From: Sanyog Kale <sanyog.r.k...@intel.com>
SoundWire Slaves report status to bus. Add helpers to handle
the status changes.
Signed-off-by: Hardik T Shah <hardik.t.s...@intel.com>
Signed-off-by: Sanyog Kale <sanyog.r.k...@intel.com>
Signed-off-by: Vinod Koul <vinod.k...@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
/**
--
2.7.4
