1 /*
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/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
39 static unsigned int debug;
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 */
261
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