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
19 #include <pcmcia/ss.h>
20
21 #include <asm/hardware.h>
22 #include <asm/io.h>
23 #include <asm/sizes.h>
24 #include <asm/gpio.h>
25
26 #include <asm/arch/board.h>
27 #include <asm/arch/at91rm9200_mc.h>
28
29
30 /*
31 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
32 * some other bit in {A24,A22..A11} is nREG to flag memory access
33 * (vs attributes). So more than 2KB/region would just be waste.
34 * Note: These are offsets from the physical base address.
35 */
36 #define CF_ATTR_PHYS (0)
37 #define CF_IO_PHYS (1 << 23)
38 #define CF_MEM_PHYS (0x017ff800)
39
40 /*--------------------------------------------------------------------------*/
41
42 static const char driver_name[] = "at91_cf";
43
44 struct at91_cf_socket {
45 struct pcmcia_socket socket;
46
47 unsigned present:1;
48
49 struct platform_device *pdev;
50 struct at91_cf_data *board;
51
52 unsigned long phys_baseaddr;
53 };
54
55 #define SZ_2K (2 * SZ_1K)
56
57 static inline int at91_cf_present(struct at91_cf_socket *cf)
58 {
59 return !gpio_get_value(cf->board->det_pin);
60 }
61
62 /*--------------------------------------------------------------------------*/
63
64 static int at91_cf_ss_init(struct pcmcia_socket *s)
65 {
66 return 0;
67 }
68
69 static irqreturn_t at91_cf_irq(int irq, void *_cf)
70 {
71 struct at91_cf_socket *cf = _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,
80 present ? "present" : "gone");
81 pcmcia_parse_events(&cf->socket, SS_DETECT);
82 }
83 }
84
85 return IRQ_HANDLED;
86 }
87
88 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
89 {
90 struct at91_cf_socket *cf;
91
92 if (!sp)
93 return -EINVAL;
94
95 cf = container_of(s, struct at91_cf_socket, socket);
96
97 /* NOTE: CF is always 3VCARD */
98 if (at91_cf_present(cf)) {
99 int rdy = cf->board->irq_pin; /* RDY/nIRQ */
100 int vcc = cf->board->vcc_pin;
101
102 *sp = SS_DETECT | SS_3VCARD;
103 if (!rdy || gpio_get_value(rdy))
104 *sp |= SS_READY;
105 if (!vcc || gpio_get_value(vcc))
106 *sp |= SS_POWERON;
107 } else
108 *sp = 0;
109
110 return 0;
111 }
112
113 static int
114 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
115 {
116 struct at91_cf_socket *cf;
117
118 cf = container_of(sock, struct at91_cf_socket, socket);
119
120 /* switch Vcc if needed and possible */
121 if (cf->board->vcc_pin) {
122 switch (s->Vcc) {
123 case 0:
124 gpio_set_value(cf->board->vcc_pin, 0);
125 break;
126 case 33:
127 gpio_set_value(cf->board->vcc_pin, 1);
128 break;
129 default:
130 return -EINVAL;
131 }
132 }
133
134 /* toggle reset if needed */
135 gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
136
137 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
138 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
139
140 return 0;
141 }
142
143 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
144 {
145 return at91_cf_set_socket(s, &dead_socket);
146 }
147
148 /* we already mapped the I/O region */
149 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
150 {
151 struct at91_cf_socket *cf;
152 u32 csr;
153
154 cf = container_of(s, struct at91_cf_socket, socket);
155 io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
156
157 /*
158 * Use 16 bit accesses unless/until we need 8-bit i/o space.
159 */
160 csr = at91_sys_read(AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
161
162 /*
163 * NOTE: this CF controller ignores IOIS16, so we can't really do
164 * MAP_AUTOSZ. The 16bit mode allows single byte access on either
165 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
166 * purposes (and handles ide-cs).
167 *
168 * The 8bit mode is needed for odd byte access on D0-D7. It seems
169 * some cards only like that way to get at the odd byte, despite
170 * CF 3.0 spec table 35 also giving the D8-D15 option.
171 */
172 if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
173 csr |= AT91_SMC_DBW_8;
174 pr_debug("%s: 8bit i/o bus\n", driver_name);
175 } else {
176 csr |= AT91_SMC_DBW_16;
177 pr_debug("%s: 16bit i/o bus\n", driver_name);
178 }
179 at91_sys_write(AT91_SMC_CSR(cf->board->chipselect), csr);
180
181 io->start = cf->socket.io_offset;
182 io->stop = io->start + SZ_2K - 1;
183
184 return 0;
185 }
186
187 /* pcmcia layer maps/unmaps mem regions */
188 static int
189 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
190 {
191 struct at91_cf_socket *cf;
192
193 if (map->card_start)
194 return -EINVAL;
195
196 cf = container_of(s, struct at91_cf_socket, socket);
197
198 map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
199 if (map->flags & MAP_ATTRIB)
200 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
201 else
202 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
203
204 return 0;
205 }
206
207 static struct pccard_operations at91_cf_ops = {
208 .init = at91_cf_ss_init,
209 .suspend = at91_cf_ss_suspend,
210 .get_status = at91_cf_get_status,
211 .set_socket = at91_cf_set_socket,
212 .set_io_map = at91_cf_set_io_map,
213 .set_mem_map = at91_cf_set_mem_map,
214 };
215
216 /*--------------------------------------------------------------------------*/
217
218 static int __init at91_cf_probe(struct platform_device *pdev)
219 {
220 struct at91_cf_socket *cf;
221 struct at91_cf_data *board = pdev->dev.platform_data;
222 struct resource *io;
223 int status;
224
225 if (!board || !board->det_pin || !board->rst_pin)
226 return -ENODEV;
227
228 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
229 if (!io)
230 return -ENODEV;
231
232 cf = kzalloc(sizeof *cf, GFP_KERNEL);
233 if (!cf)
234 return -ENOMEM;
235
236 cf->board = board;
237 cf->pdev = pdev;
238 cf->phys_baseaddr = io->start;
239 platform_set_drvdata(pdev, cf);
240
241 /* must be a GPIO; ergo must trigger on both edges */
242 status = gpio_request(board->det_pin, "cf_det");
243 if (status < 0)
244 goto fail0;
245 status = request_irq(board->det_pin, at91_cf_irq, 0, driver_name, cf);
246 if (status < 0)
247 goto fail00;
248 device_init_wakeup(&pdev->dev, 1);
249
250 status = gpio_request(board->rst_pin, "cf_rst");
251 if (status < 0)
252 goto fail0a;
253
254 if (board->vcc_pin) {
255 status = gpio_request(board->vcc_pin, "cf_vcc");
256 if (status < 0)
257 goto fail0b;
258 }
259
260 /*
261 * The card driver will request this irq later as needed.
262 * but it causes lots of "irqNN: nobody cared" messages
263 * unless we report that we handle everything (sigh).
264 * (Note: DK board doesn't wire the IRQ pin...)
265 */
266 if (board->irq_pin) {
267 status = gpio_request(board->irq_pin, "cf_irq");
268 if (status < 0)
269 goto fail0c;
270 status = request_irq(board->irq_pin, at91_cf_irq,
271 IRQF_SHARED, driver_name, cf);
272 if (status < 0)
273 goto fail0d;
274 cf->socket.pci_irq = board->irq_pin;
275 } else
276 cf->socket.pci_irq = NR_IRQS + 1;
277
278 /* pcmcia layer only remaps "real" memory not iospace */
279 cf->socket.io_offset = (unsigned long)
280 ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
281 if (!cf->socket.io_offset) {
282 status = -ENXIO;
283 goto fail1;
284 }
285
286 /* reserve chip-select regions */
287 if (!request_mem_region(io->start, io->end + 1 - io->start,
288 driver_name)) {
289 status = -ENXIO;
290 goto fail1;
291 }
292
293 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
294 board->det_pin, board->irq_pin);
295
296 cf->socket.owner = THIS_MODULE;
297 cf->socket.dev.parent = &pdev->dev;
298 cf->socket.ops = &at91_cf_ops;
299 cf->socket.resource_ops = &pccard_static_ops;
300 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
301 | SS_CAP_MEM_ALIGN;
302 cf->socket.map_size = SZ_2K;
303 cf->socket.io[0].res = io;
304
305 status = pcmcia_register_socket(&cf->socket);
306 if (status < 0)
307 goto fail2;
308
309 return 0;
310
311 fail2:
312 release_mem_region(io->start, io->end + 1 - io->start);
313 fail1:
314 if (cf->socket.io_offset)
315 iounmap((void __iomem *) cf->socket.io_offset);
316 if (board->irq_pin) {
317 free_irq(board->irq_pin, cf);
318 fail0d:
319 gpio_free(board->irq_pin);
320 }
321 fail0c:
322 if (board->vcc_pin)
323 gpio_free(board->vcc_pin);
324 fail0b:
325 gpio_free(board->rst_pin);
326 fail0a:
327 device_init_wakeup(&pdev->dev, 0);
328 free_irq(board->det_pin, cf);
329 fail00:
330 gpio_free(board->det_pin);
331 fail0:
332 kfree(cf);
333 return status;
334 }
335
336 static int __exit at91_cf_remove(struct platform_device *pdev)
337 {
338 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
339 struct at91_cf_data *board = cf->board;
340 struct resource *io = cf->socket.io[0].res;
341
342 pcmcia_unregister_socket(&cf->socket);
343 release_mem_region(io->start, io->end + 1 - io->start);
344 iounmap((void __iomem *) cf->socket.io_offset);
345 if (board->irq_pin) {
346 free_irq(board->irq_pin, cf);
347 gpio_free(board->irq_pin);
348 }
349 if (board->vcc_pin)
350 gpio_free(board->vcc_pin);
351 gpio_free(board->rst_pin);
352 device_init_wakeup(&pdev->dev, 0);
353 free_irq(board->det_pin, cf);
354 gpio_free(board->det_pin);
355 kfree(cf);
356 return 0;
357 }
358
359 #ifdef CONFIG_PM
360
361 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
362 {
363 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
364 struct at91_cf_data *board = cf->board;
365
366 pcmcia_socket_dev_suspend(&pdev->dev, mesg);
367 if (device_may_wakeup(&pdev->dev)) {
368 enable_irq_wake(board->det_pin);
369 if (board->irq_pin)
370 enable_irq_wake(board->irq_pin);
371 }
372 return 0;
373 }
374
375 static int at91_cf_resume(struct platform_device *pdev)
376 {
377 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
378 struct at91_cf_data *board = cf->board;
379
380 if (device_may_wakeup(&pdev->dev)) {
381 disable_irq_wake(board->det_pin);
382 if (board->irq_pin)
383 disable_irq_wake(board->irq_pin);
384 }
385
386 pcmcia_socket_dev_resume(&pdev->dev);
387 return 0;
388 }
389
390 #else
391 #define at91_cf_suspend NULL
392 #define at91_cf_resume NULL
393 #endif
394
395 static struct platform_driver at91_cf_driver = {
396 .driver = {
397 .name = (char *) driver_name,
398 .owner = THIS_MODULE,
399 },
400 .remove = __exit_p(at91_cf_remove),
401 .suspend = at91_cf_suspend,
402 .resume = at91_cf_resume,
403 };
404
405 /*--------------------------------------------------------------------------*/
406
407 static int __init at91_cf_init(void)
408 {
409 return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
410 }
411 module_init(at91_cf_init);
412
413 static void __exit at91_cf_exit(void)
414 {
415 platform_driver_unregister(&at91_cf_driver);
416 }
417 module_exit(at91_cf_exit);
418
419 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
420 MODULE_AUTHOR("David Brownell");
421 MODULE_LICENSE("GPL");
422 MODULE_ALIAS("platform:at91_cf");
423
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