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https://github.com/AsahiLinux/u-boot
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50 lines
1 KiB
C
50 lines
1 KiB
C
#include <common.h>
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#include "dipsw.h"
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unsigned char
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dipsw_raw(void)
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{
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return cma_mb_reg_read(&((cma_mb_dipsw *)CMA_MB_DIPSW_BASE)->dip_val);
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}
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unsigned char
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dipsw_cooked(void)
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{
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unsigned char val1, val2, mask1, mask2;
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val1 = dipsw_raw();
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/*
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* we want to mirror the bits because the low bit is switch 1 and high
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* bit is switch 8 and also invert them because 1=off and 0=on, according
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* to manual.
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*
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* this makes the value more intuitive i.e.
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* - left most, or high, or top, bit is left most switch (1);
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* - right most, or low, or bottom, bit is right most switch (8)
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* - a set bit means "on" and a clear bit means "off"
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*/
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val2 = 0;
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for (mask1 = 1 << 7, mask2 = 1; mask1 > 0; mask1 >>= 1, mask2 <<= 1)
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if ((val1 & mask1) == 0)
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val2 |= mask2;
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return (val2);
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}
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void
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dipsw_init(void)
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{
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unsigned char val, mask;
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val = dipsw_cooked();
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printf("|");
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for (mask = 1 << 7; mask > 0; mask >>= 1)
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if (val & mask)
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printf("on |");
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else
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printf("off|");
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printf("\n");
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}
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