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_BUFF_CTL         120
  32 #define SG2_S0_POWER_CTL        108
  33 #define SG2_S0_GPIO_RESET       82
  34 #define SG2_S0_GPIO_DETECT      53
  35 #define SG2_S0_GPIO_READY       81
  36
  37 static struct pcmcia_irqs irqs[] = {
  38         { 0, IRQ_GPIO(SG2_S0_GPIO_DETECT), "PCMCIA0 CD" },
  39 };
  40
  41 static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  42 {
  43         skt->socket.pci_irq = IRQ_GPIO(SG2_S0_GPIO_READY);
  44         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  45 }
  46
  47 static void sg2_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  48 {
  49         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  50 }
  51
  52 static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  53                                     struct pcmcia_state *state)
  54 {
  55         state->detect = !gpio_get_value(SG2_S0_GPIO_DETECT);
  56         state->ready  = !!gpio_get_value(SG2_S0_GPIO_READY);
  57         state->bvd1   = 0; /* not available - battery detect on card */
  58         state->bvd2   = 0; /* not available */
  59         state->vs_3v  = 1; /* not available - voltage detect for card */
  60         state->vs_Xv  = 0; /* not available */
  61         state->wrprot = 0; /* not available - write protect */
  62 }
  63
  64 static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  65                                        const socket_state_t *state)
  66 {
  67         /* Enable card power */
  68         switch (state->Vcc) {
  69         case 0:
  70                 /* sets power ctl register high */
  71                 gpio_set_value(SG2_S0_POWER_CTL, 1);
  72                 break;
  73         case 33:
  74         case 50:
  75                 /* sets power control register low (clear) */
  76                 gpio_set_value(SG2_S0_POWER_CTL, 0);
  77                 msleep(100);
  78                 break;
  79         default:
  80                 pr_err("%s(): bad Vcc %u\n",
  81                        __func__, state->Vcc);
  82                 return -1;
  83         }
  84
  85         /* reset */
  86         gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
  87
  88         return 0;
  89 }
  90
  91 static void sg2_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
  92 {
  93         soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
  94 }
  95
  96 static void sg2_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
  97 {
  98         soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
  99 }
 100
 101 static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
 102         .owner                  = THIS_MODULE,
 103         .hw_init                = sg2_pcmcia_hw_init,
 104         .hw_shutdown            = sg2_pcmcia_hw_shutdown,
 105         .socket_state           = sg2_pcmcia_socket_state,
 106         .configure_socket       = sg2_pcmcia_configure_socket,
 107         .socket_init            = sg2_pcmcia_socket_init,
 108         .socket_suspend         = sg2_pcmcia_socket_suspend,
 109         .nr                     = 1,
 110 };
 111
 112 static struct platform_device *sg2_pcmcia_device;
 113
 114 static int __init sg2_pcmcia_init(void)
 115 {
 116         int ret;
 117
 118         if (!machine_is_stargate2())
 119                 return -ENODEV;
 120
 121         sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 122         if (!sg2_pcmcia_device)
 123                 return -ENOMEM;
 124
 125         ret = gpio_request(SG2_S0_BUFF_CTL, "SG2 CF buff ctl");
 126         if (ret)
 127                 goto error_put_platform_device;
 128         ret = gpio_request(SG2_S0_POWER_CTL, "SG2 CF power ctl");
 129         if (ret)
 130                 goto error_free_gpio_buff_ctl;
 131         ret = gpio_request(SG2_S0_GPIO_RESET, "SG2 CF reset");
 132         if (ret)
 133                 goto error_free_gpio_power_ctl;
 134         /* Set gpio directions */
 135         gpio_direction_output(SG2_S0_BUFF_CTL, 0);
 136         gpio_direction_output(SG2_S0_POWER_CTL, 1);
 137         gpio_direction_output(SG2_S0_GPIO_RESET, 1);
 138
 139         ret = platform_device_add_data(sg2_pcmcia_device,
 140                                        &sg2_pcmcia_ops,
 141                                        sizeof(sg2_pcmcia_ops));
 142         if (ret)
 143                 goto error_free_gpio_reset;
 144
 145         ret = platform_device_add(sg2_pcmcia_device);
 146         if (ret)
 147                 goto error_free_gpio_reset;
 148
 149         return 0;
 150 error_free_gpio_reset:
 151         gpio_free(SG2_S0_GPIO_RESET);
 152 error_free_gpio_power_ctl:
 153         gpio_free(SG2_S0_POWER_CTL);
 154 error_free_gpio_buff_ctl:
 155         gpio_free(SG2_S0_BUFF_CTL);
 156 error_put_platform_device:
 157         platform_device_put(sg2_pcmcia_device);
 158
 159         return ret;
 160 }
 161
 162 static void __exit sg2_pcmcia_exit(void)
 163 {
 164         platform_device_unregister(sg2_pcmcia_device);
 165         gpio_free(SG2_S0_BUFF_CTL);
 166         gpio_free(SG2_S0_POWER_CTL);
 167         gpio_free(SG2_S0_GPIO_RESET);
 168 }
 169
 170 fs_initcall(sg2_pcmcia_init);
 171 module_exit(sg2_pcmcia_exit);
 172
 173 MODULE_LICENSE("GPL");
 174 MODULE_ALIAS("platform:pxa2xx-pcmcia");