rockchip: video: refactor rk_vop and split RK3288-specific code off

To prepare for adding the RK3399 VOP driver (which shares most of its
registers and config logic with the RK3228 VOP), this change refactors
the driver and splits the RK3288-specific driver off.

The changes in detail are:
- introduces a data-structure for chip-specific drivers to register
  features/callbacks with the common driver: at this time, this is
  limited to a callback for setting the pin polarities (between the
  VOP and the encoder modules) and a flag to signal 10bit RGB
  capability
- refactors the probing of regulators into a helper function that
  can take a list of regulator names to probe and autoset
- moves the priv data-structure into a (common) header file to be
  used by the chip-specific drivers to provide base addresses to
  the common driver
- uses a callback into the chip-specific driver to set pin polarities
  (replacing the direct register accesses previously used)
- splits enabling the output (towards an encoder) into a separate
  help function withint the common driver

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

4 files changed, 216 insertions, 94 deletions

diff --git a/drivers/video/rockchip/Makefile b/drivers/video/rockchip/Makefile
index cd54b12..9477ad0 100644
--- a/drivers/video/rockchip/Makefile
+++ b/drivers/video/rockchip/Makefile
@@ -7,6 +7,7 @@
 
 ifdef CONFIG_VIDEO_ROCKCHIP
 obj-y += rk_vop.o
+obj-$(CONFIG_ROCKCHIP_RK3288) += rk3288_vop.o
 obj-$(CONFIG_DISPLAY_ROCKCHIP_EDP) += rk_edp.o
 obj-$(CONFIG_DISPLAY_ROCKCHIP_LVDS) += rk_lvds.o
 obj-$(CONFIG_DISPLAY_ROCKCHIP_HDMI) += rk_hdmi.o
diff --git a/drivers/video/rockchip/rk3288_vop.c b/drivers/video/rockchip/rk3288_vop.c
new file mode 100644
index 0000000..e3e1ec7
--- /dev/null
+++ b/drivers/video/rockchip/rk3288_vop.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2017 Theobroma Systems Design und Consulting GmbH
+ * Copyright (c) 2015 Google, Inc
+ * Copyright 2014 Rockchip Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <display.h>
+#include <dm.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <video.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/grf_rk3288.h>
+#include "rk_vop.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void rk3288_set_pin_polarity(struct udevice *dev,
+				    enum vop_modes mode, u32 polarity)
+{
+	struct rk_vop_priv *priv = dev_get_priv(dev);
+	struct rk3288_vop *regs = priv->regs;
+
+	/* The RK3328 VOP (v3.1) has its polarity configuration in ctrl0 */
+	clrsetbits_le32(&regs->dsp_ctrl0,
+			M_DSP_DCLK_POL | M_DSP_DEN_POL |
+			M_DSP_VSYNC_POL | M_DSP_HSYNC_POL,
+			V_DSP_PIN_POL(polarity));
+}
+
+static void rk3288_set_io_vsel(struct udevice *dev)
+{
+	struct rk3288_grf *grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+
+	/* lcdc(vop) iodomain select 1.8V */
+	rk_setreg(&grf->io_vsel, 1 << 0);
+}
+
+/*
+ * Try some common regulators. We should really get these from the
+ * device tree somehow.
+ */
+static const char * const rk3288_regulator_names[] = {
+	"vcc18_lcd",
+	"VCC18_LCD",
+	"vdd10_lcd_pwren_h",
+	"vdd10_lcd",
+	"VDD10_LCD",
+	"vcc33_lcd"
+};
+
+static int rk3288_vop_probe(struct udevice *dev)
+{
+	/* Before relocation we don't need to do anything */
+	if (!(gd->flags & GD_FLG_RELOC))
+		return 0;
+
+	/* Set the LCDC(vop) iodomain to 1.8V */
+	rk3288_set_io_vsel(dev);
+
+	/* Probe regulators required for the RK3288 VOP */
+	rk_vop_probe_regulators(dev, rk3288_regulator_names,
+				ARRAY_SIZE(rk3288_regulator_names));
+
+	return rk_vop_probe(dev);
+}
+
+struct rkvop_driverdata rk3288_driverdata = {
+	.features = VOP_FEATURE_OUTPUT_10BIT,
+	.set_pin_polarity = rk3288_set_pin_polarity,
+};
+
+static const struct udevice_id rk3288_vop_ids[] = {
+	{ .compatible = "rockchip,rk3288-vop",
+	  .data = (ulong)&rk3288_driverdata },
+	{ }
+};
+
+static const struct video_ops rk3288_vop_ops = {
+};
+
+U_BOOT_DRIVER(rk_vop) = {
+	.name	= "rk3288_vop",
+	.id	= UCLASS_VIDEO,
+	.of_match = rk3288_vop_ids,
+	.ops	= &rk3288_vop_ops,
+	.bind	= rk_vop_bind,
+	.probe	= rk3288_vop_probe,
+	.priv_auto_alloc_size	= sizeof(struct rk_vop_priv),
+};
diff --git a/drivers/video/rockchip/rk_vop.c b/drivers/video/rockchip/rk_vop.c
index c612b55..9343796 100644
--- a/drivers/video/rockchip/rk_vop.c
+++ b/drivers/video/rockchip/rk_vop.c
@@ -17,24 +17,25 @@
 #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/vop_rk3288.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
-#include <dt-bindings/clock/rk3288-cru.h>
 #include <power/regulator.h>
+#include "rk_vop.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
-struct rk_vop_priv {
-	struct rk3288_vop *regs;
-	struct rk3288_grf *grf;
+enum vop_pol {
+	HSYNC_POSITIVE = 0,
+	VSYNC_POSITIVE = 1,
+	DEN_NEGATIVE   = 2,
+	DCLK_INVERT    = 3
 };
 
-void rkvop_enable(struct rk3288_vop *regs, ulong fbbase,
-		  int fb_bits_per_pixel, const struct display_timing *edid)
+static 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;
@@ -89,54 +90,83 @@ void rkvop_enable(struct rk3288_vop *regs, ulong fbbase,
 	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)
+static void rkvop_set_pin_polarity(struct udevice *dev,
+				   enum vop_modes mode, u32 polarity)
 {
-	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;
-	int mode_flags;
+	struct rkvop_driverdata *ops =
+		(struct rkvop_driverdata *)dev_get_driver_data(dev);
+
+	if (ops->set_pin_polarity)
+		ops->set_pin_polarity(dev, mode, polarity);
+}
+
+static void rkvop_enable_output(struct udevice *dev, enum vop_modes mode)
+{
+	struct rk_vop_priv *priv = dev_get_priv(dev);
+	struct rk3288_vop *regs = priv->regs;
 
 	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;
+
 	case VOP_MODE_LVDS:
 		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
 				V_RGB_OUT_EN(1));
 		break;
+
 	case VOP_MODE_MIPI:
 		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
 				V_MIPI_OUT_EN(1));
-		 break;
+		break;
+
+	default:
+		debug("%s: unsupported output mode %x\n", __func__, mode);
 	}
+}
 
-	if (mode == VOP_MODE_HDMI || mode == VOP_MODE_EDP)
-		/* RGBaaa */
-		mode_flags = 15;
-	else
-		/* RGB888 */
-		mode_flags = 0;
+static void rkvop_mode_set(struct udevice *dev,
+			   const struct display_timing *edid,
+			   enum vop_modes mode)
+{
+	struct rk_vop_priv *priv = dev_get_priv(dev);
+	struct rk3288_vop *regs = priv->regs;
+	struct rkvop_driverdata *data =
+		(struct rkvop_driverdata *)dev_get_driver_data(dev);
 
-	flags = V_DSP_OUT_MODE(mode_flags) |
-		V_DSP_HSYNC_POL(!!(edid->flags & DISPLAY_FLAGS_HSYNC_HIGH)) |
-		V_DSP_VSYNC_POL(!!(edid->flags & DISPLAY_FLAGS_VSYNC_HIGH));
+	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;
+	int mode_flags;
+	u32 pin_polarity;
+
+	pin_polarity = BIT(DCLK_INVERT);
+	if (edid->flags & DISPLAY_FLAGS_HSYNC_HIGH)
+		pin_polarity |= BIT(HSYNC_POSITIVE);
+	if (edid->flags & DISPLAY_FLAGS_VSYNC_HIGH)
+		pin_polarity |= BIT(VSYNC_POSITIVE);
+
+	rkvop_set_pin_polarity(dev, mode, pin_polarity);
+	rkvop_enable_output(dev, mode);
 
-	clrsetbits_le32(&regs->dsp_ctrl0,
-			M_DSP_OUT_MODE | M_DSP_VSYNC_POL | M_DSP_HSYNC_POL,
-			flags);
+	mode_flags = 0;  /* RGB888 */
+	if ((data->features & VOP_FEATURE_OUTPUT_10BIT) &&
+	    (mode == VOP_MODE_HDMI || mode == VOP_MODE_EDP))
+		mode_flags = 15;  /* RGBaaa */
+
+	clrsetbits_le32(&regs->dsp_ctrl0, M_DSP_OUT_MODE,
+			V_DSP_OUT_MODE(mode_flags));
 
 	writel(V_HSYNC(hsync_len) |
 	       V_HORPRD(hsync_len + hback_porch + hactive + hfront_porch),
@@ -185,7 +215,7 @@ void rkvop_mode_set(struct rk3288_vop *regs,
  *		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, int ep_node)
+static int rk_display_init(struct udevice *dev, ulong fbbase, int ep_node)
 {
 	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
 	const void *blob = gd->fdt_blob;
@@ -255,18 +285,18 @@ int rk_display_init(struct udevice *dev, ulong fbbase, int ep_node)
 	/* Set bitwidth for vop display according to vop mode */
 	switch (vop_id) {
 	case VOP_MODE_EDP:
-	case VOP_MODE_HDMI:
 	case VOP_MODE_LVDS:
 		l2bpp = VIDEO_BPP16;
 		break;
+	case VOP_MODE_HDMI:
 	case VOP_MODE_MIPI:
 		l2bpp = VIDEO_BPP32;
 		break;
 	default:
 		l2bpp = VIDEO_BPP16;
 	}
-	rkvop_mode_set(regs, &timing, vop_id);
 
+	rkvop_mode_set(dev, &timing, vop_id);
 	rkvop_enable(regs, fbbase, 1 << l2bpp, &timing);
 
 	ret = display_enable(disp, 1 << l2bpp, &timing);
@@ -281,53 +311,37 @@ int rk_display_init(struct udevice *dev, ulong fbbase, int ep_node)
 	return 0;
 }
 
-static int rk_vop_probe(struct udevice *dev)
+void rk_vop_probe_regulators(struct udevice *dev,
+			     const char * const *names, int cnt)
+{
+	int i, ret;
+	const char *name;
+	struct udevice *reg;
+
+	for (i = 0; i < cnt; ++i) {
+		name = names[i];
+		debug("%s: probing regulator '%s'\n", dev->name, name);
+
+		ret = regulator_autoset_by_name(name, &reg);
+		if (!ret)
+			ret = regulator_set_enable(reg, true);
+	}
+}
+
+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;
+	int ret = 0;
+	int 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 *)devfdt_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.
@@ -353,7 +367,7 @@ static int rk_vop_probe(struct udevice *dev)
 	return ret;
 }
 
-static int rk_vop_bind(struct udevice *dev)
+int rk_vop_bind(struct udevice *dev)
 {
 	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
 
@@ -362,23 +376,3 @@ static int rk_vop_bind(struct udevice *dev)
 
 	return 0;
 }
-
-static const struct video_ops rk_vop_ops = {
-};
-
-static const struct udevice_id rk_vop_ids[] = {
-	{ .compatible = "rockchip,rk3399-vop-big" },
-	{ .compatible = "rockchip,rk3399-vop-lit" },
-	{ .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),
-};
diff --git a/drivers/video/rockchip/rk_vop.h b/drivers/video/rockchip/rk_vop.h
new file mode 100644
index 0000000..f65ac17
--- /dev/null
+++ b/drivers/video/rockchip/rk_vop.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __RK_VOP_H__
+#define __RK_VOP_H__
+
+#include <asm/arch/vop_rk3288.h>
+
+struct rk_vop_priv {
+	void *regs;
+};
+
+enum vop_features {
+	VOP_FEATURE_OUTPUT_10BIT = (1 << 0),
+};
+
+struct rkvop_driverdata {
+	/* configuration */
+	u32 features;
+	/* block-specific setters/getters */
+	void (*set_pin_polarity)(struct udevice *, enum vop_modes, u32);
+};
+
+int rk_vop_probe(struct udevice *dev);
+int rk_vop_bind(struct udevice *dev);
+void rk_vop_probe_regulators(struct udevice *dev,
+			     const char * const *names, int cnt);
+
+#endif