// SPDX-License-Identifier: GPL-2.0-or-later /* * cx18 interrupt handling * * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net> */ #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; }