video/fbdev/wmt_ge_rops.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  linux/drivers/video/wmt_ge_rops.c
0004  *
0005  *  Accelerators for raster operations using WonderMedia Graphics Engine
0006  *
0007  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
0008  */
0009
0010 #include <linux/module.h>
0011 #include <linux/fb.h>
0012 #include <linux/platform_device.h>
0013 #include "core/fb_draw.h"
0014 #include "wmt_ge_rops.h"
0015
0016 #define GE_COMMAND_OFF      0x00
0017 #define GE_DEPTH_OFF        0x04
0018 #define GE_HIGHCOLOR_OFF    0x08
0019 #define GE_ROPCODE_OFF      0x14
0020 #define GE_FIRE_OFF     0x18
0021 #define GE_SRCBASE_OFF      0x20
0022 #define GE_SRCDISPW_OFF     0x24
0023 #define GE_SRCDISPH_OFF     0x28
0024 #define GE_SRCAREAX_OFF     0x2c
0025 #define GE_SRCAREAY_OFF     0x30
0026 #define GE_SRCAREAW_OFF     0x34
0027 #define GE_SRCAREAH_OFF     0x38
0028 #define GE_DESTBASE_OFF     0x3c
0029 #define GE_DESTDISPW_OFF    0x40
0030 #define GE_DESTDISPH_OFF    0x44
0031 #define GE_DESTAREAX_OFF    0x48
0032 #define GE_DESTAREAY_OFF    0x4c
0033 #define GE_DESTAREAW_OFF    0x50
0034 #define GE_DESTAREAH_OFF    0x54
0035 #define GE_PAT0C_OFF        0x88    /* Pattern 0 color */
0036 #define GE_ENABLE_OFF       0xec
0037 #define GE_INTEN_OFF        0xf0
0038 #define GE_STATUS_OFF       0xf8
0039
0040 static void __iomem *regbase;
0041
0042 void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
0043 {
0044     unsigned long fg, pat;
0045
0046     if (p->state != FBINFO_STATE_RUNNING)
0047         return;
0048
0049     if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
0050         p->fix.visual == FB_VISUAL_DIRECTCOLOR)
0051         fg = ((u32 *) (p->pseudo_palette))[rect->color];
0052     else
0053         fg = rect->color;
0054
0055     pat = pixel_to_pat(p->var.bits_per_pixel, fg);
0056
0057     if (p->fbops->fb_sync)
0058         p->fbops->fb_sync(p);
0059
0060     writel(p->var.bits_per_pixel == 32 ? 3 :
0061           (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
0062     writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
0063     writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
0064     writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
0065     writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
0066     writel(rect->dx, regbase + GE_DESTAREAX_OFF);
0067     writel(rect->dy, regbase + GE_DESTAREAY_OFF);
0068     writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
0069     writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
0070
0071     writel(pat, regbase + GE_PAT0C_OFF);
0072     writel(1, regbase + GE_COMMAND_OFF);
0073     writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
0074     writel(1, regbase + GE_FIRE_OFF);
0075 }
0076 EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
0077
0078 void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
0079 {
0080     if (p->state != FBINFO_STATE_RUNNING)
0081         return;
0082
0083     if (p->fbops->fb_sync)
0084         p->fbops->fb_sync(p);
0085
0086     writel(p->var.bits_per_pixel > 16 ? 3 :
0087           (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
0088
0089     writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
0090     writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
0091     writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
0092     writel(area->sx, regbase + GE_SRCAREAX_OFF);
0093     writel(area->sy, regbase + GE_SRCAREAY_OFF);
0094     writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
0095     writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
0096
0097     writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
0098     writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
0099     writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
0100     writel(area->dx, regbase + GE_DESTAREAX_OFF);
0101     writel(area->dy, regbase + GE_DESTAREAY_OFF);
0102     writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
0103     writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
0104
0105     writel(0xcc, regbase + GE_ROPCODE_OFF);
0106     writel(1, regbase + GE_COMMAND_OFF);
0107     writel(1, regbase + GE_FIRE_OFF);
0108 }
0109 EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
0110
0111 int wmt_ge_sync(struct fb_info *p)
0112 {
0113     int loops = 5000000;
0114     while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
0115         cpu_relax();
0116     return loops > 0 ? 0 : -EBUSY;
0117 }
0118 EXPORT_SYMBOL_GPL(wmt_ge_sync);
0119
0120 static int wmt_ge_rops_probe(struct platform_device *pdev)
0121 {
0122     struct resource *res;
0123
0124     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0125     if (res == NULL) {
0126         dev_err(&pdev->dev, "no I/O memory resource defined\n");
0127         return -ENODEV;
0128     }
0129
0130     /* Only one ROP engine is presently supported. */
0131     if (unlikely(regbase)) {
0132         WARN_ON(1);
0133         return -EBUSY;
0134     }
0135
0136     regbase = ioremap(res->start, resource_size(res));
0137     if (regbase == NULL) {
0138         dev_err(&pdev->dev, "failed to map I/O memory\n");
0139         return -EBUSY;
0140     }
0141
0142     writel(1, regbase + GE_ENABLE_OFF);
0143     printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
0144
0145     return 0;
0146 }
0147
0148 static int wmt_ge_rops_remove(struct platform_device *pdev)
0149 {
0150     iounmap(regbase);
0151     return 0;
0152 }
0153
0154 static const struct of_device_id wmt_dt_ids[] = {
0155     { .compatible = "wm,prizm-ge-rops", },
0156     { /* sentinel */ }
0157 };
0158
0159 static struct platform_driver wmt_ge_rops_driver = {
0160     .probe      = wmt_ge_rops_probe,
0161     .remove     = wmt_ge_rops_remove,
0162     .driver     = {
0163         .name   = "wmt_ge_rops",
0164         .of_match_table = wmt_dt_ids,
0165     },
0166 };
0167
0168 module_platform_driver(wmt_ge_rops_driver);
0169
0170 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
0171 MODULE_DESCRIPTION("Accelerators for raster operations using "
0172            "WonderMedia Graphics Engine");
0173 MODULE_LICENSE("GPL v2");
0174 MODULE_DEVICE_TABLE(of, wmt_dt_ids);