ChangeSet 1.1419.1.4, 2003/06/11 11:43:02-07:00, peterm at remware.demon.co.uk
[PATCH] I2C: add New bus driver: XSCALE iop3xx
drivers/i2c/Kconfig | 4
drivers/i2c/Makefile | 1
drivers/i2c/i2c-iop3xx.c | 565 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/i2c/i2c-iop3xx.h | 120 +++++++++
4 files changed, 690 insertions(+)
diff -Nru a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
--- a/drivers/i2c/Kconfig Wed Jun 11 13:25:23 2003
+++ b/drivers/i2c/Kconfig Wed Jun 11 13:25:23 2003
@@ -193,6 +193,10 @@
tristate "IBM on-chip I2C Adapter"
depends on I2C_IBM_OCP_ALGO
+config I2C_IOP3XX
+ tristate "Intel XScale IOP3xx on-chip I2C interface"
+ depends on ARCH_IOP3XX && I2C
+
config I2C_CHARDEV
tristate "I2C device interface"
depends on I2C
diff -Nru a/drivers/i2c/Makefile b/drivers/i2c/Makefile
--- a/drivers/i2c/Makefile Wed Jun 11 13:25:23 2003
+++ b/drivers/i2c/Makefile Wed Jun 11 13:25:23 2003
@@ -16,4 +16,5 @@
obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
obj-$(CONFIG_I2C_SENSOR) += i2c-sensor.o
+obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
obj-y += busses/ chips/
diff -Nru a/drivers/i2c/i2c-iop3xx.c b/drivers/i2c/i2c-iop3xx.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/i2c/i2c-iop3xx.c Wed Jun 11 13:25:23 2003
@@ -0,0 +1,565 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-iop3xx.c i2c driver algorithms for Intel XScale IOP3xx */
+/* ------------------------------------------------------------------------- */
+/* Copyright (C) 2003 Peter Milne, D-TACQ Solutions Ltd
+ * <Peter dot Milne at D hyphen TACQ dot com>
+
+ 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, version 2.
+
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+/* ------------------------------------------------------------------------- */
+/*
+ With acknowledgements to i2c-algo-ibm_ocp.c by
+ Ian DaSilva, MontaVista Software, Inc. idasilva at mvista.com
+
+ And i2c-algo-pcf.c, which was created by Simon G. Vogl and Hans Berglund:
+
+ Copyright (C) 1995-1997 Simon G. Vogl, 1998-2000 Hans Berglund
+
+ And which acknowledged Ky?sti M?lkki <kmalkki at cc.hut.fi>,
+ Frodo Looijaard <frodol at dds.nl>, Martin Bailey<mbailey at littlefeet-inc.com>
+
+ ---------------------------------------------------------------------------*/
+
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+
+
+#include <asm/arch-iop3xx/iop321.h>
+#include <asm/arch-iop3xx/iop321-irqs.h>
+#include "i2c-iop3xx.h"
+
+
+/* ----- global defines ----------------------------------------------- */
+#define PASSERT(x) do { if (!(x) ) \
+ printk(KERN_CRIT "PASSERT %s in %s:%d\n", #x, __FILE__, __LINE__ );\
+ } while (0)
+
+
+/* ----- global variables --------------------------------------------- */
+
+
+static inline unsigned char iic_cook_addr(struct i2c_msg *msg)
+{
+ unsigned char addr;
+
+ addr = ( msg->addr << 1 );
+
+ if (msg->flags & I2C_M_RD )
+ addr |= 1;
+
+/* PGM: what is M_REV_DIR_ADDR - do we need it ?? */
+ if (msg->flags & I2C_M_REV_DIR_ADDR )
+ addr ^= 1;
+
+ return addr;
+}
+
+
+static inline void iop3xx_adap_reset(struct i2c_algo_iop3xx_data *iop3xx_adap)
+{
+ // Follows devman 9.3
+ *iop3xx_adap->biu->CR = IOP321_ICR_UNIT_RESET;
+ *iop3xx_adap->biu->SR = IOP321_ISR_CLEARBITS;
+ *iop3xx_adap->biu->CR = 0;
+}
+
+static inline void iop3xx_adap_set_slave_addr(
+ struct i2c_algo_iop3xx_data *iop3xx_adap )
+{
+ *iop3xx_adap->biu->SAR = MYSAR;
+}
+
+static inline void iop3xx_adap_enable(
+ struct i2c_algo_iop3xx_data *iop3xx_adap )
+{
+ u32 cr = IOP321_ICR_GCD|IOP321_ICR_SCLEN|IOP321_ICR_UE;
+
+/* NB SR bits not same position as CR IE bits :-( */
+ iop3xx_adap->biu->SR_enabled =
+ IOP321_ISR_ALD|IOP321_ISR_BERRD|
+ IOP321_ISR_RXFULL|IOP321_ISR_TXEMPTY;
+
+ cr |= IOP321_ICR_ALDIE|IOP321_ICR_BERRIE|
+ IOP321_ICR_RXFULLIE|IOP321_ICR_TXEMPTYIE;
+
+ *iop3xx_adap->biu->CR = cr;
+}
+
+static void iop3xx_adap_transaction_cleanup(
+ struct i2c_algo_iop3xx_data *iop3xx_adap )
+{
+ unsigned cr = *iop3xx_adap->biu->CR;
+
+ cr &= ~(IOP321_ICR_MSTART | IOP321_ICR_TBYTE |
+ IOP321_ICR_MSTOP | IOP321_ICR_SCLEN );
+ *iop3xx_adap->biu->CR = cr;
+}
+
+static void iop3xx_adap_final_cleanup(
+ struct i2c_algo_iop3xx_data *iop3xx_adap )
+{
+ unsigned cr = *iop3xx_adap->biu->CR;
+
+ cr &= ~(IOP321_ICR_ALDIE|IOP321_ICR_BERRIE|
+ IOP321_ICR_RXFULLIE|IOP321_ICR_TXEMPTYIE);
+ iop3xx_adap->biu->SR_enabled = 0;
+ *iop3xx_adap->biu->CR = cr;
+}
+
+
+
+static void iop3xx_i2c_handler( int this_irq,
+ void *dev_id,
+ struct pt_regs *regs)
+/*
+ * NB: the handler has to clear the source of the interrupt!
+ * Then it passes the SR flags of interest to BH via adap data
+ */
+{
+ struct i2c_algo_iop3xx_data *iop3xx_adap = dev_id;
+
+ u32 sr = *iop3xx_adap->biu->SR;
+
+ if ( (sr &= iop3xx_adap->biu->SR_enabled) ){
+ *iop3xx_adap->biu->SR = sr;
+ iop3xx_adap->biu->SR_received |= sr;
+ wake_up_interruptible(&iop3xx_adap->waitq);
+ }
+}
+
+
+static int iop3xx_adap_error( u32 sr )
+// check all error conditions, clear them , report most important
+{
+ int rc = 0;
+
+ if ( (sr&IOP321_ISR_BERRD) ) {
+ if ( !rc ) rc = -I2C_ERR_BERR;
+ }
+ if ( (sr&IOP321_ISR_ALD) ){
+ if ( !rc ) rc = -I2C_ERR_ALD;
+ }
+ return rc;
+}
+
+static inline u32 get_srstat( struct i2c_algo_iop3xx_data *iop3xx_adap )
+{
+ unsigned long flags;
+ u32 sr;
+
+ spin_lock_irqsave( &iop3xx_adap->lock, flags );
+ sr = iop3xx_adap->biu->SR_received;
+ iop3xx_adap->biu->SR_received = 0;
+ spin_unlock_irqrestore( &iop3xx_adap->lock, flags );
+
+ return sr;
+}
+
+/*
+ * sleep until interrupted, then recover and analyse the SR
+ * saved by handler
+ */
+typedef int (* CompareFunc)( unsigned test, unsigned mask );
+/* returns 1 on correct comparison */
+
+static int iop3xx_adap_wait_event( struct i2c_algo_iop3xx_data *iop3xx_adap,
+ unsigned flags, unsigned* status,
+ CompareFunc compare )
+{
+ unsigned sr = 0;
+ int interrupted;
+ int done;
+ int rc;
+
+ do {
+ interrupted = wait_event_interruptible_timeout (
+ iop3xx_adap->waitq,
+ (done = compare( sr = get_srstat(iop3xx_adap),flags )),
+ iop3xx_adap->timeout
+ );
+ if ( (rc = iop3xx_adap_error( sr )) < 0 ){
+ *status = sr;
+ return rc;
+ }else if ( !interrupted ){
+ *status = sr;
+ return rc = -ETIMEDOUT;
+ }
+ } while( !done );
+
+ *status = sr;
+
+ return rc = 0;
+}
+
+
+
+
+/*
+ * Concrete CompareFuncs
+ */
+static int all_bits_clear( unsigned test, unsigned mask ) {
+ return (test&mask) == 0;
+}
+static int any_bits_set( unsigned test, unsigned mask ) {
+ return (test&mask) != 0;
+}
+
+
+static int iop3xx_adap_wait_tx_done(
+ struct i2c_algo_iop3xx_data *iop3xx_adap, int *status)
+{
+ return iop3xx_adap_wait_event(
+ iop3xx_adap,
+ IOP321_ISR_TXEMPTY|IOP321_ISR_ALD|IOP321_ISR_BERRD,
+ status, any_bits_set );
+}
+
+static int iop3xx_adap_wait_rx_done(
+ struct i2c_algo_iop3xx_data *iop3xx_adap, int *status)
+{
+ return iop3xx_adap_wait_event(
+ iop3xx_adap,
+ IOP321_ISR_RXFULL|IOP321_ISR_ALD|IOP321_ISR_BERRD,
+ status, any_bits_set );
+}
+
+static int iop3xx_adap_wait_idle(
+ struct i2c_algo_iop3xx_data *iop3xx_adap, int *status)
+{
+ return iop3xx_adap_wait_event(
+ iop3xx_adap, IOP321_ISR_UNITBUSY, status, all_bits_clear );
+}
+
+//
+// Description: This performs the IOP3xx initialization sequence
+// Valid for IOP321. Maybe valid for IOP310?.
+//
+static int iop3xx_adap_init (struct i2c_algo_iop3xx_data *iop3xx_adap)
+{
+ *IOP321_GPOD &= ~(iop3xx_adap->channel==0?
+ IOP321_GPOD_I2C0:
+ IOP321_GPOD_I2C1);
+
+ iop3xx_adap_reset( iop3xx_adap );
+ iop3xx_adap_set_slave_addr( iop3xx_adap );
+ iop3xx_adap_enable( iop3xx_adap );
+
+ return 0;
+}
+
+static int iop3xx_adap_send_target_slave_addr(
+ struct i2c_algo_iop3xx_data *iop3xx_adap, struct i2c_msg* msg )
+{
+ unsigned cr = *iop3xx_adap->biu->CR;
+ int status;
+ int rc;
+
+ *iop3xx_adap->biu->DBR = iic_cook_addr( msg );
+
+ cr &= ~(IOP321_ICR_MSTOP|IOP321_ICR_NACK);
+ cr |= IOP321_ICR_MSTART | IOP321_ICR_TBYTE;
+
+ *iop3xx_adap->biu->CR = cr;
+ rc = iop3xx_adap_wait_tx_done( iop3xx_adap, &status );
+/* this assert fires every time, contrary to IOP manual
+ PASSERT( (status&IOP321_ISR_UNITBUSY)!=0 );
+*/
+ PASSERT( (status&IOP321_ISR_RXREAD)==0 );
+
+ return rc;
+}
+
+static int iop3xx_adap_write_byte(
+ struct i2c_algo_iop3xx_data *iop3xx_adap, char byte, int stop )
+{
+ unsigned cr = *iop3xx_adap->biu->CR;
+ int status;
+ int rc;
+
+ *iop3xx_adap->biu->DBR = byte;
+ cr &= ~IOP321_ICR_MSTART;
+ if ( stop ){
+ cr |= IOP321_ICR_MSTOP;
+ }else{
+ cr &= ~IOP321_ICR_MSTOP;
+ }
+ *iop3xx_adap->biu->CR = cr |= IOP321_ICR_TBYTE;
+ rc = iop3xx_adap_wait_tx_done( iop3xx_adap, &status );
+
+ return rc;
+}
+
+static int iop3xx_adap_read_byte(
+ struct i2c_algo_iop3xx_data *iop3xx_adap, char* byte, int stop )
+{
+ unsigned cr = *iop3xx_adap->biu->CR;
+ int status;
+ int rc;
+
+ cr &= ~IOP321_ICR_MSTART;
+
+ if ( stop ){
+ cr |= IOP321_ICR_MSTOP|IOP321_ICR_NACK;
+ }else{
+ cr &= ~(IOP321_ICR_MSTOP|IOP321_ICR_NACK);
+ }
+ *iop3xx_adap->biu->CR = cr |= IOP321_ICR_TBYTE;
+
+ rc = iop3xx_adap_wait_rx_done( iop3xx_adap, &status );
+
+ *byte = *iop3xx_adap->biu->DBR;
+
+ return rc;
+}
+
+
+static int iop3xx_i2c_writebytes( struct i2c_adapter *i2c_adap,
+ const char *buf, int count )
+{
+ struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
+ int ii;
+ int rc = 0;
+
+ for ( ii = 0; rc == 0 && ii != count; ++ii ){
+ rc = iop3xx_adap_write_byte(iop3xx_adap, buf[ii], ii==count-1);
+ }
+ return rc;
+}
+
+
+static int iop3xx_i2c_readbytes( struct i2c_adapter *i2c_adap,
+ char *buf, int count )
+{
+ struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
+ int ii;
+ int rc = 0;
+
+ for ( ii = 0; rc == 0 && ii != count; ++ii ){
+ rc = iop3xx_adap_read_byte(iop3xx_adap, &buf[ii], ii==count-1);
+ }
+ return rc;
+}
+
+
+/*
+ * Description: This function implements combined transactions. Combined
+ * transactions consist of combinations of reading and writing blocks of data.
+ * FROM THE SAME ADDRESS
+ * Each transfer (i.e. a read or a write) is separated by a repeated start
+ * condition.
+ */
+
+static int iop3xx_handle_msg(
+ struct i2c_adapter *i2c_adap, struct i2c_msg* pmsg )
+{
+ struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
+ int rc;
+
+ rc = iop3xx_adap_send_target_slave_addr( iop3xx_adap, pmsg );
+ if ( rc < 0 ){
+ return rc;
+ }
+
+ if ( (pmsg->flags&I2C_M_RD) ){
+ return iop3xx_i2c_readbytes( i2c_adap, pmsg->buf, pmsg->len );
+ }else{
+ return iop3xx_i2c_writebytes( i2c_adap, pmsg->buf, pmsg->len );
+ }
+}
+
+
+
+/*
+ * master_xfer() - main read/write entry
+ */
+static int iop3xx_master_xfer(
+ struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num )
+{
+ struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
+ int im = 0;
+ int ret = 0;
+ int status;
+
+ iop3xx_adap_wait_idle( iop3xx_adap, &status );
+ iop3xx_adap_reset( iop3xx_adap );
+ iop3xx_adap_enable( iop3xx_adap );
+
+ for ( im = 0; ret == 0 && im != num; ++im ){
+ ret = iop3xx_handle_msg( i2c_adap, &msgs[im] );
+ }
+
+ iop3xx_adap_transaction_cleanup( iop3xx_adap );
+
+ return ret;
+}
+
+
+
+static int algo_control(struct i2c_adapter *adapter,
+ unsigned int cmd, unsigned long arg)
+{
+ return 0;
+}
+
+
+static u32 iic_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C|I2C_FUNC_SMBUS_EMUL;
+}
+
+
+/* -----exported algorithm data: ------------------------------------- */
+
+static struct i2c_algorithm iic_algo = {
+ .name = "IOP3xx I2C algorithm",
+ .id = I2C_ALGO_OCP_IOP3XX,
+ .master_xfer = iop3xx_master_xfer,
+ .algo_control = algo_control,
+ .functionality = iic_func,
+};
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+
+
+static int i2c_iop3xx_add_bus(struct i2c_adapter *iic_adap)
+{
+ struct i2c_algo_iop3xx_data *iop3xx_adap = iic_adap->algo_data;
+
+ if ( !request_region( REGION_START(iop3xx_adap),
+ REGION_LENGTH(iop3xx_adap),
+ iic_adap->name ) ){
+ return -ENODEV;
+ }
+
+ init_waitqueue_head( &iop3xx_adap->waitq );
+ spin_lock_init( &iop3xx_adap->lock );
+
+ if ( request_irq(
+ iop3xx_adap->biu->irq,
+ iop3xx_i2c_handler,
+ /* SA_SAMPLE_RANDOM */ 0,
+ iic_adap->name,
+ iop3xx_adap ) ){
+ return -ENODEV;
+ }
+
+/* register new iic_adapter to i2c module... */
+
+ iic_adap->id |= iic_algo.id;
+ iic_adap->algo = &iic_algo;
+
+ iic_adap->timeout = 100; /* default values, should */
+ iic_adap->retries = 3; /* be replaced by defines */
+
+ iop3xx_adap_init( iic_adap->algo_data );
+ i2c_add_adapter(iic_adap);
+ return 0;
+}
+
+
+static int i2c_iop3xx_del_bus(struct i2c_adapter *iic_adap)
+{
+ struct i2c_algo_iop3xx_data *iop3xx_adap = iic_adap->algo_data;
+
+ iop3xx_adap_final_cleanup( iop3xx_adap );
+ free_irq( iop3xx_adap->biu->irq, iop3xx_adap );
+
+ release_region( REGION_START(iop3xx_adap), REGION_LENGTH(iop3xx_adap));
+
+ return i2c_del_adapter( iic_adap );
+}
+
+#ifdef CONFIG_ARCH_IOP321
+
+static struct iop3xx_biu biu0 = {
+ .CR = IOP321_ICR0,
+ .SR = IOP321_ISR0,
+ .SAR = IOP321_ISAR0,
+ .DBR = IOP321_IDBR0,
+ .BMR = IOP321_IBMR0,
+ .irq = IRQ_IOP321_I2C_0
+};
+
+static struct iop3xx_biu biu1 = {
+ .CR = IOP321_ICR1,
+ .SR = IOP321_ISR1,
+ .SAR = IOP321_ISAR1,
+ .DBR = IOP321_IDBR1,
+ .BMR = IOP321_IBMR1,
+ .irq = IRQ_IOP321_I2C_1
+};
+
+#define ADAPTER_NAME_ROOT "IOP321 i2c biu adapter "
+#else
+#error Please define the BIU struct iop3xx_biu for your processor arch
+#endif
+
+static struct i2c_algo_iop3xx_data algo_iop3xx_data0 = {
+ .channel = 0,
+ .biu = &biu0,
+ .timeout = 1*HZ
+};
+static struct i2c_algo_iop3xx_data algo_iop3xx_data1 = {
+ .channel = 1,
+ .biu = &biu1,
+ .timeout = 1*HZ
+};
+
+static struct i2c_adapter iop3xx_ops0 = {
+ .owner = THIS_MODULE,
+ .name = ADAPTER_NAME_ROOT "0",
+ .id = I2C_HW_IOP321,
+ .algo_data = &algo_iop3xx_data0
+};
+static struct i2c_adapter iop3xx_ops1 = {
+ .owner = THIS_MODULE,
+ .name = ADAPTER_NAME_ROOT "1",
+ .id = I2C_HW_IOP321,
+ .algo_data = &algo_iop3xx_data1
+};
+
+static int __init i2c_iop3xx_init (void)
+{
+ return i2c_iop3xx_add_bus(&iop3xx_ops0) ||
+ i2c_iop3xx_add_bus(&iop3xx_ops1);
+}
+
+static void __exit i2c_iop3xx_exit (void)
+{
+ i2c_iop3xx_del_bus(&iop3xx_ops0);
+ i2c_iop3xx_del_bus(&iop3xx_ops1);
+}
+
+module_init (i2c_iop3xx_init);
+module_exit (i2c_iop3xx_exit);
+
+MODULE_AUTHOR("D-TACQ Solutions Ltd <www.d-tacq.com>");
+MODULE_DESCRIPTION("IOP3xx iic algorithm and driver");
+MODULE_LICENSE("GPL");
+
+MODULE_PARM(i2c_debug,"i");
+
+MODULE_PARM_DESC(i2c_debug,
+ "debug level - 0 off; 1 normal; 2,3 more verbose; 9 iic-protocol");
+
diff -Nru a/drivers/i2c/i2c-iop3xx.h b/drivers/i2c/i2c-iop3xx.h
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/i2c/i2c-iop3xx.h Wed Jun 11 13:25:23 2003
@@ -0,0 +1,120 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-iop3xx.h algorithm driver definitions private to i2c-iop3xx.c */
+/* ------------------------------------------------------------------------- */
+/* Copyright (C) 2003 Peter Milne, D-TACQ Solutions Ltd
+ * <Peter dot Milne at D hyphen TACQ dot com>
+
+ 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, version 2.
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+/* ------------------------------------------------------------------------- */
+
+
+#ifndef I2C_IOP3XX_H
+#define I2C_IOP3XX_H 1
+
+/*
+ * iop321 hardware bit definitions
+ */
+#define IOP321_ICR_FAST_MODE 0x8000 /* 1=400kBps, 0=100kBps */
+#define IOP321_ICR_UNIT_RESET 0x4000 /* 1=RESET */
+#define IOP321_ICR_SADIE 0x2000 /* 1=Slave Detect Interrupt Enable */
+#define IOP321_ICR_ALDIE 0x1000 /* 1=Arb Loss Detect Interrupt Enable */
+#define IOP321_ICR_SSDIE 0x0800 /* 1=Slave STOP Detect Interrupt Enable */
+#define IOP321_ICR_BERRIE 0x0400 /* 1=Bus Error Interrupt Enable */
+#define IOP321_ICR_RXFULLIE 0x0200 /* 1=Receive Full Interrupt Enable */
+#define IOP321_ICR_TXEMPTYIE 0x0100 /* 1=Transmit Empty Interrupt Enable */
+#define IOP321_ICR_GCD 0x0080 /* 1=General Call Disable */
+/*
+ * IOP321_ICR_GCD: 1 disables response as slave. "This bit must be set
+ * when sending a master mode general call message from the I2C unit"
+ */
+#define IOP321_ICR_UE 0x0040 /* 1=Unit Enable */
+/*
+ * "NOTE: To avoid I2C bus integrity problems,
+ * the user needs to ensure that the GPIO Output Data Register -
+ * GPOD bits associated with an I2C port are cleared prior to setting
+ * the enable bit for that I2C serial port.
+ * The user prepares to enable I2C port 0 and
+ * I2C port 1 by clearing GPOD bits 7:6 and GPOD bits 5:4, respectively.
+ */
+#define IOP321_ICR_SCLEN 0x0020 /* 1=SCL enable for master mode */
+#define IOP321_ICR_MABORT 0x0010 /* 1=Send a STOP with no data
+ * NB TBYTE must be clear */
+#define IOP321_ICR_TBYTE 0x0008 /* 1=Send/Receive a byte. i2c clears */
+#define IOP321_ICR_NACK 0x0004 /* 1=reply with NACK */
+#define IOP321_ICR_MSTOP 0x0002 /* 1=send a STOP after next data byte */
+#define IOP321_ICR_MSTART 0x0001 /* 1=initiate a START */
+
+
+#define IOP321_ISR_BERRD 0x0400 /* 1=BUS ERROR Detected */
+#define IOP321_ISR_SAD 0x0200 /* 1=Slave ADdress Detected */
+#define IOP321_ISR_GCAD 0x0100 /* 1=General Call Address Detected */
+#define IOP321_ISR_RXFULL 0x0080 /* 1=Receive Full */
+#define IOP321_ISR_TXEMPTY 0x0040 /* 1=Transmit Empty */
+#define IOP321_ISR_ALD 0x0020 /* 1=Arbitration Loss Detected */
+#define IOP321_ISR_SSD 0x0010 /* 1=Slave STOP Detected */
+#define IOP321_ISR_BBUSY 0x0008 /* 1=Bus BUSY */
+#define IOP321_ISR_UNITBUSY 0x0004 /* 1=Unit Busy */
+#define IOP321_ISR_NACK 0x0002 /* 1=Unit Rx or Tx a NACK */
+#define IOP321_ISR_RXREAD 0x0001 /* 1=READ 0=WRITE (R/W bit of slave addr */
+
+#define IOP321_ISR_CLEARBITS 0x07f0
+
+#define IOP321_ISAR_SAMASK 0x007f
+
+#define IOP321_IDBR_MASK 0x00ff
+
+#define IOP321_IBMR_SCL 0x0002
+#define IOP321_IBMR_SDA 0x0001
+
+#define IOP321_GPOD_I2C0 0x00c0 /* clear these bits to enable ch0 */
+#define IOP321_GPOD_I2C1 0x0030 /* clear these bits to enable ch1 */
+
+#define MYSAR 0x02 /* SWAG a suitable slave address */
+
+#define I2C_ERR 321
+#define I2C_ERR_BERR (I2C_ERR+0)
+#define I2C_ERR_ALD (I2C_ERR+1)
+
+
+typedef volatile u32* r32;
+
+struct iop3xx_biu { /* Bus Interface Unit - the hardware */
+/* physical hardware defs - regs*/
+ r32 CR;
+ r32 SR;
+ r32 SAR;
+ r32 DBR;
+ r32 BMR;
+/* irq bit vector */
+ u32 irq;
+/* stored flags */
+ u32 SR_enabled, SR_received;
+};
+
+struct i2c_algo_iop3xx_data {
+ int channel;
+
+ wait_queue_head_t waitq;
+ spinlock_t lock;
+ int timeout;
+ struct iop3xx_biu* biu;
+};
+
+#define REGION_START( adap ) ((u32)((adap)->biu->CR))
+#define REGION_END( adap ) ((u32)((adap)->biu->BMR+1))
+#define REGION_LENGTH( adap ) (REGION_END(adap)-REGION_START(adap))
+
+#define IRQ_STATUS_MASK( adap ) (1<<adap->biu->irq)
+
+#endif /* I2C_IOP3XX_H */
