linux/drivers/pcmcia/at91_cf.c
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   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
  44static const char driver_name[] = "at91_cf";
  45
  46struct 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
  57static inline int at91_cf_present(struct at91_cf_socket *cf)
  58{
  59        return !gpio_get_value(cf->board->det_pin);
  60}
  61
  62/*--------------------------------------------------------------------------*/
  63
  64static int at91_cf_ss_init(struct pcmcia_socket *s)
  65{
  66        return 0;
  67}
  68
  69static 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
  88static 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
 113static int
 114at91_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
 143static 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 */
 149static 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 */
 188static int
 189at91_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
 207static 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
 218static 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
 310fail2:
 311        release_mem_region(io->start, resource_size(io));
 312fail1:
 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);
 317fail0d:
 318                gpio_free(board->irq_pin);
 319        }
 320fail0c:
 321        if (gpio_is_valid(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(gpio_to_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, 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
 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(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
 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(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
 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
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