/*
 * arch/arm/mach-ep93xx/vision_ep9307.c
 * Vision Engraving Systems EP9307 SoM support.
 *
 * Copyright (C) 2008-2011 Vision Engraving Systems
 * H Hartley Sweeten <hsweeten@visionengravers.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/mtd/partitions.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/i2c/pca953x.h>
#include <linux/spi/spi.h>
#include <linux/spi/flash.h>
#include <linux/spi/mmc_spi.h>
#include <linux/mmc/host.h>

#include <mach/hardware.h>
#include <mach/fb.h>
#include <mach/ep93xx_spi.h>

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

/*************************************************************************
 * Static I/O mappings for the FPGA
 *************************************************************************/
#define VISION_PHYS_BASE	EP93XX_CS7_PHYS_BASE
#define VISION_VIRT_BASE	0xfebff000

static struct map_desc vision_io_desc[] __initdata = {
	{
		.virtual	= VISION_VIRT_BASE,
		.pfn		= __phys_to_pfn(VISION_PHYS_BASE),
		.length		= SZ_4K,
		.type		= MT_DEVICE,
	},
};

static void __init vision_map_io(void)
{
	ep93xx_map_io();

	iotable_init(vision_io_desc, ARRAY_SIZE(vision_io_desc));
}

/*************************************************************************
 * Ethernet
 *************************************************************************/
static struct ep93xx_eth_data vision_eth_data __initdata = {
	.phy_id		= 1,
};

/*************************************************************************
 * Framebuffer
 *************************************************************************/
#define VISION_LCD_ENABLE	EP93XX_GPIO_LINE_EGPIO1

static int vision_lcd_setup(struct platform_device *pdev)
{
	int err;

	err = gpio_request_one(VISION_LCD_ENABLE, GPIOF_INIT_HIGH,
				dev_name(&pdev->dev));
	if (err)
		return err;

	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_RAS |
				 EP93XX_SYSCON_DEVCFG_RASONP3 |
				 EP93XX_SYSCON_DEVCFG_EXVC);

	return 0;
}

static void vision_lcd_teardown(struct platform_device *pdev)
{
	gpio_free(VISION_LCD_ENABLE);
}

static void vision_lcd_blank(int blank_mode, struct fb_info *info)
{
	if (blank_mode)
		gpio_set_value(VISION_LCD_ENABLE, 0);
	else
		gpio_set_value(VISION_LCD_ENABLE, 1);
}

static struct ep93xxfb_mach_info ep93xxfb_info __initdata = {
	.num_modes	= EP93XXFB_USE_MODEDB,
	.bpp		= 16,
	.flags		= EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
	.setup		= vision_lcd_setup,
	.teardown	= vision_lcd_teardown,
	.blank		= vision_lcd_blank,
};


/*************************************************************************
 * GPIO Expanders
 *************************************************************************/
#define PCA9539_74_GPIO_BASE	(EP93XX_GPIO_LINE_MAX + 1)
#define PCA9539_75_GPIO_BASE	(PCA9539_74_GPIO_BASE + 16)
#define PCA9539_76_GPIO_BASE	(PCA9539_75_GPIO_BASE + 16)
#define PCA9539_77_GPIO_BASE	(PCA9539_76_GPIO_BASE + 16)

static struct pca953x_platform_data pca953x_74_gpio_data = {
	.gpio_base	= PCA9539_74_GPIO_BASE,
	.irq_base	= EP93XX_BOARD_IRQ(0),
};

static struct pca953x_platform_data pca953x_75_gpio_data = {
	.gpio_base	= PCA9539_75_GPIO_BASE,
	.irq_base	= -1,
};

static struct pca953x_platform_data pca953x_76_gpio_data = {
	.gpio_base	= PCA9539_76_GPIO_BASE,
	.irq_base	= -1,
};

static struct pca953x_platform_data pca953x_77_gpio_data = {
	.gpio_base	= PCA9539_77_GPIO_BASE,
	.irq_base	= -1,
};

/*************************************************************************
 * I2C Bus
 *************************************************************************/
static struct i2c_gpio_platform_data vision_i2c_gpio_data __initdata = {
	.sda_pin		= EP93XX_GPIO_LINE_EEDAT,
	.scl_pin		= EP93XX_GPIO_LINE_EECLK,
};

static struct i2c_board_info vision_i2c_info[] __initdata = {
	{
		I2C_BOARD_INFO("isl1208", 0x6f),
		.irq		= IRQ_EP93XX_EXT1,
	}, {
		I2C_BOARD_INFO("pca9539", 0x74),
		.platform_data	= &pca953x_74_gpio_data,
		.irq		= gpio_to_irq(EP93XX_GPIO_LINE_F(7)),
	}, {
		I2C_BOARD_INFO("pca9539", 0x75),
		.platform_data	= &pca953x_75_gpio_data,
	}, {
		I2C_BOARD_INFO("pca9539", 0x76),
		.platform_data	= &pca953x_76_gpio_data,
	}, {
		I2C_BOARD_INFO("pca9539", 0x77),
		.platform_data	= &pca953x_77_gpio_data,
	},
};

/*************************************************************************
 * SPI Flash
 *************************************************************************/
#define VISION_SPI_FLASH_CS	EP93XX_GPIO_LINE_EGPIO7

static struct mtd_partition vision_spi_flash_partitions[] = {
	{
		.name	= "SPI bootstrap",
		.offset	= 0,
		.size	= SZ_4K,
	}, {
		.name	= "Bootstrap config",
		.offset	= MTDPART_OFS_APPEND,
		.size	= SZ_4K,
	}, {
		.name	= "System config",
		.offset	= MTDPART_OFS_APPEND,
		.size	= MTDPART_SIZ_FULL,
	},
};

static struct flash_platform_data vision_spi_flash_data = {
	.name		= "SPI Flash",
	.parts		= vision_spi_flash_partitions,
	.nr_parts	= ARRAY_SIZE(vision_spi_flash_partitions),
};

static int vision_spi_flash_hw_setup(struct spi_device *spi)
{
	return gpio_request_one(VISION_SPI_FLASH_CS, GPIOF_INIT_HIGH,
				spi->modalias);
}

static void vision_spi_flash_hw_cleanup(struct spi_device *spi)
{
	gpio_free(VISION_SPI_FLASH_CS);
}

static void vision_spi_flash_hw_cs_control(struct spi_device *spi, int value)
{
	gpio_set_value(VISION_SPI_FLASH_CS, value);
}

static struct ep93xx_spi_chip_ops vision_spi_flash_hw = {
	.setup		= vision_spi_flash_hw_setup,
	.cleanup	= vision_spi_flash_hw_cleanup,
	.cs_control	= vision_spi_flash_hw_cs_control,
};

/*************************************************************************
 * SPI SD/MMC host
 *************************************************************************/
#define VISION_SPI_MMC_CS	EP93XX_GPIO_LINE_G(2)
#define VISION_SPI_MMC_WP	EP93XX_GPIO_LINE_F(0)
#define VISION_SPI_MMC_CD	EP93XX_GPIO_LINE_EGPIO15

static struct gpio vision_spi_mmc_gpios[] = {
	{ VISION_SPI_MMC_WP, GPIOF_DIR_IN, "mmc_spi:wp" },
	{ VISION_SPI_MMC_CD, GPIOF_DIR_IN, "mmc_spi:cd" },
};

static int vision_spi_mmc_init(struct device *pdev,
			irqreturn_t (*func)(int, void *), void *pdata)
{
	int err;

	err = gpio_request_array(vision_spi_mmc_gpios,
				 ARRAY_SIZE(vision_spi_mmc_gpios));
	if (err)
		return err;

	err = gpio_set_debounce(VISION_SPI_MMC_CD, 1);
	if (err)
		goto exit_err;

	err = request_irq(gpio_to_irq(VISION_SPI_MMC_CD), func,
			IRQ_TYPE_EDGE_BOTH, "mmc_spi:cd", pdata);
	if (err)
		goto exit_err;

	return 0;

exit_err:
	gpio_free_array(vision_spi_mmc_gpios, ARRAY_SIZE(vision_spi_mmc_gpios));
	return err;

}

static void vision_spi_mmc_exit(struct device *pdev, void *pdata)
{
	free_irq(gpio_to_irq(VISION_SPI_MMC_CD), pdata);
	gpio_free_array(vision_spi_mmc_gpios, ARRAY_SIZE(vision_spi_mmc_gpios));
}

static int vision_spi_mmc_get_ro(struct device *pdev)
{
	return !!gpio_get_value(VISION_SPI_MMC_WP);
}

static int vision_spi_mmc_get_cd(struct device *pdev)
{
	return !gpio_get_value(VISION_SPI_MMC_CD);
}

static struct mmc_spi_platform_data vision_spi_mmc_data = {
	.init		= vision_spi_mmc_init,
	.exit		= vision_spi_mmc_exit,
	.get_ro		= vision_spi_mmc_get_ro,
	.get_cd		= vision_spi_mmc_get_cd,
	.detect_delay	= 100,
	.powerup_msecs	= 100,
	.ocr_mask	= MMC_VDD_32_33 | MMC_VDD_33_34,
};

static int vision_spi_mmc_hw_setup(struct spi_device *spi)
{
	return gpio_request_one(VISION_SPI_MMC_CS, GPIOF_INIT_HIGH,
				spi->modalias);
}

static void vision_spi_mmc_hw_cleanup(struct spi_device *spi)
{
	gpio_free(VISION_SPI_MMC_CS);
}

static void vision_spi_mmc_hw_cs_control(struct spi_device *spi, int value)
{
	gpio_set_value(VISION_SPI_MMC_CS, value);
}

static struct ep93xx_spi_chip_ops vision_spi_mmc_hw = {
	.setup		= vision_spi_mmc_hw_setup,
	.cleanup	= vision_spi_mmc_hw_cleanup,
	.cs_control	= vision_spi_mmc_hw_cs_control,
};

/*************************************************************************
 * SPI Bus
 *************************************************************************/
static struct spi_board_info vision_spi_board_info[] __initdata = {
	{
		.modalias		= "sst25l",
		.platform_data		= &vision_spi_flash_data,
		.controller_data	= &vision_spi_flash_hw,
		.max_speed_hz		= 20000000,
		.bus_num		= 0,
		.chip_select		= 0,
		.mode			= SPI_MODE_3,
	}, {
		.modalias		= "mmc_spi",
		.platform_data		= &vision_spi_mmc_data,
		.controller_data	= &vision_spi_mmc_hw,
		.max_speed_hz		= 20000000,
		.bus_num		= 0,
		.chip_select		= 1,
		.mode			= SPI_MODE_3,
	},
};

static struct ep93xx_spi_info vision_spi_master __initdata = {
	.num_chipselect		= ARRAY_SIZE(vision_spi_board_info),
};

/*************************************************************************
 * Machine Initialization
 *************************************************************************/
static void __init vision_init_machine(void)
{
	ep93xx_init_devices();
	ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_64M);
	ep93xx_register_eth(&vision_eth_data, 1);
	ep93xx_register_fb(&ep93xxfb_info);
	ep93xx_register_pwm(1, 0);

	/*
	 * Request the gpio expander's interrupt gpio line now to prevent
	 * the kernel from doing a WARN in gpiolib:gpio_ensure_requested().
	 */
	if (gpio_request_one(EP93XX_GPIO_LINE_F(7), GPIOF_DIR_IN,
				"pca9539:74"))
		pr_warn("cannot request interrupt gpio for pca9539:74\n");

	ep93xx_register_i2c(&vision_i2c_gpio_data, vision_i2c_info,
				ARRAY_SIZE(vision_i2c_info));
	ep93xx_register_spi(&vision_spi_master, vision_spi_board_info,
				ARRAY_SIZE(vision_spi_board_info));
}

MACHINE_START(VISION_EP9307, "Vision Engraving Systems EP9307")
	/* Maintainer: H Hartley Sweeten <hsweeten@visionengravers.com> */
	.atag_offset	= 0x100,
	.map_io		= vision_map_io,
	.init_irq	= ep93xx_init_irq,
	.timer		= &ep93xx_timer,
	.init_machine	= vision_init_machine,
MACHINE_END