blob: 67cc5f7d0c90634c42726f9157f4c1460dfb4d71 [file] [log] [blame]
Andrew Victor2c1f3b72006-02-21 12:56:52 +02001/*
2 * at91_cf.c -- AT91 CompactFlash controller driver
3 *
4 * Copyright (C) 2005 David Brownell
5 *
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.
10 */
11
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>
19
20#include <pcmcia/ss.h>
21
22#include <asm/hardware.h>
23#include <asm/io.h>
24#include <asm/sizes.h>
25
26#include <asm/arch/at91rm9200.h>
27#include <asm/arch/board.h>
28#include <asm/arch/gpio.h>
29
30
31#define CF_SIZE 0x30000000 /* CS5+CS6: unavailable */
32
33/*
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 */
38#define CF_ATTR_PHYS (AT91_CF_BASE)
39#define CF_IO_PHYS (AT91_CF_BASE + (1 << 23))
40#define CF_MEM_PHYS (AT91_CF_BASE + 0x017ff800)
41
42/*--------------------------------------------------------------------------*/
43
44static const char driver_name[] = "at91_cf";
45
46struct at91_cf_socket {
47 struct pcmcia_socket socket;
48
49 unsigned present:1;
50
51 struct platform_device *pdev;
52 struct at91_cf_data *board;
53};
54
55#define SZ_2K (2 * SZ_1K)
56
57static inline int at91_cf_present(struct at91_cf_socket *cf)
58{
59 return !at91_get_gpio_value(cf->board->det_pin);
60}
61
62/*--------------------------------------------------------------------------*/
63
64static int at91_cf_ss_init(struct pcmcia_socket *s)
65{
66 return 0;
67}
68
69static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r)
70{
71 struct at91_cf_socket *cf = (struct at91_cf_socket *) _cf;
72
73 if (irq == cf->board->det_pin) {
74 unsigned present = at91_cf_present(cf);
75
76 /* kick pccard as needed */
77 if (present != cf->present) {
78 cf->present = present;
79 pr_debug("%s: card %s\n", driver_name, present ? "present" : "gone");
80 pcmcia_parse_events(&cf->socket, SS_DETECT);
81 }
82 }
83
84 return IRQ_HANDLED;
85}
86
87static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
88{
89 struct at91_cf_socket *cf;
90
91 if (!sp)
92 return -EINVAL;
93
94 cf = container_of(s, struct at91_cf_socket, socket);
95
96 /* NOTE: we assume 3VCARD, not XVCARD... */
97 if (at91_cf_present(cf)) {
98 int rdy = cf->board->irq_pin; /* RDY/nIRQ */
99 int vcc = cf->board->vcc_pin;
100
101 *sp = SS_DETECT | SS_3VCARD;
102 if (!rdy || at91_get_gpio_value(rdy))
103 *sp |= SS_READY;
104 if (!vcc || at91_get_gpio_value(vcc))
105 *sp |= SS_POWERON;
106 } else
107 *sp = 0;
108
109 return 0;
110}
111
112static int at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
113{
114 struct at91_cf_socket *cf;
115
116 cf = container_of(sock, struct at91_cf_socket, socket);
117
118 /* switch Vcc if needed and possible */
119 if (cf->board->vcc_pin) {
120 switch (s->Vcc) {
121 case 0:
122 at91_set_gpio_value(cf->board->vcc_pin, 0);
123 break;
124 case 33:
125 at91_set_gpio_value(cf->board->vcc_pin, 1);
126 break;
127 default:
128 return -EINVAL;
129 }
130 }
131
132 /* toggle reset if needed */
133 at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET);
134
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);
137
138 return 0;
139}
140
141static int at91_cf_ss_suspend(struct pcmcia_socket *s)
142{
143 return at91_cf_set_socket(s, &dead_socket);
144}
145
146/* we already mapped the I/O region */
147static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
148{
149 struct at91_cf_socket *cf;
150 u32 csr;
151
152 cf = container_of(s, struct at91_cf_socket, socket);
153 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
154
155 /*
156 * Use 16 bit accesses unless/until we need 8-bit i/o space.
157 * Always set CSR4 ... PCMCIA won't always unmap things.
158 */
159 csr = at91_sys_read(AT91_SMC_CSR(4)) & ~AT91_SMC_DBW;
160
161 /*
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).
166 *
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.
170 */
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);
174 } else {
175 csr |= AT91_SMC_DBW_16;
176 pr_debug("%s: 16bit i/o bus\n", driver_name);
177 }
178 at91_sys_write(AT91_SMC_CSR(4), csr);
179
180 io->start = cf->socket.io_offset;
181 io->stop = io->start + SZ_2K - 1;
182
183 return 0;
184}
185
186/* pcmcia layer maps/unmaps mem regions */
187static int at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
188{
189 struct at91_cf_socket *cf;
190
191 if (map->card_start)
192 return -EINVAL;
193
194 cf = container_of(s, struct at91_cf_socket, socket);
195
196 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
197 if (map->flags & MAP_ATTRIB)
198 map->static_start = CF_ATTR_PHYS;
199 else
200 map->static_start = CF_MEM_PHYS;
201
202 return 0;
203}
204
205static 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,
212};
213
214/*--------------------------------------------------------------------------*/
215
216static int __init at91_cf_probe(struct device *dev)
217{
218 struct at91_cf_socket *cf;
219 struct at91_cf_data *board = dev->platform_data;
220 struct platform_device *pdev = to_platform_device(dev);
221 unsigned int csa;
222 int status;
223
224 if (!board || !board->det_pin || !board->rst_pin)
225 return -ENODEV;
226
227 cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
228 if (!cf)
229 return -ENOMEM;
230
231 cf->board = board;
232 cf->pdev = pdev;
233 dev_set_drvdata(dev, cf);
234
235 /* CF takes over CS4, CS5, CS6 */
236 csa = at91_sys_read(AT91_EBI_CSA);
237 at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
238
239 /* force poweron defaults for these pins ... */
240 (void) at91_set_A_periph(AT91_PIN_PC9, 0); /* A25/CFRNW */
241 (void) at91_set_A_periph(AT91_PIN_PC10, 0); /* NCS4/CFCS */
242 (void) at91_set_A_periph(AT91_PIN_PC11, 0); /* NCS5/CFCE1 */
243 (void) at91_set_A_periph(AT91_PIN_PC12, 0); /* NCS6/CFCE2 */
244
245 /* nWAIT is _not_ a default setting */
246 (void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */
247
248 /*
249 * Static memory controller timing adjustments.
250 * REVISIT: these timings are in terms of MCK cycles, so
251 * when MCK changes (cpufreq etc) so must these values...
252 */
253 at91_sys_write(AT91_SMC_CSR(4), AT91_SMC_ACSS_STD | AT91_SMC_DBW_16 | AT91_SMC_BAT | AT91_SMC_WSEN
254 | AT91_SMC_NWS_(32) /* wait states */
255 | AT91_SMC_RWSETUP_(6) /* setup time */
256 | AT91_SMC_RWHOLD_(4) /* hold time */
257 );
258
259 /* must be a GPIO; ergo must trigger on both edges */
260 status = request_irq(board->det_pin, at91_cf_irq,
261 SA_SAMPLE_RANDOM, driver_name, cf);
262 if (status < 0)
263 goto fail0;
264
265 /*
266 * The card driver will request this irq later as needed.
267 * but it causes lots of "irqNN: nobody cared" messages
268 * unless we report that we handle everything (sigh).
269 * (Note: DK board doesn't wire the IRQ pin...)
270 */
271 if (board->irq_pin) {
272 status = request_irq(board->irq_pin, at91_cf_irq,
273 SA_SHIRQ, driver_name, cf);
274 if (status < 0)
275 goto fail0a;
276 cf->socket.pci_irq = board->irq_pin;
277 }
278 else
279 cf->socket.pci_irq = NR_IRQS + 1;
280
281 /* pcmcia layer only remaps "real" memory not iospace */
282 cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K);
283 if (!cf->socket.io_offset)
284 goto fail1;
285
286 /* reserve CS4, CS5, and CS6 regions; but use just CS4 */
287 if (!request_mem_region(AT91_CF_BASE, CF_SIZE, driver_name))
288 goto fail1;
289
290 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
291 board->det_pin, board->irq_pin);
292
293 cf->socket.owner = THIS_MODULE;
294 cf->socket.dev.dev = dev;
295 cf->socket.ops = &at91_cf_ops;
296 cf->socket.resource_ops = &pccard_static_ops;
297 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
298 | SS_CAP_MEM_ALIGN;
299 cf->socket.map_size = SZ_2K;
300 cf->socket.io[0].NumPorts = SZ_2K;
301
302 status = pcmcia_register_socket(&cf->socket);
303 if (status < 0)
304 goto fail2;
305
306 return 0;
307
308fail2:
309 iounmap((void __iomem *) cf->socket.io_offset);
310 release_mem_region(AT91_CF_BASE, CF_SIZE);
311fail1:
312 if (board->irq_pin)
313 free_irq(board->irq_pin, cf);
314fail0a:
315 free_irq(board->det_pin, cf);
316fail0:
317 at91_sys_write(AT91_EBI_CSA, csa);
318 kfree(cf);
319 return status;
320}
321
322static int __exit at91_cf_remove(struct device *dev)
323{
324 struct at91_cf_socket *cf = dev_get_drvdata(dev);
325 unsigned int csa;
326
327 pcmcia_unregister_socket(&cf->socket);
328 free_irq(cf->board->irq_pin, cf);
329 free_irq(cf->board->det_pin, cf);
330 iounmap((void __iomem *) cf->socket.io_offset);
331 release_mem_region(AT91_CF_BASE, CF_SIZE);
332
333 csa = at91_sys_read(AT91_EBI_CSA);
334 at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
335
336 kfree(cf);
337 return 0;
338}
339
340static struct device_driver at91_cf_driver = {
341 .name = (char *) driver_name,
342 .bus = &platform_bus_type,
343 .probe = at91_cf_probe,
344 .remove = __exit_p(at91_cf_remove),
345 .suspend = pcmcia_socket_dev_suspend,
346 .resume = pcmcia_socket_dev_resume,
347};
348
349/*--------------------------------------------------------------------------*/
350
351static int __init at91_cf_init(void)
352{
353 return driver_register(&at91_cf_driver);
354}
355module_init(at91_cf_init);
356
357static void __exit at91_cf_exit(void)
358{
359 driver_unregister(&at91_cf_driver);
360}
361module_exit(at91_cf_exit);
362
363MODULE_DESCRIPTION("AT91 Compact Flash Driver");
364MODULE_AUTHOR("David Brownell");
365MODULE_LICENSE("GPL");