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Wed, 18 Oct 2023 21:58:33 +0000 From: Frank Li To: miquel.raynal@bootlin.com, conor.culhane@silvaco.com, alexandre.belloni@bootlin.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, corbet@lwn.net, joe@perches.com, Frank.Li@nxp.com, linux-i3c@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: gregkh@linuxfoundation.org, imx@lists.linux.dev, jirislaby@kernel.org, linux-serial@vger.kernel.org Subject: [PATCH 1/5] i3c: add slave mode support Date: Wed, 18 Oct 2023 17:58:05 -0400 Message-Id: <20231018215809.3477437-2-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231018215809.3477437-1-Frank.Li@nxp.com> References: <20231018215809.3477437-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR03CA0225.namprd03.prod.outlook.com (2603:10b6:a03:39f::20) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|DB9PR04MB9750:EE_ X-MS-Office365-Filtering-Correlation-Id: e0ce8efa-7fcd-421b-bad0-08dbd0255ef1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This comprises the controller library and function library. Controller library implements functions specific to an slave controller and function library implements functions specific to an slave function. Introduce a new configfs entry to configure the slave function configuring and bind the slave function with slave controller. Signed-off-by: Frank Li --- drivers/i3c/Kconfig | 26 ++ drivers/i3c/Makefile | 2 + drivers/i3c/i3c-cfs.c | 389 +++++++++++++++++++++++++++++ drivers/i3c/slave.c | 453 ++++++++++++++++++++++++++++++++++ include/linux/i3c/slave.h | 503 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 1373 insertions(+) create mode 100644 drivers/i3c/i3c-cfs.c create mode 100644 drivers/i3c/slave.c create mode 100644 include/linux/i3c/slave.h diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig index 30a441506f61c..d5f5ca7cd6a56 100644 --- a/drivers/i3c/Kconfig +++ b/drivers/i3c/Kconfig @@ -22,3 +22,29 @@ menuconfig I3C if I3C source "drivers/i3c/master/Kconfig" endif # I3C + +config I3C_SLAVE + bool "I3C Slave Support" + help + Support I3C Slave Mode. + + Enable this configuration option to support configurable I3C slave. + This should be enabled if the platform has a I3C controller that can + operate in slave mode. + + Enabling this option will build the I3C slave library, which includes + slave controller library and slave function library. + + If in doubt, say "N" to disable slave support. + +config I3C_SLAVE_CONFIGFS + bool "I3C Slave Configfs Support" + depends on I3C_SLAVE + select CONFIGFS_FS + help + Configfs entry for slave function and controller. + + This will enable the configfs entry that can be used to configure + the slave function and used to bind the function with a slave + controller. + diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile index 11982efbc6d91..6407ddec3a4a9 100644 --- a/drivers/i3c/Makefile +++ b/drivers/i3c/Makefile @@ -2,3 +2,5 @@ i3c-y := device.o master.o obj-$(CONFIG_I3C) += i3c.o obj-$(CONFIG_I3C) += master/ +obj-$(CONFIG_I3C_SLAVE) += slave.o +obj-$(CONFIG_I3C_SLAVE_CONFIGFS) += i3c-cfs.o diff --git a/drivers/i3c/i3c-cfs.c b/drivers/i3c/i3c-cfs.c new file mode 100644 index 0000000000000..35e07da50ebb0 --- /dev/null +++ b/drivers/i3c/i3c-cfs.c @@ -0,0 +1,389 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Configfs to configure the I3C Slave + * + * Copyright (C) 2023 NXP + * Author: Frank Li + */ + +#include +#include +#include +#include +#include + +static DEFINE_MUTEX(functions_mutex); +static struct config_group *functions_group; +static struct config_group *controllers_group; + +struct i3c_slave_func_group { + struct config_group group; + struct i3c_slave_func *func; +}; + +struct i3c_slave_ctrl_group { + struct config_group group; + struct i3c_slave_ctrl *ctrl; +}; + +static inline struct i3c_slave_func_group *to_i3c_slave_func_group(struct config_item *item) +{ + return container_of(to_config_group(item), struct i3c_slave_func_group, group); +} + +static inline struct i3c_slave_ctrl_group *to_i3c_slave_ctrl_group(struct config_item *item) +{ + return container_of(to_config_group(item), struct i3c_slave_ctrl_group, group); +} + +static int i3c_slave_ctrl_func_link(struct config_item *ctrl_cfg, struct config_item *func_cfg) +{ + struct i3c_slave_func_group *func_group = to_i3c_slave_func_group(func_cfg); + struct i3c_slave_ctrl_group *ctrl_group = to_i3c_slave_ctrl_group(ctrl_cfg); + struct i3c_slave_ctrl *ctrl = ctrl_group->ctrl; + struct i3c_slave_func *func = func_group->func; + int ret; + + ret = i3c_slave_ctrl_add_func(ctrl, func); + if (ret) + return ret; + + ret = i3c_slave_func_bind(func); + if (ret) { + i3c_slave_ctrl_remove_func(ctrl, func); + return ret; + } + + return 0; +} + +static void i3c_slave_ctrl_func_unlink(struct config_item *ctrl_cfg, struct config_item *func_cfg) +{ + struct i3c_slave_func_group *func_group = to_i3c_slave_func_group(func_cfg->ci_parent); + struct i3c_slave_ctrl_group *ctrl_group = to_i3c_slave_ctrl_group(ctrl_cfg); + struct i3c_slave_ctrl *ctrl = ctrl_group->ctrl; + struct i3c_slave_func *func = func_group->func; + + i3c_slave_func_unbind(func); + i3c_slave_ctrl_remove_func(ctrl, func); +} + +static ssize_t i3c_slave_ctrl_hotjoin_store(struct config_item *item, const char *page, size_t len) +{ + struct i3c_slave_ctrl_group *ctrl_group = to_i3c_slave_ctrl_group(item); + struct i3c_slave_ctrl *ctrl; + int ret; + + ctrl = ctrl_group->ctrl; + + ret = i3c_slave_ctrl_hotjoin(ctrl); + if (ret) { + dev_err(&ctrl->dev, "failed to hotjoin i3c slave controller\n"); + return -EINVAL; + } + + return len; +} + +static ssize_t i3c_slave_ctrl_hotjoin_show(struct config_item *item, char *page) +{ + return sysfs_emit(page, "%d\n", 0); +} + +CONFIGFS_ATTR(i3c_slave_ctrl_, hotjoin); + +static struct configfs_item_operations i3c_slave_ctrl_item_ops = { + .allow_link = i3c_slave_ctrl_func_link, + .drop_link = i3c_slave_ctrl_func_unlink, +}; + +static struct configfs_attribute *i3c_slave_ctrl_attrs[] = { + &i3c_slave_ctrl_attr_hotjoin, + NULL, +}; + +static const struct config_item_type i3c_slave_ctrl_type = { + .ct_item_ops = &i3c_slave_ctrl_item_ops, + .ct_attrs = i3c_slave_ctrl_attrs, + .ct_owner = THIS_MODULE, +}; + +/** + * i3c_slave_cfs_add_ctrl_group() - add I3C slave controller group + * @ctrl: I3C slave controller device + * + * Return: Pointer to struct config_group + */ +struct config_group *i3c_slave_cfs_add_ctrl_group(struct i3c_slave_ctrl *ctrl) +{ + struct i3c_slave_ctrl_group *ctrl_group; + struct config_group *group; + int ret; + + ctrl_group = kzalloc(sizeof(*ctrl_group), GFP_KERNEL); + if (!ctrl_group) { + ret = -ENOMEM; + goto err; + } + + group = &ctrl_group->group; + + config_group_init_type_name(group, dev_name(&ctrl->dev), &i3c_slave_ctrl_type); + ret = configfs_register_group(controllers_group, group); + if (ret) { + pr_err("failed to register configfs group for %s\n", dev_name(&ctrl->dev)); + goto err_register_group; + } + + ctrl_group->ctrl = ctrl; + + return group; + +err_register_group: + kfree(ctrl_group); + +err: + return ERR_PTR(ret); +} +EXPORT_SYMBOL(i3c_slave_cfs_add_ctrl_group); + +/** + * i3c_slave_cfs_remove_ctrl_group() - remove I3C slave controller group + * @group: the group to be removed + */ +void i3c_slave_cfs_remove_ctrl_group(struct config_group *group) +{ + struct i3c_slave_ctrl_group *ctrl_group; + + if (!group) + return; + + ctrl_group = container_of(group, struct i3c_slave_ctrl_group, group); + i3c_slave_ctrl_put(ctrl_group->ctrl); + configfs_unregister_group(&ctrl_group->group); + kfree(ctrl_group); +} +EXPORT_SYMBOL(i3c_slave_cfs_remove_ctrl_group); + +#define I3C_SLAVE_ATTR_R(_name) \ +static ssize_t i3c_slave_func_##_name##_show(struct config_item *item, char *page) \ +{ \ + struct i3c_slave_func *func = to_i3c_slave_func_group(item)->func; \ + return sysfs_emit(page, "0x%04x\n", func->_name); \ +} + +#define I3C_SLAVE_ATTR_W(_name, _u) \ +static ssize_t i3c_slave_func_##_name##_store(struct config_item *item, \ + const char *page, size_t len) \ +{ \ + _u val; \ + struct i3c_slave_func *func = to_i3c_slave_func_group(item)->func; \ + if (kstrto##_u(page, 0, &val) < 0) \ + return -EINVAL; \ + func->_name = val; \ + return len; \ +} + +I3C_SLAVE_ATTR_R(vendor_id); +I3C_SLAVE_ATTR_W(vendor_id, u16); +CONFIGFS_ATTR(i3c_slave_func_, vendor_id); + +I3C_SLAVE_ATTR_R(vendor_info); +I3C_SLAVE_ATTR_W(vendor_info, u16); +CONFIGFS_ATTR(i3c_slave_func_, vendor_info); + +I3C_SLAVE_ATTR_R(part_id); +I3C_SLAVE_ATTR_W(part_id, u16); +CONFIGFS_ATTR(i3c_slave_func_, part_id); + +I3C_SLAVE_ATTR_R(instance_id); +I3C_SLAVE_ATTR_W(instance_id, u8); +CONFIGFS_ATTR(i3c_slave_func_, instance_id); + +I3C_SLAVE_ATTR_R(ext_id); +I3C_SLAVE_ATTR_W(ext_id, u16); +CONFIGFS_ATTR(i3c_slave_func_, ext_id); + +I3C_SLAVE_ATTR_R(max_write_len); +I3C_SLAVE_ATTR_W(max_write_len, u16); +CONFIGFS_ATTR(i3c_slave_func_, max_write_len); + +I3C_SLAVE_ATTR_R(max_read_len); +I3C_SLAVE_ATTR_W(max_read_len, u16); +CONFIGFS_ATTR(i3c_slave_func_, max_read_len); + +I3C_SLAVE_ATTR_R(bcr); +I3C_SLAVE_ATTR_W(bcr, u8); +CONFIGFS_ATTR(i3c_slave_func_, bcr); + +I3C_SLAVE_ATTR_R(dcr); +I3C_SLAVE_ATTR_W(dcr, u8); +CONFIGFS_ATTR(i3c_slave_func_, dcr); + +static struct configfs_attribute *i3c_slave_func_attrs[] = { + &i3c_slave_func_attr_vendor_id, + &i3c_slave_func_attr_vendor_info, + &i3c_slave_func_attr_part_id, + &i3c_slave_func_attr_instance_id, + &i3c_slave_func_attr_ext_id, + &i3c_slave_func_attr_max_write_len, + &i3c_slave_func_attr_max_read_len, + &i3c_slave_func_attr_bcr, + &i3c_slave_func_attr_dcr, + NULL, +}; + +static const struct config_item_type i3c_slave_func_type = { + .ct_attrs = i3c_slave_func_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *i3c_slave_func_make(struct config_group *group, const char *name) +{ + struct i3c_slave_func_group *func_group; + struct i3c_slave_func *func; + int err; + + func_group = kzalloc(sizeof(*func_group), GFP_KERNEL); + if (!func_group) + return ERR_PTR(-ENOMEM); + + config_group_init_type_name(&func_group->group, name, &i3c_slave_func_type); + + func = i3c_slave_func_create(group->cg_item.ci_name, name); + if (IS_ERR(func)) { + pr_err("failed to create i3c slave function device\n"); + err = -EINVAL; + goto free_group; + } + + func->group = &func_group->group; + + func_group->func = func; + + return &func_group->group; + +free_group: + kfree(func_group); + + return ERR_PTR(err); +} + +static void i3c_slave_func_drop(struct config_group *group, struct config_item *item) +{ + config_item_put(item); +} + +static struct configfs_group_operations i3c_slave_func_group_ops = { + .make_group = &i3c_slave_func_make, + .drop_item = &i3c_slave_func_drop, +}; + +static const struct config_item_type i3c_slave_func_group_type = { + .ct_group_ops = &i3c_slave_func_group_ops, + .ct_owner = THIS_MODULE, +}; + +/** + * i3c_slave_cfs_add_func_group() - add I3C slave function group + * @name: group name + * + * Return: Pointer to struct config_group + */ +struct config_group *i3c_slave_cfs_add_func_group(const char *name) +{ + struct config_group *group; + + group = configfs_register_default_group(functions_group, name, + &i3c_slave_func_group_type); + if (IS_ERR(group)) + pr_err("failed to register configfs group for %s function\n", + name); + + return group; +} +EXPORT_SYMBOL(i3c_slave_cfs_add_func_group); + +/** + * i3c_slave_cfs_remove_func_group() - add I3C slave function group + * @group: group to be removed + */ +void i3c_slave_cfs_remove_func_group(struct config_group *group) +{ + if (IS_ERR_OR_NULL(group)) + return; + + configfs_unregister_default_group(group); +} +EXPORT_SYMBOL(i3c_slave_cfs_remove_func_group); + +static const struct config_item_type i3c_slave_controllers_type = { + .ct_owner = THIS_MODULE, +}; + +static const struct config_item_type i3c_slave_functions_type = { + .ct_owner = THIS_MODULE, +}; + +static const struct config_item_type i3c_slave_type = { + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem i3c_slave_cfs_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "i3c_slave", + .ci_type = &i3c_slave_type, + }, + }, + .su_mutex = __MUTEX_INITIALIZER(i3c_slave_cfs_subsys.su_mutex), +}; + +static int __init i3c_slave_cfs_init(void) +{ + int ret; + struct config_group *root = &i3c_slave_cfs_subsys.su_group; + + config_group_init(root); + + ret = configfs_register_subsystem(&i3c_slave_cfs_subsys); + if (ret) { + pr_err("Error %d while registering subsystem %s\n", + ret, root->cg_item.ci_namebuf); + goto err; + } + + functions_group = configfs_register_default_group(root, "functions", + &i3c_slave_functions_type); + if (IS_ERR(functions_group)) { + ret = PTR_ERR(functions_group); + pr_err("Error %d while registering functions group\n", + ret); + goto err_functions_group; + } + + controllers_group = + configfs_register_default_group(root, "controllers", + &i3c_slave_controllers_type); + if (IS_ERR(controllers_group)) { + ret = PTR_ERR(controllers_group); + pr_err("Error %d while registering controllers group\n", + ret); + goto err_controllers_group; + } + + return 0; + +err_controllers_group: + configfs_unregister_default_group(functions_group); + +err_functions_group: + configfs_unregister_subsystem(&i3c_slave_cfs_subsys); + +err: + return ret; +} +module_init(i3c_slave_cfs_init); + +MODULE_DESCRIPTION("I3C FUNC CONFIGFS"); +MODULE_AUTHOR("Frank Li "); diff --git a/drivers/i3c/slave.c b/drivers/i3c/slave.c new file mode 100644 index 0000000000000..4d2cea1d09299 --- /dev/null +++ b/drivers/i3c/slave.c @@ -0,0 +1,453 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * configfs to configure the I3C Slave + * + * Copyright (C) 2023 NXP + * Author: Frank Li + */ + +#include +#include +#include +#include +#include + +static DEFINE_MUTEX(func_lock); +static struct class *i3c_slave_ctrl_class; + +static void i3c_slave_func_dev_release(struct device *dev) +{ + struct i3c_slave_func *func = to_i3c_slave_func(dev); + + kfree(func->name); + kfree(func); +} + +static const struct device_type i3c_slave_func_type = { + .release = i3c_slave_func_dev_release, +}; + +static int i3c_slave_func_match_driver(struct device *dev, struct device_driver *drv) +{ + return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); +} + +static int i3c_slave_func_device_probe(struct device *dev) +{ + struct i3c_slave_func *func = to_i3c_slave_func(dev); + struct i3c_slave_func_driver *driver = to_i3c_slave_func_driver(dev->driver); + + if (!driver->probe) + return -ENODEV; + + func->driver = driver; + + return driver->probe(func); +} + +static void i3c_slave_func_device_remove(struct device *dev) +{ + struct i3c_slave_func *func = to_i3c_slave_func(dev); + struct i3c_slave_func_driver *driver = to_i3c_slave_func_driver(dev->driver); + + if (driver->remove) + driver->remove(func); + func->driver = NULL; +} + +static const struct bus_type i3c_slave_func_bus_type = { + .name = "i3c_slave_func", + .probe = i3c_slave_func_device_probe, + .remove = i3c_slave_func_device_remove, + .match = i3c_slave_func_match_driver, +}; + +static void i3c_slave_ctrl_release(struct device *dev) +{ + kfree(to_i3c_slave_ctrl(dev)); +} + +static void devm_i3c_slave_ctrl_release(struct device *dev, void *res) +{ + struct i3c_slave_ctrl *ctrl = *(struct i3c_slave_ctrl **)res; + + i3c_slave_ctrl_destroy(ctrl); +} + +struct i3c_slave_ctrl * +__devm_i3c_slave_ctrl_create(struct device *dev, const struct i3c_slave_ctrl_ops *ops, + struct module *owner) +{ + struct i3c_slave_ctrl **ptr, *ctrl; + + ptr = devres_alloc(devm_i3c_slave_ctrl_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + ctrl = __i3c_slave_ctrl_create(dev, ops, owner); + if (!IS_ERR(ctrl)) { + *ptr = ctrl; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return ctrl; +} + +static int devm_i3c_slave_ctrl_match(struct device *dev, void *res, void *match_data) +{ + struct i3c_slave_ctrl **ptr = res; + + return *ptr == match_data; +} + +/** + * __i3c_slave_ctrl_create() - create a new slave controller device + * @dev: device that is creating the new slave controller + * @ops: function pointers for performing slave controller operations + * @owner: the owner of the module that creates the slave controller device + * + * Return: Pointer to struct i3c_slave_ctrl + */ +struct i3c_slave_ctrl * +__i3c_slave_ctrl_create(struct device *dev, const struct i3c_slave_ctrl_ops *ops, + struct module *owner) +{ + struct i3c_slave_ctrl *ctrl; + int ret; + + if (WARN_ON(!dev)) + return ERR_PTR(-EINVAL); + + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return ERR_PTR(-ENOMEM); + + device_initialize(&ctrl->dev); + ctrl->dev.class = i3c_slave_ctrl_class; + ctrl->dev.parent = dev; + ctrl->dev.release = i3c_slave_ctrl_release; + ctrl->ops = ops; + + ret = dev_set_name(&ctrl->dev, "%s", dev_name(dev)); + if (ret) + goto put_dev; + + ret = device_add(&ctrl->dev); + if (ret) + goto put_dev; + + ctrl->group = i3c_slave_cfs_add_ctrl_group(ctrl); + if (!ctrl->group) + goto put_dev; + + return ctrl; + +put_dev: + put_device(&ctrl->dev); + kfree(ctrl); + + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(__i3c_slave_ctrl_create); + +/** + * devm_i3c_slave_ctrl_destroy() - destroy the slave controller device + * @dev: device that is creating the new slave controller device + * @ops: function pointers for performing slave controller operations + * @owner: the owner of the module that creates the slave controller device + * + * Invoke to create a new slave controller device and add it to i3c_slave class. While at that, it + * also associates the device with the i3c_slave using devres. On driver detach, release function is + * invoked on the devres data, then devres data is freed. + */ +void devm_i3c_slave_ctrl_destroy(struct device *dev, struct i3c_slave_ctrl *ctrl) +{ + int r; + + r = devres_destroy(dev, devm_i3c_slave_ctrl_release, devm_i3c_slave_ctrl_match, + ctrl); + dev_WARN_ONCE(dev, r, "couldn't find I3C controller resource\n"); +} +EXPORT_SYMBOL_GPL(devm_i3c_slave_ctrl_destroy); + +/** + * i3c_slave_ctrl_destroy() - destroy the slave controller device + * @ctrl: the slave controller device that has to be destroyed + * + * Invoke to destroy the I3C slave device + */ +void i3c_slave_ctrl_destroy(struct i3c_slave_ctrl *ctrl) +{ + i3c_slave_cfs_remove_ctrl_group(ctrl->group); + device_unregister(&ctrl->dev); +} +EXPORT_SYMBOL_GPL(i3c_slave_ctrl_destroy); + +/** + * i3c_slave_ctrl_add_func() - bind I3C slave function to an slave controller + * @ctrl: the controller device to which the slave function should be added + * @func: the slave function to be added + * + * An I3C slave device can have only one functions. + */ +int i3c_slave_ctrl_add_func(struct i3c_slave_ctrl *ctrl, struct i3c_slave_func *func) +{ + if (ctrl->func) + return -EBUSY; + + ctrl->func = func; + func->ctrl = ctrl; + + return 0; +} +EXPORT_SYMBOL_GPL(i3c_slave_ctrl_add_func); + +/** + * i3c_slave_ctrl_remove_func() - unbind I3C slave function to an slave controller + * @ctrl: the controller device to which the slave function should be removed + * @func: the slave function to be removed + * + * An I3C slave device can have only one functions. + */ +void i3c_slave_ctrl_remove_func(struct i3c_slave_ctrl *ctrl, struct i3c_slave_func *func) +{ + ctrl->func = NULL; +} +EXPORT_SYMBOL_GPL(i3c_slave_ctrl_remove_func); + +/** + * i3c_slave_ctrl() - get the I3C slave controller + * @name: device name of the slave controller + * + * Invoke to get struct i3c_slave_ctrl * corresponding to the device name of the + * slave controller + */ +struct i3c_slave_ctrl *i3c_slave_ctrl_get(const char *name) +{ + int ret = -EINVAL; + struct i3c_slave_ctrl *ctrl; + struct device *dev; + struct class_dev_iter iter; + + class_dev_iter_init(&iter, i3c_slave_ctrl_class, NULL, NULL); + while ((dev = class_dev_iter_next(&iter))) { + if (strcmp(name, dev_name(dev))) + continue; + + ctrl = to_i3c_slave_ctrl(dev); + if (!try_module_get(ctrl->ops->owner)) { + ret = -EINVAL; + goto err; + } + + class_dev_iter_exit(&iter); + get_device(&ctrl->dev); + return ctrl; + } + +err: + class_dev_iter_exit(&iter); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(i3c_slave_ctrl_get); + +/** + * i3c_slave_ctrl_put() - release the I3C endpoint controller + * @ctrl: slave controller returned by pci_slave_get() + * + * release the refcount the caller obtained by invoking i3c_slave_ctrl_get() + */ +void i3c_slave_ctrl_put(struct i3c_slave_ctrl *ctrl) +{ + if (!ctrl || IS_ERR(ctrl)) + return; + + module_put(ctrl->ops->owner); + put_device(&ctrl->dev); +} +EXPORT_SYMBOL_GPL(i3c_slave_ctrl_put); + +/** + * i3c_slave_ctrl_hotjoin() - trigger device hotjoin + * @ctrl: slave controller + * + * return: 0: success, others failure + */ +int i3c_slave_ctrl_hotjoin(struct i3c_slave_ctrl *ctrl) +{ + if (!ctrl || IS_ERR(ctrl)) + return -EINVAL; + + if (!ctrl->ops->hotjoin) + return -EINVAL; + + return ctrl->ops->hotjoin(ctrl); +} +EXPORT_SYMBOL_GPL(i3c_slave_ctrl_hotjoin); + +/** + * i3c_slave_func_bind() - Notify the function driver that the function device has been bound to a + * controller device + * @func: the function device which has been bound to the controller device + * + * Invoke to notify the function driver that it has been bound to a controller device + */ +int i3c_slave_func_bind(struct i3c_slave_func *func) +{ + struct device *dev = &func->dev; + int ret; + + if (!func->driver) { + dev_WARN(dev, "func device not bound to driver\n"); + return -EINVAL; + } + + if (!try_module_get(func->driver->owner)) + return -EAGAIN; + + mutex_lock(&func->lock); + ret = func->driver->ops->bind(func); + if (!ret) + func->is_bound = true; + mutex_unlock(&func->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(i3c_slave_func_bind); + +/** + * i3c_slave_func_unbind() - Notify the function driver that the binding between the function device + * and controller device has been lost + * @func: the function device which has lost the binding with the controller device + * + * Invoke to notify the function driver that the binding between the function device and controller + * device has been lost. + */ +void i3c_slave_func_unbind(struct i3c_slave_func *func) +{ + if (!func->driver) { + dev_WARN(&func->dev, "func device not bound to driver\n"); + return; + } + + mutex_lock(&func->lock); + if (func->is_bound) + func->driver->ops->unbind(func); + mutex_unlock(&func->lock); + + module_put(func->driver->owner); +} +EXPORT_SYMBOL_GPL(i3c_slave_func_unbind); + +/** + * i3c_slave_func_create() - create a new I3C function device + * @drv_name: the driver name of the I3C function device. + * @name: the name of the function device. + * + * Invoke to create a new I3C function device by providing the name of the function device. + */ +struct i3c_slave_func *i3c_slave_func_create(const char *drv_name, const char *name) +{ + struct i3c_slave_func *func; + struct device *dev; + int ret; + + func = kzalloc(sizeof(*func), GFP_KERNEL); + if (!func) + return ERR_PTR(-ENOMEM); + + dev = &func->dev; + device_initialize(dev); + dev->bus = &i3c_slave_func_bus_type; + dev->type = &i3c_slave_func_type; + mutex_init(&func->lock); + + ret = dev_set_name(dev, "%s.%s", drv_name, name); + if (ret) { + put_device(dev); + return ERR_PTR(ret); + } + + ret = device_add(dev); + if (ret) { + put_device(dev); + return ERR_PTR(ret); + } + + return func; +} +EXPORT_SYMBOL_GPL(i3c_slave_func_create); + +/** + * __i3c_slave_func_register_driver() - register a new I3C function driver + * @driver: structure representing I3C function driver + * @owner: the owner of the module that registers the I3C function driver + * + * Invoke to register a new I3C function driver. + */ +int __i3c_slave_func_register_driver(struct i3c_slave_func_driver *driver, struct module *owner) +{ + int ret = -EEXIST; + + if (!driver->ops) + return -EINVAL; + + if (!driver->ops->bind || !driver->ops->unbind) + return -EINVAL; + + driver->driver.bus = &i3c_slave_func_bus_type; + driver->driver.owner = owner; + + ret = driver_register(&driver->driver); + if (ret) + return ret; + + i3c_slave_cfs_add_func_group(driver->driver.name); + + return 0; +} +EXPORT_SYMBOL_GPL(__i3c_slave_func_register_driver); + +/** + * i3c_slave_func_unregister_driver() - unregister the I3C function driver + * @driver: the I3C function driver that has to be unregistered + * + * Invoke to unregister the I3C function driver. + */ +void i3c_slave_func_unregister_driver(struct i3c_slave_func_driver *fd) +{ + mutex_lock(&func_lock); + mutex_unlock(&func_lock); +} +EXPORT_SYMBOL_GPL(i3c_slave_func_unregister_driver); + +static int __init i3c_slave_init(void) +{ + int ret; + + i3c_slave_ctrl_class = class_create("i3c_slave"); + if (IS_ERR(i3c_slave_ctrl_class)) { + pr_err("failed to create i3c slave class --> %ld\n", PTR_ERR(i3c_slave_ctrl_class)); + return PTR_ERR(i3c_slave_ctrl_class); + } + + ret = bus_register(&i3c_slave_func_bus_type); + if (ret) { + class_destroy(i3c_slave_ctrl_class); + pr_err("failed to register i3c slave func bus --> %d\n", ret); + return ret; + } + + return 0; +} +module_init(i3c_slave_init); + +static void __exit i3c_slave_exit(void) +{ + class_destroy(i3c_slave_ctrl_class); + bus_unregister(&i3c_slave_func_bus_type); +} +module_exit(i3c_slave_exit); + diff --git a/include/linux/i3c/slave.h b/include/linux/i3c/slave.h new file mode 100644 index 0000000000000..19eb71cfa81f2 --- /dev/null +++ b/include/linux/i3c/slave.h @@ -0,0 +1,503 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2023 NXP. + * + * Author: Frank Li + */ + +#ifndef I3C_SLAVE_H +#define I3C_SLAVE_H + +#include + +struct i3c_slave_func; +struct i3c_slave_ctrl; + +/** + * struct i3c_slave_func_ops - set of function pointers for performing i3c slave function operations + * @bind: ops to perform when a controller device has been bound to function device + * @unbind: ops to perform when a binding has been lost between a controller device and function + * device + */ +struct i3c_slave_func_ops { + int (*bind)(struct i3c_slave_func *func); + void (*unbind)(struct i3c_slave_func *func); +}; + +/** + * struct i3c_slave_func_driver - represents the I3C function driver + * @probe: ops to perform when a new function device has been bound to the function driver + * @remove: ops to perform when the binding between the function device and function driver is + * broken + * @driver: I3C Function driver + * @ops: set of function pointers for performing function operations + * @owner: the owner of the module that registers the I3C function driver + * @epf_group: list of configfs group corresponding to the I3C function driver + */ +struct i3c_slave_func_driver { + int (*probe)(struct i3c_slave_func *func); + void (*remove)(struct i3c_slave_func *func); + + char *name; + struct device_driver driver; + struct i3c_slave_func_ops *ops; + struct module *owner; +}; + +/** + * struct i3c_slave_func - represents the I3C function device + * @dev: the I3C function device + * @name: the name of the I3C function device + * @driver: the function driver to which this function device is bound + * @group: configfs group associated with the EPF device + * @lock: mutex to protect i3c_slave_func_ops + * @ctrl: binded I3C controller device + * @is_bound: indicates if bind notification to function driver has been invoked + * @vednor_id: vendor id + * @part_id: part id + * @instance_id: instance id + * @ext_id: ext id + * @vendor_info: vendor info + * @static_addr: static address for I2C. It is 0 for I3C. + * @max_write_len: maximum write length + * @max_read_len: maximum read length + * @bcr: bus characteristics register (BCR) + * @dcr: device characteristics register (DCR) + */ +struct i3c_slave_func { + struct device dev; + char *name; + struct i3c_slave_func_driver *driver; + struct config_group *group; + /* mutex to protect against concurrent access of i3c_slave_func_ops */ + struct mutex lock; + struct i3c_slave_ctrl *ctrl; + bool is_bound; + + u16 vendor_id; + u16 part_id; + u8 instance_id; + u16 ext_id; + u8 vendor_info; + u16 static_addr; + u16 max_write_len; //0 is hardware default max value + u16 max_read_len; //0 is hardware default max value + u8 bcr; + u8 dcr; +}; + +enum i3c_request_stat { + I3C_REQUEST_OKAY, + I3C_REQUEST_PARTIAL, + I3C_REQUEST_ERR, + I3C_REQUEST_CANCEL, +}; + +/** + * struct i3c_request - represents the an I3C transfer request + * @buf: data buffer + * @length: data length + * @complete: call back function when request finished or cancelled + * @context: general data for complete callback function + * @status: transfer status + * @actual: how much actually transferred + * @ctrl: I3C slave controller associate with this request + * @tx: transfer direction, 1: slave to master, 0: master to slave + */ +struct i3c_request { + void *buf; + unsigned int length; + + void (*complete)(struct i3c_request *req); + void *context; + struct list_head list; + + enum i3c_request_stat status; + unsigned int actual; + struct i3c_slave_ctrl *ctrl; + bool tx; +}; + +/** + * struct i3c_slave_ctrl_features - represents I3C slave controller features. + * @tx_fifo_sz: tx hardware fifo size + * @rx_fifo_sz: rx hardware fifo size + */ +struct i3c_slave_ctrl_features { + u32 tx_fifo_sz; + u32 rx_fifo_sz; +}; + +/** + * struct i3c_slave_ctrl_ops - set of function pointers for performing controller operations + * @set_config: set I3C controller configuration + * @enable: enable I3C controller + * @disable: disable I3C controller + * @raise_ibi: rasie IBI interrupt to master + * @queue: queue an I3C transfer + * @dequeue: dequeue an I3C transfer + * @cancel_all_reqs: call all pending requests + * @fifo_status: current FIFO status + * @fifo_flush: flush hardware FIFO + * @get_features: ops to get the features supported by the I3C slave controller + * @owner: the module owner containing the ops + */ +struct i3c_slave_ctrl_ops { + int (*set_config)(struct i3c_slave_ctrl *ctrl, struct i3c_slave_func *func); + int (*enable)(struct i3c_slave_ctrl *ctrl); + int (*disable)(struct i3c_slave_ctrl *ctrl); + int (*raise_ibi)(struct i3c_slave_ctrl *ctrl, void *p, u8 size); + + struct i3c_request *(*alloc_request)(struct i3c_slave_ctrl *ctrl, gfp_t gfp_flags); + void (*free_request)(struct i3c_request *req); + + int (*queue)(struct i3c_request *req, gfp_t gfp_flags); + int (*dequeue)(struct i3c_request *req); + + void (*cancel_all_reqs)(struct i3c_slave_ctrl *ctrl, bool tx); + + int (*fifo_status)(struct i3c_slave_ctrl *ctrl, bool tx); + void (*fifo_flush)(struct i3c_slave_ctrl *ctrl, bool tx); + int (*hotjoin)(struct i3c_slave_ctrl *ctrl); + int (*set_status_format1)(struct i3c_slave_ctrl *ctrl, u16 status); + u16 (*get_status_format1)(struct i3c_slave_ctrl *ctrl); + u8 (*get_addr)(struct i3c_slave_ctrl *ctrl); + const struct i3c_slave_ctrl_features *(*get_features)(struct i3c_slave_ctrl *ctrl); + struct module *owner; +}; + +/** + * struct i3c_slave_ctrl - represents the I3C slave device + * @dev: I3C slave device + * @ops: function pointers for performing endpoint operations + * @func: slave functions present in this controller device + * @group: configfs group representing the I3C controller device + */ +struct i3c_slave_ctrl { + struct device dev; + const struct i3c_slave_ctrl_ops *ops; + struct i3c_slave_func *func; + struct config_group *group; +}; + +/** + * i3c_slave_ctrl_raise_ibi() - Raise IBI to master + * @ctrl: I3C slave controller + * @p: optional data for IBI + * @size: size of optional data + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline int i3c_slave_ctrl_raise_ibi(struct i3c_slave_ctrl *ctrl, void *p, u8 size) +{ + if (ctrl && ctrl->ops && ctrl->ops->raise_ibi) + return ctrl->ops->raise_ibi(ctrl, p, size); + + return -EINVAL; +} + +/** + * i3c_slave_ctrl_cancel_all_reqs() - Cancel all pending request + * @ctrl: I3C slave controller + * @tx: Transfer diretion queue + * @size: size of optional data + */ +static inline void i3c_slave_ctrl_cancel_all_reqs(struct i3c_slave_ctrl *ctrl, bool tx) +{ + if (ctrl && ctrl->ops && ctrl->ops->cancel_all_reqs) + ctrl->ops->cancel_all_reqs(ctrl, tx); +} + +/** + * i3c_slave_ctrl_set_config() - Set controller configuration + * @ctrl: I3C slave controller device + * @func: Function device + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline int +i3c_slave_ctrl_set_config(struct i3c_slave_ctrl *ctrl, struct i3c_slave_func *func) +{ + if (ctrl && ctrl->ops && ctrl->ops->set_config) + return ctrl->ops->set_config(ctrl, func); + + return -EINVAL; +} + +/** + * i3c_slave_ctrl_enable() - Enable I3C controller + * @ctrl: I3C slave controller device + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline int +i3c_slave_ctrl_enable(struct i3c_slave_ctrl *ctrl) +{ + if (ctrl && ctrl->ops && ctrl->ops->enable) + return ctrl->ops->enable(ctrl); + + return -EINVAL; +} + +/** + * i3c_slave_ctrl_disable() - Disable I3C controller + * @ctrl: I3C slave controller device + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline int +i3c_slave_ctrl_disable(struct i3c_slave_ctrl *ctrl) +{ + if (ctrl && ctrl->ops && ctrl->ops->disable) + return ctrl->ops->disable(ctrl); + + return -EINVAL; +} + +/** + * i3c_slave_ctrl_alloc_request() - Alloc an I3C transfer + * @ctrl: I3C slave controller device + * gfp_flags: additional gfp flags used when allocating the buffers + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline struct i3c_request * +i3c_slave_ctrl_alloc_request(struct i3c_slave_ctrl *ctrl, gfp_t gfp_flags) +{ + struct i3c_request *req = NULL; + + if (ctrl && ctrl->ops && ctrl->ops->alloc_request) + req = ctrl->ops->alloc_request(ctrl, gfp_flags); + else + req = kzalloc(sizeof(*req), gfp_flags); + + if (req) + req->ctrl = ctrl; + + return req; +} + +/** + * i3c_slave_ctrl_free_request() - Free an I3C transfer + * @ctrl: I3C slave controller device + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline void +i3c_slave_ctrl_free_request(struct i3c_request *req) +{ + struct i3c_slave_ctrl *ctrl; + + if (!req) + return; + + ctrl = req->ctrl; + if (ctrl && ctrl->ops && ctrl->ops->free_request) + ctrl->ops->free_request(req); + else + kfree(req); +} + +/** + * i3c_slave_ctrl_queue() - Queue an I3C transfer + * @ctrl: I3C slave controller device + * gfp_flags: additional gfp flags used when allocating the buffers + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline int +i3c_slave_ctrl_queue(struct i3c_request *req, gfp_t gfp_flags) +{ + struct i3c_slave_ctrl *ctrl; + int ret = -EINVAL; + + if (!req) + return -EINVAL; + + ctrl = req->ctrl; + + req->actual = 0; + req->status = 0; + if (ctrl && ctrl->ops && ctrl->ops->queue) + ret = ctrl->ops->queue(req, gfp_flags); + + return ret; +} + +/** + * i3c_slave_ctrl_dequeue() - Dequeue an I3C transfer + * @ctrl: I3C slave controller device + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline int +i3c_slave_ctrl_dequeue(struct i3c_request *req) +{ + struct i3c_slave_ctrl *ctrl; + int ret = -EINVAL; + + if (!req) + return -EINVAL; + + ctrl = req->ctrl; + if (ctrl && ctrl->ops && ctrl->ops->dequeue) + ret = ctrl->ops->dequeue(req); + + return ret; +} + +/** + * i3c_slave_ctrl_fifo_status() - Get controller FIFO status + * @ctrl: I3C slave controller device + * @tx: 1: Slave to master, 0: master to slave + * + * Returns: How much data in FIFO + */ +static inline int +i3c_slave_ctrl_fifo_status(struct i3c_slave_ctrl *ctrl, bool tx) +{ + if (ctrl && ctrl->ops && ctrl->ops->fifo_status) + return ctrl->ops->fifo_status(ctrl, tx); + + return 0; +} + +/** + * i3c_slave_ctrl_fifo_flush() - Flush controller FIFO + * @ctrl: I3C slave controller device + * @tx: 1: Slave to master, 0: master to slave + * + */ +static inline void +i3c_slave_ctrl_fifo_flush(struct i3c_slave_ctrl *ctrl, bool tx) +{ + if (ctrl && ctrl->ops && ctrl->ops->fifo_flush) + return ctrl->ops->fifo_flush(ctrl, tx); +} + +/** + * i3c_slave_ctrl_get_features() - Get controller supported features + * @ctrl: I3C slave controller device + * + * Returns: The pointer to struct i3c_slave_ctrl_features + */ +static inline const struct i3c_slave_ctrl_features* +i3c_slave_ctrl_get_features(struct i3c_slave_ctrl *ctrl) +{ + if (ctrl && ctrl->ops && ctrl->ops->get_features) + return ctrl->ops->get_features(ctrl); + + return NULL; +} + +/** + * i3c_slave_set_status_format1() - Set controller supported features + * &ctrl: I3C slave controller device + * &status: I3C GETSTATUS format1 + * + * Returns: Zero for success, or an error code in case of failure + */ +static inline int +i3c_slave_ctrl_set_status_format1(struct i3c_slave_ctrl *ctrl, u16 status) +{ + if (ctrl && ctrl->ops && ctrl->ops->set_status_format1) + return ctrl->ops->set_status_format1(ctrl, status); + + return -EINVAL; +} + +/** + * i3c_slave_get_status_format1() - Get controller supported features + * &ctrl: I3C slave controller device + * + * Return: I3C GETSTATUS format1 + */ +static inline u16 +i3c_slave_ctrl_get_status_format1(struct i3c_slave_ctrl *ctrl) +{ + if (ctrl && ctrl->ops && ctrl->ops->get_status_format1) + return ctrl->ops->get_status_format1(ctrl); + + return 0; +} + +/** + * i3c_slave_ctrl_get_addr() - Get controller address + * &ctrl: I3C slave controller device + * + * Return: address + */ +static inline u8 i3c_slave_ctrl_get_addr(struct i3c_slave_ctrl *ctrl) +{ + if (ctrl && ctrl->ops && ctrl->ops->get_addr) + return ctrl->ops->get_addr(ctrl); + + return 0; +} + +#define to_i3c_slave_ctrl(device) container_of((device), struct i3c_slave_ctrl, dev) + +#define to_i3c_slave_func(func_dev) container_of((func_dev), struct i3c_slave_func, dev) +#define to_i3c_slave_func_driver(drv) (container_of((drv), struct i3c_slave_func_driver, driver)) + +#define i3c_slave_ctrl_create(dev, ops) \ + __i3c_slave_ctrl_create((dev), (ops), THIS_MODULE) +#define devm_i3c_slave_ctrl_create(dev, ops) \ + __devm_i3c_slave_ctrl_create((dev), (ops), THIS_MODULE) + +struct i3c_slave_ctrl * +__devm_i3c_slave_ctrl_create(struct device *dev, const struct i3c_slave_ctrl_ops *ops, + struct module *owner); +struct i3c_slave_ctrl * +__i3c_slave_ctrl_create(struct device *dev, const struct i3c_slave_ctrl_ops *ops, + struct module *owner); + +void devm_i3c_slave_ctrl_destroy(struct device *dev, struct i3c_slave_ctrl *epc); +void i3c_slave_ctrl_destroy(struct i3c_slave_ctrl *epc); + +int i3c_slave_ctrl_add_func(struct i3c_slave_ctrl *ctrl, struct i3c_slave_func *func); +void i3c_slave_ctrl_remove_func(struct i3c_slave_ctrl *ctrl, struct i3c_slave_func *func); +int i3c_slave_ctrl_hotjoin(struct i3c_slave_ctrl *ctrl); + +struct config_group *i3c_slave_cfs_add_ctrl_group(struct i3c_slave_ctrl *ctrl); + +void i3c_slave_cfs_remove_ctrl_group(struct config_group *group); +struct config_group *i3c_slave_cfs_add_func_group(const char *name); +void i3c_slave_cfs_remove_func_group(struct config_group *group); +struct i3c_slave_ctrl *i3c_slave_ctrl_get(const char *name); +void i3c_slave_ctrl_put(struct i3c_slave_ctrl *ctrl); + +int i3c_slave_func_bind(struct i3c_slave_func *func); +void i3c_slave_func_unbind(struct i3c_slave_func *func); +struct i3c_slave_func *i3c_slave_func_create(const char *drv_name, const char *name); + +#define i3c_slave_func_register_driver(drv) \ + __i3c_slave_func_register_driver(drv, THIS_MODULE) + +int __i3c_slave_func_register_driver(struct i3c_slave_func_driver *drv, struct module *owner); +void i3c_slave_func_unregister_driver(struct i3c_slave_func_driver *drv); + +#define DECLARE_I3C_SLAVE_FUNC(_name, _probe, _remove, _ops) \ + static struct i3c_slave_func_driver _name ## i3c_func = { \ + .driver.name = __stringify(_name), \ + .owner = THIS_MODULE, \ + .probe = _probe, \ + .remove = _remove, \ + .ops = _ops \ + }; \ + MODULE_ALIAS("i3cfunc:" __stringify(_name)) + +#define DECLARE_I3C_SLAVE_INIT(_name, _probe, _remove, _ops) \ + DECLARE_I3C_SLAVE_FUNC(_name, _probe, _remove, _ops); \ + static int __init _name ## mod_init(void) \ + { \ + return i3c_slave_func_register_driver(&_name ## i3c_func); \ + } \ + static void __exit _name ## mod_exit(void) \ + { \ + i3c_slave_func_unregister_driver(&_name ## i3c_func); \ + } \ + module_init(_name ## mod_init); \ + module_exit(_name ## mod_exit) + +#endif From patchwork Wed Oct 18 21:58:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 735432 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ACEE2CDB482 for ; Wed, 18 Oct 2023 21:59:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231468AbjJRV6u (ORCPT ); Wed, 18 Oct 2023 17:58:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232218AbjJRV6s (ORCPT ); Wed, 18 Oct 2023 17:58:48 -0400 Received: from EUR02-VI1-obe.outbound.protection.outlook.com (mail-vi1eur02on2072.outbound.protection.outlook.com [40.107.241.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EEC5912D; 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Wed, 18 Oct 2023 21:58:37 +0000 From: Frank Li To: miquel.raynal@bootlin.com, conor.culhane@silvaco.com, alexandre.belloni@bootlin.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, corbet@lwn.net, joe@perches.com, Frank.Li@nxp.com, linux-i3c@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: gregkh@linuxfoundation.org, imx@lists.linux.dev, jirislaby@kernel.org, linux-serial@vger.kernel.org Subject: [PATCH 2/5] dt-bindings: i3c: svc: add compatible string i3c: silvaco,i3c-slave Date: Wed, 18 Oct 2023 17:58:06 -0400 Message-Id: <20231018215809.3477437-3-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231018215809.3477437-1-Frank.Li@nxp.com> References: <20231018215809.3477437-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR03CA0225.namprd03.prod.outlook.com (2603:10b6:a03:39f::20) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|DB9PR04MB9750:EE_ X-MS-Office365-Filtering-Correlation-Id: 04be4e98-8c9d-476e-752e-08dbd0256175 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Signed-off-by: Frank Li --- .../devicetree/bindings/i3c/silvaco,i3c-master.yaml | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml index 133855f11b4f5..63db63f00a509 100644 --- a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml +++ b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml @@ -4,7 +4,7 @@ $id: http://devicetree.org/schemas/i3c/silvaco,i3c-master.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# -title: Silvaco I3C master +title: Silvaco I3C master/slave maintainers: - Conor Culhane @@ -14,8 +14,10 @@ allOf: properties: compatible: - const: silvaco,i3c-master-v1 - + const: + enum: + - silvaco,i3c-master-v1 + - silvaco,i3c-slave-v1 reg: maxItems: 1 From patchwork Wed Oct 18 21:58:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 736143 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB2F2CDB47E for ; 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b=D2kNKaIc0PK5srgCARDuo+byR6O18iApTQaeeJGRUrmcdnq2rEhIA1DlsB2Ih4FNs6FoXMFNzXyBQ+/Uu8yFnh1XxUg4kAEu8pRyv//axYHVj/VECSUaGCnCkLeTvj1gj6dsOwkxvDywAayvpQK5XELrPh73nGW7zAw6rm+jxXQ= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) by DB9PR04MB9750.eurprd04.prod.outlook.com (2603:10a6:10:4c5::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6907.25; Wed, 18 Oct 2023 21:58:41 +0000 Received: from AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::1774:e25f:f99:aca2]) by AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::1774:e25f:f99:aca2%4]) with mapi id 15.20.6907.022; Wed, 18 Oct 2023 21:58:41 +0000 From: Frank Li To: miquel.raynal@bootlin.com, conor.culhane@silvaco.com, alexandre.belloni@bootlin.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, corbet@lwn.net, joe@perches.com, Frank.Li@nxp.com, linux-i3c@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: gregkh@linuxfoundation.org, imx@lists.linux.dev, jirislaby@kernel.org, linux-serial@vger.kernel.org Subject: [PATCH 3/5] i3c: slave: add svc slave controller support Date: Wed, 18 Oct 2023 17:58:07 -0400 Message-Id: <20231018215809.3477437-4-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231018215809.3477437-1-Frank.Li@nxp.com> References: <20231018215809.3477437-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR03CA0225.namprd03.prod.outlook.com (2603:10b6:a03:39f::20) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|DB9PR04MB9750:EE_ X-MS-Office365-Filtering-Correlation-Id: db58b7a8-2016-4321-086a-08dbd02563f2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: db58b7a8-2016-4321-086a-08dbd02563f2 X-MS-Exchange-CrossTenant-AuthSource: AM6PR04MB4838.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Oct 2023 21:58:41.5149 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: LLL0puCqltKx97ol0+rnLejanqLxCPJQfr3kExV5VxAPJ3bA6HvHUyDKLfgYfzMNG4nOxxW8jEOdBKoJReVhLA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR04MB9750 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org Add Silvaco I3C slave controller support Signed-off-by: Frank Li --- drivers/i3c/Kconfig | 3 + drivers/i3c/Makefile | 1 + drivers/i3c/slave/Kconfig | 9 + drivers/i3c/slave/Makefile | 4 + drivers/i3c/slave/svc-i3c-slave.c | 795 ++++++++++++++++++++++++++++++ 5 files changed, 812 insertions(+) create mode 100644 drivers/i3c/slave/Kconfig create mode 100644 drivers/i3c/slave/Makefile create mode 100644 drivers/i3c/slave/svc-i3c-slave.c diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig index d5f5ca7cd6a56..802a9b3576f13 100644 --- a/drivers/i3c/Kconfig +++ b/drivers/i3c/Kconfig @@ -48,3 +48,6 @@ config I3C_SLAVE_CONFIGFS the slave function and used to bind the function with a slave controller. +if I3C_SLAVE +source "drivers/i3c/slave/Kconfig" +endif # I3C_SLAVE diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile index 6407ddec3a4a9..ef1acbe13fe60 100644 --- a/drivers/i3c/Makefile +++ b/drivers/i3c/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_I3C) += i3c.o obj-$(CONFIG_I3C) += master/ obj-$(CONFIG_I3C_SLAVE) += slave.o obj-$(CONFIG_I3C_SLAVE_CONFIGFS) += i3c-cfs.o +obj-$(CONFIG_I3C_SLAVE) += slave/ diff --git a/drivers/i3c/slave/Kconfig b/drivers/i3c/slave/Kconfig new file mode 100644 index 0000000000000..e385dbdea193b --- /dev/null +++ b/drivers/i3c/slave/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 + +config I3C_SLAVE_CTRL_SVC + tristate "Silvaco I3C Dual-Role Slave driver" + depends on I3C + depends on HAS_IOMEM + depends on !(ALPHA || PARISC) + help + Support for Silvaco I3C Dual-Role Slave Controller. diff --git a/drivers/i3c/slave/Makefile b/drivers/i3c/slave/Makefile new file mode 100644 index 0000000000000..612be24536311 --- /dev/null +++ b/drivers/i3c/slave/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-${CONFIG_I3C_SLAVE_CTRL_SVC} += svc-i3c-slave.o + diff --git a/drivers/i3c/slave/svc-i3c-slave.c b/drivers/i3c/slave/svc-i3c-slave.c new file mode 100644 index 0000000000000..2de741a9e0ff8 --- /dev/null +++ b/drivers/i3c/slave/svc-i3c-slave.c @@ -0,0 +1,795 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2023 NXP. + * + * Author: Frank Li + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum i3c_clks { + PCLK, + FCLK, + SCLK, + MAXCLK, +}; + +struct svc_i3c_slave { + struct device *dev; + void __iomem *regs; + int irq; + struct clk_bulk_data clks[MAXCLK]; + + struct list_head txq; + spinlock_t txq_lock; /* protect tx queue */ + struct list_head rxq; + spinlock_t rxq_lock; /* protect rx queue */ + struct list_head cq; + spinlock_t cq_lock; /* protect complete queue */ + + struct work_struct work; + struct workqueue_struct *workqueue; + + struct completion dacomplete; + struct i3c_slave_ctrl_features features; + + spinlock_t ctrl_lock; /* protext access SCTRL register */ +}; + +#define I3C_SCONFIG 0x4 +#define I3C_SCONFIG_SLVENA_MASK BIT(0) +#define I3C_SCONFIG_OFFLINE_MASK BIT(9) +#define I3C_SCONFIG_SADDR_MASK GENMASK(31, 25) + +#define I3C_SSTATUS 0x8 +#define I3C_SSTATUS_STNOTSTOP_MASK BIT(0) +#define I3C_SSTATUS_STOP_MASK BIT(10) +#define I3C_SSTATUS_RX_PEND_MASK BIT(11) +#define I3C_SSTATUS_TXNOTFULL_MASK BIT(12) +#define I3C_SSTATUS_DACHG_MASK BIT(13) +#define I3C_SSTATUS_EVDET_MASK GENMASK(21, 20) +#define I3C_SSTATUS_EVDET_ACKED 0x3 +#define I3C_SSTATUS_IBIDIS_MASK BIT(24) +#define I3C_SSTATUS_HJDIS_MASK BIT(27) + +#define I3C_SCTRL 0xc +#define I3C_SCTRL_EVENT_MASK GENMASK(1, 0) +#define I3C_SCTRL_EVENT_IBI 0x1 +#define I3C_SCTRL_EVENT_HOTJOIN 0x3 +#define I3C_SCTRL_EXTDATA_MASK BIT(3) +#define I3C_SCTRL_IBIDATA_MASK GENMASK(15, 8) + +#define I3C_SINTSET 0x10 +#define I3C_SINTCLR 0x14 +#define I3C_SINT_START BIT(8) +#define I3C_SINT_MATCHED BIT(9) +#define I3C_SINT_STOP BIT(10) +#define I3C_SINT_RXPEND BIT(11) +#define I3C_SINT_TXSEND BIT(12) +#define I3C_SINT_DACHG BIT(13) +#define I3C_SINT_CCC BIT(14) +#define I3C_SINT_ERRWARN BIT(15) +#define I3C_SINT_DDRMAATCHED BIT(16) +#define I3C_SINT_CHANDLED BIT(17) +#define I3C_SINT_EVENT BIT(18) +#define I3C_SINT_SLVRST BIT(19) + +#define I3C_SDATACTRL 0x2c +#define I3C_SDATACTRL_RXEMPTY_MASK BIT(31) +#define I3C_SDATACTRL_TXFULL_MASK BIT(30) +#define I3C_SDATACTRL_RXCOUNT_MASK GENMASK(28, 24) +#define I3C_SDATACTRL_TXCOUNT_MASK GENMASK(20, 16) +#define I3C_SDATACTRL_FLUSHFB_MASK BIT(1) +#define I3C_SDATACTRL_FLUSHTB_MASK BIT(0) + +#define I3C_SWDATAB 0x30 +#define I3C_SWDATAB_END_ALSO_MASK BIT(16) +#define I3C_SWDATAB_END_MASK BIT(8) + +#define I3C_SWDATAE 0x34 +#define I3C_SRDATAB 0x40 + +#define I3C_SCAPABILITIES 0x60 +#define I3C_SCAPABILITIES_FIFOTX_MASK GENMASK(27, 26) +#define I3C_SCAPABILITIES_FIFORX_MASK GENMASK(29, 28) + +#define I3C_SMAXLIMITS 0x68 +#define I3C_SMAXLIMITS_MAXRD_MASK GENMASK(11, 0) +#define I3C_SMAXLIMITS_MAXWR_MASK GENMASK(27, 16) + +#define I3C_SIDPARTNO 0x6c + +#define I3C_SIDEXT 0x70 +#define I3C_SIDEXT_BCR_MASK GENMASK(23, 16) +#define I3C_SIDEXT_DCR_MASK GENMASK(15, 8) +#define I3C_SVENDORID 0x74 + +#define I3C_SMAPCTRL0 0x11c +#define I3C_SMAPCTRL0_ENA_MASK BIT(0) +#define I3C_SMAPCTRL0_DA_MASK GENMASK(7, 1) + +#define I3C_IBIEXT1 0x140 +#define I3C_IBIEXT1_CNT_MASK GEN_MASK(2, 0) +#define I3C_IBIEXT1_MAX_MASK GEN_MASK(4, 6) +#define I3C_IBIEXT1_EXT1_SHIFT 8 +#define I3C_IBIEXT1_EXT2_SHIFT 16 +#define I3C_IBIEXT1_EXT3_SHIFT 24 + +#define I3C_IBIEXT2 0x144 +#define I3C_IBIEXT2_EXT4_SHIFT 0 +#define I3C_IBIEXT2_EXT5_SHIFT 8 +#define I3C_IBIEXT2_EXT6_SHIFT 16 +#define I3C_IBIEXT2_EXT7_SHIFT 24 + +static int svc_i3c_slave_enable(struct i3c_slave_ctrl *ctrl) +{ + struct svc_i3c_slave *svc; + u32 val; + + svc = dev_get_drvdata(&ctrl->dev); + + val = readl_relaxed(svc->regs + I3C_SCONFIG); + val |= I3C_SCONFIG_SLVENA_MASK; + writel_relaxed(val, svc->regs + I3C_SCONFIG); + + return 0; +} + +static int svc_i3c_slave_disable(struct i3c_slave_ctrl *ctrl) +{ + struct svc_i3c_slave *svc; + u32 val; + + svc = dev_get_drvdata(&ctrl->dev); + + val = readl_relaxed(svc->regs + I3C_SCONFIG); + val &= ~I3C_SCONFIG_SLVENA_MASK; + writel_relaxed(val, svc->regs + I3C_SCONFIG); + + return 0; +} + +static int svc_i3c_slave_set_config(struct i3c_slave_ctrl *ctrl, struct i3c_slave_func *func) +{ + struct svc_i3c_slave *svc; + u32 val; + u32 wm, rm; + + svc = dev_get_drvdata(&ctrl->dev); + + if (func->static_addr > 0x7F) + return -EINVAL; + + val = readl_relaxed(svc->regs + I3C_SCONFIG); + val &= ~I3C_SCONFIG_SLVENA_MASK; + val |= FIELD_PREP(I3C_SCONFIG_SADDR_MASK, func->static_addr); + writel_relaxed(val, svc->regs + I3C_SCONFIG); + + if (func->part_id) + writel_relaxed((func->part_id << 16) | + ((func->instance_id << 12) & GENMASK(15, 12)) | + (func->ext_id & GENMASK(11, 0)), svc->regs + I3C_SIDPARTNO); + + writel_relaxed(FIELD_PREP(I3C_SIDEXT_BCR_MASK, func->bcr) | + FIELD_PREP(I3C_SIDEXT_DCR_MASK, func->dcr), + svc->regs + I3C_SIDEXT); + + wm = func->max_write_len == 0 ? + FIELD_GET(I3C_SMAXLIMITS_MAXWR_MASK, I3C_SMAXLIMITS_MAXWR_MASK) : func->max_write_len; + + wm = max_t(u32, val, 8); + + rm = func->max_read_len == 0 ? + FIELD_GET(I3C_SMAXLIMITS_MAXRD_MASK, I3C_SMAXLIMITS_MAXRD_MASK) : func->max_read_len; + rm = max_t(u32, val, 16); + + val = FIELD_PREP(I3C_SMAXLIMITS_MAXRD_MASK, rm) | FIELD_PREP(I3C_SMAXLIMITS_MAXWR_MASK, wm); + writel_relaxed(val, svc->regs + I3C_SMAXLIMITS); + + writel_relaxed(func->vendor_id, svc->regs + I3C_SVENDORID); + return 0; +} + +const struct i3c_slave_ctrl_features *svc_i3c_get_features(struct i3c_slave_ctrl *ctrl) +{ + struct svc_i3c_slave *svc; + + svc = dev_get_drvdata(&ctrl->dev); + + if (!svc) + return NULL; + + return &svc->features; +} + +static void svc_i3c_queue_complete(struct svc_i3c_slave *svc, struct i3c_request *complete) +{ + unsigned long flags; + + spin_lock_irqsave(&svc->cq_lock, flags); + list_add_tail(&complete->list, &svc->cq); + spin_unlock_irqrestore(&svc->cq_lock, flags); + queue_work(svc->workqueue, &svc->work); +} + +static void svc_i3c_fill_txfifo(struct svc_i3c_slave *svc) +{ + struct i3c_request *req, *complete = NULL; + unsigned long flags; + int val; + + spin_lock_irqsave(&svc->txq_lock, flags); + while ((!!(req = list_first_entry_or_null(&svc->txq, struct i3c_request, list))) && + !((readl_relaxed(svc->regs + I3C_SDATACTRL) & I3C_SDATACTRL_TXFULL_MASK))) { + while (!(readl_relaxed(svc->regs + I3C_SDATACTRL) + & I3C_SDATACTRL_TXFULL_MASK)) { + val = *(u8 *)(req->buf + req->actual); + + if (req->actual + 1 == req->length) + writel_relaxed(val, svc->regs + I3C_SWDATAE); + else + writel_relaxed(val, svc->regs + I3C_SWDATAB); + + req->actual++; + + if (req->actual == req->length) { + list_del(&req->list); + complete = req; + spin_unlock_irqrestore(&svc->txq_lock, flags); + + svc_i3c_queue_complete(svc, complete); + + spin_lock_irqsave(&svc->txq_lock, flags); + break; + } + } + } + spin_unlock_irqrestore(&svc->txq_lock, flags); +} + +static int svc_i3c_slave_queue(struct i3c_request *req, gfp_t) +{ + struct svc_i3c_slave *svc; + struct list_head *q; + unsigned long flags; + spinlock_t *lk; + + svc = dev_get_drvdata(&req->ctrl->dev); + if (!svc) + return -EINVAL; + + if (req->tx) { + q = &svc->txq; + lk = &svc->txq_lock; + } else { + q = &svc->rxq; + lk = &svc->rxq_lock; + } + + spin_lock_irqsave(lk, flags); + list_add_tail(&req->list, q); + spin_unlock_irqrestore(lk, flags); + + if (req->tx) + svc_i3c_fill_txfifo(svc); + + if (req->tx) + writel_relaxed(I3C_SINT_TXSEND, svc->regs + I3C_SINTSET); + else + writel_relaxed(I3C_SINT_RXPEND, svc->regs + I3C_SINTSET); + + return 0; +} + +static int svc_i3c_dequeue(struct i3c_request *req) +{ + struct svc_i3c_slave *svc; + unsigned long flags; + spinlock_t *lk; + + svc = dev_get_drvdata(&req->ctrl->dev); + if (!svc) + return -EINVAL; + + if (req->tx) + lk = &svc->txq_lock; + else + lk = &svc->rxq_lock; + + spin_lock_irqsave(lk, flags); + list_del(&req->list); + spin_unlock_irqrestore(lk, flags); + + return 0; +} + +static void svc_i3c_slave_fifo_flush(struct i3c_slave_ctrl *ctrl, bool tx) +{ + struct svc_i3c_slave *svc; + u32 val; + + svc = dev_get_drvdata(&ctrl->dev); + + val = readl_relaxed(svc->regs + I3C_SDATACTRL); + + val |= tx ? I3C_SDATACTRL_FLUSHTB_MASK : I3C_SDATACTRL_FLUSHFB_MASK; + + writel_relaxed(val, svc->regs + I3C_SDATACTRL); +} + +static int +svc_i3c_slave_raise_ibi(struct i3c_slave_ctrl *ctrl, void *p, u8 size) +{ + struct svc_i3c_slave *svc; + unsigned long flags; + u8 *ibidata = p; + u32 ext1 = 0, ext2 = 0; + u32 val; + int ret; + + svc = dev_get_drvdata(&ctrl->dev); + + if (size && !p) + return -EINVAL; + + if (size > 8) + return -EINVAL; + + val = readl_relaxed(svc->regs + I3C_SSTATUS); + if (val & I3C_SSTATUS_IBIDIS_MASK) + return -EINVAL; + + ret = readl_relaxed_poll_timeout(svc->regs + I3C_SCTRL, val, + !(val & I3C_SCTRL_EVENT_MASK), 0, 10000); + if (ret) { + dev_err(&ctrl->dev, "Timeout when polling for NO event pending"); + val &= ~I3C_SCTRL_EVENT_MASK; + writel_relaxed(val, svc->regs + I3C_SCTRL); + return -ENAVAIL; + } + + spin_lock_irqsave(&svc->ctrl_lock, flags); + + val = readl_relaxed(svc->regs + I3C_SCTRL); + + val &= ~I3C_SCTRL_EVENT_MASK | I3C_SCTRL_IBIDATA_MASK; + val |= FIELD_PREP(I3C_SCTRL_EVENT_MASK, I3C_SCTRL_EVENT_IBI); + + if (size) { + val |= FIELD_PREP(I3C_SCTRL_IBIDATA_MASK, *ibidata); + ibidata++; + + if (size > 1) + val |= I3C_SCTRL_EXTDATA_MASK; + + size--; + if (size > 0) { + ext1 |= (size + 2); + ext1 |= (*ibidata++) << I3C_IBIEXT1_EXT1_SHIFT; + size--; + } + + if (size > 0) { + ext1 |= (*ibidata++) << I3C_IBIEXT1_EXT2_SHIFT; + size--; + } + + if (size > 0) { + ext1 |= (*ibidata++) << I3C_IBIEXT1_EXT3_SHIFT; + size--; + } + + writel_relaxed(ext1, svc->regs + I3C_IBIEXT1); + + if (size > 0) { + ext2 |= (*ibidata++) << I3C_IBIEXT2_EXT4_SHIFT; + size--; + } + + if (size > 0) { + ext2 |= (*ibidata++) << I3C_IBIEXT2_EXT5_SHIFT; + size--; + } + + if (size > 0) { + ext2 |= (*ibidata++) << I3C_IBIEXT2_EXT6_SHIFT; + size--; + } + + if (size > 0) { + ext2 |= (*ibidata++) << I3C_IBIEXT2_EXT7_SHIFT; + size--; + } + + writeb_relaxed(ext2, svc->regs + I3C_IBIEXT2); + } + + /* Issue IBI*/ + writel_relaxed(val, svc->regs + I3C_SCTRL); + spin_unlock_irqrestore(&svc->ctrl_lock, flags); + + ret = readl_relaxed_poll_timeout(svc->regs + I3C_SCTRL, val, + !(val & I3C_SCTRL_EVENT_MASK), 0, 1000000); + if (ret) { + dev_err(&ctrl->dev, "Timeout when polling for IBI finish\n"); + + //clear event to above hang bus + spin_lock_irqsave(&svc->ctrl_lock, flags); + val = readl_relaxed(svc->regs + I3C_SCTRL); + val &= ~I3C_SCTRL_EVENT_MASK; + writel_relaxed(val, svc->regs + I3C_SCTRL); + spin_unlock_irqrestore(&svc->ctrl_lock, flags); + + return -ENAVAIL; + } + + return 0; +} + +static void svc_i3c_slave_complete(struct work_struct *work) +{ + struct svc_i3c_slave *svc = container_of(work, struct svc_i3c_slave, work); + struct i3c_request *req; + unsigned long flags; + + spin_lock_irqsave(&svc->cq_lock, flags); + while (!list_empty(&svc->cq)) { + req = list_first_entry(&svc->cq, struct i3c_request, list); + list_del(&req->list); + spin_unlock_irqrestore(&svc->cq_lock, flags); + req->complete(req); + + spin_lock_irqsave(&svc->cq_lock, flags); + } + spin_unlock_irqrestore(&svc->cq_lock, flags); +} + +static irqreturn_t svc_i3c_slave_irq_handler(int irq, void *dev_id) +{ + struct i3c_request *req, *complete = NULL; + struct svc_i3c_slave *svc = dev_id; + unsigned long flags; + u32 statusFlags; + + statusFlags = readl(svc->regs + I3C_SSTATUS); + writel(statusFlags, svc->regs + I3C_SSTATUS); + + if (statusFlags & I3C_SSTATUS_DACHG_MASK) + complete_all(&svc->dacomplete); + + if (statusFlags & I3C_SSTATUS_RX_PEND_MASK) { + spin_lock_irqsave(&svc->rxq_lock, flags); + req = list_first_entry_or_null(&svc->rxq, struct i3c_request, list); + + if (!req) { + writel_relaxed(I3C_SINT_RXPEND, svc->regs + I3C_SINTCLR); + } else { + while (!(readl_relaxed(svc->regs + I3C_SDATACTRL) & + I3C_SDATACTRL_RXEMPTY_MASK)) { + *(u8 *)(req->buf + req->actual) = + readl_relaxed(svc->regs + I3C_SRDATAB); + req->actual++; + + if (req->actual == req->length) { + complete = req; + list_del(&req->list); + break; + } + } + + if (req->actual != req->length && (statusFlags & I3C_SSTATUS_STOP_MASK)) { + complete = req; + list_del(&req->list); + } + } + spin_unlock_irqrestore(&svc->rxq_lock, flags); + + if (complete) { + spin_lock_irqsave(&svc->cq_lock, flags); + list_add_tail(&complete->list, &svc->cq); + spin_unlock_irqrestore(&svc->cq_lock, flags); + queue_work(svc->workqueue, &svc->work); + complete = NULL; + } + } + + if (statusFlags & I3C_SSTATUS_TXNOTFULL_MASK) { + svc_i3c_fill_txfifo(svc); + + spin_lock_irqsave(&svc->txq_lock, flags); + if (list_empty(&svc->txq)) + writel_relaxed(I3C_SINT_TXSEND, svc->regs + I3C_SINTCLR); + spin_unlock_irqrestore(&svc->txq_lock, flags); + } + + return IRQ_HANDLED; +} + +static void svc_i3c_cancel_all_reqs(struct i3c_slave_ctrl *ctrl, bool tx) +{ + struct svc_i3c_slave *svc; + struct i3c_request *req; + struct list_head *q; + unsigned long flags; + spinlock_t *lk; + + svc = dev_get_drvdata(&ctrl->dev); + if (!svc) + return; + + if (tx) { + q = &svc->txq; + lk = &svc->txq_lock; + } else { + q = &svc->rxq; + lk = &svc->rxq_lock; + } + + spin_lock_irqsave(lk, flags); + while (!list_empty(q)) { + req = list_first_entry(q, struct i3c_request, list); + list_del(&req->list); + spin_unlock_irqrestore(lk, flags); + + req->status = I3C_REQUEST_CANCEL; + req->complete(req); + spin_lock_irqsave(lk, flags); + } + spin_unlock_irqrestore(lk, flags); +} + +static int svc_i3c_hotjoin(struct i3c_slave_ctrl *ctrl) +{ + struct svc_i3c_slave *svc; + int ret; + u32 val; + u32 cfg; + + svc = dev_get_drvdata(&ctrl->dev); + if (!svc) + return -EINVAL; + + reinit_completion(&svc->dacomplete); + + val = readl_relaxed(svc->regs + I3C_SSTATUS); + if (val & I3C_SSTATUS_HJDIS_MASK) { + dev_err(&ctrl->dev, "Hotjoin disabled by i3c master\n"); + return -EINVAL; + } + + ret = readl_relaxed_poll_timeout(svc->regs + I3C_SCTRL, val, + !(val & I3C_SCTRL_EVENT_MASK), 0, 10000); + if (ret) { + dev_err(&ctrl->dev, "Timeout when polling for none event pending"); + return -ENAVAIL; + } + + cfg = readl_relaxed(svc->regs + I3C_SCONFIG); + cfg |= I3C_SCONFIG_OFFLINE_MASK; + writel_relaxed(cfg, svc->regs + I3C_SCONFIG); + + val &= ~(I3C_SCTRL_EVENT_MASK | I3C_SCTRL_IBIDATA_MASK); + val |= FIELD_PREP(I3C_SCTRL_EVENT_MASK, I3C_SCTRL_EVENT_HOTJOIN); + /* Issue hotjoin*/ + writel_relaxed(val, svc->regs + I3C_SCTRL); + + ret = readl_relaxed_poll_timeout(svc->regs + I3C_SCTRL, val, + !(val & I3C_SCTRL_EVENT_MASK), 0, 100000); + if (ret) { + val &= ~FIELD_PREP(I3C_SCTRL_EVENT_MASK, I3C_SCTRL_EVENT_MASK); + writel_relaxed(val, svc->regs + I3C_SCTRL); + dev_err(&ctrl->dev, "Timeout when polling for HOTJOIN finish\n"); + return -EINVAL; + } + + val = readl_relaxed(svc->regs + I3C_SSTATUS); + val = FIELD_GET(I3C_SSTATUS_EVDET_MASK, val); + if (val != I3C_SSTATUS_EVDET_ACKED) { + dev_err(&ctrl->dev, "Master NACKED hotjoin request\n"); + return -EINVAL; + } + + writel_relaxed(I3C_SINT_DACHG, svc->regs + I3C_SINTSET); + ret = wait_for_completion_timeout(&svc->dacomplete, msecs_to_jiffies(100)); + writel_relaxed(I3C_SINT_DACHG, svc->regs + I3C_SINTCLR); + if (!ret) { + dev_err(&ctrl->dev, "wait for da assignment timeout\n"); + return -EIO; + } + + val = readl_relaxed(svc->regs + I3C_SMAPCTRL0); + val = FIELD_GET(I3C_SMAPCTRL0_DA_MASK, val); + dev_info(&ctrl->dev, "Get dynamtic address 0x%x\n", val); + return 0; +} + +static int svc_i3c_set_status_format1(struct i3c_slave_ctrl *ctrl, u16 status) +{ + struct svc_i3c_slave *svc; + unsigned long flags; + u32 val; + + svc = dev_get_drvdata(&ctrl->dev); + + spin_lock_irqsave(&svc->ctrl_lock, flags); + val = readl_relaxed(svc->regs + I3C_SCTRL); + val &= 0xFFFF; + val |= status << 16; + writel_relaxed(val, svc->regs + I3C_SCTRL); + spin_unlock_irqrestore(&svc->ctrl_lock, flags); + + return 0; +} + +static u16 svc_i3c_get_status_format1(struct i3c_slave_ctrl *ctrl) +{ + struct svc_i3c_slave *svc; + + svc = dev_get_drvdata(&ctrl->dev); + + return readl_relaxed(svc->regs + I3C_SCTRL) >> 16; +} + +static u8 svc_i3c_get_addr(struct i3c_slave_ctrl *ctrl) +{ + struct svc_i3c_slave *svc; + int val; + + svc = dev_get_drvdata(&ctrl->dev); + + val = readl_relaxed(svc->regs + I3C_SMAPCTRL0); + + if (val & I3C_SMAPCTRL0_ENA_MASK) + return FIELD_GET(I3C_SMAPCTRL0_DA_MASK, val); + + return 0; +} + +int svc_i3c_fifo_status(struct i3c_slave_ctrl *ctrl, bool tx) +{ + struct svc_i3c_slave *svc; + int val; + + svc = dev_get_drvdata(&ctrl->dev); + + val = readl_relaxed(svc->regs + I3C_SDATACTRL); + + if (tx) + return FIELD_GET(I3C_SDATACTRL_TXCOUNT_MASK, val); + else + return FIELD_GET(I3C_SDATACTRL_RXCOUNT_MASK, val); +} + +static struct i3c_slave_ctrl_ops svc_i3c_slave_ops = { + .set_config = svc_i3c_slave_set_config, + .enable = svc_i3c_slave_enable, + .disable = svc_i3c_slave_disable, + .queue = svc_i3c_slave_queue, + .dequeue = svc_i3c_dequeue, + .raise_ibi = svc_i3c_slave_raise_ibi, + .fifo_flush = svc_i3c_slave_fifo_flush, + .cancel_all_reqs = svc_i3c_cancel_all_reqs, + .get_features = svc_i3c_get_features, + .hotjoin = svc_i3c_hotjoin, + .fifo_status = svc_i3c_fifo_status, + .set_status_format1 = svc_i3c_set_status_format1, + .get_status_format1 = svc_i3c_get_status_format1, + .get_addr = svc_i3c_get_addr, +}; + +static int svc_i3c_slave_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct i3c_slave_ctrl *slave; + struct svc_i3c_slave *svc; + int ret; + u32 val; + + svc = devm_kzalloc(dev, sizeof(*svc), GFP_KERNEL); + if (!svc) + return -ENOMEM; + + svc->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(svc->regs)) + return PTR_ERR(svc->regs); + + svc->clks[PCLK].id = "pclk"; + svc->clks[FCLK].id = "fast_clk"; + svc->clks[SCLK].id = "slow_clk"; + + ret = devm_clk_bulk_get(dev, MAXCLK, svc->clks); + if (ret < 0) { + dev_err(dev, "fail get clks: %d\n", ret); + return ret; + } + + ret = clk_bulk_prepare_enable(MAXCLK, svc->clks); + if (ret < 0) { + dev_err(dev, "fail enable clks: %d\n", ret); + return ret; + } + + svc->irq = platform_get_irq(pdev, 0); + if (svc->irq < 0) + return svc->irq; + + INIT_LIST_HEAD(&svc->txq); + INIT_LIST_HEAD(&svc->rxq); + INIT_LIST_HEAD(&svc->cq); + spin_lock_init(&svc->txq_lock); + spin_lock_init(&svc->rxq_lock); + spin_lock_init(&svc->cq_lock); + spin_lock_init(&svc->ctrl_lock); + + init_completion(&svc->dacomplete); + + INIT_WORK(&svc->work, svc_i3c_slave_complete); + svc->workqueue = alloc_workqueue("%s-cq", 0, 0, dev_name(dev)); + if (!svc->workqueue) + return -ENOMEM; + + /* Disable all IRQ */ + writel_relaxed(0xFFFFFFFF, svc->regs + I3C_SINTCLR); + + val = readl_relaxed(svc->regs + I3C_SCAPABILITIES); + svc->features.tx_fifo_sz = FIELD_GET(I3C_SCAPABILITIES_FIFOTX_MASK, val); + svc->features.tx_fifo_sz = 2 << svc->features.tx_fifo_sz; + + svc->features.rx_fifo_sz = FIELD_GET(I3C_SCAPABILITIES_FIFORX_MASK, val); + svc->features.rx_fifo_sz = 2 << svc->features.rx_fifo_sz; + + ret = devm_request_irq(dev, svc->irq, svc_i3c_slave_irq_handler, 0, "svc-i3c-irq", svc); + if (ret) + return -ENOENT; + + slave = devm_i3c_slave_ctrl_create(dev, &svc_i3c_slave_ops); + if (!slave) + return -ENOMEM; + + dev_set_drvdata(&slave->dev, svc); + + return 0; +} + +static int svc_i3c_slave_remove(struct platform_device *pdev) +{ + return 0; +} + +static const struct of_device_id svc_i3c_slave_of_match_tbl[] = { + { .compatible = "silvaco,i3c-slave-v1" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, svc_i3c_slave_of_match_tbl); + +static struct platform_driver svc_i3c_slave = { + .probe = svc_i3c_slave_probe, + .remove = svc_i3c_slave_remove, + .driver = { + .name = "silvaco-i3c-slave", + .of_match_table = svc_i3c_slave_of_match_tbl, + //.pm = &svc_i3c_pm_ops, + }, +}; +module_platform_driver(svc_i3c_slave); + +MODULE_DESCRIPTION("Silvaco dual-role I3C slave driver"); +MODULE_LICENSE("GPL"); From patchwork Wed Oct 18 21:58:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 736144 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3484CDB482 for ; Wed, 18 Oct 2023 21:59:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235244AbjJRV7C (ORCPT ); Wed, 18 Oct 2023 17:59:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344876AbjJRV6w (ORCPT ); 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Signed-off-by: Frank Li --- drivers/i3c/Kconfig | 1 + drivers/i3c/Makefile | 1 + drivers/i3c/func/Kconfig | 9 + drivers/i3c/func/Makefile | 3 + drivers/i3c/func/tty.c | 548 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 562 insertions(+) create mode 100644 drivers/i3c/func/Kconfig create mode 100644 drivers/i3c/func/Makefile create mode 100644 drivers/i3c/func/tty.c diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig index 802a9b3576f13..9b87cb4a84d85 100644 --- a/drivers/i3c/Kconfig +++ b/drivers/i3c/Kconfig @@ -50,4 +50,5 @@ config I3C_SLAVE_CONFIGFS if I3C_SLAVE source "drivers/i3c/slave/Kconfig" +source "drivers/i3c/func/Kconfig" endif # I3C_SLAVE diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile index ef1acbe13fe60..7814bf2dd9b40 100644 --- a/drivers/i3c/Makefile +++ b/drivers/i3c/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_I3C) += master/ obj-$(CONFIG_I3C_SLAVE) += slave.o obj-$(CONFIG_I3C_SLAVE_CONFIGFS) += i3c-cfs.o obj-$(CONFIG_I3C_SLAVE) += slave/ +obj-$(CONFIG_I3C_SLAVE) += func/ diff --git a/drivers/i3c/func/Kconfig b/drivers/i3c/func/Kconfig new file mode 100644 index 0000000000000..3ebf5bd2592a2 --- /dev/null +++ b/drivers/i3c/func/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 + +config I3C_SLAVE_FUNC_TTY + tristate "PCI Endpoint Test driver" + depends on I3C_SLAVE + help + I3C Slave TTY Function Driver. + + General TTY over I3C slave controller function drivers. diff --git a/drivers/i3c/func/Makefile b/drivers/i3c/func/Makefile new file mode 100644 index 0000000000000..db3262e402edd --- /dev/null +++ b/drivers/i3c/func/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_I3C_SLAVE_FUNC_TTY) += tty.o diff --git a/drivers/i3c/func/tty.c b/drivers/i3c/func/tty.c new file mode 100644 index 0000000000000..ea48db49b2764 --- /dev/null +++ b/drivers/i3c/func/tty.c @@ -0,0 +1,548 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2023 NXP + * Author: Frank Li + */ + +#include +#include +#include +#include +#include + +static DEFINE_IDR(i3c_tty_minors); +static DEFINE_MUTEX(i3c_tty_minors_lock); + +static struct tty_driver *i3c_tty_driver; + +#define I3C_TTY_MINORS 256 + +#define I3C_TX_NOEMPTY BIT(0) +#define I3C_TTY_TRANS_SIZE 16 +#define I3C_TTY_IBI_TX BIT(0) + +struct ttyi3c_port { + struct tty_port port; + int minor; + struct i3c_slave_func *i3cdev; + struct circ_buf xmit; + int tail_in_queue; + struct completion txcomplete; + spinlock_t xlock; + void *buffer; + struct work_struct work; + struct workqueue_struct *workqueue; + u16 status; +}; + +static void i3c_slave_tty_rx_complete(struct i3c_request *req) +{ + struct ttyi3c_port *port = req->context; + + if (req->status == I3C_REQUEST_CANCEL) { + i3c_slave_ctrl_free_request(req); + return; + } + + for (int i = 0; i < req->actual; i++) + tty_insert_flip_char(&port->port, *(u8 *)(req->buf + i), 0); + + tty_flip_buffer_push(&port->port); + req->actual = 0; + req->status = 0; + i3c_slave_ctrl_queue(req, GFP_KERNEL); +} + +static void i3c_slave_tty_tx_complete(struct i3c_request *req) +{ + struct ttyi3c_port *sport = req->context; + struct circ_buf *xmit = &sport->xmit; + unsigned long flags; + int cnt; + + if (req->status == I3C_REQUEST_CANCEL) { + i3c_slave_ctrl_free_request(req); + return; + } + + spin_lock_irqsave(&sport->xlock, flags); + xmit->tail = (xmit->tail + req->actual) & (UART_XMIT_SIZE - 1); + cnt = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); + if (cnt == 0) + complete(&sport->txcomplete); + else + queue_work(sport->workqueue, &sport->work); + + spin_unlock_irqrestore(&sport->xlock, flags); + + if (cnt < WAKEUP_CHARS) + tty_port_tty_wakeup(&sport->port); + + i3c_slave_ctrl_free_request(req); +} + +static void i3c_slave_tty_i3c_work(struct work_struct *work) +{ + struct ttyi3c_port *sport = container_of(work, struct ttyi3c_port, work); + struct circ_buf *xmit = &sport->xmit; + int cnt = CIRC_CNT(xmit->head, sport->tail_in_queue, UART_XMIT_SIZE); + u8 ibi; + + if (cnt == 0) + return; + + while (cnt > 0) { + struct i3c_request *req = i3c_slave_ctrl_alloc_request(sport->i3cdev->ctrl, + GFP_KERNEL); + if (!req) + return; + + req->length = CIRC_CNT_TO_END(xmit->head, sport->tail_in_queue, UART_XMIT_SIZE); + + req->buf = xmit->buf + sport->tail_in_queue; + req->complete = i3c_slave_tty_tx_complete; + req->context = sport; + req->tx = true; + + if (i3c_slave_ctrl_queue(req, GFP_KERNEL)) + return; + + sport->tail_in_queue += req->length; + sport->tail_in_queue &= UART_XMIT_SIZE - 1; + + cnt = CIRC_CNT(xmit->head, sport->tail_in_queue, UART_XMIT_SIZE); + } + + ibi = I3C_TTY_IBI_TX; + i3c_slave_ctrl_raise_ibi(sport->i3cdev->ctrl, &ibi, 1); +} + +static int i3c_port_activate(struct tty_port *port, struct tty_struct *tty) +{ + struct ttyi3c_port *sport = container_of(port, struct ttyi3c_port, port); + const struct i3c_slave_ctrl_features *feature; + struct i3c_slave_func *func = sport->i3cdev; + struct i3c_request *req; + int rxfifo_size; + int offset = 0; + + feature = i3c_slave_ctrl_get_features(func->ctrl); + if (!feature) + return -EINVAL; + + rxfifo_size = feature->rx_fifo_sz; + + if (!rxfifo_size) + rxfifo_size = I3C_TTY_TRANS_SIZE; + + do { + req = i3c_slave_ctrl_alloc_request(func->ctrl, GFP_KERNEL); + if (!req) + goto err; + + req->buf = (void *) (sport->buffer + offset); + req->length = rxfifo_size; + req->context = sport; + req->complete = i3c_slave_tty_rx_complete; + offset += rxfifo_size; + + if (i3c_slave_ctrl_queue(req, GFP_KERNEL)) + goto err; + } while (req && (offset + rxfifo_size) < UART_XMIT_SIZE); + + reinit_completion(&sport->txcomplete); + + return 0; +err: + i3c_slave_ctrl_cancel_all_reqs(func->ctrl, false); + return -ENOMEM; +} + +static void i3c_port_shutdown(struct tty_port *port) +{ + struct ttyi3c_port *sport = + container_of(port, struct ttyi3c_port, port); + + cancel_work_sync(&sport->work); + + i3c_slave_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, true); + i3c_slave_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, false); + + sport->xmit.tail = sport->tail_in_queue = sport->xmit.head; + + i3c_slave_ctrl_fifo_flush(sport->i3cdev->ctrl, true); + i3c_slave_ctrl_fifo_flush(sport->i3cdev->ctrl, false); +} + +static void i3c_port_destruct(struct tty_port *port) +{ + struct ttyi3c_port *sport = + container_of(port, struct ttyi3c_port, port); + + mutex_lock(&i3c_tty_minors_lock); + idr_remove(&i3c_tty_minors, sport->minor); + mutex_unlock(&i3c_tty_minors_lock); +} + +static const struct tty_port_operations i3c_port_ops = { + .shutdown = i3c_port_shutdown, + .activate = i3c_port_activate, + .destruct = i3c_port_destruct, +}; + +static int i3c_slave_tty_bind(struct i3c_slave_func *func) +{ + struct ttyi3c_port *sport; + struct device *tty_dev; + int minor; + int ret; + + sport = dev_get_drvdata(&func->dev); + + if (i3c_slave_ctrl_set_config(func->ctrl, func)) { + dev_err(&func->dev, "failure set i3c config\n"); + return -EINVAL; + } + + sport->buffer = (void *)get_zeroed_page(GFP_KERNEL); + if (!sport->buffer) + return -ENOMEM; + + sport->xmit.buf = (void *)get_zeroed_page(GFP_KERNEL); + if (!sport->xmit.buf) + goto err_alloc_xmit; + + + spin_lock_init(&sport->xlock); + init_completion(&sport->txcomplete); + + mutex_lock(&i3c_tty_minors_lock); + ret = minor = idr_alloc(&i3c_tty_minors, sport, 0, I3C_TTY_MINORS, GFP_KERNEL); + mutex_unlock(&i3c_tty_minors_lock); + + if (minor < 0) + goto err_idr_alloc; + + tty_port_init(&sport->port); + sport->port.ops = &i3c_port_ops; + + tty_dev = tty_port_register_device(&sport->port, i3c_tty_driver, minor, + &func->dev); + if (IS_ERR(tty_dev)) { + ret = PTR_ERR(tty_dev); + goto err_register_port; + } + + sport->minor = minor; + ret = i3c_slave_ctrl_enable(func->ctrl); + if (ret) + goto err_ctrl_enable; + + return 0; + +err_ctrl_enable: + tty_port_unregister_device(&sport->port, i3c_tty_driver, sport->minor); +err_register_port: + mutex_lock(&i3c_tty_minors_lock); + idr_remove(&i3c_tty_minors, sport->minor); + mutex_unlock(&i3c_tty_minors_lock); +err_idr_alloc: + i3c_slave_ctrl_cancel_all_reqs(func->ctrl, false); + free_page((unsigned long)sport->xmit.buf); +err_alloc_xmit: + free_page((unsigned long)sport->buffer); + + dev_err(&func->dev, "bind failure\n"); + + return ret; +} + +static void i3c_slave_tty_unbind(struct i3c_slave_func *func) +{ + struct ttyi3c_port *sport; + + sport = dev_get_drvdata(&func->dev); + + cancel_work_sync(&sport->work); + + i3c_slave_ctrl_disable(func->ctrl); + i3c_slave_ctrl_cancel_all_reqs(func->ctrl, 0); + i3c_slave_ctrl_cancel_all_reqs(func->ctrl, 1); + + tty_port_unregister_device(&sport->port, i3c_tty_driver, sport->minor); + + free_page((unsigned long)sport->buffer); +} + +static struct i3c_slave_func_ops i3c_func_ops = { + .bind = i3c_slave_tty_bind, + .unbind = i3c_slave_tty_unbind, +}; + +static int i3c_tty_probe(struct i3c_slave_func *func) +{ + struct device *dev = &func->dev; + struct ttyi3c_port *port; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + port->i3cdev = func; + dev_set_drvdata(&func->dev, port); + + port->workqueue = alloc_workqueue("%s", 0, 0, dev_name(&func->dev)); + if (!port->workqueue) + return -ENOMEM; + + INIT_WORK(&port->work, i3c_slave_tty_i3c_work); + + return 0; +} + +static void i3c_tty_remove(struct i3c_slave_func *func) +{ + struct ttyi3c_port *port; + + port = dev_get_drvdata(&func->dev); + + destroy_workqueue(port->workqueue); +} + +static struct ttyi3c_port *i3c_get_by_minor(unsigned int minor) +{ + struct ttyi3c_port *sport; + + mutex_lock(&i3c_tty_minors_lock); + sport = idr_find(&i3c_tty_minors, minor); + mutex_unlock(&i3c_tty_minors_lock); + + return sport; +} + +static int i3c_install(struct tty_driver *driver, struct tty_struct *tty) +{ + struct ttyi3c_port *sport; + int ret; + + sport = i3c_get_by_minor(tty->index); + if (!sport) + return -ENODEV; + + ret = tty_standard_install(driver, tty); + if (ret) + return ret; + + tty->driver_data = sport; + + return 0; +} + +static ssize_t i3c_write(struct tty_struct *tty, const unsigned char *buf, size_t count) +{ + struct ttyi3c_port *sport = tty->driver_data; + struct circ_buf *circ = &sport->xmit; + unsigned long flags; + int c, ret = 0; + + spin_lock_irqsave(&sport->xlock, flags); + while (1) { + c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); + if (count < c) + c = count; + if (c <= 0) + break; + + memcpy(circ->buf + circ->head, buf, c); + circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); + buf += c; + count -= c; + ret += c; + } + i3c_slave_ctrl_set_status_format1(sport->i3cdev->ctrl, sport->status | I3C_TX_NOEMPTY); + spin_unlock_irqrestore(&sport->xlock, flags); + + if (circ->head != circ->tail) + queue_work(sport->workqueue, &sport->work); + + return ret; +} + +static int i3c_put_char(struct tty_struct *tty, unsigned char ch) +{ + struct ttyi3c_port *sport = tty->driver_data; + struct circ_buf *circ = &sport->xmit; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&sport->xlock, flags); + + if (sport && CIRC_SPACE(circ->head, circ->tail, UART_XMIT_SIZE) != 0) { + circ->buf[circ->head] = ch; + circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); + ret = 1; + } + + spin_unlock_irqrestore(&sport->xlock, flags); + + return ret; +} + +static void i3c_flush_chars(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + struct circ_buf *circ = &sport->xmit; + unsigned long flags; + + spin_lock_irqsave(&sport->xlock, flags); + if (CIRC_SPACE(circ->head, circ->tail, UART_XMIT_SIZE)) + queue_work(sport->workqueue, &sport->work); + spin_unlock_irqrestore(&sport->xlock, flags); +} + +static unsigned int i3c_write_room(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + struct circ_buf *circ = &sport->xmit; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&sport->xlock, flags); + ret = CIRC_SPACE(circ->head, circ->tail, UART_XMIT_SIZE); + spin_unlock_irqrestore(&sport->xlock, flags); + + return ret; +} + +static void i3c_throttle(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + i3c_slave_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, false); +} + +static void i3c_unthrottle(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + i3c_port_activate(&sport->port, tty); +} + +static int i3c_open(struct tty_struct *tty, struct file *filp) +{ + struct ttyi3c_port *sport = tty->driver_data; + int ret; + + if (!i3c_slave_ctrl_get_addr(sport->i3cdev->ctrl)) { + dev_info(&sport->i3cdev->dev, "No slave addr assigned, try hotjoin"); + ret = i3c_slave_ctrl_hotjoin(sport->i3cdev->ctrl); + if (ret) { + dev_err(&sport->i3cdev->dev, "Hotjoin failure, check connection"); + return ret; + } + } + + return tty_port_open(&sport->port, tty, filp); +} + +static void i3c_close(struct tty_struct *tty, struct file *filp) +{ + struct ttyi3c_port *sport = tty->driver_data; + + if (!sport) + return; + + tty_port_close(tty->port, tty, filp); +} + +static void i3c_wait_until_sent(struct tty_struct *tty, int timeout) +{ + struct ttyi3c_port *sport = tty->driver_data; + struct circ_buf *circ = &sport->xmit; + int val; + int ret; + u8 ibi = I3C_TTY_IBI_TX; + int retry = 100; + + if (circ->head != circ->tail) { + + do { + ret = wait_for_completion_timeout(&sport->txcomplete, timeout / 100); + if (ret) + break; + i3c_slave_ctrl_raise_ibi(sport->i3cdev->ctrl, &ibi, 1); + } while (retry--); + + reinit_completion(&sport->txcomplete); + } + + read_poll_timeout(i3c_slave_ctrl_fifo_status, val, !val, 100, timeout, false, + sport->i3cdev->ctrl, true); + + i3c_slave_ctrl_set_status_format1(sport->i3cdev->ctrl, sport->status & (~I3C_TX_NOEMPTY)); +} + +static const struct tty_operations i3c_tty_ops = { + .install = i3c_install, + .open = i3c_open, + .close = i3c_close, + .write = i3c_write, + .put_char = i3c_put_char, + .flush_chars = i3c_flush_chars, + .write_room = i3c_write_room, + .throttle = i3c_throttle, + .unthrottle = i3c_unthrottle, + .wait_until_sent = i3c_wait_until_sent, +}; + +DECLARE_I3C_SLAVE_FUNC(tty, i3c_tty_probe, i3c_tty_remove, &i3c_func_ops); + +static int __init i3c_tty_init(void) +{ + int ret; + + i3c_tty_driver = tty_alloc_driver( + I3C_TTY_MINORS, TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV); + + if (IS_ERR(i3c_tty_driver)) + return PTR_ERR(i3c_tty_driver); + + i3c_tty_driver->driver_name = "ttySI3C", i3c_tty_driver->name = "ttySI3C", + i3c_tty_driver->minor_start = 0, + i3c_tty_driver->type = TTY_DRIVER_TYPE_SERIAL, + i3c_tty_driver->subtype = SERIAL_TYPE_NORMAL, + i3c_tty_driver->init_termios = tty_std_termios; + i3c_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | + CLOCAL; + i3c_tty_driver->init_termios.c_lflag = 0; + + tty_set_operations(i3c_tty_driver, &i3c_tty_ops); + + ret = tty_register_driver(i3c_tty_driver); + if (ret) { + tty_driver_kref_put(i3c_tty_driver); + return ret; + } + + ret = i3c_slave_func_register_driver(&ttyi3c_func); + if (ret) { + tty_unregister_driver(i3c_tty_driver); + tty_driver_kref_put(i3c_tty_driver); + } + + return ret; +} + +static void __exit i3c_tty_exit(void) +{ + i3c_slave_func_unregister_driver(&ttyi3c_func); + tty_unregister_driver(i3c_tty_driver); + tty_driver_kref_put(i3c_tty_driver); + idr_destroy(&i3c_tty_minors); +} + +module_init(i3c_tty_init); +module_exit(i3c_tty_exit); + +MODULE_LICENSE("GPL"); + From patchwork Wed Oct 18 21:58:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 735431 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96E95CDB483 for ; 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Signed-off-by: Frank Li --- Documentation/driver-api/i3c/index.rst | 1 + .../driver-api/i3c/slave/i3c-slave-cfs.rst | 109 ++++++++++ .../driver-api/i3c/slave/i3c-slave.rst | 189 ++++++++++++++++++ .../driver-api/i3c/slave/i3c-tty-function.rst | 103 ++++++++++ .../driver-api/i3c/slave/i3c-tty-howto.rst | 109 ++++++++++ Documentation/driver-api/i3c/slave/index.rst | 13 ++ 6 files changed, 524 insertions(+) create mode 100644 Documentation/driver-api/i3c/slave/i3c-slave-cfs.rst create mode 100644 Documentation/driver-api/i3c/slave/i3c-slave.rst create mode 100644 Documentation/driver-api/i3c/slave/i3c-tty-function.rst create mode 100644 Documentation/driver-api/i3c/slave/i3c-tty-howto.rst create mode 100644 Documentation/driver-api/i3c/slave/index.rst diff --git a/Documentation/driver-api/i3c/index.rst b/Documentation/driver-api/i3c/index.rst index 783d6dad054b6..63fc51fc8bd58 100644 --- a/Documentation/driver-api/i3c/index.rst +++ b/Documentation/driver-api/i3c/index.rst @@ -9,3 +9,4 @@ I3C subsystem protocol device-driver-api master-driver-api + slave/index diff --git a/Documentation/driver-api/i3c/slave/i3c-slave-cfs.rst b/Documentation/driver-api/i3c/slave/i3c-slave-cfs.rst new file mode 100644 index 0000000000000..d78fcbc4e5587 --- /dev/null +++ b/Documentation/driver-api/i3c/slave/i3c-slave-cfs.rst @@ -0,0 +1,109 @@ +.. SPDX-License-Identifier: GPL-2.0 + +======================================= +Configuring I3C Slave Using CONFIGFS +======================================= + +:Author: Frank Li + +The I3C Slave Core exposes configfs entry (i3c_slave) to configure the I3C +slave function and to bind the slave function +with the slave controller. (For introducing other mechanisms to +configure the I3C Slave Function refer to [1]). + +Mounting configfs +================= + +The I3C Slave Core layer creates i3c_slave directory in the mounted configfs +directory. configfs can be mounted using the following command:: + + mount -t configfs none /sys/kernel/config + +Directory Structure +=================== + +The i3c_slave configfs has two directories at its root: controllers and +functions. Every Controller device present in the system will have an entry in +the *controllers* directory and every Function driver present in the system +will have an entry in the *functions* directory. +:: + + /sys/kernel/config/i3c_slave/ + .. controllers/ + .. functions/ + +Creating Function Device +=================== + +Every registered Function driver will be listed in controllers directory. The +entries corresponding to Function driver will be created by the Function core. +:: + + /sys/kernel/config/i3c_slave/functions/ + .. / + ... / + ... / + ... / + .. / + ... / + ... / + +In order to create a of the type probed by , +the user has to create a directory inside . + +Every directory consists of the following entries that can be +used to configure the standard configuration header of the slave function. +(These entries are created by the framework when any new is +created) +:: + + .. / + ... / + ... vendor_id + ... part_id + ... bcr + ... dcr + ... ext_id + ... instance_id + ... max_read_len + ... max_write_len + ... vendor_info + +Controller Device +========== + +Every registered Controller device will be listed in controllers directory. The +entries corresponding to Controller device will be created by the Controller +core. +:: + + /sys/kernel/config/i3c_slave/controllers/ + .. / + ... / + .. / + ... / + +The directory will have a list of symbolic links to +. These symbolic links should be created by the user to +represent the functions present in the slave device. Only +that represents a physical function can be linked to a Controller device. + +:: + + | controllers/ + | / + | + | functions/ + | / + | / + | vendor_id + | part_id + | bcr + | dcr + | ext_id + | instance_id + | max_read_len + | max_write_len + | vendor_info + +[1] Documentation/I3C/slave/pci-slave.rst diff --git a/Documentation/driver-api/i3c/slave/i3c-slave.rst b/Documentation/driver-api/i3c/slave/i3c-slave.rst new file mode 100644 index 0000000000000..363421241b594 --- /dev/null +++ b/Documentation/driver-api/i3c/slave/i3c-slave.rst @@ -0,0 +1,189 @@ +.. SPDX-License-Identifier: GPL-2.0 + +:Author: Frank Li + +This document is a guide to use the I3C Slave Framework in order to create +slave controller driver, slave function driver, and using configfs +interface to bind the function driver to the controller driver. + +Introduction +============ + +Linux has a comprehensive I3C subsystem to support I3C controllers that +operates in master mode. The subsystem has capability to scan I3C bus,assign +i3c device address, load I3C driver (based on Manufacturer ID, part ID), +support other services like hot-join, In-Band Interrupt(IBI). + +However the I3C controller IP integrated in some SoCs is capable of operating +either in Master mode or Slave mode. I3C Slave Framework will add slave mode +support in Linux. This will help to run Linux in an slave system which can +have a wide variety of use cases from testing or validation, co-processor +accelerator, etc. + +I3C Slave Core +================= + +The I3C Slave Core layer comprises 3 components: the Slave Controller +library, the Slave Function library, and the configfs layer to bind the +slave function with the slave controller. + +I3C Slave Controller Library +------------------------------------ + +The Controller library provides APIs to be used by the controller that can +operate in slave mode. It also provides APIs to be used by function +driver/library in order to implement a particular slave function. + +APIs for the I3C Slave controller Driver +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This section lists the APIs that the I3C Slave core provides to be used +by the I3C controller driver. + +* devm_i3c_slave_ctrl_create()/i3c_slave_ctrl_create() + + The I3C controller driver should implement the following ops: + + * set_config: ops to set i3c configuration + * enable: ops to enable controller + * disable: ops to disable controller + * raise_ibi: ops to raise IBI to master controller + * alloc_request: ops to alloc a transfer request + * free_request: ops to free a transfer request + * queue: ops to queue a request to transfer queue + * dequeue: ops to dequeue a request from transfer queue + * cancel_all_reqs: ops to cancel all request from transfer queue + * fifo_status: ops to get fifo status + * fifo_flush: ops to flush hardware fifo + * get_features: ops to get controller supported features + + The I3C controller driver can then create a new Controller device by + invoking devm_i3c_slave_ctrl_create()/i3c_slave_ctrl_create(). + +* devm_i3c_slave_ctrl_destroy()/i3c_slave_ctrl_destroy() + + The I3C controller driver can destroy the Controller device created by + either devm_i3c_slave_ctrl_create() or i3c_slave_ctrl_create() using + devm_i3c_slave_ctrl_destroy() or i3c_slave_ctrl_destroy(). + +I3C Slave Controller APIs for the I3C Slave Function Driver +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This section lists the APIs that the I3C Slave core provides to be used +by the I3C slave function driver. + +* i3c_slave_ctrl_set_config() + + The I3C slave function driver should use i3c_slave_ctrl_set_config() to + write i3c configuration to the slave controller. + +* i3c_slave_ctrl_enable()/i3c_slave_ctrl_disable() + + The I3C slave function driver should use i3c_slave_ctrl_enable()/ + i3c_slave_ctrl_disable() to enable/disable i3c slave controller. + +* i3c_slave_ctrl_alloc_request()/i3c_slave_ctrl_free_request() + + The I3C slave function driver should usei3c_slave_ctrl_alloc_request() / + i3c_slave_ctrl_free_request() to alloc/free a i3c request. + +* i3c_slave_ctrl_raise_ibi() + + The I3C slave function driver should use i3c_slave_ctrl_raise_ibi() to + raise IBI. + +* i3c_slave_ctrl_queue()/i3c_slave_ctrl_dequeue() + + The I3C slave function driver should use i3c_slave_ctrl_queue()/ + i3c_slave_ctrl_dequeue(), to queue/dequeue I3C transfer to/from transfer + queue. + +* i3c_slave_ctrl_get_features() + + The I3C slave function driver should use i3c_slave_ctrl_get_features() + to get I3C slave controller supported features. + +Other I3C Slave Controller APIs +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +There are other APIs provided by the Controller library. These are used for +binding the I3C Slave Function device with Controlller device. i3c-cfs.c can +be used as reference for using these APIs. + +* i3c_slave_ctrl_get() + + Get a reference to the I3C slave controller based on the device name of + the controller. + +* i3c_slave_ctrl_put() + + Release the reference to the I3C slave controller obtained using + i3c_slave_ctrl_get() + +* i3c_slave_ctrl_add_func() + + Add a I3C slave function to a I3C slave controller. + +* i3c_slave_ctrl_remove_func() + + Remove the I3C slave function from I3C slave controller. + +I3C Slave Function Library +---------------------------------- + +The I3C Slave Function library provides APIs to be used by the function driver +and the Controller library to provide slave mode functionality. + +I3C Slave Function APIs for the I3C Slave Function Driver +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This section lists the APIs that the I3C Slave core provides to be used +by the I3C slave function driver. + +* i3c_slave_func_register_driver() + + The I3C Slave Function driver should implement the following ops: + * bind: ops to perform when a Controller device has been bound to + Function device + * unbind: ops to perform when a binding has been lost between a + Controller device and Function device + + The I3C Function driver can then register the I3C Function driver by using + i3c_slave_func_register_driver(). + +* i3c_slave_func_unregister_driver() + + The I3C Function driver can unregister the I3C Function driver by using + i3c_epf_unregister_driver(). + +APIs for the I3C Slave Controller Library +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This section lists the APIs that the I3C Slave core provides to be used +by the I3C slave controller library. + +Other I3C Slave APIs +~~~~~~~~~~~~~~~~~~~~ + +There are other APIs provided by the Function library. These are used to +notify the function driver when the Function device is bound to the EPC device. +i3c-cfs.c can be used as reference for using these APIs. + +* i3c_slave_func_create() + + Create a new I3C Function device by passing the name of the I3C EPF device. + This name will be used to bind the Function device to a Function driver. + +* i3c_slave_func_destroy() + + Destroy the created I3C Function device. + +* i3c_slave_func_bind() + + i3c_slave_func_bind() should be invoked when the EPF device has been bound + to a Controller device. + +* i3c_slave_func_unbind() + + i3c_slave_func_unbind() should be invoked when the binding between EPC + device and function device is lost. diff --git a/Documentation/driver-api/i3c/slave/i3c-tty-function.rst b/Documentation/driver-api/i3c/slave/i3c-tty-function.rst new file mode 100644 index 0000000000000..3c8521d7aa31a --- /dev/null +++ b/Documentation/driver-api/i3c/slave/i3c-tty-function.rst @@ -0,0 +1,103 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================= +PCI Test Function +================= + +:Author: Kishon Vijay Abraham I + +Traditionally PCI RC has always been validated by using standard +PCI cards like ethernet PCI cards or USB PCI cards or SATA PCI cards. +However with the addition of EP-core in linux kernel, it is possible +to configure a PCI controller that can operate in EP mode to work as +a test device. + +The PCI endpoint test device is a virtual device (defined in software) +used to test the endpoint functionality and serve as a sample driver +for other PCI endpoint devices (to use the EP framework). + +The PCI endpoint test device has the following registers: + + 1) PCI_ENDPOINT_TEST_MAGIC + 2) PCI_ENDPOINT_TEST_COMMAND + 3) PCI_ENDPOINT_TEST_STATUS + 4) PCI_ENDPOINT_TEST_SRC_ADDR + 5) PCI_ENDPOINT_TEST_DST_ADDR + 6) PCI_ENDPOINT_TEST_SIZE + 7) PCI_ENDPOINT_TEST_CHECKSUM + 8) PCI_ENDPOINT_TEST_IRQ_TYPE + 9) PCI_ENDPOINT_TEST_IRQ_NUMBER + +* PCI_ENDPOINT_TEST_MAGIC + +This register will be used to test BAR0. A known pattern will be written +and read back from MAGIC register to verify BAR0. + +* PCI_ENDPOINT_TEST_COMMAND + +This register will be used by the host driver to indicate the function +that the endpoint device must perform. + +======== ================================================================ +Bitfield Description +======== ================================================================ +Bit 0 raise legacy IRQ +Bit 1 raise MSI IRQ +Bit 2 raise MSI-X IRQ +Bit 3 read command (read data from RC buffer) +Bit 4 write command (write data to RC buffer) +Bit 5 copy command (copy data from one RC buffer to another RC buffer) +======== ================================================================ + +* PCI_ENDPOINT_TEST_STATUS + +This register reflects the status of the PCI endpoint device. + +======== ============================== +Bitfield Description +======== ============================== +Bit 0 read success +Bit 1 read fail +Bit 2 write success +Bit 3 write fail +Bit 4 copy success +Bit 5 copy fail +Bit 6 IRQ raised +Bit 7 source address is invalid +Bit 8 destination address is invalid +======== ============================== + +* PCI_ENDPOINT_TEST_SRC_ADDR + +This register contains the source address (RC buffer address) for the +COPY/READ command. + +* PCI_ENDPOINT_TEST_DST_ADDR + +This register contains the destination address (RC buffer address) for +the COPY/WRITE command. + +* PCI_ENDPOINT_TEST_IRQ_TYPE + +This register contains the interrupt type (Legacy/MSI) triggered +for the READ/WRITE/COPY and raise IRQ (Legacy/MSI) commands. + +Possible types: + +====== == +Legacy 0 +MSI 1 +MSI-X 2 +====== == + +* PCI_ENDPOINT_TEST_IRQ_NUMBER + +This register contains the triggered ID interrupt. + +Admissible values: + +====== =========== +Legacy 0 +MSI [1 .. 32] +MSI-X [1 .. 2048] +====== =========== diff --git a/Documentation/driver-api/i3c/slave/i3c-tty-howto.rst b/Documentation/driver-api/i3c/slave/i3c-tty-howto.rst new file mode 100644 index 0000000000000..11c8900fd16f3 --- /dev/null +++ b/Documentation/driver-api/i3c/slave/i3c-tty-howto.rst @@ -0,0 +1,109 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================== +I3C TTY User Guide +=================== + +:Author: Frank Li + +This document is a guide to help users use i3c-slave-tty function driver +and i3ctty master driver for testing I3C. The list of steps to be followed in the +master side and slave side is given below. + +Endpoint Device +=============== + +Endpoint Controller Devices +--------------------------- + +To find the list of slave controller devices in the system:: + + # ls /sys/class/i3c_slave/ + 44330000.i3c-slave + +If CONFIG_I3C_SLAVE_CONFIGFS is enabled:: + + # ls /sys/kernel/config/i3c_slave/controllers/ + 44330000.i3c-slave + + +Endpoint Function Drivers +------------------------- + +To find the list of slave function drivers in the system:: + + # ls /sys/bus/i3c_slave_func/drivers + tty + +If CONFIG_I3C_SLAVE_CONFIGFS is enabled:: + + # ls /sys/kernel/config/i3c_slave/functions + tty + + +Creating i3c-slave-tty Device +---------------------------- + +I3C slave function device can be created using the configfs. To create +i3c-slave-tty device, the following commands can be used:: + + # mount -t configfs none /sys/kernel/config + # cd /sys/kernel/config/i3c_slave/ + # mkdir functions/tty/func1 + +The "mkdir func1" above creates the i3c-slave-tty function device that will +be probed by i3c tty driver. + +The I3C slave framework populates the directory with the following +configurable fields:: + + # ls functions/tty/func1 + bcr dcr ext_id instance_id max_read_len max_write_len + part_id vendor_id vendor_info + +The I3C slave function driver populates these entries with default values +when the device is bound to the driver. The i3c-slave-tty driver populates +vendorid with 0xffff and interrupt_pin with 0x0001:: + + # cat functions/tty/func1/vendor_id + 0x0 + +Configuring i3c-slave-tty Device +------------------------------- + +The user can configure the i3c-slave-tty device using configfs entry. In order +to change the vendorid, the following commands can be used:: + + # echo 0x011b > functions/tty/func1/vendor_id + # echo 0x1000 > functions/tty/func1/part_id + # echo 0x6 > functions/tty/t/bcr + +Binding i3c-slave-tty Device to slave Controller +------------------------------------------------ + +In order for the slave function device to be useful, it has to be bound to +a I3C slave controller driver. Use the configfs to bind the function +device to one of the controller driver present in the system:: + + # ln -s functions/pci_epf_test/func1 controllers/44330000.i3c-slave/ + +I3C Master Device +================ + +Check I3C tty device is probed + + # ls /sys/bus/i3c/devices/0-23610000000 + 0-23610000000:0 bcr dcr driver dynamic_address hdrcap + modalias pid power subsystem tty uevent + +Using Slave TTY function Device +----------------------------------- + +Host side: + cat /dev/ttyI3C0 +Slave side + echo abc >/dev/ttyI3C0 + +You will see "abc" show at console. + +You can use other tty tool to test I3C slave tty device. diff --git a/Documentation/driver-api/i3c/slave/index.rst b/Documentation/driver-api/i3c/slave/index.rst new file mode 100644 index 0000000000000..69727ccf985db --- /dev/null +++ b/Documentation/driver-api/i3c/slave/index.rst @@ -0,0 +1,13 @@ +.. SPDX-License-Identifier: GPL-2.0 + +====================== +I3C Slave Framework +====================== + +.. toctree:: + :maxdepth: 2 + + i3c-slave + i3c-slave-cfs + i3c-tty-howto +