1 /*
2 * drivers/pcmcia/m32r_pcc.c
3 *
4 * Device driver for the PCMCIA functionality of M32R.
5 *
6 * Copyright (c) 2001, 2002, 2003, 2004
7 * Hiroyuki Kondo, Naoto Sugai, Hayato Fujiwara
8 */
9
10 #include <linux/module.h>
11 #include <linux/moduleparam.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/fcntl.h>
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/timer.h>
19 #include <linux/ioport.h>
20 #include <linux/delay.h>
21 #include <linux/workqueue.h>
22 #include <linux/interrupt.h>
23 #include <linux/platform_device.h>
24 #include <linux/bitops.h>
25 #include <asm/irq.h>
26 #include <asm/io.h>
27 #include <asm/addrspace.h>
28
29 #include <pcmcia/ss.h>
30
31 /* XXX: should be moved into asm/irq.h */
32 #define PCC0_IRQ 24
33 #define PCC1_IRQ 25
34
35 #include "m32r_pcc.h"
36
37 #define CHAOS_PCC_DEBUG
38 #ifdef CHAOS_PCC_DEBUG
39 static volatile u_short dummy_readbuf;
40 #endif
41
42 #define PCC_DEBUG_DBEX
43
44
45 /* Poll status interval -- 0 means default to interrupt */
46 static int poll_interval = 0;
47
48 typedef enum pcc_space { as_none = 0, as_comm, as_attr, as_io } pcc_as_t;
49
50 typedef struct pcc_socket {
51 u_short type, flags;
52 struct pcmcia_socket socket;
53 unsigned int number;
54 unsigned int ioaddr;
55 u_long mapaddr;
56 u_long base; /* PCC register base */
57 u_char cs_irq, intr;
58 pccard_io_map io_map[MAX_IO_WIN];
59 pccard_mem_map mem_map[MAX_WIN];
60 u_char io_win;
61 u_char mem_win;
62 pcc_as_t current_space;
63 u_char last_iodbex;
64 #ifdef CHAOS_PCC_DEBUG
65 u_char last_iosize;
66 #endif
67 #ifdef CONFIG_PROC_FS
68 struct proc_dir_entry *proc;
69 #endif
70 } pcc_socket_t;
71
72 static int pcc_sockets = 0;
73 static pcc_socket_t socket[M32R_MAX_PCC] = {
74 { 0, }, /* ... */
75 };
76
77 /*====================================================================*/
78
79 static unsigned int pcc_get(u_short, unsigned int);
80 static void pcc_set(u_short, unsigned int , unsigned int );
81
82 static DEFINE_SPINLOCK(pcc_lock);
83
pcc_iorw(int sock,unsigned long port,void * buf,size_t size,size_t nmemb,int wr,int flag)84 void pcc_iorw(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int wr, int flag)
85 {
86 u_long addr;
87 u_long flags;
88 int need_ex;
89 #ifdef PCC_DEBUG_DBEX
90 int _dbex;
91 #endif
92 pcc_socket_t *t = &socket[sock];
93 #ifdef CHAOS_PCC_DEBUG
94 int map_changed = 0;
95 #endif
96
97 /* Need lock ? */
98 spin_lock_irqsave(&pcc_lock, flags);
99
100 /*
101 * Check if need dbex
102 */
103 need_ex = (size > 1 && flag == 0) ? PCMOD_DBEX : 0;
104 #ifdef PCC_DEBUG_DBEX
105 _dbex = need_ex;
106 need_ex = 0;
107 #endif
108
109 /*
110 * calculate access address
111 */
112 addr = t->mapaddr + port - t->ioaddr + KSEG1; /* XXX */
113
114 /*
115 * Check current mapping
116 */
117 if (t->current_space != as_io || t->last_iodbex != need_ex) {
118
119 u_long cbsz;
120
121 /*
122 * Disable first
123 */
124 pcc_set(sock, PCCR, 0);
125
126 /*
127 * Set mode and io address
128 */
129 cbsz = (t->flags & MAP_16BIT) ? 0 : PCMOD_CBSZ;
130 pcc_set(sock, PCMOD, PCMOD_AS_IO | cbsz | need_ex);
131 pcc_set(sock, PCADR, addr & 0x1ff00000);
132
133 /*
134 * Enable and read it
135 */
136 pcc_set(sock, PCCR, 1);
137
138 #ifdef CHAOS_PCC_DEBUG
139 #if 0
140 map_changed = (t->current_space == as_attr && size == 2); /* XXX */
141 #else
142 map_changed = 1;
143 #endif
144 #endif
145 t->current_space = as_io;
146 }
147
148 /*
149 * access to IO space
150 */
151 if (size == 1) {
152 /* Byte */
153 unsigned char *bp = (unsigned char *)buf;
154
155 #ifdef CHAOS_DEBUG
156 if (map_changed) {
157 dummy_readbuf = readb(addr);
158 }
159 #endif
160 if (wr) {
161 /* write Byte */
162 while (nmemb--) {
163 writeb(*bp++, addr);
164 }
165 } else {
166 /* read Byte */
167 while (nmemb--) {
168 *bp++ = readb(addr);
169 }
170 }
171 } else {
172 /* Word */
173 unsigned short *bp = (unsigned short *)buf;
174
175 #ifdef CHAOS_PCC_DEBUG
176 if (map_changed) {
177 dummy_readbuf = readw(addr);
178 }
179 #endif
180 if (wr) {
181 /* write Word */
182 while (nmemb--) {
183 #ifdef PCC_DEBUG_DBEX
184 if (_dbex) {
185 unsigned char *cp = (unsigned char *)bp;
186 unsigned short tmp;
187 tmp = cp[1] << 8 | cp[0];
188 writew(tmp, addr);
189 bp++;
190 } else
191 #endif
192 writew(*bp++, addr);
193 }
194 } else {
195 /* read Word */
196 while (nmemb--) {
197 #ifdef PCC_DEBUG_DBEX
198 if (_dbex) {
199 unsigned char *cp = (unsigned char *)bp;
200 unsigned short tmp;
201 tmp = readw(addr);
202 cp[0] = tmp & 0xff;
203 cp[1] = (tmp >> 8) & 0xff;
204 bp++;
205 } else
206 #endif
207 *bp++ = readw(addr);
208 }
209 }
210 }
211
212 #if 1
213 /* addr is no longer used */
214 if ((addr = pcc_get(sock, PCIRC)) & PCIRC_BWERR) {
215 printk("m32r_pcc: BWERR detected : port 0x%04lx : iosize %dbit\n",
216 port, size * 8);
217 pcc_set(sock, PCIRC, addr);
218 }
219 #endif
220 /*
221 * save state
222 */
223 t->last_iosize = size;
224 t->last_iodbex = need_ex;
225
226 /* Need lock ? */
227
228 spin_unlock_irqrestore(&pcc_lock,flags);
229
230 return;
231 }
232
pcc_ioread(int sock,unsigned long port,void * buf,size_t size,size_t nmemb,int flag)233 void pcc_ioread(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int flag) {
234 pcc_iorw(sock, port, buf, size, nmemb, 0, flag);
235 }
236
pcc_iowrite(int sock,unsigned long port,void * buf,size_t size,size_t nmemb,int flag)237 void pcc_iowrite(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int flag) {
238 pcc_iorw(sock, port, buf, size, nmemb, 1, flag);
239 }
240
241 /*====================================================================*/
242
243 #define IS_REGISTERED 0x2000
244 #define IS_ALIVE 0x8000
245
246 typedef struct pcc_t {
247 char *name;
248 u_short flags;
249 } pcc_t;
250
251 static pcc_t pcc[] = {
252 { "xnux2", 0 }, { "xnux2", 0 },
253 };
254
255 static irqreturn_t pcc_interrupt(int, void *);
256
257 /*====================================================================*/
258
259 static struct timer_list poll_timer;
260
pcc_get(u_short sock,unsigned int reg)261 static unsigned int pcc_get(u_short sock, unsigned int reg)
262 {
263 return inl(socket[sock].base + reg);
264 }
265
266
pcc_set(u_short sock,unsigned int reg,unsigned int data)267 static void pcc_set(u_short sock, unsigned int reg, unsigned int data)
268 {
269 outl(data, socket[sock].base + reg);
270 }
271
272 /*======================================================================
273
274 See if a card is present, powered up, in IO mode, and already
275 bound to a (non PC Card) Linux driver. We leave these alone.
276
277 We make an exception for cards that seem to be serial devices.
278
279 ======================================================================*/
280
is_alive(u_short sock)281 static int __init is_alive(u_short sock)
282 {
283 unsigned int stat;
284 unsigned int f;
285
286 stat = pcc_get(sock, PCIRC);
287 f = (stat & (PCIRC_CDIN1 | PCIRC_CDIN2)) >> 16;
288 if(!f){
289 printk("m32r_pcc: No Card is detected at socket %d : stat = 0x%08x\n",stat,sock);
290 return 0;
291 }
292 if(f!=3)
293 printk("m32r_pcc: Insertion fail (%.8x) at socket %d\n",stat,sock);
294 else
295 printk("m32r_pcc: Card is Inserted at socket %d(%.8x)\n",sock,stat);
296 return 0;
297 }
298
add_pcc_socket(ulong base,int irq,ulong mapaddr,unsigned int ioaddr)299 static void add_pcc_socket(ulong base, int irq, ulong mapaddr,
300 unsigned int ioaddr)
301 {
302 pcc_socket_t *t = &socket[pcc_sockets];
303
304 /* add sockets */
305 t->ioaddr = ioaddr;
306 t->mapaddr = mapaddr;
307 t->base = base;
308 #ifdef CHAOS_PCC_DEBUG
309 t->flags = MAP_16BIT;
310 #else
311 t->flags = 0;
312 #endif
313 if (is_alive(pcc_sockets))
314 t->flags |= IS_ALIVE;
315
316 /* add pcc */
317 if (t->base > 0) {
318 request_region(t->base, 0x20, "m32r-pcc");
319 }
320
321 printk(KERN_INFO " %s ", pcc[pcc_sockets].name);
322 printk("pcc at 0x%08lx\n", t->base);
323
324 /* Update socket interrupt information, capabilities */
325 t->socket.features |= (SS_CAP_PCCARD | SS_CAP_STATIC_MAP);
326 t->socket.map_size = M32R_PCC_MAPSIZE;
327 t->socket.io_offset = ioaddr; /* use for io access offset */
328 t->socket.irq_mask = 0;
329 t->socket.pci_irq = 2 + pcc_sockets; /* XXX */
330
331 request_irq(irq, pcc_interrupt, 0, "m32r-pcc", pcc_interrupt);
332
333 pcc_sockets++;
334
335 return;
336 }
337
338
339 /*====================================================================*/
340
pcc_interrupt(int irq,void * dev)341 static irqreturn_t pcc_interrupt(int irq, void *dev)
342 {
343 int i, j, irc;
344 u_int events, active;
345 int handled = 0;
346
347 pr_debug("m32r_pcc: pcc_interrupt(%d)\n", irq);
348
349 for (j = 0; j < 20; j++) {
350 active = 0;
351 for (i = 0; i < pcc_sockets; i++) {
352 if ((socket[i].cs_irq != irq) &&
353 (socket[i].socket.pci_irq != irq))
354 continue;
355 handled = 1;
356 irc = pcc_get(i, PCIRC);
357 irc >>=16;
358 pr_debug("m32r_pcc: interrupt: socket %d pcirc 0x%02x ",
359 i, irc);
360 if (!irc)
361 continue;
362
363 events = (irc) ? SS_DETECT : 0;
364 events |= (pcc_get(i,PCCR) & PCCR_PCEN) ? SS_READY : 0;
365 pr_debug("m32r_pcc: event 0x%02x\n", events);
366
367 if (events)
368 pcmcia_parse_events(&socket[i].socket, events);
369
370 active |= events;
371 active = 0;
372 }
373 if (!active) break;
374 }
375 if (j == 20)
376 printk(KERN_NOTICE "m32r-pcc: infinite loop in interrupt handler\n");
377
378 pr_debug("m32r_pcc: interrupt done\n");
379
380 return IRQ_RETVAL(handled);
381 } /* pcc_interrupt */
382
pcc_interrupt_wrapper(u_long data)383 static void pcc_interrupt_wrapper(u_long data)
384 {
385 pcc_interrupt(0, NULL);
386 init_timer(&poll_timer);
387 poll_timer.expires = jiffies + poll_interval;
388 add_timer(&poll_timer);
389 }
390
391 /*====================================================================*/
392
_pcc_get_status(u_short sock,u_int * value)393 static int _pcc_get_status(u_short sock, u_int *value)
394 {
395 u_int status;
396
397 status = pcc_get(sock,PCIRC);
398 *value = ((status & PCIRC_CDIN1) && (status & PCIRC_CDIN2))
399 ? SS_DETECT : 0;
400
401 status = pcc_get(sock,PCCR);
402
403 #if 0
404 *value |= (status & PCCR_PCEN) ? SS_READY : 0;
405 #else
406 *value |= SS_READY; /* XXX: always */
407 #endif
408
409 status = pcc_get(sock,PCCSIGCR);
410 *value |= (status & PCCSIGCR_VEN) ? SS_POWERON : 0;
411
412 pr_debug("m32r_pcc: GetStatus(%d) = %#4.4x\n", sock, *value);
413 return 0;
414 } /* _get_status */
415
416 /*====================================================================*/
417
_pcc_set_socket(u_short sock,socket_state_t * state)418 static int _pcc_set_socket(u_short sock, socket_state_t *state)
419 {
420 u_long reg = 0;
421
422 pr_debug("m32r_pcc: SetSocket(%d, flags %#3.3x, Vcc %d, Vpp %d, "
423 "io_irq %d, csc_mask %#2.2x)", sock, state->flags,
424 state->Vcc, state->Vpp, state->io_irq, state->csc_mask);
425
426 if (state->Vcc) {
427 /*
428 * 5V only
429 */
430 if (state->Vcc == 50) {
431 reg |= PCCSIGCR_VEN;
432 } else {
433 return -EINVAL;
434 }
435 }
436
437 if (state->flags & SS_RESET) {
438 pr_debug("m32r_pcc: :RESET\n");
439 reg |= PCCSIGCR_CRST;
440 }
441 if (state->flags & SS_OUTPUT_ENA){
442 pr_debug("m32r_pcc: :OUTPUT_ENA\n");
443 /* bit clear */
444 } else {
445 reg |= PCCSIGCR_SEN;
446 }
447
448 pcc_set(sock,PCCSIGCR,reg);
449
450 if(state->flags & SS_IOCARD){
451 pr_debug("m32r_pcc: :IOCARD");
452 }
453 if (state->flags & SS_PWR_AUTO) {
454 pr_debug("m32r_pcc: :PWR_AUTO");
455 }
456 if (state->csc_mask & SS_DETECT)
457 pr_debug("m32r_pcc: :csc-SS_DETECT");
458 if (state->flags & SS_IOCARD) {
459 if (state->csc_mask & SS_STSCHG)
460 pr_debug("m32r_pcc: :STSCHG");
461 } else {
462 if (state->csc_mask & SS_BATDEAD)
463 pr_debug("m32r_pcc: :BATDEAD");
464 if (state->csc_mask & SS_BATWARN)
465 pr_debug("m32r_pcc: :BATWARN");
466 if (state->csc_mask & SS_READY)
467 pr_debug("m32r_pcc: :READY");
468 }
469 pr_debug("m32r_pcc: \n");
470 return 0;
471 } /* _set_socket */
472
473 /*====================================================================*/
474
_pcc_set_io_map(u_short sock,struct pccard_io_map * io)475 static int _pcc_set_io_map(u_short sock, struct pccard_io_map *io)
476 {
477 u_char map;
478
479 pr_debug("m32r_pcc: SetIOMap(%d, %d, %#2.2x, %d ns, "
480 "%#llx-%#llx)\n", sock, io->map, io->flags,
481 io->speed, (unsigned long long)io->start,
482 (unsigned long long)io->stop);
483 map = io->map;
484
485 return 0;
486 } /* _set_io_map */
487
488 /*====================================================================*/
489
_pcc_set_mem_map(u_short sock,struct pccard_mem_map * mem)490 static int _pcc_set_mem_map(u_short sock, struct pccard_mem_map *mem)
491 {
492
493 u_char map = mem->map;
494 u_long mode;
495 u_long addr;
496 pcc_socket_t *t = &socket[sock];
497 #ifdef CHAOS_PCC_DEBUG
498 #if 0
499 pcc_as_t last = t->current_space;
500 #endif
501 #endif
502
503 pr_debug("m32r_pcc: SetMemMap(%d, %d, %#2.2x, %d ns, "
504 "%#llx, %#x)\n", sock, map, mem->flags,
505 mem->speed, (unsigned long long)mem->static_start,
506 mem->card_start);
507
508 /*
509 * sanity check
510 */
511 if ((map > MAX_WIN) || (mem->card_start > 0x3ffffff)){
512 return -EINVAL;
513 }
514
515 /*
516 * de-activate
517 */
518 if ((mem->flags & MAP_ACTIVE) == 0) {
519 t->current_space = as_none;
520 return 0;
521 }
522
523 /*
524 * Disable first
525 */
526 pcc_set(sock, PCCR, 0);
527
528 /*
529 * Set mode
530 */
531 if (mem->flags & MAP_ATTRIB) {
532 mode = PCMOD_AS_ATTRIB | PCMOD_CBSZ;
533 t->current_space = as_attr;
534 } else {
535 mode = 0; /* common memory */
536 t->current_space = as_comm;
537 }
538 pcc_set(sock, PCMOD, mode);
539
540 /*
541 * Set address
542 */
543 addr = t->mapaddr + (mem->card_start & M32R_PCC_MAPMASK);
544 pcc_set(sock, PCADR, addr);
545
546 mem->static_start = addr + mem->card_start;
547
548 /*
549 * Enable again
550 */
551 pcc_set(sock, PCCR, 1);
552
553 #ifdef CHAOS_PCC_DEBUG
554 #if 0
555 if (last != as_attr) {
556 #else
557 if (1) {
558 #endif
559 dummy_readbuf = *(u_char *)(addr + KSEG1);
560 }
561 #endif
562
563 return 0;
564
565 } /* _set_mem_map */
566
567 #if 0 /* driver model ordering issue */
568 /*======================================================================
569
570 Routines for accessing socket information and register dumps via
571 /proc/bus/pccard/...
572
573 ======================================================================*/
574
575 static ssize_t show_info(struct class_device *class_dev, char *buf)
576 {
577 pcc_socket_t *s = container_of(class_dev, struct pcc_socket,
578 socket.dev);
579
580 return sprintf(buf, "type: %s\nbase addr: 0x%08lx\n",
581 pcc[s->type].name, s->base);
582 }
583
584 static ssize_t show_exca(struct class_device *class_dev, char *buf)
585 {
586 /* FIXME */
587
588 return 0;
589 }
590
591 static CLASS_DEVICE_ATTR(info, S_IRUGO, show_info, NULL);
592 static CLASS_DEVICE_ATTR(exca, S_IRUGO, show_exca, NULL);
593 #endif
594
595 /*====================================================================*/
596
597 /* this is horribly ugly... proper locking needs to be done here at
598 * some time... */
599 #define LOCKED(x) do { \
600 int retval; \
601 unsigned long flags; \
602 spin_lock_irqsave(&pcc_lock, flags); \
603 retval = x; \
604 spin_unlock_irqrestore(&pcc_lock, flags); \
605 return retval; \
606 } while (0)
607
608
609 static int pcc_get_status(struct pcmcia_socket *s, u_int *value)
610 {
611 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
612
613 if (socket[sock].flags & IS_ALIVE) {
614 *value = 0;
615 return -EINVAL;
616 }
617 LOCKED(_pcc_get_status(sock, value));
618 }
619
620 static int pcc_set_socket(struct pcmcia_socket *s, socket_state_t *state)
621 {
622 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
623
624 if (socket[sock].flags & IS_ALIVE)
625 return -EINVAL;
626
627 LOCKED(_pcc_set_socket(sock, state));
628 }
629
630 static int pcc_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
631 {
632 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
633
634 if (socket[sock].flags & IS_ALIVE)
635 return -EINVAL;
636 LOCKED(_pcc_set_io_map(sock, io));
637 }
638
639 static int pcc_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *mem)
640 {
641 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
642
643 if (socket[sock].flags & IS_ALIVE)
644 return -EINVAL;
645 LOCKED(_pcc_set_mem_map(sock, mem));
646 }
647
648 static int pcc_init(struct pcmcia_socket *s)
649 {
650 pr_debug("m32r_pcc: init call\n");
651 return 0;
652 }
653
654 static struct pccard_operations pcc_operations = {
655 .init = pcc_init,
656 .get_status = pcc_get_status,
657 .set_socket = pcc_set_socket,
658 .set_io_map = pcc_set_io_map,
659 .set_mem_map = pcc_set_mem_map,
660 };
661
662 /*====================================================================*/
663
664 static struct platform_driver pcc_driver = {
665 .driver = {
666 .name = "pcc",
667 },
668 };
669
670 static struct platform_device pcc_device = {
671 .name = "pcc",
672 .id = 0,
673 };
674
675 /*====================================================================*/
676
677 static int __init init_m32r_pcc(void)
678 {
679 int i, ret;
680
681 ret = platform_driver_register(&pcc_driver);
682 if (ret)
683 return ret;
684
685 ret = platform_device_register(&pcc_device);
686 if (ret){
687 platform_driver_unregister(&pcc_driver);
688 return ret;
689 }
690
691 printk(KERN_INFO "m32r PCC probe:\n");
692
693 pcc_sockets = 0;
694
695 add_pcc_socket(M32R_PCC0_BASE, PCC0_IRQ, M32R_PCC0_MAPBASE, 0x1000);
696
697 #ifdef CONFIG_M32RPCC_SLOT2
698 add_pcc_socket(M32R_PCC1_BASE, PCC1_IRQ, M32R_PCC1_MAPBASE, 0x2000);
699 #endif
700
701 if (pcc_sockets == 0) {
702 printk("socket is not found.\n");
703 platform_device_unregister(&pcc_device);
704 platform_driver_unregister(&pcc_driver);
705 return -ENODEV;
706 }
707
708 /* Set up interrupt handler(s) */
709
710 for (i = 0 ; i < pcc_sockets ; i++) {
711 socket[i].socket.dev.parent = &pcc_device.dev;
712 socket[i].socket.ops = &pcc_operations;
713 socket[i].socket.resource_ops = &pccard_static_ops;
714 socket[i].socket.owner = THIS_MODULE;
715 socket[i].number = i;
716 ret = pcmcia_register_socket(&socket[i].socket);
717 if (!ret)
718 socket[i].flags |= IS_REGISTERED;
719 }
720
721 /* Finally, schedule a polling interrupt */
722 if (poll_interval != 0) {
723 poll_timer.function = pcc_interrupt_wrapper;
724 poll_timer.data = 0;
725 init_timer(&poll_timer);
726 poll_timer.expires = jiffies + poll_interval;
727 add_timer(&poll_timer);
728 }
729
730 return 0;
731 } /* init_m32r_pcc */
732
733 static void __exit exit_m32r_pcc(void)
734 {
735 int i;
736
737 for (i = 0; i < pcc_sockets; i++)
738 if (socket[i].flags & IS_REGISTERED)
739 pcmcia_unregister_socket(&socket[i].socket);
740
741 platform_device_unregister(&pcc_device);
742 if (poll_interval != 0)
743 del_timer_sync(&poll_timer);
744
745 platform_driver_unregister(&pcc_driver);
746 } /* exit_m32r_pcc */
747
748 module_init(init_m32r_pcc);
749 module_exit(exit_m32r_pcc);
750 MODULE_LICENSE("Dual MPL/GPL");
751 /*====================================================================*/
752