drivers/misc/mediatek/mtee/tz_irq.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2021 MediaTek Inc.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/irqdomain.h>
#include <linux/of_irq.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>

#include "tz_cross/trustzone.h"
#include "tz_cross/ta_system.h"
#include "tz_cross/ta_irq.h"
#include "trustzone/kree/system.h"
#include "kree_int.h"

static struct irq_domain *sysirq;
static struct device_node *sysirq_node;

/*************************************************************
 *           REE Service
 *************************************************************/
static irqreturn_t KREE_IrqHandler(int virq, void *dev)
{
	struct irq_data *data = irq_get_irq_data(virq);
	uint32_t paramTypes;
	union MTEEC_PARAM param[4];
	int ret;

	if (!data)
		return IRQ_NONE;

	param[0].value.a = (uint32_t) irqd_to_hwirq(data);
	paramTypes = TZ_ParamTypes1(TZPT_VALUE_INPUT);
	ret = KREE_TeeServiceCall(
			(KREE_SESSION_HANDLE) MTEE_SESSION_HANDLE_SYSTEM,
			TZCMD_SYS_IRQ, paramTypes, param);
	return (ret == TZ_RESULT_SUCCESS) ? IRQ_HANDLED : IRQ_NONE;
}

static unsigned int tz_hwirq_to_virq(unsigned int hwirq, unsigned long flags)
{
	struct of_phandle_args oirq;

	if (sysirq_node) {
		oirq.np = sysirq_node;
		oirq.args_count = 3;
		oirq.args[0] = GIC_SPI;
		oirq.args[1] = hwirq - 32;
		oirq.args[2] = flags;
		return irq_create_of_mapping(&oirq);
	}

	return hwirq;
}

int KREE_ServRequestIrq(u32 op, u8 uparam[REE_SERVICE_BUFFER_SIZE])
{
	struct ree_service_irq *param = (struct ree_service_irq *)uparam;
	int rret;
	unsigned long flags;
	int ret = TZ_RESULT_SUCCESS;
	unsigned int *token;
	unsigned int virq;

	if (param->enable) {
		flags = 0;
		if (param->flags & MTIRQF_SHARED)
			flags |= IRQF_SHARED;
		if (param->flags & MTIRQF_TRIGGER_LOW)
			flags |= IRQF_TRIGGER_LOW;
		else if (param->flags & MTIRQF_TRIGGER_HIGH)
			flags |= IRQF_TRIGGER_HIGH;
		else if (param->flags & MTIRQF_TRIGGER_RISING)
			flags |= IRQF_TRIGGER_RISING;
		else if (param->flags & MTIRQF_TRIGGER_FALLING)
			flags |= IRQF_TRIGGER_FALLING;

		/* Generate a token if not already exists.
		 * Token is used as device for Share IRQ
		 */
		token = 0;
		if (!param->token64) {
			token = kmalloc(sizeof(unsigned int), GFP_KERNEL);
			if (!token)
				return TZ_RESULT_ERROR_OUT_OF_MEMORY;
			*token = param->irq;
			param->token64 = (uint64_t)(unsigned long)token;
		}

		virq = tz_hwirq_to_virq(param->irq, flags);

		if (virq > 0)
			rret = request_irq(virq, KREE_IrqHandler, flags,
					"TEE IRQ",
					(void *)(unsigned long)param->token64);
		else
			rret = -EINVAL;

		if (rret) {
			kfree(token);
			pr_warn("%s (virq:%d, hwirq:%d) return error: %d\n",
				__func__, virq, param->irq, rret);
			if (rret == -ENOMEM)
				ret = TZ_RESULT_ERROR_OUT_OF_MEMORY;
			else
				ret = TZ_RESULT_ERROR_BAD_PARAMETERS;
		}
	} else {
		if (sysirq)
			virq = irq_find_mapping(sysirq, param->irq);
		else
			virq = param->irq;

		if (virq) {
			free_irq(virq, (void *)(unsigned long)param->token64);
			if (param->token64 &&
			    *(unsigned int *)(unsigned long)param->token64 ==
								param->irq)
				kfree((void *)(unsigned long)param->token64);
		}
	}
	return ret;
}

int KREE_ServEnableIrq(u32 op, u8 uparam[REE_SERVICE_BUFFER_SIZE])
{
	struct ree_service_irq *param = (struct ree_service_irq *)uparam;
	unsigned int virq;

	virq = tz_hwirq_to_virq(param->irq, 0);
	if (virq > 0) {
		if (param->enable)
			enable_irq(virq);
		else
			disable_irq(virq);

		return TZ_RESULT_SUCCESS;
	}

	return TZ_RESULT_ERROR_BAD_PARAMETERS;
}


/*************************************************************
 *           TEE Service
 *************************************************************/
static KREE_SESSION_HANDLE irq_session;

void kree_irq_init(void)
{
	int ret;

	ret = KREE_CreateSession(TZ_TA_IRQ_UUID, &irq_session);
	if (ret != TZ_RESULT_SUCCESS) {
		pr_warn("%s: CreateSession error %d\n", __func__, ret);
		return;
	}
}

int kree_set_fiq(int irq, unsigned long irq_flags)
{
	union MTEEC_PARAM param[4];
	int ret;
	unsigned long tz_irq_flags = 0;

	if (irq_flags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
		tz_irq_flags |= TZ_IRQF_EDGE_SENSITIVE;
		tz_irq_flags |=
		(irq_flags & IRQF_TRIGGER_FALLING) ? TZ_IRQF_LOW : TZ_IRQF_HIGH;
	} else if (irq_flags & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) {
		tz_irq_flags |= TZ_IRQF_LEVEL_SENSITIVE;
		tz_irq_flags |=
		(irq_flags & IRQF_TRIGGER_LOW) ? TZ_IRQF_LOW : TZ_IRQF_HIGH;
	}

	param[0].value.a = irq;
	param[1].value.a = tz_irq_flags;
	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_SET_FIQ,
					TZ_ParamTypes2(TZPT_VALUE_INPUT,
							TZPT_VALUE_INPUT),
					param);
	if (ret != TZ_RESULT_SUCCESS)
		pr_warn("%s error: %s\n", __func__, TZ_GetErrorString(ret));

	return ret;
}

static void __kree_enable_fiq(int irq, int enable)
{
	union MTEEC_PARAM param[4];
	int ret;

	param[0].value.a = irq;
	param[1].value.a = enable;
	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_ENABLE_FIQ,
					TZ_ParamTypes2(TZPT_VALUE_INPUT,
							TZPT_VALUE_INPUT),
					param);
	if (ret != TZ_RESULT_SUCCESS)
		pr_warn("%s error: %s\n", __func__, TZ_GetErrorString(ret));

}

void kree_enable_fiq(int irq)
{
	__kree_enable_fiq(irq, 1);
}

void kree_disable_fiq(int irq)
{
	__kree_enable_fiq(irq, 0);
}

void kree_query_fiq(int irq, int *enable, int *pending)
{
	union MTEEC_PARAM param[4];
	int ret;

	param[0].value.a = irq;
	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_QUERY_FIQ,
					TZ_ParamTypes2(TZPT_VALUE_INPUT,
							TZPT_VALUE_OUTPUT),
					param);
	if (ret != TZ_RESULT_SUCCESS) {
		pr_warn("%s error: %s\n", __func__, TZ_GetErrorString(ret));
		param[1].value.a = 0;
	}

	*enable = param[1].value.a & 1;
	*pending = (param[1].value.a & 2) != 0;
}

unsigned int kree_fiq_get_intack(void)
{
	union MTEEC_PARAM param[4];
	int ret;

	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_GET_INTACK,
				  TZ_ParamTypes1(TZPT_VALUE_OUTPUT), param);
	if (ret == TZ_RESULT_SUCCESS)
		return param[0].value.a;

	return 0xffff;
}

void kree_fiq_eoi(unsigned int iar)
{
	int ret;
	union MTEEC_PARAM param[4];

	param[0].value.a = iar;
	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_EOI,
				TZ_ParamTypes1(TZPT_VALUE_INPUT), param);
	if (ret != TZ_RESULT_SUCCESS)
		pr_warn("%s() fails! ret=0x%x\n", __func__, ret);
}

int kree_raise_softfiq(unsigned int mask, unsigned int irq)
{
	union MTEEC_PARAM param[4];
	int ret;

	param[0].value.a = mask;
	param[1].value.a = irq;
	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_TRIGGER_SGI,
					TZ_ParamTypes2(TZPT_VALUE_INPUT,
							TZPT_VALUE_INPUT),
					param);
	return ret == TZ_RESULT_SUCCESS;
}

void kree_irq_mask_all(unsigned int *pmask, unsigned int size)
{
	union MTEEC_PARAM param[4];
	int ret;

	param[0].mem.buffer = pmask;
	param[0].mem.size = size;
	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_MASK_ALL,
				  TZ_ParamTypes1(TZPT_MEM_OUTPUT), param);
	if (ret != TZ_RESULT_SUCCESS)
		pr_warn("%s error: %s\n", __func__, TZ_GetErrorString(ret));
}

void kree_irq_mask_restore(unsigned int *pmask, unsigned int size)
{
	union MTEEC_PARAM param[4];
	int ret;

	param[0].mem.buffer = pmask;
	param[0].mem.size = size;
	ret = KREE_TeeServiceCall(irq_session, TZCMD_IRQ_MASK_RESTORE,
				  TZ_ParamTypes1(TZPT_MEM_INPUT), param);
	if (ret != TZ_RESULT_SUCCESS)
		pr_warn("%s error: %s\n", __func__, TZ_GetErrorString(ret));
}

void kree_set_sysirq_node(struct device_node *pnode)
{
	if (pnode) {
		sysirq_node = pnode;
		sysirq = irq_find_host(sysirq_node);
	}
}