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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / drivers / net / irda / w83977af_ir.c
blob7d43506c70328cfc70801c9fa20050e2d5e683fd
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/init.h>
50 #include <linux/interrupt.h>
51 #include <linux/rtnetlink.h>
52 #include <linux/dma-mapping.h>
53 #include <linux/gfp.h>
54
55 #include <asm/io.h>
56 #include <asm/dma.h>
57 #include <asm/byteorder.h>
58
59 #include <net/irda/irda.h>
60 #include <net/irda/wrapper.h>
61 #include <net/irda/irda_device.h>
62 #include "w83977af.h"
63 #include "w83977af_ir.h"
64
65 #ifdef CONFIG_ARCH_NETWINDER /* Adjust to NetWinder differences */
66 #undef CONFIG_NETWINDER_TX_DMA_PROBLEMS /* Not needed */
67 #define CONFIG_NETWINDER_RX_DMA_PROBLEMS /* Must have this one! */
68 #endif
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 netdev_tx_t w83977af_hard_xmit(struct sk_buff *skb,
97 struct net_device *dev);
98 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
99 static void w83977af_dma_write(struct w83977af_ir *self, int iobase);
100 static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed);
101 static int w83977af_is_receiving(struct w83977af_ir *self);
102
103 static int w83977af_net_open(struct net_device *dev);
104 static int w83977af_net_close(struct net_device *dev);
105 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
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", __func__ );
118
119 for (i=0; i < ARRAY_SIZE(dev_self) && io[i] < 2000; 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", __func__ );
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 static const struct net_device_ops w83977_netdev_ops = {
145 .ndo_open = w83977af_net_open,
146 .ndo_stop = w83977af_net_close,
147 .ndo_start_xmit = w83977af_hard_xmit,
148 .ndo_do_ioctl = w83977af_net_ioctl,
149 };
150
151 /*
152 * Function w83977af_open (iobase, irq)
153 *
154 * Open driver instance
155 *
156 */
157 static int w83977af_open(int i, unsigned int iobase, unsigned int irq,
158 unsigned int dma)
159 {
160 struct net_device *dev;
161 struct w83977af_ir *self;
162 int err;
163
164 IRDA_DEBUG(0, "%s()\n", __func__ );
165
166 /* Lock the port that we need */
167 if (!request_region(iobase, CHIP_IO_EXTENT, driver_name)) {
168 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
169 __func__ , iobase);
170 return -ENODEV;
171 }
172
173 if (w83977af_probe(iobase, irq, dma) == -1) {
174 err = -1;
175 goto err_out;
176 }
177 /*
178 * Allocate new instance of the driver
179 */
180 dev = alloc_irdadev(sizeof(struct w83977af_ir));
181 if (dev == NULL) {
182 printk( KERN_ERR "IrDA: Can't allocate memory for "
183 "IrDA control block!\n");
184 err = -ENOMEM;
185 goto err_out;
186 }
187
188 self = netdev_priv(dev);
189 spin_lock_init(&self->lock);
190
191
192 /* Initialize IO */
193 self->io.fir_base = iobase;
194 self->io.irq = irq;
195 self->io.fir_ext = CHIP_IO_EXTENT;
196 self->io.dma = dma;
197 self->io.fifo_size = 32;
198
199 /* Initialize QoS for this device */
200 irda_init_max_qos_capabilies(&self->qos);
201
202 /* The only value we must override it the baudrate */
203
204 /* FIXME: The HP HDLS-1100 does not support 1152000! */
205 self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
206 IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);
207
208 /* The HP HDLS-1100 needs 1 ms according to the specs */
209 self->qos.min_turn_time.bits = qos_mtt_bits;
210 irda_qos_bits_to_value(&self->qos);
211
212 /* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
213 self->rx_buff.truesize = 14384;
214 self->tx_buff.truesize = 4000;
215
216 /* Allocate memory if needed */
217 self->rx_buff.head =
218 dma_alloc_coherent(NULL, self->rx_buff.truesize,
219 &self->rx_buff_dma, GFP_KERNEL);
220 if (self->rx_buff.head == NULL) {
221 err = -ENOMEM;
222 goto err_out1;
223 }
224
225 memset(self->rx_buff.head, 0, self->rx_buff.truesize);
226
227 self->tx_buff.head =
228 dma_alloc_coherent(NULL, self->tx_buff.truesize,
229 &self->tx_buff_dma, GFP_KERNEL);
230 if (self->tx_buff.head == NULL) {
231 err = -ENOMEM;
232 goto err_out2;
233 }
234 memset(self->tx_buff.head, 0, self->tx_buff.truesize);
235
236 self->rx_buff.in_frame = FALSE;
237 self->rx_buff.state = OUTSIDE_FRAME;
238 self->tx_buff.data = self->tx_buff.head;
239 self->rx_buff.data = self->rx_buff.head;
240 self->netdev = dev;
241
242 dev->netdev_ops = &w83977_netdev_ops;
243
244 err = register_netdev(dev);
245 if (err) {
246 IRDA_ERROR("%s(), register_netdevice() failed!\n", __func__);
247 goto err_out3;
248 }
249 IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
250
251 /* Need to store self somewhere */
252 dev_self[i] = self;
253
254 return 0;
255 err_out3:
256 dma_free_coherent(NULL, self->tx_buff.truesize,
257 self->tx_buff.head, self->tx_buff_dma);
258 err_out2:
259 dma_free_coherent(NULL, self->rx_buff.truesize,
260 self->rx_buff.head, self->rx_buff_dma);
261 err_out1:
262 free_netdev(dev);
263 err_out:
264 release_region(iobase, CHIP_IO_EXTENT);
265 return err;
266 }
267
268 /*
269 * Function w83977af_close (self)
270 *
271 * Close driver instance
272 *
273 */
274 static int w83977af_close(struct w83977af_ir *self)
275 {
276 int iobase;
277
278 IRDA_DEBUG(0, "%s()\n", __func__ );
279
280 iobase = self->io.fir_base;
281
282 #ifdef CONFIG_USE_W977_PNP
283 /* enter PnP configuration mode */
284 w977_efm_enter(efio);
285
286 w977_select_device(W977_DEVICE_IR, efio);
287
288 /* Deactivate device */
289 w977_write_reg(0x30, 0x00, efio);
290
291 w977_efm_exit(efio);
292 #endif /* CONFIG_USE_W977_PNP */
293
294 /* Remove netdevice */
295 unregister_netdev(self->netdev);
296
297 /* Release the PORT that this driver is using */
298 IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
299 __func__ , self->io.fir_base);
300 release_region(self->io.fir_base, self->io.fir_ext);
301
302 if (self->tx_buff.head)
303 dma_free_coherent(NULL, self->tx_buff.truesize,
304 self->tx_buff.head, self->tx_buff_dma);
305
306 if (self->rx_buff.head)
307 dma_free_coherent(NULL, self->rx_buff.truesize,
308 self->rx_buff.head, self->rx_buff_dma);
309
310 free_netdev(self->netdev);
311
312 return 0;
313 }
314
315 static int w83977af_probe(int iobase, int irq, int dma)
316 {
317 int version;
318 int i;
319
320 for (i=0; i < 2; i++) {
321 IRDA_DEBUG( 0, "%s()\n", __func__ );
322 #ifdef CONFIG_USE_W977_PNP
323 /* Enter PnP configuration mode */
324 w977_efm_enter(efbase[i]);
325
326 w977_select_device(W977_DEVICE_IR, efbase[i]);
327
328 /* Configure PnP port, IRQ, and DMA channel */
329 w977_write_reg(0x60, (iobase >> 8) & 0xff, efbase[i]);
330 w977_write_reg(0x61, (iobase) & 0xff, efbase[i]);
331
332 w977_write_reg(0x70, irq, efbase[i]);
333 #ifdef CONFIG_ARCH_NETWINDER
334 /* Netwinder uses 1 higher than Linux */
335 w977_write_reg(0x74, dma+1, efbase[i]);
336 #else
337 w977_write_reg(0x74, dma, efbase[i]);
338 #endif /*CONFIG_ARCH_NETWINDER */
339 w977_write_reg(0x75, 0x04, efbase[i]); /* Disable Tx DMA */
340
341 /* Set append hardware CRC, enable IR bank selection */
342 w977_write_reg(0xf0, APEDCRC|ENBNKSEL, efbase[i]);
343
344 /* Activate device */
345 w977_write_reg(0x30, 0x01, efbase[i]);
346
347 w977_efm_exit(efbase[i]);
348 #endif /* CONFIG_USE_W977_PNP */
349 /* Disable Advanced mode */
350 switch_bank(iobase, SET2);
351 outb(iobase+2, 0x00);
352
353 /* Turn on UART (global) interrupts */
354 switch_bank(iobase, SET0);
355 outb(HCR_EN_IRQ, iobase+HCR);
356
357 /* Switch to advanced mode */
358 switch_bank(iobase, SET2);
359 outb(inb(iobase+ADCR1) | ADCR1_ADV_SL, iobase+ADCR1);
360
361 /* Set default IR-mode */
362 switch_bank(iobase, SET0);
363 outb(HCR_SIR, iobase+HCR);
364
365 /* Read the Advanced IR ID */
366 switch_bank(iobase, SET3);
367 version = inb(iobase+AUID);
368
369 /* Should be 0x1? */
370 if (0x10 == (version & 0xf0)) {
371 efio = efbase[i];
372
373 /* Set FIFO size to 32 */
374 switch_bank(iobase, SET2);
375 outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
376
377 /* Set FIFO threshold to TX17, RX16 */
378 switch_bank(iobase, SET0);
379 outb(UFR_RXTL|UFR_TXTL|UFR_TXF_RST|UFR_RXF_RST|
380 UFR_EN_FIFO,iobase+UFR);
381
382 /* Receiver frame length */
383 switch_bank(iobase, SET4);
384 outb(2048 & 0xff, iobase+6);
385 outb((2048 >> 8) & 0x1f, iobase+7);
386
387 /*
388 * Init HP HSDL-1100 transceiver.
389 *
390 * Set IRX_MSL since we have 2 * receive paths IRRX,
391 * and IRRXH. Clear IRSL0D since we want IRSL0 * to
392 * be a input pin used for IRRXH
393 *
394 * IRRX pin 37 connected to receiver
395 * IRTX pin 38 connected to transmitter
396 * FIRRX pin 39 connected to receiver (IRSL0)
397 * CIRRX pin 40 connected to pin 37
398 */
399 switch_bank(iobase, SET7);
400 outb(0x40, iobase+7);
401
402 IRDA_MESSAGE("W83977AF (IR) driver loaded. "
403 "Version: 0x%02x\n", version);
404
405 return 0;
406 } else {
407 /* Try next extented function register address */
408 IRDA_DEBUG( 0, "%s(), Wrong chip version", __func__ );
409 }
410 }
411 return -1;
412 }
413
414 static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed)
415 {
416 int ir_mode = HCR_SIR;
417 int iobase;
418 __u8 set;
419
420 iobase = self->io.fir_base;
421
422 /* Update accounting for new speed */
423 self->io.speed = speed;
424
425 /* Save current bank */
426 set = inb(iobase+SSR);
427
428 /* Disable interrupts */
429 switch_bank(iobase, SET0);
430 outb(0, iobase+ICR);
431
432 /* Select Set 2 */
433 switch_bank(iobase, SET2);
434 outb(0x00, iobase+ABHL);
435
436 switch (speed) {
437 case 9600: outb(0x0c, iobase+ABLL); break;
438 case 19200: outb(0x06, iobase+ABLL); break;
439 case 38400: outb(0x03, iobase+ABLL); break;
440 case 57600: outb(0x02, iobase+ABLL); break;
441 case 115200: outb(0x01, iobase+ABLL); break;
442 case 576000:
443 ir_mode = HCR_MIR_576;
444 IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __func__ );
445 break;
446 case 1152000:
447 ir_mode = HCR_MIR_1152;
448 IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __func__ );
449 break;
450 case 4000000:
451 ir_mode = HCR_FIR;
452 IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __func__ );
453 break;
454 default:
455 ir_mode = HCR_FIR;
456 IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n", __func__ , speed);
457 break;
458 }
459
460 /* Set speed mode */
461 switch_bank(iobase, SET0);
462 outb(ir_mode, iobase+HCR);
463
464 /* set FIFO size to 32 */
465 switch_bank(iobase, SET2);
466 outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
467
468 /* set FIFO threshold to TX17, RX16 */
469 switch_bank(iobase, SET0);
470 outb(0x00, iobase+UFR); /* Reset */
471 outb(UFR_EN_FIFO, iobase+UFR); /* First we must enable FIFO */
472 outb(0xa7, iobase+UFR);
473
474 netif_wake_queue(self->netdev);
475
476 /* Enable some interrupts so we can receive frames */
477 switch_bank(iobase, SET0);
478 if (speed > PIO_MAX_SPEED) {
479 outb(ICR_EFSFI, iobase+ICR);
480 w83977af_dma_receive(self);
481 } else
482 outb(ICR_ERBRI, iobase+ICR);
483
484 /* Restore SSR */
485 outb(set, iobase+SSR);
486 }
487
488 /*
489 * Function w83977af_hard_xmit (skb, dev)
490 *
491 * Sets up a DMA transfer to send the current frame.
492 *
493 */
494 static netdev_tx_t w83977af_hard_xmit(struct sk_buff *skb,
495 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 = netdev_priv(dev);
504
505 iobase = self->io.fir_base;
506
507 IRDA_DEBUG(4, "%s(%ld), skb->len=%d\n", __func__ , 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_kfree_skb(skb);
520 return NETDEV_TX_OK;
521 } else
522 self->new_speed = speed;
523 }
524
525 /* Save current set */
526 set = inb(iobase+SSR);
527
528 /* Decide if we should use PIO or DMA transfer */
529 if (self->io.speed > PIO_MAX_SPEED) {
530 self->tx_buff.data = self->tx_buff.head;
531 skb_copy_from_linear_data(skb, self->tx_buff.data, skb->len);
532 self->tx_buff.len = skb->len;
533
534 mtt = irda_get_mtt(skb);
535 IRDA_DEBUG(4, "%s(%ld), mtt=%d\n", __func__ , jiffies, mtt);
536 if (mtt)
537 udelay(mtt);
538
539 /* Enable DMA interrupt */
540 switch_bank(iobase, SET0);
541 outb(ICR_EDMAI, iobase+ICR);
542 w83977af_dma_write(self, iobase);
543 } else {
544 self->tx_buff.data = self->tx_buff.head;
545 self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
546 self->tx_buff.truesize);
547
548 /* Add interrupt on tx low level (will fire immediately) */
549 switch_bank(iobase, SET0);
550 outb(ICR_ETXTHI, iobase+ICR);
551 }
552 dev_kfree_skb(skb);
553
554 /* Restore set register */
555 outb(set, iobase+SSR);
556
557 return NETDEV_TX_OK;
558 }
559
560 /*
561 * Function w83977af_dma_write (self, iobase)
562 *
563 * Send frame using DMA
564 *
565 */
566 static void w83977af_dma_write(struct w83977af_ir *self, int iobase)
567 {
568 __u8 set;
569 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
570 unsigned long flags;
571 __u8 hcr;
572 #endif
573 IRDA_DEBUG(4, "%s(), len=%d\n", __func__ , self->tx_buff.len);
574
575 /* Save current set */
576 set = inb(iobase+SSR);
577
578 /* Disable DMA */
579 switch_bank(iobase, SET0);
580 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
581
582 /* Choose transmit DMA channel */
583 switch_bank(iobase, SET2);
584 outb(ADCR1_D_CHSW|/*ADCR1_DMA_F|*/ADCR1_ADV_SL, iobase+ADCR1);
585 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
586 spin_lock_irqsave(&self->lock, flags);
587
588 disable_dma(self->io.dma);
589 clear_dma_ff(self->io.dma);
590 set_dma_mode(self->io.dma, DMA_MODE_READ);
591 set_dma_addr(self->io.dma, self->tx_buff_dma);
592 set_dma_count(self->io.dma, self->tx_buff.len);
593 #else
594 irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
595 DMA_MODE_WRITE);
596 #endif
597 self->io.direction = IO_XMIT;
598
599 /* Enable DMA */
600 switch_bank(iobase, SET0);
601 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
602 hcr = inb(iobase+HCR);
603 outb(hcr | HCR_EN_DMA, iobase+HCR);
604 enable_dma(self->io.dma);
605 spin_unlock_irqrestore(&self->lock, flags);
606 #else
607 outb(inb(iobase+HCR) | HCR_EN_DMA | HCR_TX_WT, iobase+HCR);
608 #endif
609
610 /* Restore set register */
611 outb(set, iobase+SSR);
612 }
613
614 /*
615 * Function w83977af_pio_write (iobase, buf, len, fifo_size)
616 *
617 *
618 *
619 */
620 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
621 {
622 int actual = 0;
623 __u8 set;
624
625 IRDA_DEBUG(4, "%s()\n", __func__ );
626
627 /* Save current bank */
628 set = inb(iobase+SSR);
629
630 switch_bank(iobase, SET0);
631 if (!(inb_p(iobase+USR) & USR_TSRE)) {
632 IRDA_DEBUG(4,
633 "%s(), warning, FIFO not empty yet!\n", __func__ );
634
635 fifo_size -= 17;
636 IRDA_DEBUG(4, "%s(), %d bytes left in tx fifo\n",
637 __func__ , fifo_size);
638 }
639
640 /* Fill FIFO with current frame */
641 while ((fifo_size-- > 0) && (actual < len)) {
642 /* Transmit next byte */
643 outb(buf[actual++], iobase+TBR);
644 }
645
646 IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n",
647 __func__ , fifo_size, actual, len);
648
649 /* Restore bank */
650 outb(set, iobase+SSR);
651
652 return actual;
653 }
654
655 /*
656 * Function w83977af_dma_xmit_complete (self)
657 *
658 * The transfer of a frame in finished. So do the necessary things
659 *
660 *
661 */
662 static void w83977af_dma_xmit_complete(struct w83977af_ir *self)
663 {
664 int iobase;
665 __u8 set;
666
667 IRDA_DEBUG(4, "%s(%ld)\n", __func__ , jiffies);
668
669 IRDA_ASSERT(self != NULL, return;);
670
671 iobase = self->io.fir_base;
672
673 /* Save current set */
674 set = inb(iobase+SSR);
675
676 /* Disable DMA */
677 switch_bank(iobase, SET0);
678 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
679
680 /* Check for underrun! */
681 if (inb(iobase+AUDR) & AUDR_UNDR) {
682 IRDA_DEBUG(0, "%s(), Transmit underrun!\n", __func__ );
683
684 self->netdev->stats.tx_errors++;
685 self->netdev->stats.tx_fifo_errors++;
686
687 /* Clear bit, by writing 1 to it */
688 outb(AUDR_UNDR, iobase+AUDR);
689 } else
690 self->netdev->stats.tx_packets++;
691
692
693 if (self->new_speed) {
694 w83977af_change_speed(self, self->new_speed);
695 self->new_speed = 0;
696 }
697
698 /* Unlock tx_buff and request another frame */
699 /* Tell the network layer, that we want more frames */
700 netif_wake_queue(self->netdev);
701
702 /* Restore set */
703 outb(set, iobase+SSR);
704 }
705
706 /*
707 * Function w83977af_dma_receive (self)
708 *
709 * Get ready for receiving a frame. The device will initiate a DMA
710 * if it starts to receive a frame.
711 *
712 */
713 static int w83977af_dma_receive(struct w83977af_ir *self)
714 {
715 int iobase;
716 __u8 set;
717 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
718 unsigned long flags;
719 __u8 hcr;
720 #endif
721 IRDA_ASSERT(self != NULL, return -1;);
722
723 IRDA_DEBUG(4, "%s\n", __func__ );
724
725 iobase= self->io.fir_base;
726
727 /* Save current set */
728 set = inb(iobase+SSR);
729
730 /* Disable DMA */
731 switch_bank(iobase, SET0);
732 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
733
734 /* Choose DMA Rx, DMA Fairness, and Advanced mode */
735 switch_bank(iobase, SET2);
736 outb((inb(iobase+ADCR1) & ~ADCR1_D_CHSW)/*|ADCR1_DMA_F*/|ADCR1_ADV_SL,
737 iobase+ADCR1);
738
739 self->io.direction = IO_RECV;
740 self->rx_buff.data = self->rx_buff.head;
741
742 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
743 spin_lock_irqsave(&self->lock, flags);
744
745 disable_dma(self->io.dma);
746 clear_dma_ff(self->io.dma);
747 set_dma_mode(self->io.dma, DMA_MODE_READ);
748 set_dma_addr(self->io.dma, self->rx_buff_dma);
749 set_dma_count(self->io.dma, self->rx_buff.truesize);
750 #else
751 irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
752 DMA_MODE_READ);
753 #endif
754 /*
755 * Reset Rx FIFO. This will also flush the ST_FIFO, it's very
756 * important that we don't reset the Tx FIFO since it might not
757 * be finished transmitting yet
758 */
759 switch_bank(iobase, SET0);
760 outb(UFR_RXTL|UFR_TXTL|UFR_RXF_RST|UFR_EN_FIFO, iobase+UFR);
761 self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
762
763 /* Enable DMA */
764 switch_bank(iobase, SET0);
765 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
766 hcr = inb(iobase+HCR);
767 outb(hcr | HCR_EN_DMA, iobase+HCR);
768 enable_dma(self->io.dma);
769 spin_unlock_irqrestore(&self->lock, flags);
770 #else
771 outb(inb(iobase+HCR) | HCR_EN_DMA, iobase+HCR);
772 #endif
773 /* Restore set */
774 outb(set, iobase+SSR);
775
776 return 0;
777 }
778
779 /*
780 * Function w83977af_receive_complete (self)
781 *
782 * Finished with receiving a frame
783 *
784 */
785 static int w83977af_dma_receive_complete(struct w83977af_ir *self)
786 {
787 struct sk_buff *skb;
788 struct st_fifo *st_fifo;
789 int len;
790 int iobase;
791 __u8 set;
792 __u8 status;
793
794 IRDA_DEBUG(4, "%s\n", __func__ );
795
796 st_fifo = &self->st_fifo;
797
798 iobase = self->io.fir_base;
799
800 /* Save current set */
801 set = inb(iobase+SSR);
802
803 iobase = self->io.fir_base;
804
805 /* Read status FIFO */
806 switch_bank(iobase, SET5);
807 while ((status = inb(iobase+FS_FO)) & FS_FO_FSFDR) {
808 st_fifo->entries[st_fifo->tail].status = status;
809
810 st_fifo->entries[st_fifo->tail].len = inb(iobase+RFLFL);
811 st_fifo->entries[st_fifo->tail].len |= inb(iobase+RFLFH) << 8;
812
813 st_fifo->tail++;
814 st_fifo->len++;
815 }
816
817 while (st_fifo->len) {
818 /* Get first entry */
819 status = st_fifo->entries[st_fifo->head].status;
820 len = st_fifo->entries[st_fifo->head].len;
821 st_fifo->head++;
822 st_fifo->len--;
823
824 /* Check for errors */
825 if (status & FS_FO_ERR_MSK) {
826 if (status & FS_FO_LST_FR) {
827 /* Add number of lost frames to stats */
828 self->netdev->stats.rx_errors += len;
829 } else {
830 /* Skip frame */
831 self->netdev->stats.rx_errors++;
832
833 self->rx_buff.data += len;
834
835 if (status & FS_FO_MX_LEX)
836 self->netdev->stats.rx_length_errors++;
837
838 if (status & FS_FO_PHY_ERR)
839 self->netdev->stats.rx_frame_errors++;
840
841 if (status & FS_FO_CRC_ERR)
842 self->netdev->stats.rx_crc_errors++;
843 }
844 /* The errors below can be reported in both cases */
845 if (status & FS_FO_RX_OV)
846 self->netdev->stats.rx_fifo_errors++;
847
848 if (status & FS_FO_FSF_OV)
849 self->netdev->stats.rx_fifo_errors++;
850
851 } else {
852 /* Check if we have transferred all data to memory */
853 switch_bank(iobase, SET0);
854 if (inb(iobase+USR) & USR_RDR) {
855 udelay(80); /* Should be enough!? */
856 }
857
858 skb = dev_alloc_skb(len+1);
859 if (skb == NULL) {
860 printk(KERN_INFO
861 "%s(), memory squeeze, dropping frame.\n", __func__);
862 /* Restore set register */
863 outb(set, iobase+SSR);
864
865 return FALSE;
866 }
867
868 /* Align to 20 bytes */
869 skb_reserve(skb, 1);
870
871 /* Copy frame without CRC */
872 if (self->io.speed < 4000000) {
873 skb_put(skb, len-2);
874 skb_copy_to_linear_data(skb,
875 self->rx_buff.data,
876 len - 2);
877 } else {
878 skb_put(skb, len-4);
879 skb_copy_to_linear_data(skb,
880 self->rx_buff.data,
881 len - 4);
882 }
883
884 /* Move to next frame */
885 self->rx_buff.data += len;
886 self->netdev->stats.rx_packets++;
887
888 skb->dev = self->netdev;
889 skb_reset_mac_header(skb);
890 skb->protocol = htons(ETH_P_IRDA);
891 netif_rx(skb);
892 }
893 }
894 /* Restore set register */
895 outb(set, iobase+SSR);
896
897 return TRUE;
898 }
899
900 /*
901 * Function pc87108_pio_receive (self)
902 *
903 * Receive all data in receiver FIFO
904 *
905 */
906 static void w83977af_pio_receive(struct w83977af_ir *self)
907 {
908 __u8 byte = 0x00;
909 int iobase;
910
911 IRDA_DEBUG(4, "%s()\n", __func__ );
912
913 IRDA_ASSERT(self != NULL, return;);
914
915 iobase = self->io.fir_base;
916
917 /* Receive all characters in Rx FIFO */
918 do {
919 byte = inb(iobase+RBR);
920 async_unwrap_char(self->netdev, &self->netdev->stats, &self->rx_buff,
921 byte);
922 } while (inb(iobase+USR) & USR_RDR); /* Data available */
923 }
924
925 /*
926 * Function w83977af_sir_interrupt (self, eir)
927 *
928 * Handle SIR interrupt
929 *
930 */
931 static __u8 w83977af_sir_interrupt(struct w83977af_ir *self, int isr)
932 {
933 int actual;
934 __u8 new_icr = 0;
935 __u8 set;
936 int iobase;
937
938 IRDA_DEBUG(4, "%s(), isr=%#x\n", __func__ , isr);
939
940 iobase = self->io.fir_base;
941 /* Transmit FIFO low on data */
942 if (isr & ISR_TXTH_I) {
943 /* Write data left in transmit buffer */
944 actual = w83977af_pio_write(self->io.fir_base,
945 self->tx_buff.data,
946 self->tx_buff.len,
947 self->io.fifo_size);
948
949 self->tx_buff.data += actual;
950 self->tx_buff.len -= actual;
951
952 self->io.direction = IO_XMIT;
953
954 /* Check if finished */
955 if (self->tx_buff.len > 0) {
956 new_icr |= ICR_ETXTHI;
957 } else {
958 set = inb(iobase+SSR);
959 switch_bank(iobase, SET0);
960 outb(AUDR_SFEND, iobase+AUDR);
961 outb(set, iobase+SSR);
962
963 self->netdev->stats.tx_packets++;
964
965 /* Feed me more packets */
966 netif_wake_queue(self->netdev);
967 new_icr |= ICR_ETBREI;
968 }
969 }
970 /* Check if transmission has completed */
971 if (isr & ISR_TXEMP_I) {
972 /* Check if we need to change the speed? */
973 if (self->new_speed) {
974 IRDA_DEBUG(2,
975 "%s(), Changing speed!\n", __func__ );
976 w83977af_change_speed(self, self->new_speed);
977 self->new_speed = 0;
978 }
979
980 /* Turn around and get ready to receive some data */
981 self->io.direction = IO_RECV;
982 new_icr |= ICR_ERBRI;
983 }
984
985 /* Rx FIFO threshold or timeout */
986 if (isr & ISR_RXTH_I) {
987 w83977af_pio_receive(self);
988
989 /* Keep receiving */
990 new_icr |= ICR_ERBRI;
991 }
992 return new_icr;
993 }
994
995 /*
996 * Function pc87108_fir_interrupt (self, eir)
997 *
998 * Handle MIR/FIR interrupt
999 *
1000 */
1001 static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
1002 {
1003 __u8 new_icr = 0;
1004 __u8 set;
1005 int iobase;
1006
1007 iobase = self->io.fir_base;
1008 set = inb(iobase+SSR);
1009
1010 /* End of frame detected in FIFO */
1011 if (isr & (ISR_FEND_I|ISR_FSF_I)) {
1012 if (w83977af_dma_receive_complete(self)) {
1013
1014 /* Wait for next status FIFO interrupt */
1015 new_icr |= ICR_EFSFI;
1016 } else {
1017 /* DMA not finished yet */
1018
1019 /* Set timer value, resolution 1 ms */
1020 switch_bank(iobase, SET4);
1021 outb(0x01, iobase+TMRL); /* 1 ms */
1022 outb(0x00, iobase+TMRH);
1023
1024 /* Start timer */
1025 outb(IR_MSL_EN_TMR, iobase+IR_MSL);
1026
1027 new_icr |= ICR_ETMRI;
1028 }
1029 }
1030 /* Timer finished */
1031 if (isr & ISR_TMR_I) {
1032 /* Disable timer */
1033 switch_bank(iobase, SET4);
1034 outb(0, iobase+IR_MSL);
1035
1036 /* Clear timer event */
1037 /* switch_bank(iobase, SET0); */
1038 /* outb(ASCR_CTE, iobase+ASCR); */
1039
1040 /* Check if this is a TX timer interrupt */
1041 if (self->io.direction == IO_XMIT) {
1042 w83977af_dma_write(self, iobase);
1043
1044 new_icr |= ICR_EDMAI;
1045 } else {
1046 /* Check if DMA has now finished */
1047 w83977af_dma_receive_complete(self);
1048
1049 new_icr |= ICR_EFSFI;
1050 }
1051 }
1052 /* Finished with DMA */
1053 if (isr & ISR_DMA_I) {
1054 w83977af_dma_xmit_complete(self);
1055
1056 /* Check if there are more frames to be transmitted */
1057 /* if (irda_device_txqueue_empty(self)) { */
1058
1059 /* Prepare for receive
1060 *
1061 * ** Netwinder Tx DMA likes that we do this anyway **
1062 */
1063 w83977af_dma_receive(self);
1064 new_icr = ICR_EFSFI;
1065 /* } */
1066 }
1067
1068 /* Restore set */
1069 outb(set, iobase+SSR);
1070
1071 return new_icr;
1072 }
1073
1074 /*
1075 * Function w83977af_interrupt (irq, dev_id, regs)
1076 *
1077 * An interrupt from the chip has arrived. Time to do some work
1078 *
1079 */
1080 static irqreturn_t w83977af_interrupt(int irq, void *dev_id)
1081 {
1082 struct net_device *dev = dev_id;
1083 struct w83977af_ir *self;
1084 __u8 set, icr, isr;
1085 int iobase;
1086
1087 self = netdev_priv(dev);
1088
1089 iobase = self->io.fir_base;
1090
1091 /* Save current bank */
1092 set = inb(iobase+SSR);
1093 switch_bank(iobase, SET0);
1094
1095 icr = inb(iobase+ICR);
1096 isr = inb(iobase+ISR) & icr; /* Mask out the interesting ones */
1097
1098 outb(0, iobase+ICR); /* Disable interrupts */
1099
1100 if (isr) {
1101 /* Dispatch interrupt handler for the current speed */
1102 if (self->io.speed > PIO_MAX_SPEED )
1103 icr = w83977af_fir_interrupt(self, isr);
1104 else
1105 icr = w83977af_sir_interrupt(self, isr);
1106 }
1107
1108 outb(icr, iobase+ICR); /* Restore (new) interrupts */
1109 outb(set, iobase+SSR); /* Restore bank register */
1110 return IRQ_RETVAL(isr);
1111 }
1112
1113 /*
1114 * Function w83977af_is_receiving (self)
1115 *
1116 * Return TRUE is we are currently receiving a frame
1117 *
1118 */
1119 static int w83977af_is_receiving(struct w83977af_ir *self)
1120 {
1121 int status = FALSE;
1122 int iobase;
1123 __u8 set;
1124
1125 IRDA_ASSERT(self != NULL, return FALSE;);
1126
1127 if (self->io.speed > 115200) {
1128 iobase = self->io.fir_base;
1129
1130 /* Check if rx FIFO is not empty */
1131 set = inb(iobase+SSR);
1132 switch_bank(iobase, SET2);
1133 if ((inb(iobase+RXFDTH) & 0x3f) != 0) {
1134 /* We are receiving something */
1135 status = TRUE;
1136 }
1137 outb(set, iobase+SSR);
1138 } else
1139 status = (self->rx_buff.state != OUTSIDE_FRAME);
1140
1141 return status;
1142 }
1143
1144 /*
1145 * Function w83977af_net_open (dev)
1146 *
1147 * Start the device
1148 *
1149 */
1150 static int w83977af_net_open(struct net_device *dev)
1151 {
1152 struct w83977af_ir *self;
1153 int iobase;
1154 char hwname[32];
1155 __u8 set;
1156
1157 IRDA_DEBUG(0, "%s()\n", __func__ );
1158
1159 IRDA_ASSERT(dev != NULL, return -1;);
1160 self = netdev_priv(dev);
1161
1162 IRDA_ASSERT(self != NULL, return 0;);
1163
1164 iobase = self->io.fir_base;
1165
1166 if (request_irq(self->io.irq, w83977af_interrupt, 0, dev->name,
1167 (void *) dev)) {
1168 return -EAGAIN;
1169 }
1170 /*
1171 * Always allocate the DMA channel after the IRQ,
1172 * and clean up on failure.
1173 */
1174 if (request_dma(self->io.dma, dev->name)) {
1175 free_irq(self->io.irq, self);
1176 return -EAGAIN;
1177 }
1178
1179 /* Save current set */
1180 set = inb(iobase+SSR);
1181
1182 /* Enable some interrupts so we can receive frames again */
1183 switch_bank(iobase, SET0);
1184 if (self->io.speed > 115200) {
1185 outb(ICR_EFSFI, iobase+ICR);
1186 w83977af_dma_receive(self);
1187 } else
1188 outb(ICR_ERBRI, iobase+ICR);
1189
1190 /* Restore bank register */
1191 outb(set, iobase+SSR);
1192
1193 /* Ready to play! */
1194 netif_start_queue(dev);
1195
1196 /* Give self a hardware name */
1197 sprintf(hwname, "w83977af @ 0x%03x", self->io.fir_base);
1198
1199 /*
1200 * Open new IrLAP layer instance, now that everything should be
1201 * initialized properly
1202 */
1203 self->irlap = irlap_open(dev, &self->qos, hwname);
1204
1205 return 0;
1206 }
1207
1208 /*
1209 * Function w83977af_net_close (dev)
1210 *
1211 * Stop the device
1212 *
1213 */
1214 static int w83977af_net_close(struct net_device *dev)
1215 {
1216 struct w83977af_ir *self;
1217 int iobase;
1218 __u8 set;
1219
1220 IRDA_DEBUG(0, "%s()\n", __func__ );
1221
1222 IRDA_ASSERT(dev != NULL, return -1;);
1223
1224 self = netdev_priv(dev);
1225
1226 IRDA_ASSERT(self != NULL, return 0;);
1227
1228 iobase = self->io.fir_base;
1229
1230 /* Stop device */
1231 netif_stop_queue(dev);
1232
1233 /* Stop and remove instance of IrLAP */
1234 if (self->irlap)
1235 irlap_close(self->irlap);
1236 self->irlap = NULL;
1237
1238 disable_dma(self->io.dma);
1239
1240 /* Save current set */
1241 set = inb(iobase+SSR);
1242
1243 /* Disable interrupts */
1244 switch_bank(iobase, SET0);
1245 outb(0, iobase+ICR);
1246
1247 free_irq(self->io.irq, dev);
1248 free_dma(self->io.dma);
1249
1250 /* Restore bank register */
1251 outb(set, iobase+SSR);
1252
1253 return 0;
1254 }
1255
1256 /*
1257 * Function w83977af_net_ioctl (dev, rq, cmd)
1258 *
1259 * Process IOCTL commands for this device
1260 *
1261 */
1262 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1263 {
1264 struct if_irda_req *irq = (struct if_irda_req *) rq;
1265 struct w83977af_ir *self;
1266 unsigned long flags;
1267 int ret = 0;
1268
1269 IRDA_ASSERT(dev != NULL, return -1;);
1270
1271 self = netdev_priv(dev);
1272
1273 IRDA_ASSERT(self != NULL, return -1;);
1274
1275 IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __func__ , dev->name, cmd);
1276
1277 spin_lock_irqsave(&self->lock, flags);
1278
1279 switch (cmd) {
1280 case SIOCSBANDWIDTH: /* Set bandwidth */
1281 if (!capable(CAP_NET_ADMIN)) {
1282 ret = -EPERM;
1283 goto out;
1284 }
1285 w83977af_change_speed(self, irq->ifr_baudrate);
1286 break;
1287 case SIOCSMEDIABUSY: /* Set media busy */
1288 if (!capable(CAP_NET_ADMIN)) {
1289 ret = -EPERM;
1290 goto out;
1291 }
1292 irda_device_set_media_busy(self->netdev, TRUE);
1293 break;
1294 case SIOCGRECEIVING: /* Check if we are receiving right now */
1295 irq->ifr_receiving = w83977af_is_receiving(self);
1296 break;
1297 default:
1298 ret = -EOPNOTSUPP;
1299 }
1300 out:
1301 spin_unlock_irqrestore(&self->lock, flags);
1302 return ret;
1303 }
1304
1305 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1306 MODULE_DESCRIPTION("Winbond W83977AF IrDA Device Driver");
1307 MODULE_LICENSE("GPL");
1308
1309
1310 module_param(qos_mtt_bits, int, 0);
1311 MODULE_PARM_DESC(qos_mtt_bits, "Mimimum Turn Time");
1312 module_param_array(io, int, NULL, 0);
1313 MODULE_PARM_DESC(io, "Base I/O addresses");
1314 module_param_array(irq, int, NULL, 0);
1315 MODULE_PARM_DESC(irq, "IRQ lines");
1316
1317 /*
1318 * Function init_module (void)
1319 *
1320 *
1321 *
1322 */
1323 module_init(w83977af_init);
1324
1325 /*
1326 * Function cleanup_module (void)
1327 *
1328 *
1329 *
1330 */
1331 module_exit(w83977af_cleanup);