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 pcmcia_irqs irqs[] = {
  37         {.sock = 0, .str = "PCMCIA0 CD" },
  38 };
  39
  40 static struct gpio sg2_pcmcia_gpios[] = {
  41         { SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
  42         { SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
  43 };
  44
  45 static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  46 {
  47         skt->socket.pci_irq = gpio_to_irq(SG2_S0_GPIO_READY);
  48         irqs[0].irq = gpio_to_irq(SG2_S0_GPIO_DETECT);
  49
  50         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  51 }
  52
  53 static void sg2_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  54 {
  55         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  56 }
  57
  58 static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  59                                     struct pcmcia_state *state)
  60 {
  61         state->detect = !gpio_get_value(SG2_S0_GPIO_DETECT);
  62         state->ready  = !!gpio_get_value(SG2_S0_GPIO_READY);
  63         state->bvd1   = 0; /* not available - battery detect on card */
  64         state->bvd2   = 0; /* not available */
  65         state->vs_3v  = 1; /* not available - voltage detect for card */
  66         state->vs_Xv  = 0; /* not available */
  67         state->wrprot = 0; /* not available - write protect */
  68 }
  69
  70 static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  71                                        const socket_state_t *state)
  72 {
  73         /* Enable card power */
  74         switch (state->Vcc) {
  75         case 0:
  76                 /* sets power ctl register high */
  77                 gpio_set_value(SG2_S0_POWER_CTL, 1);
  78                 break;
  79         case 33:
  80         case 50:
  81                 /* sets power control register low (clear) */
  82                 gpio_set_value(SG2_S0_POWER_CTL, 0);
  83                 msleep(100);
  84                 break;
  85         default:
  86                 pr_err("%s(): bad Vcc %u\n",
  87                        __func__, state->Vcc);
  88                 return -1;
  89         }
  90
  91         /* reset */
  92         gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
  93
  94         return 0;
  95 }
  96
  97 static void sg2_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
  98 {
  99         soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
 100 }
 101
 102 static void sg2_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 103 {
 104         soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
 105 }
 106
 107 static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
 108         .owner                  = THIS_MODULE,
 109         .hw_init                = sg2_pcmcia_hw_init,
 110         .hw_shutdown            = sg2_pcmcia_hw_shutdown,
 111         .socket_state           = sg2_pcmcia_socket_state,
 112         .configure_socket       = sg2_pcmcia_configure_socket,
 113         .socket_init            = sg2_pcmcia_socket_init,
 114         .socket_suspend         = sg2_pcmcia_socket_suspend,
 115         .nr                     = 1,
 116 };
 117
 118 static struct platform_device *sg2_pcmcia_device;
 119
 120 static int __init sg2_pcmcia_init(void)
 121 {
 122         int ret;
 123
 124         if (!machine_is_stargate2())
 125                 return -ENODEV;
 126
 127         sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 128         if (!sg2_pcmcia_device)
 129                 return -ENOMEM;
 130
 131         ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 132         if (ret)
 133                 goto error_put_platform_device;
 134
 135         ret = platform_device_add_data(sg2_pcmcia_device,
 136                                        &sg2_pcmcia_ops,
 137                                        sizeof(sg2_pcmcia_ops));
 138         if (ret)
 139                 goto error_free_gpios;
 140
 141         ret = platform_device_add(sg2_pcmcia_device);
 142         if (ret)
 143                 goto error_free_gpios;
 144
 145         return 0;
 146 error_free_gpios:
 147         gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 148 error_put_platform_device:
 149         platform_device_put(sg2_pcmcia_device);
 150
 151         return ret;
 152 }
 153
 154 static void __exit sg2_pcmcia_exit(void)
 155 {
 156         platform_device_unregister(sg2_pcmcia_device);
 157         gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 158 }
 159
 160 fs_initcall(sg2_pcmcia_init);
 161 module_exit(sg2_pcmcia_exit);
 162
 163 MODULE_LICENSE("GPL");
 164 MODULE_ALIAS("platform:pxa2xx-pcmcia");