Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * linux/arch/sh/kernel/adc.c -- SH3 on-chip ADC support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Copyright (C) 2004  Andriy Skulysh <askulysh@image.kiev.ua>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <asm/adc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) int adc_single(unsigned int channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	int off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	unsigned char csr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	if (channel >= 8) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	off = (channel & 0x03) << 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	csr = __raw_readb(ADCSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	csr = channel | ADCSR_ADST | ADCSR_CKS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	__raw_writeb(csr, ADCSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		csr = __raw_readb(ADCSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	} while ((csr & ADCSR_ADF) == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	csr &= ~(ADCSR_ADF | ADCSR_ADST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	__raw_writeb(csr, ADCSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	return (((__raw_readb(ADDRAH + off) << 8) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		__raw_readb(ADDRAL + off)) >> 6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) EXPORT_SYMBOL(adc_single);