common/lcd.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Common LCD routines
 *
 * (C) Copyright 2001-2002
 * Wolfgang Denk, DENX Software Engineering -- wd@denx.de
 */

/* #define DEBUG */
#include <config.h>
#include <common.h>
#include <command.h>
#include <cpu_func.h>
#include <env_callback.h>
#include <log.h>
#include <asm/cache.h>
#include <init.h>
#include <asm/global_data.h>
#include <linux/types.h>
#include <stdio_dev.h>
#include <lcd.h>
#include <mapmem.h>
#include <watchdog.h>
#include <asm/unaligned.h>
#include <splash.h>
#include <asm/io.h>
#include <asm/unaligned.h>
#include <video_font.h>

#if (LCD_BPP != LCD_COLOR8) && (LCD_BPP != LCD_COLOR16) && \
	(LCD_BPP != LCD_COLOR32)
#error Unsupported LCD BPP.
#endif

DECLARE_GLOBAL_DATA_PTR;

static int lcd_init(void *lcdbase);
static void lcd_logo(void);
static void lcd_setfgcolor(int color);
static void lcd_setbgcolor(int color);

static int lcd_color_fg;
static int lcd_color_bg;
int lcd_line_length;
char lcd_is_enabled = 0;
static void *lcd_base;			/* Start of framebuffer memory	*/
static char lcd_flush_dcache;	/* 1 to flush dcache after each lcd update */

/* Flush LCD activity to the caches */
void lcd_sync(void)
{
	/*
	 * flush_dcache_range() is declared in common.h but it seems that some
	 * architectures do not actually implement it. Is there a way to find
	 * out whether it exists? For now, ARM is safe.
	 */
#if defined(CONFIG_ARM) && !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
	int line_length;

	if (lcd_flush_dcache)
		flush_dcache_range((ulong)lcd_base,
			(ulong)(lcd_base + lcd_get_size(&line_length)));
#endif
}

void lcd_set_flush_dcache(int flush)
{
	lcd_flush_dcache = (flush != 0);
}

static void lcd_stub_putc(struct stdio_dev *dev, const char c)
{
	lcd_putc(c);
}

static void lcd_stub_puts(struct stdio_dev *dev, const char *s)
{
	lcd_puts(s);
}

/*
 * With most lcd drivers the line length is set up
 * by calculating it from panel_info parameters. Some
 * drivers need to calculate the line length differently,
 * so make the function weak to allow overriding it.
 */
__weak int lcd_get_size(int *line_length)
{
	*line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
	return *line_length * panel_info.vl_row;
}

int drv_lcd_init(void)
{
	struct stdio_dev lcddev;
	int rc;

	lcd_base = map_sysmem(gd->fb_base, 0);

	lcd_init(lcd_base);

	/* Device initialization */
	memset(&lcddev, 0, sizeof(lcddev));

	strcpy(lcddev.name, "lcd");
	lcddev.ext   = 0;			/* No extensions */
	lcddev.flags = DEV_FLAGS_OUTPUT;	/* Output only */
	lcddev.putc  = lcd_stub_putc;		/* 'putc' function */
	lcddev.puts  = lcd_stub_puts;		/* 'puts' function */

	rc = stdio_register(&lcddev);

	return (rc == 0) ? 1 : rc;
}

void lcd_clear(void)
{
	int bg_color;
	__maybe_unused ulong addr;
	static int do_splash = 1;
#if LCD_BPP == LCD_COLOR8
	/* Setting the palette */
	lcd_setcolreg(CONSOLE_COLOR_BLACK, 0, 0, 0);
	lcd_setcolreg(CONSOLE_COLOR_RED, 0xFF, 0, 0);
	lcd_setcolreg(CONSOLE_COLOR_GREEN, 0, 0xFF, 0);
	lcd_setcolreg(CONSOLE_COLOR_YELLOW, 0xFF, 0xFF, 0);
	lcd_setcolreg(CONSOLE_COLOR_BLUE, 0, 0, 0xFF);
	lcd_setcolreg(CONSOLE_COLOR_MAGENTA, 0xFF, 0, 0xFF);
	lcd_setcolreg(CONSOLE_COLOR_CYAN, 0, 0xFF, 0xFF);
	lcd_setcolreg(CONSOLE_COLOR_GREY, 0xAA, 0xAA, 0xAA);
	lcd_setcolreg(CONSOLE_COLOR_WHITE, 0xFF, 0xFF, 0xFF);
#endif

#ifndef CONFIG_SYS_WHITE_ON_BLACK
	lcd_setfgcolor(CONSOLE_COLOR_BLACK);
	lcd_setbgcolor(CONSOLE_COLOR_WHITE);
	bg_color = CONSOLE_COLOR_WHITE;
#else
	lcd_setfgcolor(CONSOLE_COLOR_WHITE);
	lcd_setbgcolor(CONSOLE_COLOR_BLACK);
	bg_color = CONSOLE_COLOR_BLACK;
#endif	/* CONFIG_SYS_WHITE_ON_BLACK */

	/* set framebuffer to background color */
#if (LCD_BPP != LCD_COLOR32)
	memset((char *)lcd_base, bg_color, lcd_line_length * panel_info.vl_row);
#else
	u32 *ppix = lcd_base;
	u32 i;
	for (i = 0;
	   i < (lcd_line_length * panel_info.vl_row)/NBYTES(panel_info.vl_bpix);
	   i++) {
		*ppix++ = bg_color;
	}
#endif
	/* setup text-console */
	debug("[LCD] setting up console...\n");
	lcd_init_console(lcd_base,
			 panel_info.vl_col,
			 panel_info.vl_row,
			 panel_info.vl_rot);
	/* Paint the logo and retrieve LCD base address */
	debug("[LCD] Drawing the logo...\n");
	if (do_splash) {
		if (splash_display() == 0) {
			do_splash = 0;
			lcd_sync();
			return;
		}
	}

	lcd_logo();
	lcd_sync();
}

static int lcd_init(void *lcdbase)
{
	debug("[LCD] Initializing LCD frambuffer at %p\n", lcdbase);
	lcd_ctrl_init(lcdbase);

	/*
	 * lcd_ctrl_init() of some drivers (i.e. bcm2835 on rpi) ignores
	 * the 'lcdbase' argument and uses custom lcd base address
	 * by setting up gd->fb_base. Check for this condition and fixup
	 * 'lcd_base' address.
	 */
	if (map_to_sysmem(lcdbase) != gd->fb_base)
		lcd_base = map_sysmem(gd->fb_base, 0);

	debug("[LCD] Using LCD frambuffer at %p\n", lcd_base);

	lcd_get_size(&lcd_line_length);
	lcd_is_enabled = 1;
	lcd_clear();
	lcd_enable();

	/* Initialize the console */
	lcd_set_col(0);
	lcd_set_row(1);	/* leave 1 blank line below logo */

	return 0;
}

/*
 * This is called early in the system initialization to grab memory
 * for the LCD controller.
 * Returns new address for monitor, after reserving LCD buffer memory
 *
 * Note that this is running from ROM, so no write access to global data.
 */
ulong lcd_setmem(ulong addr)
{
	ulong size;
	int line_length;

	debug("LCD panel info: %d x %d, %d bit/pix\n", panel_info.vl_col,
		panel_info.vl_row, NBITS(panel_info.vl_bpix));

	size = lcd_get_size(&line_length);

	/* Allocate pages for the frame buffer. */
	addr -= size;

	debug("Reserving %ldk for LCD Framebuffer at: %08lx\n",
	      size >> 10, addr);

	return addr;
}

static void lcd_setfgcolor(int color)
{
	lcd_color_fg = color;
}

int lcd_getfgcolor(void)
{
	return lcd_color_fg;
}

static void lcd_setbgcolor(int color)
{
	lcd_color_bg = color;
}

int lcd_getbgcolor(void)
{
	return lcd_color_bg;
}

static inline void lcd_logo_plot(int x, int y) {}

#if defined(CONFIG_CMD_BMP) || defined(CONFIG_SPLASH_SCREEN)
#ifdef CONFIG_SPLASH_SCREEN_ALIGN

static void splash_align_axis(int *axis, unsigned long panel_size,
					unsigned long picture_size)
{
	unsigned long panel_picture_delta = panel_size - picture_size;
	unsigned long axis_alignment;

	if (*axis == BMP_ALIGN_CENTER)
		axis_alignment = panel_picture_delta / 2;
	else if (*axis < 0)
		axis_alignment = panel_picture_delta + *axis + 1;
	else
		return;

	*axis = max(0, (int)axis_alignment);
}
#endif

__weak void fb_put_byte(uchar **fb, uchar **from)
{
	*(*fb)++ = *(*from)++;
}

#if defined(CONFIG_BMP_16BPP)
__weak void fb_put_word(uchar **fb, uchar **from)
{
	*(*fb)++ = *(*from)++;
	*(*fb)++ = *(*from)++;
}
#endif /* CONFIG_BMP_16BPP */

__weak void lcd_set_cmap(struct bmp_image *bmp, unsigned colors)
{
	int i;
	struct bmp_color_table_entry cte;
	ushort *cmap = configuration_get_cmap();

	for (i = 0; i < colors; ++i) {
		cte = bmp->color_table[i];
		*cmap = (((cte.red)   << 8) & 0xf800) |
			(((cte.green) << 3) & 0x07e0) |
			(((cte.blue)  >> 3) & 0x001f);
		cmap++;
	}
}

int lcd_display_bitmap(ulong bmp_image, int x, int y)
{
	ushort *cmap_base = NULL;
	ushort i, j;
	uchar *fb;
	struct bmp_image *bmp = (struct bmp_image *)map_sysmem(bmp_image, 0);
	uchar *bmap;
	ushort padded_width;
	unsigned long width, height, byte_width;
	unsigned long pwidth = panel_info.vl_col;
	unsigned colors, bpix, bmp_bpix;
	int hdr_size;
	struct bmp_color_table_entry *palette;

	if (!bmp || !(bmp->header.signature[0] == 'B' &&
		bmp->header.signature[1] == 'M')) {
		printf("Error: no valid bmp image at %lx\n", bmp_image);

		return 1;
	}

	palette = bmp->color_table;
	width = get_unaligned_le32(&bmp->header.width);
	height = get_unaligned_le32(&bmp->header.height);
	bmp_bpix = get_unaligned_le16(&bmp->header.bit_count);
	hdr_size = get_unaligned_le16(&bmp->header.size);
	debug("hdr_size=%d, bmp_bpix=%d\n", hdr_size, bmp_bpix);

	colors = 1 << bmp_bpix;

	bpix = NBITS(panel_info.vl_bpix);

	if (bpix != 1 && bpix != 8 && bpix != 16 && bpix != 32) {
		printf ("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
			bpix, bmp_bpix);

		return 1;
	}

	/*
	 * We support displaying 8bpp BMPs on 16bpp LCDs
	 * and displaying 24bpp BMPs on 32bpp LCDs
	 * */
	if (bpix != bmp_bpix &&
	    !(bmp_bpix == 8 && bpix == 16) &&
	    !(bmp_bpix == 24 && bpix == 32)) {
		printf ("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
			bpix, get_unaligned_le16(&bmp->header.bit_count));
		return 1;
	}

	debug("Display-bmp: %d x %d  with %d colors, display %d\n",
	      (int)width, (int)height, (int)colors, 1 << bpix);

	if (bmp_bpix == 8)
		lcd_set_cmap(bmp, colors);

	padded_width = (width & 0x3 ? (width & ~0x3) + 4 : width);

#ifdef CONFIG_SPLASH_SCREEN_ALIGN
	splash_align_axis(&x, pwidth, width);
	splash_align_axis(&y, panel_info.vl_row, height);
#endif /* CONFIG_SPLASH_SCREEN_ALIGN */

	if ((x + width) > pwidth)
		width = pwidth - x;
	if ((y + height) > panel_info.vl_row)
		height = panel_info.vl_row - y;

	bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
	fb   = (uchar *)(lcd_base +
		(y + height - 1) * lcd_line_length + x * bpix / 8);

	switch (bmp_bpix) {
	case 1:
	case 8: {
		cmap_base = configuration_get_cmap();

		if (bpix != 16)
			byte_width = width;
		else
			byte_width = width * 2;

		for (i = 0; i < height; ++i) {
			schedule();
			for (j = 0; j < width; j++) {
				if (bpix != 16) {
					fb_put_byte(&fb, &bmap);
				} else {
					struct bmp_color_table_entry *entry;
					uint val;

					if (cmap_base) {
						val = cmap_base[*bmap];
					} else {
						entry = &palette[*bmap];
						val = entry->blue >> 3 |
							entry->green >> 2 << 5 |
							entry->red >> 3 << 11;
					}
					*(uint16_t *)fb = val;
					bmap++;
					fb += sizeof(uint16_t) / sizeof(*fb);
				}
			}
			bmap += (padded_width - width);
			fb -= byte_width + lcd_line_length;
		}
		break;
	}
#if defined(CONFIG_BMP_16BPP)
	case 16:
		for (i = 0; i < height; ++i) {
			schedule();
			for (j = 0; j < width; j++)
				fb_put_word(&fb, &bmap);

			bmap += (padded_width - width) * 2;
			fb -= width * 2 + lcd_line_length;
		}
		break;
#endif /* CONFIG_BMP_16BPP */
#if defined(CONFIG_BMP_24BPP)
	case 24:
		for (i = 0; i < height; ++i) {
			for (j = 0; j < width; j++) {
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = 0;
			}
			fb -= lcd_line_length + width * (bpix / 8);
		}
		break;
#endif /* CONFIG_BMP_24BPP */
#if defined(CONFIG_BMP_32BPP)
	case 32:
		for (i = 0; i < height; ++i) {
			for (j = 0; j < width; j++) {
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
			}
			fb -= lcd_line_length + width * (bpix / 8);
		}
		break;
#endif /* CONFIG_BMP_32BPP */
	default:
		break;
	};

	lcd_sync();
	return 0;
}
#endif

static void lcd_logo(void)
{
	lcd_logo_plot(0, 0);

}

#ifdef CONFIG_SPLASHIMAGE_GUARD
static int on_splashimage(const char *name, const char *value, enum env_op op,
	int flags)
{
	ulong addr;
	int aligned;

	if (op == env_op_delete)
		return 0;

	addr = hextoul(value, NULL);
	/* See README.displaying-bmps */
	aligned = (addr % 4 == 2);
	if (!aligned) {
		printf("Invalid splashimage value. Value must be 16 bit aligned, but not 32 bit aligned\n");
		return -1;
	}

	return 0;
}

U_BOOT_ENV_CALLBACK(splashimage, on_splashimage);
#endif

int lcd_get_pixel_width(void)
{
	return panel_info.vl_col;
}

int lcd_get_pixel_height(void)
{
	return panel_info.vl_row;
}