diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2018-09-25 14:02:31 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-09-25 14:14:07 +0100 |
| commit | 7bd9c60d4e0d113a8a4428bcbddc5aa9d41d1edc (patch) | |
| tree | 1a44d61fc5f12d7579a0ece7147b7606ca9170a4 /hw/i2c | |
| parent | 5540cb97f711d191bae6cde89a03a8a9c306b638 (diff) | |
aspeed/i2c: Handle receive command in separate function
Receive command handling may have to be deferred if a previous receive
done interrupt was not yet acknowledged. Move receive command handling
into a separate function to prepare for the necessary changes.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180914063506.20815-3-clg@kaod.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/i2c')
| -rw-r--r-- | hw/i2c/aspeed_i2c.c | 37 |
1 files changed, 21 insertions, 16 deletions
diff --git a/hw/i2c/aspeed_i2c.c b/hw/i2c/aspeed_i2c.c index 9a3a232fb8..ce16efc136 100644 --- a/hw/i2c/aspeed_i2c.c +++ b/hw/i2c/aspeed_i2c.c @@ -187,6 +187,26 @@ static uint8_t aspeed_i2c_get_state(AspeedI2CBus *bus) return (bus->cmd >> I2CD_TX_STATE_SHIFT) & I2CD_TX_STATE_MASK; } +static void aspeed_i2c_handle_rx_cmd(AspeedI2CBus *bus) +{ + int ret; + + aspeed_i2c_set_state(bus, I2CD_MRXD); + ret = i2c_recv(bus->bus); + if (ret < 0) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: read failed\n", __func__); + ret = 0xff; + } else { + bus->intr_status |= I2CD_INTR_RX_DONE; + } + bus->buf = (ret & I2CD_BYTE_BUF_RX_MASK) << I2CD_BYTE_BUF_RX_SHIFT; + if (bus->cmd & I2CD_M_S_RX_CMD_LAST) { + i2c_nack(bus->bus); + } + bus->cmd &= ~(I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST); + aspeed_i2c_set_state(bus, I2CD_MACTIVE); +} + /* * The state machine needs some refinement. It is only used to track * invalid STOP commands for the moment. @@ -233,22 +253,7 @@ static void aspeed_i2c_bus_handle_cmd(AspeedI2CBus *bus, uint64_t value) } if (bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST)) { - int ret; - - aspeed_i2c_set_state(bus, I2CD_MRXD); - ret = i2c_recv(bus->bus); - if (ret < 0) { - qemu_log_mask(LOG_GUEST_ERROR, "%s: read failed\n", __func__); - ret = 0xff; - } else { - bus->intr_status |= I2CD_INTR_RX_DONE; - } - bus->buf = (ret & I2CD_BYTE_BUF_RX_MASK) << I2CD_BYTE_BUF_RX_SHIFT; - if (bus->cmd & I2CD_M_S_RX_CMD_LAST) { - i2c_nack(bus->bus); - } - bus->cmd &= ~(I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST); - aspeed_i2c_set_state(bus, I2CD_MACTIVE); + aspeed_i2c_handle_rx_cmd(bus); } if (bus->cmd & I2CD_M_STOP_CMD) { |