1 /*
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/platform_device.h>
15 #include <linux/errno.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/slab.h>
19
20 #include <pcmcia/ss.h>
21
22 #include <mach/hardware.h>
23 #include <asm/io.h>
24 #include <asm/sizes.h>
25 #include <asm/gpio.h>
26
27 #include <mach/board.h>
28 #include <mach/at91rm9200_mc.h>
29
30
31 /*
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.
36 */
37 #define CF_ATTR_PHYS (0)
38 #define CF_IO_PHYS (1 << 23)
39 #define CF_MEM_PHYS (0x017ff800)
40
41 /*--------------------------------------------------------------------------*/
42
43 static const char driver_name[] = "at91_cf";
44
45 struct at91_cf_socket {
46 struct pcmcia_socket socket;
47
48 unsigned present:1;
49
50 struct platform_device *pdev;
51 struct at91_cf_data *board;
52
53 unsigned long phys_baseaddr;
54 };
55
at91_cf_present(struct at91_cf_socket * cf)56 static inline int at91_cf_present(struct at91_cf_socket *cf)
57 {
58 return !gpio_get_value(cf->board->det_pin);
59 }
60
61 /*--------------------------------------------------------------------------*/
62
at91_cf_ss_init(struct pcmcia_socket * s)63 static int at91_cf_ss_init(struct pcmcia_socket *s)
64 {
65 return 0;
66 }
67
at91_cf_irq(int irq,void * _cf)68 static irqreturn_t at91_cf_irq(int irq, void *_cf)
69 {
70 struct at91_cf_socket *cf = _cf;
71
72 if (irq == cf->board->det_pin) {
73 unsigned present = at91_cf_present(cf);
74
75 /* kick pccard as needed */
76 if (present != cf->present) {
77 cf->present = present;
78 pr_debug("%s: card %s\n", driver_name,
79 present ? "present" : "gone");
80 pcmcia_parse_events(&cf->socket, SS_DETECT);
81 }
82 }
83
84 return IRQ_HANDLED;
85 }
86
at91_cf_get_status(struct pcmcia_socket * s,u_int * sp)87 static 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: CF is always 3VCARD */
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 || gpio_get_value(rdy))
103 *sp |= SS_READY;
104 if (!vcc || gpio_get_value(vcc))
105 *sp |= SS_POWERON;
106 } else
107 *sp = 0;
108
109 return 0;
110 }
111
112 static int
at91_cf_set_socket(struct pcmcia_socket * sock,struct socket_state_t * s)113 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
114 {
115 struct at91_cf_socket *cf;
116
117 cf = container_of(sock, struct at91_cf_socket, socket);
118
119 /* switch Vcc if needed and possible */
120 if (cf->board->vcc_pin) {
121 switch (s->Vcc) {
122 case 0:
123 gpio_set_value(cf->board->vcc_pin, 0);
124 break;
125 case 33:
126 gpio_set_value(cf->board->vcc_pin, 1);
127 break;
128 default:
129 return -EINVAL;
130 }
131 }
132
133 /* toggle reset if needed */
134 gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
135
136 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
137 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
138
139 return 0;
140 }
141
at91_cf_ss_suspend(struct pcmcia_socket * s)142 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
143 {
144 return at91_cf_set_socket(s, &dead_socket);
145 }
146
147 /* we already mapped the I/O region */
at91_cf_set_io_map(struct pcmcia_socket * s,struct pccard_io_map * io)148 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
149 {
150 struct at91_cf_socket *cf;
151 u32 csr;
152
153 cf = container_of(s, struct at91_cf_socket, socket);
154 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
155
156 /*
157 * Use 16 bit accesses unless/until we need 8-bit i/o space.
158 */
159 csr = at91_sys_read(AT91_SMC_CSR(cf->board->chipselect)) & ~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(cf->board->chipselect), 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 */
187 static int
at91_cf_set_mem_map(struct pcmcia_socket * s,struct pccard_mem_map * map)188 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
189 {
190 struct at91_cf_socket *cf;
191
192 if (map->card_start)
193 return -EINVAL;
194
195 cf = container_of(s, struct at91_cf_socket, socket);
196
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;
200 else
201 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
202
203 return 0;
204 }
205
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,
213 };
214
215 /*--------------------------------------------------------------------------*/
216
at91_cf_probe(struct platform_device * pdev)217 static int __init at91_cf_probe(struct platform_device *pdev)
218 {
219 struct at91_cf_socket *cf;
220 struct at91_cf_data *board = pdev->dev.platform_data;
221 struct resource *io;
222 int status;
223
224 if (!board || !board->det_pin || !board->rst_pin)
225 return -ENODEV;
226
227 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
228 if (!io)
229 return -ENODEV;
230
231 cf = kzalloc(sizeof *cf, GFP_KERNEL);
232 if (!cf)
233 return -ENOMEM;
234
235 cf->board = board;
236 cf->pdev = pdev;
237 cf->phys_baseaddr = io->start;
238 platform_set_drvdata(pdev, cf);
239
240 /* must be a GPIO; ergo must trigger on both edges */
241 status = gpio_request(board->det_pin, "cf_det");
242 if (status < 0)
243 goto fail0;
244 status = request_irq(board->det_pin, at91_cf_irq, 0, driver_name, cf);
245 if (status < 0)
246 goto fail00;
247 device_init_wakeup(&pdev->dev, 1);
248
249 status = gpio_request(board->rst_pin, "cf_rst");
250 if (status < 0)
251 goto fail0a;
252
253 if (board->vcc_pin) {
254 status = gpio_request(board->vcc_pin, "cf_vcc");
255 if (status < 0)
256 goto fail0b;
257 }
258
259 /*
260 * The card driver will request this irq later as needed.
261 * but it causes lots of "irqNN: nobody cared" messages
262 * unless we report that we handle everything (sigh).
263 * (Note: DK board doesn't wire the IRQ pin...)
264 */
265 if (board->irq_pin) {
266 status = gpio_request(board->irq_pin, "cf_irq");
267 if (status < 0)
268 goto fail0c;
269 status = request_irq(board->irq_pin, at91_cf_irq,
270 IRQF_SHARED, driver_name, cf);
271 if (status < 0)
272 goto fail0d;
273 cf->socket.pci_irq = board->irq_pin;
274 } else
275 cf->socket.pci_irq = nr_irqs + 1;
276
277 /* pcmcia layer only remaps "real" memory not iospace */
278 cf->socket.io_offset = (unsigned long)
279 ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
280 if (!cf->socket.io_offset) {
281 status = -ENXIO;
282 goto fail1;
283 }
284
285 /* reserve chip-select regions */
286 if (!request_mem_region(io->start, resource_size(io), driver_name)) {
287 status = -ENXIO;
288 goto fail1;
289 }
290
291 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
292 board->det_pin, board->irq_pin);
293
294 cf->socket.owner = THIS_MODULE;
295 cf->socket.dev.parent = &pdev->dev;
296 cf->socket.ops = &at91_cf_ops;
297 cf->socket.resource_ops = &pccard_static_ops;
298 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
299 | SS_CAP_MEM_ALIGN;
300 cf->socket.map_size = SZ_2K;
301 cf->socket.io[0].res = io;
302
303 status = pcmcia_register_socket(&cf->socket);
304 if (status < 0)
305 goto fail2;
306
307 return 0;
308
309 fail2:
310 release_mem_region(io->start, resource_size(io));
311 fail1:
312 if (cf->socket.io_offset)
313 iounmap((void __iomem *) cf->socket.io_offset);
314 if (board->irq_pin) {
315 free_irq(board->irq_pin, cf);
316 fail0d:
317 gpio_free(board->irq_pin);
318 }
319 fail0c:
320 if (board->vcc_pin)
321 gpio_free(board->vcc_pin);
322 fail0b:
323 gpio_free(board->rst_pin);
324 fail0a:
325 device_init_wakeup(&pdev->dev, 0);
326 free_irq(board->det_pin, cf);
327 fail00:
328 gpio_free(board->det_pin);
329 fail0:
330 kfree(cf);
331 return status;
332 }
333
at91_cf_remove(struct platform_device * pdev)334 static int __exit at91_cf_remove(struct platform_device *pdev)
335 {
336 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
337 struct at91_cf_data *board = cf->board;
338 struct resource *io = cf->socket.io[0].res;
339
340 pcmcia_unregister_socket(&cf->socket);
341 release_mem_region(io->start, resource_size(io));
342 iounmap((void __iomem *) cf->socket.io_offset);
343 if (board->irq_pin) {
344 free_irq(board->irq_pin, cf);
345 gpio_free(board->irq_pin);
346 }
347 if (board->vcc_pin)
348 gpio_free(board->vcc_pin);
349 gpio_free(board->rst_pin);
350 device_init_wakeup(&pdev->dev, 0);
351 free_irq(board->det_pin, cf);
352 gpio_free(board->det_pin);
353 kfree(cf);
354 return 0;
355 }
356
357 #ifdef CONFIG_PM
358
at91_cf_suspend(struct platform_device * pdev,pm_message_t mesg)359 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
360 {
361 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
362 struct at91_cf_data *board = cf->board;
363
364 if (device_may_wakeup(&pdev->dev)) {
365 enable_irq_wake(board->det_pin);
366 if (board->irq_pin)
367 enable_irq_wake(board->irq_pin);
368 }
369 return 0;
370 }
371
at91_cf_resume(struct platform_device * pdev)372 static int at91_cf_resume(struct platform_device *pdev)
373 {
374 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
375 struct at91_cf_data *board = cf->board;
376
377 if (device_may_wakeup(&pdev->dev)) {
378 disable_irq_wake(board->det_pin);
379 if (board->irq_pin)
380 disable_irq_wake(board->irq_pin);
381 }
382
383 return 0;
384 }
385
386 #else
387 #define at91_cf_suspend NULL
388 #define at91_cf_resume NULL
389 #endif
390
391 static struct platform_driver at91_cf_driver = {
392 .driver = {
393 .name = (char *) driver_name,
394 .owner = THIS_MODULE,
395 },
396 .remove = __exit_p(at91_cf_remove),
397 .suspend = at91_cf_suspend,
398 .resume = at91_cf_resume,
399 };
400
401 /*--------------------------------------------------------------------------*/
402
at91_cf_init(void)403 static int __init at91_cf_init(void)
404 {
405 return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
406 }
407 module_init(at91_cf_init);
408
at91_cf_exit(void)409 static void __exit at91_cf_exit(void)
410 {
411 platform_driver_unregister(&at91_cf_driver);
412 }
413 module_exit(at91_cf_exit);
414
415 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
416 MODULE_AUTHOR("David Brownell");
417 MODULE_LICENSE("GPL");
418 MODULE_ALIAS("platform:at91_cf");
419