linux/drivers/pcmcia/at91_cf.c
<<
>>
Prefs
   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
  20#include <pcmcia/ss.h>
  21
  22#include <mach/hardware.h>
  23#include <asm/io.h>
  24#include <asm/sizes.h>
  25#include <asm/gpio.h>
  26
  27#include <mach/board.h>
  28#include <mach/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
  43static const char driver_name[] = "at91_cf";
  44
  45struct 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
  56static inline int at91_cf_present(struct at91_cf_socket *cf)
  57{
  58        return !gpio_get_value(cf->board->det_pin);
  59}
  60
  61/*--------------------------------------------------------------------------*/
  62
  63static int at91_cf_ss_init(struct pcmcia_socket *s)
  64{
  65        return 0;
  66}
  67
  68static irqreturn_t at91_cf_irq(int irq, void *_cf)
  69{
  70        struct at91_cf_socket *cf = _cf;
  71
  72        if (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                        pr_debug("%s: card %s\n", driver_name,
  79                                        present ? "present" : "gone");
  80                        pcmcia_parse_events(&cf->socket, SS_DETECT);
  81                }
  82        }
  83
  84        return IRQ_HANDLED;
  85}
  86
  87static 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 = cf->board->irq_pin;   /* RDY/nIRQ */
  99                int vcc = cf->board->vcc_pin;
 100
 101                *sp = SS_DETECT | SS_3VCARD;
 102                if (!rdy || gpio_get_value(rdy))
 103                        *sp |= SS_READY;
 104                if (!vcc || gpio_get_value(vcc))
 105                        *sp |= SS_POWERON;
 106        } else
 107                *sp = 0;
 108
 109        return 0;
 110}
 111
 112static int
 113at91_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 (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        pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 137                driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 138
 139        return 0;
 140}
 141
 142static 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 */
 148static 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_sys_read(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                pr_debug("%s: 8bit i/o bus\n", driver_name);
 174        } else {
 175                csr |= AT91_SMC_DBW_16;
 176                pr_debug("%s: 16bit i/o bus\n", driver_name);
 177        }
 178        at91_sys_write(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 */
 187static int
 188at91_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
 206static 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
 217static int __init at91_cf_probe(struct platform_device *pdev)
 218{
 219        struct at91_cf_socket   *cf;
 220        struct at91_cf_data     *board = pdev->dev.platform_data;
 221        struct resource         *io;
 222        int                     status;
 223
 224        if (!board || !board->det_pin || !board->rst_pin)
 225                return -ENODEV;
 226
 227        io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 228        if (!io)
 229                return -ENODEV;
 230
 231        cf = kzalloc(sizeof *cf, GFP_KERNEL);
 232        if (!cf)
 233                return -ENOMEM;
 234
 235        cf->board = board;
 236        cf->pdev = pdev;
 237        cf->phys_baseaddr = io->start;
 238        platform_set_drvdata(pdev, cf);
 239
 240        /* must be a GPIO; ergo must trigger on both edges */
 241        status = gpio_request(board->det_pin, "cf_det");
 242        if (status < 0)
 243                goto fail0;
 244        status = request_irq(board->det_pin, at91_cf_irq, 0, driver_name, cf);
 245        if (status < 0)
 246                goto fail00;
 247        device_init_wakeup(&pdev->dev, 1);
 248
 249        status = gpio_request(board->rst_pin, "cf_rst");
 250        if (status < 0)
 251                goto fail0a;
 252
 253        if (board->vcc_pin) {
 254                status = gpio_request(board->vcc_pin, "cf_vcc");
 255                if (status < 0)
 256                        goto fail0b;
 257        }
 258
 259        /*
 260         * The card driver will request this irq later as needed.
 261         * but it causes lots of "irqNN: nobody cared" messages
 262         * unless we report that we handle everything (sigh).
 263         * (Note:  DK board doesn't wire the IRQ pin...)
 264         */
 265        if (board->irq_pin) {
 266                status = gpio_request(board->irq_pin, "cf_irq");
 267                if (status < 0)
 268                        goto fail0c;
 269                status = request_irq(board->irq_pin, at91_cf_irq,
 270                                IRQF_SHARED, driver_name, cf);
 271                if (status < 0)
 272                        goto fail0d;
 273                cf->socket.pci_irq = board->irq_pin;
 274        } else
 275                cf->socket.pci_irq = nr_irqs + 1;
 276
 277        /* pcmcia layer only remaps "real" memory not iospace */
 278        cf->socket.io_offset = (unsigned long)
 279                        ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
 280        if (!cf->socket.io_offset) {
 281                status = -ENXIO;
 282                goto fail1;
 283        }
 284
 285        /* reserve chip-select regions */
 286        if (!request_mem_region(io->start, io->end + 1 - io->start,
 287                                driver_name)) {
 288                status = -ENXIO;
 289                goto fail1;
 290        }
 291
 292        pr_info("%s: irqs det #%d, io #%d\n", driver_name,
 293                board->det_pin, 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
 310fail2:
 311        release_mem_region(io->start, io->end + 1 - io->start);
 312fail1:
 313        if (cf->socket.io_offset)
 314                iounmap((void __iomem *) cf->socket.io_offset);
 315        if (board->irq_pin) {
 316                free_irq(board->irq_pin, cf);
 317fail0d:
 318                gpio_free(board->irq_pin);
 319        }
 320fail0c:
 321        if (board->vcc_pin)
 322                gpio_free(board->vcc_pin);
 323fail0b:
 324        gpio_free(board->rst_pin);
 325fail0a:
 326        device_init_wakeup(&pdev->dev, 0);
 327        free_irq(board->det_pin, cf);
 328fail00:
 329        gpio_free(board->det_pin);
 330fail0:
 331        kfree(cf);
 332        return status;
 333}
 334
 335static 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, io->end + 1 - io->start);
 343        iounmap((void __iomem *) cf->socket.io_offset);
 344        if (board->irq_pin) {
 345                free_irq(board->irq_pin, cf);
 346                gpio_free(board->irq_pin);
 347        }
 348        if (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(board->det_pin, cf);
 353        gpio_free(board->det_pin);
 354        kfree(cf);
 355        return 0;
 356}
 357
 358#ifdef  CONFIG_PM
 359
 360static 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(board->det_pin);
 367                if (board->irq_pin)
 368                        enable_irq_wake(board->irq_pin);
 369        }
 370        return 0;
 371}
 372
 373static 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(board->det_pin);
 380                if (board->irq_pin)
 381                        disable_irq_wake(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
 392static 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
 404static int __init at91_cf_init(void)
 405{
 406        return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
 407}
 408module_init(at91_cf_init);
 409
 410static void __exit at91_cf_exit(void)
 411{
 412        platform_driver_unregister(&at91_cf_driver);
 413}
 414module_exit(at91_cf_exit);
 415
 416MODULE_DESCRIPTION("AT91 Compact Flash Driver");
 417MODULE_AUTHOR("David Brownell");
 418MODULE_LICENSE("GPL");
 419MODULE_ALIAS("platform:at91_cf");
 420