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/platform_device.h>
13 #include "core/fb_draw.h"
14 #include "wmt_ge_rops.h"
15 
16 #define GE_COMMAND_OFF		0x00
17 #define GE_DEPTH_OFF		0x04
18 #define GE_HIGHCOLOR_OFF	0x08
19 #define GE_ROPCODE_OFF		0x14
20 #define GE_FIRE_OFF		0x18
21 #define GE_SRCBASE_OFF		0x20
22 #define GE_SRCDISPW_OFF		0x24
23 #define GE_SRCDISPH_OFF		0x28
24 #define GE_SRCAREAX_OFF		0x2c
25 #define GE_SRCAREAY_OFF		0x30
26 #define GE_SRCAREAW_OFF		0x34
27 #define GE_SRCAREAH_OFF		0x38
28 #define GE_DESTBASE_OFF		0x3c
29 #define GE_DESTDISPW_OFF	0x40
30 #define GE_DESTDISPH_OFF	0x44
31 #define GE_DESTAREAX_OFF	0x48
32 #define GE_DESTAREAY_OFF	0x4c
33 #define GE_DESTAREAW_OFF	0x50
34 #define GE_DESTAREAH_OFF	0x54
35 #define GE_PAT0C_OFF		0x88	/* Pattern 0 color */
36 #define GE_ENABLE_OFF		0xec
37 #define GE_INTEN_OFF		0xf0
38 #define GE_STATUS_OFF		0xf8
39 
40 static void __iomem *regbase;
41 
wmt_ge_fillrect(struct fb_info * p,const struct fb_fillrect * rect)42 void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
43 {
44 	unsigned long fg, pat;
45 
46 	if (p->state != FBINFO_STATE_RUNNING)
47 		return;
48 
49 	if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
50 	    p->fix.visual == FB_VISUAL_DIRECTCOLOR)
51 		fg = ((u32 *) (p->pseudo_palette))[rect->color];
52 	else
53 		fg = rect->color;
54 
55 	pat = pixel_to_pat(p->var.bits_per_pixel, fg);
56 
57 	if (p->fbops->fb_sync)
58 		p->fbops->fb_sync(p);
59 
60 	writel(p->var.bits_per_pixel == 32 ? 3 :
61 	      (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
62 	writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
63 	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
64 	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
65 	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
66 	writel(rect->dx, regbase + GE_DESTAREAX_OFF);
67 	writel(rect->dy, regbase + GE_DESTAREAY_OFF);
68 	writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
69 	writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
70 
71 	writel(pat, regbase + GE_PAT0C_OFF);
72 	writel(1, regbase + GE_COMMAND_OFF);
73 	writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
74 	writel(1, regbase + GE_FIRE_OFF);
75 }
76 EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
77 
wmt_ge_copyarea(struct fb_info * p,const struct fb_copyarea * area)78 void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
79 {
80 	if (p->state != FBINFO_STATE_RUNNING)
81 		return;
82 
83 	if (p->fbops->fb_sync)
84 		p->fbops->fb_sync(p);
85 
86 	writel(p->var.bits_per_pixel > 16 ? 3 :
87 	      (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
88 
89 	writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
90 	writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
91 	writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
92 	writel(area->sx, regbase + GE_SRCAREAX_OFF);
93 	writel(area->sy, regbase + GE_SRCAREAY_OFF);
94 	writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
95 	writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
96 
97 	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
98 	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
99 	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
100 	writel(area->dx, regbase + GE_DESTAREAX_OFF);
101 	writel(area->dy, regbase + GE_DESTAREAY_OFF);
102 	writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
103 	writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
104 
105 	writel(0xcc, regbase + GE_ROPCODE_OFF);
106 	writel(1, regbase + GE_COMMAND_OFF);
107 	writel(1, regbase + GE_FIRE_OFF);
108 }
109 EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
110 
wmt_ge_sync(struct fb_info * p)111 int wmt_ge_sync(struct fb_info *p)
112 {
113 	int loops = 5000000;
114 	while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
115 		cpu_relax();
116 	return loops > 0 ? 0 : -EBUSY;
117 }
118 EXPORT_SYMBOL_GPL(wmt_ge_sync);
119 
wmt_ge_rops_probe(struct platform_device * pdev)120 static int wmt_ge_rops_probe(struct platform_device *pdev)
121 {
122 	struct resource *res;
123 
124 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
125 	if (res == NULL) {
126 		dev_err(&pdev->dev, "no I/O memory resource defined\n");
127 		return -ENODEV;
128 	}
129 
130 	/* Only one ROP engine is presently supported. */
131 	if (unlikely(regbase)) {
132 		WARN_ON(1);
133 		return -EBUSY;
134 	}
135 
136 	regbase = ioremap(res->start, resource_size(res));
137 	if (regbase == NULL) {
138 		dev_err(&pdev->dev, "failed to map I/O memory\n");
139 		return -EBUSY;
140 	}
141 
142 	writel(1, regbase + GE_ENABLE_OFF);
143 	printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
144 
145 	return 0;
146 }
147 
wmt_ge_rops_remove(struct platform_device * pdev)148 static int wmt_ge_rops_remove(struct platform_device *pdev)
149 {
150 	iounmap(regbase);
151 	return 0;
152 }
153 
154 static const struct of_device_id wmt_dt_ids[] = {
155 	{ .compatible = "wm,prizm-ge-rops", },
156 	{ /* sentinel */ }
157 };
158 
159 static struct platform_driver wmt_ge_rops_driver = {
160 	.probe		= wmt_ge_rops_probe,
161 	.remove		= wmt_ge_rops_remove,
162 	.driver		= {
163 		.name	= "wmt_ge_rops",
164 		.of_match_table = wmt_dt_ids,
165 	},
166 };
167 
168 module_platform_driver(wmt_ge_rops_driver);
169 
170 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
171 MODULE_DESCRIPTION("Accelerators for raster operations using "
172 		   "WonderMedia Graphics Engine");
173 MODULE_LICENSE("GPL v2");
174 MODULE_DEVICE_TABLE(of, wmt_dt_ids);
175