linux/drivers/pcmcia/pxa2xx_viper.c
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   1/*
   2 * VIPER PCMCIA support
   3 *   Copyright 2004 Arcom Control Systems
   4 *
   5 * Maintained by Marc Zyngier <maz@misterjones.org>
   6 *                            <marc.zyngier@altran.com>
   7 *
   8 * Based on:
   9 *   iPAQ h2200 PCMCIA support
  10 *   Copyright 2004 Koen Kooi <koen@vestingbar.nl>
  11 *
  12 * This file is subject to the terms and conditions of the GNU General Public
  13 * License.  See the file COPYING in the main directory of this archive for
  14 * more details.
  15 */
  16
  17#include <linux/module.h>
  18#include <linux/init.h>
  19#include <linux/kernel.h>
  20#include <linux/errno.h>
  21#include <linux/interrupt.h>
  22#include <linux/platform_device.h>
  23#include <linux/gpio.h>
  24
  25#include <pcmcia/ss.h>
  26
  27#include <asm/irq.h>
  28
  29#include <mach/pxa-regs.h>
  30#include <mach/viper.h>
  31#include <asm/mach-types.h>
  32
  33#include "soc_common.h"
  34#include "pxa2xx_base.h"
  35
  36static struct pcmcia_irqs irqs[] = {
  37        { 0, gpio_to_irq(VIPER_CF_CD_GPIO),  "PCMCIA_CD" }
  38};
  39
  40static int viper_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  41{
  42        unsigned long flags;
  43
  44        skt->irq = gpio_to_irq(VIPER_CF_RDY_GPIO);
  45
  46        if (gpio_request(VIPER_CF_CD_GPIO, "CF detect"))
  47                goto err_request_cd;
  48
  49        if (gpio_request(VIPER_CF_RDY_GPIO, "CF ready"))
  50                goto err_request_rdy;
  51
  52        if (gpio_request(VIPER_CF_POWER_GPIO, "CF power"))
  53                goto err_request_pwr;
  54
  55        local_irq_save(flags);
  56
  57        /* GPIO 82 is the CF power enable line. initially off */
  58        if (gpio_direction_output(VIPER_CF_POWER_GPIO, 0) ||
  59            gpio_direction_input(VIPER_CF_CD_GPIO) ||
  60            gpio_direction_input(VIPER_CF_RDY_GPIO)) {
  61                local_irq_restore(flags);
  62                goto err_dir;
  63        }
  64
  65        local_irq_restore(flags);
  66
  67        return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  68
  69err_dir:
  70        gpio_free(VIPER_CF_POWER_GPIO);
  71err_request_pwr:
  72        gpio_free(VIPER_CF_RDY_GPIO);
  73err_request_rdy:
  74        gpio_free(VIPER_CF_CD_GPIO);
  75err_request_cd:
  76        printk(KERN_ERR "viper: Failed to setup PCMCIA GPIOs\n");
  77        return -1;
  78}
  79
  80/*
  81 * Release all resources.
  82 */
  83static void viper_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  84{
  85        soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  86        gpio_free(VIPER_CF_POWER_GPIO);
  87        gpio_free(VIPER_CF_RDY_GPIO);
  88        gpio_free(VIPER_CF_CD_GPIO);
  89}
  90
  91static void viper_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  92                                      struct pcmcia_state *state)
  93{
  94        state->detect = gpio_get_value(VIPER_CF_CD_GPIO) ? 0 : 1;
  95        state->ready  = gpio_get_value(VIPER_CF_RDY_GPIO) ? 1 : 0;
  96        state->bvd1   = 1;
  97        state->bvd2   = 1;
  98        state->wrprot = 0;
  99        state->vs_3v  = 1; /* Can only apply 3.3V */
 100        state->vs_Xv  = 0;
 101}
 102
 103static int viper_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 104                                         const socket_state_t *state)
 105{
 106        /* Silently ignore Vpp, output enable, speaker enable. */
 107        viper_cf_rst(state->flags & SS_RESET);
 108
 109        /* Apply socket voltage */
 110        switch (state->Vcc) {
 111        case 0:
 112                gpio_set_value(VIPER_CF_POWER_GPIO, 0);
 113                break;
 114        case 33:
 115                gpio_set_value(VIPER_CF_POWER_GPIO, 1);
 116                break;
 117        default:
 118                printk(KERN_ERR "%s: Unsupported Vcc:%d\n",
 119                       __func__, state->Vcc);
 120                return -1;
 121        }
 122
 123        return 0;
 124}
 125
 126static void viper_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 127{
 128}
 129
 130static void viper_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 131{
 132}
 133
 134static struct pcmcia_low_level viper_pcmcia_ops __initdata = {
 135        .owner                  = THIS_MODULE,
 136        .hw_init                = viper_pcmcia_hw_init,
 137        .hw_shutdown            = viper_pcmcia_hw_shutdown,
 138        .socket_state           = viper_pcmcia_socket_state,
 139        .configure_socket       = viper_pcmcia_configure_socket,
 140        .socket_init            = viper_pcmcia_socket_init,
 141        .socket_suspend         = viper_pcmcia_socket_suspend,
 142        .nr                     = 1,
 143};
 144
 145static struct platform_device *viper_pcmcia_device;
 146
 147static int __init viper_pcmcia_init(void)
 148{
 149        int ret;
 150
 151        if (!machine_is_viper())
 152                return -ENODEV;
 153
 154        viper_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 155        if (!viper_pcmcia_device)
 156                return -ENOMEM;
 157
 158        ret = platform_device_add_data(viper_pcmcia_device,
 159                                       &viper_pcmcia_ops,
 160                                       sizeof(viper_pcmcia_ops));
 161
 162        if (!ret)
 163                ret = platform_device_add(viper_pcmcia_device);
 164
 165        if (ret)
 166                platform_device_put(viper_pcmcia_device);
 167
 168        return ret;
 169}
 170
 171static void __exit viper_pcmcia_exit(void)
 172{
 173        platform_device_unregister(viper_pcmcia_device);
 174}
 175
 176module_init(viper_pcmcia_init);
 177module_exit(viper_pcmcia_exit);
 178
 179MODULE_LICENSE("GPL");
 180