[PATCH] fbdev: framebuffer driver for Geode GX

A framebuffer driver for the display controller in AMD Geode GX processors
(Geode GX533, Geode GX500 etc.).  Tested at 640x480, 800x600, 1024x768 and
1280x1024 at 8, 16, and 24 bpp with both CRT and TFT.  No accelerated features
currently implemented and compression remains disabled.

This driver requires that the BIOS (or the SoftVG/Firmbase code in the BIOS)
has created an appropriate virtual PCI header.

Signed-off-by: David Vrabel <dvrabel@arcom.com>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 423 insertions, 0 deletions

diff --git a/drivers/video/geode/gxfb_core.c b/drivers/video/geode/gxfb_core.c
new file mode 100644
index 0000000000000..89c34b15f5d4f
--- /dev/null
+++ b/drivers/video/geode/gxfb_core.c
@@ -0,0 +1,423 @@
+/*
+ * Geode GX framebuffer driver.
+ *
+ *   Copyright (C) 2006 Arcom Control Systems Ltd.
+ *
+ *   This program is free software; you can redistribute it and/or modify it
+ *   under the terms of the GNU General Public License as published by the
+ *   Free Software Foundation; either version 2 of the License, or (at your
+ *   option) any later version.
+ *
+ *
+ * This driver assumes that the BIOS has created a virtual PCI device header
+ * for the video device. The PCI header is assumed to contain the following
+ * BARs:
+ *
+ *    BAR0 - framebuffer memory
+ *    BAR1 - graphics processor registers
+ *    BAR2 - display controller registers
+ *    BAR3 - video processor and flat panel control registers.
+ *
+ * 16 MiB of framebuffer memory is assumed to be available.
+ */
+#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 <linux/pci.h>
+
+#include "geodefb.h"
+#include "display_gx.h"
+#include "video_gx.h"
+
+static char mode_option[32] = "640x480-16@60";
+
+/* Modes relevant to the GX (taken from modedb.c) */
+static const struct fb_videomode __initdata gx_modedb[] = {
+	/* 640x480-60 VESA */
+	{ NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
+	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 640x480-75 VESA */
+	{ NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
+	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 640x480-85 VESA */
+	{ NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
+	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 800x600-60 VESA */
+	{ NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 800x600-75 VESA */
+	{ NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 800x600-85 VESA */
+	{ NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1024x768-60 VESA */
+	{ NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
+	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1024x768-75 VESA */
+	{ NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1024x768-85 VESA */
+	{ NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1280x960-60 VESA */
+	{ NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1280x960-85 VESA */
+	{ NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1280x1024-60 VESA */
+	{ NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1280x1024-75 VESA */
+	{ NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1280x1024-85 VESA */
+	{ NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1600x1200-60 VESA */
+	{ NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1600x1200-75 VESA */
+	{ NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+	/* 1600x1200-85 VESA */
+	{ NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
+};
+
+static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	if (var->xres > 1600 || var->yres > 1200)
+		return -EINVAL;
+	if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
+		return -EINVAL;
+
+	if (var->bits_per_pixel == 32) {
+		var->red.offset   = 16; var->red.length   = 8;
+		var->green.offset =  8; var->green.length = 8;
+		var->blue.offset  =  0; var->blue.length  = 8;
+	} else if (var->bits_per_pixel == 16) {
+		var->red.offset   = 11; var->red.length   = 5;
+		var->green.offset =  5; var->green.length = 6;
+		var->blue.offset  =  0; var->blue.length  = 5;
+	} else if (var->bits_per_pixel == 8) {
+		var->red.offset   = 0; var->red.length   = 8;
+		var->green.offset = 0; var->green.length = 8;
+		var->blue.offset  = 0; var->blue.length  = 8;
+	} else
+		return -EINVAL;
+	var->transp.offset = 0; var->transp.length = 0;
+
+	/* Enough video memory? */
+	if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
+		return -EINVAL;
+
+	/* FIXME: Check timing parameters here? */
+
+	return 0;
+}
+
+static int gxfb_set_par(struct fb_info *info)
+{
+	struct geodefb_par *par = info->par;
+
+	if (info->var.bits_per_pixel > 8) {
+		info->fix.visual = FB_VISUAL_TRUECOLOR;
+		fb_dealloc_cmap(&info->cmap);
+	} else {
+		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+		fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
+	}
+
+	info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
+
+	par->dc_ops->set_mode(info);
+
+	return 0;
+}
+
+static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
+{
+	chan &= 0xffff;
+	chan >>= 16 - bf->length;
+	return chan << bf->offset;
+}
+
+static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+			   unsigned blue, unsigned transp,
+			   struct fb_info *info)
+{
+	struct geodefb_par *par = info->par;
+
+	if (info->var.grayscale) {
+		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
+		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
+	}
+
+	/* Truecolor has hardware independent palette */
+	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
+		u32 *pal = info->pseudo_palette;
+		u32 v;
+
+		if (regno >= 16)
+			return -EINVAL;
+
+		v  = chan_to_field(red, &info->var.red);
+		v |= chan_to_field(green, &info->var.green);
+		v |= chan_to_field(blue, &info->var.blue);
+
+		pal[regno] = v;
+	} else {
+		if (regno >= 256)
+			return -EINVAL;
+
+		par->dc_ops->set_palette_reg(info, regno, red, green, blue);
+	}
+
+	return 0;
+}
+
+static int gxfb_blank(int blank_mode, struct fb_info *info)
+{
+	struct geodefb_par *par = info->par;
+
+	return par->vid_ops->blank_display(info, blank_mode);
+}
+
+static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
+{
+	struct geodefb_par *par = info->par;
+	int fb_len;
+	int ret;
+
+	ret = pci_enable_device(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = pci_request_region(dev, 3, "gxfb (video processor)");
+	if (ret < 0)
+		return ret;
+	par->vid_regs = ioremap(pci_resource_start(dev, 3),
+				pci_resource_len(dev, 3));
+	if (!par->vid_regs)
+		return -ENOMEM;
+
+	ret = pci_request_region(dev, 2, "gxfb (display controller)");
+	if (ret < 0)
+		return ret;
+	par->dc_regs = ioremap(pci_resource_start(dev, 2), pci_resource_len(dev, 2));
+	if (!par->dc_regs)
+		return -ENOMEM;
+
+	ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
+	if (ret < 0)
+		return ret;
+	if ((fb_len = gx_frame_buffer_size()) < 0)
+		return -ENOMEM;
+	info->fix.smem_start = pci_resource_start(dev, 0);
+	info->fix.smem_len = fb_len;
+	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
+	if (!info->screen_base)
+		return -ENOMEM;
+
+	dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
+		 info->fix.smem_len / 1024, info->fix.smem_start);
+
+	return 0;
+}
+
+static struct fb_ops gxfb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_check_var	= gxfb_check_var,
+	.fb_set_par	= gxfb_set_par,
+	.fb_setcolreg	= gxfb_setcolreg,
+	.fb_blank       = gxfb_blank,
+	/* No HW acceleration for now. */
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+};
+
+static struct fb_info * __init gxfb_init_fbinfo(struct device *dev)
+{
+	struct geodefb_par *par;
+	struct fb_info *info;
+
+	/* Alloc enough space for the pseudo palette. */
+	info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev);
+	if (!info)
+		return NULL;
+
+	par = info->par;
+
+	strcpy(info->fix.id, "Geode GX");
+
+	info->fix.type		= FB_TYPE_PACKED_PIXELS;
+	info->fix.type_aux	= 0;
+	info->fix.xpanstep	= 0;
+	info->fix.ypanstep	= 0;
+	info->fix.ywrapstep	= 0;
+	info->fix.accel		= FB_ACCEL_NONE;
+
+	info->var.nonstd	= 0;
+	info->var.activate	= FB_ACTIVATE_NOW;
+	info->var.height	= -1;
+	info->var.width	= -1;
+	info->var.accel_flags = 0;
+	info->var.vmode	= FB_VMODE_NONINTERLACED;
+
+	info->fbops		= &gxfb_ops;
+	info->flags		= FBINFO_DEFAULT;
+	info->node		= -1;
+
+	info->pseudo_palette	= (void *)par + sizeof(struct geodefb_par);
+
+	info->var.grayscale	= 0;
+
+	return info;
+}
+
+static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct geodefb_par *par;
+	struct fb_info *info;
+	int ret;
+
+	info = gxfb_init_fbinfo(&pdev->dev);
+	if (!info)
+		return -ENOMEM;
+	par = info->par;
+
+	/* GX display controller and GX video device. */
+	par->dc_ops  = &gx_dc_ops;
+	par->vid_ops = &gx_vid_ops;
+
+	if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
+		dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
+		goto err;
+	}
+
+	ret = fb_find_mode(&info->var, info, mode_option,
+			   gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
+	if (ret == 0 || ret == 4) {
+		dev_err(&pdev->dev, "could not find valid video mode\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+        /* Clear the frame buffer of garbage. */
+        memset_io(info->screen_base, 0, info->fix.smem_len);
+
+	gxfb_check_var(&info->var, info);
+	gxfb_set_par(info);
+
+	if (register_framebuffer(info) < 0) {
+		ret = -EINVAL;
+		goto err;
+	}
+	pci_set_drvdata(pdev, info);
+	printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
+	return 0;
+
+  err:
+	if (info->screen_base) {
+		iounmap(info->screen_base);
+		pci_release_region(pdev, 0);
+	}
+	if (par->vid_regs) {
+		iounmap(par->vid_regs);
+		pci_release_region(pdev, 3);
+	}
+	if (par->dc_regs) {
+		iounmap(par->dc_regs);
+		pci_release_region(pdev, 2);
+	}
+
+	pci_disable_device(pdev);
+
+	if (info)
+		framebuffer_release(info);
+	return ret;
+}
+
+static void gxfb_remove(struct pci_dev *pdev)
+{
+	struct fb_info *info = pci_get_drvdata(pdev);
+	struct geodefb_par *par = info->par;
+
+	unregister_framebuffer(info);
+
+	iounmap((void __iomem *)info->screen_base);
+	pci_release_region(pdev, 0);
+
+	iounmap(par->vid_regs);
+	pci_release_region(pdev, 3);
+
+	iounmap(par->dc_regs);
+	pci_release_region(pdev, 2);
+
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+
+	framebuffer_release(info);
+}
+
+static struct pci_device_id gxfb_id_table[] = {
+	{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_VIDEO,
+	  PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
+	  0xff0000, 0 },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, gxfb_id_table);
+
+static struct pci_driver gxfb_driver = {
+	.name		= "gxfb",
+	.id_table	= gxfb_id_table,
+	.probe		= gxfb_probe,
+	.remove		= gxfb_remove,
+};
+
+static int __init gxfb_init(void)
+{
+#ifndef MODULE
+	if (fb_get_options("gxfb", NULL))
+		return -ENODEV;
+#endif
+	return pci_register_driver(&gxfb_driver);
+}
+
+static void __exit gxfb_cleanup(void)
+{
+	pci_unregister_driver(&gxfb_driver);
+}
+
+module_init(gxfb_init);
+module_exit(gxfb_cleanup);
+
+module_param_string(mode, mode_option, sizeof(mode_option), 0444);
+MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
+
+MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
+MODULE_LICENSE("GPL");