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hw/misc/auxbus: Explode READ_I2C / WRITE_I2C_MOT cases 

To allow further simplifications in the following commits,
start copying WRITE_I2C code to the READ_I2C, and READ_I2C_MOT
to WRITE_I2C_MOT. No logical change.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Philippe Mathieu-Daudé 2021-06-17 13:53:27 +02:00 committed by Corey Minyard
parent eb8377386d
commit 80675e193c
1 changed files with 53 additions and 0 deletions
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53
hw/misc/auxbus.c
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@ -133,6 +133,26 @@ AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address,
* Classic I2C transactions..
*/
case READ_I2C:
is_write = cmd == READ_I2C ? false : true;
if (i2c_bus_busy(i2c_bus)) {
i2c_end_transfer(i2c_bus);
}
if (i2c_start_transfer(i2c_bus, address, !is_write)) {
ret = AUX_I2C_NACK;
break;
}
ret = AUX_I2C_ACK;
while (len > 0) {
if (i2c_send_recv(i2c_bus, data++, is_write) < 0) {
ret = AUX_I2C_NACK;
break;
}
len--;
}
i2c_end_transfer(i2c_bus);
break;
case WRITE_I2C:
is_write = cmd == READ_I2C ? false : true;
if (i2c_bus_busy(i2c_bus)) {
@ -163,6 +183,39 @@ AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address,
* - We changed the address.
*/
case WRITE_I2C_MOT:
is_write = cmd == READ_I2C_MOT ? false : true;
ret = AUX_I2C_NACK;
if (!i2c_bus_busy(i2c_bus)) {
/*
* No transactions started..
*/
if (i2c_start_transfer(i2c_bus, address, !is_write)) {
break;
}
} else if ((address != bus->last_i2c_address) ||
(bus->last_transaction != cmd)) {
/*
* Transaction started but we need to restart..
*/
i2c_end_transfer(i2c_bus);
if (i2c_start_transfer(i2c_bus, address, !is_write)) {
break;
}
}
bus->last_transaction = cmd;
bus->last_i2c_address = address;
while (len > 0) {
if (i2c_send_recv(i2c_bus, data++, is_write) < 0) {
i2c_end_transfer(i2c_bus);
break;
}
len--;
}
if (len == 0) {
ret = AUX_I2C_ACK;
}
break;
case READ_I2C_MOT:
is_write = cmd == READ_I2C_MOT ? false : true;
ret = AUX_I2C_NACK;