[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);

	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);
	sbdev->dev.of_node = of_node_get(node);
	sbdev->dev.fwnode = of_fwnode_handle(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)
{
	of_node_put(sbdev->dev.of_node);
	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);
	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);
	if (!ctrl->get_laddr)
		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);
9e663f48 SK	101
	102	return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev));
	103	}
	104
3648e78e SD	105	struct bus_type slimbus_bus = {
	106	.name = "slimbus",
	107	.match = slim_device_match,
	108	.probe = slim_device_probe,
	109	.remove = slim_device_remove,
9e663f48	110	.uevent = slim_device_uevent,
3648e78e SD	111	};
	112	EXPORT_SYMBOL_GPL(slimbus_bus);
	113
	114	/*
	115	* __slim_driver_register() - Client driver registration with SLIMbus
	116	*
	117	* @drv:Client driver to be associated with client-device.
	118	* @owner: owning module/driver
	119	*
	120	* This API will register the client driver with the SLIMbus
	121	* It is called from the driver's module-init function.
	122	*/
	123	int __slim_driver_register(struct slim_driver drv, struct module owner)
	124	{
	125	/* ID table and probe are mandatory */
14a649d3	126	if (!(drv->driver.of_match_table \|\| drv->id_table) \|\| !drv->probe)
3648e78e SD	127	return -EINVAL;
	128
	129	drv->driver.bus = &slimbus_bus;
	130	drv->driver.owner = owner;
	131
	132	return driver_register(&drv->driver);
	133	}
	134	EXPORT_SYMBOL_GPL(__slim_driver_register);
	135
	136	/*
	137	* slim_driver_unregister() - Undo effect of slim_driver_register
	138	*
	139	* @drv: Client driver to be unregistered
	140	*/
	141	void slim_driver_unregister(struct slim_driver *drv)
	142	{
	143	driver_unregister(&drv->driver);
	144	}
	145	EXPORT_SYMBOL_GPL(slim_driver_unregister);
	146
46a2bb5a SD	147	static void slim_dev_release(struct device *dev)
	148	{
	149	struct slim_device *sbdev = to_slim_device(dev);
	150
	151	kfree(sbdev);
	152	}
	153
	154	static int slim_add_device(struct slim_controller *ctrl,
	155	struct slim_device *sbdev,
	156	struct device_node *node)
	157	{
	158	sbdev->dev.bus = &slimbus_bus;
	159	sbdev->dev.parent = ctrl->dev;
	160	sbdev->dev.release = slim_dev_release;
	161	sbdev->dev.driver = NULL;
	162	sbdev->ctrl = ctrl;
abb9c9b8 SK	163	INIT_LIST_HEAD(&sbdev->stream_list);
abb9c9b8 SK	164	spin_lock_init(&sbdev->stream_list_lock);
dbf4d133 SK	165	sbdev->dev.of_node = of_node_get(node);
dbf4d133 SK	166	sbdev->dev.fwnode = of_fwnode_handle(node);
7588a511	167
46a2bb5a SD	168	dev_set_name(&sbdev->dev, "%x:%x:%x:%x",
	169	sbdev->e_addr.manf_id,
	170	sbdev->e_addr.prod_code,
	171	sbdev->e_addr.dev_index,
	172	sbdev->e_addr.instance);
	173
	174	return device_register(&sbdev->dev);
	175	}
	176
	177	static struct slim_device slim_alloc_device(struct slim_controller ctrl,
	178	struct slim_eaddr *eaddr,
	179	struct device_node *node)
	180	{
	181	struct slim_device *sbdev;
	182	int ret;
	183
	184	sbdev = kzalloc(sizeof(*sbdev), GFP_KERNEL);
	185	if (!sbdev)
	186	return NULL;
	187
	188	sbdev->e_addr = *eaddr;
	189	ret = slim_add_device(ctrl, sbdev, node);
	190	if (ret) {
bd329f02	191	put_device(&sbdev->dev);
46a2bb5a SD	192	return NULL;
	193	}
	194
	195	return sbdev;
	196	}
	197
7588a511 SK	198	static void of_register_slim_devices(struct slim_controller *ctrl)
	199	{
	200	struct device *dev = ctrl->dev;
	201	struct device_node *node;
	202
	203	if (!ctrl->dev->of_node)
	204	return;
	205
	206	for_each_child_of_node(ctrl->dev->of_node, node) {
	207	struct slim_device *sbdev;
	208	struct slim_eaddr e_addr;
	209	const char *compat = NULL;
	210	int reg[2], ret;
	211	int manf_id, prod_code;
	212
	213	compat = of_get_property(node, "compatible", NULL);
	214	if (!compat)
	215	continue;
	216
	217	ret = sscanf(compat, "slim%x,%x", &manf_id, &prod_code);
	218	if (ret != 2) {
	219	dev_err(dev, "Manf ID & Product code not found %s\n",
	220	compat);
	221	continue;
	222	}
	223
	224	ret = of_property_read_u32_array(node, "reg", reg, 2);
	225	if (ret) {
	226	dev_err(dev, "Device and Instance id not found:%d\n",
	227	ret);
	228	continue;
	229	}
	230
	231	e_addr.dev_index = reg[0];
	232	e_addr.instance = reg[1];
	233	e_addr.manf_id = manf_id;
	234	e_addr.prod_code = prod_code;
	235
	236	sbdev = slim_alloc_device(ctrl, &e_addr, node);
	237	if (!sbdev)
	238	continue;
	239	}
	240	}
	241
46a2bb5a SD	242	/*
	243	* slim_register_controller() - Controller bring-up and registration.
	244	*
	245	* @ctrl: Controller to be registered.
	246	*
	247	* A controller is registered with the framework using this API.
	248	* If devices on a controller were registered before controller,
	249	* this will make sure that they get probed when controller is up
	250	*/
	251	int slim_register_controller(struct slim_controller *ctrl)
	252	{
	253	int id;
	254
	255	id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
	256	if (id < 0)
	257	return id;
	258
	259	ctrl->id = id;
	260
	261	if (!ctrl->min_cg)
	262	ctrl->min_cg = SLIM_MIN_CLK_GEAR;
	263	if (!ctrl->max_cg)
	264	ctrl->max_cg = SLIM_MAX_CLK_GEAR;
	265
	266	ida_init(&ctrl->laddr_ida);
	267	idr_init(&ctrl->tid_idr);
	268	mutex_init(&ctrl->lock);
4b14e62a SD	269	mutex_init(&ctrl->sched.m_reconf);
4b14e62a SD	270	init_completion(&ctrl->sched.pause_comp);
8147760d	271	spin_lock_init(&ctrl->txn_lock);
46a2bb5a SD	272
	273	dev_dbg(ctrl->dev, "Bus [%s] registered:dev:%p\n",
	274	ctrl->name, ctrl->dev);
	275
7588a511 SK	276	of_register_slim_devices(ctrl);
7588a511 SK	277
46a2bb5a SD	278	return 0;
	279	}
	280	EXPORT_SYMBOL_GPL(slim_register_controller);
	281
	282	/* slim_remove_device: Remove the effect of slim_add_device() */
	283	static void slim_remove_device(struct slim_device *sbdev)
	284	{
01360857	285	of_node_put(sbdev->dev.of_node);
46a2bb5a SD	286	device_unregister(&sbdev->dev);
	287	}
	288
	289	static int slim_ctrl_remove_device(struct device dev, void null)
	290	{
	291	slim_remove_device(to_slim_device(dev));
	292	return 0;
	293	}
	294
	295	/**
	296	* slim_unregister_controller() - Controller tear-down.
	297	*
	298	* @ctrl: Controller to tear-down.
	299	*/
	300	int slim_unregister_controller(struct slim_controller *ctrl)
	301	{
	302	/* Remove all clients */
	303	device_for_each_child(ctrl->dev, NULL, slim_ctrl_remove_device);
	304	ida_simple_remove(&ctrl_ida, ctrl->id);
	305
	306	return 0;
	307	}
	308	EXPORT_SYMBOL_GPL(slim_unregister_controller);
	309
46a2bb5a SD	310	/**
	311	* slim_report_absent() - Controller calls this function when a device
	312	* reports absent, OR when the device cannot be communicated with
	313	*
	314	* @sbdev: Device that cannot be reached, or sent report absent
	315	*/
	316	void slim_report_absent(struct slim_device *sbdev)
	317	{
	318	struct slim_controller *ctrl = sbdev->ctrl;
	319
	320	if (!ctrl)
	321	return;
	322
	323	/* invalidate logical addresses */
	324	mutex_lock(&ctrl->lock);
	325	sbdev->is_laddr_valid = false;
	326	mutex_unlock(&ctrl->lock);
f97769fd SK	327	if (!ctrl->get_laddr)
f97769fd SK	328	ida_simple_remove(&ctrl->laddr_ida, sbdev->laddr);
46a2bb5a SD	329	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_DOWN);
	330	}
	331	EXPORT_SYMBOL_GPL(slim_report_absent);
	332
	333	static bool slim_eaddr_equal(struct slim_eaddr a, struct slim_eaddr b)
	334	{
	335	return (a->manf_id == b->manf_id &&
	336	a->prod_code == b->prod_code &&
	337	a->dev_index == b->dev_index &&
	338	a->instance == b->instance);
	339	}
	340
	341	static int slim_match_dev(struct device dev, void data)
	342	{
	343	struct slim_eaddr *e_addr = data;
	344	struct slim_device *sbdev = to_slim_device(dev);
	345
	346	return slim_eaddr_equal(&sbdev->e_addr, e_addr);
	347	}
	348
	349	static struct slim_device find_slim_device(struct slim_controller ctrl,
	350	struct slim_eaddr *eaddr)
	351	{
	352	struct slim_device *sbdev;
	353	struct device *dev;
	354
	355	dev = device_find_child(ctrl->dev, eaddr, slim_match_dev);
	356	if (dev) {
	357	sbdev = to_slim_device(dev);
	358	return sbdev;
	359	}
	360
	361	return NULL;
	362	}
	363
	364	/**
	365	* slim_get_device() - get handle to a device.
	366	*
	367	* @ctrl: Controller on which this device will be added/queried
	368	* @e_addr: Enumeration address of the device to be queried
	369	*
	370	* Return: pointer to a device if it has already reported. Creates a new
	371	* device and returns pointer to it if the device has not yet enumerated.
	372	*/
	373	struct slim_device slim_get_device(struct slim_controller ctrl,
	374	struct slim_eaddr *e_addr)
	375	{
	376	struct slim_device *sbdev;
	377
	378	sbdev = find_slim_device(ctrl, e_addr);
	379	if (!sbdev) {
	380	sbdev = slim_alloc_device(ctrl, e_addr, NULL);
	381	if (!sbdev)
	382	return ERR_PTR(-ENOMEM);
	383	}
	384
	385	return sbdev;
	386	}
	387	EXPORT_SYMBOL_GPL(slim_get_device);
	388
e0772de8 SK	389	static int of_slim_match_dev(struct device dev, void data)
	390	{
	391	struct device_node *np = data;
	392	struct slim_device *sbdev = to_slim_device(dev);
	393
	394	return (sbdev->dev.of_node == np);
	395	}
	396
	397	static struct slim_device of_find_slim_device(struct slim_controller ctrl,
	398	struct device_node *np)
	399	{
	400	struct slim_device *sbdev;
	401	struct device *dev;
	402
	403	dev = device_find_child(ctrl->dev, np, of_slim_match_dev);
	404	if (dev) {
	405	sbdev = to_slim_device(dev);
	406	return sbdev;
	407	}
	408
	409	return NULL;
	410	}
	411
	412	/**
	413	* of_slim_get_device() - get handle to a device using dt node.
	414	*
	415	* @ctrl: Controller on which this device will be added/queried
	416	* @np: node pointer to device
	417	*
	418	* Return: pointer to a device if it has already reported. Creates a new
	419	* device and returns pointer to it if the device has not yet enumerated.
	420	*/
	421	struct slim_device of_slim_get_device(struct slim_controller ctrl,
	422	struct device_node *np)
	423	{
	424	return of_find_slim_device(ctrl, np);
	425	}
	426	EXPORT_SYMBOL_GPL(of_slim_get_device);
	427
46a2bb5a SD	428	static int slim_device_alloc_laddr(struct slim_device *sbdev,
	429	bool report_present)
	430	{
	431	struct slim_controller *ctrl = sbdev->ctrl;
	432	u8 laddr;
	433	int ret;
	434
	435	mutex_lock(&ctrl->lock);
	436	if (ctrl->get_laddr) {
	437	ret = ctrl->get_laddr(ctrl, &sbdev->e_addr, &laddr);
	438	if (ret < 0)
	439	goto err;
	440	} else if (report_present) {
	441	ret = ida_simple_get(&ctrl->laddr_ida,
	442	0, SLIM_LA_MANAGER - 1, GFP_KERNEL);
	443	if (ret < 0)
	444	goto err;
	445
	446	laddr = ret;
	447	} else {
	448	ret = -EINVAL;
	449	goto err;
	450	}
	451
	452	if (ctrl->set_laddr) {
	453	ret = ctrl->set_laddr(ctrl, &sbdev->e_addr, laddr);
	454	if (ret) {
	455	ret = -EINVAL;
	456	goto err;
	457	}
	458	}
	459
	460	sbdev->laddr = laddr;
	461	sbdev->is_laddr_valid = true;
cfb32101	462	mutex_unlock(&ctrl->lock);
46a2bb5a SD	463
	464	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP);
	465
	466	dev_dbg(ctrl->dev, "setting slimbus l-addr:%x, ea:%x,%x,%x,%x\n",
	467	laddr, sbdev->e_addr.manf_id, sbdev->e_addr.prod_code,
	468	sbdev->e_addr.dev_index, sbdev->e_addr.instance);
	469
cfb32101 SK	470	return 0;
cfb32101 SK	471
46a2bb5a SD	472	err:
	473	mutex_unlock(&ctrl->lock);
	474	return ret;
	475
	476	}
	477
	478	/**
	479	* slim_device_report_present() - Report enumerated device.
	480	*
	481	* @ctrl: Controller with which device is enumerated.
	482	* @e_addr: Enumeration address of the device.
	483	* @laddr: Return logical address (if valid flag is false)
	484	*
	485	* Called by controller in response to REPORT_PRESENT. Framework will assign
	486	* a logical address to this enumeration address.
	487	* Function returns -EXFULL to indicate that all logical addresses are already
	488	* taken.
	489	*/
	490	int slim_device_report_present(struct slim_controller *ctrl,
	491	struct slim_eaddr e_addr, u8 laddr)
	492	{
	493	struct slim_device *sbdev;
	494	int ret;
	495
4b14e62a SD	496	ret = pm_runtime_get_sync(ctrl->dev);
	497
	498	if (ctrl->sched.clk_state != SLIM_CLK_ACTIVE) {
	499	dev_err(ctrl->dev, "slim ctrl not active,state:%d, ret:%d\n",
	500	ctrl->sched.clk_state, ret);
	501	goto slimbus_not_active;
	502	}
	503
46a2bb5a SD	504	sbdev = slim_get_device(ctrl, e_addr);
	505	if (IS_ERR(sbdev))
	506	return -ENODEV;
	507
	508	if (sbdev->is_laddr_valid) {
	509	*laddr = sbdev->laddr;
	510	return 0;
	511	}
	512
	513	ret = slim_device_alloc_laddr(sbdev, true);
	514
4b14e62a SD	515	slimbus_not_active:
	516	pm_runtime_mark_last_busy(ctrl->dev);
	517	pm_runtime_put_autosuspend(ctrl->dev);
46a2bb5a SD	518	return ret;
	519	}
	520	EXPORT_SYMBOL_GPL(slim_device_report_present);
	521
	522	/**
	523	* slim_get_logical_addr() - get/allocate logical address of a SLIMbus device.
	524	*
	525	* @sbdev: client handle requesting the address.
	526	*
	527	* Return: zero if a logical address is valid or a new logical address
	528	* has been assigned. error code in case of error.
	529	*/
	530	int slim_get_logical_addr(struct slim_device *sbdev)
	531	{
	532	if (!sbdev->is_laddr_valid)
	533	return slim_device_alloc_laddr(sbdev, false);
	534
	535	return 0;
	536	}
	537	EXPORT_SYMBOL_GPL(slim_get_logical_addr);
	538
3648e78e SD	539	static void __exit slimbus_exit(void)
	540	{
	541	bus_unregister(&slimbus_bus);
	542	}
	543	module_exit(slimbus_exit);
	544
	545	static int __init slimbus_init(void)
	546	{
	547	return bus_register(&slimbus_bus);
	548	}
	549	postcore_initcall(slimbus_init);
	550
	551	MODULE_LICENSE("GPL v2");
	552	MODULE_DESCRIPTION("SLIMbus core");