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Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / net / irda / w83977af_ir.c
blob4212657fa4f976900f498d813d3cc60363f3815b
1 /*********************************************************************
2 *
3 * Filename: w83977af_ir.c
4 * Version: 1.0
5 * Description: FIR driver for the Winbond W83977AF Super I/O chip
6 * Status: Experimental.
7 * Author: Paul VanderSpek
8 * Created at: Wed Nov 4 11:46:16 1998
9 * Modified at: Fri Jan 28 12:10:59 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>
13 * Copyright (c) 1998-1999 Rebel.com
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * Neither Paul VanderSpek nor Rebel.com admit liability nor provide
21 * warranty for any of this software. This material is provided "AS-IS"
22 * and at no charge.
23 *
24 * If you find bugs in this file, its very likely that the same bug
25 * will also be in pc87108.c since the implementations are quite
26 * similar.
27 *
28 * Notice that all functions that needs to access the chip in _any_
29 * way, must save BSR register on entry, and restore it on exit.
30 * It is _very_ important to follow this policy!
31 *
32 * __u8 bank;
33 *
34 * bank = inb( iobase+BSR);
35 *
36 * do_your_stuff_here();
37 *
38 * outb( bank, iobase+BSR);
39 *
40 ********************************************************************/
41
42 #include <linux/module.h>
43 #include <linux/kernel.h>
44 #include <linux/types.h>
45 #include <linux/skbuff.h>
46 #include <linux/netdevice.h>
47 #include <linux/ioport.h>
48 #include <linux/delay.h>
49 #include <linux/slab.h>
50 #include <linux/init.h>
51 #include <linux/rtnetlink.h>
52 #include <linux/dma-mapping.h>
53
54 #include <asm/io.h>
55 #include <asm/dma.h>
56 #include <asm/byteorder.h>
57
58 #include <net/irda/irda.h>
59 #include <net/irda/wrapper.h>
60 #include <net/irda/irda_device.h>
61 #include "w83977af.h"
62 #include "w83977af_ir.h"
63
64 #ifdef CONFIG_ARCH_NETWINDER /* Adjust to NetWinder differences */
65 #undef CONFIG_NETWINDER_TX_DMA_PROBLEMS /* Not needed */
66 #define CONFIG_NETWINDER_RX_DMA_PROBLEMS /* Must have this one! */
67 #endif
68 #undef CONFIG_USE_INTERNAL_TIMER /* Just cannot make that timer work */
69 #define CONFIG_USE_W977_PNP /* Currently needed */
70 #define PIO_MAX_SPEED 115200
71
72 static char *driver_name = "w83977af_ir";
73 static int qos_mtt_bits = 0x07; /* 1 ms or more */
74
75 #define CHIP_IO_EXTENT 8
76
77 static unsigned int io[] = { 0x180, ~0, ~0, ~0 };
78 #ifdef CONFIG_ARCH_NETWINDER /* Adjust to NetWinder differences */
79 static unsigned int irq[] = { 6, 0, 0, 0 };
80 #else
81 static unsigned int irq[] = { 11, 0, 0, 0 };
82 #endif
83 static unsigned int dma[] = { 1, 0, 0, 0 };
84 static unsigned int efbase[] = { W977_EFIO_BASE, W977_EFIO2_BASE };
85 static unsigned int efio = W977_EFIO_BASE;
86
87 static struct w83977af_ir *dev_self[] = { NULL, NULL, NULL, NULL};
88
89 /* Some prototypes */
90 static int w83977af_open(int i, unsigned int iobase, unsigned int irq,
91 unsigned int dma);
92 static int w83977af_close(struct w83977af_ir *self);
93 static int w83977af_probe(int iobase, int irq, int dma);
94 static int w83977af_dma_receive(struct w83977af_ir *self);
95 static int w83977af_dma_receive_complete(struct w83977af_ir *self);
96 static int w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev);
97 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
98 static void w83977af_dma_write(struct w83977af_ir *self, int iobase);
99 static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed);
100 static int w83977af_is_receiving(struct w83977af_ir *self);
101
102 static int w83977af_net_open(struct net_device *dev);
103 static int w83977af_net_close(struct net_device *dev);
104 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
105 static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev);
106
107 /*
108 * Function w83977af_init ()
109 *
110 * Initialize chip. Just try to find out how many chips we are dealing with
111 * and where they are
112 */
113 static int __init w83977af_init(void)
114 {
115 int i;
116
117 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
118
119 for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
120 if (w83977af_open(i, io[i], irq[i], dma[i]) == 0)
121 return 0;
122 }
123 return -ENODEV;
124 }
125
126 /*
127 * Function w83977af_cleanup ()
128 *
129 * Close all configured chips
130 *
131 */
132 static void __exit w83977af_cleanup(void)
133 {
134 int i;
135
136 IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
137
138 for (i=0; i < ARRAY_SIZE(dev_self); i++) {
139 if (dev_self[i])
140 w83977af_close(dev_self[i]);
141 }
142 }
143
144 /*
145 * Function w83977af_open (iobase, irq)
146 *
147 * Open driver instance
148 *
149 */
150 int w83977af_open(int i, unsigned int iobase, unsigned int irq,
151 unsigned int dma)
152 {
153 struct net_device *dev;
154 struct w83977af_ir *self;
155 int err;
156
157 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
158
159 /* Lock the port that we need */
160 if (!request_region(iobase, CHIP_IO_EXTENT, driver_name)) {
161 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
162 __FUNCTION__ , iobase);
163 return -ENODEV;
164 }
165
166 if (w83977af_probe(iobase, irq, dma) == -1) {
167 err = -1;
168 goto err_out;
169 }
170 /*
171 * Allocate new instance of the driver
172 */
173 dev = alloc_irdadev(sizeof(struct w83977af_ir));
174 if (dev == NULL) {
175 printk( KERN_ERR "IrDA: Can't allocate memory for "
176 "IrDA control block!\n");
177 err = -ENOMEM;
178 goto err_out;
179 }
180
181 self = dev->priv;
182 spin_lock_init(&self->lock);
183
184
185 /* Initialize IO */
186 self->io.fir_base = iobase;
187 self->io.irq = irq;
188 self->io.fir_ext = CHIP_IO_EXTENT;
189 self->io.dma = dma;
190 self->io.fifo_size = 32;
191
192 /* Initialize QoS for this device */
193 irda_init_max_qos_capabilies(&self->qos);
194
195 /* The only value we must override it the baudrate */
196
197 /* FIXME: The HP HDLS-1100 does not support 1152000! */
198 self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
199 IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);
200
201 /* The HP HDLS-1100 needs 1 ms according to the specs */
202 self->qos.min_turn_time.bits = qos_mtt_bits;
203 irda_qos_bits_to_value(&self->qos);
204
205 /* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
206 self->rx_buff.truesize = 14384;
207 self->tx_buff.truesize = 4000;
208
209 /* Allocate memory if needed */
210 self->rx_buff.head =
211 dma_alloc_coherent(NULL, self->rx_buff.truesize,
212 &self->rx_buff_dma, GFP_KERNEL);
213 if (self->rx_buff.head == NULL) {
214 err = -ENOMEM;
215 goto err_out1;
216 }
217
218 memset(self->rx_buff.head, 0, self->rx_buff.truesize);
219
220 self->tx_buff.head =
221 dma_alloc_coherent(NULL, self->tx_buff.truesize,
222 &self->tx_buff_dma, GFP_KERNEL);
223 if (self->tx_buff.head == NULL) {
224 err = -ENOMEM;
225 goto err_out2;
226 }
227 memset(self->tx_buff.head, 0, self->tx_buff.truesize);
228
229 self->rx_buff.in_frame = FALSE;
230 self->rx_buff.state = OUTSIDE_FRAME;
231 self->tx_buff.data = self->tx_buff.head;
232 self->rx_buff.data = self->rx_buff.head;
233 self->netdev = dev;
234
235 /* Keep track of module usage */
236 SET_MODULE_OWNER(dev);
237
238 /* Override the network functions we need to use */
239 dev->hard_start_xmit = w83977af_hard_xmit;
240 dev->open = w83977af_net_open;
241 dev->stop = w83977af_net_close;
242 dev->do_ioctl = w83977af_net_ioctl;
243 dev->get_stats = w83977af_net_get_stats;
244
245 err = register_netdev(dev);
246 if (err) {
247 IRDA_ERROR("%s(), register_netdevice() failed!\n", __FUNCTION__);
248 goto err_out3;
249 }
250 IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
251
252 /* Need to store self somewhere */
253 dev_self[i] = self;
254
255 return 0;
256 err_out3:
257 dma_free_coherent(NULL, self->tx_buff.truesize,
258 self->tx_buff.head, self->tx_buff_dma);
259 err_out2:
260 dma_free_coherent(NULL, self->rx_buff.truesize,
261 self->rx_buff.head, self->rx_buff_dma);
262 err_out1:
263 free_netdev(dev);
264 err_out:
265 release_region(iobase, CHIP_IO_EXTENT);
266 return err;
267 }
268
269 /*
270 * Function w83977af_close (self)
271 *
272 * Close driver instance
273 *
274 */
275 static int w83977af_close(struct w83977af_ir *self)
276 {
277 int iobase;
278
279 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
280
281 iobase = self->io.fir_base;
282
283 #ifdef CONFIG_USE_W977_PNP
284 /* enter PnP configuration mode */
285 w977_efm_enter(efio);
286
287 w977_select_device(W977_DEVICE_IR, efio);
288
289 /* Deactivate device */
290 w977_write_reg(0x30, 0x00, efio);
291
292 w977_efm_exit(efio);
293 #endif /* CONFIG_USE_W977_PNP */
294
295 /* Remove netdevice */
296 unregister_netdev(self->netdev);
297
298 /* Release the PORT that this driver is using */
299 IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
300 __FUNCTION__ , self->io.fir_base);
301 release_region(self->io.fir_base, self->io.fir_ext);
302
303 if (self->tx_buff.head)
304 dma_free_coherent(NULL, self->tx_buff.truesize,
305 self->tx_buff.head, self->tx_buff_dma);
306
307 if (self->rx_buff.head)
308 dma_free_coherent(NULL, self->rx_buff.truesize,
309 self->rx_buff.head, self->rx_buff_dma);
310
311 free_netdev(self->netdev);
312
313 return 0;
314 }
315
316 int w83977af_probe( int iobase, int irq, int dma)
317 {
318 int version;
319 int i;
320
321 for (i=0; i < 2; i++) {
322 IRDA_DEBUG( 0, "%s()\n", __FUNCTION__ );
323 #ifdef CONFIG_USE_W977_PNP
324 /* Enter PnP configuration mode */
325 w977_efm_enter(efbase[i]);
326
327 w977_select_device(W977_DEVICE_IR, efbase[i]);
328
329 /* Configure PnP port, IRQ, and DMA channel */
330 w977_write_reg(0x60, (iobase >> 8) & 0xff, efbase[i]);
331 w977_write_reg(0x61, (iobase) & 0xff, efbase[i]);
332
333 w977_write_reg(0x70, irq, efbase[i]);
334 #ifdef CONFIG_ARCH_NETWINDER
335 /* Netwinder uses 1 higher than Linux */
336 w977_write_reg(0x74, dma+1, efbase[i]);
337 #else
338 w977_write_reg(0x74, dma, efbase[i]);
339 #endif /*CONFIG_ARCH_NETWINDER */
340 w977_write_reg(0x75, 0x04, efbase[i]); /* Disable Tx DMA */
341
342 /* Set append hardware CRC, enable IR bank selection */
343 w977_write_reg(0xf0, APEDCRC|ENBNKSEL, efbase[i]);
344
345 /* Activate device */
346 w977_write_reg(0x30, 0x01, efbase[i]);
347
348 w977_efm_exit(efbase[i]);
349 #endif /* CONFIG_USE_W977_PNP */
350 /* Disable Advanced mode */
351 switch_bank(iobase, SET2);
352 outb(iobase+2, 0x00);
353
354 /* Turn on UART (global) interrupts */
355 switch_bank(iobase, SET0);
356 outb(HCR_EN_IRQ, iobase+HCR);
357
358 /* Switch to advanced mode */
359 switch_bank(iobase, SET2);
360 outb(inb(iobase+ADCR1) | ADCR1_ADV_SL, iobase+ADCR1);
361
362 /* Set default IR-mode */
363 switch_bank(iobase, SET0);
364 outb(HCR_SIR, iobase+HCR);
365
366 /* Read the Advanced IR ID */
367 switch_bank(iobase, SET3);
368 version = inb(iobase+AUID);
369
370 /* Should be 0x1? */
371 if (0x10 == (version & 0xf0)) {
372 efio = efbase[i];
373
374 /* Set FIFO size to 32 */
375 switch_bank(iobase, SET2);
376 outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
377
378 /* Set FIFO threshold to TX17, RX16 */
379 switch_bank(iobase, SET0);
380 outb(UFR_RXTL|UFR_TXTL|UFR_TXF_RST|UFR_RXF_RST|
381 UFR_EN_FIFO,iobase+UFR);
382
383 /* Receiver frame length */
384 switch_bank(iobase, SET4);
385 outb(2048 & 0xff, iobase+6);
386 outb((2048 >> 8) & 0x1f, iobase+7);
387
388 /*
389 * Init HP HSDL-1100 transceiver.
390 *
391 * Set IRX_MSL since we have 2 * receive paths IRRX,
392 * and IRRXH. Clear IRSL0D since we want IRSL0 * to
393 * be a input pin used for IRRXH
394 *
395 * IRRX pin 37 connected to receiver
396 * IRTX pin 38 connected to transmitter
397 * FIRRX pin 39 connected to receiver (IRSL0)
398 * CIRRX pin 40 connected to pin 37
399 */
400 switch_bank(iobase, SET7);
401 outb(0x40, iobase+7);
402
403 IRDA_MESSAGE("W83977AF (IR) driver loaded. "
404 "Version: 0x%02x\n", version);
405
406 return 0;
407 } else {
408 /* Try next extented function register address */
409 IRDA_DEBUG( 0, "%s(), Wrong chip version", __FUNCTION__ );
410 }
411 }
412 return -1;
413 }
414
415 void w83977af_change_speed(struct w83977af_ir *self, __u32 speed)
416 {
417 int ir_mode = HCR_SIR;
418 int iobase;
419 __u8 set;
420
421 iobase = self->io.fir_base;
422
423 /* Update accounting for new speed */
424 self->io.speed = speed;
425
426 /* Save current bank */
427 set = inb(iobase+SSR);
428
429 /* Disable interrupts */
430 switch_bank(iobase, SET0);
431 outb(0, iobase+ICR);
432
433 /* Select Set 2 */
434 switch_bank(iobase, SET2);
435 outb(0x00, iobase+ABHL);
436
437 switch (speed) {
438 case 9600: outb(0x0c, iobase+ABLL); break;
439 case 19200: outb(0x06, iobase+ABLL); break;
440 case 38400: outb(0x03, iobase+ABLL); break;
441 case 57600: outb(0x02, iobase+ABLL); break;
442 case 115200: outb(0x01, iobase+ABLL); break;
443 case 576000:
444 ir_mode = HCR_MIR_576;
445 IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __FUNCTION__ );
446 break;
447 case 1152000:
448 ir_mode = HCR_MIR_1152;
449 IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __FUNCTION__ );
450 break;
451 case 4000000:
452 ir_mode = HCR_FIR;
453 IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __FUNCTION__ );
454 break;
455 default:
456 ir_mode = HCR_FIR;
457 IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n", __FUNCTION__ , speed);
458 break;
459 }
460
461 /* Set speed mode */
462 switch_bank(iobase, SET0);
463 outb(ir_mode, iobase+HCR);
464
465 /* set FIFO size to 32 */
466 switch_bank(iobase, SET2);
467 outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
468
469 /* set FIFO threshold to TX17, RX16 */
470 switch_bank(iobase, SET0);
471 outb(0x00, iobase+UFR); /* Reset */
472 outb(UFR_EN_FIFO, iobase+UFR); /* First we must enable FIFO */
473 outb(0xa7, iobase+UFR);
474
475 netif_wake_queue(self->netdev);
476
477 /* Enable some interrupts so we can receive frames */
478 switch_bank(iobase, SET0);
479 if (speed > PIO_MAX_SPEED) {
480 outb(ICR_EFSFI, iobase+ICR);
481 w83977af_dma_receive(self);
482 } else
483 outb(ICR_ERBRI, iobase+ICR);
484
485 /* Restore SSR */
486 outb(set, iobase+SSR);
487 }
488
489 /*
490 * Function w83977af_hard_xmit (skb, dev)
491 *
492 * Sets up a DMA transfer to send the current frame.
493 *
494 */
495 int w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev)
496 {
497 struct w83977af_ir *self;
498 __s32 speed;
499 int iobase;
500 __u8 set;
501 int mtt;
502
503 self = (struct w83977af_ir *) dev->priv;
504
505 iobase = self->io.fir_base;
506
507 IRDA_DEBUG(4, "%s(%ld), skb->len=%d\n", __FUNCTION__ , jiffies,
508 (int) skb->len);
509
510 /* Lock transmit buffer */
511 netif_stop_queue(dev);
512
513 /* Check if we need to change the speed */
514 speed = irda_get_next_speed(skb);
515 if ((speed != self->io.speed) && (speed != -1)) {
516 /* Check for empty frame */
517 if (!skb->len) {
518 w83977af_change_speed(self, speed);
519 dev->trans_start = jiffies;
520 dev_kfree_skb(skb);
521 return 0;
522 } else
523 self->new_speed = speed;
524 }
525
526 /* Save current set */
527 set = inb(iobase+SSR);
528
529 /* Decide if we should use PIO or DMA transfer */
530 if (self->io.speed > PIO_MAX_SPEED) {
531 self->tx_buff.data = self->tx_buff.head;
532 memcpy(self->tx_buff.data, skb->data, skb->len);
533 self->tx_buff.len = skb->len;
534
535 mtt = irda_get_mtt(skb);
536 #ifdef CONFIG_USE_INTERNAL_TIMER
537 if (mtt > 50) {
538 /* Adjust for timer resolution */
539 mtt /= 1000+1;
540
541 /* Setup timer */
542 switch_bank(iobase, SET4);
543 outb(mtt & 0xff, iobase+TMRL);
544 outb((mtt >> 8) & 0x0f, iobase+TMRH);
545
546 /* Start timer */
547 outb(IR_MSL_EN_TMR, iobase+IR_MSL);
548 self->io.direction = IO_XMIT;
549
550 /* Enable timer interrupt */
551 switch_bank(iobase, SET0);
552 outb(ICR_ETMRI, iobase+ICR);
553 } else {
554 #endif
555 IRDA_DEBUG(4, "%s(%ld), mtt=%d\n", __FUNCTION__ , jiffies, mtt);
556 if (mtt)
557 udelay(mtt);
558
559 /* Enable DMA interrupt */
560 switch_bank(iobase, SET0);
561 outb(ICR_EDMAI, iobase+ICR);
562 w83977af_dma_write(self, iobase);
563 #ifdef CONFIG_USE_INTERNAL_TIMER
564 }
565 #endif
566 } else {
567 self->tx_buff.data = self->tx_buff.head;
568 self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
569 self->tx_buff.truesize);
570
571 /* Add interrupt on tx low level (will fire immediately) */
572 switch_bank(iobase, SET0);
573 outb(ICR_ETXTHI, iobase+ICR);
574 }
575 dev->trans_start = jiffies;
576 dev_kfree_skb(skb);
577
578 /* Restore set register */
579 outb(set, iobase+SSR);
580
581 return 0;
582 }
583
584 /*
585 * Function w83977af_dma_write (self, iobase)
586 *
587 * Send frame using DMA
588 *
589 */
590 static void w83977af_dma_write(struct w83977af_ir *self, int iobase)
591 {
592 __u8 set;
593 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
594 unsigned long flags;
595 __u8 hcr;
596 #endif
597 IRDA_DEBUG(4, "%s(), len=%d\n", __FUNCTION__ , self->tx_buff.len);
598
599 /* Save current set */
600 set = inb(iobase+SSR);
601
602 /* Disable DMA */
603 switch_bank(iobase, SET0);
604 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
605
606 /* Choose transmit DMA channel */
607 switch_bank(iobase, SET2);
608 outb(ADCR1_D_CHSW|/*ADCR1_DMA_F|*/ADCR1_ADV_SL, iobase+ADCR1);
609 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
610 spin_lock_irqsave(&self->lock, flags);
611
612 disable_dma(self->io.dma);
613 clear_dma_ff(self->io.dma);
614 set_dma_mode(self->io.dma, DMA_MODE_READ);
615 set_dma_addr(self->io.dma, self->tx_buff_dma);
616 set_dma_count(self->io.dma, self->tx_buff.len);
617 #else
618 irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
619 DMA_MODE_WRITE);
620 #endif
621 self->io.direction = IO_XMIT;
622
623 /* Enable DMA */
624 switch_bank(iobase, SET0);
625 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
626 hcr = inb(iobase+HCR);
627 outb(hcr | HCR_EN_DMA, iobase+HCR);
628 enable_dma(self->io.dma);
629 spin_unlock_irqrestore(&self->lock, flags);
630 #else
631 outb(inb(iobase+HCR) | HCR_EN_DMA | HCR_TX_WT, iobase+HCR);
632 #endif
633
634 /* Restore set register */
635 outb(set, iobase+SSR);
636 }
637
638 /*
639 * Function w83977af_pio_write (iobase, buf, len, fifo_size)
640 *
641 *
642 *
643 */
644 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
645 {
646 int actual = 0;
647 __u8 set;
648
649 IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
650
651 /* Save current bank */
652 set = inb(iobase+SSR);
653
654 switch_bank(iobase, SET0);
655 if (!(inb_p(iobase+USR) & USR_TSRE)) {
656 IRDA_DEBUG(4,
657 "%s(), warning, FIFO not empty yet!\n", __FUNCTION__ );
658
659 fifo_size -= 17;
660 IRDA_DEBUG(4, "%s(), %d bytes left in tx fifo\n",
661 __FUNCTION__ , fifo_size);
662 }
663
664 /* Fill FIFO with current frame */
665 while ((fifo_size-- > 0) && (actual < len)) {
666 /* Transmit next byte */
667 outb(buf[actual++], iobase+TBR);
668 }
669
670 IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n",
671 __FUNCTION__ , fifo_size, actual, len);
672
673 /* Restore bank */
674 outb(set, iobase+SSR);
675
676 return actual;
677 }
678
679 /*
680 * Function w83977af_dma_xmit_complete (self)
681 *
682 * The transfer of a frame in finished. So do the necessary things
683 *
684 *
685 */
686 static void w83977af_dma_xmit_complete(struct w83977af_ir *self)
687 {
688 int iobase;
689 __u8 set;
690
691 IRDA_DEBUG(4, "%s(%ld)\n", __FUNCTION__ , jiffies);
692
693 IRDA_ASSERT(self != NULL, return;);
694
695 iobase = self->io.fir_base;
696
697 /* Save current set */
698 set = inb(iobase+SSR);
699
700 /* Disable DMA */
701 switch_bank(iobase, SET0);
702 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
703
704 /* Check for underrrun! */
705 if (inb(iobase+AUDR) & AUDR_UNDR) {
706 IRDA_DEBUG(0, "%s(), Transmit underrun!\n", __FUNCTION__ );
707
708 self->stats.tx_errors++;
709 self->stats.tx_fifo_errors++;
710
711 /* Clear bit, by writing 1 to it */
712 outb(AUDR_UNDR, iobase+AUDR);
713 } else
714 self->stats.tx_packets++;
715
716
717 if (self->new_speed) {
718 w83977af_change_speed(self, self->new_speed);
719 self->new_speed = 0;
720 }
721
722 /* Unlock tx_buff and request another frame */
723 /* Tell the network layer, that we want more frames */
724 netif_wake_queue(self->netdev);
725
726 /* Restore set */
727 outb(set, iobase+SSR);
728 }
729
730 /*
731 * Function w83977af_dma_receive (self)
732 *
733 * Get ready for receiving a frame. The device will initiate a DMA
734 * if it starts to receive a frame.
735 *
736 */
737 int w83977af_dma_receive(struct w83977af_ir *self)
738 {
739 int iobase;
740 __u8 set;
741 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
742 unsigned long flags;
743 __u8 hcr;
744 #endif
745 IRDA_ASSERT(self != NULL, return -1;);
746
747 IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
748
749 iobase= self->io.fir_base;
750
751 /* Save current set */
752 set = inb(iobase+SSR);
753
754 /* Disable DMA */
755 switch_bank(iobase, SET0);
756 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
757
758 /* Choose DMA Rx, DMA Fairness, and Advanced mode */
759 switch_bank(iobase, SET2);
760 outb((inb(iobase+ADCR1) & ~ADCR1_D_CHSW)/*|ADCR1_DMA_F*/|ADCR1_ADV_SL,
761 iobase+ADCR1);
762
763 self->io.direction = IO_RECV;
764 self->rx_buff.data = self->rx_buff.head;
765
766 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
767 spin_lock_irqsave(&self->lock, flags);
768
769 disable_dma(self->io.dma);
770 clear_dma_ff(self->io.dma);
771 set_dma_mode(self->io.dma, DMA_MODE_READ);
772 set_dma_addr(self->io.dma, self->rx_buff_dma);
773 set_dma_count(self->io.dma, self->rx_buff.truesize);
774 #else
775 irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
776 DMA_MODE_READ);
777 #endif
778 /*
779 * Reset Rx FIFO. This will also flush the ST_FIFO, it's very
780 * important that we don't reset the Tx FIFO since it might not
781 * be finished transmitting yet
782 */
783 switch_bank(iobase, SET0);
784 outb(UFR_RXTL|UFR_TXTL|UFR_RXF_RST|UFR_EN_FIFO, iobase+UFR);
785 self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
786
787 /* Enable DMA */
788 switch_bank(iobase, SET0);
789 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
790 hcr = inb(iobase+HCR);
791 outb(hcr | HCR_EN_DMA, iobase+HCR);
792 enable_dma(self->io.dma);
793 spin_unlock_irqrestore(&self->lock, flags);
794 #else
795 outb(inb(iobase+HCR) | HCR_EN_DMA, iobase+HCR);
796 #endif
797 /* Restore set */
798 outb(set, iobase+SSR);
799
800 return 0;
801 }
802
803 /*
804 * Function w83977af_receive_complete (self)
805 *
806 * Finished with receiving a frame
807 *
808 */
809 int w83977af_dma_receive_complete(struct w83977af_ir *self)
810 {
811 struct sk_buff *skb;
812 struct st_fifo *st_fifo;
813 int len;
814 int iobase;
815 __u8 set;
816 __u8 status;
817
818 IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
819
820 st_fifo = &self->st_fifo;
821
822 iobase = self->io.fir_base;
823
824 /* Save current set */
825 set = inb(iobase+SSR);
826
827 iobase = self->io.fir_base;
828
829 /* Read status FIFO */
830 switch_bank(iobase, SET5);
831 while ((status = inb(iobase+FS_FO)) & FS_FO_FSFDR) {
832 st_fifo->entries[st_fifo->tail].status = status;
833
834 st_fifo->entries[st_fifo->tail].len = inb(iobase+RFLFL);
835 st_fifo->entries[st_fifo->tail].len |= inb(iobase+RFLFH) << 8;
836
837 st_fifo->tail++;
838 st_fifo->len++;
839 }
840
841 while (st_fifo->len) {
842 /* Get first entry */
843 status = st_fifo->entries[st_fifo->head].status;
844 len = st_fifo->entries[st_fifo->head].len;
845 st_fifo->head++;
846 st_fifo->len--;
847
848 /* Check for errors */
849 if (status & FS_FO_ERR_MSK) {
850 if (status & FS_FO_LST_FR) {
851 /* Add number of lost frames to stats */
852 self->stats.rx_errors += len;
853 } else {
854 /* Skip frame */
855 self->stats.rx_errors++;
856
857 self->rx_buff.data += len;
858
859 if (status & FS_FO_MX_LEX)
860 self->stats.rx_length_errors++;
861
862 if (status & FS_FO_PHY_ERR)
863 self->stats.rx_frame_errors++;
864
865 if (status & FS_FO_CRC_ERR)
866 self->stats.rx_crc_errors++;
867 }
868 /* The errors below can be reported in both cases */
869 if (status & FS_FO_RX_OV)
870 self->stats.rx_fifo_errors++;
871
872 if (status & FS_FO_FSF_OV)
873 self->stats.rx_fifo_errors++;
874
875 } else {
876 /* Check if we have transferred all data to memory */
877 switch_bank(iobase, SET0);
878 if (inb(iobase+USR) & USR_RDR) {
879 #ifdef CONFIG_USE_INTERNAL_TIMER
880 /* Put this entry back in fifo */
881 st_fifo->head--;
882 st_fifo->len++;
883 st_fifo->entries[st_fifo->head].status = status;
884 st_fifo->entries[st_fifo->head].len = len;
885
886 /* Restore set register */
887 outb(set, iobase+SSR);
888
889 return FALSE; /* I'll be back! */
890 #else
891 udelay(80); /* Should be enough!? */
892 #endif
893 }
894
895 skb = dev_alloc_skb(len+1);
896 if (skb == NULL) {
897 printk(KERN_INFO
898 "%s(), memory squeeze, dropping frame.\n", __FUNCTION__);
899 /* Restore set register */
900 outb(set, iobase+SSR);
901
902 return FALSE;
903 }
904
905 /* Align to 20 bytes */
906 skb_reserve(skb, 1);
907
908 /* Copy frame without CRC */
909 if (self->io.speed < 4000000) {
910 skb_put(skb, len-2);
911 memcpy(skb->data, self->rx_buff.data, len-2);
912 } else {
913 skb_put(skb, len-4);
914 memcpy(skb->data, self->rx_buff.data, len-4);
915 }
916
917 /* Move to next frame */
918 self->rx_buff.data += len;
919 self->stats.rx_packets++;
920
921 skb->dev = self->netdev;
922 skb->mac.raw = skb->data;
923 skb->protocol = htons(ETH_P_IRDA);
924 netif_rx(skb);
925 self->netdev->last_rx = jiffies;
926 }
927 }
928 /* Restore set register */
929 outb(set, iobase+SSR);
930
931 return TRUE;
932 }
933
934 /*
935 * Function pc87108_pio_receive (self)
936 *
937 * Receive all data in receiver FIFO
938 *
939 */
940 static void w83977af_pio_receive(struct w83977af_ir *self)
941 {
942 __u8 byte = 0x00;
943 int iobase;
944
945 IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
946
947 IRDA_ASSERT(self != NULL, return;);
948
949 iobase = self->io.fir_base;
950
951 /* Receive all characters in Rx FIFO */
952 do {
953 byte = inb(iobase+RBR);
954 async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
955 byte);
956 } while (inb(iobase+USR) & USR_RDR); /* Data available */
957 }
958
959 /*
960 * Function w83977af_sir_interrupt (self, eir)
961 *
962 * Handle SIR interrupt
963 *
964 */
965 static __u8 w83977af_sir_interrupt(struct w83977af_ir *self, int isr)
966 {
967 int actual;
968 __u8 new_icr = 0;
969 __u8 set;
970 int iobase;
971
972 IRDA_DEBUG(4, "%s(), isr=%#x\n", __FUNCTION__ , isr);
973
974 iobase = self->io.fir_base;
975 /* Transmit FIFO low on data */
976 if (isr & ISR_TXTH_I) {
977 /* Write data left in transmit buffer */
978 actual = w83977af_pio_write(self->io.fir_base,
979 self->tx_buff.data,
980 self->tx_buff.len,
981 self->io.fifo_size);
982
983 self->tx_buff.data += actual;
984 self->tx_buff.len -= actual;
985
986 self->io.direction = IO_XMIT;
987
988 /* Check if finished */
989 if (self->tx_buff.len > 0) {
990 new_icr |= ICR_ETXTHI;
991 } else {
992 set = inb(iobase+SSR);
993 switch_bank(iobase, SET0);
994 outb(AUDR_SFEND, iobase+AUDR);
995 outb(set, iobase+SSR);
996
997 self->stats.tx_packets++;
998
999 /* Feed me more packets */
1000 netif_wake_queue(self->netdev);
1001 new_icr |= ICR_ETBREI;
1002 }
1003 }
1004 /* Check if transmission has completed */
1005 if (isr & ISR_TXEMP_I) {
1006 /* Check if we need to change the speed? */
1007 if (self->new_speed) {
1008 IRDA_DEBUG(2,
1009 "%s(), Changing speed!\n", __FUNCTION__ );
1010 w83977af_change_speed(self, self->new_speed);
1011 self->new_speed = 0;
1012 }
1013
1014 /* Turn around and get ready to receive some data */
1015 self->io.direction = IO_RECV;
1016 new_icr |= ICR_ERBRI;
1017 }
1018
1019 /* Rx FIFO threshold or timeout */
1020 if (isr & ISR_RXTH_I) {
1021 w83977af_pio_receive(self);
1022
1023 /* Keep receiving */
1024 new_icr |= ICR_ERBRI;
1025 }
1026 return new_icr;
1027 }
1028
1029 /*
1030 * Function pc87108_fir_interrupt (self, eir)
1031 *
1032 * Handle MIR/FIR interrupt
1033 *
1034 */
1035 static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
1036 {
1037 __u8 new_icr = 0;
1038 __u8 set;
1039 int iobase;
1040
1041 iobase = self->io.fir_base;
1042 set = inb(iobase+SSR);
1043
1044 /* End of frame detected in FIFO */
1045 if (isr & (ISR_FEND_I|ISR_FSF_I)) {
1046 if (w83977af_dma_receive_complete(self)) {
1047
1048 /* Wait for next status FIFO interrupt */
1049 new_icr |= ICR_EFSFI;
1050 } else {
1051 /* DMA not finished yet */
1052
1053 /* Set timer value, resolution 1 ms */
1054 switch_bank(iobase, SET4);
1055 outb(0x01, iobase+TMRL); /* 1 ms */
1056 outb(0x00, iobase+TMRH);
1057
1058 /* Start timer */
1059 outb(IR_MSL_EN_TMR, iobase+IR_MSL);
1060
1061 new_icr |= ICR_ETMRI;
1062 }
1063 }
1064 /* Timer finished */
1065 if (isr & ISR_TMR_I) {
1066 /* Disable timer */
1067 switch_bank(iobase, SET4);
1068 outb(0, iobase+IR_MSL);
1069
1070 /* Clear timer event */
1071 /* switch_bank(iobase, SET0); */
1072 /* outb(ASCR_CTE, iobase+ASCR); */
1073
1074 /* Check if this is a TX timer interrupt */
1075 if (self->io.direction == IO_XMIT) {
1076 w83977af_dma_write(self, iobase);
1077
1078 new_icr |= ICR_EDMAI;
1079 } else {
1080 /* Check if DMA has now finished */
1081 w83977af_dma_receive_complete(self);
1082
1083 new_icr |= ICR_EFSFI;
1084 }
1085 }
1086 /* Finished with DMA */
1087 if (isr & ISR_DMA_I) {
1088 w83977af_dma_xmit_complete(self);
1089
1090 /* Check if there are more frames to be transmitted */
1091 /* if (irda_device_txqueue_empty(self)) { */
1092
1093 /* Prepare for receive
1094 *
1095 * ** Netwinder Tx DMA likes that we do this anyway **
1096 */
1097 w83977af_dma_receive(self);
1098 new_icr = ICR_EFSFI;
1099 /* } */
1100 }
1101
1102 /* Restore set */
1103 outb(set, iobase+SSR);
1104
1105 return new_icr;
1106 }
1107
1108 /*
1109 * Function w83977af_interrupt (irq, dev_id, regs)
1110 *
1111 * An interrupt from the chip has arrived. Time to do some work
1112 *
1113 */
1114 static irqreturn_t w83977af_interrupt(int irq, void *dev_id)
1115 {
1116 struct net_device *dev = dev_id;
1117 struct w83977af_ir *self;
1118 __u8 set, icr, isr;
1119 int iobase;
1120
1121 self = dev->priv;
1122
1123 iobase = self->io.fir_base;
1124
1125 /* Save current bank */
1126 set = inb(iobase+SSR);
1127 switch_bank(iobase, SET0);
1128
1129 icr = inb(iobase+ICR);
1130 isr = inb(iobase+ISR) & icr; /* Mask out the interesting ones */
1131
1132 outb(0, iobase+ICR); /* Disable interrupts */
1133
1134 if (isr) {
1135 /* Dispatch interrupt handler for the current speed */
1136 if (self->io.speed > PIO_MAX_SPEED )
1137 icr = w83977af_fir_interrupt(self, isr);
1138 else
1139 icr = w83977af_sir_interrupt(self, isr);
1140 }
1141
1142 outb(icr, iobase+ICR); /* Restore (new) interrupts */
1143 outb(set, iobase+SSR); /* Restore bank register */
1144 return IRQ_RETVAL(isr);
1145 }
1146
1147 /*
1148 * Function w83977af_is_receiving (self)
1149 *
1150 * Return TRUE is we are currently receiving a frame
1151 *
1152 */
1153 static int w83977af_is_receiving(struct w83977af_ir *self)
1154 {
1155 int status = FALSE;
1156 int iobase;
1157 __u8 set;
1158
1159 IRDA_ASSERT(self != NULL, return FALSE;);
1160
1161 if (self->io.speed > 115200) {
1162 iobase = self->io.fir_base;
1163
1164 /* Check if rx FIFO is not empty */
1165 set = inb(iobase+SSR);
1166 switch_bank(iobase, SET2);
1167 if ((inb(iobase+RXFDTH) & 0x3f) != 0) {
1168 /* We are receiving something */
1169 status = TRUE;
1170 }
1171 outb(set, iobase+SSR);
1172 } else
1173 status = (self->rx_buff.state != OUTSIDE_FRAME);
1174
1175 return status;
1176 }
1177
1178 /*
1179 * Function w83977af_net_open (dev)
1180 *
1181 * Start the device
1182 *
1183 */
1184 static int w83977af_net_open(struct net_device *dev)
1185 {
1186 struct w83977af_ir *self;
1187 int iobase;
1188 char hwname[32];
1189 __u8 set;
1190
1191 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1192
1193 IRDA_ASSERT(dev != NULL, return -1;);
1194 self = (struct w83977af_ir *) dev->priv;
1195
1196 IRDA_ASSERT(self != NULL, return 0;);
1197
1198 iobase = self->io.fir_base;
1199
1200 if (request_irq(self->io.irq, w83977af_interrupt, 0, dev->name,
1201 (void *) dev)) {
1202 return -EAGAIN;
1203 }
1204 /*
1205 * Always allocate the DMA channel after the IRQ,
1206 * and clean up on failure.
1207 */
1208 if (request_dma(self->io.dma, dev->name)) {
1209 free_irq(self->io.irq, self);
1210 return -EAGAIN;
1211 }
1212
1213 /* Save current set */
1214 set = inb(iobase+SSR);
1215
1216 /* Enable some interrupts so we can receive frames again */
1217 switch_bank(iobase, SET0);
1218 if (self->io.speed > 115200) {
1219 outb(ICR_EFSFI, iobase+ICR);
1220 w83977af_dma_receive(self);
1221 } else
1222 outb(ICR_ERBRI, iobase+ICR);
1223
1224 /* Restore bank register */
1225 outb(set, iobase+SSR);
1226
1227 /* Ready to play! */
1228 netif_start_queue(dev);
1229
1230 /* Give self a hardware name */
1231 sprintf(hwname, "w83977af @ 0x%03x", self->io.fir_base);
1232
1233 /*
1234 * Open new IrLAP layer instance, now that everything should be
1235 * initialized properly
1236 */
1237 self->irlap = irlap_open(dev, &self->qos, hwname);
1238
1239 return 0;
1240 }
1241
1242 /*
1243 * Function w83977af_net_close (dev)
1244 *
1245 * Stop the device
1246 *
1247 */
1248 static int w83977af_net_close(struct net_device *dev)
1249 {
1250 struct w83977af_ir *self;
1251 int iobase;
1252 __u8 set;
1253
1254 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1255
1256 IRDA_ASSERT(dev != NULL, return -1;);
1257
1258 self = (struct w83977af_ir *) dev->priv;
1259
1260 IRDA_ASSERT(self != NULL, return 0;);
1261
1262 iobase = self->io.fir_base;
1263
1264 /* Stop device */
1265 netif_stop_queue(dev);
1266
1267 /* Stop and remove instance of IrLAP */
1268 if (self->irlap)
1269 irlap_close(self->irlap);
1270 self->irlap = NULL;
1271
1272 disable_dma(self->io.dma);
1273
1274 /* Save current set */
1275 set = inb(iobase+SSR);
1276
1277 /* Disable interrupts */
1278 switch_bank(iobase, SET0);
1279 outb(0, iobase+ICR);
1280
1281 free_irq(self->io.irq, dev);
1282 free_dma(self->io.dma);
1283
1284 /* Restore bank register */
1285 outb(set, iobase+SSR);
1286
1287 return 0;
1288 }
1289
1290 /*
1291 * Function w83977af_net_ioctl (dev, rq, cmd)
1292 *
1293 * Process IOCTL commands for this device
1294 *
1295 */
1296 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1297 {
1298 struct if_irda_req *irq = (struct if_irda_req *) rq;
1299 struct w83977af_ir *self;
1300 unsigned long flags;
1301 int ret = 0;
1302
1303 IRDA_ASSERT(dev != NULL, return -1;);
1304
1305 self = dev->priv;
1306
1307 IRDA_ASSERT(self != NULL, return -1;);
1308
1309 IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__ , dev->name, cmd);
1310
1311 spin_lock_irqsave(&self->lock, flags);
1312
1313 switch (cmd) {
1314 case SIOCSBANDWIDTH: /* Set bandwidth */
1315 if (!capable(CAP_NET_ADMIN)) {
1316 ret = -EPERM;
1317 goto out;
1318 }
1319 w83977af_change_speed(self, irq->ifr_baudrate);
1320 break;
1321 case SIOCSMEDIABUSY: /* Set media busy */
1322 if (!capable(CAP_NET_ADMIN)) {
1323 ret = -EPERM;
1324 goto out;
1325 }
1326 irda_device_set_media_busy(self->netdev, TRUE);
1327 break;
1328 case SIOCGRECEIVING: /* Check if we are receiving right now */
1329 irq->ifr_receiving = w83977af_is_receiving(self);
1330 break;
1331 default:
1332 ret = -EOPNOTSUPP;
1333 }
1334 out:
1335 spin_unlock_irqrestore(&self->lock, flags);
1336 return ret;
1337 }
1338
1339 static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev)
1340 {
1341 struct w83977af_ir *self = (struct w83977af_ir *) dev->priv;
1342
1343 return &self->stats;
1344 }
1345
1346 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1347 MODULE_DESCRIPTION("Winbond W83977AF IrDA Device Driver");
1348 MODULE_LICENSE("GPL");
1349
1350
1351 module_param(qos_mtt_bits, int, 0);
1352 MODULE_PARM_DESC(qos_mtt_bits, "Mimimum Turn Time");
1353 module_param_array(io, int, NULL, 0);
1354 MODULE_PARM_DESC(io, "Base I/O addresses");
1355 module_param_array(irq, int, NULL, 0);
1356 MODULE_PARM_DESC(irq, "IRQ lines");
1357
1358 /*
1359 * Function init_module (void)
1360 *
1361 *
1362 *
1363 */
1364 module_init(w83977af_init);
1365
1366 /*
1367 * Function cleanup_module (void)
1368 *
1369 *
1370 *
1371 */
1372 module_exit(w83977af_cleanup);
Linux with added FPC-III support