path: root/drivers/rapidio/rio-scan.c

/*
 * RapidIO enumeration and discovery support
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * Copyright 2009 Integrated Device Technology, Inc.
 * Alex Bounine <alexandre.bounine@idt.com>
 * - Added Port-Write/Error Management initialization and handling
 *
 * Copyright 2009 Sysgo AG
 * Thomas Moll <thomas.moll@sysgo.com>
 * - Added Input- Output- enable functionality, to allow full communication
 *
 * 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.
 */

#include <linux/types.h>
#include <linux/kernel.h>

#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/rio_ids.h>
#include <linux/rio_regs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/slab.h>

#include "rio.h"

LIST_HEAD(rio_devices);
static LIST_HEAD(rio_switches);

static void rio_enum_timeout(unsigned long);

static void rio_init_em(struct rio_dev *rdev);

DEFINE_SPINLOCK(rio_global_list_lock);

static int next_destid = 0;
static int next_switchid = 0;
static int next_net = 0;
static int next_comptag = 1;

static struct timer_list rio_enum_timer =
TIMER_INITIALIZER(rio_enum_timeout, 0, 0);

static int rio_mport_phys_table[] = {
	RIO_EFB_PAR_EP_ID,
	RIO_EFB_PAR_EP_REC_ID,
	RIO_EFB_SER_EP_ID,
	RIO_EFB_SER_EP_REC_ID,
	-1,
};

/**
 * rio_get_device_id - Get the base/extended device id for a device
 * @port: RIO master port
 * @destid: Destination ID of device
 * @hopcount: Hopcount to device
 *
 * Reads the base/extended device id from a device. Returns the
 * 8/16-bit device ID.
 */
static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
{
	u32 result;

	rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);

	return RIO_GET_DID(port->sys_size, result);
}

/**
 * rio_set_device_id - Set the base/extended device id for a device
 * @port: RIO master port
 * @destid: Destination ID of device
 * @hopcount: Hopcount to device
 * @did: Device ID value to be written
 *
 * Writes the base/extended device id from a device.
 */
static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
{
	rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
				  RIO_SET_DID(port->sys_size, did));
}

/**
 * rio_local_set_device_id - Set the base/extended device id for a port
 * @port: RIO master port
 * @did: Device ID value to be written
 *
 * Writes the base/extended device id from a device.
 */
static void rio_local_set_device_id(struct rio_mport *port, u16 did)
{
	rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
				did));
}

/**
 * rio_clear_locks- Release all host locks and signal enumeration complete
 * @port: Master port to issue transaction
 *
 * Marks the component tag CSR on each device with the enumeration
 * complete flag. When complete, it then release the host locks on
 * e