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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/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 
 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 == 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 
 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
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 
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          * 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
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 
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         if (IS_ERR(mc))
240                 return PTR_ERR(mc);
241 
242         return 0;
243 }
244 #else
245 static int at91_cf_dt_init(struct platform_device *pdev)
246 {
247         return -ENODEV;
248 }
249 #endif
250 
251 static int at91_cf_probe(struct platform_device *pdev)
252 {
253         struct at91_cf_socket   *cf;
254         struct at91_cf_data     *board = pdev->dev.platform_data;
255         struct resource         *io;
256         int                     status;
257 
258         if (!board) {
259                 status = at91_cf_dt_init(pdev);
260                 if (status)
261                         return status;
262 
263                 board = pdev->dev.platform_data;
264         }
265 
266         if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
267                 return -ENODEV;
268 
269         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
270         if (!io)
271                 return -ENODEV;
272 
273         cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
274         if (!cf)
275                 return -ENOMEM;
276 
277         cf->board = board;
278         cf->pdev = pdev;
279         cf->phys_baseaddr = io->start;
280         platform_set_drvdata(pdev, cf);
281 
282         /* must be a GPIO; ergo must trigger on both edges */
283         status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
284         if (status < 0)
285                 return status;
286 
287         status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
288                                         at91_cf_irq, 0, "at91_cf detect", cf);
289         if (status < 0)
290                 return status;
291 
292         device_init_wakeup(&pdev->dev, 1);
293 
294         status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
295         if (status < 0)
296                 goto fail0a;
297 
298         if (gpio_is_valid(board->vcc_pin)) {
299                 status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
300                 if (status < 0)
301                         goto fail0a;
302         }
303 
304         /*
305          * The card driver will request this irq later as needed.
306          * but it causes lots of "irqNN: nobody cared" messages
307          * unless we report that we handle everything (sigh).
308          * (Note:  DK board doesn't wire the IRQ pin...)
309          */
310         if (gpio_is_valid(board->irq_pin)) {
311                 status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
312                 if (status < 0)
313                         goto fail0a;
314 
315                 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
316                                         at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
317                 if (status < 0)
318                         goto fail0a;
319                 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
320         } else
321                 cf->socket.pci_irq = nr_irqs + 1;
322 
323         /*
324          * pcmcia layer only remaps "real" memory not iospace
325          * io_offset is set to 0x10000 to avoid the check in static_find_io().
326          * */
327         cf->socket.io_offset = 0x10000;
328         status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS);
329         if (status)
330                 goto fail0a;
331 
332         /* reserve chip-select regions */
333         if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
334                 status = -ENXIO;
335                 goto fail0a;
336         }
337 
338         dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
339                 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
340 
341         cf->socket.owner = THIS_MODULE;
342         cf->socket.dev.parent = &pdev->dev;
343         cf->socket.ops = &at91_cf_ops;
344         cf->socket.resource_ops = &pccard_static_ops;
345         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
346                                 | SS_CAP_MEM_ALIGN;
347         cf->socket.map_size = SZ_2K;
348         cf->socket.io[0].res = io;
349 
350         status = pcmcia_register_socket(&cf->socket);
351         if (status < 0)
352                 goto fail0a;
353 
354         return 0;
355 
356 fail0a:
357         device_init_wakeup(&pdev->dev, 0);
358         return status;
359 }
360 
361 static int at91_cf_remove(struct platform_device *pdev)
362 {
363         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
364 
365         pcmcia_unregister_socket(&cf->socket);
366         device_init_wakeup(&pdev->dev, 0);
367 
368         return 0;
369 }
370 
371 #ifdef  CONFIG_PM
372 
373 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
374 {
375         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
376         struct at91_cf_data     *board = cf->board;
377 
378         if (device_may_wakeup(&pdev->dev)) {
379                 enable_irq_wake(gpio_to_irq(board->det_pin));
380                 if (gpio_is_valid(board->irq_pin))
381                         enable_irq_wake(gpio_to_irq(board->irq_pin));
382         }
383         return 0;
384 }
385 
386 static int at91_cf_resume(struct platform_device *pdev)
387 {
388         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
389         struct at91_cf_data     *board = cf->board;
390 
391         if (device_may_wakeup(&pdev->dev)) {
392                 disable_irq_wake(gpio_to_irq(board->det_pin));
393                 if (gpio_is_valid(board->irq_pin))
394                         disable_irq_wake(gpio_to_irq(board->irq_pin));
395         }
396 
397         return 0;
398 }
399 
400 #else
401 #define at91_cf_suspend         NULL
402 #define at91_cf_resume          NULL
403 #endif
404 
405 static struct platform_driver at91_cf_driver = {
406         .driver = {
407                 .name           = "at91_cf",
408                 .of_match_table = of_match_ptr(at91_cf_dt_ids),
409         },
410         .probe          = at91_cf_probe,
411         .remove         = at91_cf_remove,
412         .suspend        = at91_cf_suspend,
413         .resume         = at91_cf_resume,
414 };
415 
416 module_platform_driver(at91_cf_driver);
417 
418 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
419 MODULE_AUTHOR("David Brownell");
420 MODULE_LICENSE("GPL");
421 MODULE_ALIAS("platform:at91_cf");
422 

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