76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
/*
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mini - a Free Software replacement for the Nintendo/BroadOn IOS.
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SEEPROM support
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Copyright (C) 2008, 2009 Sven Peter <svenpeter@gmail.com>
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# This code is licensed to you under the terms of the GNU GPL, version 2;
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# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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*/
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#include "types.h"
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#include "utils.h"
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#include "hollywood.h"
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#include "start.h"
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#include "gpio.h"
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#define eeprom_delay() udelay(5)
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void send_bits(int b, int bits)
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{
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while(bits--)
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{
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if(b & (1 << bits))
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set32(HW_GPIO1OUT, GP_EEP_MOSI);
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else
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clear32(HW_GPIO1OUT, GP_EEP_MOSI);
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eeprom_delay();
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set32(HW_GPIO1OUT, GP_EEP_CLK);
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eeprom_delay();
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clear32(HW_GPIO1OUT, GP_EEP_CLK);
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eeprom_delay();
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}
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}
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int recv_bits(int bits)
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{
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int res = 0;
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while(bits--)
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{
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res <<= 1;
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set32(HW_GPIO1OUT, GP_EEP_CLK);
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eeprom_delay();
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clear32(HW_GPIO1OUT, GP_EEP_CLK);
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eeprom_delay();
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res |= !!(read32(HW_GPIO1IN) & GP_EEP_MISO);
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}
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return res;
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}
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int seeprom_read(void *dst, int offset, int size)
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{
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int i;
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u16 *ptr = (u16 *)dst;
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u16 recv;
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if(size & 1)
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return -1;
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clear32(HW_GPIO1OUT, GP_EEP_CLK);
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clear32(HW_GPIO1OUT, GP_EEP_CS);
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eeprom_delay();
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for(i = 0; i < size; ++i)
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{
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set32(HW_GPIO1OUT, GP_EEP_CS);
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send_bits((0x600 | (offset + i)), 11);
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recv = recv_bits(16);
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*ptr++ = recv;
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clear32(HW_GPIO1OUT, GP_EEP_CS);
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eeprom_delay();
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}
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return size;
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}
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