[linux-2.6-block.git] / drivers / slimbus / core.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2011-2017, The Linux Foundation
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/idr.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/slimbus.h>
#include "slimbus.h"

static DEFINE_IDA(ctrl_ida);

static const struct slim_device_id *slim_match(const struct slim_device_id *id,
					       const struct slim_device *sbdev)
{
	while (id->manf_id != 0 || id->prod_code != 0) {
		if (id->manf_id == sbdev->e_addr.manf_id &&
		    id->prod_code == sbdev->e_addr.prod_code)
			return id;
		id++;
	}
	return NULL;
}

static int slim_device_match(struct device *dev, struct device_driver *drv)
{
	struct slim_device *sbdev = to_slim_device(dev);
	struct slim_driver *sbdrv = to_slim_driver(drv);

	/* Attempt an OF style match first */
	if (of_driver_match_device(dev, drv))
		return 1;

	return !!slim_match(sbdrv->id_table, sbdev);
}

static int slim_device_probe(struct device *dev)
{
	struct slim_device	*sbdev = to_slim_device(dev);
	struct slim_driver	*sbdrv = to_slim_driver(dev->driver);
	int ret;

	ret = sbdrv->probe(sbdev);
	if (ret)
		return ret;

	/* try getting the logical address after probe */
	ret = slim_get_logical_addr(sbdev);
	if (!ret) {
		if (sbdrv->device_status)
			sbdrv->device_status(sbdev, sbdev->status);
	} else {
		dev_err(&sbdev->dev, "Failed to get logical address\n");
		ret = -EPROBE_DEFER;
	}

	return ret;
}

static int slim_device_remove(struct device *dev)
{
	struct slim_device *sbdev = to_slim_device(dev);
	struct slim_driver *sbdrv;

	if (dev->driver) {
		sbdrv = to_slim_driver(dev->driver);
		if (sbdrv->remove)
			sbdrv->remove(sbdev);
	}

	return 0;
}

static int slim_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct slim_device *sbdev = to_slim_device(dev);
	int ret;

	ret = of_device_uevent_modalias(dev, env);
	if (ret != -ENODEV)
		return ret;

	return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev));
}

struct bus_type slimbus_bus = {
	.name		= "slimbus",
	.match		= slim_device_match,
	.probe		= slim_device_probe,
	.remove		= slim_device_remove,
	.uevent		= slim_device_uevent,
};
EXPORT_SYMBOL_GPL(slimbus_bus);

/*
 * __slim_driver_register() - Client driver registration with SLIMbus
 *
 * @drv:Client driver to be associated with client-device.
 * @owner: owning module/driver
 *
 * This API will register the client driver with the SLIMbus
 * It is called from the driver's module-init function.
 */
int __slim_driver_register(struct slim_driver *drv, struct module *owner)
{
	/* ID table and probe are mandatory */
	if (!(drv->driver.of_match_table || drv->id_table) || !drv->probe)
		return -EINVAL;

	drv->driver.bus = &slimbus_bus;
	drv->driver.owner = owner;

	return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(__slim_driver_register);

/*
 * slim_driver_unregister() - Undo effect of slim_driver_register
 *
 * @drv: Client driver to be unregistered
 */
void slim_driver_unregister(struct slim_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(slim_driver_unregister);

static void slim_dev_release(struct device *dev)
{
	struct slim_device *sbdev = to_slim_device(dev);

	kfree(sbdev);
}

static int slim_add_device(struct slim_controller *ctrl,
			   struct slim_device *sbdev,
			   struct device_node *node)
{
	sbdev->dev.bus = &slimbus_bus;
	sbdev->dev.parent = ctrl->dev;
	sbdev->dev.release = slim_dev_release;
	sbdev->dev.driver = NULL;
	sbdev->ctrl = ctrl;
	INIT_LIST_HEAD(&sbdev->stream_list);
	spin_lock_init(&sbdev->stream_list_lock);

	if (node)
		sbdev->dev.of_node = of_node_get(node);

	dev_set_name(&sbdev->dev, "%x:%x:%x:%x",
				  sbdev->e_addr.manf_id,
				  sbdev->e_addr.prod_code,
				  sbdev->e_addr.dev_index,
				  sbdev->e_addr.instance);

	return device_register(&sbdev->dev);
}

static struct slim_device *slim_alloc_device(struct slim_controller *ctrl,
					     struct slim_eaddr *eaddr,
					     struct device_node *node)
{
	struct slim_device *sbdev;
	int ret;

	sbdev = kzalloc(sizeof(*sbdev), GFP_KERNEL);
	if (!sbdev)
		return NULL;

	sbdev->e_addr = *eaddr;
	ret = slim_add_device(ctrl, sbdev, node);
	if (ret) {
		put_device(&sbdev->dev);
		return NULL;
	}

	return sbdev;
}

static void of_register_slim_devices(struct slim_controller *ctrl)
{
	struct device *dev = ctrl->dev;
	struct device_node *node;

	if (!ctrl->dev->of_node)
		return;

	for_each_child_of_node(ctrl->dev->of_node, node) {
		struct slim_device *sbdev;
		struct slim_eaddr e_addr;
		const char *compat = NULL;
		int reg[2], ret;
		int manf_id, prod_code;

		compat = of_get_property(node, "compatible", NULL);
		if (!compat)
			continue;

		ret = sscanf(compat, "slim%x,%x", &manf_id, &prod_code);
		if (ret != 2) {
			dev_err(dev, "Manf ID & Product code not found %s\n",
				compat);
			continue;
		}

		ret = of_property_read_u32_array(node, "reg", reg, 2);
		if (ret) {
			dev_err(dev, "Device and Instance id not found:%d\n",
				ret);
			continue;
		}

		e_addr.dev_index = reg[0];
		e_addr.instance = reg[1];
		e_addr.manf_id = manf_id;
		e_addr.prod_code = prod_code;

		sbdev = slim_alloc_device(ctrl, &e_addr, node);
		if (!sbdev)
			continue;
	}
}

/*
 * slim_register_controller() - Controller bring-up and registration.
 *
 * @ctrl: Controller to be registered.
 *
 * A controller is registered with the framework using this API.
 * If devices on a controller were registered before controller,
 * this will make sure that they get probed when controller is up
 */
int slim_register_controller(struct slim_controller *ctrl)
{
	int id;

	id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
	if (id < 0)
		return id;

	ctrl->id = id;

	if (!ctrl->min_cg)
		ctrl->min_cg = SLIM_MIN_CLK_GEAR;
	if (!ctrl->max_cg)
		ctrl->max_cg = SLIM_MAX_CLK_GEAR;

	ida_init(&ctrl->laddr_ida);
	idr_init(&ctrl->tid_idr);
	mutex_init(&ctrl->lock);
	mutex_init(&ctrl->sched.m_reconf);
	init_completion(&ctrl->sched.pause_comp);

	dev_dbg(ctrl->dev, "Bus [%s] registered:dev:%p\n",
		ctrl->name, ctrl->dev);

	of_register_slim_devices(ctrl);

	return 0;
}
EXPORT_SYMBOL_GPL(slim_register_controller);

/* slim_remove_device: Remove the effect of slim_add_device() */
static void slim_remove_device(struct slim_device *sbdev)
{
	device_unregister(&sbdev->dev);
}

static int slim_ctrl_remove_device(struct device *dev, void *null)
{
	slim_remove_device(to_slim_device(dev));
	return 0;
}

/**
 * slim_unregister_controller() - Controller tear-down.
 *
 * @ctrl: Controller to tear-down.
 */
int slim_unregister_controller(struct slim_controller *ctrl)
{
	/* Remove all clients */
	device_for_each_child(ctrl->dev, NULL, slim_ctrl_remove_device);
	/* Enter Clock Pause */
	slim_ctrl_clk_pause(ctrl, false, 0);
	ida_simple_remove(&ctrl_ida, ctrl->id);

	return 0;
}
EXPORT_SYMBOL_GPL(slim_unregister_controller);

static void slim_device_update_status(struct slim_device *sbdev,
				      enum slim_device_status status)
{
	struct slim_driver *sbdrv;

	if (sbdev->status == status)
		return;

	sbdev->status = status;
	if (!sbdev->dev.driver)
		return;

	sbdrv = to_slim_driver(sbdev->dev.driver);
	if (sbdrv->device_status)
		sbdrv->device_status(sbdev, sbdev->status);
}

/**
 * slim_report_absent() - Controller calls this function when a device
 *	reports absent, OR when the device cannot be communicated with
 *
 * @sbdev: Device that cannot be reached, or sent report absent
 */
void slim_report_absent(struct slim_device *sbdev)
{
	struct slim_controller *ctrl = sbdev->ctrl;

	if (!ctrl)
		return;

	/* invalidate logical addresses */
	mutex_lock(&ctrl->lock);
	sbdev->is_laddr_valid = false;
	mutex_unlock(&ctrl->lock);

	ida_simple_remove(&ctrl->laddr_ida, sbdev->laddr);
	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_DOWN);
}
EXPORT_SYMBOL_GPL(slim_report_absent);

static bool slim_eaddr_equal(struct slim_eaddr *a, struct slim_eaddr *b)
{
	return (a->manf_id == b->manf_id &&
		a->prod_code == b->prod_code &&
		a->dev_index == b->dev_index &&
		a->instance == b->instance);
}

static int slim_match_dev(struct device *dev, void *data)
{
	struct slim_eaddr *e_addr = data;
	struct slim_device *sbdev = to_slim_device(dev);

	return slim_eaddr_equal(&sbdev->e_addr, e_addr);
}

static struct slim_device *find_slim_device(struct slim_controller *ctrl,
					    struct slim_eaddr *eaddr)
{
	struct slim_device *sbdev;
	struct device *dev;

	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);

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);

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;

	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;
	}

	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);

slimbus_not_active:
	pm_runtime_mark_last_busy(ctrl->dev);
	pm_runtime_put_autosuspend(ctrl->dev);
	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);

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");
Commit	Line	Data
3648e78e SD	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (c) 2011-2017, The Linux Foundation
	4	*/
	5
	6	#include <linux/kernel.h>
	7	#include <linux/errno.h>
	8	#include <linux/slab.h>
	9	#include <linux/init.h>
46a2bb5a	10	#include <linux/idr.h>
7588a511	11	#include <linux/of.h>
9e663f48	12	#include <linux/of_device.h>
4b14e62a	13	#include <linux/pm_runtime.h>
3648e78e	14	#include <linux/slimbus.h>
46a2bb5a SD	15	#include "slimbus.h"
	16
	17	static DEFINE_IDA(ctrl_ida);
3648e78e SD	18
	19	static const struct slim_device_id slim_match(const struct slim_device_id id,
	20	const struct slim_device *sbdev)
	21	{
	22	while (id->manf_id != 0 \|\| id->prod_code != 0) {
	23	if (id->manf_id == sbdev->e_addr.manf_id &&
	24	id->prod_code == sbdev->e_addr.prod_code)
	25	return id;
	26	id++;
	27	}
	28	return NULL;
	29	}
	30
	31	static int slim_device_match(struct device dev, struct device_driver drv)
	32	{
	33	struct slim_device *sbdev = to_slim_device(dev);
	34	struct slim_driver *sbdrv = to_slim_driver(drv);
	35
14a649d3 SK	36	/* Attempt an OF style match first */
	37	if (of_driver_match_device(dev, drv))
	38	return 1;
	39
3648e78e SD	40	return !!slim_match(sbdrv->id_table, sbdev);
	41	}
	42
	43	static int slim_device_probe(struct device *dev)
	44	{
	45	struct slim_device *sbdev = to_slim_device(dev);
	46	struct slim_driver *sbdrv = to_slim_driver(dev->driver);
8f3d5fcd	47	int ret;
3648e78e	48
8f3d5fcd SK	49	ret = sbdrv->probe(sbdev);
	50	if (ret)
	51	return ret;
	52
	53	/* try getting the logical address after probe */
	54	ret = slim_get_logical_addr(sbdev);
	55	if (!ret) {
	56	if (sbdrv->device_status)
	57	sbdrv->device_status(sbdev, sbdev->status);
	58	} else {
	59	dev_err(&sbdev->dev, "Failed to get logical address\n");
	60	ret = -EPROBE_DEFER;
	61	}
	62
	63	return ret;
3648e78e SD	64	}
	65
	66	static int slim_device_remove(struct device *dev)
	67	{
	68	struct slim_device *sbdev = to_slim_device(dev);
	69	struct slim_driver *sbdrv;
	70
	71	if (dev->driver) {
	72	sbdrv = to_slim_driver(dev->driver);
	73	if (sbdrv->remove)
	74	sbdrv->remove(sbdev);
	75	}
	76
	77	return 0;
	78	}
	79
9e663f48 SK	80	static int slim_device_uevent(struct device dev, struct kobj_uevent_env env)
	81	{
	82	struct slim_device *sbdev = to_slim_device(dev);
	83	int ret;
	84
	85	ret = of_device_uevent_modalias(dev, env);
	86	if (ret != -ENODEV)
	87	return ret;
	88
	89	return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev));
	90	}
	91
3648e78e SD	92	struct bus_type slimbus_bus = {
	93	.name = "slimbus",
	94	.match = slim_device_match,
	95	.probe = slim_device_probe,
	96	.remove = slim_device_remove,
9e663f48	97	.uevent = slim_device_uevent,
3648e78e SD	98	};
	99	EXPORT_SYMBOL_GPL(slimbus_bus);
	100
	101	/*
	102	* __slim_driver_register() - Client driver registration with SLIMbus
	103	*
	104	* @drv:Client driver to be associated with client-device.
	105	* @owner: owning module/driver
	106	*
	107	* This API will register the client driver with the SLIMbus
	108	* It is called from the driver's module-init function.
	109	*/
	110	int __slim_driver_register(struct slim_driver drv, struct module owner)
	111	{
	112	/* ID table and probe are mandatory */
14a649d3	113	if (!(drv->driver.of_match_table \|\| drv->id_table) \|\| !drv->probe)
3648e78e SD	114	return -EINVAL;
	115
	116	drv->driver.bus = &slimbus_bus;
	117	drv->driver.owner = owner;
	118
	119	return driver_register(&drv->driver);
	120	}
	121	EXPORT_SYMBOL_GPL(__slim_driver_register);
	122
	123	/*
	124	* slim_driver_unregister() - Undo effect of slim_driver_register
	125	*
	126	* @drv: Client driver to be unregistered
	127	*/
	128	void slim_driver_unregister(struct slim_driver *drv)
	129	{
	130	driver_unregister(&drv->driver);
	131	}
	132	EXPORT_SYMBOL_GPL(slim_driver_unregister);
	133
46a2bb5a SD	134	static void slim_dev_release(struct device *dev)
	135	{
	136	struct slim_device *sbdev = to_slim_device(dev);
	137
	138	kfree(sbdev);
	139	}
	140
	141	static int slim_add_device(struct slim_controller *ctrl,
	142	struct slim_device *sbdev,
	143	struct device_node *node)
	144	{
	145	sbdev->dev.bus = &slimbus_bus;
	146	sbdev->dev.parent = ctrl->dev;
	147	sbdev->dev.release = slim_dev_release;
	148	sbdev->dev.driver = NULL;
	149	sbdev->ctrl = ctrl;
abb9c9b8 SK	150	INIT_LIST_HEAD(&sbdev->stream_list);
abb9c9b8 SK	151	spin_lock_init(&sbdev->stream_list_lock);
46a2bb5a	152
7588a511 SK	153	if (node)
	154	sbdev->dev.of_node = of_node_get(node);
	155
46a2bb5a SD	156	dev_set_name(&sbdev->dev, "%x:%x:%x:%x",
	157	sbdev->e_addr.manf_id,
	158	sbdev->e_addr.prod_code,
	159	sbdev->e_addr.dev_index,
	160	sbdev->e_addr.instance);
	161
	162	return device_register(&sbdev->dev);
	163	}
	164
	165	static struct slim_device slim_alloc_device(struct slim_controller ctrl,
	166	struct slim_eaddr *eaddr,
	167	struct device_node *node)
	168	{
	169	struct slim_device *sbdev;
	170	int ret;
	171
	172	sbdev = kzalloc(sizeof(*sbdev), GFP_KERNEL);
	173	if (!sbdev)
	174	return NULL;
	175
	176	sbdev->e_addr = *eaddr;
	177	ret = slim_add_device(ctrl, sbdev, node);
	178	if (ret) {
bd329f02	179	put_device(&sbdev->dev);
46a2bb5a SD	180	return NULL;
	181	}
	182
	183	return sbdev;
	184	}
	185
7588a511 SK	186	static void of_register_slim_devices(struct slim_controller *ctrl)
	187	{
	188	struct device *dev = ctrl->dev;
	189	struct device_node *node;
	190
	191	if (!ctrl->dev->of_node)
	192	return;
	193
	194	for_each_child_of_node(ctrl->dev->of_node, node) {
	195	struct slim_device *sbdev;
	196	struct slim_eaddr e_addr;
	197	const char *compat = NULL;
	198	int reg[2], ret;
	199	int manf_id, prod_code;
	200
	201	compat = of_get_property(node, "compatible", NULL);
	202	if (!compat)
	203	continue;
	204
	205	ret = sscanf(compat, "slim%x,%x", &manf_id, &prod_code);
	206	if (ret != 2) {
	207	dev_err(dev, "Manf ID & Product code not found %s\n",
	208	compat);
	209	continue;
	210	}
	211
	212	ret = of_property_read_u32_array(node, "reg", reg, 2);
	213	if (ret) {
	214	dev_err(dev, "Device and Instance id not found:%d\n",
	215	ret);
	216	continue;
	217	}
	218
	219	e_addr.dev_index = reg[0];
	220	e_addr.instance = reg[1];
	221	e_addr.manf_id = manf_id;
	222	e_addr.prod_code = prod_code;
	223
	224	sbdev = slim_alloc_device(ctrl, &e_addr, node);
	225	if (!sbdev)
	226	continue;
	227	}
	228	}
	229
46a2bb5a SD	230	/*
	231	* slim_register_controller() - Controller bring-up and registration.
	232	*
	233	* @ctrl: Controller to be registered.
	234	*
	235	* A controller is registered with the framework using this API.
	236	* If devices on a controller were registered before controller,
	237	* this will make sure that they get probed when controller is up
	238	*/
	239	int slim_register_controller(struct slim_controller *ctrl)
	240	{
	241	int id;
	242
	243	id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
	244	if (id < 0)
	245	return id;
	246
	247	ctrl->id = id;
	248
	249	if (!ctrl->min_cg)
	250	ctrl->min_cg = SLIM_MIN_CLK_GEAR;
	251	if (!ctrl->max_cg)
	252	ctrl->max_cg = SLIM_MAX_CLK_GEAR;
	253
	254	ida_init(&ctrl->laddr_ida);
	255	idr_init(&ctrl->tid_idr);
	256	mutex_init(&ctrl->lock);
4b14e62a SD	257	mutex_init(&ctrl->sched.m_reconf);
4b14e62a SD	258	init_completion(&ctrl->sched.pause_comp);
46a2bb5a SD	259
	260	dev_dbg(ctrl->dev, "Bus [%s] registered:dev:%p\n",
	261	ctrl->name, ctrl->dev);
	262
7588a511 SK	263	of_register_slim_devices(ctrl);
7588a511 SK	264
46a2bb5a SD	265	return 0;
	266	}
	267	EXPORT_SYMBOL_GPL(slim_register_controller);
	268
	269	/* slim_remove_device: Remove the effect of slim_add_device() */
	270	static void slim_remove_device(struct slim_device *sbdev)
	271	{
	272	device_unregister(&sbdev->dev);
	273	}
	274
	275	static int slim_ctrl_remove_device(struct device dev, void null)
	276	{
	277	slim_remove_device(to_slim_device(dev));
	278	return 0;
	279	}
	280
	281	/**
	282	* slim_unregister_controller() - Controller tear-down.
	283	*
	284	* @ctrl: Controller to tear-down.
	285	*/
	286	int slim_unregister_controller(struct slim_controller *ctrl)
	287	{
	288	/* Remove all clients */
	289	device_for_each_child(ctrl->dev, NULL, slim_ctrl_remove_device);
4b14e62a SD	290	/* Enter Clock Pause */
4b14e62a SD	291	slim_ctrl_clk_pause(ctrl, false, 0);
46a2bb5a SD	292	ida_simple_remove(&ctrl_ida, ctrl->id);
	293
	294	return 0;
	295	}
	296	EXPORT_SYMBOL_GPL(slim_unregister_controller);
	297
	298	static void slim_device_update_status(struct slim_device *sbdev,
	299	enum slim_device_status status)
	300	{
	301	struct slim_driver *sbdrv;
	302
	303	if (sbdev->status == status)
	304	return;
	305
	306	sbdev->status = status;
	307	if (!sbdev->dev.driver)
	308	return;
	309
	310	sbdrv = to_slim_driver(sbdev->dev.driver);
	311	if (sbdrv->device_status)
	312	sbdrv->device_status(sbdev, sbdev->status);
	313	}
	314
	315	/**
	316	* slim_report_absent() - Controller calls this function when a device
	317	* reports absent, OR when the device cannot be communicated with
	318	*
	319	* @sbdev: Device that cannot be reached, or sent report absent
	320	*/
	321	void slim_report_absent(struct slim_device *sbdev)
	322	{
	323	struct slim_controller *ctrl = sbdev->ctrl;
	324
	325	if (!ctrl)
	326	return;
	327
	328	/* invalidate logical addresses */
	329	mutex_lock(&ctrl->lock);
	330	sbdev->is_laddr_valid = false;
	331	mutex_unlock(&ctrl->lock);
	332
	333	ida_simple_remove(&ctrl->laddr_ida, sbdev->laddr);
	334	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_DOWN);
	335	}
	336	EXPORT_SYMBOL_GPL(slim_report_absent);
	337
	338	static bool slim_eaddr_equal(struct slim_eaddr a, struct slim_eaddr b)
	339	{
	340	return (a->manf_id == b->manf_id &&
	341	a->prod_code == b->prod_code &&
	342	a->dev_index == b->dev_index &&
	343	a->instance == b->instance);
	344	}
	345
	346	static int slim_match_dev(struct device dev, void data)
	347	{
	348	struct slim_eaddr *e_addr = data;
	349	struct slim_device *sbdev = to_slim_device(dev);
	350
	351	return slim_eaddr_equal(&sbdev->e_addr, e_addr);
	352	}
	353
	354	static struct slim_device find_slim_device(struct slim_controller ctrl,
	355	struct slim_eaddr *eaddr)
356	{
357	struct slim_device *sbdev;
358	struct device *dev;
359
360	dev = device_find_child(ctrl->dev, eaddr, slim_match_dev);
361	if (dev) {
362	sbdev = to_slim_device(dev);
363	return sbdev;
364	}
365
366	return NULL;
367	}
368
369	/**
370	* slim_get_device() - get handle to a device.
371	*
372	* @ctrl: Controller on which this device will be added/queried
373	* @e_addr: Enumeration address of the device to be queried
374	*
375	* Return: pointer to a device if it has already reported. Creates a new
376	* device and returns pointer to it if the device has not yet enumerated.
377	*/
378	struct slim_device slim_get_device(struct slim_controller ctrl,
379	struct slim_eaddr *e_addr)
380	{
381	struct slim_device *sbdev;
382
383	sbdev = find_slim_device(ctrl, e_addr);
384	if (!sbdev) {
385	sbdev = slim_alloc_device(ctrl, e_addr, NULL);
386	if (!sbdev)
387	return ERR_PTR(-ENOMEM);
388	}
389
390	return sbdev;
391	}
392	EXPORT_SYMBOL_GPL(slim_get_device);
393
e0772de8 SK	394	static int of_slim_match_dev(struct device dev, void data)
	395	{
	396	struct device_node *np = data;
	397	struct slim_device *sbdev = to_slim_device(dev);
	398
	399	return (sbdev->dev.of_node == np);
	400	}
	401
	402	static struct slim_device of_find_slim_device(struct slim_controller ctrl,
	403	struct device_node *np)
	404	{
	405	struct slim_device *sbdev;
	406	struct device *dev;
	407
	408	dev = device_find_child(ctrl->dev, np, of_slim_match_dev);
	409	if (dev) {
	410	sbdev = to_slim_device(dev);
	411	return sbdev;
	412	}
	413
	414	return NULL;
	415	}
	416
	417	/**
	418	* of_slim_get_device() - get handle to a device using dt node.
	419	*
	420	* @ctrl: Controller on which this device will be added/queried
	421	* @np: node pointer to device
	422	*
	423	* Return: pointer to a device if it has already reported. Creates a new
	424	* device and returns pointer to it if the device has not yet enumerated.
	425	*/
	426	struct slim_device of_slim_get_device(struct slim_controller ctrl,
	427	struct device_node *np)
	428	{
	429	return of_find_slim_device(ctrl, np);
	430	}
	431	EXPORT_SYMBOL_GPL(of_slim_get_device);
	432
46a2bb5a SD	433	static int slim_device_alloc_laddr(struct slim_device *sbdev,
	434	bool report_present)
	435	{
	436	struct slim_controller *ctrl = sbdev->ctrl;
	437	u8 laddr;
	438	int ret;
	439
	440	mutex_lock(&ctrl->lock);
	441	if (ctrl->get_laddr) {
	442	ret = ctrl->get_laddr(ctrl, &sbdev->e_addr, &laddr);
	443	if (ret < 0)
	444	goto err;
	445	} else if (report_present) {
	446	ret = ida_simple_get(&ctrl->laddr_ida,
	447	0, SLIM_LA_MANAGER - 1, GFP_KERNEL);
	448	if (ret < 0)
	449	goto err;
	450
	451	laddr = ret;
	452	} else {
	453	ret = -EINVAL;
	454	goto err;
	455	}
	456
	457	if (ctrl->set_laddr) {
	458	ret = ctrl->set_laddr(ctrl, &sbdev->e_addr, laddr);
	459	if (ret) {
	460	ret = -EINVAL;
	461	goto err;
	462	}
	463	}
	464
	465	sbdev->laddr = laddr;
	466	sbdev->is_laddr_valid = true;
	467
	468	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP);
	469
	470	dev_dbg(ctrl->dev, "setting slimbus l-addr:%x, ea:%x,%x,%x,%x\n",
	471	laddr, sbdev->e_addr.manf_id, sbdev->e_addr.prod_code,
	472	sbdev->e_addr.dev_index, sbdev->e_addr.instance);
	473
	474	err:
	475	mutex_unlock(&ctrl->lock);
	476	return ret;
	477
	478	}
	479
	480	/**
	481	* slim_device_report_present() - Report enumerated device.
	482	*
	483	* @ctrl: Controller with which device is enumerated.
	484	* @e_addr: Enumeration address of the device.
	485	* @laddr: Return logical address (if valid flag is false)
	486	*
	487	* Called by controller in response to REPORT_PRESENT. Framework will assign
	488	* a logical address to this enumeration address.
	489	* Function returns -EXFULL to indicate that all logical addresses are already
	490	* taken.
	491	*/
	492	int slim_device_report_present(struct slim_controller *ctrl,
	493	struct slim_eaddr e_addr, u8 laddr)
	494	{
	495	struct slim_device *sbdev;
	496	int ret;
497
4b14e62a SD	498	ret = pm_runtime_get_sync(ctrl->dev);
	499
	500	if (ctrl->sched.clk_state != SLIM_CLK_ACTIVE) {
	501	dev_err(ctrl->dev, "slim ctrl not active,state:%d, ret:%d\n",
	502	ctrl->sched.clk_state, ret);
	503	goto slimbus_not_active;
	504	}
	505
46a2bb5a SD	506	sbdev = slim_get_device(ctrl, e_addr);
	507	if (IS_ERR(sbdev))
	508	return -ENODEV;
	509
	510	if (sbdev->is_laddr_valid) {
	511	*laddr = sbdev->laddr;
	512	return 0;
	513	}
	514
	515	ret = slim_device_alloc_laddr(sbdev, true);
	516
4b14e62a SD	517	slimbus_not_active:
	518	pm_runtime_mark_last_busy(ctrl->dev);
	519	pm_runtime_put_autosuspend(ctrl->dev);
46a2bb5a SD	520	return ret;
	521	}
	522	EXPORT_SYMBOL_GPL(slim_device_report_present);
	523
	524	/**
	525	* slim_get_logical_addr() - get/allocate logical address of a SLIMbus device.
	526	*
	527	* @sbdev: client handle requesting the address.
	528	*
	529	* Return: zero if a logical address is valid or a new logical address
	530	* has been assigned. error code in case of error.
	531	*/
	532	int slim_get_logical_addr(struct slim_device *sbdev)
	533	{
	534	if (!sbdev->is_laddr_valid)
	535	return slim_device_alloc_laddr(sbdev, false);
	536
	537	return 0;
	538	}
	539	EXPORT_SYMBOL_GPL(slim_get_logical_addr);
	540
3648e78e SD	541	static void __exit slimbus_exit(void)
	542	{
	543	bus_unregister(&slimbus_bus);
	544	}
	545	module_exit(slimbus_exit);
	546
	547	static int __init slimbus_init(void)
	548	{
	549	return bus_register(&slimbus_bus);
	550	}
	551	postcore_initcall(slimbus_init);
	552
	553	MODULE_LICENSE("GPL v2");
	554	MODULE_DESCRIPTION("SLIMbus core");