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
42static void __iomem *regbase;
43
44void 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}
78EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
79
80void 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}
111EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
112
113int 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}
120EXPORT_SYMBOL_GPL(wmt_ge_sync);
121
122static 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
150static void wmt_ge_rops_remove(struct platform_device *pdev)
151{
152	iounmap(regbase);
153}
154
155static const struct of_device_id wmt_dt_ids[] = {
156	{ .compatible = "wm,prizm-ge-rops", },
157	{ /* sentinel */ }
158};
159
160static 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
169module_platform_driver(wmt_ge_rops_driver);
170
171MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
172MODULE_DESCRIPTION("Accelerators for raster operations using "
173		   "WonderMedia Graphics Engine");
174MODULE_DEVICE_TABLE(of, wmt_dt_ids);
175