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
wmt_ge_fillrect(struct fb_info * p,const struct fb_fillrect * rect)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
wmt_ge_copyarea(struct fb_info * p,const struct fb_copyarea * area)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
wmt_ge_sync(struct fb_info * p)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
wmt_ge_rops_probe(struct platform_device * pdev)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
wmt_ge_rops_remove(struct platform_device * pdev)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);
175