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 struct at91_cf_socket {
45 struct pcmcia_socket socket;
49 struct platform_device *pdev;
50 struct at91_cf_data *board;
52 unsigned long phys_baseaddr;
55 static inline int at91_cf_present(struct at91_cf_socket *cf)
57 return !gpio_get_value(cf->board->det_pin);
60 /*--------------------------------------------------------------------------*/
62 static int at91_cf_ss_init(struct pcmcia_socket *s)
67 static irqreturn_t at91_cf_irq(int irq, void *_cf)
69 struct at91_cf_socket *cf = _cf;
71 if (irq == gpio_to_irq(cf->board->det_pin)) {
72 unsigned present = at91_cf_present(cf);
74 /* kick pccard as needed */
75 if (present != cf->present) {
76 cf->present = present;
77 dev_dbg(&cf->pdev->dev, "card %s\n",
78 present ? "present" : "gone");
79 pcmcia_parse_events(&cf->socket, SS_DETECT);
86 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
88 struct at91_cf_socket *cf;
93 cf = container_of(s, struct at91_cf_socket, socket);
95 /* NOTE: CF is always 3VCARD */
96 if (at91_cf_present(cf)) {
97 int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
98 int vcc = gpio_is_valid(cf->board->vcc_pin);
100 *sp = SS_DETECT | SS_3VCARD;
101 if (!rdy || gpio_get_value(cf->board->irq_pin))
103 if (!vcc || gpio_get_value(cf->board->vcc_pin))
112 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
114 struct at91_cf_socket *cf;
116 cf = container_of(sock, struct at91_cf_socket, socket);
118 /* switch Vcc if needed and possible */
119 if (gpio_is_valid(cf->board->vcc_pin)) {
122 gpio_set_value(cf->board->vcc_pin, 0);
125 gpio_set_value(cf->board->vcc_pin, 1);
132 /* toggle reset if needed */
133 gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
135 dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
136 s->Vcc, s->io_irq, s->flags, s->csc_mask);
141 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
143 return at91_cf_set_socket(s, &dead_socket);
146 /* we already mapped the I/O region */
147 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
149 struct at91_cf_socket *cf;
152 cf = container_of(s, struct at91_cf_socket, socket);
153 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
156 * Use 16 bit accesses unless/until we need 8-bit i/o space.
158 csr = at91_ramc_read(0, AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
161 * NOTE: this CF controller ignores IOIS16, so we can't really do
162 * MAP_AUTOSZ. The 16bit mode allows single byte access on either
163 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
164 * purposes (and handles ide-cs).
166 * The 8bit mode is needed for odd byte access on D0-D7. It seems
167 * some cards only like that way to get at the odd byte, despite
168 * CF 3.0 spec table 35 also giving the D8-D15 option.
170 if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
171 csr |= AT91_SMC_DBW_8;
172 dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
174 csr |= AT91_SMC_DBW_16;
175 dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
177 at91_ramc_write(0, AT91_SMC_CSR(cf->board->chipselect), csr);
179 io->start = cf->socket.io_offset;
180 io->stop = io->start + SZ_2K - 1;
185 /* pcmcia layer maps/unmaps mem regions */
187 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
189 struct at91_cf_socket *cf;
194 cf = container_of(s, struct at91_cf_socket, socket);
196 map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
197 if (map->flags & MAP_ATTRIB)
198 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
200 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
205 static struct pccard_operations at91_cf_ops = {
206 .init = at91_cf_ss_init,
207 .suspend = at91_cf_ss_suspend,
208 .get_status = at91_cf_get_status,
209 .set_socket = at91_cf_set_socket,
210 .set_io_map = at91_cf_set_io_map,
211 .set_mem_map = at91_cf_set_mem_map,
214 /*--------------------------------------------------------------------------*/
216 static int __init at91_cf_probe(struct platform_device *pdev)
218 struct at91_cf_socket *cf;
219 struct at91_cf_data *board = pdev->dev.platform_data;
223 if (!board || !gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
226 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
230 cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
236 cf->phys_baseaddr = io->start;
237 platform_set_drvdata(pdev, cf);
239 /* must be a GPIO; ergo must trigger on both edges */
240 status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
244 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
245 at91_cf_irq, 0, "at91_cf detect", cf);
249 device_init_wakeup(&pdev->dev, 1);
251 status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
255 if (gpio_is_valid(board->vcc_pin)) {
256 status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
262 * The card driver will request this irq later as needed.
263 * but it causes lots of "irqNN: nobody cared" messages
264 * unless we report that we handle everything (sigh).
265 * (Note: DK board doesn't wire the IRQ pin...)
267 if (gpio_is_valid(board->irq_pin)) {
268 status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
272 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
273 at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
276 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
278 cf->socket.pci_irq = nr_irqs + 1;
280 /* pcmcia layer only remaps "real" memory not iospace */
281 cf->socket.io_offset = (unsigned long) devm_ioremap(&pdev->dev,
282 cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
283 if (!cf->socket.io_offset) {
288 /* reserve chip-select regions */
289 if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
294 dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
295 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
297 cf->socket.owner = THIS_MODULE;
298 cf->socket.dev.parent = &pdev->dev;
299 cf->socket.ops = &at91_cf_ops;
300 cf->socket.resource_ops = &pccard_static_ops;
301 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
303 cf->socket.map_size = SZ_2K;
304 cf->socket.io[0].res = io;
306 status = pcmcia_register_socket(&cf->socket);
313 device_init_wakeup(&pdev->dev, 0);
317 static int __exit at91_cf_remove(struct platform_device *pdev)
319 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
321 pcmcia_unregister_socket(&cf->socket);
322 device_init_wakeup(&pdev->dev, 0);
329 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
331 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
332 struct at91_cf_data *board = cf->board;
334 if (device_may_wakeup(&pdev->dev)) {
335 enable_irq_wake(gpio_to_irq(board->det_pin));
336 if (gpio_is_valid(board->irq_pin))
337 enable_irq_wake(gpio_to_irq(board->irq_pin));
342 static int at91_cf_resume(struct platform_device *pdev)
344 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
345 struct at91_cf_data *board = cf->board;
347 if (device_may_wakeup(&pdev->dev)) {
348 disable_irq_wake(gpio_to_irq(board->det_pin));
349 if (gpio_is_valid(board->irq_pin))
350 disable_irq_wake(gpio_to_irq(board->irq_pin));
357 #define at91_cf_suspend NULL
358 #define at91_cf_resume NULL
361 static struct platform_driver at91_cf_driver = {
364 .owner = THIS_MODULE,
366 .remove = __exit_p(at91_cf_remove),
367 .suspend = at91_cf_suspend,
368 .resume = at91_cf_resume,
371 /*--------------------------------------------------------------------------*/
373 static int __init at91_cf_init(void)
375 return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
377 module_init(at91_cf_init);
379 static void __exit at91_cf_exit(void)
381 platform_driver_unregister(&at91_cf_driver);
383 module_exit(at91_cf_exit);
385 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
386 MODULE_AUTHOR("David Brownell");
387 MODULE_LICENSE("GPL");
388 MODULE_ALIAS("platform:at91_cf");