drivers/media/pci/cx18/cx18-irq.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  cx18 interrupt handling
   4  *
   5  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   6  *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
   7  */
   8
   9 #include "cx18-driver.h"
  10 #include "cx18-io.h"
  11 #include "cx18-irq.h"
  12 #include "cx18-mailbox.h"
  13 #include "cx18-scb.h"
  14
  15 static void xpu_ack(struct cx18 *cx, u32 sw2)
  16 {
  17         if (sw2 & IRQ_CPU_TO_EPU_ACK)
  18                 wake_up(&cx->mb_cpu_waitq);
  19         if (sw2 & IRQ_APU_TO_EPU_ACK)
  20                 wake_up(&cx->mb_apu_waitq);
  21 }
  22
  23 static void epu_cmd(struct cx18 *cx, u32 sw1)
  24 {
  25         if (sw1 & IRQ_CPU_TO_EPU)
  26                 cx18_api_epu_cmd_irq(cx, CPU);
  27         if (sw1 & IRQ_APU_TO_EPU)
  28                 cx18_api_epu_cmd_irq(cx, APU);
  29 }
  30
  31 irqreturn_t cx18_irq_handler(int irq, void *dev_id)
  32 {
  33         struct cx18 *cx = (struct cx18 *)dev_id;
  34         u32 sw1, sw2, hw2;
  35
  36         sw1 = cx18_read_reg(cx, SW1_INT_STATUS) & cx->sw1_irq_mask;
  37         sw2 = cx18_read_reg(cx, SW2_INT_STATUS) & cx->sw2_irq_mask;
  38         hw2 = cx18_read_reg(cx, HW2_INT_CLR_STATUS) & cx->hw2_irq_mask;
  39
  40         if (sw1)
  41                 cx18_write_reg_expect(cx, sw1, SW1_INT_STATUS, ~sw1, sw1);
  42         if (sw2)
  43                 cx18_write_reg_expect(cx, sw2, SW2_INT_STATUS, ~sw2, sw2);
  44         if (hw2)
  45                 cx18_write_reg_expect(cx, hw2, HW2_INT_CLR_STATUS, ~hw2, hw2);
  46
  47         if (sw1 || sw2 || hw2)
  48                 CX18_DEBUG_HI_IRQ("received interrupts SW1: %x  SW2: %x  HW2: %x\n",
  49                                   sw1, sw2, hw2);
  50
  51         /*
  52          * SW1 responses have to happen first.  The sending XPU times out the
  53          * incoming mailboxes on us rather rapidly.
  54          */
  55         if (sw1)
  56                 epu_cmd(cx, sw1);
  57
  58         /* To do: interrupt-based I2C handling
  59         if (hw2 & (HW2_I2C1_INT|HW2_I2C2_INT)) {
  60         }
  61         */
  62
  63         if (sw2)
  64                 xpu_ack(cx, sw2);
  65
  66         return (sw1 || sw2 || hw2) ? IRQ_HANDLED : IRQ_NONE;
  67 }