summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/vc4/vc4_hvs.c
blob: 8098c5b21ba447c43a16c7a62b9a4de0590abe1f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/*
 * Copyright (C) 2015 Broadcom
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/**
 * DOC: VC4 HVS module.
 *
 * The HVS is the piece of hardware that does translation, scaling,
 * colorspace conversion, and compositing of pixels stored in
 * framebuffers into a FIFO of pixels going out to the Pixel Valve
 * (CRTC).  It operates at the system clock rate (the system audio
 * clock gate, specifically), which is much higher than the pixel
 * clock rate.
 *
 * There is a single global HVS, with multiple output FIFOs that can
 * be consumed by the PVs.  This file just manages the resources for
 * the HVS, while the vc4_crtc.c code actually drives HVS setup for
 * each CRTC.
 */

#include "linux/component.h"
#include "vc4_drv.h"
#include "vc4_regs.h"

#define HVS_REG(reg) { reg, #reg }
static const struct {
	u32 reg;
	const char *name;
} hvs_regs[] = {
	HVS_REG(SCALER_DISPCTRL),
	HVS_REG(SCALER_DISPSTAT),
	HVS_REG(SCALER_DISPID),
	HVS_REG(SCALER_DISPECTRL),
	HVS_REG(SCALER_DISPPROF),
	HVS_REG(SCALER_DISPDITHER),
	HVS_REG(SCALER_DISPEOLN),
	HVS_REG(SCALER_DISPLIST0),
	HVS_REG(SCALER_DISPLIST1),
	HVS_REG(SCALER_DISPLIST2),
	HVS_REG(SCALER_DISPLSTAT),
	HVS_REG(SCALER_DISPLACT0),
	HVS_REG(SCALER_DISPLACT1),
	HVS_REG(SCALER_DISPLACT2),
	HVS_REG(SCALER_DISPCTRL0),
	HVS_REG(SCALER_DISPBKGND0),
	HVS_REG(SCALER_DISPSTAT0),
	HVS_REG(SCALER_DISPBASE0),
	HVS_REG(SCALER_DISPCTRL1),
	HVS_REG(SCALER_DISPBKGND1),
	HVS_REG(SCALER_DISPSTAT1),
	HVS_REG(SCALER_DISPBASE1),
	HVS_REG(SCALER_DISPCTRL2),
	HVS_REG(SCALER_DISPBKGND2),
	HVS_REG(SCALER_DISPSTAT2),
	HVS_REG(SCALER_DISPBASE2),
	HVS_REG(SCALER_DISPALPHA2),
};

void vc4_hvs_dump_state(struct drm_device *dev)
{
	struct vc4_dev *vc4 = to_vc4_dev(dev);
	int i;

	for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
		DRM_INFO("0x%04x (%s): 0x%08x\n",
			 hvs_regs[i].reg, hvs_regs[i].name,
			 HVS_READ(hvs_regs[i].reg));
	}

	DRM_INFO("HVS ctx:\n");
	for (i = 0; i < 64; i += 4) {
		DRM_INFO("0x%08x (%s): 0x%08x 0x%08x 0x%08x 0x%08x\n",
			 i * 4, i < HVS_BOOTLOADER_DLIST_END ? "B" : "D",
			 readl((u32 __iomem *)vc4->hvs->dlist + i + 0),
			 readl((u32 __iomem *)vc4->hvs->dlist + i + 1),
			 readl((u32 __iomem *)vc4->hvs->dlist + i + 2),
			 readl((u32 __iomem *)vc4->hvs->dlist + i + 3));
	}
}

#ifdef CONFIG_DEBUG_FS
int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *)m->private;
	struct drm_device *dev = node->minor->dev;
	struct vc4_dev *vc4 = to_vc4_dev(dev);
	int i;

	for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
		seq_printf(m, "%s (0x%04x): 0x%08x\n",
			   hvs_regs[i].name, hvs_regs[i].reg,
			   HVS_READ(hvs_regs[i].reg));
	}

	return 0;
}
#endif

static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct drm_device *drm = dev_get_drvdata(master);
	struct vc4_dev *vc4 = drm->dev_private;
	struct vc4_hvs *hvs = NULL;

	hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL);
	if (!hvs)
		return -ENOMEM;

	hvs->pdev = pdev;

	hvs->regs = vc4_ioremap_regs(pdev, 0);
	if (IS_ERR(hvs->regs))
		return PTR_ERR(hvs->regs);

	hvs->dlist = hvs->regs + SCALER_DLIST_START;

	vc4->hvs = hvs;
	return 0;
}

static void vc4_hvs_unbind(struct device *dev, struct device *master,
			   void *data)
{
	struct drm_device *drm = dev_get_drvdata(master);
	struct vc4_dev *vc4 = drm->dev_private;

	vc4->hvs = NULL;
}

static const struct component_ops vc4_hvs_ops = {
	.bind   = vc4_hvs_bind,
	.unbind = vc4_hvs_unbind,
};

static int vc4_hvs_dev_probe(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &vc4_hvs_ops);
}

static int vc4_hvs_dev_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &vc4_hvs_ops);
	return 0;
}

static const struct of_device_id vc4_hvs_dt_match[] = {
	{ .compatible = "brcm,bcm2835-hvs" },
	{}
};

struct platform_driver vc4_hvs_driver = {
	.probe = vc4_hvs_dev_probe,
	.remove = vc4_hvs_dev_remove,
	.driver = {
		.name = "vc4_hvs",
		.of_match_table = vc4_hvs_dt_match,
	},
};