rockchip: video: Add a video-output driver

Some rockchip SoCs include video output (VOP). Add a driver to support this.
It can output via a display driver (UCLASS_DISPLAY) and currently HDMI and
eDP are supported.

Signed-off-by: Simon Glass <sjg@chromium.org>

2 files changed, 347 insertions, 1 deletions

diff --git a/drivers/video/rockchip/Makefile b/drivers/video/rockchip/Makefile
index 5566719..0e9a8ac 100644
--- a/drivers/video/rockchip/Makefile
+++ b/drivers/video/rockchip/Makefile
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += rk_edp.o rk_hdmi.o
+obj-y += rk_edp.o rk_hdmi.o rk_vop.o
diff --git a/drivers/video/rockchip/rk_vop.c b/drivers/video/rockchip/rk_vop.c
new file mode 100644
index 0000000..adbc68f
--- /dev/null
+++ b/drivers/video/rockchip/rk_vop.c
@@ -0,0 +1,346 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Copyright 2014 Rockchip Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <display.h>
+#include <dm.h>
+#include <edid.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <video.h>
+#include <asm/gpio.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3288.h>
+#include <asm/arch/grf_rk3288.h>
+#include <asm/arch/edp_rk3288.h>
+#include <asm/arch/hdmi_rk3288.h>
+#include <asm/arch/vop_rk3288.h>
+#include <dm/device-internal.h>
+#include <dm/uclass-internal.h>
+#include <dt-bindings/clock/rk3288-cru.h>
+#include <power/regulator.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct rk_vop_priv {
+	struct rk3288_vop *regs;
+	struct rk3288_grf *grf;
+};
+
+void rkvop_enable(struct rk3288_vop *regs, ulong fbbase,
+		  int fb_bits_per_pixel, const struct display_timing *edid)
+{
+	u32 lb_mode;
+	u32 rgb_mode;
+	u32 hactive = edid->hactive.typ;
+	u32 vactive = edid->vactive.typ;
+
+	writel(V_ACT_WIDTH(hactive - 1) | V_ACT_HEIGHT(vactive - 1),
+	       &regs->win0_act_info);
+
+	writel(V_DSP_XST(edid->hsync_len.typ + edid->hback_porch.typ) |
+	       V_DSP_YST(edid->vsync_len.typ + edid->vback_porch.typ),
+	       &regs->win0_dsp_st);
+
+	writel(V_DSP_WIDTH(hactive - 1) |
+		V_DSP_HEIGHT(vactive - 1),
+		&regs->win0_dsp_info);
+
+	clrsetbits_le32(&regs->win0_color_key, M_WIN0_KEY_EN | M_WIN0_KEY_COLOR,
+			V_WIN0_KEY_EN(0) | V_WIN0_KEY_COLOR(0));
+
+	switch (fb_bits_per_pixel) {
+	case 16:
+		rgb_mode = RGB565;
+		writel(V_RGB565_VIRWIDTH(hactive), &regs->win0_vir);
+		break;
+	case 24:
+		rgb_mode = RGB888;
+		writel(V_RGB888_VIRWIDTH(hactive), &regs->win0_vir);
+		break;
+	case 32:
+	default:
+		rgb_mode = ARGB8888;
+		writel(V_ARGB888_VIRWIDTH(hactive), &regs->win0_vir);
+		break;
+	}
+
+	if (hactive > 2560)
+		lb_mode = LB_RGB_3840X2;
+	else if (hactive > 1920)
+		lb_mode = LB_RGB_2560X4;
+	else if (hactive > 1280)
+		lb_mode = LB_RGB_1920X5;
+	else
+		lb_mode = LB_RGB_1280X8;
+
+	clrsetbits_le32(&regs->win0_ctrl0,
+			M_WIN0_LB_MODE | M_WIN0_DATA_FMT | M_WIN0_EN,
+			V_WIN0_LB_MODE(lb_mode) | V_WIN0_DATA_FMT(rgb_mode) |
+			V_WIN0_EN(1));
+
+	writel(fbbase, &regs->win0_yrgb_mst);
+	writel(0x01, &regs->reg_cfg_done); /* enable reg config */
+}
+
+void rkvop_mode_set(struct rk3288_vop *regs,
+		    const struct display_timing *edid, enum vop_modes mode)
+{
+	u32 hactive = edid->hactive.typ;
+	u32 vactive = edid->vactive.typ;
+	u32 hsync_len = edid->hsync_len.typ;
+	u32 hback_porch = edid->hback_porch.typ;
+	u32 vsync_len = edid->vsync_len.typ;
+	u32 vback_porch = edid->vback_porch.typ;
+	u32 hfront_porch = edid->hfront_porch.typ;
+	u32 vfront_porch = edid->vfront_porch.typ;
+	uint flags;
+
+	switch (mode) {
+	case VOP_MODE_HDMI:
+		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
+				V_HDMI_OUT_EN(1));
+		break;
+	case VOP_MODE_EDP:
+	default:
+		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
+				V_EDP_OUT_EN(1));
+		break;
+	}
+
+	flags = V_DSP_OUT_MODE(15) |
+		V_DSP_HSYNC_POL(!!(edid->flags & DISPLAY_FLAGS_HSYNC_HIGH)) |
+		V_DSP_VSYNC_POL(!!(edid->flags & DISPLAY_FLAGS_VSYNC_HIGH));
+
+	clrsetbits_le32(&regs->dsp_ctrl0,
+			M_DSP_OUT_MODE | M_DSP_VSYNC_POL | M_DSP_HSYNC_POL,
+			flags);
+
+	writel(V_HSYNC(hsync_len) |
+	       V_HORPRD(hsync_len + hback_porch + hactive + hfront_porch),
+			&regs->dsp_htotal_hs_end);
+
+	writel(V_HEAP(hsync_len + hback_porch + hactive) |
+	       V_HASP(hsync_len + hback_porch),
+	       &regs->dsp_hact_st_end);
+
+	writel(V_VSYNC(vsync_len) |
+	       V_VERPRD(vsync_len + vback_porch + vactive + vfront_porch),
+	       &regs->dsp_vtotal_vs_end);
+
+	writel(V_VAEP(vsync_len + vback_porch + vactive)|
+	       V_VASP(vsync_len + vback_porch),
+	       &regs->dsp_vact_st_end);
+
+	writel(V_HEAP(hsync_len + hback_porch + hactive) |
+	       V_HASP(hsync_len + hback_porch),
+	       &regs->post_dsp_hact_info);
+
+	writel(V_VAEP(vsync_len + vback_porch + vactive)|
+	       V_VASP(vsync_len + vback_porch),
+	       &regs->post_dsp_vact_info);
+
+	writel(0x01, &regs->reg_cfg_done); /* enable reg config */
+}
+
+/**
+ * rk_display_init() - Try to enable the given display device
+ *
+ * This function performs many steps:
+ * - Finds the display device being referenced by @ep_node
+ * - Puts the VOP's ID into its uclass platform data
+ * - Probes the device to set it up
+ * - Reads the EDID timing information
+ * - Sets up the VOP clocks, etc. for the selected pixel clock and display mode
+ * - Enables the display (the display device handles this and will do different
+ *     things depending on the display type)
+ * - Tells the uclass about the display resolution so that the console will
+ *     appear correctly
+ *
+ * @dev:	VOP device that we want to connect to the display
+ * @fbbase:	Frame buffer address
+ * @l2bpp	Log2 of bits-per-pixels for the display
+ * @ep_node:	Device tree node to process - this is the offset of an endpoint
+ *		node within the VOP's 'port' list.
+ * @return 0 if OK, -ve if something went wrong
+ */
+int rk_display_init(struct udevice *dev, ulong fbbase,
+		    enum video_log2_bpp l2bpp, int ep_node)
+{
+	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+	const void *blob = gd->fdt_blob;
+	struct rk_vop_priv *priv = dev_get_priv(dev);
+	int vop_id, remote_vop_id;
+	struct rk3288_vop *regs = priv->regs;
+	struct display_timing timing;
+	struct udevice *disp;
+	int ret, remote, i, offset;
+	struct display_plat *disp_uc_plat;
+	struct udevice *clk;
+
+	vop_id = fdtdec_get_int(blob, ep_node, "reg", -1);
+	debug("vop_id=%d\n", vop_id);
+	remote = fdtdec_lookup_phandle(blob, ep_node, "remote-endpoint");
+	if (remote < 0)
+		return -EINVAL;
+	remote_vop_id = fdtdec_get_int(blob, remote, "reg", -1);
+	debug("remote vop_id=%d\n", remote_vop_id);
+
+	for (i = 0, offset = remote; i < 3 && offset > 0; i++)
+		offset = fdt_parent_offset(blob, offset);
+	if (offset < 0) {
+		debug("%s: Invalid remote-endpoint position\n", dev->name);
+		return -EINVAL;
+	}
+
+	ret = uclass_find_device_by_of_offset(UCLASS_DISPLAY, offset, &disp);
+	if (ret) {
+		debug("%s: device '%s' display not found (ret=%d)\n", __func__,
+		      dev->name, ret);
+		return ret;
+	}
+
+	disp_uc_plat = dev_get_uclass_platdata(disp);
+	debug("Found device '%s', disp_uc_priv=%p\n", disp->name, disp_uc_plat);
+	disp_uc_plat->source_id = remote_vop_id;
+	disp_uc_plat->src_dev = dev;
+
+	ret = device_probe(disp);
+	if (ret) {
+		debug("%s: device '%s' display won't probe (ret=%d)\n",
+		      __func__, dev->name, ret);
+		return ret;
+	}
+
+	ret = display_read_timing(disp, &timing);
+	if (ret) {
+		debug("%s: Failed to read timings\n", __func__);
+		return ret;
+	}
+
+	ret = rkclk_get_clk(CLK_NEW, &clk);
+	if (!ret) {
+		ret = clk_set_periph_rate(clk, DCLK_VOP0 + vop_id,
+					  timing.pixelclock.typ);
+	}
+	if (ret) {
+		debug("%s: Failed to set pixel clock: ret=%d\n", __func__, ret);
+		return ret;
+	}
+
+	rkvop_mode_set(regs, &timing, vop_id);
+
+	rkvop_enable(regs, fbbase, 1 << l2bpp, &timing);
+
+	ret = display_enable(disp, 1 << l2bpp, &timing);
+	if (ret)
+		return ret;
+
+	uc_priv->xsize = timing.hactive.typ;
+	uc_priv->ysize = timing.vactive.typ;
+	uc_priv->bpix = l2bpp;
+	debug("fb=%lx, size=%d %d\n", fbbase, uc_priv->xsize, uc_priv->ysize);
+
+	return 0;
+}
+
+static int rk_vop_probe(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	const void *blob = gd->fdt_blob;
+	struct rk_vop_priv *priv = dev_get_priv(dev);
+	struct udevice *reg;
+	int ret, port, node;
+
+	/* Before relocation we don't need to do anything */
+	if (!(gd->flags & GD_FLG_RELOC))
+		return 0;
+
+	priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	priv->regs = (struct rk3288_vop *)dev_get_addr(dev);
+
+	/* lcdc(vop) iodomain select 1.8V */
+	rk_setreg(&priv->grf->io_vsel, 1 << 0);
+
+	/*
+	 * Try some common regulators. We should really get these from the
+	 * device tree somehow.
+	 */
+	ret = regulator_autoset_by_name("vcc18_lcd", &reg);
+	if (ret)
+		debug("%s: Cannot autoset regulator vcc18_lcd\n", __func__);
+	ret = regulator_autoset_by_name("VCC18_LCD", &reg);
+	if (ret)
+		debug("%s: Cannot autoset regulator VCC18_LCD\n", __func__);
+	ret = regulator_autoset_by_name("vdd10_lcd_pwren_h", &reg);
+	if (ret) {
+		debug("%s: Cannot autoset regulator vdd10_lcd_pwren_h\n",
+		      __func__);
+	}
+	ret = regulator_autoset_by_name("vdd10_lcd", &reg);
+	if (ret) {
+		debug("%s: Cannot autoset regulator vdd10_lcd\n",
+		      __func__);
+	}
+	ret = regulator_autoset_by_name("VDD10_LCD", &reg);
+	if (ret) {
+		debug("%s: Cannot autoset regulator VDD10_LCD\n",
+		      __func__);
+	}
+	ret = regulator_autoset_by_name("vcc33_lcd", &reg);
+	if (ret)
+		debug("%s: Cannot autoset regulator vcc33_lcd\n", __func__);
+
+	/*
+	 * Try all the ports until we find one that works. In practice this
+	 * tries EDP first if available, then HDMI.
+	 */
+	port = fdt_subnode_offset(blob, dev->of_offset, "port");
+	if (port < 0)
+		return -EINVAL;
+	for (node = fdt_first_subnode(blob, port);
+	     node > 0;
+	     node = fdt_next_subnode(blob, node)) {
+		ret = rk_display_init(dev, plat->base, VIDEO_BPP16, node);
+		if (ret)
+			debug("Device failed: ret=%d\n", ret);
+		if (!ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int rk_vop_bind(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+
+	plat->size = 1920 * 1080 * 2;
+
+	return 0;
+}
+
+static const struct video_ops rk_vop_ops = {
+};
+
+static const struct udevice_id rk_vop_ids[] = {
+	{ .compatible = "rockchip,rk3288-vop" },
+	{ }
+};
+
+U_BOOT_DRIVER(rk_vop) = {
+	.name	= "rk_vop",
+	.id	= UCLASS_VIDEO,
+	.of_match = rk_vop_ids,
+	.ops	= &rk_vop_ops,
+	.bind	= rk_vop_bind,
+	.probe	= rk_vop_probe,
+	.priv_auto_alloc_size	= sizeof(struct rk_vop_priv),
+};