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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> | |
26 | #include <linux/moduleparam.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/pci.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/videodev2.h> | |
31 | #include <asm/page.h> | |
32 | #include <asm/pgtable.h> | |
33 | ||
34 | #include "btcx-risc.h" | |
35 | ||
36 | MODULE_DESCRIPTION("some code shared by bttv and cx88xx drivers"); | |
37 | MODULE_AUTHOR("Gerd Knorr"); | |
38 | MODULE_LICENSE("GPL"); | |
39 | ||
40 | static unsigned int debug = 0; | |
41 | module_param(debug, int, 0644); | |
42 | MODULE_PARM_DESC(debug,"debug messages, default is 0 (no)"); | |
43 | ||
44 | /* ---------------------------------------------------------- */ | |
45 | /* allocate/free risc memory */ | |
46 | ||
47 | static int memcnt; | |
48 | ||
49 | void btcx_riscmem_free(struct pci_dev *pci, | |
50 | struct btcx_riscmem *risc) | |
51 | { | |
52 | if (NULL == risc->cpu) | |
53 | return; | |
54 | if (debug) { | |
55 | memcnt--; | |
56 | printk("btcx: riscmem free [%d] dma=%lx\n", | |
57 | memcnt, (unsigned long)risc->dma); | |
58 | } | |
59 | pci_free_consistent(pci, risc->size, risc->cpu, risc->dma); | |
60 | memset(risc,0,sizeof(*risc)); | |
61 | } | |
62 | ||
63 | int btcx_riscmem_alloc(struct pci_dev *pci, | |
64 | struct btcx_riscmem *risc, | |
65 | unsigned int size) | |
66 | { | |
67 | u32 *cpu; | |
68 | dma_addr_t dma; | |
69 | ||
70 | if (NULL != risc->cpu && risc->size < size) | |
71 | btcx_riscmem_free(pci,risc); | |
72 | if (NULL == risc->cpu) { | |
73 | cpu = pci_alloc_consistent(pci, size, &dma); | |
74 | if (NULL == cpu) | |
75 | return -ENOMEM; | |
76 | risc->cpu = cpu; | |
77 | risc->dma = dma; | |
78 | risc->size = size; | |
79 | if (debug) { | |
80 | memcnt++; | |
81 | printk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n", | |
82 | memcnt, (unsigned long)dma, cpu, size); | |
83 | } | |
84 | } | |
85 | memset(risc->cpu,0,risc->size); | |
86 | return 0; | |
87 | } | |
88 | ||
89 | /* ---------------------------------------------------------- */ | |
90 | /* screen overlay helpers */ | |
91 | ||
92 | int | |
93 | btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win, | |
94 | struct v4l2_clip *clips, unsigned int n) | |
95 | { | |
96 | if (win->left < 0) { | |
97 | /* left */ | |
98 | clips[n].c.left = 0; | |
99 | clips[n].c.top = 0; | |
100 | clips[n].c.width = -win->left; | |
101 | clips[n].c.height = win->height; | |
102 | n++; | |
103 | } | |
104 | if (win->left + win->width > swidth) { | |
105 | /* right */ | |
106 | clips[n].c.left = swidth - win->left; | |
107 | clips[n].c.top = 0; | |
108 | clips[n].c.width = win->width - clips[n].c.left; | |
109 | clips[n].c.height = win->height; | |
110 | n++; | |
111 | } | |
112 | if (win->top < 0) { | |
113 | /* top */ | |
114 | clips[n].c.left = 0; | |
115 | clips[n].c.top = 0; | |
116 | clips[n].c.width = win->width; | |
117 | clips[n].c.height = -win->top; | |
118 | n++; | |
119 | } | |
120 | if (win->top + win->height > sheight) { | |
121 | /* bottom */ | |
122 | clips[n].c.left = 0; | |
123 | clips[n].c.top = sheight - win->top; | |
124 | clips[n].c.width = win->width; | |
125 | clips[n].c.height = win->height - clips[n].c.top; | |
126 | n++; | |
127 | } | |
128 | return n; | |
129 | } | |
130 | ||
131 | int | |
132 | btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask) | |
133 | { | |
134 | s32 nx,nw,dx; | |
135 | unsigned int i; | |
136 | ||
137 | /* fixup window */ | |
138 | nx = (win->left + mask) & ~mask; | |
139 | nw = (win->width) & ~mask; | |
140 | if (nx + nw > win->left + win->width) | |
141 | nw -= mask+1; | |
142 | dx = nx - win->left; | |
143 | win->left = nx; | |
144 | win->width = nw; | |
145 | if (debug) | |
146 | printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n", | |
147 | win->width, win->height, win->left, win->top, dx); | |
148 | ||
149 | /* fixup clips */ | |
150 | for (i = 0; i < n; i++) { | |
151 | nx = (clips[i].c.left-dx) & ~mask; | |
152 | nw = (clips[i].c.width) & ~mask; | |
153 | if (nx + nw < clips[i].c.left-dx + clips[i].c.width) | |
154 | nw += mask+1; | |
155 | clips[i].c.left = nx; | |
156 | clips[i].c.width = nw; | |
157 | if (debug) | |
158 | printk(KERN_DEBUG "btcx: clip align %dx%d+%d+%d\n", | |
159 | clips[i].c.width, clips[i].c.height, | |
160 | clips[i].c.left, clips[i].c.top); | |
161 | } | |
162 | return 0; | |
163 | } | |
164 | ||
165 | void | |
166 | btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips) | |
167 | { | |
168 | struct v4l2_clip swap; | |
169 | int i,j,n; | |
170 | ||
171 | if (nclips < 2) | |
172 | return; | |
173 | for (i = nclips-2; i >= 0; i--) { | |
174 | for (n = 0, j = 0; j <= i; j++) { | |
175 | if (clips[j].c.left > clips[j+1].c.left) { | |
176 | swap = clips[j]; | |
177 | clips[j] = clips[j+1]; | |
178 | clips[j+1] = swap; | |
179 | n++; | |
180 | } | |
181 | } | |
182 | if (0 == n) | |
183 | break; | |
184 | } | |
185 | } | |
186 | ||
187 | void | |
188 | btcx_calc_skips(int line, int width, unsigned int *maxy, | |
189 | struct btcx_skiplist *skips, unsigned int *nskips, | |
190 | const struct v4l2_clip *clips, unsigned int nclips) | |
191 | { | |
192 | unsigned int clip,skip; | |
193 | int end,maxline; | |
194 | ||
195 | skip=0; | |
196 | maxline = 9999; | |
197 | for (clip = 0; clip < nclips; clip++) { | |
198 | ||
199 | /* sanity checks */ | |
200 | if (clips[clip].c.left + clips[clip].c.width <= 0) | |
201 | continue; | |
202 | if (clips[clip].c.left > (signed)width) | |
203 | break; | |
204 | ||
205 | /* vertical range */ | |
206 | if (line > clips[clip].c.top+clips[clip].c.height-1) | |
207 | continue; | |
208 | if (line < clips[clip].c.top) { | |
209 | if (maxline > clips[clip].c.top-1) | |
210 | maxline = clips[clip].c.top-1; | |
211 | continue; | |
212 | } | |
213 | if (maxline > clips[clip].c.top+clips[clip].c.height-1) | |
214 | maxline = clips[clip].c.top+clips[clip].c.height-1; | |
215 | ||
216 | /* horizontal range */ | |
217 | if (0 == skip || clips[clip].c.left > skips[skip-1].end) { | |
218 | /* new one */ | |
219 | skips[skip].start = clips[clip].c.left; | |
220 | if (skips[skip].start < 0) | |
221 | skips[skip].start = 0; | |
222 | skips[skip].end = clips[clip].c.left + clips[clip].c.width; | |
223 | if (skips[skip].end > width) | |
224 | skips[skip].end = width; | |
225 | skip++; | |
226 | } else { | |
227 | /* overlaps -- expand last one */ | |
228 | end = clips[clip].c.left + clips[clip].c.width; | |
229 | if (skips[skip-1].end < end) | |
230 | skips[skip-1].end = end; | |
231 | if (skips[skip-1].end > width) | |
232 | skips[skip-1].end = width; | |
233 | } | |
234 | } | |
235 | *nskips = skip; | |
236 | *maxy = maxline; | |
237 | ||
238 | if (debug) { | |
239 | printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline); | |
240 | for (skip = 0; skip < *nskips; skip++) { | |
241 | printk(" %d-%d",skips[skip].start,skips[skip].end); | |
242 | } | |
243 | printk("\n"); | |
244 | } | |
245 | } | |
246 | ||
247 | /* ---------------------------------------------------------- */ | |
248 | ||
249 | EXPORT_SYMBOL(btcx_riscmem_alloc); | |
250 | EXPORT_SYMBOL(btcx_riscmem_free); | |
251 | ||
252 | EXPORT_SYMBOL(btcx_screen_clips); | |
253 | EXPORT_SYMBOL(btcx_align); | |
254 | EXPORT_SYMBOL(btcx_sort_clips); | |
255 | EXPORT_SYMBOL(btcx_calc_skips); | |
256 | ||
257 | /* | |
258 | * Local variables: | |
259 | * c-basic-offset: 8 | |
260 | * End: | |
261 | */ |