From a06752e36be7fc74b4a928026b63b1bf1764497e Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Wed, 29 Sep 2004 22:43:59 +0000
Subject: * Patch by Sean Chang, 9 Aug 2004:   - Added I2C support for ML300.  
 - Added support for ML300 to read out its environment information     stored
 on the EEPROM.   - Added support to use board specific parameters as part of 
    U-Boot's environment information.   - Updated MLD files to support
 configuration for new features     above.

* Patches by Travis Sawyer, 5 Aug 2004:
  - Remove incorrect bridge settings for eth group 6
  - Add call to setup bridge in ppc_440x_eth_initialize
  - Fix ppc_440x_eth_init to reset the phy only if its the
    first time through, otherwise, just check the phy for the
    autonegotiated speed/duplex.  This allows the use of netconsole
  - only print the speed/duplex the first time the phy is reset.
---
 board/xilinx/xilinx_iic/xiic_l.c | 484 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 484 insertions(+)
 create mode 100644 board/xilinx/xilinx_iic/xiic_l.c

(limited to 'board/xilinx/xilinx_iic/xiic_l.c')

diff --git a/board/xilinx/xilinx_iic/xiic_l.c b/board/xilinx/xilinx_iic/xiic_l.c
new file mode 100644
index 0000000000..6b7816373e
--- /dev/null
+++ b/board/xilinx/xilinx_iic/xiic_l.c
@@ -0,0 +1,484 @@
+/* $Id: xiic_l.c,v 1.2 2002/12/05 19:32:40 meinelte Exp $ */
+/******************************************************************************
+*
+*	XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
+*	AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
+*	SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
+*	OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
+*	APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
+*	THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
+*	AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
+*	FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
+*	WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
+*	IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
+*	REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
+*	INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+*	FOR A PARTICULAR PURPOSE.
+*
+*	(c) Copyright 2002 Xilinx Inc.
+*	All rights reserved.
+*
+******************************************************************************/
+/*****************************************************************************/
+/**
+*
+* @file xiic_l.c
+*
+* This file contains low-level driver functions that can be used to access the
+* device.  The user should refer to the hardware device specification for more
+* details of the device operation.
+*
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver	Who  Date     Changes
+* ----- --- -------  -----------------------------------------------
+* 1.01b jhl 5/13/02  First release
+* 1.01b jhl 10/14/02 Corrected bug in the receive function, the setup of the
+*		     interrupt status mask was not being done in the loop such
+*		     that a read would sometimes fail on the last byte because
+*		     the transmit error which should have been ignored was
+*		     being used.  This would leave an extra byte in the FIFO
+*		     and the bus throttled such that the next operation would
+*		     also fail.	 Also updated the receive function to not
+*		     disable the device after the last byte until after the
+*		     bus transitions to not busy which is more consistent
+*		     with the expected behavior.
+* 1.01c ecm 12/05/02 new rev
+* </pre>
+*
+****************************************************************************/
+
+/***************************** Include Files *******************************/
+
+#include "xbasic_types.h"
+#include "xio.h"
+#include "xipif_v1_23_b.h"
+#include "xiic_l.h"
+
+/************************** Constant Definitions ***************************/
+
+/**************************** Type Definitions *****************************/
+
+
+/***************** Macros (Inline Functions) Definitions *******************/
+
+
+/******************************************************************************
+*
+* This macro clears the specified interrupt in the IPIF interrupt status
+* register.  It is non-destructive in that the register is read and only the
+* interrupt specified is cleared.  Clearing an interrupt acknowledges it.
+*
+* @param    BaseAddress contains the IPIF registers base address.
+*
+* @param    InterruptMask contains the interrupts to be disabled
+*
+* @return
+*
+* None.
+*
+* @note
+*
+* Signature: void XIic_mClearIisr(u32 BaseAddress,
+*				  u32 InterruptMask);
+*
+******************************************************************************/
+#define XIic_mClearIisr(BaseAddress, InterruptMask)		    \
+    XIIF_V123B_WRITE_IISR((BaseAddress),			    \
+	XIIF_V123B_READ_IISR(BaseAddress) & (InterruptMask))
+
+/******************************************************************************
+*
+* This macro sends the address for a 7 bit address during both read and write
+* operations. It takes care of the details to format the address correctly.
+* This macro is designed to be called internally to the drivers.
+*
+* @param    SlaveAddress contains the address of the slave to send to.
+*
+* @param    Operation indicates XIIC_READ_OPERATION or XIIC_WRITE_OPERATION
+*
+* @return
+*
+* None.
+*
+* @note
+*
+* Signature: void XIic_mSend7BitAddr(u16 SlaveAddress, u8 Operation);
+*
+******************************************************************************/
+#define XIic_mSend7BitAddress(BaseAddress, SlaveAddress, Operation)	    \
+{									    \
+    u8 LocalAddr = (u8)(SlaveAddress << 1);			    \
+    LocalAddr = (LocalAddr & 0xFE) | (Operation);			    \
+    XIo_Out8(BaseAddress + XIIC_DTR_REG_OFFSET, LocalAddr);		    \
+}
+
+/************************** Function Prototypes ****************************/
+
+static unsigned RecvData (u32 BaseAddress, u8 * BufferPtr,
+			  unsigned ByteCount);
+static unsigned SendData (u32 BaseAddress, u8 * BufferPtr,
+			  unsigned ByteCount);
+
+/************************** Variable Definitions **************************/
+
+
+/****************************************************************************/
+/**
+* Receive data as a master on the IIC bus.  This function receives the data
+* using polled I/O and blocks until the data has been received.	 It only
+* supports 7 bit addressing and non-repeated start modes of operation.	The
+* user is responsible for ensuring the bus is not busy if multiple masters
+* are present on the bus.
+*
+* @param    BaseAddress contains the base address of the IIC device.
+* @param    Address contains the 7 bit IIC address of the device to send the
+*	    specified data to.
+* @param    BufferPtr points to the data to be sent.
+* @param    ByteCount is the number of bytes to be sent.
+*
+* @return
+*
+* The number of bytes received.
+*
+* @note
+*
+* None
+*
+******************************************************************************/
+unsigned XIic_Recv (u32 BaseAddress, u8 Address,
+		    u8 * BufferPtr, unsigned ByteCount)
+{
+	u8 CntlReg;
+	unsigned RemainingByteCount;
+
+	/* Tx error is enabled incase the address (7 or 10) has no device to answer
+	 * with Ack. When only one byte of data, must set NO ACK before address goes
+	 * out therefore Tx error must not be enabled as it will go off immediately
+	 * and the Rx full interrupt will be checked.  If full, then the one byte
+	 * was received and the Tx error will be disabled without sending an error
+	 * callback msg.
+	 */
+	XIic_mClearIisr (BaseAddress,
+			 XIIC_INTR_RX_FULL_MASK | XIIC_INTR_TX_ERROR_MASK |
+			 XIIC_INTR_ARB_LOST_MASK);
+
+	/* Set receive FIFO occupancy depth for 1 byte (zero based)
+	 */
+	XIo_Out8 (BaseAddress + XIIC_RFD_REG_OFFSET, 0);
+
+	/* 7 bit slave address, send the address for a read operation
+	 * and set the state to indicate the address has been sent
+	 */
+	XIic_mSend7BitAddress (BaseAddress, Address, XIIC_READ_OPERATION);
+
+	/* MSMS gets set after putting data in FIFO. Start the master receive
+	 * operation by setting CR Bits MSMS to Master, if the buffer is only one
+	 * byte, then it should not be acknowledged to indicate the end of data
+	 */
+	CntlReg = XIIC_CR_MSMS_MASK | XIIC_CR_ENABLE_DEVICE_MASK;
+	if (ByteCount == 1) {
+		CntlReg |= XIIC_CR_NO_ACK_MASK;
+	}
+
+	/* Write out the control register to start receiving data and call the
+	 * function to receive each byte into the buffer
+	 */
+	XIo_Out8 (BaseAddress + XIIC_CR_REG_OFFSET, CntlReg);
+
+	/* Clear the latched interrupt status for the bus not busy bit which must
+	 * be done while the bus is busy
+	 */
+	XIic_mClearIisr (BaseAddress, XIIC_INTR_BNB_MASK);
+
+	/* Try to receive the data from the IIC bus */
+
+	RemainingByteCount = RecvData (BaseAddress, BufferPtr, ByteCount);
+	/*
+	 * The receive is complete, disable the IIC device and return the number of
+	 * bytes that was received
+	 */
+	XIo_Out8 (BaseAddress + XIIC_CR_REG_OFFSET, 0);
+
+	/* Return the number of bytes that was received */
+
+	return ByteCount - RemainingByteCount;
+}
+
+/******************************************************************************
+*
+* Receive the specified data from the device that has been previously addressed
+* on the IIC bus.  This function assumes that the 7 bit address has been sent
+* and it should wait for the transmit of the address to complete.
+*
+* @param    BaseAddress contains the base address of the IIC device.
+* @param    BufferPtr points to the buffer to hold the data that is received.
+* @param    ByteCount is the number of bytes to be received.
+*
+* @return
+*
+* The number of bytes remaining to be received.
+*
+* @note
+*
+* This function does not take advantage of the receive FIFO because it is
+* designed for minimal code space and complexity.  It contains loops that
+* that could cause the function not to return if the hardware is not working.
+*
+* This function assumes that the calling function will disable the IIC device
+* after this function returns.
+*
+******************************************************************************/
+static unsigned RecvData (u32 BaseAddress, u8 * BufferPtr, unsigned ByteCount)
+{
+	u8 CntlReg;
+	u32 IntrStatusMask;
+	u32 IntrStatus;
+
+	/* Attempt to receive the specified number of bytes on the IIC bus */
+
+	while (ByteCount > 0) {
+		/* Setup the mask to use for checking errors because when receiving one
+		 * byte OR the last byte of a multibyte message an error naturally
+		 * occurs when the no ack is done to tell the slave the last byte
+		 */
+		if (ByteCount == 1) {
+			IntrStatusMask =
+				XIIC_INTR_ARB_LOST_MASK | XIIC_INTR_BNB_MASK;
+		} else {
+			IntrStatusMask =
+				XIIC_INTR_ARB_LOST_MASK |
+				XIIC_INTR_TX_ERROR_MASK | XIIC_INTR_BNB_MASK;
+		}
+
+		/* Wait for the previous transmit and the 1st receive to complete
+		 * by checking the interrupt status register of the IPIF
+		 */
+		while (1) {
+			IntrStatus = XIIF_V123B_READ_IISR (BaseAddress);
+			if (IntrStatus & XIIC_INTR_RX_FULL_MASK) {
+				break;
+			}
+			/* Check the transmit error after the receive full because when
+			 * sending only one byte transmit error will occur because of the
+			 * no ack to indicate the end of the data
+			 */
+			if (IntrStatus & IntrStatusMask) {
+				return ByteCount;
+			}
+		}
+
+		CntlReg = XIo_In8 (BaseAddress + XIIC_CR_REG_OFFSET);
+
+		/* Special conditions exist for the last two bytes so check for them
+		 * Note that the control register must be setup for these conditions
+		 * before the data byte which was already received is read from the
+		 * receive FIFO (while the bus is throttled
+		 */
+		if (ByteCount == 1) {
+			/* For the last data byte, it has already been read and no ack
+			 * has been done, so clear MSMS while leaving the device enabled
+			 * so it can get off the IIC bus appropriately with a stop.
+			 */
+			XIo_Out8 (BaseAddress + XIIC_CR_REG_OFFSET,
+				  XIIC_CR_ENABLE_DEVICE_MASK);
+		}
+
+		/* Before the last byte is received, set NOACK to tell the slave IIC
+		 * device that it is the end, this must be done before reading the byte
+		 * from the FIFO
+		 */
+		if (ByteCount == 2) {
+			/* Write control reg with NO ACK allowing last byte to
+			 * have the No ack set to indicate to slave last byte read.
+			 */
+			XIo_Out8 (BaseAddress + XIIC_CR_REG_OFFSET,
+				  CntlReg | XIIC_CR_NO_ACK_MASK);
+		}
+
+		/* Read in data from the FIFO and unthrottle the bus such that the
+		 * next byte is read from the IIC bus
+		 */
+		*BufferPtr++ = XIo_In8 (BaseAddress + XIIC_DRR_REG_OFFSET);
+
+		/* Clear the latched interrupt status so that it will be updated with
+		 * the new state when it changes, this must be done after the receive
+		 * register is read
+		 */
+		XIic_mClearIisr (BaseAddress, XIIC_INTR_RX_FULL_MASK |
+				 XIIC_INTR_TX_ERROR_MASK |
+				 XIIC_INTR_ARB_LOST_MASK);
+		ByteCount--;
+	}
+
+	/* Wait for the bus to transition to not busy before returning, the IIC
+	 * device cannot be disabled until this occurs.	 It should transition as
+	 * the MSMS bit of the control register was cleared before the last byte
+	 * was read from the FIFO.
+	 */
+	while (1) {
+		if (XIIF_V123B_READ_IISR (BaseAddress) & XIIC_INTR_BNB_MASK) {
+			break;
+		}
+	}
+
+	return ByteCount;
+}
+
+/****************************************************************************/
+/**
+* Send data as a master on the IIC bus.	 This function sends the data
+* using polled I/O and blocks until the data has been sent.  It only supports
+* 7 bit addressing and non-repeated start modes of operation.  The user is
+* responsible for ensuring the bus is not busy if multiple masters are present
+* on the bus.
+*
+* @param    BaseAddress contains the base address of the IIC device.
+* @param    Address contains the 7 bit IIC address of the device to send the
+*	    specified data to.
+* @param    BufferPtr points to the data to be sent.
+* @param    ByteCount is the number of bytes to be sent.
+*
+* @return
+*
+* The number of bytes sent.
+*
+* @note
+*
+* None
+*
+******************************************************************************/
+unsigned XIic_Send (u32 BaseAddress, u8 Address,
+		    u8 * BufferPtr, unsigned ByteCount)
+{
+	unsigned RemainingByteCount;
+
+	/* Put the address into the FIFO to be sent and indicate that the operation
+	 * to be performed on the bus is a write operation
+	 */
+	XIic_mSend7BitAddress (BaseAddress, Address, XIIC_WRITE_OPERATION);
+
+	/* Clear the latched interrupt status so that it will be updated with the
+	 * new state when it changes, this must be done after the address is put
+	 * in the FIFO
+	 */
+	XIic_mClearIisr (BaseAddress, XIIC_INTR_TX_EMPTY_MASK |
+			 XIIC_INTR_TX_ERROR_MASK | XIIC_INTR_ARB_LOST_MASK);
+
+	/* MSMS must be set after putting data into transmit FIFO, indicate the
+	 * direction is transmit, this device is master and enable the IIC device
+	 */
+	XIo_Out8 (BaseAddress + XIIC_CR_REG_OFFSET,
+		  XIIC_CR_MSMS_MASK | XIIC_CR_DIR_IS_TX_MASK |
+		  XIIC_CR_ENABLE_DEVICE_MASK);
+
+	/* Clear the latched interrupt
+	 * status for the bus not busy bit which must be done while the bus is busy
+	 */
+	XIic_mClearIisr (BaseAddress, XIIC_INTR_BNB_MASK);
+
+	/* Send the specified data to the device on the IIC bus specified by the
+	 * the address
+	 */
+	RemainingByteCount = SendData (BaseAddress, BufferPtr, ByteCount);
+
+	/*
+	 * The send is complete, disable the IIC device and return the number of
+	 * bytes that was sent
+	 */
+	XIo_Out8 (BaseAddress + XIIC_CR_REG_OFFSET, 0);
+
+	return ByteCount - RemainingByteCount;
+}
+
+/******************************************************************************
+*
+* Send the specified buffer to the device that has been previously addressed
+* on the IIC bus.  This function assumes that the 7 bit address has been sent
+* and it should wait for the transmit of the address to complete.
+*
+* @param    BaseAddress contains the base address of the IIC device.
+* @param    BufferPtr points to the data to be sent.
+* @param    ByteCount is the number of bytes to be sent.
+*
+* @return
+*
+* The number of bytes remaining to be sent.
+*
+* @note
+*
+* This function does not take advantage of the transmit FIFO because it is
+* designed for minimal code space and complexity.  It contains loops that
+* that could cause the function not to return if the hardware is not working.
+*
+******************************************************************************/
+static unsigned SendData (u32 BaseAddress, u8 * BufferPtr, unsigned ByteCount)
+{
+	u32 IntrStatus;
+
+	/* Send the specified number of bytes in the specified buffer by polling
+	 * the device registers and blocking until complete
+	 */
+	while (ByteCount > 0) {
+		/* Wait for the transmit to be empty before sending any more data
+		 * by polling the interrupt status register
+		 */
+		while (1) {
+			IntrStatus = XIIF_V123B_READ_IISR (BaseAddress);
+
+			if (IntrStatus & (XIIC_INTR_TX_ERROR_MASK |
+					  XIIC_INTR_ARB_LOST_MASK |
+					  XIIC_INTR_BNB_MASK)) {
+				return ByteCount;
+			}
+
+			if (IntrStatus & XIIC_INTR_TX_EMPTY_MASK) {
+				break;
+			}
+		}
+		/* If there is more than one byte to send then put the next byte to send
+		 * into the transmit FIFO
+		 */
+		if (ByteCount > 1) {
+			XIo_Out8 (BaseAddress + XIIC_DTR_REG_OFFSET,
+				  *BufferPtr++);
+		} else {
+			/* Set the stop condition before sending the last byte of data so that
+			 * the stop condition will be generated immediately following the data
+			 * This is done by clearing the MSMS bit in the control register.
+			 */
+			XIo_Out8 (BaseAddress + XIIC_CR_REG_OFFSET,
+				  XIIC_CR_ENABLE_DEVICE_MASK |
+				  XIIC_CR_DIR_IS_TX_MASK);
+
+			/* Put the last byte to send in the transmit FIFO */
+
+			XIo_Out8 (BaseAddress + XIIC_DTR_REG_OFFSET,
+				  *BufferPtr++);
+		}
+
+		/* Clear the latched interrupt status register and this must be done after
+		 * the transmit FIFO has been written to or it won't clear
+		 */
+		XIic_mClearIisr (BaseAddress, XIIC_INTR_TX_EMPTY_MASK);
+
+		/* Update the byte count to reflect the byte sent and clear the latched
+		 * interrupt status so it will be updated for the new state
+		 */
+		ByteCount--;
+	}
+
+	/* Wait for the bus to transition to not busy before returning, the IIC
+	 * device cannot be disabled until this occurs.
+	 * Note that this is different from a receive operation because the stop
+	 * condition causes the bus to go not busy.
+	 */
+	while (1) {
+		if (XIIF_V123B_READ_IISR (BaseAddress) & XIIC_INTR_BNB_MASK) {
+			break;
+		}
+	}
+
+	return ByteCount;
+}
-- 
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