/*
* 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 Hardware Video Scaler (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 <drm/drm_atomic_helper.h>
#include <linux/component.h>
#include "vc4_drv.h"
#include "vc4_regs.h"
static const struct debugfs_reg32 hvs_regs[] = {
VC4_REG32(SCALER_DISPCTRL),
VC4_REG32(SCALER_DISPSTAT),
VC4_REG32(SCALER_DISPID),
VC4_REG32(SCALER_DISPECTRL),
VC4_REG32(SCALER_DISPPROF),
VC4_REG32(SCALER_DISPDITHER),
VC4_REG32(SCALER_DISPEOLN),
VC4_REG32(SCALER_DISPLIST0),
VC4_REG32(SCALER_DISPLIST1),
VC4_REG32(SCALER_DISPLIST2),
VC4_REG32(SCALER_DISPLSTAT),
VC4_REG32(SCALER_DISPLACT0),
VC4_REG32(SCALER_DISPLACT1),
VC4_REG32(SCALER_DISPLACT2),
VC4_REG32(SCALER_DISPCTRL0),
VC4_REG32(SCALER_DISPBKGND0),
VC4_REG32(SCALER_DISPSTAT0),
VC4_REG32(SCALER_DISPBASE0),
VC4_REG32(SCALER_DISPCTRL1),
VC4_REG32(SCALER_DISPBKGND1),
VC4_REG32(SCALER_DISPSTAT1),
VC4_REG32(SCALER_DISPBASE1),
VC4_REG32(SCALER_DISPCTRL2),
VC4_REG32(SCALER_DISPBKGND2),
VC4_REG32(SCALER_DISPSTAT2),
VC4_REG32(SCALER_DISPBASE2),
VC4_REG32(SCALER_DISPALPHA2),
VC4_REG32(SCALER_OLEDOFFS),
VC4_REG32(SCALER_OLEDCOEF0),
VC4_REG32(SCALER_OLEDCOEF1),
VC4_REG32(SCALER_OLEDCOEF2),
};
void vc4_hvs_dump_state(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct drm_printer p = drm_info_printer(&vc4->hvs->pdev->dev);
int i;
drm_print_regset32(&p, &vc4->hvs->regset);
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));
}
}
static int vc4_hvs_debugfs_underrun(struct seq_file *m, void *data)
{
struct drm_info_node *node = m->private;
struct drm_device *dev = node->minor->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct drm_printer p = drm_seq_file_printer(m);
drm_printf(&p, "%d\n", atomic_read(&vc4->underrun));
return 0;
}
/* The filter kernel is composed of dwords each containing 3 9-bit
* signed integers packed next to each other.
*/
#define VC4_INT_TO_COEFF(coeff) (coeff & 0x1ff)
#define VC4_PPF_FILTER_WORD(c0, c1, c2) \
((((c0) & 0x1ff) << 0) | \
(((c1) & 0x1ff) << 9) | \
(((c2) & 0x1ff) << 18))
/* The whole filter kernel is arranged as the coefficients 0-16 going
* up, then a pad, then 17-31 going down and reversed within the
* dwords. This means that a linear phase kernel (where it's
* symmetrical at the boundary between 15 and 16) has the last 5
* dwords matching the first 5, but reversed.
*/
#define VC4_LINEAR_PHASE_KERNEL(c0, c1, c2, c3, c4, c5, c6, c7, c8, \
c9, c10, c11, c12, c13, c14, c15) \
{VC4_PPF_FILTER_WORD(c0, c1, c2), \
VC4_PPF_FILTER_WORD(c3, c4, c5), \
VC4_PPF_FILTER_WORD(c6, c7, c8), \
VC4_PPF_FILTER_WORD(c9, c10, c11), \
VC4_PPF_FILTER_WORD(c12, c13, c14), \
VC4_PPF_FILTER_WORD(c15, c15, 0)}
#define VC4_LINEAR_PHASE_KERNEL_DWORDS 6
#define VC4_KERNEL_DWORDS (VC4_LINEAR_PHASE_KERNEL_DWORDS * 2 - 1)
/* Recommended B=1/3, C=1/3 filter choice from Mitchell/Netravali.
* http://www.cs.utexas.edu/~fussell/courses/cs384g/lectures/mitchell/Mitchell.pdf
*/
static const u32 mitchell_netravali_1_3_1_3_kernel[] =
VC4_LINEAR_PHASE_KERNEL(0, -2, -6, -8, -10, -8, -3, 2, 18,
50, 82, 119, 155, 187, 213, 227);
static int vc4_hvs_upload_linear_kernel(struct vc4_hvs *hvs,
struct drm_mm_node *space,
const u32 *kernel)
{
int ret, i;
u32 __iomem *dst_kernel;
ret = drm_mm_insert_node(&hvs->dlist_mm, space, VC4_KERNEL_DWORDS);
if (ret) {
DRM_ERROR("Failed to allocate space for filter kernel: %d\n",
ret);
return ret;
}
dst_kernel = hvs->dlist + space->start;
for (i = 0; i < VC4_KERNEL_DWORDS; i++) {
if (i < VC4_LINEAR_PHASE_KERNEL_DWORDS)
writel(kernel[i], &dst_kernel[i]);
else {
writel(kernel[VC4_KERNEL_DWORDS - i - 1],
&dst_kernel[i]);
}
}
return 0;
}
void vc4_hvs_mask_underrun(struct drm_device *dev, int channel)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
u32 dispctrl = HVS_READ(SCALER_DISPCTRL);
dispctrl &= ~SCALER_DISPCTRL_DSPEISLUR(channel);
HVS_WRITE(SCALER_DISPCTRL, dispctrl);
}
void vc4_hvs_unmask_underrun(struct drm_device *dev, int channel)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
u32 dispctrl = HVS_READ(SCALER_DISPCTRL);
dispctrl |= SCALER_DISPCTRL_DSPEISLUR(channel);
HVS_WRITE(SCALER_DISPSTAT,
SCALER_DISPSTAT_EUFLOW(channel));
HVS_WRITE(SCALER_DISPCTRL, dispctrl);
}
static void vc4_hvs_report_underrun(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
atomic_inc(&vc4->underrun);
DRM_DEV_ERROR(dev->dev, "HVS underrun\n");
}
static irqreturn_t vc4_hvs_irq_handler(int irq, void *data)
{
struct drm_device *dev = data;
struct vc4_dev *vc4 = to_vc4_dev(dev);
irqreturn_t irqret = IRQ_NONE;
int channel;
u32 control;
u32 status;
status = HVS_READ(SCALER_DISPSTAT);
control = HVS_READ(SCALER_DISPCTRL);
for (channel = 0; channel < SCALER_CHANNELS_COUNT; channel++) {
/* Interrupt masking is not always honored, so check it here. */
if (status & SCALER_DISPSTAT_EUFLOW(channel) &&
control & SCALER_DISPCTRL_DSPEISLUR(channel)) {
vc4_hvs_mask_underrun(dev, channel);
vc4_hvs_report_underrun(dev);
irqret = IRQ_HANDLED;
}
}
/* Clear every per-channel interrupt flag. */
HVS_WRITE(SCALER_DISPSTAT, SCALER_DISPSTAT_IRQMASK(0) |
SCALER_DISPSTAT_IRQMASK(1) |
SCALER_DISPSTAT_IRQMASK(2));
return irqret;
}
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;
int ret;
u32 dispctrl;
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->regset.base = hvs->regs;
hvs->regset.regs = hvs_regs;
hvs->regset.nregs = ARRAY_SIZE(hvs_regs);
hvs->dlist = hvs->regs + SCALER_DLIST_START;
spin_lock_init(&hvs->mm_lock);
/* Set up the HVS display list memory manager. We never
* overwrite the setup from the bootloader (just 128b out of
* our 16K), since we don't want to scramble the screen when
* transitioning from the firmware's boot setup to runtime.
*/
drm_mm_init(&hvs->dlist_mm,
HVS_BOOTLOADER_DLIST_END,
(SCALER_DLIST_SIZE >> 2) - HVS_BOOTLOADER_DLIST_END);
/* Set up the HVS LBM memory manager. We could have some more
* complicated data structure that allowed reuse of LBM areas
* between planes when they don't overlap on the screen, but
* for now we just allocate globally.
*/
drm_mm_init(&hvs->lbm_mm, 0, 96 * 1024);
/* Upload filter kernels. We only have the one for now, so we
* keep it around for the lifetime of the driver.
*/
ret = vc4_hvs_upload_linear_kernel(hvs,
&hvs->mitchell_netravali_filter,
mitchell_netravali_1_3_1_3_kernel);
if (ret)
return ret;
vc4->hvs = hvs;
dispctrl = HVS_READ(SCALER_DISPCTRL);
dispctrl |= SCALER_DISPCTRL_ENABLE;
dispctrl |= SCALER_DISPCTRL_DISPEIRQ(0) |
SCALER_DISPCTRL_DISPEIRQ(1) |
SCALER_DISPCTRL_DISPEIRQ(2);
/* Set DSP3 (PV1) to use HVS channel 2, which would otherwise
* be unused.
*/
dispctrl &= ~SCALER_DISPCTRL_DSP3_MUX_MASK;
dispctrl &= ~(SCALER_DISPCTRL_DMAEIRQ |
SCALER_DISPCTRL_SLVWREIRQ |
SCALER_DISPCTRL_SLVRDEIRQ |
SCALER_DISPCTRL_DSPEIEOF(0) |
SCALER_DISPCTRL_DSPEIEOF(1) |
SCALER_DISPCTRL_DSPEIEOF(2) |
SCALER_DISPCTRL_DSPEIEOLN(0) |
SCALER_DISPCTRL_DSPEIEOLN(1) |
SCALER_DISPCTRL_DSPEIEOLN(2) |
SCALER_DISPCTRL_DSPEISLUR(0) |
SCALER_DISPCTRL_DSPEISLUR(1) |
SCALER_DISPCTRL_DSPEISLUR(2) |
SCALER_DISPCTRL_SCLEIRQ);
dispctrl |= VC4_SET_FIELD(2, SCALER_DISPCTRL_DSP3_MUX);
HVS_WRITE(SCALER_DISPCTRL, dispctrl);
ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
vc4_hvs_irq_handler, 0, "vc4 hvs", drm);
if (ret)
return ret;
vc4_debugfs_add_regset32(drm, "hvs_regs", &hvs->regset);
vc4_debugfs_add_file(drm, "hvs_underrun", vc4_hvs_debugfs_underrun,
NULL);
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;
if (vc4->hvs->mitchell_netravali_filter.allocated)
drm_mm_remove_node(&vc4->hvs->mitchell_netravali_filter);
drm_mm_takedown(&vc4->hvs->dlist_mm);
drm_mm_takedown(&vc4->hvs->lbm_mm);
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,
},
};
