linux/drivers/pcmcia/omap_cf.c
<<
>>
Prefs
   1/*
   2 * omap_cf.c -- OMAP 16xx 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/delay.h>
  18#include <linux/interrupt.h>
  19
  20#include <pcmcia/ss.h>
  21
  22#include <mach/hardware.h>
  23#include <asm/io.h>
  24#include <asm/sizes.h>
  25
  26#include <mach/mux.h>
  27#include <mach/tc.h>
  28
  29
  30/* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
  31 * hard-wired timings to support Compact Flash memory cards; they won't work
  32 * with various other devices (like WLAN adapters) without some external
  33 * logic to help out.
  34 *
  35 * NOTE:  CF controller docs disagree with address space docs as to where
  36 * CF_BASE really lives; this is a doc erratum.
  37 */
  38#define CF_BASE 0xfffe2800
  39
  40/* status; read after IRQ */
  41#define CF_STATUS                       (CF_BASE + 0x00)
  42#       define  CF_STATUS_BAD_READ      (1 << 2)
  43#       define  CF_STATUS_BAD_WRITE     (1 << 1)
  44#       define  CF_STATUS_CARD_DETECT   (1 << 0)
  45
  46/* which chipselect (CS0..CS3) is used for CF (active low) */
  47#define CF_CFG                          (CF_BASE + 0x02)
  48
  49/* card reset */
  50#define CF_CONTROL                      (CF_BASE + 0x04)
  51#       define  CF_CONTROL_RESET        (1 << 0)
  52
  53#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))
  54
  55/*--------------------------------------------------------------------------*/
  56
  57static const char driver_name[] = "omap_cf";
  58
  59struct omap_cf_socket {
  60        struct pcmcia_socket    socket;
  61
  62        struct timer_list       timer;
  63        unsigned                present:1;
  64        unsigned                active:1;
  65
  66        struct platform_device  *pdev;
  67        unsigned long           phys_cf;
  68        u_int                   irq;
  69        struct resource         iomem;
  70};
  71
  72#define POLL_INTERVAL           (2 * HZ)
  73
  74#define SZ_2K                   (2 * SZ_1K)
  75
  76/*--------------------------------------------------------------------------*/
  77
  78static int omap_cf_ss_init(struct pcmcia_socket *s)
  79{
  80        return 0;
  81}
  82
  83/* the timer is primarily to kick this socket's pccardd */
  84static void omap_cf_timer(unsigned long _cf)
  85{
  86        struct omap_cf_socket   *cf = (void *) _cf;
  87        unsigned                present = omap_cf_present();
  88
  89        if (present != cf->present) {
  90                cf->present = present;
  91                pr_debug("%s: card %s\n", driver_name,
  92                        present ? "present" : "gone");
  93                pcmcia_parse_events(&cf->socket, SS_DETECT);
  94        }
  95
  96        if (cf->active)
  97                mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
  98}
  99
 100/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
 101 * claim the card's IRQ.  It may also detect some card insertions, but
 102 * not removals; it can't always eliminate timer irqs.
 103 */
 104static irqreturn_t omap_cf_irq(int irq, void *_cf)
 105{
 106        omap_cf_timer((unsigned long)_cf);
 107        return IRQ_HANDLED;
 108}
 109
 110static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 111{
 112        if (!sp)
 113                return -EINVAL;
 114
 115        /* NOTE CF is always 3VCARD */
 116        if (omap_cf_present()) {
 117                struct omap_cf_socket   *cf;
 118
 119                *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 120                cf = container_of(s, struct omap_cf_socket, socket);
 121                s->irq.AssignedIRQ = 0;
 122                s->pci_irq = cf->irq;
 123        } else
 124                *sp = 0;
 125        return 0;
 126}
 127
 128static int
 129omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 130{
 131        u16             control;
 132
 133        /* REVISIT some non-OSK boards may support power switching */
 134        switch (s->Vcc) {
 135        case 0:
 136        case 33:
 137                break;
 138        default:
 139                return -EINVAL;
 140        }
 141
 142        control = omap_readw(CF_CONTROL);
 143        if (s->flags & SS_RESET)
 144                omap_writew(CF_CONTROL_RESET, CF_CONTROL);
 145        else
 146                omap_writew(0, CF_CONTROL);
 147
 148        pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 149                driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 150
 151        return 0;
 152}
 153
 154static int omap_cf_ss_suspend(struct pcmcia_socket *s)
 155{
 156        pr_debug("%s: %s\n", driver_name, __func__);
 157        return omap_cf_set_socket(s, &dead_socket);
 158}
 159
 160/* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
 161
 162static int
 163omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 164{
 165        struct omap_cf_socket   *cf;
 166
 167        cf = container_of(s, struct omap_cf_socket, socket);
 168        io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 169        io->start = cf->phys_cf + SZ_4K;
 170        io->stop = io->start + SZ_2K - 1;
 171        return 0;
 172}
 173
 174static int
 175omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 176{
 177        struct omap_cf_socket   *cf;
 178
 179        if (map->card_start)
 180                return -EINVAL;
 181        cf = container_of(s, struct omap_cf_socket, socket);
 182        map->static_start = cf->phys_cf;
 183        map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 184        if (map->flags & MAP_ATTRIB)
 185                map->static_start += SZ_2K;
 186        return 0;
 187}
 188
 189static struct pccard_operations omap_cf_ops = {
 190        .init                   = omap_cf_ss_init,
 191        .suspend                = omap_cf_ss_suspend,
 192        .get_status             = omap_cf_get_status,
 193        .set_socket             = omap_cf_set_socket,
 194        .set_io_map             = omap_cf_set_io_map,
 195        .set_mem_map            = omap_cf_set_mem_map,
 196};
 197
 198/*--------------------------------------------------------------------------*/
 199
 200/*
 201 * NOTE:  right now the only board-specific platform_data is
 202 * "what chipselect is used".  Boards could want more.
 203 */
 204
 205static int __init omap_cf_probe(struct platform_device *pdev)
 206{
 207        unsigned                seg;
 208        struct omap_cf_socket   *cf;
 209        int                     irq;
 210        int                     status;
 211
 212        seg = (int) pdev->dev.platform_data;
 213        if (seg == 0 || seg > 3)
 214                return -ENODEV;
 215
 216        /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
 217        irq = platform_get_irq(pdev, 0);
 218        if (irq < 0)
 219                return -EINVAL;
 220
 221        cf = kzalloc(sizeof *cf, GFP_KERNEL);
 222        if (!cf)
 223                return -ENOMEM;
 224        init_timer(&cf->timer);
 225        cf->timer.function = omap_cf_timer;
 226        cf->timer.data = (unsigned long) cf;
 227
 228        cf->pdev = pdev;
 229        platform_set_drvdata(pdev, cf);
 230
 231        /* this primarily just shuts up irq handling noise */
 232        status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
 233                        driver_name, cf);
 234        if (status < 0)
 235                goto fail0;
 236        cf->irq = irq;
 237        cf->socket.pci_irq = irq;
 238
 239        switch (seg) {
 240        /* NOTE: CS0 could be configured too ... */
 241        case 1:
 242                cf->phys_cf = OMAP_CS1_PHYS;
 243                break;
 244        case 2:
 245                cf->phys_cf = OMAP_CS2_PHYS;
 246                break;
 247        case 3:
 248                cf->phys_cf = omap_cs3_phys();
 249                break;
 250        default:
 251                goto  fail1;
 252        }
 253        cf->iomem.start = cf->phys_cf;
 254        cf->iomem.end = cf->iomem.end + SZ_8K - 1;
 255        cf->iomem.flags = IORESOURCE_MEM;
 256
 257        /* pcmcia layer only remaps "real" memory */
 258        cf->socket.io_offset = (unsigned long)
 259                        ioremap(cf->phys_cf + SZ_4K, SZ_2K);
 260        if (!cf->socket.io_offset)
 261                goto fail1;
 262
 263        if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
 264                goto fail1;
 265
 266        /* NOTE:  CF conflicts with MMC1 */
 267        omap_cfg_reg(W11_1610_CF_CD1);
 268        omap_cfg_reg(P11_1610_CF_CD2);
 269        omap_cfg_reg(R11_1610_CF_IOIS16);
 270        omap_cfg_reg(V10_1610_CF_IREQ);
 271        omap_cfg_reg(W10_1610_CF_RESET);
 272
 273        omap_writew(~(1 << seg), CF_CFG);
 274
 275        pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
 276
 277        /* NOTE:  better EMIFS setup might support more cards; but the
 278         * TRM only shows how to affect regular flash signals, not their
 279         * CF/PCMCIA variants...
 280         */
 281        pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
 282                seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
 283        omap_writel(0x0004a1b3, EMIFS_CCS(seg));        /* synch mode 4 etc */
 284        omap_writel(0x00000000, EMIFS_ACS(seg));        /* OE hold/setup */
 285
 286        /* CF uses armxor_ck, which is "always" available */
 287
 288        pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
 289                omap_readw(CF_STATUS), omap_readw(CF_CFG),
 290                omap_readw(CF_CONTROL),
 291                omap_cf_present() ? "present" : "(not present)");
 292
 293        cf->socket.owner = THIS_MODULE;
 294        cf->socket.dev.parent = &pdev->dev;
 295        cf->socket.ops = &omap_cf_ops;
 296        cf->socket.resource_ops = &pccard_static_ops;
 297        cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 298                                | SS_CAP_MEM_ALIGN;
 299        cf->socket.map_size = SZ_2K;
 300        cf->socket.io[0].res = &cf->iomem;
 301
 302        status = pcmcia_register_socket(&cf->socket);
 303        if (status < 0)
 304                goto fail2;
 305
 306        cf->active = 1;
 307        mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 308        return 0;
 309
 310fail2:
 311        release_mem_region(cf->phys_cf, SZ_8K);
 312fail1:
 313        if (cf->socket.io_offset)
 314                iounmap((void __iomem *) cf->socket.io_offset);
 315        free_irq(irq, cf);
 316fail0:
 317        kfree(cf);
 318        return status;
 319}
 320
 321static int __exit omap_cf_remove(struct platform_device *pdev)
 322{
 323        struct omap_cf_socket *cf = platform_get_drvdata(pdev);
 324
 325        cf->active = 0;
 326        pcmcia_unregister_socket(&cf->socket);
 327        del_timer_sync(&cf->timer);
 328        iounmap((void __iomem *) cf->socket.io_offset);
 329        release_mem_region(cf->phys_cf, SZ_8K);
 330        free_irq(cf->irq, cf);
 331        kfree(cf);
 332        return 0;
 333}
 334
 335static int omap_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
 336{
 337        return pcmcia_socket_dev_suspend(&pdev->dev, mesg);
 338}
 339
 340static int omap_cf_resume(struct platform_device *pdev)
 341{
 342        return pcmcia_socket_dev_resume(&pdev->dev);
 343}
 344
 345static struct platform_driver omap_cf_driver = {
 346        .driver = {
 347                .name   = (char *) driver_name,
 348                .owner  = THIS_MODULE,
 349        },
 350        .remove         = __exit_p(omap_cf_remove),
 351        .suspend        = omap_cf_suspend,
 352        .resume         = omap_cf_resume,
 353};
 354
 355static int __init omap_cf_init(void)
 356{
 357        if (cpu_is_omap16xx())
 358                return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
 359        return -ENODEV;
 360}
 361
 362static void __exit omap_cf_exit(void)
 363{
 364        if (cpu_is_omap16xx())
 365                platform_driver_unregister(&omap_cf_driver);
 366}
 367
 368module_init(omap_cf_init);
 369module_exit(omap_cf_exit);
 370
 371MODULE_DESCRIPTION("OMAP CF Driver");
 372MODULE_LICENSE("GPL");
 373MODULE_ALIAS("platform:omap_cf");
 374