/*
* 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,
},
};
