2 * PCMCIA socket code for the Alchemy Db1xxx/Pb1xxx boards.
4 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
8 /* This is a fairly generic PCMCIA socket driver suitable for the
9 * following Alchemy Development boards:
10 * Db1000, Db/Pb1500, Db/Pb1100, Db/Pb1550, Db/Pb1200.
12 * The Db1000 is used as a reference: Per-socket card-, carddetect- and
13 * statuschange IRQs connected to SoC GPIOs, control and status register
14 * bits arranged in per-socket groups in an external PLD. All boards
15 * listed here use this layout, including bit positions and meanings.
16 * Of course there are exceptions in later boards:
18 * - Pb1100/Pb1500: single socket only; voltage key bits VS are
19 * at STATUS[5:4] (instead of STATUS[1:0]).
20 * - Au1200-based: additional card-eject irqs, irqs not gpios!
23 #include <linux/delay.h>
24 #include <linux/gpio.h>
25 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/resource.h>
29 #include <linux/slab.h>
30 #include <linux/spinlock.h>
32 #include <pcmcia/cs_types.h>
33 #include <pcmcia/ss.h>
35 #include <asm/mach-au1x00/au1000.h>
36 #include <asm/mach-db1x00/bcsr.h>
38 #define MEM_MAP_SIZE 0x400000
39 #define IO_MAP_SIZE 0x1000
41 struct db1x_pcmcia_sock
{
42 struct pcmcia_socket socket
;
43 int nr
; /* socket number */
47 phys_addr_t phys_attr
;
50 /* previous flags for set_socket() */
51 unsigned int old_flags
;
53 /* interrupt sources: linux irq numbers! */
54 int insert_irq
; /* default carddetect irq */
55 int stschg_irq
; /* card-status-change irq */
56 int card_irq
; /* card irq */
57 int eject_irq
; /* db1200/pb1200 have these */
59 #define BOARD_TYPE_DEFAULT 0 /* most boards */
60 #define BOARD_TYPE_DB1200 1 /* IRQs aren't gpios */
61 #define BOARD_TYPE_PB1100 2 /* VS bits slightly different */
65 #define to_db1x_socket(x) container_of(x, struct db1x_pcmcia_sock, socket)
67 /* DB/PB1200: check CPLD SIGSTATUS register bit 10/12 */
68 static int db1200_card_inserted(struct db1x_pcmcia_sock
*sock
)
70 unsigned short sigstat
;
72 sigstat
= bcsr_read(BCSR_SIGSTAT
);
73 return sigstat
& 1 << (8 + 2 * sock
->nr
);
76 /* carddetect gpio: low-active */
77 static int db1000_card_inserted(struct db1x_pcmcia_sock
*sock
)
79 return !gpio_get_value(irq_to_gpio(sock
->insert_irq
));
82 static int db1x_card_inserted(struct db1x_pcmcia_sock
*sock
)
84 switch (sock
->board_type
) {
85 case BOARD_TYPE_DB1200
:
86 return db1200_card_inserted(sock
);
88 return db1000_card_inserted(sock
);
92 /* STSCHG tends to bounce heavily when cards are inserted/ejected.
93 * To avoid this, the interrupt is normally disabled and only enabled
94 * after reset to a card has been de-asserted.
96 static inline void set_stschg(struct db1x_pcmcia_sock
*sock
, int en
)
98 if (sock
->stschg_irq
!= -1) {
100 enable_irq(sock
->stschg_irq
);
102 disable_irq(sock
->stschg_irq
);
106 static irqreturn_t
db1000_pcmcia_cdirq(int irq
, void *data
)
108 struct db1x_pcmcia_sock
*sock
= data
;
110 pcmcia_parse_events(&sock
->socket
, SS_DETECT
);
115 static irqreturn_t
db1000_pcmcia_stschgirq(int irq
, void *data
)
117 struct db1x_pcmcia_sock
*sock
= data
;
119 pcmcia_parse_events(&sock
->socket
, SS_STSCHG
);
124 static irqreturn_t
db1200_pcmcia_cdirq(int irq
, void *data
)
126 struct db1x_pcmcia_sock
*sock
= data
;
128 /* Db/Pb1200 have separate per-socket insertion and ejection
129 * interrupts which stay asserted as long as the card is
130 * inserted/missing. The one which caused us to be called
131 * needs to be disabled and the other one enabled.
133 if (irq
== sock
->insert_irq
) {
134 disable_irq_nosync(sock
->insert_irq
);
135 enable_irq(sock
->eject_irq
);
137 disable_irq_nosync(sock
->eject_irq
);
138 enable_irq(sock
->insert_irq
);
141 pcmcia_parse_events(&sock
->socket
, SS_DETECT
);
146 static int db1x_pcmcia_setup_irqs(struct db1x_pcmcia_sock
*sock
)
151 if (sock
->stschg_irq
!= -1) {
152 ret
= request_irq(sock
->stschg_irq
, db1000_pcmcia_stschgirq
,
153 0, "pcmcia_stschg", sock
);
158 /* Db/Pb1200 have separate per-socket insertion and ejection
159 * interrupts, which should show edge behaviour but don't.
160 * So interrupts are disabled until both insertion and
161 * ejection handler have been registered and the currently
162 * active one disabled.
164 if (sock
->board_type
== BOARD_TYPE_DB1200
) {
165 local_irq_save(flags
);
167 ret
= request_irq(sock
->insert_irq
, db1200_pcmcia_cdirq
,
168 IRQF_DISABLED
, "pcmcia_insert", sock
);
172 ret
= request_irq(sock
->eject_irq
, db1200_pcmcia_cdirq
,
173 IRQF_DISABLED
, "pcmcia_eject", sock
);
175 free_irq(sock
->insert_irq
, sock
);
176 local_irq_restore(flags
);
180 /* disable the currently active one */
181 if (db1200_card_inserted(sock
))
182 disable_irq_nosync(sock
->insert_irq
);
184 disable_irq_nosync(sock
->eject_irq
);
186 local_irq_restore(flags
);
188 /* all other (older) Db1x00 boards use a GPIO to show
189 * card detection status: use both-edge triggers.
191 set_irq_type(sock
->insert_irq
, IRQ_TYPE_EDGE_BOTH
);
192 ret
= request_irq(sock
->insert_irq
, db1000_pcmcia_cdirq
,
193 0, "pcmcia_carddetect", sock
);
199 return 0; /* all done */
202 if (sock
->stschg_irq
!= -1)
203 free_irq(sock
->stschg_irq
, sock
);
208 static void db1x_pcmcia_free_irqs(struct db1x_pcmcia_sock
*sock
)
210 if (sock
->stschg_irq
!= -1)
211 free_irq(sock
->stschg_irq
, sock
);
213 free_irq(sock
->insert_irq
, sock
);
214 if (sock
->eject_irq
!= -1)
215 free_irq(sock
->eject_irq
, sock
);
219 * configure a PCMCIA socket on the Db1x00 series of boards (and
222 * 2 external registers are involved:
223 * pcmcia_status (offset 0x04): bits [0:1/2:3]: read card voltage id
224 * pcmcia_control(offset 0x10):
225 * bits[0:1] set vcc for card
226 * bits[2:3] set vpp for card
227 * bit 4: enable data buffers
228 * bit 7: reset# for card
229 * add 8 for second socket.
231 static int db1x_pcmcia_configure(struct pcmcia_socket
*skt
,
232 struct socket_state_t
*state
)
234 struct db1x_pcmcia_sock
*sock
= to_db1x_socket(skt
);
235 unsigned short cr_clr
, cr_set
;
236 unsigned int changed
;
239 /* card voltage setup */
240 cr_clr
= (0xf << (sock
->nr
* 8)); /* clear voltage settings */
244 switch (state
->Vcc
) {
252 printk(KERN_INFO
"pcmcia%d unsupported Vcc %d\n",
253 sock
->nr
, state
->Vcc
);
256 switch (state
->Vpp
) {
265 printk(KERN_INFO
"pcmcia%d unsupported Vpp %d\n",
266 sock
->nr
, state
->Vpp
);
269 /* sanity check: Vpp must be 0, 12, or Vcc */
270 if (((state
->Vcc
== 33) && (state
->Vpp
== 50)) ||
271 ((state
->Vcc
== 50) && (state
->Vpp
== 33))) {
272 printk(KERN_INFO
"pcmcia%d bad Vcc/Vpp combo (%d %d)\n",
273 sock
->nr
, state
->Vcc
, state
->Vpp
);
278 /* create new voltage code */
279 cr_set
|= ((v
<< 2) | p
) << (sock
->nr
* 8);
281 changed
= state
->flags
^ sock
->old_flags
;
283 if (changed
& SS_RESET
) {
284 if (state
->flags
& SS_RESET
) {
286 /* assert reset, disable io buffers */
287 cr_clr
|= (1 << (7 + (sock
->nr
* 8)));
288 cr_clr
|= (1 << (4 + (sock
->nr
* 8)));
290 /* de-assert reset, enable io buffers */
291 cr_set
|= 1 << (7 + (sock
->nr
* 8));
292 cr_set
|= 1 << (4 + (sock
->nr
* 8));
296 /* update PCMCIA configuration */
297 bcsr_mod(BCSR_PCMCIA
, cr_clr
, cr_set
);
299 sock
->old_flags
= state
->flags
;
301 /* reset was taken away: give card time to initialize properly */
302 if ((changed
& SS_RESET
) && !(state
->flags
& SS_RESET
)) {
310 /* VCC bits at [3:2]/[11:10] */
311 #define GET_VCC(cr, socknr) \
312 ((((cr) >> 2) >> ((socknr) * 8)) & 3)
314 /* VS bits at [0:1]/[3:2] */
315 #define GET_VS(sr, socknr) \
316 (((sr) >> (2 * (socknr))) & 3)
318 /* reset bits at [7]/[15] */
319 #define GET_RESET(cr, socknr) \
320 ((cr) & (1 << (7 + (8 * (socknr)))))
322 static int db1x_pcmcia_get_status(struct pcmcia_socket
*skt
,
325 struct db1x_pcmcia_sock
*sock
= to_db1x_socket(skt
);
326 unsigned short cr
, sr
;
329 status
= db1x_card_inserted(sock
) ? SS_DETECT
: 0;
331 cr
= bcsr_read(BCSR_PCMCIA
);
332 sr
= bcsr_read(BCSR_STATUS
);
334 /* PB1100/PB1500: voltage key bits are at [5:4] */
335 if (sock
->board_type
== BOARD_TYPE_PB1100
)
338 /* determine card type */
339 switch (GET_VS(sr
, sock
->nr
)) {
342 status
|= SS_3VCARD
; /* 3V card */
344 break; /* 5V card: set nothing */
346 status
|= SS_XVCARD
; /* treated as unsupported in core */
349 /* if Vcc is not zero, we have applied power to a card */
350 status
|= GET_VCC(cr
, sock
->nr
) ? SS_POWERON
: 0;
352 /* reset de-asserted? then we're ready */
353 status
|= (GET_RESET(cr
, sock
->nr
)) ? SS_READY
: SS_RESET
;
360 static int db1x_pcmcia_sock_init(struct pcmcia_socket
*skt
)
365 static int db1x_pcmcia_sock_suspend(struct pcmcia_socket
*skt
)
370 static int au1x00_pcmcia_set_io_map(struct pcmcia_socket
*skt
,
371 struct pccard_io_map
*map
)
373 struct db1x_pcmcia_sock
*sock
= to_db1x_socket(skt
);
375 map
->start
= (u32
)sock
->virt_io
;
376 map
->stop
= map
->start
+ IO_MAP_SIZE
;
381 static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket
*skt
,
382 struct pccard_mem_map
*map
)
384 struct db1x_pcmcia_sock
*sock
= to_db1x_socket(skt
);
386 if (map
->flags
& MAP_ATTRIB
)
387 map
->static_start
= sock
->phys_attr
+ map
->card_start
;
389 map
->static_start
= sock
->phys_mem
+ map
->card_start
;
394 static struct pccard_operations db1x_pcmcia_operations
= {
395 .init
= db1x_pcmcia_sock_init
,
396 .suspend
= db1x_pcmcia_sock_suspend
,
397 .get_status
= db1x_pcmcia_get_status
,
398 .set_socket
= db1x_pcmcia_configure
,
399 .set_io_map
= au1x00_pcmcia_set_io_map
,
400 .set_mem_map
= au1x00_pcmcia_set_mem_map
,
403 static int __devinit
db1x_pcmcia_socket_probe(struct platform_device
*pdev
)
405 struct db1x_pcmcia_sock
*sock
;
409 sock
= kzalloc(sizeof(struct db1x_pcmcia_sock
), GFP_KERNEL
);
415 bid
= BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI
));
417 case BCSR_WHOAMI_PB1500
:
418 case BCSR_WHOAMI_PB1500R2
:
419 case BCSR_WHOAMI_PB1100
:
420 sock
->board_type
= BOARD_TYPE_PB1100
;
422 case BCSR_WHOAMI_DB1000
... BCSR_WHOAMI_PB1550_SDR
:
423 sock
->board_type
= BOARD_TYPE_DEFAULT
;
425 case BCSR_WHOAMI_PB1200
... BCSR_WHOAMI_DB1200
:
426 sock
->board_type
= BOARD_TYPE_DB1200
;
429 printk(KERN_INFO
"db1xxx-ss: unknown board %d!\n", bid
);
435 * gather resources necessary and optional nice-to-haves to
437 * This includes IRQs for Carddetection/ejection, the card
438 * itself and optional status change detection.
439 * Also, the memory areas covered by a socket. For these
440 * we require the real 36bit addresses (see the au1000.h
441 * header for more information).
444 /* card: irq assigned to the card itself. */
445 r
= platform_get_resource_byname(pdev
, IORESOURCE_IRQ
, "card");
446 sock
->card_irq
= r
? r
->start
: 0;
448 /* insert: irq which triggers on card insertion/ejection */
449 r
= platform_get_resource_byname(pdev
, IORESOURCE_IRQ
, "insert");
450 sock
->insert_irq
= r
? r
->start
: -1;
452 /* stschg: irq which trigger on card status change (optional) */
453 r
= platform_get_resource_byname(pdev
, IORESOURCE_IRQ
, "stschg");
454 sock
->stschg_irq
= r
? r
->start
: -1;
456 /* eject: irq which triggers on ejection (DB1200/PB1200 only) */
457 r
= platform_get_resource_byname(pdev
, IORESOURCE_IRQ
, "eject");
458 sock
->eject_irq
= r
? r
->start
: -1;
462 /* 36bit PCMCIA Attribute area address */
463 r
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, "pcmcia-attr");
465 printk(KERN_ERR
"pcmcia%d has no 'pseudo-attr' resource!\n",
469 sock
->phys_attr
= r
->start
;
471 /* 36bit PCMCIA Memory area address */
472 r
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, "pcmcia-mem");
474 printk(KERN_ERR
"pcmcia%d has no 'pseudo-mem' resource!\n",
478 sock
->phys_mem
= r
->start
;
480 /* 36bit PCMCIA IO area address */
481 r
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, "pcmcia-io");
483 printk(KERN_ERR
"pcmcia%d has no 'pseudo-io' resource!\n",
487 sock
->phys_io
= r
->start
;
490 * PCMCIA client drivers use the inb/outb macros to access
491 * the IO registers. Since mips_io_port_base is added
492 * to the access address of the mips implementation of
493 * inb/outb, we need to subtract it here because we want
494 * to access the I/O or MEM address directly, without
495 * going through this "mips_io_port_base" mechanism.
497 sock
->virt_io
= (void *)(ioremap(sock
->phys_io
, IO_MAP_SIZE
) -
500 if (!sock
->virt_io
) {
501 printk(KERN_ERR
"pcmcia%d: cannot remap IO area\n",
507 sock
->socket
.ops
= &db1x_pcmcia_operations
;
508 sock
->socket
.owner
= THIS_MODULE
;
509 sock
->socket
.pci_irq
= sock
->card_irq
;
510 sock
->socket
.features
= SS_CAP_STATIC_MAP
| SS_CAP_PCCARD
;
511 sock
->socket
.map_size
= MEM_MAP_SIZE
;
512 sock
->socket
.io_offset
= (unsigned long)sock
->virt_io
;
513 sock
->socket
.dev
.parent
= &pdev
->dev
;
514 sock
->socket
.resource_ops
= &pccard_static_ops
;
516 platform_set_drvdata(pdev
, sock
);
518 ret
= db1x_pcmcia_setup_irqs(sock
);
520 printk(KERN_ERR
"pcmcia%d cannot setup interrupts\n",
527 ret
= pcmcia_register_socket(&sock
->socket
);
529 printk(KERN_ERR
"pcmcia%d failed to register\n", sock
->nr
);
533 printk(KERN_INFO
"Alchemy Db/Pb1xxx pcmcia%d @ io/attr/mem %09llx"
534 "(%p) %09llx %09llx card/insert/stschg/eject irqs @ %d "
535 "%d %d %d\n", sock
->nr
, sock
->phys_io
, sock
->virt_io
,
536 sock
->phys_attr
, sock
->phys_mem
, sock
->card_irq
,
537 sock
->insert_irq
, sock
->stschg_irq
, sock
->eject_irq
);
542 db1x_pcmcia_free_irqs(sock
);
544 iounmap((void *)(sock
->virt_io
+ (u32
)mips_io_port_base
));
550 static int __devexit
db1x_pcmcia_socket_remove(struct platform_device
*pdev
)
552 struct db1x_pcmcia_sock
*sock
= platform_get_drvdata(pdev
);
554 db1x_pcmcia_free_irqs(sock
);
555 pcmcia_unregister_socket(&sock
->socket
);
556 iounmap((void *)(sock
->virt_io
+ (u32
)mips_io_port_base
));
562 static struct platform_driver db1x_pcmcia_socket_driver
= {
564 .name
= "db1xxx_pcmcia",
565 .owner
= THIS_MODULE
,
567 .probe
= db1x_pcmcia_socket_probe
,
568 .remove
= __devexit_p(db1x_pcmcia_socket_remove
),
571 int __init
db1x_pcmcia_socket_load(void)
573 return platform_driver_register(&db1x_pcmcia_socket_driver
);
576 void __exit
db1x_pcmcia_socket_unload(void)
578 platform_driver_unregister(&db1x_pcmcia_socket_driver
);
581 module_init(db1x_pcmcia_socket_load
);
582 module_exit(db1x_pcmcia_socket_unload
);
584 MODULE_LICENSE("GPL");
585 MODULE_DESCRIPTION("PCMCIA Socket Services for Alchemy Db/Pb1x00 boards");
586 MODULE_AUTHOR("Manuel Lauss");