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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2018 Cadence Design Systems Inc.
- *
- * Author: Boris Brezillon <boris.brezillon@bootlin.com>
- */
- #include <linux/atomic.h>
- #include <linux/bug.h>
- #include <linux/device.h>
- #include <linux/err.h>
- #include <linux/export.h>
- #include <linux/kernel.h>
- #include <linux/list.h>
- #include <linux/of.h>
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/workqueue.h>
- #include "internals.h"
- static DEFINE_IDR(i3c_bus_idr);
- static DEFINE_MUTEX(i3c_core_lock);
- /**
- * i3c_bus_maintenance_lock - Lock the bus for a maintenance operation
- * @bus: I3C bus to take the lock on
- *
- * This function takes the bus lock so that no other operations can occur on
- * the bus. This is needed for all kind of bus maintenance operation, like
- * - enabling/disabling slave events
- * - re-triggering DAA
- * - changing the dynamic address of a device
- * - relinquishing mastership
- * - ...
- *
- * The reason for this kind of locking is that we don't want drivers and core
- * logic to rely on I3C device information that could be changed behind their
- * back.
- */
- static void i3c_bus_maintenance_lock(struct i3c_bus *bus)
- {
- down_write(&bus->lock);
- }
- /**
- * i3c_bus_maintenance_unlock - Release the bus lock after a maintenance
- * operation
- * @bus: I3C bus to release the lock on
- *
- * Should be called when the bus maintenance operation is done. See
- * i3c_bus_maintenance_lock() for more details on what these maintenance
- * operations are.
- */
- static void i3c_bus_maintenance_unlock(struct i3c_bus *bus)
- {
- up_write(&bus->lock);
- }
- /**
- * i3c_bus_normaluse_lock - Lock the bus for a normal operation
- * @bus: I3C bus to take the lock on
- *
- * This function takes the bus lock for any operation that is not a maintenance
- * operation (see i3c_bus_maintenance_lock() for a non-exhaustive list of
- * maintenance operations). Basically all communications with I3C devices are
- * normal operations (HDR, SDR transfers or CCC commands that do not change bus
- * state or I3C dynamic address).
- *
- * Note that this lock is not guaranteeing serialization of normal operations.
- * In other words, transfer requests passed to the I3C master can be submitted
- * in parallel and I3C master drivers have to use their own locking to make
- * sure two different communications are not inter-mixed, or access to the
- * output/input queue is not done while the engine is busy.
- */
- void i3c_bus_normaluse_lock(struct i3c_bus *bus)
- {
- down_read(&bus->lock);
- }
- /**
- * i3c_bus_normaluse_unlock - Release the bus lock after a normal operation
- * @bus: I3C bus to release the lock on
- *
- * Should be called when a normal operation is done. See
- * i3c_bus_normaluse_lock() for more details on what these normal operations
- * are.
- */
- void i3c_bus_normaluse_unlock(struct i3c_bus *bus)
- {
- up_read(&bus->lock);
- }
- static struct i3c_master_controller *
- i3c_bus_to_i3c_master(struct i3c_bus *i3cbus)
- {
- return container_of(i3cbus, struct i3c_master_controller, bus);
- }
- static struct i3c_master_controller *dev_to_i3cmaster(struct device *dev)
- {
- return container_of(dev, struct i3c_master_controller, dev);
- }
- static const struct device_type i3c_device_type;
- static struct i3c_bus *dev_to_i3cbus(struct device *dev)
- {
- struct i3c_master_controller *master;
- if (dev->type == &i3c_device_type)
- return dev_to_i3cdev(dev)->bus;
- master = dev_to_i3cmaster(dev);
- return &master->bus;
- }
- static struct i3c_dev_desc *dev_to_i3cdesc(struct device *dev)
- {
- struct i3c_master_controller *master;
- if (dev->type == &i3c_device_type)
- return dev_to_i3cdev(dev)->desc;
- master = dev_to_i3cmaster(dev);
- return master->this;
- }
- static ssize_t bcr_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *bus = dev_to_i3cbus(dev);
- struct i3c_dev_desc *desc;
- ssize_t ret;
- i3c_bus_normaluse_lock(bus);
- desc = dev_to_i3cdesc(dev);
- ret = sprintf(buf, "%x\n", desc->info.bcr);
- i3c_bus_normaluse_unlock(bus);
- return ret;
- }
- static DEVICE_ATTR_RO(bcr);
- static ssize_t dcr_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *bus = dev_to_i3cbus(dev);
- struct i3c_dev_desc *desc;
- ssize_t ret;
- i3c_bus_normaluse_lock(bus);
- desc = dev_to_i3cdesc(dev);
- ret = sprintf(buf, "%x\n", desc->info.dcr);
- i3c_bus_normaluse_unlock(bus);
- return ret;
- }
- static DEVICE_ATTR_RO(dcr);
- static ssize_t pid_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *bus = dev_to_i3cbus(dev);
- struct i3c_dev_desc *desc;
- ssize_t ret;
- i3c_bus_normaluse_lock(bus);
- desc = dev_to_i3cdesc(dev);
- ret = sprintf(buf, "%llx\n", desc->info.pid);
- i3c_bus_normaluse_unlock(bus);
- return ret;
- }
- static DEVICE_ATTR_RO(pid);
- static ssize_t dynamic_address_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *bus = dev_to_i3cbus(dev);
- struct i3c_dev_desc *desc;
- ssize_t ret;
- i3c_bus_normaluse_lock(bus);
- desc = dev_to_i3cdesc(dev);
- ret = sprintf(buf, "%02x\n", desc->info.dyn_addr);
- i3c_bus_normaluse_unlock(bus);
- return ret;
- }
- static DEVICE_ATTR_RO(dynamic_address);
- static const char * const hdrcap_strings[] = {
- "hdr-ddr", "hdr-tsp", "hdr-tsl",
- };
- static ssize_t hdrcap_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *bus = dev_to_i3cbus(dev);
- struct i3c_dev_desc *desc;
- ssize_t offset = 0, ret;
- unsigned long caps;
- int mode;
- i3c_bus_normaluse_lock(bus);
- desc = dev_to_i3cdesc(dev);
- caps = desc->info.hdr_cap;
- for_each_set_bit(mode, &caps, 8) {
- if (mode >= ARRAY_SIZE(hdrcap_strings))
- break;
- if (!hdrcap_strings[mode])
- continue;
- ret = sprintf(buf + offset, offset ? " %s" : "%s",
- hdrcap_strings[mode]);
- if (ret < 0)
- goto out;
- offset += ret;
- }
- ret = sprintf(buf + offset, "\n");
- if (ret < 0)
- goto out;
- ret = offset + ret;
- out:
- i3c_bus_normaluse_unlock(bus);
- return ret;
- }
- static DEVICE_ATTR_RO(hdrcap);
- static ssize_t modalias_show(struct device *dev,
- struct device_attribute *da, char *buf)
- {
- struct i3c_device *i3c = dev_to_i3cdev(dev);
- struct i3c_device_info devinfo;
- u16 manuf, part, ext;
- i3c_device_get_info(i3c, &devinfo);
- manuf = I3C_PID_MANUF_ID(devinfo.pid);
- part = I3C_PID_PART_ID(devinfo.pid);
- ext = I3C_PID_EXTRA_INFO(devinfo.pid);
- if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
- return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr,
- manuf);
- return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
- devinfo.dcr, manuf, part, ext);
- }
- static DEVICE_ATTR_RO(modalias);
- static struct attribute *i3c_device_attrs[] = {
- &dev_attr_bcr.attr,
- &dev_attr_dcr.attr,
- &dev_attr_pid.attr,
- &dev_attr_dynamic_address.attr,
- &dev_attr_hdrcap.attr,
- &dev_attr_modalias.attr,
- NULL,
- };
- ATTRIBUTE_GROUPS(i3c_device);
- static int i3c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
- {
- struct i3c_device *i3cdev = dev_to_i3cdev(dev);
- struct i3c_device_info devinfo;
- u16 manuf, part, ext;
- i3c_device_get_info(i3cdev, &devinfo);
- manuf = I3C_PID_MANUF_ID(devinfo.pid);
- part = I3C_PID_PART_ID(devinfo.pid);
- ext = I3C_PID_EXTRA_INFO(devinfo.pid);
- if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
- return add_uevent_var(env, "MODALIAS=i3c:dcr%02Xmanuf%04X",
- devinfo.dcr, manuf);
- return add_uevent_var(env,
- "MODALIAS=i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
- devinfo.dcr, manuf, part, ext);
- }
- static const struct device_type i3c_device_type = {
- .groups = i3c_device_groups,
- .uevent = i3c_device_uevent,
- };
- static int i3c_device_match(struct device *dev, struct device_driver *drv)
- {
- struct i3c_device *i3cdev;
- struct i3c_driver *i3cdrv;
- if (dev->type != &i3c_device_type)
- return 0;
- i3cdev = dev_to_i3cdev(dev);
- i3cdrv = drv_to_i3cdrv(drv);
- if (i3c_device_match_id(i3cdev, i3cdrv->id_table))
- return 1;
- return 0;
- }
- static int i3c_device_probe(struct device *dev)
- {
- struct i3c_device *i3cdev = dev_to_i3cdev(dev);
- struct i3c_driver *driver = drv_to_i3cdrv(dev->driver);
- return driver->probe(i3cdev);
- }
- static int i3c_device_remove(struct device *dev)
- {
- struct i3c_device *i3cdev = dev_to_i3cdev(dev);
- struct i3c_driver *driver = drv_to_i3cdrv(dev->driver);
- int ret;
- ret = driver->remove(i3cdev);
- if (ret)
- return ret;
- i3c_device_free_ibi(i3cdev);
- return ret;
- }
- struct bus_type i3c_bus_type = {
- .name = "i3c",
- .match = i3c_device_match,
- .probe = i3c_device_probe,
- .remove = i3c_device_remove,
- };
- static enum i3c_addr_slot_status
- i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr)
- {
- int status, bitpos = addr * 2;
- if (addr > I2C_MAX_ADDR)
- return I3C_ADDR_SLOT_RSVD;
- status = bus->addrslots[bitpos / BITS_PER_LONG];
- status >>= bitpos % BITS_PER_LONG;
- return status & I3C_ADDR_SLOT_STATUS_MASK;
- }
- static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr,
- enum i3c_addr_slot_status status)
- {
- int bitpos = addr * 2;
- unsigned long *ptr;
- if (addr > I2C_MAX_ADDR)
- return;
- ptr = bus->addrslots + (bitpos / BITS_PER_LONG);
- *ptr &= ~((unsigned long)I3C_ADDR_SLOT_STATUS_MASK <<
- (bitpos % BITS_PER_LONG));
- *ptr |= (unsigned long)status << (bitpos % BITS_PER_LONG);
- }
- static bool i3c_bus_dev_addr_is_avail(struct i3c_bus *bus, u8 addr)
- {
- enum i3c_addr_slot_status status;
- status = i3c_bus_get_addr_slot_status(bus, addr);
- return status == I3C_ADDR_SLOT_FREE;
- }
- static int i3c_bus_get_free_addr(struct i3c_bus *bus, u8 start_addr)
- {
- enum i3c_addr_slot_status status;
- u8 addr;
- for (addr = start_addr; addr < I3C_MAX_ADDR; addr++) {
- status = i3c_bus_get_addr_slot_status(bus, addr);
- if (status == I3C_ADDR_SLOT_FREE)
- return addr;
- }
- return -ENOMEM;
- }
- static void i3c_bus_init_addrslots(struct i3c_bus *bus)
- {
- int i;
- /* Addresses 0 to 7 are reserved. */
- for (i = 0; i < 8; i++)
- i3c_bus_set_addr_slot_status(bus, i, I3C_ADDR_SLOT_RSVD);
- /*
- * Reserve broadcast address and all addresses that might collide
- * with the broadcast address when facing a single bit error.
- */
- i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR,
- I3C_ADDR_SLOT_RSVD);
- for (i = 0; i < 7; i++)
- i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR ^ BIT(i),
- I3C_ADDR_SLOT_RSVD);
- }
- static void i3c_bus_cleanup(struct i3c_bus *i3cbus)
- {
- mutex_lock(&i3c_core_lock);
- idr_remove(&i3c_bus_idr, i3cbus->id);
- mutex_unlock(&i3c_core_lock);
- }
- static int i3c_bus_init(struct i3c_bus *i3cbus)
- {
- int ret;
- init_rwsem(&i3cbus->lock);
- INIT_LIST_HEAD(&i3cbus->devs.i2c);
- INIT_LIST_HEAD(&i3cbus->devs.i3c);
- i3c_bus_init_addrslots(i3cbus);
- i3cbus->mode = I3C_BUS_MODE_PURE;
- mutex_lock(&i3c_core_lock);
- ret = idr_alloc(&i3c_bus_idr, i3cbus, 0, 0, GFP_KERNEL);
- mutex_unlock(&i3c_core_lock);
- if (ret < 0)
- return ret;
- i3cbus->id = ret;
- return 0;
- }
- static const char * const i3c_bus_mode_strings[] = {
- [I3C_BUS_MODE_PURE] = "pure",
- [I3C_BUS_MODE_MIXED_FAST] = "mixed-fast",
- [I3C_BUS_MODE_MIXED_LIMITED] = "mixed-limited",
- [I3C_BUS_MODE_MIXED_SLOW] = "mixed-slow",
- };
- static ssize_t mode_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
- ssize_t ret;
- i3c_bus_normaluse_lock(i3cbus);
- if (i3cbus->mode < 0 ||
- i3cbus->mode >= ARRAY_SIZE(i3c_bus_mode_strings) ||
- !i3c_bus_mode_strings[i3cbus->mode])
- ret = sprintf(buf, "unknown\n");
- else
- ret = sprintf(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]);
- i3c_bus_normaluse_unlock(i3cbus);
- return ret;
- }
- static DEVICE_ATTR_RO(mode);
- static ssize_t current_master_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
- ssize_t ret;
- i3c_bus_normaluse_lock(i3cbus);
- ret = sprintf(buf, "%d-%llx\n", i3cbus->id,
- i3cbus->cur_master->info.pid);
- i3c_bus_normaluse_unlock(i3cbus);
- return ret;
- }
- static DEVICE_ATTR_RO(current_master);
- static ssize_t i3c_scl_frequency_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
- ssize_t ret;
- i3c_bus_normaluse_lock(i3cbus);
- ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i3c);
- i3c_bus_normaluse_unlock(i3cbus);
- return ret;
- }
- static DEVICE_ATTR_RO(i3c_scl_frequency);
- static ssize_t i2c_scl_frequency_show(struct device *dev,
- struct device_attribute *da,
- char *buf)
- {
- struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
- ssize_t ret;
- i3c_bus_normaluse_lock(i3cbus);
- ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i2c);
- i3c_bus_normaluse_unlock(i3cbus);
- return ret;
- }
- static DEVICE_ATTR_RO(i2c_scl_frequency);
- static struct attribute *i3c_masterdev_attrs[] = {
- &dev_attr_mode.attr,
- &dev_attr_current_master.attr,
- &dev_attr_i3c_scl_frequency.attr,
- &dev_attr_i2c_scl_frequency.attr,
- &dev_attr_bcr.attr,
- &dev_attr_dcr.attr,
- &dev_attr_pid.attr,
- &dev_attr_dynamic_address.attr,
- &dev_attr_hdrcap.attr,
- NULL,
- };
- ATTRIBUTE_GROUPS(i3c_masterdev);
- static void i3c_masterdev_release(struct device *dev)
- {
- struct i3c_master_controller *master = dev_to_i3cmaster(dev);
- struct i3c_bus *bus = dev_to_i3cbus(dev);
- if (master->wq)
- destroy_workqueue(master->wq);
- WARN_ON(!list_empty(&bus->devs.i2c) || !list_empty(&bus->devs.i3c));
- i3c_bus_cleanup(bus);
- of_node_put(dev->of_node);
- }
- static const struct device_type i3c_masterdev_type = {
- .groups = i3c_masterdev_groups,
- };
- 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 <boris.brezillon@bootlin.com>");
- MODULE_DESCRIPTION("I3C core");
- MODULE_LICENSE("GPL v2");
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