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/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
  36 static struct pcmcia_irqs irqs[] = {
  37         { 0, gpio_to_irq(VIPER_CF_CD_GPIO),  "PCMCIA_CD" }
  38 };
  39
  40 static 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
  69 err_dir:
  70         gpio_free(VIPER_CF_POWER_GPIO);
  71 err_request_pwr:
  72         gpio_free(VIPER_CF_RDY_GPIO);
  73 err_request_rdy:
  74         gpio_free(VIPER_CF_CD_GPIO);
  75 err_request_cd:
  76         printk(KERN_ERR "viper: Failed to setup PCMCIA GPIOs\n");
  77         return -1;
  78 }
  79
  80 /*
  81  * Release all resources.
  82  */
  83 static 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
  91 static 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
 103 static 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
 126 static void viper_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 127 {
 128 }
 129
 130 static void viper_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 131 {
 132 }
 133
 134 static 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
 145 static struct platform_device *viper_pcmcia_device;
 146
 147 static 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
 171 static void __exit viper_pcmcia_exit(void)
 172 {
 173         platform_device_unregister(viper_pcmcia_device);
 174 }
 175
 176 module_init(viper_pcmcia_init);
 177 module_exit(viper_pcmcia_exit);
 178
 179 MODULE_LICENSE("GPL");