drivers/video/wmt_ge_rops.c

   1 /*
   2  *  linux/drivers/video/wmt_ge_rops.c
   3  *
   4  *  Accelerators for raster operations using WonderMedia Graphics Engine
   5  *
   6  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/fb.h>
  20 #include <linux/platform_device.h>
  21 #include "fb_draw.h"
  22
  23 #define GE_COMMAND_OFF          0x00
  24 #define GE_DEPTH_OFF            0x04
  25 #define GE_HIGHCOLOR_OFF        0x08
  26 #define GE_ROPCODE_OFF          0x14
  27 #define GE_FIRE_OFF             0x18
  28 #define GE_SRCBASE_OFF          0x20
  29 #define GE_SRCDISPW_OFF         0x24
  30 #define GE_SRCDISPH_OFF         0x28
  31 #define GE_SRCAREAX_OFF         0x2c
  32 #define GE_SRCAREAY_OFF         0x30
  33 #define GE_SRCAREAW_OFF         0x34
  34 #define GE_SRCAREAH_OFF         0x38
  35 #define GE_DESTBASE_OFF         0x3c
  36 #define GE_DESTDISPW_OFF        0x40
  37 #define GE_DESTDISPH_OFF        0x44
  38 #define GE_DESTAREAX_OFF        0x48
  39 #define GE_DESTAREAY_OFF        0x4c
  40 #define GE_DESTAREAW_OFF        0x50
  41 #define GE_DESTAREAH_OFF        0x54
  42 #define GE_PAT0C_OFF            0x88    /* Pattern 0 color */
  43 #define GE_ENABLE_OFF           0xec
  44 #define GE_INTEN_OFF            0xf0
  45 #define GE_STATUS_OFF           0xf8
  46
  47 static void __iomem *regbase;
  48
  49 void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
  50 {
  51         unsigned long fg, pat;
  52
  53         if (p->state != FBINFO_STATE_RUNNING)
  54                 return;
  55
  56         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
  57             p->fix.visual == FB_VISUAL_DIRECTCOLOR)
  58                 fg = ((u32 *) (p->pseudo_palette))[rect->color];
  59         else
  60                 fg = rect->color;
  61
  62         pat = pixel_to_pat(p->var.bits_per_pixel, fg);
  63
  64         if (p->fbops->fb_sync)
  65                 p->fbops->fb_sync(p);
  66
  67         writel(p->var.bits_per_pixel == 32 ? 3 :
  68               (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
  69         writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
  70         writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
  71         writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
  72         writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
  73         writel(rect->dx, regbase + GE_DESTAREAX_OFF);
  74         writel(rect->dy, regbase + GE_DESTAREAY_OFF);
  75         writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
  76         writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
  77
  78         writel(pat, regbase + GE_PAT0C_OFF);
  79         writel(1, regbase + GE_COMMAND_OFF);
  80         writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
  81         writel(1, regbase + GE_FIRE_OFF);
  82 }
  83 EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
  84
  85 void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
  86 {
  87         if (p->state != FBINFO_STATE_RUNNING)
  88                 return;
  89
  90         if (p->fbops->fb_sync)
  91                 p->fbops->fb_sync(p);
  92
  93         writel(p->var.bits_per_pixel > 16 ? 3 :
  94               (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
  95
  96         writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
  97         writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
  98         writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
  99         writel(area->sx, regbase + GE_SRCAREAX_OFF);
 100         writel(area->sy, regbase + GE_SRCAREAY_OFF);
 101         writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
 102         writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
 103
 104         writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
 105         writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
 106         writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
 107         writel(area->dx, regbase + GE_DESTAREAX_OFF);
 108         writel(area->dy, regbase + GE_DESTAREAY_OFF);
 109         writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
 110         writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
 111
 112         writel(0xcc, regbase + GE_ROPCODE_OFF);
 113         writel(1, regbase + GE_COMMAND_OFF);
 114         writel(1, regbase + GE_FIRE_OFF);
 115 }
 116 EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
 117
 118 int wmt_ge_sync(struct fb_info *p)
 119 {
 120         int loops = 5000000;
 121         while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
 122                 cpu_relax();
 123         return loops > 0 ? 0 : -EBUSY;
 124 }
 125 EXPORT_SYMBOL_GPL(wmt_ge_sync);
 126
 127 static int wmt_ge_rops_probe(struct platform_device *pdev)
 128 {
 129         struct resource *res;
 130
 131         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 132         if (res == NULL) {
 133                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 134                 return -ENODEV;
 135         }
 136
 137         /* Only one ROP engine is presently supported. */
 138         if (unlikely(regbase)) {
 139                 WARN_ON(1);
 140                 return -EBUSY;
 141         }
 142
 143         regbase = ioremap(res->start, resource_size(res));
 144         if (regbase == NULL) {
 145                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 146                 return -EBUSY;
 147         }
 148
 149         writel(1, regbase + GE_ENABLE_OFF);
 150         printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
 151
 152         return 0;
 153 }
 154
 155 static int wmt_ge_rops_remove(struct platform_device *pdev)
 156 {
 157         iounmap(regbase);
 158         return 0;
 159 }
 160
 161 static const struct of_device_id wmt_dt_ids[] = {
 162         { .compatible = "wm,prizm-ge-rops", },
 163         { /* sentinel */ }
 164 };
 165
 166 static struct platform_driver wmt_ge_rops_driver = {
 167         .probe          = wmt_ge_rops_probe,
 168         .remove         = wmt_ge_rops_remove,
 169         .driver         = {
 170                 .owner  = THIS_MODULE,
 171                 .name   = "wmt_ge_rops",
 172                 .of_match_table = wmt_dt_ids,
 173         },
 174 };
 175
 176 module_platform_driver(wmt_ge_rops_driver);
 177
 178 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
 179 MODULE_DESCRIPTION("Accelerators for raster operations using "
 180                    "WonderMedia Graphics Engine");
 181 MODULE_LICENSE("GPL v2");
 182 MODULE_DEVICE_TABLE(of, wmt_dt_ids);