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 <linux/sizes.h>
24 #include <linux/of_device.h>
25 #include <linux/of_gpio.h>
27 #include <pcmcia/ss.h>
29 #include <mach/at91rm9200_mc.h>
30 #include <mach/at91_ramc.h>
34 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
35 * some other bit in {A24,A22..A11} is nREG to flag memory access
36 * (vs attributes). So more than 2KB/region would just be waste.
37 * Note: These are offsets from the physical base address.
39 #define CF_ATTR_PHYS (0)
40 #define CF_IO_PHYS (1 << 23)
41 #define CF_MEM_PHYS (0x017ff800)
43 /*--------------------------------------------------------------------------*/
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 == gpio_to_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 dev_dbg(&cf->pdev->dev, "card %s\n",
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 = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
99 int vcc = gpio_is_valid(cf->board->vcc_pin);
101 *sp = SS_DETECT | SS_3VCARD;
102 if (!rdy || gpio_get_value(cf->board->irq_pin))
104 if (!vcc || gpio_get_value(cf->board->vcc_pin))
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 (gpio_is_valid(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 dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
137 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_ramc_read(0, 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 dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
175 csr |= AT91_SMC_DBW_16;
176 dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
178 at91_ramc_write(0, 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 #if defined(CONFIG_OF)
218 static const struct of_device_id at91_cf_dt_ids[] = {
219 { .compatible = "atmel,at91rm9200-cf" },
222 MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);
224 static int at91_cf_dt_init(struct platform_device *pdev)
226 struct at91_cf_data *board;
228 board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
232 board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
233 board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
234 board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
235 board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);
237 pdev->dev.platform_data = board;
242 static int at91_cf_dt_init(struct platform_device *pdev)
248 static int at91_cf_probe(struct platform_device *pdev)
250 struct at91_cf_socket *cf;
251 struct at91_cf_data *board = pdev->dev.platform_data;
256 status = at91_cf_dt_init(pdev);
260 board = pdev->dev.platform_data;
263 if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
266 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
270 cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
276 cf->phys_baseaddr = io->start;
277 platform_set_drvdata(pdev, cf);
279 /* must be a GPIO; ergo must trigger on both edges */
280 status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
284 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
285 at91_cf_irq, 0, "at91_cf detect", cf);
289 device_init_wakeup(&pdev->dev, 1);
291 status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
295 if (gpio_is_valid(board->vcc_pin)) {
296 status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
302 * The card driver will request this irq later as needed.
303 * but it causes lots of "irqNN: nobody cared" messages
304 * unless we report that we handle everything (sigh).
305 * (Note: DK board doesn't wire the IRQ pin...)
307 if (gpio_is_valid(board->irq_pin)) {
308 status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
312 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
313 at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
316 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
318 cf->socket.pci_irq = nr_irqs + 1;
321 * pcmcia layer only remaps "real" memory not iospace
322 * io_offset is set to 0x10000 to avoid the check in static_find_io().
324 cf->socket.io_offset = 0x10000;
325 status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS);
329 /* reserve chip-select regions */
330 if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
335 dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
336 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
338 cf->socket.owner = THIS_MODULE;
339 cf->socket.dev.parent = &pdev->dev;
340 cf->socket.ops = &at91_cf_ops;
341 cf->socket.resource_ops = &pccard_static_ops;
342 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
344 cf->socket.map_size = SZ_2K;
345 cf->socket.io[0].res = io;
347 status = pcmcia_register_socket(&cf->socket);
354 device_init_wakeup(&pdev->dev, 0);
358 static int at91_cf_remove(struct platform_device *pdev)
360 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
362 pcmcia_unregister_socket(&cf->socket);
363 device_init_wakeup(&pdev->dev, 0);
370 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
372 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
373 struct at91_cf_data *board = cf->board;
375 if (device_may_wakeup(&pdev->dev)) {
376 enable_irq_wake(gpio_to_irq(board->det_pin));
377 if (gpio_is_valid(board->irq_pin))
378 enable_irq_wake(gpio_to_irq(board->irq_pin));
383 static int at91_cf_resume(struct platform_device *pdev)
385 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
386 struct at91_cf_data *board = cf->board;
388 if (device_may_wakeup(&pdev->dev)) {
389 disable_irq_wake(gpio_to_irq(board->det_pin));
390 if (gpio_is_valid(board->irq_pin))
391 disable_irq_wake(gpio_to_irq(board->irq_pin));
398 #define at91_cf_suspend NULL
399 #define at91_cf_resume NULL
402 static struct platform_driver at91_cf_driver = {
405 .of_match_table = of_match_ptr(at91_cf_dt_ids),
407 .probe = at91_cf_probe,
408 .remove = at91_cf_remove,
409 .suspend = at91_cf_suspend,
410 .resume = at91_cf_resume,
413 module_platform_driver(at91_cf_driver);
415 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
416 MODULE_AUTHOR("David Brownell");
417 MODULE_LICENSE("GPL");
418 MODULE_ALIAS("platform:at91_cf");