/* cg6.c: CGSIX (GX, GXplus, TGX) frame buffer driver
   *

   * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)

   * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
   * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
   *
   * Driver layout based loosely on tgafb.c, see that file for credits.
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/errno.h>
  #include <linux/string.h>

  #include <linux/delay.h>
  #include <linux/init.h>
  #include <linux/fb.h>
  #include <linux/mm.h>

  #include <linux/of_device.h>

  
  #include <asm/io.h>

  #include <asm/fbio.h>
  
  #include "sbuslib.h"
  
  /*
   * Local functions.
   */
  
  static int cg6_setcolreg(unsigned, unsigned, unsigned, unsigned,
  			 unsigned, struct fb_info *);
  static int cg6_blank(int, struct fb_info *);
  
  static void cg6_imageblit(struct fb_info *, const struct fb_image *);
  static void cg6_fillrect(struct fb_info *, const struct fb_fillrect *);

  static void cg6_copyarea(struct fb_info *info, const struct fb_copyarea *area);

  static int cg6_sync(struct fb_info *);

  static int cg6_mmap(struct fb_info *, struct vm_area_struct *);

  static int cg6_ioctl(struct fb_info *, unsigned int, unsigned long);

  static int cg6_pan_display(struct fb_var_screeninfo *, struct fb_info *);

  
  /*
   *  Frame buffer operations
   */
  
  static struct fb_ops cg6_ops = {
  	.owner			= THIS_MODULE,
  	.fb_setcolreg		= cg6_setcolreg,
  	.fb_blank		= cg6_blank,

  	.fb_pan_display		= cg6_pan_display,

  	.fb_fillrect		= cg6_fillrect,

  	.fb_copyarea		= cg6_copyarea,

  	.fb_imageblit		= cg6_imageblit,
  	.fb_sync		= cg6_sync,
  	.fb_mmap		= cg6_mmap,
  	.fb_ioctl		= cg6_ioctl,

  #ifdef CONFIG_COMPAT
  	.fb_compat_ioctl	= sbusfb_compat_ioctl,
  #endif

  };
  
  /* Offset of interesting structures in the OBIO space */
  /*
   * Brooktree is the video dac and is funny to program on the cg6.
   * (it's even funnier on the cg3)
   * The FBC could be the frame buffer control
   * The FHC could is the frame buffer hardware control.
   */

  #define CG6_ROM_OFFSET			0x0UL
  #define CG6_BROOKTREE_OFFSET		0x200000UL
  #define CG6_DHC_OFFSET			0x240000UL
  #define CG6_ALT_OFFSET			0x280000UL
  #define CG6_FHC_OFFSET			0x300000UL
  #define CG6_THC_OFFSET			0x301000UL
  #define CG6_FBC_OFFSET			0x700000UL
  #define CG6_TEC_OFFSET			0x701000UL
  #define CG6_RAM_OFFSET			0x800000UL

  
  /* FHC definitions */

  #define CG6_FHC_FBID_SHIFT		24
  #define CG6_FHC_FBID_MASK		255
  #define CG6_FHC_REV_SHIFT		20
  #define CG6_FHC_REV_MASK		15
  #define CG6_FHC_FROP_DISABLE		(1 << 19)
  #define CG6_FHC_ROW_DISABLE		(1 << 18)
  #define CG6_FHC_SRC_DISABLE		(1 << 17)
  #define CG6_FHC_DST_DISABLE		(1 << 16)
  #define CG6_FHC_RESET			(1 << 15)
  #define CG6_FHC_LITTLE_ENDIAN		(1 << 13)
  #define CG6_FHC_RES_MASK		(3 << 11)
  #define CG6_FHC_1024			(0 << 11)
  #define CG6_FHC_1152			(1 << 11)
  #define CG6_FHC_1280			(2 << 11)
  #define CG6_FHC_1600			(3 << 11)
  #define CG6_FHC_CPU_MASK		(3 << 9)
  #define CG6_FHC_CPU_SPARC		(0 << 9)
  #define CG6_FHC_CPU_68020		(1 << 9)
  #define CG6_FHC_CPU_386			(2 << 9)
  #define CG6_FHC_TEST			(1 << 8)
  #define CG6_FHC_TEST_X_SHIFT		4
  #define CG6_FHC_TEST_X_MASK		15
  #define CG6_FHC_TEST_Y_SHIFT		0
  #define CG6_FHC_TEST_Y_MASK		15

  
  /* FBC mode definitions */
  #define CG6_FBC_BLIT_IGNORE		0x00000000
  #define CG6_FBC_BLIT_NOSRC		0x00100000
  #define CG6_FBC_BLIT_SRC		0x00200000
  #define CG6_FBC_BLIT_ILLEGAL		0x00300000
  #define CG6_FBC_BLIT_MASK		0x00300000
  
  #define CG6_FBC_VBLANK			0x00080000
  
  #define CG6_FBC_MODE_IGNORE		0x00000000
  #define CG6_FBC_MODE_COLOR8		0x00020000
  #define CG6_FBC_MODE_COLOR1		0x00040000
  #define CG6_FBC_MODE_HRMONO		0x00060000
  #define CG6_FBC_MODE_MASK		0x00060000
  
  #define CG6_FBC_DRAW_IGNORE		0x00000000
  #define CG6_FBC_DRAW_RENDER		0x00008000
  #define CG6_FBC_DRAW_PICK		0x00010000
  #define CG6_FBC_DRAW_ILLEGAL		0x00018000
  #define CG6_FBC_DRAW_MASK		0x00018000
  
  #define CG6_FBC_BWRITE0_IGNORE		0x00000000
  #define CG6_FBC_BWRITE0_ENABLE		0x00002000
  #define CG6_FBC_BWRITE0_DISABLE		0x00004000
  #define CG6_FBC_BWRITE0_ILLEGAL		0x00006000
  #define CG6_FBC_BWRITE0_MASK		0x00006000
  
  #define CG6_FBC_BWRITE1_IGNORE		0x00000000
  #define CG6_FBC_BWRITE1_ENABLE		0x00000800
  #define CG6_FBC_BWRITE1_DISABLE		0x00001000
  #define CG6_FBC_BWRITE1_ILLEGAL		0x00001800
  #define CG6_FBC_BWRITE1_MASK		0x00001800
  
  #define CG6_FBC_BREAD_IGNORE		0x00000000
  #define CG6_FBC_BREAD_0			0x00000200
  #define CG6_FBC_BREAD_1			0x00000400
  #define CG6_FBC_BREAD_ILLEGAL		0x00000600
  #define CG6_FBC_BREAD_MASK		0x00000600
  
  #define CG6_FBC_BDISP_IGNORE		0x00000000
  #define CG6_FBC_BDISP_0			0x00000080
  #define CG6_FBC_BDISP_1			0x00000100
  #define CG6_FBC_BDISP_ILLEGAL		0x00000180
  #define CG6_FBC_BDISP_MASK		0x00000180
  
  #define CG6_FBC_INDEX_MOD		0x00000040
  #define CG6_FBC_INDEX_MASK		0x00000030
  
  /* THC definitions */

  #define CG6_THC_MISC_REV_SHIFT		16
  #define CG6_THC_MISC_REV_MASK		15
  #define CG6_THC_MISC_RESET		(1 << 12)
  #define CG6_THC_MISC_VIDEO		(1 << 10)
  #define CG6_THC_MISC_SYNC		(1 << 9)
  #define CG6_THC_MISC_VSYNC		(1 << 8)
  #define CG6_THC_MISC_SYNC_ENAB		(1 << 7)
  #define CG6_THC_MISC_CURS_RES		(1 << 6)
  #define CG6_THC_MISC_INT_ENAB		(1 << 5)
  #define CG6_THC_MISC_INT		(1 << 4)
  #define CG6_THC_MISC_INIT		0x9f

  #define CG6_THC_CURSOFF			((65536-32) | ((65536-32) << 16))

  
  /* The contents are unknown */
  struct cg6_tec {

  	int tec_matrix;
  	int tec_clip;
  	int tec_vdc;

  };
  
  struct cg6_thc {

  	u32	thc_pad0[512];
  	u32	thc_hs;		/* hsync timing */
  	u32	thc_hsdvs;
  	u32	thc_hd;
  	u32	thc_vs;		/* vsync timing */
  	u32	thc_vd;
  	u32	thc_refresh;
  	u32	thc_misc;
  	u32	thc_pad1[56];
  	u32	thc_cursxy;	/* cursor x,y position (16 bits each) */
  	u32	thc_cursmask[32];	/* cursor mask bits */
  	u32	thc_cursbits[32];	/* what to show where mask enabled */

  };
  
  struct cg6_fbc {

  	u32	xxx0[1];
  	u32	mode;
  	u32	clip;

  	u32	xxx1[1];

  	u32	s;
  	u32	draw;
  	u32	blit;
  	u32	font;
  	u32	xxx2[24];
  	u32	x0, y0, z0, color0;
  	u32	x1, y1, z1, color1;
  	u32	x2, y2, z2, color2;
  	u32	x3, y3, z3, color3;
  	u32	offx, offy;
  	u32	xxx3[2];
  	u32	incx, incy;
  	u32	xxx4[2];
  	u32	clipminx, clipminy;
  	u32	xxx5[2];
  	u32	clipmaxx, clipmaxy;
  	u32	xxx6[2];
  	u32	fg;
  	u32	bg;
  	u32	alu;
  	u32	pm;
  	u32	pixelm;
  	u32	xxx7[2];
  	u32	patalign;
  	u32	pattern[8];
  	u32	xxx8[432];
  	u32	apointx, apointy, apointz;
  	u32	xxx9[1];
  	u32	rpointx, rpointy, rpointz;
  	u32	xxx10[5];
  	u32	pointr, pointg, pointb, pointa;
  	u32	alinex, aliney, alinez;
  	u32	xxx11[1];
  	u32	rlinex, rliney, rlinez;
  	u32	xxx12[5];
  	u32	liner, lineg, lineb, linea;
  	u32	atrix, atriy, atriz;
  	u32	xxx13[1];
  	u32	rtrix, rtriy, rtriz;
  	u32	xxx14[5];
  	u32	trir, trig, trib, tria;
  	u32	aquadx, aquady, aquadz;
  	u32	xxx15[1];
  	u32	rquadx, rquady, rquadz;
  	u32	xxx16[5];
  	u32	quadr, quadg, quadb, quada;
  	u32	arectx, arecty, arectz;
  	u32	xxx17[1];
  	u32	rrectx, rrecty, rrectz;
  	u32	xxx18[5];
  	u32	rectr, rectg, rectb, recta;

  };
  
  struct bt_regs {

  	u32	addr;
  	u32	color_map;
  	u32	control;
  	u32	cursor;

  };
  
  struct cg6_par {
  	spinlock_t		lock;
  	struct bt_regs		__iomem *bt;
  	struct cg6_fbc		__iomem *fbc;
  	struct cg6_thc		__iomem *thc;
  	struct cg6_tec		__iomem *tec;

  	u32			__iomem *fhc;

  
  	u32			flags;
  #define CG6_FLAG_BLANKED	0x00000001

  	unsigned long		which_io;

  };
  
  static int cg6_sync(struct fb_info *info)
  {

  	struct cg6_par *par = (struct cg6_par *)info->par;

  	struct cg6_fbc __iomem *fbc = par->fbc;
  	int limit = 10000;
  
  	do {
  		if (!(sbus_readl(&fbc->s) & 0x10000000))
  			break;
  		udelay(10);
  	} while (--limit > 0);
  
  	return 0;
  }

  static void cg6_switch_from_graph(struct cg6_par *par)
  {
  	struct cg6_thc __iomem *thc = par->thc;
  	unsigned long flags;
  
  	spin_lock_irqsave(&par->lock, flags);
  
  	/* Hide the cursor. */
  	sbus_writel(CG6_THC_CURSOFF, &thc->thc_cursxy);
  
  	spin_unlock_irqrestore(&par->lock, flags);
  }
  
  static int cg6_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
  {
  	struct cg6_par *par = (struct cg6_par *)info->par;
  
  	/* We just use this to catch switches out of
  	 * graphics mode.
  	 */
  	cg6_switch_from_graph(par);
  
  	if (var->xoffset || var->yoffset || var->vmode)
  		return -EINVAL;
  	return 0;
  }

  /**

   *	cg6_fillrect -	Draws a rectangle on the screen.

   *

   *	@info: frame buffer structure that represents a single frame buffer
   *	@rect: structure defining the rectagle and operation.

   */
  static void cg6_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
  {

  	struct cg6_par *par = (struct cg6_par *)info->par;

  	struct cg6_fbc __iomem *fbc = par->fbc;
  	unsigned long flags;
  	s32 val;

  	/* CG6 doesn't handle ROP_XOR */

  
  	spin_lock_irqsave(&par->lock, flags);

  	cg6_sync(info);

  	sbus_writel(rect->color, &fbc->fg);
  	sbus_writel(~(u32)0, &fbc->pixelm);
  	sbus_writel(0xea80ff00, &fbc->alu);
  	sbus_writel(0, &fbc->s);
  	sbus_writel(0, &fbc->clip);
  	sbus_writel(~(u32)0, &fbc->pm);
  	sbus_writel(rect->dy, &fbc->arecty);
  	sbus_writel(rect->dx, &fbc->arectx);
  	sbus_writel(rect->dy + rect->height, &fbc->arecty);
  	sbus_writel(rect->dx + rect->width, &fbc->arectx);
  	do {
  		val = sbus_readl(&fbc->draw);
  	} while (val < 0 && (val & 0x20000000));
  	spin_unlock_irqrestore(&par->lock, flags);
  }
  
  /**

   *	cg6_copyarea - Copies one area of the screen to another area.
   *
   *	@info: frame buffer structure that represents a single frame buffer
   *	@area: Structure providing the data to copy the framebuffer contents
   *		from one region to another.
   *
   *	This drawing operation copies a rectangular area from one area of the
   *	screen to another area.
   */
  static void cg6_copyarea(struct fb_info *info, const struct fb_copyarea *area)
  {
  	struct cg6_par *par = (struct cg6_par *)info->par;
  	struct cg6_fbc __iomem *fbc = par->fbc;
  	unsigned long flags;
  	int i;
  
  	spin_lock_irqsave(&par->lock, flags);
  
  	cg6_sync(info);
  
  	sbus_writel(0xff, &fbc->fg);
  	sbus_writel(0x00, &fbc->bg);
  	sbus_writel(~0, &fbc->pixelm);
  	sbus_writel(0xe880cccc, &fbc->alu);
  	sbus_writel(0, &fbc->s);
  	sbus_writel(0, &fbc->clip);
  
  	sbus_writel(area->sy, &fbc->y0);
  	sbus_writel(area->sx, &fbc->x0);
  	sbus_writel(area->sy + area->height - 1, &fbc->y1);
  	sbus_writel(area->sx + area->width - 1, &fbc->x1);
  	sbus_writel(area->dy, &fbc->y2);
  	sbus_writel(area->dx, &fbc->x2);
  	sbus_writel(area->dy + area->height - 1, &fbc->y3);
  	sbus_writel(area->dx + area->width - 1, &fbc->x3);
  	do {
  		i = sbus_readl(&fbc->blit);
  	} while (i < 0 && (i & 0x20000000));
  	spin_unlock_irqrestore(&par->lock, flags);
  }
  
  /**

   *	cg6_imageblit -	Copies a image from system memory to the screen.

   *

   *	@info: frame buffer structure that represents a single frame buffer
   *	@image: structure defining the image.

   */
  static void cg6_imageblit(struct fb_info *info, const struct fb_image *image)
  {

  	struct cg6_par *par = (struct cg6_par *)info->par;

  	struct cg6_fbc __iomem *fbc = par->fbc;
  	const u8 *data = image->data;
  	unsigned long flags;
  	u32 x, y;
  	int i, width;
  
  	if (image->depth > 1) {
  		cfb_imageblit(info, image);
  		return;
  	}
  
  	spin_lock_irqsave(&par->lock, flags);
  
  	cg6_sync(info);
  
  	sbus_writel(image->fg_color, &fbc->fg);
  	sbus_writel(image->bg_color, &fbc->bg);
  	sbus_writel(0x140000, &fbc->mode);
  	sbus_writel(0xe880fc30, &fbc->alu);
  	sbus_writel(~(u32)0, &fbc->pixelm);
  	sbus_writel(0, &fbc->s);
  	sbus_writel(0, &fbc->clip);
  	sbus_writel(0xff, &fbc->pm);
  	sbus_writel(32, &fbc->incx);
  	sbus_writel(0, &fbc->incy);
  
  	x = image->dx;
  	y = image->dy;
  	for (i = 0; i < image->height; i++) {
  		width = image->width;
  
  		while (width >= 32) {
  			u32 val;
  
  			sbus_writel(y, &fbc->y0);
  			sbus_writel(x, &fbc->x0);
  			sbus_writel(x + 32 - 1, &fbc->x1);

  			val = ((u32)data[0] << 24) |
  			      ((u32)data[1] << 16) |
  			      ((u32)data[2] <<  8) |
  			      ((u32)data[3] <<  0);
  			sbus_writel(val, &fbc->font);
  
  			data += 4;
  			x += 32;
  			width -= 32;
  		}
  		if (width) {
  			u32 val;
  
  			sbus_writel(y, &fbc->y0);
  			sbus_writel(x, &fbc->x0);
  			sbus_writel(x + width - 1, &fbc->x1);
  			if (width <= 8) {
  				val = (u32) data[0] << 24;
  				data += 1;
  			} else if (width <= 16) {
  				val = ((u32) data[0] << 24) |
  				      ((u32) data[1] << 16);
  				data += 2;
  			} else {
  				val = ((u32) data[0] << 24) |
  				      ((u32) data[1] << 16) |
  				      ((u32) data[2] <<  8);
  				data += 3;
  			}
  			sbus_writel(val, &fbc->font);
  		}
  
  		y += 1;
  		x = image->dx;
  	}
  
  	spin_unlock_irqrestore(&par->lock, flags);
  }
  
  /**

   *	cg6_setcolreg - Sets a color register.
   *
   *	@regno: boolean, 0 copy local, 1 get_user() function
   *	@red: frame buffer colormap structure
   *	@green: The green value which can be up to 16 bits wide
   *	@blue:  The blue value which can be up to 16 bits wide.
   *	@transp: If supported the alpha value which can be up to 16 bits wide.
   *	@info: frame buffer info structure

   */
  static int cg6_setcolreg(unsigned regno,
  			 unsigned red, unsigned green, unsigned blue,
  			 unsigned transp, struct fb_info *info)
  {

  	struct cg6_par *par = (struct cg6_par *)info->par;

  	struct bt_regs __iomem *bt = par->bt;
  	unsigned long flags;
  
  	if (regno >= 256)
  		return 1;
  
  	red >>= 8;
  	green >>= 8;
  	blue >>= 8;
  
  	spin_lock_irqsave(&par->lock, flags);
  
  	sbus_writel((u32)regno << 24, &bt->addr);
  	sbus_writel((u32)red << 24, &bt->color_map);
  	sbus_writel((u32)green << 24, &bt->color_map);
  	sbus_writel((u32)blue << 24, &bt->color_map);
  
  	spin_unlock_irqrestore(&par->lock, flags);
  
  	return 0;
  }
  
  /**

   *	cg6_blank - Blanks the display.
   *
   *	@blank_mode: the blank mode we want.
   *	@info: frame buffer structure that represents a single frame buffer

   */

  static int cg6_blank(int blank, struct fb_info *info)

  {

  	struct cg6_par *par = (struct cg6_par *)info->par;

  	struct cg6_thc __iomem *thc = par->thc;
  	unsigned long flags;
  	u32 val;
  
  	spin_lock_irqsave(&par->lock, flags);

  	val = sbus_readl(&thc->thc_misc);

  
  	switch (blank) {
  	case FB_BLANK_UNBLANK: /* Unblanking */

  		val |= CG6_THC_MISC_VIDEO;

  		par->flags &= ~CG6_FLAG_BLANKED;
  		break;
  
  	case FB_BLANK_NORMAL: /* Normal blanking */
  	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
  	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
  	case FB_BLANK_POWERDOWN: /* Poweroff */

  		val &= ~CG6_THC_MISC_VIDEO;

  		par->flags |= CG6_FLAG_BLANKED;
  		break;
  	}

  	sbus_writel(val, &thc->thc_misc);

  	spin_unlock_irqrestore(&par->lock, flags);
  
  	return 0;
  }
  
  static struct sbus_mmap_map cg6_mmap_map[] = {
  	{
  		.voff	= CG6_FBC,
  		.poff	= CG6_FBC_OFFSET,
  		.size	= PAGE_SIZE
  	},
  	{
  		.voff	= CG6_TEC,
  		.poff	= CG6_TEC_OFFSET,
  		.size	= PAGE_SIZE
  	},
  	{
  		.voff	= CG6_BTREGS,
  		.poff	= CG6_BROOKTREE_OFFSET,
  		.size	= PAGE_SIZE
  	},
  	{
  		.voff	= CG6_FHC,
  		.poff	= CG6_FHC_OFFSET,
  		.size	= PAGE_SIZE
  	},
  	{
  		.voff	= CG6_THC,
  		.poff	= CG6_THC_OFFSET,
  		.size	= PAGE_SIZE
  	},
  	{
  		.voff	= CG6_ROM,
  		.poff	= CG6_ROM_OFFSET,
  		.size	= 0x10000
  	},
  	{
  		.voff	= CG6_RAM,
  		.poff	= CG6_RAM_OFFSET,
  		.size	= SBUS_MMAP_FBSIZE(1)
  	},
  	{
  		.voff	= CG6_DHC,
  		.poff	= CG6_DHC_OFFSET,
  		.size	= 0x40000
  	},
  	{ .size	= 0 }
  };

  static int cg6_mmap(struct fb_info *info, struct vm_area_struct *vma)

  {
  	struct cg6_par *par = (struct cg6_par *)info->par;
  
  	return sbusfb_mmap_helper(cg6_mmap_map,

  				  info->fix.smem_start, info->fix.smem_len,

  				  par->which_io, vma);

  }

  static int cg6_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)

  {

  	return sbusfb_ioctl_helper(cmd, arg, info,

  				   FBTYPE_SUNFAST_COLOR, 8, info->fix.smem_len);

  }
  
  /*
   *  Initialisation
   */

  static void __devinit cg6_init_fix(struct fb_info *info, int linebytes)

  {
  	struct cg6_par *par = (struct cg6_par *)info->par;
  	const char *cg6_cpu_name, *cg6_card_name;
  	u32 conf;
  
  	conf = sbus_readl(par->fhc);

  	switch (conf & CG6_FHC_CPU_MASK) {

  	case CG6_FHC_CPU_SPARC:
  		cg6_cpu_name = "sparc";
  		break;
  	case CG6_FHC_CPU_68020:
  		cg6_cpu_name = "68020";
  		break;
  	default:
  		cg6_cpu_name = "i386";
  		break;
  	};
  	if (((conf >> CG6_FHC_REV_SHIFT) & CG6_FHC_REV_MASK) >= 11) {

  		if (info->fix.smem_len <= 0x100000)

  			cg6_card_name = "TGX";

  		else

  			cg6_card_name = "TGX+";

  	} else {

  		if (info->fix.smem_len <= 0x100000)

  			cg6_card_name = "GX";

  		else

  			cg6_card_name = "GX+";

  	}
  
  	sprintf(info->fix.id, "%s %s", cg6_card_name, cg6_cpu_name);

  	info->fix.id[sizeof(info->fix.id) - 1] = 0;

  
  	info->fix.type = FB_TYPE_PACKED_PIXELS;
  	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  
  	info->fix.line_length = linebytes;
  
  	info->fix.accel = FB_ACCEL_SUN_CGSIX;
  }
  
  /* Initialize Brooktree DAC */

  static void __devinit cg6_bt_init(struct cg6_par *par)

  {
  	struct bt_regs __iomem *bt = par->bt;

  	sbus_writel(0x04 << 24, &bt->addr);	 /* color planes */

  	sbus_writel(0xff << 24, &bt->control);
  	sbus_writel(0x05 << 24, &bt->addr);
  	sbus_writel(0x00 << 24, &bt->control);

  	sbus_writel(0x06 << 24, &bt->addr);	 /* overlay plane */

  	sbus_writel(0x73 << 24, &bt->control);
  	sbus_writel(0x07 << 24, &bt->addr);
  	sbus_writel(0x00 << 24, &bt->control);
  }

  static void __devinit cg6_chip_init(struct fb_info *info)

  {

  	struct cg6_par *par = (struct cg6_par *)info->par;

  	struct cg6_tec __iomem *tec = par->tec;
  	struct cg6_fbc __iomem *fbc = par->fbc;

  	struct cg6_thc __iomem *thc = par->thc;

  	u32 rev, conf, mode;

  	int i;

  	/* Hide the cursor. */
  	sbus_writel(CG6_THC_CURSOFF, &thc->thc_cursxy);

  	/* Turn off stuff in the Transform Engine. */
  	sbus_writel(0, &tec->tec_matrix);
  	sbus_writel(0, &tec->tec_clip);
  	sbus_writel(0, &tec->tec_vdc);
  
  	/* Take care of bugs in old revisions. */
  	rev = (sbus_readl(par->fhc) >> CG6_FHC_REV_SHIFT) & CG6_FHC_REV_MASK;
  	if (rev < 5) {
  		conf = (sbus_readl(par->fhc) & CG6_FHC_RES_MASK) |
  			CG6_FHC_CPU_68020 | CG6_FHC_TEST |
  			(11 << CG6_FHC_TEST_X_SHIFT) |
  			(11 << CG6_FHC_TEST_Y_SHIFT);
  		if (rev < 2)
  			conf |= CG6_FHC_DST_DISABLE;
  		sbus_writel(conf, par->fhc);
  	}
  
  	/* Set things in the FBC. Bad things appear to happen if we do
  	 * back to back store/loads on the mode register, so copy it
  	 * out instead. */
  	mode = sbus_readl(&fbc->mode);
  	do {
  		i = sbus_readl(&fbc->s);
  	} while (i & 0x10000000);
  	mode &= ~(CG6_FBC_BLIT_MASK | CG6_FBC_MODE_MASK |

  		  CG6_FBC_DRAW_MASK | CG6_FBC_BWRITE0_MASK |
  		  CG6_FBC_BWRITE1_MASK | CG6_FBC_BREAD_MASK |
  		  CG6_FBC_BDISP_MASK);

  	mode |= (CG6_FBC_BLIT_SRC | CG6_FBC_MODE_COLOR8 |

  		 CG6_FBC_DRAW_RENDER | CG6_FBC_BWRITE0_ENABLE |
  		 CG6_FBC_BWRITE1_DISABLE | CG6_FBC_BREAD_0 |
  		 CG6_FBC_BDISP_0);

  	sbus_writel(mode, &fbc->mode);
  
  	sbus_writel(0, &fbc->clip);
  	sbus_writel(0, &fbc->offx);
  	sbus_writel(0, &fbc->offy);
  	sbus_writel(0, &fbc->clipminx);
  	sbus_writel(0, &fbc->clipminy);
  	sbus_writel(info->var.xres - 1, &fbc->clipmaxx);
  	sbus_writel(info->var.yres - 1, &fbc->clipmaxy);

  }

  static void cg6_unmap_regs(struct platform_device *op, struct fb_info *info,

  			   struct cg6_par *par)

  {

  	if (par->fbc)
  		of_iounmap(&op->resource[0], par->fbc, 4096);
  	if (par->tec)
  		of_iounmap(&op->resource[0], par->tec, sizeof(struct cg6_tec));
  	if (par->thc)
  		of_iounmap(&op->resource[0], par->thc, sizeof(struct cg6_thc));
  	if (par->bt)
  		of_iounmap(&op->resource[0], par->bt, sizeof(struct bt_regs));
  	if (par->fhc)
  		of_iounmap(&op->resource[0], par->fhc, sizeof(u32));
  
  	if (info->screen_base)

  		of_iounmap(&op->resource[0], info->screen_base,
  			   info->fix.smem_len);

  }

  static int __devinit cg6_probe(struct platform_device *op)

  {

  	struct device_node *dp = op->dev.of_node;

  	struct fb_info *info;
  	struct cg6_par *par;

  	int linebytes, err;

  	int dblbuf;

  	info = framebuffer_alloc(sizeof(struct cg6_par), &op->dev);
  
  	err = -ENOMEM;
  	if (!info)
  		goto out_err;
  	par = info->par;

  	spin_lock_init(&par->lock);

  	info->fix.smem_start = op->resource[0].start;

  	par->which_io = op->resource[0].flags & IORESOURCE_BITS;

  	sbusfb_fill_var(&info->var, dp, 8);

  	info->var.red.length = 8;
  	info->var.green.length = 8;
  	info->var.blue.length = 8;

  	linebytes = of_getintprop_default(dp, "linebytes",

  					  info->var.xres);

  	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);

  
  	dblbuf = of_getintprop_default(dp, "dblbuf", 0);
  	if (dblbuf)

  		info->fix.smem_len *= 4;

  	par->fbc = of_ioremap(&op->resource[0], CG6_FBC_OFFSET,

  				4096, "cgsix fbc");

  	par->tec = of_ioremap(&op->resource[0], CG6_TEC_OFFSET,

  				sizeof(struct cg6_tec), "cgsix tec");

  	par->thc = of_ioremap(&op->resource[0], CG6_THC_OFFSET,

  				sizeof(struct cg6_thc), "cgsix thc");

  	par->bt = of_ioremap(&op->resource[0], CG6_BROOKTREE_OFFSET,

  				sizeof(struct bt_regs), "cgsix dac");

  	par->fhc = of_ioremap(&op->resource[0], CG6_FHC_OFFSET,

  				sizeof(u32), "cgsix fhc");

  	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_IMAGEBLIT |

  			FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT |
  			FBINFO_READS_FAST;

  	info->fbops = &cg6_ops;

  	info->screen_base = of_ioremap(&op->resource[0], CG6_RAM_OFFSET,

  					info->fix.smem_len, "cgsix ram");

  	if (!par->fbc || !par->tec || !par->thc ||
  	    !par->bt || !par->fhc || !info->screen_base)
  		goto out_unmap_regs;

  	info->var.accel_flags = FB_ACCELF_TEXT;

  	cg6_bt_init(par);
  	cg6_chip_init(info);

  	cg6_blank(FB_BLANK_UNBLANK, info);

  	if (fb_alloc_cmap(&info->cmap, 256, 0))
  		goto out_unmap_regs;

  	fb_set_cmap(&info->cmap, info);
  	cg6_init_fix(info, linebytes);

  	err = register_framebuffer(info);
  	if (err < 0)
  		goto out_dealloc_cmap;

  	dev_set_drvdata(&op->dev, info);

  	printk(KERN_INFO "%s: CGsix [%s] at %lx:%lx
  ",

  	       dp->full_name, info->fix.id,

  	       par->which_io, info->fix.smem_start);

  
  	return 0;

  out_dealloc_cmap:
  	fb_dealloc_cmap(&info->cmap);
  
  out_unmap_regs:
  	cg6_unmap_regs(op, info, par);

  	framebuffer_release(info);

  out_err:
  	return err;

  }

  static int __devexit cg6_remove(struct platform_device *op)

  {

  	struct fb_info *info = dev_get_drvdata(&op->dev);
  	struct cg6_par *par = info->par;

  	unregister_framebuffer(info);
  	fb_dealloc_cmap(&info->cmap);

  	cg6_unmap_regs(op, info, par);

  	framebuffer_release(info);

  	dev_set_drvdata(&op->dev, NULL);

  
  	return 0;
  }

  static const struct of_device_id cg6_match[] = {

  	{
  		.name = "cgsix",
  	},
  	{
  		.name = "cgthree+",
  	},
  	{},
  };
  MODULE_DEVICE_TABLE(of, cg6_match);

  static struct platform_driver cg6_driver = {

  	.driver = {
  		.name = "cg6",
  		.owner = THIS_MODULE,
  		.of_match_table = cg6_match,
  	},

  	.probe		= cg6_probe,
  	.remove		= __devexit_p(cg6_remove),
  };

  static int __init cg6_init(void)
  {
  	if (fb_get_options("cg6fb", NULL))
  		return -ENODEV;

  	return platform_driver_register(&cg6_driver);

  }

  static void __exit cg6_exit(void)

  {

  	platform_driver_unregister(&cg6_driver);

  }
  
  module_init(cg6_init);

  module_exit(cg6_exit);

  
  MODULE_DESCRIPTION("framebuffer driver for CGsix chipsets");

  MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
  MODULE_VERSION("2.0");

  MODULE_LICENSE("GPL");