linux/drivers/pcmcia/pxa2xx_viper.c
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   1/*
   2 * Viper/Zeus PCMCIA support
   3 *   Copyright 2004 Arcom Control Systems
   4 *
   5 * Maintained by Marc Zyngier <maz@misterjones.org>
   6 *
   7 * Based on:
   8 *   iPAQ h2200 PCMCIA support
   9 *   Copyright 2004 Koen Kooi <koen@vestingbar.nl>
  10 *
  11 * This file is subject to the terms and conditions of the GNU General Public
  12 * License.  See the file COPYING in the main directory of this archive for
  13 * more details.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/kernel.h>
  19#include <linux/errno.h>
  20#include <linux/interrupt.h>
  21#include <linux/platform_device.h>
  22#include <linux/gpio.h>
  23
  24#include <pcmcia/ss.h>
  25
  26#include <asm/irq.h>
  27
  28#include <mach/arcom-pcmcia.h>
  29
  30#include "soc_common.h"
  31#include "pxa2xx_base.h"
  32
  33static struct platform_device *arcom_pcmcia_dev;
  34
  35static struct pcmcia_irqs irqs[] = {
  36        {
  37                .sock   = 0,
  38                .str    = "PCMCIA_CD",
  39        },
  40};
  41
  42static inline struct arcom_pcmcia_pdata *viper_get_pdata(void)
  43{
  44        return arcom_pcmcia_dev->dev.platform_data;
  45}
  46
  47static int viper_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  48{
  49        struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
  50        unsigned long flags;
  51
  52        skt->socket.pci_irq = gpio_to_irq(pdata->rdy_gpio);
  53        irqs[0].irq = gpio_to_irq(pdata->cd_gpio);
  54
  55        if (gpio_request(pdata->cd_gpio, "CF detect"))
  56                goto err_request_cd;
  57
  58        if (gpio_request(pdata->rdy_gpio, "CF ready"))
  59                goto err_request_rdy;
  60
  61        if (gpio_request(pdata->pwr_gpio, "CF power"))
  62                goto err_request_pwr;
  63
  64        local_irq_save(flags);
  65
  66        if (gpio_direction_output(pdata->pwr_gpio, 0) ||
  67            gpio_direction_input(pdata->cd_gpio) ||
  68            gpio_direction_input(pdata->rdy_gpio)) {
  69                local_irq_restore(flags);
  70                goto err_dir;
  71        }
  72
  73        local_irq_restore(flags);
  74
  75        return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  76
  77err_dir:
  78        gpio_free(pdata->pwr_gpio);
  79err_request_pwr:
  80        gpio_free(pdata->rdy_gpio);
  81err_request_rdy:
  82        gpio_free(pdata->cd_gpio);
  83err_request_cd:
  84        dev_err(&arcom_pcmcia_dev->dev, "Failed to setup PCMCIA GPIOs\n");
  85        return -1;
  86}
  87
  88/*
  89 * Release all resources.
  90 */
  91static void viper_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  92{
  93        struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
  94
  95        soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  96        gpio_free(pdata->pwr_gpio);
  97        gpio_free(pdata->rdy_gpio);
  98        gpio_free(pdata->cd_gpio);
  99}
 100
 101static void viper_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
 102                                      struct pcmcia_state *state)
 103{
 104        struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
 105
 106        state->detect = !gpio_get_value(pdata->cd_gpio);
 107        state->ready  = !!gpio_get_value(pdata->rdy_gpio);
 108        state->bvd1   = 1;
 109        state->bvd2   = 1;
 110        state->wrprot = 0;
 111        state->vs_3v  = 1; /* Can only apply 3.3V */
 112        state->vs_Xv  = 0;
 113}
 114
 115static int viper_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 116                                         const socket_state_t *state)
 117{
 118        struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
 119
 120        /* Silently ignore Vpp, output enable, speaker enable. */
 121        pdata->reset(state->flags & SS_RESET);
 122
 123        /* Apply socket voltage */
 124        switch (state->Vcc) {
 125        case 0:
 126                gpio_set_value(pdata->pwr_gpio, 0);
 127                break;
 128        case 33:
 129                gpio_set_value(pdata->pwr_gpio, 1);
 130                break;
 131        default:
 132                dev_err(&arcom_pcmcia_dev->dev, "Unsupported Vcc:%d\n", state->Vcc);
 133                return -1;
 134        }
 135
 136        return 0;
 137}
 138
 139static struct pcmcia_low_level viper_pcmcia_ops = {
 140        .owner                  = THIS_MODULE,
 141        .hw_init                = viper_pcmcia_hw_init,
 142        .hw_shutdown            = viper_pcmcia_hw_shutdown,
 143        .socket_state           = viper_pcmcia_socket_state,
 144        .configure_socket       = viper_pcmcia_configure_socket,
 145        .nr                     = 1,
 146};
 147
 148static struct platform_device *viper_pcmcia_device;
 149
 150static int viper_pcmcia_probe(struct platform_device *pdev)
 151{
 152        int ret;
 153
 154        /* I can't imagine more than one device, but you never know... */
 155        if (arcom_pcmcia_dev)
 156                return -EEXIST;
 157
 158        if (!pdev->dev.platform_data)
 159                return -EINVAL;
 160
 161        viper_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 162        if (!viper_pcmcia_device)
 163                return -ENOMEM;
 164
 165        arcom_pcmcia_dev = pdev;
 166
 167        viper_pcmcia_device->dev.parent = &pdev->dev;
 168
 169        ret = platform_device_add_data(viper_pcmcia_device,
 170                                       &viper_pcmcia_ops,
 171                                       sizeof(viper_pcmcia_ops));
 172
 173        if (!ret)
 174                ret = platform_device_add(viper_pcmcia_device);
 175
 176        if (ret) {
 177                platform_device_put(viper_pcmcia_device);
 178                arcom_pcmcia_dev = NULL;
 179        }
 180
 181        return ret;
 182}
 183
 184static int viper_pcmcia_remove(struct platform_device *pdev)
 185{
 186        platform_device_unregister(viper_pcmcia_device);
 187        arcom_pcmcia_dev = NULL;
 188        return 0;
 189}
 190
 191static struct platform_device_id viper_pcmcia_id_table[] = {
 192        { .name = "viper-pcmcia", },
 193        { .name = "zeus-pcmcia",  },
 194        { },
 195};
 196
 197static struct platform_driver viper_pcmcia_driver = {
 198        .probe          = viper_pcmcia_probe,
 199        .remove         = viper_pcmcia_remove,
 200        .driver         = {
 201                .name   = "arcom-pcmcia",
 202                .owner  = THIS_MODULE,
 203        },
 204        .id_table       = viper_pcmcia_id_table,
 205};
 206
 207static int __init viper_pcmcia_init(void)
 208{
 209        return platform_driver_register(&viper_pcmcia_driver);
 210}
 211
 212static void __exit viper_pcmcia_exit(void)
 213{
 214        return platform_driver_unregister(&viper_pcmcia_driver);
 215}
 216
 217module_init(viper_pcmcia_init);
 218module_exit(viper_pcmcia_exit);
 219
 220MODULE_DEVICE_TABLE(platform, viper_pcmcia_id_table);
 221MODULE_LICENSE("GPL");
 222