mirror of
https://github.com/d0k3/GodMode9.git
synced 2025-06-26 13:42:47 +00:00
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/*
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* This file is part of fastboot 3DS
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* Copyright (C) 2017 derrek, profi200
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "common.h"
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#include "spiflash.h"
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#define SPI_REGS_BUS2_BASE (0x10000000 + 0x100000 + 0x60000)
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#define REG_SPI_BUS2_CNT *((vu16*)(SPI_REGS_BUS2_BASE + 0x00))
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#define REG_SPI_BUS2_DATA *((vu8* )(SPI_REGS_BUS2_BASE + 0x02))
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static void spi_busy_wait()
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{
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while(REG_SPI_BUS2_CNT & 0x80);
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}
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static void spi_put_byte(u8 data)
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{
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REG_SPI_BUS2_DATA = data;
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spi_busy_wait();
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}
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static u8 spi_receive_byte()
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{
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// clock out a dummy byte
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REG_SPI_BUS2_DATA = 0x00;
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spi_busy_wait();
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return REG_SPI_BUS2_DATA;
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}
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// select spiflash if select=true, deselect otherwise
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static void spiflash_select(bool select)
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{
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// select device 1, enable SPI bus
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REG_SPI_BUS2_CNT = 0x8100 | (select << 11);
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}
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bool spiflash_get_status()
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{
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u8 resp;
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spi_busy_wait();
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spiflash_select(1);
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spi_put_byte(SPIFLASH_CMD_RDSR);
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spiflash_select(0);
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resp = spi_receive_byte();
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if(resp & 1) return false;
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return true;
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}
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void spiflash_read(u32 offset, u32 size, u8 *buf)
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{
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spi_busy_wait();
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spiflash_select(1);
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spi_put_byte(SPIFLASH_CMD_READ);
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// write addr (24-bit, msb first)
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for(int i=0; i<3; i++)
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{
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offset <<= 8;
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spi_put_byte((offset >> 24) & 0xFF);
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}
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// read bytes
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for(u32 i=0; i<size; i++)
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buf[i] = spi_receive_byte();
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// end of read
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spiflash_select(0);
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spi_receive_byte();
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}
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