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/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/board.h>
  27 #include <asm/arch/gpio.h>
  28 #include <asm/arch/at91rm9200_mc.h>
  29
  30
  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  * Note: These are offsets from the physical base address.
  36  */
  37 #define CF_ATTR_PHYS    (0)
  38 #define CF_IO_PHYS      (1 << 23)
  39 #define CF_MEM_PHYS     (0x017ff800)
  40
  41 /*--------------------------------------------------------------------------*/
  42
  43 static const char driver_name[] = "at91_cf";
  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 #define SZ_2K                   (2 * SZ_1K)
  57
  58 static inline int at91_cf_present(struct at91_cf_socket *cf)
  59 {
  60         return !at91_get_gpio_value(cf->board->det_pin);
  61 }
  62
  63 /*--------------------------------------------------------------------------*/
  64
  65 static int at91_cf_ss_init(struct pcmcia_socket *s)
  66 {
  67         return 0;
  68 }
  69
  70 static irqreturn_t at91_cf_irq(int irq, void *_cf)
  71 {
  72         struct at91_cf_socket *cf = _cf;
  73
  74         if (irq == cf->board->det_pin) {
  75                 unsigned present = at91_cf_present(cf);
  76
  77                 /* kick pccard as needed */
  78                 if (present != cf->present) {
  79                         cf->present = present;
  80                         pr_debug("%s: card %s\n", driver_name,
  81                                         present ? "present" : "gone");
  82                         pcmcia_parse_events(&cf->socket, SS_DETECT);
  83                 }
  84         }
  85
  86         return IRQ_HANDLED;
  87 }
  88
  89 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
  90 {
  91         struct at91_cf_socket   *cf;
  92
  93         if (!sp)
  94                 return -EINVAL;
  95
  96         cf = container_of(s, struct at91_cf_socket, socket);
  97
  98         /* NOTE: CF is always 3VCARD */
  99         if (at91_cf_present(cf)) {
 100                 int rdy = cf->board->irq_pin;   /* RDY/nIRQ */
 101                 int vcc = cf->board->vcc_pin;
 102
 103                 *sp = SS_DETECT | SS_3VCARD;
 104                 if (!rdy || at91_get_gpio_value(rdy))
 105                         *sp |= SS_READY;
 106                 if (!vcc || at91_get_gpio_value(vcc))
 107                         *sp |= SS_POWERON;
 108         } else
 109                 *sp = 0;
 110
 111         return 0;
 112 }
 113
 114 static int
 115 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 116 {
 117         struct at91_cf_socket   *cf;
 118
 119         cf = container_of(sock, struct at91_cf_socket, socket);
 120
 121         /* switch Vcc if needed and possible */
 122         if (cf->board->vcc_pin) {
 123                 switch (s->Vcc) {
 124                         case 0:
 125                                 at91_set_gpio_value(cf->board->vcc_pin, 0);
 126                                 break;
 127                         case 33:
 128                                 at91_set_gpio_value(cf->board->vcc_pin, 1);
 129                                 break;
 130                         default:
 131                                 return -EINVAL;
 132                 }
 133         }
 134
 135         /* toggle reset if needed */
 136         at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET);
 137
 138         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 139                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 140
 141         return 0;
 142 }
 143
 144 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
 145 {
 146         return at91_cf_set_socket(s, &dead_socket);
 147 }
 148
 149 /* we already mapped the I/O region */
 150 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 151 {
 152         struct at91_cf_socket   *cf;
 153         u32                     csr;
 154
 155         cf = container_of(s, struct at91_cf_socket, socket);
 156         io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
 157
 158         /*
 159          * Use 16 bit accesses unless/until we need 8-bit i/o space.
 160          */
 161         csr = at91_sys_read(AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
 162
 163         /*
 164          * NOTE: this CF controller ignores IOIS16, so we can't really do
 165          * MAP_AUTOSZ.  The 16bit mode allows single byte access on either
 166          * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
 167          * purposes (and handles ide-cs).
 168          *
 169          * The 8bit mode is needed for odd byte access on D0-D7.  It seems
 170          * some cards only like that way to get at the odd byte, despite
 171          * CF 3.0 spec table 35 also giving the D8-D15 option.
 172          */
 173         if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
 174                 csr |= AT91_SMC_DBW_8;
 175                 pr_debug("%s: 8bit i/o bus\n", driver_name);
 176         } else {
 177                 csr |= AT91_SMC_DBW_16;
 178                 pr_debug("%s: 16bit i/o bus\n", driver_name);
 179         }
 180         at91_sys_write(AT91_SMC_CSR(cf->board->chipselect), csr);
 181
 182         io->start = cf->socket.io_offset;
 183         io->stop = io->start + SZ_2K - 1;
 184
 185         return 0;
 186 }
 187
 188 /* pcmcia layer maps/unmaps mem regions */
 189 static int
 190 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 191 {
 192         struct at91_cf_socket   *cf;
 193
 194         if (map->card_start)
 195                 return -EINVAL;
 196
 197         cf = container_of(s, struct at91_cf_socket, socket);
 198
 199         map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
 200         if (map->flags & MAP_ATTRIB)
 201                 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
 202         else
 203                 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
 204
 205         return 0;
 206 }
 207
 208 static struct pccard_operations at91_cf_ops = {
 209         .init                   = at91_cf_ss_init,
 210         .suspend                = at91_cf_ss_suspend,
 211         .get_status             = at91_cf_get_status,
 212         .set_socket             = at91_cf_set_socket,
 213         .set_io_map             = at91_cf_set_io_map,
 214         .set_mem_map            = at91_cf_set_mem_map,
 215 };
 216
 217 /*--------------------------------------------------------------------------*/
 218
 219 static int __init at91_cf_probe(struct platform_device *pdev)
 220 {
 221         struct at91_cf_socket   *cf;
 222         struct at91_cf_data     *board = pdev->dev.platform_data;
 223         struct resource         *io;
 224         int                     status;
 225
 226         if (!board || !board->det_pin || !board->rst_pin)
 227                 return -ENODEV;
 228
 229         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 230         if (!io)
 231                 return -ENODEV;
 232
 233         cf = kzalloc(sizeof *cf, GFP_KERNEL);
 234         if (!cf)
 235                 return -ENOMEM;
 236
 237         cf->board = board;
 238         cf->pdev = pdev;
 239         cf->phys_baseaddr = io->start;
 240         platform_set_drvdata(pdev, cf);
 241
 242         /* must be a GPIO; ergo must trigger on both edges */
 243         status = request_irq(board->det_pin, at91_cf_irq, 0, driver_name, cf);
 244         if (status < 0)
 245                 goto fail0;
 246         device_init_wakeup(&pdev->dev, 1);
 247
 248         /*
 249          * The card driver will request this irq later as needed.
 250          * but it causes lots of "irqNN: nobody cared" messages
 251          * unless we report that we handle everything (sigh).
 252          * (Note:  DK board doesn't wire the IRQ pin...)
 253          */
 254         if (board->irq_pin) {
 255                 status = request_irq(board->irq_pin, at91_cf_irq,
 256                                 IRQF_SHARED, driver_name, cf);
 257                 if (status < 0)
 258                         goto fail0a;
 259                 cf->socket.pci_irq = board->irq_pin;
 260         } else
 261                 cf->socket.pci_irq = NR_IRQS + 1;
 262
 263         /* pcmcia layer only remaps "real" memory not iospace */
 264         cf->socket.io_offset = (unsigned long) ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
 265         if (!cf->socket.io_offset) {
 266                 status = -ENXIO;
 267                 goto fail1;
 268         }
 269
 270         /* reserve chip-select regions */
 271         if (!request_mem_region(io->start, io->end + 1 - io->start,
 272                                 driver_name)) {
 273                 status = -ENXIO;
 274                 goto fail1;
 275         }
 276
 277         pr_info("%s: irqs det #%d, io #%d\n", driver_name,
 278                 board->det_pin, board->irq_pin);
 279
 280         cf->socket.owner = THIS_MODULE;
 281         cf->socket.dev.dev = &pdev->dev;
 282         cf->socket.ops = &at91_cf_ops;
 283         cf->socket.resource_ops = &pccard_static_ops;
 284         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 285                                 | SS_CAP_MEM_ALIGN;
 286         cf->socket.map_size = SZ_2K;
 287         cf->socket.io[0].res = io;
 288
 289         status = pcmcia_register_socket(&cf->socket);
 290         if (status < 0)
 291                 goto fail2;
 292
 293         return 0;
 294
 295 fail2:
 296         release_mem_region(io->start, io->end + 1 - io->start);
 297 fail1:
 298         if (cf->socket.io_offset)
 299                 iounmap((void __iomem *) cf->socket.io_offset);
 300         if (board->irq_pin)
 301                 free_irq(board->irq_pin, cf);
 302 fail0a:
 303         device_init_wakeup(&pdev->dev, 0);
 304         free_irq(board->det_pin, cf);
 305 fail0:
 306         kfree(cf);
 307         return status;
 308 }
 309
 310 static int __exit at91_cf_remove(struct platform_device *pdev)
 311 {
 312         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
 313         struct at91_cf_data     *board = cf->board;
 314         struct resource         *io = cf->socket.io[0].res;
 315
 316         pcmcia_unregister_socket(&cf->socket);
 317         if (board->irq_pin)
 318                 free_irq(board->irq_pin, cf);
 319         device_init_wakeup(&pdev->dev, 0);
 320         free_irq(board->det_pin, cf);
 321         iounmap((void __iomem *) cf->socket.io_offset);
 322         release_mem_region(io->start, io->end + 1 - io->start);
 323
 324         kfree(cf);
 325         return 0;
 326 }
 327
 328 #ifdef  CONFIG_PM
 329
 330 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
 331 {
 332         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
 333         struct at91_cf_data     *board = cf->board;
 334
 335         pcmcia_socket_dev_suspend(&pdev->dev, mesg);
 336         if (device_may_wakeup(&pdev->dev)) {
 337                 enable_irq_wake(board->det_pin);
 338                 if (board->irq_pin)
 339                         enable_irq_wake(board->irq_pin);
 340         } else {
 341                 disable_irq_wake(board->det_pin);
 342                 if (board->irq_pin)
 343                         disable_irq_wake(board->irq_pin);
 344         }
 345         return 0;
 346 }
 347
 348 static int at91_cf_resume(struct platform_device *pdev)
 349 {
 350         pcmcia_socket_dev_resume(&pdev->dev);
 351         return 0;
 352 }
 353
 354 #else
 355 #define at91_cf_suspend         NULL
 356 #define at91_cf_resume          NULL
 357 #endif
 358
 359 static struct platform_driver at91_cf_driver = {
 360         .driver = {
 361                 .name           = (char *) driver_name,
 362                 .owner          = THIS_MODULE,
 363         },
 364         .probe          = at91_cf_probe,
 365         .remove         = __exit_p(at91_cf_remove),
 366         .suspend        = at91_cf_suspend,
 367         .resume         = at91_cf_resume,
 368 };
 369
 370 /*--------------------------------------------------------------------------*/
 371
 372 static int __init at91_cf_init(void)
 373 {
 374         return platform_driver_register(&at91_cf_driver);
 375 }
 376 module_init(at91_cf_init);
 377
 378 static void __exit at91_cf_exit(void)
 379 {
 380         platform_driver_unregister(&at91_cf_driver);
 381 }
 382 module_exit(at91_cf_exit);
 383
 384 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
 385 MODULE_AUTHOR("David Brownell");
 386 MODULE_LICENSE("GPL");