arch/arm/mach-omap2/common-board-devices.c

/*
 * common-board-devices.c
 *
 * Copyright (C) 2011 CompuLab, Ltd.
 * Author: Mike Rapoport <mike@compulab.co.il>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/ads7846.h>

#include <plat/mcspi.h>
#include <plat/nand.h>

#include "common-board-devices.h"

#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
	defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
static struct omap2_mcspi_device_config ads7846_mcspi_config = {
	.turbo_mode	= 0,
};

/*
 * ADS7846 driver maybe request a gpio according to the value
 * of pdata->get_pendown_state, but we have done this. So set
 * get_pendown_state to avoid twice gpio requesting.
 */
static int omap3_get_pendown_state(void)
{
	return !gpio_get_value(OMAP3_EVM_TS_GPIO);
}

static struct ads7846_platform_data ads7846_config = {
	.x_max			= 0x0fff,
	.y_max			= 0x0fff,
	.x_plate_ohms		= 180,
	.pressure_max		= 255,
	.debounce_max		= 10,
	.debounce_tol		= 3,
	.debounce_rep		= 1,
	.gpio_pendown		= -EINVAL,
	.keep_vref_on		= 1,
	.get_pendown_state	= &omap3_get_pendown_state,
};

static struct spi_board_info ads7846_spi_board_info __initdata = {
	.modalias		= "ads7846",
	.bus_num		= -EINVAL,
	.chip_select		= 0,
	.max_speed_hz		= 1500000,
	.controller_data	= &ads7846_mcspi_config,
	.irq			= -EINVAL,
	.platform_data		= &ads7846_config,
};

void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
			      struct ads7846_platform_data *board_pdata)
{
	struct spi_board_info *spi_bi = &ads7846_spi_board_info;
	int err;

	if (gpio_pendown) {
		err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
		if (err) {
			pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
			return;
		}

		/* TS GPIOPendown doesn't allow user to change the direction */
		gpio_export(gpio_pendown, false);

		/* Set proper debouce time for ads7846. */
		if (gpio_debounce)
			gpio_set_debounce(gpio_pendown, gpio_debounce);
	}

	spi_bi->bus_num	= bus_num;
	spi_bi->irq	= gpio_to_irq(gpio_pendown);

	if (board_pdata) {
		board_pdata->gpio_pendown = gpio_pendown;
		spi_bi->platform_data = board_pdata;
	} else {
		ads7846_config.gpio_pendown = gpio_pendown;
	}

	spi_register_board_info(&ads7846_spi_board_info, 1);
}
#else
void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
			      struct ads7846_platform_data *board_pdata)
{
}
#endif

#if defined(CONFIG_MTD_NAND_OMAP2) || defined(CONFIG_MTD_NAND_OMAP2_MODULE)
static struct omap_nand_platform_data nand_data;

void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
				 int nr_parts)
{
	u8 cs = 0;
	u8 nandcs = GPMC_CS_NUM + 1;

	/* find out the chip-select on which NAND exists */
	while (cs < GPMC_CS_NUM) {
		u32 ret = 0;
		ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);

		if ((ret & 0xC00) == 0x800) {
			printk(KERN_INFO "Found NAND on CS%d\n", cs);
			if (nandcs > GPMC_CS_NUM)
				nandcs = cs;
		}
		cs++;
	}

	if (nandcs > GPMC_CS_NUM) {
		printk(KERN_INFO "NAND: Unable to find configuration "
				 "in GPMC\n ");
		return;
	}

	if (nandcs < GPMC_CS_NUM) {
		nand_data.cs = nandcs;
		nand_data.parts = parts;
		nand_data.nr_parts = nr_parts;
		nand_data.devsize = options;

		printk(KERN_INFO "Registering NAND on CS%d\n", nandcs);
		if (gpmc_nand_init(&nand_data) < 0)
			printk(KERN_ERR "Unable to register NAND device\n");
	}
}
#else
void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
				 int nr_parts)
{
}
#endif