64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
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/*
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* Milkymist SoC (Software)
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* Copyright (C) 2012 Sebastien Bourdeauducq
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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, version 3 of the License.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <hw/s6ddrphy.h>
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#include "ddrinit.h"
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static void init_sequence(void)
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{
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printf("Sending initialization sequence...\n");
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// TODO
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}
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static void calibrate_phy(void)
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{
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int requests;
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int addr;
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printf("Calibrating PHY...\n");
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while(!(CSR_DDRPHY_STATUS & DDRPHY_STATUS_PHY_CAL_DONE)) {
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requests = CSR_DDRPHY_REQUESTS;
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addr = CSR_DDRPHY_REQADDR;
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if(requests & DDRPHY_REQUEST_READ) {
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printf("R %d\n", addr);
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// TODO
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}
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if(requests & DDRPHY_REQUEST_WRITE) {
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printf("W %d\n", addr);
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// TODO
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}
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CSR_DDRPHY_REQUESTS = requests;
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}
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}
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int ddrinit(void)
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{
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printf("Initializing DDR SDRAM...\n");
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CSR_DDRPHY_STATUS = DDRPHY_STATUS_RESETN;
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init_sequence();
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CSR_DDRPHY_STATUS = DDRPHY_STATUS_RESETN|DDRPHY_STATUS_INIT_DONE;
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calibrate_phy();
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return 1;
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}
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