tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 "wmt_ge_rops.h"
16
17#define GE_COMMAND_OFF 0x00
18#define GE_DEPTH_OFF 0x04
19#define GE_HIGHCOLOR_OFF 0x08
20#define GE_ROPCODE_OFF 0x14
21#define GE_FIRE_OFF 0x18
22#define GE_SRCBASE_OFF 0x20
23#define GE_SRCDISPW_OFF 0x24
24#define GE_SRCDISPH_OFF 0x28
25#define GE_SRCAREAX_OFF 0x2c
26#define GE_SRCAREAY_OFF 0x30
27#define GE_SRCAREAW_OFF 0x34
28#define GE_SRCAREAH_OFF 0x38
29#define GE_DESTBASE_OFF 0x3c
30#define GE_DESTDISPW_OFF 0x40
31#define GE_DESTDISPH_OFF 0x44
32#define GE_DESTAREAX_OFF 0x48
33#define GE_DESTAREAY_OFF 0x4c
34#define GE_DESTAREAW_OFF 0x50
35#define GE_DESTAREAH_OFF 0x54
36#define GE_PAT0C_OFF 0x88 /* Pattern 0 color */
37#define GE_ENABLE_OFF 0xec
38#define GE_INTEN_OFF 0xf0
39#define GE_STATUS_OFF 0xf8
40
41static void __iomem *regbase;
42
43/* from the spec it seems more like depth than bits per pixel */
44static inline unsigned long pixel_to_pat(u32 depth, u32 pixel, struct fb_info *p)
45{
46 switch (depth) {
47 case 1:
48 return ~0ul*pixel;
49 case 2:
50 return ~0ul/3*pixel;
51 case 4:
52 return ~0ul/15*pixel;
53 case 8:
54 return ~0ul/255*pixel;
55 case 12:
56 case 15:
57 case 16:
58 return ~0ul/0xffff*pixel;
59 case 18:
60 case 24:
61 return 0x1000001ul*pixel;
62 case 32:
63 return pixel;
64 default:
65 fb_warn_once(p, "%s: unsupported pixelformat %d\n", __func__, depth);
66 return 0;
67 }
68}
69
70void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
71{
72 unsigned long fg, pat;
73
74 if (p->state != FBINFO_STATE_RUNNING)
75 return;
76
77 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
78 p->fix.visual == FB_VISUAL_DIRECTCOLOR)
79 fg = ((u32 *) (p->pseudo_palette))[rect->color];
80 else
81 fg = rect->color;
82
83 pat = pixel_to_pat(p->var.bits_per_pixel, fg, p);
84
85 if (p->fbops->fb_sync)
86 p->fbops->fb_sync(p);
87
88 writel(p->var.bits_per_pixel == 32 ? 3 :
89 (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
90 writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
91 writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
92 writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
93 writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
94 writel(rect->dx, regbase + GE_DESTAREAX_OFF);
95 writel(rect->dy, regbase + GE_DESTAREAY_OFF);
96 writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
97 writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
98
99 writel(pat, regbase + GE_PAT0C_OFF);
100 writel(1, regbase + GE_COMMAND_OFF);
101 writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
102 writel(1, regbase + GE_FIRE_OFF);
103}
104EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
105
106void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
107{
108 if (p->state != FBINFO_STATE_RUNNING)
109 return;
110
111 if (p->fbops->fb_sync)
112 p->fbops->fb_sync(p);
113
114 writel(p->var.bits_per_pixel > 16 ? 3 :
115 (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
116
117 writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
118 writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
119 writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
120 writel(area->sx, regbase + GE_SRCAREAX_OFF);
121 writel(area->sy, regbase + GE_SRCAREAY_OFF);
122 writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
123 writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
124
125 writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
126 writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
127 writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
128 writel(area->dx, regbase + GE_DESTAREAX_OFF);
129 writel(area->dy, regbase + GE_DESTAREAY_OFF);
130 writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
131 writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
132
133 writel(0xcc, regbase + GE_ROPCODE_OFF);
134 writel(1, regbase + GE_COMMAND_OFF);
135 writel(1, regbase + GE_FIRE_OFF);
136}
137EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
138
139int wmt_ge_sync(struct fb_info *p)
140{
141 int loops = 5000000;
142 while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
143 cpu_relax();
144 return loops > 0 ? 0 : -EBUSY;
145}
146EXPORT_SYMBOL_GPL(wmt_ge_sync);
147
148static int wmt_ge_rops_probe(struct platform_device *pdev)
149{
150 struct resource *res;
151
152 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
153 if (res == NULL) {
154 dev_err(&pdev->dev, "no I/O memory resource defined\n");
155 return -ENODEV;
156 }
157
158 /* Only one ROP engine is presently supported. */
159 if (unlikely(regbase)) {
160 WARN_ON(1);
161 return -EBUSY;
162 }
163
164 regbase = ioremap(res->start, resource_size(res));
165 if (regbase == NULL) {
166 dev_err(&pdev->dev, "failed to map I/O memory\n");
167 return -EBUSY;
168 }
169
170 writel(1, regbase + GE_ENABLE_OFF);
171 printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
172
173 return 0;
174}
175
176static void wmt_ge_rops_remove(struct platform_device *pdev)
177{
178 iounmap(regbase);
179}
180
181static const struct of_device_id wmt_dt_ids[] = {
182 { .compatible = "wm,prizm-ge-rops", },
183 { /* sentinel */ }
184};
185
186static struct platform_driver wmt_ge_rops_driver = {
187 .probe = wmt_ge_rops_probe,
188 .remove = wmt_ge_rops_remove,
189 .driver = {
190 .name = "wmt_ge_rops",
191 .of_match_table = wmt_dt_ids,
192 },
193};
194
195module_platform_driver(wmt_ge_rops_driver);
196
197MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
198MODULE_DESCRIPTION("Accelerators for raster operations using "
199 "WonderMedia Graphics Engine");
200MODULE_DEVICE_TABLE(of, wmt_dt_ids);