2017-12-11 23:42:57 +00:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2011-2017, The Linux Foundation
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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2017-12-11 23:42:58 +00:00
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#include <linux/idr.h>
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2017-12-11 23:42:59 +00:00
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#include <linux/of.h>
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2018-09-16 23:45:40 +00:00
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#include <linux/of_device.h>
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2017-12-11 23:43:01 +00:00
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#include <linux/pm_runtime.h>
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2017-12-11 23:42:57 +00:00
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#include <linux/slimbus.h>
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2017-12-11 23:42:58 +00:00
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#include "slimbus.h"
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static DEFINE_IDA(ctrl_ida);
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2017-12-11 23:42:57 +00:00
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static const struct slim_device_id *slim_match(const struct slim_device_id *id,
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const struct slim_device *sbdev)
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{
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while (id->manf_id != 0 || id->prod_code != 0) {
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if (id->manf_id == sbdev->e_addr.manf_id &&
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2019-01-14 13:44:46 +00:00
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id->prod_code == sbdev->e_addr.prod_code &&
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id->dev_index == sbdev->e_addr.dev_index &&
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id->instance == sbdev->e_addr.instance)
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2017-12-11 23:42:57 +00:00
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return id;
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id++;
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}
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return NULL;
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}
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static int slim_device_match(struct device *dev, struct device_driver *drv)
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{
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struct slim_device *sbdev = to_slim_device(dev);
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struct slim_driver *sbdrv = to_slim_driver(drv);
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2018-09-16 23:45:42 +00:00
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/* Attempt an OF style match first */
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if (of_driver_match_device(dev, drv))
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return 1;
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2017-12-11 23:42:57 +00:00
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return !!slim_match(sbdrv->id_table, sbdev);
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}
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static int slim_device_probe(struct device *dev)
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{
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struct slim_device *sbdev = to_slim_device(dev);
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struct slim_driver *sbdrv = to_slim_driver(dev->driver);
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2018-09-16 23:45:41 +00:00
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int ret;
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2017-12-11 23:42:57 +00:00
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2018-09-16 23:45:41 +00:00
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ret = sbdrv->probe(sbdev);
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if (ret)
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return ret;
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/* try getting the logical address after probe */
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ret = slim_get_logical_addr(sbdev);
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if (!ret) {
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if (sbdrv->device_status)
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sbdrv->device_status(sbdev, sbdev->status);
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} else {
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dev_err(&sbdev->dev, "Failed to get logical address\n");
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ret = -EPROBE_DEFER;
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}
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return ret;
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2017-12-11 23:42:57 +00:00
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}
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static int slim_device_remove(struct device *dev)
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{
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struct slim_device *sbdev = to_slim_device(dev);
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struct slim_driver *sbdrv;
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if (dev->driver) {
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sbdrv = to_slim_driver(dev->driver);
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if (sbdrv->remove)
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sbdrv->remove(sbdev);
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}
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return 0;
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}
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2018-09-16 23:45:40 +00:00
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static int slim_device_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct slim_device *sbdev = to_slim_device(dev);
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int ret;
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ret = of_device_uevent_modalias(dev, env);
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if (ret != -ENODEV)
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return ret;
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return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev));
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}
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2017-12-11 23:42:57 +00:00
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struct bus_type slimbus_bus = {
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.name = "slimbus",
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.match = slim_device_match,
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.probe = slim_device_probe,
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.remove = slim_device_remove,
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2018-09-16 23:45:40 +00:00
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.uevent = slim_device_uevent,
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2017-12-11 23:42:57 +00:00
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};
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EXPORT_SYMBOL_GPL(slimbus_bus);
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/*
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* __slim_driver_register() - Client driver registration with SLIMbus
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*
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* @drv:Client driver to be associated with client-device.
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* @owner: owning module/driver
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*
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* This API will register the client driver with the SLIMbus
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* It is called from the driver's module-init function.
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*/
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int __slim_driver_register(struct slim_driver *drv, struct module *owner)
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{
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/* ID table and probe are mandatory */
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2018-09-16 23:45:42 +00:00
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if (!(drv->driver.of_match_table || drv->id_table) || !drv->probe)
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2017-12-11 23:42:57 +00:00
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return -EINVAL;
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drv->driver.bus = &slimbus_bus;
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drv->driver.owner = owner;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(__slim_driver_register);
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/*
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* slim_driver_unregister() - Undo effect of slim_driver_register
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*
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* @drv: Client driver to be unregistered
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*/
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void slim_driver_unregister(struct slim_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(slim_driver_unregister);
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2017-12-11 23:42:58 +00:00
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static void slim_dev_release(struct device *dev)
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{
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struct slim_device *sbdev = to_slim_device(dev);
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kfree(sbdev);
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}
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static int slim_add_device(struct slim_controller *ctrl,
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struct slim_device *sbdev,
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struct device_node *node)
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{
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sbdev->dev.bus = &slimbus_bus;
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sbdev->dev.parent = ctrl->dev;
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sbdev->dev.release = slim_dev_release;
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sbdev->dev.driver = NULL;
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sbdev->ctrl = ctrl;
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2018-07-05 13:54:25 +00:00
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INIT_LIST_HEAD(&sbdev->stream_list);
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spin_lock_init(&sbdev->stream_list_lock);
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2017-12-11 23:42:58 +00:00
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2017-12-11 23:42:59 +00:00
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if (node)
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sbdev->dev.of_node = of_node_get(node);
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2017-12-11 23:42:58 +00:00
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dev_set_name(&sbdev->dev, "%x:%x:%x:%x",
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sbdev->e_addr.manf_id,
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sbdev->e_addr.prod_code,
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sbdev->e_addr.dev_index,
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sbdev->e_addr.instance);
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return device_register(&sbdev->dev);
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}
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static struct slim_device *slim_alloc_device(struct slim_controller *ctrl,
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struct slim_eaddr *eaddr,
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struct device_node *node)
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{
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struct slim_device *sbdev;
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int ret;
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sbdev = kzalloc(sizeof(*sbdev), GFP_KERNEL);
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if (!sbdev)
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return NULL;
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sbdev->e_addr = *eaddr;
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ret = slim_add_device(ctrl, sbdev, node);
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if (ret) {
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2018-03-09 14:09:59 +00:00
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put_device(&sbdev->dev);
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2017-12-11 23:42:58 +00:00
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return NULL;
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}
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return sbdev;
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}
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2017-12-11 23:42:59 +00:00
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static void of_register_slim_devices(struct slim_controller *ctrl)
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{
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struct device *dev = ctrl->dev;
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struct device_node *node;
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if (!ctrl->dev->of_node)
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return;
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for_each_child_of_node(ctrl->dev->of_node, node) {
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struct slim_device *sbdev;
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struct slim_eaddr e_addr;
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const char *compat = NULL;
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int reg[2], ret;
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int manf_id, prod_code;
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compat = of_get_property(node, "compatible", NULL);
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if (!compat)
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continue;
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ret = sscanf(compat, "slim%x,%x", &manf_id, &prod_code);
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if (ret != 2) {
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dev_err(dev, "Manf ID & Product code not found %s\n",
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compat);
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continue;
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}
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ret = of_property_read_u32_array(node, "reg", reg, 2);
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if (ret) {
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dev_err(dev, "Device and Instance id not found:%d\n",
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ret);
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continue;
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}
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e_addr.dev_index = reg[0];
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e_addr.instance = reg[1];
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e_addr.manf_id = manf_id;
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e_addr.prod_code = prod_code;
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sbdev = slim_alloc_device(ctrl, &e_addr, node);
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if (!sbdev)
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continue;
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}
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}
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2017-12-11 23:42:58 +00:00
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/*
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* slim_register_controller() - Controller bring-up and registration.
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*
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* @ctrl: Controller to be registered.
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*
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* A controller is registered with the framework using this API.
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* If devices on a controller were registered before controller,
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* this will make sure that they get probed when controller is up
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*/
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int slim_register_controller(struct slim_controller *ctrl)
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{
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int id;
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id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
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if (id < 0)
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return id;
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ctrl->id = id;
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if (!ctrl->min_cg)
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ctrl->min_cg = SLIM_MIN_CLK_GEAR;
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if (!ctrl->max_cg)
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ctrl->max_cg = SLIM_MAX_CLK_GEAR;
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ida_init(&ctrl->laddr_ida);
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idr_init(&ctrl->tid_idr);
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mutex_init(&ctrl->lock);
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2017-12-11 23:43:01 +00:00
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mutex_init(&ctrl->sched.m_reconf);
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init_completion(&ctrl->sched.pause_comp);
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2017-12-11 23:42:58 +00:00
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dev_dbg(ctrl->dev, "Bus [%s] registered:dev:%p\n",
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ctrl->name, ctrl->dev);
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2017-12-11 23:42:59 +00:00
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of_register_slim_devices(ctrl);
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2017-12-11 23:42:58 +00:00
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return 0;
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}
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EXPORT_SYMBOL_GPL(slim_register_controller);
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/* slim_remove_device: Remove the effect of slim_add_device() */
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static void slim_remove_device(struct slim_device *sbdev)
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{
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device_unregister(&sbdev->dev);
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}
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static int slim_ctrl_remove_device(struct device *dev, void *null)
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{
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slim_remove_device(to_slim_device(dev));
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return 0;
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}
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/**
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* slim_unregister_controller() - Controller tear-down.
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*
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* @ctrl: Controller to tear-down.
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*/
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int slim_unregister_controller(struct slim_controller *ctrl)
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{
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/* Remove all clients */
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device_for_each_child(ctrl->dev, NULL, slim_ctrl_remove_device);
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2017-12-11 23:43:01 +00:00
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/* Enter Clock Pause */
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slim_ctrl_clk_pause(ctrl, false, 0);
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2017-12-11 23:42:58 +00:00
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ida_simple_remove(&ctrl_ida, ctrl->id);
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return 0;
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}
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EXPORT_SYMBOL_GPL(slim_unregister_controller);
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static void slim_device_update_status(struct slim_device *sbdev,
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enum slim_device_status status)
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{
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struct slim_driver *sbdrv;
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if (sbdev->status == status)
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return;
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sbdev->status = status;
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if (!sbdev->dev.driver)
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return;
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sbdrv = to_slim_driver(sbdev->dev.driver);
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if (sbdrv->device_status)
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sbdrv->device_status(sbdev, sbdev->status);
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}
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/**
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* slim_report_absent() - Controller calls this function when a device
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* reports absent, OR when the device cannot be communicated with
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*
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* @sbdev: Device that cannot be reached, or sent report absent
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*/
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void slim_report_absent(struct slim_device *sbdev)
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{
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struct slim_controller *ctrl = sbdev->ctrl;
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if (!ctrl)
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return;
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/* invalidate logical addresses */
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mutex_lock(&ctrl->lock);
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sbdev->is_laddr_valid = false;
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mutex_unlock(&ctrl->lock);
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ida_simple_remove(&ctrl->laddr_ida, sbdev->laddr);
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slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_DOWN);
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}
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EXPORT_SYMBOL_GPL(slim_report_absent);
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static bool slim_eaddr_equal(struct slim_eaddr *a, struct slim_eaddr *b)
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{
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return (a->manf_id == b->manf_id &&
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a->prod_code == b->prod_code &&
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a->dev_index == b->dev_index &&
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a->instance == b->instance);
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}
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static int slim_match_dev(struct device *dev, void *data)
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{
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struct slim_eaddr *e_addr = data;
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struct slim_device *sbdev = to_slim_device(dev);
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return slim_eaddr_equal(&sbdev->e_addr, e_addr);
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}
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static struct slim_device *find_slim_device(struct slim_controller *ctrl,
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struct slim_eaddr *eaddr)
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{
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struct slim_device *sbdev;
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struct device *dev;
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dev = device_find_child(ctrl->dev, eaddr, slim_match_dev);
|
|
|
|
if (dev) {
|
|
|
|
sbdev = to_slim_device(dev);
|
|
|
|
return sbdev;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* slim_get_device() - get handle to a device.
|
|
|
|
*
|
|
|
|
* @ctrl: Controller on which this device will be added/queried
|
|
|
|
* @e_addr: Enumeration address of the device to be queried
|
|
|
|
*
|
|
|
|
* Return: pointer to a device if it has already reported. Creates a new
|
|
|
|
* device and returns pointer to it if the device has not yet enumerated.
|
|
|
|
*/
|
|
|
|
struct slim_device *slim_get_device(struct slim_controller *ctrl,
|
|
|
|
struct slim_eaddr *e_addr)
|
|
|
|
{
|
|
|
|
struct slim_device *sbdev;
|
|
|
|
|
|
|
|
sbdev = find_slim_device(ctrl, e_addr);
|
|
|
|
if (!sbdev) {
|
|
|
|
sbdev = slim_alloc_device(ctrl, e_addr, NULL);
|
|
|
|
if (!sbdev)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
}
|
|
|
|
|
|
|
|
return sbdev;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(slim_get_device);
|
|
|
|
|
2018-06-19 16:12:57 +00:00
|
|
|
static int of_slim_match_dev(struct device *dev, void *data)
|
|
|
|
{
|
|
|
|
struct device_node *np = data;
|
|
|
|
struct slim_device *sbdev = to_slim_device(dev);
|
|
|
|
|
|
|
|
return (sbdev->dev.of_node == np);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct slim_device *of_find_slim_device(struct slim_controller *ctrl,
|
|
|
|
struct device_node *np)
|
|
|
|
{
|
|
|
|
struct slim_device *sbdev;
|
|
|
|
struct device *dev;
|
|
|
|
|
|
|
|
dev = device_find_child(ctrl->dev, np, of_slim_match_dev);
|
|
|
|
if (dev) {
|
|
|
|
sbdev = to_slim_device(dev);
|
|
|
|
return sbdev;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* of_slim_get_device() - get handle to a device using dt node.
|
|
|
|
*
|
|
|
|
* @ctrl: Controller on which this device will be added/queried
|
|
|
|
* @np: node pointer to device
|
|
|
|
*
|
|
|
|
* Return: pointer to a device if it has already reported. Creates a new
|
|
|
|
* device and returns pointer to it if the device has not yet enumerated.
|
|
|
|
*/
|
|
|
|
struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
|
|
|
|
struct device_node *np)
|
|
|
|
{
|
|
|
|
return of_find_slim_device(ctrl, np);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(of_slim_get_device);
|
|
|
|
|
2017-12-11 23:42:58 +00:00
|
|
|
static int slim_device_alloc_laddr(struct slim_device *sbdev,
|
|
|
|
bool report_present)
|
|
|
|
{
|
|
|
|
struct slim_controller *ctrl = sbdev->ctrl;
|
|
|
|
u8 laddr;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
mutex_lock(&ctrl->lock);
|
|
|
|
if (ctrl->get_laddr) {
|
|
|
|
ret = ctrl->get_laddr(ctrl, &sbdev->e_addr, &laddr);
|
|
|
|
if (ret < 0)
|
|
|
|
goto err;
|
|
|
|
} else if (report_present) {
|
|
|
|
ret = ida_simple_get(&ctrl->laddr_ida,
|
|
|
|
0, SLIM_LA_MANAGER - 1, GFP_KERNEL);
|
|
|
|
if (ret < 0)
|
|
|
|
goto err;
|
|
|
|
|
|
|
|
laddr = ret;
|
|
|
|
} else {
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ctrl->set_laddr) {
|
|
|
|
ret = ctrl->set_laddr(ctrl, &sbdev->e_addr, laddr);
|
|
|
|
if (ret) {
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
sbdev->laddr = laddr;
|
|
|
|
sbdev->is_laddr_valid = true;
|
|
|
|
|
|
|
|
slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP);
|
|
|
|
|
|
|
|
dev_dbg(ctrl->dev, "setting slimbus l-addr:%x, ea:%x,%x,%x,%x\n",
|
|
|
|
laddr, sbdev->e_addr.manf_id, sbdev->e_addr.prod_code,
|
|
|
|
sbdev->e_addr.dev_index, sbdev->e_addr.instance);
|
|
|
|
|
|
|
|
err:
|
|
|
|
mutex_unlock(&ctrl->lock);
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* slim_device_report_present() - Report enumerated device.
|
|
|
|
*
|
|
|
|
* @ctrl: Controller with which device is enumerated.
|
|
|
|
* @e_addr: Enumeration address of the device.
|
|
|
|
* @laddr: Return logical address (if valid flag is false)
|
|
|
|
*
|
|
|
|
* Called by controller in response to REPORT_PRESENT. Framework will assign
|
|
|
|
* a logical address to this enumeration address.
|
|
|
|
* Function returns -EXFULL to indicate that all logical addresses are already
|
|
|
|
* taken.
|
|
|
|
*/
|
|
|
|
int slim_device_report_present(struct slim_controller *ctrl,
|
|
|
|
struct slim_eaddr *e_addr, u8 *laddr)
|
|
|
|
{
|
|
|
|
struct slim_device *sbdev;
|
|
|
|
int ret;
|
|
|
|
|
2017-12-11 23:43:01 +00:00
|
|
|
ret = pm_runtime_get_sync(ctrl->dev);
|
|
|
|
|
|
|
|
if (ctrl->sched.clk_state != SLIM_CLK_ACTIVE) {
|
|
|
|
dev_err(ctrl->dev, "slim ctrl not active,state:%d, ret:%d\n",
|
|
|
|
ctrl->sched.clk_state, ret);
|
|
|
|
goto slimbus_not_active;
|
|
|
|
}
|
|
|
|
|
2017-12-11 23:42:58 +00:00
|
|
|
sbdev = slim_get_device(ctrl, e_addr);
|
|
|
|
if (IS_ERR(sbdev))
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
if (sbdev->is_laddr_valid) {
|
|
|
|
*laddr = sbdev->laddr;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = slim_device_alloc_laddr(sbdev, true);
|
|
|
|
|
2017-12-11 23:43:01 +00:00
|
|
|
slimbus_not_active:
|
|
|
|
pm_runtime_mark_last_busy(ctrl->dev);
|
|
|
|
pm_runtime_put_autosuspend(ctrl->dev);
|
2017-12-11 23:42:58 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(slim_device_report_present);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* slim_get_logical_addr() - get/allocate logical address of a SLIMbus device.
|
|
|
|
*
|
|
|
|
* @sbdev: client handle requesting the address.
|
|
|
|
*
|
|
|
|
* Return: zero if a logical address is valid or a new logical address
|
|
|
|
* has been assigned. error code in case of error.
|
|
|
|
*/
|
|
|
|
int slim_get_logical_addr(struct slim_device *sbdev)
|
|
|
|
{
|
|
|
|
if (!sbdev->is_laddr_valid)
|
|
|
|
return slim_device_alloc_laddr(sbdev, false);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(slim_get_logical_addr);
|
|
|
|
|
2017-12-11 23:42:57 +00:00
|
|
|
static void __exit slimbus_exit(void)
|
|
|
|
{
|
|
|
|
bus_unregister(&slimbus_bus);
|
|
|
|
}
|
|
|
|
module_exit(slimbus_exit);
|
|
|
|
|
|
|
|
static int __init slimbus_init(void)
|
|
|
|
{
|
|
|
|
return bus_register(&slimbus_bus);
|
|
|
|
}
|
|
|
|
postcore_initcall(slimbus_init);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_DESCRIPTION("SLIMbus core");
|