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
  18 #include <asm/mach-types.h>
  19
  20 #include "soc_common.h"
  21
  22 #define GPIO_PCMCIA_S0_CD_VALID (84)
  23 #define GPIO_PCMCIA_S0_RDYINT   (82)
  24 #define GPIO_PCMCIA_RESET       (53)
  25
  26 #define PCMCIA_S0_CD_VALID      IRQ_GPIO(GPIO_PCMCIA_S0_CD_VALID)
  27 #define PCMCIA_S0_RDYINT        IRQ_GPIO(GPIO_PCMCIA_S0_RDYINT)
  28
  29
  30 static struct pcmcia_irqs irqs[] = {
  31         { 0, PCMCIA_S0_CD_VALID, "PCMCIA0 CD" },
  32 };
  33
  34 static int cmx270_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  35 {
  36         int ret = gpio_request(GPIO_PCMCIA_RESET, "PCCard reset");
  37         if (ret)
  38                 return ret;
  39         gpio_direction_output(GPIO_PCMCIA_RESET, 0);
  40
  41         skt->socket.pci_irq = PCMCIA_S0_RDYINT;
  42         ret = soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  43         if (!ret)
  44                 gpio_free(GPIO_PCMCIA_RESET);
  45
  46         return ret;
  47 }
  48
  49 static void cmx270_pcmcia_shutdown(struct soc_pcmcia_socket *skt)
  50 {
  51         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  52         gpio_free(GPIO_PCMCIA_RESET);
  53 }
  54
  55
  56 static void cmx270_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  57                                        struct pcmcia_state *state)
  58 {
  59         state->detect = (gpio_get_value(GPIO_PCMCIA_S0_CD_VALID) == 0) ? 1 : 0;
  60         state->ready  = (gpio_get_value(GPIO_PCMCIA_S0_RDYINT) == 0) ? 0 : 1;
  61         state->bvd1   = 1;
  62         state->bvd2   = 1;
  63         state->vs_3v  = 0;
  64         state->vs_Xv  = 0;
  65         state->wrprot = 0;  /* not available */
  66 }
  67
  68
  69 static int cmx270_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  70                                           const socket_state_t *state)
  71 {
  72         switch (skt->nr) {
  73         case 0:
  74                 if (state->flags & SS_RESET) {
  75                         gpio_set_value(GPIO_PCMCIA_RESET, 1);
  76                         udelay(10);
  77                         gpio_set_value(GPIO_PCMCIA_RESET, 0);
  78                 }
  79                 break;
  80         }
  81
  82         return 0;
  83 }
  84
  85 static struct pcmcia_low_level cmx270_pcmcia_ops __initdata = {
  86         .owner                  = THIS_MODULE,
  87         .hw_init                = cmx270_pcmcia_hw_init,
  88         .hw_shutdown            = cmx270_pcmcia_shutdown,
  89         .socket_state           = cmx270_pcmcia_socket_state,
  90         .configure_socket       = cmx270_pcmcia_configure_socket,
  91         .nr                     = 1,
  92 };
  93
  94 static struct platform_device *cmx270_pcmcia_device;
  95
  96 int __init cmx270_pcmcia_init(void)
  97 {
  98         int ret;
  99
 100         cmx270_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 101
 102         if (!cmx270_pcmcia_device)
 103                 return -ENOMEM;
 104
 105         ret = platform_device_add_data(cmx270_pcmcia_device, &cmx270_pcmcia_ops,
 106                                        sizeof(cmx270_pcmcia_ops));
 107
 108         if (ret == 0) {
 109                 printk(KERN_INFO "Registering cm-x270 PCMCIA interface.\n");
 110                 ret = platform_device_add(cmx270_pcmcia_device);
 111         }
 112
 113         if (ret)
 114                 platform_device_put(cmx270_pcmcia_device);
 115
 116         return ret;
 117 }
 118
 119 void __exit cmx270_pcmcia_exit(void)
 120 {
 121         platform_device_unregister(cmx270_pcmcia_device);
 122 }