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, Db1300
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!
21 * - Db1300: Db1200-like, no pwr ctrl, single socket (#1).
24 #include <linux/delay.h>
25 #include <linux/gpio.h>
26 #include <linux/interrupt.h>
28 #include <linux/module.h>
29 #include <linux/platform_device.h>
30 #include <linux/resource.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
34 #include <pcmcia/ss.h>
36 #include <asm/mach-au1x00/au1000.h>
37 #include <asm/mach-db1x00/bcsr.h>
39 #define MEM_MAP_SIZE 0x400000
40 #define IO_MAP_SIZE 0x1000
42 struct db1x_pcmcia_sock {
43 struct pcmcia_socket socket;
44 int nr; /* socket number */
48 phys_addr_t phys_attr;
51 /* previous flags for set_socket() */
52 unsigned int old_flags;
54 /* interrupt sources: linux irq numbers! */
55 int insert_irq; /* default carddetect irq */
56 int stschg_irq; /* card-status-change irq */
57 int card_irq; /* card irq */
58 int eject_irq; /* db1200/pb1200 have these */
60 #define BOARD_TYPE_DEFAULT 0 /* most boards */
61 #define BOARD_TYPE_DB1200 1 /* IRQs aren't gpios */
62 #define BOARD_TYPE_PB1100 2 /* VS bits slightly different */
63 #define BOARD_TYPE_DB1300 3 /* no power control */
67 #define to_db1x_socket(x) container_of(x, struct db1x_pcmcia_sock, socket)
69 static int db1300_card_inserted(struct db1x_pcmcia_sock *sock)
71 return bcsr_read(BCSR_SIGSTAT) & (1 << 8);
74 /* DB/PB1200: check CPLD SIGSTATUS register bit 10/12 */
75 static int db1200_card_inserted(struct db1x_pcmcia_sock *sock)
77 unsigned short sigstat;
79 sigstat = bcsr_read(BCSR_SIGSTAT);
80 return sigstat & 1 << (8 + 2 * sock->nr);
83 /* carddetect gpio: low-active */
84 static int db1000_card_inserted(struct db1x_pcmcia_sock *sock)
86 return !gpio_get_value(irq_to_gpio(sock->insert_irq));
89 static int db1x_card_inserted(struct db1x_pcmcia_sock *sock)
91 switch (sock->board_type) {
92 case BOARD_TYPE_DB1200:
93 return db1200_card_inserted(sock);
94 case BOARD_TYPE_DB1300:
95 return db1300_card_inserted(sock);
97 return db1000_card_inserted(sock);
101 /* STSCHG tends to bounce heavily when cards are inserted/ejected.
102 * To avoid this, the interrupt is normally disabled and only enabled
103 * after reset to a card has been de-asserted.
105 static inline void set_stschg(struct db1x_pcmcia_sock *sock, int en)
107 if (sock->stschg_irq != -1) {
109 enable_irq(sock->stschg_irq);
111 disable_irq(sock->stschg_irq);
115 static irqreturn_t db1000_pcmcia_cdirq(int irq, void *data)
117 struct db1x_pcmcia_sock *sock = data;
119 pcmcia_parse_events(&sock->socket, SS_DETECT);
124 static irqreturn_t db1000_pcmcia_stschgirq(int irq, void *data)
126 struct db1x_pcmcia_sock *sock = data;
128 pcmcia_parse_events(&sock->socket, SS_STSCHG);
133 static irqreturn_t db1200_pcmcia_cdirq(int irq, void *data)
135 struct db1x_pcmcia_sock *sock = data;
137 /* Db/Pb1200 have separate per-socket insertion and ejection
138 * interrupts which stay asserted as long as the card is
139 * inserted/missing. The one which caused us to be called
140 * needs to be disabled and the other one enabled.
142 if (irq == sock->insert_irq) {
143 disable_irq_nosync(sock->insert_irq);
144 enable_irq(sock->eject_irq);
146 disable_irq_nosync(sock->eject_irq);
147 enable_irq(sock->insert_irq);
150 pcmcia_parse_events(&sock->socket, SS_DETECT);
155 static int db1x_pcmcia_setup_irqs(struct db1x_pcmcia_sock *sock)
159 if (sock->stschg_irq != -1) {
160 ret = request_irq(sock->stschg_irq, db1000_pcmcia_stschgirq,
161 0, "pcmcia_stschg", sock);
166 /* Db/Pb1200 have separate per-socket insertion and ejection
167 * interrupts, which should show edge behaviour but don't.
168 * So interrupts are disabled until both insertion and
169 * ejection handler have been registered and the currently
170 * active one disabled.
172 if ((sock->board_type == BOARD_TYPE_DB1200) ||
173 (sock->board_type == BOARD_TYPE_DB1300)) {
174 ret = request_irq(sock->insert_irq, db1200_pcmcia_cdirq,
175 0, "pcmcia_insert", sock);
179 ret = request_irq(sock->eject_irq, db1200_pcmcia_cdirq,
180 0, "pcmcia_eject", sock);
182 free_irq(sock->insert_irq, sock);
186 /* enable the currently silent one */
187 if (db1x_card_inserted(sock))
188 enable_irq(sock->eject_irq);
190 enable_irq(sock->insert_irq);
192 /* all other (older) Db1x00 boards use a GPIO to show
193 * card detection status: use both-edge triggers.
195 irq_set_irq_type(sock->insert_irq, IRQ_TYPE_EDGE_BOTH);
196 ret = request_irq(sock->insert_irq, db1000_pcmcia_cdirq,
197 0, "pcmcia_carddetect", sock);
203 return 0; /* all done */
206 if (sock->stschg_irq != -1)
207 free_irq(sock->stschg_irq, sock);
212 static void db1x_pcmcia_free_irqs(struct db1x_pcmcia_sock *sock)
214 if (sock->stschg_irq != -1)
215 free_irq(sock->stschg_irq, sock);
217 free_irq(sock->insert_irq, sock);
218 if (sock->eject_irq != -1)
219 free_irq(sock->eject_irq, sock);
223 * configure a PCMCIA socket on the Db1x00 series of boards (and
226 * 2 external registers are involved:
227 * pcmcia_status (offset 0x04): bits [0:1/2:3]: read card voltage id
228 * pcmcia_control(offset 0x10):
229 * bits[0:1] set vcc for card
230 * bits[2:3] set vpp for card
231 * bit 4: enable data buffers
232 * bit 7: reset# for card
233 * add 8 for second socket.
235 static int db1x_pcmcia_configure(struct pcmcia_socket *skt,
236 struct socket_state_t *state)
238 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
239 unsigned short cr_clr, cr_set;
240 unsigned int changed;
243 /* card voltage setup */
244 cr_clr = (0xf << (sock->nr * 8)); /* clear voltage settings */
248 switch (state->Vcc) {
256 printk(KERN_INFO "pcmcia%d unsupported Vcc %d\n",
257 sock->nr, state->Vcc);
260 switch (state->Vpp) {
269 printk(KERN_INFO "pcmcia%d unsupported Vpp %d\n",
270 sock->nr, state->Vpp);
273 /* sanity check: Vpp must be 0, 12, or Vcc */
274 if (((state->Vcc == 33) && (state->Vpp == 50)) ||
275 ((state->Vcc == 50) && (state->Vpp == 33))) {
276 printk(KERN_INFO "pcmcia%d bad Vcc/Vpp combo (%d %d)\n",
277 sock->nr, state->Vcc, state->Vpp);
282 /* create new voltage code */
283 if (sock->board_type != BOARD_TYPE_DB1300)
284 cr_set |= ((v << 2) | p) << (sock->nr * 8);
286 changed = state->flags ^ sock->old_flags;
288 if (changed & SS_RESET) {
289 if (state->flags & SS_RESET) {
291 /* assert reset, disable io buffers */
292 cr_clr |= (1 << (7 + (sock->nr * 8)));
293 cr_clr |= (1 << (4 + (sock->nr * 8)));
295 /* de-assert reset, enable io buffers */
296 cr_set |= 1 << (7 + (sock->nr * 8));
297 cr_set |= 1 << (4 + (sock->nr * 8));
301 /* update PCMCIA configuration */
302 bcsr_mod(BCSR_PCMCIA, cr_clr, cr_set);
304 sock->old_flags = state->flags;
306 /* reset was taken away: give card time to initialize properly */
307 if ((changed & SS_RESET) && !(state->flags & SS_RESET)) {
315 /* VCC bits at [3:2]/[11:10] */
316 #define GET_VCC(cr, socknr) \
317 ((((cr) >> 2) >> ((socknr) * 8)) & 3)
319 /* VS bits at [0:1]/[3:2] */
320 #define GET_VS(sr, socknr) \
321 (((sr) >> (2 * (socknr))) & 3)
323 /* reset bits at [7]/[15] */
324 #define GET_RESET(cr, socknr) \
325 ((cr) & (1 << (7 + (8 * (socknr)))))
327 static int db1x_pcmcia_get_status(struct pcmcia_socket *skt,
330 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
331 unsigned short cr, sr;
334 status = db1x_card_inserted(sock) ? SS_DETECT : 0;
336 cr = bcsr_read(BCSR_PCMCIA);
337 sr = bcsr_read(BCSR_STATUS);
339 /* PB1100/PB1500: voltage key bits are at [5:4] */
340 if (sock->board_type == BOARD_TYPE_PB1100)
343 /* determine card type */
344 switch (GET_VS(sr, sock->nr)) {
347 status |= SS_3VCARD; /* 3V card */
349 break; /* 5V card: set nothing */
351 status |= SS_XVCARD; /* treated as unsupported in core */
354 /* if Vcc is not zero, we have applied power to a card */
355 status |= GET_VCC(cr, sock->nr) ? SS_POWERON : 0;
357 /* DB1300: power always on, but don't tell when no card present */
358 if ((sock->board_type == BOARD_TYPE_DB1300) && (status & SS_DETECT))
359 status = SS_POWERON | SS_3VCARD | SS_DETECT;
361 /* reset de-asserted? then we're ready */
362 status |= (GET_RESET(cr, sock->nr)) ? SS_READY : SS_RESET;
369 static int db1x_pcmcia_sock_init(struct pcmcia_socket *skt)
374 static int db1x_pcmcia_sock_suspend(struct pcmcia_socket *skt)
379 static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
380 struct pccard_io_map *map)
382 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
384 map->start = (u32)sock->virt_io;
385 map->stop = map->start + IO_MAP_SIZE;
390 static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
391 struct pccard_mem_map *map)
393 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
395 if (map->flags & MAP_ATTRIB)
396 map->static_start = sock->phys_attr + map->card_start;
398 map->static_start = sock->phys_mem + map->card_start;
403 static struct pccard_operations db1x_pcmcia_operations = {
404 .init = db1x_pcmcia_sock_init,
405 .suspend = db1x_pcmcia_sock_suspend,
406 .get_status = db1x_pcmcia_get_status,
407 .set_socket = db1x_pcmcia_configure,
408 .set_io_map = au1x00_pcmcia_set_io_map,
409 .set_mem_map = au1x00_pcmcia_set_mem_map,
412 static int db1x_pcmcia_socket_probe(struct platform_device *pdev)
414 struct db1x_pcmcia_sock *sock;
418 sock = kzalloc(sizeof(struct db1x_pcmcia_sock), GFP_KERNEL);
424 bid = BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI));
426 case BCSR_WHOAMI_PB1500:
427 case BCSR_WHOAMI_PB1500R2:
428 case BCSR_WHOAMI_PB1100:
429 sock->board_type = BOARD_TYPE_PB1100;
431 case BCSR_WHOAMI_DB1000 ... BCSR_WHOAMI_PB1550_SDR:
432 sock->board_type = BOARD_TYPE_DEFAULT;
434 case BCSR_WHOAMI_PB1200 ... BCSR_WHOAMI_DB1200:
435 sock->board_type = BOARD_TYPE_DB1200;
437 case BCSR_WHOAMI_DB1300:
438 sock->board_type = BOARD_TYPE_DB1300;
441 printk(KERN_INFO "db1xxx-ss: unknown board %d!\n", bid);
447 * gather resources necessary and optional nice-to-haves to
449 * This includes IRQs for Carddetection/ejection, the card
450 * itself and optional status change detection.
451 * Also, the memory areas covered by a socket. For these
452 * we require the real 36bit addresses (see the au1000.h
453 * header for more information).
456 /* card: irq assigned to the card itself. */
457 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "card");
458 sock->card_irq = r ? r->start : 0;
460 /* insert: irq which triggers on card insertion/ejection */
461 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "insert");
462 sock->insert_irq = r ? r->start : -1;
464 /* stschg: irq which trigger on card status change (optional) */
465 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "stschg");
466 sock->stschg_irq = r ? r->start : -1;
468 /* eject: irq which triggers on ejection (DB1200/PB1200 only) */
469 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "eject");
470 sock->eject_irq = r ? r->start : -1;
474 /* 36bit PCMCIA Attribute area address */
475 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
477 printk(KERN_ERR "pcmcia%d has no 'pseudo-attr' resource!\n",
481 sock->phys_attr = r->start;
483 /* 36bit PCMCIA Memory area address */
484 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
486 printk(KERN_ERR "pcmcia%d has no 'pseudo-mem' resource!\n",
490 sock->phys_mem = r->start;
492 /* 36bit PCMCIA IO area address */
493 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
495 printk(KERN_ERR "pcmcia%d has no 'pseudo-io' resource!\n",
499 sock->phys_io = r->start;
502 * PCMCIA client drivers use the inb/outb macros to access
503 * the IO registers. Since mips_io_port_base is added
504 * to the access address of the mips implementation of
505 * inb/outb, we need to subtract it here because we want
506 * to access the I/O or MEM address directly, without
507 * going through this "mips_io_port_base" mechanism.
509 sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
512 if (!sock->virt_io) {
513 printk(KERN_ERR "pcmcia%d: cannot remap IO area\n",
519 sock->socket.ops = &db1x_pcmcia_operations;
520 sock->socket.owner = THIS_MODULE;
521 sock->socket.pci_irq = sock->card_irq;
522 sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
523 sock->socket.map_size = MEM_MAP_SIZE;
524 sock->socket.io_offset = (unsigned long)sock->virt_io;
525 sock->socket.dev.parent = &pdev->dev;
526 sock->socket.resource_ops = &pccard_static_ops;
528 platform_set_drvdata(pdev, sock);
530 ret = db1x_pcmcia_setup_irqs(sock);
532 printk(KERN_ERR "pcmcia%d cannot setup interrupts\n",
539 ret = pcmcia_register_socket(&sock->socket);
541 printk(KERN_ERR "pcmcia%d failed to register\n", sock->nr);
545 printk(KERN_INFO "Alchemy Db/Pb1xxx pcmcia%d @ io/attr/mem %09llx"
546 "(%p) %09llx %09llx card/insert/stschg/eject irqs @ %d "
547 "%d %d %d\n", sock->nr, sock->phys_io, sock->virt_io,
548 sock->phys_attr, sock->phys_mem, sock->card_irq,
549 sock->insert_irq, sock->stschg_irq, sock->eject_irq);
554 db1x_pcmcia_free_irqs(sock);
556 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
562 static int db1x_pcmcia_socket_remove(struct platform_device *pdev)
564 struct db1x_pcmcia_sock *sock = platform_get_drvdata(pdev);
566 db1x_pcmcia_free_irqs(sock);
567 pcmcia_unregister_socket(&sock->socket);
568 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
574 static struct platform_driver db1x_pcmcia_socket_driver = {
576 .name = "db1xxx_pcmcia",
577 .owner = THIS_MODULE,
579 .probe = db1x_pcmcia_socket_probe,
580 .remove = db1x_pcmcia_socket_remove,
583 module_platform_driver(db1x_pcmcia_socket_driver);
585 MODULE_LICENSE("GPL");
586 MODULE_DESCRIPTION("PCMCIA Socket Services for Alchemy Db/Pb1x00 boards");
587 MODULE_AUTHOR("Manuel Lauss");