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![Simon Glass](/assets/img/avatar_default.png)
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
343 lines
8.4 KiB
C
343 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2017
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* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
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*
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* based on the gdsys osd driver, which is
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*
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* (C) Copyright 2010
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* Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.de
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*/
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#include <common.h>
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#include <display.h>
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#include <dm.h>
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#include <log.h>
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#include <regmap.h>
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#include <video_osd.h>
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#include <asm/gpio.h>
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static const uint MAX_X_CHARS = 53;
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static const uint MAX_Y_CHARS = 26;
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static const uint MAX_VIDEOMEM_WIDTH = 64;
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static const uint MAX_VIDEOMEM_HEIGHT = 32;
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static const uint CHAR_WIDTH = 12;
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static const uint CHAR_HEIGHT = 18;
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static const u16 BASE_WIDTH_MASK = 0x3f00;
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static const uint BASE_WIDTH_SHIFT = 8;
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static const u16 BASE_HEIGTH_MASK = 0x001f;
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static const uint BASE_HEIGTH_SHIFT;
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struct ihs_video_out_regs {
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/* Device version register */
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u16 versions;
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/* Device feature register */
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u16 features;
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/* Device control register */
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u16 control;
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/* Register controlling screen size */
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u16 xy_size;
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/* Register controlling screen scaling */
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u16 xy_scale;
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/* Register controlling screen x position */
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u16 x_pos;
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/* Register controlling screen y position */
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u16 y_pos;
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};
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#define ihs_video_out_set(map, member, val) \
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regmap_range_set(map, 1, struct ihs_video_out_regs, member, val)
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#define ihs_video_out_get(map, member, valp) \
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regmap_range_get(map, 1, struct ihs_video_out_regs, member, valp)
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enum {
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CONTROL_FILTER_BLACK = (0 << 0),
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CONTROL_FILTER_ORIGINAL = (1 << 0),
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CONTROL_FILTER_DARKER = (2 << 0),
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CONTROL_FILTER_GRAY = (3 << 0),
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CONTROL_MODE_PASSTHROUGH = (0 << 3),
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CONTROL_MODE_OSD = (1 << 3),
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CONTROL_MODE_AUTO = (2 << 3),
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CONTROL_MODE_OFF = (3 << 3),
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CONTROL_ENABLE_OFF = (0 << 6),
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CONTROL_ENABLE_ON = (1 << 6),
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};
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struct ihs_video_out_priv {
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/* Register map for OSD device */
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struct regmap *map;
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/* Pointer to video memory */
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u16 *vidmem;
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/* Display width in text columns */
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uint base_width;
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/* Display height in text rows */
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uint base_height;
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/* x-resolution of the display in pixels */
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uint res_x;
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/* y-resolution of the display in pixels */
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uint res_y;
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/* OSD's sync mode (resolution + frequency) */
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int sync_src;
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/* The display port output for this OSD */
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struct udevice *video_tx;
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/* The pixel clock generator for the display */
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struct udevice *clk_gen;
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};
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static const struct udevice_id ihs_video_out_ids[] = {
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{ .compatible = "gdsys,ihs_video_out" },
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{ }
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};
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/**
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* set_control() - Set the control register to a given value
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*
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* The current value of sync_src is preserved by the function automatically.
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*
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* @dev: the OSD device whose control register to set
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* @value: the 16-bit value to write to the control register
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* Return: 0
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*/
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static int set_control(struct udevice *dev, u16 value)
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{
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struct ihs_video_out_priv *priv = dev_get_priv(dev);
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if (priv->sync_src)
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value |= ((priv->sync_src & 0x7) << 8);
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ihs_video_out_set(priv->map, control, value);
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return 0;
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}
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int ihs_video_out_get_info(struct udevice *dev, struct video_osd_info *info)
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{
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struct ihs_video_out_priv *priv = dev_get_priv(dev);
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u16 versions;
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ihs_video_out_get(priv->map, versions, &versions);
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info->width = priv->base_width;
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info->height = priv->base_height;
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info->major_version = versions / 100;
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info->minor_version = versions % 100;
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return 0;
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}
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int ihs_video_out_set_mem(struct udevice *dev, uint col, uint row, u8 *buf,
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size_t buflen, uint count)
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{
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struct ihs_video_out_priv *priv = dev_get_priv(dev);
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int res;
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uint offset;
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uint k, rep;
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u16 data;
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/* Repetitions (controlled via count parmeter) */
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for (rep = 0; rep < count; ++rep) {
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offset = row * priv->base_width + col + rep * (buflen / 2);
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/* Write a single buffer copy */
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for (k = 0; k < buflen / 2; ++k) {
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uint max_size = priv->base_width * priv->base_height;
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if (offset + k >= max_size) {
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debug("%s: Write would be out of OSD bounds\n",
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dev->name);
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return -E2BIG;
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}
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data = buf[2 * k + 1] + 256 * buf[2 * k];
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out_le16(priv->vidmem + offset + k, data);
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}
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}
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res = set_control(dev, CONTROL_FILTER_ORIGINAL |
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CONTROL_MODE_OSD |
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CONTROL_ENABLE_ON);
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if (res) {
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debug("%s: Could not set control register\n", dev->name);
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return res;
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}
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return 0;
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}
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/**
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* div2_u16() - Approximately divide a 16-bit number by 2
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*
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* @val: The 16-bit value to divide by two
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* Return: The approximate division of val by two
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*/
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static inline u16 div2_u16(u16 val)
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{
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return (32767 * val) / 65535;
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}
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int ihs_video_out_set_size(struct udevice *dev, uint col, uint row)
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{
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struct ihs_video_out_priv *priv = dev_get_priv(dev);
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if (!col || col > MAX_VIDEOMEM_WIDTH || col > MAX_X_CHARS ||
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!row || row > MAX_VIDEOMEM_HEIGHT || row > MAX_Y_CHARS) {
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debug("%s: Desired OSD size invalid\n", dev->name);
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return -EINVAL;
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}
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ihs_video_out_set(priv->map, xy_size, ((col - 1) << 8) | (row - 1));
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/* Center OSD on screen */
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ihs_video_out_set(priv->map, x_pos,
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div2_u16(priv->res_x - CHAR_WIDTH * col));
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ihs_video_out_set(priv->map, y_pos,
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div2_u16(priv->res_y - CHAR_HEIGHT * row));
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return 0;
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}
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int ihs_video_out_print(struct udevice *dev, uint col, uint row, ulong color,
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char *text)
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{
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int res;
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u8 buffer[2 * MAX_VIDEOMEM_WIDTH];
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uint k;
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uint charcount = strlen(text);
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uint len = min(charcount, 2 * MAX_VIDEOMEM_WIDTH);
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for (k = 0; k < len; ++k) {
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buffer[2 * k] = text[k];
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buffer[2 * k + 1] = color;
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}
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res = ihs_video_out_set_mem(dev, col, row, buffer, 2 * len, 1);
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if (res < 0) {
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debug("%s: Could not write to video memory\n", dev->name);
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return res;
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}
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return 0;
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}
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static const struct video_osd_ops ihs_video_out_ops = {
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.get_info = ihs_video_out_get_info,
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.set_mem = ihs_video_out_set_mem,
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.set_size = ihs_video_out_set_size,
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.print = ihs_video_out_print,
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};
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int ihs_video_out_probe(struct udevice *dev)
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{
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struct ihs_video_out_priv *priv = dev_get_priv(dev);
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struct ofnode_phandle_args phandle_args;
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const char *mode;
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u16 features;
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struct display_timing timing;
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int res;
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res = regmap_init_mem(dev_ofnode(dev), &priv->map);
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if (res) {
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debug("%s: Could not initialize regmap (err = %d)\n", dev->name,
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res);
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return res;
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}
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/* Range with index 2 is video memory */
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priv->vidmem = regmap_get_range(priv->map, 2);
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mode = dev_read_string(dev, "mode");
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if (!mode) {
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debug("%s: Could not read mode property\n", dev->name);
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return -EINVAL;
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}
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if (!strcmp(mode, "1024_768_60")) {
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priv->sync_src = 2;
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priv->res_x = 1024;
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priv->res_y = 768;
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timing.hactive.typ = 1024;
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timing.vactive.typ = 768;
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} else if (!strcmp(mode, "720_400_70")) {
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priv->sync_src = 1;
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priv->res_x = 720;
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priv->res_y = 400;
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timing.hactive.typ = 720;
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timing.vactive.typ = 400;
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} else {
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priv->sync_src = 0;
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priv->res_x = 640;
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priv->res_y = 480;
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timing.hactive.typ = 640;
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timing.vactive.typ = 480;
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}
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ihs_video_out_get(priv->map, features, &features);
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res = set_control(dev, CONTROL_FILTER_ORIGINAL |
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CONTROL_MODE_OSD |
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CONTROL_ENABLE_OFF);
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if (res) {
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debug("%s: Could not set control register (err = %d)\n",
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dev->name, res);
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return res;
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}
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priv->base_width = ((features & BASE_WIDTH_MASK)
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>> BASE_WIDTH_SHIFT) + 1;
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priv->base_height = ((features & BASE_HEIGTH_MASK)
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>> BASE_HEIGTH_SHIFT) + 1;
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res = dev_read_phandle_with_args(dev, "clk_gen", NULL, 0, 0,
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&phandle_args);
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if (res) {
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debug("%s: Could not get clk_gen node (err = %d)\n",
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dev->name, res);
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return -EINVAL;
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}
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res = uclass_get_device_by_ofnode(UCLASS_CLK, phandle_args.node,
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&priv->clk_gen);
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if (res) {
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debug("%s: Could not get clk_gen dev (err = %d)\n",
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dev->name, res);
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return -EINVAL;
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}
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res = dev_read_phandle_with_args(dev, "video_tx", NULL, 0, 0,
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&phandle_args);
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if (res) {
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debug("%s: Could not get video_tx (err = %d)\n",
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dev->name, res);
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return -EINVAL;
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}
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res = uclass_get_device_by_ofnode(UCLASS_DISPLAY, phandle_args.node,
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&priv->video_tx);
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if (res) {
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debug("%s: Could not get video_tx dev (err = %d)\n",
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dev->name, res);
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return -EINVAL;
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}
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res = display_enable(priv->video_tx, 8, &timing);
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if (res && res != -EIO) { /* Ignore missing DP sink error */
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debug("%s: Could not enable the display (err = %d)\n",
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dev->name, res);
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return res;
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}
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return 0;
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}
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U_BOOT_DRIVER(ihs_video_out_drv) = {
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.name = "ihs_video_out_drv",
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.id = UCLASS_VIDEO_OSD,
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.ops = &ihs_video_out_ops,
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.of_match = ihs_video_out_ids,
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.probe = ihs_video_out_probe,
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.priv_auto = sizeof(struct ihs_video_out_priv),
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};
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