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Linux/drivers/pcmcia/at91_cf.c

  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/of.h>
 24 #include <linux/of_device.h>
 25 #include <linux/of_gpio.h>
 26 
 27 #include <pcmcia/ss.h>
 28 
 29 #include <mach/at91rm9200_mc.h>
 30 #include <mach/at91_ramc.h>
 31 
 32 
 33 /*
 34  * A0..A10 work in each range; A23 indicates I/O space;  A25 is CFRNW;
 35  * some other bit in {A24,A22..A11} is nREG to flag memory access
 36  * (vs attributes).  So more than 2KB/region would just be waste.
 37  * Note: These are offsets from the physical base address.
 38  */
 39 #define CF_ATTR_PHYS    (0)
 40 #define CF_IO_PHYS      (1 << 23)
 41 #define CF_MEM_PHYS     (0x017ff800)
 42 
 43 /*--------------------------------------------------------------------------*/
 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 
 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 
 63 static int at91_cf_ss_init(struct pcmcia_socket *s)
 64 {
 65         return 0;
 66 }
 67 
 68 static irqreturn_t at91_cf_irq(int irq, void *_cf)
 69 {
 70         struct at91_cf_socket *cf = _cf;
 71 
 72         if (irq == gpio_to_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                         dev_dbg(&cf->pdev->dev, "card %s\n",
 79                                         present ? "present" : "gone");
 80                         pcmcia_parse_events(&cf->socket, SS_DETECT);
 81                 }
 82         }
 83 
 84         return IRQ_HANDLED;
 85 }
 86 
 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 = gpio_is_valid(cf->board->irq_pin);    /* RDY/nIRQ */
 99                 int vcc = gpio_is_valid(cf->board->vcc_pin);
100 
101                 *sp = SS_DETECT | SS_3VCARD;
102                 if (!rdy || gpio_get_value(cf->board->irq_pin))
103                         *sp |= SS_READY;
104                 if (!vcc || gpio_get_value(cf->board->vcc_pin))
105                         *sp |= SS_POWERON;
106         } else
107                 *sp = 0;
108 
109         return 0;
110 }
111 
112 static int
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 (gpio_is_valid(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         dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
137                                 s->Vcc, s->io_irq, s->flags, s->csc_mask);
138 
139         return 0;
140 }
141 
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 */
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_ramc_read(0, 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                 dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
174         } else {
175                 csr |= AT91_SMC_DBW_16;
176                 dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
177         }
178         at91_ramc_write(0, 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
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 
217 #if defined(CONFIG_OF)
218 static const struct of_device_id at91_cf_dt_ids[] = {
219         { .compatible = "atmel,at91rm9200-cf" },
220         { /* sentinel */ }
221 };
222 MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);
223 
224 static int at91_cf_dt_init(struct platform_device *pdev)
225 {
226         struct at91_cf_data *board;
227 
228         board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
229         if (!board)
230                 return -ENOMEM;
231 
232         board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
233         board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
234         board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
235         board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);
236 
237         pdev->dev.platform_data = board;
238 
239         return 0;
240 }
241 #else
242 static int at91_cf_dt_init(struct platform_device *pdev)
243 {
244         return -ENODEV;
245 }
246 #endif
247 
248 static int at91_cf_probe(struct platform_device *pdev)
249 {
250         struct at91_cf_socket   *cf;
251         struct at91_cf_data     *board = pdev->dev.platform_data;
252         struct resource         *io;
253         int                     status;
254 
255         if (!board) {
256                 status = at91_cf_dt_init(pdev);
257                 if (status)
258                         return status;
259 
260                 board = pdev->dev.platform_data;
261         }
262 
263         if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
264                 return -ENODEV;
265 
266         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
267         if (!io)
268                 return -ENODEV;
269 
270         cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
271         if (!cf)
272                 return -ENOMEM;
273 
274         cf->board = board;
275         cf->pdev = pdev;
276         cf->phys_baseaddr = io->start;
277         platform_set_drvdata(pdev, cf);
278 
279         /* must be a GPIO; ergo must trigger on both edges */
280         status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
281         if (status < 0)
282                 return status;
283 
284         status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
285                                         at91_cf_irq, 0, "at91_cf detect", cf);
286         if (status < 0)
287                 return status;
288 
289         device_init_wakeup(&pdev->dev, 1);
290 
291         status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
292         if (status < 0)
293                 goto fail0a;
294 
295         if (gpio_is_valid(board->vcc_pin)) {
296                 status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
297                 if (status < 0)
298                         goto fail0a;
299         }
300 
301         /*
302          * The card driver will request this irq later as needed.
303          * but it causes lots of "irqNN: nobody cared" messages
304          * unless we report that we handle everything (sigh).
305          * (Note:  DK board doesn't wire the IRQ pin...)
306          */
307         if (gpio_is_valid(board->irq_pin)) {
308                 status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
309                 if (status < 0)
310                         goto fail0a;
311 
312                 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
313                                         at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
314                 if (status < 0)
315                         goto fail0a;
316                 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
317         } else
318                 cf->socket.pci_irq = nr_irqs + 1;
319 
320         /* pcmcia layer only remaps "real" memory not iospace */
321         cf->socket.io_offset = (unsigned long) devm_ioremap(&pdev->dev,
322                                         cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
323         if (!cf->socket.io_offset) {
324                 status = -ENXIO;
325                 goto fail0a;
326         }
327 
328         /* reserve chip-select regions */
329         if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
330                 status = -ENXIO;
331                 goto fail0a;
332         }
333 
334         dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
335                 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
336 
337         cf->socket.owner = THIS_MODULE;
338         cf->socket.dev.parent = &pdev->dev;
339         cf->socket.ops = &at91_cf_ops;
340         cf->socket.resource_ops = &pccard_static_ops;
341         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
342                                 | SS_CAP_MEM_ALIGN;
343         cf->socket.map_size = SZ_2K;
344         cf->socket.io[0].res = io;
345 
346         status = pcmcia_register_socket(&cf->socket);
347         if (status < 0)
348                 goto fail0a;
349 
350         return 0;
351 
352 fail0a:
353         device_init_wakeup(&pdev->dev, 0);
354         return status;
355 }
356 
357 static int at91_cf_remove(struct platform_device *pdev)
358 {
359         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
360 
361         pcmcia_unregister_socket(&cf->socket);
362         device_init_wakeup(&pdev->dev, 0);
363 
364         return 0;
365 }
366 
367 #ifdef  CONFIG_PM
368 
369 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
370 {
371         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
372         struct at91_cf_data     *board = cf->board;
373 
374         if (device_may_wakeup(&pdev->dev)) {
375                 enable_irq_wake(gpio_to_irq(board->det_pin));
376                 if (gpio_is_valid(board->irq_pin))
377                         enable_irq_wake(gpio_to_irq(board->irq_pin));
378         }
379         return 0;
380 }
381 
382 static int at91_cf_resume(struct platform_device *pdev)
383 {
384         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
385         struct at91_cf_data     *board = cf->board;
386 
387         if (device_may_wakeup(&pdev->dev)) {
388                 disable_irq_wake(gpio_to_irq(board->det_pin));
389                 if (gpio_is_valid(board->irq_pin))
390                         disable_irq_wake(gpio_to_irq(board->irq_pin));
391         }
392 
393         return 0;
394 }
395 
396 #else
397 #define at91_cf_suspend         NULL
398 #define at91_cf_resume          NULL
399 #endif
400 
401 static struct platform_driver at91_cf_driver = {
402         .driver = {
403                 .name           = "at91_cf",
404                 .owner          = THIS_MODULE,
405                 .of_match_table = of_match_ptr(at91_cf_dt_ids),
406         },
407         .probe          = at91_cf_probe,
408         .remove         = at91_cf_remove,
409         .suspend        = at91_cf_suspend,
410         .resume         = at91_cf_resume,
411 };
412 
413 module_platform_driver(at91_cf_driver);
414 
415 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
416 MODULE_AUTHOR("David Brownell");
417 MODULE_LICENSE("GPL");
418 MODULE_ALIAS("platform:at91_cf");
419 

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