WebSVN - shark - Blame - Rev 613 - /shark/trunk/drivers/bttv/btcx-risc.c

Rev	Author	Line No.	Line
481	giacomo	1	/*
		2	btcx-risc.c
		3
		4	bt848/bt878/cx2388x risc code generator.
		5
		6	(c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
		7
		8	This program is free software; you can redistribute it and/or modify
		9	it under the terms of the GNU General Public License as published by
		10	the Free Software Foundation; either version 2 of the License, or
		11	(at your option) any later version.
		12
		13	This program is distributed in the hope that it will be useful,
		14	but WITHOUT ANY WARRANTY; without even the implied warranty of
		15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		16	GNU General Public License for more details.
		17
		18	You should have received a copy of the GNU General Public License
		19	along with this program; if not, write to the Free Software
		20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
		21
		22	*/
		23
		24	#include <linuxcomp.h>
		25
		26	#include <linux/module.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_PARM(debug,"i");
		42	MODULE_PARM_DESC(debug,"debug messages, default is 0 (no)");
		43
		44	/* ---------------------------------------------------------- */
		45	/* allocate/free risc memory */
		46
		47	static int memcnt;
		48
537	giacomo	49	extern void vfree_32(void *t);
		50
481	giacomo	51	void btcx_riscmem_free(struct pci_dev *pci,
		52	struct btcx_riscmem *risc)
		53	{
613	giacomo	54	if (NULL == risc)
		55	return;
481	giacomo	56	if (NULL == risc->cpu)
		57	return;
		58	pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
613	giacomo	59	vfree((void *)risc->cpu);
481	giacomo	60	memset(risc,0,sizeof(*risc));
		61	if (debug) {
		62	memcnt--;
		63	printk("btcx: riscmem free [%d]\n",memcnt);
		64	}
		65	}
		66
		67	int btcx_riscmem_alloc(struct pci_dev *pci,
		68	struct btcx_riscmem *risc,
		69	unsigned int size)
		70	{
		71	u32 *cpu;
		72	dma_addr_t dma;
		73
		74	if (NULL != risc->cpu && risc->size < size)
		75	btcx_riscmem_free(pci,risc);
		76	if (NULL == risc->cpu) {
		77	cpu = pci_alloc_consistent(pci, size, &dma);
		78	if (NULL == cpu)
		79	return -ENOMEM;
		80	risc->cpu = cpu;
		81	risc->dma = dma;
		82	risc->size = size;
		83	if (debug) {
		84	memcnt++;
		85	printk("btcx: riscmem alloc size=%d [%d]\n",size,memcnt);
		86	}
		87	}
		88	memset(risc->cpu,0,risc->size);
		89	return 0;
		90	}
		91
		92	/* ---------------------------------------------------------- */
		93	/* screen overlay helpers */
		94
		95	int
		96	btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win,
		97	struct v4l2_clip *clips, unsigned int n)
		98	{
		99	if (win->left < 0) {
		100	/* left */
		101	clips[n].c.left = 0;
		102	clips[n].c.top = 0;
		103	clips[n].c.width = -win->left;
		104	clips[n].c.height = win->height;
		105	n++;
		106	}
		107	if (win->left + win->width > swidth) {
		108	/* right */
		109	clips[n].c.left = swidth - win->left;
		110	clips[n].c.top = 0;
		111	clips[n].c.width = win->width - clips[n].c.left;
		112	clips[n].c.height = win->height;
		113	n++;
		114	}
		115	if (win->top < 0) {
		116	/* top */
		117	clips[n].c.left = 0;
		118	clips[n].c.top = 0;
		119	clips[n].c.width = win->width;
		120	clips[n].c.height = -win->top;
		121	n++;
		122	}
		123	if (win->top + win->height > sheight) {
		124	/* bottom */
		125	clips[n].c.left = 0;
		126	clips[n].c.top = sheight - win->top;
		127	clips[n].c.width = win->width;
		128	clips[n].c.height = win->height - clips[n].c.top;
		129	n++;
		130	}
		131	return n;
		132	}
		133
		134	int
		135	btcx_align(struct v4l2_rect win, struct v4l2_clip clips, unsigned int n, int mask)
		136	{
		137	s32 nx,nw,dx;
		138	unsigned int i;
		139
		140	/* fixup window */
		141	nx = (win->left + mask) & ~mask;
		142	nw = (win->width) & ~mask;
		143	if (nx + nw > win->left + win->width)
		144	nw -= mask+1;
		145	dx = nx - win->left;
		146	win->left = nx;
		147	win->width = nw;
		148	if (debug)
		149	printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n",
		150	win->width, win->height, win->left, win->top, dx);
		151
		152	/* fixup clips */
		153	for (i = 0; i < n; i++) {
		154	nx = (clips[i].c.left-dx) & ~mask;
		155	nw = (clips[i].c.width) & ~mask;
		156	if (nx + nw < clips[i].c.left-dx + clips[i].c.width)
		157	nw += mask+1;
		158	clips[i].c.left = nx;
		159	clips[i].c.width = nw;
		160	if (debug)
		161	printk(KERN_DEBUG "btcx: clip align %dx%d+%d+%d\n",
		162	clips[i].c.width, clips[i].c.height,
		163	clips[i].c.left, clips[i].c.top);
		164	}
		165	return 0;
		166	}
		167
		168	void
		169	btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips)
		170	{
		171	struct v4l2_clip swap;
		172	int i,j,n;
		173
		174	if (nclips < 2)
		175	return;
		176	for (i = nclips-2; i >= 0; i--) {
		177	for (n = 0, j = 0; j <= i; j++) {
		178	if (clips[j].c.left > clips[j+1].c.left) {
		179	swap = clips[j];
		180	clips[j] = clips[j+1];
		181	clips[j+1] = swap;
		182	n++;
		183	}
		184	}
		185	if (0 == n)
		186	break;
		187	}
		188	}
		189
		190	void
		191	btcx_calc_skips(int line, int width, unsigned int *maxy,
		192	struct btcx_skiplist skips, unsigned int nskips,
		193	const struct v4l2_clip *clips, unsigned int nclips)
		194	{
		195	unsigned int clip,skip;
		196	int end,maxline;
		197
		198	skip=0;
		199	maxline = 9999;
		200	for (clip = 0; clip < nclips; clip++) {
		201
		202	/* sanity checks */
		203	if (clips[clip].c.left + clips[clip].c.width <= 0)
		204	continue;
		205	if (clips[clip].c.left > (signed)width)
		206	break;
		207
		208	/* vertical range */
		209	if (line > clips[clip].c.top+clips[clip].c.height-1)
		210	continue;
		211	if (line < clips[clip].c.top) {
		212	if (maxline > clips[clip].c.top-1)
		213	maxline = clips[clip].c.top-1;
		214	continue;
		215	}
		216	if (maxline > clips[clip].c.top+clips[clip].c.height-1)
		217	maxline = clips[clip].c.top+clips[clip].c.height-1;
		218
		219	/* horizontal range */
		220	if (0 == skip \|\| clips[clip].c.left > skips[skip-1].end) {
		221	/* new one */
		222	skips[skip].start = clips[clip].c.left;
		223	if (skips[skip].start < 0)
		224	skips[skip].start = 0;
		225	skips[skip].end = clips[clip].c.left + clips[clip].c.width;
		226	if (skips[skip].end > width)
		227	skips[skip].end = width;
		228	skip++;
		229	} else {
		230	/* overlaps -- expand last one */
		231	end = clips[clip].c.left + clips[clip].c.width;
		232	if (skips[skip-1].end < end)
		233	skips[skip-1].end = end;
		234	if (skips[skip-1].end > width)
		235	skips[skip-1].end = width;
		236	}
		237	}
		238	*nskips = skip;
		239	*maxy = maxline;
		240
		241	if (debug) {
		242	printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline);
		243	for (skip = 0; skip < *nskips; skip++) {
		244	printk(" %d-%d",skips[skip].start,skips[skip].end);
		245	}
		246	printk("\n");
		247	}
		248	}
		249
		250	/* ---------------------------------------------------------- */
		251
		252	EXPORT_SYMBOL(btcx_riscmem_alloc);
		253	EXPORT_SYMBOL(btcx_riscmem_free);
		254
		255	EXPORT_SYMBOL(btcx_screen_clips);
		256	EXPORT_SYMBOL(btcx_align);
		257	EXPORT_SYMBOL(btcx_sort_clips);
		258	EXPORT_SYMBOL(btcx_calc_skips);
		259
		260	/*
		261	* Local variables:
		262	* c-basic-offset: 8
		263	* End:
		264	*/

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(root)/shark/trunk/drivers/bttv/btcx-risc.c @ 537 - Rev 613