[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 &&
		    id->dev_index == sbdev->e_addr.dev_index &&
		    id->instance == sbdev->e_addr.instance)
			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 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);
}

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) {
		slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP);
	} 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);
	spin_lock_init(&ctrl->txn_lock);

	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);

/**
 * 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;
	mutex_unlock(&ctrl->lock);

	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);

	return 0;

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 &&
8631f940 SK	24	id->prod_code == sbdev->e_addr.prod_code &&
	25	id->dev_index == sbdev->e_addr.dev_index &&
	26	id->instance == sbdev->e_addr.instance)
3648e78e SD	27	return id;
	28	id++;
	29	}
	30	return NULL;
	31	}
	32
	33	static int slim_device_match(struct device dev, struct device_driver drv)
	34	{
	35	struct slim_device *sbdev = to_slim_device(dev);
	36	struct slim_driver *sbdrv = to_slim_driver(drv);
	37
14a649d3 SK	38	/* Attempt an OF style match first */
	39	if (of_driver_match_device(dev, drv))
	40	return 1;
	41
3648e78e SD	42	return !!slim_match(sbdrv->id_table, sbdev);
	43	}
	44
380c6246 SK	45	static void slim_device_update_status(struct slim_device *sbdev,
	46	enum slim_device_status status)
	47	{
	48	struct slim_driver *sbdrv;
	49
	50	if (sbdev->status == status)
	51	return;
	52
	53	sbdev->status = status;
	54	if (!sbdev->dev.driver)
	55	return;
	56
	57	sbdrv = to_slim_driver(sbdev->dev.driver);
	58	if (sbdrv->device_status)
	59	sbdrv->device_status(sbdev, sbdev->status);
	60	}
	61
3648e78e SD	62	static int slim_device_probe(struct device *dev)
	63	{
	64	struct slim_device *sbdev = to_slim_device(dev);
	65	struct slim_driver *sbdrv = to_slim_driver(dev->driver);
8f3d5fcd	66	int ret;
3648e78e	67
8f3d5fcd SK	68	ret = sbdrv->probe(sbdev);
	69	if (ret)
	70	return ret;
	71
	72	/* try getting the logical address after probe */
	73	ret = slim_get_logical_addr(sbdev);
	74	if (!ret) {
380c6246	75	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP);
8f3d5fcd SK	76	} else {
	77	dev_err(&sbdev->dev, "Failed to get logical address\n");
	78	ret = -EPROBE_DEFER;
	79	}
	80
	81	return ret;
3648e78e SD	82	}
	83
	84	static int slim_device_remove(struct device *dev)
	85	{
	86	struct slim_device *sbdev = to_slim_device(dev);
	87	struct slim_driver *sbdrv;
	88
	89	if (dev->driver) {
	90	sbdrv = to_slim_driver(dev->driver);
	91	if (sbdrv->remove)
	92	sbdrv->remove(sbdev);
	93	}
	94
	95	return 0;
	96	}
	97
9e663f48 SK	98	static int slim_device_uevent(struct device dev, struct kobj_uevent_env env)
	99	{
	100	struct slim_device *sbdev = to_slim_device(dev);
	101	int ret;
	102
	103	ret = of_device_uevent_modalias(dev, env);
	104	if (ret != -ENODEV)
	105	return ret;
	106
	107	return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev));
	108	}
	109
3648e78e SD	110	struct bus_type slimbus_bus = {
	111	.name = "slimbus",
	112	.match = slim_device_match,
	113	.probe = slim_device_probe,
	114	.remove = slim_device_remove,
9e663f48	115	.uevent = slim_device_uevent,
3648e78e SD	116	};
	117	EXPORT_SYMBOL_GPL(slimbus_bus);
	118
	119	/*
	120	* __slim_driver_register() - Client driver registration with SLIMbus
	121	*
	122	* @drv:Client driver to be associated with client-device.
	123	* @owner: owning module/driver
	124	*
	125	* This API will register the client driver with the SLIMbus
	126	* It is called from the driver's module-init function.
	127	*/
	128	int __slim_driver_register(struct slim_driver drv, struct module owner)
	129	{
	130	/* ID table and probe are mandatory */
14a649d3	131	if (!(drv->driver.of_match_table \|\| drv->id_table) \|\| !drv->probe)
3648e78e SD	132	return -EINVAL;
	133
	134	drv->driver.bus = &slimbus_bus;
	135	drv->driver.owner = owner;
	136
	137	return driver_register(&drv->driver);
	138	}
	139	EXPORT_SYMBOL_GPL(__slim_driver_register);
	140
	141	/*
	142	* slim_driver_unregister() - Undo effect of slim_driver_register
	143	*
	144	* @drv: Client driver to be unregistered
	145	*/
	146	void slim_driver_unregister(struct slim_driver *drv)
	147	{
	148	driver_unregister(&drv->driver);
	149	}
	150	EXPORT_SYMBOL_GPL(slim_driver_unregister);
	151
46a2bb5a SD	152	static void slim_dev_release(struct device *dev)
	153	{
	154	struct slim_device *sbdev = to_slim_device(dev);
	155
	156	kfree(sbdev);
	157	}
	158
	159	static int slim_add_device(struct slim_controller *ctrl,
	160	struct slim_device *sbdev,
	161	struct device_node *node)
	162	{
	163	sbdev->dev.bus = &slimbus_bus;
	164	sbdev->dev.parent = ctrl->dev;
	165	sbdev->dev.release = slim_dev_release;
	166	sbdev->dev.driver = NULL;
	167	sbdev->ctrl = ctrl;
abb9c9b8 SK	168	INIT_LIST_HEAD(&sbdev->stream_list);
abb9c9b8 SK	169	spin_lock_init(&sbdev->stream_list_lock);
46a2bb5a	170
7588a511 SK	171	if (node)
	172	sbdev->dev.of_node = of_node_get(node);
	173
46a2bb5a SD	174	dev_set_name(&sbdev->dev, "%x:%x:%x:%x",
	175	sbdev->e_addr.manf_id,
	176	sbdev->e_addr.prod_code,
	177	sbdev->e_addr.dev_index,
	178	sbdev->e_addr.instance);
	179
	180	return device_register(&sbdev->dev);
	181	}
	182
	183	static struct slim_device slim_alloc_device(struct slim_controller ctrl,
	184	struct slim_eaddr *eaddr,
	185	struct device_node *node)
	186	{
	187	struct slim_device *sbdev;
	188	int ret;
	189
	190	sbdev = kzalloc(sizeof(*sbdev), GFP_KERNEL);
	191	if (!sbdev)
	192	return NULL;
	193
	194	sbdev->e_addr = *eaddr;
	195	ret = slim_add_device(ctrl, sbdev, node);
	196	if (ret) {
bd329f02	197	put_device(&sbdev->dev);
46a2bb5a SD	198	return NULL;
	199	}
	200
	201	return sbdev;
	202	}
	203
7588a511 SK	204	static void of_register_slim_devices(struct slim_controller *ctrl)
	205	{
	206	struct device *dev = ctrl->dev;
	207	struct device_node *node;
	208
	209	if (!ctrl->dev->of_node)
	210	return;
	211
	212	for_each_child_of_node(ctrl->dev->of_node, node) {
	213	struct slim_device *sbdev;
	214	struct slim_eaddr e_addr;
	215	const char *compat = NULL;
	216	int reg[2], ret;
	217	int manf_id, prod_code;
	218
	219	compat = of_get_property(node, "compatible", NULL);
	220	if (!compat)
	221	continue;
	222
	223	ret = sscanf(compat, "slim%x,%x", &manf_id, &prod_code);
	224	if (ret != 2) {
	225	dev_err(dev, "Manf ID & Product code not found %s\n",
	226	compat);
	227	continue;
	228	}
	229
	230	ret = of_property_read_u32_array(node, "reg", reg, 2);
	231	if (ret) {
	232	dev_err(dev, "Device and Instance id not found:%d\n",
	233	ret);
	234	continue;
	235	}
	236
	237	e_addr.dev_index = reg[0];
	238	e_addr.instance = reg[1];
	239	e_addr.manf_id = manf_id;
	240	e_addr.prod_code = prod_code;
	241
	242	sbdev = slim_alloc_device(ctrl, &e_addr, node);
	243	if (!sbdev)
	244	continue;
	245	}
	246	}
	247
46a2bb5a SD	248	/*
	249	* slim_register_controller() - Controller bring-up and registration.
	250	*
	251	* @ctrl: Controller to be registered.
	252	*
	253	* A controller is registered with the framework using this API.
	254	* If devices on a controller were registered before controller,
	255	* this will make sure that they get probed when controller is up
	256	*/
	257	int slim_register_controller(struct slim_controller *ctrl)
	258	{
	259	int id;
	260
	261	id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
	262	if (id < 0)
	263	return id;
	264
	265	ctrl->id = id;
	266
	267	if (!ctrl->min_cg)
	268	ctrl->min_cg = SLIM_MIN_CLK_GEAR;
	269	if (!ctrl->max_cg)
	270	ctrl->max_cg = SLIM_MAX_CLK_GEAR;
	271
	272	ida_init(&ctrl->laddr_ida);
	273	idr_init(&ctrl->tid_idr);
	274	mutex_init(&ctrl->lock);
4b14e62a SD	275	mutex_init(&ctrl->sched.m_reconf);
4b14e62a SD	276	init_completion(&ctrl->sched.pause_comp);
8147760d	277	spin_lock_init(&ctrl->txn_lock);
46a2bb5a SD	278
	279	dev_dbg(ctrl->dev, "Bus [%s] registered:dev:%p\n",
	280	ctrl->name, ctrl->dev);
	281
7588a511 SK	282	of_register_slim_devices(ctrl);
7588a511 SK	283
46a2bb5a SD	284	return 0;
	285	}
	286	EXPORT_SYMBOL_GPL(slim_register_controller);
	287
	288	/* slim_remove_device: Remove the effect of slim_add_device() */
	289	static void slim_remove_device(struct slim_device *sbdev)
	290	{
	291	device_unregister(&sbdev->dev);
	292	}
	293
	294	static int slim_ctrl_remove_device(struct device dev, void null)
	295	{
	296	slim_remove_device(to_slim_device(dev));
	297	return 0;
	298	}
	299
	300	/**
	301	* slim_unregister_controller() - Controller tear-down.
	302	*
	303	* @ctrl: Controller to tear-down.
	304	*/
	305	int slim_unregister_controller(struct slim_controller *ctrl)
	306	{
	307	/* Remove all clients */
	308	device_for_each_child(ctrl->dev, NULL, slim_ctrl_remove_device);
4b14e62a SD	309	/* Enter Clock Pause */
4b14e62a SD	310	slim_ctrl_clk_pause(ctrl, false, 0);
46a2bb5a SD	311	ida_simple_remove(&ctrl_ida, ctrl->id);
	312
	313	return 0;
	314	}
	315	EXPORT_SYMBOL_GPL(slim_unregister_controller);
	316
46a2bb5a SD	317	/**
	318	* slim_report_absent() - Controller calls this function when a device
	319	* reports absent, OR when the device cannot be communicated with
	320	*
	321	* @sbdev: Device that cannot be reached, or sent report absent
	322	*/
	323	void slim_report_absent(struct slim_device *sbdev)
	324	{
	325	struct slim_controller *ctrl = sbdev->ctrl;
	326
	327	if (!ctrl)
	328	return;
	329
	330	/* invalidate logical addresses */
	331	mutex_lock(&ctrl->lock);
	332	sbdev->is_laddr_valid = false;
	333	mutex_unlock(&ctrl->lock);
	334
	335	ida_simple_remove(&ctrl->laddr_ida, sbdev->laddr);
	336	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_DOWN);
	337	}
	338	EXPORT_SYMBOL_GPL(slim_report_absent);
	339
	340	static bool slim_eaddr_equal(struct slim_eaddr a, struct slim_eaddr b)
	341	{
	342	return (a->manf_id == b->manf_id &&
	343	a->prod_code == b->prod_code &&
	344	a->dev_index == b->dev_index &&
	345	a->instance == b->instance);
	346	}
	347
	348	static int slim_match_dev(struct device dev, void data)
	349	{
	350	struct slim_eaddr *e_addr = data;
	351	struct slim_device *sbdev = to_slim_device(dev);
	352
	353	return slim_eaddr_equal(&sbdev->e_addr, e_addr);
	354	}
	355
	356	static struct slim_device find_slim_device(struct slim_controller ctrl,
	357	struct slim_eaddr *eaddr)
	358	{
	359	struct slim_device *sbdev;
	360	struct device *dev;
	361
	362	dev = device_find_child(ctrl->dev, eaddr, slim_match_dev);
	363	if (dev) {
	364	sbdev = to_slim_device(dev);
	365	return sbdev;
	366	}
	367
	368	return NULL;
	369	}
	370
	371	/**
	372	* slim_get_device() - get handle to a device.
	373	*
	374	* @ctrl: Controller on which this device will be added/queried
	375	* @e_addr: Enumeration address of the device to be queried
	376	*
	377	* Return: pointer to a device if it has already reported. Creates a new
	378	* device and returns pointer to it if the device has not yet enumerated.
	379	*/
	380	struct slim_device slim_get_device(struct slim_controller ctrl,
381	struct slim_eaddr *e_addr)
382	{
383	struct slim_device *sbdev;
384
385	sbdev = find_slim_device(ctrl, e_addr);
386	if (!sbdev) {
387	sbdev = slim_alloc_device(ctrl, e_addr, NULL);
388	if (!sbdev)
389	return ERR_PTR(-ENOMEM);
390	}
391
392	return sbdev;
393	}
394	EXPORT_SYMBOL_GPL(slim_get_device);
395
e0772de8 SK	396	static int of_slim_match_dev(struct device dev, void data)
	397	{
	398	struct device_node *np = data;
	399	struct slim_device *sbdev = to_slim_device(dev);
	400
	401	return (sbdev->dev.of_node == np);
	402	}
	403
	404	static struct slim_device of_find_slim_device(struct slim_controller ctrl,
	405	struct device_node *np)
	406	{
	407	struct slim_device *sbdev;
	408	struct device *dev;
	409
	410	dev = device_find_child(ctrl->dev, np, of_slim_match_dev);
	411	if (dev) {
	412	sbdev = to_slim_device(dev);
	413	return sbdev;
	414	}
	415
	416	return NULL;
	417	}
	418
	419	/**
	420	* of_slim_get_device() - get handle to a device using dt node.
	421	*
	422	* @ctrl: Controller on which this device will be added/queried
	423	* @np: node pointer to device
	424	*
	425	* Return: pointer to a device if it has already reported. Creates a new
	426	* device and returns pointer to it if the device has not yet enumerated.
	427	*/
	428	struct slim_device of_slim_get_device(struct slim_controller ctrl,
	429	struct device_node *np)
	430	{
	431	return of_find_slim_device(ctrl, np);
	432	}
	433	EXPORT_SYMBOL_GPL(of_slim_get_device);
	434
46a2bb5a SD	435	static int slim_device_alloc_laddr(struct slim_device *sbdev,
	436	bool report_present)
	437	{
	438	struct slim_controller *ctrl = sbdev->ctrl;
	439	u8 laddr;
	440	int ret;
	441
	442	mutex_lock(&ctrl->lock);
	443	if (ctrl->get_laddr) {
	444	ret = ctrl->get_laddr(ctrl, &sbdev->e_addr, &laddr);
	445	if (ret < 0)
	446	goto err;
	447	} else if (report_present) {
	448	ret = ida_simple_get(&ctrl->laddr_ida,
	449	0, SLIM_LA_MANAGER - 1, GFP_KERNEL);
	450	if (ret < 0)
	451	goto err;
	452
	453	laddr = ret;
	454	} else {
	455	ret = -EINVAL;
	456	goto err;
	457	}
	458
	459	if (ctrl->set_laddr) {
	460	ret = ctrl->set_laddr(ctrl, &sbdev->e_addr, laddr);
	461	if (ret) {
	462	ret = -EINVAL;
	463	goto err;
	464	}
	465	}
	466
	467	sbdev->laddr = laddr;
	468	sbdev->is_laddr_valid = true;
cfb32101	469	mutex_unlock(&ctrl->lock);
46a2bb5a SD	470
	471	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP);
	472
	473	dev_dbg(ctrl->dev, "setting slimbus l-addr:%x, ea:%x,%x,%x,%x\n",
	474	laddr, sbdev->e_addr.manf_id, sbdev->e_addr.prod_code,
	475	sbdev->e_addr.dev_index, sbdev->e_addr.instance);
	476
cfb32101 SK	477	return 0;
cfb32101 SK	478
46a2bb5a SD	479	err:
	480	mutex_unlock(&ctrl->lock);
	481	return ret;
	482
	483	}
	484
	485	/**
	486	* slim_device_report_present() - Report enumerated device.
	487	*
	488	* @ctrl: Controller with which device is enumerated.
	489	* @e_addr: Enumeration address of the device.
	490	* @laddr: Return logical address (if valid flag is false)
	491	*
	492	* Called by controller in response to REPORT_PRESENT. Framework will assign
	493	* a logical address to this enumeration address.
	494	* Function returns -EXFULL to indicate that all logical addresses are already
	495	* taken.
	496	*/
	497	int slim_device_report_present(struct slim_controller *ctrl,
	498	struct slim_eaddr e_addr, u8 laddr)
	499	{
	500	struct slim_device *sbdev;
	501	int ret;
	502
4b14e62a SD	503	ret = pm_runtime_get_sync(ctrl->dev);
	504
	505	if (ctrl->sched.clk_state != SLIM_CLK_ACTIVE) {
	506	dev_err(ctrl->dev, "slim ctrl not active,state:%d, ret:%d\n",
	507	ctrl->sched.clk_state, ret);
	508	goto slimbus_not_active;
	509	}
	510
46a2bb5a SD	511	sbdev = slim_get_device(ctrl, e_addr);
	512	if (IS_ERR(sbdev))
	513	return -ENODEV;
	514
	515	if (sbdev->is_laddr_valid) {
	516	*laddr = sbdev->laddr;
	517	return 0;
	518	}
	519
	520	ret = slim_device_alloc_laddr(sbdev, true);
	521
4b14e62a SD	522	slimbus_not_active:
	523	pm_runtime_mark_last_busy(ctrl->dev);
	524	pm_runtime_put_autosuspend(ctrl->dev);
46a2bb5a SD	525	return ret;
	526	}
	527	EXPORT_SYMBOL_GPL(slim_device_report_present);
	528
	529	/**
	530	* slim_get_logical_addr() - get/allocate logical address of a SLIMbus device.
	531	*
	532	* @sbdev: client handle requesting the address.
	533	*
	534	* Return: zero if a logical address is valid or a new logical address
	535	* has been assigned. error code in case of error.
	536	*/
	537	int slim_get_logical_addr(struct slim_device *sbdev)
	538	{
	539	if (!sbdev->is_laddr_valid)
	540	return slim_device_alloc_laddr(sbdev, false);
	541
	542	return 0;
	543	}
	544	EXPORT_SYMBOL_GPL(slim_get_logical_addr);
	545
3648e78e SD	546	static void __exit slimbus_exit(void)
	547	{
	548	bus_unregister(&slimbus_bus);
	549	}
	550	module_exit(slimbus_exit);
	551
	552	static int __init slimbus_init(void)
	553	{
	554	return bus_register(&slimbus_bus);
	555	}
	556	postcore_initcall(slimbus_init);
	557
	558	MODULE_LICENSE("GPL v2");
	559	MODULE_DESCRIPTION("SLIMbus core");