wmt_ge_rops.c

  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/export.h>
 11#include <linux/module.h>
 12#include <linux/fb.h>
 13#include <linux/io.h>
 14#include <linux/platform_device.h>
 15
 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
 44/* from the spec it seems more like depth than bits per pixel */
 45static inline unsigned long pixel_to_pat(u32 depth, u32 pixel, struct fb_info *p)
 46{
 47	switch (depth) {
 48	case 1:
 49		return ~0ul*pixel;
 50	case 2:
 51		return ~0ul/3*pixel;
 52	case 4:
 53		return ~0ul/15*pixel;
 54	case 8:
 55		return ~0ul/255*pixel;
 56	case 12:
 57	case 15:
 58	case 16:
 59		return ~0ul/0xffff*pixel;
 60	case 18:
 61	case 24:
 62		return 0x1000001ul*pixel;
 63	case 32:
 64		return pixel;
 65	default:
 66		fb_warn_once(p, "%s: unsupported pixelformat %d\n", __func__, depth);
 67		return 0;
 68	}
 69}
 70
 71void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
 72{
 73	unsigned long fg, pat;
 74
 75	if (p->state != FBINFO_STATE_RUNNING)
 76		return;
 77
 78	if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
 79	    p->fix.visual == FB_VISUAL_DIRECTCOLOR)
 80		fg = ((u32 *) (p->pseudo_palette))[rect->color];
 81	else
 82		fg = rect->color;
 83
 84	pat = pixel_to_pat(p->var.bits_per_pixel, fg, p);
 85
 86	if (p->fbops->fb_sync)
 87		p->fbops->fb_sync(p);
 88
 89	writel(p->var.bits_per_pixel == 32 ? 3 :
 90	      (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF);
 91	writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF);
 92	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
 93	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
 94	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
 95	writel(rect->dx, regbase + GE_DESTAREAX_OFF);
 96	writel(rect->dy, regbase + GE_DESTAREAY_OFF);
 97	writel(rect->width - 1, regbase + GE_DESTAREAW_OFF);
 98	writel(rect->height - 1, regbase + GE_DESTAREAH_OFF);
 99
100	writel(pat, regbase + GE_PAT0C_OFF);
101	writel(1, regbase + GE_COMMAND_OFF);
102	writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF);
103	writel(1, regbase + GE_FIRE_OFF);
104}
105EXPORT_SYMBOL_GPL(wmt_ge_fillrect);
106
107void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area)
108{
109	if (p->state != FBINFO_STATE_RUNNING)
110		return;
111
112	if (p->fbops->fb_sync)
113		p->fbops->fb_sync(p);
114
115	writel(p->var.bits_per_pixel > 16 ? 3 :
116	      (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF);
117
118	writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF);
119	writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF);
120	writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF);
121	writel(area->sx, regbase + GE_SRCAREAX_OFF);
122	writel(area->sy, regbase + GE_SRCAREAY_OFF);
123	writel(area->width - 1, regbase + GE_SRCAREAW_OFF);
124	writel(area->height - 1, regbase + GE_SRCAREAH_OFF);
125
126	writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF);
127	writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF);
128	writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF);
129	writel(area->dx, regbase + GE_DESTAREAX_OFF);
130	writel(area->dy, regbase + GE_DESTAREAY_OFF);
131	writel(area->width - 1, regbase + GE_DESTAREAW_OFF);
132	writel(area->height - 1, regbase + GE_DESTAREAH_OFF);
133
134	writel(0xcc, regbase + GE_ROPCODE_OFF);
135	writel(1, regbase + GE_COMMAND_OFF);
136	writel(1, regbase + GE_FIRE_OFF);
137}
138EXPORT_SYMBOL_GPL(wmt_ge_copyarea);
139
140int wmt_ge_sync(struct fb_info *p)
141{
142	int loops = 5000000;
143	while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops)
144		cpu_relax();
145	return loops > 0 ? 0 : -EBUSY;
146}
147EXPORT_SYMBOL_GPL(wmt_ge_sync);
148
149static int wmt_ge_rops_probe(struct platform_device *pdev)
150{
151	struct resource *res;
152
153	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
154	if (res == NULL) {
155		dev_err(&pdev->dev, "no I/O memory resource defined\n");
156		return -ENODEV;
157	}
158
159	/* Only one ROP engine is presently supported. */
160	if (unlikely(regbase)) {
161		WARN_ON(1);
162		return -EBUSY;
163	}
164
165	regbase = ioremap(res->start, resource_size(res));
166	if (regbase == NULL) {
167		dev_err(&pdev->dev, "failed to map I/O memory\n");
168		return -EBUSY;
169	}
170
171	writel(1, regbase + GE_ENABLE_OFF);
172	printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n");
173
174	return 0;
175}
176
177static void wmt_ge_rops_remove(struct platform_device *pdev)
178{
179	iounmap(regbase);
180}
181
182static const struct of_device_id wmt_dt_ids[] = {
183	{ .compatible = "wm,prizm-ge-rops", },
184	{ /* sentinel */ }
185};
186
187static struct platform_driver wmt_ge_rops_driver = {
188	.probe		= wmt_ge_rops_probe,
189	.remove		= wmt_ge_rops_remove,
190	.driver		= {
191		.name	= "wmt_ge_rops",
192		.of_match_table = wmt_dt_ids,
193	},
194};
195
196module_platform_driver(wmt_ge_rops_driver);
197
198MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
199MODULE_DESCRIPTION("Accelerators for raster operations using "
200		   "WonderMedia Graphics Engine");
201MODULE_DEVICE_TABLE(of, wmt_dt_ids);