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 #include <linux/gpio.h>
20 #include <linux/platform_data/atmel.h>
21 #include <linux/io.h>
22 #include <linux/sizes.h>
23 #include <linux/mfd/syscon.h>
24 #include <linux/mfd/syscon/atmel-mc.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/of_gpio.h>
28 #include <linux/regmap.h>
29
30 #include <pcmcia/ss.h>
31
32 /*
33 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
34 * some other bit in {A24,A22..A11} is nREG to flag memory access
35 * (vs attributes). So more than 2KB/region would just be waste.
36 * Note: These are offsets from the physical base address.
37 */
38 #define CF_ATTR_PHYS (0)
39 #define CF_IO_PHYS (1 << 23)
40 #define CF_MEM_PHYS (0x017ff800)
41
42 struct regmap *mc;
43
44 /*--------------------------------------------------------------------------*/
45
46 struct 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 unsigned long phys_baseaddr;
55 };
56
at91_cf_present(struct at91_cf_socket * cf)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
at91_cf_ss_init(struct pcmcia_socket * s)64 static int at91_cf_ss_init(struct pcmcia_socket *s)
65 {
66 return 0;
67 }
68
at91_cf_irq(int irq,void * _cf)69 static irqreturn_t at91_cf_irq(int irq, void *_cf)
70 {
71 struct at91_cf_socket *cf = _cf;
72
73 if (irq == gpio_to_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 dev_dbg(&cf->pdev->dev, "card %s\n",
80 present ? "present" : "gone");
81 pcmcia_parse_events(&cf->socket, SS_DETECT);
82 }
83 }
84
85 return IRQ_HANDLED;
86 }
87
at91_cf_get_status(struct pcmcia_socket * s,u_int * sp)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 = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
100 int vcc = gpio_is_valid(cf->board->vcc_pin);
101
102 *sp = SS_DETECT | SS_3VCARD;
103 if (!rdy || gpio_get_value(cf->board->irq_pin))
104 *sp |= SS_READY;
105 if (!vcc || gpio_get_value(cf->board->vcc_pin))
106 *sp |= SS_POWERON;
107 } else
108 *sp = 0;
109
110 return 0;
111 }
112
113 static int
at91_cf_set_socket(struct pcmcia_socket * sock,struct socket_state_t * s)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 (gpio_is_valid(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 dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
138 s->Vcc, s->io_irq, s->flags, s->csc_mask);
139
140 return 0;
141 }
142
at91_cf_ss_suspend(struct pcmcia_socket * s)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 */
at91_cf_set_io_map(struct pcmcia_socket * s,struct pccard_io_map * io)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 * NOTE: this CF controller ignores IOIS16, so we can't really do
161 * MAP_AUTOSZ. The 16bit mode allows single byte access on either
162 * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
163 * purposes (and handles ide-cs).
164 *
165 * The 8bit mode is needed for odd byte access on D0-D7. It seems
166 * some cards only like that way to get at the odd byte, despite
167 * CF 3.0 spec table 35 also giving the D8-D15 option.
168 */
169 if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
170 csr = AT91_MC_SMC_DBW_8;
171 dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
172 } else {
173 csr = AT91_MC_SMC_DBW_16;
174 dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
175 }
176 regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect),
177 AT91_MC_SMC_DBW, csr);
178
179 io->start = cf->socket.io_offset;
180 io->stop = io->start + SZ_2K - 1;
181
182 return 0;
183 }
184
185 /* pcmcia layer maps/unmaps mem regions */
186 static int
at91_cf_set_mem_map(struct pcmcia_socket * s,struct pccard_mem_map * map)187 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->phys_baseaddr + CF_ATTR_PHYS;
199 else
200 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
201
202 return 0;
203 }
204
205 static 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
216 #if defined(CONFIG_OF)
217 static const struct of_device_id at91_cf_dt_ids[] = {
218 { .compatible = "atmel,at91rm9200-cf" },
219 { /* sentinel */ }
220 };
221 MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);
222
at91_cf_dt_init(struct platform_device * pdev)223 static int at91_cf_dt_init(struct platform_device *pdev)
224 {
225 struct at91_cf_data *board;
226
227 board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
228 if (!board)
229 return -ENOMEM;
230
231 board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
232 board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
233 board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
234 board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);
235
236 pdev->dev.platform_data = board;
237
238 mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
239
240 return PTR_ERR_OR_ZERO(mc);
241 }
242 #else
at91_cf_dt_init(struct platform_device * pdev)243 static int at91_cf_dt_init(struct platform_device *pdev)
244 {
245 return -ENODEV;
246 }
247 #endif
248
at91_cf_probe(struct platform_device * pdev)249 static int at91_cf_probe(struct platform_device *pdev)
250 {
251 struct at91_cf_socket *cf;
252 struct at91_cf_data *board = pdev->dev.platform_data;
253 struct resource *io;
254 int status;
255
256 if (!board) {
257 status = at91_cf_dt_init(pdev);
258 if (status)
259 return status;
260
261 board = pdev->dev.platform_data;
262 }
263
264 if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
265 return -ENODEV;
266
267 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
268 if (!io)
269 return -ENODEV;
270
271 cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
272 if (!cf)
273 return -ENOMEM;
274
275 cf->board = board;
276 cf->pdev = pdev;
277 cf->phys_baseaddr = io->start;
278 platform_set_drvdata(pdev, cf);
279
280 /* must be a GPIO; ergo must trigger on both edges */
281 status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
282 if (status < 0)
283 return status;
284
285 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
286 at91_cf_irq, 0, "at91_cf detect", cf);
287 if (status < 0)
288 return status;
289
290 device_init_wakeup(&pdev->dev, 1);
291
292 status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
293 if (status < 0)
294 goto fail0a;
295
296 if (gpio_is_valid(board->vcc_pin)) {
297 status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
298 if (status < 0)
299 goto fail0a;
300 }
301
302 /*
303 * The card driver will request this irq later as needed.
304 * but it causes lots of "irqNN: nobody cared" messages
305 * unless we report that we handle everything (sigh).
306 * (Note: DK board doesn't wire the IRQ pin...)
307 */
308 if (gpio_is_valid(board->irq_pin)) {
309 status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
310 if (status < 0)
311 goto fail0a;
312
313 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
314 at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
315 if (status < 0)
316 goto fail0a;
317 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
318 } else
319 cf->socket.pci_irq = nr_irqs + 1;
320
321 /*
322 * pcmcia layer only remaps "real" memory not iospace
323 * io_offset is set to 0x10000 to avoid the check in static_find_io().
324 * */
325 cf->socket.io_offset = 0x10000;
326 status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS);
327 if (status)
328 goto fail0a;
329
330 /* reserve chip-select regions */
331 if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
332 status = -ENXIO;
333 goto fail0a;
334 }
335
336 dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
337 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
338
339 cf->socket.owner = THIS_MODULE;
340 cf->socket.dev.parent = &pdev->dev;
341 cf->socket.ops = &at91_cf_ops;
342 cf->socket.resource_ops = &pccard_static_ops;
343 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
344 | SS_CAP_MEM_ALIGN;
345 cf->socket.map_size = SZ_2K;
346 cf->socket.io[0].res = io;
347
348 status = pcmcia_register_socket(&cf->socket);
349 if (status < 0)
350 goto fail0a;
351
352 return 0;
353
354 fail0a:
355 device_init_wakeup(&pdev->dev, 0);
356 return status;
357 }
358
at91_cf_remove(struct platform_device * pdev)359 static int at91_cf_remove(struct platform_device *pdev)
360 {
361 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
362
363 pcmcia_unregister_socket(&cf->socket);
364 device_init_wakeup(&pdev->dev, 0);
365
366 return 0;
367 }
368
369 #ifdef CONFIG_PM
370
at91_cf_suspend(struct platform_device * pdev,pm_message_t mesg)371 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
372 {
373 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
374 struct at91_cf_data *board = cf->board;
375
376 if (device_may_wakeup(&pdev->dev)) {
377 enable_irq_wake(gpio_to_irq(board->det_pin));
378 if (gpio_is_valid(board->irq_pin))
379 enable_irq_wake(gpio_to_irq(board->irq_pin));
380 }
381 return 0;
382 }
383
at91_cf_resume(struct platform_device * pdev)384 static int at91_cf_resume(struct platform_device *pdev)
385 {
386 struct at91_cf_socket *cf = platform_get_drvdata(pdev);
387 struct at91_cf_data *board = cf->board;
388
389 if (device_may_wakeup(&pdev->dev)) {
390 disable_irq_wake(gpio_to_irq(board->det_pin));
391 if (gpio_is_valid(board->irq_pin))
392 disable_irq_wake(gpio_to_irq(board->irq_pin));
393 }
394
395 return 0;
396 }
397
398 #else
399 #define at91_cf_suspend NULL
400 #define at91_cf_resume NULL
401 #endif
402
403 static struct platform_driver at91_cf_driver = {
404 .driver = {
405 .name = "at91_cf",
406 .of_match_table = of_match_ptr(at91_cf_dt_ids),
407 },
408 .probe = at91_cf_probe,
409 .remove = at91_cf_remove,
410 .suspend = at91_cf_suspend,
411 .resume = at91_cf_resume,
412 };
413
414 module_platform_driver(at91_cf_driver);
415
416 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
417 MODULE_AUTHOR("David Brownell");
418 MODULE_LICENSE("GPL");
419 MODULE_ALIAS("platform:at91_cf");
420
