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50 lines
915 B
50 lines
915 B
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2017, Bin Meng <[email protected]> |
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*/ |
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/* |
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* This library provides CMOS (inside RTC SRAM) access routines at a very |
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* early stage when driver model is not available yet. Only read access is |
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* provided. The 16-bit/32-bit read are compatible with driver model RTC |
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* uclass write ops, that data is stored in little-endian mode. |
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*/ |
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#include <common.h> |
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#include <asm/early_cmos.h> |
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#include <asm/io.h> |
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u8 cmos_read8(u8 addr) |
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{ |
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outb(addr, CMOS_IO_PORT); |
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return inb(CMOS_IO_PORT + 1); |
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} |
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u16 cmos_read16(u8 addr) |
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{ |
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u16 value = 0; |
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u16 data; |
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int i; |
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for (i = 0; i < sizeof(value); i++) { |
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data = cmos_read8(addr + i); |
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value |= data << (i << 3); |
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} |
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return value; |
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} |
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u32 cmos_read32(u8 addr) |
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{ |
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u32 value = 0; |
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u32 data; |
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int i; |
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for (i = 0; i < sizeof(value); i++) { |
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data = cmos_read8(addr + i); |
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value |= data << (i << 3); |
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} |
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return value; |
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}
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