// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2007 Google, Inc. * Copyright (C) 2012 Intel, Inc. */ #include <linux/module.h>#include <linux/kernel.h>#include <linux/dma-mapping.h>#include <linux/errno.h>#include <linux/string.h>#include <linux/slab.h>#include <linux/delay.h>#include <linux/mm.h>#include <linux/fb.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/ioport.h>#include <linux/platform_device.h>#include <linux/acpi.h> enum {	FB_GET_WIDTH        = 0x00,	FB_GET_HEIGHT       = 0x04,	FB_INT_STATUS       = 0x08,	FB_INT_ENABLE       = 0x0c,	FB_SET_BASE         = 0x10,	FB_SET_ROTATION     = 0x14,	FB_SET_BLANK        = 0x18,	FB_GET_PHYS_WIDTH   = 0x1c,	FB_GET_PHYS_HEIGHT  = 0x20, 	FB_INT_VSYNC             = 1U << 0,	FB_INT_BASE_UPDATE_DONE  = 1U << 1}; struct goldfish_fb {	void __iomem *reg_base;	int irq;	spinlock_t lock;	wait_queue_head_t wait;	int base_update_count;	int rotation;	struct fb_info fb;	u32 cmap[16];}; static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id){	unsigned long irq_flags;	struct goldfish_fb *fb = dev_id;	u32 status; 	spin_lock_irqsave(&fb->lock, irq_flags);	status = readl(fb->reg_base + FB_INT_STATUS);	if (status & FB_INT_BASE_UPDATE_DONE) {		fb->base_update_count++;		wake_up(&fb->wait);	}	spin_unlock_irqrestore(&fb->lock, irq_flags);	return status ? IRQ_HANDLED : IRQ_NONE;} static inline u32 convert_bitfield(int val, struct fb_bitfield *bf){	unsigned int mask = (1 << bf->length) - 1; 	return (val >> (16 - bf->length) & mask) << bf->offset;} static intgoldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,		 unsigned int blue, unsigned int transp, struct fb_info *info){	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb); 	if (regno < 16) {		fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |				  convert_bitfield(blue, &fb->fb.var.blue) |				  convert_bitfield(green, &fb->fb.var.green) |				  convert_bitfield(red, &fb->fb.var.red);		return 0;	} else {		return 1;	}} static int goldfish_fb_check_var(struct fb_var_screeninfo *var,							struct fb_info *info){	if ((var->rotate & 1) != (info->var.rotate & 1)) {		if ((var->xres != info->var.yres) ||				(var->yres != info->var.xres) ||				(var->xres_virtual != info->var.yres) ||				(var->yres_virtual > info->var.xres * 2) ||				(var->yres_virtual < info->var.xres)) {			return -EINVAL;		}	} else {		if ((var->xres != info->var.xres) ||		   (var->yres != info->var.yres) ||		   (var->xres_virtual != info->var.xres) ||		   (var->yres_virtual > info->var.yres * 2) ||		   (var->yres_virtual < info->var.yres)) {			return -EINVAL;		}	}	if ((var->xoffset != info->var.xoffset) ||			(var->bits_per_pixel != info->var.bits_per_pixel) ||			(var->grayscale != info->var.grayscale)) {		return -EINVAL;	}	return 0;} static int goldfish_fb_set_par(struct fb_info *info){	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb); 	if (fb->rotation != fb->fb.var.rotate) {		info->fix.line_length = info->var.xres * 2;		fb->rotation = fb->fb.var.rotate;		writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);	}	return 0;}  static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,							struct fb_info *info){	unsigned long irq_flags;	int base_update_count;	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb); 	spin_lock_irqsave(&fb->lock, irq_flags);	base_update_count = fb->base_update_count;	writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,						fb->reg_base + FB_SET_BASE);	spin_unlock_irqrestore(&fb->lock, irq_flags);	if (!wait_event_timeout(fb->wait,				fb->base_update_count != base_update_count,				HZ / 15)) {		pr_err("%s: timeout waiting for base update\n", __func__);		return -ETIMEDOUT;	}	return 0;} static int goldfish_fb_blank(int blank, struct fb_info *info){	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb); 	switch (blank) {	case FB_BLANK_NORMAL:		writel(1, fb->reg_base + FB_SET_BLANK);		break;	case FB_BLANK_UNBLANK:		writel(0, fb->reg_base + FB_SET_BLANK);		break;	}	return 0;} static const struct fb_ops goldfish_fb_ops = {	.owner          = THIS_MODULE,	FB_DEFAULT_IOMEM_OPS,	.fb_check_var   = goldfish_fb_check_var,	.fb_set_par     = goldfish_fb_set_par,	.fb_setcolreg   = goldfish_fb_setcolreg,	.fb_pan_display = goldfish_fb_pan_display,	.fb_blank	= goldfish_fb_blank,};  static int goldfish_fb_probe(struct platform_device *pdev){	int ret;	struct goldfish_fb *fb;	size_t framesize;	u32 width, height;	dma_addr_t fbpaddr; 	fb = kzalloc_obj(*fb);	if (fb == NULL) {		ret = -ENOMEM;		goto err_fb_alloc_failed;	}	spin_lock_init(&fb->lock);	init_waitqueue_head(&fb->wait);	platform_set_drvdata(pdev, fb); 	fb->reg_base = devm_platform_ioremap_resource(pdev, 0);	if (IS_ERR(fb->reg_base)) {		ret = PTR_ERR(fb->reg_base);		goto err_no_io_base;	} 	fb->irq = platform_get_irq(pdev, 0);	if (fb->irq < 0) {		ret = fb->irq;		goto err_no_irq;	} 	width = readl(fb->reg_base + FB_GET_WIDTH);	height = readl(fb->reg_base + FB_GET_HEIGHT); 	fb->fb.fbops		= &goldfish_fb_ops;	fb->fb.pseudo_palette	= fb->cmap;	fb->fb.fix.type		= FB_TYPE_PACKED_PIXELS;	fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;	fb->fb.fix.line_length = width * 2;	fb->fb.fix.accel	= FB_ACCEL_NONE;	fb->fb.fix.ypanstep = 1; 	fb->fb.var.xres		= width;	fb->fb.var.yres		= height;	fb->fb.var.xres_virtual	= width;	fb->fb.var.yres_virtual	= height * 2;	fb->fb.var.bits_per_pixel = 16;	fb->fb.var.activate	= FB_ACTIVATE_NOW;	fb->fb.var.height	= readl(fb->reg_base + FB_GET_PHYS_HEIGHT);	fb->fb.var.width	= readl(fb->reg_base + FB_GET_PHYS_WIDTH);	fb->fb.var.pixclock	= 0; 	fb->fb.var.red.offset = 11;	fb->fb.var.red.length = 5;	fb->fb.var.green.offset = 5;	fb->fb.var.green.length = 6;	fb->fb.var.blue.offset = 0;	fb->fb.var.blue.length = 5; 	framesize = width * height * 2 * 2;	fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(						&pdev->dev, framesize,						&fbpaddr, GFP_KERNEL);	pr_debug("allocating frame buffer %d * %d, got %p\n",					width, height, fb->fb.screen_base);	if (fb->fb.screen_base == NULL) {		ret = -ENOMEM;		goto err_alloc_screen_base_failed;	}	fb->fb.fix.smem_start = fbpaddr;	fb->fb.fix.smem_len = framesize; 	ret = fb_set_var(&fb->fb, &fb->fb.var);	if (ret)		goto err_fb_set_var_failed; 	ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,							pdev->name, fb);	if (ret)		goto err_request_irq_failed; 	writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);	ret = goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */	if (ret)		goto err_pan_display_failed; 	ret = register_framebuffer(&fb->fb);	if (ret)		goto err_register_framebuffer_failed;	return 0; err_register_framebuffer_failed:err_pan_display_failed:	free_irq(fb->irq, fb);err_request_irq_failed:err_fb_set_var_failed:	dma_free_coherent(&pdev->dev, framesize,				(void *)fb->fb.screen_base,				fb->fb.fix.smem_start);err_alloc_screen_base_failed:err_no_irq:err_no_io_base:	kfree(fb);err_fb_alloc_failed:	return ret;} static void goldfish_fb_remove(struct platform_device *pdev){	size_t framesize;	struct goldfish_fb *fb = platform_get_drvdata(pdev); 	framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;	unregister_framebuffer(&fb->fb);	free_irq(fb->irq, fb); 	dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,						fb->fb.fix.smem_start);	kfree(fb);} static const struct of_device_id goldfish_fb_of_match[] = {	{ .compatible = "google,goldfish-fb", },	{},};MODULE_DEVICE_TABLE(of, goldfish_fb_of_match); #ifdef CONFIG_ACPIstatic const struct acpi_device_id goldfish_fb_acpi_match[] = {	{ "GFSH0004", 0 },	{ },};MODULE_DEVICE_TABLE(acpi, goldfish_fb_acpi_match);#endif static struct platform_driver goldfish_fb_driver = {	.probe		= goldfish_fb_probe,	.remove		= goldfish_fb_remove,	.driver = {		.name = "goldfish_fb",		.of_match_table = goldfish_fb_of_match,		.acpi_match_table = ACPI_PTR(goldfish_fb_acpi_match),	}}; module_platform_driver(goldfish_fb_driver); MODULE_DESCRIPTION("Goldfish Virtual Platform Framebuffer driver");MODULE_LICENSE("GPL v2");