drivers/pcmcia/pxa2xx_viper.c

   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 <linux/platform_data/pcmcia-pxa2xx_viper.h>
  29
  30 #include "soc_common.h"
  31 #include "pxa2xx_base.h"
  32
  33 static struct platform_device *arcom_pcmcia_dev;
  34
  35 static inline struct arcom_pcmcia_pdata *viper_get_pdata(void)
  36 {
  37         return arcom_pcmcia_dev->dev.platform_data;
  38 }
  39
  40 static int viper_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  41 {
  42         struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
  43         unsigned long flags;
  44
  45         skt->stat[SOC_STAT_CD].gpio = pdata->cd_gpio;
  46         skt->stat[SOC_STAT_CD].name = "PCMCIA_CD";
  47         skt->stat[SOC_STAT_RDY].gpio = pdata->rdy_gpio;
  48         skt->stat[SOC_STAT_RDY].name = "CF ready";
  49
  50         if (gpio_request(pdata->pwr_gpio, "CF power"))
  51                 goto err_request_pwr;
  52
  53         local_irq_save(flags);
  54
  55         if (gpio_direction_output(pdata->pwr_gpio, 0)) {
  56                 local_irq_restore(flags);
  57                 goto err_dir;
  58         }
  59
  60         local_irq_restore(flags);
  61
  62         return 0;
  63
  64 err_dir:
  65         gpio_free(pdata->pwr_gpio);
  66 err_request_pwr:
  67         dev_err(&arcom_pcmcia_dev->dev, "Failed to setup PCMCIA GPIOs\n");
  68         return -1;
  69 }
  70
  71 /*
  72  * Release all resources.
  73  */
  74 static void viper_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  75 {
  76         struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
  77
  78         gpio_free(pdata->pwr_gpio);
  79 }
  80
  81 static void viper_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  82                                       struct pcmcia_state *state)
  83 {
  84         state->vs_3v  = 1; /* Can only apply 3.3V */
  85         state->vs_Xv  = 0;
  86 }
  87
  88 static int viper_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  89                                          const socket_state_t *state)
  90 {
  91         struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
  92
  93         /* Silently ignore Vpp, output enable, speaker enable. */
  94         pdata->reset(state->flags & SS_RESET);
  95
  96         /* Apply socket voltage */
  97         switch (state->Vcc) {
  98         case 0:
  99                 gpio_set_value(pdata->pwr_gpio, 0);
 100                 break;
 101         case 33:
 102                 gpio_set_value(pdata->pwr_gpio, 1);
 103                 break;
 104         default:
 105                 dev_err(&arcom_pcmcia_dev->dev, "Unsupported Vcc:%d\n", state->Vcc);
 106                 return -1;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static struct pcmcia_low_level viper_pcmcia_ops = {
 113         .owner                  = THIS_MODULE,
 114         .hw_init                = viper_pcmcia_hw_init,
 115         .hw_shutdown            = viper_pcmcia_hw_shutdown,
 116         .socket_state           = viper_pcmcia_socket_state,
 117         .configure_socket       = viper_pcmcia_configure_socket,
 118         .nr                     = 1,
 119 };
 120
 121 static struct platform_device *viper_pcmcia_device;
 122
 123 static int viper_pcmcia_probe(struct platform_device *pdev)
 124 {
 125         int ret;
 126
 127         /* I can't imagine more than one device, but you never know... */
 128         if (arcom_pcmcia_dev)
 129                 return -EEXIST;
 130
 131         if (!pdev->dev.platform_data)
 132                 return -EINVAL;
 133
 134         viper_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 135         if (!viper_pcmcia_device)
 136                 return -ENOMEM;
 137
 138         arcom_pcmcia_dev = pdev;
 139
 140         viper_pcmcia_device->dev.parent = &pdev->dev;
 141
 142         ret = platform_device_add_data(viper_pcmcia_device,
 143                                        &viper_pcmcia_ops,
 144                                        sizeof(viper_pcmcia_ops));
 145
 146         if (!ret)
 147                 ret = platform_device_add(viper_pcmcia_device);
 148
 149         if (ret) {
 150                 platform_device_put(viper_pcmcia_device);
 151                 arcom_pcmcia_dev = NULL;
 152         }
 153
 154         return ret;
 155 }
 156
 157 static int viper_pcmcia_remove(struct platform_device *pdev)
 158 {
 159         platform_device_unregister(viper_pcmcia_device);
 160         arcom_pcmcia_dev = NULL;
 161         return 0;
 162 }
 163
 164 static struct platform_device_id viper_pcmcia_id_table[] = {
 165         { .name = "viper-pcmcia", },
 166         { .name = "zeus-pcmcia",  },
 167         { },
 168 };
 169
 170 static struct platform_driver viper_pcmcia_driver = {
 171         .probe          = viper_pcmcia_probe,
 172         .remove         = viper_pcmcia_remove,
 173         .driver         = {
 174                 .name   = "arcom-pcmcia",
 175                 .owner  = THIS_MODULE,
 176         },
 177         .id_table       = viper_pcmcia_id_table,
 178 };
 179
 180 module_platform_driver(viper_pcmcia_driver);
 181
 182 MODULE_DEVICE_TABLE(platform, viper_pcmcia_id_table);
 183 MODULE_LICENSE("GPL");