Add i2c driver (to etrax) improved by Geert Vancompernolle

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@14462 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h

@@ -0,0 +1,49 @@
+#ifndef _LINUX_ETRAXI2C_H
+#define _LINUX_ETRAXI2C_H
+
+/* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */
+
+#define ETRAXI2C_IOCTYPE 44
+
+/* supported ioctl _IOC_NR's */
+
+/* in write operations, the argument contains both i2c
+ * slave, register and value.
+ */
+
+#define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value))
+#define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8))
+
+#define I2C_ARGSLAVE(arg) ((arg) >> 16)
+#define I2C_ARGREG(arg) (((arg) >> 8) & 0xff)
+#define I2C_ARGVALUE(arg) ((arg) & 0xff)
+
+#define I2C_WRITEREG    0x1   /* write to an I2C register */
+#define I2C_READREG     0x2   /* read from an I2C register */
+
+/*
+EXAMPLE usage:
+
+    i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val);
+    ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg);
+
+    i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
+    val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);
+
+*/
+
+/* Extended part */
+#define I2C_READ        0x4     /* reads from I2C device */
+#define I2C_WRITE       0x3     /* writes to I2C device */
+#define I2C_WRITEREAD   0x5	    /* writes to I2C device where to start reading */
+
+typedef struct _I2C_DATA 
+{
+    unsigned char slave;        /* I2C address (8-bit representation) of slave device */
+    unsigned char wbuf[256];    /* Write buffer (length = 256 bytes) */
+	unsigned int  wlen;         /* Number of bytes to write from wbuf[] */   
+	unsigned char rbuf[256];    /* Read buffer (length = 256 bytes) */
+    unsigned int  rlen;         /* Number of bytes to read into rbuf[] */
+} I2C_DATA;
+
+#endif

target/linux/etrax/files/arch/cris/arch-v10/drivers/i2c_errno.h

@@ -0,0 +1,20 @@
+#ifndef _I2C_ERRNO_H
+#define _I2C_ERRNO_H
+
+#define EI2CNOERRORS  0     /* All fine */
+#define EI2CBUSNFREE  1     /* I2C bus not free */
+#define EI2CWADDRESS  2     /* Address write failed */
+#define EI2CRADDRESS  3     /* Address read failed */
+#define EI2CSENDDATA  4     /* Sending data failed */
+#define EI2CRECVDATA  5     /* Receiving data failed */
+#define EI2CSTRTCOND  6     /* Start condition failed */
+#define EI2CRSTACOND  7     /* Repeated start condition failed */
+#define EI2CSTOPCOND  8     /* Stop condition failed */
+#define EI2CNOSNDBYT  9     /* Number of send bytes is 0, while there's a send buffer defined */ 
+#define EI2CNOSNDBUF  10    /* No send buffer defined, while number of send bytes is not 0 */
+#define EI2CNORCVBYT  11    /* Number of receive bytes is 0, while there's a receive buffer defined */
+#define EI2CNORCVBUF  12    /* No receive buffer defined, while number of receive bytes is not 0 */
+#define EI2CNOACKNLD  13    /* No acknowledge received from slave */
+#define EI2CNOMNUMBR  14    /* No MAJOR number received from kernel while registering the device */
+
+#endif /* _I2C_ERRNO_H */

target/linux/etrax/files/arch/cris/arch-v10/drivers/i2c_gvc.h

@@ -0,0 +1,31 @@
+/* $Id: i2c.h,v 1.3 2004/05/28 09:26:59 starvik Exp $ */
+#ifndef _I2C_H
+#define _I2C_H
+
+int i2c_init(void);
+
+/* High level I2C actions */
+int i2c_writereg(unsigned char theSlave, unsigned char theReg, unsigned char theValue);
+unsigned char i2c_readreg(unsigned char theSlave, unsigned char theReg);
+
+/* Low level I2C */
+int i2c_start(void);
+int i2c_stop(void);
+int i2c_outbyte(unsigned char x);
+unsigned char i2c_inbyte(void);
+int i2c_getack(void);
+void i2c_sendack(void);
+void i2c_sendnack(void);
+
+/**GVC**/
+/* New low level I2C functions */
+int i2c_read( unsigned char slave, unsigned char* rbuf, unsigned char rlen );
+int i2c_write( unsigned char slave, unsigned char* wbuf, unsigned char wlen );
+int i2c_writeread( unsigned char  slave
+                 , unsigned char* wbuf
+                 , unsigned char  wlen
+                 , unsigned char* rbuf
+                 , unsigned char  rlen
+                 );
+/**END GVC**/
+#endif /* _I2C_H */

target/linux/etrax/patches-2.6.25/500-i2c_gvc.patch

@@ -0,0 +1,45 @@
+Index: linux-2.6.25.20/arch/cris/arch-v10/drivers/Kconfig
+===================================================================
+--- linux-2.6.25.20.orig/arch/cris/arch-v10/drivers/Kconfig	2009-02-09 09:30:40.000000000 +0100
++++ linux-2.6.25.20/arch/cris/arch-v10/drivers/Kconfig	2009-02-09 21:23:12.000000000 +0100
+@@ -450,11 +450,18 @@
+ 	  i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
+ 	  val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);
+ 
++config ETRAX_I2C_GVC
++	bool "I2C GVC support"
++	depends on ETRAX_ARCH_V10 && !ETRAX_I2C
++	select ETRAX_I2C_USES_PB_NOT_PB_I2C
++	help
++	  Enables an I2C driver with Geert Vancompernolle improvement.
++
+ # this is true for most products since PB-I2C seems to be somewhat
+ # flawed..
+ config ETRAX_I2C_USES_PB_NOT_PB_I2C
+ 	bool "I2C uses PB not PB-I2C"
+-	depends on ETRAX_I2C
++	depends on ETRAX_I2C || ETRAX_I2C_GVC
+ 	help
+ 	  Select whether to use the special I2C mode in the PB I/O register or
+ 	  not.  This option needs to be selected in order to use some drivers
+@@ -478,7 +485,7 @@
+ 
+ config ETRAX_I2C_EEPROM
+ 	bool "I2C EEPROM (non-volatile RAM) support"
+-	depends on ETRAX_I2C
++	depends on ETRAX_I2C || ETRAX_I2C_GVC
+ 	help
+ 	  Enables I2C EEPROM (non-volatile RAM) on PB0 and PB1 using the I2C
+ 	  driver.  Select size option: Probed, 2k, 8k, 16k.
+Index: linux-2.6.25.20/arch/cris/arch-v10/drivers/Makefile
+===================================================================
+--- linux-2.6.25.20.orig/arch/cris/arch-v10/drivers/Makefile	2009-02-09 09:30:41.000000000 +0100
++++ linux-2.6.25.20/arch/cris/arch-v10/drivers/Makefile	2009-02-09 09:35:39.000000000 +0100
+@@ -4,6 +4,7 @@
+ 
+ obj-$(CONFIG_ETRAX_AXISFLASHMAP)	+= axisflashmap.o
+ obj-$(CONFIG_ETRAX_I2C)			+= i2c.o
++obj-$(CONFIG_ETRAX_I2C_GVC)		+= i2c_gvc.o
+ obj-$(CONFIG_ETRAX_I2C_EEPROM)		+= eeprom.o
+ obj-$(CONFIG_ETRAX_GPIO)		+= gpio.o
+ obj-$(CONFIG_ETRAX_DS1302)		+= ds1302.o