buff, len;
628 u8 page;
629 u32 maxlen;
630
631 spin_lock_irq(&port->lock);
632
633 desc = desc_address(port, port->txin + 1, 1);
634 BUG_ON(readb(&desc->stat)); /* previous xmit should stop queue */
635
636 #ifdef DEBUG_PKT
637 printk(KERN_DEBUG "%s TX(%i):", dev->name, skb->len);
638 debug_frame(skb);
639 #endif
640
641 desc = desc_address(port, port->txin, 1);
642 buff = buffer_offset(port, port->txin, 1);
643 len = skb->len;
644 page = buff / winsize(card);
645 buff = buff % winsize(card);
646 maxlen = winsize(card) - buff;
647
648 openwin(card, page);
649 if (len > maxlen) {
650 memcpy_toio(winbase(card) + buff, skb->data, maxlen);
651 openwin(card, page + 1);
652 memcpy_toio(winbase(card), skb->data + maxlen, len - maxlen);
653 } else
654 memcpy_toio(winbase(card) + buff, skb->data, len);
655
656 #ifndef PAGE0_ALWAYS_MAPPED
657 openwin(card, 0); /* select pkt_desc table page back */
658 #endif
659 writew(len, &desc->len);
660 writeb(ST_TX_EOM, &desc->stat);
661
662 port->txin = next_desc(port, port->txin, 1);
663 sca_outw(desc_offset(port, port->txin, 1),
664 get_dmac_tx(port) + EDAL, card);
665
666 sca_out(DSR_DE, DSR_TX(phy_node(port)), card); /* Enable TX DMA */
667
668 desc = desc_address(port, port->txin + 1, 1);
669 if (readb(&desc->stat)) /* allow 1 packet gap */
670 netif_stop_queue(dev);
671
672 spin_unlock_irq(&port->lock);
673
674 dev_kfree_skb(skb);
675 return NETDEV_TX_OK;
676 }
677
678
679 #ifdef NEED_DETECT_RAM
680 static u32 __devinit sca_detect_ram(card_t *card, u8 __iomem *rambase,
681 u32 ramsize)
682 {
683 /* Round RAM size to 32 bits, fill from end to start */
684 u32 i = ramsize &= ~3;
685 u32 size = winsize(card);
686
687 openwin(card, (i - 4) / size); /* select last window */
688
689 do {
690 i -= 4;
691 if ((i + 4) % size == 0)
692 openwin(card, i / size);
693 writel(i ^ 0x12345678, rambase + i % size);
694 } while (i > 0);
695
696 for (i = 0; i < ramsize ; i += 4) {
697 if (i % size == 0)
698 openwin(card, i / size);
699
700 if (readl(rambase + i % size) != (i ^ 0x12345678))
701 break;
702 }
703
704 return i;
705 }
706 #endif /* NEED_DETECT_RAM */
707
708
709 static void __devinit sca_init(card_t *card, int wait_states)
710 {
711 sca_out(wait_states, WCRL, card); /* Wait Control */
712 sca_out(wait_states, WCRM, card);
713 sca_out(wait_states, WCRH, card);
714
715 sca_out(0, DMER, card); /* DMA Master disable */
716 sca_out(0x03, PCR, card); /* DMA priority */
717 sca_out(0, DSR_RX(0), card); /* DMA disable - to halt state */
718 sca_out(0, DSR_TX(0), card);
719 sca_out(0, DSR_RX(1), card);
720 sca_out(0, DSR_TX(1), card);
721 sca_out(DMER_DME, DMER, card); /* DMA Master enable */
722 }