1 // SPDX-License-Identifier: GPL-2.0-or-later
6 bt848/bt878/cx2388x risc code generator.
8 (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/pci.h>
18 #include <linux/interrupt.h>
19 #include <linux/videodev2.h>
20 #include <linux/pgtable.h>
23 #include "btcx-risc.h"
25 static unsigned int btcx_debug;
26 module_param(btcx_debug, int, 0644);
27 MODULE_PARM_DESC(btcx_debug,"debug messages, default is 0 (no)");
29 #define dprintk(fmt, arg...) do { \
31 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
36 /* ---------------------------------------------------------- */
37 /* allocate/free risc memory */
41 void btcx_riscmem_free(struct pci_dev *pci,
42 struct btcx_riscmem *risc)
44 if (NULL == risc->cpu)
48 dprintk("btcx: riscmem free [%d] dma=%lx\n",
49 memcnt, (unsigned long)risc->dma);
51 pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
52 memset(risc,0,sizeof(*risc));
55 int btcx_riscmem_alloc(struct pci_dev *pci,
56 struct btcx_riscmem *risc,
62 if (NULL != risc->cpu && risc->size < size)
63 btcx_riscmem_free(pci,risc);
64 if (NULL == risc->cpu) {
65 cpu = pci_alloc_consistent(pci, size, &dma);
73 dprintk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
74 memcnt, (unsigned long)dma, cpu, size);
76 memset(risc->cpu,0,risc->size);
80 /* ---------------------------------------------------------- */
81 /* screen overlay helpers */
84 btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win,
85 struct v4l2_clip *clips, unsigned int n)
91 clips[n].c.width = -win->left;
92 clips[n].c.height = win->height;
95 if (win->left + win->width > swidth) {
97 clips[n].c.left = swidth - win->left;
99 clips[n].c.width = win->width - clips[n].c.left;
100 clips[n].c.height = win->height;
107 clips[n].c.width = win->width;
108 clips[n].c.height = -win->top;
111 if (win->top + win->height > sheight) {
114 clips[n].c.top = sheight - win->top;
115 clips[n].c.width = win->width;
116 clips[n].c.height = win->height - clips[n].c.top;
123 btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask)
129 nx = (win->left + mask) & ~mask;
130 nw = (win->width) & ~mask;
131 if (nx + nw > win->left + win->width)
136 dprintk("btcx: window align %dx%d+%d+%d [dx=%d]\n",
137 win->width, win->height, win->left, win->top, dx);
140 for (i = 0; i < n; i++) {
141 nx = (clips[i].c.left-dx) & ~mask;
142 nw = (clips[i].c.width) & ~mask;
143 if (nx + nw < clips[i].c.left-dx + clips[i].c.width)
145 clips[i].c.left = nx;
146 clips[i].c.width = nw;
147 dprintk("btcx: clip align %dx%d+%d+%d\n",
148 clips[i].c.width, clips[i].c.height,
149 clips[i].c.left, clips[i].c.top);
155 btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips)
161 for (i = nclips-2; i >= 0; i--) {
162 for (n = 0, j = 0; j <= i; j++) {
163 if (clips[j].c.left > clips[j+1].c.left) {
164 swap(clips[j], clips[j + 1]);
174 btcx_calc_skips(int line, int width, int *maxy,
175 struct btcx_skiplist *skips, unsigned int *nskips,
176 const struct v4l2_clip *clips, unsigned int nclips)
178 unsigned int clip,skip;
183 for (clip = 0; clip < nclips; clip++) {
186 if (clips[clip].c.left + clips[clip].c.width <= 0)
188 if (clips[clip].c.left > (signed)width)
192 if (line > clips[clip].c.top+clips[clip].c.height-1)
194 if (line < clips[clip].c.top) {
195 if (maxline > clips[clip].c.top-1)
196 maxline = clips[clip].c.top-1;
199 if (maxline > clips[clip].c.top+clips[clip].c.height-1)
200 maxline = clips[clip].c.top+clips[clip].c.height-1;
202 /* horizontal range */
203 if (0 == skip || clips[clip].c.left > skips[skip-1].end) {
205 skips[skip].start = clips[clip].c.left;
206 if (skips[skip].start < 0)
207 skips[skip].start = 0;
208 skips[skip].end = clips[clip].c.left + clips[clip].c.width;
209 if (skips[skip].end > width)
210 skips[skip].end = width;
213 /* overlaps -- expand last one */
214 end = clips[clip].c.left + clips[clip].c.width;
215 if (skips[skip-1].end < end)
216 skips[skip-1].end = end;
217 if (skips[skip-1].end > width)
218 skips[skip-1].end = width;
225 dprintk("btcx: skips line %d-%d:", line, maxline);
226 for (skip = 0; skip < *nskips; skip++) {
227 pr_cont(" %d-%d", skips[skip].start, skips[skip].end);