drivers/pcmcia/pxa2xx_stargate2.c

   1 /*
   2  * linux/drivers/pcmcia/pxa2xx_stargate2.c
   3  *
   4  * Stargate 2 PCMCIA specific routines.
   5  *
   6  * Created:     December 6, 2005
   7  * Author:      Ed C. Epp
   8  * Copyright:   Intel Corp 2005
   9  *              Jonathan Cameron <jic23@cam.ac.uk> 2009
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/delay.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/gpio.h>
  23
  24 #include <pcmcia/ss.h>
  25
  26 #include <asm/irq.h>
  27 #include <asm/mach-types.h>
  28
  29 #include "soc_common.h"
  30
  31 #define SG2_S0_POWER_CTL        108
  32 #define SG2_S0_GPIO_RESET       82
  33 #define SG2_S0_GPIO_DETECT      53
  34 #define SG2_S0_GPIO_READY       81
  35
  36 static struct gpio sg2_pcmcia_gpios[] = {
  37         { SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
  38         { SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
  39 };
  40
  41 static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  42 {
  43         skt->stat[SOC_STAT_CD].gpio = SG2_S0_GPIO_DETECT;
  44         skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  45         skt->stat[SOC_STAT_RDY].gpio = SG2_S0_GPIO_READY;
  46         skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
  47         return 0;
  48 }
  49
  50 static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  51                                     struct pcmcia_state *state)
  52 {
  53         state->bvd1   = 0; /* not available - battery detect on card */
  54         state->bvd2   = 0; /* not available */
  55         state->vs_3v  = 1; /* not available - voltage detect for card */
  56         state->vs_Xv  = 0; /* not available */
  57 }
  58
  59 static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  60                                        const socket_state_t *state)
  61 {
  62         /* Enable card power */
  63         switch (state->Vcc) {
  64         case 0:
  65                 /* sets power ctl register high */
  66                 gpio_set_value(SG2_S0_POWER_CTL, 1);
  67                 break;
  68         case 33:
  69         case 50:
  70                 /* sets power control register low (clear) */
  71                 gpio_set_value(SG2_S0_POWER_CTL, 0);
  72                 msleep(100);
  73                 break;
  74         default:
  75                 pr_err("%s(): bad Vcc %u\n",
  76                        __func__, state->Vcc);
  77                 return -1;
  78         }
  79
  80         /* reset */
  81         gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
  82
  83         return 0;
  84 }
  85
  86 static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
  87         .owner                  = THIS_MODULE,
  88         .hw_init                = sg2_pcmcia_hw_init,
  89         .socket_state           = sg2_pcmcia_socket_state,
  90         .configure_socket       = sg2_pcmcia_configure_socket,
  91         .nr                     = 1,
  92 };
  93
  94 static struct platform_device *sg2_pcmcia_device;
  95
  96 static int __init sg2_pcmcia_init(void)
  97 {
  98         int ret;
  99
 100         if (!machine_is_stargate2())
 101                 return -ENODEV;
 102
 103         sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 104         if (!sg2_pcmcia_device)
 105                 return -ENOMEM;
 106
 107         ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 108         if (ret)
 109                 goto error_put_platform_device;
 110
 111         ret = platform_device_add_data(sg2_pcmcia_device,
 112                                        &sg2_pcmcia_ops,
 113                                        sizeof(sg2_pcmcia_ops));
 114         if (ret)
 115                 goto error_free_gpios;
 116
 117         ret = platform_device_add(sg2_pcmcia_device);
 118         if (ret)
 119                 goto error_free_gpios;
 120
 121         return 0;
 122 error_free_gpios:
 123         gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 124 error_put_platform_device:
 125         platform_device_put(sg2_pcmcia_device);
 126
 127         return ret;
 128 }
 129
 130 static void __exit sg2_pcmcia_exit(void)
 131 {
 132         platform_device_unregister(sg2_pcmcia_device);
 133         gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 134 }
 135
 136 fs_initcall(sg2_pcmcia_init);
 137 module_exit(sg2_pcmcia_exit);
 138
 139 MODULE_LICENSE("GPL");
 140 MODULE_ALIAS("platform:pxa2xx-pcmcia");