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/export.h>
11 #include <linux/module.h>
12 #include <linux/fb.h>
13 #include <linux/io.h>
14 #include <linux/platform_device.h>
15
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 /* from the spec it seems more like depth than bits per pixel */
pixel_to_pat(u32 depth,u32 pixel,struct fb_info * p)45 static inline unsigned long pixel_to_pat(u32 depth, u32 pixel, struct fb_info *p)
46 {
47 switch (depth) {
48 case 1:
49 return ~0ul*pixel;
50 case 2:
51 return ~0ul/3*pixel;
52 case 4:
53 return ~0ul/15*pixel;
54 case 8:
55 return ~0ul/255*pixel;
56 case 12:
57 case 15:
58 case 16:
59 return ~0ul/0xffff*pixel;
60 case 18:
61 case 24:
62 return 0x1000001ul*pixel;
63 case 32:
64 return pixel;
65 default:
66 fb_warn_once(p, "%s: unsupported pixelformat %d\n", __func__, depth);
67 return 0;
68 }
69 }
70
wmt_ge_fillrect(struct fb_info * p,const struct fb_fillrect * rect)71 void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
72 {
73 unsigned long fg, pat;
74
75 if (p->state != FBINFO_STATE_RUNNING)
76 return;
77
78 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
79 p->fix.visual == FB_VISUAL_DIRECTCOLOR)
80 fg = ((u32 *) (p->pseudo_palette))[rect->color];
81 else
82 fg = rect->color;
83
84 pat = pixel_to_pat(p->var.bits_per_pixel, fg, p);
85
86 if (p->fbops->fb_sync)
87 p->fbops->fb_sync(p);
88
89 writel(p->var.bits_per_pixel == 32 ? 3 :
90 (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
91 writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
92 writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
93 writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
94 writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
95 writel(rect->dx, regbase + GE_DESTAREAX_OFF);
96 writel(rect->dy, regbase + GE_DESTAREAY_OFF);
97 writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
98 writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
99
100 writel(pat, regbase + GE_PAT0C_OFF);
101 writel(1, regbase + GE_COMMAND_OFF);
102 writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
103 writel(1, regbase + GE_FIRE_OFF);
104 }
105 EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
106
wmt_ge_copyarea(struct fb_info * p,const struct fb_copyarea * area)107 void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
108 {
109 if (p->state != FBINFO_STATE_RUNNING)
110 return;
111
112 if (p->fbops->fb_sync)
113 p->fbops->fb_sync(p);
114
115 writel(p->var.bits_per_pixel > 16 ? 3 :
116 (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
117
118 writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
119 writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
120 writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
121 writel(area->sx, regbase + GE_SRCAREAX_OFF);
122 writel(area->sy, regbase + GE_SRCAREAY_OFF);
123 writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
124 writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
125
126 writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
127 writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
128 writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
129 writel(area->dx, regbase + GE_DESTAREAX_OFF);
130 writel(area->dy, regbase + GE_DESTAREAY_OFF);
131 writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
132 writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
133
134 writel(0xcc, regbase + GE_ROPCODE_OFF);
135 writel(1, regbase + GE_COMMAND_OFF);
136 writel(1, regbase + GE_FIRE_OFF);
137 }
138 EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
139
wmt_ge_sync(struct fb_info * p)140 int wmt_ge_sync(struct fb_info *p)
141 {
142 int loops = 5000000;
143 while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
144 cpu_relax();
145 return loops > 0 ? 0 : -EBUSY;
146 }
147 EXPORT_SYMBOL_GPL(wmt_ge_sync);
148
wmt_ge_rops_probe(struct platform_device * pdev)149 static int wmt_ge_rops_probe(struct platform_device *pdev)
150 {
151 struct resource *res;
152
153 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
154 if (res == NULL) {
155 dev_err(&pdev->dev, "no I/O memory resource defined\n");
156 return -ENODEV;
157 }
158
159 /* Only one ROP engine is presently supported. */
160 if (unlikely(regbase)) {
161 WARN_ON(1);
162 return -EBUSY;
163 }
164
165 regbase = ioremap(res->start, resource_size(res));
166 if (regbase == NULL) {
167 dev_err(&pdev->dev, "failed to map I/O memory\n");
168 return -EBUSY;
169 }
170
171 writel(1, regbase + GE_ENABLE_OFF);
172 printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
173
174 return 0;
175 }
176
wmt_ge_rops_remove(struct platform_device * pdev)177 static void wmt_ge_rops_remove(struct platform_device *pdev)
178 {
179 iounmap(regbase);
180 }
181
182 static const struct of_device_id wmt_dt_ids[] = {
183 { .compatible = "wm,prizm-ge-rops", },
184 { /* sentinel */ }
185 };
186
187 static struct platform_driver wmt_ge_rops_driver = {
188 .probe = wmt_ge_rops_probe,
189 .remove = wmt_ge_rops_remove,
190 .driver = {
191 .name = "wmt_ge_rops",
192 .of_match_table = wmt_dt_ids,
193 },
194 };
195
196 module_platform_driver(wmt_ge_rops_driver);
197
198 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
199 MODULE_DESCRIPTION("Accelerators for raster operations using "
200 "WonderMedia Graphics Engine");
201 MODULE_DEVICE_TABLE(of, wmt_dt_ids);
202