1 files changed, 532 insertions, 0 deletions
diff --git a/board/Marvell/common/i2c.c b/board/Marvell/common/i2c.c
new file mode 100644
index 0000000..624ee5c
--- /dev/null
+++ b/board/Marvell/common/i2c.c
@@ -0,0 +1,532 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@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
+ *
+ * Hacked for the DB64360 board by Ingo.Assmus@keymile.com
+ * extra improvments by Brain Waite
+ */
+#include <common.h>
+#include <mpc8xx.h>
+#include <malloc.h>
+#include "../include/mv_gen_reg.h"
+#include "../include/core.h"
+
+#define MAX_I2C_RETRYS	    10
+#define I2C_DELAY	    1000	/* Should be at least the # of MHz of Tclk */
+#undef	DEBUG_I2C
+/*#define DEBUG_I2C*/
+
+#ifdef DEBUG_I2C
+#define DP(x) x
+#else
+#define DP(x)
+#endif
+
+/* Assuming that there is only one master on the bus (us) */
+
+static void i2c_init (int speed, int slaveaddr)
+{
+	unsigned int n, m, freq, margin, power;
+	unsigned int actualN = 0, actualM = 0;
+	unsigned int control, status;
+	unsigned int minMargin = 0xffffffff;
+	unsigned int tclk = CFG_TCLK;
+	unsigned int i2cFreq = speed;	/* 100000 max. Fast mode not supported */
+
+	DP (puts ("i2c_init\n"));
+/* gtI2cMasterInit */
+	for (n = 0; n < 8; n++) {
+		for (m = 0; m < 16; m++) {
+			power = 2 << n;	/* power = 2^(n+1) */
+			freq = tclk / (10 * (m + 1) * power);
+			if (i2cFreq > freq)
+				margin = i2cFreq - freq;
+			else
+				margin = freq - i2cFreq;
+			if (margin < minMargin) {
+				minMargin = margin;
+				actualN = n;
+				actualM = m;
+			}
+		}
+	}
+
+	DP (puts ("setup i2c bus\n"));
+
+	/* Setup bus */
+/* gtI2cReset */
+	GT_REG_WRITE (I2C_SOFT_RESET, 0);
+
+	DP (puts ("udelay...\n"));
+
+	udelay (I2C_DELAY);
+
+	DP (puts ("set baudrate\n"));
+
+	GT_REG_WRITE (I2C_STATUS_BAUDE_RATE, (actualM << 3) | actualN);
+	GT_REG_WRITE (I2C_CONTROL, (0x1 << 2) | (0x1 << 6));
+
+	udelay (I2C_DELAY * 10);
+
+	DP (puts ("read control, baudrate\n"));
+
+	GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+	GT_REG_READ (I2C_CONTROL, &control);
+}
+
+static uchar i2c_start (void)
+{				/* DB64360 checked -> ok */
+	unsigned int control, status;
+	int count = 0;
+
+	DP (puts ("i2c_start\n"));
+
+	/* Set the start bit */
+
+/* gtI2cGenerateStartBit() */
+
+	GT_REG_READ (I2C_CONTROL, &control);
+	control |= (0x1 << 5);	/* generate the I2C_START_BIT */
+	GT_REG_WRITE (I2C_CONTROL, control);
+
+	GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+
+	count = 0;
+	while ((status & 0xff) != 0x08) {
+		udelay (I2C_DELAY);
+		if (count > 20) {
+			GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));	/*stop */
+			return (status);
+		}
+		GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+		count++;
+	}
+
+	return (0);
+}
+
+static uchar i2c_select_device (uchar dev_addr, uchar read, int ten_bit)
+{
+	unsigned int status, data, bits = 7;
+	int count = 0;
+
+	DP (puts ("i2c_select_device\n"));
+
+	/* Output slave address */
+
+	if (ten_bit) {
+		bits = 10;
+	}
+
+	data = (dev_addr << 1);
+	/* set the read bit */
+	data |= read;
+	GT_REG_WRITE (I2C_DATA, data);
+	/* assert the address */
+	RESET_REG_BITS (I2C_CONTROL, BIT3);
+
+	udelay (I2C_DELAY);
+
+	GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+	count = 0;
+	while (((status & 0xff) != 0x40) && ((status & 0xff) != 0x18)) {
+		udelay (I2C_DELAY);
+		if (count > 20) {
+			GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));	/*stop */
+			return (status);
+		}
+		GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+		count++;
+	}
+
+	if (bits == 10) {
+		printf ("10 bit I2C addressing not yet implemented\n");
+		return (0xff);
+	}
+
+	return (0);
+}
+
+static uchar i2c_get_data (uchar * return_data, int len)
+{
+
+	unsigned int data, status;
+	int count = 0;
+
+	DP (puts ("i2c_get_data\n"));
+
+	while (len) {
+
+		/* Get and return the data */
+
+		RESET_REG_BITS (I2C_CONTROL, (0x1 << 3));
+
+		udelay (I2C_DELAY * 5);
+
+		GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+		count++;
+		while ((status & 0xff) != 0x50) {
+			udelay (I2C_DELAY);
+			if (count > 2) {
+				GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));	/*stop */
+				return 0;
+			}
+			GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+			count++;
+		}
+		GT_REG_READ (I2C_DATA, &data);
+		len--;
+		*return_data = (uchar) data;
+		return_data++;
+	}
+	RESET_REG_BITS (I2C_CONTROL, BIT2 | BIT3);
+	while ((status & 0xff) != 0x58) {
+		udelay (I2C_DELAY);
+		if (count > 200) {
+			GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));	/*stop */
+			return (status);
+		}
+		GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+		count++;
+	}
+	GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));	/* stop */
+
+	return (0);
+}
+
+static uchar i2c_write_data (unsigned int *data, int len)
+{
+	unsigned int status;
+	int count = 0;
+	unsigned int temp;
+	unsigned int *temp_ptr = data;
+
+	DP (puts ("i2c_write_data\n"));
+
+	while (len) {
+		temp = (unsigned int) (*temp_ptr);
+		GT_REG_WRITE (I2C_DATA, temp);
+		RESET_REG_BITS (I2C_CONTROL, (0x1 << 3));
+
+		udelay (I2C_DELAY);
+
+		GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+		count++;
+		while ((status & 0xff) != 0x28) {
+			udelay (I2C_DELAY);
+			if (count > 20) {
+				GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));	/*stop */
+				return (status);
+			}
+			GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+			count++;
+		}
+		len--;
+		temp_ptr++;
+	}
+/* 11-14-2002 Paul Marchese */
+/* Can't have the write issuing a stop command */
+/* it's wrong to have a stop bit in read stream or write stream */
+/* since we don't know if it's really the end of the command */
+/* or whether we have just send the device address + offset */
+/* we will push issuing the stop command off to the original */
+/* calling function */
+	/* set the interrupt bit in the control register */
+	GT_REG_WRITE (I2C_CONTROL, (0x1 << 3));
+	udelay (I2C_DELAY * 10);
+	return (0);
+}
+
+/* 11-14-2002 Paul Marchese */
+/* created this function to get the i2c_write() */
+/* function working properly. */
+/* function to write bytes out on the i2c bus */
+/* this is identical to the function i2c_write_data() */
+/* except that it requires a buffer that is an */
+/* unsigned character array.  You can't use */
+/* i2c_write_data() to send an array of unsigned characters */
+/* since the byte of interest ends up on the wrong end of the bus */
+/* aah, the joys of big endian versus little endian! */
+/* */
+/* returns 0 = success */
+/*         anything other than zero is failure */
+static uchar i2c_write_byte (unsigned char *data, int len)
+{
+	unsigned int status;
+	int count = 0;
+	unsigned int temp;
+	unsigned char *temp_ptr = data;
+
+	DP (puts ("i2c_write_byte\n"));
+
+	while (len) {
+		/* Set and assert the data */
+		temp = *temp_ptr;
+		GT_REG_WRITE (I2C_DATA, temp);
+		RESET_REG_BITS (I2C_CONTROL, (0x1 << 3));
+
+		udelay (I2C_DELAY);
+
+		GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+		count++;
+		while ((status & 0xff) != 0x28) {
+			udelay (I2C_DELAY);
+			if (count > 20) {
+				GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));	/*stop */
+				return (status);
+			}
+			GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+			count++;
+		}
+		len--;
+		temp_ptr++;
+	}
+/* Can't have the write issuing a stop command */
+/* it's wrong to have a stop bit in read stream or write stream */
+/* since we don't know if it's really the end of the command */
+/* or whether we have just send the device address + offset */
+/* we will push issuing the stop command off to the original */
+/* calling function */
+/*	GT_REG_WRITE(I2C_CONTROL, (0x1 << 3) | (0x1 << 4));
+	GT_REG_WRITE(I2C_CONTROL, (0x1 << 4)); */
+	/* set the interrupt bit in the control register */
+	GT_REG_WRITE (I2C_CONTROL, (0x1 << 3));
+	udelay (I2C_DELAY * 10);
+
+	return (0);
+}
+
+static uchar
+i2c_set_dev_offset (uchar dev_addr, unsigned int offset, int ten_bit,
+		    int alen)
+{
+	uchar status;
+	unsigned int table[2];
+
+/* initialize the table of address offset bytes */
+/* utilized for 2 byte address offsets */
+/* NOTE: the order is high byte first! */
+	table[1] = offset & 0xff;	/* low byte */
+	table[0] = offset / 0x100;	/* high byte */
+
+	DP (puts ("i2c_set_dev_offset\n"));
+
+	status = i2c_select_device (dev_addr, 0, ten_bit);
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Failed to select device setting offset: 0x%02x\n",
+			status);
+#endif
+		return status;
+	}
+/* check the address offset length */
+	if (alen == 0)
+		/* no address offset */
+		return (0);
+	else if (alen == 1) {
+		/* 1 byte address offset */
+		status = i2c_write_data (&offset, 1);
+		if (status) {
+#ifdef DEBUG_I2C
+			printf ("Failed to write data: 0x%02x\n", status);
+#endif
+			return status;
+		}
+	} else if (alen == 2) {
+		/* 2 bytes address offset */
+		status = i2c_write_data (table, 2);
+		if (status) {
+#ifdef DEBUG_I2C
+			printf ("Failed to write data: 0x%02x\n", status);
+#endif
+			return status;
+		}
+	} else {
+		/* address offset unknown or not supported */
+		printf ("Address length offset %d is not supported\n", alen);
+		return 1;
+	}
+	return 0;		/* sucessful completion */
+}
+
+uchar
+i2c_read (uchar dev_addr, unsigned int offset, int alen, uchar * data,
+	  int len)
+{
+	uchar status = 0;
+	unsigned int i2cFreq = CFG_I2C_SPEED;
+
+	DP (puts ("i2c_read\n"));
+
+	i2c_init (i2cFreq, 0);	/* set the i2c frequency */
+
+	status = i2c_start ();
+
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Transaction start failed: 0x%02x\n", status);
+#endif
+		return status;
+	}
+
+	status = i2c_set_dev_offset (dev_addr, offset, 0, alen);	/* send the slave address + offset */
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Failed to set slave address & offset: 0x%02x\n",
+			status);
+#endif
+		return status;
+	}
+
+	i2c_init (i2cFreq, 0);	/* set the i2c frequency again */
+
+	status = i2c_start ();
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Transaction restart failed: 0x%02x\n", status);
+#endif
+		return status;
+	}
+
+	status = i2c_select_device (dev_addr, 1, 0);	/* send the slave address */
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Address not acknowledged: 0x%02x\n", status);
+#endif
+		return status;
+	}
+
+	status = i2c_get_data (data, len);
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Data not recieved: 0x%02x\n", status);
+#endif
+		return status;
+	}
+
+	return 0;
+}
+
+/* 11-14-2002 Paul Marchese */
+/* Function to set the I2C stop bit */
+void i2c_stop (void)
+{
+	GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));
+}
+
+/* 11-14-2002 Paul Marchese */
+/* I2C write function */
+/* dev_addr = device address */
+/* offset = address offset */
+/* alen = length in bytes of the address offset */
+/* data = pointer to buffer to read data into */
+/* len = # of bytes to read */
+/* */
+/* returns 0 = succesful */
+/*         anything but zero is failure */
+uchar
+i2c_write (uchar dev_addr, unsigned int offset, int alen, uchar * data,
+	   int len)
+{
+	uchar status = 0;
+	unsigned int i2cFreq = CFG_I2C_SPEED;
+
+	DP (puts ("i2c_write\n"));
+
+	i2c_init (i2cFreq, 0);	/* set the i2c frequency */
+
+	status = i2c_start ();	/* send a start bit */
+
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Transaction start failed: 0x%02x\n", status);
+#endif
+		return status;
+	}
+
+	status = i2c_set_dev_offset (dev_addr, offset, 0, alen);	/* send the slave address + offset */
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Failed to set slave address & offset: 0x%02x\n",
+			status);
+#endif
+		return status;
+	}
+
+
+	status = i2c_write_byte (data, len);	/* write the data */
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Data not written: 0x%02x\n", status);
+#endif
+		return status;
+	}
+	/* issue a stop bit */
+	i2c_stop ();
+	return 0;
+}
+
+/* 11-14-2002 Paul Marchese */
+/* function to determine if an I2C device is present */
+/* chip = device address of chip to check for */
+/* */
+/* returns 0 = sucessful, the device exists */
+/*         anything other than zero is failure, no device */
+int i2c_probe (uchar chip)
+{
+
+	/* We are just looking for an <ACK> back. */
+	/* To see if the device/chip is there */
+
+#ifdef DEBUG_I2C
+	unsigned int i2c_status;
+#endif
+	uchar status = 0;
+	unsigned int i2cFreq = CFG_I2C_SPEED;
+
+	DP (puts ("i2c_probe\n"));
+
+	i2c_init (i2cFreq, 0);	/* set the i2c frequency */
+
+	status = i2c_start ();	/* send a start bit */
+
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Transaction start failed: 0x%02x\n", status);
+#endif
+		return (int) status;
+	}
+
+	status = i2c_set_dev_offset (chip, 0, 0, 0);	/* send the slave address + no offset */
+	if (status) {
+#ifdef DEBUG_I2C
+		printf ("Failed to set slave address: 0x%02x\n", status);
+#endif
+		return (int) status;
+	}
+#ifdef DEBUG_I2C
+	GT_REG_READ (I2C_STATUS_BAUDE_RATE, &i2c_status);
+	printf ("address %#x returned %#x\n", chip, i2c_status);
+#endif
+	/* issue a stop bit */
+	i2c_stop ();
+	return 0;		/* successful completion */
+}