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Diffstat (limited to 'board/esd/cpci750/i2c.c')
-rw-r--r--board/esd/cpci750/i2c.c487
1 files changed, 487 insertions, 0 deletions
diff --git a/board/esd/cpci750/i2c.c b/board/esd/cpci750/i2c.c
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+++ b/board/esd/cpci750/i2c.c
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+/*
+ * (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
+ * for cpci750 by reinhard.arlt@esd-electronics.com
+ */
+#include <common.h>
+#include <mpc8xx.h>
+#include <malloc.h>
+#include "../../Marvell/include/mv_gen_reg.h"
+#include "../../Marvell/include/core.h"
+
+#define I2C_DELAY 100
+#undef 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 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);
+ asm(" sync");
+ GT_REG_WRITE (I2C_CONTROL, 0);
+ asm(" sync");
+
+ DP (puts ("set baudrate\n"));
+
+ GT_REG_WRITE (I2C_STATUS_BAUDE_RATE, (actualM << 3) | actualN);
+ asm(" sync");
+
+ DP (puts ("udelay...\n"));
+
+ udelay (I2C_DELAY);
+
+ GT_REG_WRITE (I2C_CONTROL, (0x1 << 2) | (0x1 << 6));
+ asm(" sync");
+}
+
+
+static uchar i2c_select_device (uchar dev_addr, uchar read, int ten_bit)
+{
+ unsigned int status, data, bits = 7;
+ unsigned int control;
+ int count = 0;
+
+ DP (puts ("i2c_select_device\n"));
+
+ /* Output slave address */
+
+ if (ten_bit) {
+ bits = 10;
+ }
+
+ GT_REG_READ (I2C_CONTROL, &control);
+ control |= (0x1 << 2);
+ GT_REG_WRITE (I2C_CONTROL, control);
+ asm(" sync");
+
+ GT_REG_READ (I2C_CONTROL, &control);
+ control |= (0x1 << 5); /* generate the I2C_START_BIT */
+ GT_REG_WRITE (I2C_CONTROL, control);
+ asm(" sync");
+ RESET_REG_BITS (I2C_CONTROL, (0x01 << 3));
+ asm(" sync");
+
+ GT_REG_READ (I2C_CONTROL, &status);
+ while ((status & 0x08) != 0x08) {
+ GT_REG_READ (I2C_CONTROL, &status);
+ }
+
+
+ count = 0;
+
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ while (((status & 0xff) != 0x08) && ((status & 0xff) != 0x10)){
+ if (count > 200) {
+#ifdef DEBUG_I2C
+ printf ("Failed to set startbit: 0x%02x\n", status);
+#endif
+ GT_REG_WRITE (I2C_CONTROL, (0x1 << 4)); /*stop */
+ asm(" sync");
+ return (status);
+ }
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ count++;
+ }
+
+ DP (puts ("i2c_select_device:write addr byte\n"));
+
+ /* assert the address */
+
+ data = (dev_addr << 1);
+ /* set the read bit */
+ data |= read;
+ GT_REG_WRITE (I2C_DATA, data);
+ asm(" sync");
+ RESET_REG_BITS (I2C_CONTROL, BIT3);
+ asm(" sync");
+
+ GT_REG_READ (I2C_CONTROL, &status);
+ while ((status & 0x08) != 0x08) {
+ GT_REG_READ (I2C_CONTROL, &status);
+ }
+
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ count = 0;
+ while (((status & 0xff) != 0x40) && ((status & 0xff) != 0x18)) {
+ if (count > 200) {
+#ifdef DEBUG_I2C
+ printf ("Failed to write address: 0x%02x\n", status);
+#endif
+ GT_REG_WRITE (I2C_CONTROL, (0x1 << 4)); /*stop */
+ return (status);
+ }
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ asm(" sync");
+ 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) {
+
+ RESET_REG_BITS (I2C_CONTROL, BIT3);
+ asm(" sync");
+
+ /* Get and return the data */
+
+ GT_REG_READ (I2C_CONTROL, &status);
+ while ((status & 0x08) != 0x08) {
+ GT_REG_READ (I2C_CONTROL, &status);
+ }
+
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ count++;
+ while ((status & 0xff) != 0x50) {
+ if (count > 20) {
+#ifdef DEBUG_I2C
+ printf ("Failed to get data len status: 0x%02x\n", status);
+#endif
+ GT_REG_WRITE (I2C_CONTROL, (0x1 << 4)); /*stop */
+ asm(" sync");
+ 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);
+ asm(" sync");
+ count = 0;
+
+ GT_REG_READ (I2C_CONTROL, &status);
+ while ((status & 0x08) != 0x08) {
+ GT_REG_READ (I2C_CONTROL, &status);
+ }
+
+ while ((status & 0xff) != 0x58) {
+ if (count > 2000) {
+ 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 */
+ asm(" sync");
+ RESET_REG_BITS (I2C_CONTROL, (0x1 << 3));
+ asm(" sync");
+
+ return (0);
+}
+
+
+static uchar i2c_write_data (unsigned int *data, int len)
+{
+ unsigned int status;
+ int count;
+ unsigned int temp;
+ unsigned int *temp_ptr = data;
+
+ DP (puts ("i2c_write_data\n"));
+
+ while (len) {
+ count = 0;
+ temp = (unsigned int) (*temp_ptr);
+ GT_REG_WRITE (I2C_DATA, temp);
+ asm(" sync");
+ RESET_REG_BITS (I2C_CONTROL, (0x1 << 3));
+ asm(" sync");
+
+ GT_REG_READ (I2C_CONTROL, &status);
+ while ((status & 0x08) != 0x08) {
+ GT_REG_READ (I2C_CONTROL, &status);
+ }
+
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ count++;
+ while ((status & 0xff) != 0x28) {
+ if (count > 200) {
+ GT_REG_WRITE (I2C_CONTROL, (0x1 << 4)); /*stop */
+ asm(" sync");
+ return (status);
+ }
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ count++;
+ }
+ len--;
+ temp_ptr++;
+ }
+ return (0);
+}
+
+
+static uchar i2c_write_byte (unsigned char *data, int len)
+{
+ unsigned int status;
+ int count;
+ unsigned int temp;
+ unsigned char *temp_ptr = data;
+
+ DP (puts ("i2c_write_byte\n"));
+
+ while (len) {
+ count = 0;
+ /* Set and assert the data */
+ temp = *temp_ptr;
+ GT_REG_WRITE (I2C_DATA, temp);
+ asm(" sync");
+ RESET_REG_BITS (I2C_CONTROL, (0x1 << 3));
+ asm(" sync");
+
+
+ GT_REG_READ (I2C_CONTROL, &status);
+ while ((status & 0x08) != 0x08) {
+ GT_REG_READ (I2C_CONTROL, &status);
+ }
+
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ count++;
+ while ((status & 0xff) != 0x28) {
+ if (count > 200) {
+ GT_REG_WRITE (I2C_CONTROL, (0x1 << 4)); /*stop */
+ asm(" sync");
+ return (status);
+ }
+ GT_REG_READ (I2C_STATUS_BAUDE_RATE, &status);
+ count++;
+ }
+ len--;
+ temp_ptr++;
+ }
+ 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];
+
+ table[1] = (offset ) & 0x0ff; /* low byte */
+ table[0] = (offset >> 8) & 0x0ff; /* high byte */
+
+ DP (puts ("i2c_set_dev_offset\n"));
+
+ status = i2c_select_device (dev_addr, 0, ten_bit);
+ if (status) {
+#ifdef DEBUG_I2C
+22 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_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_select_device (dev_addr, 1, 0);
+ if (status) {
+#ifdef DEBUG_I2C
+ printf ("Failed to select device for data read: 0x%02x\n",
+ status);
+#endif
+ return status;
+ }
+
+ status = i2c_get_data (data, len);
+ if (status) {
+#ifdef DEBUG_I2C
+ printf ("Data not read: 0x%02x\n", status);
+#endif
+ return status;
+ }
+
+ return 0;
+}
+
+
+void i2c_stop (void)
+{
+ GT_REG_WRITE (I2C_CONTROL, (0x1 << 4));
+ asm(" sync");
+}
+
+
+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_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;
+}
+
+
+int i2c_probe (uchar chip)
+{
+
+#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_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 */
+}
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