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![David Herrmann](/assets/img/avatar_default.png)
fbdev-core uses FBINFO_MISC_FIRMWARE to mark drivers that use firmware framebuffers. Furthermore, we now allocate apertures for the fbinfo device. Both information is used by remove_conflicting_framebuffers() to remove a fbdev device whenever a real driver is loaded. This is used heavily on x86 for VGA/vesa/EFI framebuffers, but is also of great use for all other systems. Especially with x86 support for simplefb, this information is needed to unload simplefb before a real hw-driver (like i915, radeon, nouveau) is loaded. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Link: http://lkml.kernel.org/r/1375445127-15480-3-git-send-email-dh.herrmann@gmail.com Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
264 lines
6.4 KiB
C
264 lines
6.4 KiB
C
/*
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* Simplest possible simple frame-buffer driver, as a platform device
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*
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* Copyright (c) 2013, Stephen Warren
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*
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* Based on q40fb.c, which was:
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* Copyright (C) 2001 Richard Zidlicky <rz@linux-m68k.org>
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*
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* Also based on offb.c, which was:
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* Copyright (C) 1997 Geert Uytterhoeven
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* Copyright (C) 1996 Paul Mackerras
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/errno.h>
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#include <linux/fb.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_data/simplefb.h>
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#include <linux/platform_device.h>
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static struct fb_fix_screeninfo simplefb_fix = {
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.id = "simple",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_TRUECOLOR,
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.accel = FB_ACCEL_NONE,
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};
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static struct fb_var_screeninfo simplefb_var = {
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.height = -1,
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.width = -1,
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.activate = FB_ACTIVATE_NOW,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static int simplefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
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u_int transp, struct fb_info *info)
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{
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u32 *pal = info->pseudo_palette;
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u32 cr = red >> (16 - info->var.red.length);
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u32 cg = green >> (16 - info->var.green.length);
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u32 cb = blue >> (16 - info->var.blue.length);
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u32 value;
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if (regno >= 16)
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return -EINVAL;
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value = (cr << info->var.red.offset) |
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(cg << info->var.green.offset) |
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(cb << info->var.blue.offset);
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if (info->var.transp.length > 0) {
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u32 mask = (1 << info->var.transp.length) - 1;
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mask <<= info->var.transp.offset;
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value |= mask;
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}
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pal[regno] = value;
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return 0;
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}
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static struct fb_ops simplefb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = simplefb_setcolreg,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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};
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static struct simplefb_format simplefb_formats[] = SIMPLEFB_FORMATS;
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struct simplefb_params {
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u32 width;
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u32 height;
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u32 stride;
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struct simplefb_format *format;
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};
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static int simplefb_parse_dt(struct platform_device *pdev,
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struct simplefb_params *params)
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{
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struct device_node *np = pdev->dev.of_node;
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int ret;
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const char *format;
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int i;
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ret = of_property_read_u32(np, "width", ¶ms->width);
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if (ret) {
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dev_err(&pdev->dev, "Can't parse width property\n");
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return ret;
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}
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ret = of_property_read_u32(np, "height", ¶ms->height);
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if (ret) {
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dev_err(&pdev->dev, "Can't parse height property\n");
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return ret;
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}
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ret = of_property_read_u32(np, "stride", ¶ms->stride);
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if (ret) {
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dev_err(&pdev->dev, "Can't parse stride property\n");
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return ret;
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}
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ret = of_property_read_string(np, "format", &format);
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if (ret) {
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dev_err(&pdev->dev, "Can't parse format property\n");
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return ret;
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}
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params->format = NULL;
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for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) {
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if (strcmp(format, simplefb_formats[i].name))
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continue;
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params->format = &simplefb_formats[i];
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break;
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}
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if (!params->format) {
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dev_err(&pdev->dev, "Invalid format value\n");
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return -EINVAL;
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}
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return 0;
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}
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static int simplefb_parse_pd(struct platform_device *pdev,
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struct simplefb_params *params)
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{
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struct simplefb_platform_data *pd = pdev->dev.platform_data;
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int i;
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params->width = pd->width;
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params->height = pd->height;
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params->stride = pd->stride;
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params->format = NULL;
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for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) {
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if (strcmp(pd->format, simplefb_formats[i].name))
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continue;
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params->format = &simplefb_formats[i];
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break;
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}
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if (!params->format) {
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dev_err(&pdev->dev, "Invalid format value\n");
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return -EINVAL;
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}
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return 0;
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}
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static int simplefb_probe(struct platform_device *pdev)
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{
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int ret;
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struct simplefb_params params;
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struct fb_info *info;
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struct resource *mem;
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if (fb_get_options("simplefb", NULL))
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return -ENODEV;
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ret = -ENODEV;
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if (pdev->dev.platform_data)
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ret = simplefb_parse_pd(pdev, ¶ms);
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else if (pdev->dev.of_node)
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ret = simplefb_parse_dt(pdev, ¶ms);
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if (ret)
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return ret;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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dev_err(&pdev->dev, "No memory resource\n");
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return -EINVAL;
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}
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info = framebuffer_alloc(sizeof(u32) * 16, &pdev->dev);
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if (!info)
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return -ENOMEM;
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platform_set_drvdata(pdev, info);
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info->fix = simplefb_fix;
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info->fix.smem_start = mem->start;
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info->fix.smem_len = resource_size(mem);
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info->fix.line_length = params.stride;
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info->var = simplefb_var;
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info->var.xres = params.width;
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info->var.yres = params.height;
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info->var.xres_virtual = params.width;
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info->var.yres_virtual = params.height;
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info->var.bits_per_pixel = params.format->bits_per_pixel;
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info->var.red = params.format->red;
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info->var.green = params.format->green;
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info->var.blue = params.format->blue;
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info->var.transp = params.format->transp;
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info->apertures = alloc_apertures(1);
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if (!info->apertures) {
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framebuffer_release(info);
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return -ENOMEM;
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}
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info->apertures->ranges[0].base = info->fix.smem_start;
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info->apertures->ranges[0].size = info->fix.smem_len;
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info->fbops = &simplefb_ops;
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info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE;
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info->screen_base = devm_ioremap(&pdev->dev, info->fix.smem_start,
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info->fix.smem_len);
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if (!info->screen_base) {
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framebuffer_release(info);
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return -ENODEV;
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}
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info->pseudo_palette = (void *)(info + 1);
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ret = register_framebuffer(info);
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if (ret < 0) {
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dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret);
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framebuffer_release(info);
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return ret;
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}
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dev_info(&pdev->dev, "fb%d: simplefb registered!\n", info->node);
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return 0;
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}
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static int simplefb_remove(struct platform_device *pdev)
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{
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struct fb_info *info = platform_get_drvdata(pdev);
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unregister_framebuffer(info);
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framebuffer_release(info);
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return 0;
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}
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static const struct of_device_id simplefb_of_match[] = {
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{ .compatible = "simple-framebuffer", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, simplefb_of_match);
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static struct platform_driver simplefb_driver = {
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.driver = {
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.name = "simple-framebuffer",
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.owner = THIS_MODULE,
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.of_match_table = simplefb_of_match,
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},
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.probe = simplefb_probe,
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.remove = simplefb_remove,
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};
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module_platform_driver(simplefb_driver);
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MODULE_AUTHOR("Stephen Warren <swarren@wwwdotorg.org>");
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MODULE_DESCRIPTION("Simple framebuffer driver");
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MODULE_LICENSE("GPL v2");
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