1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * drivers/mb862xx/mb862xxfb_accel.c
4  *
5  * Fujitsu Carmine/Coral-P(A)/Lime framebuffer driver acceleration support
6  *
7  * (C) 2007 Alexander Shishkin <virtuoso@slind.org>
8  * (C) 2009 Valentin Sitdikov <v.sitdikov@gmail.com>
9  * (C) 2009 Siemens AG
10  */
11 #include <linux/fb.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/module.h>
16 #include <linux/pci.h>
17 #include <linux/slab.h>
18 #if defined(CONFIG_OF)
19 #include <linux/of_platform.h>
20 #endif
21 #include "mb862xxfb.h"
22 #include "mb862xx_reg.h"
23 #include "mb862xxfb_accel.h"
24 
25 static void mb862xxfb_write_fifo(u32 count, u32 *data, struct fb_info *info)
26 {
27 	struct mb862xxfb_par *par = info->par;
28 	static u32 free;
29 
30 	u32 total = 0;
31 	while (total < count) {
32 		if (free) {
33 			outreg(geo, GDC_GEO_REG_INPUT_FIFO, data[total]);
34 			total++;
35 			free--;
36 		} else {
37 			free = (u32) inreg(draw, GDC_REG_FIFO_COUNT);
38 		}
39 	}
40 }
41 
42 static void mb86290fb_copyarea(struct fb_info *info,
43 			       const struct fb_copyarea *area)
44 {
45 	__u32 cmd[6];
46 
47 	cmd[0] = (GDC_TYPE_SETREGISTER << 24) | (1 << 16) | GDC_REG_MODE_BITMAP;
48 	/* Set raster operation */
49 	cmd[1] = (2 << 7) | (GDC_ROP_COPY << 9);
50 	cmd[2] = GDC_TYPE_BLTCOPYP << 24;
51 
52 	if (area->sx >= area->dx && area->sy >= area->dy)
53 		cmd[2] |= GDC_CMD_BLTCOPY_TOP_LEFT << 16;
54 	else if (area->sx >= area->dx && area->sy <= area->dy)
55 		cmd[2] |= GDC_CMD_BLTCOPY_BOTTOM_LEFT << 16;
56 	else if (area->sx <= area->dx && area->sy >= area->dy)
57 		cmd[2] |= GDC_CMD_BLTCOPY_TOP_RIGHT << 16;
58 	else
59 		cmd[2] |= GDC_CMD_BLTCOPY_BOTTOM_RIGHT << 16;
60 
61 	cmd[3] = (area->sy << 16) | area->sx;
62 	cmd[4] = (area->dy << 16) | area->dx;
63 	cmd[5] = (area->height << 16) | area->width;
64 	mb862xxfb_write_fifo(6, cmd, info);
65 }
66 
67 /*
68  * Fill in the cmd array /GDC FIFO commands/ to draw a 1bit image.
69  * Make sure cmd has enough room!
70  */
71 static void mb86290fb_imageblit1(u32 *cmd, u16 step, u16 dx, u16 dy,
72 				 u16 width, u16 height, u32 fgcolor,
73 				 u32 bgcolor, const struct fb_image *image,
74 				 struct fb_info *info)
75 {
76 	int i;
77 	unsigned const char *line;
78 	u16 bytes;
79 
80 	/* set colors and raster operation regs */
81 	cmd[0] = (GDC_TYPE_SETREGISTER << 24) | (1 << 16) | GDC_REG_MODE_BITMAP;
82 	/* Set raster operation */
83 	cmd[1] = (2 << 7) | (GDC_ROP_COPY << 9);
84 	cmd[2] =
85 	    (GDC_TYPE_SETCOLORREGISTER << 24) | (GDC_CMD_BODY_FORE_COLOR << 16);
86 	cmd[3] = fgcolor;
87 	cmd[4] =
88 	    (GDC_TYPE_SETCOLORREGISTER << 24) | (GDC_CMD_BODY_BACK_COLOR << 16);
89 	cmd[5] = bgcolor;
90 
91 	i = 0;
92 	line = image->data;
93 	bytes = (image->width + 7) >> 3;
94 
95 	/* and the image */
96 	cmd[6] = (GDC_TYPE_DRAWBITMAPP << 24) |
97 	    (GDC_CMD_BITMAP << 16) | (2 + (step * height));
98 	cmd[7] = (dy << 16) | dx;
99 	cmd[8] = (height << 16) | width;
100 
101 	while (i < height) {
102 		memcpy(&cmd[9 + i * step], line, step << 2);
103 #ifdef __LITTLE_ENDIAN
104 		{
105 			int k = 0;
106 			for (k = 0; k < step; k++)
107 				cmd[9 + i * step + k] =
108 				    cpu_to_be32(cmd[9 + i * step + k]);
109 		}
110 #endif
111 		line += bytes;
112 		i++;
113 	}
114 }
115 
116 /*
117  * Fill in the cmd array /GDC FIFO commands/ to draw a 8bit image.
118  * Make sure cmd has enough room!
119  */
120 static void mb86290fb_imageblit8(u32 *cmd, u16 step, u16 dx, u16 dy,
121 				 u16 width, u16 height, u32 fgcolor,
122 				 u32 bgcolor, const struct fb_image *image,
123 				 struct fb_info *info)
124 {
125 	int i, j;
126 	unsigned const char *line, *ptr;
127 	u16 bytes;
128 
129 	cmd[0] = (GDC_TYPE_DRAWBITMAPP << 24) |
130 	    (GDC_CMD_BLT_DRAW << 16) | (2 + (height * step));
131 	cmd[1] = (dy << 16) | dx;
132 	cmd[2] = (height << 16) | width;
133 
134 	i = 0;
135 	line = image->data;
136 	bytes = image->width;
137 
138 	while (i < height) {
139 		ptr = line;
140 		for (j = 0; j < step; j++) {
141 			cmd[3 + i * step + j] =
142 			    (((u32 *) (info->pseudo_palette))[*ptr]) & 0xffff;
143 			ptr++;
144 			cmd[3 + i * step + j] |=
145 			    ((((u32 *) (info->
146 					pseudo_palette))[*ptr]) & 0xffff) << 16;
147 			ptr++;
148 		}
149 
150 		line += bytes;
151 		i++;
152 	}
153 }
154 
155 /*
156  * Fill in the cmd array /GDC FIFO commands/ to draw a 16bit image.
157  * Make sure cmd has enough room!
158  */
159 static void mb86290fb_imageblit16(u32 *cmd, u16 step, u16 dx, u16 dy,
160 				  u16 width, u16 height, u32 fgcolor,
161 				  u32 bgcolor, const struct fb_image *image,
162 				  struct fb_info *info)
163 {
164 	int i;
165 	unsigned const char *line;
166 	u16 bytes;
167 
168 	i = 0;
169 	line = image->data;
170 	bytes = image->width << 1;
171 
172 	cmd[0] = (GDC_TYPE_DRAWBITMAPP << 24) |
173 	    (GDC_CMD_BLT_DRAW << 16) | (2 + step * height);
174 	cmd[1] = (dy << 16) | dx;
175 	cmd[2] = (height << 16) | width;
176 
177 	while (i < height) {
178 		memcpy(&cmd[3 + i * step], line, step);
179 		line += bytes;
180 		i++;
181 	}
182 }
183 
184 static void mb86290fb_imageblit(struct fb_info *info,
185 				const struct fb_image *image)
186 {
187 	u32 *cmd = NULL;
188 	void (*cmdfn) (u32 *, u16, u16, u16, u16, u16, u32, u32,
189 		       const struct fb_image *, struct fb_info *) = NULL;
190 	u32 cmdlen;
191 	u32 fgcolor = 0, bgcolor = 0;
192 	u16 step;
193 
194 	u16 width = image->width, height = image->height;
195 	u16 dx = image->dx, dy = image->dy;
196 	int x2, y2, vxres, vyres;
197 
198 	x2 = image->dx + image->width;
199 	y2 = image->dy + image->height;
200 	vxres = info->var.xres_virtual;
201 	vyres = info->var.yres_virtual;
202 	x2 = min(x2, vxres);
203 	y2 = min(y2, vyres);
204 	width = x2 - dx;
205 	height = y2 - dy;
206 
207 	switch (image->depth) {
208 	case 1:
209 		step = (width + 31) >> 5;
210 		cmdlen = 9 + height * step;
211 		cmdfn = mb86290fb_imageblit1;
212 		if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
213 		    info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
214 			fgcolor =
215 			    ((u32 *) (info->pseudo_palette))[image->fg_color];
216 			bgcolor =
217 			    ((u32 *) (info->pseudo_palette))[image->bg_color];
218 		} else {
219 			fgcolor = image->fg_color;
220 			bgcolor = image->bg_color;
221 		}
222 
223 		break;
224 
225 	case 8:
226 		step = (width + 1) >> 1;
227 		cmdlen = 3 + height * step;
228 		cmdfn = mb86290fb_imageblit8;
229 		break;
230 
231 	case 16:
232 		step = (width + 1) >> 1;
233 		cmdlen = 3 + height * step;
234 		cmdfn = mb86290fb_imageblit16;
235 		break;
236 
237 	default:
238 		cfb_imageblit(info, image);
239 		return;
240 	}
241 
242 	cmd = kmalloc_array(cmdlen, 4, GFP_DMA);
243 	if (!cmd)
244 		return cfb_imageblit(info, image);
245 	cmdfn(cmd, step, dx, dy, width, height, fgcolor, bgcolor, image, info);
246 	mb862xxfb_write_fifo(cmdlen, cmd, info);
247 	kfree(cmd);
248 }
249 
250 static void mb86290fb_fillrect(struct fb_info *info,
251 			       const struct fb_fillrect *rect)
252 {
253 
254 	u32 x2, y2, vxres, vyres, height, width, fg;
255 	u32 cmd[7];
256 
257 	vxres = info->var.xres_virtual;
258 	vyres = info->var.yres_virtual;
259 
260 	if (!rect->width || !rect->height || rect->dx > vxres
261 	    || rect->dy > vyres)
262 		return;
263 
264 	/* We could use hardware clipping but on many cards you get around
265 	 * hardware clipping by writing to framebuffer directly. */
266 	x2 = rect->dx + rect->width;
267 	y2 = rect->dy + rect->height;
268 	x2 = min(x2, vxres);
269 	y2 = min(y2, vyres);
270 	width = x2 - rect->dx;
271 	height = y2 - rect->dy;
272 	if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
273 	    info->fix.visual == FB_VISUAL_DIRECTCOLOR)
274 		fg = ((u32 *) (info->pseudo_palette))[rect->color];
275 	else
276 		fg = rect->color;
277 
278 	switch (rect->rop) {
279 
280 	case ROP_XOR:
281 		/* Set raster operation */
282 		cmd[1] = (2 << 7) | (GDC_ROP_XOR << 9);
283 		break;
284 
285 	case ROP_COPY:
286 		/* Set raster operation */
287 		cmd[1] = (2 << 7) | (GDC_ROP_COPY << 9);
288 		break;
289 
290 	}
291 
292 	cmd[0] = (GDC_TYPE_SETREGISTER << 24) | (1 << 16) | GDC_REG_MODE_BITMAP;
293 	/* cmd[1] set earlier */
294 	cmd[2] =
295 	    (GDC_TYPE_SETCOLORREGISTER << 24) | (GDC_CMD_BODY_FORE_COLOR << 16);
296 	cmd[3] = fg;
297 	cmd[4] = (GDC_TYPE_DRAWRECTP << 24) | (GDC_CMD_BLT_FILL << 16);
298 	cmd[5] = (rect->dy << 16) | (rect->dx);
299 	cmd[6] = (height << 16) | width;
300 
301 	mb862xxfb_write_fifo(7, cmd, info);
302 }
303 
304 void mb862xxfb_init_accel(struct fb_info *info, struct fb_ops *fbops, int xres)
305 {
306 	struct mb862xxfb_par *par = info->par;
307 
308 	if (info->var.bits_per_pixel == 32) {
309 		fbops->fb_fillrect = cfb_fillrect;
310 		fbops->fb_copyarea = cfb_copyarea;
311 		fbops->fb_imageblit = cfb_imageblit;
312 	} else {
313 		outreg(disp, GC_L0EM, 3);
314 		fbops->fb_fillrect = mb86290fb_fillrect;
315 		fbops->fb_copyarea = mb86290fb_copyarea;
316 		fbops->fb_imageblit = mb86290fb_imageblit;
317 	}
318 	outreg(draw, GDC_REG_DRAW_BASE, 0);
319 	outreg(draw, GDC_REG_MODE_MISC, 0x8000);
320 	outreg(draw, GDC_REG_X_RESOLUTION, xres);
321 
322 	info->flags |=
323 	    FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT |
324 	    FBINFO_HWACCEL_IMAGEBLIT;
325 	info->fix.accel = 0xff;	/*FIXME: add right define */
326 }
327 
328 MODULE_LICENSE("GPL v2");
329