SSL wmt_ge_rops.c   Interaktion und
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// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/drivers/video/wmt_ge_rops.c
 *
 *  Accelerators for raster operations using WonderMedia Graphics Engine
 *
 *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
 */

#include <linux/export.h>
#include <linux/module.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/platform_device.h>

#include "wmt_ge_rops.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;

/* from the spec it seems more like depth than bits per pixel */
static inline unsigned long pixel_to_pat(u32 depth, u32 pixel, struct fb_info *p)
{
 switch (depth) {
 case 1:
  return ~0ul*pixel;
 case 2:
  return ~0ul/3*pixel;
 case 4:
  return ~0ul/15*pixel;
 case 8:
  return ~0ul/255*pixel;
 case 12:
 case 15:
 case 16:
  return ~0ul/0xffff*pixel;
 case 18:
 case 24:
  return 0x1000001ul*pixel;
 case 32:
  return pixel;
 default:
  fb_warn_once(p, "%s: unsupported pixelformat %d\n", __func__, depth);
  return 0;
 }
}

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, p);

 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 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\n");
  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\n");
  return -EBUSY;
 }

 writel(1, regbase + GE_ENABLE_OFF);
 printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");

 return 0;
}

static void wmt_ge_rops_remove(struct platform_device *pdev)
{
 iounmap(regbase);
}

static const struct of_device_id wmt_dt_ids[] = {
 { .compatible = "wm,prizm-ge-rops", },
 { /* sentinel */ }
};

static struct platform_driver wmt_ge_rops_driver = {
 .probe  = wmt_ge_rops_probe,
 .remove  = wmt_ge_rops_remove,
 .driver  = {
  .name = "wmt_ge_rops",
  .of_match_table = wmt_dt_ids,
 },
};

module_platform_driver(wmt_ge_rops_driver);

MODULE_AUTHOR("Alexey Charkov ");
MODULE_DESCRIPTION("Accelerators for raster operations using "
     "WonderMedia Graphics Engine");
MODULE_DEVICE_TABLE(of, wmt_dt_ids);