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 
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 
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 
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 
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 
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_new	= 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