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1da177e4 | 1 | /* |
1da177e4 LT |
2 | |
3 | btcx-risc.c | |
4 | ||
5 | bt848/bt878/cx2388x risc code generator. | |
6 | ||
7 | (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs] | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
1da177e4 LT |
26 | #include <linux/init.h> |
27 | #include <linux/pci.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/videodev2.h> | |
30 | #include <asm/page.h> | |
31 | #include <asm/pgtable.h> | |
32 | ||
33 | #include "btcx-risc.h" | |
34 | ||
35 | MODULE_DESCRIPTION("some code shared by bttv and cx88xx drivers"); | |
36 | MODULE_AUTHOR("Gerd Knorr"); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
a5ed425c | 39 | static unsigned int debug; |
1da177e4 LT |
40 | module_param(debug, int, 0644); |
41 | MODULE_PARM_DESC(debug,"debug messages, default is 0 (no)"); | |
42 | ||
43 | /* ---------------------------------------------------------- */ | |
44 | /* allocate/free risc memory */ | |
45 | ||
46 | static int memcnt; | |
47 | ||
48 | void btcx_riscmem_free(struct pci_dev *pci, | |
49 | struct btcx_riscmem *risc) | |
50 | { | |
51 | if (NULL == risc->cpu) | |
52 | return; | |
53 | if (debug) { | |
54 | memcnt--; | |
55 | printk("btcx: riscmem free [%d] dma=%lx\n", | |
56 | memcnt, (unsigned long)risc->dma); | |
57 | } | |
58 | pci_free_consistent(pci, risc->size, risc->cpu, risc->dma); | |
59 | memset(risc,0,sizeof(*risc)); | |
60 | } | |
61 | ||
62 | int btcx_riscmem_alloc(struct pci_dev *pci, | |
63 | struct btcx_riscmem *risc, | |
64 | unsigned int size) | |
65 | { | |
66 | u32 *cpu; | |
67 | dma_addr_t dma; | |
68 | ||
69 | if (NULL != risc->cpu && risc->size < size) | |
70 | btcx_riscmem_free(pci,risc); | |
71 | if (NULL == risc->cpu) { | |
72 | cpu = pci_alloc_consistent(pci, size, &dma); | |
73 | if (NULL == cpu) | |
74 | return -ENOMEM; | |
75 | risc->cpu = cpu; | |
76 | risc->dma = dma; | |
77 | risc->size = size; | |
78 | if (debug) { | |
79 | memcnt++; | |
80 | printk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n", | |
81 | memcnt, (unsigned long)dma, cpu, size); | |
82 | } | |
83 | } | |
84 | memset(risc->cpu,0,risc->size); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | /* ---------------------------------------------------------- */ | |
89 | /* screen overlay helpers */ | |
90 | ||
91 | int | |
92 | btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win, | |
93 | struct v4l2_clip *clips, unsigned int n) | |
94 | { | |
95 | if (win->left < 0) { | |
96 | /* left */ | |
97 | clips[n].c.left = 0; | |
98 | clips[n].c.top = 0; | |
99 | clips[n].c.width = -win->left; | |
100 | clips[n].c.height = win->height; | |
101 | n++; | |
102 | } | |
103 | if (win->left + win->width > swidth) { | |
104 | /* right */ | |
105 | clips[n].c.left = swidth - win->left; | |
106 | clips[n].c.top = 0; | |
107 | clips[n].c.width = win->width - clips[n].c.left; | |
108 | clips[n].c.height = win->height; | |
109 | n++; | |
110 | } | |
111 | if (win->top < 0) { | |
112 | /* top */ | |
113 | clips[n].c.left = 0; | |
114 | clips[n].c.top = 0; | |
115 | clips[n].c.width = win->width; | |
116 | clips[n].c.height = -win->top; | |
117 | n++; | |
118 | } | |
119 | if (win->top + win->height > sheight) { | |
120 | /* bottom */ | |
121 | clips[n].c.left = 0; | |
122 | clips[n].c.top = sheight - win->top; | |
123 | clips[n].c.width = win->width; | |
124 | clips[n].c.height = win->height - clips[n].c.top; | |
125 | n++; | |
126 | } | |
127 | return n; | |
128 | } | |
129 | ||
130 | int | |
131 | btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask) | |
132 | { | |
133 | s32 nx,nw,dx; | |
134 | unsigned int i; | |
135 | ||
136 | /* fixup window */ | |
137 | nx = (win->left + mask) & ~mask; | |
138 | nw = (win->width) & ~mask; | |
139 | if (nx + nw > win->left + win->width) | |
140 | nw -= mask+1; | |
141 | dx = nx - win->left; | |
142 | win->left = nx; | |
143 | win->width = nw; | |
144 | if (debug) | |
145 | printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n", | |
146 | win->width, win->height, win->left, win->top, dx); | |
147 | ||
148 | /* fixup clips */ | |
149 | for (i = 0; i < n; i++) { | |
150 | nx = (clips[i].c.left-dx) & ~mask; | |
151 | nw = (clips[i].c.width) & ~mask; | |
152 | if (nx + nw < clips[i].c.left-dx + clips[i].c.width) | |
153 | nw += mask+1; | |
154 | clips[i].c.left = nx; | |
155 | clips[i].c.width = nw; | |
156 | if (debug) | |
157 | printk(KERN_DEBUG "btcx: clip align %dx%d+%d+%d\n", | |
158 | clips[i].c.width, clips[i].c.height, | |
159 | clips[i].c.left, clips[i].c.top); | |
160 | } | |
161 | return 0; | |
162 | } | |
163 | ||
164 | void | |
165 | btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips) | |
166 | { | |
167 | struct v4l2_clip swap; | |
168 | int i,j,n; | |
169 | ||
170 | if (nclips < 2) | |
171 | return; | |
172 | for (i = nclips-2; i >= 0; i--) { | |
173 | for (n = 0, j = 0; j <= i; j++) { | |
174 | if (clips[j].c.left > clips[j+1].c.left) { | |
175 | swap = clips[j]; | |
176 | clips[j] = clips[j+1]; | |
177 | clips[j+1] = swap; | |
178 | n++; | |
179 | } | |
180 | } | |
181 | if (0 == n) | |
182 | break; | |
183 | } | |
184 | } | |
185 | ||
186 | void | |
187 | btcx_calc_skips(int line, int width, unsigned int *maxy, | |
188 | struct btcx_skiplist *skips, unsigned int *nskips, | |
189 | const struct v4l2_clip *clips, unsigned int nclips) | |
190 | { | |
191 | unsigned int clip,skip; | |
192 | int end,maxline; | |
193 | ||
194 | skip=0; | |
195 | maxline = 9999; | |
196 | for (clip = 0; clip < nclips; clip++) { | |
197 | ||
198 | /* sanity checks */ | |
199 | if (clips[clip].c.left + clips[clip].c.width <= 0) | |
200 | continue; | |
201 | if (clips[clip].c.left > (signed)width) | |
202 | break; | |
203 | ||
204 | /* vertical range */ | |
205 | if (line > clips[clip].c.top+clips[clip].c.height-1) | |
206 | continue; | |
207 | if (line < clips[clip].c.top) { | |
208 | if (maxline > clips[clip].c.top-1) | |
209 | maxline = clips[clip].c.top-1; | |
210 | continue; | |
211 | } | |
212 | if (maxline > clips[clip].c.top+clips[clip].c.height-1) | |
213 | maxline = clips[clip].c.top+clips[clip].c.height-1; | |
214 | ||
215 | /* horizontal range */ | |
216 | if (0 == skip || clips[clip].c.left > skips[skip-1].end) { | |
217 | /* new one */ | |
218 | skips[skip].start = clips[clip].c.left; | |
219 | if (skips[skip].start < 0) | |
220 | skips[skip].start = 0; | |
221 | skips[skip].end = clips[clip].c.left + clips[clip].c.width; | |
222 | if (skips[skip].end > width) | |
223 | skips[skip].end = width; | |
224 | skip++; | |
225 | } else { | |
226 | /* overlaps -- expand last one */ | |
227 | end = clips[clip].c.left + clips[clip].c.width; | |
228 | if (skips[skip-1].end < end) | |
229 | skips[skip-1].end = end; | |
230 | if (skips[skip-1].end > width) | |
231 | skips[skip-1].end = width; | |
232 | } | |
233 | } | |
234 | *nskips = skip; | |
235 | *maxy = maxline; | |
236 | ||
237 | if (debug) { | |
238 | printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline); | |
239 | for (skip = 0; skip < *nskips; skip++) { | |
240 | printk(" %d-%d",skips[skip].start,skips[skip].end); | |
241 | } | |
242 | printk("\n"); | |
243 | } | |
244 | } | |
245 | ||
246 | /* ---------------------------------------------------------- */ | |
247 | ||
248 | EXPORT_SYMBOL(btcx_riscmem_alloc); | |
249 | EXPORT_SYMBOL(btcx_riscmem_free); | |
250 | ||
251 | EXPORT_SYMBOL(btcx_screen_clips); | |
252 | EXPORT_SYMBOL(btcx_align); | |
253 | EXPORT_SYMBOL(btcx_sort_clips); | |
254 | EXPORT_SYMBOL(btcx_calc_skips); | |
255 | ||
256 | /* | |
257 | * Local variables: | |
258 | * c-basic-offset: 8 | |
259 | * End: | |
260 | */ |