drivers/video/ihs_video_out.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2017
  * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
  *
  * based on the gdsys osd driver, which is
  *
  * (C) Copyright 2010
  * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.de
  */

 #include <common.h>
 #include <display.h>
 #include <dm.h>
 #include <regmap.h>
 #include <video_osd.h>
 #include <asm/gpio.h>

 static const uint MAX_X_CHARS = 53;
 static const uint MAX_Y_CHARS = 26;
 static const uint MAX_VIDEOMEM_WIDTH = 64;
 static const uint MAX_VIDEOMEM_HEIGHT = 32;
 static const uint CHAR_WIDTH = 12;
 static const uint CHAR_HEIGHT = 18;

 static const u16 BASE_WIDTH_MASK = 0x3f00;
 static const uint BASE_WIDTH_SHIFT = 8;
 static const u16 BASE_HEIGTH_MASK = 0x001f;
 static const uint BASE_HEIGTH_SHIFT;

 struct ihs_video_out_regs {
 	/* Device version register */
 	u16 versions;
 	/* Device feature register */
 	u16 features;
 	/* Device control register */
 	u16 control;
 	/* Register controlling screen size */
 	u16 xy_size;
 	/* Register controlling screen scaling */
 	u16 xy_scale;
 	/* Register controlling screen x position */
 	u16 x_pos;
 	/* Register controlling screen y position */
 	u16 y_pos;
 };

 #define ihs_video_out_set(map, member, val) \
 	regmap_range_set(map, 1, struct ihs_video_out_regs, member, val)

 #define ihs_video_out_get(map, member, valp) \
 	regmap_range_get(map, 1, struct ihs_video_out_regs, member, valp)

 enum {
 	CONTROL_FILTER_BLACK = (0 << 0),
 	CONTROL_FILTER_ORIGINAL = (1 << 0),
 	CONTROL_FILTER_DARKER = (2 << 0),
 	CONTROL_FILTER_GRAY = (3 << 0),

 	CONTROL_MODE_PASSTHROUGH = (0 << 3),
 	CONTROL_MODE_OSD = (1 << 3),
 	CONTROL_MODE_AUTO = (2 << 3),
 	CONTROL_MODE_OFF = (3 << 3),

 	CONTROL_ENABLE_OFF = (0 << 6),
 	CONTROL_ENABLE_ON = (1 << 6),
 };

 struct ihs_video_out_priv {
 	/* Register map for OSD device */
 	struct regmap *map;
 	/* Pointer to video memory */
 	u16 *vidmem;
 	/* Display width in text columns */
 	uint base_width;
 	/* Display height in text rows */
 	uint base_height;
 	/* x-resolution of the display in pixels */
 	uint res_x;
 	/* y-resolution of the display in pixels */
 	uint res_y;
 	/* OSD's sync mode (resolution + frequency) */
 	int sync_src;
 	/* The display port output for this OSD */
 	struct udevice *video_tx;
 	/* The pixel clock generator for the display */
 	struct udevice *clk_gen;
 };

 static const struct udevice_id ihs_video_out_ids[] = {
 	{ .compatible = "gdsys,ihs_video_out" },
 	{ }
 };

 /**
  * set_control() - Set the control register to a given value
  *
  * The current value of sync_src is preserved by the function automatically.
  *
  * @dev: the OSD device whose control register to set
  * @value: the 16-bit value to write to the control register
  * Return: 0
  */
 static int set_control(struct udevice *dev, u16 value)
 {
 	struct ihs_video_out_priv *priv = dev_get_priv(dev);

 	if (priv->sync_src)
 		value |= ((priv->sync_src & 0x7) << 8);

 	ihs_video_out_set(priv->map, control, value);

 	return 0;
 }

 int ihs_video_out_get_info(struct udevice *dev, struct video_osd_info *info)
 {
 	struct ihs_video_out_priv *priv = dev_get_priv(dev);
 	u16 versions;

 	ihs_video_out_get(priv->map, versions, &versions);

 	info->width = priv->base_width;
 	info->height = priv->base_height;
 	info->major_version = versions / 100;
 	info->minor_version = versions % 100;

 	return 0;
 }

 int ihs_video_out_set_mem(struct udevice *dev, uint col, uint row, u8 *buf,
 			  size_t buflen, uint count)
 {
 	struct ihs_video_out_priv *priv = dev_get_priv(dev);
 	int res;
 	uint offset;
 	uint k, rep;
 	u16 data;

 	/* Repetitions (controlled via count parmeter) */
 	for (rep = 0; rep < count; ++rep) {
 		offset = row * priv->base_width + col + rep * (buflen / 2);

 		/* Write a single buffer copy */
 		for (k = 0; k < buflen / 2; ++k) {
 			uint max_size = priv->base_width * priv->base_height;

 			if (offset + k >= max_size) {
 				debug("%s: Write would be out of OSD bounds\n",
 				      dev->name);
 				return -E2BIG;
 			}

 			data = buf[2 * k + 1] + 256 * buf[2 * k];
 			out_le16(priv->vidmem + offset + k, data);
 		}
 	}

 	res = set_control(dev, CONTROL_FILTER_ORIGINAL |
 			       CONTROL_MODE_OSD |
 			       CONTROL_ENABLE_ON);
 	if (res) {
 		debug("%s: Could not set control register\n", dev->name);
 		return res;
 	}

 	return 0;
 }

 /**
  * div2_u16() - Approximately divide a 16-bit number by 2
  *
  * @val: The 16-bit value to divide by two
  * Return: The approximate division of val by two
  */
 static inline u16 div2_u16(u16 val)
 {
 	return (32767 * val) / 65535;
 }

 int ihs_video_out_set_size(struct udevice *dev, uint col, uint row)
 {
 	struct ihs_video_out_priv *priv = dev_get_priv(dev);

 	if (!col || col > MAX_VIDEOMEM_WIDTH || col > MAX_X_CHARS ||
 	    !row || row > MAX_VIDEOMEM_HEIGHT || row > MAX_Y_CHARS) {
 		debug("%s: Desired OSD size invalid\n", dev->name);
 		return -EINVAL;
 	}

 	ihs_video_out_set(priv->map, xy_size, ((col - 1) << 8) | (row - 1));
 	/* Center OSD on screen */
 	ihs_video_out_set(priv->map, x_pos,
 			  div2_u16(priv->res_x - CHAR_WIDTH * col));
 	ihs_video_out_set(priv->map, y_pos,
 			  div2_u16(priv->res_y - CHAR_HEIGHT * row));

 	return 0;
 }

 int ihs_video_out_print(struct udevice *dev, uint col, uint row, ulong color,
 			char *text)
 {
 	int res;
 	u8 buffer[2 * MAX_VIDEOMEM_WIDTH];
 	uint k;
 	uint charcount = strlen(text);
 	uint len = min(charcount, 2 * MAX_VIDEOMEM_WIDTH);

 	for (k = 0; k < len; ++k) {
 		buffer[2 * k] = text[k];
 		buffer[2 * k + 1] = color;
 	}

 	res = ihs_video_out_set_mem(dev, col, row, buffer, 2 * len, 1);
 	if (res < 0) {
 		debug("%s: Could not write to video memory\n", dev->name);
 		return res;
 	}

 	return 0;
 }

 static const struct video_osd_ops ihs_video_out_ops = {
 	.get_info = ihs_video_out_get_info,
 	.set_mem = ihs_video_out_set_mem,
 	.set_size = ihs_video_out_set_size,
 	.print = ihs_video_out_print,
 };

 int ihs_video_out_probe(struct udevice *dev)
 {
 	struct ihs_video_out_priv *priv = dev_get_priv(dev);
 	struct ofnode_phandle_args phandle_args;
 	const char *mode;
 	u16 features;
 	struct display_timing timing;
 	int res;

 	res = regmap_init_mem(dev_ofnode(dev), &priv->map);
 	if (!res) {
 		debug("%s: Could initialize regmap (err = %d)\n", dev->name,
 		      res);
 		return res;
 	}

 	/* Range with index 2 is video memory */
 	priv->vidmem = regmap_get_range(priv->map, 2);

 	mode = dev_read_string(dev, "mode");
 	if (!mode) {
 		debug("%s: Could not read mode property\n", dev->name);
 		return -EINVAL;
 	}

 	if (!strcmp(mode, "1024_768_60")) {
 		priv->sync_src = 2;
 		priv->res_x = 1024;
 		priv->res_y = 768;
 		timing.hactive.typ = 1024;
 		timing.vactive.typ = 768;
 	} else if (!strcmp(mode, "720_400_70")) {
 		priv->sync_src = 1;
 		priv->res_x = 720;
 		priv->res_y = 400;
 		timing.hactive.typ = 720;
 		timing.vactive.typ = 400;
 	} else {
 		priv->sync_src = 0;
 		priv->res_x = 640;
 		priv->res_y = 480;
 		timing.hactive.typ = 640;
 		timing.vactive.typ = 480;
 	}

 	ihs_video_out_get(priv->map, features, &features);

 	res = set_control(dev, CONTROL_FILTER_ORIGINAL |
 			       CONTROL_MODE_OSD |
 			       CONTROL_ENABLE_OFF);
 	if (res) {
 		debug("%s: Could not set control register (err = %d)\n",
 		      dev->name, res);
 		return res;
 	}

 	priv->base_width = ((features & BASE_WIDTH_MASK)
 			    >> BASE_WIDTH_SHIFT) + 1;
 	priv->base_height = ((features & BASE_HEIGTH_MASK)
 			     >> BASE_HEIGTH_SHIFT) + 1;

 	res = dev_read_phandle_with_args(dev, "clk_gen", NULL, 0, 0,
 					 &phandle_args);
 	if (res) {
 		debug("%s: Could not get clk_gen node (err = %d)\n",
 		      dev->name, res);
 		return -EINVAL;
 	}

 	res = uclass_get_device_by_ofnode(UCLASS_CLK, phandle_args.node,
 					  &priv->clk_gen);
 	if (res) {
 		debug("%s: Could not get clk_gen dev (err = %d)\n",
 		      dev->name, res);
 		return -EINVAL;
 	}

 	res = dev_read_phandle_with_args(dev, "video_tx", NULL, 0, 0,
 					 &phandle_args);
 	if (res) {
 		debug("%s: Could not get video_tx (err = %d)\n",
 		      dev->name, res);
 		return -EINVAL;
 	}

 	res = uclass_get_device_by_ofnode(UCLASS_DISPLAY, phandle_args.node,
 					  &priv->video_tx);
 	if (res) {
 		debug("%s: Could not get video_tx dev (err = %d)\n",
 		      dev->name, res);
 		return -EINVAL;
 	}

 	res = display_enable(priv->video_tx, 8, &timing);
 	if (res) {
 		debug("%s: Could not enable the display (err = %d)\n",
 		      dev->name, res);
 		return res;
 	}

 	return 0;
 }

 U_BOOT_DRIVER(ihs_video_out_drv) = {
 	.name           = "ihs_video_out_drv",
 	.id             = UCLASS_VIDEO_OSD,
 	.ops		= &ihs_video_out_ops,
 	.of_match       = ihs_video_out_ids,
 	.probe          = ihs_video_out_probe,
 	.priv_auto_alloc_size = sizeof(struct ihs_video_out_priv),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2017
	* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
	*
	* based on the gdsys osd driver, which is
	*
	* (C) Copyright 2010
	* Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.de
	*/

	#include <common.h>
	#include <display.h>
	#include <dm.h>
	#include <regmap.h>
	#include <video_osd.h>
	#include <asm/gpio.h>

	static const uint MAX_X_CHARS = 53;
	static const uint MAX_Y_CHARS = 26;
	static const uint MAX_VIDEOMEM_WIDTH = 64;
	static const uint MAX_VIDEOMEM_HEIGHT = 32;
	static const uint CHAR_WIDTH = 12;
	static const uint CHAR_HEIGHT = 18;

	static const u16 BASE_WIDTH_MASK = 0x3f00;
	static const uint BASE_WIDTH_SHIFT = 8;
	static const u16 BASE_HEIGTH_MASK = 0x001f;
	static const uint BASE_HEIGTH_SHIFT;

	struct ihs_video_out_regs {
	/* Device version register */
	u16 versions;
	/* Device feature register */
	u16 features;
	/* Device control register */
	u16 control;
	/* Register controlling screen size */
	u16 xy_size;
	/* Register controlling screen scaling */
	u16 xy_scale;
	/* Register controlling screen x position */
	u16 x_pos;
	/* Register controlling screen y position */
	u16 y_pos;
	};

	#define ihs_video_out_set(map, member, val) \
	regmap_range_set(map, 1, struct ihs_video_out_regs, member, val)

	#define ihs_video_out_get(map, member, valp) \
	regmap_range_get(map, 1, struct ihs_video_out_regs, member, valp)

	enum {
	CONTROL_FILTER_BLACK = (0 << 0),
	CONTROL_FILTER_ORIGINAL = (1 << 0),
	CONTROL_FILTER_DARKER = (2 << 0),
	CONTROL_FILTER_GRAY = (3 << 0),

	CONTROL_MODE_PASSTHROUGH = (0 << 3),
	CONTROL_MODE_OSD = (1 << 3),
	CONTROL_MODE_AUTO = (2 << 3),
	CONTROL_MODE_OFF = (3 << 3),

	CONTROL_ENABLE_OFF = (0 << 6),
	CONTROL_ENABLE_ON = (1 << 6),
	};

	struct ihs_video_out_priv {
	/* Register map for OSD device */
	struct regmap *map;
	/* Pointer to video memory */
	u16 *vidmem;
	/* Display width in text columns */
	uint base_width;
	/* Display height in text rows */
	uint base_height;
	/* x-resolution of the display in pixels */
	uint res_x;
	/* y-resolution of the display in pixels */
	uint res_y;
	/* OSD's sync mode (resolution + frequency) */
	int sync_src;
	/* The display port output for this OSD */
	struct udevice *video_tx;
	/* The pixel clock generator for the display */
	struct udevice *clk_gen;
	};

	static const struct udevice_id ihs_video_out_ids[] = {
	{ .compatible = "gdsys,ihs_video_out" },
	{ }
	};

	/**
	* set_control() - Set the control register to a given value
	*
	* The current value of sync_src is preserved by the function automatically.
	*
	* @dev: the OSD device whose control register to set
	* @value: the 16-bit value to write to the control register
	* Return: 0
	*/
	static int set_control(struct udevice *dev, u16 value)
	{
	struct ihs_video_out_priv *priv = dev_get_priv(dev);

	if (priv->sync_src)
	value \|= ((priv->sync_src & 0x7) << 8);

	ihs_video_out_set(priv->map, control, value);

	return 0;
	}

	int ihs_video_out_get_info(struct udevice dev, struct video_osd_info info)
	{
	struct ihs_video_out_priv *priv = dev_get_priv(dev);
	u16 versions;

	ihs_video_out_get(priv->map, versions, &versions);

	info->width = priv->base_width;
	info->height = priv->base_height;
	info->major_version = versions / 100;
	info->minor_version = versions % 100;

	return 0;
	}

	int ihs_video_out_set_mem(struct udevice dev, uint col, uint row, u8 buf,
	size_t buflen, uint count)
	{
	struct ihs_video_out_priv *priv = dev_get_priv(dev);
	int res;
	uint offset;
	uint k, rep;
	u16 data;

	/* Repetitions (controlled via count parmeter) */
	for (rep = 0; rep < count; ++rep) {
	offset = row * priv->base_width + col + rep * (buflen / 2);

	/* Write a single buffer copy */
	for (k = 0; k < buflen / 2; ++k) {
	uint max_size = priv->base_width * priv->base_height;

	if (offset + k >= max_size) {
	debug("%s: Write would be out of OSD bounds\n",
	dev->name);
	return -E2BIG;
	}

	data = buf[2 * k + 1] + 256 * buf[2 * k];
	out_le16(priv->vidmem + offset + k, data);
	}
	}

	res = set_control(dev, CONTROL_FILTER_ORIGINAL \|
	CONTROL_MODE_OSD \|
	CONTROL_ENABLE_ON);
	if (res) {
	debug("%s: Could not set control register\n", dev->name);
	return res;
	}

	return 0;
	}

	/**
	* div2_u16() - Approximately divide a 16-bit number by 2
	*
	* @val: The 16-bit value to divide by two
	* Return: The approximate division of val by two
	*/
	static inline u16 div2_u16(u16 val)
	{
	return (32767 * val) / 65535;
	}

	int ihs_video_out_set_size(struct udevice *dev, uint col, uint row)
	{
	struct ihs_video_out_priv *priv = dev_get_priv(dev);

	if (!col \|\| col > MAX_VIDEOMEM_WIDTH \|\| col > MAX_X_CHARS \|\|
	!row \|\| row > MAX_VIDEOMEM_HEIGHT \|\| row > MAX_Y_CHARS) {
	debug("%s: Desired OSD size invalid\n", dev->name);
	return -EINVAL;
	}

	ihs_video_out_set(priv->map, xy_size, ((col - 1) << 8) \| (row - 1));
	/* Center OSD on screen */
	ihs_video_out_set(priv->map, x_pos,
	div2_u16(priv->res_x - CHAR_WIDTH * col));
	ihs_video_out_set(priv->map, y_pos,
	div2_u16(priv->res_y - CHAR_HEIGHT * row));

	return 0;
	}

	int ihs_video_out_print(struct udevice *dev, uint col, uint row, ulong color,
	char *text)
	{
	int res;
	u8 buffer[2 * MAX_VIDEOMEM_WIDTH];
	uint k;
	uint charcount = strlen(text);
	uint len = min(charcount, 2 * MAX_VIDEOMEM_WIDTH);

	for (k = 0; k < len; ++k) {
	buffer[2 * k] = text[k];
	buffer[2 * k + 1] = color;
	}

	res = ihs_video_out_set_mem(dev, col, row, buffer, 2 * len, 1);
	if (res < 0) {
	debug("%s: Could not write to video memory\n", dev->name);
	return res;
	}

	return 0;
	}

	static const struct video_osd_ops ihs_video_out_ops = {
	.get_info = ihs_video_out_get_info,
	.set_mem = ihs_video_out_set_mem,
	.set_size = ihs_video_out_set_size,
	.print = ihs_video_out_print,
	};

	int ihs_video_out_probe(struct udevice *dev)
	{
	struct ihs_video_out_priv *priv = dev_get_priv(dev);
	struct ofnode_phandle_args phandle_args;
	const char *mode;
	u16 features;
	struct display_timing timing;
	int res;

	res = regmap_init_mem(dev_ofnode(dev), &priv->map);
	if (!res) {
	debug("%s: Could initialize regmap (err = %d)\n", dev->name,
	res);
	return res;
	}

	/* Range with index 2 is video memory */
	priv->vidmem = regmap_get_range(priv->map, 2);

	mode = dev_read_string(dev, "mode");
	if (!mode) {
	debug("%s: Could not read mode property\n", dev->name);
	return -EINVAL;
	}

	if (!strcmp(mode, "1024_768_60")) {
	priv->sync_src = 2;
	priv->res_x = 1024;
	priv->res_y = 768;
	timing.hactive.typ = 1024;
	timing.vactive.typ = 768;
	} else if (!strcmp(mode, "720_400_70")) {
	priv->sync_src = 1;
	priv->res_x = 720;
	priv->res_y = 400;
	timing.hactive.typ = 720;
	timing.vactive.typ = 400;
	} else {
	priv->sync_src = 0;
	priv->res_x = 640;
	priv->res_y = 480;
	timing.hactive.typ = 640;
	timing.vactive.typ = 480;
	}

	ihs_video_out_get(priv->map, features, &features);

	res = set_control(dev, CONTROL_FILTER_ORIGINAL \|
	CONTROL_MODE_OSD \|
	CONTROL_ENABLE_OFF);
	if (res) {
	debug("%s: Could not set control register (err = %d)\n",
	dev->name, res);
	return res;
	}

	priv->base_width = ((features & BASE_WIDTH_MASK)
	>> BASE_WIDTH_SHIFT) + 1;
	priv->base_height = ((features & BASE_HEIGTH_MASK)
	>> BASE_HEIGTH_SHIFT) + 1;

	res = dev_read_phandle_with_args(dev, "clk_gen", NULL, 0, 0,
	&phandle_args);
	if (res) {
	debug("%s: Could not get clk_gen node (err = %d)\n",
	dev->name, res);
	return -EINVAL;
	}

	res = uclass_get_device_by_ofnode(UCLASS_CLK, phandle_args.node,
	&priv->clk_gen);
	if (res) {
	debug("%s: Could not get clk_gen dev (err = %d)\n",
	dev->name, res);
	return -EINVAL;
	}

	res = dev_read_phandle_with_args(dev, "video_tx", NULL, 0, 0,
	&phandle_args);
	if (res) {
	debug("%s: Could not get video_tx (err = %d)\n",
	dev->name, res);
	return -EINVAL;
	}

	res = uclass_get_device_by_ofnode(UCLASS_DISPLAY, phandle_args.node,
	&priv->video_tx);
	if (res) {
	debug("%s: Could not get video_tx dev (err = %d)\n",
	dev->name, res);
	return -EINVAL;
	}

	res = display_enable(priv->video_tx, 8, &timing);
	if (res) {
	debug("%s: Could not enable the display (err = %d)\n",
	dev->name, res);
	return res;
	}

	return 0;
	}

	U_BOOT_DRIVER(ihs_video_out_drv) = {
	.name = "ihs_video_out_drv",
	.id = UCLASS_VIDEO_OSD,
	.ops = &ihs_video_out_ops,
	.of_match = ihs_video_out_ids,
	.probe = ihs_video_out_probe,
	.priv_auto_alloc_size = sizeof(struct ihs_video_out_priv),
	};