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- // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
- // Copyright(c) 2015-17 Intel Corporation.
- #include <linux/acpi.h>
- #include <linux/delay.h>
- #include <linux/mod_devicetable.h>
- #include <linux/pm_runtime.h>
- #include <linux/soundwire/sdw_registers.h>
- #include <linux/soundwire/sdw.h>
- #include <linux/soundwire/sdw_type.h>
- #include "bus.h"
- #include "sysfs_local.h"
- static DEFINE_IDA(sdw_bus_ida);
- static DEFINE_IDA(sdw_peripheral_ida);
- static int sdw_get_id(struct sdw_bus *bus)
- {
- int rc = ida_alloc(&sdw_bus_ida, GFP_KERNEL);
- if (rc < 0)
- return rc;
- bus->id = rc;
- return 0;
- }
- /**
- * sdw_bus_master_add() - add a bus Master instance
- * @bus: bus instance
- * @parent: parent device
- * @fwnode: firmware node handle
- *
- * Initializes the bus instance, read properties and create child
- * devices.
- */
- int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
- struct fwnode_handle *fwnode)
- {
- struct sdw_master_prop *prop = NULL;
- int ret;
- if (!parent) {
- pr_err("SoundWire parent device is not set\n");
- return -ENODEV;
- }
- ret = sdw_get_id(bus);
- if (ret < 0) {
- dev_err(parent, "Failed to get bus id\n");
- return ret;
- }
- ret = sdw_master_device_add(bus, parent, fwnode);
- if (ret < 0) {
- dev_err(parent, "Failed to add master device at link %d\n",
- bus->link_id);
- return ret;
- }
- if (!bus->ops) {
- dev_err(bus->dev, "SoundWire Bus ops are not set\n");
- return -EINVAL;
- }
- if (!bus->compute_params) {
- dev_err(bus->dev,
- "Bandwidth allocation not configured, compute_params no set\n");
- return -EINVAL;
- }
- mutex_init(&bus->msg_lock);
- mutex_init(&bus->bus_lock);
- INIT_LIST_HEAD(&bus->slaves);
- INIT_LIST_HEAD(&bus->m_rt_list);
- /*
- * Initialize multi_link flag
- */
- bus->multi_link = false;
- if (bus->ops->read_prop) {
- ret = bus->ops->read_prop(bus);
- if (ret < 0) {
- dev_err(bus->dev,
- "Bus read properties failed:%d\n", ret);
- return ret;
- }
- }
- sdw_bus_debugfs_init(bus);
- /*
- * Device numbers in SoundWire are 0 through 15. Enumeration device
- * number (0), Broadcast device number (15), Group numbers (12 and
- * 13) and Master device number (14) are not used for assignment so
- * mask these and other higher bits.
- */
- /* Set higher order bits */
- *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);
- /* Set enumuration device number and broadcast device number */
- set_bit(SDW_ENUM_DEV_NUM, bus->assigned);
- set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned);
- /* Set group device numbers and master device number */
- set_bit(SDW_GROUP12_DEV_NUM, bus->assigned);
- set_bit(SDW_GROUP13_DEV_NUM, bus->assigned);
- set_bit(SDW_MASTER_DEV_NUM, bus->assigned);
- /*
- * SDW is an enumerable bus, but devices can be powered off. So,
- * they won't be able to report as present.
- *
- * Create Slave devices based on Slaves described in
- * the respective firmware (ACPI/DT)
- */
- if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev))
- ret = sdw_acpi_find_slaves(bus);
- else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node)
- ret = sdw_of_find_slaves(bus);
- else
- ret = -ENOTSUPP; /* No ACPI/DT so error out */
- if (ret < 0) {
- dev_err(bus->dev, "Finding slaves failed:%d\n", ret);
- return ret;
- }
- /*
- * Initialize clock values based on Master properties. The max
- * frequency is read from max_clk_freq property. Current assumption
- * is that the bus will start at highest clock frequency when
- * powered on.
- *
- * Default active bank will be 0 as out of reset the Slaves have
- * to start with bank 0 (Table 40 of Spec)
- */
- prop = &bus->prop;
- bus->params.max_dr_freq = prop->max_clk_freq * SDW_DOUBLE_RATE_FACTOR;
- bus->params.curr_dr_freq = bus->params.max_dr_freq;
- bus->params.curr_bank = SDW_BANK0;
- bus->params.next_bank = SDW_BANK1;
- return 0;
- }
- EXPORT_SYMBOL(sdw_bus_master_add);
- static int sdw_delete_slave(struct device *dev, void *data)
- {
- struct sdw_slave *slave = dev_to_sdw_dev(dev);
- struct sdw_bus *bus = slave->bus;
- pm_runtime_disable(dev);
- sdw_slave_debugfs_exit(slave);
- mutex_lock(&bus->bus_lock);
- if (slave->dev_num) { /* clear dev_num if assigned */
- clear_bit(slave->dev_num, bus->assigned);
- if (bus->dev_num_ida_min)
- ida_free(&sdw_peripheral_ida, slave->dev_num);
- }
- list_del_init(&slave->node);
- mutex_unlock(&bus->bus_lock);
- device_unregister(dev);
- return 0;
- }
- /**
- * sdw_bus_master_delete() - delete the bus master instance
- * @bus: bus to be deleted
- *
- * Remove the instance, delete the child devices.
- */
- void sdw_bus_master_delete(struct sdw_bus *bus)
- {
- device_for_each_child(bus->dev, NULL, sdw_delete_slave);
- sdw_master_device_del(bus);
- sdw_bus_debugfs_exit(bus);
- ida_free(&sdw_bus_ida, bus->id);
- }
- EXPORT_SYMBOL(sdw_bus_master_delete);
- /*
- * SDW IO Calls
- */
- static inline int find_response_code(enum sdw_command_response resp)
- {
- switch (resp) {
- case SDW_CMD_OK:
- return 0;
- case SDW_CMD_IGNORED:
- return -ENODATA;
- case SDW_CMD_TIMEOUT:
- return -ETIMEDOUT;
- default:
- return -EIO;
- }
- }
- static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
- {
- int retry = bus->prop.err_threshold;
- enum sdw_command_response resp;
- int ret = 0, i;
- for (i = 0; i <= retry; i++) {
- resp = bus->ops->xfer_msg(bus, msg);
- ret = find_response_code(resp);
- /* if cmd is ok or ignored return */
- if (ret == 0 || ret == -ENODATA)
- return ret;
- }
- return ret;
- }
- static inline int do_transfer_defer(struct sdw_bus *bus,
- struct sdw_msg *msg,
- struct sdw_defer *defer)
- {
- int retry = bus->prop.err_threshold;
- enum sdw_command_response resp;
- int ret = 0, i;
- defer->msg = msg;
- defer->length = msg->len;
- init_completion(&defer->complete);
- for (i = 0; i <= retry; i++) {
- resp = bus->ops->xfer_msg_defer(bus, msg, defer);
- ret = find_response_code(resp);
- /* if cmd is ok or ignored return */
- if (ret == 0 || ret == -ENODATA)
- return ret;
- }
- return ret;
- }
- static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num)
- {
- int retry = bus->prop.err_threshold;
- enum sdw_command_response resp;
- int ret = 0, i;
- for (i = 0; i <= retry; i++) {
- resp = bus->ops->reset_page_addr(bus, dev_num);
- ret = find_response_code(resp);
- /* if cmd is ok or ignored return */
- if (ret == 0 || ret == -ENODATA)
- return ret;
- }
- return ret;
- }
- static int sdw_transfer_unlocked(struct sdw_bus *bus, struct sdw_msg *msg)
- {
- int ret;
- ret = do_transfer(bus, msg);
- if (ret != 0 && ret != -ENODATA)
- dev_err(bus->dev, "trf on Slave %d failed:%d %s addr %x count %d\n",
- msg->dev_num, ret,
- (msg->flags & SDW_MSG_FLAG_WRITE) ? "write" : "read",
- msg->addr, msg->len);
- if (msg->page)
- sdw_reset_page(bus, msg->dev_num);
- return ret;
- }
- /**
- * sdw_transfer() - Synchronous transfer message to a SDW Slave device
- * @bus: SDW bus
- * @msg: SDW message to be xfered
- */
- int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
- {
- int ret;
- mutex_lock(&bus->msg_lock);
- ret = sdw_transfer_unlocked(bus, msg);
- mutex_unlock(&bus->msg_lock);
- return ret;
- }
- /**
- * sdw_show_ping_status() - Direct report of PING status, to be used by Peripheral drivers
- * @bus: SDW bus
- * @sync_delay: Delay before reading status
- */
- void sdw_show_ping_status(struct sdw_bus *bus, bool sync_delay)
- {
- u32 status;
- if (!bus->ops->read_ping_status)
- return;
- /*
- * wait for peripheral to sync if desired. 10-15ms should be more than
- * enough in most cases.
- */
- if (sync_delay)
- usleep_range(10000, 15000);
- mutex_lock(&bus->msg_lock);
- status = bus->ops->read_ping_status(bus);
- mutex_unlock(&bus->msg_lock);
- if (!status)
- dev_warn(bus->dev, "%s: no peripherals attached\n", __func__);
- else
- dev_dbg(bus->dev, "PING status: %#x\n", status);
- }
- EXPORT_SYMBOL(sdw_show_ping_status);
- /**
- * sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device
- * @bus: SDW bus
- * @msg: SDW message to be xfered
- * @defer: Defer block for signal completion
- *
- * Caller needs to hold the msg_lock lock while calling this
- */
- int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
- struct sdw_defer *defer)
- {
- int ret;
- if (!bus->ops->xfer_msg_defer)
- return -ENOTSUPP;
- ret = do_transfer_defer(bus, msg, defer);
- if (ret != 0 && ret != -ENODATA)
- dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n",
- msg->dev_num, ret);
- if (msg->page)
- sdw_reset_page(bus, msg->dev_num);
- return ret;
- }
- int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
- u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf)
- {
- memset(msg, 0, sizeof(*msg));
- msg->addr = addr; /* addr is 16 bit and truncated here */
- msg->len = count;
- msg->dev_num = dev_num;
- msg->flags = flags;
- msg->buf = buf;
- if (addr < SDW_REG_NO_PAGE) /* no paging area */
- return 0;
- if (addr >= SDW_REG_MAX) { /* illegal addr */
- pr_err("SDW: Invalid address %x passed\n", addr);
- return -EINVAL;
- }
- if (addr < SDW_REG_OPTIONAL_PAGE) { /* 32k but no page */
- if (slave && !slave->prop.paging_support)
- return 0;
- /* no need for else as that will fall-through to paging */
- }
- /* paging mandatory */
- if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) {
- pr_err("SDW: Invalid device for paging :%d\n", dev_num);
- return -EINVAL;
- }
- if (!slave) {
- pr_err("SDW: No slave for paging addr\n");
- return -EINVAL;
- }
- if (!slave->prop.paging_support) {
- dev_err(&slave->dev,
- "address %x needs paging but no support\n", addr);
- return -EINVAL;
- }
- msg->addr_page1 = FIELD_GET(SDW_SCP_ADDRPAGE1_MASK, addr);
- msg->addr_page2 = FIELD_GET(SDW_SCP_ADDRPAGE2_MASK, addr);
- msg->addr |= BIT(15);
- msg->page = true;
- return 0;
- }
- /*
- * Read/Write IO functions.
- * no_pm versions can only be called by the bus, e.g. while enumerating or
- * handling suspend-resume sequences.
- * all clients need to use the pm versions
- */
- static int
- sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
- {
- struct sdw_msg msg;
- int ret;
- ret = sdw_fill_msg(&msg, slave, addr, count,
- slave->dev_num, SDW_MSG_FLAG_READ, val);
- if (ret < 0)
- return ret;
- ret = sdw_transfer(slave->bus, &msg);
- if (slave->is_mockup_device)
- ret = 0;
- return ret;
- }
- static int
- sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
- {
- struct sdw_msg msg;
- int ret;
- ret = sdw_fill_msg(&msg, slave, addr, count,
- slave->dev_num, SDW_MSG_FLAG_WRITE, (u8 *)val);
- if (ret < 0)
- return ret;
- ret = sdw_transfer(slave->bus, &msg);
- if (slave->is_mockup_device)
- ret = 0;
- return ret;
- }
- int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value)
- {
- return sdw_nwrite_no_pm(slave, addr, 1, &value);
- }
- EXPORT_SYMBOL(sdw_write_no_pm);
- static int
- sdw_bread_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr)
- {
- struct sdw_msg msg;
- u8 buf;
- int ret;
- ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
- SDW_MSG_FLAG_READ, &buf);
- if (ret < 0)
- return ret;
- ret = sdw_transfer(bus, &msg);
- if (ret < 0)
- return ret;
- return buf;
- }
- static int
- sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
- {
- struct sdw_msg msg;
- int ret;
- ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
- SDW_MSG_FLAG_WRITE, &value);
- if (ret < 0)
- return ret;
- return sdw_transfer(bus, &msg);
- }
- int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr)
- {
- struct sdw_msg msg;
- u8 buf;
- int ret;
- ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
- SDW_MSG_FLAG_READ, &buf);
- if (ret < 0)
- return ret;
- ret = sdw_transfer_unlocked(bus, &msg);
- if (ret < 0)
- return ret;
- return buf;
- }
- EXPORT_SYMBOL(sdw_bread_no_pm_unlocked);
- int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
- {
- struct sdw_msg msg;
- int ret;
- ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
- SDW_MSG_FLAG_WRITE, &value);
- if (ret < 0)
- return ret;
- return sdw_transfer_unlocked(bus, &msg);
- }
- EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked);
- int sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
- {
- u8 buf;
- int ret;
- ret = sdw_nread_no_pm(slave, addr, 1, &buf);
- if (ret < 0)
- return ret;
- else
- return buf;
- }
- EXPORT_SYMBOL(sdw_read_no_pm);
- int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
- {
- int tmp;
- tmp = sdw_read_no_pm(slave, addr);
- if (tmp < 0)
- return tmp;
- tmp = (tmp & ~mask) | val;
- return sdw_write_no_pm(slave, addr, tmp);
- }
- EXPORT_SYMBOL(sdw_update_no_pm);
- /* Read-Modify-Write Slave register */
- int sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
- {
- int tmp;
- tmp = sdw_read(slave, addr);
- if (tmp < 0)
- return tmp;
- tmp = (tmp & ~mask) | val;
- return sdw_write(slave, addr, tmp);
- }
- EXPORT_SYMBOL(sdw_update);
- /**
- * sdw_nread() - Read "n" contiguous SDW Slave registers
- * @slave: SDW Slave
- * @addr: Register address
- * @count: length
- * @val: Buffer for values to be read
- */
- int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
- {
- int ret;
- ret = pm_runtime_get_sync(&slave->dev);
- if (ret < 0 && ret != -EACCES) {
- pm_runtime_put_noidle(&slave->dev);
- return ret;
- }
- ret = sdw_nread_no_pm(slave, addr, count, val);
- pm_runtime_mark_last_busy(&slave->dev);
- pm_runtime_put(&slave->dev);
- return ret;
- }
- EXPORT_SYMBOL(sdw_nread);
- /**
- * sdw_nwrite() - Write "n" contiguous SDW Slave registers
- * @slave: SDW Slave
- * @addr: Register address
- * @count: length
- * @val: Buffer for values to be written
- */
- int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
- {
- int ret;
- ret = pm_runtime_get_sync(&slave->dev);
- if (ret < 0 && ret != -EACCES) {
- pm_runtime_put_noidle(&slave->dev);
- return ret;
- }
- ret = sdw_nwrite_no_pm(slave, addr, count, val);
- pm_runtime_mark_last_busy(&slave->dev);
- pm_runtime_put(&slave->dev);
- return ret;
- }
- EXPORT_SYMBOL(sdw_nwrite);
- /**
- * sdw_read() - Read a SDW Slave register
- * @slave: SDW Slave
- * @addr: Register address
- */
- int sdw_read(struct sdw_slave *slave, u32 addr)
- {
- u8 buf;
- int ret;
- ret = sdw_nread(slave, addr, 1, &buf);
- if (ret < 0)
- return ret;
- return buf;
- }
- EXPORT_SYMBOL(sdw_read);
- /**
- * sdw_write() - Write a SDW Slave register
- * @slave: SDW Slave
- * @addr: Register address
- * @value: Register value
- */
- int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
- {
- return sdw_nwrite(slave, addr, 1, &value);
- }
- EXPORT_SYMBOL(sdw_write);
- /*
- * SDW alert handling
- */
- /* called with bus_lock held */
- 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;
- }
- int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
- {
- if (slave->id.mfg_id != id.mfg_id ||
- slave->id.part_id != id.part_id ||
- slave->id.class_id != id.class_id ||
- (slave->id.unique_id != SDW_IGNORED_UNIQUE_ID &&
- slave->id.unique_id != id.unique_id))
- return -ENODEV;
- return 0;
- }
- EXPORT_SYMBOL(sdw_compare_devid);
- /* called with bus_lock held */
- static int sdw_get_device_num(struct sdw_slave *slave)
- {
- int bit;
- if (slave->bus->dev_num_ida_min) {
- bit = ida_alloc_range(&sdw_peripheral_ida,
- slave->bus->dev_num_ida_min, SDW_MAX_DEVICES,
- GFP_KERNEL);
- if (bit < 0)
- goto err;
- } else {
- bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
- if (bit == SDW_MAX_DEVICES) {
- bit = -ENODEV;
- goto err;
- }
- }
- /*
- * Do not update dev_num in Slave data structure here,
- * Update once program dev_num is successful
- */
- set_bit(bit, slave->bus->assigned);
- err:
- return bit;
- }
- static int sdw_assign_device_num(struct sdw_slave *slave)
- {
- struct sdw_bus *bus = slave->bus;
- int ret, dev_num;
- bool new_device = false;
- /* check first if device number is assigned, if so reuse that */
- if (!slave->dev_num) {
- if (!slave->dev_num_sticky) {
- mutex_lock(&slave->bus->bus_lock);
- dev_num = sdw_get_device_num(slave);
- mutex_unlock(&slave->bus->bus_lock);
- if (dev_num < 0) {
- dev_err(bus->dev, "Get dev_num failed: %d\n",
- dev_num);
- return dev_num;
- }
- slave->dev_num = dev_num;
- slave->dev_num_sticky = dev_num;
- new_device = true;
- } else {
- slave->dev_num = slave->dev_num_sticky;
- }
- }
- if (!new_device)
- dev_dbg(bus->dev,
- "Slave already registered, reusing dev_num:%d\n",
- 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_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num);
- if (ret < 0) {
- dev_err(bus->dev, "Program device_num %d failed: %d\n",
- dev_num, ret);
- return ret;
- }
- /* After xfer of msg, restore dev_num */
- slave->dev_num = slave->dev_num_sticky;
- return 0;
- }
- void sdw_extract_slave_id(struct sdw_bus *bus,
- u64 addr, struct sdw_slave_id *id)
- {
- dev_dbg(bus->dev, "SDW Slave Addr: %llx\n", addr);
- id->sdw_version = SDW_VERSION(addr);
- id->unique_id = SDW_UNIQUE_ID(addr);
- id->mfg_id = SDW_MFG_ID(addr);
- id->part_id = SDW_PART_ID(addr);
- id->class_id = SDW_CLASS_ID(addr);
- dev_dbg(bus->dev,
- "SDW Slave class_id 0x%02x, mfg_id 0x%04x, part_id 0x%04x, unique_id 0x%x, version 0x%x\n",
- id->class_id, id->mfg_id, id->part_id, id->unique_id, id->sdw_version);
- }
- EXPORT_SYMBOL(sdw_extract_slave_id);
- static int sdw_program_device_num(struct sdw_bus *bus, bool *programmed)
- {
- u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
- struct sdw_slave *slave, *_s;
- struct sdw_slave_id id;
- struct sdw_msg msg;
- bool found;
- int count = 0, ret;
- u64 addr;
- *programmed = false;
- /* No Slave, so use raw xfer api */
- ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
- SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
- if (ret < 0)
- return ret;
- do {
- ret = sdw_transfer(bus, &msg);
- if (ret == -ENODATA) { /* end of device id reads */
- dev_dbg(bus->dev, "No more devices to enumerate\n");
- ret = 0;
- 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) |
- ((u64)buf[2] << 24) | ((u64)buf[1] << 32) |
- ((u64)buf[0] << 40);
- sdw_extract_slave_id(bus, addr, &id);
- found = false;
- /* Now compare with entries */
- list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
- if (sdw_compare_devid(slave, id) == 0) {
- found = true;
- /*
- * To prevent skipping state-machine stages don't
- * program a device until we've seen it UNATTACH.
- * Must return here because no other device on #0
- * can be detected until this one has been
- * assigned a device ID.
- */
- if (slave->status != SDW_SLAVE_UNATTACHED)
- return 0;
- /*
- * 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 < 0) {
- dev_err(bus->dev,
- "Assign dev_num failed:%d\n",
- ret);
- return ret;
- }
- *programmed = true;
- break;
- }
- }
- if (!found) {
- /* TODO: Park this device in Group 13 */
- /*
- * add Slave device even if there is no platform
- * firmware description. There will be no driver probe
- * but the user/integration will be able to see the
- * device, enumeration status and device number in sysfs
- */
- sdw_slave_add(bus, &id, NULL);
- dev_err(bus->dev, "Slave Entry not found\n");
- }
- count++;
- /*
- * Check till error out or retry (count) exhausts.
- * Device can drop off and rejoin during enumeration
- * so count till twice the bound.
- */
- } while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
- return ret;
- }
- static void sdw_modify_slave_status(struct sdw_slave *slave,
- enum sdw_slave_status status)
- {
- struct sdw_bus *bus = slave->bus;
- mutex_lock(&bus->bus_lock);
- dev_vdbg(bus->dev,
- "changing status slave %d status %d new status %d\n",
- slave->dev_num, slave->status, status);
- if (status == SDW_SLAVE_UNATTACHED) {
- dev_dbg(&slave->dev,
- "initializing enumeration and init completion for Slave %d\n",
- slave->dev_num);
- reinit_completion(&slave->enumeration_complete);
- reinit_completion(&slave->initialization_complete);
- } else if ((status == SDW_SLAVE_ATTACHED) &&
- (slave->status == SDW_SLAVE_UNATTACHED)) {
- dev_dbg(&slave->dev,
- "signaling enumeration completion for Slave %d\n",
- slave->dev_num);
- complete_all(&slave->enumeration_complete);
- }
- slave->status = status;
- mutex_unlock(&bus->bus_lock);
- }
- static int sdw_slave_clk_stop_callback(struct sdw_slave *slave,
- enum sdw_clk_stop_mode mode,
- enum sdw_clk_stop_type type)
- {
- int ret = 0;
- mutex_lock(&slave->sdw_dev_lock);
- if (slave->probed) {
- struct device *dev = &slave->dev;
- struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
- if (drv->ops && drv->ops->clk_stop)
- ret = drv->ops->clk_stop(slave, mode, type);
- }
- mutex_unlock(&slave->sdw_dev_lock);
- return ret;
- }
- static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave,
- enum sdw_clk_stop_mode mode,
- bool prepare)
- {
- bool wake_en;
- u32 val = 0;
- int ret;
- wake_en = slave->prop.wake_capable;
- if (prepare) {
- val = SDW_SCP_SYSTEMCTRL_CLK_STP_PREP;
- if (mode == SDW_CLK_STOP_MODE1)
- val |= SDW_SCP_SYSTEMCTRL_CLK_STP_MODE1;
- if (wake_en)
- val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN;
- } else {
- ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
- if (ret < 0) {
- if (ret != -ENODATA)
- dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
- return ret;
- }
- val = ret;
- val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP);
- }
- ret = sdw_write_no_pm(slave, SDW_SCP_SYSTEMCTRL, val);
- if (ret < 0 && ret != -ENODATA)
- dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL write failed:%d\n", ret);
- return ret;
- }
- static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
- {
- int retry = bus->clk_stop_timeout;
- int val;
- do {
- val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT);
- if (val < 0) {
- if (val != -ENODATA)
- dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
- return val;
- }
- val &= SDW_SCP_STAT_CLK_STP_NF;
- if (!val) {
- dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d\n",
- dev_num);
- return 0;
- }
- usleep_range(1000, 1500);
- retry--;
- } while (retry);
- dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d\n",
- dev_num);
- return -ETIMEDOUT;
- }
- /**
- * sdw_bus_prep_clk_stop: prepare Slave(s) for clock stop
- *
- * @bus: SDW bus instance
- *
- * Query Slave for clock stop mode and prepare for that mode.
- */
- int sdw_bus_prep_clk_stop(struct sdw_bus *bus)
- {
- bool simple_clk_stop = true;
- struct sdw_slave *slave;
- bool is_slave = false;
- int ret = 0;
- /*
- * In order to save on transition time, prepare
- * each Slave and then wait for all Slave(s) to be
- * prepared for clock stop.
- * If one of the Slave devices has lost sync and
- * replies with Command Ignored/-ENODATA, we continue
- * the loop
- */
- list_for_each_entry(slave, &bus->slaves, node) {
- if (!slave->dev_num)
- continue;
- if (slave->status != SDW_SLAVE_ATTACHED &&
- slave->status != SDW_SLAVE_ALERT)
- continue;
- /* Identify if Slave(s) are available on Bus */
- is_slave = true;
- ret = sdw_slave_clk_stop_callback(slave,
- SDW_CLK_STOP_MODE0,
- SDW_CLK_PRE_PREPARE);
- if (ret < 0 && ret != -ENODATA) {
- dev_err(&slave->dev, "clock stop pre-prepare cb failed:%d\n", ret);
- return ret;
- }
- /* Only prepare a Slave device if needed */
- if (!slave->prop.simple_clk_stop_capable) {
- simple_clk_stop = false;
- ret = sdw_slave_clk_stop_prepare(slave,
- SDW_CLK_STOP_MODE0,
- true);
- if (ret < 0 && ret != -ENODATA) {
- dev_err(&slave->dev, "clock stop prepare failed:%d\n", ret);
- return ret;
- }
- }
- }
- /* Skip remaining clock stop preparation if no Slave is attached */
- if (!is_slave)
- return 0;
- /*
- * Don't wait for all Slaves to be ready if they follow the simple
- * state machine
- */
- if (!simple_clk_stop) {
- ret = sdw_bus_wait_for_clk_prep_deprep(bus,
- SDW_BROADCAST_DEV_NUM);
- /*
- * if there are no Slave devices present and the reply is
- * Command_Ignored/-ENODATA, we don't need to continue with the
- * flow and can just return here. The error code is not modified
- * and its handling left as an exercise for the caller.
- */
- if (ret < 0)
- return ret;
- }
- /* Inform slaves that prep is done */
- list_for_each_entry(slave, &bus->slaves, node) {
- if (!slave->dev_num)
- continue;
- if (slave->status != SDW_SLAVE_ATTACHED &&
- slave->status != SDW_SLAVE_ALERT)
- continue;
- ret = sdw_slave_clk_stop_callback(slave,
- SDW_CLK_STOP_MODE0,
- SDW_CLK_POST_PREPARE);
- if (ret < 0 && ret != -ENODATA) {
- dev_err(&slave->dev, "clock stop post-prepare cb failed:%d\n", ret);
- return ret;
- }
- }
- return 0;
- }
- EXPORT_SYMBOL(sdw_bus_prep_clk_stop);
- /**
- * sdw_bus_clk_stop: stop bus clock
- *
- * @bus: SDW bus instance
- *
- * After preparing the Slaves for clock stop, stop the clock by broadcasting
- * write to SCP_CTRL register.
- */
- int sdw_bus_clk_stop(struct sdw_bus *bus)
- {
- int ret;
- /*
- * broadcast clock stop now, attached Slaves will ACK this,
- * unattached will ignore
- */
- ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM,
- SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW);
- if (ret < 0) {
- if (ret != -ENODATA)
- dev_err(bus->dev, "ClockStopNow Broadcast msg failed %d\n", ret);
- return ret;
- }
- return 0;
- }
- EXPORT_SYMBOL(sdw_bus_clk_stop);
- /**
- * sdw_bus_exit_clk_stop: Exit clock stop mode
- *
- * @bus: SDW bus instance
- *
- * This De-prepares the Slaves by exiting Clock Stop Mode 0. For the Slaves
- * exiting Clock Stop Mode 1, they will be de-prepared after they enumerate
- * back.
- */
- int sdw_bus_exit_clk_stop(struct sdw_bus *bus)
- {
- bool simple_clk_stop = true;
- struct sdw_slave *slave;
- bool is_slave = false;
- int ret;
- /*
- * In order to save on transition time, de-prepare
- * each Slave and then wait for all Slave(s) to be
- * de-prepared after clock resume.
- */
- list_for_each_entry(slave, &bus->slaves, node) {
- if (!slave->dev_num)
- continue;
- if (slave->status != SDW_SLAVE_ATTACHED &&
- slave->status != SDW_SLAVE_ALERT)
- continue;
- /* Identify if Slave(s) are available on Bus */
- is_slave = true;
- ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
- SDW_CLK_PRE_DEPREPARE);
- if (ret < 0)
- dev_warn(&slave->dev, "clock stop pre-deprepare cb failed:%d\n", ret);
- /* Only de-prepare a Slave device if needed */
- if (!slave->prop.simple_clk_stop_capable) {
- simple_clk_stop = false;
- ret = sdw_slave_clk_stop_prepare(slave, SDW_CLK_STOP_MODE0,
- false);
- if (ret < 0)
- dev_warn(&slave->dev, "clock stop deprepare failed:%d\n", ret);
- }
- }
- /* Skip remaining clock stop de-preparation if no Slave is attached */
- if (!is_slave)
- return 0;
- /*
- * Don't wait for all Slaves to be ready if they follow the simple
- * state machine
- */
- if (!simple_clk_stop) {
- ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);
- if (ret < 0)
- dev_warn(bus->dev, "clock stop deprepare wait failed:%d\n", ret);
- }
- list_for_each_entry(slave, &bus->slaves, node) {
- if (!slave->dev_num)
- continue;
- if (slave->status != SDW_SLAVE_ATTACHED &&
- slave->status != SDW_SLAVE_ALERT)
- continue;
- ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
- SDW_CLK_POST_DEPREPARE);
- if (ret < 0)
- dev_warn(&slave->dev, "clock stop post-deprepare cb failed:%d\n", ret);
- }
- return 0;
- }
- EXPORT_SYMBOL(sdw_bus_exit_clk_stop);
- int sdw_configure_dpn_intr(struct sdw_slave *slave,
- int port, bool enable, int mask)
- {
- u32 addr;
- int ret;
- u8 val = 0;
- if (slave->bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) {
- dev_dbg(&slave->dev, "TEST FAIL interrupt %s\n",
- enable ? "on" : "off");
- mask |= SDW_DPN_INT_TEST_FAIL;
- }
- addr = SDW_DPN_INTMASK(port);
- /* Set/Clear port ready interrupt mask */
- if (enable) {
- val |= mask;
- val |= SDW_DPN_INT_PORT_READY;
- } else {
- val &= ~(mask);
- val &= ~SDW_DPN_INT_PORT_READY;
- }
- ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
- if (ret < 0)
- dev_err(&slave->dev,
- "SDW_DPN_INTMASK write failed:%d\n", val);
- return ret;
- }
- static int sdw_slave_set_frequency(struct sdw_slave *slave)
- {
- u32 mclk_freq = slave->bus->prop.mclk_freq;
- u32 curr_freq = slave->bus->params.curr_dr_freq >> 1;
- unsigned int scale;
- u8 scale_index;
- u8 base;
- int ret;
- /*
- * frequency base and scale registers are required for SDCA
- * devices. They may also be used for 1.2+/non-SDCA devices,
- * but we will need a DisCo property to cover this case
- */
- if (!slave->id.class_id)
- return 0;
- if (!mclk_freq) {
- dev_err(&slave->dev,
- "no bus MCLK, cannot set SDW_SCP_BUS_CLOCK_BASE\n");
- return -EINVAL;
- }
- /*
- * map base frequency using Table 89 of SoundWire 1.2 spec.
- * The order of the tests just follows the specification, this
- * is not a selection between possible values or a search for
- * the best value but just a mapping. Only one case per platform
- * is relevant.
- * Some BIOS have inconsistent values for mclk_freq but a
- * correct root so we force the mclk_freq to avoid variations.
- */
- if (!(19200000 % mclk_freq)) {
- mclk_freq = 19200000;
- base = SDW_SCP_BASE_CLOCK_19200000_HZ;
- } else if (!(24000000 % mclk_freq)) {
- mclk_freq = 24000000;
- base = SDW_SCP_BASE_CLOCK_24000000_HZ;
- } else if (!(24576000 % mclk_freq)) {
- mclk_freq = 24576000;
- base = SDW_SCP_BASE_CLOCK_24576000_HZ;
- } else if (!(22579200 % mclk_freq)) {
- mclk_freq = 22579200;
- base = SDW_SCP_BASE_CLOCK_22579200_HZ;
- } else if (!(32000000 % mclk_freq)) {
- mclk_freq = 32000000;
- base = SDW_SCP_BASE_CLOCK_32000000_HZ;
- } else {
- dev_err(&slave->dev,
- "Unsupported clock base, mclk %d\n",
- mclk_freq);
- return -EINVAL;
- }
- if (mclk_freq % curr_freq) {
- dev_err(&slave->dev,
- "mclk %d is not multiple of bus curr_freq %d\n",
- mclk_freq, curr_freq);
- return -EINVAL;
- }
- scale = mclk_freq / curr_freq;
- /*
- * map scale to Table 90 of SoundWire 1.2 spec - and check
- * that the scale is a power of two and maximum 64
- */
- scale_index = ilog2(scale);
- if (BIT(scale_index) != scale || scale_index > 6) {
- dev_err(&slave->dev,
- "No match found for scale %d, bus mclk %d curr_freq %d\n",
- scale, mclk_freq, curr_freq);
- return -EINVAL;
- }
- scale_index++;
- ret = sdw_write_no_pm(slave, SDW_SCP_BUS_CLOCK_BASE, base);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_BUS_CLOCK_BASE write failed:%d\n", ret);
- return ret;
- }
- /* initialize scale for both banks */
- ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_BUSCLOCK_SCALE_B0 write failed:%d\n", ret);
- return ret;
- }
- ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index);
- if (ret < 0)
- dev_err(&slave->dev,
- "SDW_SCP_BUSCLOCK_SCALE_B1 write failed:%d\n", ret);
- dev_dbg(&slave->dev,
- "Configured bus base %d, scale %d, mclk %d, curr_freq %d\n",
- base, scale_index, mclk_freq, curr_freq);
- return ret;
- }
- static int sdw_initialize_slave(struct sdw_slave *slave)
- {
- struct sdw_slave_prop *prop = &slave->prop;
- int status;
- int ret;
- u8 val;
- ret = sdw_slave_set_frequency(slave);
- if (ret < 0)
- return ret;
- if (slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH) {
- /* Clear bus clash interrupt before enabling interrupt mask */
- status = sdw_read_no_pm(slave, SDW_SCP_INT1);
- if (status < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT1 (BUS_CLASH) read failed:%d\n", status);
- return status;
- }
- if (status & SDW_SCP_INT1_BUS_CLASH) {
- dev_warn(&slave->dev, "Bus clash detected before INT mask is enabled\n");
- ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_BUS_CLASH);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT1 (BUS_CLASH) write failed:%d\n", ret);
- return ret;
- }
- }
- }
- if ((slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY) &&
- !(slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY)) {
- /* Clear parity interrupt before enabling interrupt mask */
- status = sdw_read_no_pm(slave, SDW_SCP_INT1);
- if (status < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT1 (PARITY) read failed:%d\n", status);
- return status;
- }
- if (status & SDW_SCP_INT1_PARITY) {
- dev_warn(&slave->dev, "PARITY error detected before INT mask is enabled\n");
- ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_PARITY);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT1 (PARITY) write failed:%d\n", ret);
- return ret;
- }
- }
- }
- /*
- * Set SCP_INT1_MASK register, typically bus clash and
- * implementation-defined interrupt mask. The Parity detection
- * may not always be correct on startup so its use is
- * device-dependent, it might e.g. only be enabled in
- * steady-state after a couple of frames.
- */
- val = slave->prop.scp_int1_mask;
- /* Enable SCP interrupts */
- ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INTMASK1 write failed:%d\n", ret);
- return ret;
- }
- /* No need to continue if DP0 is not present */
- if (!slave->prop.dp0_prop)
- return 0;
- /* Enable DP0 interrupts */
- val = prop->dp0_prop->imp_def_interrupts;
- val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
- ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val);
- if (ret < 0)
- dev_err(&slave->dev,
- "SDW_DP0_INTMASK read failed:%d\n", ret);
- return ret;
- }
- static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
- {
- u8 clear, impl_int_mask;
- int status, status2, ret, count = 0;
- status = sdw_read_no_pm(slave, SDW_DP0_INT);
- if (status < 0) {
- dev_err(&slave->dev,
- "SDW_DP0_INT read failed:%d\n", status);
- return status;
- }
- do {
- clear = status & ~SDW_DP0_INTERRUPTS;
- if (status & SDW_DP0_INT_TEST_FAIL) {
- dev_err(&slave->dev, "Test fail for port 0\n");
- 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\n");
- 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 interrupts but don't touch reserved and SDCA_CASCADE fields */
- ret = sdw_write_no_pm(slave, SDW_DP0_INT, clear);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_DP0_INT write failed:%d\n", ret);
- return ret;
- }
- /* Read DP0 interrupt again */
- status2 = sdw_read_no_pm(slave, SDW_DP0_INT);
- if (status2 < 0) {
- dev_err(&slave->dev,
- "SDW_DP0_INT read failed:%d\n", status2);
- return status2;
- }
- /* filter to limit loop to interrupts identified in the first status read */
- status &= status2;
- count++;
- /* we can get alerts while processing so keep retrying */
- } while ((status & SDW_DP0_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
- if (count == SDW_READ_INTR_CLEAR_RETRY)
- dev_warn(&slave->dev, "Reached MAX_RETRY on DP0 read\n");
- return ret;
- }
- static int sdw_handle_port_interrupt(struct sdw_slave *slave,
- int port, u8 *slave_status)
- {
- u8 clear, 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_no_pm(slave, addr);
- if (status < 0) {
- dev_err(&slave->dev,
- "SDW_DPN_INT read failed:%d\n", status);
- return status;
- }
- do {
- clear = status & ~SDW_DPN_INTERRUPTS;
- if (status & SDW_DPN_INT_TEST_FAIL) {
- dev_err(&slave->dev, "Test fail for port:%d\n", 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 but don't touch reserved fields */
- ret = sdw_write_no_pm(slave, addr, clear);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_DPN_INT write failed:%d\n", ret);
- return ret;
- }
- /* Read DPN interrupt again */
- status2 = sdw_read_no_pm(slave, addr);
- if (status2 < 0) {
- dev_err(&slave->dev,
- "SDW_DPN_INT read failed:%d\n", status2);
- return status2;
- }
- /* filter to limit loop to interrupts identified in the first status read */
- status &= status2;
- count++;
- /* we can get alerts while processing so keep retrying */
- } while ((status & SDW_DPN_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
- if (count == SDW_READ_INTR_CLEAR_RETRY)
- dev_warn(&slave->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] = {0};
- int port_num, stat, ret, count = 0;
- unsigned long port;
- bool slave_notify;
- u8 sdca_cascade = 0;
- u8 buf, buf2[2], _buf, _buf2[2];
- bool parity_check;
- bool parity_quirk;
- sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
- ret = pm_runtime_get_sync(&slave->dev);
- if (ret < 0 && ret != -EACCES) {
- dev_err(&slave->dev, "Failed to resume device: %d\n", ret);
- pm_runtime_put_noidle(&slave->dev);
- return ret;
- }
- /* Read Intstat 1, Intstat 2 and Intstat 3 registers */
- ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT1 read failed:%d\n", ret);
- goto io_err;
- }
- buf = ret;
- ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, buf2);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT2/3 read failed:%d\n", ret);
- goto io_err;
- }
- if (slave->prop.is_sdca) {
- ret = sdw_read_no_pm(slave, SDW_DP0_INT);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_DP0_INT read failed:%d\n", ret);
- goto io_err;
- }
- sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
- }
- do {
- slave_notify = false;
- /*
- * Check parity, bus clash and Slave (impl defined)
- * interrupt
- */
- if (buf & SDW_SCP_INT1_PARITY) {
- parity_check = slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY;
- parity_quirk = !slave->first_interrupt_done &&
- (slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY);
- if (parity_check && !parity_quirk)
- dev_err(&slave->dev, "Parity error detected\n");
- clear |= SDW_SCP_INT1_PARITY;
- }
- if (buf & SDW_SCP_INT1_BUS_CLASH) {
- if (slave->prop.scp_int1_mask & SDW_SCP_INT1_BUS_CLASH)
- dev_err(&slave->dev, "Bus clash detected\n");
- 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) {
- if (slave->prop.scp_int1_mask & SDW_SCP_INT1_IMPL_DEF) {
- dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
- slave_notify = true;
- }
- clear |= SDW_SCP_INT1_IMPL_DEF;
- }
- /* the SDCA interrupts are cleared in the codec driver .interrupt_callback() */
- if (sdca_cascade)
- 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 = FIELD_GET(SDW_SCP_INT1_PORT0_3, port);
- 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 + 4;
- 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 + 11;
- sdw_handle_port_interrupt(slave,
- port_num,
- &port_status[port_num]);
- }
- }
- /* Update the Slave driver */
- if (slave_notify) {
- mutex_lock(&slave->sdw_dev_lock);
- if (slave->probed) {
- struct device *dev = &slave->dev;
- struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
- if (drv->ops && drv->ops->interrupt_callback) {
- slave_intr.sdca_cascade = sdca_cascade;
- slave_intr.control_port = clear;
- memcpy(slave_intr.port, &port_status,
- sizeof(slave_intr.port));
- drv->ops->interrupt_callback(slave, &slave_intr);
- }
- }
- mutex_unlock(&slave->sdw_dev_lock);
- }
- /* Ack interrupt */
- ret = sdw_write_no_pm(slave, SDW_SCP_INT1, clear);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT1 write failed:%d\n", ret);
- goto io_err;
- }
- /* at this point all initial interrupt sources were handled */
- slave->first_interrupt_done = true;
- /*
- * Read status again to ensure no new interrupts arrived
- * while servicing interrupts.
- */
- ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT1 recheck read failed:%d\n", ret);
- goto io_err;
- }
- _buf = ret;
- ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, _buf2);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_SCP_INT2/3 recheck read failed:%d\n", ret);
- goto io_err;
- }
- if (slave->prop.is_sdca) {
- ret = sdw_read_no_pm(slave, SDW_DP0_INT);
- if (ret < 0) {
- dev_err(&slave->dev,
- "SDW_DP0_INT recheck read failed:%d\n", ret);
- goto io_err;
- }
- sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
- }
- /*
- * Make sure no interrupts are pending, but filter to limit loop
- * to interrupts identified in the first status read
- */
- buf &= _buf;
- buf2[0] &= _buf2[0];
- buf2[1] &= _buf2[1];
- stat = buf || buf2[0] || buf2[1] || sdca_cascade;
- /*
- * 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->dev, "Reached MAX_RETRY on alert read\n");
- io_err:
- pm_runtime_mark_last_busy(&slave->dev);
- pm_runtime_put_autosuspend(&slave->dev);
- return ret;
- }
- static int sdw_update_slave_status(struct sdw_slave *slave,
- enum sdw_slave_status status)
- {
- int ret = 0;
- mutex_lock(&slave->sdw_dev_lock);
- if (slave->probed) {
- struct device *dev = &slave->dev;
- struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
- if (drv->ops && drv->ops->update_status)
- ret = drv->ops->update_status(slave, status);
- }
- mutex_unlock(&slave->sdw_dev_lock);
- return ret;
- }
- /**
- * 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;
- bool attached_initializing, id_programmed;
- int i, ret = 0;
- /* first check if any Slaves fell off the bus */
- 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;
- if (status[i] == SDW_SLAVE_UNATTACHED &&
- slave->status != SDW_SLAVE_UNATTACHED) {
- dev_warn(&slave->dev, "Slave %d state check1: UNATTACHED, status was %d\n",
- i, slave->status);
- sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
- /* Ensure driver knows that peripheral unattached */
- ret = sdw_update_slave_status(slave, status[i]);
- if (ret < 0)
- dev_warn(&slave->dev, "Update Slave status failed:%d\n", ret);
- }
- }
- if (status[0] == SDW_SLAVE_ATTACHED) {
- dev_dbg(bus->dev, "Slave attached, programming device number\n");
- /*
- * Programming a device number will have side effects,
- * so we deal with other devices at a later time.
- * This relies on those devices reporting ATTACHED, which will
- * trigger another call to this function. This will only
- * happen if at least one device ID was programmed.
- * Error returns from sdw_program_device_num() are currently
- * ignored because there's no useful recovery that can be done.
- * Returning the error here could result in the current status
- * of other devices not being handled, because if no device IDs
- * were programmed there's nothing to guarantee a status change
- * to trigger another call to this function.
- */
- sdw_program_device_num(bus, &id_programmed);
- if (id_programmed)
- return 0;
- }
- /* 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;
- attached_initializing = false;
- switch (status[i]) {
- case SDW_SLAVE_UNATTACHED:
- if (slave->status == SDW_SLAVE_UNATTACHED)
- break;
- dev_warn(&slave->dev, "Slave %d state check2: UNATTACHED, status was %d\n",
- i, slave->status);
- sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
- break;
- case SDW_SLAVE_ALERT:
- ret = sdw_handle_slave_alerts(slave);
- if (ret < 0)
- dev_err(&slave->dev,
- "Slave %d alert handling failed: %d\n",
- 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;
- attached_initializing = true;
- ret = sdw_initialize_slave(slave);
- if (ret < 0)
- dev_err(&slave->dev,
- "Slave %d initialization failed: %d\n",
- i, ret);
- break;
- default:
- dev_err(&slave->dev, "Invalid slave %d status:%d\n",
- i, status[i]);
- break;
- }
- ret = sdw_update_slave_status(slave, status[i]);
- if (ret < 0)
- dev_err(&slave->dev,
- "Update Slave status failed:%d\n", ret);
- if (attached_initializing) {
- dev_dbg(&slave->dev,
- "signaling initialization completion for Slave %d\n",
- slave->dev_num);
- complete_all(&slave->initialization_complete);
- /*
- * If the manager became pm_runtime active, the peripherals will be
- * restarted and attach, but their pm_runtime status may remain
- * suspended. If the 'update_slave_status' callback initiates
- * any sort of deferred processing, this processing would not be
- * cancelled on pm_runtime suspend.
- * To avoid such zombie states, we queue a request to resume.
- * This would be a no-op in case the peripheral was being resumed
- * by e.g. the ALSA/ASoC framework.
- */
- pm_request_resume(&slave->dev);
- }
- }
- return ret;
- }
- EXPORT_SYMBOL(sdw_handle_slave_status);
- void sdw_clear_slave_status(struct sdw_bus *bus, u32 request)
- {
- struct sdw_slave *slave;
- int i;
- /* Check all non-zero devices */
- 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;
- if (slave->status != SDW_SLAVE_UNATTACHED) {
- sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
- slave->first_interrupt_done = false;
- sdw_update_slave_status(slave, SDW_SLAVE_UNATTACHED);
- }
- /* keep track of request, used in pm_runtime resume */
- slave->unattach_request = request;
- }
- }
- EXPORT_SYMBOL(sdw_clear_slave_status);
|