2 * cx18 interrupt handling
4 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
5 * Copyright (C) 2008 Andy Walls <awalls@radix.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include "cx18-driver.h"
26 #include "cx18-mailbox.h"
29 static void xpu_ack(struct cx18 *cx, u32 sw2)
31 if (sw2 & IRQ_CPU_TO_EPU_ACK)
32 wake_up(&cx->mb_cpu_waitq);
33 if (sw2 & IRQ_APU_TO_EPU_ACK)
34 wake_up(&cx->mb_apu_waitq);
37 static void epu_cmd(struct cx18 *cx, u32 sw1)
39 if (sw1 & IRQ_CPU_TO_EPU)
40 cx18_api_epu_cmd_irq(cx, CPU);
41 if (sw1 & IRQ_APU_TO_EPU)
42 cx18_api_epu_cmd_irq(cx, APU);
45 irqreturn_t cx18_irq_handler(int irq, void *dev_id)
47 struct cx18 *cx = (struct cx18 *)dev_id;
50 sw1 = cx18_read_reg(cx, SW1_INT_STATUS) & cx->sw1_irq_mask;
51 sw2 = cx18_read_reg(cx, SW2_INT_STATUS) & cx->sw2_irq_mask;
52 hw2 = cx18_read_reg(cx, HW2_INT_CLR_STATUS) & cx->hw2_irq_mask;
55 cx18_write_reg_expect(cx, sw1, SW1_INT_STATUS, ~sw1, sw1);
57 cx18_write_reg_expect(cx, sw2, SW2_INT_STATUS, ~sw2, sw2);
59 cx18_write_reg_expect(cx, hw2, HW2_INT_CLR_STATUS, ~hw2, hw2);
61 if (sw1 || sw2 || hw2)
62 CX18_DEBUG_HI_IRQ("received interrupts "
63 "SW1: %x SW2: %x HW2: %x\n", sw1, sw2, hw2);
66 * SW1 responses have to happen first. The sending XPU times out the
67 * incoming mailboxes on us rather rapidly.
72 /* To do: interrupt-based I2C handling
73 if (hw2 & (HW2_I2C1_INT|HW2_I2C2_INT)) {
80 return (sw1 || sw2 || hw2) ? IRQ_HANDLED : IRQ_NONE;