// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/arch/arm/mach-omap1/board-ams-delta.c
 *
 * Modified from board-generic.c
 *
 * Board specific inits for the Amstrad E3 (codename Delta) videophone
 *
 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
 */
#include <linux/gpio/driver.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/leds.h>
#include <linux/mtd/nand-gpio.h>
#include <linux/mtd/partitions.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/fixed.h>
#include <linux/regulator/machine.h>
#include <linux/serial_8250.h>
#include <linux/export.h>
#include <linux/omapfb.h>
#include <linux/io.h>
#include <linux/platform_data/gpio-omap.h>

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

#include <linux/platform_data/keypad-omap.h>
#include <mach/mux.h>

#include <mach/hardware.h>
#include <mach/usb.h>

#include "ams-delta-fiq.h"
#include "board-ams-delta.h"
#include "iomap.h"
#include "common.h"

static const unsigned int ams_delta_keymap[] = {
        KEY(0, 0, KEY_F1),              /* Advert    */

        KEY(0, 3, KEY_COFFEE),          /* Games     */
        KEY(0, 2, KEY_QUESTION),        /* Directory */
        KEY(2, 3, KEY_CONNECT),         /* Internet  */
        KEY(1, 2, KEY_SHOP),            /* Services  */
        KEY(1, 1, KEY_PHONE),           /* VoiceMail */

        KEY(0, 1, KEY_DELETE),          /* Delete    */
        KEY(2, 2, KEY_PLAY),            /* Play      */
        KEY(1, 0, KEY_PAGEUP),          /* Up        */
        KEY(1, 3, KEY_PAGEDOWN),        /* Down      */
        KEY(2, 0, KEY_EMAIL),           /* ReadEmail */
        KEY(2, 1, KEY_STOP),            /* Stop      */

        /* Numeric keypad portion */
        KEY(0, 7, KEY_KP1),
        KEY(0, 6, KEY_KP2),
        KEY(0, 5, KEY_KP3),
        KEY(1, 7, KEY_KP4),
        KEY(1, 6, KEY_KP5),
        KEY(1, 5, KEY_KP6),
        KEY(2, 7, KEY_KP7),
        KEY(2, 6, KEY_KP8),
        KEY(2, 5, KEY_KP9),
        KEY(3, 6, KEY_KP0),
        KEY(3, 7, KEY_KPASTERISK),
        KEY(3, 5, KEY_KPDOT),           /* # key     */
        KEY(7, 2, KEY_NUMLOCK),         /* Mute      */
        KEY(7, 1, KEY_KPMINUS),         /* Recall    */
        KEY(6, 1, KEY_KPPLUS),          /* Redial    */
        KEY(7, 6, KEY_KPSLASH),         /* Handsfree */
        KEY(6, 0, KEY_ENTER),           /* Video     */

        KEY(7, 4, KEY_CAMERA),          /* Photo     */

        KEY(0, 4, KEY_F2),              /* Home      */
        KEY(1, 4, KEY_F3),              /* Office    */
        KEY(2, 4, KEY_F4),              /* Mobile    */
        KEY(7, 7, KEY_F5),              /* SMS       */
        KEY(7, 5, KEY_F6),              /* Email     */

        /* QWERTY portion of keypad */
        KEY(3, 4, KEY_Q),
        KEY(3, 3, KEY_W),
        KEY(3, 2, KEY_E),
        KEY(3, 1, KEY_R),
        KEY(3, 0, KEY_T),
        KEY(4, 7, KEY_Y),
        KEY(4, 6, KEY_U),
        KEY(4, 5, KEY_I),
        KEY(4, 4, KEY_O),
        KEY(4, 3, KEY_P),

        KEY(4, 2, KEY_A),
        KEY(4, 1, KEY_S),
        KEY(4, 0, KEY_D),
        KEY(5, 7, KEY_F),
        KEY(5, 6, KEY_G),
        KEY(5, 5, KEY_H),
        KEY(5, 4, KEY_J),
        KEY(5, 3, KEY_K),
        KEY(5, 2, KEY_L),

        KEY(5, 1, KEY_Z),
        KEY(5, 0, KEY_X),
        KEY(6, 7, KEY_C),
        KEY(6, 6, KEY_V),
        KEY(6, 5, KEY_B),
        KEY(6, 4, KEY_N),
        KEY(6, 3, KEY_M),
        KEY(6, 2, KEY_SPACE),

        KEY(7, 0, KEY_LEFTSHIFT),       /* Vol up    */
        KEY(7, 3, KEY_LEFTCTRL),        /* Vol down  */
};

#define LATCH1_PHYS     0x01000000
#define LATCH1_VIRT     0xEA000000
#define MODEM_PHYS      0x04000000
#define MODEM_VIRT      0xEB000000
#define LATCH2_PHYS     0x08000000
#define LATCH2_VIRT     0xEC000000

static struct map_desc ams_delta_io_desc[] __initdata = {
        /* AMS_DELTA_LATCH1 */
        {
                .virtual        = LATCH1_VIRT,
                .pfn            = __phys_to_pfn(LATCH1_PHYS),
                .length         = 0x01000000,
                .type           = MT_DEVICE
        },
        /* AMS_DELTA_LATCH2 */
        {
                .virtual        = LATCH2_VIRT,
                .pfn            = __phys_to_pfn(LATCH2_PHYS),
                .length         = 0x01000000,
                .type           = MT_DEVICE
        },
        /* AMS_DELTA_MODEM */
        {
                .virtual        = MODEM_VIRT,
                .pfn            = __phys_to_pfn(MODEM_PHYS),
                .length         = 0x01000000,
                .type           = MT_DEVICE
        }
};

static const struct omap_lcd_config ams_delta_lcd_config __initconst = {
        .ctrl_name      = "internal",
};

static struct omap_usb_config ams_delta_usb_config __initdata = {
        .register_host  = 1,
        .hmc_mode       = 16,
        .pins[0]        = 2,
};

#define LATCH1_NGPIO            8

static struct resource latch1_resources[] = {
        [0] = {
                .name   = "dat",
                .start  = LATCH1_PHYS,
                .end    = LATCH1_PHYS + (LATCH1_NGPIO - 1) / 8,
                .flags  = IORESOURCE_MEM,
        },
};

#define LATCH1_LABEL    "latch1"

static struct bgpio_pdata latch1_pdata = {
        .label  = LATCH1_LABEL,
        .base   = -1,
        .ngpio  = LATCH1_NGPIO,
};

static struct platform_device latch1_gpio_device = {
        .name           = "basic-mmio-gpio",
        .id             = 0,
        .resource       = latch1_resources,
        .num_resources  = ARRAY_SIZE(latch1_resources),
        .dev            = {
                .platform_data  = &latch1_pdata,
        },
};

#define LATCH1_PIN_LED_CAMERA           0
#define LATCH1_PIN_LED_ADVERT           1
#define LATCH1_PIN_LED_MAIL             2
#define LATCH1_PIN_LED_HANDSFREE        3
#define LATCH1_PIN_LED_VOICEMAIL        4
#define LATCH1_PIN_LED_VOICE            5
#define LATCH1_PIN_DOCKIT1              6
#define LATCH1_PIN_DOCKIT2              7

#define LATCH2_NGPIO                    16

static struct resource latch2_resources[] = {
        [0] = {
                .name   = "dat",
                .start  = LATCH2_PHYS,
                .end    = LATCH2_PHYS + (LATCH2_NGPIO - 1) / 8,
                .flags  = IORESOURCE_MEM,
        },
};

#define LATCH2_LABEL    "latch2"

static struct bgpio_pdata latch2_pdata = {
        .label  = LATCH2_LABEL,
        .base   = -1,
        .ngpio  = LATCH2_NGPIO,
};

static struct platform_device latch2_gpio_device = {
        .name           = "basic-mmio-gpio",
        .id             = 1,
        .resource       = latch2_resources,
        .num_resources  = ARRAY_SIZE(latch2_resources),
        .dev            = {
                .platform_data  = &latch2_pdata,
        },
};

#define LATCH2_PIN_LCD_VBLEN            0
#define LATCH2_PIN_LCD_NDISP            1
#define LATCH2_PIN_NAND_NCE             2
#define LATCH2_PIN_NAND_NRE             3
#define LATCH2_PIN_NAND_NWP             4
#define LATCH2_PIN_NAND_NWE             5
#define LATCH2_PIN_NAND_ALE             6
#define LATCH2_PIN_NAND_CLE             7
#define LATCH2_PIN_KEYBRD_PWR           8
#define LATCH2_PIN_KEYBRD_DATAOUT       9
#define LATCH2_PIN_SCARD_RSTIN          10
#define LATCH2_PIN_SCARD_CMDVCC         11
#define LATCH2_PIN_MODEM_NRESET         12
#define LATCH2_PIN_MODEM_CODEC          13
#define LATCH2_PIN_HANDSFREE_MUTE       14
#define LATCH2_PIN_HANDSET_MUTE         15

static struct regulator_consumer_supply modem_nreset_consumers[] = {
        REGULATOR_SUPPLY("RESET#", "serial8250.1"),
        REGULATOR_SUPPLY("POR", "cx20442-codec"),
};

static struct regulator_init_data modem_nreset_data = {
        .constraints            = {
                .valid_ops_mask         = REGULATOR_CHANGE_STATUS,
                .boot_on                = 1,
        },
        .num_consumer_supplies  = ARRAY_SIZE(modem_nreset_consumers),
        .consumer_supplies      = modem_nreset_consumers,
};

static struct fixed_voltage_config modem_nreset_config = {
        .supply_name            = "modem_nreset",
        .microvolts             = 3300000,
        .startup_delay          = 25000,
        .enabled_at_boot        = 1,
        .init_data              = &modem_nreset_data,
};

static struct platform_device modem_nreset_device = {
        .name   = "reg-fixed-voltage",
        .id     = -1,
        .dev    = {
                .platform_data  = &modem_nreset_config,
        },
};

static struct gpiod_lookup_table ams_delta_nreset_gpiod_table = {
        .dev_id = "reg-fixed-voltage",
        .table = {
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_MODEM_NRESET,
                            NULL, GPIO_ACTIVE_HIGH),
                { },
        },
};

struct modem_private_data {
        struct regulator *regulator;
};

static struct modem_private_data modem_priv;

/*
 * Define partitions for flash device
 */

static struct mtd_partition partition_info[] = {
        { .name         = "Kernel",
          .offset       = 0,
          .size         = 3 * SZ_1M + SZ_512K },
        { .name         = "u-boot",
          .offset       = 3 * SZ_1M + SZ_512K,
          .size         = SZ_256K },
        { .name         = "u-boot params",
          .offset       = 3 * SZ_1M + SZ_512K + SZ_256K,
          .size         = SZ_256K },
        { .name         = "Amstrad LDR",
          .offset       = 4 * SZ_1M,
          .size         = SZ_256K },
        { .name         = "File system",
          .offset       = 4 * SZ_1M + 1 * SZ_256K,
          .size         = 27 * SZ_1M },
        { .name         = "PBL reserved",
          .offset       = 32 * SZ_1M - 3 * SZ_256K,
          .size         =  3 * SZ_256K },
};

static struct gpio_nand_platdata nand_platdata = {
        .parts          = partition_info,
        .num_parts      = ARRAY_SIZE(partition_info),
};

static struct platform_device ams_delta_nand_device = {
        .name   = "ams-delta-nand",
        .id     = -1,
        .dev    = {
                .platform_data = &nand_platdata,
        },
};

#define OMAP_GPIO_LABEL         "gpio-0-15"
#define OMAP_MPUIO_LABEL        "mpuio"

static struct gpiod_lookup_table ams_delta_nand_gpio_table = {
        .table = {
                GPIO_LOOKUP(OMAP_GPIO_LABEL, AMS_DELTA_GPIO_PIN_NAND_RB, "rdy",
                            0),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_NCE, "nce",
                            GPIO_ACTIVE_LOW),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_NRE, "nre",
                            GPIO_ACTIVE_LOW),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_NWP, "nwp",
                            GPIO_ACTIVE_LOW),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_NWE, "nwe",
                            GPIO_ACTIVE_LOW),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_ALE, "ale", 0),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_CLE, "cle", 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 0, "data", 0, 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 1, "data", 1, 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 2, "data", 2, 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 3, "data", 3, 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 4, "data", 4, 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 5, "data", 5, 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 6, "data", 6, 0),
                GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 7, "data", 7, 0),
                { },
        },
};

static struct resource ams_delta_kp_resources[] = {
        [0] = {
                .start  = INT_KEYBOARD,
                .end    = INT_KEYBOARD,
                .flags  = IORESOURCE_IRQ,
        },
};

static const struct matrix_keymap_data ams_delta_keymap_data = {
        .keymap         = ams_delta_keymap,
        .keymap_size    = ARRAY_SIZE(ams_delta_keymap),
};

static struct omap_kp_platform_data ams_delta_kp_data = {
        .rows           = 8,
        .cols           = 8,
        .keymap_data    = &ams_delta_keymap_data,
        .delay          = 9,
};

static struct platform_device ams_delta_kp_device = {
        .name           = "omap-keypad",
        .id             = -1,
        .dev            = {
                .platform_data = &ams_delta_kp_data,
        },
        .num_resources  = ARRAY_SIZE(ams_delta_kp_resources),
        .resource       = ams_delta_kp_resources,
};

static struct platform_device ams_delta_lcd_device = {
        .name   = "lcd_ams_delta",
        .id     = -1,
};

static struct gpiod_lookup_table ams_delta_lcd_gpio_table = {
        .table = {
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_LCD_VBLEN, "vblen", 0),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_LCD_NDISP, "ndisp", 0),
                { },
        },
};

static struct gpio_led gpio_leds[] __initdata = {
        [LATCH1_PIN_LED_CAMERA] = {
                .name            = "camera",
                .default_state   = LEDS_GPIO_DEFSTATE_OFF,
#ifdef CONFIG_LEDS_TRIGGERS
                .default_trigger = "ams_delta_camera",
#endif
        },
        [LATCH1_PIN_LED_ADVERT] = {
                .name            = "advert",
                .default_state   = LEDS_GPIO_DEFSTATE_OFF,
        },
        [LATCH1_PIN_LED_MAIL] = {
                .name            = "email",
                .default_state   = LEDS_GPIO_DEFSTATE_OFF,
        },
        [LATCH1_PIN_LED_HANDSFREE] = {
                .name            = "handsfree",
                .default_state   = LEDS_GPIO_DEFSTATE_OFF,
        },
        [LATCH1_PIN_LED_VOICEMAIL] = {
                .name            = "voicemail",
                .default_state   = LEDS_GPIO_DEFSTATE_OFF,
        },
        [LATCH1_PIN_LED_VOICE] = {
                .name            = "voice",
                .default_state   = LEDS_GPIO_DEFSTATE_OFF,
        },
};

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

static struct gpiod_lookup_table leds_gpio_table = {
        .table = {
                GPIO_LOOKUP_IDX(LATCH1_LABEL, LATCH1_PIN_LED_CAMERA, NULL,
                                LATCH1_PIN_LED_CAMERA, 0),
                GPIO_LOOKUP_IDX(LATCH1_LABEL, LATCH1_PIN_LED_ADVERT, NULL,
                                LATCH1_PIN_LED_ADVERT, 0),
                GPIO_LOOKUP_IDX(LATCH1_LABEL, LATCH1_PIN_LED_MAIL, NULL,
                                LATCH1_PIN_LED_MAIL, 0),
                GPIO_LOOKUP_IDX(LATCH1_LABEL, LATCH1_PIN_LED_HANDSFREE, NULL,
                                LATCH1_PIN_LED_HANDSFREE, 0),
                GPIO_LOOKUP_IDX(LATCH1_LABEL, LATCH1_PIN_LED_VOICEMAIL, NULL,
                                LATCH1_PIN_LED_VOICEMAIL, 0),
                GPIO_LOOKUP_IDX(LATCH1_LABEL, LATCH1_PIN_LED_VOICE, NULL,
                                LATCH1_PIN_LED_VOICE, 0),
                { },
        },
};

#ifdef CONFIG_LEDS_TRIGGERS
DEFINE_LED_TRIGGER(ams_delta_camera_led_trigger);
#endif

static struct platform_device ams_delta_audio_device = {
        .name   = "ams-delta-audio",
        .id     = -1,
};

static struct gpiod_lookup_table ams_delta_audio_gpio_table = {
        .table = {
                GPIO_LOOKUP(OMAP_GPIO_LABEL, AMS_DELTA_GPIO_PIN_HOOK_SWITCH,
                            "hook_switch", 0),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_MODEM_CODEC,
                            "modem_codec", 0),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_HANDSFREE_MUTE,
                            "handsfree_mute", 0),
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_HANDSET_MUTE,
                            "handset_mute", 0),
                { },
        },
};

static struct platform_device cx20442_codec_device = {
        .name   = "cx20442-codec",
        .id     = -1,
};

static struct resource ams_delta_serio_resources[] = {
        {
                .flags  = IORESOURCE_IRQ,
                /*
                 * Initialize IRQ resource with invalid IRQ number.
                 * It will be replaced with dynamically allocated GPIO IRQ
                 * obtained from GPIO chip as soon as the chip is available.
                 */
                .start  = -EINVAL,
                .end    = -EINVAL,
        },
};

static struct platform_device ams_delta_serio_device = {
        .name           = "ams-delta-serio",
        .id             = PLATFORM_DEVID_NONE,
        .dev            = {
                /*
                 * Initialize .platform_data explicitly with NULL to
                 * indicate it is going to be used.  It will be replaced
                 * with FIQ buffer address as soon as FIQ is initialized.
                 */
                .platform_data = NULL,
        },
        .num_resources  = ARRAY_SIZE(ams_delta_serio_resources),
        .resource       = ams_delta_serio_resources,
};

static struct regulator_consumer_supply keybrd_pwr_consumers[] = {
        /*
         * Initialize supply .dev_name with NULL.  It will be replaced
         * with serio dev_name() as soon as the serio device is registered.
         */
        REGULATOR_SUPPLY("vcc", NULL),
};

static struct regulator_init_data keybrd_pwr_initdata = {
        .constraints            = {
                .valid_ops_mask         = REGULATOR_CHANGE_STATUS,
        },
        .num_consumer_supplies  = ARRAY_SIZE(keybrd_pwr_consumers),
        .consumer_supplies      = keybrd_pwr_consumers,
};

static struct fixed_voltage_config keybrd_pwr_config = {
        .supply_name            = "keybrd_pwr",
        .microvolts             = 5000000,
        .init_data              = &keybrd_pwr_initdata,
};

static struct platform_device keybrd_pwr_device = {
        .name   = "reg-fixed-voltage",
        .id     = PLATFORM_DEVID_AUTO,
        .dev    = {
                .platform_data  = &keybrd_pwr_config,
        },
};

static struct gpiod_lookup_table keybrd_pwr_gpio_table = {
        .table = {
                GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_KEYBRD_PWR, NULL,
                            GPIO_ACTIVE_HIGH),
                { },
        },
};

static struct platform_device *ams_delta_devices[] __initdata = {
        &latch1_gpio_device,
        &latch2_gpio_device,
        &ams_delta_kp_device,
        &ams_delta_audio_device,
        &ams_delta_serio_device,
        &ams_delta_nand_device,
        &ams_delta_lcd_device,
        &cx20442_codec_device,
};

static struct gpiod_lookup_table *ams_delta_gpio_tables[] __initdata = {
        &ams_delta_nreset_gpiod_table,
        &ams_delta_audio_gpio_table,
        &keybrd_pwr_gpio_table,
        &ams_delta_lcd_gpio_table,
        &ams_delta_nand_gpio_table,
};

/*
 * Some drivers may not use GPIO lookup tables but need to be provided
 * with GPIO numbers.  The same applies to GPIO based IRQ lines - some
 * drivers may even not use GPIO layer but expect just IRQ numbers.
 * We could either define GPIO lookup tables then use them on behalf
 * of those devices, or we can use GPIO driver level methods for
 * identification of GPIO and IRQ numbers. For the purpose of the latter,
 * defina a helper function which identifies GPIO chips by their labels.
 */
static int gpiochip_match_by_label(struct gpio_chip *chip, void *data)
{
        char *label = data;

        return !strcmp(label, chip->label);
}

static struct gpiod_hog ams_delta_gpio_hogs[] = {
        GPIO_HOG(LATCH2_LABEL, LATCH2_PIN_KEYBRD_DATAOUT, "keybrd_dataout",
                 GPIO_ACTIVE_HIGH, GPIOD_OUT_LOW),
        {},
};

static struct plat_serial8250_port ams_delta_modem_ports[];

/*
 * Obtain MODEM IRQ GPIO descriptor using its hardware pin
 * number and assign related IRQ number to the MODEM port.
 * Keep the GPIO descriptor open so nobody steps in.
 */
static void __init modem_assign_irq(struct gpio_chip *chip)
{
        struct gpio_desc *gpiod;

        gpiod = gpiochip_request_own_desc(chip, AMS_DELTA_GPIO_PIN_MODEM_IRQ,
                                          "modem_irq", GPIO_ACTIVE_HIGH,
                                          GPIOD_IN);
        if (IS_ERR(gpiod)) {
                pr_err("%s: modem IRQ GPIO request failed (%ld)\n", __func__,
                       PTR_ERR(gpiod));
        } else {
                ams_delta_modem_ports[0].irq = gpiod_to_irq(gpiod);
        }
}

/*
 * The purpose of this function is to take care of proper initialization of
 * devices and data structures which depend on GPIO lines provided by OMAP GPIO
 * banks but their drivers don't use GPIO lookup tables or GPIO layer at all.
 * The function may be called as soon as OMAP GPIO devices are probed.
 * Since that happens at postcore_initcall, it can be called successfully
 * from init_machine or later.
 * Dependent devices may be registered from within this function or later.
 */
static void __init omap_gpio_deps_init(void)
{
        struct gpio_chip *chip;

        chip = gpiochip_find(OMAP_GPIO_LABEL, gpiochip_match_by_label);
        if (!chip) {
                pr_err("%s: OMAP GPIO chip not found\n", __func__);
                return;
        }

        /*
         * Start with FIQ initialization as it may have to request
         * and release successfully each OMAP GPIO pin in turn.
         */
        ams_delta_init_fiq(chip, &ams_delta_serio_device);

        modem_assign_irq(chip);
}

/*
 * Initialize latch2 pins with values which are safe for dependent on-board
 * devices or useful for their successull initialization even before GPIO
 * driver takes control over the latch pins:
 * - LATCH2_PIN_LCD_VBLEN       = 0
 * - LATCH2_PIN_LCD_NDISP       = 0     Keep LCD device powered off before its
 *                                      driver takes control over it.
 * - LATCH2_PIN_NAND_NCE        = 0
 * - LATCH2_PIN_NAND_NWP        = 0     Keep NAND device down and write-
 *                                      protected before its driver takes
 *                                      control over it.
 * - LATCH2_PIN_KEYBRD_PWR      = 0     Keep keyboard powered off before serio
 *                                      driver takes control over it.
 * - LATCH2_PIN_KEYBRD_DATAOUT  = 0     Keep low to avoid corruption of first
 *                                      byte of data received from attached
 *                                      keyboard when serio device is probed;
 *                                      the pin is also hogged low by the latch2
 *                                      GPIO driver as soon as it is ready.
 * - LATCH2_PIN_MODEM_NRESET    = 1     Enable voice MODEM device, allowing for
 *                                      its successful probe even before a
 *                                      regulator it depends on, which in turn
 *                                      takes control over the pin, is set up.
 * - LATCH2_PIN_MODEM_CODEC     = 1     Attach voice MODEM CODEC data port
 *                                      to the MODEM so the CODEC is under
 *                                      control even if audio driver doesn't
 *                                      take it over.
 */
static void __init ams_delta_latch2_init(void)
{
        u16 latch2 = 1 << LATCH2_PIN_MODEM_NRESET | 1 << LATCH2_PIN_MODEM_CODEC;

        __raw_writew(latch2, LATCH2_VIRT);
}

static void __init ams_delta_init(void)
{
        struct platform_device *leds_pdev;

        /* mux pins for uarts */
        omap_cfg_reg(UART1_TX);
        omap_cfg_reg(UART1_RTS);

        /* parallel camera interface */
        omap_cfg_reg(H19_1610_CAM_EXCLK);
        omap_cfg_reg(J15_1610_CAM_LCLK);
        omap_cfg_reg(L18_1610_CAM_VS);
        omap_cfg_reg(L15_1610_CAM_HS);
        omap_cfg_reg(L19_1610_CAM_D0);
        omap_cfg_reg(K14_1610_CAM_D1);
        omap_cfg_reg(K15_1610_CAM_D2);
        omap_cfg_reg(K19_1610_CAM_D3);
        omap_cfg_reg(K18_1610_CAM_D4);
        omap_cfg_reg(J14_1610_CAM_D5);
        omap_cfg_reg(J19_1610_CAM_D6);
        omap_cfg_reg(J18_1610_CAM_D7);

        omap_gpio_deps_init();
        ams_delta_latch2_init();
        gpiod_add_hogs(ams_delta_gpio_hogs);

        omap_serial_init();
        omap_register_i2c_bus(1, 100, NULL, 0);

        omap1_usb_init(&ams_delta_usb_config);
#ifdef CONFIG_LEDS_TRIGGERS
        led_trigger_register_simple("ams_delta_camera",
                        &ams_delta_camera_led_trigger);
#endif
        platform_add_devices(ams_delta_devices, ARRAY_SIZE(ams_delta_devices));

        /*
         * As soon as regulator consumers have been registered, assign their
         * dev_names to consumer supply entries of respective regulators.
         */
        keybrd_pwr_consumers[0].dev_name =
                        dev_name(&ams_delta_serio_device.dev);

        /*
         * Once consumer supply entries are populated with dev_names,
         * register regulator devices.  At this stage only the keyboard
         * power regulator has its consumer supply table fully populated.
         */
        platform_device_register(&keybrd_pwr_device);

        /*
         * As soon as GPIO consumers have been registered, assign
         * their dev_names to respective GPIO lookup tables.
         */
        ams_delta_audio_gpio_table.dev_id =
                        dev_name(&ams_delta_audio_device.dev);
        keybrd_pwr_gpio_table.dev_id = dev_name(&keybrd_pwr_device.dev);
        ams_delta_nand_gpio_table.dev_id = dev_name(&ams_delta_nand_device.dev);
        ams_delta_lcd_gpio_table.dev_id = dev_name(&ams_delta_lcd_device.dev);

        /*
         * Once GPIO lookup tables are populated with dev_names, register them.
         */
        gpiod_add_lookup_tables(ams_delta_gpio_tables,
                                ARRAY_SIZE(ams_delta_gpio_tables));

        leds_pdev = gpio_led_register_device(PLATFORM_DEVID_NONE, &leds_pdata);
        if (!IS_ERR_OR_NULL(leds_pdev)) {
                leds_gpio_table.dev_id = dev_name(&leds_pdev->dev);
                gpiod_add_lookup_table(&leds_gpio_table);
        }

        omap_writew(omap_readw(ARM_RSTCT1) | 0x0004, ARM_RSTCT1);

        omapfb_set_lcd_config(&ams_delta_lcd_config);
}

static void modem_pm(struct uart_port *port, unsigned int state, unsigned old)
{
        struct modem_private_data *priv = port->private_data;
        int ret;

        if (!priv)
                return;

        if (IS_ERR(priv->regulator))
                return;

        if (state == old)
                return;

        if (state == 0)
                ret = regulator_enable(priv->regulator);
        else if (old == 0)
                ret = regulator_disable(priv->regulator);
        else
                ret = 0;

        if (ret)
                dev_warn(port->dev,
                         "ams_delta modem_pm: failed to %sable regulator: %d\n",
                         state ? "dis" : "en", ret);
}

static struct plat_serial8250_port ams_delta_modem_ports[] = {
        {
                .membase        = IOMEM(MODEM_VIRT),
                .mapbase        = MODEM_PHYS,
                .irq            = IRQ_NOTCONNECTED, /* changed later */
                .flags          = UPF_BOOT_AUTOCONF,
                .irqflags       = IRQF_TRIGGER_RISING,
                .iotype         = UPIO_MEM,
                .regshift       = 1,
                .uartclk        = BASE_BAUD * 16,
                .pm             = modem_pm,
                .private_data   = &modem_priv,
        },
        { },
};

static struct platform_device ams_delta_modem_device = {
        .name   = "serial8250",
        .id     = PLAT8250_DEV_PLATFORM1,
        .dev            = {
                .platform_data = ams_delta_modem_ports,
        },
};

static int __init modem_nreset_init(void)
{
        int err;

        err = platform_device_register(&modem_nreset_device);
        if (err)
                pr_err("Couldn't register the modem regulator device\n");

        return err;
}


/*
 * This function expects MODEM IRQ number already assigned to the port.
 * The MODEM device requires its RESET# pin kept high during probe.
 * That requirement can be fulfilled in several ways:
 * - with a descriptor of already functional modem_nreset regulator
 *   assigned to the MODEM private data,
 * - with the regulator not yet controlled by modem_pm function but
 *   already enabled by default on probe,
 * - before the modem_nreset regulator is probed, with the pin already
 *   set high explicitly.
 * The last one is already guaranteed by ams_delta_latch2_init() called
 * from machine_init.
 * In order to avoid taking over ttyS0 device slot, the MODEM device
 * should be registered after OMAP serial ports.  Since those ports
 * are registered at arch_initcall, this function can be called safely
 * at arch_initcall_sync earliest.
 */
static int __init ams_delta_modem_init(void)
{
        int err;

        if (!machine_is_ams_delta())
                return -ENODEV;

        omap_cfg_reg(M14_1510_GPIO2);

        /* Initialize the modem_nreset regulator consumer before use */
        modem_priv.regulator = ERR_PTR(-ENODEV);

        err = platform_device_register(&ams_delta_modem_device);

        return err;
}
arch_initcall_sync(ams_delta_modem_init);

static int __init late_init(void)
{
        int err;

        err = modem_nreset_init();
        if (err)
                return err;

        /*
         * Once the modem device is registered, the modem_nreset
         * regulator can be requested on behalf of that device.
         */
        modem_priv.regulator = regulator_get(&ams_delta_modem_device.dev,
                        "RESET#");
        if (IS_ERR(modem_priv.regulator)) {
                err = PTR_ERR(modem_priv.regulator);
                goto unregister;
        }
        return 0;

unregister:
        platform_device_unregister(&ams_delta_modem_device);
        return err;
}

static void __init ams_delta_init_late(void)
{
        omap1_init_late();
        late_init();
}

static void __init ams_delta_map_io(void)
{
        omap15xx_map_io();
        iotable_init(ams_delta_io_desc, ARRAY_SIZE(ams_delta_io_desc));
}

MACHINE_START(AMS_DELTA, "Amstrad E3 (Delta)")
        /* Maintainer: Jonathan McDowell <noodles@earth.li> */
        .atag_offset    = 0x100,
        .map_io         = ams_delta_map_io,
        .init_early     = omap1_init_early,
        .init_irq       = omap1_init_irq,
        .handle_irq     = omap1_handle_irq,
        .init_machine   = ams_delta_init,
        .init_late      = ams_delta_init_late,
        .init_time      = omap1_timer_init,
        .restart        = omap1_restart,
MACHINE_END