// SPDX-License-Identifier: GPL-2.0
/*
 * arch/arm/mach-ixp4xx/nas100d-setup.c
 *
 * NAS 100d board-setup
 *
 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
 *
 * based on ixdp425-setup.c:
 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
 * based on nas100d-power.c:
 *      Copyright (C) 2005 Tower Technologies
 * based on nas100d-io.c
 *      Copyright (C) 2004 Karen Spearel
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Author: Rod Whitby <rod@whitby.id.au>
 * Maintainers: http://www.nslu2-linux.org/
 *
 */
#include <linux/gpio.h>
#include <linux/if_ether.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/leds.h>
#include <linux/reboot.h>
#include <linux/i2c.h>
#include <linux/gpio/machine.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>

#include "irqs.h"

#define NAS100D_SDA_PIN         5
#define NAS100D_SCL_PIN         6

/* Buttons */
#define NAS100D_PB_GPIO         14   /* power button */
#define NAS100D_RB_GPIO         4    /* reset button */

/* Power control */
#define NAS100D_PO_GPIO         12   /* power off */

/* LEDs */
#define NAS100D_LED_WLAN_GPIO   0
#define NAS100D_LED_DISK_GPIO   3
#define NAS100D_LED_PWR_GPIO    15

static struct flash_platform_data nas100d_flash_data = {
        .map_name               = "cfi_probe",
        .width                  = 2,
};

static struct resource nas100d_flash_resource = {
        .flags                  = IORESOURCE_MEM,
};

static struct platform_device nas100d_flash = {
        .name                   = "IXP4XX-Flash",
        .id                     = 0,
        .dev.platform_data      = &nas100d_flash_data,
        .num_resources          = 1,
        .resource               = &nas100d_flash_resource,
};

static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
        {
                I2C_BOARD_INFO("pcf8563", 0x51),
        },
};

static struct gpio_led nas100d_led_pins[] = {
        {
                .name           = "nas100d:green:wlan",
                .gpio           = NAS100D_LED_WLAN_GPIO,
                .active_low     = true,
        },
        {
                .name           = "nas100d:blue:power",  /* (off=flashing) */
                .gpio           = NAS100D_LED_PWR_GPIO,
                .active_low     = true,
        },
        {
                .name           = "nas100d:yellow:disk",
                .gpio           = NAS100D_LED_DISK_GPIO,
                .active_low     = true,
        },
};

static struct gpio_led_platform_data nas100d_led_data = {
        .num_leds               = ARRAY_SIZE(nas100d_led_pins),
        .leds                   = nas100d_led_pins,
};

static struct platform_device nas100d_leds = {
        .name                   = "leds-gpio",
        .id                     = -1,
        .dev.platform_data      = &nas100d_led_data,
};

static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
        .dev_id         = "i2c-gpio.0",
        .table          = {
                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
                                NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
                                NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
        },
};

static struct platform_device nas100d_i2c_gpio = {
        .name                   = "i2c-gpio",
        .id                     = 0,
        .dev     = {
                .platform_data  = NULL,
        },
};

static struct resource nas100d_uart_resources[] = {
        {
                .start          = IXP4XX_UART1_BASE_PHYS,
                .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
                .flags          = IORESOURCE_MEM,
        },
        {
                .start          = IXP4XX_UART2_BASE_PHYS,
                .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
                .flags          = IORESOURCE_MEM,
        }
};

static struct plat_serial8250_port nas100d_uart_data[] = {
        {
                .mapbase        = IXP4XX_UART1_BASE_PHYS,
                .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
                .irq            = IRQ_IXP4XX_UART1,
                .flags          = UPF_BOOT_AUTOCONF,
                .iotype         = UPIO_MEM,
                .regshift       = 2,
                .uartclk        = IXP4XX_UART_XTAL,
        },
        {
                .mapbase        = IXP4XX_UART2_BASE_PHYS,
                .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
                .irq            = IRQ_IXP4XX_UART2,
                .flags          = UPF_BOOT_AUTOCONF,
                .iotype         = UPIO_MEM,
                .regshift       = 2,
                .uartclk        = IXP4XX_UART_XTAL,
        },
        { }
};

static struct platform_device nas100d_uart = {
        .name                   = "serial8250",
        .id                     = PLAT8250_DEV_PLATFORM,
        .dev.platform_data      = nas100d_uart_data,
        .num_resources          = 2,
        .resource               = nas100d_uart_resources,
};

/* Built-in 10/100 Ethernet MAC interfaces */
static struct eth_plat_info nas100d_plat_eth[] = {
        {
                .phy            = 0,
                .rxq            = 3,
                .txreadyq       = 20,
        }
};

static struct platform_device nas100d_eth[] = {
        {
                .name                   = "ixp4xx_eth",
                .id                     = IXP4XX_ETH_NPEB,
                .dev.platform_data      = nas100d_plat_eth,
        }
};

static struct platform_device *nas100d_devices[] __initdata = {
        &nas100d_i2c_gpio,
        &nas100d_flash,
        &nas100d_leds,
        &nas100d_eth[0],
};

static void nas100d_power_off(void)
{
        /* This causes the box to drop the power and go dead. */

        /* enable the pwr cntl gpio and assert power off */
        gpio_direction_output(NAS100D_PO_GPIO, 1);
}

/* This is used to make sure the power-button pusher is serious.  The button
 * must be held until the value of this counter reaches zero.
 */
static int power_button_countdown;

/* Must hold the button down for at least this many counts to be processed */
#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */

static void nas100d_power_handler(struct timer_list *unused);
static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);

static void nas100d_power_handler(struct timer_list *unused)
{
        /* This routine is called twice per second to check the
         * state of the power button.
         */

        if (gpio_get_value(NAS100D_PB_GPIO)) {

                /* IO Pin is 1 (button pushed) */
                if (power_button_countdown > 0)
                        power_button_countdown--;

        } else {

                /* Done on button release, to allow for auto-power-on mods. */
                if (power_button_countdown == 0) {
                        /* Signal init to do the ctrlaltdel action,
                         * this will bypass init if it hasn't started
                         * and do a kernel_restart.
                         */
                        ctrl_alt_del();

                        /* Change the state of the power LED to "blink" */
                        gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
                } else {
                        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
                }
        }

        mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
}

static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
{
        /* This is the paper-clip reset, it shuts the machine down directly. */
        machine_power_off();

        return IRQ_HANDLED;
}

static int __init nas100d_gpio_init(void)
{
        if (!machine_is_nas100d())
                return 0;

        /*
         * The power button on the Iomega NAS100d is on GPIO 14, but
         * it cannot handle interrupts on that GPIO line.  So we'll
         * have to poll it with a kernel timer.
         */

        /* Request the power off GPIO */
        gpio_request(NAS100D_PO_GPIO, "power off");

        /* Make sure that the power button GPIO is set up as an input */
        gpio_request(NAS100D_PB_GPIO, "power button");
        gpio_direction_input(NAS100D_PB_GPIO);

        /* Set the initial value for the power button IRQ handler */
        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;

        mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));

        return 0;
}
device_initcall(nas100d_gpio_init);

static void __init nas100d_init(void)
{
        uint8_t __iomem *f;
        int i;

        ixp4xx_sys_init();

        nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
        nas100d_flash_resource.end =
                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;

        gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
        i2c_register_board_info(0, nas100d_i2c_board_info,
                                ARRAY_SIZE(nas100d_i2c_board_info));

        /*
         * This is only useful on a modified machine, but it is valuable
         * to have it first in order to see debug messages, and so that
         * it does *not* get removed if platform_add_devices fails!
         */
        (void)platform_device_register(&nas100d_uart);

        platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));

        pm_power_off = nas100d_power_off;

        if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
                IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {

                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
                        gpio_to_irq(NAS100D_RB_GPIO));
        }

        /*
         * Map in a portion of the flash and read the MAC address.
         * Since it is stored in BE in the flash itself, we need to
         * byteswap it if we're in LE mode.
         */
        f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
        if (f) {
                for (i = 0; i < 6; i++)
#ifdef __ARMEB__
                        nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
#else
                        nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
#endif
                iounmap(f);
        }
        printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
               nas100d_plat_eth[0].hwaddr);

}

MACHINE_START(NAS100D, "Iomega NAS 100d")
        /* Maintainer: www.nslu2-linux.org */
        .atag_offset    = 0x100,
        .map_io         = ixp4xx_map_io,
        .init_early     = ixp4xx_init_early,
        .init_irq       = ixp4xx_init_irq,
        .init_time      = ixp4xx_timer_init,
        .init_machine   = nas100d_init,
#if defined(CONFIG_PCI)
        .dma_zone_size  = SZ_64M,
#endif
        .restart        = ixp4xx_restart,
MACHINE_END