wmt_ge_rops.c

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/*
 *  linux/drivers/video/wmt_ge_rops.c
 *
 *  Accelerators for raster operations using WonderMedia Graphics Engine
 *
 *  Copyright (C) 2010 Alexey Charkov <[email protected]>
 *
 * 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\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 int __devexit wmt_ge_rops_remove(struct platform_device *pdev)
{
    iounmap(regbase);
    return 0;
}

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     = __devexit_p(wmt_ge_rops_remove),
    .driver     = {
        .owner  = THIS_MODULE,
        .name   = "wmt_ge_rops",
        .of_match_table = of_match_ptr(wmt_dt_ids),
    },
};

module_platform_driver(wmt_ge_rops_driver);

MODULE_AUTHOR("Alexey Charkov <[email protected]");
MODULE_DESCRIPTION("Accelerators for raster operations using "
           "WonderMedia Graphics Engine");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, wmt_dt_ids);