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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wan / hd64570.c
blob058e4818283891f61a6fda90bed1821d12a47534
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Hitachi SCA HD64570 driver for Linux
4 *
5 * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl>
6 *
7 * Source of information: Hitachi HD64570 SCA User's Manual
8 *
9 * We use the following SCA memory map:
10 *
11 * Packet buffer descriptor rings - starting from winbase or win0base:
12 * rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring
13 * tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring
14 * rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used)
15 * tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used)
16 *
17 * Packet data buffers - starting from winbase + buff_offset:
18 * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers
19 * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers
20 * rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers (if used)
21 * tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers (if used)
22 */
23
24 #include <linux/bitops.h>
25 #include <linux/errno.h>
26 #include <linux/fcntl.h>
27 #include <linux/hdlc.h>
28 #include <linux/in.h>
29 #include <linux/interrupt.h>
30 #include <linux/ioport.h>
31 #include <linux/jiffies.h>
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/netdevice.h>
35 #include <linux/skbuff.h>
36 #include <linux/string.h>
37 #include <linux/types.h>
38 #include <asm/io.h>
39 #include <linux/uaccess.h>
40 #include "hd64570.h"
41
42 #define get_msci(port) (phy_node(port) ? MSCI1_OFFSET : MSCI0_OFFSET)
43 #define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET)
44 #define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET)
45
46 #define SCA_INTR_MSCI(node) (node ? 0x10 : 0x01)
47 #define SCA_INTR_DMAC_RX(node) (node ? 0x20 : 0x02)
48 #define SCA_INTR_DMAC_TX(node) (node ? 0x40 : 0x04)
49
50
51 static inline struct net_device *port_to_dev(port_t *port)
52 {
53 return port->dev;
54 }
55
56 static inline int sca_intr_status(card_t *card)
57 {
58 u8 result = 0;
59 u8 isr0 = sca_in(ISR0, card);
60 u8 isr1 = sca_in(ISR1, card);
61
62 if (isr1 & 0x03) result |= SCA_INTR_DMAC_RX(0);
63 if (isr1 & 0x0C) result |= SCA_INTR_DMAC_TX(0);
64 if (isr1 & 0x30) result |= SCA_INTR_DMAC_RX(1);
65 if (isr1 & 0xC0) result |= SCA_INTR_DMAC_TX(1);
66 if (isr0 & 0x0F) result |= SCA_INTR_MSCI(0);
67 if (isr0 & 0xF0) result |= SCA_INTR_MSCI(1);
68
69 if (!(result & SCA_INTR_DMAC_TX(0)))
70 if (sca_in(DSR_TX(0), card) & DSR_EOM)
71 result |= SCA_INTR_DMAC_TX(0);
72 if (!(result & SCA_INTR_DMAC_TX(1)))
73 if (sca_in(DSR_TX(1), card) & DSR_EOM)
74 result |= SCA_INTR_DMAC_TX(1);
75
76 return result;
77 }
78
79 static inline port_t* dev_to_port(struct net_device *dev)
80 {
81 return dev_to_hdlc(dev)->priv;
82 }
83
84 static inline u16 next_desc(port_t *port, u16 desc, int transmit)
85 {
86 return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers
87 : port_to_card(port)->rx_ring_buffers);
88 }
89
90
91 static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit)
92 {
93 u16 rx_buffs = port_to_card(port)->rx_ring_buffers;
94 u16 tx_buffs = port_to_card(port)->tx_ring_buffers;
95
96 desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc.
97 return log_node(port) * (rx_buffs + tx_buffs) +
98 transmit * rx_buffs + desc;
99 }
100
101
102 static inline u16 desc_offset(port_t *port, u16 desc, int transmit)
103 {
104 /* Descriptor offset always fits in 16 bits */
105 return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc);
106 }
107
108
109 static inline pkt_desc __iomem *desc_address(port_t *port, u16 desc,
110 int transmit)
111 {
112 #ifdef PAGE0_ALWAYS_MAPPED
113 return (pkt_desc __iomem *)(win0base(port_to_card(port))
114 + desc_offset(port, desc, transmit));
115 #else
116 return (pkt_desc __iomem *)(winbase(port_to_card(port))
117 + desc_offset(port, desc, transmit));
118 #endif
119 }
120
121
122 static inline u32 buffer_offset(port_t *port, u16 desc, int transmit)
123 {
124 return port_to_card(port)->buff_offset +
125 desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU;
126 }
127
128
129 static inline void sca_set_carrier(port_t *port)
130 {
131 if (!(sca_in(get_msci(port) + ST3, port_to_card(port)) & ST3_DCD)) {
132 #ifdef DEBUG_LINK
133 printk(KERN_DEBUG "%s: sca_set_carrier on\n",
134 port_to_dev(port)->name);
135 #endif
136 netif_carrier_on(port_to_dev(port));
137 } else {
138 #ifdef DEBUG_LINK
139 printk(KERN_DEBUG "%s: sca_set_carrier off\n",
140 port_to_dev(port)->name);
141 #endif
142 netif_carrier_off(port_to_dev(port));
143 }
144 }
145
146
147 static void sca_init_port(port_t *port)
148 {
149 card_t *card = port_to_card(port);
150 int transmit, i;
151
152 port->rxin = 0;
153 port->txin = 0;
154 port->txlast = 0;
155
156 #ifndef PAGE0_ALWAYS_MAPPED
157 openwin(card, 0);
158 #endif
159
160 for (transmit = 0; transmit < 2; transmit++) {
161 u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
162 u16 buffs = transmit ? card->tx_ring_buffers
163 : card->rx_ring_buffers;
164
165 for (i = 0; i < buffs; i++) {
166 pkt_desc __iomem *desc = desc_address(port, i, transmit);
167 u16 chain_off = desc_offset(port, i + 1, transmit);
168 u32 buff_off = buffer_offset(port, i, transmit);
169
170 writew(chain_off, &desc->cp);
171 writel(buff_off, &desc->bp);
172 writew(0, &desc->len);
173 writeb(0, &desc->stat);
174 }
175
176 /* DMA disable - to halt state */
177 sca_out(0, transmit ? DSR_TX(phy_node(port)) :
178 DSR_RX(phy_node(port)), card);
179 /* software ABORT - to initial state */
180 sca_out(DCR_ABORT, transmit ? DCR_TX(phy_node(port)) :
181 DCR_RX(phy_node(port)), card);
182
183 /* current desc addr */
184 sca_out(0, dmac + CPB, card); /* pointer base */
185 sca_outw(desc_offset(port, 0, transmit), dmac + CDAL, card);
186 if (!transmit)
187 sca_outw(desc_offset(port, buffs - 1, transmit),
188 dmac + EDAL, card);
189 else
190 sca_outw(desc_offset(port, 0, transmit), dmac + EDAL,
191 card);
192
193 /* clear frame end interrupt counter */
194 sca_out(DCR_CLEAR_EOF, transmit ? DCR_TX(phy_node(port)) :
195 DCR_RX(phy_node(port)), card);
196
197 if (!transmit) { /* Receive */
198 /* set buffer length */
199 sca_outw(HDLC_MAX_MRU, dmac + BFLL, card);
200 /* Chain mode, Multi-frame */
201 sca_out(0x14, DMR_RX(phy_node(port)), card);
202 sca_out(DIR_EOME | DIR_BOFE, DIR_RX(phy_node(port)),
203 card);
204 /* DMA enable */
205 sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
206 } else { /* Transmit */
207 /* Chain mode, Multi-frame */
208 sca_out(0x14, DMR_TX(phy_node(port)), card);
209 /* enable underflow interrupts */
210 sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card);
211 }
212 }
213 sca_set_carrier(port);
214 }
215
216
217 #ifdef NEED_SCA_MSCI_INTR
218 /* MSCI interrupt service */
219 static inline void sca_msci_intr(port_t *port)
220 {
221 u16 msci = get_msci(port);
222 card_t* card = port_to_card(port);
223 u8 stat = sca_in(msci + ST1, card); /* read MSCI ST1 status */
224
225 /* Reset MSCI TX underrun and CDCD status bit */
226 sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card);
227
228 if (stat & ST1_UDRN) {
229 /* TX Underrun error detected */
230 port_to_dev(port)->stats.tx_errors++;
231 port_to_dev(port)->stats.tx_fifo_errors++;
232 }
233
234 if (stat & ST1_CDCD)
235 sca_set_carrier(port);
236 }
237 #endif
238
239
240 static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc,
241 u16 rxin)
242 {
243 struct net_device *dev = port_to_dev(port);
244 struct sk_buff *skb;
245 u16 len;
246 u32 buff;
247 u32 maxlen;
248 u8 page;
249
250 len = readw(&desc->len);
251 skb = dev_alloc_skb(len);
252 if (!skb) {
253 dev->stats.rx_dropped++;
254 return;
255 }
256
257 buff = buffer_offset(port, rxin, 0);
258 page = buff / winsize(card);
259 buff = buff % winsize(card);
260 maxlen = winsize(card) - buff;
261
262 openwin(card, page);
263
264 if (len > maxlen) {
265 memcpy_fromio(skb->data, winbase(card) + buff, maxlen);
266 openwin(card, page + 1);
267 memcpy_fromio(skb->data + maxlen, winbase(card), len - maxlen);
268 } else
269 memcpy_fromio(skb->data, winbase(card) + buff, len);
270
271 #ifndef PAGE0_ALWAYS_MAPPED
272 openwin(card, 0); /* select pkt_desc table page back */
273 #endif
274 skb_put(skb, len);
275 #ifdef DEBUG_PKT
276 printk(KERN_DEBUG "%s RX(%i):", dev->name, skb->len);
277 debug_frame(skb);
278 #endif
279 dev->stats.rx_packets++;
280 dev->stats.rx_bytes += skb->len;
281 skb->protocol = hdlc_type_trans(skb, dev);
282 netif_rx(skb);
283 }
284
285
286 /* Receive DMA interrupt service */
287 static inline void sca_rx_intr(port_t *port)
288 {
289 struct net_device *dev = port_to_dev(port);
290 u16 dmac = get_dmac_rx(port);
291 card_t *card = port_to_card(port);
292 u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */
293
294 /* Reset DSR status bits */
295 sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
296 DSR_RX(phy_node(port)), card);
297
298 if (stat & DSR_BOF)
299 /* Dropped one or more frames */
300 dev->stats.rx_over_errors++;
301
302 while (1) {
303 u32 desc_off = desc_offset(port, port->rxin, 0);
304 pkt_desc __iomem *desc;
305 u32 cda = sca_inw(dmac + CDAL, card);
306
307 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
308 break; /* No frame received */
309
310 desc = desc_address(port, port->rxin, 0);
311 stat = readb(&desc->stat);
312 if (!(stat & ST_RX_EOM))
313 port->rxpart = 1; /* partial frame received */
314 else if ((stat & ST_ERROR_MASK) || port->rxpart) {
315 dev->stats.rx_errors++;
316 if (stat & ST_RX_OVERRUN)
317 dev->stats.rx_fifo_errors++;
318 else if ((stat & (ST_RX_SHORT | ST_RX_ABORT |
319 ST_RX_RESBIT)) || port->rxpart)
320 dev->stats.rx_frame_errors++;
321 else if (stat & ST_RX_CRC)
322 dev->stats.rx_crc_errors++;
323 if (stat & ST_RX_EOM)
324 port->rxpart = 0; /* received last fragment */
325 } else
326 sca_rx(card, port, desc, port->rxin);
327
328 /* Set new error descriptor address */
329 sca_outw(desc_off, dmac + EDAL, card);
330 port->rxin = next_desc(port, port->rxin, 0);
331 }
332
333 /* make sure RX DMA is enabled */
334 sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
335 }
336
337
338 /* Transmit DMA interrupt service */
339 static inline void sca_tx_intr(port_t *port)
340 {
341 struct net_device *dev = port_to_dev(port);
342 u16 dmac = get_dmac_tx(port);
343 card_t* card = port_to_card(port);
344 u8 stat;
345
346 spin_lock(&port->lock);
347
348 stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */
349
350 /* Reset DSR status bits */
351 sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
352 DSR_TX(phy_node(port)), card);
353
354 while (1) {
355 pkt_desc __iomem *desc;
356
357 u32 desc_off = desc_offset(port, port->txlast, 1);
358 u32 cda = sca_inw(dmac + CDAL, card);
359 if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
360 break; /* Transmitter is/will_be sending this frame */
361
362 desc = desc_address(port, port->txlast, 1);
363 dev->stats.tx_packets++;
364 dev->stats.tx_bytes += readw(&desc->len);
365 writeb(0, &desc->stat); /* Free descriptor */
366 port->txlast = next_desc(port, port->txlast, 1);
367 }
368
369 netif_wake_queue(dev);
370 spin_unlock(&port->lock);
371 }
372
373
374 static irqreturn_t sca_intr(int irq, void* dev_id)
375 {
376 card_t *card = dev_id;
377 int i;
378 u8 stat;
379 int handled = 0;
380 u8 page = sca_get_page(card);
381
382 while((stat = sca_intr_status(card)) != 0) {
383 handled = 1;
384 for (i = 0; i < 2; i++) {
385 port_t *port = get_port(card, i);
386 if (port) {
387 if (stat & SCA_INTR_MSCI(i))
388 sca_msci_intr(port);
389
390 if (stat & SCA_INTR_DMAC_RX(i))
391 sca_rx_intr(port);
392
393 if (stat & SCA_INTR_DMAC_TX(i))
394 sca_tx_intr(port);
395 }
396 }
397 }
398
399 openwin(card, page); /* Restore original page */
400 return IRQ_RETVAL(handled);
401 }
402
403
404 static void sca_set_port(port_t *port)
405 {
406 card_t* card = port_to_card(port);
407 u16 msci = get_msci(port);
408 u8 md2 = sca_in(msci + MD2, card);
409 unsigned int tmc, br = 10, brv = 1024;
410
411
412 if (port->settings.clock_rate > 0) {
413 /* Try lower br for better accuracy*/
414 do {
415 br--;
416 brv >>= 1; /* brv = 2^9 = 512 max in specs */
417
418 /* Baud Rate = CLOCK_BASE / TMC / 2^BR */
419 tmc = CLOCK_BASE / brv / port->settings.clock_rate;
420 }while (br > 1 && tmc <= 128);
421
422 if (tmc < 1) {
423 tmc = 1;
424 br = 0; /* For baud=CLOCK_BASE we use tmc=1 br=0 */
425 brv = 1;
426 } else if (tmc > 255)
427 tmc = 256; /* tmc=0 means 256 - low baud rates */
428
429 port->settings.clock_rate = CLOCK_BASE / brv / tmc;
430 } else {
431 br = 9; /* Minimum clock rate */
432 tmc = 256; /* 8bit = 0 */
433 port->settings.clock_rate = CLOCK_BASE / (256 * 512);
434 }
435
436 port->rxs = (port->rxs & ~CLK_BRG_MASK) | br;
437 port->txs = (port->txs & ~CLK_BRG_MASK) | br;
438 port->tmc = tmc;
439
440 /* baud divisor - time constant*/
441 sca_out(port->tmc, msci + TMC, card);
442
443 /* Set BRG bits */
444 sca_out(port->rxs, msci + RXS, card);
445 sca_out(port->txs, msci + TXS, card);
446
447 if (port->settings.loopback)
448 md2 |= MD2_LOOPBACK;
449 else
450 md2 &= ~MD2_LOOPBACK;
451
452 sca_out(md2, msci + MD2, card);
453
454 }
455
456
457 static void sca_open(struct net_device *dev)
458 {
459 port_t *port = dev_to_port(dev);
460 card_t* card = port_to_card(port);
461 u16 msci = get_msci(port);
462 u8 md0, md2;
463
464 switch(port->encoding) {
465 case ENCODING_NRZ: md2 = MD2_NRZ; break;
466 case ENCODING_NRZI: md2 = MD2_NRZI; break;
467 case ENCODING_FM_MARK: md2 = MD2_FM_MARK; break;
468 case ENCODING_FM_SPACE: md2 = MD2_FM_SPACE; break;
469 default: md2 = MD2_MANCHESTER;
470 }
471
472 if (port->settings.loopback)
473 md2 |= MD2_LOOPBACK;
474
475 switch(port->parity) {
476 case PARITY_CRC16_PR0: md0 = MD0_HDLC | MD0_CRC_16_0; break;
477 case PARITY_CRC16_PR1: md0 = MD0_HDLC | MD0_CRC_16; break;
478 case PARITY_CRC16_PR0_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU_0; break;
479 case PARITY_CRC16_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU; break;
480 default: md0 = MD0_HDLC | MD0_CRC_NONE;
481 }
482
483 sca_out(CMD_RESET, msci + CMD, card);
484 sca_out(md0, msci + MD0, card);
485 sca_out(0x00, msci + MD1, card); /* no address field check */
486 sca_out(md2, msci + MD2, card);
487 sca_out(0x7E, msci + IDL, card); /* flag character 0x7E */
488 sca_out(CTL_IDLE, msci + CTL, card);
489
490 /* Allow at least 8 bytes before requesting RX DMA operation */
491 /* TX with higher priority and possibly with shorter transfers */
492 sca_out(0x07, msci + RRC, card); /* +1=RXRDY/DMA activation condition*/
493 sca_out(0x10, msci + TRC0, card); /* = TXRDY/DMA activation condition*/
494 sca_out(0x14, msci + TRC1, card); /* +1=TXRDY/DMA deactiv condition */
495
496 /* We're using the following interrupts:
497 - TXINT (DMAC completed all transmisions, underrun or DCD change)
498 - all DMA interrupts
499 */
500 sca_set_carrier(port);
501
502 /* MSCI TX INT and RX INT A IRQ enable */
503 sca_out(IE0_TXINT | IE0_RXINTA, msci + IE0, card);
504 sca_out(IE1_UDRN | IE1_CDCD, msci + IE1, card);
505 sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C),
506 IER0, card); /* TXINT and RXINT */
507 /* enable DMA IRQ */
508 sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F),
509 IER1, card);
510
511 sca_out(port->tmc, msci + TMC, card); /* Restore registers */
512 sca_out(port->rxs, msci + RXS, card);
513 sca_out(port->txs, msci + TXS, card);
514 sca_out(CMD_TX_ENABLE, msci + CMD, card);
515 sca_out(CMD_RX_ENABLE, msci + CMD, card);
516
517 netif_start_queue(dev);
518 }
519
520
521 static void sca_close(struct net_device *dev)
522 {
523 port_t *port = dev_to_port(dev);
524 card_t* card = port_to_card(port);
525
526 /* reset channel */
527 sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port));
528 /* disable MSCI interrupts */
529 sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0),
530 IER0, card);
531 /* disable DMA interrupts */
532 sca_out(sca_in(IER1, card) & (phy_node(port) ? 0x0F : 0xF0),
533 IER1, card);
534
535 netif_stop_queue(dev);
536 }
537
538
539 static int sca_attach(struct net_device *dev, unsigned short encoding,
540 unsigned short parity)
541 {
542 if (encoding != ENCODING_NRZ &&
543 encoding != ENCODING_NRZI &&
544 encoding != ENCODING_FM_MARK &&
545 encoding != ENCODING_FM_SPACE &&
546 encoding != ENCODING_MANCHESTER)
547 return -EINVAL;
548
549 if (parity != PARITY_NONE &&
550 parity != PARITY_CRC16_PR0 &&
551 parity != PARITY_CRC16_PR1 &&
552 parity != PARITY_CRC16_PR0_CCITT &&
553 parity != PARITY_CRC16_PR1_CCITT)
554 return -EINVAL;
555
556 dev_to_port(dev)->encoding = encoding;
557 dev_to_port(dev)->parity = parity;
558 return 0;
559 }
560
561
562 #ifdef DEBUG_RINGS
563 static void sca_dump_rings(struct net_device *dev)
564 {
565 port_t *port = dev_to_port(dev);
566 card_t *card = port_to_card(port);
567 u16 cnt;
568 #ifndef PAGE0_ALWAYS_MAPPED
569 u8 page = sca_get_page(card);
570
571 openwin(card, 0);
572 #endif
573
574 printk(KERN_DEBUG "RX ring: CDA=%u EDA=%u DSR=%02X in=%u %sactive",
575 sca_inw(get_dmac_rx(port) + CDAL, card),
576 sca_inw(get_dmac_rx(port) + EDAL, card),
577 sca_in(DSR_RX(phy_node(port)), card), port->rxin,
578 sca_in(DSR_RX(phy_node(port)), card) & DSR_DE ? "" : "in");
579 for (cnt = 0; cnt < port_to_card(port)->rx_ring_buffers; cnt++)
580 pr_cont(" %02X", readb(&(desc_address(port, cnt, 0)->stat)));
581 pr_cont("\n");
582
583 printk(KERN_DEBUG "TX ring: CDA=%u EDA=%u DSR=%02X in=%u "
584 "last=%u %sactive",
585 sca_inw(get_dmac_tx(port) + CDAL, card),
586 sca_inw(get_dmac_tx(port) + EDAL, card),
587 sca_in(DSR_TX(phy_node(port)), card), port->txin, port->txlast,
588 sca_in(DSR_TX(phy_node(port)), card) & DSR_DE ? "" : "in");
589
590 for (cnt = 0; cnt < port_to_card(port)->tx_ring_buffers; cnt++)
591 pr_cont(" %02X", readb(&(desc_address(port, cnt, 1)->stat)));
592 pr_cont("\n");
593
594 printk(KERN_DEBUG "MSCI: MD: %02x %02x %02x, ST: %02x %02x %02x %02x,"
595 " FST: %02x CST: %02x %02x\n",
596 sca_in(get_msci(port) + MD0, card),
597 sca_in(get_msci(port) + MD1, card),
598 sca_in(get_msci(port) + MD2, card),
599 sca_in(get_msci(port) + ST0, card),
600 sca_in(get_msci(port) + ST1, card),
601 sca_in(get_msci(port) + ST2, card),
602 sca_in(get_msci(port) + ST3, card),
603 sca_in(get_msci(port) + FST, card),
604 sca_in(get_msci(port) + CST0, card),
605 sca_in(get_msci(port) + CST1, card));
606
607 printk(KERN_DEBUG "ISR: %02x %02x %02x\n", sca_in(ISR0, card),
608 sca_in(ISR1, card), sca_in(ISR2, card));
609
610 #ifndef PAGE0_ALWAYS_MAPPED
611 openwin(card, page); /* Restore original page */
612 #endif
613 }
614 #endif /* DEBUG_RINGS */
615
616
617 static netdev_tx_t sca_xmit(struct sk_buff *skb, struct net_device *dev)
618 {
619 port_t *port = dev_to_port(dev);
620 card_t *card = port_to_card(port);
621 pkt_desc __iomem *desc;
622 u32 buff, len;
623 u8 page;
624 u32 maxlen;
625
626 spin_lock_irq(&port->lock);
627
628 desc = desc_address(port, port->txin + 1, 1);
629 BUG_ON(readb(&desc->stat)); /* previous xmit should stop queue */
630
631 #ifdef DEBUG_PKT
632 printk(KERN_DEBUG "%s TX(%i):", dev->name, skb->len);
633 debug_frame(skb);
634 #endif
635
636 desc = desc_address(port, port->txin, 1);
637 buff = buffer_offset(port, port->txin, 1);
638 len = skb->len;
639 page = buff / winsize(card);
640 buff = buff % winsize(card);
641 maxlen = winsize(card) - buff;
642
643 openwin(card, page);
644 if (len > maxlen) {
645 memcpy_toio(winbase(card) + buff, skb->data, maxlen);
646 openwin(card, page + 1);
647 memcpy_toio(winbase(card), skb->data + maxlen, len - maxlen);
648 } else
649 memcpy_toio(winbase(card) + buff, skb->data, len);
650
651 #ifndef PAGE0_ALWAYS_MAPPED
652 openwin(card, 0); /* select pkt_desc table page back */
653 #endif
654 writew(len, &desc->len);
655 writeb(ST_TX_EOM, &desc->stat);
656
657 port->txin = next_desc(port, port->txin, 1);
658 sca_outw(desc_offset(port, port->txin, 1),
659 get_dmac_tx(port) + EDAL, card);
660
661 sca_out(DSR_DE, DSR_TX(phy_node(port)), card); /* Enable TX DMA */
662
663 desc = desc_address(port, port->txin + 1, 1);
664 if (readb(&desc->stat)) /* allow 1 packet gap */
665 netif_stop_queue(dev);
666
667 spin_unlock_irq(&port->lock);
668
669 dev_kfree_skb(skb);
670 return NETDEV_TX_OK;
671 }
672
673
674 #ifdef NEED_DETECT_RAM
675 static u32 sca_detect_ram(card_t *card, u8 __iomem *rambase, u32 ramsize)
676 {
677 /* Round RAM size to 32 bits, fill from end to start */
678 u32 i = ramsize &= ~3;
679 u32 size = winsize(card);
680
681 openwin(card, (i - 4) / size); /* select last window */
682
683 do {
684 i -= 4;
685 if ((i + 4) % size == 0)
686 openwin(card, i / size);
687 writel(i ^ 0x12345678, rambase + i % size);
688 } while (i > 0);
689
690 for (i = 0; i < ramsize ; i += 4) {
691 if (i % size == 0)
692 openwin(card, i / size);
693
694 if (readl(rambase + i % size) != (i ^ 0x12345678))
695 break;
696 }
697
698 return i;
699 }
700 #endif /* NEED_DETECT_RAM */
701
702
703 static void sca_init(card_t *card, int wait_states)
704 {
705 sca_out(wait_states, WCRL, card); /* Wait Control */
706 sca_out(wait_states, WCRM, card);
707 sca_out(wait_states, WCRH, card);
708
709 sca_out(0, DMER, card); /* DMA Master disable */
710 sca_out(0x03, PCR, card); /* DMA priority */
711 sca_out(0, DSR_RX(0), card); /* DMA disable - to halt state */
712 sca_out(0, DSR_TX(0), card);
713 sca_out(0, DSR_RX(1), card);
714 sca_out(0, DSR_TX(1), card);
715 sca_out(DMER_DME, DMER, card); /* DMA Master enable */
716 }
Linux with added FPC-III support