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 <asm/mach-types.h>
  20
  21 #include "soc_common.h"
  22
  23 #define GPIO_PCMCIA_S0_CD_VALID (84)
  24 #define GPIO_PCMCIA_S0_RDYINT   (82)
  25 #define GPIO_PCMCIA_RESET       (53)
  26
  27 #define PCMCIA_S0_CD_VALID      IRQ_GPIO(GPIO_PCMCIA_S0_CD_VALID)
  28 #define PCMCIA_S0_RDYINT        IRQ_GPIO(GPIO_PCMCIA_S0_RDYINT)
  29
  30
  31 static struct pcmcia_irqs irqs[] = {
  32         { 0, PCMCIA_S0_CD_VALID, "PCMCIA0 CD" },
  33 };
  34
  35 static int cmx270_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  36 {
  37         int ret = gpio_request(GPIO_PCMCIA_RESET, "PCCard reset");
  38         if (ret)
  39                 return ret;
  40         gpio_direction_output(GPIO_PCMCIA_RESET, 0);
  41
  42         skt->socket.pci_irq = PCMCIA_S0_RDYINT;
  43         ret = soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  44         if (!ret)
  45                 gpio_free(GPIO_PCMCIA_RESET);
  46
  47         return ret;
  48 }
  49
  50 static void cmx270_pcmcia_shutdown(struct soc_pcmcia_socket *skt)
  51 {
  52         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  53         gpio_free(GPIO_PCMCIA_RESET);
  54 }
  55
  56
  57 static void cmx270_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  58                                        struct pcmcia_state *state)
  59 {
  60         state->detect = (gpio_get_value(GPIO_PCMCIA_S0_CD_VALID) == 0) ? 1 : 0;
  61         state->ready  = (gpio_get_value(GPIO_PCMCIA_S0_RDYINT) == 0) ? 0 : 1;
  62         state->bvd1   = 1;
  63         state->bvd2   = 1;
  64         state->vs_3v  = 0;
  65         state->vs_Xv  = 0;
  66         state->wrprot = 0;  /* not available */
  67 }
  68
  69
  70 static int cmx270_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  71                                           const socket_state_t *state)
  72 {
  73         switch (skt->nr) {
  74         case 0:
  75                 if (state->flags & SS_RESET) {
  76                         gpio_set_value(GPIO_PCMCIA_RESET, 1);
  77                         udelay(10);
  78                         gpio_set_value(GPIO_PCMCIA_RESET, 0);
  79                 }
  80                 break;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static struct pcmcia_low_level cmx270_pcmcia_ops __initdata = {
  87         .owner                  = THIS_MODULE,
  88         .hw_init                = cmx270_pcmcia_hw_init,
  89         .hw_shutdown            = cmx270_pcmcia_shutdown,
  90         .socket_state           = cmx270_pcmcia_socket_state,
  91         .configure_socket       = cmx270_pcmcia_configure_socket,
  92         .nr                     = 1,
  93 };
  94
  95 static struct platform_device *cmx270_pcmcia_device;
  96
  97 int __init cmx270_pcmcia_init(void)
  98 {
  99         int ret;
 100
 101         cmx270_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 102
 103         if (!cmx270_pcmcia_device)
 104                 return -ENOMEM;
 105
 106         ret = platform_device_add_data(cmx270_pcmcia_device, &cmx270_pcmcia_ops,
 107                                        sizeof(cmx270_pcmcia_ops));
 108
 109         if (ret == 0) {
 110                 printk(KERN_INFO "Registering cm-x270 PCMCIA interface.\n");
 111                 ret = platform_device_add(cmx270_pcmcia_device);
 112         }
 113
 114         if (ret)
 115                 platform_device_put(cmx270_pcmcia_device);
 116
 117         return ret;
 118 }
 119
 120 void __exit cmx270_pcmcia_exit(void)
 121 {
 122         platform_device_unregister(cmx270_pcmcia_device);
 123 }