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");