From f8101c780fdc050eda9f93c94f8841de9f384b4f Mon Sep 17 00:00:00 2001 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@google.com> Date: Fri, 29 Jun 2007 22:14:27 -0700 Subject: [PATCH 128/134] [ARM] goldfish: fb: Add fb driver for goldfish. MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Supports panning for double buffering. Signed-off-by: Mike A. Chan <mikechan@google.com> Signed-off-by: Arve Hjønnevåg <arve@android.com> --- drivers/video/Kconfig | 9 ++ drivers/video/Makefile | 1 + drivers/video/goldfishfb.c | 334 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 344 insertions(+), 0 deletions(-) create mode 100644 drivers/video/goldfishfb.c --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -2005,6 +2005,15 @@ config FB_XILINX framebuffer. ML300 carries a 640*480 LCD display on the board, ML403 uses a standard DB15 VGA connector. +config FB_GOLDFISH + tristate "Goldfish Framebuffer" + depends on FB + select FB_CFB_FILLRECT + select FB_CFB_COPYAREA + select FB_CFB_IMAGEBLIT + ---help--- + Framebuffer driver for Goldfish Virtual Platform + config FB_COBALT tristate "Cobalt server LCD frame buffer support" depends on FB && MIPS_COBALT --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -92,6 +92,7 @@ obj-$(CONFIG_FB_ATMEL) += atmel_lcdfb obj-$(CONFIG_FB_PVR2) += pvr2fb.o obj-$(CONFIG_FB_VOODOO1) += sstfb.o obj-$(CONFIG_FB_ARMCLCD) += amba-clcd.o +obj-$(CONFIG_FB_GOLDFISH) += goldfishfb.o obj-$(CONFIG_FB_68328) += 68328fb.o obj-$(CONFIG_FB_GBE) += gbefb.o obj-$(CONFIG_FB_CIRRUS) += cirrusfb.o --- /dev/null +++ b/drivers/video/goldfishfb.c @@ -0,0 +1,334 @@ +/* drivers/video/goldfishfb.c +** +** Copyright (C) 2007 Google, Inc. +** +** This software is licensed under the terms of the GNU General Public +** License version 2, as published by the Free Software Foundation, and +** may be copied, distributed, and modified under those terms. +** +** This program is distributed in the hope that 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/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> +#ifdef CONFIG_ANDROID_POWER +#include <linux/android_power.h> +#endif + +#include <mach/hardware.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 { + uint32_t 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]; +#ifdef CONFIG_ANDROID_POWER + android_early_suspend_t early_suspend; +#endif +}; + +static irqreturn_t +goldfish_fb_interrupt(int irq, void *dev_id) +{ + unsigned long irq_flags; + struct goldfish_fb *fb = dev_id; + uint32_t 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 int +goldfish_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); + wait_event_timeout(fb->wait, fb->base_update_count != base_update_count, HZ / 15); + if(fb->base_update_count == base_update_count) + printk("goldfish_fb_pan_display: timeout wating for base update\n"); + return 0; +} + +#ifdef CONFIG_ANDROID_POWER +static void goldfish_fb_early_suspend(android_early_suspend_t *h) +{ + struct goldfish_fb *fb = container_of(h, struct goldfish_fb, early_suspend); + writel(1, fb->reg_base + FB_SET_BLANK); +} + +static void goldfish_fb_late_resume(android_early_suspend_t *h) +{ + struct goldfish_fb *fb = container_of(h, struct goldfish_fb, early_suspend); + writel(0, fb->reg_base + FB_SET_BLANK); +} +#endif + +static struct fb_ops goldfish_fb_ops = { + .owner = THIS_MODULE, + .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_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + + +static int goldfish_fb_probe(struct platform_device *pdev) +{ + int ret; + struct resource *r; + struct goldfish_fb *fb; + size_t framesize; + uint32_t width, height; + dma_addr_t fbpaddr; + + fb = kzalloc(sizeof(*fb), GFP_KERNEL); + 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); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if(r == NULL) { + ret = -ENODEV; + goto err_no_io_base; + } + fb->reg_base = IO_ADDRESS(r->start - IO_START); + + fb->irq = platform_get_irq(pdev, 0); + if(fb->irq < 0) { + ret = -ENODEV; + 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.flags = FBINFO_FLAG_DEFAULT; + fb->fb.pseudo_palette = fb->cmap; + //strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id)); + 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.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 = dma_alloc_writecombine(&pdev->dev, framesize, + &fbpaddr, GFP_KERNEL); + printk("allocating frame buffer %d * %d, got %p\n", width, height, fb->fb.screen_base); + if(fb->fb.screen_base == 0) { + 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); + goldfish_fb_pan_display(&fb->fb.var, &fb->fb); // updates base + + ret = register_framebuffer(&fb->fb); + if(ret) + goto err_register_framebuffer_failed; + +#ifdef CONFIG_ANDROID_POWER + fb->early_suspend.suspend = goldfish_fb_early_suspend; + fb->early_suspend.resume = goldfish_fb_late_resume; + android_register_early_suspend(&fb->early_suspend); +#endif + + return 0; + + +err_register_framebuffer_failed: + free_irq(fb->irq, fb); +err_request_irq_failed: +err_fb_set_var_failed: + dma_free_writecombine(&pdev->dev, framesize, 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 int 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; + +#ifdef CONFIG_ANDROID_POWER + android_unregister_early_suspend(&fb->early_suspend); +#endif + unregister_framebuffer(&fb->fb); + free_irq(fb->irq, fb); + dma_free_writecombine(&pdev->dev, framesize, fb->fb.screen_base, fb->fb.fix.smem_start); + kfree(fb); + return 0; +} + + +static struct platform_driver goldfish_fb_driver = { + .probe = goldfish_fb_probe, + .remove = goldfish_fb_remove, + .driver = { + .name = "goldfish_fb" + } +}; + +static int __init goldfish_fb_init(void) +{ + return platform_driver_register(&goldfish_fb_driver); +} + +static void __exit goldfish_fb_exit(void) +{ + platform_driver_unregister(&goldfish_fb_driver); +} + +module_init(goldfish_fb_init); +module_exit(goldfish_fb_exit); +