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/*

 * Copyright (C) 2006 Ondrej Palkovsky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** IRQ notification framework

 *

 * This framework allows applications to register to receive a notification

 * when interrupt is detected. The application may provide a simple 'top-half'

 * handler as part of its registration, which can perform simple operations

 * (read/write port/memory, add information to notification ipc message).

 *

 * The structure of a notification message is as follows:

 * - METHOD: IPC_M_INTERRUPT

 * - ARG1: interrupt number

 * - ARG2: payload modified by a 'top-half' handler

 * - ARG3: interrupt counter (may be needed to assure correct order

 *         in multithreaded drivers)

 */

#include <arch.h>

#include <mm/slab.h>

#include <errno.h>

#include <ipc/ipc.h>

#include <ipc/irq.h>

#include <atomic.h>

#include <syscall/copy.h>

typedef struct {

	SPINLOCK_DECLARE(lock);

	answerbox_t *box;

	irq_code_t *code;

	atomic_t counter;

} ipc_irq_t;

static ipc_irq_t *irq_conns = NULL;

static int irq_conns_size;

#include <print.h>

/* Execute code associated with IRQ notification */

static void code_execute(call_t *call, irq_code_t *code)

{

	int i;

	if (!code)

		return;

	for (i=0; i < code->cmdcount;i++) {

		switch (code->cmds[i].cmd) {

		case CMD_MEM_READ_1:

			IPC_SET_ARG2(call->data, *((__u8 *)code->cmds[i].addr));

			break;

		case CMD_MEM_READ_2:

			IPC_SET_ARG2(call->data, *((__u16 *)code->cmds[i].addr));

			break;

		case CMD_MEM_READ_4:

			IPC_SET_ARG2(call->data, *((__u32 *)code->cmds[i].addr));

			break;

		case CMD_MEM_READ_8:

			IPC_SET_ARG2(call->data, *((__u64 *)code->cmds[i].addr));

			break;

		case CMD_MEM_WRITE_1:

			*((__u8 *)code->cmds[i].addr) = code->cmds[i].value;

			break;

		case CMD_MEM_WRITE_2:

			*((__u16 *)code->cmds[i].addr) = code->cmds[i].value;

			break;

		case CMD_MEM_WRITE_4:

			*((__u32 *)code->cmds[i].addr) = code->cmds[i].value;

			break;

		case CMD_MEM_WRITE_8:

			*((__u64 *)code->cmds[i].addr) = code->cmds[i].value;

			break;

#if defined(ia32) || defined(amd64)

		case CMD_PORT_READ_1:

			IPC_SET_ARG2(call->data, inb((long)code->cmds[i].addr));

			break;

		case CMD_PORT_WRITE_1:

			outb((long)code->cmds[i].addr, code->cmds[i].value);

			break;

#endif

		default:

			break;

		}

	}

}

static void code_free(irq_code_t *code)

{

	if (code) {

		free(code->cmds);

		free(code);

	}

}

static irq_code_t * code_from_uspace(irq_code_t *ucode)

{

	irq_code_t *code;

	irq_cmd_t *ucmds;

	int rc;

	code = malloc(sizeof(*code), 0);

	rc = copy_from_uspace(code, ucode, sizeof(*code));

	if (rc != 0) {

		free(code);

		return NULL;

	}

	if (code->cmdcount > IRQ_MAX_PROG_SIZE) {

		free(code);

		return NULL;

	}

	ucmds = code->cmds;

	code->cmds = malloc(sizeof(code->cmds[0]) * (code->cmdcount), 0);

	rc = copy_from_uspace(code->cmds, ucmds, sizeof(code->cmds[0]) * (code->cmdcount));

	if (rc != 0) {

		free(code->cmds);

		free(code);

		return NULL;

	}

	return code;

}

/** Unregister task from irq */

void ipc_irq_unregister(answerbox_t *box, int irq)

{

	ipl_t ipl;

	ipl = interrupts_disable();

	spinlock_lock(&irq_conns[irq].lock);

	if (irq_conns[irq].box == box) {

		irq_conns[irq].box = NULL;

		code_free(irq_conns[irq].code);

		irq_conns[irq].code = NULL;

	}

	spinlock_unlock(&irq_conns[irq].lock);

	interrupts_restore(ipl);

}

/** Register an answerbox as a receiving end of interrupts notifications */

int ipc_irq_register(answerbox_t *box, int irq, irq_code_t *ucode)

{

	ipl_t ipl;

	irq_code_t *code;

	ASSERT(irq_conns);

	if (ucode) {

		code = code_from_uspace(ucode);

		if (!code)

			return EBADMEM;

	} else

		code = NULL;

	ipl = interrupts_disable();

	spinlock_lock(&irq_conns[irq].lock);

	if (irq_conns[irq].box) {

		spinlock_unlock(&irq_conns[irq].lock);

		interrupts_restore(ipl);

		code_free(code);

		return EEXISTS;

	}

	irq_conns[irq].box = box;

	irq_conns[irq].code = code;

	atomic_set(&irq_conns[irq].counter, 0);

	spinlock_unlock(&irq_conns[irq].lock);

	interrupts_restore(ipl);

	return 0;

}

/** Notify process that an irq had happend

 *

 * We expect interrupts to be disabled

 */

void ipc_irq_send_notif(int irq)

{

	call_t *call;

	ASSERT(irq_conns);

	spinlock_lock(&irq_conns[irq].lock);

	if (irq_conns[irq].box) {

		call = ipc_call_alloc(FRAME_ATOMIC);

		call->flags |= IPC_CALL_NOTIF;

		IPC_SET_METHOD(call->data, IPC_M_INTERRUPT);

		IPC_SET_ARG1(call->data, irq);

		IPC_SET_ARG3(call->data, atomic_preinc(&irq_conns[irq].counter));

		/* Execute code to handle irq */

		code_execute(call, irq_conns[irq].code);

		spinlock_lock(&irq_conns[irq].box->irq_lock);

		list_append(&call->list, &irq_conns[irq].box->irq_notifs);

		spinlock_unlock(&irq_conns[irq].box->irq_lock);

		waitq_wakeup(&irq_conns[irq].box->wq, 0);

	}

	spinlock_unlock(&irq_conns[irq].lock);

}

/** Initialize table of interrupt handlers */

void ipc_irq_make_table(int irqcount)

{

	int i;

	irq_conns_size = irqcount;

	irq_conns = malloc(irqcount * (sizeof(*irq_conns)), 0);

	for (i=0; i < irqcount; i++) {

		spinlock_initialize(&irq_conns[i].lock, "irq_ipc_lock");

		irq_conns[i].box = NULL;

		irq_conns[i].code = NULL;

	}

}

/** Disconnect all irq's notifications

 *

 * TODO: It may be better to do some linked list, so that

 *       we wouldn't need to go through whole array every cleanup

 */

void ipc_irq_cleanup(answerbox_t *box)

{

	int i;

	ipl_t ipl;

	for (i=0; i < irq_conns_size; i++) {

		ipl = interrupts_disable();

		spinlock_lock(&irq_conns[i].lock);

		if (irq_conns[i].box == box)

			irq_conns[i].box = NULL;

		spinlock_unlock(&irq_conns[i].lock);

		interrupts_restore(ipl);

	}

}