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