cx18-irq.c

Go to the documentation of this file.

/*
 *  cx18 interrupt handling
 *
 *  Copyright (C) 2007  Hans Verkuil <[email protected]>
 *  Copyright (C) 2008  Andy Walls <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA
 */

#include "cx18-driver.h"
#include "cx18-io.h"
#include "cx18-irq.h"
#include "cx18-mailbox.h"
#include "cx18-scb.h"

static void xpu_ack(struct cx18 *cx, u32 sw2)
{
    if (sw2 & IRQ_CPU_TO_EPU_ACK)
        wake_up(&cx->mb_cpu_waitq);
    if (sw2 & IRQ_APU_TO_EPU_ACK)
        wake_up(&cx->mb_apu_waitq);
}

static void epu_cmd(struct cx18 *cx, u32 sw1)
{
    if (sw1 & IRQ_CPU_TO_EPU)
        cx18_api_epu_cmd_irq(cx, CPU);
    if (sw1 & IRQ_APU_TO_EPU)
        cx18_api_epu_cmd_irq(cx, APU);
}

irqreturn_t cx18_irq_handler(int irq, void *dev_id)
{
    struct cx18 *cx = (struct cx18 *)dev_id;
    u32 sw1, sw2, hw2;

    sw1 = cx18_read_reg(cx, SW1_INT_STATUS) & cx->sw1_irq_mask;
    sw2 = cx18_read_reg(cx, SW2_INT_STATUS) & cx->sw2_irq_mask;
    hw2 = cx18_read_reg(cx, HW2_INT_CLR_STATUS) & cx->hw2_irq_mask;

    if (sw1)
        cx18_write_reg_expect(cx, sw1, SW1_INT_STATUS, ~sw1, sw1);
    if (sw2)
        cx18_write_reg_expect(cx, sw2, SW2_INT_STATUS, ~sw2, sw2);
    if (hw2)
        cx18_write_reg_expect(cx, hw2, HW2_INT_CLR_STATUS, ~hw2, hw2);

    if (sw1 || sw2 || hw2)
        CX18_DEBUG_HI_IRQ("received interrupts "
                  "SW1: %x  SW2: %x  HW2: %x\n", sw1, sw2, hw2);

    /*
     * SW1 responses have to happen first.  The sending XPU times out the
     * incoming mailboxes on us rather rapidly.
     */
    if (sw1)
        epu_cmd(cx, sw1);

    /* To do: interrupt-based I2C handling
    if (hw2 & (HW2_I2C1_INT|HW2_I2C2_INT)) {
    }
    */

    if (sw2)
        xpu_ack(cx, sw2);

    return (sw1 || sw2 || hw2) ? IRQ_HANDLED : IRQ_NONE;
}