diff options
Diffstat (limited to 'board/Marvell/common/i2c.c')
| -rw-r--r-- | board/Marvell/common/i2c.c | 521 |
1 files changed, 0 insertions, 521 deletions
diff --git a/board/Marvell/common/i2c.c b/board/Marvell/common/i2c.c deleted file mode 100644 index abdde868a7..0000000000 --- a/board/Marvell/common/i2c.c +++ /dev/null @@ -1,521 +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 - */ -#include <common.h> -#include <mpc8xx.h> -#include <malloc.h> -#include <i2c.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) */ - -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 = 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); - - 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 = 0; - 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 */ -} - -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_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; - } - - /* set the i2c frequency again */ - i2c_init (i2cFreq, CONFIG_SYS_I2C_SLAVE); - - 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 received: 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 */ -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_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 = CONFIG_SYS_I2C_SPEED; - - DP (puts ("i2c_probe\n")); - - /* set the i2c frequency */ - i2c_init (i2cFreq, CONFIG_SYS_I2C_SLAVE); - - 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 */ -} |
