/*
   *  linux/drivers/video/wmt_ge_rops.c
   *
   *  Accelerators for raster operations using WonderMedia Graphics Engine
   *
   *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
   *
   * This software is licensed under the terms of the GNU General Public
   * License version 2, as published by the Free Software Foundation, and
   * may be copied, distributed, and modified under those terms.
   *
   * This program is distributed in the hope that 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/module.h>
  #include <linux/fb.h>
  #include <linux/platform_device.h>
  #include "fb_draw.h"
  
  #define GE_COMMAND_OFF		0x00
  #define GE_DEPTH_OFF		0x04
  #define GE_HIGHCOLOR_OFF	0x08
  #define GE_ROPCODE_OFF		0x14
  #define GE_FIRE_OFF		0x18
  #define GE_SRCBASE_OFF		0x20
  #define GE_SRCDISPW_OFF		0x24
  #define GE_SRCDISPH_OFF		0x28
  #define GE_SRCAREAX_OFF		0x2c
  #define GE_SRCAREAY_OFF		0x30
  #define GE_SRCAREAW_OFF		0x34
  #define GE_SRCAREAH_OFF		0x38
  #define GE_DESTBASE_OFF		0x3c
  #define GE_DESTDISPW_OFF	0x40
  #define GE_DESTDISPH_OFF	0x44
  #define GE_DESTAREAX_OFF	0x48
  #define GE_DESTAREAY_OFF	0x4c
  #define GE_DESTAREAW_OFF	0x50
  #define GE_DESTAREAH_OFF	0x54
  #define GE_PAT0C_OFF		0x88	/* Pattern 0 color */
  #define GE_ENABLE_OFF		0xec
  #define GE_INTEN_OFF		0xf0
  #define GE_STATUS_OFF		0xf8
  
  static void __iomem *regbase;
  
  void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
  {
  	unsigned long fg, pat;
  
  	if (p->state != FBINFO_STATE_RUNNING)
  		return;
  
  	if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
  	    p->fix.visual == FB_VISUAL_DIRECTCOLOR)
  		fg = ((u32 *) (p->pseudo_palette))[rect->color];
  	else
  		fg = rect->color;
  
  	pat = pixel_to_pat(p->var.bits_per_pixel, fg);
  
  	if (p->fbops->fb_sync)
  		p->fbops->fb_sync(p);
  
  	writel(p->var.bits_per_pixel == 32 ? 3 :
  	      (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
  	writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
  	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
  	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
  	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
  	writel(rect->dx, regbase + GE_DESTAREAX_OFF);
  	writel(rect->dy, regbase + GE_DESTAREAY_OFF);
  	writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
  	writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
  
  	writel(pat, regbase + GE_PAT0C_OFF);
  	writel(1, regbase + GE_COMMAND_OFF);
  	writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
  	writel(1, regbase + GE_FIRE_OFF);
  }
  EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
  
  void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
  {
  	if (p->state != FBINFO_STATE_RUNNING)
  		return;
  
  	if (p->fbops->fb_sync)
  		p->fbops->fb_sync(p);
  
  	writel(p->var.bits_per_pixel > 16 ? 3 :
  	      (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
  
  	writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
  	writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
  	writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
  	writel(area->sx, regbase + GE_SRCAREAX_OFF);
  	writel(area->sy, regbase + GE_SRCAREAY_OFF);
  	writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
  	writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
  
  	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
  	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
  	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
  	writel(area->dx, regbase + GE_DESTAREAX_OFF);
  	writel(area->dy, regbase + GE_DESTAREAY_OFF);
  	writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
  	writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
  
  	writel(0xcc, regbase + GE_ROPCODE_OFF);
  	writel(1, regbase + GE_COMMAND_OFF);
  	writel(1, regbase + GE_FIRE_OFF);
  }
  EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
  
  int wmt_ge_sync(struct fb_info *p)
  {
  	int loops = 5000000;
  	while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
  		cpu_relax();
  	return loops > 0 ? 0 : -EBUSY;
  }
  EXPORT_SYMBOL_GPL(wmt_ge_sync);
  
  static int __devinit wmt_ge_rops_probe(struct platform_device *pdev)
  {
  	struct resource *res;

  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	if (res == NULL) {
  		dev_err(&pdev->dev, "no I/O memory resource defined
  ");

  		return -ENODEV;

  	}
  
  	/* Only one ROP engine is presently supported. */
  	if (unlikely(regbase)) {
  		WARN_ON(1);
  		return -EBUSY;
  	}
  
  	regbase = ioremap(res->start, resource_size(res));
  	if (regbase == NULL) {
  		dev_err(&pdev->dev, "failed to map I/O memory
  ");

  		return -EBUSY;

  	}
  
  	writel(1, regbase + GE_ENABLE_OFF);
  	printk(KERN_INFO "Enabled support for WMT GE raster acceleration
  ");
  
  	return 0;

  }
  
  static int __devexit wmt_ge_rops_remove(struct platform_device *pdev)
  {
  	iounmap(regbase);
  	return 0;
  }
  
  static struct platform_driver wmt_ge_rops_driver = {
  	.probe		= wmt_ge_rops_probe,
  	.remove		= __devexit_p(wmt_ge_rops_remove),
  	.driver		= {
  		.owner	= THIS_MODULE,
  		.name	= "wmt_ge_rops",
  	},
  };

  module_platform_driver(wmt_ge_rops_driver);

  
  MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com");
  MODULE_DESCRIPTION("Accelerators for raster operations using "
  		   "WonderMedia Graphics Engine");
  MODULE_LICENSE("GPL");