xxs1500_ss.c

Go to the documentation of this file.

/*
 * PCMCIA socket code for the MyCable XXS1500 system.
 *
 * Copyright (c) 2009 Manuel Lauss <[email protected]>
 *
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/resource.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <pcmcia/ss.h>
#include <pcmcia/cistpl.h>

#include <asm/irq.h>
#include <asm/mach-au1x00/au1000.h>

#define MEM_MAP_SIZE    0x400000
#define IO_MAP_SIZE 0x1000


/*
 * 3.3V cards only; all interfacing is done via gpios:
 *
 * 0/1:  carddetect (00 = card present, xx = huh)
 * 4:    card irq
 * 204:  reset (high-act)
 * 205:  buffer enable (low-act)
 * 208/209: card voltage key (00,01,10,11)
 * 210:  battwarn
 * 211:  batdead
 * 214:  power (low-act)
 */
#define GPIO_CDA    0
#define GPIO_CDB    1
#define GPIO_CARDIRQ    4
#define GPIO_RESET  204
#define GPIO_OUTEN  205
#define GPIO_VSL    208
#define GPIO_VSH    209
#define GPIO_BATTDEAD   210
#define GPIO_BATTWARN   211
#define GPIO_POWER  214

struct xxs1500_pcmcia_sock {
    struct pcmcia_socket    socket;
    void        *virt_io;

    phys_addr_t phys_io;
    phys_addr_t phys_attr;
    phys_addr_t phys_mem;

    /* previous flags for set_socket() */
    unsigned int old_flags;
};

#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)

static irqreturn_t cdirq(int irq, void *data)
{
    struct xxs1500_pcmcia_sock *sock = data;

    pcmcia_parse_events(&sock->socket, SS_DETECT);

    return IRQ_HANDLED;
}

static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
                    struct socket_state_t *state)
{
    struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
    unsigned int changed;

    /* power control */
    switch (state->Vcc) {
    case 0:
        gpio_set_value(GPIO_POWER, 1);  /* power off */
        break;
    case 33:
        gpio_set_value(GPIO_POWER, 0);  /* power on */
        break;
    case 50:
    default:
        return -EINVAL;
    }

    changed = state->flags ^ sock->old_flags;

    if (changed & SS_RESET) {
        if (state->flags & SS_RESET) {
            gpio_set_value(GPIO_RESET, 1);  /* assert reset */
            gpio_set_value(GPIO_OUTEN, 1);  /* buffers off */
        } else {
            gpio_set_value(GPIO_RESET, 0);  /* deassert reset */
            gpio_set_value(GPIO_OUTEN, 0);  /* buffers on */
            msleep(500);
        }
    }

    sock->old_flags = state->flags;

    return 0;
}

static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
                     unsigned int *value)
{
    unsigned int status;
    int i;

    status = 0;

    /* check carddetects: GPIO[0:1] must both be low */
    if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
        status |= SS_DETECT;

    /* determine card voltage: GPIO[208:209] binary value */
    i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);

    switch (i) {
    case 0:
    case 1:
    case 2:
        status |= SS_3VCARD;    /* 3V card */
        break;
    case 3:             /* 5V card, unsupported */
    default:
        status |= SS_XVCARD;    /* treated as unsupported in core */
    }

    /* GPIO214: low active power switch */
    status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;

    /* GPIO204: high-active reset line */
    status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;

    /* other stuff */
    status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
    status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;

    *value = status;

    return 0;
}

static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
{
    gpio_direction_input(GPIO_CDA);
    gpio_direction_input(GPIO_CDB);
    gpio_direction_input(GPIO_VSL);
    gpio_direction_input(GPIO_VSH);
    gpio_direction_input(GPIO_BATTDEAD);
    gpio_direction_input(GPIO_BATTWARN);
    gpio_direction_output(GPIO_RESET, 1);   /* assert reset */
    gpio_direction_output(GPIO_OUTEN, 1);   /* disable buffers */
    gpio_direction_output(GPIO_POWER, 1);   /* power off */

    return 0;
}

static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
{
    return 0;
}

static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
                    struct pccard_io_map *map)
{
    struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);

    map->start = (u32)sock->virt_io;
    map->stop = map->start + IO_MAP_SIZE;

    return 0;
}

static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
                     struct pccard_mem_map *map)
{
    struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);

    if (map->flags & MAP_ATTRIB)
        map->static_start = sock->phys_attr + map->card_start;
    else
        map->static_start = sock->phys_mem + map->card_start;

    return 0;
}

static struct pccard_operations xxs1500_pcmcia_operations = {
    .init           = xxs1500_pcmcia_sock_init,
    .suspend        = xxs1500_pcmcia_sock_suspend,
    .get_status     = xxs1500_pcmcia_get_status,
    .set_socket     = xxs1500_pcmcia_configure,
    .set_io_map     = au1x00_pcmcia_set_io_map,
    .set_mem_map        = au1x00_pcmcia_set_mem_map,
};

static int __devinit xxs1500_pcmcia_probe(struct platform_device *pdev)
{
    struct xxs1500_pcmcia_sock *sock;
    struct resource *r;
    int ret, irq;

    sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
    if (!sock)
        return -ENOMEM;

    ret = -ENODEV;

    /* 36bit PCMCIA Attribute area address */
    r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
    if (!r) {
        dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n");
        goto out0;
    }
    sock->phys_attr = r->start;

    /* 36bit PCMCIA Memory area address */
    r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
    if (!r) {
        dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n");
        goto out0;
    }
    sock->phys_mem = r->start;

    /* 36bit PCMCIA IO area address */
    r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
    if (!r) {
        dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n");
        goto out0;
    }
    sock->phys_io = r->start;


    /*
     * PCMCIA client drivers use the inb/outb macros to access
     * the IO registers.  Since mips_io_port_base is added
     * to the access address of the mips implementation of
     * inb/outb, we need to subtract it here because we want
     * to access the I/O or MEM address directly, without
     * going through this "mips_io_port_base" mechanism.
     */
    sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
                 mips_io_port_base);

    if (!sock->virt_io) {
        dev_err(&pdev->dev, "cannot remap IO area\n");
        ret = -ENOMEM;
        goto out0;
    }

    sock->socket.ops    = &xxs1500_pcmcia_operations;
    sock->socket.owner  = THIS_MODULE;
    sock->socket.pci_irq    = gpio_to_irq(GPIO_CARDIRQ);
    sock->socket.features   = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
    sock->socket.map_size   = MEM_MAP_SIZE;
    sock->socket.io_offset  = (unsigned long)sock->virt_io;
    sock->socket.dev.parent = &pdev->dev;
    sock->socket.resource_ops = &pccard_static_ops;

    platform_set_drvdata(pdev, sock);

    /* setup carddetect irq: use one of the 2 GPIOs as an
     * edge detector.
     */
    irq = gpio_to_irq(GPIO_CDA);
    irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
    ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
    if (ret) {
        dev_err(&pdev->dev, "cannot setup cd irq\n");
        goto out1;
    }

    ret = pcmcia_register_socket(&sock->socket);
    if (ret) {
        dev_err(&pdev->dev, "failed to register\n");
        goto out2;
    }

    printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");

    return 0;

out2:
    free_irq(gpio_to_irq(GPIO_CDA), sock);
out1:
    iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
out0:
    kfree(sock);
    return ret;
}

static int __devexit xxs1500_pcmcia_remove(struct platform_device *pdev)
{
    struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);

    pcmcia_unregister_socket(&sock->socket);
    free_irq(gpio_to_irq(GPIO_CDA), sock);
    iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
    kfree(sock);

    return 0;
}

static struct platform_driver xxs1500_pcmcia_socket_driver = {
    .driver = {
        .name   = "xxs1500_pcmcia",
        .owner  = THIS_MODULE,
    },
    .probe      = xxs1500_pcmcia_probe,
    .remove     = __devexit_p(xxs1500_pcmcia_remove),
};

module_platform_driver(xxs1500_pcmcia_socket_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
MODULE_AUTHOR("Manuel Lauss");