bfin_cf_pcmcia.c

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/*
 * file: drivers/pcmcia/bfin_cf.c
 *
 * based on: drivers/pcmcia/omap_cf.c
 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
 *
 * Copyright (c) 2005 David Brownell
 * Copyright (c) 2006-2008 Michael Hennerich Analog Devices Inc.
 *
 * bugs:         enter bugs at http://blackfin.uclinux.org/
 *
 * this program is free software; you can redistribute it and/or modify
 * it under the terms of the gnu general public license as published by
 * the free software foundation; either version 2, or (at your option)
 * any later version.
 *
 * this program is distributed in the hope that it will be useful,
 * but without any warranty; without even the implied warranty of
 * merchantability or fitness for a particular purpose.  see the
 * gnu general public license for more details.
 *
 * you should have received a copy of the gnu general public license
 * along with this program; see the file copying.
 * if not, write to the free software foundation,
 * 59 temple place - suite 330, boston, ma 02111-1307, usa.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <pcmcia/ss.h>
#include <pcmcia/cisreg.h>
#include <asm/gpio.h>

#define SZ_1K   0x00000400
#define SZ_8K   0x00002000
#define SZ_2K   (2 * SZ_1K)

#define POLL_INTERVAL   (2 * HZ)

#define CF_ATASEL_ENA   0x20311802  /* Inverts RESET */
#define CF_ATASEL_DIS   0x20311800

#define bfin_cf_present(pfx) (gpio_get_value(pfx))

/*--------------------------------------------------------------------------*/

static const char driver_name[] = "bfin_cf_pcmcia";

struct bfin_cf_socket {
    struct pcmcia_socket socket;

    struct timer_list timer;
    unsigned present:1;
    unsigned active:1;

    struct platform_device *pdev;
    unsigned long phys_cf_io;
    unsigned long phys_cf_attr;
    u_int irq;
    u_short cd_pfx;
};

/*--------------------------------------------------------------------------*/
static int bfin_cf_reset(void)
{
    outw(0, CF_ATASEL_ENA);
    mdelay(200);
    outw(0, CF_ATASEL_DIS);

    return 0;
}

static int bfin_cf_ss_init(struct pcmcia_socket *s)
{
    return 0;
}

/* the timer is primarily to kick this socket's pccardd */
static void bfin_cf_timer(unsigned long _cf)
{
    struct bfin_cf_socket *cf = (void *)_cf;
    unsigned short present = bfin_cf_present(cf->cd_pfx);

    if (present != cf->present) {
        cf->present = present;
        dev_dbg(&cf->pdev->dev, ": card %s\n",
             present ? "present" : "gone");
        pcmcia_parse_events(&cf->socket, SS_DETECT);
    }

    if (cf->active)
        mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
}

static int bfin_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
    struct bfin_cf_socket *cf;

    if (!sp)
        return -EINVAL;

    cf = container_of(s, struct bfin_cf_socket, socket);

    if (bfin_cf_present(cf->cd_pfx)) {
        *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
        s->pcmcia_irq = 0;
        s->pci_irq = cf->irq;

    } else
        *sp = 0;
    return 0;
}

static int
bfin_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
{

    struct bfin_cf_socket *cf;
    cf = container_of(sock, struct bfin_cf_socket, socket);

    switch (s->Vcc) {
    case 0:
    case 33:
        break;
    case 50:
        break;
    default:
        return -EINVAL;
    }

    if (s->flags & SS_RESET) {
        disable_irq(cf->irq);
        bfin_cf_reset();
        enable_irq(cf->irq);
    }

    dev_dbg(&cf->pdev->dev, ": Vcc %d, io_irq %d, flags %04x csc %04x\n",
         s->Vcc, s->io_irq, s->flags, s->csc_mask);

    return 0;
}

static int bfin_cf_ss_suspend(struct pcmcia_socket *s)
{
    return bfin_cf_set_socket(s, &dead_socket);
}

/* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */

static int bfin_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
    struct bfin_cf_socket *cf;

    cf = container_of(s, struct bfin_cf_socket, socket);
    io->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
    io->start = cf->phys_cf_io;
    io->stop = io->start + SZ_2K - 1;
    return 0;
}

static int
bfin_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
{
    struct bfin_cf_socket *cf;

    if (map->card_start)
        return -EINVAL;
    cf = container_of(s, struct bfin_cf_socket, socket);
    map->static_start = cf->phys_cf_io;
    map->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
    if (map->flags & MAP_ATTRIB)
        map->static_start = cf->phys_cf_attr;

    return 0;
}

static struct pccard_operations bfin_cf_ops = {
    .init = bfin_cf_ss_init,
    .suspend = bfin_cf_ss_suspend,
    .get_status = bfin_cf_get_status,
    .set_socket = bfin_cf_set_socket,
    .set_io_map = bfin_cf_set_io_map,
    .set_mem_map = bfin_cf_set_mem_map,
};

/*--------------------------------------------------------------------------*/

static int __devinit bfin_cf_probe(struct platform_device *pdev)
{
    struct bfin_cf_socket *cf;
    struct resource *io_mem, *attr_mem;
    int irq;
    unsigned short cd_pfx;
    int status = 0;

    dev_info(&pdev->dev, "Blackfin CompactFlash/PCMCIA Socket Driver\n");

    irq = platform_get_irq(pdev, 0);
    if (irq <= 0)
        return -EINVAL;

    cd_pfx = platform_get_irq(pdev, 1); /*Card Detect GPIO PIN */

    if (gpio_request(cd_pfx, "pcmcia: CD")) {
        dev_err(&pdev->dev,
               "Failed ro request Card Detect GPIO_%d\n",
               cd_pfx);
        return -EBUSY;
    }
    gpio_direction_input(cd_pfx);

    cf = kzalloc(sizeof *cf, GFP_KERNEL);
    if (!cf) {
        gpio_free(cd_pfx);
        return -ENOMEM;
    }

    cf->cd_pfx = cd_pfx;

    setup_timer(&cf->timer, bfin_cf_timer, (unsigned long)cf);

    cf->pdev = pdev;
    platform_set_drvdata(pdev, cf);

    cf->irq = irq;
    cf->socket.pci_irq = irq;

    irq_set_irq_type(irq, IRQF_TRIGGER_LOW);

    io_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    attr_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);

    if (!io_mem || !attr_mem)
        goto fail0;

    cf->phys_cf_io = io_mem->start;
    cf->phys_cf_attr = attr_mem->start;

    /* pcmcia layer only remaps "real" memory */
    cf->socket.io_offset = (unsigned long)
        ioremap(cf->phys_cf_io, SZ_2K);

    if (!cf->socket.io_offset)
        goto fail0;

    dev_err(&pdev->dev, ": on irq %d\n", irq);

    dev_dbg(&pdev->dev, ": %s\n",
         bfin_cf_present(cf->cd_pfx) ? "present" : "(not present)");

    cf->socket.owner = THIS_MODULE;
    cf->socket.dev.parent = &pdev->dev;
    cf->socket.ops = &bfin_cf_ops;
    cf->socket.resource_ops = &pccard_static_ops;
    cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
        | SS_CAP_MEM_ALIGN;
    cf->socket.map_size = SZ_2K;

    status = pcmcia_register_socket(&cf->socket);
    if (status < 0)
        goto fail2;

    cf->active = 1;
    mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
    return 0;

fail2:
    iounmap((void __iomem *)cf->socket.io_offset);
    release_mem_region(cf->phys_cf_io, SZ_8K);

fail0:
    gpio_free(cf->cd_pfx);
    kfree(cf);
    platform_set_drvdata(pdev, NULL);

    return status;
}

static int __devexit bfin_cf_remove(struct platform_device *pdev)
{
    struct bfin_cf_socket *cf = platform_get_drvdata(pdev);

    gpio_free(cf->cd_pfx);
    cf->active = 0;
    pcmcia_unregister_socket(&cf->socket);
    del_timer_sync(&cf->timer);
    iounmap((void __iomem *)cf->socket.io_offset);
    release_mem_region(cf->phys_cf_io, SZ_8K);
    platform_set_drvdata(pdev, NULL);
    kfree(cf);
    return 0;
}

static struct platform_driver bfin_cf_driver = {
    .driver = {
           .name = (char *)driver_name,
           .owner = THIS_MODULE,
           },
    .probe = bfin_cf_probe,
    .remove = __devexit_p(bfin_cf_remove),
};

module_platform_driver(bfin_cf_driver);

MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
MODULE_LICENSE("GPL");