drivers/video/fbdev/geode/gxfb_core.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Geode GX framebuffer driver.
  *
  *   Copyright (C) 2006 Arcom Control Systems Ltd.
  *
  * 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/delay.h>
 #include <linux/fb.h>
 #include <linux/console.h>
 #include <linux/suspend.h>
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/cs5535.h>

 #include <asm/olpc.h>

 #include "gxfb.h"

 static char *mode_option;
 static int vram;
 static int vt_switch;

 /* Modes relevant to the GX (taken from modedb.c) */
 static struct fb_videomode 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 struct fb_videomode gx_dcon_modedb[] = {
 	/* The only mode the DCON has is 1200x900 */
 	{ NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 	  FB_VMODE_NONINTERLACED, 0 }
 };

 static void get_modedb(struct fb_videomode **modedb, unsigned int *size)
 {
 	if (olpc_has_dcon()) {
 		*modedb = (struct fb_videomode *) gx_dcon_modedb;
 		*size = ARRAY_SIZE(gx_dcon_modedb);
 	} else {
 		*modedb = (struct fb_videomode *) gx_modedb;
 		*size = ARRAY_SIZE(gx_modedb);
 	}
 }

 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)
 {
 	if (info->var.bits_per_pixel > 8)
 		info->fix.visual = FB_VISUAL_TRUECOLOR;
 	else
 		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

 	info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);

 	gx_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)
 {
 	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;

 		gx_set_hw_palette_reg(info, regno, red, green, blue);
 	}

 	return 0;
 }

 static int gxfb_blank(int blank_mode, struct fb_info *info)
 {
 	return gx_blank_display(info, blank_mode);
 }

 static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 {
 	struct gxfb_par *par = info->par;
 	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 = pci_ioremap_bar(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 = pci_ioremap_bar(dev, 2);
 	if (!par->dc_regs)
 		return -ENOMEM;

 	ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
 	if (ret < 0)
 		return ret;
 	par->gp_regs = pci_ioremap_bar(dev, 1);

 	if (!par->gp_regs)
 		return -ENOMEM;

 	ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
 	if (ret < 0)
 		return ret;

 	info->fix.smem_start = pci_resource_start(dev, 0);
 	info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
 	info->screen_base = ioremap_wc(info->fix.smem_start,
 				       info->fix.smem_len);
 	if (!info->screen_base)
 		return -ENOMEM;

 	/* Set the 16MiB aligned base address of the graphics memory region
 	 * in the display controller */

 	write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);

 	dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
 		 info->fix.smem_len / 1024, info->fix.smem_start);

 	return 0;
 }

 static const 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 *gxfb_init_fbinfo(struct device *dev)
 {
 	struct gxfb_par *par;
 	struct fb_info *info;

 	/* Alloc enough space for the pseudo palette. */
 	info = framebuffer_alloc(sizeof(struct gxfb_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 gxfb_par);

 	info->var.grayscale	= 0;

 	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 		framebuffer_release(info);
 		return NULL;
 	}

 	return info;
 }

 static int __maybe_unused gxfb_suspend(struct device *dev)
 {
 	struct fb_info *info = dev_get_drvdata(dev);

 	console_lock();
 	gx_powerdown(info);
 	fb_set_suspend(info, 1);
 	console_unlock();

 	/* there's no point in setting PCI states; we emulate PCI, so
 	 * we don't end up getting power savings anyways */

 	return 0;
 }

 static int __maybe_unused gxfb_resume(struct device *dev)
 {
 	struct fb_info *info = dev_get_drvdata(dev);
 	int ret;

 	console_lock();
 	ret = gx_powerup(info);
 	if (ret) {
 		printk(KERN_ERR "gxfb:  power up failed!\n");
 		return ret;
 	}

 	fb_set_suspend(info, 0);
 	console_unlock();
 	return 0;
 }

 static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct gxfb_par *par;
 	struct fb_info *info;
 	int ret;
 	unsigned long val;

 	struct fb_videomode *modedb_ptr;
 	unsigned int modedb_size;

 	info = gxfb_init_fbinfo(&pdev->dev);
 	if (!info)
 		return -ENOMEM;
 	par = info->par;

 	if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
 		dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
 		goto err;
 	}

 	/* Figure out if this is a TFT or CRT part */

 	rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);

 	if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
 		par->enable_crt = 0;
 	else
 		par->enable_crt = 1;

 	get_modedb(&modedb_ptr, &modedb_size);
 	ret = fb_find_mode(&info->var, info, mode_option,
 			   modedb_ptr, modedb_size, 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);

 	pm_set_vt_switch(vt_switch);

 	if (register_framebuffer(info) < 0) {
 		ret = -EINVAL;
 		goto err;
 	}
 	pci_set_drvdata(pdev, info);
 	fb_info(info, "%s frame buffer device\n", 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);
 	}
 	if (par->gp_regs) {
 		iounmap(par->gp_regs);
 		pci_release_region(pdev, 1);
 	}

 	fb_dealloc_cmap(&info->cmap);
 	framebuffer_release(info);
 	return ret;
 }

 static void gxfb_remove(struct pci_dev *pdev)
 {
 	struct fb_info *info = pci_get_drvdata(pdev);
 	struct gxfb_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);

 	iounmap(par->gp_regs);
 	pci_release_region(pdev, 1);

 	fb_dealloc_cmap(&info->cmap);

 	framebuffer_release(info);
 }

 static const struct pci_device_id gxfb_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
 	{ 0, }
 };

 MODULE_DEVICE_TABLE(pci, gxfb_id_table);

 static const struct dev_pm_ops gxfb_pm_ops = {
 #ifdef CONFIG_PM_SLEEP
 	.suspend	= gxfb_suspend,
 	.resume		= gxfb_resume,
 	.freeze		= NULL,
 	.thaw		= gxfb_resume,
 	.poweroff	= NULL,
 	.restore	= gxfb_resume,
 #endif
 };

 static struct pci_driver gxfb_driver = {
 	.name		= "gxfb",
 	.id_table	= gxfb_id_table,
 	.probe		= gxfb_probe,
 	.remove		= gxfb_remove,
 	.driver.pm	= &gxfb_pm_ops,
 };

 #ifndef MODULE
 static int __init gxfb_setup(char *options)
 {

 	char *opt;

 	if (!options || !*options)
 		return 0;

 	while ((opt = strsep(&options, ",")) != NULL) {
 		if (!*opt)
 			continue;

 		mode_option = opt;
 	}

 	return 0;
 }
 #endif

 static int __init gxfb_init(void)
 {
 #ifndef MODULE
 	char *option = NULL;

 	if (fb_get_options("gxfb", &option))
 		return -ENODEV;

 	gxfb_setup(option);
 #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(mode_option, charp, 0);
 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");

 module_param(vram, int, 0);
 MODULE_PARM_DESC(vram, "video memory size");

 module_param(vt_switch, int, 0);
 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");

 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Geode GX framebuffer driver.
	*
	* Copyright (C) 2006 Arcom Control Systems Ltd.
	*
	* 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/delay.h>
	#include <linux/fb.h>
	#include <linux/console.h>
	#include <linux/suspend.h>
	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/cs5535.h>

	#include <asm/olpc.h>

	#include "gxfb.h"

	static char *mode_option;
	static int vram;
	static int vt_switch;

	/* Modes relevant to the GX (taken from modedb.c) */
	static struct fb_videomode 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 struct fb_videomode gx_dcon_modedb[] = {
	/* The only mode the DCON has is 1200x900 */
	{ NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
	FB_SYNC_HOR_HIGH_ACT \| FB_SYNC_VERT_HIGH_ACT,
	FB_VMODE_NONINTERLACED, 0 }
	};

	static void get_modedb(struct fb_videomode *modedb, unsigned int size)
	{
	if (olpc_has_dcon()) {
	modedb = (struct fb_videomode ) gx_dcon_modedb;
	*size = ARRAY_SIZE(gx_dcon_modedb);
	} else {
	modedb = (struct fb_videomode ) gx_modedb;
	*size = ARRAY_SIZE(gx_modedb);
	}
	}

	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)
	{
	if (info->var.bits_per_pixel > 8)
	info->fix.visual = FB_VISUAL_TRUECOLOR;
	else
	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);

	gx_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)
	{
	if (info->var.grayscale) {
	/* grayscale = 0.30R + 0.59G + 0.11B /
	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;

	gx_set_hw_palette_reg(info, regno, red, green, blue);
	}

	return 0;
	}

	static int gxfb_blank(int blank_mode, struct fb_info *info)
	{
	return gx_blank_display(info, blank_mode);
	}

	static int gxfb_map_video_memory(struct fb_info info, struct pci_dev dev)
	{
	struct gxfb_par *par = info->par;
	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 = pci_ioremap_bar(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 = pci_ioremap_bar(dev, 2);
	if (!par->dc_regs)
	return -ENOMEM;

	ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
	if (ret < 0)
	return ret;
	par->gp_regs = pci_ioremap_bar(dev, 1);

	if (!par->gp_regs)
	return -ENOMEM;

	ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
	if (ret < 0)
	return ret;

	info->fix.smem_start = pci_resource_start(dev, 0);
	info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
	info->screen_base = ioremap_wc(info->fix.smem_start,
	info->fix.smem_len);
	if (!info->screen_base)
	return -ENOMEM;

	/* Set the 16MiB aligned base address of the graphics memory region
	* in the display controller */

	write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);

	dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
	info->fix.smem_len / 1024, info->fix.smem_start);

	return 0;
	}

	static const 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 gxfb_init_fbinfo(struct device dev)
	{
	struct gxfb_par *par;
	struct fb_info *info;

	/* Alloc enough space for the pseudo palette. */
	info = framebuffer_alloc(sizeof(struct gxfb_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 gxfb_par);

	info->var.grayscale = 0;

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
	framebuffer_release(info);
	return NULL;
	}

	return info;
	}

	static int __maybe_unused gxfb_suspend(struct device *dev)
	{
	struct fb_info *info = dev_get_drvdata(dev);

	console_lock();
	gx_powerdown(info);
	fb_set_suspend(info, 1);
	console_unlock();

	/* there's no point in setting PCI states; we emulate PCI, so
	* we don't end up getting power savings anyways */

	return 0;
	}

	static int __maybe_unused gxfb_resume(struct device *dev)
	{
	struct fb_info *info = dev_get_drvdata(dev);
	int ret;

	console_lock();
	ret = gx_powerup(info);
	if (ret) {
	printk(KERN_ERR "gxfb: power up failed!\n");
	return ret;
	}

	fb_set_suspend(info, 0);
	console_unlock();
	return 0;
	}

	static int gxfb_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	struct gxfb_par *par;
	struct fb_info *info;
	int ret;
	unsigned long val;

	struct fb_videomode *modedb_ptr;
	unsigned int modedb_size;

	info = gxfb_init_fbinfo(&pdev->dev);
	if (!info)
	return -ENOMEM;
	par = info->par;

	if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
	dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
	goto err;
	}

	/* Figure out if this is a TFT or CRT part */

	rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);

	if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
	par->enable_crt = 0;
	else
	par->enable_crt = 1;

	get_modedb(&modedb_ptr, &modedb_size);
	ret = fb_find_mode(&info->var, info, mode_option,
	modedb_ptr, modedb_size, 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);

	pm_set_vt_switch(vt_switch);

	if (register_framebuffer(info) < 0) {
	ret = -EINVAL;
	goto err;
	}
	pci_set_drvdata(pdev, info);
	fb_info(info, "%s frame buffer device\n", 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);
	}
	if (par->gp_regs) {
	iounmap(par->gp_regs);
	pci_release_region(pdev, 1);
	}

	fb_dealloc_cmap(&info->cmap);
	framebuffer_release(info);
	return ret;
	}

	static void gxfb_remove(struct pci_dev *pdev)
	{
	struct fb_info *info = pci_get_drvdata(pdev);
	struct gxfb_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);

	iounmap(par->gp_regs);
	pci_release_region(pdev, 1);

	fb_dealloc_cmap(&info->cmap);

	framebuffer_release(info);
	}

	static const struct pci_device_id gxfb_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
	{ 0, }
	};

	MODULE_DEVICE_TABLE(pci, gxfb_id_table);

	static const struct dev_pm_ops gxfb_pm_ops = {
	#ifdef CONFIG_PM_SLEEP
	.suspend = gxfb_suspend,
	.resume = gxfb_resume,
	.freeze = NULL,
	.thaw = gxfb_resume,
	.poweroff = NULL,
	.restore = gxfb_resume,
	#endif
	};

	static struct pci_driver gxfb_driver = {
	.name = "gxfb",
	.id_table = gxfb_id_table,
	.probe = gxfb_probe,
	.remove = gxfb_remove,
	.driver.pm = &gxfb_pm_ops,
	};

	#ifndef MODULE
	static int __init gxfb_setup(char *options)
	{

	char *opt;

	if (!options \|\| !*options)
	return 0;

	while ((opt = strsep(&options, ",")) != NULL) {
	if (!*opt)
	continue;

	mode_option = opt;
	}

	return 0;
	}
	#endif

	static int __init gxfb_init(void)
	{
	#ifndef MODULE
	char *option = NULL;

	if (fb_get_options("gxfb", &option))
	return -ENODEV;

	gxfb_setup(option);
	#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(mode_option, charp, 0);
	MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");

	module_param(vram, int, 0);
	MODULE_PARM_DESC(vram, "video memory size");

	module_param(vt_switch, int, 0);
	MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");

	MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
	MODULE_LICENSE("GPL");