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linux/drivers/i3c/master.c

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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 = container_of(dev, struct i3c_master_controller, 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 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,
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 const struct i3c_device_id *
i3c_device_match_id(struct i3c_device *i3cdev,
const struct i3c_device_id *id_table)
{
struct i3c_device_info devinfo;
const struct i3c_device_id *id;
i3c_device_get_info(i3cdev, &devinfo);
/*
* The lower 32bits of the provisional ID is just filled with a random
* value, try to match using DCR info.
*/
if (!I3C_PID_RND_LOWER_32BITS(devinfo.pid)) {
u16 manuf = I3C_PID_MANUF_ID(devinfo.pid);
u16 part = I3C_PID_PART_ID(devinfo.pid);
u16 ext_info = I3C_PID_EXTRA_INFO(devinfo.pid);
/* First try to match by manufacturer/part ID. */
for (id = id_table; id->match_flags != 0; id++) {
if ((id->match_flags & I3C_MATCH_MANUF_AND_PART) !=
I3C_MATCH_MANUF_AND_PART)
continue;
if (manuf != id->manuf_id || part != id->part_id)
continue;
if ((id->match_flags & I3C_MATCH_EXTRA_INFO) &&
ext_info != id->extra_info)
continue;
return id;
}
}
/* Fallback to DCR match. */
for (id = id_table; id->match_flags != 0; id++) {
if ((id->match_flags & I3C_MATCH_DCR) &&
id->dcr == devinfo.dcr)
return id;
}
return NULL;
}
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,
};
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;
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->boardinfo->lvr;
desc->static_addr = i2cdev->boardinfo->base.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;
unsigned int expected_len;
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;
expected_len = dest.payload.len;
i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMRL, &dest, 1);
ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
if (ret)
goto out;
if (dest.payload.len != expected_len) {
ret = -EIO;
goto out;
}
info->max_read_len = be16_to_cpu(mrl->read_len);
if (info->bcr & I3C_BCR_IBI_PAYLOAD)
info->max_ibi_len = mrl->ibi_len;
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))
return -EIO;
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) {
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 void i3c_master_pre_assign_dyn_addr(struct i3c_dev_desc *dev)
{
struct i3c_master_controller *master = i3c_dev_get_master(dev);
int ret;
if (!dev->boardinfo || !dev->boardinfo->init_dyn_addr ||
!dev->boardinfo->static_addr)
return;
ret = i3c_master_setdasa_locked(master, dev->info.static_addr,
dev->boardinfo->init_dyn_addr);
if (ret)
return;
dev->info.dyn_addr = dev->boardinfo->init_dyn_addr;
ret = i3c_master_reattach_i3c_dev(dev, 0);
if (ret)
goto err_rstdaa;
ret = i3c_master_retrieve_dev_info(dev);
if (ret)
goto err_rstdaa;
return;
err_rstdaa:
i3c_master_rstdaa_locked(master, dev->boardinfo->init_dyn_addr);
}
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->boardinfo->base.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 and statically defined I3C 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. Pre-assign dynamic addresses requested by the FW with SETDASA for I3C
* devices that have a static address
*
* 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 i3c_dev_desc *i3cdev;
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;
}
}
list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) {
struct i3c_device_info info = {
.static_addr = i3cboardinfo->static_addr,
};
if (i3cboardinfo->init_dyn_addr) {
status = i3c_bus_get_addr_slot_status(&master->bus,
i3cboardinfo->init_dyn_addr);
if (status != I3C_ADDR_SLOT_FREE) {
ret = -EBUSY;
goto err_detach_devs;
}
}
i3cdev = i3c_master_alloc_i3c_dev(master, &info);
if (IS_ERR(i3cdev)) {
ret = PTR_ERR(i3cdev);
goto err_detach_devs;
}
i3cdev->boardinfo = i3cboardinfo;
ret = i3c_master_attach_i3c_dev(master, i3cdev);
if (ret) {
i3c_master_free_i3c_dev(i3cdev);
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;
/*
* Pre-assign dynamic address and retrieve device information if
* needed.
*/
i3c_bus_for_each_i3cdev(&master->bus, i3cdev)
i3c_master_pre_assign_dyn_addr(i3cdev);
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 struct i3c_dev_desc *
i3c_master_search_i3c_dev_duplicate(struct i3c_dev_desc *refdev)
{
struct i3c_master_controller *master = refdev->common.master;
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;
olddev = i3c_master_search_i3c_dev_duplicate(newdev);
if (olddev) {
newdev->boardinfo = olddev->boardinfo;
newdev->info.static_addr = olddev->info.static_addr;
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(&master->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)
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_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 dicovered 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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