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A1-board-selector-CCR.c
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A1-board-selector-CCR.c
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/*
* board selector support for TCA9535 used in Bitmine's CoinCraft Desk
*
* Copyright 2014 Zefir Kurtisi <[email protected]>
*
* 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 3 of the License, or (at your option)
* any later version. See COPYING for more details.
*/
#include "miner.h"
#include "A1-board-selector.h"
#include "i2c-context.h"
static struct board_selector ccr_selector;
static struct i2c_ctx *U1_tca9548;
static struct i2c_ctx *U3_tca9535;
static struct i2c_ctx *U4_tca9535;
static uint8_t active_chain;
static pthread_mutex_t lock;
struct chain_mapping {
uint8_t chain_id;
uint8_t U1;
uint8_t U3p0;
uint8_t U3p1;
};
static const struct chain_mapping chain_mapping[CCR_MAX_CHAINS] = {
{ 0, 0x01, 0x01, 0x00, },
{ 1, 0x01, 0x00, 0x80, },
{ 2, 0x02, 0x02, 0x00, },
{ 3, 0x02, 0x00, 0x40, },
{ 4, 0x04, 0x04, 0x00, },
{ 5, 0x04, 0x00, 0x20, },
{ 6, 0x08, 0x08, 0x00, },
{ 7, 0x08, 0x00, 0x10, },
{ 8, 0x10, 0x10, 0x00, },
{ 9, 0x10, 0x00, 0x08, },
{ 10, 0x20, 0x20, 0x00, },
{ 11, 0x20, 0x00, 0x04, },
{ 12, 0x40, 0x40, 0x00, },
{ 13, 0x40, 0x00, 0x02, },
{ 14, 0x80, 0x80, 0x00, },
{ 15, 0x80, 0x00, 0x01, },
};
static void ccr_unlock(void)
{
mutex_unlock(&lock);
}
static void ccr_exit(void)
{
if (U1_tca9548 != NULL)
U1_tca9548->exit(U1_tca9548);
if (U3_tca9535 != NULL)
U3_tca9535->exit(U3_tca9535);
if (U4_tca9535 != NULL)
U4_tca9535->exit(U4_tca9535);
}
extern struct board_selector *ccr_board_selector_init(void)
{
mutex_init(&lock);
applog(LOG_INFO, "ccr_board_selector_init()");
/* detect all i2c slaves */
U1_tca9548 = i2c_slave_open(I2C_BUS, 0x70);
U3_tca9535 = i2c_slave_open(I2C_BUS, 0x23);
U4_tca9535 = i2c_slave_open(I2C_BUS, 0x22);
if (U1_tca9548 == NULL || U3_tca9535 == NULL || U4_tca9535 == NULL)
goto fail;
/* init I2C multiplexer */
bool res = U1_tca9548->write(U1_tca9548, 0x00, 0x00) &&
/* init reset selector */
U3_tca9535->write(U3_tca9535, 0x06, 0x00) &&
U3_tca9535->write(U3_tca9535, 0x07, 0x00) &&
U3_tca9535->write(U3_tca9535, 0x02, 0x00) &&
U3_tca9535->write(U3_tca9535, 0x03, 0x00) &&
/* init chain selector */
U4_tca9535->write(U4_tca9535, 0x06, 0x00) &&
U4_tca9535->write(U4_tca9535, 0x07, 0x00) &&
U4_tca9535->write(U4_tca9535, 0x02, 0x00) &&
U4_tca9535->write(U4_tca9535, 0x03, 0x00);
if (!res)
goto fail;
return &ccr_selector;
fail:
ccr_exit();
return NULL;
}
static bool ccr_select(uint8_t chain)
{
if (chain >= CCR_MAX_CHAINS)
return false;
mutex_lock(&lock);
if (active_chain == chain)
return true;
active_chain = chain;
const struct chain_mapping *cm = &chain_mapping[chain];
if (!U1_tca9548->write(U1_tca9548, cm->U1, cm->U1))
return false;
if (!U4_tca9535->write(U4_tca9535, 0x02, cm->U3p0) ||
!U4_tca9535->write(U4_tca9535, 0x03, cm->U3p1))
return false;
/* sanity check: ensure i2c command has been written before we leave */
uint8_t tmp;
if (!U4_tca9535->read(U4_tca9535, 0x02, &tmp) || tmp != cm->U3p0) {
applog(LOG_ERR, "ccr_select: wrote 0x%02x, read 0x%02x",
cm->U3p0, tmp);
}
applog(LOG_DEBUG, "selected chain %d", chain);
return true;
}
static bool __ccr_board_selector_reset(uint8_t p0, uint8_t p1)
{
if (!U3_tca9535->write(U3_tca9535, 0x02, p0) ||
!U3_tca9535->write(U3_tca9535, 0x03, p1))
return false;
cgsleep_ms(RESET_LOW_TIME_MS);
if (!U3_tca9535->write(U3_tca9535, 0x02, 0x00) ||
!U3_tca9535->write(U3_tca9535, 0x03, 0x00))
return false;
cgsleep_ms(RESET_HI_TIME_MS);
return true;
}
// we assume we are already holding the mutex
static bool ccr_reset(void)
{
const struct chain_mapping *cm = &chain_mapping[active_chain];
applog(LOG_DEBUG, "resetting chain %d", cm->chain_id);
bool retval = __ccr_board_selector_reset(cm->U3p0, cm->U3p1);
return retval;
}
static bool ccr_reset_all(void)
{
mutex_lock(&lock);
bool retval = __ccr_board_selector_reset(0xff, 0xff);
mutex_unlock(&lock);
return retval;
}
static uint8_t ccr_get_temp(uint8_t sensor_id)
{
if ((active_chain & 1) != 0 || sensor_id != 0)
return 0;
struct i2c_ctx *U7 = i2c_slave_open(I2C_BUS, 0x4c);
if (U7 == NULL)
return 0;
uint8_t retval = 0;
if (!U7->read(U7, 0, &retval))
retval = 0;
U7->exit(U7);
return retval;
}
static struct board_selector ccr_selector = {
.select = ccr_select,
.release = ccr_unlock,
.exit = ccr_exit,
.reset = ccr_reset,
.reset_all = ccr_reset_all,
.get_temp = ccr_get_temp,
};