electra_cf.c

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/*
 * Copyright (C) 2007 PA Semi, Inc
 *
 * Maintained by: Olof Johansson <[email protected]>
 *
 * Based on drivers/pcmcia/omap_cf.c
 *
 * 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 of the License, 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; if not, write to the Free Software
 * Foundation, Inc., 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/delay.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/of_platform.h>
#include <linux/slab.h>

#include <pcmcia/ss.h>

static const char driver_name[] = "electra-cf";

struct electra_cf_socket {
    struct pcmcia_socket    socket;

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

    struct platform_device  *ofdev;
    unsigned long       mem_phys;
    void __iomem *      mem_base;
    unsigned long       mem_size;
    void __iomem *      io_virt;
    unsigned int        io_base;
    unsigned int        io_size;
    u_int           irq;
    struct resource     iomem;
    void __iomem *      gpio_base;
    int         gpio_detect;
    int         gpio_vsense;
    int         gpio_3v;
    int         gpio_5v;
};

#define POLL_INTERVAL       (2 * HZ)


static int electra_cf_present(struct electra_cf_socket *cf)
{
    unsigned int gpio;

    gpio = in_le32(cf->gpio_base+0x40);
    return !(gpio & (1 << cf->gpio_detect));
}

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

/* the timer is primarily to kick this socket's pccardd */
static void electra_cf_timer(unsigned long _cf)
{
    struct electra_cf_socket *cf = (void *) _cf;
    int present = electra_cf_present(cf);

    if (present != cf->present) {
        cf->present = present;
        pcmcia_parse_events(&cf->socket, SS_DETECT);
    }

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

static irqreturn_t electra_cf_irq(int irq, void *_cf)
{
    electra_cf_timer((unsigned long)_cf);
    return IRQ_HANDLED;
}

static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
    struct electra_cf_socket *cf;

    if (!sp)
        return -EINVAL;

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

    /* NOTE CF is always 3VCARD */
    if (electra_cf_present(cf)) {
        *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;

        s->pci_irq = cf->irq;
    } else
        *sp = 0;
    return 0;
}

static int electra_cf_set_socket(struct pcmcia_socket *sock,
                 struct socket_state_t *s)
{
    unsigned int gpio;
    unsigned int vcc;
    struct electra_cf_socket *cf;

    cf = container_of(sock, struct electra_cf_socket, socket);

    /* "reset" means no power in our case */
    vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;

    switch (vcc) {
    case 0:
        gpio = 0;
        break;
    case 33:
        gpio = (1 << cf->gpio_3v);
        break;
    case 5:
        gpio = (1 << cf->gpio_5v);
        break;
    default:
        return -EINVAL;
    }

    gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
    gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
    out_le32(cf->gpio_base+0x90, gpio);

    pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
        driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);

    return 0;
}

static int electra_cf_set_io_map(struct pcmcia_socket *s,
                 struct pccard_io_map *io)
{
    return 0;
}

static int electra_cf_set_mem_map(struct pcmcia_socket *s,
                  struct pccard_mem_map *map)
{
    struct electra_cf_socket *cf;

    if (map->card_start)
        return -EINVAL;
    cf = container_of(s, struct electra_cf_socket, socket);
    map->static_start = cf->mem_phys;
    map->flags &= MAP_ACTIVE|MAP_ATTRIB;
    if (!(map->flags & MAP_ATTRIB))
        map->static_start += 0x800;
    return 0;
}

static struct pccard_operations electra_cf_ops = {
    .init           = electra_cf_ss_init,
    .get_status     = electra_cf_get_status,
    .set_socket     = electra_cf_set_socket,
    .set_io_map     = electra_cf_set_io_map,
    .set_mem_map        = electra_cf_set_mem_map,
};

static int __devinit electra_cf_probe(struct platform_device *ofdev)
{
    struct device *device = &ofdev->dev;
    struct device_node *np = ofdev->dev.of_node;
    struct electra_cf_socket   *cf;
    struct resource mem, io;
    int status;
    const unsigned int *prop;
    int err;
    struct vm_struct *area;

    err = of_address_to_resource(np, 0, &mem);
    if (err)
        return -EINVAL;

    err = of_address_to_resource(np, 1, &io);
    if (err)
        return -EINVAL;

    cf = kzalloc(sizeof *cf, GFP_KERNEL);
    if (!cf)
        return -ENOMEM;

    setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
    cf->irq = NO_IRQ;

    cf->ofdev = ofdev;
    cf->mem_phys = mem.start;
    cf->mem_size = PAGE_ALIGN(resource_size(&mem));
    cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
    cf->io_size = PAGE_ALIGN(resource_size(&io));

    area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
    if (area == NULL)
        return -ENOMEM;

    cf->io_virt = (void __iomem *)(area->addr);

    cf->gpio_base = ioremap(0xfc103000, 0x1000);
    dev_set_drvdata(device, cf);

    if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
        (__ioremap_at(io.start, cf->io_virt, cf->io_size,
        _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)) {
        dev_err(device, "can't ioremap ranges\n");
        status = -ENOMEM;
        goto fail1;
    }


    cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;

    cf->iomem.start = (unsigned long)cf->mem_base;
    cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
    cf->iomem.flags = IORESOURCE_MEM;

    cf->irq = irq_of_parse_and_map(np, 0);

    status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
                 driver_name, cf);
    if (status < 0) {
        dev_err(device, "request_irq failed\n");
        goto fail1;
    }

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

    prop = of_get_property(np, "card-detect-gpio", NULL);
    if (!prop)
        goto fail1;
    cf->gpio_detect = *prop;

    prop = of_get_property(np, "card-vsense-gpio", NULL);
    if (!prop)
        goto fail1;
    cf->gpio_vsense = *prop;

    prop = of_get_property(np, "card-3v-gpio", NULL);
    if (!prop)
        goto fail1;
    cf->gpio_3v = *prop;

    prop = of_get_property(np, "card-5v-gpio", NULL);
    if (!prop)
        goto fail1;
    cf->gpio_5v = *prop;

    cf->socket.io_offset = cf->io_base;

    /* reserve chip-select regions */
    if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
        status = -ENXIO;
        dev_err(device, "Can't claim memory region\n");
        goto fail1;
    }

    if (!request_region(cf->io_base, cf->io_size, driver_name)) {
        status = -ENXIO;
        dev_err(device, "Can't claim I/O region\n");
        goto fail2;
    }

    cf->socket.owner = THIS_MODULE;
    cf->socket.dev.parent = &ofdev->dev;
    cf->socket.ops = &electra_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 = 0x800;

    status = pcmcia_register_socket(&cf->socket);
    if (status < 0) {
        dev_err(device, "pcmcia_register_socket failed\n");
        goto fail3;
    }

    dev_info(device, "at mem 0x%lx io 0x%llx irq %d\n",
         cf->mem_phys, io.start, cf->irq);

    cf->active = 1;
    electra_cf_timer((unsigned long)cf);
    return 0;

fail3:
    release_region(cf->io_base, cf->io_size);
fail2:
    release_mem_region(cf->mem_phys, cf->mem_size);
fail1:
    if (cf->irq != NO_IRQ)
        free_irq(cf->irq, cf);

    if (cf->io_virt)
        __iounmap_at(cf->io_virt, cf->io_size);
    if (cf->mem_base)
        iounmap(cf->mem_base);
    if (cf->gpio_base)
        iounmap(cf->gpio_base);
    device_init_wakeup(&ofdev->dev, 0);
    kfree(cf);
    return status;

}

static int __devexit electra_cf_remove(struct platform_device *ofdev)
{
    struct device *device = &ofdev->dev;
    struct electra_cf_socket *cf;

    cf = dev_get_drvdata(device);

    cf->active = 0;
    pcmcia_unregister_socket(&cf->socket);
    free_irq(cf->irq, cf);
    del_timer_sync(&cf->timer);

    __iounmap_at(cf->io_virt, cf->io_size);
    iounmap(cf->mem_base);
    iounmap(cf->gpio_base);
    release_mem_region(cf->mem_phys, cf->mem_size);
    release_region(cf->io_base, cf->io_size);

    kfree(cf);

    return 0;
}

static const struct of_device_id electra_cf_match[] = {
    {
        .compatible   = "electra-cf",
    },
    {},
};
MODULE_DEVICE_TABLE(of, electra_cf_match);

static struct platform_driver electra_cf_driver = {
    .driver = {
        .name = (char *)driver_name,
        .owner = THIS_MODULE,
        .of_match_table = electra_cf_match,
    },
    .probe    = electra_cf_probe,
    .remove   = electra_cf_remove,
};

module_platform_driver(electra_cf_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Olof Johansson <[email protected]>");
MODULE_DESCRIPTION("PA Semi Electra CF driver");