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/module.h>
28 #include <linux/platform_device.h>
29 #include <linux/resource.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.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)
150 if (sock->stschg_irq != -1) {
151 ret = request_irq(sock->stschg_irq, db1000_pcmcia_stschgirq,
152 0, "pcmcia_stschg", sock);
157 /* Db/Pb1200 have separate per-socket insertion and ejection
158 * interrupts, which should show edge behaviour but don't.
159 * So interrupts are disabled until both insertion and
160 * ejection handler have been registered and the currently
161 * active one disabled.
163 if (sock->board_type == BOARD_TYPE_DB1200) {
164 ret = request_irq(sock->insert_irq, db1200_pcmcia_cdirq,
165 IRQF_DISABLED, "pcmcia_insert", sock);
169 ret = request_irq(sock->eject_irq, db1200_pcmcia_cdirq,
170 IRQF_DISABLED, "pcmcia_eject", sock);
172 free_irq(sock->insert_irq, sock);
176 /* enable the currently silent one */
177 if (db1200_card_inserted(sock))
178 enable_irq(sock->eject_irq);
180 enable_irq(sock->insert_irq);
182 /* all other (older) Db1x00 boards use a GPIO to show
183 * card detection status: use both-edge triggers.
185 irq_set_irq_type(sock->insert_irq, IRQ_TYPE_EDGE_BOTH);
186 ret = request_irq(sock->insert_irq, db1000_pcmcia_cdirq,
187 0, "pcmcia_carddetect", sock);
193 return 0; /* all done */
196 if (sock->stschg_irq != -1)
197 free_irq(sock->stschg_irq, sock);
202 static void db1x_pcmcia_free_irqs(struct db1x_pcmcia_sock *sock)
204 if (sock->stschg_irq != -1)
205 free_irq(sock->stschg_irq, sock);
207 free_irq(sock->insert_irq, sock);
208 if (sock->eject_irq != -1)
209 free_irq(sock->eject_irq, sock);
213 * configure a PCMCIA socket on the Db1x00 series of boards (and
216 * 2 external registers are involved:
217 * pcmcia_status (offset 0x04): bits [0:1/2:3]: read card voltage id
218 * pcmcia_control(offset 0x10):
219 * bits[0:1] set vcc for card
220 * bits[2:3] set vpp for card
221 * bit 4: enable data buffers
222 * bit 7: reset# for card
223 * add 8 for second socket.
225 static int db1x_pcmcia_configure(struct pcmcia_socket *skt,
226 struct socket_state_t *state)
228 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
229 unsigned short cr_clr, cr_set;
230 unsigned int changed;
233 /* card voltage setup */
234 cr_clr = (0xf << (sock->nr * 8)); /* clear voltage settings */
238 switch (state->Vcc) {
246 printk(KERN_INFO "pcmcia%d unsupported Vcc %d\n",
247 sock->nr, state->Vcc);
250 switch (state->Vpp) {
259 printk(KERN_INFO "pcmcia%d unsupported Vpp %d\n",
260 sock->nr, state->Vpp);
263 /* sanity check: Vpp must be 0, 12, or Vcc */
264 if (((state->Vcc == 33) && (state->Vpp == 50)) ||
265 ((state->Vcc == 50) && (state->Vpp == 33))) {
266 printk(KERN_INFO "pcmcia%d bad Vcc/Vpp combo (%d %d)\n",
267 sock->nr, state->Vcc, state->Vpp);
272 /* create new voltage code */
273 cr_set |= ((v << 2) | p) << (sock->nr * 8);
275 changed = state->flags ^ sock->old_flags;
277 if (changed & SS_RESET) {
278 if (state->flags & SS_RESET) {
280 /* assert reset, disable io buffers */
281 cr_clr |= (1 << (7 + (sock->nr * 8)));
282 cr_clr |= (1 << (4 + (sock->nr * 8)));
284 /* de-assert reset, enable io buffers */
285 cr_set |= 1 << (7 + (sock->nr * 8));
286 cr_set |= 1 << (4 + (sock->nr * 8));
290 /* update PCMCIA configuration */
291 bcsr_mod(BCSR_PCMCIA, cr_clr, cr_set);
293 sock->old_flags = state->flags;
295 /* reset was taken away: give card time to initialize properly */
296 if ((changed & SS_RESET) && !(state->flags & SS_RESET)) {
304 /* VCC bits at [3:2]/[11:10] */
305 #define GET_VCC(cr, socknr) \
306 ((((cr) >> 2) >> ((socknr) * 8)) & 3)
308 /* VS bits at [0:1]/[3:2] */
309 #define GET_VS(sr, socknr) \
310 (((sr) >> (2 * (socknr))) & 3)
312 /* reset bits at [7]/[15] */
313 #define GET_RESET(cr, socknr) \
314 ((cr) & (1 << (7 + (8 * (socknr)))))
316 static int db1x_pcmcia_get_status(struct pcmcia_socket *skt,
319 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
320 unsigned short cr, sr;
323 status = db1x_card_inserted(sock) ? SS_DETECT : 0;
325 cr = bcsr_read(BCSR_PCMCIA);
326 sr = bcsr_read(BCSR_STATUS);
328 /* PB1100/PB1500: voltage key bits are at [5:4] */
329 if (sock->board_type == BOARD_TYPE_PB1100)
332 /* determine card type */
333 switch (GET_VS(sr, sock->nr)) {
336 status |= SS_3VCARD; /* 3V card */
338 break; /* 5V card: set nothing */
340 status |= SS_XVCARD; /* treated as unsupported in core */
343 /* if Vcc is not zero, we have applied power to a card */
344 status |= GET_VCC(cr, sock->nr) ? SS_POWERON : 0;
346 /* reset de-asserted? then we're ready */
347 status |= (GET_RESET(cr, sock->nr)) ? SS_READY : SS_RESET;
354 static int db1x_pcmcia_sock_init(struct pcmcia_socket *skt)
359 static int db1x_pcmcia_sock_suspend(struct pcmcia_socket *skt)
364 static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
365 struct pccard_io_map *map)
367 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
369 map->start = (u32)sock->virt_io;
370 map->stop = map->start + IO_MAP_SIZE;
375 static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
376 struct pccard_mem_map *map)
378 struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
380 if (map->flags & MAP_ATTRIB)
381 map->static_start = sock->phys_attr + map->card_start;
383 map->static_start = sock->phys_mem + map->card_start;
388 static struct pccard_operations db1x_pcmcia_operations = {
389 .init = db1x_pcmcia_sock_init,
390 .suspend = db1x_pcmcia_sock_suspend,
391 .get_status = db1x_pcmcia_get_status,
392 .set_socket = db1x_pcmcia_configure,
393 .set_io_map = au1x00_pcmcia_set_io_map,
394 .set_mem_map = au1x00_pcmcia_set_mem_map,
397 static int __devinit db1x_pcmcia_socket_probe(struct platform_device *pdev)
399 struct db1x_pcmcia_sock *sock;
403 sock = kzalloc(sizeof(struct db1x_pcmcia_sock), GFP_KERNEL);
409 bid = BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI));
411 case BCSR_WHOAMI_PB1500:
412 case BCSR_WHOAMI_PB1500R2:
413 case BCSR_WHOAMI_PB1100:
414 sock->board_type = BOARD_TYPE_PB1100;
416 case BCSR_WHOAMI_DB1000 ... BCSR_WHOAMI_PB1550_SDR:
417 sock->board_type = BOARD_TYPE_DEFAULT;
419 case BCSR_WHOAMI_PB1200 ... BCSR_WHOAMI_DB1200:
420 sock->board_type = BOARD_TYPE_DB1200;
423 printk(KERN_INFO "db1xxx-ss: unknown board %d!\n", bid);
429 * gather resources necessary and optional nice-to-haves to
431 * This includes IRQs for Carddetection/ejection, the card
432 * itself and optional status change detection.
433 * Also, the memory areas covered by a socket. For these
434 * we require the real 36bit addresses (see the au1000.h
435 * header for more information).
438 /* card: irq assigned to the card itself. */
439 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "card");
440 sock->card_irq = r ? r->start : 0;
442 /* insert: irq which triggers on card insertion/ejection */
443 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "insert");
444 sock->insert_irq = r ? r->start : -1;
446 /* stschg: irq which trigger on card status change (optional) */
447 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "stschg");
448 sock->stschg_irq = r ? r->start : -1;
450 /* eject: irq which triggers on ejection (DB1200/PB1200 only) */
451 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "eject");
452 sock->eject_irq = r ? r->start : -1;
456 /* 36bit PCMCIA Attribute area address */
457 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
459 printk(KERN_ERR "pcmcia%d has no 'pseudo-attr' resource!\n",
463 sock->phys_attr = r->start;
465 /* 36bit PCMCIA Memory area address */
466 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
468 printk(KERN_ERR "pcmcia%d has no 'pseudo-mem' resource!\n",
472 sock->phys_mem = r->start;
474 /* 36bit PCMCIA IO area address */
475 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
477 printk(KERN_ERR "pcmcia%d has no 'pseudo-io' resource!\n",
481 sock->phys_io = r->start;
484 * PCMCIA client drivers use the inb/outb macros to access
485 * the IO registers. Since mips_io_port_base is added
486 * to the access address of the mips implementation of
487 * inb/outb, we need to subtract it here because we want
488 * to access the I/O or MEM address directly, without
489 * going through this "mips_io_port_base" mechanism.
491 sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
494 if (!sock->virt_io) {
495 printk(KERN_ERR "pcmcia%d: cannot remap IO area\n",
501 sock->socket.ops = &db1x_pcmcia_operations;
502 sock->socket.owner = THIS_MODULE;
503 sock->socket.pci_irq = sock->card_irq;
504 sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
505 sock->socket.map_size = MEM_MAP_SIZE;
506 sock->socket.io_offset = (unsigned long)sock->virt_io;
507 sock->socket.dev.parent = &pdev->dev;
508 sock->socket.resource_ops = &pccard_static_ops;
510 platform_set_drvdata(pdev, sock);
512 ret = db1x_pcmcia_setup_irqs(sock);
514 printk(KERN_ERR "pcmcia%d cannot setup interrupts\n",
521 ret = pcmcia_register_socket(&sock->socket);
523 printk(KERN_ERR "pcmcia%d failed to register\n", sock->nr);
527 printk(KERN_INFO "Alchemy Db/Pb1xxx pcmcia%d @ io/attr/mem %09llx"
528 "(%p) %09llx %09llx card/insert/stschg/eject irqs @ %d "
529 "%d %d %d\n", sock->nr, sock->phys_io, sock->virt_io,
530 sock->phys_attr, sock->phys_mem, sock->card_irq,
531 sock->insert_irq, sock->stschg_irq, sock->eject_irq);
536 db1x_pcmcia_free_irqs(sock);
538 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
544 static int __devexit db1x_pcmcia_socket_remove(struct platform_device *pdev)
546 struct db1x_pcmcia_sock *sock = platform_get_drvdata(pdev);
548 db1x_pcmcia_free_irqs(sock);
549 pcmcia_unregister_socket(&sock->socket);
550 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
556 static struct platform_driver db1x_pcmcia_socket_driver = {
558 .name = "db1xxx_pcmcia",
559 .owner = THIS_MODULE,
561 .probe = db1x_pcmcia_socket_probe,
562 .remove = __devexit_p(db1x_pcmcia_socket_remove),
565 int __init db1x_pcmcia_socket_load(void)
567 return platform_driver_register(&db1x_pcmcia_socket_driver);
570 void __exit db1x_pcmcia_socket_unload(void)
572 platform_driver_unregister(&db1x_pcmcia_socket_driver);
575 module_init(db1x_pcmcia_socket_load);
576 module_exit(db1x_pcmcia_socket_unload);
578 MODULE_LICENSE("GPL");
579 MODULE_DESCRIPTION("PCMCIA Socket Services for Alchemy Db/Pb1x00 boards");
580 MODULE_AUTHOR("Manuel Lauss");