blob: 40569f40e90e8f44d54968413c3dc166de45d620 [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
Andrew Victor2c1f3b72006-02-21 12:56:52 +020031/*
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 */
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)
39
40/*--------------------------------------------------------------------------*/
41
42static const char driver_name[] = "at91_cf";
43
44struct 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
53#define SZ_2K (2 * SZ_1K)
54
55static inline int at91_cf_present(struct at91_cf_socket *cf)
56{
57 return !at91_get_gpio_value(cf->board->det_pin);
58}
59
60/*--------------------------------------------------------------------------*/
61
62static int at91_cf_ss_init(struct pcmcia_socket *s)
63{
64 return 0;
65}
66
67static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r)
68{
69 struct at91_cf_socket *cf = (struct at91_cf_socket *) _cf;
70
71 if (irq == cf->board->det_pin) {
72 unsigned present = at91_cf_present(cf);
73
74 /* kick pccard as needed */
75 if (present != cf->present) {
76 cf->present = present;
David Brownell2c536202006-04-14 18:05:38 -070077 pr_debug("%s: card %s\n", driver_name,
78 present ? "present" : "gone");
Andrew Victor2c1f3b72006-02-21 12:56:52 +020079 pcmcia_parse_events(&cf->socket, SS_DETECT);
80 }
81 }
82
83 return IRQ_HANDLED;
84}
85
86static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
87{
88 struct at91_cf_socket *cf;
89
90 if (!sp)
91 return -EINVAL;
92
93 cf = container_of(s, struct at91_cf_socket, socket);
94
David Brownell2c536202006-04-14 18:05:38 -070095 /* NOTE: CF is always 3VCARD */
Andrew Victor2c1f3b72006-02-21 12:56:52 +020096 if (at91_cf_present(cf)) {
97 int rdy = cf->board->irq_pin; /* RDY/nIRQ */
98 int vcc = cf->board->vcc_pin;
99
100 *sp = SS_DETECT | SS_3VCARD;
101 if (!rdy || at91_get_gpio_value(rdy))
102 *sp |= SS_READY;
103 if (!vcc || at91_get_gpio_value(vcc))
104 *sp |= SS_POWERON;
105 } else
106 *sp = 0;
107
108 return 0;
109}
110
David Brownell2c536202006-04-14 18:05:38 -0700111static int
112at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200113{
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 */
David Brownell2c536202006-04-14 18:05:38 -0700187static int
188at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200189{
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_ATTR_PHYS;
200 else
201 map->static_start = CF_MEM_PHYS;
202
203 return 0;
204}
205
206static 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
David Brownell0db60952006-04-19 06:37:48 -0700217static int __init at91_cf_probe(struct platform_device *pdev)
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200218{
219 struct at91_cf_socket *cf;
David Brownell0db60952006-04-19 06:37:48 -0700220 struct at91_cf_data *board = pdev->dev.platform_data;
David Brownell2c536202006-04-14 18:05:38 -0700221 struct resource *io;
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200222 unsigned int csa;
223 int status;
224
225 if (!board || !board->det_pin || !board->rst_pin)
226 return -ENODEV;
227
David Brownell2c536202006-04-14 18:05:38 -0700228 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
229 if (!io)
230 return -ENODEV;
231
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200232 cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
233 if (!cf)
234 return -ENOMEM;
235
236 cf->board = board;
237 cf->pdev = pdev;
David Brownell0db60952006-04-19 06:37:48 -0700238 platform_set_drvdata(pdev, cf);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200239
240 /* CF takes over CS4, CS5, CS6 */
241 csa = at91_sys_read(AT91_EBI_CSA);
242 at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
243
244 /* force poweron defaults for these pins ... */
245 (void) at91_set_A_periph(AT91_PIN_PC9, 0); /* A25/CFRNW */
246 (void) at91_set_A_periph(AT91_PIN_PC10, 0); /* NCS4/CFCS */
247 (void) at91_set_A_periph(AT91_PIN_PC11, 0); /* NCS5/CFCE1 */
248 (void) at91_set_A_periph(AT91_PIN_PC12, 0); /* NCS6/CFCE2 */
249
250 /* nWAIT is _not_ a default setting */
251 (void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */
252
253 /*
254 * Static memory controller timing adjustments.
255 * REVISIT: these timings are in terms of MCK cycles, so
256 * when MCK changes (cpufreq etc) so must these values...
257 */
David Brownell2c536202006-04-14 18:05:38 -0700258 at91_sys_write(AT91_SMC_CSR(4),
259 AT91_SMC_ACSS_STD
260 | AT91_SMC_DBW_16
261 | AT91_SMC_BAT
262 | AT91_SMC_WSEN
263 | AT91_SMC_NWS_(32) /* wait states */
264 | AT91_SMC_RWSETUP_(6) /* setup time */
265 | AT91_SMC_RWHOLD_(4) /* hold time */
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200266 );
267
268 /* must be a GPIO; ergo must trigger on both edges */
269 status = request_irq(board->det_pin, at91_cf_irq,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700270 IRQF_SAMPLE_RANDOM, driver_name, cf);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200271 if (status < 0)
272 goto fail0;
David Brownell0db60952006-04-19 06:37:48 -0700273 device_init_wakeup(&pdev->dev, 1);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200274
275 /*
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...)
280 */
281 if (board->irq_pin) {
282 status = request_irq(board->irq_pin, at91_cf_irq,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700283 IRQF_SHARED, driver_name, cf);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200284 if (status < 0)
285 goto fail0a;
286 cf->socket.pci_irq = board->irq_pin;
David Brownell2c536202006-04-14 18:05:38 -0700287 } else
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200288 cf->socket.pci_irq = NR_IRQS + 1;
289
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)
293 goto fail1;
294
295 /* reserve CS4, CS5, and CS6 regions; but use just CS4 */
David Brownell2c536202006-04-14 18:05:38 -0700296 if (!request_mem_region(io->start, io->end + 1 - io->start,
297 driver_name))
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200298 goto fail1;
299
300 pr_info("%s: irqs det #%d, io #%d\n", driver_name,
301 board->det_pin, board->irq_pin);
302
303 cf->socket.owner = THIS_MODULE;
David Brownell0db60952006-04-19 06:37:48 -0700304 cf->socket.dev.dev = &pdev->dev;
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200305 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
308 | SS_CAP_MEM_ALIGN;
309 cf->socket.map_size = SZ_2K;
David Brownell2c536202006-04-14 18:05:38 -0700310 cf->socket.io[0].res = io;
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200311
312 status = pcmcia_register_socket(&cf->socket);
313 if (status < 0)
314 goto fail2;
315
316 return 0;
317
318fail2:
319 iounmap((void __iomem *) cf->socket.io_offset);
David Brownell2c536202006-04-14 18:05:38 -0700320 release_mem_region(io->start, io->end + 1 - io->start);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200321fail1:
322 if (board->irq_pin)
323 free_irq(board->irq_pin, cf);
324fail0a:
325 free_irq(board->det_pin, cf);
David Brownell0db60952006-04-19 06:37:48 -0700326 device_init_wakeup(&pdev->dev, 0);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200327fail0:
328 at91_sys_write(AT91_EBI_CSA, csa);
329 kfree(cf);
330 return status;
331}
332
David Brownell0db60952006-04-19 06:37:48 -0700333static int __exit at91_cf_remove(struct platform_device *pdev)
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200334{
David Brownell0db60952006-04-19 06:37:48 -0700335 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
336 struct at91_cf_data *board = cf->board;
David Brownell2c536202006-04-14 18:05:38 -0700337 struct resource *io = cf->socket.io[0].res;
338 unsigned int csa;
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200339
340 pcmcia_unregister_socket(&cf->socket);
David Brownell0db60952006-04-19 06:37:48 -0700341 if (board->irq_pin)
342 free_irq(board->irq_pin, cf);
343 free_irq(board->det_pin, cf);
344 device_init_wakeup(&pdev->dev, 0);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200345 iounmap((void __iomem *) cf->socket.io_offset);
David Brownell2c536202006-04-14 18:05:38 -0700346 release_mem_region(io->start, io->end + 1 - io->start);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200347
348 csa = at91_sys_read(AT91_EBI_CSA);
349 at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
350
351 kfree(cf);
352 return 0;
353}
354
David Brownell0db60952006-04-19 06:37:48 -0700355#ifdef CONFIG_PM
356
357static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
358{
359 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
360 struct at91_cf_data *board = cf->board;
361
362 pcmcia_socket_dev_suspend(&pdev->dev, mesg);
363 if (device_may_wakeup(&pdev->dev))
364 enable_irq_wake(board->det_pin);
365 else {
366 disable_irq_wake(board->det_pin);
367 disable_irq(board->det_pin);
368 }
369 if (board->irq_pin)
370 disable_irq(board->irq_pin);
371 return 0;
372}
373
374static int at91_cf_resume(struct platform_device *pdev)
375{
376 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
377 struct at91_cf_data *board = cf->board;
378
379 if (board->irq_pin)
380 enable_irq(board->irq_pin);
381 if (!device_may_wakeup(&pdev->dev))
382 enable_irq(board->det_pin);
383 pcmcia_socket_dev_resume(&pdev->dev);
384 return 0;
385}
386
387#else
388#define at91_cf_suspend NULL
389#define at91_cf_resume NULL
390#endif
391
392static struct platform_driver at91_cf_driver = {
393 .driver = {
394 .name = (char *) driver_name,
395 .owner = THIS_MODULE,
396 },
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200397 .probe = at91_cf_probe,
398 .remove = __exit_p(at91_cf_remove),
David Brownell0db60952006-04-19 06:37:48 -0700399 .suspend = at91_cf_suspend,
400 .resume = at91_cf_resume,
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200401};
402
403/*--------------------------------------------------------------------------*/
404
405static int __init at91_cf_init(void)
406{
David Brownell0db60952006-04-19 06:37:48 -0700407 return platform_driver_register(&at91_cf_driver);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200408}
409module_init(at91_cf_init);
410
411static void __exit at91_cf_exit(void)
412{
David Brownell0db60952006-04-19 06:37:48 -0700413 platform_driver_unregister(&at91_cf_driver);
Andrew Victor2c1f3b72006-02-21 12:56:52 +0200414}
415module_exit(at91_cf_exit);
416
417MODULE_DESCRIPTION("AT91 Compact Flash Driver");
418MODULE_AUTHOR("David Brownell");
419MODULE_LICENSE("GPL");