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
  22 #include <pcmcia/ss.h>
  23
  24 #include <mach/hardware.h>
  25 #include <asm/io.h>
  26 #include <asm/sizes.h>
  27
  28 #include <mach/at91rm9200_mc.h>
  29 #include <mach/at91_ramc.h>
  30
  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 /*--------------------------------------------------------------------------*/
  43
  44 static const char driver_name[] = "at91_cf";
  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                         pr_debug("%s: card %s\n", driver_name,
  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(rdy))
 104                         *sp |= SS_READY;
 105                 if (!vcc || gpio_get_value(vcc))
 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         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 138                 driver_name, 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         csr = at91_ramc_read(0, AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
 161
 162         /*
 163          * NOTE: this CF controller ignores IOIS16, so we can't really do
 164          * MAP_AUTOSZ.  The 16bit mode allows single byte access on either
 165          * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
 166          * purposes (and handles ide-cs).
 167          *
 168          * The 8bit mode is needed for odd byte access on D0-D7.  It seems
 169          * some cards only like that way to get at the odd byte, despite
 170          * CF 3.0 spec table 35 also giving the D8-D15 option.
 171          */
 172         if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
 173                 csr |= AT91_SMC_DBW_8;
 174                 pr_debug("%s: 8bit i/o bus\n", driver_name);
 175         } else {
 176                 csr |= AT91_SMC_DBW_16;
 177                 pr_debug("%s: 16bit i/o bus\n", driver_name);
 178         }
 179         at91_ramc_write(0, AT91_SMC_CSR(cf->board->chipselect), csr);
 180
 181         io->start = cf->socket.io_offset;
 182         io->stop = io->start + SZ_2K - 1;
 183
 184         return 0;
 185 }
 186
 187 /* pcmcia layer maps/unmaps mem regions */
 188 static int
 189 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 190 {
 191         struct at91_cf_socket   *cf;
 192
 193         if (map->card_start)
 194                 return -EINVAL;
 195
 196         cf = container_of(s, struct at91_cf_socket, socket);
 197
 198         map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
 199         if (map->flags & MAP_ATTRIB)
 200                 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
 201         else
 202                 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
 203
 204         return 0;
 205 }
 206
 207 static struct pccard_operations at91_cf_ops = {
 208         .init                   = at91_cf_ss_init,
 209         .suspend                = at91_cf_ss_suspend,
 210         .get_status             = at91_cf_get_status,
 211         .set_socket             = at91_cf_set_socket,
 212         .set_io_map             = at91_cf_set_io_map,
 213         .set_mem_map            = at91_cf_set_mem_map,
 214 };
 215
 216 /*--------------------------------------------------------------------------*/
 217
 218 static int __init at91_cf_probe(struct platform_device *pdev)
 219 {
 220         struct at91_cf_socket   *cf;
 221         struct at91_cf_data     *board = pdev->dev.platform_data;
 222         struct resource         *io;
 223         int                     status;
 224
 225         if (!board || !gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
 226                 return -ENODEV;
 227
 228         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 229         if (!io)
 230                 return -ENODEV;
 231
 232         cf = kzalloc(sizeof *cf, GFP_KERNEL);
 233         if (!cf)
 234                 return -ENOMEM;
 235
 236         cf->board = board;
 237         cf->pdev = pdev;
 238         cf->phys_baseaddr = io->start;
 239         platform_set_drvdata(pdev, cf);
 240
 241         /* must be a GPIO; ergo must trigger on both edges */
 242         status = gpio_request(board->det_pin, "cf_det");
 243         if (status < 0)
 244                 goto fail0;
 245         status = request_irq(gpio_to_irq(board->det_pin), at91_cf_irq, 0, driver_name, cf);
 246         if (status < 0)
 247                 goto fail00;
 248         device_init_wakeup(&pdev->dev, 1);
 249
 250         status = gpio_request(board->rst_pin, "cf_rst");
 251         if (status < 0)
 252                 goto fail0a;
 253
 254         if (gpio_is_valid(board->vcc_pin)) {
 255                 status = gpio_request(board->vcc_pin, "cf_vcc");
 256                 if (status < 0)
 257                         goto fail0b;
 258         }
 259
 260         /*
 261          * The card driver will request this irq later as needed.
 262          * but it causes lots of "irqNN: nobody cared" messages
 263          * unless we report that we handle everything (sigh).
 264          * (Note:  DK board doesn't wire the IRQ pin...)
 265          */
 266         if (gpio_is_valid(board->irq_pin)) {
 267                 status = gpio_request(board->irq_pin, "cf_irq");
 268                 if (status < 0)
 269                         goto fail0c;
 270                 status = request_irq(gpio_to_irq(board->irq_pin), at91_cf_irq,
 271                                 IRQF_SHARED, driver_name, cf);
 272                 if (status < 0)
 273                         goto fail0d;
 274                 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
 275         } else
 276                 cf->socket.pci_irq = nr_irqs + 1;
 277
 278         /* pcmcia layer only remaps "real" memory not iospace */
 279         cf->socket.io_offset = (unsigned long)
 280                         ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
 281         if (!cf->socket.io_offset) {
 282                 status = -ENXIO;
 283                 goto fail1;
 284         }
 285
 286         /* reserve chip-select regions */
 287         if (!request_mem_region(io->start, resource_size(io), driver_name)) {
 288                 status = -ENXIO;
 289                 goto fail1;
 290         }
 291
 292         pr_info("%s: irqs det #%d, io #%d\n", driver_name,
 293                 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
 294
 295         cf->socket.owner = THIS_MODULE;
 296         cf->socket.dev.parent = &pdev->dev;
 297         cf->socket.ops = &at91_cf_ops;
 298         cf->socket.resource_ops = &pccard_static_ops;
 299         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 300                                 | SS_CAP_MEM_ALIGN;
 301         cf->socket.map_size = SZ_2K;
 302         cf->socket.io[0].res = io;
 303
 304         status = pcmcia_register_socket(&cf->socket);
 305         if (status < 0)
 306                 goto fail2;
 307
 308         return 0;
 309
 310 fail2:
 311         release_mem_region(io->start, resource_size(io));
 312 fail1:
 313         if (cf->socket.io_offset)
 314                 iounmap((void __iomem *) cf->socket.io_offset);
 315         if (gpio_is_valid(board->irq_pin)) {
 316                 free_irq(gpio_to_irq(board->irq_pin), cf);
 317 fail0d:
 318                 gpio_free(board->irq_pin);
 319         }
 320 fail0c:
 321         if (gpio_is_valid(board->vcc_pin))
 322                 gpio_free(board->vcc_pin);
 323 fail0b:
 324         gpio_free(board->rst_pin);
 325 fail0a:
 326         device_init_wakeup(&pdev->dev, 0);
 327         free_irq(gpio_to_irq(board->det_pin), cf);
 328 fail00:
 329         gpio_free(board->det_pin);
 330 fail0:
 331         kfree(cf);
 332         return status;
 333 }
 334
 335 static int __exit at91_cf_remove(struct platform_device *pdev)
 336 {
 337         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
 338         struct at91_cf_data     *board = cf->board;
 339         struct resource         *io = cf->socket.io[0].res;
 340
 341         pcmcia_unregister_socket(&cf->socket);
 342         release_mem_region(io->start, resource_size(io));
 343         iounmap((void __iomem *) cf->socket.io_offset);
 344         if (gpio_is_valid(board->irq_pin)) {
 345                 free_irq(gpio_to_irq(board->irq_pin), cf);
 346                 gpio_free(board->irq_pin);
 347         }
 348         if (gpio_is_valid(board->vcc_pin))
 349                 gpio_free(board->vcc_pin);
 350         gpio_free(board->rst_pin);
 351         device_init_wakeup(&pdev->dev, 0);
 352         free_irq(gpio_to_irq(board->det_pin), cf);
 353         gpio_free(board->det_pin);
 354         kfree(cf);
 355         return 0;
 356 }
 357
 358 #ifdef  CONFIG_PM
 359
 360 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
 361 {
 362         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
 363         struct at91_cf_data     *board = cf->board;
 364
 365         if (device_may_wakeup(&pdev->dev)) {
 366                 enable_irq_wake(gpio_to_irq(board->det_pin));
 367                 if (gpio_is_valid(board->irq_pin))
 368                         enable_irq_wake(gpio_to_irq(board->irq_pin));
 369         }
 370         return 0;
 371 }
 372
 373 static int at91_cf_resume(struct platform_device *pdev)
 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                 disable_irq_wake(gpio_to_irq(board->det_pin));
 380                 if (gpio_is_valid(board->irq_pin))
 381                         disable_irq_wake(gpio_to_irq(board->irq_pin));
 382         }
 383
 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         },
 397         .remove         = __exit_p(at91_cf_remove),
 398         .suspend        = at91_cf_suspend,
 399         .resume         = at91_cf_resume,
 400 };
 401
 402 /*--------------------------------------------------------------------------*/
 403
 404 static int __init at91_cf_init(void)
 405 {
 406         return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
 407 }
 408 module_init(at91_cf_init);
 409
 410 static void __exit at91_cf_exit(void)
 411 {
 412         platform_driver_unregister(&at91_cf_driver);
 413 }
 414 module_exit(at91_cf_exit);
 415
 416 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
 417 MODULE_AUTHOR("David Brownell");
 418 MODULE_LICENSE("GPL");
 419 MODULE_ALIAS("platform:at91_cf");