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2c1f3b7a AV |
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/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 | ||
2c1f3b7a AV |
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 | */ | |
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 | ||
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 | ||
53 | #define SZ_2K (2 * SZ_1K) | |
54 | ||
55 | static 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 | ||
62 | static int at91_cf_ss_init(struct pcmcia_socket *s) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static 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; | |
2c536200 DB |
77 | pr_debug("%s: card %s\n", driver_name, |
78 | present ? "present" : "gone"); | |
2c1f3b7a AV |
79 | pcmcia_parse_events(&cf->socket, SS_DETECT); |
80 | } | |
81 | } | |
82 | ||
83 | return IRQ_HANDLED; | |
84 | } | |
85 | ||
86 | static 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 | ||
2c536200 | 95 | /* NOTE: CF is always 3VCARD */ |
2c1f3b7a AV |
96 | 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 | ||
2c536200 DB |
111 | static int |
112 | at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) | |
2c1f3b7a AV |
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 | ||
141 | static 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 */ | |
147 | static 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 */ | |
2c536200 DB |
187 | static int |
188 | at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) | |
2c1f3b7a AV |
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_ATTR_PHYS; | |
200 | else | |
201 | map->static_start = 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 | ||
0db6095d | 217 | static int __init at91_cf_probe(struct platform_device *pdev) |
2c1f3b7a AV |
218 | { |
219 | struct at91_cf_socket *cf; | |
0db6095d | 220 | struct at91_cf_data *board = pdev->dev.platform_data; |
2c536200 | 221 | struct resource *io; |
2c1f3b7a AV |
222 | unsigned int csa; |
223 | int status; | |
224 | ||
225 | if (!board || !board->det_pin || !board->rst_pin) | |
226 | return -ENODEV; | |
227 | ||
2c536200 DB |
228 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
229 | if (!io) | |
230 | return -ENODEV; | |
231 | ||
2c1f3b7a AV |
232 | cf = kcalloc(1, sizeof *cf, GFP_KERNEL); |
233 | if (!cf) | |
234 | return -ENOMEM; | |
235 | ||
236 | cf->board = board; | |
237 | cf->pdev = pdev; | |
0db6095d | 238 | platform_set_drvdata(pdev, cf); |
2c1f3b7a AV |
239 | |
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 | */ | |
2c536200 DB |
258 | 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 */ | |
2c1f3b7a AV |
266 | ); |
267 | ||
268 | /* must be a GPIO; ergo must trigger on both edges */ | |
269 | status = request_irq(board->det_pin, at91_cf_irq, | |
dace1453 | 270 | IRQF_SAMPLE_RANDOM, driver_name, cf); |
2c1f3b7a AV |
271 | if (status < 0) |
272 | goto fail0; | |
0db6095d | 273 | device_init_wakeup(&pdev->dev, 1); |
2c1f3b7a AV |
274 | |
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, | |
dace1453 | 283 | IRQF_SHARED, driver_name, cf); |
2c1f3b7a AV |
284 | if (status < 0) |
285 | goto fail0a; | |
286 | cf->socket.pci_irq = board->irq_pin; | |
2c536200 | 287 | } else |
2c1f3b7a AV |
288 | 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 */ | |
2c536200 DB |
296 | if (!request_mem_region(io->start, io->end + 1 - io->start, |
297 | driver_name)) | |
2c1f3b7a AV |
298 | 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; | |
0db6095d | 304 | cf->socket.dev.dev = &pdev->dev; |
2c1f3b7a AV |
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 | |
308 | | SS_CAP_MEM_ALIGN; | |
309 | cf->socket.map_size = SZ_2K; | |
2c536200 | 310 | cf->socket.io[0].res = io; |
2c1f3b7a AV |
311 | |
312 | status = pcmcia_register_socket(&cf->socket); | |
313 | if (status < 0) | |
314 | goto fail2; | |
315 | ||
316 | return 0; | |
317 | ||
318 | fail2: | |
319 | iounmap((void __iomem *) cf->socket.io_offset); | |
2c536200 | 320 | release_mem_region(io->start, io->end + 1 - io->start); |
2c1f3b7a AV |
321 | fail1: |
322 | if (board->irq_pin) | |
323 | free_irq(board->irq_pin, cf); | |
324 | fail0a: | |
325 | free_irq(board->det_pin, cf); | |
0db6095d | 326 | device_init_wakeup(&pdev->dev, 0); |
2c1f3b7a AV |
327 | fail0: |
328 | at91_sys_write(AT91_EBI_CSA, csa); | |
329 | kfree(cf); | |
330 | return status; | |
331 | } | |
332 | ||
0db6095d | 333 | static int __exit at91_cf_remove(struct platform_device *pdev) |
2c1f3b7a | 334 | { |
0db6095d DB |
335 | struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
336 | struct at91_cf_data *board = cf->board; | |
2c536200 DB |
337 | struct resource *io = cf->socket.io[0].res; |
338 | unsigned int csa; | |
2c1f3b7a AV |
339 | |
340 | pcmcia_unregister_socket(&cf->socket); | |
0db6095d DB |
341 | 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); | |
2c1f3b7a | 345 | iounmap((void __iomem *) cf->socket.io_offset); |
2c536200 | 346 | release_mem_region(io->start, io->end + 1 - io->start); |
2c1f3b7a AV |
347 | |
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 | ||
0db6095d DB |
355 | #ifdef CONFIG_PM |
356 | ||
357 | static 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 | ||
374 | static 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 | ||
392 | static struct platform_driver at91_cf_driver = { | |
393 | .driver = { | |
394 | .name = (char *) driver_name, | |
395 | .owner = THIS_MODULE, | |
396 | }, | |
2c1f3b7a AV |
397 | .probe = at91_cf_probe, |
398 | .remove = __exit_p(at91_cf_remove), | |
0db6095d DB |
399 | .suspend = at91_cf_suspend, |
400 | .resume = at91_cf_resume, | |
2c1f3b7a AV |
401 | }; |
402 | ||
403 | /*--------------------------------------------------------------------------*/ | |
404 | ||
405 | static int __init at91_cf_init(void) | |
406 | { | |
0db6095d | 407 | return platform_driver_register(&at91_cf_driver); |
2c1f3b7a AV |
408 | } |
409 | module_init(at91_cf_init); | |
410 | ||
411 | static void __exit at91_cf_exit(void) | |
412 | { | |
0db6095d | 413 | platform_driver_unregister(&at91_cf_driver); |
2c1f3b7a AV |
414 | } |
415 | module_exit(at91_cf_exit); | |
416 | ||
417 | MODULE_DESCRIPTION("AT91 Compact Flash Driver"); | |
418 | MODULE_AUTHOR("David Brownell"); | |
419 | MODULE_LICENSE("GPL"); |