2 * Copyright (C) 2015 Broadcom
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
10 * DOC: VC4 HVS module.
12 * The HVS is the piece of hardware that does translation, scaling,
13 * colorspace conversion, and compositing of pixels stored in
14 * framebuffers into a FIFO of pixels going out to the Pixel Valve
15 * (CRTC). It operates at the system clock rate (the system audio
16 * clock gate, specifically), which is much higher than the pixel
19 * There is a single global HVS, with multiple output FIFOs that can
20 * be consumed by the PVs. This file just manages the resources for
21 * the HVS, while the vc4_crtc.c code actually drives HVS setup for
25 #include "linux/component.h"
29 #define HVS_REG(reg) { reg, #reg }
34 HVS_REG(SCALER_DISPCTRL),
35 HVS_REG(SCALER_DISPSTAT),
36 HVS_REG(SCALER_DISPID),
37 HVS_REG(SCALER_DISPECTRL),
38 HVS_REG(SCALER_DISPPROF),
39 HVS_REG(SCALER_DISPDITHER),
40 HVS_REG(SCALER_DISPEOLN),
41 HVS_REG(SCALER_DISPLIST0),
42 HVS_REG(SCALER_DISPLIST1),
43 HVS_REG(SCALER_DISPLIST2),
44 HVS_REG(SCALER_DISPLSTAT),
45 HVS_REG(SCALER_DISPLACT0),
46 HVS_REG(SCALER_DISPLACT1),
47 HVS_REG(SCALER_DISPLACT2),
48 HVS_REG(SCALER_DISPCTRL0),
49 HVS_REG(SCALER_DISPBKGND0),
50 HVS_REG(SCALER_DISPSTAT0),
51 HVS_REG(SCALER_DISPBASE0),
52 HVS_REG(SCALER_DISPCTRL1),
53 HVS_REG(SCALER_DISPBKGND1),
54 HVS_REG(SCALER_DISPSTAT1),
55 HVS_REG(SCALER_DISPBASE1),
56 HVS_REG(SCALER_DISPCTRL2),
57 HVS_REG(SCALER_DISPBKGND2),
58 HVS_REG(SCALER_DISPSTAT2),
59 HVS_REG(SCALER_DISPBASE2),
60 HVS_REG(SCALER_DISPALPHA2),
63 void vc4_hvs_dump_state(struct drm_device *dev)
65 struct vc4_dev *vc4 = to_vc4_dev(dev);
68 for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
69 DRM_INFO("0x%04x (%s): 0x%08x\n",
70 hvs_regs[i].reg, hvs_regs[i].name,
71 HVS_READ(hvs_regs[i].reg));
74 DRM_INFO("HVS ctx:\n");
75 for (i = 0; i < 64; i += 4) {
76 DRM_INFO("0x%08x (%s): 0x%08x 0x%08x 0x%08x 0x%08x\n",
77 i * 4, i < HVS_BOOTLOADER_DLIST_END ? "B" : "D",
78 readl((u32 __iomem *)vc4->hvs->dlist + i + 0),
79 readl((u32 __iomem *)vc4->hvs->dlist + i + 1),
80 readl((u32 __iomem *)vc4->hvs->dlist + i + 2),
81 readl((u32 __iomem *)vc4->hvs->dlist + i + 3));
85 #ifdef CONFIG_DEBUG_FS
86 int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused)
88 struct drm_info_node *node = (struct drm_info_node *)m->private;
89 struct drm_device *dev = node->minor->dev;
90 struct vc4_dev *vc4 = to_vc4_dev(dev);
93 for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
94 seq_printf(m, "%s (0x%04x): 0x%08x\n",
95 hvs_regs[i].name, hvs_regs[i].reg,
96 HVS_READ(hvs_regs[i].reg));
103 static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
105 struct platform_device *pdev = to_platform_device(dev);
106 struct drm_device *drm = dev_get_drvdata(master);
107 struct vc4_dev *vc4 = drm->dev_private;
108 struct vc4_hvs *hvs = NULL;
110 hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL);
116 hvs->regs = vc4_ioremap_regs(pdev, 0);
117 if (IS_ERR(hvs->regs))
118 return PTR_ERR(hvs->regs);
120 hvs->dlist = hvs->regs + SCALER_DLIST_START;
126 static void vc4_hvs_unbind(struct device *dev, struct device *master,
129 struct drm_device *drm = dev_get_drvdata(master);
130 struct vc4_dev *vc4 = drm->dev_private;
135 static const struct component_ops vc4_hvs_ops = {
136 .bind = vc4_hvs_bind,
137 .unbind = vc4_hvs_unbind,
140 static int vc4_hvs_dev_probe(struct platform_device *pdev)
142 return component_add(&pdev->dev, &vc4_hvs_ops);
145 static int vc4_hvs_dev_remove(struct platform_device *pdev)
147 component_del(&pdev->dev, &vc4_hvs_ops);
151 static const struct of_device_id vc4_hvs_dt_match[] = {
152 { .compatible = "brcm,bcm2835-hvs" },
156 struct platform_driver vc4_hvs_driver = {
157 .probe = vc4_hvs_dev_probe,
158 .remove = vc4_hvs_dev_remove,
161 .of_match_table = vc4_hvs_dt_match,