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2714 lines
67 KiB
2714 lines
67 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2018 Cadence Design Systems Inc. |
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* |
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* Author: Boris Brezillon <[email protected]> |
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*/ |
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|
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#include <linux/atomic.h> |
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#include <linux/bug.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/export.h> |
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#include <linux/kernel.h> |
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#include <linux/list.h> |
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#include <linux/of.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/workqueue.h> |
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|
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#include "internals.h" |
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|
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static DEFINE_IDR(i3c_bus_idr); |
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static DEFINE_MUTEX(i3c_core_lock); |
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|
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/** |
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* i3c_bus_maintenance_lock - Lock the bus for a maintenance operation |
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* @bus: I3C bus to take the lock on |
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* |
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* This function takes the bus lock so that no other operations can occur on |
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* the bus. This is needed for all kind of bus maintenance operation, like |
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* - enabling/disabling slave events |
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* - re-triggering DAA |
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* - changing the dynamic address of a device |
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* - relinquishing mastership |
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* - ... |
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* |
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* The reason for this kind of locking is that we don't want drivers and core |
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* logic to rely on I3C device information that could be changed behind their |
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* back. |
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*/ |
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static void i3c_bus_maintenance_lock(struct i3c_bus *bus) |
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{ |
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down_write(&bus->lock); |
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} |
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|
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/** |
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* i3c_bus_maintenance_unlock - Release the bus lock after a maintenance |
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* operation |
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* @bus: I3C bus to release the lock on |
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* |
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* Should be called when the bus maintenance operation is done. See |
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* i3c_bus_maintenance_lock() for more details on what these maintenance |
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* operations are. |
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*/ |
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static void i3c_bus_maintenance_unlock(struct i3c_bus *bus) |
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{ |
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up_write(&bus->lock); |
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} |
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|
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/** |
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* i3c_bus_normaluse_lock - Lock the bus for a normal operation |
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* @bus: I3C bus to take the lock on |
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* |
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* This function takes the bus lock for any operation that is not a maintenance |
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* operation (see i3c_bus_maintenance_lock() for a non-exhaustive list of |
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* maintenance operations). Basically all communications with I3C devices are |
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* normal operations (HDR, SDR transfers or CCC commands that do not change bus |
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* state or I3C dynamic address). |
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* |
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* Note that this lock is not guaranteeing serialization of normal operations. |
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* In other words, transfer requests passed to the I3C master can be submitted |
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* in parallel and I3C master drivers have to use their own locking to make |
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* sure two different communications are not inter-mixed, or access to the |
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* output/input queue is not done while the engine is busy. |
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*/ |
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void i3c_bus_normaluse_lock(struct i3c_bus *bus) |
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{ |
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down_read(&bus->lock); |
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} |
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|
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/** |
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* i3c_bus_normaluse_unlock - Release the bus lock after a normal operation |
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* @bus: I3C bus to release the lock on |
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* |
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* Should be called when a normal operation is done. See |
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* i3c_bus_normaluse_lock() for more details on what these normal operations |
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* are. |
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*/ |
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void i3c_bus_normaluse_unlock(struct i3c_bus *bus) |
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{ |
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up_read(&bus->lock); |
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} |
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static struct i3c_master_controller * |
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i3c_bus_to_i3c_master(struct i3c_bus *i3cbus) |
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{ |
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return container_of(i3cbus, struct i3c_master_controller, bus); |
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} |
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static struct i3c_master_controller *dev_to_i3cmaster(struct device *dev) |
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{ |
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return container_of(dev, struct i3c_master_controller, dev); |
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} |
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static const struct device_type i3c_device_type; |
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static struct i3c_bus *dev_to_i3cbus(struct device *dev) |
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{ |
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struct i3c_master_controller *master; |
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|
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if (dev->type == &i3c_device_type) |
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return dev_to_i3cdev(dev)->bus; |
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master = dev_to_i3cmaster(dev); |
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return &master->bus; |
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} |
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static struct i3c_dev_desc *dev_to_i3cdesc(struct device *dev) |
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{ |
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struct i3c_master_controller *master; |
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if (dev->type == &i3c_device_type) |
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return dev_to_i3cdev(dev)->desc; |
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master = dev_to_i3cmaster(dev); |
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return master->this; |
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} |
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static ssize_t bcr_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *bus = dev_to_i3cbus(dev); |
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struct i3c_dev_desc *desc; |
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ssize_t ret; |
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i3c_bus_normaluse_lock(bus); |
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desc = dev_to_i3cdesc(dev); |
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ret = sprintf(buf, "%x\n", desc->info.bcr); |
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i3c_bus_normaluse_unlock(bus); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(bcr); |
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static ssize_t dcr_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *bus = dev_to_i3cbus(dev); |
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struct i3c_dev_desc *desc; |
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ssize_t ret; |
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i3c_bus_normaluse_lock(bus); |
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desc = dev_to_i3cdesc(dev); |
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ret = sprintf(buf, "%x\n", desc->info.dcr); |
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i3c_bus_normaluse_unlock(bus); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(dcr); |
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static ssize_t pid_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *bus = dev_to_i3cbus(dev); |
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struct i3c_dev_desc *desc; |
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ssize_t ret; |
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i3c_bus_normaluse_lock(bus); |
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desc = dev_to_i3cdesc(dev); |
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ret = sprintf(buf, "%llx\n", desc->info.pid); |
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i3c_bus_normaluse_unlock(bus); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(pid); |
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static ssize_t dynamic_address_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *bus = dev_to_i3cbus(dev); |
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struct i3c_dev_desc *desc; |
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ssize_t ret; |
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i3c_bus_normaluse_lock(bus); |
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desc = dev_to_i3cdesc(dev); |
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ret = sprintf(buf, "%02x\n", desc->info.dyn_addr); |
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i3c_bus_normaluse_unlock(bus); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(dynamic_address); |
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static const char * const hdrcap_strings[] = { |
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"hdr-ddr", "hdr-tsp", "hdr-tsl", |
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}; |
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static ssize_t hdrcap_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *bus = dev_to_i3cbus(dev); |
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struct i3c_dev_desc *desc; |
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ssize_t offset = 0, ret; |
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unsigned long caps; |
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int mode; |
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i3c_bus_normaluse_lock(bus); |
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desc = dev_to_i3cdesc(dev); |
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caps = desc->info.hdr_cap; |
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for_each_set_bit(mode, &caps, 8) { |
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if (mode >= ARRAY_SIZE(hdrcap_strings)) |
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break; |
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if (!hdrcap_strings[mode]) |
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continue; |
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ret = sprintf(buf + offset, offset ? " %s" : "%s", |
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hdrcap_strings[mode]); |
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if (ret < 0) |
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goto out; |
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offset += ret; |
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} |
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ret = sprintf(buf + offset, "\n"); |
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if (ret < 0) |
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goto out; |
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ret = offset + ret; |
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out: |
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i3c_bus_normaluse_unlock(bus); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(hdrcap); |
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static ssize_t modalias_show(struct device *dev, |
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struct device_attribute *da, char *buf) |
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{ |
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struct i3c_device *i3c = dev_to_i3cdev(dev); |
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struct i3c_device_info devinfo; |
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u16 manuf, part, ext; |
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i3c_device_get_info(i3c, &devinfo); |
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manuf = I3C_PID_MANUF_ID(devinfo.pid); |
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part = I3C_PID_PART_ID(devinfo.pid); |
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ext = I3C_PID_EXTRA_INFO(devinfo.pid); |
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if (I3C_PID_RND_LOWER_32BITS(devinfo.pid)) |
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return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr, |
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manuf); |
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return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X", |
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devinfo.dcr, manuf, part, ext); |
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} |
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static DEVICE_ATTR_RO(modalias); |
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static struct attribute *i3c_device_attrs[] = { |
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&dev_attr_bcr.attr, |
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&dev_attr_dcr.attr, |
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&dev_attr_pid.attr, |
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&dev_attr_dynamic_address.attr, |
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&dev_attr_hdrcap.attr, |
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&dev_attr_modalias.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(i3c_device); |
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static int i3c_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
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{ |
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struct i3c_device *i3cdev = dev_to_i3cdev(dev); |
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struct i3c_device_info devinfo; |
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u16 manuf, part, ext; |
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i3c_device_get_info(i3cdev, &devinfo); |
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manuf = I3C_PID_MANUF_ID(devinfo.pid); |
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part = I3C_PID_PART_ID(devinfo.pid); |
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ext = I3C_PID_EXTRA_INFO(devinfo.pid); |
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if (I3C_PID_RND_LOWER_32BITS(devinfo.pid)) |
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return add_uevent_var(env, "MODALIAS=i3c:dcr%02Xmanuf%04X", |
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devinfo.dcr, manuf); |
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return add_uevent_var(env, |
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"MODALIAS=i3c:dcr%02Xmanuf%04Xpart%04Xext%04X", |
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devinfo.dcr, manuf, part, ext); |
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} |
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static const struct device_type i3c_device_type = { |
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.groups = i3c_device_groups, |
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.uevent = i3c_device_uevent, |
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}; |
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static int i3c_device_match(struct device *dev, struct device_driver *drv) |
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{ |
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struct i3c_device *i3cdev; |
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struct i3c_driver *i3cdrv; |
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if (dev->type != &i3c_device_type) |
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return 0; |
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i3cdev = dev_to_i3cdev(dev); |
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i3cdrv = drv_to_i3cdrv(drv); |
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if (i3c_device_match_id(i3cdev, i3cdrv->id_table)) |
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return 1; |
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return 0; |
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} |
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static int i3c_device_probe(struct device *dev) |
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{ |
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struct i3c_device *i3cdev = dev_to_i3cdev(dev); |
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struct i3c_driver *driver = drv_to_i3cdrv(dev->driver); |
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return driver->probe(i3cdev); |
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} |
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static int i3c_device_remove(struct device *dev) |
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{ |
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struct i3c_device *i3cdev = dev_to_i3cdev(dev); |
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struct i3c_driver *driver = drv_to_i3cdrv(dev->driver); |
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if (driver->remove) |
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driver->remove(i3cdev); |
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i3c_device_free_ibi(i3cdev); |
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return 0; |
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} |
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struct bus_type i3c_bus_type = { |
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.name = "i3c", |
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.match = i3c_device_match, |
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.probe = i3c_device_probe, |
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.remove = i3c_device_remove, |
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}; |
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static enum i3c_addr_slot_status |
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i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr) |
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{ |
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int status, bitpos = addr * 2; |
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if (addr > I2C_MAX_ADDR) |
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return I3C_ADDR_SLOT_RSVD; |
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status = bus->addrslots[bitpos / BITS_PER_LONG]; |
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status >>= bitpos % BITS_PER_LONG; |
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return status & I3C_ADDR_SLOT_STATUS_MASK; |
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} |
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static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr, |
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enum i3c_addr_slot_status status) |
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{ |
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int bitpos = addr * 2; |
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unsigned long *ptr; |
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if (addr > I2C_MAX_ADDR) |
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return; |
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ptr = bus->addrslots + (bitpos / BITS_PER_LONG); |
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*ptr &= ~((unsigned long)I3C_ADDR_SLOT_STATUS_MASK << |
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(bitpos % BITS_PER_LONG)); |
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*ptr |= (unsigned long)status << (bitpos % BITS_PER_LONG); |
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} |
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static bool i3c_bus_dev_addr_is_avail(struct i3c_bus *bus, u8 addr) |
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{ |
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enum i3c_addr_slot_status status; |
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status = i3c_bus_get_addr_slot_status(bus, addr); |
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return status == I3C_ADDR_SLOT_FREE; |
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} |
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static int i3c_bus_get_free_addr(struct i3c_bus *bus, u8 start_addr) |
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{ |
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enum i3c_addr_slot_status status; |
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u8 addr; |
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for (addr = start_addr; addr < I3C_MAX_ADDR; addr++) { |
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status = i3c_bus_get_addr_slot_status(bus, addr); |
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if (status == I3C_ADDR_SLOT_FREE) |
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return addr; |
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} |
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return -ENOMEM; |
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} |
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static void i3c_bus_init_addrslots(struct i3c_bus *bus) |
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{ |
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int i; |
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|
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/* Addresses 0 to 7 are reserved. */ |
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for (i = 0; i < 8; i++) |
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i3c_bus_set_addr_slot_status(bus, i, I3C_ADDR_SLOT_RSVD); |
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|
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/* |
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* Reserve broadcast address and all addresses that might collide |
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* with the broadcast address when facing a single bit error. |
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*/ |
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i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR, |
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I3C_ADDR_SLOT_RSVD); |
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for (i = 0; i < 7; i++) |
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i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR ^ BIT(i), |
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I3C_ADDR_SLOT_RSVD); |
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} |
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static void i3c_bus_cleanup(struct i3c_bus *i3cbus) |
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{ |
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mutex_lock(&i3c_core_lock); |
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idr_remove(&i3c_bus_idr, i3cbus->id); |
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mutex_unlock(&i3c_core_lock); |
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} |
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static int i3c_bus_init(struct i3c_bus *i3cbus) |
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{ |
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int ret; |
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init_rwsem(&i3cbus->lock); |
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INIT_LIST_HEAD(&i3cbus->devs.i2c); |
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INIT_LIST_HEAD(&i3cbus->devs.i3c); |
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i3c_bus_init_addrslots(i3cbus); |
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i3cbus->mode = I3C_BUS_MODE_PURE; |
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mutex_lock(&i3c_core_lock); |
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ret = idr_alloc(&i3c_bus_idr, i3cbus, 0, 0, GFP_KERNEL); |
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mutex_unlock(&i3c_core_lock); |
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if (ret < 0) |
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return ret; |
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i3cbus->id = ret; |
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return 0; |
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} |
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static const char * const i3c_bus_mode_strings[] = { |
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[I3C_BUS_MODE_PURE] = "pure", |
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[I3C_BUS_MODE_MIXED_FAST] = "mixed-fast", |
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[I3C_BUS_MODE_MIXED_LIMITED] = "mixed-limited", |
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[I3C_BUS_MODE_MIXED_SLOW] = "mixed-slow", |
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}; |
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static ssize_t mode_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *i3cbus = dev_to_i3cbus(dev); |
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ssize_t ret; |
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|
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i3c_bus_normaluse_lock(i3cbus); |
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if (i3cbus->mode < 0 || |
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i3cbus->mode >= ARRAY_SIZE(i3c_bus_mode_strings) || |
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!i3c_bus_mode_strings[i3cbus->mode]) |
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ret = sprintf(buf, "unknown\n"); |
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else |
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ret = sprintf(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]); |
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i3c_bus_normaluse_unlock(i3cbus); |
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|
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return ret; |
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} |
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static DEVICE_ATTR_RO(mode); |
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|
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static ssize_t current_master_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *i3cbus = dev_to_i3cbus(dev); |
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ssize_t ret; |
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|
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i3c_bus_normaluse_lock(i3cbus); |
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ret = sprintf(buf, "%d-%llx\n", i3cbus->id, |
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i3cbus->cur_master->info.pid); |
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i3c_bus_normaluse_unlock(i3cbus); |
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|
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return ret; |
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} |
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static DEVICE_ATTR_RO(current_master); |
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|
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static ssize_t i3c_scl_frequency_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *i3cbus = dev_to_i3cbus(dev); |
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ssize_t ret; |
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|
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i3c_bus_normaluse_lock(i3cbus); |
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ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i3c); |
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i3c_bus_normaluse_unlock(i3cbus); |
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|
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return ret; |
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} |
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static DEVICE_ATTR_RO(i3c_scl_frequency); |
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|
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static ssize_t i2c_scl_frequency_show(struct device *dev, |
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struct device_attribute *da, |
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char *buf) |
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{ |
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struct i3c_bus *i3cbus = dev_to_i3cbus(dev); |
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ssize_t ret; |
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|
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i3c_bus_normaluse_lock(i3cbus); |
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ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i2c); |
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i3c_bus_normaluse_unlock(i3cbus); |
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|
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return ret; |
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} |
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static DEVICE_ATTR_RO(i2c_scl_frequency); |
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|
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static struct attribute *i3c_masterdev_attrs[] = { |
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&dev_attr_mode.attr, |
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&dev_attr_current_master.attr, |
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&dev_attr_i3c_scl_frequency.attr, |
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&dev_attr_i2c_scl_frequency.attr, |
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&dev_attr_bcr.attr, |
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&dev_attr_dcr.attr, |
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&dev_attr_pid.attr, |
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&dev_attr_dynamic_address.attr, |
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&dev_attr_hdrcap.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(i3c_masterdev); |
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|
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static void i3c_masterdev_release(struct device *dev) |
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{ |
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struct i3c_master_controller *master = dev_to_i3cmaster(dev); |
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struct i3c_bus *bus = dev_to_i3cbus(dev); |
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|
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if (master->wq) |
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destroy_workqueue(master->wq); |
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|
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WARN_ON(!list_empty(&bus->devs.i2c) || !list_empty(&bus->devs.i3c)); |
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i3c_bus_cleanup(bus); |
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|
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of_node_put(dev->of_node); |
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} |
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|
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static const struct device_type i3c_masterdev_type = { |
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.groups = i3c_masterdev_groups, |
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}; |
|
|
|
static int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode, |
|
unsigned long max_i2c_scl_rate) |
|
{ |
|
struct i3c_master_controller *master = i3c_bus_to_i3c_master(i3cbus); |
|
|
|
i3cbus->mode = mode; |
|
|
|
switch (i3cbus->mode) { |
|
case I3C_BUS_MODE_PURE: |
|
if (!i3cbus->scl_rate.i3c) |
|
i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE; |
|
break; |
|
case I3C_BUS_MODE_MIXED_FAST: |
|
case I3C_BUS_MODE_MIXED_LIMITED: |
|
if (!i3cbus->scl_rate.i3c) |
|
i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE; |
|
if (!i3cbus->scl_rate.i2c) |
|
i3cbus->scl_rate.i2c = max_i2c_scl_rate; |
|
break; |
|
case I3C_BUS_MODE_MIXED_SLOW: |
|
if (!i3cbus->scl_rate.i2c) |
|
i3cbus->scl_rate.i2c = max_i2c_scl_rate; |
|
if (!i3cbus->scl_rate.i3c || |
|
i3cbus->scl_rate.i3c > i3cbus->scl_rate.i2c) |
|
i3cbus->scl_rate.i3c = i3cbus->scl_rate.i2c; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
dev_dbg(&master->dev, "i2c-scl = %ld Hz i3c-scl = %ld Hz\n", |
|
i3cbus->scl_rate.i2c, i3cbus->scl_rate.i3c); |
|
|
|
/* |
|
* I3C/I2C frequency may have been overridden, check that user-provided |
|
* values are not exceeding max possible frequency. |
|
*/ |
|
if (i3cbus->scl_rate.i3c > I3C_BUS_MAX_I3C_SCL_RATE || |
|
i3cbus->scl_rate.i2c > I3C_BUS_I2C_FM_PLUS_SCL_RATE) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static struct i3c_master_controller * |
|
i2c_adapter_to_i3c_master(struct i2c_adapter *adap) |
|
{ |
|
return container_of(adap, struct i3c_master_controller, i2c); |
|
} |
|
|
|
static struct i2c_adapter * |
|
i3c_master_to_i2c_adapter(struct i3c_master_controller *master) |
|
{ |
|
return &master->i2c; |
|
} |
|
|
|
static void i3c_master_free_i2c_dev(struct i2c_dev_desc *dev) |
|
{ |
|
kfree(dev); |
|
} |
|
|
|
static struct i2c_dev_desc * |
|
i3c_master_alloc_i2c_dev(struct i3c_master_controller *master, |
|
const struct i2c_dev_boardinfo *boardinfo) |
|
{ |
|
struct i2c_dev_desc *dev; |
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
|
if (!dev) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
dev->common.master = master; |
|
dev->boardinfo = boardinfo; |
|
dev->addr = boardinfo->base.addr; |
|
dev->lvr = boardinfo->lvr; |
|
|
|
return dev; |
|
} |
|
|
|
static void *i3c_ccc_cmd_dest_init(struct i3c_ccc_cmd_dest *dest, u8 addr, |
|
u16 payloadlen) |
|
{ |
|
dest->addr = addr; |
|
dest->payload.len = payloadlen; |
|
if (payloadlen) |
|
dest->payload.data = kzalloc(payloadlen, GFP_KERNEL); |
|
else |
|
dest->payload.data = NULL; |
|
|
|
return dest->payload.data; |
|
} |
|
|
|
static void i3c_ccc_cmd_dest_cleanup(struct i3c_ccc_cmd_dest *dest) |
|
{ |
|
kfree(dest->payload.data); |
|
} |
|
|
|
static void i3c_ccc_cmd_init(struct i3c_ccc_cmd *cmd, bool rnw, u8 id, |
|
struct i3c_ccc_cmd_dest *dests, |
|
unsigned int ndests) |
|
{ |
|
cmd->rnw = rnw ? 1 : 0; |
|
cmd->id = id; |
|
cmd->dests = dests; |
|
cmd->ndests = ndests; |
|
cmd->err = I3C_ERROR_UNKNOWN; |
|
} |
|
|
|
static int i3c_master_send_ccc_cmd_locked(struct i3c_master_controller *master, |
|
struct i3c_ccc_cmd *cmd) |
|
{ |
|
int ret; |
|
|
|
if (!cmd || !master) |
|
return -EINVAL; |
|
|
|
if (WARN_ON(master->init_done && |
|
!rwsem_is_locked(&master->bus.lock))) |
|
return -EINVAL; |
|
|
|
if (!master->ops->send_ccc_cmd) |
|
return -ENOTSUPP; |
|
|
|
if ((cmd->id & I3C_CCC_DIRECT) && (!cmd->dests || !cmd->ndests)) |
|
return -EINVAL; |
|
|
|
if (master->ops->supports_ccc_cmd && |
|
!master->ops->supports_ccc_cmd(master, cmd)) |
|
return -ENOTSUPP; |
|
|
|
ret = master->ops->send_ccc_cmd(master, cmd); |
|
if (ret) { |
|
if (cmd->err != I3C_ERROR_UNKNOWN) |
|
return cmd->err; |
|
|
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct i2c_dev_desc * |
|
i3c_master_find_i2c_dev_by_addr(const struct i3c_master_controller *master, |
|
u16 addr) |
|
{ |
|
struct i2c_dev_desc *dev; |
|
|
|
i3c_bus_for_each_i2cdev(&master->bus, dev) { |
|
if (dev->boardinfo->base.addr == addr) |
|
return dev; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
/** |
|
* i3c_master_get_free_addr() - get a free address on the bus |
|
* @master: I3C master object |
|
* @start_addr: where to start searching |
|
* |
|
* This function must be called with the bus lock held in write mode. |
|
* |
|
* Return: the first free address starting at @start_addr (included) or -ENOMEM |
|
* if there's no more address available. |
|
*/ |
|
int i3c_master_get_free_addr(struct i3c_master_controller *master, |
|
u8 start_addr) |
|
{ |
|
return i3c_bus_get_free_addr(&master->bus, start_addr); |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_get_free_addr); |
|
|
|
static void i3c_device_release(struct device *dev) |
|
{ |
|
struct i3c_device *i3cdev = dev_to_i3cdev(dev); |
|
|
|
WARN_ON(i3cdev->desc); |
|
|
|
of_node_put(i3cdev->dev.of_node); |
|
kfree(i3cdev); |
|
} |
|
|
|
static void i3c_master_free_i3c_dev(struct i3c_dev_desc *dev) |
|
{ |
|
kfree(dev); |
|
} |
|
|
|
static struct i3c_dev_desc * |
|
i3c_master_alloc_i3c_dev(struct i3c_master_controller *master, |
|
const struct i3c_device_info *info) |
|
{ |
|
struct i3c_dev_desc *dev; |
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
|
if (!dev) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
dev->common.master = master; |
|
dev->info = *info; |
|
mutex_init(&dev->ibi_lock); |
|
|
|
return dev; |
|
} |
|
|
|
static int i3c_master_rstdaa_locked(struct i3c_master_controller *master, |
|
u8 addr) |
|
{ |
|
enum i3c_addr_slot_status addrstat; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
if (!master) |
|
return -EINVAL; |
|
|
|
addrstat = i3c_bus_get_addr_slot_status(&master->bus, addr); |
|
if (addr != I3C_BROADCAST_ADDR && addrstat != I3C_ADDR_SLOT_I3C_DEV) |
|
return -EINVAL; |
|
|
|
i3c_ccc_cmd_dest_init(&dest, addr, 0); |
|
i3c_ccc_cmd_init(&cmd, false, |
|
I3C_CCC_RSTDAA(addr == I3C_BROADCAST_ADDR), |
|
&dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* i3c_master_entdaa_locked() - start a DAA (Dynamic Address Assignment) |
|
* procedure |
|
* @master: master used to send frames on the bus |
|
* |
|
* Send a ENTDAA CCC command to start a DAA procedure. |
|
* |
|
* Note that this function only sends the ENTDAA CCC command, all the logic |
|
* behind dynamic address assignment has to be handled in the I3C master |
|
* driver. |
|
* |
|
* This function must be called with the bus lock held in write mode. |
|
* |
|
* Return: 0 in case of success, a positive I3C error code if the error is |
|
* one of the official Mx error codes, and a negative error code otherwise. |
|
*/ |
|
int i3c_master_entdaa_locked(struct i3c_master_controller *master) |
|
{ |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR, 0); |
|
i3c_ccc_cmd_init(&cmd, false, I3C_CCC_ENTDAA, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_entdaa_locked); |
|
|
|
static int i3c_master_enec_disec_locked(struct i3c_master_controller *master, |
|
u8 addr, bool enable, u8 evts) |
|
{ |
|
struct i3c_ccc_events *events; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
events = i3c_ccc_cmd_dest_init(&dest, addr, sizeof(*events)); |
|
if (!events) |
|
return -ENOMEM; |
|
|
|
events->events = evts; |
|
i3c_ccc_cmd_init(&cmd, false, |
|
enable ? |
|
I3C_CCC_ENEC(addr == I3C_BROADCAST_ADDR) : |
|
I3C_CCC_DISEC(addr == I3C_BROADCAST_ADDR), |
|
&dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* i3c_master_disec_locked() - send a DISEC CCC command |
|
* @master: master used to send frames on the bus |
|
* @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR |
|
* @evts: events to disable |
|
* |
|
* Send a DISEC CCC command to disable some or all events coming from a |
|
* specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR. |
|
* |
|
* This function must be called with the bus lock held in write mode. |
|
* |
|
* Return: 0 in case of success, a positive I3C error code if the error is |
|
* one of the official Mx error codes, and a negative error code otherwise. |
|
*/ |
|
int i3c_master_disec_locked(struct i3c_master_controller *master, u8 addr, |
|
u8 evts) |
|
{ |
|
return i3c_master_enec_disec_locked(master, addr, false, evts); |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_disec_locked); |
|
|
|
/** |
|
* i3c_master_enec_locked() - send an ENEC CCC command |
|
* @master: master used to send frames on the bus |
|
* @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR |
|
* @evts: events to disable |
|
* |
|
* Sends an ENEC CCC command to enable some or all events coming from a |
|
* specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR. |
|
* |
|
* This function must be called with the bus lock held in write mode. |
|
* |
|
* Return: 0 in case of success, a positive I3C error code if the error is |
|
* one of the official Mx error codes, and a negative error code otherwise. |
|
*/ |
|
int i3c_master_enec_locked(struct i3c_master_controller *master, u8 addr, |
|
u8 evts) |
|
{ |
|
return i3c_master_enec_disec_locked(master, addr, true, evts); |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_enec_locked); |
|
|
|
/** |
|
* i3c_master_defslvs_locked() - send a DEFSLVS CCC command |
|
* @master: master used to send frames on the bus |
|
* |
|
* Send a DEFSLVS CCC command containing all the devices known to the @master. |
|
* This is useful when you have secondary masters on the bus to propagate |
|
* device information. |
|
* |
|
* This should be called after all I3C devices have been discovered (in other |
|
* words, after the DAA procedure has finished) and instantiated in |
|
* &i3c_master_controller_ops->bus_init(). |
|
* It should also be called if a master ACKed an Hot-Join request and assigned |
|
* a dynamic address to the device joining the bus. |
|
* |
|
* This function must be called with the bus lock held in write mode. |
|
* |
|
* Return: 0 in case of success, a positive I3C error code if the error is |
|
* one of the official Mx error codes, and a negative error code otherwise. |
|
*/ |
|
int i3c_master_defslvs_locked(struct i3c_master_controller *master) |
|
{ |
|
struct i3c_ccc_defslvs *defslvs; |
|
struct i3c_ccc_dev_desc *desc; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_dev_desc *i3cdev; |
|
struct i2c_dev_desc *i2cdev; |
|
struct i3c_ccc_cmd cmd; |
|
struct i3c_bus *bus; |
|
bool send = false; |
|
int ndevs = 0, ret; |
|
|
|
if (!master) |
|
return -EINVAL; |
|
|
|
bus = i3c_master_get_bus(master); |
|
i3c_bus_for_each_i3cdev(bus, i3cdev) { |
|
ndevs++; |
|
|
|
if (i3cdev == master->this) |
|
continue; |
|
|
|
if (I3C_BCR_DEVICE_ROLE(i3cdev->info.bcr) == |
|
I3C_BCR_I3C_MASTER) |
|
send = true; |
|
} |
|
|
|
/* No other master on the bus, skip DEFSLVS. */ |
|
if (!send) |
|
return 0; |
|
|
|
i3c_bus_for_each_i2cdev(bus, i2cdev) |
|
ndevs++; |
|
|
|
defslvs = i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR, |
|
struct_size(defslvs, slaves, |
|
ndevs - 1)); |
|
if (!defslvs) |
|
return -ENOMEM; |
|
|
|
defslvs->count = ndevs; |
|
defslvs->master.bcr = master->this->info.bcr; |
|
defslvs->master.dcr = master->this->info.dcr; |
|
defslvs->master.dyn_addr = master->this->info.dyn_addr << 1; |
|
defslvs->master.static_addr = I3C_BROADCAST_ADDR << 1; |
|
|
|
desc = defslvs->slaves; |
|
i3c_bus_for_each_i2cdev(bus, i2cdev) { |
|
desc->lvr = i2cdev->lvr; |
|
desc->static_addr = i2cdev->addr << 1; |
|
desc++; |
|
} |
|
|
|
i3c_bus_for_each_i3cdev(bus, i3cdev) { |
|
/* Skip the I3C dev representing this master. */ |
|
if (i3cdev == master->this) |
|
continue; |
|
|
|
desc->bcr = i3cdev->info.bcr; |
|
desc->dcr = i3cdev->info.dcr; |
|
desc->dyn_addr = i3cdev->info.dyn_addr << 1; |
|
desc->static_addr = i3cdev->info.static_addr << 1; |
|
desc++; |
|
} |
|
|
|
i3c_ccc_cmd_init(&cmd, false, I3C_CCC_DEFSLVS, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_defslvs_locked); |
|
|
|
static int i3c_master_setda_locked(struct i3c_master_controller *master, |
|
u8 oldaddr, u8 newaddr, bool setdasa) |
|
{ |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_setda *setda; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
if (!oldaddr || !newaddr) |
|
return -EINVAL; |
|
|
|
setda = i3c_ccc_cmd_dest_init(&dest, oldaddr, sizeof(*setda)); |
|
if (!setda) |
|
return -ENOMEM; |
|
|
|
setda->addr = newaddr << 1; |
|
i3c_ccc_cmd_init(&cmd, false, |
|
setdasa ? I3C_CCC_SETDASA : I3C_CCC_SETNEWDA, |
|
&dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_setdasa_locked(struct i3c_master_controller *master, |
|
u8 static_addr, u8 dyn_addr) |
|
{ |
|
return i3c_master_setda_locked(master, static_addr, dyn_addr, true); |
|
} |
|
|
|
static int i3c_master_setnewda_locked(struct i3c_master_controller *master, |
|
u8 oldaddr, u8 newaddr) |
|
{ |
|
return i3c_master_setda_locked(master, oldaddr, newaddr, false); |
|
} |
|
|
|
static int i3c_master_getmrl_locked(struct i3c_master_controller *master, |
|
struct i3c_device_info *info) |
|
{ |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_mrl *mrl; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
mrl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mrl)); |
|
if (!mrl) |
|
return -ENOMEM; |
|
|
|
/* |
|
* When the device does not have IBI payload GETMRL only returns 2 |
|
* bytes of data. |
|
*/ |
|
if (!(info->bcr & I3C_BCR_IBI_PAYLOAD)) |
|
dest.payload.len -= 1; |
|
|
|
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMRL, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
if (ret) |
|
goto out; |
|
|
|
switch (dest.payload.len) { |
|
case 3: |
|
info->max_ibi_len = mrl->ibi_len; |
|
fallthrough; |
|
case 2: |
|
info->max_read_len = be16_to_cpu(mrl->read_len); |
|
break; |
|
default: |
|
ret = -EIO; |
|
goto out; |
|
} |
|
|
|
out: |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_getmwl_locked(struct i3c_master_controller *master, |
|
struct i3c_device_info *info) |
|
{ |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_mwl *mwl; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
mwl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mwl)); |
|
if (!mwl) |
|
return -ENOMEM; |
|
|
|
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMWL, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
if (ret) |
|
goto out; |
|
|
|
if (dest.payload.len != sizeof(*mwl)) { |
|
ret = -EIO; |
|
goto out; |
|
} |
|
|
|
info->max_write_len = be16_to_cpu(mwl->len); |
|
|
|
out: |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_getmxds_locked(struct i3c_master_controller *master, |
|
struct i3c_device_info *info) |
|
{ |
|
struct i3c_ccc_getmxds *getmaxds; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
getmaxds = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, |
|
sizeof(*getmaxds)); |
|
if (!getmaxds) |
|
return -ENOMEM; |
|
|
|
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMXDS, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
if (ret) |
|
goto out; |
|
|
|
if (dest.payload.len != 2 && dest.payload.len != 5) { |
|
ret = -EIO; |
|
goto out; |
|
} |
|
|
|
info->max_read_ds = getmaxds->maxrd; |
|
info->max_write_ds = getmaxds->maxwr; |
|
if (dest.payload.len == 5) |
|
info->max_read_turnaround = getmaxds->maxrdturn[0] | |
|
((u32)getmaxds->maxrdturn[1] << 8) | |
|
((u32)getmaxds->maxrdturn[2] << 16); |
|
|
|
out: |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_gethdrcap_locked(struct i3c_master_controller *master, |
|
struct i3c_device_info *info) |
|
{ |
|
struct i3c_ccc_gethdrcap *gethdrcap; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
gethdrcap = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, |
|
sizeof(*gethdrcap)); |
|
if (!gethdrcap) |
|
return -ENOMEM; |
|
|
|
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETHDRCAP, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
if (ret) |
|
goto out; |
|
|
|
if (dest.payload.len != 1) { |
|
ret = -EIO; |
|
goto out; |
|
} |
|
|
|
info->hdr_cap = gethdrcap->modes; |
|
|
|
out: |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_getpid_locked(struct i3c_master_controller *master, |
|
struct i3c_device_info *info) |
|
{ |
|
struct i3c_ccc_getpid *getpid; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret, i; |
|
|
|
getpid = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getpid)); |
|
if (!getpid) |
|
return -ENOMEM; |
|
|
|
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETPID, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
if (ret) |
|
goto out; |
|
|
|
info->pid = 0; |
|
for (i = 0; i < sizeof(getpid->pid); i++) { |
|
int sft = (sizeof(getpid->pid) - i - 1) * 8; |
|
|
|
info->pid |= (u64)getpid->pid[i] << sft; |
|
} |
|
|
|
out: |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_getbcr_locked(struct i3c_master_controller *master, |
|
struct i3c_device_info *info) |
|
{ |
|
struct i3c_ccc_getbcr *getbcr; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
getbcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getbcr)); |
|
if (!getbcr) |
|
return -ENOMEM; |
|
|
|
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETBCR, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
if (ret) |
|
goto out; |
|
|
|
info->bcr = getbcr->bcr; |
|
|
|
out: |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_getdcr_locked(struct i3c_master_controller *master, |
|
struct i3c_device_info *info) |
|
{ |
|
struct i3c_ccc_getdcr *getdcr; |
|
struct i3c_ccc_cmd_dest dest; |
|
struct i3c_ccc_cmd cmd; |
|
int ret; |
|
|
|
getdcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getdcr)); |
|
if (!getdcr) |
|
return -ENOMEM; |
|
|
|
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETDCR, &dest, 1); |
|
ret = i3c_master_send_ccc_cmd_locked(master, &cmd); |
|
if (ret) |
|
goto out; |
|
|
|
info->dcr = getdcr->dcr; |
|
|
|
out: |
|
i3c_ccc_cmd_dest_cleanup(&dest); |
|
|
|
return ret; |
|
} |
|
|
|
static int i3c_master_retrieve_dev_info(struct i3c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
enum i3c_addr_slot_status slot_status; |
|
int ret; |
|
|
|
if (!dev->info.dyn_addr) |
|
return -EINVAL; |
|
|
|
slot_status = i3c_bus_get_addr_slot_status(&master->bus, |
|
dev->info.dyn_addr); |
|
if (slot_status == I3C_ADDR_SLOT_RSVD || |
|
slot_status == I3C_ADDR_SLOT_I2C_DEV) |
|
return -EINVAL; |
|
|
|
ret = i3c_master_getpid_locked(master, &dev->info); |
|
if (ret) |
|
return ret; |
|
|
|
ret = i3c_master_getbcr_locked(master, &dev->info); |
|
if (ret) |
|
return ret; |
|
|
|
ret = i3c_master_getdcr_locked(master, &dev->info); |
|
if (ret) |
|
return ret; |
|
|
|
if (dev->info.bcr & I3C_BCR_MAX_DATA_SPEED_LIM) { |
|
ret = i3c_master_getmxds_locked(master, &dev->info); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
if (dev->info.bcr & I3C_BCR_IBI_PAYLOAD) |
|
dev->info.max_ibi_len = 1; |
|
|
|
i3c_master_getmrl_locked(master, &dev->info); |
|
i3c_master_getmwl_locked(master, &dev->info); |
|
|
|
if (dev->info.bcr & I3C_BCR_HDR_CAP) { |
|
ret = i3c_master_gethdrcap_locked(master, &dev->info); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void i3c_master_put_i3c_addrs(struct i3c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
|
|
if (dev->info.static_addr) |
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
dev->info.static_addr, |
|
I3C_ADDR_SLOT_FREE); |
|
|
|
if (dev->info.dyn_addr) |
|
i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, |
|
I3C_ADDR_SLOT_FREE); |
|
|
|
if (dev->boardinfo && dev->boardinfo->init_dyn_addr) |
|
i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, |
|
I3C_ADDR_SLOT_FREE); |
|
} |
|
|
|
static int i3c_master_get_i3c_addrs(struct i3c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
enum i3c_addr_slot_status status; |
|
|
|
if (!dev->info.static_addr && !dev->info.dyn_addr) |
|
return 0; |
|
|
|
if (dev->info.static_addr) { |
|
status = i3c_bus_get_addr_slot_status(&master->bus, |
|
dev->info.static_addr); |
|
if (status != I3C_ADDR_SLOT_FREE) |
|
return -EBUSY; |
|
|
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
dev->info.static_addr, |
|
I3C_ADDR_SLOT_I3C_DEV); |
|
} |
|
|
|
/* |
|
* ->init_dyn_addr should have been reserved before that, so, if we're |
|
* trying to apply a pre-reserved dynamic address, we should not try |
|
* to reserve the address slot a second time. |
|
*/ |
|
if (dev->info.dyn_addr && |
|
(!dev->boardinfo || |
|
dev->boardinfo->init_dyn_addr != dev->info.dyn_addr)) { |
|
status = i3c_bus_get_addr_slot_status(&master->bus, |
|
dev->info.dyn_addr); |
|
if (status != I3C_ADDR_SLOT_FREE) |
|
goto err_release_static_addr; |
|
|
|
i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, |
|
I3C_ADDR_SLOT_I3C_DEV); |
|
} |
|
|
|
return 0; |
|
|
|
err_release_static_addr: |
|
if (dev->info.static_addr) |
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
dev->info.static_addr, |
|
I3C_ADDR_SLOT_FREE); |
|
|
|
return -EBUSY; |
|
} |
|
|
|
static int i3c_master_attach_i3c_dev(struct i3c_master_controller *master, |
|
struct i3c_dev_desc *dev) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* We don't attach devices to the controller until they are |
|
* addressable on the bus. |
|
*/ |
|
if (!dev->info.static_addr && !dev->info.dyn_addr) |
|
return 0; |
|
|
|
ret = i3c_master_get_i3c_addrs(dev); |
|
if (ret) |
|
return ret; |
|
|
|
/* Do not attach the master device itself. */ |
|
if (master->this != dev && master->ops->attach_i3c_dev) { |
|
ret = master->ops->attach_i3c_dev(dev); |
|
if (ret) { |
|
i3c_master_put_i3c_addrs(dev); |
|
return ret; |
|
} |
|
} |
|
|
|
list_add_tail(&dev->common.node, &master->bus.devs.i3c); |
|
|
|
return 0; |
|
} |
|
|
|
static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, |
|
u8 old_dyn_addr) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
enum i3c_addr_slot_status status; |
|
int ret; |
|
|
|
if (dev->info.dyn_addr != old_dyn_addr && |
|
(!dev->boardinfo || |
|
dev->info.dyn_addr != dev->boardinfo->init_dyn_addr)) { |
|
status = i3c_bus_get_addr_slot_status(&master->bus, |
|
dev->info.dyn_addr); |
|
if (status != I3C_ADDR_SLOT_FREE) |
|
return -EBUSY; |
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
dev->info.dyn_addr, |
|
I3C_ADDR_SLOT_I3C_DEV); |
|
} |
|
|
|
if (master->ops->reattach_i3c_dev) { |
|
ret = master->ops->reattach_i3c_dev(dev, old_dyn_addr); |
|
if (ret) { |
|
i3c_master_put_i3c_addrs(dev); |
|
return ret; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
|
|
/* Do not detach the master device itself. */ |
|
if (master->this != dev && master->ops->detach_i3c_dev) |
|
master->ops->detach_i3c_dev(dev); |
|
|
|
i3c_master_put_i3c_addrs(dev); |
|
list_del(&dev->common.node); |
|
} |
|
|
|
static int i3c_master_attach_i2c_dev(struct i3c_master_controller *master, |
|
struct i2c_dev_desc *dev) |
|
{ |
|
int ret; |
|
|
|
if (master->ops->attach_i2c_dev) { |
|
ret = master->ops->attach_i2c_dev(dev); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
list_add_tail(&dev->common.node, &master->bus.devs.i2c); |
|
|
|
return 0; |
|
} |
|
|
|
static void i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master = i2c_dev_get_master(dev); |
|
|
|
list_del(&dev->common.node); |
|
|
|
if (master->ops->detach_i2c_dev) |
|
master->ops->detach_i2c_dev(dev); |
|
} |
|
|
|
static int i3c_master_early_i3c_dev_add(struct i3c_master_controller *master, |
|
struct i3c_dev_boardinfo *boardinfo) |
|
{ |
|
struct i3c_device_info info = { |
|
.static_addr = boardinfo->static_addr, |
|
}; |
|
struct i3c_dev_desc *i3cdev; |
|
int ret; |
|
|
|
i3cdev = i3c_master_alloc_i3c_dev(master, &info); |
|
if (IS_ERR(i3cdev)) |
|
return -ENOMEM; |
|
|
|
i3cdev->boardinfo = boardinfo; |
|
|
|
ret = i3c_master_attach_i3c_dev(master, i3cdev); |
|
if (ret) |
|
goto err_free_dev; |
|
|
|
ret = i3c_master_setdasa_locked(master, i3cdev->info.static_addr, |
|
i3cdev->boardinfo->init_dyn_addr); |
|
if (ret) |
|
goto err_detach_dev; |
|
|
|
i3cdev->info.dyn_addr = i3cdev->boardinfo->init_dyn_addr; |
|
ret = i3c_master_reattach_i3c_dev(i3cdev, 0); |
|
if (ret) |
|
goto err_rstdaa; |
|
|
|
ret = i3c_master_retrieve_dev_info(i3cdev); |
|
if (ret) |
|
goto err_rstdaa; |
|
|
|
return 0; |
|
|
|
err_rstdaa: |
|
i3c_master_rstdaa_locked(master, i3cdev->boardinfo->init_dyn_addr); |
|
err_detach_dev: |
|
i3c_master_detach_i3c_dev(i3cdev); |
|
err_free_dev: |
|
i3c_master_free_i3c_dev(i3cdev); |
|
|
|
return ret; |
|
} |
|
|
|
static void |
|
i3c_master_register_new_i3c_devs(struct i3c_master_controller *master) |
|
{ |
|
struct i3c_dev_desc *desc; |
|
int ret; |
|
|
|
if (!master->init_done) |
|
return; |
|
|
|
i3c_bus_for_each_i3cdev(&master->bus, desc) { |
|
if (desc->dev || !desc->info.dyn_addr || desc == master->this) |
|
continue; |
|
|
|
desc->dev = kzalloc(sizeof(*desc->dev), GFP_KERNEL); |
|
if (!desc->dev) |
|
continue; |
|
|
|
desc->dev->bus = &master->bus; |
|
desc->dev->desc = desc; |
|
desc->dev->dev.parent = &master->dev; |
|
desc->dev->dev.type = &i3c_device_type; |
|
desc->dev->dev.bus = &i3c_bus_type; |
|
desc->dev->dev.release = i3c_device_release; |
|
dev_set_name(&desc->dev->dev, "%d-%llx", master->bus.id, |
|
desc->info.pid); |
|
|
|
if (desc->boardinfo) |
|
desc->dev->dev.of_node = desc->boardinfo->of_node; |
|
|
|
ret = device_register(&desc->dev->dev); |
|
if (ret) |
|
dev_err(&master->dev, |
|
"Failed to add I3C device (err = %d)\n", ret); |
|
} |
|
} |
|
|
|
/** |
|
* i3c_master_do_daa() - do a DAA (Dynamic Address Assignment) |
|
* @master: master doing the DAA |
|
* |
|
* This function is instantiating an I3C device object and adding it to the |
|
* I3C device list. All device information are automatically retrieved using |
|
* standard CCC commands. |
|
* |
|
* The I3C device object is returned in case the master wants to attach |
|
* private data to it using i3c_dev_set_master_data(). |
|
* |
|
* This function must be called with the bus lock held in write mode. |
|
* |
|
* Return: a 0 in case of success, an negative error code otherwise. |
|
*/ |
|
int i3c_master_do_daa(struct i3c_master_controller *master) |
|
{ |
|
int ret; |
|
|
|
i3c_bus_maintenance_lock(&master->bus); |
|
ret = master->ops->do_daa(master); |
|
i3c_bus_maintenance_unlock(&master->bus); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
i3c_bus_normaluse_lock(&master->bus); |
|
i3c_master_register_new_i3c_devs(master); |
|
i3c_bus_normaluse_unlock(&master->bus); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_do_daa); |
|
|
|
/** |
|
* i3c_master_set_info() - set master device information |
|
* @master: master used to send frames on the bus |
|
* @info: I3C device information |
|
* |
|
* Set master device info. This should be called from |
|
* &i3c_master_controller_ops->bus_init(). |
|
* |
|
* Not all &i3c_device_info fields are meaningful for a master device. |
|
* Here is a list of fields that should be properly filled: |
|
* |
|
* - &i3c_device_info->dyn_addr |
|
* - &i3c_device_info->bcr |
|
* - &i3c_device_info->dcr |
|
* - &i3c_device_info->pid |
|
* - &i3c_device_info->hdr_cap if %I3C_BCR_HDR_CAP bit is set in |
|
* &i3c_device_info->bcr |
|
* |
|
* This function must be called with the bus lock held in maintenance mode. |
|
* |
|
* Return: 0 if @info contains valid information (not every piece of |
|
* information can be checked, but we can at least make sure @info->dyn_addr |
|
* and @info->bcr are correct), -EINVAL otherwise. |
|
*/ |
|
int i3c_master_set_info(struct i3c_master_controller *master, |
|
const struct i3c_device_info *info) |
|
{ |
|
struct i3c_dev_desc *i3cdev; |
|
int ret; |
|
|
|
if (!i3c_bus_dev_addr_is_avail(&master->bus, info->dyn_addr)) |
|
return -EINVAL; |
|
|
|
if (I3C_BCR_DEVICE_ROLE(info->bcr) == I3C_BCR_I3C_MASTER && |
|
master->secondary) |
|
return -EINVAL; |
|
|
|
if (master->this) |
|
return -EINVAL; |
|
|
|
i3cdev = i3c_master_alloc_i3c_dev(master, info); |
|
if (IS_ERR(i3cdev)) |
|
return PTR_ERR(i3cdev); |
|
|
|
master->this = i3cdev; |
|
master->bus.cur_master = master->this; |
|
|
|
ret = i3c_master_attach_i3c_dev(master, i3cdev); |
|
if (ret) |
|
goto err_free_dev; |
|
|
|
return 0; |
|
|
|
err_free_dev: |
|
i3c_master_free_i3c_dev(i3cdev); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_set_info); |
|
|
|
static void i3c_master_detach_free_devs(struct i3c_master_controller *master) |
|
{ |
|
struct i3c_dev_desc *i3cdev, *i3ctmp; |
|
struct i2c_dev_desc *i2cdev, *i2ctmp; |
|
|
|
list_for_each_entry_safe(i3cdev, i3ctmp, &master->bus.devs.i3c, |
|
common.node) { |
|
i3c_master_detach_i3c_dev(i3cdev); |
|
|
|
if (i3cdev->boardinfo && i3cdev->boardinfo->init_dyn_addr) |
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
i3cdev->boardinfo->init_dyn_addr, |
|
I3C_ADDR_SLOT_FREE); |
|
|
|
i3c_master_free_i3c_dev(i3cdev); |
|
} |
|
|
|
list_for_each_entry_safe(i2cdev, i2ctmp, &master->bus.devs.i2c, |
|
common.node) { |
|
i3c_master_detach_i2c_dev(i2cdev); |
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
i2cdev->addr, |
|
I3C_ADDR_SLOT_FREE); |
|
i3c_master_free_i2c_dev(i2cdev); |
|
} |
|
} |
|
|
|
/** |
|
* i3c_master_bus_init() - initialize an I3C bus |
|
* @master: main master initializing the bus |
|
* |
|
* This function is following all initialisation steps described in the I3C |
|
* specification: |
|
* |
|
* 1. Attach I2C devs to the master so that the master can fill its internal |
|
* device table appropriately |
|
* |
|
* 2. Call &i3c_master_controller_ops->bus_init() method to initialize |
|
* the master controller. That's usually where the bus mode is selected |
|
* (pure bus or mixed fast/slow bus) |
|
* |
|
* 3. Instruct all devices on the bus to drop their dynamic address. This is |
|
* particularly important when the bus was previously configured by someone |
|
* else (for example the bootloader) |
|
* |
|
* 4. Disable all slave events. |
|
* |
|
* 5. Reserve address slots for I3C devices with init_dyn_addr. And if devices |
|
* also have static_addr, try to pre-assign dynamic addresses requested by |
|
* the FW with SETDASA and attach corresponding statically defined I3C |
|
* devices to the master. |
|
* |
|
* 6. Do a DAA (Dynamic Address Assignment) to assign dynamic addresses to all |
|
* remaining I3C devices |
|
* |
|
* Once this is done, all I3C and I2C devices should be usable. |
|
* |
|
* Return: a 0 in case of success, an negative error code otherwise. |
|
*/ |
|
static int i3c_master_bus_init(struct i3c_master_controller *master) |
|
{ |
|
enum i3c_addr_slot_status status; |
|
struct i2c_dev_boardinfo *i2cboardinfo; |
|
struct i3c_dev_boardinfo *i3cboardinfo; |
|
struct i2c_dev_desc *i2cdev; |
|
int ret; |
|
|
|
/* |
|
* First attach all devices with static definitions provided by the |
|
* FW. |
|
*/ |
|
list_for_each_entry(i2cboardinfo, &master->boardinfo.i2c, node) { |
|
status = i3c_bus_get_addr_slot_status(&master->bus, |
|
i2cboardinfo->base.addr); |
|
if (status != I3C_ADDR_SLOT_FREE) { |
|
ret = -EBUSY; |
|
goto err_detach_devs; |
|
} |
|
|
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
i2cboardinfo->base.addr, |
|
I3C_ADDR_SLOT_I2C_DEV); |
|
|
|
i2cdev = i3c_master_alloc_i2c_dev(master, i2cboardinfo); |
|
if (IS_ERR(i2cdev)) { |
|
ret = PTR_ERR(i2cdev); |
|
goto err_detach_devs; |
|
} |
|
|
|
ret = i3c_master_attach_i2c_dev(master, i2cdev); |
|
if (ret) { |
|
i3c_master_free_i2c_dev(i2cdev); |
|
goto err_detach_devs; |
|
} |
|
} |
|
|
|
/* |
|
* Now execute the controller specific ->bus_init() routine, which |
|
* might configure its internal logic to match the bus limitations. |
|
*/ |
|
ret = master->ops->bus_init(master); |
|
if (ret) |
|
goto err_detach_devs; |
|
|
|
/* |
|
* The master device should have been instantiated in ->bus_init(), |
|
* complain if this was not the case. |
|
*/ |
|
if (!master->this) { |
|
dev_err(&master->dev, |
|
"master_set_info() was not called in ->bus_init()\n"); |
|
ret = -EINVAL; |
|
goto err_bus_cleanup; |
|
} |
|
|
|
/* |
|
* Reset all dynamic address that may have been assigned before |
|
* (assigned by the bootloader for example). |
|
*/ |
|
ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); |
|
if (ret && ret != I3C_ERROR_M2) |
|
goto err_bus_cleanup; |
|
|
|
/* Disable all slave events before starting DAA. */ |
|
ret = i3c_master_disec_locked(master, I3C_BROADCAST_ADDR, |
|
I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR | |
|
I3C_CCC_EVENT_HJ); |
|
if (ret && ret != I3C_ERROR_M2) |
|
goto err_bus_cleanup; |
|
|
|
/* |
|
* Reserve init_dyn_addr first, and then try to pre-assign dynamic |
|
* address and retrieve device information if needed. |
|
* In case pre-assign dynamic address fails, setting dynamic address to |
|
* the requested init_dyn_addr is retried after DAA is done in |
|
* i3c_master_add_i3c_dev_locked(). |
|
*/ |
|
list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) { |
|
|
|
/* |
|
* We don't reserve a dynamic address for devices that |
|
* don't explicitly request one. |
|
*/ |
|
if (!i3cboardinfo->init_dyn_addr) |
|
continue; |
|
|
|
ret = i3c_bus_get_addr_slot_status(&master->bus, |
|
i3cboardinfo->init_dyn_addr); |
|
if (ret != I3C_ADDR_SLOT_FREE) { |
|
ret = -EBUSY; |
|
goto err_rstdaa; |
|
} |
|
|
|
i3c_bus_set_addr_slot_status(&master->bus, |
|
i3cboardinfo->init_dyn_addr, |
|
I3C_ADDR_SLOT_I3C_DEV); |
|
|
|
/* |
|
* Only try to create/attach devices that have a static |
|
* address. Other devices will be created/attached when |
|
* DAA happens, and the requested dynamic address will |
|
* be set using SETNEWDA once those devices become |
|
* addressable. |
|
*/ |
|
|
|
if (i3cboardinfo->static_addr) |
|
i3c_master_early_i3c_dev_add(master, i3cboardinfo); |
|
} |
|
|
|
ret = i3c_master_do_daa(master); |
|
if (ret) |
|
goto err_rstdaa; |
|
|
|
return 0; |
|
|
|
err_rstdaa: |
|
i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); |
|
|
|
err_bus_cleanup: |
|
if (master->ops->bus_cleanup) |
|
master->ops->bus_cleanup(master); |
|
|
|
err_detach_devs: |
|
i3c_master_detach_free_devs(master); |
|
|
|
return ret; |
|
} |
|
|
|
static void i3c_master_bus_cleanup(struct i3c_master_controller *master) |
|
{ |
|
if (master->ops->bus_cleanup) |
|
master->ops->bus_cleanup(master); |
|
|
|
i3c_master_detach_free_devs(master); |
|
} |
|
|
|
static void i3c_master_attach_boardinfo(struct i3c_dev_desc *i3cdev) |
|
{ |
|
struct i3c_master_controller *master = i3cdev->common.master; |
|
struct i3c_dev_boardinfo *i3cboardinfo; |
|
|
|
list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) { |
|
if (i3cdev->info.pid != i3cboardinfo->pid) |
|
continue; |
|
|
|
i3cdev->boardinfo = i3cboardinfo; |
|
i3cdev->info.static_addr = i3cboardinfo->static_addr; |
|
return; |
|
} |
|
} |
|
|
|
static struct i3c_dev_desc * |
|
i3c_master_search_i3c_dev_duplicate(struct i3c_dev_desc *refdev) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(refdev); |
|
struct i3c_dev_desc *i3cdev; |
|
|
|
i3c_bus_for_each_i3cdev(&master->bus, i3cdev) { |
|
if (i3cdev != refdev && i3cdev->info.pid == refdev->info.pid) |
|
return i3cdev; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
/** |
|
* i3c_master_add_i3c_dev_locked() - add an I3C slave to the bus |
|
* @master: master used to send frames on the bus |
|
* @addr: I3C slave dynamic address assigned to the device |
|
* |
|
* This function is instantiating an I3C device object and adding it to the |
|
* I3C device list. All device information are automatically retrieved using |
|
* standard CCC commands. |
|
* |
|
* The I3C device object is returned in case the master wants to attach |
|
* private data to it using i3c_dev_set_master_data(). |
|
* |
|
* This function must be called with the bus lock held in write mode. |
|
* |
|
* Return: a 0 in case of success, an negative error code otherwise. |
|
*/ |
|
int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master, |
|
u8 addr) |
|
{ |
|
struct i3c_device_info info = { .dyn_addr = addr }; |
|
struct i3c_dev_desc *newdev, *olddev; |
|
u8 old_dyn_addr = addr, expected_dyn_addr; |
|
struct i3c_ibi_setup ibireq = { }; |
|
bool enable_ibi = false; |
|
int ret; |
|
|
|
if (!master) |
|
return -EINVAL; |
|
|
|
newdev = i3c_master_alloc_i3c_dev(master, &info); |
|
if (IS_ERR(newdev)) |
|
return PTR_ERR(newdev); |
|
|
|
ret = i3c_master_attach_i3c_dev(master, newdev); |
|
if (ret) |
|
goto err_free_dev; |
|
|
|
ret = i3c_master_retrieve_dev_info(newdev); |
|
if (ret) |
|
goto err_detach_dev; |
|
|
|
i3c_master_attach_boardinfo(newdev); |
|
|
|
olddev = i3c_master_search_i3c_dev_duplicate(newdev); |
|
if (olddev) { |
|
newdev->dev = olddev->dev; |
|
if (newdev->dev) |
|
newdev->dev->desc = newdev; |
|
|
|
/* |
|
* We need to restore the IBI state too, so let's save the |
|
* IBI information and try to restore them after olddev has |
|
* been detached+released and its IBI has been stopped and |
|
* the associated resources have been freed. |
|
*/ |
|
mutex_lock(&olddev->ibi_lock); |
|
if (olddev->ibi) { |
|
ibireq.handler = olddev->ibi->handler; |
|
ibireq.max_payload_len = olddev->ibi->max_payload_len; |
|
ibireq.num_slots = olddev->ibi->num_slots; |
|
|
|
if (olddev->ibi->enabled) { |
|
enable_ibi = true; |
|
i3c_dev_disable_ibi_locked(olddev); |
|
} |
|
|
|
i3c_dev_free_ibi_locked(olddev); |
|
} |
|
mutex_unlock(&olddev->ibi_lock); |
|
|
|
old_dyn_addr = olddev->info.dyn_addr; |
|
|
|
i3c_master_detach_i3c_dev(olddev); |
|
i3c_master_free_i3c_dev(olddev); |
|
} |
|
|
|
ret = i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); |
|
if (ret) |
|
goto err_detach_dev; |
|
|
|
/* |
|
* Depending on our previous state, the expected dynamic address might |
|
* differ: |
|
* - if the device already had a dynamic address assigned, let's try to |
|
* re-apply this one |
|
* - if the device did not have a dynamic address and the firmware |
|
* requested a specific address, pick this one |
|
* - in any other case, keep the address automatically assigned by the |
|
* master |
|
*/ |
|
if (old_dyn_addr && old_dyn_addr != newdev->info.dyn_addr) |
|
expected_dyn_addr = old_dyn_addr; |
|
else if (newdev->boardinfo && newdev->boardinfo->init_dyn_addr) |
|
expected_dyn_addr = newdev->boardinfo->init_dyn_addr; |
|
else |
|
expected_dyn_addr = newdev->info.dyn_addr; |
|
|
|
if (newdev->info.dyn_addr != expected_dyn_addr) { |
|
/* |
|
* Try to apply the expected dynamic address. If it fails, keep |
|
* the address assigned by the master. |
|
*/ |
|
ret = i3c_master_setnewda_locked(master, |
|
newdev->info.dyn_addr, |
|
expected_dyn_addr); |
|
if (!ret) { |
|
old_dyn_addr = newdev->info.dyn_addr; |
|
newdev->info.dyn_addr = expected_dyn_addr; |
|
i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); |
|
} else { |
|
dev_err(&master->dev, |
|
"Failed to assign reserved/old address to device %d%llx", |
|
master->bus.id, newdev->info.pid); |
|
} |
|
} |
|
|
|
/* |
|
* Now is time to try to restore the IBI setup. If we're lucky, |
|
* everything works as before, otherwise, all we can do is complain. |
|
* FIXME: maybe we should add callback to inform the driver that it |
|
* should request the IBI again instead of trying to hide that from |
|
* him. |
|
*/ |
|
if (ibireq.handler) { |
|
mutex_lock(&newdev->ibi_lock); |
|
ret = i3c_dev_request_ibi_locked(newdev, &ibireq); |
|
if (ret) { |
|
dev_err(&master->dev, |
|
"Failed to request IBI on device %d-%llx", |
|
master->bus.id, newdev->info.pid); |
|
} else if (enable_ibi) { |
|
ret = i3c_dev_enable_ibi_locked(newdev); |
|
if (ret) |
|
dev_err(&master->dev, |
|
"Failed to re-enable IBI on device %d-%llx", |
|
master->bus.id, newdev->info.pid); |
|
} |
|
mutex_unlock(&newdev->ibi_lock); |
|
} |
|
|
|
return 0; |
|
|
|
err_detach_dev: |
|
if (newdev->dev && newdev->dev->desc) |
|
newdev->dev->desc = NULL; |
|
|
|
i3c_master_detach_i3c_dev(newdev); |
|
|
|
err_free_dev: |
|
i3c_master_free_i3c_dev(newdev); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_add_i3c_dev_locked); |
|
|
|
#define OF_I3C_REG1_IS_I2C_DEV BIT(31) |
|
|
|
static int |
|
of_i3c_master_add_i2c_boardinfo(struct i3c_master_controller *master, |
|
struct device_node *node, u32 *reg) |
|
{ |
|
struct i2c_dev_boardinfo *boardinfo; |
|
struct device *dev = &master->dev; |
|
int ret; |
|
|
|
boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL); |
|
if (!boardinfo) |
|
return -ENOMEM; |
|
|
|
ret = of_i2c_get_board_info(dev, node, &boardinfo->base); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* The I3C Specification does not clearly say I2C devices with 10-bit |
|
* address are supported. These devices can't be passed properly through |
|
* DEFSLVS command. |
|
*/ |
|
if (boardinfo->base.flags & I2C_CLIENT_TEN) { |
|
dev_err(dev, "I2C device with 10 bit address not supported."); |
|
return -ENOTSUPP; |
|
} |
|
|
|
/* LVR is encoded in reg[2]. */ |
|
boardinfo->lvr = reg[2]; |
|
|
|
list_add_tail(&boardinfo->node, &master->boardinfo.i2c); |
|
of_node_get(node); |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
of_i3c_master_add_i3c_boardinfo(struct i3c_master_controller *master, |
|
struct device_node *node, u32 *reg) |
|
{ |
|
struct i3c_dev_boardinfo *boardinfo; |
|
struct device *dev = &master->dev; |
|
enum i3c_addr_slot_status addrstatus; |
|
u32 init_dyn_addr = 0; |
|
|
|
boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL); |
|
if (!boardinfo) |
|
return -ENOMEM; |
|
|
|
if (reg[0]) { |
|
if (reg[0] > I3C_MAX_ADDR) |
|
return -EINVAL; |
|
|
|
addrstatus = i3c_bus_get_addr_slot_status(&master->bus, |
|
reg[0]); |
|
if (addrstatus != I3C_ADDR_SLOT_FREE) |
|
return -EINVAL; |
|
} |
|
|
|
boardinfo->static_addr = reg[0]; |
|
|
|
if (!of_property_read_u32(node, "assigned-address", &init_dyn_addr)) { |
|
if (init_dyn_addr > I3C_MAX_ADDR) |
|
return -EINVAL; |
|
|
|
addrstatus = i3c_bus_get_addr_slot_status(&master->bus, |
|
init_dyn_addr); |
|
if (addrstatus != I3C_ADDR_SLOT_FREE) |
|
return -EINVAL; |
|
} |
|
|
|
boardinfo->pid = ((u64)reg[1] << 32) | reg[2]; |
|
|
|
if ((boardinfo->pid & GENMASK_ULL(63, 48)) || |
|
I3C_PID_RND_LOWER_32BITS(boardinfo->pid)) |
|
return -EINVAL; |
|
|
|
boardinfo->init_dyn_addr = init_dyn_addr; |
|
boardinfo->of_node = of_node_get(node); |
|
list_add_tail(&boardinfo->node, &master->boardinfo.i3c); |
|
|
|
return 0; |
|
} |
|
|
|
static int of_i3c_master_add_dev(struct i3c_master_controller *master, |
|
struct device_node *node) |
|
{ |
|
u32 reg[3]; |
|
int ret; |
|
|
|
if (!master || !node) |
|
return -EINVAL; |
|
|
|
ret = of_property_read_u32_array(node, "reg", reg, ARRAY_SIZE(reg)); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* The manufacturer ID can't be 0. If reg[1] == 0 that means we're |
|
* dealing with an I2C device. |
|
*/ |
|
if (!reg[1]) |
|
ret = of_i3c_master_add_i2c_boardinfo(master, node, reg); |
|
else |
|
ret = of_i3c_master_add_i3c_boardinfo(master, node, reg); |
|
|
|
return ret; |
|
} |
|
|
|
static int of_populate_i3c_bus(struct i3c_master_controller *master) |
|
{ |
|
struct device *dev = &master->dev; |
|
struct device_node *i3cbus_np = dev->of_node; |
|
struct device_node *node; |
|
int ret; |
|
u32 val; |
|
|
|
if (!i3cbus_np) |
|
return 0; |
|
|
|
for_each_available_child_of_node(i3cbus_np, node) { |
|
ret = of_i3c_master_add_dev(master, node); |
|
if (ret) { |
|
of_node_put(node); |
|
return ret; |
|
} |
|
} |
|
|
|
/* |
|
* The user might want to limit I2C and I3C speed in case some devices |
|
* on the bus are not supporting typical rates, or if the bus topology |
|
* prevents it from using max possible rate. |
|
*/ |
|
if (!of_property_read_u32(i3cbus_np, "i2c-scl-hz", &val)) |
|
master->bus.scl_rate.i2c = val; |
|
|
|
if (!of_property_read_u32(i3cbus_np, "i3c-scl-hz", &val)) |
|
master->bus.scl_rate.i3c = val; |
|
|
|
return 0; |
|
} |
|
|
|
static int i3c_master_i2c_adapter_xfer(struct i2c_adapter *adap, |
|
struct i2c_msg *xfers, int nxfers) |
|
{ |
|
struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap); |
|
struct i2c_dev_desc *dev; |
|
int i, ret; |
|
u16 addr; |
|
|
|
if (!xfers || !master || nxfers <= 0) |
|
return -EINVAL; |
|
|
|
if (!master->ops->i2c_xfers) |
|
return -ENOTSUPP; |
|
|
|
/* Doing transfers to different devices is not supported. */ |
|
addr = xfers[0].addr; |
|
for (i = 1; i < nxfers; i++) { |
|
if (addr != xfers[i].addr) |
|
return -ENOTSUPP; |
|
} |
|
|
|
i3c_bus_normaluse_lock(&master->bus); |
|
dev = i3c_master_find_i2c_dev_by_addr(master, addr); |
|
if (!dev) |
|
ret = -ENOENT; |
|
else |
|
ret = master->ops->i2c_xfers(dev, xfers, nxfers); |
|
i3c_bus_normaluse_unlock(&master->bus); |
|
|
|
return ret ? ret : nxfers; |
|
} |
|
|
|
static u32 i3c_master_i2c_funcs(struct i2c_adapter *adapter) |
|
{ |
|
return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; |
|
} |
|
|
|
static const struct i2c_algorithm i3c_master_i2c_algo = { |
|
.master_xfer = i3c_master_i2c_adapter_xfer, |
|
.functionality = i3c_master_i2c_funcs, |
|
}; |
|
|
|
static int i3c_master_i2c_adapter_init(struct i3c_master_controller *master) |
|
{ |
|
struct i2c_adapter *adap = i3c_master_to_i2c_adapter(master); |
|
struct i2c_dev_desc *i2cdev; |
|
int ret; |
|
|
|
adap->dev.parent = master->dev.parent; |
|
adap->owner = master->dev.parent->driver->owner; |
|
adap->algo = &i3c_master_i2c_algo; |
|
strncpy(adap->name, dev_name(master->dev.parent), sizeof(adap->name)); |
|
|
|
/* FIXME: Should we allow i3c masters to override these values? */ |
|
adap->timeout = 1000; |
|
adap->retries = 3; |
|
|
|
ret = i2c_add_adapter(adap); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* We silently ignore failures here. The bus should keep working |
|
* correctly even if one or more i2c devices are not registered. |
|
*/ |
|
i3c_bus_for_each_i2cdev(&master->bus, i2cdev) |
|
i2cdev->dev = i2c_new_client_device(adap, &i2cdev->boardinfo->base); |
|
|
|
return 0; |
|
} |
|
|
|
static void i3c_master_i2c_adapter_cleanup(struct i3c_master_controller *master) |
|
{ |
|
struct i2c_dev_desc *i2cdev; |
|
|
|
i2c_del_adapter(&master->i2c); |
|
|
|
i3c_bus_for_each_i2cdev(&master->bus, i2cdev) |
|
i2cdev->dev = NULL; |
|
} |
|
|
|
static void i3c_master_unregister_i3c_devs(struct i3c_master_controller *master) |
|
{ |
|
struct i3c_dev_desc *i3cdev; |
|
|
|
i3c_bus_for_each_i3cdev(&master->bus, i3cdev) { |
|
if (!i3cdev->dev) |
|
continue; |
|
|
|
i3cdev->dev->desc = NULL; |
|
if (device_is_registered(&i3cdev->dev->dev)) |
|
device_unregister(&i3cdev->dev->dev); |
|
else |
|
put_device(&i3cdev->dev->dev); |
|
i3cdev->dev = NULL; |
|
} |
|
} |
|
|
|
/** |
|
* i3c_master_queue_ibi() - Queue an IBI |
|
* @dev: the device this IBI is coming from |
|
* @slot: the IBI slot used to store the payload |
|
* |
|
* Queue an IBI to the controller workqueue. The IBI handler attached to |
|
* the dev will be called from a workqueue context. |
|
*/ |
|
void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot) |
|
{ |
|
atomic_inc(&dev->ibi->pending_ibis); |
|
queue_work(dev->common.master->wq, &slot->work); |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_queue_ibi); |
|
|
|
static void i3c_master_handle_ibi(struct work_struct *work) |
|
{ |
|
struct i3c_ibi_slot *slot = container_of(work, struct i3c_ibi_slot, |
|
work); |
|
struct i3c_dev_desc *dev = slot->dev; |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
struct i3c_ibi_payload payload; |
|
|
|
payload.data = slot->data; |
|
payload.len = slot->len; |
|
|
|
if (dev->dev) |
|
dev->ibi->handler(dev->dev, &payload); |
|
|
|
master->ops->recycle_ibi_slot(dev, slot); |
|
if (atomic_dec_and_test(&dev->ibi->pending_ibis)) |
|
complete(&dev->ibi->all_ibis_handled); |
|
} |
|
|
|
static void i3c_master_init_ibi_slot(struct i3c_dev_desc *dev, |
|
struct i3c_ibi_slot *slot) |
|
{ |
|
slot->dev = dev; |
|
INIT_WORK(&slot->work, i3c_master_handle_ibi); |
|
} |
|
|
|
struct i3c_generic_ibi_slot { |
|
struct list_head node; |
|
struct i3c_ibi_slot base; |
|
}; |
|
|
|
struct i3c_generic_ibi_pool { |
|
spinlock_t lock; |
|
unsigned int num_slots; |
|
struct i3c_generic_ibi_slot *slots; |
|
void *payload_buf; |
|
struct list_head free_slots; |
|
struct list_head pending; |
|
}; |
|
|
|
/** |
|
* i3c_generic_ibi_free_pool() - Free a generic IBI pool |
|
* @pool: the IBI pool to free |
|
* |
|
* Free all IBI slots allated by a generic IBI pool. |
|
*/ |
|
void i3c_generic_ibi_free_pool(struct i3c_generic_ibi_pool *pool) |
|
{ |
|
struct i3c_generic_ibi_slot *slot; |
|
unsigned int nslots = 0; |
|
|
|
while (!list_empty(&pool->free_slots)) { |
|
slot = list_first_entry(&pool->free_slots, |
|
struct i3c_generic_ibi_slot, node); |
|
list_del(&slot->node); |
|
nslots++; |
|
} |
|
|
|
/* |
|
* If the number of freed slots is not equal to the number of allocated |
|
* slots we have a leak somewhere. |
|
*/ |
|
WARN_ON(nslots != pool->num_slots); |
|
|
|
kfree(pool->payload_buf); |
|
kfree(pool->slots); |
|
kfree(pool); |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_generic_ibi_free_pool); |
|
|
|
/** |
|
* i3c_generic_ibi_alloc_pool() - Create a generic IBI pool |
|
* @dev: the device this pool will be used for |
|
* @req: IBI setup request describing what the device driver expects |
|
* |
|
* Create a generic IBI pool based on the information provided in @req. |
|
* |
|
* Return: a valid IBI pool in case of success, an ERR_PTR() otherwise. |
|
*/ |
|
struct i3c_generic_ibi_pool * |
|
i3c_generic_ibi_alloc_pool(struct i3c_dev_desc *dev, |
|
const struct i3c_ibi_setup *req) |
|
{ |
|
struct i3c_generic_ibi_pool *pool; |
|
struct i3c_generic_ibi_slot *slot; |
|
unsigned int i; |
|
int ret; |
|
|
|
pool = kzalloc(sizeof(*pool), GFP_KERNEL); |
|
if (!pool) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
spin_lock_init(&pool->lock); |
|
INIT_LIST_HEAD(&pool->free_slots); |
|
INIT_LIST_HEAD(&pool->pending); |
|
|
|
pool->slots = kcalloc(req->num_slots, sizeof(*slot), GFP_KERNEL); |
|
if (!pool->slots) { |
|
ret = -ENOMEM; |
|
goto err_free_pool; |
|
} |
|
|
|
if (req->max_payload_len) { |
|
pool->payload_buf = kcalloc(req->num_slots, |
|
req->max_payload_len, GFP_KERNEL); |
|
if (!pool->payload_buf) { |
|
ret = -ENOMEM; |
|
goto err_free_pool; |
|
} |
|
} |
|
|
|
for (i = 0; i < req->num_slots; i++) { |
|
slot = &pool->slots[i]; |
|
i3c_master_init_ibi_slot(dev, &slot->base); |
|
|
|
if (req->max_payload_len) |
|
slot->base.data = pool->payload_buf + |
|
(i * req->max_payload_len); |
|
|
|
list_add_tail(&slot->node, &pool->free_slots); |
|
pool->num_slots++; |
|
} |
|
|
|
return pool; |
|
|
|
err_free_pool: |
|
i3c_generic_ibi_free_pool(pool); |
|
return ERR_PTR(ret); |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_generic_ibi_alloc_pool); |
|
|
|
/** |
|
* i3c_generic_ibi_get_free_slot() - Get a free slot from a generic IBI pool |
|
* @pool: the pool to query an IBI slot on |
|
* |
|
* Search for a free slot in a generic IBI pool. |
|
* The slot should be returned to the pool using i3c_generic_ibi_recycle_slot() |
|
* when it's no longer needed. |
|
* |
|
* Return: a pointer to a free slot, or NULL if there's no free slot available. |
|
*/ |
|
struct i3c_ibi_slot * |
|
i3c_generic_ibi_get_free_slot(struct i3c_generic_ibi_pool *pool) |
|
{ |
|
struct i3c_generic_ibi_slot *slot; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&pool->lock, flags); |
|
slot = list_first_entry_or_null(&pool->free_slots, |
|
struct i3c_generic_ibi_slot, node); |
|
if (slot) |
|
list_del(&slot->node); |
|
spin_unlock_irqrestore(&pool->lock, flags); |
|
|
|
return slot ? &slot->base : NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_generic_ibi_get_free_slot); |
|
|
|
/** |
|
* i3c_generic_ibi_recycle_slot() - Return a slot to a generic IBI pool |
|
* @pool: the pool to return the IBI slot to |
|
* @s: IBI slot to recycle |
|
* |
|
* Add an IBI slot back to its generic IBI pool. Should be called from the |
|
* master driver struct_master_controller_ops->recycle_ibi() method. |
|
*/ |
|
void i3c_generic_ibi_recycle_slot(struct i3c_generic_ibi_pool *pool, |
|
struct i3c_ibi_slot *s) |
|
{ |
|
struct i3c_generic_ibi_slot *slot; |
|
unsigned long flags; |
|
|
|
if (!s) |
|
return; |
|
|
|
slot = container_of(s, struct i3c_generic_ibi_slot, base); |
|
spin_lock_irqsave(&pool->lock, flags); |
|
list_add_tail(&slot->node, &pool->free_slots); |
|
spin_unlock_irqrestore(&pool->lock, flags); |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_generic_ibi_recycle_slot); |
|
|
|
static int i3c_master_check_ops(const struct i3c_master_controller_ops *ops) |
|
{ |
|
if (!ops || !ops->bus_init || !ops->priv_xfers || |
|
!ops->send_ccc_cmd || !ops->do_daa || !ops->i2c_xfers) |
|
return -EINVAL; |
|
|
|
if (ops->request_ibi && |
|
(!ops->enable_ibi || !ops->disable_ibi || !ops->free_ibi || |
|
!ops->recycle_ibi_slot)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* i3c_master_register() - register an I3C master |
|
* @master: master used to send frames on the bus |
|
* @parent: the parent device (the one that provides this I3C master |
|
* controller) |
|
* @ops: the master controller operations |
|
* @secondary: true if you are registering a secondary master. Will return |
|
* -ENOTSUPP if set to true since secondary masters are not yet |
|
* supported |
|
* |
|
* This function takes care of everything for you: |
|
* |
|
* - creates and initializes the I3C bus |
|
* - populates the bus with static I2C devs if @parent->of_node is not |
|
* NULL |
|
* - registers all I3C devices added by the controller during bus |
|
* initialization |
|
* - registers the I2C adapter and all I2C devices |
|
* |
|
* Return: 0 in case of success, a negative error code otherwise. |
|
*/ |
|
int i3c_master_register(struct i3c_master_controller *master, |
|
struct device *parent, |
|
const struct i3c_master_controller_ops *ops, |
|
bool secondary) |
|
{ |
|
unsigned long i2c_scl_rate = I3C_BUS_I2C_FM_PLUS_SCL_RATE; |
|
struct i3c_bus *i3cbus = i3c_master_get_bus(master); |
|
enum i3c_bus_mode mode = I3C_BUS_MODE_PURE; |
|
struct i2c_dev_boardinfo *i2cbi; |
|
int ret; |
|
|
|
/* We do not support secondary masters yet. */ |
|
if (secondary) |
|
return -ENOTSUPP; |
|
|
|
ret = i3c_master_check_ops(ops); |
|
if (ret) |
|
return ret; |
|
|
|
master->dev.parent = parent; |
|
master->dev.of_node = of_node_get(parent->of_node); |
|
master->dev.bus = &i3c_bus_type; |
|
master->dev.type = &i3c_masterdev_type; |
|
master->dev.release = i3c_masterdev_release; |
|
master->ops = ops; |
|
master->secondary = secondary; |
|
INIT_LIST_HEAD(&master->boardinfo.i2c); |
|
INIT_LIST_HEAD(&master->boardinfo.i3c); |
|
|
|
ret = i3c_bus_init(i3cbus); |
|
if (ret) |
|
return ret; |
|
|
|
device_initialize(&master->dev); |
|
dev_set_name(&master->dev, "i3c-%d", i3cbus->id); |
|
|
|
ret = of_populate_i3c_bus(master); |
|
if (ret) |
|
goto err_put_dev; |
|
|
|
list_for_each_entry(i2cbi, &master->boardinfo.i2c, node) { |
|
switch (i2cbi->lvr & I3C_LVR_I2C_INDEX_MASK) { |
|
case I3C_LVR_I2C_INDEX(0): |
|
if (mode < I3C_BUS_MODE_MIXED_FAST) |
|
mode = I3C_BUS_MODE_MIXED_FAST; |
|
break; |
|
case I3C_LVR_I2C_INDEX(1): |
|
if (mode < I3C_BUS_MODE_MIXED_LIMITED) |
|
mode = I3C_BUS_MODE_MIXED_LIMITED; |
|
break; |
|
case I3C_LVR_I2C_INDEX(2): |
|
if (mode < I3C_BUS_MODE_MIXED_SLOW) |
|
mode = I3C_BUS_MODE_MIXED_SLOW; |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
goto err_put_dev; |
|
} |
|
|
|
if (i2cbi->lvr & I3C_LVR_I2C_FM_MODE) |
|
i2c_scl_rate = I3C_BUS_I2C_FM_SCL_RATE; |
|
} |
|
|
|
ret = i3c_bus_set_mode(i3cbus, mode, i2c_scl_rate); |
|
if (ret) |
|
goto err_put_dev; |
|
|
|
master->wq = alloc_workqueue("%s", 0, 0, dev_name(parent)); |
|
if (!master->wq) { |
|
ret = -ENOMEM; |
|
goto err_put_dev; |
|
} |
|
|
|
ret = i3c_master_bus_init(master); |
|
if (ret) |
|
goto err_put_dev; |
|
|
|
ret = device_add(&master->dev); |
|
if (ret) |
|
goto err_cleanup_bus; |
|
|
|
/* |
|
* Expose our I3C bus as an I2C adapter so that I2C devices are exposed |
|
* through the I2C subsystem. |
|
*/ |
|
ret = i3c_master_i2c_adapter_init(master); |
|
if (ret) |
|
goto err_del_dev; |
|
|
|
/* |
|
* We're done initializing the bus and the controller, we can now |
|
* register I3C devices discovered during the initial DAA. |
|
*/ |
|
master->init_done = true; |
|
i3c_bus_normaluse_lock(&master->bus); |
|
i3c_master_register_new_i3c_devs(master); |
|
i3c_bus_normaluse_unlock(&master->bus); |
|
|
|
return 0; |
|
|
|
err_del_dev: |
|
device_del(&master->dev); |
|
|
|
err_cleanup_bus: |
|
i3c_master_bus_cleanup(master); |
|
|
|
err_put_dev: |
|
put_device(&master->dev); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_register); |
|
|
|
/** |
|
* i3c_master_unregister() - unregister an I3C master |
|
* @master: master used to send frames on the bus |
|
* |
|
* Basically undo everything done in i3c_master_register(). |
|
* |
|
* Return: 0 in case of success, a negative error code otherwise. |
|
*/ |
|
int i3c_master_unregister(struct i3c_master_controller *master) |
|
{ |
|
i3c_master_i2c_adapter_cleanup(master); |
|
i3c_master_unregister_i3c_devs(master); |
|
i3c_master_bus_cleanup(master); |
|
device_unregister(&master->dev); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(i3c_master_unregister); |
|
|
|
int i3c_dev_do_priv_xfers_locked(struct i3c_dev_desc *dev, |
|
struct i3c_priv_xfer *xfers, |
|
int nxfers) |
|
{ |
|
struct i3c_master_controller *master; |
|
|
|
if (!dev) |
|
return -ENOENT; |
|
|
|
master = i3c_dev_get_master(dev); |
|
if (!master || !xfers) |
|
return -EINVAL; |
|
|
|
if (!master->ops->priv_xfers) |
|
return -ENOTSUPP; |
|
|
|
return master->ops->priv_xfers(dev, xfers, nxfers); |
|
} |
|
|
|
int i3c_dev_disable_ibi_locked(struct i3c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master; |
|
int ret; |
|
|
|
if (!dev->ibi) |
|
return -EINVAL; |
|
|
|
master = i3c_dev_get_master(dev); |
|
ret = master->ops->disable_ibi(dev); |
|
if (ret) |
|
return ret; |
|
|
|
reinit_completion(&dev->ibi->all_ibis_handled); |
|
if (atomic_read(&dev->ibi->pending_ibis)) |
|
wait_for_completion(&dev->ibi->all_ibis_handled); |
|
|
|
dev->ibi->enabled = false; |
|
|
|
return 0; |
|
} |
|
|
|
int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
int ret; |
|
|
|
if (!dev->ibi) |
|
return -EINVAL; |
|
|
|
ret = master->ops->enable_ibi(dev); |
|
if (!ret) |
|
dev->ibi->enabled = true; |
|
|
|
return ret; |
|
} |
|
|
|
int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev, |
|
const struct i3c_ibi_setup *req) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
struct i3c_device_ibi_info *ibi; |
|
int ret; |
|
|
|
if (!master->ops->request_ibi) |
|
return -ENOTSUPP; |
|
|
|
if (dev->ibi) |
|
return -EBUSY; |
|
|
|
ibi = kzalloc(sizeof(*ibi), GFP_KERNEL); |
|
if (!ibi) |
|
return -ENOMEM; |
|
|
|
atomic_set(&ibi->pending_ibis, 0); |
|
init_completion(&ibi->all_ibis_handled); |
|
ibi->handler = req->handler; |
|
ibi->max_payload_len = req->max_payload_len; |
|
ibi->num_slots = req->num_slots; |
|
|
|
dev->ibi = ibi; |
|
ret = master->ops->request_ibi(dev, req); |
|
if (ret) { |
|
kfree(ibi); |
|
dev->ibi = NULL; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev) |
|
{ |
|
struct i3c_master_controller *master = i3c_dev_get_master(dev); |
|
|
|
if (!dev->ibi) |
|
return; |
|
|
|
if (WARN_ON(dev->ibi->enabled)) |
|
WARN_ON(i3c_dev_disable_ibi_locked(dev)); |
|
|
|
master->ops->free_ibi(dev); |
|
kfree(dev->ibi); |
|
dev->ibi = NULL; |
|
} |
|
|
|
static int __init i3c_init(void) |
|
{ |
|
return bus_register(&i3c_bus_type); |
|
} |
|
subsys_initcall(i3c_init); |
|
|
|
static void __exit i3c_exit(void) |
|
{ |
|
idr_destroy(&i3c_bus_idr); |
|
bus_unregister(&i3c_bus_type); |
|
} |
|
module_exit(i3c_exit); |
|
|
|
MODULE_AUTHOR("Boris Brezillon <[email protected]>"); |
|
MODULE_DESCRIPTION("I3C core"); |
|
MODULE_LICENSE("GPL v2");
|
|
|