/*
 * Copyright (c) 2018 naehrwert
 *
 * Copyright (c) 2018 CTCaer
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>

#include "gfx/di.h"
#include "gfx/gfx.h"
#include "libs/fatfs/ff.h"
#include "mem/heap.h"
#include "power/max77620.h"
#include "rtc/max77620-rtc.h"
#include "soc/hw_init.h"
#include "soc/i2c.h"
#include "soc/pmc.h"
#include "soc/t210.h"
#include "storage/sdmmc.h"
#include "utils/btn.h"
#include "utils/util.h"

#include "keys/keys.h"

sdmmc_t sd_sdmmc;
sdmmc_storage_t sd_storage;
FATFS sd_fs;
static bool sd_mounted;

boot_cfg_t *b_cfg;

bool sd_mount()
{
    if (sd_mounted)
        return true;

    if (!sdmmc_storage_init_sd(&sd_storage, &sd_sdmmc, SDMMC_1, SDMMC_BUS_WIDTH_4, 11))
    {
        EPRINTF("Failed to init SD card.\nMake sure that it is inserted.\nOr that SD reader is properly seated!");
    }
    else
    {
        int res = 0;
        res = f_mount(&sd_fs, "", 1);
        if (res == FR_OK)
        {
            sd_mounted = 1;
            return true;
        }
        else
        {
            EPRINTFARGS("Failed to mount SD card (FatFS Error %d).\nMake sure that a FAT partition exists..", res);
        }
    }

    return false;
}

void sd_unmount()
{
    if (sd_mounted)
    {
        f_mount(NULL, "", 1);
        sdmmc_storage_end(&sd_storage);
        sd_mounted = false;
    }
}

void *sd_file_read(char *path)
{
    FIL fp;
    if (f_open(&fp, path, FA_READ) != FR_OK)
        return NULL;

    u32 size = f_size(&fp);
    void *buf = malloc(size);

    u8 *ptr = buf;
    while (size > 0)
    {
        u32 rsize = MIN(size, 512 * 512);
        if (f_read(&fp, ptr, rsize, NULL) != FR_OK)
        {
            free(buf);
            return NULL;
        }

        ptr += rsize;
        size -= rsize;
    }

    f_close(&fp);

    return buf;
}

int sd_save_to_file(void *buf, u32 size, const char *filename)
{
    FIL fp;
    u32 res = 0;
    res = f_open(&fp, filename, FA_CREATE_ALWAYS | FA_WRITE);
    if (res)
    {
        EPRINTFARGS("Error (%d) creating file\n%s.\n", res, filename);
        return 1;
    }

    f_sync(&fp);
    f_write(&fp, buf, size, NULL);
    f_close(&fp);

    return 0;
}

void panic(u32 val)
{
    // Set panic code.
    PMC(APBDEV_PMC_SCRATCH200) = val;
    //PMC(APBDEV_PMC_CRYPTO_OP) = 1; // Disable SE.
    TMR(TIMER_WDT4_UNLOCK_PATTERN) = TIMER_MAGIC_PTRN;
    TMR(TIMER_TMR9_TMR_PTV) = TIMER_EN | TIMER_PER_EN;
    TMR(TIMER_WDT4_CONFIG)  = TIMER_SRC(9) | TIMER_PER(1) | TIMER_PMCRESET_EN;
    TMR(TIMER_WDT4_COMMAND) = TIMER_START_CNT;
    while (1)
        ;
}

void reboot_normal()
{
    sd_unmount();
    display_end();
    panic(0x21); // Bypass fuse programming in package1.
}

void reboot_rcm()
{
    sd_unmount();
    display_end();
    PMC(APBDEV_PMC_SCRATCH0) = 2; // Reboot into rcm.
    PMC(APBDEV_PMC_CNTRL) |= PMC_CNTRL_MAIN_RST;
    while (true)
        usleep(1);
}

void power_off()
{
    sd_unmount();
    max77620_rtc_stop_alarm();
    i2c_send_byte(I2C_5, MAX77620_I2C_ADDR, MAX77620_REG_ONOFFCNFG1, MAX77620_ONOFFCNFG1_PWR_OFF);
}

// This is a safe and unused DRAM region for our payloads.
// IPL_LOAD_ADDR is defined in makefile.
#define EXT_PAYLOAD_ADDR   0xC03C0000
#define PATCHED_RELOC_SZ   0x94
#define RCM_PAYLOAD_ADDR   (EXT_PAYLOAD_ADDR + ALIGN(PATCHED_RELOC_SZ, 0x10))
#define PAYLOAD_ENTRY      0x40010000
#define CBFS_SDRAM_EN_ADDR 0x4003e000
#define COREBOOT_ADDR      (0xD0000000 - 0x100000)

void (*ext_payload_ptr)() = (void *)EXT_PAYLOAD_ADDR;
void (*update_ptr)() = (void *)RCM_PAYLOAD_ADDR;

void reloc_patcher(u32 payload_dst, u32 payload_src, u32 payload_size)
{
	static const u32 START_OFF = 0x7C;
	static const u32 STACK_OFF = 0x80;
	static const u32 PAYLOAD_END_OFF = 0x84;
	static const u32 IPL_START_OFF = 0x88;

	memcpy((u8 *)payload_src, (u8 *)IPL_LOAD_ADDR, PATCHED_RELOC_SZ);

	*(vu32 *)(payload_src + START_OFF) = payload_dst - ALIGN(PATCHED_RELOC_SZ, 0x10);
	*(vu32 *)(payload_src + PAYLOAD_END_OFF) = payload_dst + payload_size;
	*(vu32 *)(payload_src + STACK_OFF) = 0x40008000;
	*(vu32 *)(payload_src + IPL_START_OFF) = payload_dst;

	if (payload_size == 0x7000)
	{
		memcpy((u8 *)(payload_src + ALIGN(PATCHED_RELOC_SZ, 0x10)), (u8 *)COREBOOT_ADDR, 0x7000); //Bootblock
		*(vu32 *)CBFS_SDRAM_EN_ADDR = 0x4452414D;
	}
}

extern void pivot_stack(u32 stack_top);

void ipl_main() {
    b_cfg = (boot_cfg_t *)(IPL_LOAD_ADDR + PATCHED_RELOC_SZ);

    config_hw();
    pivot_stack(0x4003F000);
    heap_init(0x90020000);

    display_init();
    u32 *fb = display_init_framebuffer();
    gfx_init_ctxt(&gfx_ctxt, fb, 720, 1280, 720);
    gfx_con_init(&gfx_con, &gfx_ctxt);
    display_backlight_pwm_init();

    sd_mount();
    dump_keys();
}