245 lines
5.4 KiB
C
245 lines
5.4 KiB
C
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/*
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*************************************************************************
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* Ralink Tech Inc.
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* 5F., No.36, Taiyuan St., Jhubei City,
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* Hsinchu County 302,
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* Taiwan, R.O.C.
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*
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* (c) Copyright 2002-2007, Ralink Technology, Inc.
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*
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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* *
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*************************************************************************
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Module Name:
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eeprom.c
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Abstract:
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Revision History:
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Who When What
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-------- ---------- ----------------------------------------------
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Name Date Modification logs
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*/
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#include "../rt_config.h"
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// IRQL = PASSIVE_LEVEL
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VOID RaiseClock(
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IN PRTMP_ADAPTER pAd,
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IN UINT32 *x)
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{
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*x = *x | EESK;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, *x);
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RTMPusecDelay(1); // Max frequency = 1MHz in Spec. definition
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}
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// IRQL = PASSIVE_LEVEL
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VOID LowerClock(
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IN PRTMP_ADAPTER pAd,
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IN UINT32 *x)
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{
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*x = *x & ~EESK;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, *x);
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RTMPusecDelay(1);
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}
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// IRQL = PASSIVE_LEVEL
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USHORT ShiftInBits(
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IN PRTMP_ADAPTER pAd)
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{
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UINT32 x,i;
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USHORT data=0;
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~( EEDO | EEDI);
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for(i=0; i<16; i++)
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{
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data = data << 1;
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RaiseClock(pAd, &x);
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~(EEDI);
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if(x & EEDO)
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data |= 1;
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LowerClock(pAd, &x);
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}
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return data;
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}
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// IRQL = PASSIVE_LEVEL
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VOID ShiftOutBits(
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IN PRTMP_ADAPTER pAd,
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IN USHORT data,
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IN USHORT count)
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{
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UINT32 x,mask;
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mask = 0x01 << (count - 1);
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~(EEDO | EEDI);
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do
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{
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x &= ~EEDI;
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if(data & mask) x |= EEDI;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, x);
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RaiseClock(pAd, &x);
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LowerClock(pAd, &x);
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mask = mask >> 1;
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} while(mask);
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x &= ~EEDI;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, x);
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}
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// IRQL = PASSIVE_LEVEL
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VOID EEpromCleanup(
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IN PRTMP_ADAPTER pAd)
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{
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UINT32 x;
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~(EECS | EEDI);
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, x);
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RaiseClock(pAd, &x);
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LowerClock(pAd, &x);
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}
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VOID EWEN(
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IN PRTMP_ADAPTER pAd)
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{
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UINT32 x;
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// reset bits and set EECS
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~(EEDI | EEDO | EESK);
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x |= EECS;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, x);
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// kick a pulse
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RaiseClock(pAd, &x);
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LowerClock(pAd, &x);
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// output the read_opcode and six pulse in that order
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ShiftOutBits(pAd, EEPROM_EWEN_OPCODE, 5);
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ShiftOutBits(pAd, 0, 6);
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EEpromCleanup(pAd);
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}
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VOID EWDS(
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IN PRTMP_ADAPTER pAd)
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{
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UINT32 x;
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// reset bits and set EECS
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~(EEDI | EEDO | EESK);
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x |= EECS;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, x);
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// kick a pulse
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RaiseClock(pAd, &x);
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LowerClock(pAd, &x);
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// output the read_opcode and six pulse in that order
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ShiftOutBits(pAd, EEPROM_EWDS_OPCODE, 5);
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ShiftOutBits(pAd, 0, 6);
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EEpromCleanup(pAd);
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}
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// IRQL = PASSIVE_LEVEL
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USHORT RTMP_EEPROM_READ16(
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IN PRTMP_ADAPTER pAd,
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IN USHORT Offset)
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{
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UINT32 x;
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USHORT data;
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Offset /= 2;
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// reset bits and set EECS
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~(EEDI | EEDO | EESK);
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x |= EECS;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, x);
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// kick a pulse
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RaiseClock(pAd, &x);
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LowerClock(pAd, &x);
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// output the read_opcode and register number in that order
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ShiftOutBits(pAd, EEPROM_READ_OPCODE, 3);
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ShiftOutBits(pAd, Offset, pAd->EEPROMAddressNum);
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// Now read the data (16 bits) in from the selected EEPROM word
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data = ShiftInBits(pAd);
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EEpromCleanup(pAd);
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return data;
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} //ReadEEprom
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VOID RTMP_EEPROM_WRITE16(
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IN PRTMP_ADAPTER pAd,
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IN USHORT Offset,
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IN USHORT Data)
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{
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UINT32 x;
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Offset /= 2;
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EWEN(pAd);
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// reset bits and set EECS
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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x &= ~(EEDI | EEDO | EESK);
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x |= EECS;
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RTMP_IO_WRITE32(pAd, E2PROM_CSR, x);
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// kick a pulse
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RaiseClock(pAd, &x);
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LowerClock(pAd, &x);
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// output the read_opcode ,register number and data in that order
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ShiftOutBits(pAd, EEPROM_WRITE_OPCODE, 3);
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ShiftOutBits(pAd, Offset, pAd->EEPROMAddressNum);
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ShiftOutBits(pAd, Data, 16); // 16-bit access
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// read DO status
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RTMP_IO_READ32(pAd, E2PROM_CSR, &x);
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EEpromCleanup(pAd);
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RTMPusecDelay(10000); //delay for twp(MAX)=10ms
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EWDS(pAd);
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EEpromCleanup(pAd);
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}
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