// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2012
 * Ивайло Димитров <freemangordon@abv.bg>
 *
 * (C) Copyright 2011-2012
 * Pali Rohár <pali@kernel.org>
 *
 * (C) Copyright 2010
 * Alistair Buxton <a.j.buxton@gmail.com>
 *
 * Derived from Beagle Board and 3430 SDP code:
 * (C) Copyright 2004-2008
 * Texas Instruments, <www.ti.com>
 *
 * Author :
 *      Sunil Kumar <sunilsaini05@gmail.com>
 *      Shashi Ranjan <shashiranjanmca05@gmail.com>
 *
 *      Richard Woodruff <r-woodruff2@ti.com>
 *      Syed Mohammed Khasim <khasim@ti.com>
 */

#include <common.h>
#include <dm.h>
#include <env.h>
#include <init.h>
#include <watchdog.h>
#include <wdt.h>
#include <malloc.h>
#include <twl4030.h>
#include <i2c.h>
#include <video_fb.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/bitops.h>
#include <asm/mach-types.h>
#include <asm/omap_i2c.h>
#include <asm/arch/mux.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/mmc_host_def.h>

#include "tag_omap.h"

/* Needed for ROM SMC call */
struct emu_hal_params_rx51 {
        u32 num_params;
        u32 param1;
        u32 param2;
        u32 param3;
        u32 param4;
};

#define ONENAND_GPMC_CONFIG1_RX51       0xfb001202
#define ONENAND_GPMC_CONFIG2_RX51       0x00111100
#define ONENAND_GPMC_CONFIG3_RX51       0x00020200
#define ONENAND_GPMC_CONFIG4_RX51       0x11001102
#define ONENAND_GPMC_CONFIG5_RX51       0x03101616
#define ONENAND_GPMC_CONFIG6_RX51       0x90060000

DECLARE_GLOBAL_DATA_PTR;

GraphicDevice gdev;

const omap3_sysinfo sysinfo = {
        DDR_STACKED,
        "Nokia RX-51",
        "OneNAND"
};

/* This structure contains default omap tags needed for booting Maemo 5 */
static struct tag_omap omap[] = {
        OMAP_TAG_UART_CONFIG(0x04),
        OMAP_TAG_SERIAL_CONSOLE_CONFIG(0x03, 0x01C200),
        OMAP_TAG_LCD_CONFIG("acx565akm", "internal", 90, 0x18),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cam_focus", 0x44, 0x1, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cam_launch", 0x45, 0x1, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cam_shutter", 0x6e, 0x1, 0x0, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cmt_apeslpx", 0x46, 0x2, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cmt_bsi", 0x9d, 0x2, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cmt_en", 0x4a, 0x2, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cmt_rst", 0x4b, 0x6, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cmt_rst_rq", 0x49, 0x6, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("cmt_wddis", 0x0d, 0x2, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("headphone", 0xb1, 0x1, 0x1, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("kb_lock", 0x71, 0x1, 0x0, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("proximity", 0x59, 0x0, 0x0, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("sleep_ind", 0xa2, 0x2, 0x2, 0x0),
        OMAP_TAG_GPIO_SWITCH_CONFIG("slide", GPIO_SLIDE, 0x0, 0x0, 0x0),
        OMAP_TAG_WLAN_CX3110X_CONFIG(0x25, 0xff, 87, 42, -1),
        OMAP_TAG_PARTITION_CONFIG("bootloader", 128 * 1024, 0x00000000, 0x00000003),
        OMAP_TAG_PARTITION_CONFIG("config", 384 * 1024, 0x00020000, 0x00000000),
        OMAP_TAG_PARTITION_CONFIG("log", 256 * 1024, 0x00080000, 0x00000000),
        OMAP_TAG_PARTITION_CONFIG("kernel", 2 * 1024*1024, 0x000c0000, 0x00000000),
        OMAP_TAG_PARTITION_CONFIG("initfs", 2 * 1024*1024, 0x002c0000, 0x00000000),
        OMAP_TAG_PARTITION_CONFIG("rootfs", 257280 * 1024, 0x004c0000, 0x00000000),
        OMAP_TAG_BOOT_REASON_CONFIG("pwr_key"),
        OMAP_TAG_VERSION_STR_CONFIG("product", "RX-51"),
        OMAP_TAG_VERSION_STR_CONFIG("hw-build", "2101"),
        OMAP_TAG_VERSION_STR_CONFIG("nolo", "1.4.14"),
        OMAP_TAG_VERSION_STR_CONFIG("boot-mode", "normal"),
        { }
};

static char *boot_reason_ptr;
static char *hw_build_ptr;
static char *nolo_version_ptr;
static char *boot_mode_ptr;
static int serial_was_console_enabled;

/*
 * Routine: init_omap_tags
 * Description: Initialize pointers to values in tag_omap
 */
static void init_omap_tags(void)
{
        char *component;
        char *version;
        int i = 0;
        while (omap[i].hdr.tag) {
                switch (omap[i].hdr.tag) {
                case OMAP_TAG_BOOT_REASON:
                        boot_reason_ptr = omap[i].u.boot_reason.reason_str;
                        break;
                case OMAP_TAG_VERSION_STR:
                        component = omap[i].u.version.component;
                        version = omap[i].u.version.version;
                        if (strcmp(component, "hw-build") == 0)
                                hw_build_ptr = version;
                        else if (strcmp(component, "nolo") == 0)
                                nolo_version_ptr = version;
                        else if (strcmp(component, "boot-mode") == 0)
                                boot_mode_ptr = version;
                        break;
                default:
                        break;
                }
                i++;
        }
}

static void reuse_omap_atags(struct tag_omap *t)
{
        char *component;
        char *version;
        while (t->hdr.tag) {
                switch (t->hdr.tag) {
                case OMAP_TAG_BOOT_REASON:
                        memset(boot_reason_ptr, 0, 12);
                        strcpy(boot_reason_ptr, t->u.boot_reason.reason_str);
                        break;
                case OMAP_TAG_VERSION_STR:
                        component = t->u.version.component;
                        version = t->u.version.version;
                        if (strcmp(component, "hw-build") == 0) {
                                memset(hw_build_ptr, 0, 12);
                                strcpy(hw_build_ptr, version);
                        } else if (strcmp(component, "nolo") == 0) {
                                memset(nolo_version_ptr, 0, 12);
                                strcpy(nolo_version_ptr, version);
                        } else if (strcmp(component, "boot-mode") == 0) {
                                memset(boot_mode_ptr, 0, 12);
                                strcpy(boot_mode_ptr, version);
                        }
                        break;
                case OMAP_TAG_UART:
                        if (t->u.uart.enabled_uarts)
                                serial_was_console_enabled = 1;
                        break;
                case OMAP_TAG_SERIAL_CONSOLE:
                        serial_was_console_enabled = 1;
                        break;
                default:
                        break;
                }
                t = tag_omap_next(t);
        }
}

/*
 * Routine: reuse_atags
 * Description: Reuse atags from previous bootloader.
 *              Reuse only only HW build, boot reason, boot mode and nolo
 */
static void reuse_atags(void)
{
        struct tag *t = (struct tag *)gd->bd->bi_boot_params;

        /* First tag must be ATAG_CORE */
        if (t->hdr.tag != ATAG_CORE)
                return;

        if (!boot_reason_ptr || !hw_build_ptr)
                return;

        /* Last tag must be ATAG_NONE */
        while (t->hdr.tag != ATAG_NONE) {
                switch (t->hdr.tag) {
                case ATAG_REVISION:
                        memset(hw_build_ptr, 0, 12);
                        sprintf(hw_build_ptr, "%x", t->u.revision.rev);
                        break;
                case ATAG_BOARD:
                        reuse_omap_atags((struct tag_omap *)&t->u);
                        break;
                default:
                        break;
                }
                t = tag_next(t);
        }
}

/*
 * Routine: board_init
 * Description: Early hardware init.
 */
int board_init(void)
{
#if defined(CONFIG_CMD_ONENAND)
        const u32 gpmc_regs_onenandrx51[GPMC_MAX_REG] = {
                ONENAND_GPMC_CONFIG1_RX51,
                ONENAND_GPMC_CONFIG2_RX51,
                ONENAND_GPMC_CONFIG3_RX51,
                ONENAND_GPMC_CONFIG4_RX51,
                ONENAND_GPMC_CONFIG5_RX51,
                ONENAND_GPMC_CONFIG6_RX51,
                0
        };
#endif
        /* in SRAM or SDRAM, finish GPMC */
        gpmc_init();
#if defined(CONFIG_CMD_ONENAND)
        enable_gpmc_cs_config(gpmc_regs_onenandrx51, &gpmc_cfg->cs[0],
                              CONFIG_SYS_ONENAND_BASE, GPMC_SIZE_256M);
#endif
        /* Enable the clks & power */
        per_clocks_enable();
        /* boot param addr */
        gd->bd->bi_boot_params = OMAP34XX_SDRC_CS0 + 0x100;
        return 0;
}

#ifdef CONFIG_REVISION_TAG
/*
 * Routine: get_board_revision
 * Description: Return board revision.
 */
u32 get_board_rev(void)
{
        return simple_strtol(hw_build_ptr, NULL, 16);
}
#endif

/*
 * Routine: setup_board_tags
 * Description: Append board specific boot tags.
 */
void setup_board_tags(struct tag **in_params)
{
        int setup_console_atag;
        char *setup_boot_reason_atag;
        char *setup_boot_mode_atag;
        char *str;
        int i;
        int size;
        int total_size;
        struct tag *params;
        struct tag_omap *t;

        params = (struct tag *)gd->bd->bi_boot_params;

        params->u.core.flags = 0x0;
        params->u.core.pagesize = 0x1000;
        params->u.core.rootdev = 0x0;

        /* append omap atag only if env setup_omap_atag is set to 1 */
        str = env_get("setup_omap_atag");
        if (!str || str[0] != '1')
                return;

        str = env_get("setup_console_atag");
        if (str && str[0]) {
                if (str[0] == '1')
                        setup_console_atag = 1;
                else
                        setup_console_atag = 0;
        } else {
                if (serial_was_console_enabled)
                        setup_console_atag = 1;
                else
                        setup_console_atag = 0;
        }

        setup_boot_reason_atag = env_get("setup_boot_reason_atag");
        setup_boot_mode_atag = env_get("setup_boot_mode_atag");

        params = *in_params;
        t = (struct tag_omap *)&params->u;
        total_size = sizeof(struct tag_header);

        for (i = 0; omap[i].hdr.tag; i++) {

                /* skip serial console tag */
                if (!setup_console_atag &&
                        omap[i].hdr.tag == OMAP_TAG_SERIAL_CONSOLE)
                        continue;

                size = omap[i].hdr.size + sizeof(struct tag_omap_header);
                memcpy(t, &omap[i], size);

                /* set uart tag to 0 - disable serial console */
                if (!setup_console_atag && omap[i].hdr.tag == OMAP_TAG_UART)
                        t->u.uart.enabled_uarts = 0;

                /* change boot reason */
                if (setup_boot_reason_atag &&
                        omap[i].hdr.tag == OMAP_TAG_BOOT_REASON) {
                        memset(t->u.boot_reason.reason_str, 0, 12);
                        strcpy(t->u.boot_reason.reason_str,
                                setup_boot_reason_atag);
                }

                /* change boot mode */
                if (setup_boot_mode_atag &&
                        omap[i].hdr.tag == OMAP_TAG_VERSION_STR &&
                        strcmp(omap[i].u.version.component, "boot-mode") == 0) {
                        memset(t->u.version.version, 0, 12);
                        strcpy(t->u.version.version, setup_boot_mode_atag);
                }

                total_size += size;
                t = tag_omap_next(t);

        }

        params->hdr.tag = ATAG_BOARD;
        params->hdr.size = total_size >> 2;
        params = tag_next(params);

        *in_params = params;
}

/*
 * Routine: video_hw_init
 * Description: Set up the GraphicDevice depending on sys_boot.
 */
void *video_hw_init(void)
{
        /* fill in Graphic Device */
        gdev.frameAdrs = 0x8f9c0000;
        gdev.winSizeX = 800;
        gdev.winSizeY = 480;
        gdev.gdfBytesPP = 2;
        gdev.gdfIndex = GDF_16BIT_565RGB;
        memset((void *)gdev.frameAdrs, 0, 0xbb800);
        return (void *) &gdev;
}

/*
 * Routine: twl4030_regulator_set_mode
 * Description: Set twl4030 regulator mode over i2c powerbus.
 */
static void twl4030_regulator_set_mode(u8 id, u8 mode)
{
        u16 msg = MSG_SINGULAR(DEV_GRP_P1, id, mode);
        twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
                             TWL4030_PM_MASTER_PB_WORD_MSB, msg >> 8);
        twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
                             TWL4030_PM_MASTER_PB_WORD_LSB, msg & 0xff);
}

static void omap3_emu_romcode_call(u32 service_id, u32 *parameters)
{
        u32 i, num_params = *parameters;
        u32 *sram_scratch_space = (u32 *)OMAP3_PUBLIC_SRAM_SCRATCH_AREA;

        /*
         * copy the parameters to an un-cached area to avoid coherency
         * issues
         */
        for (i = 0; i < num_params; i++) {
                __raw_writel(*parameters, sram_scratch_space);
                parameters++;
                sram_scratch_space++;
        }

        /* Now make the PPA call */
        do_omap3_emu_romcode_call(service_id, OMAP3_PUBLIC_SRAM_SCRATCH_AREA);
}

void omap3_set_aux_cr_secure(u32 acr)
{
        struct emu_hal_params_rx51 emu_romcode_params = { 0, };

        emu_romcode_params.num_params = 2;
        emu_romcode_params.param1 = acr;

        omap3_emu_romcode_call(OMAP3_EMU_HAL_API_WRITE_ACR,
                               (u32 *)&emu_romcode_params);
}

/*
 * Routine: omap3_update_aux_cr_secure_rx51
 * Description: Modify the contents Auxiliary Control Register.
 * Parameters:
 *   set_bits - bits to set in ACR
 *   clr_bits - bits to clear in ACR
 */
static void omap3_update_aux_cr_secure_rx51(u32 set_bits, u32 clear_bits)
{
        u32 acr;

        /* Read ACR */
        asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
        acr &= ~clear_bits;
        acr |= set_bits;
        omap3_set_aux_cr_secure(acr);
}

/*
 * Routine: misc_init_r
 * Description: Configure board specific parts.
 */
int misc_init_r(void)
{
        struct udevice *dev;
        char buf[12];
        u8 state;

        /* disable lp5523 led */
        if (i2c_get_chip_for_busnum(1, 0x32, 1, &dev) == 0)
                dm_i2c_reg_write(dev, 0x00, 0x00);

        /* initialize twl4030 power managment */
        twl4030_power_init();
        twl4030_power_mmc_init(0);
        twl4030_power_mmc_init(1);

        /* set VSIM to 1.8V */
        twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VSIM_DEDICATED,
                                TWL4030_PM_RECEIVER_VSIM_VSEL_18,
                                TWL4030_PM_RECEIVER_VSIM_DEV_GRP,
                                TWL4030_PM_RECEIVER_DEV_GRP_P1);

        /* store I2C access state */
        twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER, TWL4030_PM_MASTER_PB_CFG,
                            &state);

        /* enable I2C access to powerbus (needed for twl4030 regulator) */
        twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER, TWL4030_PM_MASTER_PB_CFG,
                             0x02);

        /* set VAUX3, VSIM and VMMC1 state to active - enable eMMC memory */
        twl4030_regulator_set_mode(RES_VAUX3, RES_STATE_ACTIVE);
        twl4030_regulator_set_mode(RES_VSIM, RES_STATE_ACTIVE);
        twl4030_regulator_set_mode(RES_VMMC1, RES_STATE_ACTIVE);

        /* restore I2C access state */
        twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER, TWL4030_PM_MASTER_PB_CFG,
                             state);

        /* set env variable attkernaddr for relocated kernel */
        sprintf(buf, "%#x", KERNEL_ADDRESS);
        env_set("attkernaddr", buf);

        /* initialize omap tags */
        init_omap_tags();

        /* reuse atags from previous bootloader */
        reuse_atags();

        omap_die_id_display();
        print_cpuinfo();

        /*
         * Cortex-A8(r1p0..r1p2) errata 430973 workaround
         * Set IBE bit in Auxiliary Control Register
         *
         * Call this routine only on real secure device
         * Qemu does not implement secure PPA and crash
         */
        if (get_device_type() == HS_DEVICE)
                omap3_update_aux_cr_secure_rx51(1 << 6, 0);

        return 0;
}

static unsigned long int twl_wd_time; /* last time of watchdog reset */
static unsigned long int twl_i2c_lock;

/*
 * Routine: rx51_watchdog_reset
 * Description: Reset timeout of twl4030 watchdog.
 */
static int rx51_watchdog_reset(struct udevice *dev)
{
        u8 timeout = 0;

        /* do not reset watchdog too often - max every 4s */
        if (get_timer(twl_wd_time) < 4 * CONFIG_SYS_HZ)
                return 0;

        /* localy lock twl4030 i2c bus */
        if (test_and_set_bit(0, &twl_i2c_lock))
                return 0;

        /* read actual watchdog timeout */
        twl4030_i2c_read_u8(TWL4030_CHIP_PM_RECEIVER,
                            TWL4030_PM_RECEIVER_WATCHDOG_CFG, &timeout);

        /* timeout 0 means watchdog is disabled */
        /* reset watchdog timeout to 31s (maximum) */
        if (timeout != 0)
                twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
                                     TWL4030_PM_RECEIVER_WATCHDOG_CFG, 31);

        /* store last watchdog reset time */
        twl_wd_time = get_timer(0);

        /* localy unlock twl4030 i2c bus */
        test_and_clear_bit(0, &twl_i2c_lock);

        return 0;
}

static int rx51_watchdog_start(struct udevice *dev, u64 timeout_ms, ulong flags)
{
        return 0;
}

static int rx51_watchdog_probe(struct udevice *dev)
{
        return 0;
}

static const struct wdt_ops rx51_watchdog_ops = {
        .start = rx51_watchdog_start,
        .reset = rx51_watchdog_reset,
};

U_BOOT_DRIVER(rx51_watchdog) = {
        .name = "rx51_watchdog",
        .id = UCLASS_WDT,
        .ops = &rx51_watchdog_ops,
        .probe = rx51_watchdog_probe,
};

/*
 * TWL4030 keypad handler for cfb_console
 */

static const char keymap[] = {
        /* normal */
        'q',  'o',  'p',  ',', '\b',    0,  'a',  's',
        'w',  'd',  'f',  'g',  'h',  'j',  'k',  'l',
        'e',  '.',    0,  '\r',   0,  'z',  'x',  'c',
        'r',  'v',  'b',  'n',  'm',  ' ',  ' ',    0,
        't',    0,    0,    0,    0,    0,    0,    0,
        'y',    0,    0,    0,    0,    0,    0,    0,
        'u',    0,    0,    0,    0,    0,    0,    0,
        'i',    5,    6,    0,    0,    0,    0,    0,
        /* fn */
        '1',  '9',  '0',  '=', '\b',    0,  '*',  '+',
        '2',  '#',  '-',  '_',  '(',  ')',  '&',  '!',
        '3',  '?',  '^', '\r',    0,  156,  '$',  238,
        '4',  '/', '\\',  '"', '\'',  '@',    0,  '<',
        '5',  '|',  '>',    0,    0,    0,    0,    0,
        '6',    0,    0,    0,    0,    0,    0,    0,
        '7',    0,    0,    0,    0,    0,    0,    0,
        '8',   16,   17,    0,    0,    0,    0,    0,
};

static u8 keys[8];
static u8 old_keys[8] = {0, 0, 0, 0, 0, 0, 0, 0};
#define KEYBUF_SIZE 32
static u8 keybuf[KEYBUF_SIZE];
static u8 keybuf_head;
static u8 keybuf_tail;

/*
 * Routine: rx51_kp_init
 * Description: Initialize HW keyboard.
 */
int rx51_kp_init(void)
{
        int ret = 0;
        u8 ctrl;
        ret = twl4030_i2c_read_u8(TWL4030_CHIP_KEYPAD,
                                  TWL4030_KEYPAD_KEYP_CTRL_REG, &ctrl);

        if (ret)
                return ret;

        /* turn on keyboard and use hardware scanning */
        ctrl |= TWL4030_KEYPAD_CTRL_KBD_ON;
        ctrl |= TWL4030_KEYPAD_CTRL_SOFT_NRST;
        ctrl |= TWL4030_KEYPAD_CTRL_SOFTMODEN;
        ret |= twl4030_i2c_write_u8(TWL4030_CHIP_KEYPAD,
                                    TWL4030_KEYPAD_KEYP_CTRL_REG, ctrl);
        /* enable key event status */
        ret |= twl4030_i2c_write_u8(TWL4030_CHIP_KEYPAD,
                                    TWL4030_KEYPAD_KEYP_IMR1, 0xfe);
        /* enable interrupt generation on rising and falling */
        /* this is a workaround for qemu twl4030 emulation */
        ret |= twl4030_i2c_write_u8(TWL4030_CHIP_KEYPAD,
                                    TWL4030_KEYPAD_KEYP_EDR, 0x57);
        /* enable ISR clear on read */
        ret |= twl4030_i2c_write_u8(TWL4030_CHIP_KEYPAD,
                                    TWL4030_KEYPAD_KEYP_SIH_CTRL, 0x05);
        return 0;
}

static void rx51_kp_fill(u8 k, u8 mods)
{
        /* check if some cursor key without meta fn key was pressed */
        if (!(mods & 2) && (k == 18 || k == 31 || k == 33 || k == 34)) {
                keybuf[keybuf_tail++] = '\e';
                keybuf_tail %= KEYBUF_SIZE;
                keybuf[keybuf_tail++] = '[';
                keybuf_tail %= KEYBUF_SIZE;
                if (k == 18) /* up */
                        keybuf[keybuf_tail++] = 'A';
                else if (k == 31) /* left */
                        keybuf[keybuf_tail++] = 'D';
                else if (k == 33) /* down */
                        keybuf[keybuf_tail++] = 'B';
                else if (k == 34) /* right */
                        keybuf[keybuf_tail++] = 'C';
                keybuf_tail %= KEYBUF_SIZE;
                return;
        }

        if (mods & 2) { /* fn meta key was pressed */
                k = keymap[k+64];
        } else {
                k = keymap[k];
                if (mods & 1) { /* ctrl key was pressed */
                        if (k >= 'a' && k <= 'z')
                                k -= 'a' - 1;
                }
                if (mods & 4) { /* shift key was pressed */
                        if (k >= 'a' && k <= 'z')
                                k += 'A' - 'a';
                        else if (k == '.')
                                k = ':';
                        else if (k == ',')
                                k = ';';
                }
        }
        keybuf[keybuf_tail++] = k;
        keybuf_tail %= KEYBUF_SIZE;
}

/*
 * Routine: rx51_kp_tstc
 * Description: Test if key was pressed (from buffer).
 */
int rx51_kp_tstc(struct stdio_dev *sdev)
{
        u8 c, r, dk, i;
        u8 intr;
        u8 mods;

        /* localy lock twl4030 i2c bus */
        if (test_and_set_bit(0, &twl_i2c_lock))
                return 0;

        /* twl4030 remembers up to 2 events */
        for (i = 0; i < 2; i++) {

                /* check interrupt register for events */
                twl4030_i2c_read_u8(TWL4030_CHIP_KEYPAD,
                                    TWL4030_KEYPAD_KEYP_ISR1 + (2 * i), &intr);

                /* no event */
                if (!(intr&1))
                        continue;

                /* read the key state */
                twl4030_i2c_read(TWL4030_CHIP_KEYPAD,
                                 TWL4030_KEYPAD_FULL_CODE_7_0, keys, 8);

                /* cut out modifier keys from the keystate */
                mods = keys[4] >> 4;
                keys[4] &= 0x0f;

                for (c = 0; c < 8; c++) {

                        /* get newly pressed keys only */
                        dk = ((keys[c] ^ old_keys[c])&keys[c]);
                        old_keys[c] = keys[c];

                        /* fill the keybuf */
                        for (r = 0; r < 8; r++) {
                                if (dk&1)
                                        rx51_kp_fill((c*8)+r, mods);
                                dk = dk >> 1;
                        }

                }

        }

        /* localy unlock twl4030 i2c bus */
        test_and_clear_bit(0, &twl_i2c_lock);

        return (KEYBUF_SIZE + keybuf_tail - keybuf_head)%KEYBUF_SIZE;
}

/*
 * Routine: rx51_kp_getc
 * Description: Get last pressed key (from buffer).
 */
int rx51_kp_getc(struct stdio_dev *sdev)
{
        keybuf_head %= KEYBUF_SIZE;
        while (!rx51_kp_tstc(sdev))
                WATCHDOG_RESET();
        return keybuf[keybuf_head++];
}

static const struct mmc_config rx51_mmc_cfg = {
        .host_caps = MMC_MODE_4BIT | MMC_MODE_HS_52MHz | MMC_MODE_HS,
        .f_min = 400000,
        .f_max = 52000000,
        .b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT,
        .voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195,
};

static const struct omap_hsmmc_plat rx51_mmc[] = {
        { rx51_mmc_cfg, (struct hsmmc *)OMAP_HSMMC1_BASE },
        { rx51_mmc_cfg, (struct hsmmc *)OMAP_HSMMC2_BASE },
};

U_BOOT_DRVINFOS(rx51_mmc) = {
        { "omap_hsmmc", &rx51_mmc[0] },
        { "omap_hsmmc", &rx51_mmc[1] },
};

static const struct omap_i2c_plat rx51_i2c[] = {
        { I2C_BASE1, 100000, OMAP_I2C_REV_V1 },
        { I2C_BASE2, 100000, OMAP_I2C_REV_V1 },
        { I2C_BASE3, 100000, OMAP_I2C_REV_V1 },
};

U_BOOT_DRVINFOS(rx51_i2c) = {
        { "i2c_omap", &rx51_i2c[0] },
        { "i2c_omap", &rx51_i2c[1] },
        { "i2c_omap", &rx51_i2c[2] },
};

U_BOOT_DRVINFOS(rx51_watchdog) = {
        { "rx51_watchdog" },
};