drivers/pcmcia/pxa2xx_cm_x255.c

   1 /*
   2  * linux/drivers/pcmcia/pxa/pxa_cm_x255.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_SKTSEL      (54)
  22 #define GPIO_PCMCIA_S0_CD_VALID (16)
  23 #define GPIO_PCMCIA_S1_CD_VALID (17)
  24 #define GPIO_PCMCIA_S0_RDYINT   (6)
  25 #define GPIO_PCMCIA_S1_RDYINT   (8)
  26 #define GPIO_PCMCIA_RESET       (9)
  27
  28 static int cmx255_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  29 {
  30         int ret = gpio_request(GPIO_PCMCIA_RESET, "PCCard reset");
  31         if (ret)
  32                 return ret;
  33         gpio_direction_output(GPIO_PCMCIA_RESET, 0);
  34
  35         if (skt->nr == 0) {
  36                 skt->stat[SOC_STAT_CD].gpio = GPIO_PCMCIA_S0_CD_VALID;
  37                 skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  38                 skt->stat[SOC_STAT_RDY].gpio = GPIO_PCMCIA_S0_RDYINT;
  39                 skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
  40         } else {
  41                 skt->stat[SOC_STAT_CD].gpio = GPIO_PCMCIA_S1_CD_VALID;
  42                 skt->stat[SOC_STAT_CD].name = "PCMCIA1 CD";
  43                 skt->stat[SOC_STAT_RDY].gpio = GPIO_PCMCIA_S1_RDYINT;
  44                 skt->stat[SOC_STAT_RDY].name = "PCMCIA1 RDY";
  45         }
  46
  47         return 0;
  48 }
  49
  50 static void cmx255_pcmcia_shutdown(struct soc_pcmcia_socket *skt)
  51 {
  52         gpio_free(GPIO_PCMCIA_RESET);
  53 }
  54
  55
  56 static void cmx255_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  57                                        struct pcmcia_state *state)
  58 {
  59         state->vs_3v  = 0;
  60         state->vs_Xv  = 0;
  61 }
  62
  63
  64 static int cmx255_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  65                                           const socket_state_t *state)
  66 {
  67         switch (skt->nr) {
  68         case 0:
  69                 if (state->flags & SS_RESET) {
  70                         gpio_set_value(GPIO_PCMCIA_SKTSEL, 0);
  71                         udelay(1);
  72                         gpio_set_value(GPIO_PCMCIA_RESET, 1);
  73                         udelay(10);
  74                         gpio_set_value(GPIO_PCMCIA_RESET, 0);
  75                 }
  76                 break;
  77         case 1:
  78                 if (state->flags & SS_RESET) {
  79                         gpio_set_value(GPIO_PCMCIA_SKTSEL, 1);
  80                         udelay(1);
  81                         gpio_set_value(GPIO_PCMCIA_RESET, 1);
  82                         udelay(10);
  83                         gpio_set_value(GPIO_PCMCIA_RESET, 0);
  84                 }
  85                 break;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static struct pcmcia_low_level cmx255_pcmcia_ops __initdata = {
  92         .owner                  = THIS_MODULE,
  93         .hw_init                = cmx255_pcmcia_hw_init,
  94         .hw_shutdown            = cmx255_pcmcia_shutdown,
  95         .socket_state           = cmx255_pcmcia_socket_state,
  96         .configure_socket       = cmx255_pcmcia_configure_socket,
  97         .nr                     = 1,
  98 };
  99
 100 static struct platform_device *cmx255_pcmcia_device;
 101
 102 int __init cmx255_pcmcia_init(void)
 103 {
 104         int ret;
 105
 106         cmx255_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 107
 108         if (!cmx255_pcmcia_device)
 109                 return -ENOMEM;
 110
 111         ret = platform_device_add_data(cmx255_pcmcia_device, &cmx255_pcmcia_ops,
 112                                        sizeof(cmx255_pcmcia_ops));
 113
 114         if (ret == 0) {
 115                 printk(KERN_INFO "Registering cm-x255 PCMCIA interface.\n");
 116                 ret = platform_device_add(cmx255_pcmcia_device);
 117         }
 118
 119         if (ret)
 120                 platform_device_put(cmx255_pcmcia_device);
 121
 122         return ret;
 123 }
 124
 125 void __exit cmx255_pcmcia_exit(void)
 126 {
 127         platform_device_unregister(cmx255_pcmcia_device);
 128 }