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1/*
2 *
3 * Driver for Bluetooth PCMCIA cards with HCI UART interface
4 *
5 * Copyright (C) 2001-2002 Marcel Holtmann <marcel@holtmann.org>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation;
11 *
12 * Software distributed under the License is distributed on an "AS
13 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
14 * implied. See the License for the specific language governing
15 * rights and limitations under the License.
16 *
17 * The initial developer of the original code is David A. Hinds
18 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
19 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
20 *
21 */
22
23#include <linux/module.h>
24
25#include <linux/kernel.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/types.h>
29#include <linux/delay.h>
30#include <linux/errno.h>
31#include <linux/ptrace.h>
32#include <linux/ioport.h>
33#include <linux/spinlock.h>
34#include <linux/moduleparam.h>
35
36#include <linux/skbuff.h>
37#include <linux/string.h>
38#include <linux/serial.h>
39#include <linux/serial_reg.h>
40#include <linux/bitops.h>
41#include <asm/io.h>
42
43#include <pcmcia/cistpl.h>
44#include <pcmcia/ciscode.h>
45#include <pcmcia/ds.h>
46#include <pcmcia/cisreg.h>
47
48#include <net/bluetooth/bluetooth.h>
49#include <net/bluetooth/hci_core.h>
50
51
52
53/* ======================== Module parameters ======================== */
54
55
56MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
57MODULE_DESCRIPTION("Bluetooth driver for Bluetooth PCMCIA cards with HCI UART interface");
58MODULE_LICENSE("GPL");
59
60
61
62/* ======================== Local structures ======================== */
63
64
65typedef struct btuart_info_t {
66 struct pcmcia_device *p_dev;
67
68 struct hci_dev *hdev;
69
70 spinlock_t lock; /* For serializing operations */
71
72 struct sk_buff_head txq;
73 unsigned long tx_state;
74
75 unsigned long rx_state;
76 unsigned long rx_count;
77 struct sk_buff *rx_skb;
78} btuart_info_t;
79
80
81static int btuart_config(struct pcmcia_device *link);
82static void btuart_release(struct pcmcia_device *link);
83
84static void btuart_detach(struct pcmcia_device *p_dev);
85
86
87/* Maximum baud rate */
88#define SPEED_MAX 115200
89
90/* Default baud rate: 57600, 115200, 230400 or 460800 */
91#define DEFAULT_BAUD_RATE 115200
92
93
94/* Transmit states */
95#define XMIT_SENDING 1
96#define XMIT_WAKEUP 2
97#define XMIT_WAITING 8
98
99/* Receiver states */
100#define RECV_WAIT_PACKET_TYPE 0
101#define RECV_WAIT_EVENT_HEADER 1
102#define RECV_WAIT_ACL_HEADER 2
103#define RECV_WAIT_SCO_HEADER 3
104#define RECV_WAIT_DATA 4
105
106
107
108/* ======================== Interrupt handling ======================== */
109
110
111static int btuart_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
112{
113 int actual = 0;
114
115 /* Tx FIFO should be empty */
116 if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
117 return 0;
118
119 /* Fill FIFO with current frame */
120 while ((fifo_size-- > 0) && (actual < len)) {
121 /* Transmit next byte */
122 outb(buf[actual], iobase + UART_TX);
123 actual++;
124 }
125
126 return actual;
127}
128
129
130static void btuart_write_wakeup(btuart_info_t *info)
131{
132 if (!info) {
133 BT_ERR("Unknown device");
134 return;
135 }
136
137 if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
138 set_bit(XMIT_WAKEUP, &(info->tx_state));
139 return;
140 }
141
142 do {
143 register unsigned int iobase = info->p_dev->resource[0]->start;
144 register struct sk_buff *skb;
145 register int len;
146
147 clear_bit(XMIT_WAKEUP, &(info->tx_state));
148
149 if (!pcmcia_dev_present(info->p_dev))
150 return;
151
152 if (!(skb = skb_dequeue(&(info->txq))))
153 break;
154
155 /* Send frame */
156 len = btuart_write(iobase, 16, skb->data, skb->len);
157 set_bit(XMIT_WAKEUP, &(info->tx_state));
158
159 if (len == skb->len) {
160 kfree_skb(skb);
161 } else {
162 skb_pull(skb, len);
163 skb_queue_head(&(info->txq), skb);
164 }
165
166 info->hdev->stat.byte_tx += len;
167
168 } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
169
170 clear_bit(XMIT_SENDING, &(info->tx_state));
171}
172
173
174static void btuart_receive(btuart_info_t *info)
175{
176 unsigned int iobase;
177 int boguscount = 0;
178
179 if (!info) {
180 BT_ERR("Unknown device");
181 return;
182 }
183
184 iobase = info->p_dev->resource[0]->start;
185
186 do {
187 info->hdev->stat.byte_rx++;
188
189 /* Allocate packet */
190 if (info->rx_skb == NULL) {
191 info->rx_state = RECV_WAIT_PACKET_TYPE;
192 info->rx_count = 0;
193 if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
194 BT_ERR("Can't allocate mem for new packet");
195 return;
196 }
197 }
198
199 if (info->rx_state == RECV_WAIT_PACKET_TYPE) {
200
201 info->rx_skb->dev = (void *) info->hdev;
202 bt_cb(info->rx_skb)->pkt_type = inb(iobase + UART_RX);
203
204 switch (bt_cb(info->rx_skb)->pkt_type) {
205
206 case HCI_EVENT_PKT:
207 info->rx_state = RECV_WAIT_EVENT_HEADER;
208 info->rx_count = HCI_EVENT_HDR_SIZE;
209 break;
210
211 case HCI_ACLDATA_PKT:
212 info->rx_state = RECV_WAIT_ACL_HEADER;
213 info->rx_count = HCI_ACL_HDR_SIZE;
214 break;
215
216 case HCI_SCODATA_PKT:
217 info->rx_state = RECV_WAIT_SCO_HEADER;
218 info->rx_count = HCI_SCO_HDR_SIZE;
219 break;
220
221 default:
222 /* Unknown packet */
223 BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
224 info->hdev->stat.err_rx++;
225 clear_bit(HCI_RUNNING, &(info->hdev->flags));
226
227 kfree_skb(info->rx_skb);
228 info->rx_skb = NULL;
229 break;
230
231 }
232
233 } else {
234
235 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
236 info->rx_count--;
237
238 if (info->rx_count == 0) {
239
240 int dlen;
241 struct hci_event_hdr *eh;
242 struct hci_acl_hdr *ah;
243 struct hci_sco_hdr *sh;
244
245
246 switch (info->rx_state) {
247
248 case RECV_WAIT_EVENT_HEADER:
249 eh = hci_event_hdr(info->rx_skb);
250 info->rx_state = RECV_WAIT_DATA;
251 info->rx_count = eh->plen;
252 break;
253
254 case RECV_WAIT_ACL_HEADER:
255 ah = hci_acl_hdr(info->rx_skb);
256 dlen = __le16_to_cpu(ah->dlen);
257 info->rx_state = RECV_WAIT_DATA;
258 info->rx_count = dlen;
259 break;
260
261 case RECV_WAIT_SCO_HEADER:
262 sh = hci_sco_hdr(info->rx_skb);
263 info->rx_state = RECV_WAIT_DATA;
264 info->rx_count = sh->dlen;
265 break;
266
267 case RECV_WAIT_DATA:
268 hci_recv_frame(info->rx_skb);
269 info->rx_skb = NULL;
270 break;
271
272 }
273
274 }
275
276 }
277
278 /* Make sure we don't stay here too long */
279 if (boguscount++ > 16)
280 break;
281
282 } while (inb(iobase + UART_LSR) & UART_LSR_DR);
283}
284
285
286static irqreturn_t btuart_interrupt(int irq, void *dev_inst)
287{
288 btuart_info_t *info = dev_inst;
289 unsigned int iobase;
290 int boguscount = 0;
291 int iir, lsr;
292 irqreturn_t r = IRQ_NONE;
293
294 if (!info || !info->hdev)
295 /* our irq handler is shared */
296 return IRQ_NONE;
297
298 iobase = info->p_dev->resource[0]->start;
299
300 spin_lock(&(info->lock));
301
302 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
303 while (iir) {
304 r = IRQ_HANDLED;
305
306 /* Clear interrupt */
307 lsr = inb(iobase + UART_LSR);
308
309 switch (iir) {
310 case UART_IIR_RLSI:
311 BT_ERR("RLSI");
312 break;
313 case UART_IIR_RDI:
314 /* Receive interrupt */
315 btuart_receive(info);
316 break;
317 case UART_IIR_THRI:
318 if (lsr & UART_LSR_THRE) {
319 /* Transmitter ready for data */
320 btuart_write_wakeup(info);
321 }
322 break;
323 default:
324 BT_ERR("Unhandled IIR=%#x", iir);
325 break;
326 }
327
328 /* Make sure we don't stay here too long */
329 if (boguscount++ > 100)
330 break;
331
332 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
333
334 }
335
336 spin_unlock(&(info->lock));
337
338 return r;
339}
340
341
342static void btuart_change_speed(btuart_info_t *info, unsigned int speed)
343{
344 unsigned long flags;
345 unsigned int iobase;
346 int fcr; /* FIFO control reg */
347 int lcr; /* Line control reg */
348 int divisor;
349
350 if (!info) {
351 BT_ERR("Unknown device");
352 return;
353 }
354
355 iobase = info->p_dev->resource[0]->start;
356
357 spin_lock_irqsave(&(info->lock), flags);
358
359 /* Turn off interrupts */
360 outb(0, iobase + UART_IER);
361
362 divisor = SPEED_MAX / speed;
363
364 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
365
366 /*
367 * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
368 * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
369 * about this timeout since it will always be fast enough.
370 */
371
372 if (speed < 38400)
373 fcr |= UART_FCR_TRIGGER_1;
374 else
375 fcr |= UART_FCR_TRIGGER_14;
376
377 /* Bluetooth cards use 8N1 */
378 lcr = UART_LCR_WLEN8;
379
380 outb(UART_LCR_DLAB | lcr, iobase + UART_LCR); /* Set DLAB */
381 outb(divisor & 0xff, iobase + UART_DLL); /* Set speed */
382 outb(divisor >> 8, iobase + UART_DLM);
383 outb(lcr, iobase + UART_LCR); /* Set 8N1 */
384 outb(fcr, iobase + UART_FCR); /* Enable FIFO's */
385
386 /* Turn on interrupts */
387 outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
388
389 spin_unlock_irqrestore(&(info->lock), flags);
390}
391
392
393
394/* ======================== HCI interface ======================== */
395
396
397static int btuart_hci_flush(struct hci_dev *hdev)
398{
399 btuart_info_t *info = hci_get_drvdata(hdev);
400
401 /* Drop TX queue */
402 skb_queue_purge(&(info->txq));
403
404 return 0;
405}
406
407
408static int btuart_hci_open(struct hci_dev *hdev)
409{
410 set_bit(HCI_RUNNING, &(hdev->flags));
411
412 return 0;
413}
414
415
416static int btuart_hci_close(struct hci_dev *hdev)
417{
418 if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
419 return 0;
420
421 btuart_hci_flush(hdev);
422
423 return 0;
424}
425
426
427static int btuart_hci_send_frame(struct sk_buff *skb)
428{
429 btuart_info_t *info;
430 struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
431
432 if (!hdev) {
433 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
434 return -ENODEV;
435 }
436
437 info = hci_get_drvdata(hdev);
438
439 switch (bt_cb(skb)->pkt_type) {
440 case HCI_COMMAND_PKT:
441 hdev->stat.cmd_tx++;
442 break;
443 case HCI_ACLDATA_PKT:
444 hdev->stat.acl_tx++;
445 break;
446 case HCI_SCODATA_PKT:
447 hdev->stat.sco_tx++;
448 break;
449 };
450
451 /* Prepend skb with frame type */
452 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
453 skb_queue_tail(&(info->txq), skb);
454
455 btuart_write_wakeup(info);
456
457 return 0;
458}
459
460
461static int btuart_hci_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
462{
463 return -ENOIOCTLCMD;
464}
465
466
467
468/* ======================== Card services HCI interaction ======================== */
469
470
471static int btuart_open(btuart_info_t *info)
472{
473 unsigned long flags;
474 unsigned int iobase = info->p_dev->resource[0]->start;
475 struct hci_dev *hdev;
476
477 spin_lock_init(&(info->lock));
478
479 skb_queue_head_init(&(info->txq));
480
481 info->rx_state = RECV_WAIT_PACKET_TYPE;
482 info->rx_count = 0;
483 info->rx_skb = NULL;
484
485 /* Initialize HCI device */
486 hdev = hci_alloc_dev();
487 if (!hdev) {
488 BT_ERR("Can't allocate HCI device");
489 return -ENOMEM;
490 }
491
492 info->hdev = hdev;
493
494 hdev->bus = HCI_PCCARD;
495 hci_set_drvdata(hdev, info);
496 SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
497
498 hdev->open = btuart_hci_open;
499 hdev->close = btuart_hci_close;
500 hdev->flush = btuart_hci_flush;
501 hdev->send = btuart_hci_send_frame;
502 hdev->ioctl = btuart_hci_ioctl;
503
504 spin_lock_irqsave(&(info->lock), flags);
505
506 /* Reset UART */
507 outb(0, iobase + UART_MCR);
508
509 /* Turn off interrupts */
510 outb(0, iobase + UART_IER);
511
512 /* Initialize UART */
513 outb(UART_LCR_WLEN8, iobase + UART_LCR); /* Reset DLAB */
514 outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
515
516 /* Turn on interrupts */
517 // outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
518
519 spin_unlock_irqrestore(&(info->lock), flags);
520
521 btuart_change_speed(info, DEFAULT_BAUD_RATE);
522
523 /* Timeout before it is safe to send the first HCI packet */
524 msleep(1000);
525
526 /* Register HCI device */
527 if (hci_register_dev(hdev) < 0) {
528 BT_ERR("Can't register HCI device");
529 info->hdev = NULL;
530 hci_free_dev(hdev);
531 return -ENODEV;
532 }
533
534 return 0;
535}
536
537
538static int btuart_close(btuart_info_t *info)
539{
540 unsigned long flags;
541 unsigned int iobase = info->p_dev->resource[0]->start;
542 struct hci_dev *hdev = info->hdev;
543
544 if (!hdev)
545 return -ENODEV;
546
547 btuart_hci_close(hdev);
548
549 spin_lock_irqsave(&(info->lock), flags);
550
551 /* Reset UART */
552 outb(0, iobase + UART_MCR);
553
554 /* Turn off interrupts */
555 outb(0, iobase + UART_IER);
556
557 spin_unlock_irqrestore(&(info->lock), flags);
558
559 hci_unregister_dev(hdev);
560 hci_free_dev(hdev);
561
562 return 0;
563}
564
565static int btuart_probe(struct pcmcia_device *link)
566{
567 btuart_info_t *info;
568
569 /* Create new info device */
570 info = kzalloc(sizeof(*info), GFP_KERNEL);
571 if (!info)
572 return -ENOMEM;
573
574 info->p_dev = link;
575 link->priv = info;
576
577 link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_VPP |
578 CONF_AUTO_SET_IO;
579
580 return btuart_config(link);
581}
582
583
584static void btuart_detach(struct pcmcia_device *link)
585{
586 btuart_info_t *info = link->priv;
587
588 btuart_release(link);
589 kfree(info);
590}
591
592static int btuart_check_config(struct pcmcia_device *p_dev, void *priv_data)
593{
594 int *try = priv_data;
595
596 if (try == 0)
597 p_dev->io_lines = 16;
598
599 if ((p_dev->resource[0]->end != 8) || (p_dev->resource[0]->start == 0))
600 return -EINVAL;
601
602 p_dev->resource[0]->end = 8;
603 p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
604 p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
605
606 return pcmcia_request_io(p_dev);
607}
608
609static int btuart_check_config_notpicky(struct pcmcia_device *p_dev,
610 void *priv_data)
611{
612 static unsigned int base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
613 int j;
614
615 if (p_dev->io_lines > 3)
616 return -ENODEV;
617
618 p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
619 p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
620 p_dev->resource[0]->end = 8;
621
622 for (j = 0; j < 5; j++) {
623 p_dev->resource[0]->start = base[j];
624 p_dev->io_lines = base[j] ? 16 : 3;
625 if (!pcmcia_request_io(p_dev))
626 return 0;
627 }
628 return -ENODEV;
629}
630
631static int btuart_config(struct pcmcia_device *link)
632{
633 btuart_info_t *info = link->priv;
634 int i;
635 int try;
636
637 /* First pass: look for a config entry that looks normal.
638 Two tries: without IO aliases, then with aliases */
639 for (try = 0; try < 2; try++)
640 if (!pcmcia_loop_config(link, btuart_check_config, &try))
641 goto found_port;
642
643 /* Second pass: try to find an entry that isn't picky about
644 its base address, then try to grab any standard serial port
645 address, and finally try to get any free port. */
646 if (!pcmcia_loop_config(link, btuart_check_config_notpicky, NULL))
647 goto found_port;
648
649 BT_ERR("No usable port range found");
650 goto failed;
651
652found_port:
653 i = pcmcia_request_irq(link, btuart_interrupt);
654 if (i != 0)
655 goto failed;
656
657 i = pcmcia_enable_device(link);
658 if (i != 0)
659 goto failed;
660
661 if (btuart_open(info) != 0)
662 goto failed;
663
664 return 0;
665
666failed:
667 btuart_release(link);
668 return -ENODEV;
669}
670
671
672static void btuart_release(struct pcmcia_device *link)
673{
674 btuart_info_t *info = link->priv;
675
676 btuart_close(info);
677
678 pcmcia_disable_device(link);
679}
680
681static const struct pcmcia_device_id btuart_ids[] = {
682 /* don't use this driver. Use serial_cs + hci_uart instead */
683 PCMCIA_DEVICE_NULL
684};
685MODULE_DEVICE_TABLE(pcmcia, btuart_ids);
686
687static struct pcmcia_driver btuart_driver = {
688 .owner = THIS_MODULE,
689 .name = "btuart_cs",
690 .probe = btuart_probe,
691 .remove = btuart_detach,
692 .id_table = btuart_ids,
693};
694
695static int __init init_btuart_cs(void)
696{
697 return pcmcia_register_driver(&btuart_driver);
698}
699
700
701static void __exit exit_btuart_cs(void)
702{
703 pcmcia_unregister_driver(&btuart_driver);
704}
705
706module_init(init_btuart_cs);
707module_exit(exit_btuart_cs);