drivers/video/fbdev/wmt_ge_rops.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/video/wmt_ge_rops.c
   4  *
   5  *  Accelerators for raster operations using WonderMedia Graphics Engine
   6  *
   7  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/fb.h>
  12 #include <linux/io.h>
  13 #include <linux/platform_device.h>
  14
  15 #include "core/fb_draw.h"
  16 #include "wmt_ge_rops.h"
  17
  18 #define GE_COMMAND_OFF          0x00
  19 #define GE_DEPTH_OFF            0x04
  20 #define GE_HIGHCOLOR_OFF        0x08
  21 #define GE_ROPCODE_OFF          0x14
  22 #define GE_FIRE_OFF             0x18
  23 #define GE_SRCBASE_OFF          0x20
  24 #define GE_SRCDISPW_OFF         0x24
  25 #define GE_SRCDISPH_OFF         0x28
  26 #define GE_SRCAREAX_OFF         0x2c
  27 #define GE_SRCAREAY_OFF         0x30
  28 #define GE_SRCAREAW_OFF         0x34
  29 #define GE_SRCAREAH_OFF         0x38
  30 #define GE_DESTBASE_OFF         0x3c
  31 #define GE_DESTDISPW_OFF        0x40
  32 #define GE_DESTDISPH_OFF        0x44
  33 #define GE_DESTAREAX_OFF        0x48
  34 #define GE_DESTAREAY_OFF        0x4c
  35 #define GE_DESTAREAW_OFF        0x50
  36 #define GE_DESTAREAH_OFF        0x54
  37 #define GE_PAT0C_OFF            0x88    /* Pattern 0 color */
  38 #define GE_ENABLE_OFF           0xec
  39 #define GE_INTEN_OFF            0xf0
  40 #define GE_STATUS_OFF           0xf8
  41
  42 static void __iomem *regbase;
  43
  44 void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
  45 {
  46         unsigned long fg, pat;
  47
  48         if (p->state != FBINFO_STATE_RUNNING)
  49                 return;
  50
  51         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
  52             p->fix.visual == FB_VISUAL_DIRECTCOLOR)
  53                 fg = ((u32 *) (p->pseudo_palette))[rect->color];
  54         else
  55                 fg = rect->color;
  56
  57         pat = pixel_to_pat(p->var.bits_per_pixel, fg);
  58
  59         if (p->fbops->fb_sync)
  60                 p->fbops->fb_sync(p);
  61
  62         writel(p->var.bits_per_pixel == 32 ? 3 :
  63               (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
  64         writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
  65         writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
  66         writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
  67         writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
  68         writel(rect->dx, regbase + GE_DESTAREAX_OFF);
  69         writel(rect->dy, regbase + GE_DESTAREAY_OFF);
  70         writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
  71         writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
  72
  73         writel(pat, regbase + GE_PAT0C_OFF);
  74         writel(1, regbase + GE_COMMAND_OFF);
  75         writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
  76         writel(1, regbase + GE_FIRE_OFF);
  77 }
  78 EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
  79
  80 void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
  81 {
  82         if (p->state != FBINFO_STATE_RUNNING)
  83                 return;
  84
  85         if (p->fbops->fb_sync)
  86                 p->fbops->fb_sync(p);
  87
  88         writel(p->var.bits_per_pixel > 16 ? 3 :
  89               (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
  90
  91         writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
  92         writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
  93         writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
  94         writel(area->sx, regbase + GE_SRCAREAX_OFF);
  95         writel(area->sy, regbase + GE_SRCAREAY_OFF);
  96         writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
  97         writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
  98
  99         writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
 100         writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
 101         writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
 102         writel(area->dx, regbase + GE_DESTAREAX_OFF);
 103         writel(area->dy, regbase + GE_DESTAREAY_OFF);
 104         writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
 105         writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
 106
 107         writel(0xcc, regbase + GE_ROPCODE_OFF);
 108         writel(1, regbase + GE_COMMAND_OFF);
 109         writel(1, regbase + GE_FIRE_OFF);
 110 }
 111 EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
 112
 113 int wmt_ge_sync(struct fb_info *p)
 114 {
 115         int loops = 5000000;
 116         while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
 117                 cpu_relax();
 118         return loops > 0 ? 0 : -EBUSY;
 119 }
 120 EXPORT_SYMBOL_GPL(wmt_ge_sync);
 121
 122 static int wmt_ge_rops_probe(struct platform_device *pdev)
 123 {
 124         struct resource *res;
 125
 126         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 127         if (res == NULL) {
 128                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 129                 return -ENODEV;
 130         }
 131
 132         /* Only one ROP engine is presently supported. */
 133         if (unlikely(regbase)) {
 134                 WARN_ON(1);
 135                 return -EBUSY;
 136         }
 137
 138         regbase = ioremap(res->start, resource_size(res));
 139         if (regbase == NULL) {
 140                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 141                 return -EBUSY;
 142         }
 143
 144         writel(1, regbase + GE_ENABLE_OFF);
 145         printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
 146
 147         return 0;
 148 }
 149
 150 static void wmt_ge_rops_remove(struct platform_device *pdev)
 151 {
 152         iounmap(regbase);
 153 }
 154
 155 static const struct of_device_id wmt_dt_ids[] = {
 156         { .compatible = "wm,prizm-ge-rops", },
 157         { /* sentinel */ }
 158 };
 159
 160 static struct platform_driver wmt_ge_rops_driver = {
 161         .probe          = wmt_ge_rops_probe,
 162         .remove         = wmt_ge_rops_remove,
 163         .driver         = {
 164                 .name   = "wmt_ge_rops",
 165                 .of_match_table = wmt_dt_ids,
 166         },
 167 };
 168
 169 module_platform_driver(wmt_ge_rops_driver);
 170
 171 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
 172 MODULE_DESCRIPTION("Accelerators for raster operations using "
 173                    "WonderMedia Graphics Engine");
 174 MODULE_DEVICE_TABLE(of, wmt_dt_ids);