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soundwire: Add Slave status handling helpers
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> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sanyog Kale
Greg Kroah-Hartman
parent
9d715fa005
commit
d52d7a1be0
3 changed files with 230 additions and 0 deletions
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@ -374,6 +374,93 @@ int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
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}
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EXPORT_SYMBOL(sdw_write);
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/*
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* SDW alert handling
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*/
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/* called with bus_lock held */
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static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i)
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{
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struct sdw_slave *slave = NULL;
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list_for_each_entry(slave, &bus->slaves, node) {
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if (slave->dev_num == i)
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return slave;
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}
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return NULL;
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}
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static int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
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{
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if ((slave->id.unique_id != id.unique_id) ||
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(slave->id.mfg_id != id.mfg_id) ||
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(slave->id.part_id != id.part_id) ||
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(slave->id.class_id != id.class_id))
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return -ENODEV;
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return 0;
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}
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/* called with bus_lock held */
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static int sdw_get_device_num(struct sdw_slave *slave)
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{
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int bit;
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bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
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if (bit == SDW_MAX_DEVICES) {
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bit = -ENODEV;
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goto err;
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}
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/*
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* Do not update dev_num in Slave data structure here,
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* Update once program dev_num is successful
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*/
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set_bit(bit, slave->bus->assigned);
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err:
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return bit;
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}
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static int sdw_assign_device_num(struct sdw_slave *slave)
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{
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int ret, dev_num;
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/* check first if device number is assigned, if so reuse that */
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if (!slave->dev_num) {
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mutex_lock(&slave->bus->bus_lock);
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dev_num = sdw_get_device_num(slave);
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mutex_unlock(&slave->bus->bus_lock);
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if (dev_num < 0) {
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dev_err(slave->bus->dev, "Get dev_num failed: %d",
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dev_num);
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return dev_num;
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}
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} else {
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dev_info(slave->bus->dev,
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"Slave already registered dev_num:%d",
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slave->dev_num);
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/* Clear the slave->dev_num to transfer message on device 0 */
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dev_num = slave->dev_num;
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slave->dev_num = 0;
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}
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ret = sdw_write(slave, SDW_SCP_DEVNUMBER, dev_num);
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if (ret < 0) {
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dev_err(&slave->dev, "Program device_num failed: %d", ret);
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return ret;
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}
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/* After xfer of msg, restore dev_num */
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slave->dev_num = dev_num;
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return 0;
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}
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void sdw_extract_slave_id(struct sdw_bus *bus,
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u64 addr, struct sdw_slave_id *id)
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{
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@ -402,3 +489,130 @@ void sdw_extract_slave_id(struct sdw_bus *bus,
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id->unique_id, id->sdw_version);
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}
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static int sdw_program_device_num(struct sdw_bus *bus)
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{
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u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
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struct sdw_slave *slave, *_s;
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struct sdw_slave_id id;
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struct sdw_msg msg;
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bool found = false;
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int count = 0, ret;
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u64 addr;
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/* No Slave, so use raw xfer api */
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ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
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SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
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if (ret < 0)
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return ret;
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do {
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ret = sdw_transfer(bus, &msg);
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if (ret == -ENODATA) { /* end of device id reads */
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ret = 0;
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break;
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}
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if (ret < 0) {
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dev_err(bus->dev, "DEVID read fail:%d\n", ret);
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break;
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}
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/*
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* Construct the addr and extract. Cast the higher shift
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* bits to avoid truncation due to size limit.
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*/
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addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) |
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(buf[2] << 24) | ((unsigned long long)buf[1] << 32) |
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((unsigned long long)buf[0] << 40);
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sdw_extract_slave_id(bus, addr, &id);
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/* Now compare with entries */
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list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
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if (sdw_compare_devid(slave, id) == 0) {
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found = true;
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/*
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* Assign a new dev_num to this Slave and
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* not mark it present. It will be marked
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* present after it reports ATTACHED on new
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* dev_num
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*/
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ret = sdw_assign_device_num(slave);
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if (ret) {
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dev_err(slave->bus->dev,
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"Assign dev_num failed:%d",
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ret);
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return ret;
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}
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break;
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}
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}
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if (found == false) {
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/* TODO: Park this device in Group 13 */
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dev_err(bus->dev, "Slave Entry not found");
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}
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count++;
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/*
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* Check till error out or retry (count) exhausts.
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* Device can drop off and rejoin during enumeration
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* so count till twice the bound.
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*/
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} while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
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return ret;
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}
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static void sdw_modify_slave_status(struct sdw_slave *slave,
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enum sdw_slave_status status)
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{
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mutex_lock(&slave->bus->bus_lock);
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slave->status = status;
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mutex_unlock(&slave->bus->bus_lock);
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}
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static int sdw_initialize_slave(struct sdw_slave *slave)
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{
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struct sdw_slave_prop *prop = &slave->prop;
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int ret;
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u8 val;
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/*
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* Set bus clash, parity and SCP implementation
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* defined interrupt mask
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* TODO: Read implementation defined interrupt mask
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* from Slave property
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*/
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val = SDW_SCP_INT1_IMPL_DEF | SDW_SCP_INT1_BUS_CLASH |
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SDW_SCP_INT1_PARITY;
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/* Enable SCP interrupts */
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ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_SCP_INTMASK1 write failed:%d", ret);
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return ret;
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}
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/* No need to continue if DP0 is not present */
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if (!slave->prop.dp0_prop)
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return 0;
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/* Enable DP0 interrupts */
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val = prop->dp0_prop->device_interrupts;
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val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
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ret = sdw_update(slave, SDW_DP0_INTMASK, val, val);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_DP0_INTMASK read failed:%d", ret);
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return val;
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}
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return 0;
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}
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@ -52,4 +52,18 @@ int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
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int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
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u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf);
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/* Read-Modify-Write Slave register */
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static inline int
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sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
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{
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int tmp;
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tmp = sdw_read(slave, addr);
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if (tmp < 0)
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return tmp;
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tmp = (tmp & ~mask) | val;
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return sdw_write(slave, addr, tmp);
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}
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#endif /* __SDW_BUS_H */
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@ -22,6 +22,8 @@ struct sdw_slave;
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/* SDW Master Device Number, not supported yet */
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#define SDW_MASTER_DEV_NUM 14
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#define SDW_NUM_DEV_ID_REGISTERS 6
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#define SDW_MAX_DEVICES 11
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/**
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