arch/arm/mach-mx3/mx31moboard-devboard.c

   1 /*
   2  * Copyright (C) 2009 Valentin Longchamp, EPFL Mobots group
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include <linux/gpio.h>
  20 #include <linux/init.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/types.h>
  24
  25 #include <mach/common.h>
  26 #include <mach/imx-uart.h>
  27 #include <mach/iomux-mx3.h>
  28 #include <mach/hardware.h>
  29 #include <mach/mmc.h>
  30
  31 #include "devices.h"
  32
  33 static unsigned int devboard_pins[] = {
  34         /* UART1 */
  35         MX31_PIN_CTS2__CTS2, MX31_PIN_RTS2__RTS2,
  36         MX31_PIN_TXD2__TXD2, MX31_PIN_RXD2__RXD2,
  37         /* SDHC2 */
  38         MX31_PIN_PC_PWRON__SD2_DATA3, MX31_PIN_PC_VS1__SD2_DATA2,
  39         MX31_PIN_PC_READY__SD2_DATA1, MX31_PIN_PC_WAIT_B__SD2_DATA0,
  40         MX31_PIN_PC_CD2_B__SD2_CLK, MX31_PIN_PC_CD1_B__SD2_CMD,
  41         MX31_PIN_ATA_DIOR__GPIO3_28, MX31_PIN_ATA_DIOW__GPIO3_29,
  42 };
  43
  44 static struct imxuart_platform_data uart_pdata = {
  45         .flags = IMXUART_HAVE_RTSCTS,
  46 };
  47
  48 #define SDHC2_CD IOMUX_TO_GPIO(MX31_PIN_ATA_DIOR)
  49 #define SDHC2_WP IOMUX_TO_GPIO(MX31_PIN_ATA_DIOW)
  50
  51 static int devboard_sdhc2_get_ro(struct device *dev)
  52 {
  53         return !gpio_get_value(SDHC2_WP);
  54 }
  55
  56 static int devboard_sdhc2_init(struct device *dev, irq_handler_t detect_irq,
  57                 void *data)
  58 {
  59         int ret;
  60
  61         ret = gpio_request(SDHC2_CD, "sdhc-detect");
  62         if (ret)
  63                 return ret;
  64
  65         gpio_direction_input(SDHC2_CD);
  66
  67         ret = gpio_request(SDHC2_WP, "sdhc-wp");
  68         if (ret)
  69                 goto err_gpio_free;
  70         gpio_direction_input(SDHC2_WP);
  71
  72         ret = request_irq(gpio_to_irq(SDHC2_CD), detect_irq,
  73                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  74                 "sdhc2-card-detect", data);
  75         if (ret)
  76                 goto err_gpio_free_2;
  77
  78         return 0;
  79
  80 err_gpio_free_2:
  81         gpio_free(SDHC2_WP);
  82 err_gpio_free:
  83         gpio_free(SDHC2_CD);
  84
  85         return ret;
  86 }
  87
  88 static void devboard_sdhc2_exit(struct device *dev, void *data)
  89 {
  90         free_irq(gpio_to_irq(SDHC2_CD), data);
  91         gpio_free(SDHC2_WP);
  92         gpio_free(SDHC2_CD);
  93 }
  94
  95 static struct imxmmc_platform_data sdhc2_pdata = {
  96         .get_ro = devboard_sdhc2_get_ro,
  97         .init   = devboard_sdhc2_init,
  98         .exit   = devboard_sdhc2_exit,
  99 };
 100
 101 /*
 102  * system init for baseboard usage. Will be called by mx31moboard init.
 103  */
 104 void __init mx31moboard_devboard_init(void)
 105 {
 106         printk(KERN_INFO "Initializing mx31devboard peripherals\n");
 107
 108         mxc_iomux_setup_multiple_pins(devboard_pins, ARRAY_SIZE(devboard_pins),
 109                 "devboard");
 110
 111         mxc_register_device(&mxc_uart_device1, &uart_pdata);
 112
 113         mxc_register_device(&mxcsdhc_device1, &sdhc2_pdata);
 114 }