/* * Simplest possible simple frame-buffer driver, as a platform device * * Copyright (c) 2013, Stephen Warren * * Based on q40fb.c, which was: * Copyright (C) 2001 Richard Zidlicky <rz@linux-m68k.org> * * Also based on offb.c, which was: * Copyright (C) 1997 Geert Uytterhoeven * Copyright (C) 1996 Paul Mackerras * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for * more details. */ #include <linux/errno.h>#include <linux/fb.h>#include <linux/io.h>#include <linux/module.h>#include <linux/platform_data/simplefb.h>#include <linux/platform_device.h> static struct fb_fix_screeninfo simplefb_fix = {	.id		= "simple",	.type		= FB_TYPE_PACKED_PIXELS,	.visual		= FB_VISUAL_TRUECOLOR,	.accel		= FB_ACCEL_NONE,}; static struct fb_var_screeninfo simplefb_var = {	.height		= -1,	.width		= -1,	.activate	= FB_ACTIVATE_NOW,	.vmode		= FB_VMODE_NONINTERLACED,}; static int simplefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,			      u_int transp, struct fb_info *info){	u32 *pal = info->pseudo_palette;	u32 cr = red >> (16 - info->var.red.length);	u32 cg = green >> (16 - info->var.green.length);	u32 cb = blue >> (16 - info->var.blue.length);	u32 value; 	if (regno >= 16)		return -EINVAL; 	value = (cr << info->var.red.offset) |		(cg << info->var.green.offset) |		(cb << info->var.blue.offset);	if (info->var.transp.length > 0) {		u32 mask = (1 << info->var.transp.length) - 1;		mask <<= info->var.transp.offset;		value |= mask;	}	pal[regno] = value; 	return 0;} static void simplefb_destroy(struct fb_info *info){	if (info->screen_base)		iounmap(info->screen_base);} static struct fb_ops simplefb_ops = {	.owner		= THIS_MODULE,	.fb_destroy	= simplefb_destroy,	.fb_setcolreg	= simplefb_setcolreg,	.fb_fillrect	= cfb_fillrect,	.fb_copyarea	= cfb_copyarea,	.fb_imageblit	= cfb_imageblit,}; static struct simplefb_format simplefb_formats[] = SIMPLEFB_FORMATS; struct simplefb_params {	u32 width;	u32 height;	u32 stride;	struct simplefb_format *format;}; static int simplefb_parse_dt(struct platform_device *pdev,			   struct simplefb_params *params){	struct device_node *np = pdev->dev.of_node;	int ret;	const char *format;	int i; 	ret = of_property_read_u32(np, "width", &params->width);	if (ret) {		dev_err(&pdev->dev, "Can't parse width property\n");		return ret;	} 	ret = of_property_read_u32(np, "height", &params->height);	if (ret) {		dev_err(&pdev->dev, "Can't parse height property\n");		return ret;	} 	ret = of_property_read_u32(np, "stride", &params->stride);	if (ret) {		dev_err(&pdev->dev, "Can't parse stride property\n");		return ret;	} 	ret = of_property_read_string(np, "format", &format);	if (ret) {		dev_err(&pdev->dev, "Can't parse format property\n");		return ret;	}	params->format = NULL;	for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) {		if (strcmp(format, simplefb_formats[i].name))			continue;		params->format = &simplefb_formats[i];		break;	}	if (!params->format) {		dev_err(&pdev->dev, "Invalid format value\n");		return -EINVAL;	} 	return 0;} static int simplefb_parse_pd(struct platform_device *pdev,			     struct simplefb_params *params){	struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);	int i; 	params->width = pd->width;	params->height = pd->height;	params->stride = pd->stride; 	params->format = NULL;	for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) {		if (strcmp(pd->format, simplefb_formats[i].name))			continue; 		params->format = &simplefb_formats[i];		break;	} 	if (!params->format) {		dev_err(&pdev->dev, "Invalid format value\n");		return -EINVAL;	} 	return 0;} static int simplefb_probe(struct platform_device *pdev){	int ret;	struct simplefb_params params;	struct fb_info *info;	struct resource *mem; 	if (fb_get_options("simplefb", NULL))		return -ENODEV; 	ret = -ENODEV;	if (dev_get_platdata(&pdev->dev))		ret = simplefb_parse_pd(pdev, &params);	else if (pdev->dev.of_node)		ret = simplefb_parse_dt(pdev, &params); 	if (ret)		return ret; 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);	if (!mem) {		dev_err(&pdev->dev, "No memory resource\n");		return -EINVAL;	} 	info = framebuffer_alloc(sizeof(u32) * 16, &pdev->dev);	if (!info)		return -ENOMEM;	platform_set_drvdata(pdev, info); 	info->fix = simplefb_fix;	info->fix.smem_start = mem->start;	info->fix.smem_len = resource_size(mem);	info->fix.line_length = params.stride; 	info->var = simplefb_var;	info->var.xres = params.width;	info->var.yres = params.height;	info->var.xres_virtual = params.width;	info->var.yres_virtual = params.height;	info->var.bits_per_pixel = params.format->bits_per_pixel;	info->var.red = params.format->red;	info->var.green = params.format->green;	info->var.blue = params.format->blue;	info->var.transp = params.format->transp; 	info->apertures = alloc_apertures(1);	if (!info->apertures) {		framebuffer_release(info);		return -ENOMEM;	}	info->apertures->ranges[0].base = info->fix.smem_start;	info->apertures->ranges[0].size = info->fix.smem_len; 	info->fbops = &simplefb_ops;	info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE;	info->screen_base = ioremap_wc(info->fix.smem_start,				       info->fix.smem_len);	if (!info->screen_base) {		framebuffer_release(info);		return -ENODEV;	}	info->pseudo_palette = (void *)(info + 1); 	dev_info(&pdev->dev, "framebuffer at 0x%lx, 0x%x bytes, mapped to 0x%p\n",			     info->fix.smem_start, info->fix.smem_len,			     info->screen_base);	dev_info(&pdev->dev, "format=%s, mode=%dx%dx%d, linelength=%d\n",			     params.format->name,			     info->var.xres, info->var.yres,			     info->var.bits_per_pixel, info->fix.line_length); 	ret = register_framebuffer(info);	if (ret < 0) {		dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret);		iounmap(info->screen_base);		framebuffer_release(info);		return ret;	} 	dev_info(&pdev->dev, "fb%d: simplefb registered!\n", info->node); 	return 0;} static int simplefb_remove(struct platform_device *pdev){	struct fb_info *info = platform_get_drvdata(pdev); 	unregister_framebuffer(info);	framebuffer_release(info); 	return 0;} static const struct of_device_id simplefb_of_match[] = {	{ .compatible = "simple-framebuffer", },	{ },};MODULE_DEVICE_TABLE(of, simplefb_of_match); static struct platform_driver simplefb_driver = {	.driver = {		.name = "simple-framebuffer",		.owner = THIS_MODULE,		.of_match_table = simplefb_of_match,	},	.probe = simplefb_probe,	.remove = simplefb_remove,};module_platform_driver(simplefb_driver); MODULE_AUTHOR("Stephen Warren <swarren@wwwdotorg.org>");MODULE_DESCRIPTION("Simple framebuffer driver");MODULE_LICENSE("GPL v2");