drivers/pcmcia/pxa2xx_cm_x270.c

   1 /*
   2  * linux/drivers/pcmcia/pxa/pxa_cm_x270.c
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * Compulab Ltd., 2003, 2007, 2008
   9  * Mike Rapoport <mike@compulab.co.il>
  10  *
  11  */
  12
  13 #include <linux/platform_device.h>
  14 #include <linux/irq.h>
  15 #include <linux/delay.h>
  16 #include <linux/gpio.h>
  17 #include <linux/export.h>
  18
  19 #include "soc_common.h"
  20
  21 #define GPIO_PCMCIA_S0_CD_VALID (84)
  22 #define GPIO_PCMCIA_S0_RDYINT   (82)
  23 #define GPIO_PCMCIA_RESET       (53)
  24
  25 static int cmx270_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  26 {
  27         int ret = gpio_request(GPIO_PCMCIA_RESET, "PCCard reset");
  28         if (ret)
  29                 return ret;
  30         gpio_direction_output(GPIO_PCMCIA_RESET, 0);
  31
  32         skt->stat[SOC_STAT_CD].gpio = GPIO_PCMCIA_S0_CD_VALID;
  33         skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  34         skt->stat[SOC_STAT_RDY].gpio = GPIO_PCMCIA_S0_RDYINT;
  35         skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
  36
  37         return ret;
  38 }
  39
  40 static void cmx270_pcmcia_shutdown(struct soc_pcmcia_socket *skt)
  41 {
  42         gpio_free(GPIO_PCMCIA_RESET);
  43 }
  44
  45
  46 static void cmx270_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  47                                        struct pcmcia_state *state)
  48 {
  49         state->vs_3v  = 0;
  50         state->vs_Xv  = 0;
  51 }
  52
  53
  54 static int cmx270_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  55                                           const socket_state_t *state)
  56 {
  57         switch (skt->nr) {
  58         case 0:
  59                 if (state->flags & SS_RESET) {
  60                         gpio_set_value(GPIO_PCMCIA_RESET, 1);
  61                         udelay(10);
  62                         gpio_set_value(GPIO_PCMCIA_RESET, 0);
  63                 }
  64                 break;
  65         }
  66
  67         return 0;
  68 }
  69
  70 static struct pcmcia_low_level cmx270_pcmcia_ops __initdata = {
  71         .owner                  = THIS_MODULE,
  72         .hw_init                = cmx270_pcmcia_hw_init,
  73         .hw_shutdown            = cmx270_pcmcia_shutdown,
  74         .socket_state           = cmx270_pcmcia_socket_state,
  75         .configure_socket       = cmx270_pcmcia_configure_socket,
  76         .nr                     = 1,
  77 };
  78
  79 static struct platform_device *cmx270_pcmcia_device;
  80
  81 int __init cmx270_pcmcia_init(void)
  82 {
  83         int ret;
  84
  85         cmx270_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
  86
  87         if (!cmx270_pcmcia_device)
  88                 return -ENOMEM;
  89
  90         ret = platform_device_add_data(cmx270_pcmcia_device, &cmx270_pcmcia_ops,
  91                                        sizeof(cmx270_pcmcia_ops));
  92
  93         if (ret == 0) {
  94                 printk(KERN_INFO "Registering cm-x270 PCMCIA interface.\n");
  95                 ret = platform_device_add(cmx270_pcmcia_device);
  96         }
  97
  98         if (ret)
  99                 platform_device_put(cmx270_pcmcia_device);
 100
 101         return ret;
 102 }
 103
 104 void __exit cmx270_pcmcia_exit(void)
 105 {
 106         platform_device_unregister(cmx270_pcmcia_device);
 107 }