280 lines
6.9 KiB
C
280 lines
6.9 KiB
C
/*
|
|
* 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", ¶ms->width);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Can't parse width property\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "height", ¶ms->height);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Can't parse height property\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "stride", ¶ms->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, ¶ms);
|
|
else if (pdev->dev.of_node)
|
|
ret = simplefb_parse_dt(pdev, ¶ms);
|
|
|
|
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");
|