/*
 * Copyright (c) 2022 Linaro Limited
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <ztest.h>
#include <soc.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/clock_control/stm32_clock_control.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(test);

#define DT_DRV_COMPAT st_stm32_spi

#if STM32_DT_INST_DEV_OPT_CLOCK_SUPPORT
#define STM32_SPI_OPT_CLOCK_SUPPORT 1
#else
#define STM32_SPI_OPT_CLOCK_SUPPORT 0
#endif

#define DT_NO_CLOCK 0xFFFFU

/* Not device related, but keep it to ensure core clock config is correct */
static void test_sysclk_freq(void)
{
	uint32_t soc_sys_clk_freq;

	soc_sys_clk_freq = HAL_RCC_GetSysClockFreq();

	zassert_equal(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC, soc_sys_clk_freq,
			"Expected sysclockfreq: %d. Actual sysclockfreq: %d",
			CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC, soc_sys_clk_freq);
}

static void test_spi_clk_config(void)
{
	static const struct stm32_pclken pclken[] = STM32_DT_CLOCKS(DT_NODELABEL(spi1));
	struct stm32_pclken spi1_reg_clk_cfg = pclken[0];

	uint32_t spi1_actual_clk_src, spi1_dt_ker_clk_src;
	uint32_t spi1_dt_clk_freq, spi1_actual_clk_freq;
	int r;

	/* Test clock_on(reg_clk) */
	r = clock_control_on(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
				(clock_control_subsys_t) &spi1_reg_clk_cfg);
	zassert_true((r == 0), "Could not enable SPI reg_clk");

	zassert_true(__HAL_RCC_SPI1_IS_CLK_ENABLED(), "SPI1 reg_clk should be on");
	TC_PRINT("SPI1 reg_clk on\n");

	if (IS_ENABLED(STM32_SPI_OPT_CLOCK_SUPPORT) && DT_NUM_CLOCKS(DT_NODELABEL(spi1)) > 1) {
		struct stm32_pclken spi1_ker_clk_cfg = pclken[1];

		/* Select ker_clk as device source clock */
		r = clock_control_configure(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
					    (clock_control_subsys_t) &spi1_ker_clk_cfg,
					    NULL);
		zassert_true((r == 0), "Could not enable SPI ker_clk");
		TC_PRINT("SPI1 ker_clk on\n");

		/* Test ker_clk is configured as device's source clock */
		spi1_dt_ker_clk_src = COND_CODE_1(DT_CLOCKS_HAS_NAME(DT_NODELABEL(spi1), kernel),
						  (DT_CLOCKS_CELL_BY_NAME(DT_NODELABEL(spi1),
									  kernel, bus)),
						  (DT_NO_CLOCK));
		spi1_actual_clk_src = __HAL_RCC_GET_SPI1_SOURCE();

		if (spi1_dt_ker_clk_src == STM32_SRC_PLL1_Q) {
			zassert_equal(spi1_actual_clk_src, RCC_SPI123CLKSOURCE_PLL,
					"Expected SPI src: PLLQ (%d). Actual SPI src: %d",
					spi1_actual_clk_src, RCC_SPI123CLKSOURCE_PLL);
		} else if (spi1_dt_ker_clk_src == STM32_SRC_PLL3_P) {
			zassert_equal(spi1_actual_clk_src, RCC_SPI123CLKSOURCE_PLL3,
					"Expected SPI src: PLLQ (%d). Actual SPI src: %d",
					spi1_actual_clk_src, RCC_SPI123CLKSOURCE_PLL3);
		} else if (spi1_dt_ker_clk_src == STM32_SRC_CKPER) {
			zassert_equal(spi1_actual_clk_src, RCC_SPI123CLKSOURCE_CLKP,
					"Expected SPI src: PLLQ (%d). Actual SPI src: %d",
					spi1_actual_clk_src, RCC_SPI123CLKSOURCE_CLKP);
		} else {
			zassert_true(1, "Unexpected ker_clk src(%d)", spi1_dt_ker_clk_src);
		}

		/* Test get_rate(ker_clk) */
		r = clock_control_get_rate(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
					(clock_control_subsys_t) &spi1_ker_clk_cfg,
					&spi1_dt_clk_freq);
		zassert_true((r == 0), "Could not get SPI clk freq");

		spi1_actual_clk_freq = HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_SPI1);
		zassert_equal(spi1_dt_clk_freq, spi1_actual_clk_freq,
				"Expected SPI clk: (%d). Actual SPI clk: %d",
				spi1_dt_clk_freq, spi1_actual_clk_freq);
	} else {
		/* No alt clock available, get rate from reg_clk */

		/* Test get_rate(reg_clk) */
		r = clock_control_get_rate(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
					(clock_control_subsys_t) &spi1_reg_clk_cfg,
					&spi1_dt_clk_freq);
		zassert_true((r == 0), "Could not get SPI clk freq");

		spi1_actual_clk_freq = HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_SPI1);
		zassert_equal(spi1_dt_clk_freq, spi1_actual_clk_freq,
				"Expected SPI clk: (%d). Actual SPI clk: %d",
				spi1_dt_clk_freq, spi1_actual_clk_freq);
	}

	TC_PRINT("SPI1 clock freq: %d(MHz)\n", spi1_actual_clk_freq / (1000*1000));

	/* Test clock_off(reg_clk) */
	r = clock_control_off(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
				(clock_control_subsys_t) &spi1_reg_clk_cfg);
	zassert_true((r == 0), "Could not disable SPI reg_clk");

	zassert_true(!__HAL_RCC_SPI1_IS_CLK_ENABLED(), "SPI1 reg_clk should be off");
	TC_PRINT("SPI1 reg_clk off\n");

	/* Test clock_off(ker_clk) */
	/* Not supported today */
}

void test_main(void)
{
	ztest_test_suite(test_stm32h7_devices_clocks,
		ztest_unit_test(test_sysclk_freq),
		ztest_unit_test(test_spi_clk_config)
			 );
	ztest_run_test_suite(test_stm32h7_devices_clocks);
}