arch/arm/mach-mx3/mx31moboard-marxbot.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/hardware.h>
  27 #include <mach/imx-uart.h>
  28 #include <mach/iomux-mx3.h>
  29 #include <mach/mmc.h>
  30
  31 #include "devices.h"
  32
  33 static unsigned int marxbot_pins[] = {
  34         /* SDHC2 */
  35         MX31_PIN_PC_PWRON__SD2_DATA3, MX31_PIN_PC_VS1__SD2_DATA2,
  36         MX31_PIN_PC_READY__SD2_DATA1, MX31_PIN_PC_WAIT_B__SD2_DATA0,
  37         MX31_PIN_PC_CD2_B__SD2_CLK, MX31_PIN_PC_CD1_B__SD2_CMD,
  38         MX31_PIN_ATA_DIOR__GPIO3_28, MX31_PIN_ATA_DIOW__GPIO3_29,
  39         /* CSI */
  40         MX31_PIN_CSI_D4__CSI_D4, MX31_PIN_CSI_D5__CSI_D5,
  41         MX31_PIN_CSI_D6__CSI_D6, MX31_PIN_CSI_D7__CSI_D7,
  42         MX31_PIN_CSI_D8__CSI_D8, MX31_PIN_CSI_D9__CSI_D9,
  43         MX31_PIN_CSI_D10__CSI_D10, MX31_PIN_CSI_D11__CSI_D11,
  44         MX31_PIN_CSI_D12__CSI_D12, MX31_PIN_CSI_D13__CSI_D13,
  45         MX31_PIN_CSI_D14__CSI_D14, MX31_PIN_CSI_D15__CSI_D15,
  46         MX31_PIN_CSI_HSYNC__CSI_HSYNC, MX31_PIN_CSI_MCLK__CSI_MCLK,
  47         MX31_PIN_CSI_PIXCLK__CSI_PIXCLK, MX31_PIN_CSI_VSYNC__CSI_VSYNC,
  48         MX31_PIN_GPIO3_0__GPIO3_0, MX31_PIN_GPIO3_1__GPIO3_1,
  49         MX31_PIN_TXD2__GPIO1_28,
  50         /* dsPIC resets */
  51         MX31_PIN_STXD5__GPIO1_21, MX31_PIN_SRXD5__GPIO1_22,
  52 };
  53
  54 #define SDHC2_CD IOMUX_TO_GPIO(MX31_PIN_ATA_DIOR)
  55 #define SDHC2_WP IOMUX_TO_GPIO(MX31_PIN_ATA_DIOW)
  56
  57 static int marxbot_sdhc2_get_ro(struct device *dev)
  58 {
  59         return !gpio_get_value(SDHC2_WP);
  60 }
  61
  62 static int marxbot_sdhc2_init(struct device *dev, irq_handler_t detect_irq,
  63                 void *data)
  64 {
  65         int ret;
  66
  67         ret = gpio_request(SDHC2_CD, "sdhc-detect");
  68         if (ret)
  69                 return ret;
  70
  71         gpio_direction_input(SDHC2_CD);
  72
  73         ret = gpio_request(SDHC2_WP, "sdhc-wp");
  74         if (ret)
  75                 goto err_gpio_free;
  76         gpio_direction_input(SDHC2_WP);
  77
  78         ret = request_irq(gpio_to_irq(SDHC2_CD), detect_irq,
  79                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  80                 "sdhc2-card-detect", data);
  81         if (ret)
  82                 goto err_gpio_free_2;
  83
  84         return 0;
  85
  86 err_gpio_free_2:
  87         gpio_free(SDHC2_WP);
  88 err_gpio_free:
  89         gpio_free(SDHC2_CD);
  90
  91         return ret;
  92 }
  93
  94 static void marxbot_sdhc2_exit(struct device *dev, void *data)
  95 {
  96         free_irq(gpio_to_irq(SDHC2_CD), data);
  97         gpio_free(SDHC2_WP);
  98         gpio_free(SDHC2_CD);
  99 }
 100
 101 static struct imxmmc_platform_data sdhc2_pdata = {
 102         .get_ro = marxbot_sdhc2_get_ro,
 103         .init   = marxbot_sdhc2_init,
 104         .exit   = marxbot_sdhc2_exit,
 105 };
 106
 107 #define TRSLAT_RST_B    IOMUX_TO_GPIO(MX31_PIN_STXD5)
 108 #define DSPICS_RST_B    IOMUX_TO_GPIO(MX31_PIN_SRXD5)
 109
 110 static void dspics_resets_init(void)
 111 {
 112         if (!gpio_request(TRSLAT_RST_B, "translator-rst")) {
 113                 gpio_direction_output(TRSLAT_RST_B, 1);
 114                 gpio_export(TRSLAT_RST_B, false);
 115         }
 116
 117         if (!gpio_request(DSPICS_RST_B, "dspics-rst")) {
 118                 gpio_direction_output(DSPICS_RST_B, 1);
 119                 gpio_export(DSPICS_RST_B, false);
 120         }
 121 }
 122
 123 /*
 124  * system init for baseboard usage. Will be called by mx31moboard init.
 125  */
 126 void __init mx31moboard_marxbot_init(void)
 127 {
 128         printk(KERN_INFO "Initializing mx31marxbot peripherals\n");
 129
 130         mxc_iomux_setup_multiple_pins(marxbot_pins, ARRAY_SIZE(marxbot_pins),
 131                 "marxbot");
 132
 133         dspics_resets_init();
 134
 135         mxc_register_device(&mxcsdhc_device1, &sdhc2_pdata);
 136 }