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