ohci1394.h

Ieee1394驱动实现

/*
 * ohci1394.h - driver for OHCI 1394 boards
 * Copyright (C)1999,2000 Sebastien Rougeaux <[e-mail]>
 *                        Gord Peters <[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.
 */

#ifndef _OHCI1394_H
#define _OHCI1394_H

#include "ieee1394_types.h"
#include <asm/io.h>

#define OHCI1394_DRIVER_NAME      "ohci1394"

#define OHCI1394_MAX_AT_REQ_RETRIES	0x2
#define OHCI1394_MAX_AT_RESP_RETRIES	0x2
#define OHCI1394_MAX_PHYS_RESP_RETRIES	0x8
#define OHCI1394_MAX_SELF_ID_ERRORS	16

#define AR_REQ_NUM_DESC		4		/* number of AR req descriptors */
#define AR_REQ_BUF_SIZE		PAGE_SIZE	/* size of AR req buffers */
#define AR_REQ_SPLIT_BUF_SIZE	PAGE_SIZE	/* split packet buffer */

#define AR_RESP_NUM_DESC	4		/* number of AR resp descriptors */
#define AR_RESP_BUF_SIZE	PAGE_SIZE	/* size of AR resp buffers */
#define AR_RESP_SPLIT_BUF_SIZE	PAGE_SIZE	/* split packet buffer */

#define IR_NUM_DESC		16		/* number of IR descriptors */
#define IR_BUF_SIZE		PAGE_SIZE	/* 4096 bytes/buffer */
#define IR_SPLIT_BUF_SIZE	PAGE_SIZE	/* split packet buffer */

#define IT_NUM_DESC		16	/* number of IT descriptors */

#define AT_REQ_NUM_DESC		32	/* number of AT req descriptors */
#define AT_RESP_NUM_DESC	32	/* number of AT resp descriptors */

#define OHCI_LOOP_COUNT		100	/* Number of loops for reg read waits */

#define OHCI_CONFIG_ROM_LEN	1024	/* Length of the mapped configrom space */

#define OHCI1394_SI_DMA_BUF_SIZE	8192 /* length of the selfid buffer */

/* PCI configuration space addresses */
#define OHCI1394_PCI_HCI_Control 0x40

struct dma_cmd {
        u32 control;
        u32 address;
        u32 branchAddress;
        u32 status;
};

/*
 * FIXME:
 * It is important that a single at_dma_prg does not cross a page boundary
 * The proper way to do it would be to do the check dynamically as the
 * programs are inserted into the AT fifo.
 */
struct at_dma_prg {
	struct dma_cmd begin;
	quadlet_t data[4];
	struct dma_cmd end;
	quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
};

/* identify whether a DMA context is asynchronous or isochronous */
enum context_type { DMA_CTX_ASYNC_REQ, DMA_CTX_ASYNC_RESP, DMA_CTX_ISO };

/* DMA receive context */
struct dma_rcv_ctx {
	struct ti_ohci *ohci;
	enum context_type type;
	int ctx;
	unsigned int num_desc;

	unsigned int buf_size;
	unsigned int split_buf_size;

	/* dma block descriptors */
        struct dma_cmd **prg_cpu;
        dma_addr_t *prg_bus;
	struct pci_pool *prg_pool;

	/* dma buffers */
        quadlet_t **buf_cpu;
        dma_addr_t *buf_bus;

        unsigned int buf_ind;
        unsigned int buf_offset;
        quadlet_t *spb;
        spinlock_t lock;
        struct tasklet_struct task;
	int ctrlClear;
	int ctrlSet;
	int cmdPtr;
	int ctxtMatch;
};

/* DMA transmit context */
struct dma_trm_ctx {
	struct ti_ohci *ohci;
	enum context_type type;
	int ctx;
	unsigned int num_desc;

	/* dma block descriptors */
        struct at_dma_prg **prg_cpu;
	dma_addr_t *prg_bus;
	struct pci_pool *prg_pool;

        unsigned int prg_ind;
        unsigned int sent_ind;
	int free_prgs;
        quadlet_t *branchAddrPtr;

	/* list of packets inserted in the AT FIFO */
	struct list_head fifo_list;

	/* list of pending packets to be inserted in the AT FIFO */
	struct list_head pending_list;

        spinlock_t lock;
        struct tasklet_struct task;
	int ctrlClear;
	int ctrlSet;
	int cmdPtr;
};

struct ohci1394_iso_tasklet {
	struct tasklet_struct tasklet;
	struct list_head link;
	int context;
	enum { OHCI_ISO_TRANSMIT, OHCI_ISO_RECEIVE,
	       OHCI_ISO_MULTICHANNEL_RECEIVE } type;
};

struct ti_ohci {
        struct pci_dev *dev;

	enum {
		OHCI_INIT_ALLOC_HOST,
		OHCI_INIT_HAVE_MEM_REGION,
		OHCI_INIT_HAVE_IOMAPPING,
		OHCI_INIT_HAVE_CONFIG_ROM_BUFFER,
		OHCI_INIT_HAVE_SELFID_BUFFER,
		OHCI_INIT_HAVE_TXRX_BUFFERS__MAYBE,
		OHCI_INIT_HAVE_IRQ,
		OHCI_INIT_DONE,
	} init_state;

        /* remapped memory spaces */
        void __iomem *registers;

	/* dma buffer for self-id packets */
        quadlet_t *selfid_buf_cpu;
        dma_addr_t selfid_buf_bus;

	/* buffer for csr config rom */
        quadlet_t *csr_config_rom_cpu;
        dma_addr_t csr_config_rom_bus;
	int csr_config_rom_length;

	unsigned int max_packet_size;

        /* async receive */
	struct dma_rcv_ctx ar_resp_context;
	struct dma_rcv_ctx ar_req_context;

	/* async transmit */
	struct dma_trm_ctx at_resp_context;
	struct dma_trm_ctx at_req_context;

        /* iso receive */
	int nb_iso_rcv_ctx;
	unsigned long ir_ctx_usage; /* use test_and_set_bit() for atomicity */
	unsigned long ir_multichannel_used; /* ditto */
        spinlock_t IR_channel_lock;

        /* iso transmit */
	int nb_iso_xmit_ctx;
	unsigned long it_ctx_usage; /* use test_and_set_bit() for atomicity */

        u64 ISO_channel_usage;

        /* IEEE-1394 part follows */
        struct hpsb_host *host;

        int phyid, isroot;

        spinlock_t phy_reg_lock;
	spinlock_t event_lock;

	int self_id_errors;

	/* Tasklets for iso receive and transmit, used by video1394
	 * and dv1394 */
	struct list_head iso_tasklet_list;
	spinlock_t iso_tasklet_list_lock;

	/* Swap the selfid buffer? */
	unsigned int selfid_swap:1;
	/* Some Apple chipset seem to swap incoming headers for us */
	unsigned int no_swap_incoming:1;

	/* Force extra paranoia checking on bus-reset handling */
	unsigned int check_busreset:1;
};

static inline int cross_bound(unsigned long addr, unsigned int size)
{
	if (size == 0)
		return 0;

	if (size > PAGE_SIZE)