fs_enet: Convert mii-bitbang to use the generic bitbang MDIO code.
[linux-2.6] / 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 #include <linux/module.h>
43 #include <linux/kernel.h>
44 #include <linux/types.h>
45 #include <linux/skbuff.h>
46 #include <linux/netdevice.h>
47 #include <linux/ioport.h>
48 #include <linux/delay.h>
49 #include <linux/slab.h>
50 #include <linux/init.h>
51 #include <linux/rtnetlink.h>
52 #include <linux/dma-mapping.h>
53
54 #include <asm/io.h>
55 #include <asm/dma.h>
56 #include <asm/byteorder.h>
57
58 #include <net/irda/irda.h>
59 #include <net/irda/wrapper.h>
60 #include <net/irda/irda_device.h>
61 #include "w83977af.h"
62 #include "w83977af_ir.h"
63
64 #ifdef  CONFIG_ARCH_NETWINDER            /* Adjust to NetWinder differences */
65 #undef  CONFIG_NETWINDER_TX_DMA_PROBLEMS /* Not needed */
66 #define CONFIG_NETWINDER_RX_DMA_PROBLEMS /* Must have this one! */
67 #endif
68 #undef  CONFIG_USE_INTERNAL_TIMER  /* Just cannot make that timer work */
69 #define CONFIG_USE_W977_PNP        /* Currently needed */
70 #define PIO_MAX_SPEED       115200 
71
72 static char *driver_name = "w83977af_ir";
73 static int  qos_mtt_bits = 0x07;   /* 1 ms or more */
74
75 #define CHIP_IO_EXTENT 8
76
77 static unsigned int io[] = { 0x180, ~0, ~0, ~0 };
78 #ifdef CONFIG_ARCH_NETWINDER             /* Adjust to NetWinder differences */
79 static unsigned int irq[] = { 6, 0, 0, 0 };
80 #else
81 static unsigned int irq[] = { 11, 0, 0, 0 };
82 #endif
83 static unsigned int dma[] = { 1, 0, 0, 0 };
84 static unsigned int efbase[] = { W977_EFIO_BASE, W977_EFIO2_BASE };
85 static unsigned int efio = W977_EFIO_BASE;
86
87 static struct w83977af_ir *dev_self[] = { NULL, NULL, NULL, NULL};
88
89 /* Some prototypes */
90 static int  w83977af_open(int i, unsigned int iobase, unsigned int irq, 
91                           unsigned int dma);
92 static int  w83977af_close(struct w83977af_ir *self);
93 static int  w83977af_probe(int iobase, int irq, int dma);
94 static int  w83977af_dma_receive(struct w83977af_ir *self); 
95 static int  w83977af_dma_receive_complete(struct w83977af_ir *self);
96 static int  w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev);
97 static int  w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
98 static void w83977af_dma_write(struct w83977af_ir *self, int iobase);
99 static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed);
100 static int  w83977af_is_receiving(struct w83977af_ir *self);
101
102 static int  w83977af_net_open(struct net_device *dev);
103 static int  w83977af_net_close(struct net_device *dev);
104 static int  w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
105 static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev);
106
107 /*
108  * Function w83977af_init ()
109  *
110  *    Initialize chip. Just try to find out how many chips we are dealing with
111  *    and where they are
112  */
113 static int __init w83977af_init(void)
114 {
115         int i;
116
117         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
118
119         for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
120                 if (w83977af_open(i, io[i], irq[i], dma[i]) == 0)
121                         return 0;
122         }
123         return -ENODEV;
124 }
125
126 /*
127  * Function w83977af_cleanup ()
128  *
129  *    Close all configured chips
130  *
131  */
132 static void __exit w83977af_cleanup(void)
133 {
134         int i;
135
136         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
137
138         for (i=0; i < ARRAY_SIZE(dev_self); i++) {
139                 if (dev_self[i])
140                         w83977af_close(dev_self[i]);
141         }
142 }
143
144 /*
145  * Function w83977af_open (iobase, irq)
146  *
147  *    Open driver instance
148  *
149  */
150 int w83977af_open(int i, unsigned int iobase, unsigned int irq, 
151                   unsigned int dma)
152 {
153         struct net_device *dev;
154         struct w83977af_ir *self;
155         int err;
156
157         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
158
159         /* Lock the port that we need */
160         if (!request_region(iobase, CHIP_IO_EXTENT, driver_name)) {
161                 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
162                       __FUNCTION__ , iobase);
163                 return -ENODEV;
164         }
165
166         if (w83977af_probe(iobase, irq, dma) == -1) {
167                 err = -1;
168                 goto err_out;
169         }
170         /*
171          *  Allocate new instance of the driver
172          */
173         dev = alloc_irdadev(sizeof(struct w83977af_ir));
174         if (dev == NULL) {
175                 printk( KERN_ERR "IrDA: Can't allocate memory for "
176                         "IrDA control block!\n");
177                 err = -ENOMEM;
178                 goto err_out;
179         }
180
181         self = dev->priv;
182         spin_lock_init(&self->lock);
183    
184
185         /* Initialize IO */
186         self->io.fir_base   = iobase;
187         self->io.irq       = irq;
188         self->io.fir_ext   = CHIP_IO_EXTENT;
189         self->io.dma       = dma;
190         self->io.fifo_size = 32;
191
192         /* Initialize QoS for this device */
193         irda_init_max_qos_capabilies(&self->qos);
194         
195         /* The only value we must override it the baudrate */
196
197         /* FIXME: The HP HDLS-1100 does not support 1152000! */
198         self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
199                 IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);
200
201         /* The HP HDLS-1100 needs 1 ms according to the specs */
202         self->qos.min_turn_time.bits = qos_mtt_bits;
203         irda_qos_bits_to_value(&self->qos);
204         
205         /* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
206         self->rx_buff.truesize = 14384; 
207         self->tx_buff.truesize = 4000;
208         
209         /* Allocate memory if needed */
210         self->rx_buff.head =
211                 dma_alloc_coherent(NULL, self->rx_buff.truesize,
212                                    &self->rx_buff_dma, GFP_KERNEL);
213         if (self->rx_buff.head == NULL) {
214                 err = -ENOMEM;
215                 goto err_out1;
216         }
217
218         memset(self->rx_buff.head, 0, self->rx_buff.truesize);
219         
220         self->tx_buff.head =
221                 dma_alloc_coherent(NULL, self->tx_buff.truesize,
222                                    &self->tx_buff_dma, GFP_KERNEL);
223         if (self->tx_buff.head == NULL) {
224                 err = -ENOMEM;
225                 goto err_out2;
226         }
227         memset(self->tx_buff.head, 0, self->tx_buff.truesize);
228
229         self->rx_buff.in_frame = FALSE;
230         self->rx_buff.state = OUTSIDE_FRAME;
231         self->tx_buff.data = self->tx_buff.head;
232         self->rx_buff.data = self->rx_buff.head;
233         self->netdev = dev;
234
235         /* Override the network functions we need to use */
236         dev->hard_start_xmit = w83977af_hard_xmit;
237         dev->open            = w83977af_net_open;
238         dev->stop            = w83977af_net_close;
239         dev->do_ioctl        = w83977af_net_ioctl;
240         dev->get_stats       = w83977af_net_get_stats;
241
242         err = register_netdev(dev);
243         if (err) {
244                 IRDA_ERROR("%s(), register_netdevice() failed!\n", __FUNCTION__);
245                 goto err_out3;
246         }
247         IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
248
249         /* Need to store self somewhere */
250         dev_self[i] = self;
251         
252         return 0;
253 err_out3:
254         dma_free_coherent(NULL, self->tx_buff.truesize,
255                           self->tx_buff.head, self->tx_buff_dma);
256 err_out2:       
257         dma_free_coherent(NULL, self->rx_buff.truesize,
258                           self->rx_buff.head, self->rx_buff_dma);
259 err_out1:
260         free_netdev(dev);
261 err_out:
262         release_region(iobase, CHIP_IO_EXTENT);
263         return err;
264 }
265
266 /*
267  * Function w83977af_close (self)
268  *
269  *    Close driver instance
270  *
271  */
272 static int w83977af_close(struct w83977af_ir *self)
273 {
274         int iobase;
275
276         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
277
278         iobase = self->io.fir_base;
279
280 #ifdef CONFIG_USE_W977_PNP
281         /* enter PnP configuration mode */
282         w977_efm_enter(efio);
283
284         w977_select_device(W977_DEVICE_IR, efio);
285
286         /* Deactivate device */
287         w977_write_reg(0x30, 0x00, efio);
288
289         w977_efm_exit(efio);
290 #endif /* CONFIG_USE_W977_PNP */
291
292         /* Remove netdevice */
293         unregister_netdev(self->netdev);
294
295         /* Release the PORT that this driver is using */
296         IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n", 
297               __FUNCTION__ , self->io.fir_base);
298         release_region(self->io.fir_base, self->io.fir_ext);
299
300         if (self->tx_buff.head)
301                 dma_free_coherent(NULL, self->tx_buff.truesize,
302                                   self->tx_buff.head, self->tx_buff_dma);
303         
304         if (self->rx_buff.head)
305                 dma_free_coherent(NULL, self->rx_buff.truesize,
306                                   self->rx_buff.head, self->rx_buff_dma);
307
308         free_netdev(self->netdev);
309
310         return 0;
311 }
312
313 int w83977af_probe( int iobase, int irq, int dma)
314 {
315         int version;
316         int i;
317         
318         for (i=0; i < 2; i++) {
319                 IRDA_DEBUG( 0, "%s()\n", __FUNCTION__ );
320 #ifdef CONFIG_USE_W977_PNP
321                 /* Enter PnP configuration mode */
322                 w977_efm_enter(efbase[i]);
323   
324                 w977_select_device(W977_DEVICE_IR, efbase[i]);
325   
326                 /* Configure PnP port, IRQ, and DMA channel */
327                 w977_write_reg(0x60, (iobase >> 8) & 0xff, efbase[i]);
328                 w977_write_reg(0x61, (iobase) & 0xff, efbase[i]);
329   
330                 w977_write_reg(0x70, irq, efbase[i]);
331 #ifdef CONFIG_ARCH_NETWINDER
332                 /* Netwinder uses 1 higher than Linux */
333                 w977_write_reg(0x74, dma+1, efbase[i]);
334 #else
335                 w977_write_reg(0x74, dma, efbase[i]);   
336 #endif /*CONFIG_ARCH_NETWINDER */
337                 w977_write_reg(0x75, 0x04, efbase[i]);  /* Disable Tx DMA */
338         
339                 /* Set append hardware CRC, enable IR bank selection */ 
340                 w977_write_reg(0xf0, APEDCRC|ENBNKSEL, efbase[i]);
341   
342                 /* Activate device */
343                 w977_write_reg(0x30, 0x01, efbase[i]);
344   
345                 w977_efm_exit(efbase[i]);
346 #endif /* CONFIG_USE_W977_PNP */
347                 /* Disable Advanced mode */
348                 switch_bank(iobase, SET2);
349                 outb(iobase+2, 0x00);  
350  
351                 /* Turn on UART (global) interrupts */
352                 switch_bank(iobase, SET0);
353                 outb(HCR_EN_IRQ, iobase+HCR);
354         
355                 /* Switch to advanced mode */
356                 switch_bank(iobase, SET2);
357                 outb(inb(iobase+ADCR1) | ADCR1_ADV_SL, iobase+ADCR1);
358   
359                 /* Set default IR-mode */
360                 switch_bank(iobase, SET0);
361                 outb(HCR_SIR, iobase+HCR);
362   
363                 /* Read the Advanced IR ID */
364                 switch_bank(iobase, SET3);
365                 version = inb(iobase+AUID);
366         
367                 /* Should be 0x1? */
368                 if (0x10 == (version & 0xf0)) {
369                         efio = efbase[i];
370  
371                         /* Set FIFO size to 32 */
372                         switch_bank(iobase, SET2);
373                         outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);  
374         
375                         /* Set FIFO threshold to TX17, RX16 */
376                         switch_bank(iobase, SET0);      
377                         outb(UFR_RXTL|UFR_TXTL|UFR_TXF_RST|UFR_RXF_RST|
378                              UFR_EN_FIFO,iobase+UFR);
379  
380                         /* Receiver frame length */
381                         switch_bank(iobase, SET4);
382                         outb(2048 & 0xff, iobase+6);
383                         outb((2048 >> 8) & 0x1f, iobase+7);
384
385                         /* 
386                          * Init HP HSDL-1100 transceiver. 
387                          * 
388                          * Set IRX_MSL since we have 2 * receive paths IRRX, 
389                          * and IRRXH. Clear IRSL0D since we want IRSL0 * to 
390                          * be a input pin used for IRRXH 
391                          *
392                          *   IRRX  pin 37 connected to receiver 
393                          *   IRTX  pin 38 connected to transmitter
394                          *   FIRRX pin 39 connected to receiver      (IRSL0) 
395                          *   CIRRX pin 40 connected to pin 37
396                          */
397                         switch_bank(iobase, SET7);
398                         outb(0x40, iobase+7);
399                         
400                         IRDA_MESSAGE("W83977AF (IR) driver loaded. "
401                                      "Version: 0x%02x\n", version);
402                         
403                         return 0;
404                 } else {
405                         /* Try next extented function register address */
406                         IRDA_DEBUG( 0, "%s(), Wrong chip version", __FUNCTION__ );
407                 }
408         }       
409         return -1;
410 }
411
412 void w83977af_change_speed(struct w83977af_ir *self, __u32 speed)
413 {
414         int ir_mode = HCR_SIR;
415         int iobase; 
416         __u8 set;
417
418         iobase = self->io.fir_base;
419
420         /* Update accounting for new speed */
421         self->io.speed = speed;
422
423         /* Save current bank */
424         set = inb(iobase+SSR);
425
426         /* Disable interrupts */
427         switch_bank(iobase, SET0);
428         outb(0, iobase+ICR);
429
430         /* Select Set 2 */
431         switch_bank(iobase, SET2);
432         outb(0x00, iobase+ABHL);
433
434         switch (speed) {
435         case 9600:   outb(0x0c, iobase+ABLL); break;
436         case 19200:  outb(0x06, iobase+ABLL); break;
437         case 38400:  outb(0x03, iobase+ABLL); break;
438         case 57600:  outb(0x02, iobase+ABLL); break;
439         case 115200: outb(0x01, iobase+ABLL); break;
440         case 576000:
441                 ir_mode = HCR_MIR_576;
442                 IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __FUNCTION__ );
443                 break;
444         case 1152000:
445                 ir_mode = HCR_MIR_1152;
446                 IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __FUNCTION__ );
447                 break;
448         case 4000000:
449                 ir_mode = HCR_FIR;
450                 IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __FUNCTION__ );
451                 break;
452         default:
453                 ir_mode = HCR_FIR;
454                 IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n", __FUNCTION__ , speed);
455                 break;
456         }
457
458         /* Set speed mode */
459         switch_bank(iobase, SET0);
460         outb(ir_mode, iobase+HCR);
461
462         /* set FIFO size to 32 */
463         switch_bank(iobase, SET2);
464         outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);  
465         
466         /* set FIFO threshold to TX17, RX16 */
467         switch_bank(iobase, SET0);
468         outb(0x00, iobase+UFR);        /* Reset */
469         outb(UFR_EN_FIFO, iobase+UFR); /* First we must enable FIFO */
470         outb(0xa7, iobase+UFR);
471
472         netif_wake_queue(self->netdev);
473                 
474         /* Enable some interrupts so we can receive frames */
475         switch_bank(iobase, SET0);
476         if (speed > PIO_MAX_SPEED) {
477                 outb(ICR_EFSFI, iobase+ICR);
478                 w83977af_dma_receive(self);
479         } else
480                 outb(ICR_ERBRI, iobase+ICR);
481         
482         /* Restore SSR */
483         outb(set, iobase+SSR);
484 }
485
486 /*
487  * Function w83977af_hard_xmit (skb, dev)
488  *
489  *    Sets up a DMA transfer to send the current frame.
490  *
491  */
492 int w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev)
493 {
494         struct w83977af_ir *self;
495         __s32 speed;
496         int iobase;
497         __u8 set;
498         int mtt;
499         
500         self = (struct w83977af_ir *) dev->priv;
501
502         iobase = self->io.fir_base;
503
504         IRDA_DEBUG(4, "%s(%ld), skb->len=%d\n", __FUNCTION__ , jiffies, 
505                    (int) skb->len);
506         
507         /* Lock transmit buffer */
508         netif_stop_queue(dev);
509         
510         /* Check if we need to change the speed */
511         speed = irda_get_next_speed(skb);
512         if ((speed != self->io.speed) && (speed != -1)) {
513                 /* Check for empty frame */
514                 if (!skb->len) {
515                         w83977af_change_speed(self, speed); 
516                         dev->trans_start = jiffies;
517                         dev_kfree_skb(skb);
518                         return 0;
519                 } else
520                         self->new_speed = speed;
521         }
522
523         /* Save current set */
524         set = inb(iobase+SSR);
525         
526         /* Decide if we should use PIO or DMA transfer */
527         if (self->io.speed > PIO_MAX_SPEED) {
528                 self->tx_buff.data = self->tx_buff.head;
529                 skb_copy_from_linear_data(skb, self->tx_buff.data, skb->len);
530                 self->tx_buff.len = skb->len;
531                 
532                 mtt = irda_get_mtt(skb);
533 #ifdef CONFIG_USE_INTERNAL_TIMER
534                 if (mtt > 50) {
535                         /* Adjust for timer resolution */
536                         mtt /= 1000+1;
537
538                         /* Setup timer */
539                         switch_bank(iobase, SET4);
540                         outb(mtt & 0xff, iobase+TMRL);
541                         outb((mtt >> 8) & 0x0f, iobase+TMRH);
542                         
543                         /* Start timer */
544                         outb(IR_MSL_EN_TMR, iobase+IR_MSL);
545                         self->io.direction = IO_XMIT;
546                         
547                         /* Enable timer interrupt */
548                         switch_bank(iobase, SET0);
549                         outb(ICR_ETMRI, iobase+ICR);
550                 } else {
551 #endif
552                         IRDA_DEBUG(4, "%s(%ld), mtt=%d\n", __FUNCTION__ , jiffies, mtt);
553                         if (mtt)
554                                 udelay(mtt);
555
556                         /* Enable DMA interrupt */
557                         switch_bank(iobase, SET0);
558                         outb(ICR_EDMAI, iobase+ICR);
559                         w83977af_dma_write(self, iobase);
560 #ifdef CONFIG_USE_INTERNAL_TIMER
561                 }
562 #endif
563         } else {
564                 self->tx_buff.data = self->tx_buff.head;
565                 self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, 
566                                                    self->tx_buff.truesize);
567                 
568                 /* Add interrupt on tx low level (will fire immediately) */
569                 switch_bank(iobase, SET0);
570                 outb(ICR_ETXTHI, iobase+ICR);
571         }
572         dev->trans_start = jiffies;
573         dev_kfree_skb(skb);
574
575         /* Restore set register */
576         outb(set, iobase+SSR);
577
578         return 0;
579 }
580
581 /*
582  * Function w83977af_dma_write (self, iobase)
583  *
584  *    Send frame using DMA
585  *
586  */
587 static void w83977af_dma_write(struct w83977af_ir *self, int iobase)
588 {
589         __u8 set;
590 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
591         unsigned long flags;
592         __u8 hcr;
593 #endif
594         IRDA_DEBUG(4, "%s(), len=%d\n", __FUNCTION__ , self->tx_buff.len);
595
596         /* Save current set */
597         set = inb(iobase+SSR);
598
599         /* Disable DMA */
600         switch_bank(iobase, SET0);
601         outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
602
603         /* Choose transmit DMA channel  */ 
604         switch_bank(iobase, SET2);
605         outb(ADCR1_D_CHSW|/*ADCR1_DMA_F|*/ADCR1_ADV_SL, iobase+ADCR1);
606 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
607         spin_lock_irqsave(&self->lock, flags);
608
609         disable_dma(self->io.dma);
610         clear_dma_ff(self->io.dma);
611         set_dma_mode(self->io.dma, DMA_MODE_READ);
612         set_dma_addr(self->io.dma, self->tx_buff_dma);
613         set_dma_count(self->io.dma, self->tx_buff.len);
614 #else
615         irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
616                        DMA_MODE_WRITE); 
617 #endif
618         self->io.direction = IO_XMIT;
619         
620         /* Enable DMA */
621         switch_bank(iobase, SET0);
622 #ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
623         hcr = inb(iobase+HCR);
624         outb(hcr | HCR_EN_DMA, iobase+HCR);
625         enable_dma(self->io.dma);
626         spin_unlock_irqrestore(&self->lock, flags);
627 #else   
628         outb(inb(iobase+HCR) | HCR_EN_DMA | HCR_TX_WT, iobase+HCR);
629 #endif
630
631         /* Restore set register */
632         outb(set, iobase+SSR);
633 }
634
635 /*
636  * Function w83977af_pio_write (iobase, buf, len, fifo_size)
637  *
638  *    
639  *
640  */
641 static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
642 {
643         int actual = 0;
644         __u8 set;
645         
646         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
647
648         /* Save current bank */
649         set = inb(iobase+SSR);
650
651         switch_bank(iobase, SET0);
652         if (!(inb_p(iobase+USR) & USR_TSRE)) {
653                 IRDA_DEBUG(4,
654                            "%s(), warning, FIFO not empty yet!\n", __FUNCTION__  );
655
656                 fifo_size -= 17;
657                 IRDA_DEBUG(4, "%s(), %d bytes left in tx fifo\n", 
658                            __FUNCTION__ , fifo_size);
659         }
660
661         /* Fill FIFO with current frame */
662         while ((fifo_size-- > 0) && (actual < len)) {
663                 /* Transmit next byte */
664                 outb(buf[actual++], iobase+TBR);
665         }
666         
667         IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n", 
668                    __FUNCTION__ , fifo_size, actual, len);
669
670         /* Restore bank */
671         outb(set, iobase+SSR);
672
673         return actual;
674 }
675
676 /*
677  * Function w83977af_dma_xmit_complete (self)
678  *
679  *    The transfer of a frame in finished. So do the necessary things
680  *
681  *    
682  */
683 static void w83977af_dma_xmit_complete(struct w83977af_ir *self)
684 {
685         int iobase;
686         __u8 set;
687
688         IRDA_DEBUG(4, "%s(%ld)\n", __FUNCTION__ , jiffies);
689
690         IRDA_ASSERT(self != NULL, return;);
691
692         iobase = self->io.fir_base;
693
694         /* Save current set */
695         set = inb(iobase+SSR);
696
697         /* Disable DMA */
698         switch_bank(iobase, SET0);
699         outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
700         
701         /* Check for underrrun! */
702         if (inb(iobase+AUDR) & AUDR_UNDR) {
703                 IRDA_DEBUG(0, "%s(), Transmit underrun!\n", __FUNCTION__ );
704                 
705                 self->stats.tx_errors++;
706                 self->stats.tx_fifo_errors++;
707
708                 /* Clear bit, by writing 1 to it */
709                 outb(AUDR_UNDR, iobase+AUDR);
710         } else
711                 self->stats.tx_packets++;
712
713         
714         if (self->new_speed) {
715                 w83977af_change_speed(self, self->new_speed);
716                 self->new_speed = 0;
717         }
718
719         /* Unlock tx_buff and request another frame */
720         /* Tell the network layer, that we want more frames */
721         netif_wake_queue(self->netdev);
722         
723         /* Restore set */
724         outb(set, iobase+SSR);
725 }
726
727 /*
728  * Function w83977af_dma_receive (self)
729  *
730  *    Get ready for receiving a frame. The device will initiate a DMA
731  *    if it starts to receive a frame.
732  *
733  */
734 int w83977af_dma_receive(struct w83977af_ir *self) 
735 {
736         int iobase;
737         __u8 set;
738 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
739         unsigned long flags;
740         __u8 hcr;
741 #endif
742         IRDA_ASSERT(self != NULL, return -1;);
743
744         IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
745
746         iobase= self->io.fir_base;
747
748         /* Save current set */
749         set = inb(iobase+SSR);
750
751         /* Disable DMA */
752         switch_bank(iobase, SET0);
753         outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
754
755         /* Choose DMA Rx, DMA Fairness, and Advanced mode */
756         switch_bank(iobase, SET2);
757         outb((inb(iobase+ADCR1) & ~ADCR1_D_CHSW)/*|ADCR1_DMA_F*/|ADCR1_ADV_SL,
758              iobase+ADCR1);
759
760         self->io.direction = IO_RECV;
761         self->rx_buff.data = self->rx_buff.head;
762
763 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
764         spin_lock_irqsave(&self->lock, flags);
765
766         disable_dma(self->io.dma);
767         clear_dma_ff(self->io.dma);
768         set_dma_mode(self->io.dma, DMA_MODE_READ);
769         set_dma_addr(self->io.dma, self->rx_buff_dma);
770         set_dma_count(self->io.dma, self->rx_buff.truesize);
771 #else
772         irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
773                        DMA_MODE_READ);
774 #endif
775         /* 
776          * Reset Rx FIFO. This will also flush the ST_FIFO, it's very 
777          * important that we don't reset the Tx FIFO since it might not
778          * be finished transmitting yet
779          */
780         switch_bank(iobase, SET0);
781         outb(UFR_RXTL|UFR_TXTL|UFR_RXF_RST|UFR_EN_FIFO, iobase+UFR);
782         self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
783         
784         /* Enable DMA */
785         switch_bank(iobase, SET0);
786 #ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
787         hcr = inb(iobase+HCR);
788         outb(hcr | HCR_EN_DMA, iobase+HCR);
789         enable_dma(self->io.dma);
790         spin_unlock_irqrestore(&self->lock, flags);
791 #else   
792         outb(inb(iobase+HCR) | HCR_EN_DMA, iobase+HCR);
793 #endif
794         /* Restore set */
795         outb(set, iobase+SSR);
796
797         return 0;
798 }
799
800 /*
801  * Function w83977af_receive_complete (self)
802  *
803  *    Finished with receiving a frame
804  *
805  */
806 int w83977af_dma_receive_complete(struct w83977af_ir *self)
807 {
808         struct sk_buff *skb;
809         struct st_fifo *st_fifo;
810         int len;
811         int iobase;
812         __u8 set;
813         __u8 status;
814
815         IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
816
817         st_fifo = &self->st_fifo;
818
819         iobase = self->io.fir_base;
820
821         /* Save current set */
822         set = inb(iobase+SSR);
823         
824         iobase = self->io.fir_base;
825
826         /* Read status FIFO */
827         switch_bank(iobase, SET5);
828         while ((status = inb(iobase+FS_FO)) & FS_FO_FSFDR) {
829                 st_fifo->entries[st_fifo->tail].status = status;
830                 
831                 st_fifo->entries[st_fifo->tail].len  = inb(iobase+RFLFL);
832                 st_fifo->entries[st_fifo->tail].len |= inb(iobase+RFLFH) << 8;
833                 
834                 st_fifo->tail++;
835                 st_fifo->len++;
836         }
837         
838         while (st_fifo->len) {
839                 /* Get first entry */
840                 status = st_fifo->entries[st_fifo->head].status;
841                 len    = st_fifo->entries[st_fifo->head].len;
842                 st_fifo->head++;
843                 st_fifo->len--;
844
845                 /* Check for errors */
846                 if (status & FS_FO_ERR_MSK) {
847                         if (status & FS_FO_LST_FR) {
848                                 /* Add number of lost frames to stats */
849                                 self->stats.rx_errors += len;   
850                         } else {
851                                 /* Skip frame */
852                                 self->stats.rx_errors++;
853                                 
854                                 self->rx_buff.data += len;
855                                 
856                                 if (status & FS_FO_MX_LEX)
857                                         self->stats.rx_length_errors++;
858                                 
859                                 if (status & FS_FO_PHY_ERR) 
860                                         self->stats.rx_frame_errors++;
861                                 
862                                 if (status & FS_FO_CRC_ERR) 
863                                         self->stats.rx_crc_errors++;
864                         }
865                         /* The errors below can be reported in both cases */
866                         if (status & FS_FO_RX_OV)
867                                 self->stats.rx_fifo_errors++;
868                         
869                         if (status & FS_FO_FSF_OV)
870                                 self->stats.rx_fifo_errors++;
871                         
872                 } else {
873                         /* Check if we have transferred all data to memory */
874                         switch_bank(iobase, SET0);
875                         if (inb(iobase+USR) & USR_RDR) {
876 #ifdef CONFIG_USE_INTERNAL_TIMER
877                                 /* Put this entry back in fifo */
878                                 st_fifo->head--;
879                                 st_fifo->len++;
880                                 st_fifo->entries[st_fifo->head].status = status;
881                                 st_fifo->entries[st_fifo->head].len = len;
882                                 
883                                 /* Restore set register */
884                                 outb(set, iobase+SSR);
885                         
886                                 return FALSE;   /* I'll be back! */
887 #else
888                                 udelay(80); /* Should be enough!? */
889 #endif
890                         }
891                                                 
892                         skb = dev_alloc_skb(len+1);
893                         if (skb == NULL)  {
894                                 printk(KERN_INFO
895                                        "%s(), memory squeeze, dropping frame.\n", __FUNCTION__);
896                                 /* Restore set register */
897                                 outb(set, iobase+SSR);
898
899                                 return FALSE;
900                         }
901                         
902                         /*  Align to 20 bytes */
903                         skb_reserve(skb, 1); 
904                         
905                         /* Copy frame without CRC */
906                         if (self->io.speed < 4000000) {
907                                 skb_put(skb, len-2);
908                                 skb_copy_to_linear_data(skb,
909                                                         self->rx_buff.data,
910                                                         len - 2);
911                         } else {
912                                 skb_put(skb, len-4);
913                                 skb_copy_to_linear_data(skb,
914                                                         self->rx_buff.data,
915                                                         len - 4);
916                         }
917
918                         /* Move to next frame */
919                         self->rx_buff.data += len;
920                         self->stats.rx_packets++;
921                         
922                         skb->dev = self->netdev;
923                         skb_reset_mac_header(skb);
924                         skb->protocol = htons(ETH_P_IRDA);
925                         netif_rx(skb);
926                         self->netdev->last_rx = jiffies;
927                 }
928         }
929         /* Restore set register */
930         outb(set, iobase+SSR);
931
932         return TRUE;
933 }
934
935 /*
936  * Function pc87108_pio_receive (self)
937  *
938  *    Receive all data in receiver FIFO
939  *
940  */
941 static void w83977af_pio_receive(struct w83977af_ir *self) 
942 {
943         __u8 byte = 0x00;
944         int iobase;
945
946         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
947
948         IRDA_ASSERT(self != NULL, return;);
949         
950         iobase = self->io.fir_base;
951         
952         /*  Receive all characters in Rx FIFO */
953         do {
954                 byte = inb(iobase+RBR);
955                 async_unwrap_char(self->netdev, &self->stats, &self->rx_buff, 
956                                   byte);
957         } while (inb(iobase+USR) & USR_RDR); /* Data available */       
958 }
959
960 /*
961  * Function w83977af_sir_interrupt (self, eir)
962  *
963  *    Handle SIR interrupt
964  *
965  */
966 static __u8 w83977af_sir_interrupt(struct w83977af_ir *self, int isr)
967 {
968         int actual;
969         __u8 new_icr = 0;
970         __u8 set;
971         int iobase;
972
973         IRDA_DEBUG(4, "%s(), isr=%#x\n", __FUNCTION__ , isr);
974         
975         iobase = self->io.fir_base;
976         /* Transmit FIFO low on data */
977         if (isr & ISR_TXTH_I) {
978                 /* Write data left in transmit buffer */
979                 actual = w83977af_pio_write(self->io.fir_base, 
980                                             self->tx_buff.data, 
981                                             self->tx_buff.len, 
982                                             self->io.fifo_size);
983
984                 self->tx_buff.data += actual;
985                 self->tx_buff.len  -= actual;
986                 
987                 self->io.direction = IO_XMIT;
988
989                 /* Check if finished */
990                 if (self->tx_buff.len > 0) {
991                         new_icr |= ICR_ETXTHI;
992                 } else {
993                         set = inb(iobase+SSR);
994                         switch_bank(iobase, SET0);
995                         outb(AUDR_SFEND, iobase+AUDR);
996                         outb(set, iobase+SSR); 
997
998                         self->stats.tx_packets++;
999
1000                         /* Feed me more packets */
1001                         netif_wake_queue(self->netdev);
1002                         new_icr |= ICR_ETBREI;
1003                 }
1004         }
1005         /* Check if transmission has completed */
1006         if (isr & ISR_TXEMP_I) {                
1007                 /* Check if we need to change the speed? */
1008                 if (self->new_speed) {
1009                         IRDA_DEBUG(2,
1010                                    "%s(), Changing speed!\n", __FUNCTION__ );
1011                         w83977af_change_speed(self, self->new_speed);
1012                         self->new_speed = 0;
1013                 }
1014
1015                 /* Turn around and get ready to receive some data */
1016                 self->io.direction = IO_RECV;
1017                 new_icr |= ICR_ERBRI;
1018         }
1019
1020         /* Rx FIFO threshold or timeout */
1021         if (isr & ISR_RXTH_I) {
1022                 w83977af_pio_receive(self);
1023
1024                 /* Keep receiving */
1025                 new_icr |= ICR_ERBRI;
1026         }
1027         return new_icr;
1028 }
1029
1030 /*
1031  * Function pc87108_fir_interrupt (self, eir)
1032  *
1033  *    Handle MIR/FIR interrupt
1034  *
1035  */
1036 static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
1037 {
1038         __u8 new_icr = 0;
1039         __u8 set;
1040         int iobase;
1041
1042         iobase = self->io.fir_base;
1043         set = inb(iobase+SSR);
1044         
1045         /* End of frame detected in FIFO */
1046         if (isr & (ISR_FEND_I|ISR_FSF_I)) {
1047                 if (w83977af_dma_receive_complete(self)) {
1048                         
1049                         /* Wait for next status FIFO interrupt */
1050                         new_icr |= ICR_EFSFI;
1051                 } else {
1052                         /* DMA not finished yet */
1053
1054                         /* Set timer value, resolution 1 ms */
1055                         switch_bank(iobase, SET4);
1056                         outb(0x01, iobase+TMRL); /* 1 ms */
1057                         outb(0x00, iobase+TMRH);
1058
1059                         /* Start timer */
1060                         outb(IR_MSL_EN_TMR, iobase+IR_MSL);
1061
1062                         new_icr |= ICR_ETMRI;
1063                 }
1064         }
1065         /* Timer finished */
1066         if (isr & ISR_TMR_I) {
1067                 /* Disable timer */
1068                 switch_bank(iobase, SET4);
1069                 outb(0, iobase+IR_MSL);
1070
1071                 /* Clear timer event */
1072                 /* switch_bank(iobase, SET0); */
1073 /*              outb(ASCR_CTE, iobase+ASCR); */
1074
1075                 /* Check if this is a TX timer interrupt */
1076                 if (self->io.direction == IO_XMIT) {
1077                         w83977af_dma_write(self, iobase);
1078
1079                         new_icr |= ICR_EDMAI;
1080                 } else {
1081                         /* Check if DMA has now finished */
1082                         w83977af_dma_receive_complete(self);
1083
1084                         new_icr |= ICR_EFSFI;
1085                 }
1086         }       
1087         /* Finished with DMA */
1088         if (isr & ISR_DMA_I) {
1089                 w83977af_dma_xmit_complete(self);
1090
1091                 /* Check if there are more frames to be transmitted */
1092                 /* if (irda_device_txqueue_empty(self)) { */
1093                 
1094                 /* Prepare for receive 
1095                  * 
1096                  * ** Netwinder Tx DMA likes that we do this anyway **
1097                  */
1098                 w83977af_dma_receive(self);
1099                 new_icr = ICR_EFSFI;
1100                /* } */
1101         }
1102         
1103         /* Restore set */
1104         outb(set, iobase+SSR);
1105
1106         return new_icr;
1107 }
1108
1109 /*
1110  * Function w83977af_interrupt (irq, dev_id, regs)
1111  *
1112  *    An interrupt from the chip has arrived. Time to do some work
1113  *
1114  */
1115 static irqreturn_t w83977af_interrupt(int irq, void *dev_id)
1116 {
1117         struct net_device *dev = dev_id;
1118         struct w83977af_ir *self;
1119         __u8 set, icr, isr;
1120         int iobase;
1121
1122         self = dev->priv;
1123
1124         iobase = self->io.fir_base;
1125
1126         /* Save current bank */
1127         set = inb(iobase+SSR);
1128         switch_bank(iobase, SET0);
1129         
1130         icr = inb(iobase+ICR); 
1131         isr = inb(iobase+ISR) & icr; /* Mask out the interesting ones */ 
1132
1133         outb(0, iobase+ICR); /* Disable interrupts */
1134         
1135         if (isr) {
1136                 /* Dispatch interrupt handler for the current speed */
1137                 if (self->io.speed > PIO_MAX_SPEED )
1138                         icr = w83977af_fir_interrupt(self, isr);
1139                 else
1140                         icr = w83977af_sir_interrupt(self, isr);
1141         }
1142
1143         outb(icr, iobase+ICR);    /* Restore (new) interrupts */
1144         outb(set, iobase+SSR);    /* Restore bank register */
1145         return IRQ_RETVAL(isr);
1146 }
1147
1148 /*
1149  * Function w83977af_is_receiving (self)
1150  *
1151  *    Return TRUE is we are currently receiving a frame
1152  *
1153  */
1154 static int w83977af_is_receiving(struct w83977af_ir *self)
1155 {
1156         int status = FALSE;
1157         int iobase;
1158         __u8 set;
1159
1160         IRDA_ASSERT(self != NULL, return FALSE;);
1161
1162         if (self->io.speed > 115200) {
1163                 iobase = self->io.fir_base;
1164
1165                 /* Check if rx FIFO is not empty */
1166                 set = inb(iobase+SSR);
1167                 switch_bank(iobase, SET2);
1168                 if ((inb(iobase+RXFDTH) & 0x3f) != 0) {
1169                         /* We are receiving something */
1170                         status =  TRUE;
1171                 }
1172                 outb(set, iobase+SSR);
1173         } else 
1174                 status = (self->rx_buff.state != OUTSIDE_FRAME);
1175         
1176         return status;
1177 }
1178
1179 /*
1180  * Function w83977af_net_open (dev)
1181  *
1182  *    Start the device
1183  *
1184  */
1185 static int w83977af_net_open(struct net_device *dev)
1186 {
1187         struct w83977af_ir *self;
1188         int iobase;
1189         char hwname[32];
1190         __u8 set;
1191         
1192         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1193         
1194         IRDA_ASSERT(dev != NULL, return -1;);
1195         self = (struct w83977af_ir *) dev->priv;
1196         
1197         IRDA_ASSERT(self != NULL, return 0;);
1198         
1199         iobase = self->io.fir_base;
1200
1201         if (request_irq(self->io.irq, w83977af_interrupt, 0, dev->name, 
1202                         (void *) dev)) {
1203                 return -EAGAIN;
1204         }
1205         /*
1206          * Always allocate the DMA channel after the IRQ,
1207          * and clean up on failure.
1208          */
1209         if (request_dma(self->io.dma, dev->name)) {
1210                 free_irq(self->io.irq, self);
1211                 return -EAGAIN;
1212         }
1213                 
1214         /* Save current set */
1215         set = inb(iobase+SSR);
1216
1217         /* Enable some interrupts so we can receive frames again */
1218         switch_bank(iobase, SET0);
1219         if (self->io.speed > 115200) {
1220                 outb(ICR_EFSFI, iobase+ICR);
1221                 w83977af_dma_receive(self);
1222         } else
1223                 outb(ICR_ERBRI, iobase+ICR);
1224
1225         /* Restore bank register */
1226         outb(set, iobase+SSR);
1227
1228         /* Ready to play! */
1229         netif_start_queue(dev);
1230         
1231         /* Give self a hardware name */
1232         sprintf(hwname, "w83977af @ 0x%03x", self->io.fir_base);
1233
1234         /* 
1235          * Open new IrLAP layer instance, now that everything should be
1236          * initialized properly 
1237          */
1238         self->irlap = irlap_open(dev, &self->qos, hwname);
1239
1240         return 0;
1241 }
1242
1243 /*
1244  * Function w83977af_net_close (dev)
1245  *
1246  *    Stop the device
1247  *
1248  */
1249 static int w83977af_net_close(struct net_device *dev)
1250 {
1251         struct w83977af_ir *self;
1252         int iobase;
1253         __u8 set;
1254
1255         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1256
1257         IRDA_ASSERT(dev != NULL, return -1;);
1258         
1259         self = (struct w83977af_ir *) dev->priv;
1260         
1261         IRDA_ASSERT(self != NULL, return 0;);
1262         
1263         iobase = self->io.fir_base;
1264
1265         /* Stop device */
1266         netif_stop_queue(dev);
1267         
1268         /* Stop and remove instance of IrLAP */
1269         if (self->irlap)
1270                 irlap_close(self->irlap);
1271         self->irlap = NULL;
1272
1273         disable_dma(self->io.dma);
1274
1275         /* Save current set */
1276         set = inb(iobase+SSR);
1277         
1278         /* Disable interrupts */
1279         switch_bank(iobase, SET0);
1280         outb(0, iobase+ICR); 
1281
1282         free_irq(self->io.irq, dev);
1283         free_dma(self->io.dma);
1284
1285         /* Restore bank register */
1286         outb(set, iobase+SSR);
1287
1288         return 0;
1289 }
1290
1291 /*
1292  * Function w83977af_net_ioctl (dev, rq, cmd)
1293  *
1294  *    Process IOCTL commands for this device
1295  *
1296  */
1297 static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1298 {
1299         struct if_irda_req *irq = (struct if_irda_req *) rq;
1300         struct w83977af_ir *self;
1301         unsigned long flags;
1302         int ret = 0;
1303
1304         IRDA_ASSERT(dev != NULL, return -1;);
1305
1306         self = dev->priv;
1307
1308         IRDA_ASSERT(self != NULL, return -1;);
1309
1310         IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__ , dev->name, cmd);
1311         
1312         spin_lock_irqsave(&self->lock, flags);
1313
1314         switch (cmd) {
1315         case SIOCSBANDWIDTH: /* Set bandwidth */
1316                 if (!capable(CAP_NET_ADMIN)) {
1317                         ret = -EPERM;
1318                         goto out;
1319                 }
1320                 w83977af_change_speed(self, irq->ifr_baudrate);
1321                 break;
1322         case SIOCSMEDIABUSY: /* Set media busy */
1323                 if (!capable(CAP_NET_ADMIN)) {
1324                         ret = -EPERM;
1325                         goto out;
1326                 }
1327                 irda_device_set_media_busy(self->netdev, TRUE);
1328                 break;
1329         case SIOCGRECEIVING: /* Check if we are receiving right now */
1330                 irq->ifr_receiving = w83977af_is_receiving(self);
1331                 break;
1332         default:
1333                 ret = -EOPNOTSUPP;
1334         }
1335 out:
1336         spin_unlock_irqrestore(&self->lock, flags);
1337         return ret;
1338 }
1339
1340 static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev)
1341 {
1342         struct w83977af_ir *self = (struct w83977af_ir *) dev->priv;
1343         
1344         return &self->stats;
1345 }
1346
1347 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1348 MODULE_DESCRIPTION("Winbond W83977AF IrDA Device Driver");
1349 MODULE_LICENSE("GPL");
1350
1351
1352 module_param(qos_mtt_bits, int, 0);
1353 MODULE_PARM_DESC(qos_mtt_bits, "Mimimum Turn Time");
1354 module_param_array(io, int, NULL, 0);
1355 MODULE_PARM_DESC(io, "Base I/O addresses");
1356 module_param_array(irq, int, NULL, 0);
1357 MODULE_PARM_DESC(irq, "IRQ lines");
1358
1359 /*
1360  * Function init_module (void)
1361  *
1362  *    
1363  *
1364  */
1365 module_init(w83977af_init);
1366
1367 /*
1368  * Function cleanup_module (void)
1369  *
1370  *    
1371  *
1372  */
1373 module_exit(w83977af_cleanup);