i2c/busses/i2c-acorn.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  *  ARM IOC/IOMD i2c driver.
7  *  On Acorn machines, the following i2c devices are on the bus:
8  *	- PCF8583 real time clock & static RAM
11 #include <linux/i2c.h>
12 #include <linux/i2c-algo-bit.h>
19 #define SCL		0x02  macro
23  * We must preserve all non-i2c output bits in IOC_CONTROL.
24  * Note also that we need to preserve the value of SCL and
32 	u_int ioc_control = ioc_readb(IOC_CONTROL) & ~(SCL | SDA);  in ioc_setscl()
36 		ones |= SCL;  in ioc_setscl()
38 		ones &= ~SCL;  in ioc_setscl()
47 	u_int ioc_control = ioc_readb(IOC_CONTROL) & ~(SCL | SDA);  in ioc_setsda()
62 	return (ioc_readb(IOC_CONTROL) & SCL) != 0;  in ioc_getscl()
76 	.timeout	= HZ,
87 	force_ones = FORCE_ONES | SCL | SDA;  in i2c_ioc_init()
95 MODULE_DESCRIPTION("ARM IOC/IOMD i2c driver");