/* Copyright 2023 The ChromiumOS Authors
 * SPDX-License-Identifier: Apache-2.0
 */
#include <zephyr/arch/cpu.h>
#include <zephyr/device.h>

#define DT_DRV_COMPAT mediatek_adsp_intc

struct intc_mtk_cfg {
	uint32_t xtensa_irq;
	uint32_t irq_mask;
	uint32_t sw_isr_off;
	volatile uint32_t *enable_reg;
	volatile uint32_t *status_reg;
};

bool intc_mtk_adsp_get_enable(const struct device *dev, int irq)
{
	const struct intc_mtk_cfg *cfg = dev->config;

	return (*cfg->enable_reg | (BIT(irq) & cfg->irq_mask)) != 0;
}

void intc_mtk_adsp_set_enable(const struct device *dev, int irq, bool val)
{
	const struct intc_mtk_cfg *cfg = dev->config;

	irq_enable(cfg->xtensa_irq);

	if ((BIT(irq) & cfg->irq_mask) != 0) {
		if (val) {
			*cfg->enable_reg |= BIT(irq);
		} else {
			*cfg->enable_reg &= ~BIT(irq);
		}
	}
}

static void intc_isr(const void *arg)
{
	const struct intc_mtk_cfg *cfg = ((struct device *)arg)->config;
	uint32_t irqs = *cfg->status_reg & cfg->irq_mask;

	while (irqs != 0) {
		uint32_t irq = find_msb_set(irqs) - 1;
		uint32_t off = cfg->sw_isr_off + irq;

		_sw_isr_table[off].isr(_sw_isr_table[off].arg);
		irqs &= ~BIT(irq);
	}
}

static void dev_init(const struct device *dev)
{
	const struct intc_mtk_cfg *cfg = dev->config;

	*cfg->enable_reg = 0;
	irq_enable(cfg->xtensa_irq);
}

#define DEV_INIT(N) \
	IRQ_CONNECT(DT_INST_IRQN(N), 0, intc_isr, DEVICE_DT_INST_GET(N), 0); \
	dev_init(DEVICE_DT_INST_GET(N));

static int intc_init(void)
{
	DT_INST_FOREACH_STATUS_OKAY(DEV_INIT);
	return 0;
}

SYS_INIT(intc_init, PRE_KERNEL_1, 0);

#define DEF_DEV(N)						\
static const struct intc_mtk_cfg dev_cfg##N = {			\
	.xtensa_irq = DT_INST_IRQN(N),				\
	.irq_mask   = DT_INST_PROP(N, mask),			\
	.sw_isr_off = (N + 1) * 32,				\
	.enable_reg = (void *)DT_INST_REG_ADDR(N),		\
	.status_reg = (void *)DT_INST_PROP(N, status_reg) };	\
DEVICE_DT_INST_DEFINE(N, NULL, NULL, NULL, &dev_cfg##N, PRE_KERNEL_1, 0, NULL);

DT_INST_FOREACH_STATUS_OKAY(DEF_DEV);