1/*
2 *  linux/drivers/video/wmt_ge_rops.c
3 *
4 *  Accelerators for raster operations using WonderMedia Graphics Engine
5 *
6 *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
7 *
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/module.h>
19#include <linux/fb.h>
20#include <linux/platform_device.h>
21#include "core/fb_draw.h"
22
23#define GE_COMMAND_OFF		0x00
24#define GE_DEPTH_OFF		0x04
25#define GE_HIGHCOLOR_OFF	0x08
26#define GE_ROPCODE_OFF		0x14
27#define GE_FIRE_OFF		0x18
28#define GE_SRCBASE_OFF		0x20
29#define GE_SRCDISPW_OFF		0x24
30#define GE_SRCDISPH_OFF		0x28
31#define GE_SRCAREAX_OFF		0x2c
32#define GE_SRCAREAY_OFF		0x30
33#define GE_SRCAREAW_OFF		0x34
34#define GE_SRCAREAH_OFF		0x38
35#define GE_DESTBASE_OFF		0x3c
36#define GE_DESTDISPW_OFF	0x40
37#define GE_DESTDISPH_OFF	0x44
38#define GE_DESTAREAX_OFF	0x48
39#define GE_DESTAREAY_OFF	0x4c
40#define GE_DESTAREAW_OFF	0x50
41#define GE_DESTAREAH_OFF	0x54
42#define GE_PAT0C_OFF		0x88	/* Pattern 0 color */
43#define GE_ENABLE_OFF		0xec
44#define GE_INTEN_OFF		0xf0
45#define GE_STATUS_OFF		0xf8
46
47static void __iomem *regbase;
48
49void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
50{
51	unsigned long fg, pat;
52
53	if (p->state != FBINFO_STATE_RUNNING)
54		return;
55
56	if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
57	    p->fix.visual == FB_VISUAL_DIRECTCOLOR)
58		fg = ((u32 *) (p->pseudo_palette))[rect->color];
59	else
60		fg = rect->color;
61
62	pat = pixel_to_pat(p->var.bits_per_pixel, fg);
63
64	if (p->fbops->fb_sync)
65		p->fbops->fb_sync(p);
66
67	writel(p->var.bits_per_pixel == 32 ? 3 :
68	      (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
69	writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
70	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
71	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
72	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
73	writel(rect->dx, regbase + GE_DESTAREAX_OFF);
74	writel(rect->dy, regbase + GE_DESTAREAY_OFF);
75	writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
76	writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
77
78	writel(pat, regbase + GE_PAT0C_OFF);
79	writel(1, regbase + GE_COMMAND_OFF);
80	writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
81	writel(1, regbase + GE_FIRE_OFF);
82}
83EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
84
85void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
86{
87	if (p->state != FBINFO_STATE_RUNNING)
88		return;
89
90	if (p->fbops->fb_sync)
91		p->fbops->fb_sync(p);
92
93	writel(p->var.bits_per_pixel > 16 ? 3 :
94	      (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
95
96	writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
97	writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
98	writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
99	writel(area->sx, regbase + GE_SRCAREAX_OFF);
100	writel(area->sy, regbase + GE_SRCAREAY_OFF);
101	writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
102	writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
103
104	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
105	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
106	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
107	writel(area->dx, regbase + GE_DESTAREAX_OFF);
108	writel(area->dy, regbase + GE_DESTAREAY_OFF);
109	writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
110	writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
111
112	writel(0xcc, regbase + GE_ROPCODE_OFF);
113	writel(1, regbase + GE_COMMAND_OFF);
114	writel(1, regbase + GE_FIRE_OFF);
115}
116EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
117
118int wmt_ge_sync(struct fb_info *p)
119{
120	int loops = 5000000;
121	while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
122		cpu_relax();
123	return loops > 0 ? 0 : -EBUSY;
124}
125EXPORT_SYMBOL_GPL(wmt_ge_sync);
126
127static int wmt_ge_rops_probe(struct platform_device *pdev)
128{
129	struct resource *res;
130
131	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
132	if (res == NULL) {
133		dev_err(&pdev->dev, "no I/O memory resource defined\n");
134		return -ENODEV;
135	}
136
137	/* Only one ROP engine is presently supported. */
138	if (unlikely(regbase)) {
139		WARN_ON(1);
140		return -EBUSY;
141	}
142
143	regbase = ioremap(res->start, resource_size(res));
144	if (regbase == NULL) {
145		dev_err(&pdev->dev, "failed to map I/O memory\n");
146		return -EBUSY;
147	}
148
149	writel(1, regbase + GE_ENABLE_OFF);
150	printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
151
152	return 0;
153}
154
155static int wmt_ge_rops_remove(struct platform_device *pdev)
156{
157	iounmap(regbase);
158	return 0;
159}
160
161static const struct of_device_id wmt_dt_ids[] = {
162	{ .compatible = "wm,prizm-ge-rops", },
163	{ /* sentinel */ }
164};
165
166static struct platform_driver wmt_ge_rops_driver = {
167	.probe		= wmt_ge_rops_probe,
168	.remove		= wmt_ge_rops_remove,
169	.driver		= {
170		.name	= "wmt_ge_rops",
171		.of_match_table = wmt_dt_ids,
172	},
173};
174
175module_platform_driver(wmt_ge_rops_driver);
176
177MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
178MODULE_DESCRIPTION("Accelerators for raster operations using "
179		   "WonderMedia Graphics Engine");
180MODULE_LICENSE("GPL v2");
181MODULE_DEVICE_TABLE(of, wmt_dt_ids);
182