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Commit | Line | Data |
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1c1e45d1 HV |
1 | /* |
2 | * cx18 interrupt handling | |
3 | * | |
4 | * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> | |
6afdeaf8 | 5 | * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net> |
1c1e45d1 HV |
6 | * |
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. | |
11 | * | |
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. | |
1c1e45d1 HV |
16 | */ |
17 | ||
18 | #include "cx18-driver.h" | |
b1526421 | 19 | #include "cx18-io.h" |
1c1e45d1 | 20 | #include "cx18-irq.h" |
1c1e45d1 | 21 | #include "cx18-mailbox.h" |
1c1e45d1 | 22 | #include "cx18-scb.h" |
465f8a80 AW |
23 | |
24 | static void xpu_ack(struct cx18 *cx, u32 sw2) | |
25 | { | |
26 | if (sw2 & IRQ_CPU_TO_EPU_ACK) | |
27 | wake_up(&cx->mb_cpu_waitq); | |
28 | if (sw2 & IRQ_APU_TO_EPU_ACK) | |
29 | wake_up(&cx->mb_apu_waitq); | |
1c1e45d1 HV |
30 | } |
31 | ||
ee2d64f5 AW |
32 | static void epu_cmd(struct cx18 *cx, u32 sw1) |
33 | { | |
34 | if (sw1 & IRQ_CPU_TO_EPU) | |
35 | cx18_api_epu_cmd_irq(cx, CPU); | |
36 | if (sw1 & IRQ_APU_TO_EPU) | |
37 | cx18_api_epu_cmd_irq(cx, APU); | |
38 | } | |
39 | ||
1c1e45d1 HV |
40 | irqreturn_t cx18_irq_handler(int irq, void *dev_id) |
41 | { | |
42 | struct cx18 *cx = (struct cx18 *)dev_id; | |
d6c7e5f8 | 43 | u32 sw1, sw2, hw2; |
1c1e45d1 | 44 | |
d6c7e5f8 AW |
45 | sw1 = cx18_read_reg(cx, SW1_INT_STATUS) & cx->sw1_irq_mask; |
46 | sw2 = cx18_read_reg(cx, SW2_INT_STATUS) & cx->sw2_irq_mask; | |
47 | hw2 = cx18_read_reg(cx, HW2_INT_CLR_STATUS) & cx->hw2_irq_mask; | |
1c1e45d1 | 48 | |
f056d29e AW |
49 | if (sw1) |
50 | cx18_write_reg_expect(cx, sw1, SW1_INT_STATUS, ~sw1, sw1); | |
51 | if (sw2) | |
52 | cx18_write_reg_expect(cx, sw2, SW2_INT_STATUS, ~sw2, sw2); | |
53 | if (hw2) | |
54 | cx18_write_reg_expect(cx, hw2, HW2_INT_CLR_STATUS, ~hw2, hw2); | |
1c1e45d1 HV |
55 | |
56 | if (sw1 || sw2 || hw2) | |
6beb1388 MCC |
57 | CX18_DEBUG_HI_IRQ("received interrupts SW1: %x SW2: %x HW2: %x\n", |
58 | sw1, sw2, hw2); | |
1c1e45d1 | 59 | |
ee2d64f5 AW |
60 | /* |
61 | * SW1 responses have to happen first. The sending XPU times out the | |
62 | * incoming mailboxes on us rather rapidly. | |
63 | */ | |
64 | if (sw1) | |
65 | epu_cmd(cx, sw1); | |
66 | ||
1c1e45d1 | 67 | /* To do: interrupt-based I2C handling |
465f8a80 | 68 | if (hw2 & (HW2_I2C1_INT|HW2_I2C2_INT)) { |
1c1e45d1 HV |
69 | } |
70 | */ | |
71 | ||
465f8a80 AW |
72 | if (sw2) |
73 | xpu_ack(cx, sw2); | |
1c1e45d1 | 74 | |
f056d29e | 75 | return (sw1 || sw2 || hw2) ? IRQ_HANDLED : IRQ_NONE; |
1c1e45d1 | 76 | } |