diff options
| -rw-r--r-- | drivers/soundwire/bus.c | 379 | ||||
| -rw-r--r-- | drivers/soundwire/bus.h | 2 | ||||
| -rw-r--r-- | include/linux/soundwire/sdw.h | 20 |
3 files changed, 401 insertions, 0 deletions
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index e306bd4438bd..4c345197eb55 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -616,3 +616,382 @@ static int sdw_initialize_slave(struct sdw_slave *slave) return 0; } + +static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status) +{ + u8 clear = 0, impl_int_mask; + int status, status2, ret, count = 0; + + status = sdw_read(slave, SDW_DP0_INT); + if (status < 0) { + dev_err(slave->bus->dev, + "SDW_DP0_INT read failed:%d", status); + return status; + } + + do { + + if (status & SDW_DP0_INT_TEST_FAIL) { + dev_err(&slave->dev, "Test fail for port 0"); + clear |= SDW_DP0_INT_TEST_FAIL; + } + + /* + * Assumption: PORT_READY interrupt will be received only for + * ports implementing Channel Prepare state machine (CP_SM) + */ + + if (status & SDW_DP0_INT_PORT_READY) { + complete(&slave->port_ready[0]); + clear |= SDW_DP0_INT_PORT_READY; + } + + if (status & SDW_DP0_INT_BRA_FAILURE) { + dev_err(&slave->dev, "BRA failed"); + clear |= SDW_DP0_INT_BRA_FAILURE; + } + + impl_int_mask = SDW_DP0_INT_IMPDEF1 | + SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3; + + if (status & impl_int_mask) { + clear |= impl_int_mask; + *slave_status = clear; + } + + /* clear the interrupt */ + ret = sdw_write(slave, SDW_DP0_INT, clear); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_DP0_INT write failed:%d", ret); + return ret; + } + + /* Read DP0 interrupt again */ + status2 = sdw_read(slave, SDW_DP0_INT); + if (status2 < 0) { + dev_err(slave->bus->dev, + "SDW_DP0_INT read failed:%d", status); + return status; + } + status &= status2; + + count++; + + /* we can get alerts while processing so keep retrying */ + } while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY); + + if (count == SDW_READ_INTR_CLEAR_RETRY) + dev_warn(slave->bus->dev, "Reached MAX_RETRY on DP0 read"); + + return ret; +} + +static int sdw_handle_port_interrupt(struct sdw_slave *slave, + int port, u8 *slave_status) +{ + u8 clear = 0, impl_int_mask; + int status, status2, ret, count = 0; + u32 addr; + + if (port == 0) + return sdw_handle_dp0_interrupt(slave, slave_status); + + addr = SDW_DPN_INT(port); + status = sdw_read(slave, addr); + if (status < 0) { + dev_err(slave->bus->dev, + "SDW_DPN_INT read failed:%d", status); + + return status; + } + + do { + + if (status & SDW_DPN_INT_TEST_FAIL) { + dev_err(&slave->dev, "Test fail for port:%d", port); + clear |= SDW_DPN_INT_TEST_FAIL; + } + + /* + * Assumption: PORT_READY interrupt will be received only + * for ports implementing CP_SM. + */ + if (status & SDW_DPN_INT_PORT_READY) { + complete(&slave->port_ready[port]); + clear |= SDW_DPN_INT_PORT_READY; + } + + impl_int_mask = SDW_DPN_INT_IMPDEF1 | + SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3; + + + if (status & impl_int_mask) { + clear |= impl_int_mask; + *slave_status = clear; + } + + /* clear the interrupt */ + ret = sdw_write(slave, addr, clear); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_DPN_INT write failed:%d", ret); + return ret; + } + + /* Read DPN interrupt again */ + status2 = sdw_read(slave, addr); + if (status < 0) { + dev_err(slave->bus->dev, + "SDW_DPN_INT read failed:%d", status); + return status; + } + status &= status2; + + count++; + + /* we can get alerts while processing so keep retrying */ + } while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY); + + if (count == SDW_READ_INTR_CLEAR_RETRY) + dev_warn(slave->bus->dev, "Reached MAX_RETRY on port read"); + + return ret; +} + +static int sdw_handle_slave_alerts(struct sdw_slave *slave) +{ + struct sdw_slave_intr_status slave_intr; + u8 clear = 0, bit, port_status[15]; + int port_num, stat, ret, count = 0; + unsigned long port; + bool slave_notify = false; + u8 buf, buf2[2], _buf, _buf2[2]; + + sdw_modify_slave_status(slave, SDW_SLAVE_ALERT); + + /* Read Instat 1, Instat 2 and Instat 3 registers */ + ret = buf = sdw_read(slave, SDW_SCP_INT1); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_SCP_INT1 read failed:%d", ret); + return ret; + } + + ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, buf2); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_SCP_INT2/3 read failed:%d", ret); + return ret; + } + + do { + /* + * Check parity, bus clash and Slave (impl defined) + * interrupt + */ + if (buf & SDW_SCP_INT1_PARITY) { + dev_err(&slave->dev, "Parity error detected"); + clear |= SDW_SCP_INT1_PARITY; + } + + if (buf & SDW_SCP_INT1_BUS_CLASH) { + dev_err(&slave->dev, "Bus clash error detected"); + clear |= SDW_SCP_INT1_BUS_CLASH; + } + + /* + * When bus clash or parity errors are detected, such errors + * are unlikely to be recoverable errors. + * TODO: In such scenario, reset bus. Make this configurable + * via sysfs property with bus reset being the default. + */ + + if (buf & SDW_SCP_INT1_IMPL_DEF) { + dev_dbg(&slave->dev, "Slave impl defined interrupt\n"); + clear |= SDW_SCP_INT1_IMPL_DEF; + slave_notify = true; + } + + /* Check port 0 - 3 interrupts */ + port = buf & SDW_SCP_INT1_PORT0_3; + + /* To get port number corresponding to bits, shift it */ + port = port >> SDW_REG_SHIFT(SDW_SCP_INT1_PORT0_3); + for_each_set_bit(bit, &port, 8) { + sdw_handle_port_interrupt(slave, bit, + &port_status[bit]); + + } + + /* Check if cascade 2 interrupt is present */ + if (buf & SDW_SCP_INT1_SCP2_CASCADE) { + port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10; + for_each_set_bit(bit, &port, 8) { + /* scp2 ports start from 4 */ + port_num = bit + 3; + sdw_handle_port_interrupt(slave, + port_num, + &port_status[port_num]); + } + } + + /* now check last cascade */ + if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) { + port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14; + for_each_set_bit(bit, &port, 8) { + /* scp3 ports start from 11 */ + port_num = bit + 10; + sdw_handle_port_interrupt(slave, + port_num, + &port_status[port_num]); + } + } + + /* Update the Slave driver */ + if (slave_notify && (slave->ops) && + (slave->ops->interrupt_callback)) { + slave_intr.control_port = clear; + memcpy(slave_intr.port, &port_status, + sizeof(slave_intr.port)); + + slave->ops->interrupt_callback(slave, &slave_intr); + } + + /* Ack interrupt */ + ret = sdw_write(slave, SDW_SCP_INT1, clear); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_SCP_INT1 write failed:%d", ret); + return ret; + } + + /* + * Read status again to ensure no new interrupts arrived + * while servicing interrupts. + */ + ret = _buf = sdw_read(slave, SDW_SCP_INT1); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_SCP_INT1 read failed:%d", ret); + return ret; + } + + ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, _buf2); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_SCP_INT2/3 read failed:%d", ret); + return ret; + } + + /* Make sure no interrupts are pending */ + buf &= _buf; + buf2[0] &= _buf2[0]; + buf2[1] &= _buf2[1]; + stat = buf || buf2[0] || buf2[1]; + + /* + * Exit loop if Slave is continuously in ALERT state even + * after servicing the interrupt multiple times. + */ + count++; + + /* we can get alerts while processing so keep retrying */ + } while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY); + + if (count == SDW_READ_INTR_CLEAR_RETRY) + dev_warn(slave->bus->dev, "Reached MAX_RETRY on alert read"); + + return ret; +} + +static int sdw_update_slave_status(struct sdw_slave *slave, + enum sdw_slave_status status) +{ + if ((slave->ops) && (slave->ops->update_status)) + return slave->ops->update_status(slave, status); + + return 0; +} + +/** + * sdw_handle_slave_status() - Handle Slave status + * @bus: SDW bus instance + * @status: Status for all Slave(s) + */ +int sdw_handle_slave_status(struct sdw_bus *bus, + enum sdw_slave_status status[]) +{ + enum sdw_slave_status prev_status; + struct sdw_slave *slave; + int i, ret = 0; + + if (status[0] == SDW_SLAVE_ATTACHED) { + ret = sdw_program_device_num(bus); + if (ret) + dev_err(bus->dev, "Slave attach failed: %d", ret); + } + + /* Continue to check other slave statuses */ + for (i = 1; i <= SDW_MAX_DEVICES; i++) { + mutex_lock(&bus->bus_lock); + if (test_bit(i, bus->assigned) == false) { + mutex_unlock(&bus->bus_lock); + continue; + } + mutex_unlock(&bus->bus_lock); + + slave = sdw_get_slave(bus, i); + if (!slave) + continue; + + switch (status[i]) { + case SDW_SLAVE_UNATTACHED: + if (slave->status == SDW_SLAVE_UNATTACHED) + break; + + sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED); + break; + + case SDW_SLAVE_ALERT: + ret = sdw_handle_slave_alerts(slave); + if (ret) + dev_err(bus->dev, + "Slave %d alert handling failed: %d", + i, ret); + break; + + case SDW_SLAVE_ATTACHED: + if (slave->status == SDW_SLAVE_ATTACHED) + break; + + prev_status = slave->status; + sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED); + + if (prev_status == SDW_SLAVE_ALERT) + break; + + ret = sdw_initialize_slave(slave); + if (ret) + dev_err(bus->dev, + "Slave %d initialization failed: %d", + i, ret); + + break; + + default: + dev_err(bus->dev, "Invalid slave %d status:%d", + i, status[i]); + break; + } + + ret = sdw_update_slave_status(slave, status[i]); + if (ret) + dev_err(slave->bus->dev, + "Update Slave status failed:%d", ret); + + } + + return ret; +} +EXPORT_SYMBOL(sdw_handle_slave_status); diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h index e8df55d761c7..345c34d697e9 100644 --- a/drivers/soundwire/bus.h +++ b/drivers/soundwire/bus.h @@ -49,6 +49,8 @@ int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg); int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg, struct sdw_defer *defer); +#define SDW_READ_INTR_CLEAR_RETRY 10 + int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf); diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index cbadddce470d..e91fdcf41049 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -331,11 +331,28 @@ struct sdw_slave_id { }; /** + * struct sdw_slave_intr_status - Slave interrupt status + * @control_port: control port status + * @port: data port status + */ +struct sdw_slave_intr_status { + u8 control_port; + u8 port[15]; +}; + +/** * struct sdw_slave_ops - Slave driver callback ops * @read_prop: Read Slave properties + * @interrupt_callback: Device interrupt notification (invoked in thread + * context) + * @update_status: Update Slave status */ struct sdw_slave_ops { int (*read_prop)(struct sdw_slave *sdw); + int (*interrupt_callback)(struct sdw_slave *slave, + struct sdw_slave_intr_status *status); + int (*update_status)(struct sdw_slave *slave, + enum sdw_slave_status status); }; /** @@ -382,6 +399,9 @@ struct sdw_driver { { .mfg_id = (_mfg_id), .part_id = (_part_id), \ .driver_data = (unsigned long)(_drv_data) } +int sdw_handle_slave_status(struct sdw_bus *bus, + enum sdw_slave_status status[]); + /* * SDW master structures and APIs */ |