drm/vc4: Add KMS support for Raspberry Pi.
This is enough for fbcon and bringing up X using
xf86-video-modesetting. It doesn't support the 3D accelerator or
power management yet.
v2: Drop FB_HELPER select thanks to Archit's patches. Do manual init
ordering instead of using the .load hook. Structure registration
more like tegra's, but still using the typical "component" code.
Drop no-op hooks for atomic_begin and mode_fixup() now that
they're optional. Drop sentinel in Makefile. Fix minor style
nits I noticed on another reread.
v3: Use the new bcm2835 clk driver to manage pixel/HSM clocks instead
of having a fixed video mode. Use exynos-style component driver
matching instead of devicetree nodes to list the component driver
instances. Rename compatibility strings to say bcm2835, and
distinguish pv0/1/2. Clean up some h/vsync code, and add in
interlaced mode setup. Fix up probe/bind error paths. Use
bitops.h macros for vc4_regs.h
v4: Include i2c.h, allow building under COMPILE_TEST, drop msleep now
that other bugs have been fixed, add timeouts to cpu_relax()
loops, rename hpd-gpio to hpd-gpios.
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
new file mode 100644
index 0000000..ab1673f
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -0,0 +1,163 @@
+/*
+ * 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",
+ ((uint32_t *)vc4->hvs->dlist)[i + 0],
+ ((uint32_t *)vc4->hvs->dlist)[i + 1],
+ ((uint32_t *)vc4->hvs->dlist)[i + 2],
+ ((uint32_t *)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,
+ },
+};