drivers/pcmcia/pxa2xx_viper.c

   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/viper.h>
  30 #include <asm/mach-types.h>
  31
  32 #include "soc_common.h"
  33 #include "pxa2xx_base.h"
  34
  35 static struct pcmcia_irqs irqs[] = {
  36         { 0, gpio_to_irq(VIPER_CF_CD_GPIO),  "PCMCIA_CD" }
  37 };
  38
  39 static int viper_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  40 {
  41         unsigned long flags;
  42
  43         skt->irq = gpio_to_irq(VIPER_CF_RDY_GPIO);
  44
  45         if (gpio_request(VIPER_CF_CD_GPIO, "CF detect"))
  46                 goto err_request_cd;
  47
  48         if (gpio_request(VIPER_CF_RDY_GPIO, "CF ready"))
  49                 goto err_request_rdy;
  50
  51         if (gpio_request(VIPER_CF_POWER_GPIO, "CF power"))
  52                 goto err_request_pwr;
  53
  54         local_irq_save(flags);
  55
  56         /* GPIO 82 is the CF power enable line. initially off */
  57         if (gpio_direction_output(VIPER_CF_POWER_GPIO, 0) ||
  58             gpio_direction_input(VIPER_CF_CD_GPIO) ||
  59             gpio_direction_input(VIPER_CF_RDY_GPIO)) {
  60                 local_irq_restore(flags);
  61                 goto err_dir;
  62         }
  63
  64         local_irq_restore(flags);
  65
  66         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  67
  68 err_dir:
  69         gpio_free(VIPER_CF_POWER_GPIO);
  70 err_request_pwr:
  71         gpio_free(VIPER_CF_RDY_GPIO);
  72 err_request_rdy:
  73         gpio_free(VIPER_CF_CD_GPIO);
  74 err_request_cd:
  75         printk(KERN_ERR "viper: Failed to setup PCMCIA GPIOs\n");
  76         return -1;
  77 }
  78
  79 /*
  80  * Release all resources.
  81  */
  82 static void viper_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  83 {
  84         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  85         gpio_free(VIPER_CF_POWER_GPIO);
  86         gpio_free(VIPER_CF_RDY_GPIO);
  87         gpio_free(VIPER_CF_CD_GPIO);
  88 }
  89
  90 static void viper_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  91                                       struct pcmcia_state *state)
  92 {
  93         state->detect = gpio_get_value(VIPER_CF_CD_GPIO) ? 0 : 1;
  94         state->ready  = gpio_get_value(VIPER_CF_RDY_GPIO) ? 1 : 0;
  95         state->bvd1   = 1;
  96         state->bvd2   = 1;
  97         state->wrprot = 0;
  98         state->vs_3v  = 1; /* Can only apply 3.3V */
  99         state->vs_Xv  = 0;
 100 }
 101
 102 static int viper_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 103                                          const socket_state_t *state)
 104 {
 105         /* Silently ignore Vpp, output enable, speaker enable. */
 106         viper_cf_rst(state->flags & SS_RESET);
 107
 108         /* Apply socket voltage */
 109         switch (state->Vcc) {
 110         case 0:
 111                 gpio_set_value(VIPER_CF_POWER_GPIO, 0);
 112                 break;
 113         case 33:
 114                 gpio_set_value(VIPER_CF_POWER_GPIO, 1);
 115                 break;
 116         default:
 117                 printk(KERN_ERR "%s: Unsupported Vcc:%d\n",
 118                        __func__, state->Vcc);
 119                 return -1;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void viper_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 126 {
 127 }
 128
 129 static void viper_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 130 {
 131 }
 132
 133 static struct pcmcia_low_level viper_pcmcia_ops __initdata = {
 134         .owner                  = THIS_MODULE,
 135         .hw_init                = viper_pcmcia_hw_init,
 136         .hw_shutdown            = viper_pcmcia_hw_shutdown,
 137         .socket_state           = viper_pcmcia_socket_state,
 138         .configure_socket       = viper_pcmcia_configure_socket,
 139         .socket_init            = viper_pcmcia_socket_init,
 140         .socket_suspend         = viper_pcmcia_socket_suspend,
 141         .nr                     = 1,
 142 };
 143
 144 static struct platform_device *viper_pcmcia_device;
 145
 146 static int __init viper_pcmcia_init(void)
 147 {
 148         int ret;
 149
 150         if (!machine_is_viper())
 151                 return -ENODEV;
 152
 153         viper_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 154         if (!viper_pcmcia_device)
 155                 return -ENOMEM;
 156
 157         ret = platform_device_add_data(viper_pcmcia_device,
 158                                        &viper_pcmcia_ops,
 159                                        sizeof(viper_pcmcia_ops));
 160
 161         if (!ret)
 162                 ret = platform_device_add(viper_pcmcia_device);
 163
 164         if (ret)
 165                 platform_device_put(viper_pcmcia_device);
 166
 167         return ret;
 168 }
 169
 170 static void __exit viper_pcmcia_exit(void)
 171 {
 172         platform_device_unregister(viper_pcmcia_device);
 173 }
 174
 175 module_init(viper_pcmcia_init);
 176 module_exit(viper_pcmcia_exit);
 177
 178 MODULE_LICENSE("GPL");