video1394.c

这个是uClinux下的ieee1394驱动

/*
 * video1394.c - video driver for OHCI 1394 boards
 * Copyright (C)1999,2000 Sebastien Rougeaux <[e-mail]>
 *                        Peter Schlaile <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/* jds -- add private data to file to keep track of iso contexts associated
   with each open -- so release won't kill all iso transfers */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/smp_lock.h>
#include <linux/proc_fs.h>
#include <linux/tqueue.h>
#include <linux/delay.h>
#include <linux/devfs_fs_kernel.h>

#include <asm/bitops.h>
#include <linux/types.h>
#include <linux/wrapper.h>
#include <linux/vmalloc.h>
#include <linux/timex.h>
#include <linux/mm.h>

#include "ieee1394.h"
#include "ieee1394_types.h"
#include "hosts.h"
#include "ieee1394_core.h"
#include "highlevel.h"
#include "video1394.h"

#include "ohci1394.h"

#define ISO_CHANNELS 64

#ifndef virt_to_page
#define virt_to_page(x) MAP_NR(x)
#endif

#ifndef vmalloc_32
#define vmalloc_32(x) vmalloc(x)
#endif

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,3))
#define remap_page_range_1394(vma, start, addr, size, prot) \
	remap_page_range(start, addr, size, prot)
#else
#define remap_page_range_1394(vma, start, addr, size, prot) \
	remap_page_range(vma, start, addr, size, prot)
#endif

struct it_dma_prg {
	struct dma_cmd begin;
	quadlet_t data[4];
	struct dma_cmd end;
	quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
};

struct dma_iso_ctx {
	struct ti_ohci *ohci;
	int type; /* OHCI_ISO_TRANSMIT or OHCI_ISO_RECEIVE */
	struct ohci1394_iso_tasklet iso_tasklet;
	int channel;
	int ctx;
	int last_buffer;
	int * next_buffer;  /* For ISO Transmit of video packets
			       to write the correct SYT field
			       into the next block */
	unsigned int num_desc;
	unsigned int buf_size;
	unsigned int frame_size;
	unsigned int packet_size;
	unsigned int left_size;
	unsigned int nb_cmd;
	unsigned char *buf;
        struct dma_cmd **ir_prg;
	struct it_dma_prg **it_prg;
	unsigned int *buffer_status;
        struct timeval *buffer_time; /* time when the buffer was received */
	unsigned int *last_used_cmd; /* For ISO Transmit with 
					variable sized packets only ! */
	int ctrlClear;
	int ctrlSet;
	int cmdPtr;
	int ctxMatch;
	wait_queue_head_t waitq;
	spinlock_t lock;
	unsigned int syt_offset;
	int flags;

	struct list_head link;
};

struct video_card {
	struct ti_ohci *ohci;
	struct list_head list;
	int id;
	devfs_handle_t devfs;
};


struct file_ctx {
	struct video_card *video;
	struct list_head context_list;
	struct dma_iso_ctx *current_ctx;
};

#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
#define VIDEO1394_DEBUG
#endif

#ifdef DBGMSG
#undef DBGMSG
#endif

#ifdef VIDEO1394_DEBUG
#define DBGMSG(card, fmt, args...) \
printk(KERN_INFO "video1394_%d: " fmt "\n" , card , ## args)
#else
#define DBGMSG(card, fmt, args...)
#endif

/* print general (card independent) information */
#define PRINT_G(level, fmt, args...) \
printk(level "video1394: " fmt "\n" , ## args)

/* print card specific information */
#define PRINT(level, card, fmt, args...) \
printk(level "video1394_%d: " fmt "\n" , card , ## args)

void wakeup_dma_ir_ctx(unsigned long l);
void wakeup_dma_it_ctx(unsigned long l);

static LIST_HEAD(video1394_cards);
static spinlock_t video1394_cards_lock = SPIN_LOCK_UNLOCKED;

static devfs_handle_t devfs_handle;
static struct hpsb_highlevel *hl_handle = NULL;

/* Code taken from bttv.c */

/*******************************/
/* Memory management functions */
/*******************************/

static inline unsigned long kvirt_to_bus(unsigned long adr) 
{
	unsigned long kva, ret;

	kva = (unsigned long) page_address(vmalloc_to_page((void *)adr));
	kva |= adr & (PAGE_SIZE-1); /* restore the offset */
	ret = virt_to_bus((void *)kva);
	return ret;
}

/* Here we want the physical address of the memory.
 * This is used when initializing the contents of the area.
 */
static inline unsigned long kvirt_to_pa(unsigned long adr) 
{
        unsigned long kva, ret;

	kva = (unsigned long) page_address(vmalloc_to_page((void *)adr));
	kva |= adr & (PAGE_SIZE-1); /* restore the offset */
	ret = __pa(kva);
        return ret;
}

static void * rvmalloc(unsigned long size)
{
	void * mem;
	unsigned long adr;

	size=PAGE_ALIGN(size);
	mem=vmalloc_32(size);
	if (mem) 
	{
		memset(mem, 0, size); /* Clear the ram out, 
					 no junk to the user */
	        adr=(unsigned long) mem;
		while (size > 0) 
                {
			mem_map_reserve(vmalloc_to_page((void *)adr));
			adr+=PAGE_SIZE;
			size-=PAGE_SIZE;
		}
	}
	return mem;
}

static void rvfree(void * mem, unsigned long size)
{
        unsigned long adr;

	if (mem) 
	{
	        adr=(unsigned long) mem;
		while ((long) size > 0) 
                {
			mem_map_unreserve(vmalloc_to_page((void *)adr));
			adr+=PAGE_SIZE;
			size-=PAGE_SIZE;
		}
		vfree(mem);
	}
}
/* End of code taken from bttv.c */

static int free_dma_iso_ctx(struct dma_iso_ctx *d)
{
	int i;
	
	DBGMSG(d->ohci->id, "Freeing dma_iso_ctx %d", d->ctx);

	ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
	if (d->iso_tasklet.link.next != NULL)
		ohci1394_unregister_iso_tasklet(d->ohci, &d->iso_tasklet);

	if (d->buf)
		rvfree((void *)d->buf, d->num_desc * d->buf_size);

	if (d->ir_prg) {
		for (i=0;i<d->num_desc;i++) 
			if (d->ir_prg[i]) kfree(d->ir_prg[i]);
		kfree(d->ir_prg);
	}

	if (d->it_prg) {
		for (i=0;i<d->num_desc;i++) 
			if (d->it_prg[i]) kfree(d->it_prg[i]);
		kfree(d->it_prg);
	}

	if (d->buffer_status)
		kfree(d->buffer_status);
	if (d->buffer_time)
		kfree(d->buffer_time);
	if (d->last_used_cmd)
		kfree(d->last_used_cmd);
	if (d->next_buffer)
		kfree(d->next_buffer);

	list_del(&d->link);

	kfree(d);

	return 0;
}

static struct dma_iso_ctx *
alloc_dma_iso_ctx(struct ti_ohci *ohci, int type, int num_desc,
		  int buf_size, int channel, unsigned int packet_size)
{
	struct dma_iso_ctx *d;
	int i;

	d = kmalloc(sizeof(struct dma_iso_ctx), GFP_KERNEL);
	if (d == NULL) {
		PRINT(KERN_ERR, ohci->id, "Failed to allocate dma_iso_ctx");
		return NULL;
	}

	memset(d, 0, sizeof *d);

	d->ohci = ohci;
	d->type = type;
	d->channel = channel;
	d->num_desc = num_desc;
	d->frame_size = buf_size;
	d->buf_size = PAGE_ALIGN(buf_size);
	d->last_buffer = -1;
	d->buf = NULL;
	d->ir_prg = NULL;
	init_waitqueue_head(&d->waitq);

	d->buf = rvmalloc(d->num_desc * d->buf_size);

	if (d->buf == NULL) {
		PRINT(KERN_ERR, ohci->id, "Failed to allocate dma buffer");
		free_dma_iso_ctx(d);
		return NULL;
	}
	memset(d->buf, 0, d->num_desc * d->buf_size);

	if (type == OHCI_ISO_RECEIVE)
		ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
					  wakeup_dma_ir_ctx,
					  (unsigned long) d);
	else
		ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
					  wakeup_dma_it_ctx,
					  (unsigned long) d);

	if (ohci1394_register_iso_tasklet(ohci, &d->iso_tasklet) < 0) {
		PRINT(KERN_ERR, ohci->id, "no free iso %s contexts",
		      type == OHCI_ISO_RECEIVE ? "receive" : "transmit");
		free_dma_iso_ctx(d);
		return NULL;
	}
	d->ctx = d->iso_tasklet.context;

	if (type == OHCI_ISO_RECEIVE) {
		d->ctrlSet = OHCI1394_IsoRcvContextControlSet+32*d->ctx;
		d->ctrlClear = OHCI1394_IsoRcvContextControlClear+32*d->ctx;
		d->cmdPtr = OHCI1394_IsoRcvCommandPtr+32*d->ctx;
		d->ctxMatch = OHCI1394_IsoRcvContextMatch+32*d->ctx;

		d->ir_prg = kmalloc(d->num_desc * sizeof(struct dma_cmd *), 
				    GFP_KERNEL);

		if (d->ir_prg == NULL) {
			PRINT(KERN_ERR, ohci->id, 
			      "Failed to allocate dma ir prg");
			free_dma_iso_ctx(d);
			return NULL;
		}
		memset(d->ir_prg, 0, d->num_desc * sizeof(struct dma_cmd *));
	
		d->nb_cmd = d->buf_size / PAGE_SIZE + 1;
		d->left_size = (d->frame_size % PAGE_SIZE) ?
			d->frame_size % PAGE_SIZE : PAGE_SIZE;
 
		for (i=0;i<d->num_desc;i++) {
			d->ir_prg[i] = kmalloc(d->nb_cmd * 
					       sizeof(struct dma_cmd), 
					       GFP_KERNEL);
			if (d->ir_prg[i] == NULL) {
				PRINT(KERN_ERR, ohci->id, 
				      "Failed to allocate dma ir prg");
				free_dma_iso_ctx(d);
				return NULL;
			}
		}

	}
	else {  /* OHCI_ISO_TRANSMIT */
		d->ctrlSet = OHCI1394_IsoXmitContextControlSet+16*d->ctx;
		d->ctrlClear = OHCI1394_IsoXmitContextControlClear+16*d->ctx;
		d->cmdPtr = OHCI1394_IsoXmitCommandPtr+16*d->ctx;

		d->it_prg = kmalloc(d->num_desc * sizeof(struct it_dma_prg *), 
				    GFP_KERNEL);

		if (d->it_prg == NULL) {
			PRINT(KERN_ERR, ohci->id, 
			      "Failed to allocate dma it prg");
			free_dma_iso_ctx(d);
			return NULL;
		}
		memset(d->it_prg, 0, d->num_desc*sizeof(struct it_dma_prg *));
		
		d->packet_size = packet_size;

		if (PAGE_SIZE % packet_size || packet_size>4096) {
			PRINT(KERN_ERR, ohci->id, 
			      "Packet size %d (page_size: %ld) "
			      "not yet supported\n",
			      packet_size, PAGE_SIZE);
			free_dma_iso_ctx(d);
			return NULL;
		}

		d->nb_cmd = d->frame_size / d->packet_size;
		if (d->frame_size % d->packet_size) {
			d->nb_cmd++;
			d->left_size = d->frame_size % d->packet_size;
		}
		else
			d->left_size = d->packet_size;

		for (i=0;i<d->num_desc;i++) {
			d->it_prg[i] = kmalloc(d->nb_cmd * 
					       sizeof(struct it_dma_prg), 
					       GFP_KERNEL);
			if (d->it_prg[i] == NULL) {
				PRINT(KERN_ERR, ohci->id, 
				      "Failed to allocate dma it prg");
				free_dma_iso_ctx(d);
				return NULL;
			}
		}
	}

	d->buffer_status = kmalloc(d->num_desc * sizeof(unsigned int),
				   GFP_KERNEL);
	d->buffer_time = kmalloc(d->num_desc * sizeof(struct timeval),
				   GFP_KERNEL);
	d->last_used_cmd = kmalloc(d->num_desc * sizeof(unsigned int),
				   GFP_KERNEL);
	d->next_buffer = kmalloc(d->num_desc * sizeof(int),
				 GFP_KERNEL);

	if (d->buffer_status == NULL) {
		PRINT(KERN_ERR, ohci->id, "Failed to allocate buffer_status");
		free_dma_iso_ctx(d);
		return NULL;
	}
	if (d->buffer_time == NULL) {
		PRINT(KERN_ERR, ohci->id, "Failed to allocate buffer_time");
		free_dma_iso_ctx(d);
		return NULL;
	}
	if (d->last_used_cmd == NULL) {
		PRINT(KERN_ERR, ohci->id, "Failed to allocate last_used_cmd");
		free_dma_iso_ctx(d);
		return NULL;
	}
	if (d->next_buffer == NULL) {
		PRINT(KERN_ERR, ohci->id, "Failed to allocate next_buffer");
		free_dma_iso_ctx(d);
		return NULL;
	}
	memset(d->buffer_status, 0, d->num_desc * sizeof(unsigned int));
	memset(d->buffer_time, 0, d->num_desc * sizeof(struct timeval));
	memset(d->last_used_cmd, 0, d->num_desc * sizeof(unsigned int));
	memset(d->next_buffer, -1, d->num_desc * sizeof(int));
	
        spin_lock_init(&d->lock);

	PRINT(KERN_INFO, ohci->id, "Iso %s DMA: %d buffers "
	      "of size %d allocated for a frame size %d, each with %d prgs",
	      (type == OHCI_ISO_RECEIVE) ? "receive" : "transmit",
	      d->num_desc, d->buf_size, d->frame_size, d->nb_cmd);

	return d;
}

static void reset_ir_status(struct dma_iso_ctx *d, int n)
{
	int i;
	d->ir_prg[n][0].status = cpu_to_le32(4);
	d->ir_prg[n][1].status = cpu_to_le32(PAGE_SIZE-4);
	for (i=2;i<d->nb_cmd-1;i++)
		d->ir_prg[n][i].status = cpu_to_le32(PAGE_SIZE);
	d->ir_prg[n][i].status = cpu_to_le32(d->left_size);
}

static void initialize_dma_ir_prg(struct dma_iso_ctx *d, int n, int flags)
{
	struct dma_cmd *ir_prg = d->ir_prg[n];
	unsigned long buf = (unsigned long)d->buf+n*d->buf_size;
	int i;

	/* the first descriptor will read only 4 bytes */
	ir_prg[0].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
		DMA_CTL_BRANCH | 4);

	/* set the sync flag */
	if (flags & VIDEO1394_SYNC_FRAMES)
		ir_prg[0].control |= cpu_to_le32(DMA_CTL_WAIT);

	ir_prg[0].address = cpu_to_le32(kvirt_to_bus(buf));
	ir_prg[0].branchAddress =  cpu_to_le32((virt_to_bus(&(ir_prg[1].control)) 
				    & 0xfffffff0) | 0x1);

	/* the second descriptor will read PAGE_SIZE-4 bytes */
	ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
		DMA_CTL_BRANCH | (PAGE_SIZE-4));
	ir_prg[1].address = cpu_to_le32(kvirt_to_bus(buf+4));
	ir_prg[1].branchAddress =  cpu_to_le32((virt_to_bus(&(ir_prg[2].control)) 
				    & 0xfffffff0) | 0x1);
	
	for (i=2;i<d->nb_cmd-1;i++) {
		ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE | 
			DMA_CTL_BRANCH | PAGE_SIZE);
		ir_prg[i].address = cpu_to_le32(kvirt_to_bus(buf+(i-1)*PAGE_SIZE));

		ir_prg[i].branchAddress =  
			cpu_to_le32((virt_to_bus(&(ir_prg[i+1].control))