path: root/drivers/net/chelsio/subr.c

/*****************************************************************************
 *                                                                           *
 * File: subr.c                                                              *
 * $Revision: 1.27 $                                                         *
 * $Date: 2005/06/22 01:08:36 $                                              *
 * Description:                                                              *
 *  Various subroutines (intr,pio,etc.) used by Chelsio 10G Ethernet driver. *
 *  part of the Chelsio 10Gb Ethernet Driver.                                *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the GNU General Public License, version 2, as       *
 * published by the Free Software Foundation.                                *
 *                                                                           *
 * 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.                 *
 *                                                                           *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED    *
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF      *
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.                     *
 *                                                                           *
 * http://www.chelsio.com                                                    *
 *                                                                           *
 * Copyright (c) 2003 - 2005 Chelsio Communications, Inc.                    *
 * All rights reserved.                                                      *
 *                                                                           *
 * Maintainers: maintainers@chelsio.com                                      *
 *                                                                           *
 * Authors: Dimitrios Michailidis   <dm@chelsio.com>                         *
 *          Tina Yang               <tainay@chelsio.com>                     *
 *          Felix Marti             <felix@chelsio.com>                      *
 *          Scott Bardone           <sbardone@chelsio.com>                   *
 *          Kurt Ottaway            <kottaway@chelsio.com>                   *
 *          Frank DiMambro          <frank@chelsio.com>                      *
 *                                                                           *
 * History:                                                                  *
 *                                                                           *
 ****************************************************************************/

#include "common.h"
#include "elmer0.h"
#include "regs.h"
#include "gmac.h"
#include "cphy.h"
#include "sge.h"
#include "tp.h"
#include "espi.h"

/**
 *	t1_wait_op_done - wait until an operation is completed
 *	@adapter: the adapter performing the operation
 *	@reg: the register to check for completion
 *	@mask: a single-bit field within @reg that indicates completion
 *	@polarity: the value of the field when the operation is completed
 *	@attempts: number of check iterations
 *      @delay: delay in usecs between iterations
 *
 *	Wait until an operation is completed by checking a bit in a register
 *	up to @attempts times.  Returns %0 if the operation completes and %1
 *	otherwise.
 */
static int t1_wait_op_done(adapter_t *adapter, int reg, u32 mask, int polarity,
			   int attempts, int delay)
{
	while (1) {
		u32 val = readl(adapter->regs + reg) & mask;

		if (!!val == polarity)
			return 0;
		if (--attempts == 0)
			return 1;
		if (delay)
			udelay(delay);
	}
}

#define TPI_ATTEMPTS 50

/*
 * Write a register over the TPI interface (unlocked and locked versions).
 */
int __t1_tpi_write(adapter_t *adapter, u32 addr, u32 value)
{
	int tpi_busy;

	writel(addr, adapter->regs + A_TPI_ADDR);
	writel(value, adapter->regs + A_TPI_WR_DATA);
	writel(F_TPIWR, adapter->regs + A_TPI_CSR);

	tpi_busy = t1_wait_op_done(adapter, A_TPI_CSR, F_TPIRDY, 1,
				   TPI_ATTEMPTS, 3);
	if (tpi_busy)
		CH_ALERT("%s: TPI write to 0x%x failed\n",
			 adapter->name, addr);
	return tpi_busy;
}

int t1_tpi_write(adapter_t *adapter, u32 addr, u32 value)
{
	int ret;

	spin_lock(&adapter->tpi_lock);
	ret = __t1_tpi_write(adapter, addr, value);
	spin_unlock(&adapter->tpi_lock);
	return ret;
}

/*
 * Read a register over the TPI interface (unlocked and locked versions).
 */
int __t1_tpi_read(adapter_t *adapter, u32 addr, u32 *valp)
{
	int tpi_busy;

	writel(addr, adapter->regs + A_TPI_ADDR);
	writel(0, adapter->regs + A_TPI_CSR);

	tpi_busy = t1_wait_op_done(adapter, A_TPI_CSR, F_TPIRDY, 1,
				   TPI_ATTEMPTS, 3);
	if (tpi_busy)
		CH_ALERT("%s: TPI read from 0x%x failed\n",
			 adapter->name, addr);
	else
		*valp = readl(adapter->