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.
36 #define CF_ATTR_PHYS (AT91_CF_BASE)
37 #define CF_IO_PHYS (AT91_CF_BASE + (1 << 23))
38 #define CF_MEM_PHYS (AT91_CF_BASE + 0x017ff800)
40 /*--------------------------------------------------------------------------*/
42 static const char driver_name[] = "at91_cf";
44 struct at91_cf_socket {
45 struct pcmcia_socket socket;
49 struct platform_device *pdev;
50 struct at91_cf_data *board;
53 #define SZ_2K (2 * SZ_1K)
55 static inline int at91_cf_present(struct at91_cf_socket *cf)
57 return !at91_get_gpio_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, struct pt_regs *r)
69 struct at91_cf_socket *cf = (struct at91_cf_socket *) _cf;
71 if (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 pr_debug("%s: card %s\n", driver_name,
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 = cf->board->irq_pin; /* RDY/nIRQ */
98 int vcc = cf->board->vcc_pin;
100 *sp = SS_DETECT | SS_3VCARD;
101 if (!rdy || at91_get_gpio_value(rdy))
103 if (!vcc || at91_get_gpio_value(vcc))
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 (cf->board->vcc_pin) {
122 at91_set_gpio_value(cf->board->vcc_pin, 0);
125 at91_set_gpio_value(cf->board->vcc_pin, 1);
132 /* toggle reset if needed */
133 at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET);
135 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
136 driver_name, 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.
157 * Always set CSR4 ... PCMCIA won't always unmap things.
159 csr = at91_sys_read(AT91_SMC_CSR(4)) & ~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(4), 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_ATTR_PHYS;
201 map->static_start = 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 device *dev)
219 struct at91_cf_socket *cf;
220 struct at91_cf_data *board = dev->platform_data;
221 struct platform_device *pdev = to_platform_device(dev);
226 if (!board || !board->det_pin || !board->rst_pin)
229 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
233 cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
239 dev_set_drvdata(dev, cf);
241 /* CF takes over CS4, CS5, CS6 */
242 csa = at91_sys_read(AT91_EBI_CSA);
243 at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
245 /* force poweron defaults for these pins ... */
246 (void) at91_set_A_periph(AT91_PIN_PC9, 0); /* A25/CFRNW */
247 (void) at91_set_A_periph(AT91_PIN_PC10, 0); /* NCS4/CFCS */
248 (void) at91_set_A_periph(AT91_PIN_PC11, 0); /* NCS5/CFCE1 */
249 (void) at91_set_A_periph(AT91_PIN_PC12, 0); /* NCS6/CFCE2 */
251 /* nWAIT is _not_ a default setting */
252 (void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */
255 * Static memory controller timing adjustments.
256 * REVISIT: these timings are in terms of MCK cycles, so
257 * when MCK changes (cpufreq etc) so must these values...
259 at91_sys_write(AT91_SMC_CSR(4),
264 | AT91_SMC_NWS_(32) /* wait states */
265 | AT91_SMC_RWSETUP_(6) /* setup time */
266 | AT91_SMC_RWHOLD_(4) /* hold time */
269 /* must be a GPIO; ergo must trigger on both edges */
270 status = request_irq(board->det_pin, at91_cf_irq,
271 SA_SAMPLE_RANDOM, driver_name, cf);
276 * The card driver will request this irq later as needed.
277 * but it causes lots of "irqNN: nobody cared" messages
278 * unless we report that we handle everything (sigh).
279 * (Note: DK board doesn't wire the IRQ pin...)
281 if (board->irq_pin) {
282 status = request_irq(board->irq_pin, at91_cf_irq,
283 SA_SHIRQ, driver_name, cf);
286 cf->socket.pci_irq = board->irq_pin;
288 cf->socket.pci_irq = NR_IRQS + 1;
290 /* pcmcia layer only remaps "real" memory not iospace */
291 cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K);
292 if (!cf->socket.io_offset)
295 /* reserve CS4, CS5, and CS6 regions; but use just CS4 */
296 if (!request_mem_region(io->start, io->end + 1 - io->start,
300 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
301 board->det_pin, board->irq_pin);
303 cf->socket.owner = THIS_MODULE;
304 cf->socket.dev.dev = dev;
305 cf->socket.ops = &at91_cf_ops;
306 cf->socket.resource_ops = &pccard_static_ops;
307 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
309 cf->socket.map_size = SZ_2K;
310 cf->socket.io[0].res = io;
312 status = pcmcia_register_socket(&cf->socket);
319 iounmap((void __iomem *) cf->socket.io_offset);
320 release_mem_region(io->start, io->end + 1 - io->start);
323 free_irq(board->irq_pin, cf);
325 free_irq(board->det_pin, cf);
327 at91_sys_write(AT91_EBI_CSA, csa);
332 static int __exit at91_cf_remove(struct device *dev)
334 struct at91_cf_socket *cf = dev_get_drvdata(dev);
335 struct resource *io = cf->socket.io[0].res;
338 pcmcia_unregister_socket(&cf->socket);
339 free_irq(cf->board->irq_pin, cf);
340 free_irq(cf->board->det_pin, cf);
341 iounmap((void __iomem *) cf->socket.io_offset);
342 release_mem_region(io->start, io->end + 1 - io->start);
344 csa = at91_sys_read(AT91_EBI_CSA);
345 at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
351 static struct device_driver at91_cf_driver = {
352 .name = (char *) driver_name,
353 .bus = &platform_bus_type,
354 .probe = at91_cf_probe,
355 .remove = __exit_p(at91_cf_remove),
356 .suspend = pcmcia_socket_dev_suspend,
357 .resume = pcmcia_socket_dev_resume,
360 /*--------------------------------------------------------------------------*/
362 static int __init at91_cf_init(void)
364 return driver_register(&at91_cf_driver);
366 module_init(at91_cf_init);
368 static void __exit at91_cf_exit(void)
370 driver_unregister(&at91_cf_driver);
372 module_exit(at91_cf_exit);
374 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
375 MODULE_AUTHOR("David Brownell");
376 MODULE_LICENSE("GPL");