static void process_channel_reply(
struct i2c_engine *engine,
struct i2c_reply_transaction_data *reply)
{
uint32_t length = reply->length;
uint8_t *buffer = reply->data;
struct i2c_hw_engine_dce110 *hw_engine =
FROM_I2C_ENGINE(engine);
REG_SET_3(DC_I2C_DATA, 0,
DC_I2C_INDEX, hw_engine->buffer_used_write,
DC_I2C_DATA_RW, 1,
DC_I2C_INDEX_WRITE, 1);
while (length) {
/* after reading the status,
* if the I2C operation executed successfully
* (i.e. DC_I2C_STATUS_DONE = 1) then the I2C controller
* should read data bytes from I2C circular data buffer */
uint32_t i2c_data;
REG_GET(DC_I2C_DATA, DC_I2C_DATA, &i2c_data);
*buffer++ = i2c_data;
--length;
}
}
static enum i2c_channel_operation_result get_channel_status(
struct i2c_engine *i2c_engine,
uint8_t *returned_bytes)
{
uint32_t i2c_sw_status = 0;
struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine);
uint32_t value =
REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status);
if (i2c_sw_status == DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_SW)
return I2C_CHANNEL_OPERATION_ENGINE_BUSY;
else if (value & hw_engine->i2c_mask->DC_I2C_SW_STOPPED_ON_NACK)
return I2C_CHANNEL_OPERATION_NO_RESPONSE;
else if (value & hw_engine->i2c_mask->DC_I2C_SW_TIMEOUT)
return I2C_CHANNEL_OPERATION_TIMEOUT;
else if (value & hw_engine->i2c_mask->DC_I2C_SW_ABORTED)
return I2C_CHANNEL_OPERATION_FAILED;
else if (value & hw_engine->i2c_mask->DC_I2C_SW_DONE)
return I2C_CHANNEL_OPERATION_SUCCEEDED;
/*
* this is the case when HW used for communication, I2C_SW_STATUS
* could be zero
*/
return I2C_CHANNEL_OPERATION_SUCCEEDED;
}
static bool setup_engine(
struct i2c_engine *i2c_engine)
{
struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine);
/* Program pin select */
REG_UPDATE_6(
DC_I2C_CONTROL,
DC_I2C_GO, 0,
DC_I2C_SOFT_RESET, 0,
DC_I2C_SEND_RESET, 0,
DC_I2C_SW_STATUS_RESET, 1,
DC_I2C_TRANSACTION_COUNT, 0,
DC_I2C_DDC_SELECT, hw_engine->engine_id);
/* Program time limit */
REG_UPDATE_N(
SETUP, 2,
FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_TIME_LIMIT), I2C_SETUP_TIME_LIMIT,
FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_ENABLE), 1);
/* Program HW priority
* set to High - interrupt software I2C at any time
* Enable restart of SW I2C that was interrupted by HW
* disable queuing of software while I2C is in use by HW */
REG_UPDATE_2(
DC_I2C_ARBITRATION,
DC_I2C_NO_QUEUED_SW_GO, 0,
DC_I2C_SW_PRIORITY, DC_I2C_ARBITRATION__DC_I2C_SW_PRIORITY_NORMAL);
return true;
}
static void submit_channel_request(
struct i2c_engine *engine,
struct i2c_request_transaction_data *request)
{
request->status = I2C_CHANNEL_OPERATION_SUCCEEDED;
if (!process_transaction(FROM_I2C_ENGINE(engine), request))
return;
if (is_hw_busy(&engine->base)) {
request->status = I2C_CHANNEL_OPERATION_ENGINE_BUSY;
return;
}
execute_transaction(FROM_I2C_ENGINE(engine));
}
static void destroy(
struct i2c_engine **ptr)
{
dal_i2c_sw_engine_destruct(FROM_I2C_ENGINE(*ptr));
dm_free(*ptr);
*ptr = NULL;
}
static void destroy(
struct i2c_engine **engine)
{
struct i2c_sw_engine_dce110 *sw_engine = FROM_I2C_ENGINE(*engine);
destruct(sw_engine);
dm_free(sw_engine);
*engine = NULL;
}
static void destroy(
struct i2c_engine **i2c_engine)
{
struct i2c_hw_engine_dce110 *engine_dce110 =
FROM_I2C_ENGINE(*i2c_engine);
dal_i2c_hw_engine_destruct(&engine_dce110->base);
kfree(engine_dce110);
*i2c_engine = NULL;
}
static uint32_t get_speed(
const struct i2c_engine *i2c_engine)
{
const struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine);
uint32_t pre_scale = 0;
REG_GET(SPEED, DC_I2C_DDC1_PRESCALE, &pre_scale);
/* [anaumov] it seems following is unnecessary */
/*ASSERT(value.bits.DC_I2C_DDC1_PRESCALE);*/
return pre_scale ?
hw_engine->reference_frequency / pre_scale :
hw_engine->base.default_speed;
}
void dal_i2c_sw_engine_set_speed(
struct i2c_engine *engine,
uint32_t speed)
{
struct i2c_sw_engine *sw_engine = FROM_I2C_ENGINE(engine);
ASSERT(speed);
sw_engine->speed = speed ? speed : I2CAUX_DEFAULT_I2C_SW_SPEED;
sw_engine->clock_delay = 1000 / sw_engine->speed;
if (sw_engine->clock_delay < 12)
sw_engine->clock_delay = 12;
}
static void process_channel_reply(
struct i2c_engine *engine,
struct i2c_reply_transaction_data *reply)
{
uint8_t length = reply->length;
uint8_t *buffer = reply->data;
struct i2c_hw_engine_dce110 *i2c_hw_engine_dce110 =
FROM_I2C_ENGINE(engine);
uint32_t value = dal_read_reg(engine->base.ctx, mmDC_I2C_DATA);
/*set index*/
set_reg_field_value(
value,
i2c_hw_engine_dce110->buffer_used_write,
DC_I2C_DATA,
DC_I2C_INDEX);
set_reg_field_value(
value,
1,
DC_I2C_DATA,
DC_I2C_DATA_RW);
set_reg_field_value(
value,
1,
DC_I2C_DATA,
DC_I2C_INDEX_WRITE);
dal_write_reg(engine->base.ctx, mmDC_I2C_DATA, value);
while (length) {
/* after reading the status,
* if the I2C operation executed successfully
* (i.e. DC_I2C_STATUS_DONE = 1) then the I2C controller
* should read data bytes from I2C circular data buffer */
value = dal_read_reg(engine->base.ctx, mmDC_I2C_DATA);
*buffer++ = get_reg_field_value(
value,
DC_I2C_DATA,
DC_I2C_DATA);
--length;
}
}
void dal_i2c_sw_engine_submit_channel_request(
struct i2c_engine *engine,
struct i2c_request_transaction_data *req)
{
struct i2c_sw_engine *sw_engine = FROM_I2C_ENGINE(engine);
struct ddc *ddc = engine->base.ddc;
uint16_t clock_delay_div_4 = sw_engine->clock_delay >> 2;
/* send sync (start / repeated start) */
bool result = start_sync(engine->base.ctx, ddc, clock_delay_div_4);
/* process payload */
if (result) {
switch (req->action) {
case I2CAUX_TRANSACTION_ACTION_I2C_WRITE:
case I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT:
result = i2c_write(engine->base.ctx, ddc, clock_delay_div_4,
req->address, req->length, req->data);
break;
case I2CAUX_TRANSACTION_ACTION_I2C_READ:
case I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT:
result = i2c_read(engine->base.ctx, ddc, clock_delay_div_4,
req->address, req->length, req->data);
break;
default:
result = false;
break;
}
}
/* send stop if not 'mot' or operation failed */
if (!result ||
(req->action == I2CAUX_TRANSACTION_ACTION_I2C_WRITE) ||
(req->action == I2CAUX_TRANSACTION_ACTION_I2C_READ))
if (!stop_sync(engine->base.ctx, ddc, clock_delay_div_4))
result = false;
req->status = result ?
I2C_CHANNEL_OPERATION_SUCCEEDED :
I2C_CHANNEL_OPERATION_FAILED;
}
static void set_speed(
struct i2c_engine *i2c_engine,
uint32_t speed)
{
struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine);
if (speed) {
if (hw_engine->i2c_mask->DC_I2C_DDC1_START_STOP_TIMING_CNTL)
REG_UPDATE_N(
SPEED, 3,
FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), hw_engine->reference_frequency / speed,
FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_THRESHOLD), 2,
FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_START_STOP_TIMING_CNTL), speed > 50 ? 2:1);
else
REG_UPDATE_N(
SPEED, 2,
FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), hw_engine->reference_frequency / speed,
FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_THRESHOLD), 2);
}
}
static void set_speed(
struct i2c_engine *i2c_engine,
uint32_t speed)
{
struct i2c_hw_engine_dce110 *engine = FROM_I2C_ENGINE(i2c_engine);
if (speed) {
const uint32_t addr = engine->addr.DC_I2C_DDCX_SPEED;
uint32_t value = dal_read_reg(i2c_engine->base.ctx, addr);
set_reg_field_value(
value,
engine->reference_frequency / speed,
DC_I2C_DDC1_SPEED,
DC_I2C_DDC1_PRESCALE);
set_reg_field_value(
value,
2,
DC_I2C_DDC1_SPEED,
DC_I2C_DDC1_THRESHOLD);
/*DCE11, HW add 100Khz support for I2c*/
if (speed > 50) {
set_reg_field_value(
value,
2,
DC_I2C_DDC1_SPEED,
DC_I2C_DDC1_START_STOP_TIMING_CNTL);
} else {
set_reg_field_value(
value,
1,
DC_I2C_DDC1_SPEED,
DC_I2C_DDC1_START_STOP_TIMING_CNTL);
}
dal_write_reg(i2c_engine->base.ctx, addr, value);
}
}
static uint32_t get_speed(
const struct i2c_engine *i2c_engine)
{
const struct i2c_hw_engine_dce110 *engine = FROM_I2C_ENGINE(i2c_engine);
const uint32_t addr = engine->addr.DC_I2C_DDCX_SPEED;
uint32_t pre_scale = 0;
uint32_t value = dal_read_reg(i2c_engine->base.ctx, addr);
pre_scale = get_reg_field_value(
value,
DC_I2C_DDC1_SPEED,
DC_I2C_DDC1_PRESCALE);
/* [anaumov] it seems following is unnecessary */
/*ASSERT(value.bits.DC_I2C_DDC1_PRESCALE);*/
return pre_scale ?
engine->reference_frequency / pre_scale :
engine->base.default_speed;
}
uint32_t dal_i2c_sw_engine_get_speed(
const struct i2c_engine *engine)
{
return FROM_I2C_ENGINE(engine)->speed;
}
static bool setup_engine(
struct i2c_engine *i2c_engine)
{
uint32_t value = 0;
struct i2c_hw_engine_dce110 *engine = FROM_I2C_ENGINE(i2c_engine);
/* Program pin select */
{
const uint32_t addr = mmDC_I2C_CONTROL;
value = dal_read_reg(i2c_engine->base.ctx, addr);
set_reg_field_value(
value,
0,
DC_I2C_CONTROL,
DC_I2C_GO);
set_reg_field_value(
value,
0,
DC_I2C_CONTROL,
DC_I2C_SOFT_RESET);
set_reg_field_value(
value,
0,
DC_I2C_CONTROL,
DC_I2C_SEND_RESET);
set_reg_field_value(
value,
0,
DC_I2C_CONTROL,
DC_I2C_SW_STATUS_RESET);
set_reg_field_value(
value,
0,
DC_I2C_CONTROL,
DC_I2C_TRANSACTION_COUNT);
set_reg_field_value(
value,
engine->engine_id,
DC_I2C_CONTROL,
DC_I2C_DDC_SELECT);
dal_write_reg(i2c_engine->base.ctx, addr, value);
}
/* Program time limit */
{
const uint32_t addr = engine->addr.DC_I2C_DDCX_SETUP;
value = dal_read_reg(i2c_engine->base.ctx, addr);
set_reg_field_value(
value,
I2C_SETUP_TIME_LIMIT,
DC_I2C_DDC1_SETUP,
DC_I2C_DDC1_TIME_LIMIT);
set_reg_field_value(
value,
1,
DC_I2C_DDC1_SETUP,
DC_I2C_DDC1_ENABLE);
dal_write_reg(i2c_engine->base.ctx, addr, value);
}
/* Program HW priority
* set to High - interrupt software I2C at any time
* Enable restart of SW I2C that was interrupted by HW
* disable queuing of software while I2C is in use by HW */
{
value = dal_read_reg(i2c_engine->base.ctx,
mmDC_I2C_ARBITRATION);
set_reg_field_value(
value,
0,
DC_I2C_ARBITRATION,
DC_I2C_NO_QUEUED_SW_GO);
set_reg_field_value(
value,
DC_I2C_ARBITRATION__DC_I2C_SW_PRIORITY_NORMAL,
DC_I2C_ARBITRATION,
DC_I2C_SW_PRIORITY);
dal_write_reg(i2c_engine->base.ctx,
mmDC_I2C_ARBITRATION, value);
}
return true;
}