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Diffstat (limited to 'board/esd/cpci750/i2c.c')
-rw-r--r--board/esd/cpci750/i2c.c475
1 files changed, 0 insertions, 475 deletions
diff --git a/board/esd/cpci750/i2c.c b/board/esd/cpci750/i2c.c
deleted file mode 100644
index bad0dac..0000000
--- a/board/esd/cpci750/i2c.c
+++ /dev/null
@@ -1,475 +0,0 @@
-/*
- * (C) Copyright 2000
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * SPDX-License-Identifier: GPL-2.0+
- *
- * 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 <i2c.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) */
-
-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 = CONFIG_SYS_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 */
-}
-
-int
-i2c_read (uchar dev_addr, unsigned int offset, int alen, uchar * data,
- int len)
-{
- uchar status = 0;
- unsigned int i2cFreq = CONFIG_SYS_I2C_SPEED;
-
- DP (puts ("i2c_read\n"));
-
- /* set the i2c frequency */
- i2c_init (i2cFreq, CONFIG_SYS_I2C_SLAVE);
-
- 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");
-}
-
-
-int
-i2c_write (uchar dev_addr, unsigned int offset, int alen, uchar * data,
- int len)
-{
- uchar status = 0;
- unsigned int i2cFreq = CONFIG_SYS_I2C_SPEED;
-
- DP (puts ("i2c_write\n"));
-
- /* set the i2c frequency */
- i2c_init (i2cFreq, CONFIG_SYS_I2C_SLAVE);
-
- 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 = CONFIG_SYS_I2C_SPEED;
-
- DP (puts ("i2c_probe\n"));
-
- /* set the i2c frequency */
- i2c_init (i2cFreq, CONFIG_SYS_I2C_SLAVE);
-
- 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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