/*
 * Copyright (c) 2018 naehrwert
 *
 * Copyright (c) 2018-2020 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 <stdlib.h>

#include <memory_map.h>

#include "config.h"
#include <gfx/di.h>
#include <gfx_utils.h>
#include "gfx/logos.h"
#include <ianos/ianos.h>
#include <libs/compr/blz.h>
#include <libs/fatfs/ff.h>
#include <mem/heap.h>
#include <mem/minerva.h>
#include <mem/sdram.h>
#include <power/bq24193.h>
#include <power/max17050.h>
#include <power/max77620.h>
#include <power/max7762x.h>
#include <rtc/max77620-rtc.h>
#include <soc/bpmp.h>
#include <soc/fuse.h>
#include <soc/hw_init.h>
#include <soc/i2c.h>
#include <soc/pmc.h>
#include <soc/t210.h>
#include <soc/uart.h>
#include <storage/nx_sd.h>
#include <storage/sdmmc.h>
#include <utils/btn.h>
#include <utils/dirlist.h>
#include <utils/list.h>
#include <utils/util.h>

hekate_config h_cfg;
boot_cfg_t __attribute__((section ("._boot_cfg"))) b_cfg;

volatile nyx_storage_t *nyx_str = (nyx_storage_t *)NYX_STORAGE_ADDR;

// This is a safe and unused DRAM region for our payloads.
#define RELOC_META_OFF      0x7C
#define PATCHED_RELOC_SZ    0x94
#define PATCHED_RELOC_STACK 0x40007000
#define PATCHED_RELOC_ENTRY 0x40010000
#define EXT_PAYLOAD_ADDR    0xC0000000
#define RCM_PAYLOAD_ADDR    (EXT_PAYLOAD_ADDR + ALIGN(PATCHED_RELOC_SZ, 0x10))
#define COREBOOT_END_ADDR   0xD0000000
#define CBFS_DRAM_EN_ADDR   0x4003e000
#define  CBFS_DRAM_MAGIC    0x4452414D // "DRAM"

static void *coreboot_addr;

void reloc_patcher(u32 payload_dst, u32 payload_src, u32 payload_size)
{
	memcpy((u8 *)payload_src, (u8 *)IPL_LOAD_ADDR, PATCHED_RELOC_SZ);

	volatile reloc_meta_t *relocator = (reloc_meta_t *)(payload_src + RELOC_META_OFF);

	relocator->start = payload_dst - ALIGN(PATCHED_RELOC_SZ, 0x10);
	relocator->stack = PATCHED_RELOC_STACK;
	relocator->end   = payload_dst + payload_size;
	relocator->ep    = payload_dst;

	if (payload_size == 0x7000)
	{
		memcpy((u8 *)(payload_src + ALIGN(PATCHED_RELOC_SZ, 0x10)), coreboot_addr, 0x7000); //Bootblock
		*(vu32 *)CBFS_DRAM_EN_ADDR = CBFS_DRAM_MAGIC;
	}
}

int launch_payload(char *path, bool update)
{
	if (sd_mount())
	{
		FIL fp;
		if (f_open(&fp, path, FA_READ))
		{
			gfx_con.mute = 0;
			EPRINTFARGS("Payload file is missing!\n(%s)", path);

			goto out;
		}

		// Read and copy the payload to our chosen address
		void *buf;
		u32 size = f_size(&fp);

		if (size < 0x30000)
			buf = (void *)RCM_PAYLOAD_ADDR;
		else
		{
			coreboot_addr = (void *)(COREBOOT_END_ADDR - size);
			buf = coreboot_addr;
		}

		if (f_read(&fp, buf, size, NULL))
		{
			f_close(&fp);

			goto out;
		}

		f_close(&fp);

		sd_end();

		if (size < 0x30000)
		{
			if (update)
				memcpy((u8 *)(RCM_PAYLOAD_ADDR + PATCHED_RELOC_SZ), &b_cfg, sizeof(boot_cfg_t)); // Transfer boot cfg.
			else
				reloc_patcher(PATCHED_RELOC_ENTRY, EXT_PAYLOAD_ADDR, ALIGN(size, 0x10));

			hw_reinit_workaround(false, byte_swap_32(*(u32 *)(buf + size - sizeof(u32))));
		}
		else
		{
			reloc_patcher(PATCHED_RELOC_ENTRY, EXT_PAYLOAD_ADDR, 0x7000);
			hw_reinit_workaround(true, 0);
		}

		// Some cards (Sandisk U1), do not like a fast power cycle. Wait min 100ms.
		sdmmc_storage_init_wait_sd();

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

		// Launch our payload.
		if (!update)
			(*ext_payload_ptr)();
		else
		{
			EMC(EMC_SCRATCH0) |= EMC_HEKA_UPD;
			(*update_ptr)();
		}
	}

out:
	if (!update)
		sd_end();

	return 1;
}

#define EXCP_EN_ADDR   0x4003FFFC
#define  EXCP_MAGIC 0x30505645      // EVP0
#define EXCP_TYPE_ADDR 0x4003FFF8
#define  EXCP_TYPE_RESET 0x545352   // RST
#define  EXCP_TYPE_UNDEF 0x464455   // UDF
#define  EXCP_TYPE_PABRT 0x54424150 // PABT
#define  EXCP_TYPE_DABRT 0x54424144 // DABT
#define EXCP_LR_ADDR   0x4003FFF4

static void _show_errors()
{
	u32 *excp_enabled = (u32 *)EXCP_EN_ADDR;
	u32 *excp_type = (u32 *)EXCP_TYPE_ADDR;
	u32 *excp_lr = (u32 *)EXCP_LR_ADDR;

	if (*excp_enabled == EXCP_MAGIC)
		h_cfg.errors |= ERR_EXCEPT_ENB;

	//! FIXME: Find a better way to identify if that scratch has proper data.
	if (0 && PMC(APBDEV_PMC_SCRATCH37) & PMC_SCRATCH37_KERNEL_PANIC_FLAG)
	{
		// Set error and clear flag.
		h_cfg.errors |= ERR_L4T_KERNEL;
		PMC(APBDEV_PMC_SCRATCH37) &= ~PMC_SCRATCH37_KERNEL_PANIC_FLAG;
	}

	if (h_cfg.errors)
	{
		gfx_clear_grey(0x1B);
		gfx_con_setpos(0, 0);
		display_backlight_brightness(150, 1000);

		if (h_cfg.errors & ERR_SD_BOOT_EN)
			WPRINTF("Failed to init SD!\n");

		if (h_cfg.errors & ERR_LIBSYS_LP0)
			WPRINTF("Missing LP0 (sleep mode) lib!\n");
		if (h_cfg.errors & ERR_LIBSYS_MTC)
			WPRINTF("Missing or old Minerva lib!\n");

		if (h_cfg.errors & ~(ERR_EXCEPT_ENB | ERR_L4T_KERNEL))
			WPRINTF("\nUpdate bootloader folder!\n\n");

		if (h_cfg.errors & ERR_EXCEPT_ENB)
		{
			WPRINTFARGS("An exception occurred (LR %08X):\n", *excp_lr);
			switch (*excp_type)
			{
			case EXCP_TYPE_RESET:
				WPRINTF("RST");
				break;
			case EXCP_TYPE_UNDEF:
				WPRINTF("UNDEF");
				break;
			case EXCP_TYPE_PABRT:
				WPRINTF("PABRT");
				break;
			case EXCP_TYPE_DABRT:
				WPRINTF("DABRT");
				break;
			}
			WPRINTF("\n");

			// Clear the exception.
			*excp_enabled = 0;
		}

		if (h_cfg.errors & ERR_L4T_KERNEL)
		{
			WPRINTF("Panic occurred while running L4T.\n");
			if (!sd_save_to_file((void *)PSTORE_ADDR, PSTORE_SZ, "L4T_panic.bin"))
				WPRINTF("PSTORE saved to L4T_panic.bin\n");
		}

		WPRINTF("Press any key...");

		msleep(1000);
		btn_wait();
	}
}

static void _check_low_battery()
{
	int enough_battery;
	int batt_volt = 3500;
	int charge_status = 0;

	bq24193_get_property(BQ24193_ChargeStatus, &charge_status);
	max17050_get_property(MAX17050_AvgVCELL, &batt_volt);

	enough_battery = charge_status ? 3250 : 3000;

	if (batt_volt > enough_battery)
		goto out;

	// Prepare battery icon resources.
	u8 *battery_res = malloc(ALIGN(SZ_BATTERY_EMPTY, 0x1000));
	blz_uncompress_srcdest(BATTERY_EMPTY_BLZ, SZ_BATTERY_EMPTY_BLZ, battery_res, SZ_BATTERY_EMPTY);

	u8 *battery_icon = malloc(0x95A);  // 21x38x3
	u8 *charging_icon = malloc(0x2F4); // 21x12x3
	u8 *no_charging_icon = calloc(0x2F4, 1);

	memcpy(charging_icon, battery_res, 0x2F4);
	memcpy(battery_icon, battery_res + 0x2F4, 0x95A);

	u32 battery_icon_y_pos = 1280 - 16 - Y_BATTERY_EMPTY_BATT;
	u32 charging_icon_y_pos = 1280 - 16 - Y_BATTERY_EMPTY_BATT - 12 - Y_BATTERY_EMPTY_CHRG;
	free(battery_res);

	charge_status = !charge_status;

	u32 timer = 0;
	bool screen_on = false;
	while (true)
	{
		bpmp_msleep(250);

		// Refresh battery stats.
		int current_charge_status = 0;
		bq24193_get_property(BQ24193_ChargeStatus, &current_charge_status);
		max17050_get_property(MAX17050_AvgVCELL, &batt_volt);
		enough_battery = current_charge_status ? 3250 : 3000;

		if (batt_volt > enough_battery)
			break;

		// Refresh charging icon.
		if (screen_on && (charge_status != current_charge_status))
		{
			if (current_charge_status)
				gfx_set_rect_rgb(charging_icon, X_BATTERY_EMPTY, Y_BATTERY_EMPTY_CHRG, 16, charging_icon_y_pos);
			else
				gfx_set_rect_rgb(no_charging_icon, X_BATTERY_EMPTY, Y_BATTERY_EMPTY_CHRG, 16, charging_icon_y_pos);
		}

		// Check if it's time to turn off display.
		if (screen_on && timer < get_tmr_ms())
		{
			if (!current_charge_status)
			{
				max77620_low_battery_monitor_config(true);
				power_off();
			}

			display_end();
			screen_on = false;
		}

		// Check if charging status changed or Power button was pressed.
		if ((charge_status != current_charge_status) || (btn_wait_timeout_single(0, BTN_POWER) & BTN_POWER))
		{
			if (!screen_on)
			{
				display_init();
				u32 *fb = display_init_framebuffer_pitch();
				gfx_init_ctxt(fb, 720, 1280, 720);

				gfx_set_rect_rgb(battery_icon, X_BATTERY_EMPTY, Y_BATTERY_EMPTY_BATT, 16, battery_icon_y_pos);
				if (current_charge_status)
					gfx_set_rect_rgb(charging_icon, X_BATTERY_EMPTY, Y_BATTERY_EMPTY_CHRG, 16, charging_icon_y_pos);
				else
					gfx_set_rect_rgb(no_charging_icon, X_BATTERY_EMPTY, Y_BATTERY_EMPTY_CHRG, 16, charging_icon_y_pos);

				display_backlight_pwm_init();
				display_backlight_brightness(100, 1000);

				screen_on = true;
			}

			timer = get_tmr_ms() + 15000;
		}

		// Check if forcefully continuing.
		if (btn_read_vol() == (BTN_VOL_UP | BTN_VOL_DOWN))
			break;

		charge_status = current_charge_status;
	}

	display_end();

	free(battery_icon);
	free(charging_icon);
	free(no_charging_icon);

out:
	// Re enable Low Battery Monitor shutdown.
	max77620_low_battery_monitor_config(true);
}

extern void pivot_stack(u32 stack_top);

void ipl_main()
{
	// Do initial HW configuration. This is compatible with consecutive reruns without a reset.
	hw_init();

	// Pivot the stack so we have enough space.
	pivot_stack(IPL_STACK_TOP);

	// Tegra/Horizon configuration goes to 0x80000000+, package2 goes to 0xA9800000, we place our heap in between.
	heap_init(IPL_HEAP_START);

#ifdef DEBUG_UART_PORT
	uart_send(DEBUG_UART_PORT, (u8 *)"hekate: Hello!\r\n", 16);
	uart_wait_idle(DEBUG_UART_PORT, UART_TX_IDLE);
#endif

	// Check if battery is enough.
	_check_low_battery();

	set_default_configuration();

	// Mount SD Card.
	h_cfg.errors |= !sd_mount() ? ERR_SD_BOOT_EN : 0;

	// Save sdram lp0 config.
	if (!ianos_loader("bootloader/sys/libsys_lp0.bso", DRAM_LIB, (void *)sdram_get_params_patched()))
		h_cfg.errors |= ERR_LIBSYS_LP0;

	// Train DRAM and switch to max frequency.
	if (minerva_init())
		h_cfg.errors |= ERR_LIBSYS_MTC;

	display_init();

	u32 *fb = display_init_framebuffer_pitch();
	gfx_init_ctxt(fb, 720, 1280, 720);

	gfx_con_init();

	display_backlight_pwm_init();
	//display_backlight_brightness(h_cfg.backlight, 1000);

	// Overclock BPMP.
	bpmp_clk_rate_set(BPMP_CLK_DEFAULT_BOOST);

	// Show library errors.
	_show_errors();

	// Failed to launch Nyx, unmount SD Card.
	sd_end();

	minerva_change_freq(FREQ_800);

	if (sd_mount()) {
		if (f_stat("config/aio-switch-updater/atmosphere/fusee-secondary.bin", NULL) == FR_OK && f_unlink("atmosphere/fusee-secondary.bin") == FR_OK) {
			f_rename("config/aio-switch-updater/atmosphere/fusee-secondary.bin", "atmosphere/fusee-secondary.bin");
		}

		if (f_stat("config/aio-switch-updater/sept/payload.bin", NULL) == FR_OK && f_unlink("sept/payload.bin") == FR_OK) {
			f_rename("config/aio-switch-updater/sept/payload.bin", "sept/payload.bin");
		}
	}

	launch_payload("bootloader/update.bin", false);
	launch_payload("atmosphere/rebbot_payload.bin", false);
	EPRINTF("Failed to launch payload.");

	// Halt BPMP if we managed to get out of execution.
	while (true)
		bpmp_halt();
}