1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2013 Matrox Graphics
4 *
5 * Author: Christopher Harvey <charvey@matrox.com>
6 */
7
8 #include <drm/drm_pci.h>
9
10 #include "mgag200_drv.h"
11
12 static bool warn_transparent = true;
13 static bool warn_palette = true;
14
15 /*
16 Hide the cursor off screen. We can't disable the cursor hardware because it
17 takes too long to re-activate and causes momentary corruption
18 */
mga_hide_cursor(struct mga_device * mdev)19 static void mga_hide_cursor(struct mga_device *mdev)
20 {
21 WREG8(MGA_CURPOSXL, 0);
22 WREG8(MGA_CURPOSXH, 0);
23 if (mdev->cursor.pixels_current)
24 drm_gem_vram_unpin(mdev->cursor.pixels_current);
25 mdev->cursor.pixels_current = NULL;
26 }
27
mga_crtc_cursor_set(struct drm_crtc * crtc,struct drm_file * file_priv,uint32_t handle,uint32_t width,uint32_t height)28 int mga_crtc_cursor_set(struct drm_crtc *crtc,
29 struct drm_file *file_priv,
30 uint32_t handle,
31 uint32_t width,
32 uint32_t height)
33 {
34 struct drm_device *dev = crtc->dev;
35 struct mga_device *mdev = (struct mga_device *)dev->dev_private;
36 struct drm_gem_vram_object *pixels_1 = mdev->cursor.pixels_1;
37 struct drm_gem_vram_object *pixels_2 = mdev->cursor.pixels_2;
38 struct drm_gem_vram_object *pixels_current = mdev->cursor.pixels_current;
39 struct drm_gem_vram_object *pixels_next;
40 struct drm_gem_object *obj;
41 struct drm_gem_vram_object *gbo = NULL;
42 int ret = 0;
43 u8 *src, *dst;
44 unsigned int i, row, col;
45 uint32_t colour_set[16];
46 uint32_t *next_space = &colour_set[0];
47 uint32_t *palette_iter;
48 uint32_t this_colour;
49 bool found = false;
50 int colour_count = 0;
51 s64 gpu_addr;
52 u64 dst_gpu;
53 u8 reg_index;
54 u8 this_row[48];
55
56 if (!pixels_1 || !pixels_2) {
57 WREG8(MGA_CURPOSXL, 0);
58 WREG8(MGA_CURPOSXH, 0);
59 return -ENOTSUPP; /* Didn't allocate space for cursors */
60 }
61
62 if (WARN_ON(pixels_current &&
63 pixels_1 != pixels_current &&
64 pixels_2 != pixels_current)) {
65 return -ENOTSUPP; /* inconsistent state */
66 }
67
68 if (!handle || !file_priv) {
69 mga_hide_cursor(mdev);
70 return 0;
71 }
72
73 if (width != 64 || height != 64) {
74 WREG8(MGA_CURPOSXL, 0);
75 WREG8(MGA_CURPOSXH, 0);
76 return -EINVAL;
77 }
78
79 if (pixels_current == pixels_1)
80 pixels_next = pixels_2;
81 else
82 pixels_next = pixels_1;
83
84 obj = drm_gem_object_lookup(file_priv, handle);
85 if (!obj)
86 return -ENOENT;
87 gbo = drm_gem_vram_of_gem(obj);
88 ret = drm_gem_vram_pin(gbo, 0);
89 if (ret) {
90 dev_err(&dev->pdev->dev, "failed to lock user bo\n");
91 goto err_drm_gem_object_put_unlocked;
92 }
93 src = drm_gem_vram_kmap(gbo, true, NULL);
94 if (IS_ERR(src)) {
95 ret = PTR_ERR(src);
96 dev_err(&dev->pdev->dev,
97 "failed to kmap user buffer updates\n");
98 goto err_drm_gem_vram_unpin_src;
99 }
100
101 /* Pin and map up-coming buffer to write colour indices */
102 ret = drm_gem_vram_pin(pixels_next, DRM_GEM_VRAM_PL_FLAG_VRAM);
103 if (ret) {
104 dev_err(&dev->pdev->dev,
105 "failed to pin cursor buffer: %d\n", ret);
106 goto err_drm_gem_vram_kunmap_src;
107 }
108 dst = drm_gem_vram_kmap(pixels_next, true, NULL);
109 if (IS_ERR(dst)) {
110 ret = PTR_ERR(dst);
111 dev_err(&dev->pdev->dev,
112 "failed to kmap cursor updates: %d\n", ret);
113 goto err_drm_gem_vram_unpin_dst;
114 }
115 gpu_addr = drm_gem_vram_offset(pixels_next);
116 if (gpu_addr < 0) {
117 ret = (int)gpu_addr;
118 dev_err(&dev->pdev->dev,
119 "failed to get cursor scanout address: %d\n", ret);
120 goto err_drm_gem_vram_kunmap_dst;
121 }
122 dst_gpu = (u64)gpu_addr;
123
124 memset(&colour_set[0], 0, sizeof(uint32_t)*16);
125 /* width*height*4 = 16384 */
126 for (i = 0; i < 16384; i += 4) {
127 this_colour = ioread32(src + i);
128 /* No transparency */
129 if (this_colour>>24 != 0xff &&
130 this_colour>>24 != 0x0) {
131 if (warn_transparent) {
132 dev_info(&dev->pdev->dev, "Video card doesn't support cursors with partial transparency.\n");
133 dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
134 warn_transparent = false; /* Only tell the user once. */
135 }
136 ret = -EINVAL;
137 goto err_drm_gem_vram_kunmap_dst;
138 }
139 /* Don't need to store transparent pixels as colours */
140 if (this_colour>>24 == 0x0)
141 continue;
142 found = false;
143 for (palette_iter = &colour_set[0]; palette_iter != next_space; palette_iter++) {
144 if (*palette_iter == this_colour) {
145 found = true;
146 break;
147 }
148 }
149 if (found)
150 continue;
151 /* We only support 4bit paletted cursors */
152 if (colour_count >= 16) {
153 if (warn_palette) {
154 dev_info(&dev->pdev->dev, "Video card only supports cursors with up to 16 colours.\n");
155 dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
156 warn_palette = false; /* Only tell the user once. */
157 }
158 ret = -EINVAL;
159 goto err_drm_gem_vram_kunmap_dst;
160 }
161 *next_space = this_colour;
162 next_space++;
163 colour_count++;
164 }
165
166 /* Program colours from cursor icon into palette */
167 for (i = 0; i < colour_count; i++) {
168 if (i <= 2)
169 reg_index = 0x8 + i*0x4;
170 else
171 reg_index = 0x60 + i*0x3;
172 WREG_DAC(reg_index, colour_set[i] & 0xff);
173 WREG_DAC(reg_index+1, colour_set[i]>>8 & 0xff);
174 WREG_DAC(reg_index+2, colour_set[i]>>16 & 0xff);
175 BUG_ON((colour_set[i]>>24 & 0xff) != 0xff);
176 }
177
178 /* now write colour indices into hardware cursor buffer */
179 for (row = 0; row < 64; row++) {
180 memset(&this_row[0], 0, 48);
181 for (col = 0; col < 64; col++) {
182 this_colour = ioread32(src + 4*(col + 64*row));
183 /* write transparent pixels */
184 if (this_colour>>24 == 0x0) {
185 this_row[47 - col/8] |= 0x80>>(col%8);
186 continue;
187 }
188
189 /* write colour index here */
190 for (i = 0; i < colour_count; i++) {
191 if (colour_set[i] == this_colour) {
192 if (col % 2)
193 this_row[col/2] |= i<<4;
194 else
195 this_row[col/2] |= i;
196 break;
197 }
198 }
199 }
200 memcpy_toio(dst + row*48, &this_row[0], 48);
201 }
202
203 /* Program gpu address of cursor buffer */
204 WREG_DAC(MGA1064_CURSOR_BASE_ADR_LOW, (u8)((dst_gpu>>10) & 0xff));
205 WREG_DAC(MGA1064_CURSOR_BASE_ADR_HI, (u8)((dst_gpu>>18) & 0x3f));
206
207 /* Adjust cursor control register to turn on the cursor */
208 WREG_DAC(MGA1064_CURSOR_CTL, 4); /* 16-colour palletized cursor mode */
209
210 /* Now update internal buffer pointers */
211 if (pixels_current)
212 drm_gem_vram_unpin(pixels_current);
213 mdev->cursor.pixels_current = pixels_next;
214
215 drm_gem_vram_kunmap(pixels_next);
216 drm_gem_vram_kunmap(gbo);
217 drm_gem_vram_unpin(gbo);
218 drm_gem_object_put_unlocked(obj);
219
220 return 0;
221
222 err_drm_gem_vram_kunmap_dst:
223 drm_gem_vram_kunmap(pixels_next);
224 err_drm_gem_vram_unpin_dst:
225 drm_gem_vram_unpin(pixels_next);
226 err_drm_gem_vram_kunmap_src:
227 drm_gem_vram_kunmap(gbo);
228 err_drm_gem_vram_unpin_src:
229 drm_gem_vram_unpin(gbo);
230 err_drm_gem_object_put_unlocked:
231 drm_gem_object_put_unlocked(obj);
232 return ret;
233 }
234
mga_crtc_cursor_move(struct drm_crtc * crtc,int x,int y)235 int mga_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
236 {
237 struct mga_device *mdev = (struct mga_device *)crtc->dev->dev_private;
238 /* Our origin is at (64,64) */
239 x += 64;
240 y += 64;
241
242 BUG_ON(x <= 0);
243 BUG_ON(y <= 0);
244 BUG_ON(x & ~0xffff);
245 BUG_ON(y & ~0xffff);
246
247 WREG8(MGA_CURPOSXL, x & 0xff);
248 WREG8(MGA_CURPOSXH, (x>>8) & 0xff);
249
250 WREG8(MGA_CURPOSYL, y & 0xff);
251 WREG8(MGA_CURPOSYH, (y>>8) & 0xff);
252 return 0;
253 }
254
