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https://github.com/openhwgroup/cvw
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70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
///////////////////////////////////////////
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// SDC.sv
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//
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// Written: Rose Thompson September 25, 2021
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// Modified:
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//
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// Purpose: driver for sdc reader.
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
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// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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///////////////////////////////////////////
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#include "sdcDriver.h"
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#define SDC_MAIL_BOX 0x12100
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void copySDC512(long int blockAddr, long int * Dst) {
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waitInitSDC();
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volatile long int * mailBoxAddr;
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volatile int * mailBoxCmd;
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volatile int * mailBoxStatus;
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volatile long int * mailBoxReadData;
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mailBoxStatus = (int *) (SDC_MAIL_BOX + 0x4);
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mailBoxCmd = (int *) (SDC_MAIL_BOX + 0x8);
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mailBoxAddr = (long int *) (SDC_MAIL_BOX + 0x10);
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mailBoxReadData = (long int *) (SDC_MAIL_BOX + 0x18);
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// write the SDC address register with the blockAddr
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*mailBoxAddr = blockAddr;
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*mailBoxCmd = 0x4;
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// wait until the mailbox has valid data
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// this occurs when status[1] = 0
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while((*mailBoxStatus & 0x2) == 0x2);
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int index;
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for(index = 0; index < 512/8; index++) {
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Dst[index] = *mailBoxReadData;
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}
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}
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volatile void waitInitSDC(){
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volatile int * mailBoxStatus;
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mailBoxStatus = (int *) (SDC_MAIL_BOX + 0x4);
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while((*mailBoxStatus & 0x1) != 0x1);
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}
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void setSDCCLK(int divider){
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divider = (1 - (divider >> 1));
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volatile int * mailBoxCLK;
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mailBoxCLK = (int *) (SDC_MAIL_BOX + 0x0);
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*mailBoxCLK = divider;
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}
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