From: Sanyog Kale sanyog.r.kale@intel.com
SoundWire Slaves report status to bus. Add helpers to handle the status changes.
Signed-off-by: Hardik T Shah hardik.t.shah@intel.com Signed-off-by: Sanyog Kale sanyog.r.kale@intel.com Signed-off-by: Vinod Koul vinod.koul@intel.com --- drivers/soundwire/bus.c | 211 ++++++++++++++++++++++++++++++++++++++++++ include/linux/soundwire/sdw.h | 1 + 2 files changed, 212 insertions(+)
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 9ac22eab11bb..f206e78d4b68 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -393,6 +393,95 @@ int sdw_write(struct sdw_slave *slave, u32 addr, u8 value) } EXPORT_SYMBOL(sdw_write);
+/* + * SDW alert handling + */ +static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i) +{ + struct sdw_slave *slave; + + list_for_each_entry(slave, &bus->slaves, node) { + if (slave->dev_num == i) + return slave; + } + + return NULL; +} + +static int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id) +{ + + if ((slave->id.unique_id != id.unique_id) || + (slave->id.mfg_id != id.mfg_id) || + (slave->id.part_id != id.part_id) || + (slave->id.class_id != id.class_id)) + return -ENODEV; + + return 0; +} + +static int sdw_get_device_num(struct sdw_slave *slave) +{ + bool assigned = false; + int i; + + mutex_lock(&slave->bus->bus_lock); + for (i = 1; i <= SDW_MAX_DEVICES; i++) { + if (slave->bus->assigned[i] == true) + continue; + + slave->bus->assigned[i] = true; + assigned = true; + + /* + * Do not update dev_num in Slave data structure here, + * Update once program dev_num is successful + */ + break; + } + + mutex_unlock(&slave->bus->bus_lock); + if (assigned) + return i; + else + return -ENODEV; +} + +static int sdw_assign_device_num(struct sdw_slave *slave) +{ + int ret, dev_num; + + /* check first if device number is assigned, if so reuse that */ + if (!slave->dev_num) { + dev_num = sdw_get_device_num(slave); + if (dev_num < 0) { + dev_err(slave->bus->dev, "Get dev_num failed: %d", + dev_num); + return dev_num; + } + } else { + dev_info(slave->bus->dev, + "Slave already registered dev_num:%d", + slave->dev_num); + + /* Clear the slave->dev_num to transfer message on device 0 */ + dev_num = slave->dev_num; + slave->dev_num = 0; + + } + + ret = sdw_write(slave, SDW_SCP_DEVNUMBER, dev_num); + if (ret < 0) { + dev_err(&slave->dev, "Program device_num failed: %d", ret); + return ret; + } + + /* After xfer of msg, restore dev_num */ + slave->dev_num = dev_num; + + return 0; +} + void sdw_extract_slave_id(struct sdw_bus *bus, unsigned long long addr, struct sdw_slave_id *id) { @@ -421,3 +510,125 @@ void sdw_extract_slave_id(struct sdw_bus *bus, id->unique_id, id->sdw_version);
} + +static int sdw_program_device_num(struct sdw_bus *bus) +{ + u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0}; + unsigned long long addr; + struct sdw_slave *slave; + struct sdw_slave_id id; + struct sdw_msg msg; + bool found = false; + int ret; + + /* No Slave, so use raw xfer api */ + sdw_fill_msg(&msg, SDW_SCP_DEVID_0, SDW_NUM_DEV_ID_REGISTERS, + 0, SDW_MSG_FLAG_READ, buf); + + do { + ret = sdw_transfer(bus, NULL, &msg); + if (ret == -ENODATA) + break; + if (ret < 0) { + dev_err(bus->dev, "DEVID read fail:%d\n", ret); + break; + } + + /* + * Construct the addr and extract. Cast the higher shift + * bits to avoid truncation due to size limit. + */ + addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) | + (buf[2] << 24) | ((unsigned long long)buf[1] << 32) | + ((unsigned long long)buf[0] << 40); + + sdw_extract_slave_id(bus, addr, &id); + + /* Now compare with entries */ + list_for_each_entry(slave, &bus->slaves, node) { + if (sdw_compare_devid(slave, id) == 0) { + found = true; + + /* + * Assign a new dev_num to this Slave and + * not mark it present. It will be marked + * present after it reports ATTACHED on new + * dev_num + */ + ret = sdw_assign_device_num(slave); + if (ret) { + dev_err(slave->bus->dev, + "Assign dev_num failed:%d", + ret); + return ret; + } + + break; + } + } + + if (found == false) { + /* TODO: Park this device in Group 13 */ + dev_err(bus->dev, "Slave Entry not found"); + } + + } while (ret == 0); + + return 0; +} + +static void sdw_modify_slave_status(struct sdw_slave *slave, + enum sdw_slave_status status) +{ + mutex_lock(&slave->bus->bus_lock); + slave->status = status; + mutex_unlock(&slave->bus->bus_lock); +} + +static int sdw_initialize_slave(struct sdw_slave *slave) +{ + struct sdw_slave_prop *prop = &slave->prop; + int val, ret; + + val = sdw_read(slave, SDW_SCP_INTMASK1); + if (val < 0) { + dev_err(slave->bus->dev, + "SDW_SCP_INTMASK1 read failed:%d", val); + return val; + } + + /* Set bus clash and parity interrupt mask */ + val |= SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY; + + /* Enable SCP interrupts */ + ret = sdw_write(slave, SDW_SCP_INTMASK1, val); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_SCP_INTMASK1 write failed:%d", val); + return ret; + } + + /* No need to continue if DP0 is not present */ + if (!slave->prop.dp0_prop) + return 0; + + /* Enable DP0 interrupts */ + val = sdw_read(slave, SDW_DP0_INTMASK); + if (val < 0) { + dev_err(slave->bus->dev, + "SDW_DP0_INTMASK read failed:%d", val); + return val; + } + + val |= prop->dp0_prop->device_interrupts; + val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE; + + ret = sdw_write(slave, SDW_DP0_INTMASK, val); + if (ret < 0) { + dev_err(slave->bus->dev, + "SDW_DP0_INTMASK write failed:%d", val); + return ret; + } + + return 0; +} diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index af94c0a29024..c25315bc5331 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -65,6 +65,7 @@ struct sdw_slave; /* SDW Enumeration Device Number */ #define SDW_ENUM_DEV_NUM 0
+#define SDW_NUM_DEV_ID_REGISTERS 6 #define SDW_MAX_DEVICES 11
/**