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>
20 #include <pcmcia/ss.h>
22 #include <mach/hardware.h>
24 #include <asm/sizes.h>
27 #include <mach/board.h>
28 #include <mach/at91rm9200_mc.h>
32 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
33 * some other bit in {A24,A22..A11} is nREG to flag memory access
34 * (vs attributes). So more than 2KB/region would just be waste.
35 * Note: These are offsets from the physical base address.
37 #define CF_ATTR_PHYS (0)
38 #define CF_IO_PHYS (1 << 23)
39 #define CF_MEM_PHYS (0x017ff800)
41 /*--------------------------------------------------------------------------*/
43 static const char driver_name[] = "at91_cf";
45 struct at91_cf_socket {
46 struct pcmcia_socket socket;
50 struct platform_device *pdev;
51 struct at91_cf_data *board;
53 unsigned long phys_baseaddr;
56 static inline int at91_cf_present(struct at91_cf_socket *cf)
58 return !gpio_get_value(cf->board->det_pin);
61 /*--------------------------------------------------------------------------*/
63 static int at91_cf_ss_init(struct pcmcia_socket *s)
68 static irqreturn_t at91_cf_irq(int irq, void *_cf)
70 struct at91_cf_socket *cf = _cf;
72 if (irq == cf->board->det_pin) {
73 unsigned present = at91_cf_present(cf);
75 /* kick pccard as needed */
76 if (present != cf->present) {
77 cf->present = present;
78 pr_debug("%s: card %s\n", driver_name,
79 present ? "present" : "gone");
80 pcmcia_parse_events(&cf->socket, SS_DETECT);
87 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
89 struct at91_cf_socket *cf;
94 cf = container_of(s, struct at91_cf_socket, socket);
96 /* NOTE: CF is always 3VCARD */
97 if (at91_cf_present(cf)) {
98 int rdy = cf->board->irq_pin; /* RDY/nIRQ */
99 int vcc = cf->board->vcc_pin;
101 *sp = SS_DETECT | SS_3VCARD;
102 if (!rdy || gpio_get_value(rdy))
104 if (!vcc || gpio_get_value(vcc))
113 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
115 struct at91_cf_socket *cf;
117 cf = container_of(sock, struct at91_cf_socket, socket);
119 /* switch Vcc if needed and possible */
120 if (cf->board->vcc_pin) {
123 gpio_set_value(cf->board->vcc_pin, 0);
126 gpio_set_value(cf->board->vcc_pin, 1);
133 /* toggle reset if needed */
134 gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
136 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
137 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
142 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
144 return at91_cf_set_socket(s, &dead_socket);
147 /* we already mapped the I/O region */
148 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
150 struct at91_cf_socket *cf;
153 cf = container_of(s, struct at91_cf_socket, socket);
154 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
157 * Use 16 bit accesses unless/until we need 8-bit i/o space.
159 csr = at91_sys_read(AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
162 * NOTE: this CF controller ignores IOIS16, so we can't really do
163 * MAP_AUTOSZ. The 16bit mode allows single byte access on either
164 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
165 * purposes (and handles ide-cs).
167 * The 8bit mode is needed for odd byte access on D0-D7. It seems
168 * some cards only like that way to get at the odd byte, despite
169 * CF 3.0 spec table 35 also giving the D8-D15 option.
171 if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
172 csr |= AT91_SMC_DBW_8;
173 pr_debug("%s: 8bit i/o bus\n", driver_name);
175 csr |= AT91_SMC_DBW_16;
176 pr_debug("%s: 16bit i/o bus\n", driver_name);
178 at91_sys_write(AT91_SMC_CSR(cf->board->chipselect), csr);
180 io->start = cf->socket.io_offset;
181 io->stop = io->start + SZ_2K - 1;
186 /* pcmcia layer maps/unmaps mem regions */
188 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
190 struct at91_cf_socket *cf;
195 cf = container_of(s, struct at91_cf_socket, socket);
197 map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
198 if (map->flags & MAP_ATTRIB)
199 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
201 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
206 static struct pccard_operations at91_cf_ops = {
207 .init = at91_cf_ss_init,
208 .suspend = at91_cf_ss_suspend,
209 .get_status = at91_cf_get_status,
210 .set_socket = at91_cf_set_socket,
211 .set_io_map = at91_cf_set_io_map,
212 .set_mem_map = at91_cf_set_mem_map,
215 /*--------------------------------------------------------------------------*/
217 static int __init at91_cf_probe(struct platform_device *pdev)
219 struct at91_cf_socket *cf;
220 struct at91_cf_data *board = pdev->dev.platform_data;
224 if (!board || !board->det_pin || !board->rst_pin)
227 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231 cf = kzalloc(sizeof *cf, GFP_KERNEL);
237 cf->phys_baseaddr = io->start;
238 platform_set_drvdata(pdev, cf);
240 /* must be a GPIO; ergo must trigger on both edges */
241 status = gpio_request(board->det_pin, "cf_det");
244 status = request_irq(board->det_pin, at91_cf_irq, 0, driver_name, cf);
247 device_init_wakeup(&pdev->dev, 1);
249 status = gpio_request(board->rst_pin, "cf_rst");
253 if (board->vcc_pin) {
254 status = gpio_request(board->vcc_pin, "cf_vcc");
260 * The card driver will request this irq later as needed.
261 * but it causes lots of "irqNN: nobody cared" messages
262 * unless we report that we handle everything (sigh).
263 * (Note: DK board doesn't wire the IRQ pin...)
265 if (board->irq_pin) {
266 status = gpio_request(board->irq_pin, "cf_irq");
269 status = request_irq(board->irq_pin, at91_cf_irq,
270 IRQF_SHARED, driver_name, cf);
273 cf->socket.pci_irq = board->irq_pin;
275 cf->socket.pci_irq = nr_irqs + 1;
277 /* pcmcia layer only remaps "real" memory not iospace */
278 cf->socket.io_offset = (unsigned long)
279 ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
280 if (!cf->socket.io_offset) {
285 /* reserve chip-select regions */
286 if (!request_mem_region(io->start, io->end + 1 - io->start,
292 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
293 board->det_pin, 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, io->end + 1 - io->start);
313 if (cf->socket.io_offset)
314 iounmap((void __iomem *) cf->socket.io_offset);
315 if (board->irq_pin) {
316 free_irq(board->irq_pin, cf);
318 gpio_free(board->irq_pin);
322 gpio_free(board->vcc_pin);
324 gpio_free(board->rst_pin);
326 device_init_wakeup(&pdev->dev, 0);
327 free_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, io->end + 1 - io->start);
343 iounmap((void __iomem *) cf->socket.io_offset);
344 if (board->irq_pin) {
345 free_irq(board->irq_pin, cf);
346 gpio_free(board->irq_pin);
349 gpio_free(board->vcc_pin);
350 gpio_free(board->rst_pin);
351 device_init_wakeup(&pdev->dev, 0);
352 free_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(board->det_pin);
368 enable_irq_wake(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(board->det_pin);
381 disable_irq_wake(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");