diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-ibm_iic.h')
| -rw-r--r-- | drivers/i2c/busses/i2c-ibm_iic.h | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-ibm_iic.h b/drivers/i2c/busses/i2c-ibm_iic.h new file mode 100644 index 0000000000..f0288889c7 --- /dev/null +++ b/drivers/i2c/busses/i2c-ibm_iic.h @@ -0,0 +1,118 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * drivers/i2c/busses/i2c-ibm_iic.h + * + * Support for the IIC peripheral on IBM PPC 4xx + * + * Copyright (c) 2003 Zultys Technologies. + * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> + * + * Based on original work by + * Ian DaSilva <idasilva@mvista.com> + * Armin Kuster <akuster@mvista.com> + * Matt Porter <mporter@mvista.com> + * + * Copyright 2000-2003 MontaVista Software Inc. + */ +#ifndef __I2C_IBM_IIC_H_ +#define __I2C_IBM_IIC_H_ + +#include <linux/i2c.h> + +struct iic_regs { + u16 mdbuf; + u16 sbbuf; + u8 lmadr; + u8 hmadr; + u8 cntl; + u8 mdcntl; + u8 sts; + u8 extsts; + u8 lsadr; + u8 hsadr; + u8 clkdiv; + u8 intmsk; + u8 xfrcnt; + u8 xtcntlss; + u8 directcntl; +}; + +struct ibm_iic_private { + struct i2c_adapter adap; + volatile struct iic_regs __iomem *vaddr; + wait_queue_head_t wq; + int idx; + int irq; + int fast_mode; + u8 clckdiv; +}; + +/* IICx_CNTL register */ +#define CNTL_HMT 0x80 +#define CNTL_AMD 0x40 +#define CNTL_TCT_MASK 0x30 +#define CNTL_TCT_SHIFT 4 +#define CNTL_RPST 0x08 +#define CNTL_CHT 0x04 +#define CNTL_RW 0x02 +#define CNTL_PT 0x01 + +/* IICx_MDCNTL register */ +#define MDCNTL_FSDB 0x80 +#define MDCNTL_FMDB 0x40 +#define MDCNTL_EGC 0x20 +#define MDCNTL_FSM 0x10 +#define MDCNTL_ESM 0x08 +#define MDCNTL_EINT 0x04 +#define MDCNTL_EUBS 0x02 +#define MDCNTL_HSCL 0x01 + +/* IICx_STS register */ +#define STS_SSS 0x80 +#define STS_SLPR 0x40 +#define STS_MDBS 0x20 +#define STS_MDBF 0x10 +#define STS_SCMP 0x08 +#define STS_ERR 0x04 +#define STS_IRQA 0x02 +#define STS_PT 0x01 + +/* IICx_EXTSTS register */ +#define EXTSTS_IRQP 0x80 +#define EXTSTS_BCS_MASK 0x70 +#define EXTSTS_BCS_FREE 0x40 +#define EXTSTS_IRQD 0x08 +#define EXTSTS_LA 0x04 +#define EXTSTS_ICT 0x02 +#define EXTSTS_XFRA 0x01 + +/* IICx_INTRMSK register */ +#define INTRMSK_EIRC 0x80 +#define INTRMSK_EIRS 0x40 +#define INTRMSK_EIWC 0x20 +#define INTRMSK_EIWS 0x10 +#define INTRMSK_EIHE 0x08 +#define INTRMSK_EIIC 0x04 +#define INTRMSK_EITA 0x02 +#define INTRMSK_EIMTC 0x01 + +/* IICx_XFRCNT register */ +#define XFRCNT_MTC_MASK 0x07 + +/* IICx_XTCNTLSS register */ +#define XTCNTLSS_SRC 0x80 +#define XTCNTLSS_SRS 0x40 +#define XTCNTLSS_SWC 0x20 +#define XTCNTLSS_SWS 0x10 +#define XTCNTLSS_SRST 0x01 + +/* IICx_DIRECTCNTL register */ +#define DIRCNTL_SDAC 0x08 +#define DIRCNTL_SCC 0x04 +#define DIRCNTL_MSDA 0x02 +#define DIRCNTL_MSC 0x01 + +/* Check if we really control the I2C bus and bus is free */ +#define DIRCTNL_FREE(v) (((v) & 0x0f) == 0x0f) + +#endif /* __I2C_IBM_IIC_H_ */ |