1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2023 Loongson Technology Corporation Limited
4 */
5
6#include <drm/drm_vblank.h>
7
8#include "lsdc_irq.h"
9
10/*
11 * For the DC in LS7A2000, clearing interrupt status is achieved by
12 * write "1" to LSDC_INT_REG.
13 *
14 * For the DC in LS7A1000, clear interrupt status is achieved by write "0"
15 * to LSDC_INT_REG.
16 *
17 * Two different hardware engineers modify it as their will.
18 */
19
20irqreturn_t ls7a2000_dc_irq_handler(int irq, void *arg)
21{
22	struct drm_device *ddev = arg;
23	struct lsdc_device *ldev = to_lsdc(ddev);
24	u32 val;
25
26	/* Read the interrupt status */
27	val = lsdc_rreg32(ldev, LSDC_INT_REG);
28	if ((val & INT_STATUS_MASK) == 0) {
29		drm_warn(ddev, "no interrupt occurs\n");
30		return IRQ_NONE;
31	}
32
33	ldev->irq_status = val;
34
35	/* write "1" to clear the interrupt status */
36	lsdc_wreg32(ldev, LSDC_INT_REG, val);
37
38	if (ldev->irq_status & INT_CRTC0_VSYNC)
39		drm_handle_vblank(ddev, 0);
40
41	if (ldev->irq_status & INT_CRTC1_VSYNC)
42		drm_handle_vblank(ddev, 1);
43
44	return IRQ_HANDLED;
45}
46
47/* For the DC in LS7A1000 and LS2K1000 */
48irqreturn_t ls7a1000_dc_irq_handler(int irq, void *arg)
49{
50	struct drm_device *ddev = arg;
51	struct lsdc_device *ldev = to_lsdc(ddev);
52	u32 val;
53
54	/* Read the interrupt status */
55	val = lsdc_rreg32(ldev, LSDC_INT_REG);
56	if ((val & INT_STATUS_MASK) == 0) {
57		drm_warn(ddev, "no interrupt occurs\n");
58		return IRQ_NONE;
59	}
60
61	ldev->irq_status = val;
62
63	/* write "0" to clear the interrupt status */
64	val &= ~(INT_CRTC0_VSYNC | INT_CRTC1_VSYNC);
65	lsdc_wreg32(ldev, LSDC_INT_REG, val);
66
67	if (ldev->irq_status & INT_CRTC0_VSYNC)
68		drm_handle_vblank(ddev, 0);
69
70	if (ldev->irq_status & INT_CRTC1_VSYNC)
71		drm_handle_vblank(ddev, 1);
72
73	return IRQ_HANDLED;
74}
75