drivers/pcmcia/pxa2xx_stargate2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/pcmcia/pxa2xx_stargate2.c
   4  *
   5  * Stargate 2 PCMCIA specific routines.
   6  *
   7  * Created:     December 6, 2005
   8  * Author:      Ed C. Epp
   9  * Copyright:   Intel Corp 2005
  10  *              Jonathan Cameron <jic23@cam.ac.uk> 2009
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/gpio.h>
  20
  21 #include <pcmcia/ss.h>
  22
  23 #include <asm/irq.h>
  24 #include <asm/mach-types.h>
  25
  26 #include "soc_common.h"
  27
  28 #define SG2_S0_POWER_CTL        108
  29 #define SG2_S0_GPIO_RESET       82
  30 #define SG2_S0_GPIO_DETECT      53
  31 #define SG2_S0_GPIO_READY       81
  32
  33 static struct gpio sg2_pcmcia_gpios[] = {
  34         { SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
  35         { SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
  36 };
  37
  38 static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  39 {
  40         skt->stat[SOC_STAT_CD].gpio = SG2_S0_GPIO_DETECT;
  41         skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  42         skt->stat[SOC_STAT_RDY].gpio = SG2_S0_GPIO_READY;
  43         skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
  44         return 0;
  45 }
  46
  47 static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  48                                     struct pcmcia_state *state)
  49 {
  50         state->bvd1   = 0; /* not available - battery detect on card */
  51         state->bvd2   = 0; /* not available */
  52         state->vs_3v  = 1; /* not available - voltage detect for card */
  53         state->vs_Xv  = 0; /* not available */
  54 }
  55
  56 static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  57                                        const socket_state_t *state)
  58 {
  59         /* Enable card power */
  60         switch (state->Vcc) {
  61         case 0:
  62                 /* sets power ctl register high */
  63                 gpio_set_value(SG2_S0_POWER_CTL, 1);
  64                 break;
  65         case 33:
  66         case 50:
  67                 /* sets power control register low (clear) */
  68                 gpio_set_value(SG2_S0_POWER_CTL, 0);
  69                 msleep(100);
  70                 break;
  71         default:
  72                 pr_err("%s(): bad Vcc %u\n",
  73                        __func__, state->Vcc);
  74                 return -1;
  75         }
  76
  77         /* reset */
  78         gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
  79
  80         return 0;
  81 }
  82
  83 static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
  84         .owner                  = THIS_MODULE,
  85         .hw_init                = sg2_pcmcia_hw_init,
  86         .socket_state           = sg2_pcmcia_socket_state,
  87         .configure_socket       = sg2_pcmcia_configure_socket,
  88         .nr                     = 1,
  89 };
  90
  91 static struct platform_device *sg2_pcmcia_device;
  92
  93 static int __init sg2_pcmcia_init(void)
  94 {
  95         int ret;
  96
  97         if (!machine_is_stargate2())
  98                 return -ENODEV;
  99
 100         sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 101         if (!sg2_pcmcia_device)
 102                 return -ENOMEM;
 103
 104         ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 105         if (ret)
 106                 goto error_put_platform_device;
 107
 108         ret = platform_device_add_data(sg2_pcmcia_device,
 109                                        &sg2_pcmcia_ops,
 110                                        sizeof(sg2_pcmcia_ops));
 111         if (ret)
 112                 goto error_free_gpios;
 113
 114         ret = platform_device_add(sg2_pcmcia_device);
 115         if (ret)
 116                 goto error_free_gpios;
 117
 118         return 0;
 119 error_free_gpios:
 120         gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 121 error_put_platform_device:
 122         platform_device_put(sg2_pcmcia_device);
 123
 124         return ret;
 125 }
 126
 127 static void __exit sg2_pcmcia_exit(void)
 128 {
 129         platform_device_unregister(sg2_pcmcia_device);
 130         gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 131 }
 132
 133 fs_initcall(sg2_pcmcia_init);
 134 module_exit(sg2_pcmcia_exit);
 135
 136 MODULE_LICENSE("GPL");
 137 MODULE_ALIAS("platform:pxa2xx-pcmcia");