2 * at91_cf.c -- AT91 CompactFlash controller driver
4 * Copyright (C) 2005 David Brownell
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/platform_device.h>
15 #include <linux/errno.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/slab.h>
19 #include <linux/gpio.h>
20 #include <linux/platform_data/atmel.h>
22 #include <pcmcia/ss.h>
24 #include <mach/hardware.h>
26 #include <asm/sizes.h>
28 #include <mach/at91rm9200_mc.h>
29 #include <mach/at91_ramc.h>
33 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
34 * some other bit in {A24,A22..A11} is nREG to flag memory access
35 * (vs attributes). So more than 2KB/region would just be waste.
36 * Note: These are offsets from the physical base address.
38 #define CF_ATTR_PHYS (0)
39 #define CF_IO_PHYS (1 << 23)
40 #define CF_MEM_PHYS (0x017ff800)
42 /*--------------------------------------------------------------------------*/
44 static const char driver_name[] = "at91_cf";
46 struct at91_cf_socket {
47 struct pcmcia_socket socket;
51 struct platform_device *pdev;
52 struct at91_cf_data *board;
54 unsigned long phys_baseaddr;
57 static inline int at91_cf_present(struct at91_cf_socket *cf)
59 return !gpio_get_value(cf->board->det_pin);
62 /*--------------------------------------------------------------------------*/
64 static int at91_cf_ss_init(struct pcmcia_socket *s)
69 static irqreturn_t at91_cf_irq(int irq, void *_cf)
71 struct at91_cf_socket *cf = _cf;
73 if (irq == gpio_to_irq(cf->board->det_pin)) {
74 unsigned present = at91_cf_present(cf);
76 /* kick pccard as needed */
77 if (present != cf->present) {
78 cf->present = present;
79 pr_debug("%s: card %s\n", driver_name,
80 present ? "present" : "gone");
81 pcmcia_parse_events(&cf->socket, SS_DETECT);
88 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
90 struct at91_cf_socket *cf;
95 cf = container_of(s, struct at91_cf_socket, socket);
97 /* NOTE: CF is always 3VCARD */
98 if (at91_cf_present(cf)) {
99 int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
100 int vcc = gpio_is_valid(cf->board->vcc_pin);
102 *sp = SS_DETECT | SS_3VCARD;
103 if (!rdy || gpio_get_value(rdy))
105 if (!vcc || gpio_get_value(vcc))
114 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
116 struct at91_cf_socket *cf;
118 cf = container_of(sock, struct at91_cf_socket, socket);
120 /* switch Vcc if needed and possible */
121 if (gpio_is_valid(cf->board->vcc_pin)) {
124 gpio_set_value(cf->board->vcc_pin, 0);
127 gpio_set_value(cf->board->vcc_pin, 1);
134 /* toggle reset if needed */
135 gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
137 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
138 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
143 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
145 return at91_cf_set_socket(s, &dead_socket);
148 /* we already mapped the I/O region */
149 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
151 struct at91_cf_socket *cf;
154 cf = container_of(s, struct at91_cf_socket, socket);
155 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
158 * Use 16 bit accesses unless/until we need 8-bit i/o space.
160 csr = at91_ramc_read(0, AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
163 * NOTE: this CF controller ignores IOIS16, so we can't really do
164 * MAP_AUTOSZ. The 16bit mode allows single byte access on either
165 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
166 * purposes (and handles ide-cs).
168 * The 8bit mode is needed for odd byte access on D0-D7. It seems
169 * some cards only like that way to get at the odd byte, despite
170 * CF 3.0 spec table 35 also giving the D8-D15 option.
172 if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
173 csr |= AT91_SMC_DBW_8;
174 pr_debug("%s: 8bit i/o bus\n", driver_name);
176 csr |= AT91_SMC_DBW_16;
177 pr_debug("%s: 16bit i/o bus\n", driver_name);
179 at91_ramc_write(0, AT91_SMC_CSR(cf->board->chipselect), csr);
181 io->start = cf->socket.io_offset;
182 io->stop = io->start + SZ_2K - 1;
187 /* pcmcia layer maps/unmaps mem regions */
189 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
191 struct at91_cf_socket *cf;
196 cf = container_of(s, struct at91_cf_socket, socket);
198 map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
199 if (map->flags & MAP_ATTRIB)
200 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
202 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
207 static struct pccard_operations at91_cf_ops = {
208 .init = at91_cf_ss_init,
209 .suspend = at91_cf_ss_suspend,
210 .get_status = at91_cf_get_status,
211 .set_socket = at91_cf_set_socket,
212 .set_io_map = at91_cf_set_io_map,
213 .set_mem_map = at91_cf_set_mem_map,
216 /*--------------------------------------------------------------------------*/
218 static int __init at91_cf_probe(struct platform_device *pdev)
220 struct at91_cf_socket *cf;
221 struct at91_cf_data *board = pdev->dev.platform_data;
225 if (!board || !gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
228 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
232 cf = kzalloc(sizeof *cf, GFP_KERNEL);
238 cf->phys_baseaddr = io->start;
239 platform_set_drvdata(pdev, cf);
241 /* must be a GPIO; ergo must trigger on both edges */
242 status = gpio_request(board->det_pin, "cf_det");
245 status = request_irq(gpio_to_irq(board->det_pin), at91_cf_irq, 0, driver_name, cf);
248 device_init_wakeup(&pdev->dev, 1);
250 status = gpio_request(board->rst_pin, "cf_rst");
254 if (gpio_is_valid(board->vcc_pin)) {
255 status = gpio_request(board->vcc_pin, "cf_vcc");
261 * The card driver will request this irq later as needed.
262 * but it causes lots of "irqNN: nobody cared" messages
263 * unless we report that we handle everything (sigh).
264 * (Note: DK board doesn't wire the IRQ pin...)
266 if (gpio_is_valid(board->irq_pin)) {
267 status = gpio_request(board->irq_pin, "cf_irq");
270 status = request_irq(gpio_to_irq(board->irq_pin), at91_cf_irq,
271 IRQF_SHARED, driver_name, cf);
274 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
276 cf->socket.pci_irq = nr_irqs + 1;
278 /* pcmcia layer only remaps "real" memory not iospace */
279 cf->socket.io_offset = (unsigned long)
280 ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
281 if (!cf->socket.io_offset) {
286 /* reserve chip-select regions */
287 if (!request_mem_region(io->start, resource_size(io), driver_name)) {
292 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
293 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
295 cf->socket.owner = THIS_MODULE;
296 cf->socket.dev.parent = &pdev->dev;
297 cf->socket.ops = &at91_cf_ops;
298 cf->socket.resource_ops = &pccard_static_ops;
299 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
301 cf->socket.map_size = SZ_2K;
302 cf->socket.io[0].res = io;
304 status = pcmcia_register_socket(&cf->socket);
311 release_mem_region(io->start, resource_size(io));
313 if (cf->socket.io_offset)
314 iounmap((void __iomem *) cf->socket.io_offset);
315 if (gpio_is_valid(board->irq_pin)) {
316 free_irq(gpio_to_irq(board->irq_pin), cf);
318 gpio_free(board->irq_pin);
321 if (gpio_is_valid(board->vcc_pin))
322 gpio_free(board->vcc_pin);
324 gpio_free(board->rst_pin);
326 device_init_wakeup(&pdev->dev, 0);
327 free_irq(gpio_to_irq(board->det_pin), cf);
329 gpio_free(board->det_pin);
335 static int __exit at91_cf_remove(struct platform_device *pdev)
337 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
338 struct at91_cf_data *board = cf->board;
339 struct resource *io = cf->socket.io[0].res;
341 pcmcia_unregister_socket(&cf->socket);
342 release_mem_region(io->start, resource_size(io));
343 iounmap((void __iomem *) cf->socket.io_offset);
344 if (gpio_is_valid(board->irq_pin)) {
345 free_irq(gpio_to_irq(board->irq_pin), cf);
346 gpio_free(board->irq_pin);
348 if (gpio_is_valid(board->vcc_pin))
349 gpio_free(board->vcc_pin);
350 gpio_free(board->rst_pin);
351 device_init_wakeup(&pdev->dev, 0);
352 free_irq(gpio_to_irq(board->det_pin), cf);
353 gpio_free(board->det_pin);
360 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
362 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
363 struct at91_cf_data *board = cf->board;
365 if (device_may_wakeup(&pdev->dev)) {
366 enable_irq_wake(gpio_to_irq(board->det_pin));
367 if (gpio_is_valid(board->irq_pin))
368 enable_irq_wake(gpio_to_irq(board->irq_pin));
373 static int at91_cf_resume(struct platform_device *pdev)
375 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
376 struct at91_cf_data *board = cf->board;
378 if (device_may_wakeup(&pdev->dev)) {
379 disable_irq_wake(gpio_to_irq(board->det_pin));
380 if (gpio_is_valid(board->irq_pin))
381 disable_irq_wake(gpio_to_irq(board->irq_pin));
388 #define at91_cf_suspend NULL
389 #define at91_cf_resume NULL
392 static struct platform_driver at91_cf_driver = {
394 .name = (char *) driver_name,
395 .owner = THIS_MODULE,
397 .remove = __exit_p(at91_cf_remove),
398 .suspend = at91_cf_suspend,
399 .resume = at91_cf_resume,
402 /*--------------------------------------------------------------------------*/
404 static int __init at91_cf_init(void)
406 return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
408 module_init(at91_cf_init);
410 static void __exit at91_cf_exit(void)
412 platform_driver_unregister(&at91_cf_driver);
414 module_exit(at91_cf_exit);
416 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
417 MODULE_AUTHOR("David Brownell");
418 MODULE_LICENSE("GPL");
419 MODULE_ALIAS("platform:at91_cf");