alistair23-linux/arch/arm/mach-imx/mx31lite-db.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  LogicPD i.MX31 SOM-LV development board support
 *
 *    Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 *
 *  based on code for other MX31 boards,
 *
 *    Copyright 2005-2007 Freescale Semiconductor
 *    Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
 *    Copyright (C) 2009 Valentin Longchamp, EPFL Mobots group
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <linux/platform_device.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include "board-mx31lite.h"
#include "common.h"
#include "devices-imx31.h"
#include "hardware.h"
#include "iomux-mx3.h"

/*
 * This file contains board-specific initialization routines for the
 * LogicPD i.MX31 SOM-LV development board, aka 'LiteKit'.
 * If you design an own baseboard for the module, use this file as base
 * for support code.
 */

static unsigned int litekit_db_board_pins[] __initdata = {
	/* SDHC1 */
	MX31_PIN_SD1_DATA0__SD1_DATA0,
	MX31_PIN_SD1_DATA1__SD1_DATA1,
	MX31_PIN_SD1_DATA2__SD1_DATA2,
	MX31_PIN_SD1_DATA3__SD1_DATA3,
	MX31_PIN_SD1_CLK__SD1_CLK,
	MX31_PIN_SD1_CMD__SD1_CMD,
};

/* MMC */

static int gpio_det, gpio_wp;

#define MMC_PAD_CFG (PAD_CTL_DRV_MAX | PAD_CTL_SRE_FAST | PAD_CTL_HYS_CMOS | \
		     PAD_CTL_ODE_CMOS)

static int mxc_mmc1_get_ro(struct device *dev)
{
	return gpio_get_value(IOMUX_TO_GPIO(MX31_PIN_GPIO1_6));
}

static int mxc_mmc1_init(struct device *dev,
			 irq_handler_t detect_irq, void *data)
{
	int ret;

	gpio_det = IOMUX_TO_GPIO(MX31_PIN_DCD_DCE1);
	gpio_wp = IOMUX_TO_GPIO(MX31_PIN_GPIO1_6);

	mxc_iomux_set_pad(MX31_PIN_SD1_DATA0,
			  MMC_PAD_CFG | PAD_CTL_PUE_PUD | PAD_CTL_100K_PU);
	mxc_iomux_set_pad(MX31_PIN_SD1_DATA1,
			  MMC_PAD_CFG | PAD_CTL_PUE_PUD | PAD_CTL_100K_PU);
	mxc_iomux_set_pad(MX31_PIN_SD1_DATA2,
			  MMC_PAD_CFG | PAD_CTL_PUE_PUD | PAD_CTL_100K_PU);
	mxc_iomux_set_pad(MX31_PIN_SD1_DATA3,
			  MMC_PAD_CFG | PAD_CTL_PUE_PUD | PAD_CTL_100K_PU);
	mxc_iomux_set_pad(MX31_PIN_SD1_CMD,
			  MMC_PAD_CFG | PAD_CTL_PUE_PUD | PAD_CTL_100K_PU);
	mxc_iomux_set_pad(MX31_PIN_SD1_CLK, MMC_PAD_CFG);

	ret = gpio_request(gpio_det, "MMC detect");
	if (ret)
		return ret;

	ret = gpio_request(gpio_wp, "MMC w/p");
	if (ret)
		goto exit_free_det;

	gpio_direction_input(gpio_det);
	gpio_direction_input(gpio_wp);

	ret = request_irq(gpio_to_irq(IOMUX_TO_GPIO(MX31_PIN_DCD_DCE1)),
			  detect_irq,
			  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
			  "MMC detect", data);
	if (ret)
		goto exit_free_wp;

	return 0;

exit_free_wp:
	gpio_free(gpio_wp);

exit_free_det:
	gpio_free(gpio_det);

	return ret;
}

static void mxc_mmc1_exit(struct device *dev, void *data)
{
	gpio_free(gpio_det);
	gpio_free(gpio_wp);
	free_irq(gpio_to_irq(IOMUX_TO_GPIO(MX31_PIN_DCD_DCE1)), data);
}

static const struct imxmmc_platform_data mmc_pdata __initconst = {
	.get_ro	 = mxc_mmc1_get_ro,
	.init	   = mxc_mmc1_init,
	.exit	   = mxc_mmc1_exit,
};

/* GPIO LEDs */

static const struct gpio_led litekit_leds[] __initconst = {
	{
		.name           = "GPIO0",
		.gpio           = IOMUX_TO_GPIO(MX31_PIN_COMPARE),
		.active_low     = 1,
		.default_state  = LEDS_GPIO_DEFSTATE_OFF,
	},
	{
		.name           = "GPIO1",
		.gpio           = IOMUX_TO_GPIO(MX31_PIN_CAPTURE),
		.active_low     = 1,
		.default_state  = LEDS_GPIO_DEFSTATE_OFF,
	}
};

static const struct gpio_led_platform_data
		litekit_led_platform_data __initconst = {
	.leds           = litekit_leds,
	.num_leds       = ARRAY_SIZE(litekit_leds),
};

void __init mx31lite_db_init(void)
{
	mxc_iomux_setup_multiple_pins(litekit_db_board_pins,
					ARRAY_SIZE(litekit_db_board_pins),
					"development board pins");
	imx31_add_mxc_mmc(0, &mmc_pdata);
	gpio_led_register_device(-1, &litekit_led_platform_data);
	imx31_add_imx2_wdt();
	imx31_add_mxc_rtc();
}