WebSVN - shark - Blame - Rev 537 - /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	{
		54	if (NULL == risc->cpu)
		55	return;
		56	pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
537	giacomo	57	vfree_32((void *)risc->cpu);
481	giacomo	58	memset(risc,0,sizeof(*risc));
		59	if (debug) {
		60	memcnt--;
		61	printk("btcx: riscmem free [%d]\n",memcnt);
		62	}
		63	}
		64
		65	int btcx_riscmem_alloc(struct pci_dev *pci,
		66	struct btcx_riscmem *risc,
		67	unsigned int size)
		68	{
		69	u32 *cpu;
		70	dma_addr_t dma;
		71
		72	if (NULL != risc->cpu && risc->size < size)
		73	btcx_riscmem_free(pci,risc);
		74	if (NULL == risc->cpu) {
		75	cpu = pci_alloc_consistent(pci, size, &dma);
		76	if (NULL == cpu)
		77	return -ENOMEM;
		78	risc->cpu = cpu;
		79	risc->dma = dma;
		80	risc->size = size;
		81	if (debug) {
		82	memcnt++;
		83	printk("btcx: riscmem alloc size=%d [%d]\n",size,memcnt);
		84	}
		85	}
		86	memset(risc->cpu,0,risc->size);
		87	return 0;
		88	}
		89
		90	/* ---------------------------------------------------------- */
		91	/* screen overlay helpers */
		92
		93	int
		94	btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win,
		95	struct v4l2_clip *clips, unsigned int n)
		96	{
		97	if (win->left < 0) {
		98	/* left */
		99	clips[n].c.left = 0;
		100	clips[n].c.top = 0;
		101	clips[n].c.width = -win->left;
		102	clips[n].c.height = win->height;
		103	n++;
		104	}
		105	if (win->left + win->width > swidth) {
		106	/* right */
		107	clips[n].c.left = swidth - win->left;
		108	clips[n].c.top = 0;
		109	clips[n].c.width = win->width - clips[n].c.left;
		110	clips[n].c.height = win->height;
		111	n++;
		112	}
		113	if (win->top < 0) {
		114	/* top */
		115	clips[n].c.left = 0;
		116	clips[n].c.top = 0;
		117	clips[n].c.width = win->width;
		118	clips[n].c.height = -win->top;
		119	n++;
		120	}
		121	if (win->top + win->height > sheight) {
		122	/* bottom */
		123	clips[n].c.left = 0;
		124	clips[n].c.top = sheight - win->top;
		125	clips[n].c.width = win->width;
		126	clips[n].c.height = win->height - clips[n].c.top;
		127	n++;
		128	}
		129	return n;
		130	}
		131
		132	int
		133	btcx_align(struct v4l2_rect win, struct v4l2_clip clips, unsigned int n, int mask)
		134	{
		135	s32 nx,nw,dx;
		136	unsigned int i;
		137
		138	/* fixup window */
		139	nx = (win->left + mask) & ~mask;
		140	nw = (win->width) & ~mask;
		141	if (nx + nw > win->left + win->width)
		142	nw -= mask+1;
		143	dx = nx - win->left;
		144	win->left = nx;
		145	win->width = nw;
		146	if (debug)
		147	printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n",
		148	win->width, win->height, win->left, win->top, dx);
		149
		150	/* fixup clips */
		151	for (i = 0; i < n; i++) {
		152	nx = (clips[i].c.left-dx) & ~mask;
		153	nw = (clips[i].c.width) & ~mask;
		154	if (nx + nw < clips[i].c.left-dx + clips[i].c.width)
		155	nw += mask+1;
		156	clips[i].c.left = nx;
		157	clips[i].c.width = nw;
		158	if (debug)
		159	printk(KERN_DEBUG "btcx: clip align %dx%d+%d+%d\n",
		160	clips[i].c.width, clips[i].c.height,
		161	clips[i].c.left, clips[i].c.top);
		162	}
		163	return 0;
		164	}
		165
		166	void
		167	btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips)
		168	{
		169	struct v4l2_clip swap;
		170	int i,j,n;
		171
		172	if (nclips < 2)
		173	return;
		174	for (i = nclips-2; i >= 0; i--) {
		175	for (n = 0, j = 0; j <= i; j++) {
		176	if (clips[j].c.left > clips[j+1].c.left) {
		177	swap = clips[j];
		178	clips[j] = clips[j+1];
		179	clips[j+1] = swap;
		180	n++;
		181	}
		182	}
		183	if (0 == n)
		184	break;
		185	}
		186	}
		187
		188	void
		189	btcx_calc_skips(int line, int width, unsigned int *maxy,
		190	struct btcx_skiplist skips, unsigned int nskips,
		191	const struct v4l2_clip *clips, unsigned int nclips)
		192	{
		193	unsigned int clip,skip;
		194	int end,maxline;
		195
		196	skip=0;
		197	maxline = 9999;
		198	for (clip = 0; clip < nclips; clip++) {
		199
		200	/* sanity checks */
		201	if (clips[clip].c.left + clips[clip].c.width <= 0)
		202	continue;
		203	if (clips[clip].c.left > (signed)width)
		204	break;
		205
		206	/* vertical range */
		207	if (line > clips[clip].c.top+clips[clip].c.height-1)
		208	continue;
		209	if (line < clips[clip].c.top) {
		210	if (maxline > clips[clip].c.top-1)
		211	maxline = clips[clip].c.top-1;
		212	continue;
		213	}
		214	if (maxline > clips[clip].c.top+clips[clip].c.height-1)
		215	maxline = clips[clip].c.top+clips[clip].c.height-1;
		216
		217	/* horizontal range */
		218	if (0 == skip \|\| clips[clip].c.left > skips[skip-1].end) {
		219	/* new one */
		220	skips[skip].start = clips[clip].c.left;
		221	if (skips[skip].start < 0)
		222	skips[skip].start = 0;
		223	skips[skip].end = clips[clip].c.left + clips[clip].c.width;
		224	if (skips[skip].end > width)
		225	skips[skip].end = width;
		226	skip++;
		227	} else {
		228	/* overlaps -- expand last one */
		229	end = clips[clip].c.left + clips[clip].c.width;
		230	if (skips[skip-1].end < end)
		231	skips[skip-1].end = end;
		232	if (skips[skip-1].end > width)
		233	skips[skip-1].end = width;
		234	}
		235	}
		236	*nskips = skip;
		237	*maxy = maxline;
		238
		239	if (debug) {
		240	printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline);
		241	for (skip = 0; skip < *nskips; skip++) {
		242	printk(" %d-%d",skips[skip].start,skips[skip].end);
		243	}
		244	printk("\n");
		245	}
		246	}
		247
		248	/* ---------------------------------------------------------- */
		249
		250	EXPORT_SYMBOL(btcx_riscmem_alloc);
		251	EXPORT_SYMBOL(btcx_riscmem_free);
		252
		253	EXPORT_SYMBOL(btcx_screen_clips);
		254	EXPORT_SYMBOL(btcx_align);
		255	EXPORT_SYMBOL(btcx_sort_clips);
		256	EXPORT_SYMBOL(btcx_calc_skips);
		257
		258	/*
		259	* Local variables:
		260	* c-basic-offset: 8
		261	* End:
		262	*/

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