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eb5eb2b0f7
This patch cleans up the PPC4xx I2C intrastructure: - Use C struct to describe the I2C registers instead of defines - Coding style cleanup (braces, whitespace, comments, line length) - Extract common code from i2c_read() and i2c_write() - Remove unneeded IIC defines from ppc405.h & ppc440.h Signed-off-by: Stefan Roese <sr@denx.de>
128 lines
3.4 KiB
C
128 lines
3.4 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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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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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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#if defined(CONFIG_I2C_MULTI_BUS)
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#define I2C_BUS_OFFS (i2c_bus_num * 0x100)
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#else
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#define I2C_BUS_OFFS (0x000)
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#endif /* CONFIG_I2C_MULTI_BUS */
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#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
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defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
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defined(CONFIG_460EX) || defined(CONFIG_460GT)
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#define I2C_BASE_ADDR (CONFIG_SYS_PERIPHERAL_BASE + 0x00000700 + I2C_BUS_OFFS)
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#elif defined(CONFIG_440) || defined(CONFIG_405EX)
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/* all remaining 440 variants */
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#define I2C_BASE_ADDR (CONFIG_SYS_PERIPHERAL_BASE + 0x00000400 + I2C_BUS_OFFS)
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#else
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/* all 405 variants */
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#define I2C_BASE_ADDR (0xEF600500 + I2C_BUS_OFFS)
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#endif
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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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/* 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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