diff options
Diffstat (limited to 'drivers/media/pci/cx18/cx18-irq.c')
| -rw-r--r-- | drivers/media/pci/cx18/cx18-irq.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-irq.c b/drivers/media/pci/cx18/cx18-irq.c new file mode 100644 index 000000000..db6307782 --- /dev/null +++ b/drivers/media/pci/cx18/cx18-irq.c @@ -0,0 +1,67 @@ +// 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 = 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; +} |