/* * * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/ * * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the * distribution. * * Neither the name of Texas Instruments Incorporated nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /********************************************************************************** * FILE PURPOSE: A very simple mdio driver ********************************************************************************** * FILE NAME: mdio.c * * DESCRIPTION: Enables mdio and performs blind access * * @file mdio.c * * @brief * Enables mdio and performs blind access * **********************************************************************************/ #include "types.h" #include "mdio.h" #include "device.h" /*********************************************************************************** * FUNCTION PURPOSE: Provide an approximate delay *********************************************************************************** * DESCRIPTION: A delay in units of CPU cycles is executed ***********************************************************************************/ void mdio_delay (uint32 del) { volatile unsigned int i; for (i = 0; i < del/8; i++); } /*********************************************************************************** * FUNCTION PURPOSE: Perform blind MDIO access *********************************************************************************** * DESCRIPTION: Pre-configured mdio access is performed. ***********************************************************************************/ void hwMdio (int16 nAccess, uint32 *access, uint16 clkdiv, uint32 delayCpuCycles) { int16 i; /* Enable MDIO, set the divider. A divider value of 0 is not allowed */ if (clkdiv == 0) clkdiv = 1; MDIOR->CONTROL = (0x40000000 | clkdiv); for (i = 0; i < nAccess; i++) { /* Set the Go bit */ MDIOR->USERACCESS0 = (((uint32)1 << 31) | access[i]); while (MDIOR->USERACCESS0 & 0x80000000); mdio_delay (delayCpuCycles); } /* A big delay after the last configure */ mdio_delay (1000000); }