2015-03-02 14:01:12 -07:00
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/*
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* Copyright (C) 2015 Broadcom
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/**
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* DOC: VC4 HVS module.
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*
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* The HVS is the piece of hardware that does translation, scaling,
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* colorspace conversion, and compositing of pixels stored in
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* framebuffers into a FIFO of pixels going out to the Pixel Valve
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* (CRTC). It operates at the system clock rate (the system audio
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* clock gate, specifically), which is much higher than the pixel
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* clock rate.
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*
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* There is a single global HVS, with multiple output FIFOs that can
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* be consumed by the PVs. This file just manages the resources for
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* the HVS, while the vc4_crtc.c code actually drives HVS setup for
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* each CRTC.
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*/
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#include "linux/component.h"
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#include "vc4_drv.h"
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#include "vc4_regs.h"
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#define HVS_REG(reg) { reg, #reg }
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static const struct {
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u32 reg;
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const char *name;
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} hvs_regs[] = {
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HVS_REG(SCALER_DISPCTRL),
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HVS_REG(SCALER_DISPSTAT),
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HVS_REG(SCALER_DISPID),
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HVS_REG(SCALER_DISPECTRL),
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HVS_REG(SCALER_DISPPROF),
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HVS_REG(SCALER_DISPDITHER),
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HVS_REG(SCALER_DISPEOLN),
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HVS_REG(SCALER_DISPLIST0),
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HVS_REG(SCALER_DISPLIST1),
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HVS_REG(SCALER_DISPLIST2),
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HVS_REG(SCALER_DISPLSTAT),
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HVS_REG(SCALER_DISPLACT0),
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HVS_REG(SCALER_DISPLACT1),
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HVS_REG(SCALER_DISPLACT2),
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HVS_REG(SCALER_DISPCTRL0),
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HVS_REG(SCALER_DISPBKGND0),
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HVS_REG(SCALER_DISPSTAT0),
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HVS_REG(SCALER_DISPBASE0),
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HVS_REG(SCALER_DISPCTRL1),
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HVS_REG(SCALER_DISPBKGND1),
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HVS_REG(SCALER_DISPSTAT1),
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HVS_REG(SCALER_DISPBASE1),
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HVS_REG(SCALER_DISPCTRL2),
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HVS_REG(SCALER_DISPBKGND2),
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HVS_REG(SCALER_DISPSTAT2),
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HVS_REG(SCALER_DISPBASE2),
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HVS_REG(SCALER_DISPALPHA2),
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};
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void vc4_hvs_dump_state(struct drm_device *dev)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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int i;
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for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
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DRM_INFO("0x%04x (%s): 0x%08x\n",
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hvs_regs[i].reg, hvs_regs[i].name,
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HVS_READ(hvs_regs[i].reg));
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}
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DRM_INFO("HVS ctx:\n");
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for (i = 0; i < 64; i += 4) {
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DRM_INFO("0x%08x (%s): 0x%08x 0x%08x 0x%08x 0x%08x\n",
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i * 4, i < HVS_BOOTLOADER_DLIST_END ? "B" : "D",
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2015-10-23 03:24:11 -06:00
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readl((u32 __iomem *)vc4->hvs->dlist + i + 0),
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readl((u32 __iomem *)vc4->hvs->dlist + i + 1),
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readl((u32 __iomem *)vc4->hvs->dlist + i + 2),
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readl((u32 __iomem *)vc4->hvs->dlist + i + 3));
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2015-03-02 14:01:12 -07:00
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}
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}
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#ifdef CONFIG_DEBUG_FS
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int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused)
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{
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struct drm_info_node *node = (struct drm_info_node *)m->private;
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struct drm_device *dev = node->minor->dev;
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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int i;
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for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
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seq_printf(m, "%s (0x%04x): 0x%08x\n",
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hvs_regs[i].name, hvs_regs[i].reg,
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HVS_READ(hvs_regs[i].reg));
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}
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return 0;
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}
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#endif
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static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct drm_device *drm = dev_get_drvdata(master);
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struct vc4_dev *vc4 = drm->dev_private;
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struct vc4_hvs *hvs = NULL;
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hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL);
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if (!hvs)
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return -ENOMEM;
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hvs->pdev = pdev;
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hvs->regs = vc4_ioremap_regs(pdev, 0);
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if (IS_ERR(hvs->regs))
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return PTR_ERR(hvs->regs);
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hvs->dlist = hvs->regs + SCALER_DLIST_START;
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2015-12-28 14:25:41 -07:00
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spin_lock_init(&hvs->mm_lock);
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/* Set up the HVS display list memory manager. We never
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* overwrite the setup from the bootloader (just 128b out of
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* our 16K), since we don't want to scramble the screen when
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* transitioning from the firmware's boot setup to runtime.
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*/
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drm_mm_init(&hvs->dlist_mm,
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HVS_BOOTLOADER_DLIST_END,
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(SCALER_DLIST_SIZE >> 2) - HVS_BOOTLOADER_DLIST_END);
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2015-03-02 14:01:12 -07:00
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vc4->hvs = hvs;
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return 0;
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}
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static void vc4_hvs_unbind(struct device *dev, struct device *master,
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void *data)
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{
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struct drm_device *drm = dev_get_drvdata(master);
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struct vc4_dev *vc4 = drm->dev_private;
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2015-12-28 14:25:41 -07:00
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drm_mm_takedown(&vc4->hvs->dlist_mm);
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2015-03-02 14:01:12 -07:00
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vc4->hvs = NULL;
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}
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static const struct component_ops vc4_hvs_ops = {
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.bind = vc4_hvs_bind,
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.unbind = vc4_hvs_unbind,
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};
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static int vc4_hvs_dev_probe(struct platform_device *pdev)
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{
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return component_add(&pdev->dev, &vc4_hvs_ops);
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}
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static int vc4_hvs_dev_remove(struct platform_device *pdev)
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{
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component_del(&pdev->dev, &vc4_hvs_ops);
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return 0;
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}
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static const struct of_device_id vc4_hvs_dt_match[] = {
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{ .compatible = "brcm,bcm2835-hvs" },
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{}
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};
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struct platform_driver vc4_hvs_driver = {
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.probe = vc4_hvs_dev_probe,
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.remove = vc4_hvs_dev_remove,
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.driver = {
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.name = "vc4_hvs",
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.of_match_table = vc4_hvs_dt_match,
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},
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};
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