add initial drm_fb framebuffer

So far I can load fbcon, once I use my miniglx to add a framebuffer.
fbcon doesn't show anything on screen but baby steps and all that.

1 files changed, 160 insertions, 0 deletions

diff --git a/linux-core/drm_fb.c b/linux-core/drm_fb.c
new file mode 100644
index 00000000..9bf2187c
--- /dev/null
+++ b/linux-core/drm_fb.c
@@ -0,0 +1,160 @@
+    /*
+     *  Modularization
+     */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+
+#include "drmP.h"
+struct drmfb_par {
+	struct drm_device *dev;
+	struct drm_framebuffer *fb;
+};
+
+static int drmfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+			   unsigned blue, unsigned transp,
+			   struct fb_info *info)
+{
+	struct drmfb_par *par = info->par;
+	struct drm_framebuffer *fb = par->fb;
+	if (regno > 17)
+		return 1;
+
+	printk(KERN_INFO "Got set col reg %d %d %d %d\n", red, green, blue, regno);
+
+	if (regno < 16) {
+		switch (fb->depth) {
+		case 15:
+			fb->pseudo_palette[regno] = ((red & 0xf800) >>  1) |
+				((green & 0xf800) >>  6) |
+				((blue & 0xf800) >> 11);
+			break;
+		case 16:
+			fb->pseudo_palette[regno] = (red & 0xf800) |
+				((green & 0xfc00) >>  5) |
+				((blue  & 0xf800) >> 11);
+			break;
+		case 24:
+			fb->pseudo_palette[regno] = ((red & 0xff00) << 8) |
+				(green & 0xff00) |
+				((blue  & 0xff00) >> 8);
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static struct fb_ops drmfb_ops = {
+	.owner = THIS_MODULE,
+	//	.fb_open = drmfb_open,
+	//	.fb_read = drmfb_read,
+	//	.fb_write = drmfb_write,
+	//	.fb_release = drmfb_release,
+	//	.fb_ioctl = drmfb_ioctl,
+	.fb_setcolreg = drmfb_setcolreg,
+	.fb_fillrect = cfb_fillrect,
+	.fb_copyarea = cfb_copyarea,
+	.fb_imageblit = cfb_imageblit,
+};
+
+int drmfb_probe(struct drm_device *dev, struct drm_framebuffer *fb)
+{
+	struct fb_info *info;
+	struct drmfb_par *par;
+	struct device *device = &dev->pdev->dev; 
+	struct fb_var_screeninfo *var_info;
+	unsigned long base, size;
+
+	info = framebuffer_alloc(sizeof(struct drmfb_par), device);
+	if (!info){
+		return -EINVAL;
+	}
+
+	fb->fbdev = info;
+		
+	par = info->par;
+
+	par->dev = dev;
+	par->fb = fb;
+
+	info->fbops = &drmfb_ops;
+
+	strcpy(info->fix.id, "drmfb");
+	info->fix.smem_start = fb->offset + dev->mode_config.fb_base;
+	info->fix.smem_len = (8*1024*1024);
+	info->fix.type = FB_TYPE_PACKED_PIXELS;
+	info->fix.visual = FB_VISUAL_DIRECTCOLOR;
+	info->fix.type_aux = 0;
+	info->fix.mmio_start = 0;
+	info->fix.mmio_len = 0;
+	info->fix.line_length = fb->pitch;
+
+	info->flags = FBINFO_DEFAULT;
+
+	base = fb->bo->offset + dev->mode_config.fb_base;
+	size = (fb->bo->mem.num_pages * PAGE_SIZE);
+
+	DRM_DEBUG("remapping %08X %d\n", base, size);
+	fb->virtual_base = ioremap_nocache(base, size);
+
+	info->screen_base = fb->virtual_base;
+	info->screen_size = size;
+	info->pseudo_palette = fb->pseudo_palette;
+	info->var.xres = fb->width;
+	info->var.xres_virtual = fb->pitch;
+	info->var.yres = fb->height;
+	info->var.yres_virtual = fb->height;
+	info->var.bits_per_pixel = fb->bits_per_pixel;
+	info->var.xoffset = 0;
+	info->var.yoffset = 0;
+
+	switch(fb->depth) {
+	case 8:
+	case 15:
+	case 16:
+		break;
+	case 24:
+	case 32:
+		info->var.red.offset = 16;
+		info->var.green.offset = 8;
+		info->var.blue.offset = 0;
+		info->var.red.length = info->var.green.length =
+			info->var.blue.length = 8;
+		if (fb->depth == 32) {
+			info->var.transp.offset = 24;
+			info->var.transp.length = 8;
+		}
+		break;
+	}
+
+	if (register_framebuffer(info) < 0)
+		return -EINVAL;
+
+	printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
+	       info->fix.id);
+	return 0;
+}
+EXPORT_SYMBOL(drmfb_probe);
+
+int drmfb_remove(struct drm_device *dev, struct drm_framebuffer *fb)
+{
+	struct fb_info *info = fb->fbdev;
+	
+	if (info) {
+		iounmap(fb->virtual_base);
+		unregister_framebuffer(info);
+		framebuffer_release(info);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(drmfb_remove);
+MODULE_LICENSE("GPL");