[PATCH] PPC4xx: Add support for multiple I2C busses

This patch adds support for multiple I2C busses on the PPC4xx
platforms. Define CONFIG_I2C_MULTI_BUS in the board config file
to make use of this feature.

It also merges the 405 and 440 i2c header files into one common
file 4xx_i2c.h.

Also the 4xx i2c reset procedure is reworked since I experienced
some problems with the first access on the 440SPe Katmai board.

Signed-off-by: Stefan Roese <sr@denx.de>

4 files changed, 132 insertions, 135 deletions

diff --git a/include/405gp_i2c.h b/include/405gp_i2c.h
deleted file mode 100644
index 5a9a497..0000000
--- a/include/405gp_i2c.h
+++ /dev/null
@@ -1,64 +0,0 @@
-#ifndef _405gp_i2c_h_
-#define _405gp_i2c_h_
-
-#define	   I2C_REGISTERS_BASE_ADDRESS 0xEF600500
-#define    IIC_MDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICMDBUF)
-#define    IIC_SDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICSDBUF)
-#define    IIC_LMADR	(I2C_REGISTERS_BASE_ADDRESS+IICLMADR)
-#define    IIC_HMADR	(I2C_REGISTERS_BASE_ADDRESS+IICHMADR)
-#define    IIC_CNTL	(I2C_REGISTERS_BASE_ADDRESS+IICCNTL)
-#define    IIC_MDCNTL	(I2C_REGISTERS_BASE_ADDRESS+IICMDCNTL)
-#define    IIC_STS	(I2C_REGISTERS_BASE_ADDRESS+IICSTS)
-#define    IIC_EXTSTS	(I2C_REGISTERS_BASE_ADDRESS+IICEXTSTS)
-#define    IIC_LSADR	(I2C_REGISTERS_BASE_ADDRESS+IICLSADR)
-#define    IIC_HSADR	(I2C_REGISTERS_BASE_ADDRESS+IICHSADR)
-#define    IIC_CLKDIV	(I2C_REGISTERS_BASE_ADDRESS+IICCLKDIV)
-#define    IIC_INTRMSK	(I2C_REGISTERS_BASE_ADDRESS+IICINTRMSK)
-#define    IIC_XFRCNT	(I2C_REGISTERS_BASE_ADDRESS+IICXFRCNT)
-#define    IIC_XTCNTLSS	(I2C_REGISTERS_BASE_ADDRESS+IICXTCNTLSS)
-#define    IIC_DIRECTCNTL (I2C_REGISTERS_BASE_ADDRESS+IICDIRECTCNTL)
-
-/* MDCNTL Register Bit definition */
-#define    IIC_MDCNTL_HSCL 0x01
-#define    IIC_MDCNTL_EUBS 0x02
-#define    IIC_MDCNTL_EINT 0x04
-#define    IIC_MDCNTL_ESM  0x08
-#define    IIC_MDCNTL_FSM  0x10
-#define    IIC_MDCNTL_EGC  0x20
-#define    IIC_MDCNTL_FMDB 0x40
-#define    IIC_MDCNTL_FSDB 0x80
-
-/* CNTL Register Bit definition */
-#define    IIC_CNTL_PT     0x01
-#define    IIC_CNTL_READ   0x02
-#define    IIC_CNTL_CHT    0x04
-#define    IIC_CNTL_RPST   0x08
-/* bit 2/3 for Transfer count*/
-#define    IIC_CNTL_AMD    0x40
-#define    IIC_CNTL_HMT    0x80
-
-/* STS Register Bit definition */
-#define    IIC_STS_PT	   0X01
-#define    IIC_STS_IRQA    0x02
-#define    IIC_STS_ERR	   0X04
-#define    IIC_STS_SCMP    0x08
-#define    IIC_STS_MDBF    0x10
-#define    IIC_STS_MDBS    0X20
-#define    IIC_STS_SLPR    0x40
-#define    IIC_STS_SSS     0x80
-
-/* EXTSTS Register Bit definition */
-#define    IIC_EXTSTS_XFRA 0X01
-#define    IIC_EXTSTS_ICT  0X02
-#define    IIC_EXTSTS_LA   0X04
-
-/* XTCNTLSS Register Bit definition */
-#define    IIC_XTCNTLSS_SRST  0x01
-#define    IIC_XTCNTLSS_EPI   0x02
-#define    IIC_XTCNTLSS_SDBF  0x04
-#define    IIC_XTCNTLSS_SBDD  0x08
-#define    IIC_XTCNTLSS_SWS   0x10
-#define    IIC_XTCNTLSS_SWC   0x20
-#define    IIC_XTCNTLSS_SRS   0x40
-#define    IIC_XTCNTLSS_SRC   0x80
-#endif
diff --git a/include/440_i2c.h b/include/440_i2c.h
deleted file mode 100644
index 0c2bf36..0000000
--- a/include/440_i2c.h
+++ /dev/null
@@ -1,71 +0,0 @@
-#ifndef _440_i2c_h_
-#define _440_i2c_h_
-
-#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
-    defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
-#define    I2C_BASE_ADDR (CFG_PERIPHERAL_BASE + 0x00000700)
-#else
-#define    I2C_BASE_ADDR (CFG_PERIPHERAL_BASE + 0x00000400)
-#endif /*CONFIG_440EP CONFIG_440GR*/
-
-#define	   I2C_REGISTERS_BASE_ADDRESS I2C_BASE_ADDR
-#define    IIC_MDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICMDBUF)
-#define    IIC_SDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICSDBUF)
-#define    IIC_LMADR	(I2C_REGISTERS_BASE_ADDRESS+IICLMADR)
-#define    IIC_HMADR	(I2C_REGISTERS_BASE_ADDRESS+IICHMADR)
-#define    IIC_CNTL	(I2C_REGISTERS_BASE_ADDRESS+IICCNTL)
-#define    IIC_MDCNTL	(I2C_REGISTERS_BASE_ADDRESS+IICMDCNTL)
-#define    IIC_STS	(I2C_REGISTERS_BASE_ADDRESS+IICSTS)
-#define    IIC_EXTSTS	(I2C_REGISTERS_BASE_ADDRESS+IICEXTSTS)
-#define    IIC_LSADR	(I2C_REGISTERS_BASE_ADDRESS+IICLSADR)
-#define    IIC_HSADR	(I2C_REGISTERS_BASE_ADDRESS+IICHSADR)
-#define    IIC_CLKDIV	(I2C_REGISTERS_BASE_ADDRESS+IICCLKDIV)
-#define    IIC_INTRMSK	(I2C_REGISTERS_BASE_ADDRESS+IICINTRMSK)
-#define    IIC_XFRCNT	(I2C_REGISTERS_BASE_ADDRESS+IICXFRCNT)
-#define    IIC_XTCNTLSS	(I2C_REGISTERS_BASE_ADDRESS+IICXTCNTLSS)
-#define    IIC_DIRECTCNTL (I2C_REGISTERS_BASE_ADDRESS+IICDIRECTCNTL)
-
-/* MDCNTL Register Bit definition */
-#define    IIC_MDCNTL_HSCL 0x01
-#define    IIC_MDCNTL_EUBS 0x02
-#define    IIC_MDCNTL_EINT 0x04
-#define    IIC_MDCNTL_ESM  0x08
-#define    IIC_MDCNTL_FSM  0x10
-#define    IIC_MDCNTL_EGC  0x20
-#define    IIC_MDCNTL_FMDB 0x40
-#define    IIC_MDCNTL_FSDB 0x80
-
-/* CNTL Register Bit definition */
-#define    IIC_CNTL_PT     0x01
-#define    IIC_CNTL_READ   0x02
-#define    IIC_CNTL_CHT    0x04
-#define    IIC_CNTL_RPST   0x08
-/* bit 2/3 for Transfer count*/
-#define    IIC_CNTL_AMD    0x40
-#define    IIC_CNTL_HMT    0x80
-
-/* STS Register Bit definition */
-#define    IIC_STS_PT	   0X01
-#define    IIC_STS_IRQA    0x02
-#define    IIC_STS_ERR	   0X04
-#define    IIC_STS_SCMP    0x08
-#define    IIC_STS_MDBF    0x10
-#define    IIC_STS_MDBS    0X20
-#define    IIC_STS_SLPR    0x40
-#define    IIC_STS_SSS     0x80
-
-/* EXTSTS Register Bit definition */
-#define    IIC_EXTSTS_XFRA 0X01
-#define    IIC_EXTSTS_ICT  0X02
-#define    IIC_EXTSTS_LA   0X04
-
-/* XTCNTLSS Register Bit definition */
-#define    IIC_XTCNTLSS_SRST  0x01
-#define    IIC_XTCNTLSS_EPI   0x02
-#define    IIC_XTCNTLSS_SDBF  0x04
-#define    IIC_XTCNTLSS_SBDD  0x08
-#define    IIC_XTCNTLSS_SWS   0x10
-#define    IIC_XTCNTLSS_SWC   0x20
-#define    IIC_XTCNTLSS_SRS   0x40
-#define    IIC_XTCNTLSS_SRC   0x80
-#endif
diff --git a/include/4xx_i2c.h b/include/4xx_i2c.h
new file mode 100644
index 0000000..66b7997
--- /dev/null
+++ b/include/4xx_i2c.h
@@ -0,0 +1,122 @@
+/*
+ * (C) Copyright 2007
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _4xx_i2c_h_
+#define _4xx_i2c_h_
+
+#define IIC_OK		0
+#define IIC_NOK		1
+#define IIC_NOK_LA	2		/* Lost arbitration */
+#define IIC_NOK_ICT	3		/* Incomplete transfer */
+#define IIC_NOK_XFRA	4		/* Transfer aborted */
+#define IIC_NOK_DATA	5		/* No data in buffer */
+#define IIC_NOK_TOUT	6		/* Transfer timeout */
+
+#define IIC_TIMEOUT	1		/* 1 second */
+
+#if defined(CONFIG_I2C_MULTI_BUS)
+#define I2C_BUS_OFFS	(i2c_bus_num * 0x100)
+#else
+#define I2C_BUS_OFFS	(0x000)
+#endif /* CONFIG_I2C_MULTI_BUS */
+
+#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
+    defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
+#define I2C_BASE_ADDR	(CFG_PERIPHERAL_BASE + 0x00000700 + I2C_BUS_OFFS)
+#elif defined(CONFIG_440)
+/* all remaining 440 variants */
+#define I2C_BASE_ADDR	(CFG_PERIPHERAL_BASE + 0x00000400 + I2C_BUS_OFFS)
+#else
+/* all 405 variants */
+#define I2C_BASE_ADDR	(0xEF600500 + I2C_BUS_OFFS)
+#endif
+
+#define I2C_REGISTERS_BASE_ADDRESS I2C_BASE_ADDR
+#define IIC_MDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICMDBUF)
+#define IIC_SDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICSDBUF)
+#define IIC_LMADR	(I2C_REGISTERS_BASE_ADDRESS+IICLMADR)
+#define IIC_HMADR	(I2C_REGISTERS_BASE_ADDRESS+IICHMADR)
+#define IIC_CNTL	(I2C_REGISTERS_BASE_ADDRESS+IICCNTL)
+#define IIC_MDCNTL	(I2C_REGISTERS_BASE_ADDRESS+IICMDCNTL)
+#define IIC_STS		(I2C_REGISTERS_BASE_ADDRESS+IICSTS)
+#define IIC_EXTSTS	(I2C_REGISTERS_BASE_ADDRESS+IICEXTSTS)
+#define IIC_LSADR	(I2C_REGISTERS_BASE_ADDRESS+IICLSADR)
+#define IIC_HSADR	(I2C_REGISTERS_BASE_ADDRESS+IICHSADR)
+#define IIC_CLKDIV	(I2C_REGISTERS_BASE_ADDRESS+IICCLKDIV)
+#define IIC_INTRMSK	(I2C_REGISTERS_BASE_ADDRESS+IICINTRMSK)
+#define IIC_XFRCNT	(I2C_REGISTERS_BASE_ADDRESS+IICXFRCNT)
+#define IIC_XTCNTLSS	(I2C_REGISTERS_BASE_ADDRESS+IICXTCNTLSS)
+#define IIC_DIRECTCNTL	(I2C_REGISTERS_BASE_ADDRESS+IICDIRECTCNTL)
+
+/* MDCNTL Register Bit definition */
+#define IIC_MDCNTL_HSCL		0x01
+#define IIC_MDCNTL_EUBS		0x02
+#define IIC_MDCNTL_EINT		0x04
+#define IIC_MDCNTL_ESM		0x08
+#define IIC_MDCNTL_FSM		0x10
+#define IIC_MDCNTL_EGC		0x20
+#define IIC_MDCNTL_FMDB		0x40
+#define IIC_MDCNTL_FSDB		0x80
+
+/* CNTL Register Bit definition */
+#define IIC_CNTL_PT		0x01
+#define IIC_CNTL_READ		0x02
+#define IIC_CNTL_CHT		0x04
+#define IIC_CNTL_RPST		0x08
+/* bit 2/3 for Transfer count*/
+#define IIC_CNTL_AMD		0x40
+#define IIC_CNTL_HMT		0x80
+
+/* STS Register Bit definition */
+#define IIC_STS_PT		0x01
+#define IIC_STS_IRQA		0x02
+#define IIC_STS_ERR		0x04
+#define IIC_STS_SCMP		0x08
+#define IIC_STS_MDBF		0x10
+#define IIC_STS_MDBS		0x20
+#define IIC_STS_SLPR		0x40
+#define IIC_STS_SSS		0x80
+
+/* EXTSTS Register Bit definition */
+#define IIC_EXTSTS_XFRA		0x01
+#define IIC_EXTSTS_ICT		0x02
+#define IIC_EXTSTS_LA		0x04
+
+/* XTCNTLSS Register Bit definition */
+#define IIC_XTCNTLSS_SRST	0x01
+#define IIC_XTCNTLSS_EPI	0x02
+#define IIC_XTCNTLSS_SDBF	0x04
+#define IIC_XTCNTLSS_SBDD	0x08
+#define IIC_XTCNTLSS_SWS	0x10
+#define IIC_XTCNTLSS_SWC	0x20
+#define IIC_XTCNTLSS_SRS	0x40
+#define IIC_XTCNTLSS_SRC	0x80
+
+/* IICx_DIRECTCNTL register */
+#define IIC_DIRCNTL_SDAC	0x08
+#define IIC_DIRCNTL_SCC		0x04
+#define IIC_DIRCNTL_MSDA	0x02
+#define IIC_DIRCNTL_MSC		0x01
+
+#define DIRCTNL_FREE(v)		(((v) & 0x0f) == 0x0f)
+#endif
diff --git a/include/i2c.h b/include/i2c.h
index a8f729a..54c6f9f 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -46,6 +46,16 @@
  */
 #define I2C_RXTX_LEN	128	/* maximum tx/rx buffer length */
 
+#if defined(CONFIG_I2C_MULTI_BUS)
+#define CFG_MAX_I2C_BUS		2
+#define I2C_GET_BUS()		i2c_get_bus_num()
+#define I2C_SET_BUS(a)		i2c_set_bus_num(a)
+#else
+#define CFG_MAX_I2C_BUS		1
+#define I2C_GET_BUS()		0
+#define I2C_SET_BUS(a)
+#endif
+
 /*
  * Initialization, must be called once on start up, may be called
  * repeatedly to change the speed and slave addresses.