sa1111_badge4.c

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/*
 * linux/drivers/pcmcia/sa1100_badge4.c
 *
 * BadgePAD 4 PCMCIA specific routines
 *
 *   Christopher Hoover <[email protected]>
 *
 * Copyright (C) 2002 Hewlett-Packard Company
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/init.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <mach/badge4.h>
#include <asm/hardware/sa1111.h>

#include "sa1111_generic.h"

/*
 * BadgePAD 4 Details
 *
 * PCM Vcc:
 *
 *  PCM Vcc on BadgePAD 4 can be jumpered for 3v3 (short pins 1 and 3
 *  on JP6) or 5v0 (short pins 3 and 5 on JP6).
 *
 * PCM Vpp:
 *
 *  PCM Vpp on BadgePAD 4 can be jumpered for 12v0 (short pins 4 and 6
 *  on JP6) or tied to PCM Vcc (short pins 2 and 4 on JP6).  N.B.,
 *  12v0 operation requires that the power supply actually supply 12v0
 *  via pin 7 of JP7.
 *
 * CF Vcc:
 *
 *  CF Vcc on BadgePAD 4 can be jumpered either for 3v3 (short pins 1
 *  and 2 on JP10) or 5v0 (short pins 2 and 3 on JP10).
 *
 * Unfortunately there's no way programmatically to determine how a
 * given board is jumpered.  This code assumes a default jumpering
 * as described below.
 *
 * If the defaults aren't correct, you may override them with a pcmv
 * setup argument: pcmv=<pcm vcc>,<pcm vpp>,<cf vcc>.  The units are
 * tenths of volts; e.g. pcmv=33,120,50 indicates 3v3 PCM Vcc, 12v0
 * PCM Vpp, and 5v0 CF Vcc.
 *
 */

static int badge4_pcmvcc = 50;  /* pins 3 and 5 jumpered on JP6 */
static int badge4_pcmvpp = 50;  /* pins 2 and 4 jumpered on JP6 */
static int badge4_cfvcc = 33;   /* pins 1 and 2 jumpered on JP10 */

static void complain_about_jumpering(const char *whom,
                     const char *supply,
                     int given, int wanted)
{
    printk(KERN_ERR
     "%s: %s %d.%dV wanted but board is jumpered for %s %d.%dV operation"
     "; re-jumper the board and/or use pcmv=xx,xx,xx\n",
           whom, supply,
           wanted / 10, wanted % 10,
           supply,
           given / 10, given % 10);
}

static int
badge4_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
{
    int ret;

    switch (skt->nr) {
    case 0:
        if ((state->Vcc != 0) &&
            (state->Vcc != badge4_pcmvcc)) {
            complain_about_jumpering(__func__, "pcmvcc",
                         badge4_pcmvcc, state->Vcc);
            // Apply power regardless of the jumpering.
            // return -1;
        }
        if ((state->Vpp != 0) &&
            (state->Vpp != badge4_pcmvpp)) {
            complain_about_jumpering(__func__, "pcmvpp",
                         badge4_pcmvpp, state->Vpp);
            return -1;
        }
        break;

    case 1:
        if ((state->Vcc != 0) &&
            (state->Vcc != badge4_cfvcc)) {
            complain_about_jumpering(__func__, "cfvcc",
                         badge4_cfvcc, state->Vcc);
            return -1;
        }
        break;

    default:
        return -1;
    }

    ret = sa1111_pcmcia_configure_socket(skt, state);
    if (ret == 0) {
        unsigned long flags;
        int need5V;

        local_irq_save(flags);

        need5V = ((state->Vcc == 50) || (state->Vpp == 50));

        badge4_set_5V(BADGE4_5V_PCMCIA_SOCK(skt->nr), need5V);

        local_irq_restore(flags);
    }

    return ret;
}

static struct pcmcia_low_level badge4_pcmcia_ops = {
    .owner          = THIS_MODULE,
    .configure_socket   = badge4_pcmcia_configure_socket,
    .first          = 0,
    .nr         = 2,
};

int pcmcia_badge4_init(struct device *dev)
{
    int ret = -ENODEV;

    if (machine_is_badge4()) {
        printk(KERN_INFO
               "%s: badge4_pcmvcc=%d, badge4_pcmvpp=%d, badge4_cfvcc=%d\n",
               __func__,
               badge4_pcmvcc, badge4_pcmvpp, badge4_cfvcc);

        sa11xx_drv_pcmcia_ops(&badge4_pcmcia_ops);
        ret = sa1111_pcmcia_add(dev, &badge4_pcmcia_ops,
                sa11xx_drv_pcmcia_add_one);
    }

    return ret;
}

static int __init pcmv_setup(char *s)
{
    int v[4];

    s = get_options(s, ARRAY_SIZE(v), v);

    if (v[0] >= 1) badge4_pcmvcc = v[1];
    if (v[0] >= 2) badge4_pcmvpp = v[2];
    if (v[0] >= 3) badge4_cfvcc = v[3];

    return 1;
}

__setup("pcmv=", pcmv_setup);