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|
/* $Id$
* drivers/char/vino.c
*
* (incomplete) Driver for the Vino Video input system found in SGI Indys.
*
* Copyright (C) 1999 Ulf Carlsson (ulfc@bun.falkenberg.se)
*
* This isn't complete yet, please don't expect any video until I've written
* some more code.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/videodev.h>
#include <asm/addrspace.h>
#include <asm/system.h>
#include "vino.h"
struct vino_device {
struct video_device vdev;
unsigned long chan;
#define VINO_CHAN_A 0
#define VINO_CHAN_B 1
unsigned long flags;
#define VINO_DMA_ACTIVE (1<<0)
};
/* We can actually receive TV and IndyCam input at the same time. Believe it or
* not..
*/
static struct vino_device vino[2];
/* Those registers have to be accessed by either *one* 64 bit write or *one* 64
* bit read. We need some asm to fix this. We can't use mips3 as standard
* because we just save 32 bits at context switch.
*/
static __inline__ unsigned long long vino_reg_read(unsigned long addr)
{
unsigned long long ret;
unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
unsigned long flags;
save_and_cli(flags);
__asm__ __volatile__(
".set\tmips3\n\t"
".set\tnoat\n\t"
"ld\t$1,(%0)\n\t"
"sd\t$1,(%1)\n\t"
".set\tat\n\t"
".set\tmips0"
:
:"r" (virt_addr),
"r" (&ret)
:"$1");
restore_flags(flags);
return ret;
}
static __inline__ void vino_reg_write(unsigned long long value,
unsigned long addr)
{
unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
unsigned long flags;
/* we might lose the upper parts of the registers which are not saved
* if there comes an interrupt in our way, play safe */
save_and_cli(flags);
__asm__ __volatile__(
".set\tmips3\n\t"
".set\tnoat\n\t"
"ld\t$1,(%0)\n\t"
"sd\t$1,(%1)\n\t"
".set\tat\n\t"
".set\tmips0"
:
:"r" (&value),
"r" (virt_addr)
:"$1");
restore_flags(flags);
}
static __inline__ void vino_reg_and(unsigned long long value,
unsigned long addr)
{
unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
unsigned long flags;
save_and_cli(flags);
__asm__ __volatile__(
".set\tmips3\n\t"
".set\tnoat\n\t"
"ld\t$1,(%0)\n\t"
"ld\t$2,(%1)\n\t"
"and\t$1,$1,$2\n\t"
"sd\t$1,(%0)\n\t"
".set\tat\n\t"
".set\tmips0"
:
:"r" (virt_addr),
"r" (&value)
:"$1","$2");
restore_flags(flags);
}
static __inline__ void vino_reg_or(unsigned long long value,
unsigned long addr)
{
unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
unsigned long flags;
save_and_cli(flags);
__asm__ __volatile__(
".set\tmips3\n\t"
".set\tnoat\n\t"
"ld\t$1,(%0)\n\t"
"ld\t$2,(%1)\n\t"
"or\t$1,$1,$2\n\t"
"sd\t$1,(%0)\n\t"
".set\tat\n\t"
".set\tmips0"
:
:"r" (virt_addr),
"r" (&value)
:"$1","$2");
restore_flags(flags);
}
static int vino_dma_setup(void)
{
return 0;
}
static void vino_dma_stop(void)
{
}
static int vino_init(void)
{
unsigned long ret;
unsigned short rev, id;
ret = vino_reg_read(VINO_REVID);
rev = (ret & VINO_REVID_REV_MASK);
id = (ret & VINO_REVID_ID_MASK) >> 4;
printk("Vino: ID:%02hx Rev:%02hx\n", id, rev);
return 0;
}
static void vino_dma_go(struct vino_device *v)
{
}
/* Reset the vino back to default state */
static void vino_setup(struct vino_device *v)
{
}
static int vino_open(struct video_device *dev, int flags)
{
MOD_INC_USE_COUNT;
return 0;
}
static void vino_close(struct video_device *dev)
{
MOD_DEC_USE_COUNT;
}
static int vino_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
return 0;
}
static int vino_mmap(struct video_device *dev, const char *adr,
unsigned long size)
{
return 0;
}
static struct video_device vino_dev = {
"Vino IndyCam/TV",
VID_TYPE_CAPTURE,
VID_HARDWARE_VINO,
vino_open,
vino_close,
NULL, /* vino_read */
NULL, /* vino_write */
NULL, /* vino_poll */
vino_ioctl,
vino_mmap,
NULL, /* vino_init */
NULL,
0,
0
};
__initfunc(int init_vino(struct video_device *dev))
{
int err;
err = vino_init();
if (err)
return err;
#if 0
if (video_register_device(&vinodev, VFL_TYPE_GRABBER) == -1) {
return -ENODEV;
}
#endif
return 0;
}
#ifdef MODULE
int init_module(void)
{
int err;
err = vino_init();
if (err)
return err;
return 0;
}
void cleanup_module(void)
{
}
#endif
|
