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https://github.com/brain-hackers/u-boot-brain
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b97cd6814e
ppc4xx i2c master gets stuck on errors while repeated start is active. Can be easily reproduced by "i2c md" on an unpopulated i2c address. There is not stop condition given, scl remains pulled low. The only way out seems to be doing a stop manually and then a soft reset. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc> Reviewed-by: Stefan Roese <sr@denx.de>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/*
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* (C) Copyright 2007-2009
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _4xx_i2c_h_
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#define _4xx_i2c_h_
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#define IIC_OK 0
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#define IIC_NOK 1
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#define IIC_NOK_LA 2 /* Lost arbitration */
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#define IIC_NOK_ICT 3 /* Incomplete transfer */
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#define IIC_NOK_XFRA 4 /* Transfer aborted */
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#define IIC_NOK_DATA 5 /* No data in buffer */
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#define IIC_NOK_TOUT 6 /* Transfer timeout */
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#define IIC_TIMEOUT 1 /* 1 second */
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struct ppc4xx_i2c {
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u8 mdbuf;
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u8 res1;
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u8 sdbuf;
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u8 res2;
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u8 lmadr;
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u8 hmadr;
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u8 cntl;
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u8 mdcntl;
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u8 sts;
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u8 extsts;
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u8 lsadr;
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u8 hsadr;
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u8 clkdiv;
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u8 intrmsk;
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u8 xfrcnt;
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u8 xtcntlss;
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u8 directcntl;
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u8 intr;
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};
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/* MDCNTL Register Bit definition */
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#define IIC_MDCNTL_HSCL 0x01
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#define IIC_MDCNTL_EUBS 0x02
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#define IIC_MDCNTL_EINT 0x04
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#define IIC_MDCNTL_ESM 0x08
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#define IIC_MDCNTL_FSM 0x10
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#define IIC_MDCNTL_EGC 0x20
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#define IIC_MDCNTL_FMDB 0x40
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#define IIC_MDCNTL_FSDB 0x80
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/* CNTL Register Bit definition */
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#define IIC_CNTL_PT 0x01
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#define IIC_CNTL_READ 0x02
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#define IIC_CNTL_CHT 0x04
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#define IIC_CNTL_RPST 0x08
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/* bit 2/3 for Transfer count*/
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#define IIC_CNTL_AMD 0x40
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#define IIC_CNTL_HMT 0x80
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/* STS Register Bit definition */
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#define IIC_STS_PT 0x01
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#define IIC_STS_IRQA 0x02
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#define IIC_STS_ERR 0x04
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#define IIC_STS_SCMP 0x08
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#define IIC_STS_MDBF 0x10
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#define IIC_STS_MDBS 0x20
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#define IIC_STS_SLPR 0x40
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#define IIC_STS_SSS 0x80
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/* EXTSTS Register Bit definition */
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#define IIC_EXTSTS_XFRA 0x01
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#define IIC_EXTSTS_ICT 0x02
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#define IIC_EXTSTS_LA 0x04
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#define IIC_EXTSTS_BCS_MASK 0x70
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#define IIC_EXTSTS_BCS_FREE 0x40
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/* XTCNTLSS Register Bit definition */
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#define IIC_XTCNTLSS_SRST 0x01
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#define IIC_XTCNTLSS_EPI 0x02
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#define IIC_XTCNTLSS_SDBF 0x04
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#define IIC_XTCNTLSS_SBDD 0x08
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#define IIC_XTCNTLSS_SWS 0x10
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#define IIC_XTCNTLSS_SWC 0x20
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#define IIC_XTCNTLSS_SRS 0x40
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#define IIC_XTCNTLSS_SRC 0x80
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/* IICx_DIRECTCNTL register */
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#define IIC_DIRCNTL_SDAC 0x08
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#define IIC_DIRCNTL_SCC 0x04
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#define IIC_DIRCNTL_MSDA 0x02
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#define IIC_DIRCNTL_MSC 0x01
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#define DIRCTNL_FREE(v) (((v) & 0x0f) == 0x0f)
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#endif
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