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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
35MODULE_DESCRIPTION("some code shared by bttv and cx88xx drivers");
36MODULE_AUTHOR("Gerd Knorr");
37MODULE_LICENSE("GPL");
38
39static unsigned int debug;
40module_param(debug, int, 0644);
41MODULE_PARM_DESC(debug,"debug messages, default is 0 (no)");
42
43
44
45
46static int memcnt;
47
48void 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
62int btcx_riscmem_alloc(struct pci_dev *pci,
63 struct btcx_riscmem *risc,
64 unsigned int size)
65{
66 __le32 *cpu;
67 dma_addr_t dma = 0;
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
90
91int
92btcx_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
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
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
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
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
130int
131btcx_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
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
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
164void
165btcx_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 gmb();
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
187void
188btcx_calc_skips(int line, int width, 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
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
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
217 if (0 == skip || clips[clip].c.left > skips[skip-1].end) {
218
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
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
249EXPORT_SYMBOL(btcx_riscmem_alloc);
250EXPORT_SYMBOL(btcx_riscmem_free);
251
252EXPORT_SYMBOL(btcx_screen_clips);
253EXPORT_SYMBOL(btcx_align);
254EXPORT_SYMBOL(btcx_sort_clips);
255EXPORT_SYMBOL(btcx_calc_skips);
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