drivers/pcmcia/pxa2xx_hx4700.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/platform_device.h>
   8 #include <linux/err.h>
   9 #include <linux/gpio.h>
  10 #include <linux/irq.h>
  11
  12 #include <asm/mach-types.h>
  13 #include <mach/hx4700.h>
  14
  15 #include "soc_common.h"
  16
  17 static struct gpio gpios[] = {
  18         { GPIO114_HX4700_CF_RESET,    GPIOF_OUT_INIT_LOW,   "CF reset"        },
  19         { EGPIO4_CF_3V3_ON,           GPIOF_OUT_INIT_LOW,   "CF 3.3V enable"  },
  20 };
  21
  22 static int hx4700_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  23 {
  24         int ret;
  25
  26         ret = gpio_request_array(gpios, ARRAY_SIZE(gpios));
  27         if (ret)
  28                 goto out;
  29
  30         /*
  31          * IRQ type must be set before soc_pcmcia_hw_init() calls request_irq().
  32          * The asic3 default IRQ type is level trigger low level detect, exactly
  33          * the the signal present on GPIOD4_CF_nCD when a CF card is inserted.
  34          * If the IRQ type is not changed, the asic3 interrupt handler will loop
  35          * repeatedly because it is unable to clear the level trigger interrupt.
  36          */
  37         irq_set_irq_type(gpio_to_irq(GPIOD4_CF_nCD), IRQ_TYPE_EDGE_BOTH);
  38
  39         skt->stat[SOC_STAT_CD].gpio = GPIOD4_CF_nCD;
  40         skt->stat[SOC_STAT_CD].name = "PCMCIA CD";
  41         skt->stat[SOC_STAT_RDY].gpio = GPIO60_HX4700_CF_RNB;
  42         skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
  43
  44 out:
  45         return ret;
  46 }
  47
  48 static void hx4700_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  49 {
  50         gpio_free_array(gpios, ARRAY_SIZE(gpios));
  51 }
  52
  53 static void hx4700_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  54         struct pcmcia_state *state)
  55 {
  56         state->vs_3v = 1;
  57         state->vs_Xv = 0;
  58 }
  59
  60 static int hx4700_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  61         const socket_state_t *state)
  62 {
  63         switch (state->Vcc) {
  64         case 0:
  65                 gpio_set_value(EGPIO4_CF_3V3_ON, 0);
  66                 break;
  67         case 33:
  68                 gpio_set_value(EGPIO4_CF_3V3_ON, 1);
  69                 break;
  70         default:
  71                 printk(KERN_ERR "pcmcia: Unsupported Vcc: %d\n", state->Vcc);
  72                 return -EINVAL;
  73         }
  74
  75         gpio_set_value(GPIO114_HX4700_CF_RESET, (state->flags & SS_RESET) != 0);
  76
  77         return 0;
  78 }
  79
  80 static struct pcmcia_low_level hx4700_pcmcia_ops = {
  81         .owner          = THIS_MODULE,
  82         .nr             = 1,
  83         .hw_init        = hx4700_pcmcia_hw_init,
  84         .hw_shutdown    = hx4700_pcmcia_hw_shutdown,
  85         .socket_state   = hx4700_pcmcia_socket_state,
  86         .configure_socket = hx4700_pcmcia_configure_socket,
  87 };
  88
  89 static struct platform_device *hx4700_pcmcia_device;
  90
  91 static int __init hx4700_pcmcia_init(void)
  92 {
  93         struct platform_device *pdev;
  94
  95         if (!machine_is_h4700())
  96                 return -ENODEV;
  97
  98         pdev = platform_device_register_data(NULL, "pxa2xx-pcmcia", -1,
  99                 &hx4700_pcmcia_ops, sizeof(hx4700_pcmcia_ops));
 100         if (IS_ERR(pdev))
 101                 return PTR_ERR(pdev);
 102
 103         hx4700_pcmcia_device = pdev;
 104
 105         return 0;
 106 }
 107
 108 static void __exit hx4700_pcmcia_exit(void)
 109 {
 110         platform_device_unregister(hx4700_pcmcia_device);
 111 }
 112
 113 module_init(hx4700_pcmcia_init);
 114 module_exit(hx4700_pcmcia_exit);
 115
 116 MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
 117 MODULE_DESCRIPTION("HP iPAQ hx4700 PCMCIA driver");
 118 MODULE_LICENSE("GPL");