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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[mirror_ubuntu-bionic-kernel.git] / drivers / net / irda / w83977af_ir.c
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
43
44 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/types.h>
47 #include <linux/skbuff.h>
48 #include <linux/netdevice.h>
49 #include <linux/ioport.h>
50 #include <linux/delay.h>
51 #include <linux/init.h>
52 #include <linux/interrupt.h>
53 #include <linux/rtnetlink.h>
54 #include <linux/dma-mapping.h>
55 #include <linux/gfp.h>
56
57 #include <asm/io.h>
58 #include <asm/dma.h>
59 #include <asm/byteorder.h>
60
61 #include <net/irda/irda.h>
62 #include <net/irda/wrapper.h>
63 #include <net/irda/irda_device.h>
64 #include "w83977af.h"
65 #include "w83977af_ir.h"
66
67 #define CONFIG_USE_W977_PNP /* Currently needed */
68 #define PIO_MAX_SPEED 115200
69
70 static char *driver_name = "w83977af_ir";
71 static int qos_mtt_bits = 0x07; /* 1 ms or more */
72
73 #define CHIP_IO_EXTENT 8
74
75 static unsigned int io[] = { 0x180, ~0, ~0, ~0 };
76 #ifdef CONFIG_ARCH_NETWINDER /* Adjust to NetWinder differences */
77 static unsigned int irq[] = { 6, 0, 0, 0 };
78 #else
79 static unsigned int irq[] = { 11, 0, 0, 0 };
80 #endif
81 static unsigned int dma[] = { 1, 0, 0, 0 };
82 static unsigned int efbase[] = { W977_EFIO_BASE, W977_EFIO2_BASE };
83 static unsigned int efio = W977_EFIO_BASE;
84
85 static struct w83977af_ir *dev_self[] = { NULL, NULL, NULL, NULL};
86
87 /* Some prototypes */
88 static int w83977af_open(int i, unsigned int iobase, unsigned int irq,
89 unsigned int dma);
90 static int w83977af_close(struct w83977af_ir *self);
91 static int w83977af_probe(int iobase, int irq, int dma);
92 static int w83977af_dma_receive(struct w83977af_ir *self);
93 static int w83977af_dma_receive_complete(struct w83977af_ir *self);
94 static netdev_tx_t w83977af_hard_xmit(struct sk_buff *skb,
95 struct net_device *dev);
96 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
97 static void w83977af_dma_write(struct w83977af_ir *self, int iobase);
98 static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed);
99 static int w83977af_is_receiving(struct w83977af_ir *self);
100
101 static int w83977af_net_open(struct net_device *dev);
102 static int w83977af_net_close(struct net_device *dev);
103 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
104
105 /*
106 * Function w83977af_init ()
107 *
108 * Initialize chip. Just try to find out how many chips we are dealing with
109 * and where they are
110 */
111 static int __init w83977af_init(void)
112 {
113 int i;
114
115 for (i = 0; i < ARRAY_SIZE(dev_self) && io[i] < 2000; i++) {
116 if (w83977af_open(i, io[i], irq[i], dma[i]) == 0)
117 return 0;
118 }
119 return -ENODEV;
120 }
121
122 /*
123 * Function w83977af_cleanup ()
124 *
125 * Close all configured chips
126 *
127 */
128 static void __exit w83977af_cleanup(void)
129 {
130 int i;
131
132 for (i = 0; i < ARRAY_SIZE(dev_self); i++) {
133 if (dev_self[i])
134 w83977af_close(dev_self[i]);
135 }
136 }
137
138 static const struct net_device_ops w83977_netdev_ops = {
139 .ndo_open = w83977af_net_open,
140 .ndo_stop = w83977af_net_close,
141 .ndo_start_xmit = w83977af_hard_xmit,
142 .ndo_do_ioctl = w83977af_net_ioctl,
143 };
144
145 /*
146 * Function w83977af_open (iobase, irq)
147 *
148 * Open driver instance
149 *
150 */
151 static int w83977af_open(int i, unsigned int iobase, unsigned int irq,
152 unsigned int dma)
153 {
154 struct net_device *dev;
155 struct w83977af_ir *self;
156 int err;
157
158 /* Lock the port that we need */
159 if (!request_region(iobase, CHIP_IO_EXTENT, driver_name)) {
160 pr_debug("%s: can't get iobase of 0x%03x\n",
161 __func__, iobase);
162 return -ENODEV;
163 }
164
165 if (w83977af_probe(iobase, irq, dma) == -1) {
166 err = -1;
167 goto err_out;
168 }
169 /*
170 * Allocate new instance of the driver
171 */
172 dev = alloc_irdadev(sizeof(struct w83977af_ir));
173 if (!dev) {
174 pr_err("IrDA: Can't allocate memory for IrDA control block!\n");
175 err = -ENOMEM;
176 goto err_out;
177 }
178
179 self = netdev_priv(dev);
180 spin_lock_init(&self->lock);
181
182 /* Initialize IO */
183 self->io.fir_base = iobase;
184 self->io.irq = irq;
185 self->io.fir_ext = CHIP_IO_EXTENT;
186 self->io.dma = dma;
187 self->io.fifo_size = 32;
188
189 /* Initialize QoS for this device */
190 irda_init_max_qos_capabilies(&self->qos);
191
192 /* The only value we must override it the baudrate */
193
194 /* FIXME: The HP HDLS-1100 does not support 1152000! */
195 self->qos.baud_rate.bits = IR_9600 | IR_19200 | IR_38400 | IR_57600 |
196 IR_115200 | IR_576000 | IR_1152000 | (IR_4000000 << 8);
197
198 /* The HP HDLS-1100 needs 1 ms according to the specs */
199 self->qos.min_turn_time.bits = qos_mtt_bits;
200 irda_qos_bits_to_value(&self->qos);
201
202 /* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
203 self->rx_buff.truesize = 14384;
204 self->tx_buff.truesize = 4000;
205
206 /* Allocate memory if needed */
207 self->rx_buff.head =
208 dma_zalloc_coherent(NULL, self->rx_buff.truesize,
209 &self->rx_buff_dma, GFP_KERNEL);
210 if (!self->rx_buff.head) {
211 err = -ENOMEM;
212 goto err_out1;
213 }
214
215 self->tx_buff.head =
216 dma_zalloc_coherent(NULL, self->tx_buff.truesize,
217 &self->tx_buff_dma, GFP_KERNEL);
218 if (!self->tx_buff.head) {
219 err = -ENOMEM;
220 goto err_out2;
221 }
222
223 self->rx_buff.in_frame = FALSE;
224 self->rx_buff.state = OUTSIDE_FRAME;
225 self->tx_buff.data = self->tx_buff.head;
226 self->rx_buff.data = self->rx_buff.head;
227 self->netdev = dev;
228
229 dev->netdev_ops = &w83977_netdev_ops;
230
231 err = register_netdev(dev);
232 if (err) {
233 net_err_ratelimited("%s:, register_netdevice() failed!\n",
234 __func__);
235 goto err_out3;
236 }
237 net_info_ratelimited("IrDA: Registered device %s\n", dev->name);
238
239 /* Need to store self somewhere */
240 dev_self[i] = self;
241
242 return 0;
243 err_out3:
244 dma_free_coherent(NULL, self->tx_buff.truesize,
245 self->tx_buff.head, self->tx_buff_dma);
246 err_out2:
247 dma_free_coherent(NULL, self->rx_buff.truesize,
248 self->rx_buff.head, self->rx_buff_dma);
249 err_out1:
250 free_netdev(dev);
251 err_out:
252 release_region(iobase, CHIP_IO_EXTENT);
253 return err;
254 }
255
256 /*
257 * Function w83977af_close (self)
258 *
259 * Close driver instance
260 *
261 */
262 static int w83977af_close(struct w83977af_ir *self)
263 {
264 int iobase;
265
266 iobase = self->io.fir_base;
267
268 #ifdef CONFIG_USE_W977_PNP
269 /* enter PnP configuration mode */
270 w977_efm_enter(efio);
271
272 w977_select_device(W977_DEVICE_IR, efio);
273
274 /* Deactivate device */
275 w977_write_reg(0x30, 0x00, efio);
276
277 w977_efm_exit(efio);
278 #endif /* CONFIG_USE_W977_PNP */
279
280 /* Remove netdevice */
281 unregister_netdev(self->netdev);
282
283 /* Release the PORT that this driver is using */
284 pr_debug("%s: Releasing Region %03x\n", __func__, self->io.fir_base);
285 release_region(self->io.fir_base, self->io.fir_ext);
286
287 if (self->tx_buff.head)
288 dma_free_coherent(NULL, self->tx_buff.truesize,
289 self->tx_buff.head, self->tx_buff_dma);
290
291 if (self->rx_buff.head)
292 dma_free_coherent(NULL, self->rx_buff.truesize,
293 self->rx_buff.head, self->rx_buff_dma);
294
295 free_netdev(self->netdev);
296
297 return 0;
298 }
299
300 static int w83977af_probe(int iobase, int irq, int dma)
301 {
302 int version;
303 int i;
304
305 for (i = 0; i < 2; i++) {
306 #ifdef CONFIG_USE_W977_PNP
307 /* Enter PnP configuration mode */
308 w977_efm_enter(efbase[i]);
309
310 w977_select_device(W977_DEVICE_IR, efbase[i]);
311
312 /* Configure PnP port, IRQ, and DMA channel */
313 w977_write_reg(0x60, (iobase >> 8) & 0xff, efbase[i]);
314 w977_write_reg(0x61, (iobase) & 0xff, efbase[i]);
315
316 w977_write_reg(0x70, irq, efbase[i]);
317 #ifdef CONFIG_ARCH_NETWINDER
318 /* Netwinder uses 1 higher than Linux */
319 w977_write_reg(0x74, dma + 1, efbase[i]);
320 #else
321 w977_write_reg(0x74, dma, efbase[i]);
322 #endif /* CONFIG_ARCH_NETWINDER */
323 w977_write_reg(0x75, 0x04, efbase[i]);/* Disable Tx DMA */
324
325 /* Set append hardware CRC, enable IR bank selection */
326 w977_write_reg(0xf0, APEDCRC | ENBNKSEL, efbase[i]);
327
328 /* Activate device */
329 w977_write_reg(0x30, 0x01, efbase[i]);
330
331 w977_efm_exit(efbase[i]);
332 #endif /* CONFIG_USE_W977_PNP */
333 /* Disable Advanced mode */
334 switch_bank(iobase, SET2);
335 outb(iobase + 2, 0x00);
336
337 /* Turn on UART (global) interrupts */
338 switch_bank(iobase, SET0);
339 outb(HCR_EN_IRQ, iobase + HCR);
340
341 /* Switch to advanced mode */
342 switch_bank(iobase, SET2);
343 outb(inb(iobase + ADCR1) | ADCR1_ADV_SL, iobase + ADCR1);
344
345 /* Set default IR-mode */
346 switch_bank(iobase, SET0);
347 outb(HCR_SIR, iobase + HCR);
348
349 /* Read the Advanced IR ID */
350 switch_bank(iobase, SET3);
351 version = inb(iobase + AUID);
352
353 /* Should be 0x1? */
354 if (0x10 == (version & 0xf0)) {
355 efio = efbase[i];
356
357 /* Set FIFO size to 32 */
358 switch_bank(iobase, SET2);
359 outb(ADCR2_RXFS32 | ADCR2_TXFS32, iobase + ADCR2);
360
361 /* Set FIFO threshold to TX17, RX16 */
362 switch_bank(iobase, SET0);
363 outb(UFR_RXTL | UFR_TXTL | UFR_TXF_RST | UFR_RXF_RST |
364 UFR_EN_FIFO, iobase + UFR);
365
366 /* Receiver frame length */
367 switch_bank(iobase, SET4);
368 outb(2048 & 0xff, iobase + 6);
369 outb((2048 >> 8) & 0x1f, iobase + 7);
370
371 /*
372 * Init HP HSDL-1100 transceiver.
373 *
374 * Set IRX_MSL since we have 2 * receive paths IRRX,
375 * and IRRXH. Clear IRSL0D since we want IRSL0 * to
376 * be a input pin used for IRRXH
377 *
378 * IRRX pin 37 connected to receiver
379 * IRTX pin 38 connected to transmitter
380 * FIRRX pin 39 connected to receiver (IRSL0)
381 * CIRRX pin 40 connected to pin 37
382 */
383 switch_bank(iobase, SET7);
384 outb(0x40, iobase + 7);
385
386 net_info_ratelimited("W83977AF (IR) driver loaded. Version: 0x%02x\n",
387 version);
388
389 return 0;
390 } else {
391 /* Try next extented function register address */
392 pr_debug("%s: Wrong chip version\n", __func__);
393 }
394 }
395 return -1;
396 }
397
398 static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed)
399 {
400 int ir_mode = HCR_SIR;
401 int iobase;
402 __u8 set;
403
404 iobase = self->io.fir_base;
405
406 /* Update accounting for new speed */
407 self->io.speed = speed;
408
409 /* Save current bank */
410 set = inb(iobase + SSR);
411
412 /* Disable interrupts */
413 switch_bank(iobase, SET0);
414 outb(0, iobase + ICR);
415
416 /* Select Set 2 */
417 switch_bank(iobase, SET2);
418 outb(0x00, iobase + ABHL);
419
420 switch (speed) {
421 case 9600: outb(0x0c, iobase + ABLL); break;
422 case 19200: outb(0x06, iobase + ABLL); break;
423 case 38400: outb(0x03, iobase + ABLL); break;
424 case 57600: outb(0x02, iobase + ABLL); break;
425 case 115200: outb(0x01, iobase + ABLL); break;
426 case 576000:
427 ir_mode = HCR_MIR_576;
428 pr_debug("%s: handling baud of 576000\n", __func__);
429 break;
430 case 1152000:
431 ir_mode = HCR_MIR_1152;
432 pr_debug("%s: handling baud of 1152000\n", __func__);
433 break;
434 case 4000000:
435 ir_mode = HCR_FIR;
436 pr_debug("%s: handling baud of 4000000\n", __func__);
437 break;
438 default:
439 ir_mode = HCR_FIR;
440 pr_debug("%s: unknown baud rate of %d\n", __func__, speed);
441 break;
442 }
443
444 /* Set speed mode */
445 switch_bank(iobase, SET0);
446 outb(ir_mode, iobase + HCR);
447
448 /* set FIFO size to 32 */
449 switch_bank(iobase, SET2);
450 outb(ADCR2_RXFS32 | ADCR2_TXFS32, iobase + ADCR2);
451
452 /* set FIFO threshold to TX17, RX16 */
453 switch_bank(iobase, SET0);
454 outb(0x00, iobase + UFR); /* Reset */
455 outb(UFR_EN_FIFO, iobase + UFR); /* First we must enable FIFO */
456 outb(0xa7, iobase + UFR);
457
458 netif_wake_queue(self->netdev);
459
460 /* Enable some interrupts so we can receive frames */
461 switch_bank(iobase, SET0);
462 if (speed > PIO_MAX_SPEED) {
463 outb(ICR_EFSFI, iobase + ICR);
464 w83977af_dma_receive(self);
465 } else {
466 outb(ICR_ERBRI, iobase + ICR);
467 }
468
469 /* Restore SSR */
470 outb(set, iobase + SSR);
471 }
472
473 /*
474 * Function w83977af_hard_xmit (skb, dev)
475 *
476 * Sets up a DMA transfer to send the current frame.
477 *
478 */
479 static netdev_tx_t w83977af_hard_xmit(struct sk_buff *skb,
480 struct net_device *dev)
481 {
482 struct w83977af_ir *self;
483 __s32 speed;
484 int iobase;
485 __u8 set;
486 int mtt;
487
488 self = netdev_priv(dev);
489
490 iobase = self->io.fir_base;
491
492 pr_debug("%s: %ld, skb->len=%d\n", __func__, jiffies, (int)skb->len);
493
494 /* Lock transmit buffer */
495 netif_stop_queue(dev);
496
497 /* Check if we need to change the speed */
498 speed = irda_get_next_speed(skb);
499 if ((speed != self->io.speed) && (speed != -1)) {
500 /* Check for empty frame */
501 if (!skb->len) {
502 w83977af_change_speed(self, speed);
503 dev_kfree_skb(skb);
504 return NETDEV_TX_OK;
505 }
506 self->new_speed = speed;
507 }
508
509 /* Save current set */
510 set = inb(iobase + SSR);
511
512 /* Decide if we should use PIO or DMA transfer */
513 if (self->io.speed > PIO_MAX_SPEED) {
514 self->tx_buff.data = self->tx_buff.head;
515 skb_copy_from_linear_data(skb, self->tx_buff.data, skb->len);
516 self->tx_buff.len = skb->len;
517
518 mtt = irda_get_mtt(skb);
519 pr_debug("%s: %ld, mtt=%d\n", __func__, jiffies, mtt);
520 if (mtt > 1000)
521 mdelay(mtt / 1000);
522 else if (mtt)
523 udelay(mtt);
524
525 /* Enable DMA interrupt */
526 switch_bank(iobase, SET0);
527 outb(ICR_EDMAI, iobase + ICR);
528 w83977af_dma_write(self, iobase);
529 } else {
530 self->tx_buff.data = self->tx_buff.head;
531 self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
532 self->tx_buff.truesize);
533
534 /* Add interrupt on tx low level (will fire immediately) */
535 switch_bank(iobase, SET0);
536 outb(ICR_ETXTHI, iobase + ICR);
537 }
538 dev_kfree_skb(skb);
539
540 /* Restore set register */
541 outb(set, iobase + SSR);
542
543 return NETDEV_TX_OK;
544 }
545
546 /*
547 * Function w83977af_dma_write (self, iobase)
548 *
549 * Send frame using DMA
550 *
551 */
552 static void w83977af_dma_write(struct w83977af_ir *self, int iobase)
553 {
554 __u8 set;
555
556 pr_debug("%s: len=%d\n", __func__, self->tx_buff.len);
557
558 /* Save current set */
559 set = inb(iobase + SSR);
560
561 /* Disable DMA */
562 switch_bank(iobase, SET0);
563 outb(inb(iobase + HCR) & ~HCR_EN_DMA, iobase + HCR);
564
565 /* Choose transmit DMA channel */
566 switch_bank(iobase, SET2);
567 outb(ADCR1_D_CHSW | /*ADCR1_DMA_F|*/ADCR1_ADV_SL, iobase + ADCR1);
568 irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
569 DMA_MODE_WRITE);
570 self->io.direction = IO_XMIT;
571
572 /* Enable DMA */
573 switch_bank(iobase, SET0);
574 outb(inb(iobase + HCR) | HCR_EN_DMA | HCR_TX_WT, iobase + HCR);
575
576 /* Restore set register */
577 outb(set, iobase + SSR);
578 }
579
580 /*
581 * Function w83977af_pio_write (iobase, buf, len, fifo_size)
582 *
583 *
584 *
585 */
586 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
587 {
588 int actual = 0;
589 __u8 set;
590
591 /* Save current bank */
592 set = inb(iobase + SSR);
593
594 switch_bank(iobase, SET0);
595 if (!(inb_p(iobase + USR) & USR_TSRE)) {
596 pr_debug("%s: warning, FIFO not empty yet!\n", __func__);
597
598 fifo_size -= 17;
599 pr_debug("%s: %d bytes left in tx fifo\n", __func__, fifo_size);
600 }
601
602 /* Fill FIFO with current frame */
603 while ((fifo_size-- > 0) && (actual < len)) {
604 /* Transmit next byte */
605 outb(buf[actual++], iobase + TBR);
606 }
607
608 pr_debug("%s: fifo_size %d ; %d sent of %d\n",
609 __func__, fifo_size, actual, len);
610
611 /* Restore bank */
612 outb(set, iobase + SSR);
613
614 return actual;
615 }
616
617 /*
618 * Function w83977af_dma_xmit_complete (self)
619 *
620 * The transfer of a frame in finished. So do the necessary things
621 *
622 *
623 */
624 static void w83977af_dma_xmit_complete(struct w83977af_ir *self)
625 {
626 int iobase;
627 __u8 set;
628
629 pr_debug("%s: %ld\n", __func__, jiffies);
630
631 IRDA_ASSERT(self, return;);
632
633 iobase = self->io.fir_base;
634
635 /* Save current set */
636 set = inb(iobase + SSR);
637
638 /* Disable DMA */
639 switch_bank(iobase, SET0);
640 outb(inb(iobase + HCR) & ~HCR_EN_DMA, iobase + HCR);
641
642 /* Check for underrun! */
643 if (inb(iobase + AUDR) & AUDR_UNDR) {
644 pr_debug("%s: Transmit underrun!\n", __func__);
645
646 self->netdev->stats.tx_errors++;
647 self->netdev->stats.tx_fifo_errors++;
648
649 /* Clear bit, by writing 1 to it */
650 outb(AUDR_UNDR, iobase + AUDR);
651 } else {
652 self->netdev->stats.tx_packets++;
653 }
654
655 if (self->new_speed) {
656 w83977af_change_speed(self, self->new_speed);
657 self->new_speed = 0;
658 }
659
660 /* Unlock tx_buff and request another frame */
661 /* Tell the network layer, that we want more frames */
662 netif_wake_queue(self->netdev);
663
664 /* Restore set */
665 outb(set, iobase + SSR);
666 }
667
668 /*
669 * Function w83977af_dma_receive (self)
670 *
671 * Get ready for receiving a frame. The device will initiate a DMA
672 * if it starts to receive a frame.
673 *
674 */
675 static int w83977af_dma_receive(struct w83977af_ir *self)
676 {
677 int iobase;
678 __u8 set;
679 #ifdef CONFIG_ARCH_NETWINDER
680 unsigned long flags;
681 __u8 hcr;
682 #endif
683 IRDA_ASSERT(self, return -1;);
684
685 pr_debug("%s\n", __func__);
686
687 iobase = self->io.fir_base;
688
689 /* Save current set */
690 set = inb(iobase + SSR);
691
692 /* Disable DMA */
693 switch_bank(iobase, SET0);
694 outb(inb(iobase + HCR) & ~HCR_EN_DMA, iobase + HCR);
695
696 /* Choose DMA Rx, DMA Fairness, and Advanced mode */
697 switch_bank(iobase, SET2);
698 outb((inb(iobase + ADCR1) & ~ADCR1_D_CHSW)/*|ADCR1_DMA_F*/ | ADCR1_ADV_SL,
699 iobase + ADCR1);
700
701 self->io.direction = IO_RECV;
702 self->rx_buff.data = self->rx_buff.head;
703
704 #ifdef CONFIG_ARCH_NETWINDER
705 spin_lock_irqsave(&self->lock, flags);
706
707 disable_dma(self->io.dma);
708 clear_dma_ff(self->io.dma);
709 set_dma_mode(self->io.dma, DMA_MODE_READ);
710 set_dma_addr(self->io.dma, self->rx_buff_dma);
711 set_dma_count(self->io.dma, self->rx_buff.truesize);
712 #else
713 irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
714 DMA_MODE_READ);
715 #endif
716 /*
717 * Reset Rx FIFO. This will also flush the ST_FIFO, it's very
718 * important that we don't reset the Tx FIFO since it might not
719 * be finished transmitting yet
720 */
721 switch_bank(iobase, SET0);
722 outb(UFR_RXTL | UFR_TXTL | UFR_RXF_RST | UFR_EN_FIFO, iobase + UFR);
723 self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
724
725 /* Enable DMA */
726 switch_bank(iobase, SET0);
727 #ifdef CONFIG_ARCH_NETWINDER
728 hcr = inb(iobase + HCR);
729 outb(hcr | HCR_EN_DMA, iobase + HCR);
730 enable_dma(self->io.dma);
731 spin_unlock_irqrestore(&self->lock, flags);
732 #else
733 outb(inb(iobase + HCR) | HCR_EN_DMA, iobase + HCR);
734 #endif
735 /* Restore set */
736 outb(set, iobase + SSR);
737
738 return 0;
739 }
740
741 /*
742 * Function w83977af_receive_complete (self)
743 *
744 * Finished with receiving a frame
745 *
746 */
747 static int w83977af_dma_receive_complete(struct w83977af_ir *self)
748 {
749 struct sk_buff *skb;
750 struct st_fifo *st_fifo;
751 int len;
752 int iobase;
753 __u8 set;
754 __u8 status;
755
756 pr_debug("%s\n", __func__);
757
758 st_fifo = &self->st_fifo;
759
760 iobase = self->io.fir_base;
761
762 /* Save current set */
763 set = inb(iobase + SSR);
764
765 iobase = self->io.fir_base;
766
767 /* Read status FIFO */
768 switch_bank(iobase, SET5);
769 while ((status = inb(iobase + FS_FO)) & FS_FO_FSFDR) {
770 st_fifo->entries[st_fifo->tail].status = status;
771
772 st_fifo->entries[st_fifo->tail].len = inb(iobase + RFLFL);
773 st_fifo->entries[st_fifo->tail].len |= inb(iobase + RFLFH) << 8;
774
775 st_fifo->tail++;
776 st_fifo->len++;
777 }
778
779 while (st_fifo->len) {
780 /* Get first entry */
781 status = st_fifo->entries[st_fifo->head].status;
782 len = st_fifo->entries[st_fifo->head].len;
783 st_fifo->head++;
784 st_fifo->len--;
785
786 /* Check for errors */
787 if (status & FS_FO_ERR_MSK) {
788 if (status & FS_FO_LST_FR) {
789 /* Add number of lost frames to stats */
790 self->netdev->stats.rx_errors += len;
791 } else {
792 /* Skip frame */
793 self->netdev->stats.rx_errors++;
794
795 self->rx_buff.data += len;
796
797 if (status & FS_FO_MX_LEX)
798 self->netdev->stats.rx_length_errors++;
799
800 if (status & FS_FO_PHY_ERR)
801 self->netdev->stats.rx_frame_errors++;
802
803 if (status & FS_FO_CRC_ERR)
804 self->netdev->stats.rx_crc_errors++;
805 }
806 /* The errors below can be reported in both cases */
807 if (status & FS_FO_RX_OV)
808 self->netdev->stats.rx_fifo_errors++;
809
810 if (status & FS_FO_FSF_OV)
811 self->netdev->stats.rx_fifo_errors++;
812
813 } else {
814 /* Check if we have transferred all data to memory */
815 switch_bank(iobase, SET0);
816 if (inb(iobase + USR) & USR_RDR)
817 udelay(80); /* Should be enough!? */
818
819 skb = dev_alloc_skb(len + 1);
820 if (!skb) {
821 pr_info("%s: memory squeeze, dropping frame\n",
822 __func__);
823 /* Restore set register */
824 outb(set, iobase + SSR);
825
826 return FALSE;
827 }
828
829 /* Align to 20 bytes */
830 skb_reserve(skb, 1);
831
832 /* Copy frame without CRC */
833 if (self->io.speed < 4000000) {
834 skb_put(skb, len - 2);
835 skb_copy_to_linear_data(skb,
836 self->rx_buff.data,
837 len - 2);
838 } else {
839 skb_put(skb, len - 4);
840 skb_copy_to_linear_data(skb,
841 self->rx_buff.data,
842 len - 4);
843 }
844
845 /* Move to next frame */
846 self->rx_buff.data += len;
847 self->netdev->stats.rx_packets++;
848
849 skb->dev = self->netdev;
850 skb_reset_mac_header(skb);
851 skb->protocol = htons(ETH_P_IRDA);
852 netif_rx(skb);
853 }
854 }
855 /* Restore set register */
856 outb(set, iobase + SSR);
857
858 return TRUE;
859 }
860
861 /*
862 * Function pc87108_pio_receive (self)
863 *
864 * Receive all data in receiver FIFO
865 *
866 */
867 static void w83977af_pio_receive(struct w83977af_ir *self)
868 {
869 __u8 byte = 0x00;
870 int iobase;
871
872 IRDA_ASSERT(self, return;);
873
874 iobase = self->io.fir_base;
875
876 /* Receive all characters in Rx FIFO */
877 do {
878 byte = inb(iobase + RBR);
879 async_unwrap_char(self->netdev, &self->netdev->stats, &self->rx_buff,
880 byte);
881 } while (inb(iobase + USR) & USR_RDR); /* Data available */
882 }
883
884 /*
885 * Function w83977af_sir_interrupt (self, eir)
886 *
887 * Handle SIR interrupt
888 *
889 */
890 static __u8 w83977af_sir_interrupt(struct w83977af_ir *self, int isr)
891 {
892 int actual;
893 __u8 new_icr = 0;
894 __u8 set;
895 int iobase;
896
897 pr_debug("%s: isr=%#x\n", __func__, isr);
898
899 iobase = self->io.fir_base;
900 /* Transmit FIFO low on data */
901 if (isr & ISR_TXTH_I) {
902 /* Write data left in transmit buffer */
903 actual = w83977af_pio_write(self->io.fir_base,
904 self->tx_buff.data,
905 self->tx_buff.len,
906 self->io.fifo_size);
907
908 self->tx_buff.data += actual;
909 self->tx_buff.len -= actual;
910
911 self->io.direction = IO_XMIT;
912
913 /* Check if finished */
914 if (self->tx_buff.len > 0) {
915 new_icr |= ICR_ETXTHI;
916 } else {
917 set = inb(iobase + SSR);
918 switch_bank(iobase, SET0);
919 outb(AUDR_SFEND, iobase + AUDR);
920 outb(set, iobase + SSR);
921
922 self->netdev->stats.tx_packets++;
923
924 /* Feed me more packets */
925 netif_wake_queue(self->netdev);
926 new_icr |= ICR_ETBREI;
927 }
928 }
929 /* Check if transmission has completed */
930 if (isr & ISR_TXEMP_I) {
931 /* Check if we need to change the speed? */
932 if (self->new_speed) {
933 pr_debug("%s: Changing speed!\n", __func__);
934 w83977af_change_speed(self, self->new_speed);
935 self->new_speed = 0;
936 }
937
938 /* Turn around and get ready to receive some data */
939 self->io.direction = IO_RECV;
940 new_icr |= ICR_ERBRI;
941 }
942
943 /* Rx FIFO threshold or timeout */
944 if (isr & ISR_RXTH_I) {
945 w83977af_pio_receive(self);
946
947 /* Keep receiving */
948 new_icr |= ICR_ERBRI;
949 }
950 return new_icr;
951 }
952
953 /*
954 * Function pc87108_fir_interrupt (self, eir)
955 *
956 * Handle MIR/FIR interrupt
957 *
958 */
959 static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
960 {
961 __u8 new_icr = 0;
962 __u8 set;
963 int iobase;
964
965 iobase = self->io.fir_base;
966 set = inb(iobase + SSR);
967
968 /* End of frame detected in FIFO */
969 if (isr & (ISR_FEND_I | ISR_FSF_I)) {
970 if (w83977af_dma_receive_complete(self)) {
971 /* Wait for next status FIFO interrupt */
972 new_icr |= ICR_EFSFI;
973 } else {
974 /* DMA not finished yet */
975
976 /* Set timer value, resolution 1 ms */
977 switch_bank(iobase, SET4);
978 outb(0x01, iobase + TMRL); /* 1 ms */
979 outb(0x00, iobase + TMRH);
980
981 /* Start timer */
982 outb(IR_MSL_EN_TMR, iobase + IR_MSL);
983
984 new_icr |= ICR_ETMRI;
985 }
986 }
987 /* Timer finished */
988 if (isr & ISR_TMR_I) {
989 /* Disable timer */
990 switch_bank(iobase, SET4);
991 outb(0, iobase + IR_MSL);
992
993 /* Clear timer event */
994 /* switch_bank(iobase, SET0); */
995 /* outb(ASCR_CTE, iobase+ASCR); */
996
997 /* Check if this is a TX timer interrupt */
998 if (self->io.direction == IO_XMIT) {
999 w83977af_dma_write(self, iobase);
1000
1001 new_icr |= ICR_EDMAI;
1002 } else {
1003 /* Check if DMA has now finished */
1004 w83977af_dma_receive_complete(self);
1005
1006 new_icr |= ICR_EFSFI;
1007 }
1008 }
1009 /* Finished with DMA */
1010 if (isr & ISR_DMA_I) {
1011 w83977af_dma_xmit_complete(self);
1012
1013 /* Check if there are more frames to be transmitted */
1014 /* if (irda_device_txqueue_empty(self)) { */
1015
1016 /* Prepare for receive
1017 *
1018 * ** Netwinder Tx DMA likes that we do this anyway **
1019 */
1020 w83977af_dma_receive(self);
1021 new_icr = ICR_EFSFI;
1022 /* } */
1023 }
1024
1025 /* Restore set */
1026 outb(set, iobase + SSR);
1027
1028 return new_icr;
1029 }
1030
1031 /*
1032 * Function w83977af_interrupt (irq, dev_id, regs)
1033 *
1034 * An interrupt from the chip has arrived. Time to do some work
1035 *
1036 */
1037 static irqreturn_t w83977af_interrupt(int irq, void *dev_id)
1038 {
1039 struct net_device *dev = dev_id;
1040 struct w83977af_ir *self;
1041 __u8 set, icr, isr;
1042 int iobase;
1043
1044 self = netdev_priv(dev);
1045
1046 iobase = self->io.fir_base;
1047
1048 /* Save current bank */
1049 set = inb(iobase + SSR);
1050 switch_bank(iobase, SET0);
1051
1052 icr = inb(iobase + ICR);
1053 isr = inb(iobase + ISR) & icr; /* Mask out the interesting ones */
1054
1055 outb(0, iobase + ICR); /* Disable interrupts */
1056
1057 if (isr) {
1058 /* Dispatch interrupt handler for the current speed */
1059 if (self->io.speed > PIO_MAX_SPEED)
1060 icr = w83977af_fir_interrupt(self, isr);
1061 else
1062 icr = w83977af_sir_interrupt(self, isr);
1063 }
1064
1065 outb(icr, iobase + ICR); /* Restore (new) interrupts */
1066 outb(set, iobase + SSR); /* Restore bank register */
1067 return IRQ_RETVAL(isr);
1068 }
1069
1070 /*
1071 * Function w83977af_is_receiving (self)
1072 *
1073 * Return TRUE is we are currently receiving a frame
1074 *
1075 */
1076 static int w83977af_is_receiving(struct w83977af_ir *self)
1077 {
1078 int status = FALSE;
1079 int iobase;
1080 __u8 set;
1081
1082 IRDA_ASSERT(self, return FALSE;);
1083
1084 if (self->io.speed > 115200) {
1085 iobase = self->io.fir_base;
1086
1087 /* Check if rx FIFO is not empty */
1088 set = inb(iobase + SSR);
1089 switch_bank(iobase, SET2);
1090 if ((inb(iobase + RXFDTH) & 0x3f) != 0) {
1091 /* We are receiving something */
1092 status = TRUE;
1093 }
1094 outb(set, iobase + SSR);
1095 } else {
1096 status = (self->rx_buff.state != OUTSIDE_FRAME);
1097 }
1098
1099 return status;
1100 }
1101
1102 /*
1103 * Function w83977af_net_open (dev)
1104 *
1105 * Start the device
1106 *
1107 */
1108 static int w83977af_net_open(struct net_device *dev)
1109 {
1110 struct w83977af_ir *self;
1111 int iobase;
1112 char hwname[32];
1113 __u8 set;
1114
1115 IRDA_ASSERT(dev, return -1;);
1116 self = netdev_priv(dev);
1117
1118 IRDA_ASSERT(self, return 0;);
1119
1120 iobase = self->io.fir_base;
1121
1122 if (request_irq(self->io.irq, w83977af_interrupt, 0, dev->name,
1123 (void *)dev)) {
1124 return -EAGAIN;
1125 }
1126 /*
1127 * Always allocate the DMA channel after the IRQ,
1128 * and clean up on failure.
1129 */
1130 if (request_dma(self->io.dma, dev->name)) {
1131 free_irq(self->io.irq, dev);
1132 return -EAGAIN;
1133 }
1134
1135 /* Save current set */
1136 set = inb(iobase + SSR);
1137
1138 /* Enable some interrupts so we can receive frames again */
1139 switch_bank(iobase, SET0);
1140 if (self->io.speed > 115200) {
1141 outb(ICR_EFSFI, iobase + ICR);
1142 w83977af_dma_receive(self);
1143 } else {
1144 outb(ICR_ERBRI, iobase + ICR);
1145 }
1146
1147 /* Restore bank register */
1148 outb(set, iobase + SSR);
1149
1150 /* Ready to play! */
1151 netif_start_queue(dev);
1152
1153 /* Give self a hardware name */
1154 sprintf(hwname, "w83977af @ 0x%03x", self->io.fir_base);
1155
1156 /*
1157 * Open new IrLAP layer instance, now that everything should be
1158 * initialized properly
1159 */
1160 self->irlap = irlap_open(dev, &self->qos, hwname);
1161
1162 return 0;
1163 }
1164
1165 /*
1166 * Function w83977af_net_close (dev)
1167 *
1168 * Stop the device
1169 *
1170 */
1171 static int w83977af_net_close(struct net_device *dev)
1172 {
1173 struct w83977af_ir *self;
1174 int iobase;
1175 __u8 set;
1176
1177 IRDA_ASSERT(dev, return -1;);
1178
1179 self = netdev_priv(dev);
1180
1181 IRDA_ASSERT(self, return 0;);
1182
1183 iobase = self->io.fir_base;
1184
1185 /* Stop device */
1186 netif_stop_queue(dev);
1187
1188 /* Stop and remove instance of IrLAP */
1189 if (self->irlap)
1190 irlap_close(self->irlap);
1191 self->irlap = NULL;
1192
1193 disable_dma(self->io.dma);
1194
1195 /* Save current set */
1196 set = inb(iobase + SSR);
1197
1198 /* Disable interrupts */
1199 switch_bank(iobase, SET0);
1200 outb(0, iobase + ICR);
1201
1202 free_irq(self->io.irq, dev);
1203 free_dma(self->io.dma);
1204
1205 /* Restore bank register */
1206 outb(set, iobase + SSR);
1207
1208 return 0;
1209 }
1210
1211 /*
1212 * Function w83977af_net_ioctl (dev, rq, cmd)
1213 *
1214 * Process IOCTL commands for this device
1215 *
1216 */
1217 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1218 {
1219 struct if_irda_req *irq = (struct if_irda_req *)rq;
1220 struct w83977af_ir *self;
1221 unsigned long flags;
1222 int ret = 0;
1223
1224 IRDA_ASSERT(dev, return -1;);
1225
1226 self = netdev_priv(dev);
1227
1228 IRDA_ASSERT(self, return -1;);
1229
1230 pr_debug("%s: %s, (cmd=0x%X)\n", __func__, dev->name, cmd);
1231
1232 spin_lock_irqsave(&self->lock, flags);
1233
1234 switch (cmd) {
1235 case SIOCSBANDWIDTH: /* Set bandwidth */
1236 if (!capable(CAP_NET_ADMIN)) {
1237 ret = -EPERM;
1238 goto out;
1239 }
1240 w83977af_change_speed(self, irq->ifr_baudrate);
1241 break;
1242 case SIOCSMEDIABUSY: /* Set media busy */
1243 if (!capable(CAP_NET_ADMIN)) {
1244 ret = -EPERM;
1245 goto out;
1246 }
1247 irda_device_set_media_busy(self->netdev, TRUE);
1248 break;
1249 case SIOCGRECEIVING: /* Check if we are receiving right now */
1250 irq->ifr_receiving = w83977af_is_receiving(self);
1251 break;
1252 default:
1253 ret = -EOPNOTSUPP;
1254 }
1255 out:
1256 spin_unlock_irqrestore(&self->lock, flags);
1257 return ret;
1258 }
1259
1260 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1261 MODULE_DESCRIPTION("Winbond W83977AF IrDA Device Driver");
1262 MODULE_LICENSE("GPL");
1263
1264 module_param(qos_mtt_bits, int, 0);
1265 MODULE_PARM_DESC(qos_mtt_bits, "Mimimum Turn Time");
1266 module_param_array(io, int, NULL, 0);
1267 MODULE_PARM_DESC(io, "Base I/O addresses");
1268 module_param_array(irq, int, NULL, 0);
1269 MODULE_PARM_DESC(irq, "IRQ lines");
1270
1271 /*
1272 * Function init_module (void)
1273 *
1274 *
1275 *
1276 */
1277 module_init(w83977af_init);
1278
1279 /*
1280 * Function cleanup_module (void)
1281 *
1282 *
1283 *
1284 */
1285 module_exit(w83977af_cleanup);
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