/* Copyright 2019 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "adc.h"
#include "adc_chip.h"
#include "gpio.h"
#include "timer.h"

#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ## args)

void board_reset_pd_mcu(void)
{
}

void board_config_pre_init(void)
{
	STM32_RCC_AHBENR |= STM32_RCC_HB_DMA1;
	/*
	 * Remap USART1 and SPI2 DMA:
	 *
	 * Ch4: USART1_TX / Ch5: USART1_RX (1000)
	 * Ch6: SPI2_RX / Ch7: SPI2_TX (0011)
	 */
	STM32_DMA_CSELR(STM32_DMAC_CH4) = (8 << 12) | (8 << 16) |
					  (3 << 20) | (3 << 24);
}

enum kukui_board_version {
	BOARD_VERSION_UNKNOWN = -1,
	BOARD_VERSION_REV0 = 0,
	BOARD_VERSION_REV1 = 1,
	BOARD_VERSION_REV2 = 2,
	BOARD_VERSION_REV3 = 3,
	BOARD_VERSION_REV4 = 4,
	BOARD_VERSION_REV5 = 5,
	BOARD_VERSION_REV6 = 6,
	BOARD_VERSION_REV7 = 7,
	BOARD_VERSION_REV8 = 8,
	BOARD_VERSION_REV9 = 9,
	BOARD_VERSION_REV10 = 10,
	BOARD_VERSION_REV11 = 11,
	BOARD_VERSION_REV12 = 12,
	BOARD_VERSION_REV13 = 13,
	BOARD_VERSION_REV14 = 14,
	BOARD_VERSION_REV15 = 15,
	BOARD_VERSION_COUNT,
};

struct {
	enum kukui_board_version version;
	int expect_mv;
} const kukui_boards[] = {
	{ BOARD_VERSION_REV0, 109 },   /* 51.1K , 2.2K(gru 3.3K) ohm */
	{ BOARD_VERSION_REV1, 211 },   /* 51.1k , 6.8K ohm */
	{ BOARD_VERSION_REV2, 319 },   /* 51.1K , 11K ohm */
	{ BOARD_VERSION_REV3, 427 },   /* 56K   , 17.4K ohm */
	{ BOARD_VERSION_REV4, 542 },   /* 51.1K , 22K ohm */
	{ BOARD_VERSION_REV5, 666 },   /* 51.1K , 30K ohm */
	{ BOARD_VERSION_REV6, 781 },   /* 51.1K , 39.2K ohm */
	{ BOARD_VERSION_REV7, 900 },   /* 56K   , 56K ohm */
	{ BOARD_VERSION_REV8, 1023 },  /* 47K   , 61.9K ohm */
	{ BOARD_VERSION_REV9, 1137 },  /* 47K   , 80.6K ohm */
	{ BOARD_VERSION_REV10, 1240 }, /* 56K   , 124K ohm */
	{ BOARD_VERSION_REV11, 1343 }, /* 51.1K , 150K ohm */
	{ BOARD_VERSION_REV12, 1457 }, /* 47K   , 200K ohm */
	{ BOARD_VERSION_REV13, 1576 }, /* 47K   , 330K ohm */
	{ BOARD_VERSION_REV14, 1684 }, /* 47K   , 680K ohm */
	{ BOARD_VERSION_REV15, 1800 }, /* 56K   , NC */
};
BUILD_ASSERT(ARRAY_SIZE(kukui_boards) == BOARD_VERSION_COUNT);

#define THRESHOLD_MV 56 /* Simply assume 1800/16/2 */

int board_get_version(void)
{
	static int version = BOARD_VERSION_UNKNOWN;
	int mv;
	int i;

	if (version != BOARD_VERSION_UNKNOWN)
		return version;

	gpio_set_level(GPIO_EC_BOARD_ID_EN_L, 0);
	/* Wait to allow cap charge */
	msleep(10);
	mv = adc_read_channel(ADC_BOARD_ID);

	if (mv == ADC_READ_ERROR)
		mv = adc_read_channel(ADC_BOARD_ID);

	gpio_set_level(GPIO_EC_BOARD_ID_EN_L, 1);

	for (i = 0; i < BOARD_VERSION_COUNT; ++i) {
		if (mv < kukui_boards[i].expect_mv + THRESHOLD_MV) {
			version = kukui_boards[i].version;
			break;
		}
	}

	/*
	 * For devices without pogo, Disable ADC module after we detect the
	 * board version, since this is the only thing ADC module needs to do
	 * for this board.
	 */
	if (CONFIG_DEDICATED_CHARGE_PORT_COUNT == 0 &&
			version != BOARD_VERSION_UNKNOWN)
		adc_disable();

	return version;
}

#ifndef VARIANT_KUKUI_BATTERY_SMART
int board_allow_i2c_passthru(int port)
{
	return (port == I2C_PORT_VIRTUAL_BATTERY);
}
#endif