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net: trans_start cleanups
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / irda / w83977af_ir.c
blob1f9c3f08d1a3c0f35f6318daa2d5c992fc9025b3
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/rtnetlink.h>
51 #include <linux/dma-mapping.h>
52 #include <linux/gfp.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 #define CONFIG_USE_W977_PNP /* Currently needed */
69 #define PIO_MAX_SPEED 115200
70
71 static char *driver_name = "w83977af_ir";
72 static int qos_mtt_bits = 0x07; /* 1 ms or more */
73
74 #define CHIP_IO_EXTENT 8
75
76 static unsigned int io[] = { 0x180, ~0, ~0, ~0 };
77 #ifdef CONFIG_ARCH_NETWINDER /* Adjust to NetWinder differences */
78 static unsigned int irq[] = { 6, 0, 0, 0 };
79 #else
80 static unsigned int irq[] = { 11, 0, 0, 0 };
81 #endif
82 static unsigned int dma[] = { 1, 0, 0, 0 };
83 static unsigned int efbase[] = { W977_EFIO_BASE, W977_EFIO2_BASE };
84 static unsigned int efio = W977_EFIO_BASE;
85
86 static struct w83977af_ir *dev_self[] = { NULL, NULL, NULL, NULL};
87
88 /* Some prototypes */
89 static int w83977af_open(int i, unsigned int iobase, unsigned int irq,
90 unsigned int dma);
91 static int w83977af_close(struct w83977af_ir *self);
92 static int w83977af_probe(int iobase, int irq, int dma);
93 static int w83977af_dma_receive(struct w83977af_ir *self);
94 static int w83977af_dma_receive_complete(struct w83977af_ir *self);
95 static netdev_tx_t w83977af_hard_xmit(struct sk_buff *skb,
96 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
106 /*
107 * Function w83977af_init ()
108 *
109 * Initialize chip. Just try to find out how many chips we are dealing with
110 * and where they are
111 */
112 static int __init w83977af_init(void)
113 {
114 int i;
115
116 IRDA_DEBUG(0, "%s()\n", __func__ );
117
118 for (i=0; i < ARRAY_SIZE(dev_self) && io[i] < 2000; i++) {
119 if (w83977af_open(i, io[i], irq[i], dma[i]) == 0)
120 return 0;
121 }
122 return -ENODEV;
123 }
124
125 /*
126 * Function w83977af_cleanup ()
127 *
128 * Close all configured chips
129 *
130 */
131 static void __exit w83977af_cleanup(void)
132 {
133 int i;
134
135 IRDA_DEBUG(4, "%s()\n", __func__ );
136
137 for (i=0; i < ARRAY_SIZE(dev_self); i++) {
138 if (dev_self[i])
139 w83977af_close(dev_self[i]);
140 }
141 }
142
143 static const struct net_device_ops w83977_netdev_ops = {
144 .ndo_open = w83977af_net_open,
145 .ndo_stop = w83977af_net_close,
146 .ndo_start_xmit = w83977af_hard_xmit,
147 .ndo_do_ioctl = w83977af_net_ioctl,
148 };
149
150 /*
151 * Function w83977af_open (iobase, irq)
152 *
153 * Open driver instance
154 *
155 */
156 static int w83977af_open(int i, unsigned int iobase, unsigned int irq,
157 unsigned int dma)
158 {
159 struct net_device *dev;
160 struct w83977af_ir *self;
161 int err;
162
163 IRDA_DEBUG(0, "%s()\n", __func__ );
164
165 /* Lock the port that we need */
166 if (!request_region(iobase, CHIP_IO_EXTENT, driver_name)) {
167 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
168 __func__ , iobase);
169 return -ENODEV;
170 }
171
172 if (w83977af_probe(iobase, irq, dma) == -1) {
173 err = -1;
174 goto err_out;
175 }
176 /*
177 * Allocate new instance of the driver
178 */
179 dev = alloc_irdadev(sizeof(struct w83977af_ir));
180 if (dev == NULL) {
181 printk( KERN_ERR "IrDA: Can't allocate memory for "
182 "IrDA control block!\n");
183 err = -ENOMEM;
184 goto err_out;
185 }
186
187 self = netdev_priv(dev);
188 spin_lock_init(&self->lock);
189
190
191 /* Initialize IO */
192 self->io.fir_base = iobase;
193 self->io.irq = irq;
194 self->io.fir_ext = CHIP_IO_EXTENT;
195 self->io.dma = dma;
196 self->io.fifo_size = 32;
197
198 /* Initialize QoS for this device */
199 irda_init_max_qos_capabilies(&self->qos);
200
201 /* The only value we must override it the baudrate */
202
203 /* FIXME: The HP HDLS-1100 does not support 1152000! */
204 self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
205 IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);
206
207 /* The HP HDLS-1100 needs 1 ms according to the specs */
208 self->qos.min_turn_time.bits = qos_mtt_bits;
209 irda_qos_bits_to_value(&self->qos);
210
211 /* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
212 self->rx_buff.truesize = 14384;
213 self->tx_buff.truesize = 4000;
214
215 /* Allocate memory if needed */
216 self->rx_buff.head =
217 dma_alloc_coherent(NULL, self->rx_buff.truesize,
218 &self->rx_buff_dma, GFP_KERNEL);
219 if (self->rx_buff.head == NULL) {
220 err = -ENOMEM;
221 goto err_out1;
222 }
223
224 memset(self->rx_buff.head, 0, self->rx_buff.truesize);
225
226 self->tx_buff.head =
227 dma_alloc_coherent(NULL, self->tx_buff.truesize,
228 &self->tx_buff_dma, GFP_KERNEL);
229 if (self->tx_buff.head == NULL) {
230 err = -ENOMEM;
231 goto err_out2;
232 }
233 memset(self->tx_buff.head, 0, self->tx_buff.truesize);
234
235 self->rx_buff.in_frame = FALSE;
236 self->rx_buff.state = OUTSIDE_FRAME;
237 self->tx_buff.data = self->tx_buff.head;
238 self->rx_buff.data = self->rx_buff.head;
239 self->netdev = dev;
240
241 dev->netdev_ops = &w83977_netdev_ops;
242
243 err = register_netdev(dev);
244 if (err) {
245 IRDA_ERROR("%s(), register_netdevice() failed!\n", __func__);
246 goto err_out3;
247 }
248 IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
249
250 /* Need to store self somewhere */
251 dev_self[i] = self;
252
253 return 0;
254 err_out3:
255 dma_free_coherent(NULL, self->tx_buff.truesize,
256 self->tx_buff.head, self->tx_buff_dma);
257 err_out2:
258 dma_free_coherent(NULL, self->rx_buff.truesize,
259 self->rx_buff.head, self->rx_buff_dma);
260 err_out1:
261 free_netdev(dev);
262 err_out:
263 release_region(iobase, CHIP_IO_EXTENT);
264 return err;
265 }
266
267 /*
268 * Function w83977af_close (self)
269 *
270 * Close driver instance
271 *
272 */
273 static int w83977af_close(struct w83977af_ir *self)
274 {
275 int iobase;
276
277 IRDA_DEBUG(0, "%s()\n", __func__ );
278
279 iobase = self->io.fir_base;
280
281 #ifdef CONFIG_USE_W977_PNP
282 /* enter PnP configuration mode */
283 w977_efm_enter(efio);
284
285 w977_select_device(W977_DEVICE_IR, efio);
286
287 /* Deactivate device */
288 w977_write_reg(0x30, 0x00, efio);
289
290 w977_efm_exit(efio);
291 #endif /* CONFIG_USE_W977_PNP */
292
293 /* Remove netdevice */
294 unregister_netdev(self->netdev);
295
296 /* Release the PORT that this driver is using */
297 IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
298 __func__ , self->io.fir_base);
299 release_region(self->io.fir_base, self->io.fir_ext);
300
301 if (self->tx_buff.head)
302 dma_free_coherent(NULL, self->tx_buff.truesize,
303 self->tx_buff.head, self->tx_buff_dma);
304
305 if (self->rx_buff.head)
306 dma_free_coherent(NULL, self->rx_buff.truesize,
307 self->rx_buff.head, self->rx_buff_dma);
308
309 free_netdev(self->netdev);
310
311 return 0;
312 }
313
314 static int w83977af_probe(int iobase, int irq, int dma)
315 {
316 int version;
317 int i;
318
319 for (i=0; i < 2; i++) {
320 IRDA_DEBUG( 0, "%s()\n", __func__ );
321 #ifdef CONFIG_USE_W977_PNP
322 /* Enter PnP configuration mode */
323 w977_efm_enter(efbase[i]);
324
325 w977_select_device(W977_DEVICE_IR, efbase[i]);
326
327 /* Configure PnP port, IRQ, and DMA channel */
328 w977_write_reg(0x60, (iobase >> 8) & 0xff, efbase[i]);
329 w977_write_reg(0x61, (iobase) & 0xff, efbase[i]);
330
331 w977_write_reg(0x70, irq, efbase[i]);
332 #ifdef CONFIG_ARCH_NETWINDER
333 /* Netwinder uses 1 higher than Linux */
334 w977_write_reg(0x74, dma+1, efbase[i]);
335 #else
336 w977_write_reg(0x74, dma, efbase[i]);
337 #endif /*CONFIG_ARCH_NETWINDER */
338 w977_write_reg(0x75, 0x04, efbase[i]); /* Disable Tx DMA */
339
340 /* Set append hardware CRC, enable IR bank selection */
341 w977_write_reg(0xf0, APEDCRC|ENBNKSEL, efbase[i]);
342
343 /* Activate device */
344 w977_write_reg(0x30, 0x01, efbase[i]);
345
346 w977_efm_exit(efbase[i]);
347 #endif /* CONFIG_USE_W977_PNP */
348 /* Disable Advanced mode */
349 switch_bank(iobase, SET2);
350 outb(iobase+2, 0x00);
351
352 /* Turn on UART (global) interrupts */
353 switch_bank(iobase, SET0);
354 outb(HCR_EN_IRQ, iobase+HCR);
355
356 /* Switch to advanced mode */
357 switch_bank(iobase, SET2);
358 outb(inb(iobase+ADCR1) | ADCR1_ADV_SL, iobase+ADCR1);
359
360 /* Set default IR-mode */
361 switch_bank(iobase, SET0);
362 outb(HCR_SIR, iobase+HCR);
363
364 /* Read the Advanced IR ID */
365 switch_bank(iobase, SET3);
366 version = inb(iobase+AUID);
367
368 /* Should be 0x1? */
369 if (0x10 == (version & 0xf0)) {
370 efio = efbase[i];
371
372 /* Set FIFO size to 32 */
373 switch_bank(iobase, SET2);
374 outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
375
376 /* Set FIFO threshold to TX17, RX16 */
377 switch_bank(iobase, SET0);
378 outb(UFR_RXTL|UFR_TXTL|UFR_TXF_RST|UFR_RXF_RST|
379 UFR_EN_FIFO,iobase+UFR);
380
381 /* Receiver frame length */
382 switch_bank(iobase, SET4);
383 outb(2048 & 0xff, iobase+6);
384 outb((2048 >> 8) & 0x1f, iobase+7);
385
386 /*
387 * Init HP HSDL-1100 transceiver.
388 *
389 * Set IRX_MSL since we have 2 * receive paths IRRX,
390 * and IRRXH. Clear IRSL0D since we want IRSL0 * to
391 * be a input pin used for IRRXH
392 *
393 * IRRX pin 37 connected to receiver
394 * IRTX pin 38 connected to transmitter
395 * FIRRX pin 39 connected to receiver (IRSL0)
396 * CIRRX pin 40 connected to pin 37
397 */
398 switch_bank(iobase, SET7);
399 outb(0x40, iobase+7);
400
401 IRDA_MESSAGE("W83977AF (IR) driver loaded. "
402 "Version: 0x%02x\n", version);
403
404 return 0;
405 } else {
406 /* Try next extented function register address */
407 IRDA_DEBUG( 0, "%s(), Wrong chip version", __func__ );
408 }
409 }
410 return -1;
411 }
412
413 static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed)
414 {
415 int ir_mode = HCR_SIR;
416 int iobase;
417 __u8 set;
418
419 iobase = self->io.fir_base;
420
421 /* Update accounting for new speed */
422 self->io.speed = speed;
423
424 /* Save current bank */
425 set = inb(iobase+SSR);
426
427 /* Disable interrupts */
428 switch_bank(iobase, SET0);
429 outb(0, iobase+ICR);
430
431 /* Select Set 2 */
432 switch_bank(iobase, SET2);
433 outb(0x00, iobase+ABHL);
434
435 switch (speed) {
436 case 9600: outb(0x0c, iobase+ABLL); break;
437 case 19200: outb(0x06, iobase+ABLL); break;
438 case 38400: outb(0x03, iobase+ABLL); break;
439 case 57600: outb(0x02, iobase+ABLL); break;
440 case 115200: outb(0x01, iobase+ABLL); break;
441 case 576000:
442 ir_mode = HCR_MIR_576;
443 IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __func__ );
444 break;
445 case 1152000:
446 ir_mode = HCR_MIR_1152;
447 IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __func__ );
448 break;
449 case 4000000:
450 ir_mode = HCR_FIR;
451 IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __func__ );
452 break;
453 default:
454 ir_mode = HCR_FIR;
455 IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n", __func__ , speed);
456 break;
457 }
458
459 /* Set speed mode */
460 switch_bank(iobase, SET0);
461 outb(ir_mode, iobase+HCR);
462
463 /* set FIFO size to 32 */
464 switch_bank(iobase, SET2);
465 outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
466
467 /* set FIFO threshold to TX17, RX16 */
468 switch_bank(iobase, SET0);
469 outb(0x00, iobase+UFR); /* Reset */
470 outb(UFR_EN_FIFO, iobase+UFR); /* First we must enable FIFO */
471 outb(0xa7, iobase+UFR);
472
473 netif_wake_queue(self->netdev);
474
475 /* Enable some interrupts so we can receive frames */
476 switch_bank(iobase, SET0);
477 if (speed > PIO_MAX_SPEED) {
478 outb(ICR_EFSFI, iobase+ICR);
479 w83977af_dma_receive(self);
480 } else
481 outb(ICR_ERBRI, iobase+ICR);
482
483 /* Restore SSR */
484 outb(set, iobase+SSR);
485 }
486
487 /*
488 * Function w83977af_hard_xmit (skb, dev)
489 *
490 * Sets up a DMA transfer to send the current frame.
491 *
492 */
493 static netdev_tx_t w83977af_hard_xmit(struct sk_buff *skb,
494 struct net_device *dev)
495 {
496 struct w83977af_ir *self;
497 __s32 speed;
498 int iobase;
499 __u8 set;
500 int mtt;
501
502 self = netdev_priv(dev);
503
504 iobase = self->io.fir_base;
505
506 IRDA_DEBUG(4, "%s(%ld), skb->len=%d\n", __func__ , jiffies,
507 (int) skb->len);
508
509 /* Lock transmit buffer */
510 netif_stop_queue(dev);
511
512 /* Check if we need to change the speed */
513 speed = irda_get_next_speed(skb);
514 if ((speed != self->io.speed) && (speed != -1)) {
515 /* Check for empty frame */
516 if (!skb->len) {
517 w83977af_change_speed(self, speed);
518 dev_kfree_skb(skb);
519 return NETDEV_TX_OK;
520 } else
521 self->new_speed = speed;
522 }
523
524 /* Save current set */
525 set = inb(iobase+SSR);
526
527 /* Decide if we should use PIO or DMA transfer */
528 if (self->io.speed > PIO_MAX_SPEED) {
529 self->tx_buff.data = self->tx_buff.head;
530 skb_copy_from_linear_data(skb, self->tx_buff.data, skb->len);
531 self->tx_buff.len = skb->len;
532
533 mtt = irda_get_mtt(skb);
534 IRDA_DEBUG(4, "%s(%ld), mtt=%d\n", __func__ , jiffies, mtt);
535 if (mtt)
536 udelay(mtt);
537
538 /* Enable DMA interrupt */
539 switch_bank(iobase, SET0);
540 outb(ICR_EDMAI, iobase+ICR);
541 w83977af_dma_write(self, iobase);
542 } else {
543 self->tx_buff.data = self->tx_buff.head;
544 self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
545 self->tx_buff.truesize);
546
547 /* Add interrupt on tx low level (will fire immediately) */
548 switch_bank(iobase, SET0);
549 outb(ICR_ETXTHI, iobase+ICR);
550 }
551 dev_kfree_skb(skb);
552
553 /* Restore set register */
554 outb(set, iobase+SSR);
555
556 return NETDEV_TX_OK;
557 }
558
559 /*
560 * Function w83977af_dma_write (self, iobase)
561 *
562 * Send frame using DMA
563 *
564 */
565 static void w83977af_dma_write(struct w83977af_ir *self, int iobase)
566 {
567 __u8 set;
568 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
569 unsigned long flags;
570 __u8 hcr;
571 #endif
572 IRDA_DEBUG(4, "%s(), len=%d\n", __func__ , self->tx_buff.len);
573
574 /* Save current set */
575 set = inb(iobase+SSR);
576
577 /* Disable DMA */
578 switch_bank(iobase, SET0);
579 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
580
581 /* Choose transmit DMA channel */
582 switch_bank(iobase, SET2);
583 outb(ADCR1_D_CHSW|/*ADCR1_DMA_F|*/ADCR1_ADV_SL, iobase+ADCR1);
584 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
585 spin_lock_irqsave(&self->lock, flags);
586
587 disable_dma(self->io.dma);
588 clear_dma_ff(self->io.dma);
589 set_dma_mode(self->io.dma, DMA_MODE_READ);
590 set_dma_addr(self->io.dma, self->tx_buff_dma);
591 set_dma_count(self->io.dma, self->tx_buff.len);
592 #else
593 irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
594 DMA_MODE_WRITE);
595 #endif
596 self->io.direction = IO_XMIT;
597
598 /* Enable DMA */
599 switch_bank(iobase, SET0);
600 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
601 hcr = inb(iobase+HCR);
602 outb(hcr | HCR_EN_DMA, iobase+HCR);
603 enable_dma(self->io.dma);
604 spin_unlock_irqrestore(&self->lock, flags);
605 #else
606 outb(inb(iobase+HCR) | HCR_EN_DMA | HCR_TX_WT, iobase+HCR);
607 #endif
608
609 /* Restore set register */
610 outb(set, iobase+SSR);
611 }
612
613 /*
614 * Function w83977af_pio_write (iobase, buf, len, fifo_size)
615 *
616 *
617 *
618 */
619 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
620 {
621 int actual = 0;
622 __u8 set;
623
624 IRDA_DEBUG(4, "%s()\n", __func__ );
625
626 /* Save current bank */
627 set = inb(iobase+SSR);
628
629 switch_bank(iobase, SET0);
630 if (!(inb_p(iobase+USR) & USR_TSRE)) {
631 IRDA_DEBUG(4,
632 "%s(), warning, FIFO not empty yet!\n", __func__ );
633
634 fifo_size -= 17;
635 IRDA_DEBUG(4, "%s(), %d bytes left in tx fifo\n",
636 __func__ , fifo_size);
637 }
638
639 /* Fill FIFO with current frame */
640 while ((fifo_size-- > 0) && (actual < len)) {
641 /* Transmit next byte */
642 outb(buf[actual++], iobase+TBR);
643 }
644
645 IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n",
646 __func__ , fifo_size, actual, len);
647
648 /* Restore bank */
649 outb(set, iobase+SSR);
650
651 return actual;
652 }
653
654 /*
655 * Function w83977af_dma_xmit_complete (self)
656 *
657 * The transfer of a frame in finished. So do the necessary things
658 *
659 *
660 */
661 static void w83977af_dma_xmit_complete(struct w83977af_ir *self)
662 {
663 int iobase;
664 __u8 set;
665
666 IRDA_DEBUG(4, "%s(%ld)\n", __func__ , jiffies);
667
668 IRDA_ASSERT(self != NULL, return;);
669
670 iobase = self->io.fir_base;
671
672 /* Save current set */
673 set = inb(iobase+SSR);
674
675 /* Disable DMA */
676 switch_bank(iobase, SET0);
677 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
678
679 /* Check for underrrun! */
680 if (inb(iobase+AUDR) & AUDR_UNDR) {
681 IRDA_DEBUG(0, "%s(), Transmit underrun!\n", __func__ );
682
683 self->netdev->stats.tx_errors++;
684 self->netdev->stats.tx_fifo_errors++;
685
686 /* Clear bit, by writing 1 to it */
687 outb(AUDR_UNDR, iobase+AUDR);
688 } else
689 self->netdev->stats.tx_packets++;
690
691
692 if (self->new_speed) {
693 w83977af_change_speed(self, self->new_speed);
694 self->new_speed = 0;
695 }
696
697 /* Unlock tx_buff and request another frame */
698 /* Tell the network layer, that we want more frames */
699 netif_wake_queue(self->netdev);
700
701 /* Restore set */
702 outb(set, iobase+SSR);
703 }
704
705 /*
706 * Function w83977af_dma_receive (self)
707 *
708 * Get ready for receiving a frame. The device will initiate a DMA
709 * if it starts to receive a frame.
710 *
711 */
712 static int w83977af_dma_receive(struct w83977af_ir *self)
713 {
714 int iobase;
715 __u8 set;
716 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
717 unsigned long flags;
718 __u8 hcr;
719 #endif
720 IRDA_ASSERT(self != NULL, return -1;);
721
722 IRDA_DEBUG(4, "%s\n", __func__ );
723
724 iobase= self->io.fir_base;
725
726 /* Save current set */
727 set = inb(iobase+SSR);
728
729 /* Disable DMA */
730 switch_bank(iobase, SET0);
731 outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
732
733 /* Choose DMA Rx, DMA Fairness, and Advanced mode */
734 switch_bank(iobase, SET2);
735 outb((inb(iobase+ADCR1) & ~ADCR1_D_CHSW)/*|ADCR1_DMA_F*/|ADCR1_ADV_SL,
736 iobase+ADCR1);
737
738 self->io.direction = IO_RECV;
739 self->rx_buff.data = self->rx_buff.head;
740
741 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
742 spin_lock_irqsave(&self->lock, flags);
743
744 disable_dma(self->io.dma);
745 clear_dma_ff(self->io.dma);
746 set_dma_mode(self->io.dma, DMA_MODE_READ);
747 set_dma_addr(self->io.dma, self->rx_buff_dma);
748 set_dma_count(self->io.dma, self->rx_buff.truesize);
749 #else
750 irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
751 DMA_MODE_READ);
752 #endif
753 /*
754 * Reset Rx FIFO. This will also flush the ST_FIFO, it's very
755 * important that we don't reset the Tx FIFO since it might not
756 * be finished transmitting yet
757 */
758 switch_bank(iobase, SET0);
759 outb(UFR_RXTL|UFR_TXTL|UFR_RXF_RST|UFR_EN_FIFO, iobase+UFR);
760 self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
761
762 /* Enable DMA */
763 switch_bank(iobase, SET0);
764 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
765 hcr = inb(iobase+HCR);
766 outb(hcr | HCR_EN_DMA, iobase+HCR);
767 enable_dma(self->io.dma);
768 spin_unlock_irqrestore(&self->lock, flags);
769 #else
770 outb(inb(iobase+HCR) | HCR_EN_DMA, iobase+HCR);
771 #endif
772 /* Restore set */
773 outb(set, iobase+SSR);
774
775 return 0;
776 }
777
778 /*
779 * Function w83977af_receive_complete (self)
780 *
781 * Finished with receiving a frame
782 *
783 */
784 static int w83977af_dma_receive_complete(struct w83977af_ir *self)
785 {
786 struct sk_buff *skb;
787 struct st_fifo *st_fifo;
788 int len;
789 int iobase;
790 __u8 set;
791 __u8 status;
792
793 IRDA_DEBUG(4, "%s\n", __func__ );
794
795 st_fifo = &self->st_fifo;
796
797 iobase = self->io.fir_base;
798
799 /* Save current set */
800 set = inb(iobase+SSR);
801
802 iobase = self->io.fir_base;
803
804 /* Read status FIFO */
805 switch_bank(iobase, SET5);
806 while ((status = inb(iobase+FS_FO)) & FS_FO_FSFDR) {
807 st_fifo->entries[st_fifo->tail].status = status;
808
809 st_fifo->entries[st_fifo->tail].len = inb(iobase+RFLFL);
810 st_fifo->entries[st_fifo->tail].len |= inb(iobase+RFLFH) << 8;
811
812 st_fifo->tail++;
813 st_fifo->len++;
814 }
815
816 while (st_fifo->len) {
817 /* Get first entry */
818 status = st_fifo->entries[st_fifo->head].status;
819 len = st_fifo->entries[st_fifo->head].len;
820 st_fifo->head++;
821 st_fifo->len--;
822
823 /* Check for errors */
824 if (status & FS_FO_ERR_MSK) {
825 if (status & FS_FO_LST_FR) {
826 /* Add number of lost frames to stats */
827 self->netdev->stats.rx_errors += len;
828 } else {
829 /* Skip frame */
830 self->netdev->stats.rx_errors++;
831
832 self->rx_buff.data += len;
833
834 if (status & FS_FO_MX_LEX)
835 self->netdev->stats.rx_length_errors++;
836
837 if (status & FS_FO_PHY_ERR)
838 self->netdev->stats.rx_frame_errors++;
839
840 if (status & FS_FO_CRC_ERR)
841 self->netdev->stats.rx_crc_errors++;
842 }
843 /* The errors below can be reported in both cases */
844 if (status & FS_FO_RX_OV)
845 self->netdev->stats.rx_fifo_errors++;
846
847 if (status & FS_FO_FSF_OV)
848 self->netdev->stats.rx_fifo_errors++;
849
850 } else {
851 /* Check if we have transferred all data to memory */
852 switch_bank(iobase, SET0);
853 if (inb(iobase+USR) & USR_RDR) {
854 udelay(80); /* Should be enough!? */
855 }
856
857 skb = dev_alloc_skb(len+1);
858 if (skb == NULL) {
859 printk(KERN_INFO
860 "%s(), memory squeeze, dropping frame.\n", __func__);
861 /* Restore set register */
862 outb(set, iobase+SSR);
863
864 return FALSE;
865 }
866
867 /* Align to 20 bytes */
868 skb_reserve(skb, 1);
869
870 /* Copy frame without CRC */
871 if (self->io.speed < 4000000) {
872 skb_put(skb, len-2);
873 skb_copy_to_linear_data(skb,
874 self->rx_buff.data,
875 len - 2);
876 } else {
877 skb_put(skb, len-4);
878 skb_copy_to_linear_data(skb,
879 self->rx_buff.data,
880 len - 4);
881 }
882
883 /* Move to next frame */
884 self->rx_buff.data += len;
885 self->netdev->stats.rx_packets++;
886
887 skb->dev = self->netdev;
888 skb_reset_mac_header(skb);
889 skb->protocol = htons(ETH_P_IRDA);
890 netif_rx(skb);
891 }
892 }
893 /* Restore set register */
894 outb(set, iobase+SSR);
895
896 return TRUE;
897 }
898
899 /*
900 * Function pc87108_pio_receive (self)
901 *
902 * Receive all data in receiver FIFO
903 *
904 */
905 static void w83977af_pio_receive(struct w83977af_ir *self)
906 {
907 __u8 byte = 0x00;
908 int iobase;
909
910 IRDA_DEBUG(4, "%s()\n", __func__ );
911
912 IRDA_ASSERT(self != NULL, return;);
913
914 iobase = self->io.fir_base;
915
916 /* Receive all characters in Rx FIFO */
917 do {
918 byte = inb(iobase+RBR);
919 async_unwrap_char(self->netdev, &self->netdev->stats, &self->rx_buff,
920 byte);
921 } while (inb(iobase+USR) & USR_RDR); /* Data available */
922 }
923
924 /*
925 * Function w83977af_sir_interrupt (self, eir)
926 *
927 * Handle SIR interrupt
928 *
929 */
930 static __u8 w83977af_sir_interrupt(struct w83977af_ir *self, int isr)
931 {
932 int actual;
933 __u8 new_icr = 0;
934 __u8 set;
935 int iobase;
936
937 IRDA_DEBUG(4, "%s(), isr=%#x\n", __func__ , isr);
938
939 iobase = self->io.fir_base;
940 /* Transmit FIFO low on data */
941 if (isr & ISR_TXTH_I) {
942 /* Write data left in transmit buffer */
943 actual = w83977af_pio_write(self->io.fir_base,
944 self->tx_buff.data,
945 self->tx_buff.len,
946 self->io.fifo_size);
947
948 self->tx_buff.data += actual;
949 self->tx_buff.len -= actual;
950
951 self->io.direction = IO_XMIT;
952
953 /* Check if finished */
954 if (self->tx_buff.len > 0) {
955 new_icr |= ICR_ETXTHI;
956 } else {
957 set = inb(iobase+SSR);
958 switch_bank(iobase, SET0);
959 outb(AUDR_SFEND, iobase+AUDR);
960 outb(set, iobase+SSR);
961
962 self->netdev->stats.tx_packets++;
963
964 /* Feed me more packets */
965 netif_wake_queue(self->netdev);
966 new_icr |= ICR_ETBREI;
967 }
968 }
969 /* Check if transmission has completed */
970 if (isr & ISR_TXEMP_I) {
971 /* Check if we need to change the speed? */
972 if (self->new_speed) {
973 IRDA_DEBUG(2,
974 "%s(), Changing speed!\n", __func__ );
975 w83977af_change_speed(self, self->new_speed);
976 self->new_speed = 0;
977 }
978
979 /* Turn around and get ready to receive some data */
980 self->io.direction = IO_RECV;
981 new_icr |= ICR_ERBRI;
982 }
983
984 /* Rx FIFO threshold or timeout */
985 if (isr & ISR_RXTH_I) {
986 w83977af_pio_receive(self);
987
988 /* Keep receiving */
989 new_icr |= ICR_ERBRI;
990 }
991 return new_icr;
992 }
993
994 /*
995 * Function pc87108_fir_interrupt (self, eir)
996 *
997 * Handle MIR/FIR interrupt
998 *
999 */
1000 static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
1001 {
1002 __u8 new_icr = 0;
1003 __u8 set;
1004 int iobase;
1005
1006 iobase = self->io.fir_base;
1007 set = inb(iobase+SSR);
1008
1009 /* End of frame detected in FIFO */
1010 if (isr & (ISR_FEND_I|ISR_FSF_I)) {
1011 if (w83977af_dma_receive_complete(self)) {
1012
1013 /* Wait for next status FIFO interrupt */
1014 new_icr |= ICR_EFSFI;
1015 } else {
1016 /* DMA not finished yet */
1017
1018 /* Set timer value, resolution 1 ms */
1019 switch_bank(iobase, SET4);
1020 outb(0x01, iobase+TMRL); /* 1 ms */
1021 outb(0x00, iobase+TMRH);
1022
1023 /* Start timer */
1024 outb(IR_MSL_EN_TMR, iobase+IR_MSL);
1025
1026 new_icr |= ICR_ETMRI;
1027 }
1028 }
1029 /* Timer finished */
1030 if (isr & ISR_TMR_I) {
1031 /* Disable timer */
1032 switch_bank(iobase, SET4);
1033 outb(0, iobase+IR_MSL);
1034
1035 /* Clear timer event */
1036 /* switch_bank(iobase, SET0); */
1037 /* outb(ASCR_CTE, iobase+ASCR); */
1038
1039 /* Check if this is a TX timer interrupt */
1040 if (self->io.direction == IO_XMIT) {
1041 w83977af_dma_write(self, iobase);
1042
1043 new_icr |= ICR_EDMAI;
1044 } else {
1045 /* Check if DMA has now finished */
1046 w83977af_dma_receive_complete(self);
1047
1048 new_icr |= ICR_EFSFI;
1049 }
1050 }
1051 /* Finished with DMA */
1052 if (isr & ISR_DMA_I) {
1053 w83977af_dma_xmit_complete(self);
1054
1055 /* Check if there are more frames to be transmitted */
1056 /* if (irda_device_txqueue_empty(self)) { */
1057
1058 /* Prepare for receive
1059 *
1060 * ** Netwinder Tx DMA likes that we do this anyway **
1061 */
1062 w83977af_dma_receive(self);
1063 new_icr = ICR_EFSFI;
1064 /* } */
1065 }
1066
1067 /* Restore set */
1068 outb(set, iobase+SSR);
1069
1070 return new_icr;
1071 }
1072
1073 /*
1074 * Function w83977af_interrupt (irq, dev_id, regs)
1075 *
1076 * An interrupt from the chip has arrived. Time to do some work
1077 *
1078 */
1079 static irqreturn_t w83977af_interrupt(int irq, void *dev_id)
1080 {
1081 struct net_device *dev = dev_id;
1082 struct w83977af_ir *self;
1083 __u8 set, icr, isr;
1084 int iobase;
1085
1086 self = netdev_priv(dev);
1087
1088 iobase = self->io.fir_base;
1089
1090 /* Save current bank */
1091 set = inb(iobase+SSR);
1092 switch_bank(iobase, SET0);
1093
1094 icr = inb(iobase+ICR);
1095 isr = inb(iobase+ISR) & icr; /* Mask out the interesting ones */
1096
1097 outb(0, iobase+ICR); /* Disable interrupts */
1098
1099 if (isr) {
1100 /* Dispatch interrupt handler for the current speed */
1101 if (self->io.speed > PIO_MAX_SPEED )
1102 icr = w83977af_fir_interrupt(self, isr);
1103 else
1104 icr = w83977af_sir_interrupt(self, isr);
1105 }
1106
1107 outb(icr, iobase+ICR); /* Restore (new) interrupts */
1108 outb(set, iobase+SSR); /* Restore bank register */
1109 return IRQ_RETVAL(isr);
1110 }
1111
1112 /*
1113 * Function w83977af_is_receiving (self)
1114 *
1115 * Return TRUE is we are currently receiving a frame
1116 *
1117 */
1118 static int w83977af_is_receiving(struct w83977af_ir *self)
1119 {
1120 int status = FALSE;
1121 int iobase;
1122 __u8 set;
1123
1124 IRDA_ASSERT(self != NULL, return FALSE;);
1125
1126 if (self->io.speed > 115200) {
1127 iobase = self->io.fir_base;
1128
1129 /* Check if rx FIFO is not empty */
1130 set = inb(iobase+SSR);
1131 switch_bank(iobase, SET2);
1132 if ((inb(iobase+RXFDTH) & 0x3f) != 0) {
1133 /* We are receiving something */
1134 status = TRUE;
1135 }
1136 outb(set, iobase+SSR);
1137 } else
1138 status = (self->rx_buff.state != OUTSIDE_FRAME);
1139
1140 return status;
1141 }
1142
1143 /*
1144 * Function w83977af_net_open (dev)
1145 *
1146 * Start the device
1147 *
1148 */
1149 static int w83977af_net_open(struct net_device *dev)
1150 {
1151 struct w83977af_ir *self;
1152 int iobase;
1153 char hwname[32];
1154 __u8 set;
1155
1156 IRDA_DEBUG(0, "%s()\n", __func__ );
1157
1158 IRDA_ASSERT(dev != NULL, return -1;);
1159 self = netdev_priv(dev);
1160
1161 IRDA_ASSERT(self != NULL, return 0;);
1162
1163 iobase = self->io.fir_base;
1164
1165 if (request_irq(self->io.irq, w83977af_interrupt, 0, dev->name,
1166 (void *) dev)) {
1167 return -EAGAIN;
1168 }
1169 /*
1170 * Always allocate the DMA channel after the IRQ,
1171 * and clean up on failure.
1172 */
1173 if (request_dma(self->io.dma, dev->name)) {
1174 free_irq(self->io.irq, self);
1175 return -EAGAIN;
1176 }
1177
1178 /* Save current set */
1179 set = inb(iobase+SSR);
1180
1181 /* Enable some interrupts so we can receive frames again */
1182 switch_bank(iobase, SET0);
1183 if (self->io.speed > 115200) {
1184 outb(ICR_EFSFI, iobase+ICR);
1185 w83977af_dma_receive(self);
1186 } else
1187 outb(ICR_ERBRI, iobase+ICR);
1188
1189 /* Restore bank register */
1190 outb(set, iobase+SSR);
1191
1192 /* Ready to play! */
1193 netif_start_queue(dev);
1194
1195 /* Give self a hardware name */
1196 sprintf(hwname, "w83977af @ 0x%03x", self->io.fir_base);
1197
1198 /*
1199 * Open new IrLAP layer instance, now that everything should be
1200 * initialized properly
1201 */
1202 self->irlap = irlap_open(dev, &self->qos, hwname);
1203
1204 return 0;
1205 }
1206
1207 /*
1208 * Function w83977af_net_close (dev)
1209 *
1210 * Stop the device
1211 *
1212 */
1213 static int w83977af_net_close(struct net_device *dev)
1214 {
1215 struct w83977af_ir *self;
1216 int iobase;
1217 __u8 set;
1218
1219 IRDA_DEBUG(0, "%s()\n", __func__ );
1220
1221 IRDA_ASSERT(dev != NULL, return -1;);
1222
1223 self = netdev_priv(dev);
1224
1225 IRDA_ASSERT(self != NULL, return 0;);
1226
1227 iobase = self->io.fir_base;
1228
1229 /* Stop device */
1230 netif_stop_queue(dev);
1231
1232 /* Stop and remove instance of IrLAP */
1233 if (self->irlap)
1234 irlap_close(self->irlap);
1235 self->irlap = NULL;
1236
1237 disable_dma(self->io.dma);
1238
1239 /* Save current set */
1240 set = inb(iobase+SSR);
1241
1242 /* Disable interrupts */
1243 switch_bank(iobase, SET0);
1244 outb(0, iobase+ICR);
1245
1246 free_irq(self->io.irq, dev);
1247 free_dma(self->io.dma);
1248
1249 /* Restore bank register */
1250 outb(set, iobase+SSR);
1251
1252 return 0;
1253 }
1254
1255 /*
1256 * Function w83977af_net_ioctl (dev, rq, cmd)
1257 *
1258 * Process IOCTL commands for this device
1259 *
1260 */
1261 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1262 {
1263 struct if_irda_req *irq = (struct if_irda_req *) rq;
1264 struct w83977af_ir *self;
1265 unsigned long flags;
1266 int ret = 0;
1267
1268 IRDA_ASSERT(dev != NULL, return -1;);
1269
1270 self = netdev_priv(dev);
1271
1272 IRDA_ASSERT(self != NULL, return -1;);
1273
1274 IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __func__ , dev->name, cmd);
1275
1276 spin_lock_irqsave(&self->lock, flags);
1277
1278 switch (cmd) {
1279 case SIOCSBANDWIDTH: /* Set bandwidth */
1280 if (!capable(CAP_NET_ADMIN)) {
1281 ret = -EPERM;
1282 goto out;
1283 }
1284 w83977af_change_speed(self, irq->ifr_baudrate);
1285 break;
1286 case SIOCSMEDIABUSY: /* Set media busy */
1287 if (!capable(CAP_NET_ADMIN)) {
1288 ret = -EPERM;
1289 goto out;
1290 }
1291 irda_device_set_media_busy(self->netdev, TRUE);
1292 break;
1293 case SIOCGRECEIVING: /* Check if we are receiving right now */
1294 irq->ifr_receiving = w83977af_is_receiving(self);
1295 break;
1296 default:
1297 ret = -EOPNOTSUPP;
1298 }
1299 out:
1300 spin_unlock_irqrestore(&self->lock, flags);
1301 return ret;
1302 }
1303
1304 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1305 MODULE_DESCRIPTION("Winbond W83977AF IrDA Device Driver");
1306 MODULE_LICENSE("GPL");
1307
1308
1309 module_param(qos_mtt_bits, int, 0);
1310 MODULE_PARM_DESC(qos_mtt_bits, "Mimimum Turn Time");
1311 module_param_array(io, int, NULL, 0);
1312 MODULE_PARM_DESC(io, "Base I/O addresses");
1313 module_param_array(irq, int, NULL, 0);
1314 MODULE_PARM_DESC(irq, "IRQ lines");
1315
1316 /*
1317 * Function init_module (void)
1318 *
1319 *
1320 *
1321 */
1322 module_init(w83977af_init);
1323
1324 /*
1325 * Function cleanup_module (void)
1326 *
1327 *
1328 *
1329 */
1330 module_exit(w83977af_cleanup);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree