threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
38 lines
709 B
C
38 lines
709 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/sh/kernel/adc.c -- SH3 on-chip ADC support
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*
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* Copyright (C) 2004 Andriy Skulysh <askulysh@image.kiev.ua>
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*/
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#include <linux/module.h>
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#include <asm/adc.h>
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#include <asm/io.h>
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int adc_single(unsigned int channel)
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{
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int off;
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unsigned char csr;
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if (channel >= 8) return -1;
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off = (channel & 0x03) << 2;
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csr = __raw_readb(ADCSR);
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csr = channel | ADCSR_ADST | ADCSR_CKS;
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__raw_writeb(csr, ADCSR);
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do {
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csr = __raw_readb(ADCSR);
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} while ((csr & ADCSR_ADF) == 0);
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csr &= ~(ADCSR_ADF | ADCSR_ADST);
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__raw_writeb(csr, ADCSR);
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return (((__raw_readb(ADDRAH + off) << 8) |
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__raw_readb(ADDRAL + off)) >> 6);
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}
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EXPORT_SYMBOL(adc_single);
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