ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/gpu/drm/vc4/vc4_hvs.c b/marvell/linux/drivers/gpu/drm/vc4/vc4_hvs.c
new file mode 100644
index 0000000..9936b15
--- /dev/null
+++ b/marvell/linux/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -0,0 +1,355 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 Broadcom
+ */
+
+/**
+ * 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 <linux/component.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_atomic_helper.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,
+ },
+};