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1870 lines
44 KiB
1870 lines
44 KiB
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
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// Copyright(c) 2015-17 Intel Corporation. |
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#include <linux/acpi.h> |
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#include <linux/delay.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/soundwire/sdw_registers.h> |
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#include <linux/soundwire/sdw.h> |
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#include "bus.h" |
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#include "sysfs_local.h" |
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static DEFINE_IDA(sdw_ida); |
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static int sdw_get_id(struct sdw_bus *bus) |
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{ |
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int rc = ida_alloc(&sdw_ida, GFP_KERNEL); |
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if (rc < 0) |
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return rc; |
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bus->id = rc; |
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return 0; |
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} |
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|
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/** |
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* sdw_bus_master_add() - add a bus Master instance |
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* @bus: bus instance |
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* @parent: parent device |
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* @fwnode: firmware node handle |
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* |
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* Initializes the bus instance, read properties and create child |
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* devices. |
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*/ |
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int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, |
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struct fwnode_handle *fwnode) |
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{ |
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struct sdw_master_prop *prop = NULL; |
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int ret; |
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if (!parent) { |
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pr_err("SoundWire parent device is not set\n"); |
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return -ENODEV; |
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} |
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ret = sdw_get_id(bus); |
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if (ret < 0) { |
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dev_err(parent, "Failed to get bus id\n"); |
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return ret; |
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} |
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ret = sdw_master_device_add(bus, parent, fwnode); |
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if (ret < 0) { |
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dev_err(parent, "Failed to add master device at link %d\n", |
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bus->link_id); |
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return ret; |
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} |
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if (!bus->ops) { |
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dev_err(bus->dev, "SoundWire Bus ops are not set\n"); |
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return -EINVAL; |
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} |
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if (!bus->compute_params) { |
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dev_err(bus->dev, |
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"Bandwidth allocation not configured, compute_params no set\n"); |
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return -EINVAL; |
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} |
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mutex_init(&bus->msg_lock); |
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mutex_init(&bus->bus_lock); |
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INIT_LIST_HEAD(&bus->slaves); |
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INIT_LIST_HEAD(&bus->m_rt_list); |
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/* |
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* Initialize multi_link flag |
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* TODO: populate this flag by reading property from FW node |
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*/ |
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bus->multi_link = false; |
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if (bus->ops->read_prop) { |
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ret = bus->ops->read_prop(bus); |
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if (ret < 0) { |
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dev_err(bus->dev, |
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"Bus read properties failed:%d\n", ret); |
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return ret; |
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} |
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} |
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sdw_bus_debugfs_init(bus); |
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/* |
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* Device numbers in SoundWire are 0 through 15. Enumeration device |
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* number (0), Broadcast device number (15), Group numbers (12 and |
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* 13) and Master device number (14) are not used for assignment so |
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* mask these and other higher bits. |
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*/ |
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/* Set higher order bits */ |
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*bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM); |
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/* Set enumuration device number and broadcast device number */ |
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set_bit(SDW_ENUM_DEV_NUM, bus->assigned); |
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set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned); |
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/* Set group device numbers and master device number */ |
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set_bit(SDW_GROUP12_DEV_NUM, bus->assigned); |
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set_bit(SDW_GROUP13_DEV_NUM, bus->assigned); |
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set_bit(SDW_MASTER_DEV_NUM, bus->assigned); |
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/* |
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* SDW is an enumerable bus, but devices can be powered off. So, |
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* they won't be able to report as present. |
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* |
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* Create Slave devices based on Slaves described in |
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* the respective firmware (ACPI/DT) |
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*/ |
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if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev)) |
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ret = sdw_acpi_find_slaves(bus); |
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else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node) |
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ret = sdw_of_find_slaves(bus); |
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else |
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ret = -ENOTSUPP; /* No ACPI/DT so error out */ |
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if (ret < 0) { |
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dev_err(bus->dev, "Finding slaves failed:%d\n", ret); |
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return ret; |
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} |
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/* |
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* Initialize clock values based on Master properties. The max |
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* frequency is read from max_clk_freq property. Current assumption |
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* is that the bus will start at highest clock frequency when |
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* powered on. |
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* |
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* Default active bank will be 0 as out of reset the Slaves have |
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* to start with bank 0 (Table 40 of Spec) |
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*/ |
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prop = &bus->prop; |
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bus->params.max_dr_freq = prop->max_clk_freq * SDW_DOUBLE_RATE_FACTOR; |
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bus->params.curr_dr_freq = bus->params.max_dr_freq; |
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bus->params.curr_bank = SDW_BANK0; |
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bus->params.next_bank = SDW_BANK1; |
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return 0; |
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} |
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EXPORT_SYMBOL(sdw_bus_master_add); |
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static int sdw_delete_slave(struct device *dev, void *data) |
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{ |
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struct sdw_slave *slave = dev_to_sdw_dev(dev); |
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struct sdw_bus *bus = slave->bus; |
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pm_runtime_disable(dev); |
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sdw_slave_debugfs_exit(slave); |
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mutex_lock(&bus->bus_lock); |
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if (slave->dev_num) /* clear dev_num if assigned */ |
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clear_bit(slave->dev_num, bus->assigned); |
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list_del_init(&slave->node); |
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mutex_unlock(&bus->bus_lock); |
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device_unregister(dev); |
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return 0; |
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} |
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/** |
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* sdw_bus_master_delete() - delete the bus master instance |
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* @bus: bus to be deleted |
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* |
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* Remove the instance, delete the child devices. |
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*/ |
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void sdw_bus_master_delete(struct sdw_bus *bus) |
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{ |
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device_for_each_child(bus->dev, NULL, sdw_delete_slave); |
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sdw_master_device_del(bus); |
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sdw_bus_debugfs_exit(bus); |
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ida_free(&sdw_ida, bus->id); |
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} |
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EXPORT_SYMBOL(sdw_bus_master_delete); |
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/* |
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* SDW IO Calls |
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*/ |
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static inline int find_response_code(enum sdw_command_response resp) |
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{ |
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switch (resp) { |
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case SDW_CMD_OK: |
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return 0; |
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case SDW_CMD_IGNORED: |
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return -ENODATA; |
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case SDW_CMD_TIMEOUT: |
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return -ETIMEDOUT; |
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default: |
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return -EIO; |
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} |
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} |
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static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg) |
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{ |
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int retry = bus->prop.err_threshold; |
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enum sdw_command_response resp; |
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int ret = 0, i; |
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for (i = 0; i <= retry; i++) { |
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resp = bus->ops->xfer_msg(bus, msg); |
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ret = find_response_code(resp); |
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/* if cmd is ok or ignored return */ |
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if (ret == 0 || ret == -ENODATA) |
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return ret; |
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} |
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return ret; |
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} |
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static inline int do_transfer_defer(struct sdw_bus *bus, |
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struct sdw_msg *msg, |
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struct sdw_defer *defer) |
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{ |
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int retry = bus->prop.err_threshold; |
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enum sdw_command_response resp; |
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int ret = 0, i; |
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defer->msg = msg; |
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defer->length = msg->len; |
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init_completion(&defer->complete); |
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for (i = 0; i <= retry; i++) { |
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resp = bus->ops->xfer_msg_defer(bus, msg, defer); |
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ret = find_response_code(resp); |
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/* if cmd is ok or ignored return */ |
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if (ret == 0 || ret == -ENODATA) |
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return ret; |
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} |
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return ret; |
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} |
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static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num) |
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{ |
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int retry = bus->prop.err_threshold; |
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enum sdw_command_response resp; |
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int ret = 0, i; |
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for (i = 0; i <= retry; i++) { |
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resp = bus->ops->reset_page_addr(bus, dev_num); |
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ret = find_response_code(resp); |
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/* if cmd is ok or ignored return */ |
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if (ret == 0 || ret == -ENODATA) |
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return ret; |
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} |
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return ret; |
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} |
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static int sdw_transfer_unlocked(struct sdw_bus *bus, struct sdw_msg *msg) |
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{ |
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int ret; |
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ret = do_transfer(bus, msg); |
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if (ret != 0 && ret != -ENODATA) |
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dev_err(bus->dev, "trf on Slave %d failed:%d %s addr %x count %d\n", |
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msg->dev_num, ret, |
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(msg->flags & SDW_MSG_FLAG_WRITE) ? "write" : "read", |
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msg->addr, msg->len); |
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if (msg->page) |
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sdw_reset_page(bus, msg->dev_num); |
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return ret; |
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} |
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/** |
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* sdw_transfer() - Synchronous transfer message to a SDW Slave device |
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* @bus: SDW bus |
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* @msg: SDW message to be xfered |
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*/ |
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int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg) |
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{ |
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int ret; |
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mutex_lock(&bus->msg_lock); |
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ret = sdw_transfer_unlocked(bus, msg); |
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mutex_unlock(&bus->msg_lock); |
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return ret; |
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} |
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/** |
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* sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device |
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* @bus: SDW bus |
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* @msg: SDW message to be xfered |
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* @defer: Defer block for signal completion |
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* |
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* Caller needs to hold the msg_lock lock while calling this |
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*/ |
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int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg, |
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struct sdw_defer *defer) |
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{ |
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int ret; |
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if (!bus->ops->xfer_msg_defer) |
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return -ENOTSUPP; |
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ret = do_transfer_defer(bus, msg, defer); |
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if (ret != 0 && ret != -ENODATA) |
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dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n", |
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msg->dev_num, ret); |
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if (msg->page) |
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sdw_reset_page(bus, msg->dev_num); |
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return ret; |
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} |
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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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{ |
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memset(msg, 0, sizeof(*msg)); |
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msg->addr = addr; /* addr is 16 bit and truncated here */ |
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msg->len = count; |
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msg->dev_num = dev_num; |
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msg->flags = flags; |
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msg->buf = buf; |
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if (addr < SDW_REG_NO_PAGE) /* no paging area */ |
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return 0; |
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if (addr >= SDW_REG_MAX) { /* illegal addr */ |
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pr_err("SDW: Invalid address %x passed\n", addr); |
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return -EINVAL; |
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} |
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if (addr < SDW_REG_OPTIONAL_PAGE) { /* 32k but no page */ |
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if (slave && !slave->prop.paging_support) |
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return 0; |
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/* no need for else as that will fall-through to paging */ |
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} |
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/* paging mandatory */ |
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if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) { |
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pr_err("SDW: Invalid device for paging :%d\n", dev_num); |
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return -EINVAL; |
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} |
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if (!slave) { |
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pr_err("SDW: No slave for paging addr\n"); |
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return -EINVAL; |
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} |
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if (!slave->prop.paging_support) { |
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dev_err(&slave->dev, |
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"address %x needs paging but no support\n", addr); |
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return -EINVAL; |
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} |
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msg->addr_page1 = FIELD_GET(SDW_SCP_ADDRPAGE1_MASK, addr); |
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msg->addr_page2 = FIELD_GET(SDW_SCP_ADDRPAGE2_MASK, addr); |
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msg->addr |= BIT(15); |
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msg->page = true; |
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return 0; |
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} |
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/* |
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* Read/Write IO functions. |
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* no_pm versions can only be called by the bus, e.g. while enumerating or |
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* handling suspend-resume sequences. |
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* all clients need to use the pm versions |
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*/ |
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static int |
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sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) |
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{ |
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struct sdw_msg msg; |
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int ret; |
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ret = sdw_fill_msg(&msg, slave, addr, count, |
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slave->dev_num, SDW_MSG_FLAG_READ, val); |
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if (ret < 0) |
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return ret; |
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ret = sdw_transfer(slave->bus, &msg); |
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if (slave->is_mockup_device) |
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ret = 0; |
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return ret; |
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} |
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static int |
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sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val) |
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{ |
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struct sdw_msg msg; |
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int ret; |
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ret = sdw_fill_msg(&msg, slave, addr, count, |
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slave->dev_num, SDW_MSG_FLAG_WRITE, (u8 *)val); |
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if (ret < 0) |
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return ret; |
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ret = sdw_transfer(slave->bus, &msg); |
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if (slave->is_mockup_device) |
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ret = 0; |
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return ret; |
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} |
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int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value) |
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{ |
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return sdw_nwrite_no_pm(slave, addr, 1, &value); |
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} |
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EXPORT_SYMBOL(sdw_write_no_pm); |
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static int |
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sdw_bread_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr) |
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{ |
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struct sdw_msg msg; |
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u8 buf; |
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int ret; |
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ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, |
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SDW_MSG_FLAG_READ, &buf); |
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if (ret < 0) |
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return ret; |
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ret = sdw_transfer(bus, &msg); |
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if (ret < 0) |
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return ret; |
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return buf; |
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} |
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static int |
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sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value) |
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{ |
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struct sdw_msg msg; |
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int ret; |
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ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, |
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SDW_MSG_FLAG_WRITE, &value); |
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if (ret < 0) |
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return ret; |
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return sdw_transfer(bus, &msg); |
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} |
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int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr) |
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{ |
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struct sdw_msg msg; |
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u8 buf; |
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int ret; |
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ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, |
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SDW_MSG_FLAG_READ, &buf); |
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if (ret < 0) |
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return ret; |
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ret = sdw_transfer_unlocked(bus, &msg); |
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if (ret < 0) |
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return ret; |
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return buf; |
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} |
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EXPORT_SYMBOL(sdw_bread_no_pm_unlocked); |
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int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value) |
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{ |
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struct sdw_msg msg; |
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int ret; |
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ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, |
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SDW_MSG_FLAG_WRITE, &value); |
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if (ret < 0) |
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return ret; |
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return sdw_transfer_unlocked(bus, &msg); |
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} |
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EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked); |
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int sdw_read_no_pm(struct sdw_slave *slave, u32 addr) |
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{ |
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u8 buf; |
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int ret; |
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ret = sdw_nread_no_pm(slave, addr, 1, &buf); |
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if (ret < 0) |
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return ret; |
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else |
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return buf; |
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} |
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EXPORT_SYMBOL(sdw_read_no_pm); |
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|
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int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) |
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{ |
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int tmp; |
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|
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tmp = sdw_read_no_pm(slave, addr); |
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if (tmp < 0) |
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return tmp; |
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|
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tmp = (tmp & ~mask) | val; |
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return sdw_write_no_pm(slave, addr, tmp); |
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} |
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EXPORT_SYMBOL(sdw_update_no_pm); |
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|
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/* Read-Modify-Write Slave register */ |
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int 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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|
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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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|
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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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EXPORT_SYMBOL(sdw_update); |
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|
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/** |
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* sdw_nread() - Read "n" contiguous SDW Slave registers |
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* @slave: SDW Slave |
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* @addr: Register address |
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* @count: length |
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* @val: Buffer for values to be read |
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*/ |
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int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) |
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{ |
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int ret; |
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|
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ret = pm_runtime_get_sync(&slave->dev); |
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if (ret < 0 && ret != -EACCES) { |
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pm_runtime_put_noidle(&slave->dev); |
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return ret; |
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} |
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|
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ret = sdw_nread_no_pm(slave, addr, count, val); |
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|
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pm_runtime_mark_last_busy(&slave->dev); |
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pm_runtime_put(&slave->dev); |
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|
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return ret; |
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} |
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EXPORT_SYMBOL(sdw_nread); |
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|
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/** |
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* sdw_nwrite() - Write "n" contiguous SDW Slave registers |
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* @slave: SDW Slave |
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* @addr: Register address |
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* @count: length |
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* @val: Buffer for values to be written |
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*/ |
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int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val) |
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{ |
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int ret; |
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|
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ret = pm_runtime_get_sync(&slave->dev); |
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if (ret < 0 && ret != -EACCES) { |
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pm_runtime_put_noidle(&slave->dev); |
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return ret; |
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} |
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|
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ret = sdw_nwrite_no_pm(slave, addr, count, val); |
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|
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pm_runtime_mark_last_busy(&slave->dev); |
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pm_runtime_put(&slave->dev); |
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|
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return ret; |
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} |
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EXPORT_SYMBOL(sdw_nwrite); |
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|
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/** |
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* sdw_read() - Read a SDW Slave register |
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* @slave: SDW Slave |
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* @addr: Register address |
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*/ |
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int sdw_read(struct sdw_slave *slave, u32 addr) |
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{ |
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u8 buf; |
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int ret; |
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|
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ret = sdw_nread(slave, addr, 1, &buf); |
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if (ret < 0) |
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return ret; |
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|
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return buf; |
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} |
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EXPORT_SYMBOL(sdw_read); |
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|
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/** |
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* sdw_write() - Write a SDW Slave register |
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* @slave: SDW Slave |
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* @addr: Register address |
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* @value: Register value |
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*/ |
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int sdw_write(struct sdw_slave *slave, u32 addr, u8 value) |
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{ |
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return sdw_nwrite(slave, addr, 1, &value); |
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} |
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EXPORT_SYMBOL(sdw_write); |
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|
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/* |
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* 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; |
|
|
|
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) |
|
{ |
|
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; |
|
|
|
/* 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; |
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
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, |
|
"%s: changing status slave %d status %d new status %d\n", |
|
__func__, slave->dev_num, slave->status, status); |
|
|
|
if (status == SDW_SLAVE_UNATTACHED) { |
|
dev_dbg(&slave->dev, |
|
"%s: initializing enumeration and init completion for Slave %d\n", |
|
__func__, slave->dev_num); |
|
|
|
init_completion(&slave->enumeration_complete); |
|
init_completion(&slave->initialization_complete); |
|
|
|
} else if ((status == SDW_SLAVE_ATTACHED) && |
|
(slave->status == SDW_SLAVE_UNATTACHED)) { |
|
dev_dbg(&slave->dev, |
|
"%s: signaling enumeration completion for Slave %d\n", |
|
__func__, slave->dev_num); |
|
|
|
complete(&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; |
|
|
|
if (slave->ops && slave->ops->clk_stop) { |
|
ret = slave->ops->clk_stop(slave, mode, type); |
|
if (ret < 0) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
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(&slave->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 + 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.sdca_cascade = sdca_cascade; |
|
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_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) |
|
{ |
|
unsigned long time; |
|
|
|
if (!slave->probed) { |
|
/* |
|
* the slave status update is typically handled in an |
|
* interrupt thread, which can race with the driver |
|
* probe, e.g. when a module needs to be loaded. |
|
* |
|
* make sure the probe is complete before updating |
|
* status. |
|
*/ |
|
time = wait_for_completion_timeout(&slave->probe_complete, |
|
msecs_to_jiffies(DEFAULT_PROBE_TIMEOUT)); |
|
if (!time) { |
|
dev_err(&slave->dev, "Probe not complete, timed out\n"); |
|
return -ETIMEDOUT; |
|
} |
|
} |
|
|
|
if (!slave->ops || !slave->ops->update_status) |
|
return 0; |
|
|
|
return slave->ops->update_status(slave, status); |
|
} |
|
|
|
/** |
|
* 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; |
|
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) |
|
sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED); |
|
} |
|
|
|
if (status[0] == SDW_SLAVE_ATTACHED) { |
|
dev_dbg(bus->dev, "Slave attached, programming device number\n"); |
|
ret = sdw_program_device_num(bus); |
|
if (ret < 0) |
|
dev_err(bus->dev, "Slave attach failed: %d\n", ret); |
|
/* |
|
* programming a device number will have side effects, |
|
* so we deal with other devices at a later time |
|
*/ |
|
return 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; |
|
|
|
attached_initializing = false; |
|
|
|
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 < 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, |
|
"%s: signaling initialization completion for Slave %d\n", |
|
__func__, slave->dev_num); |
|
|
|
complete(&slave->initialization_complete); |
|
} |
|
} |
|
|
|
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);
|
|
|