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/sched.h>
15 #include <linux/platform_device.h>
16 #include <linux/errno.h>
17 #include <linux/init.h>
18 #include <linux/interrupt.h>
20 #include <pcmcia/ss.h>
22 #include <asm/hardware.h>
24 #include <asm/sizes.h>
26 #include <asm/arch/at91rm9200.h>
27 #include <asm/arch/board.h>
28 #include <asm/arch/gpio.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 #define SZ_2K (2 * SZ_1K)
58 static inline int at91_cf_present(struct at91_cf_socket *cf)
60 return !at91_get_gpio_value(cf->board->det_pin);
63 /*--------------------------------------------------------------------------*/
65 static int at91_cf_ss_init(struct pcmcia_socket *s)
70 static irqreturn_t at91_cf_irq(int irq, void *_cf)
72 struct at91_cf_socket *cf = _cf;
74 if (irq == cf->board->det_pin) {
75 unsigned present = at91_cf_present(cf);
77 /* kick pccard as needed */
78 if (present != cf->present) {
79 cf->present = present;
80 pr_debug("%s: card %s\n", driver_name,
81 present ? "present" : "gone");
82 pcmcia_parse_events(&cf->socket, SS_DETECT);
89 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
91 struct at91_cf_socket *cf;
96 cf = container_of(s, struct at91_cf_socket, socket);
98 /* NOTE: CF is always 3VCARD */
99 if (at91_cf_present(cf)) {
100 int rdy = cf->board->irq_pin; /* RDY/nIRQ */
101 int vcc = cf->board->vcc_pin;
103 *sp = SS_DETECT | SS_3VCARD;
104 if (!rdy || at91_get_gpio_value(rdy))
106 if (!vcc || at91_get_gpio_value(vcc))
115 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
117 struct at91_cf_socket *cf;
119 cf = container_of(sock, struct at91_cf_socket, socket);
121 /* switch Vcc if needed and possible */
122 if (cf->board->vcc_pin) {
125 at91_set_gpio_value(cf->board->vcc_pin, 0);
128 at91_set_gpio_value(cf->board->vcc_pin, 1);
135 /* toggle reset if needed */
136 at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET);
138 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
139 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
144 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
146 return at91_cf_set_socket(s, &dead_socket);
149 /* we already mapped the I/O region */
150 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
152 struct at91_cf_socket *cf;
155 cf = container_of(s, struct at91_cf_socket, socket);
156 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
159 * Use 16 bit accesses unless/until we need 8-bit i/o space.
160 * Always set CSR4 ... PCMCIA won't always unmap things.
162 csr = at91_sys_read(AT91_SMC_CSR(4)) & ~AT91_SMC_DBW;
165 * NOTE: this CF controller ignores IOIS16, so we can't really do
166 * MAP_AUTOSZ. The 16bit mode allows single byte access on either
167 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
168 * purposes (and handles ide-cs).
170 * The 8bit mode is needed for odd byte access on D0-D7. It seems
171 * some cards only like that way to get at the odd byte, despite
172 * CF 3.0 spec table 35 also giving the D8-D15 option.
174 if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
175 csr |= AT91_SMC_DBW_8;
176 pr_debug("%s: 8bit i/o bus\n", driver_name);
178 csr |= AT91_SMC_DBW_16;
179 pr_debug("%s: 16bit i/o bus\n", driver_name);
181 at91_sys_write(AT91_SMC_CSR(4), csr);
183 io->start = cf->socket.io_offset;
184 io->stop = io->start + SZ_2K - 1;
189 /* pcmcia layer maps/unmaps mem regions */
191 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
193 struct at91_cf_socket *cf;
198 cf = container_of(s, struct at91_cf_socket, socket);
200 map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
201 if (map->flags & MAP_ATTRIB)
202 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
204 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
209 static struct pccard_operations at91_cf_ops = {
210 .init = at91_cf_ss_init,
211 .suspend = at91_cf_ss_suspend,
212 .get_status = at91_cf_get_status,
213 .set_socket = at91_cf_set_socket,
214 .set_io_map = at91_cf_set_io_map,
215 .set_mem_map = at91_cf_set_mem_map,
218 /*--------------------------------------------------------------------------*/
220 static int __init at91_cf_probe(struct platform_device *pdev)
222 struct at91_cf_socket *cf;
223 struct at91_cf_data *board = pdev->dev.platform_data;
228 if (!board || !board->det_pin || !board->rst_pin)
231 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
235 cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
241 cf->phys_baseaddr = io->start;
242 platform_set_drvdata(pdev, cf);
244 /* CF takes over CS4, CS5, CS6 */
245 csa = at91_sys_read(AT91_EBI_CSA);
246 at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
248 /* nWAIT is _not_ a default setting */
249 (void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */
252 * Static memory controller timing adjustments.
253 * REVISIT: these timings are in terms of MCK cycles, so
254 * when MCK changes (cpufreq etc) so must these values...
256 at91_sys_write(AT91_SMC_CSR(4),
261 | AT91_SMC_NWS_(32) /* wait states */
262 | AT91_SMC_RWSETUP_(6) /* setup time */
263 | AT91_SMC_RWHOLD_(4) /* hold time */
266 /* must be a GPIO; ergo must trigger on both edges */
267 status = request_irq(board->det_pin, at91_cf_irq, 0, driver_name, cf);
270 device_init_wakeup(&pdev->dev, 1);
273 * The card driver will request this irq later as needed.
274 * but it causes lots of "irqNN: nobody cared" messages
275 * unless we report that we handle everything (sigh).
276 * (Note: DK board doesn't wire the IRQ pin...)
278 if (board->irq_pin) {
279 status = request_irq(board->irq_pin, at91_cf_irq,
280 IRQF_SHARED, driver_name, cf);
283 cf->socket.pci_irq = board->irq_pin;
285 cf->socket.pci_irq = NR_IRQS + 1;
287 /* pcmcia layer only remaps "real" memory not iospace */
288 cf->socket.io_offset = (unsigned long) ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
289 if (!cf->socket.io_offset) {
294 /* reserve CS4, CS5, and CS6 regions; but use just CS4 */
295 if (!request_mem_region(io->start, io->end + 1 - io->start,
301 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
302 board->det_pin, board->irq_pin);
304 cf->socket.owner = THIS_MODULE;
305 cf->socket.dev.dev = &pdev->dev;
306 cf->socket.ops = &at91_cf_ops;
307 cf->socket.resource_ops = &pccard_static_ops;
308 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
310 cf->socket.map_size = SZ_2K;
311 cf->socket.io[0].res = io;
313 status = pcmcia_register_socket(&cf->socket);
320 release_mem_region(io->start, io->end + 1 - io->start);
322 if (cf->socket.io_offset)
323 iounmap((void __iomem *) cf->socket.io_offset);
325 free_irq(board->irq_pin, cf);
327 device_init_wakeup(&pdev->dev, 0);
328 free_irq(board->det_pin, cf);
330 at91_sys_write(AT91_EBI_CSA, csa);
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;
342 pcmcia_unregister_socket(&cf->socket);
344 free_irq(board->irq_pin, cf);
345 device_init_wakeup(&pdev->dev, 0);
346 free_irq(board->det_pin, cf);
347 iounmap((void __iomem *) cf->socket.io_offset);
348 release_mem_region(io->start, io->end + 1 - io->start);
350 csa = at91_sys_read(AT91_EBI_CSA);
351 at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
359 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
361 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
362 struct at91_cf_data *board = cf->board;
364 pcmcia_socket_dev_suspend(&pdev->dev, mesg);
365 if (device_may_wakeup(&pdev->dev)) {
366 enable_irq_wake(board->det_pin);
368 enable_irq_wake(board->irq_pin);
370 disable_irq_wake(board->det_pin);
372 disable_irq_wake(board->irq_pin);
377 static int at91_cf_resume(struct platform_device *pdev)
379 pcmcia_socket_dev_resume(&pdev->dev);
384 #define at91_cf_suspend NULL
385 #define at91_cf_resume NULL
388 static struct platform_driver at91_cf_driver = {
390 .name = (char *) driver_name,
391 .owner = THIS_MODULE,
393 .probe = at91_cf_probe,
394 .remove = __exit_p(at91_cf_remove),
395 .suspend = at91_cf_suspend,
396 .resume = at91_cf_resume,
399 /*--------------------------------------------------------------------------*/
401 static int __init at91_cf_init(void)
403 return platform_driver_register(&at91_cf_driver);
405 module_init(at91_cf_init);
407 static void __exit at91_cf_exit(void)
409 platform_driver_unregister(&at91_cf_driver);
411 module_exit(at91_cf_exit);
413 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
414 MODULE_AUTHOR("David Brownell");
415 MODULE_LICENSE("GPL");