[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/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);

	return sbdrv->probe(sbdev);
}

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;
}

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