vino.c
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上传日期:2013-02-24
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- /* $Id: vino.c,v 1.5 1999/10/09 00:01:14 ralf Exp $
- * 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/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 __attribute__ ((aligned (64)));
- unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
- unsigned long flags;
- save_and_cli(flags);
- __asm__ __volatile__(
- ".settmips3nt"
- ".settnoatnt"
- "ldt$1,(%0)nt"
- "sdt$1,(%1)nt"
- ".settatnt"
- ".settmips0"
- :
- :"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__(
- ".settmips3nt"
- ".settnoatnt"
- "ldt$1,(%0)nt"
- "sdt$1,(%1)nt"
- ".settatnt"
- ".settmips0"
- :
- :"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__(
- ".settmips3nt"
- ".settnoatnt"
- "ldt$1,(%0)nt"
- "ldt$2,(%1)nt"
- "andt$1,$1,$2nt"
- "sdt$1,(%0)nt"
- ".settatnt"
- ".settmips0"
- :
- :"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__(
- ".settmips3nt"
- ".settnoatnt"
- "ldt$1,(%0)nt"
- "ldt$2,(%1)nt"
- "ort$1,$1,$2nt"
- "sdt$1,(%0)nt"
- ".settatnt"
- ".settmips0"
- :
- :"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;
- unsigned long long foo;
- unsigned long *bar;
- bar = (unsigned long *) &foo;
- ret = vino_reg_read(VINO_REVID);
- rev = (ret & VINO_REVID_REV_MASK);
- id = (ret & VINO_REVID_ID_MASK) >> 4;
- printk("Vino: ID:%02hx Rev:%02hxn", id, rev);
- foo = vino_reg_read(VINO_A_DESC_DATA0);
- printk("0x%lx", bar[0]);
- printk("%lx ", bar[1]);
- foo = vino_reg_read(VINO_A_DESC_DATA1);
- printk("0x%lx", bar[0]);
- printk("%lx ", bar[1]);
- foo = vino_reg_read(VINO_A_DESC_DATA2);
- printk("0x%lx", bar[0]);
- printk("%lx ", bar[1]);
- foo = vino_reg_read(VINO_A_DESC_DATA3);
- printk("0x%lx", bar[0]);
- printk("%lxn", bar[1]);
- foo = vino_reg_read(VINO_B_DESC_DATA0);
- printk("0x%lx", bar[0]);
- printk("%lx ", bar[1]);
- foo = vino_reg_read(VINO_B_DESC_DATA1);
- printk("0x%lx", bar[0]);
- printk("%lx ", bar[1]);
- foo = vino_reg_read(VINO_B_DESC_DATA2);
- printk("0x%lx", bar[0]);
- printk("%lx ", bar[1]);
- foo = vino_reg_read(VINO_B_DESC_DATA3);
- printk("0x%lx", bar[0]);
- printk("%lxn", bar[1]);
- 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)
- {
- return 0;
- }
- static void vino_close(struct video_device *dev)
- {
- }
- 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 = {
- owner: THIS_MODULE,
- name: "Vino IndyCam/TV",
- type: VID_TYPE_CAPTURE,
- hardware: VID_HARDWARE_VINO,
- open: vino_open,
- close: vino_close,
- ioctl: vino_ioctl,
- mmap: vino_mmap,
- };
- int __init 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