1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Microchip switch driver main logic
  4 *
  5 * Copyright (C) 2017-2019 Microchip Technology Inc.
  6 */
  7
  8#include <linux/delay.h>
  9#include <linux/export.h>
 10#include <linux/gpio/consumer.h>
 11#include <linux/kernel.h>
 12#include <linux/module.h>
 13#include <linux/platform_data/microchip-ksz.h>
 14#include <linux/phy.h>
 15#include <linux/etherdevice.h>
 16#include <linux/if_bridge.h>
 17#include <linux/of_net.h>
 18#include <net/dsa.h>
 19#include <net/switchdev.h>
 20
 21#include "ksz_common.h"
 22
 23void ksz_update_port_member(struct ksz_device *dev, int port)
 24{
 25	struct ksz_port *p;
 26	int i;
 27
 28	for (i = 0; i < dev->port_cnt; i++) {
 29		if (i == port || i == dev->cpu_port)
 30			continue;
 31		p = &dev->ports[i];
 32		if (!(dev->member & (1 << i)))
 33			continue;
 34
 35		/* Port is a member of the bridge and is forwarding. */
 36		if (p->stp_state == BR_STATE_FORWARDING &&
 37		    p->member != dev->member)
 38			dev->dev_ops->cfg_port_member(dev, i, dev->member);
 39	}
 40}
 41EXPORT_SYMBOL_GPL(ksz_update_port_member);
 42
 43static void port_r_cnt(struct ksz_device *dev, int port)
 44{
 45	struct ksz_port_mib *mib = &dev->ports[port].mib;
 46	u64 *dropped;
 47
 48	/* Some ports may not have MIB counters before SWITCH_COUNTER_NUM. */
 49	while (mib->cnt_ptr < dev->reg_mib_cnt) {
 50		dev->dev_ops->r_mib_cnt(dev, port, mib->cnt_ptr,
 51					&mib->counters[mib->cnt_ptr]);
 52		++mib->cnt_ptr;
 53	}
 54
 55	/* last one in storage */
 56	dropped = &mib->counters[dev->mib_cnt];
 57
 58	/* Some ports may not have MIB counters after SWITCH_COUNTER_NUM. */
 59	while (mib->cnt_ptr < dev->mib_cnt) {
 60		dev->dev_ops->r_mib_pkt(dev, port, mib->cnt_ptr,
 61					dropped, &mib->counters[mib->cnt_ptr]);
 62		++mib->cnt_ptr;
 63	}
 64	mib->cnt_ptr = 0;
 65}
 66
 67static void ksz_mib_read_work(struct work_struct *work)
 68{
 69	struct ksz_device *dev = container_of(work, struct ksz_device,
 70					      mib_read.work);
 71	struct ksz_port_mib *mib;
 72	struct ksz_port *p;
 73	int i;
 74
 75	for (i = 0; i < dev->port_cnt; i++) {
 76		if (dsa_is_unused_port(dev->ds, i))
 77			continue;
 78
 79		p = &dev->ports[i];
 80		mib = &p->mib;
 81		mutex_lock(&mib->cnt_mutex);
 82
 83		/* Only read MIB counters when the port is told to do.
 84		 * If not, read only dropped counters when link is not up.
 85		 */
 86		if (!p->read) {
 87			const struct dsa_port *dp = dsa_to_port(dev->ds, i);
 88
 89			if (!netif_carrier_ok(dp->slave))
 90				mib->cnt_ptr = dev->reg_mib_cnt;
 91		}
 92		port_r_cnt(dev, i);
 93		p->read = false;
 94		mutex_unlock(&mib->cnt_mutex);
 95	}
 96
 97	schedule_delayed_work(&dev->mib_read, dev->mib_read_interval);
 98}
 99
100void ksz_init_mib_timer(struct ksz_device *dev)
101{
102	int i;
103
104	INIT_DELAYED_WORK(&dev->mib_read, ksz_mib_read_work);
105
106	for (i = 0; i < dev->port_cnt; i++)
107		dev->dev_ops->port_init_cnt(dev, i);
108}
109EXPORT_SYMBOL_GPL(ksz_init_mib_timer);
110
111int ksz_phy_read16(struct dsa_switch *ds, int addr, int reg)
112{
113	struct ksz_device *dev = ds->priv;
114	u16 val = 0xffff;
115
116	dev->dev_ops->r_phy(dev, addr, reg, &val);
117
118	return val;
119}
120EXPORT_SYMBOL_GPL(ksz_phy_read16);
121
122int ksz_phy_write16(struct dsa_switch *ds, int addr, int reg, u16 val)
123{
124	struct ksz_device *dev = ds->priv;
125
126	dev->dev_ops->w_phy(dev, addr, reg, val);
127
128	return 0;
129}
130EXPORT_SYMBOL_GPL(ksz_phy_write16);
131
132void ksz_mac_link_down(struct dsa_switch *ds, int port, unsigned int mode,
133		       phy_interface_t interface)
134{
135	struct ksz_device *dev = ds->priv;
136	struct ksz_port *p = &dev->ports[port];
137
138	/* Read all MIB counters when the link is going down. */
139	p->read = true;
140	/* timer started */
141	if (dev->mib_read_interval)
142		schedule_delayed_work(&dev->mib_read, 0);
143}
144EXPORT_SYMBOL_GPL(ksz_mac_link_down);
145
146int ksz_sset_count(struct dsa_switch *ds, int port, int sset)
147{
148	struct ksz_device *dev = ds->priv;
149
150	if (sset != ETH_SS_STATS)
151		return 0;
152
153	return dev->mib_cnt;
154}
155EXPORT_SYMBOL_GPL(ksz_sset_count);
156
157void ksz_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *buf)
158{
159	const struct dsa_port *dp = dsa_to_port(ds, port);
160	struct ksz_device *dev = ds->priv;
161	struct ksz_port_mib *mib;
162
163	mib = &dev->ports[port].mib;
164	mutex_lock(&mib->cnt_mutex);
165
166	/* Only read dropped counters if no link. */
167	if (!netif_carrier_ok(dp->slave))
168		mib->cnt_ptr = dev->reg_mib_cnt;
169	port_r_cnt(dev, port);
170	memcpy(buf, mib->counters, dev->mib_cnt * sizeof(u64));
171	mutex_unlock(&mib->cnt_mutex);
172}
173EXPORT_SYMBOL_GPL(ksz_get_ethtool_stats);
174
175int ksz_port_bridge_join(struct dsa_switch *ds, int port,
176			 struct net_device *br)
177{
178	struct ksz_device *dev = ds->priv;
179
180	mutex_lock(&dev->dev_mutex);
181	dev->br_member |= (1 << port);
182	mutex_unlock(&dev->dev_mutex);
183
184	/* port_stp_state_set() will be called after to put the port in
185	 * appropriate state so there is no need to do anything.
186	 */
187
188	return 0;
189}
190EXPORT_SYMBOL_GPL(ksz_port_bridge_join);
191
192void ksz_port_bridge_leave(struct dsa_switch *ds, int port,
193			   struct net_device *br)
194{
195	struct ksz_device *dev = ds->priv;
196
197	mutex_lock(&dev->dev_mutex);
198	dev->br_member &= ~(1 << port);
199	dev->member &= ~(1 << port);
200	mutex_unlock(&dev->dev_mutex);
201
202	/* port_stp_state_set() will be called after to put the port in
203	 * forwarding state so there is no need to do anything.
204	 */
205}
206EXPORT_SYMBOL_GPL(ksz_port_bridge_leave);
207
208void ksz_port_fast_age(struct dsa_switch *ds, int port)
209{
210	struct ksz_device *dev = ds->priv;
211
212	dev->dev_ops->flush_dyn_mac_table(dev, port);
213}
214EXPORT_SYMBOL_GPL(ksz_port_fast_age);
215
216int ksz_port_fdb_dump(struct dsa_switch *ds, int port, dsa_fdb_dump_cb_t *cb,
217		      void *data)
218{
219	struct ksz_device *dev = ds->priv;
220	int ret = 0;
221	u16 i = 0;
222	u16 entries = 0;
223	u8 timestamp = 0;
224	u8 fid;
225	u8 member;
226	struct alu_struct alu;
227
228	do {
229		alu.is_static = false;
230		ret = dev->dev_ops->r_dyn_mac_table(dev, i, alu.mac, &fid,
231						    &member, &timestamp,
232						    &entries);
233		if (!ret && (member & BIT(port))) {
234			ret = cb(alu.mac, alu.fid, alu.is_static, data);
235			if (ret)
236				break;
237		}
238		i++;
239	} while (i < entries);
240	if (i >= entries)
241		ret = 0;
242
243	return ret;
244}
245EXPORT_SYMBOL_GPL(ksz_port_fdb_dump);
246
247int ksz_port_mdb_add(struct dsa_switch *ds, int port,
248		     const struct switchdev_obj_port_mdb *mdb)
249{
250	struct ksz_device *dev = ds->priv;
251	struct alu_struct alu;
252	int index;
253	int empty = 0;
254
255	alu.port_forward = 0;
256	for (index = 0; index < dev->num_statics; index++) {
257		if (!dev->dev_ops->r_sta_mac_table(dev, index, &alu)) {
258			/* Found one already in static MAC table. */
259			if (!memcmp(alu.mac, mdb->addr, ETH_ALEN) &&
260			    alu.fid == mdb->vid)
261				break;
262		/* Remember the first empty entry. */
263		} else if (!empty) {
264			empty = index + 1;
265		}
266	}
267
268	/* no available entry */
269	if (index == dev->num_statics && !empty)
270		return -ENOSPC;
271
272	/* add entry */
273	if (index == dev->num_statics) {
274		index = empty - 1;
275		memset(&alu, 0, sizeof(alu));
276		memcpy(alu.mac, mdb->addr, ETH_ALEN);
277		alu.is_static = true;
278	}
279	alu.port_forward |= BIT(port);
280	if (mdb->vid) {
281		alu.is_use_fid = true;
282
283		/* Need a way to map VID to FID. */
284		alu.fid = mdb->vid;
285	}
286	dev->dev_ops->w_sta_mac_table(dev, index, &alu);
287
288	return 0;
289}
290EXPORT_SYMBOL_GPL(ksz_port_mdb_add);
291
292int ksz_port_mdb_del(struct dsa_switch *ds, int port,
293		     const struct switchdev_obj_port_mdb *mdb)
294{
295	struct ksz_device *dev = ds->priv;
296	struct alu_struct alu;
297	int index;
298	int ret = 0;
299
300	for (index = 0; index < dev->num_statics; index++) {
301		if (!dev->dev_ops->r_sta_mac_table(dev, index, &alu)) {
302			/* Found one already in static MAC table. */
303			if (!memcmp(alu.mac, mdb->addr, ETH_ALEN) &&
304			    alu.fid == mdb->vid)
305				break;
306		}
307	}
308
309	/* no available entry */
310	if (index == dev->num_statics)
311		goto exit;
312
313	/* clear port */
314	alu.port_forward &= ~BIT(port);
315	if (!alu.port_forward)
316		alu.is_static = false;
317	dev->dev_ops->w_sta_mac_table(dev, index, &alu);
318
319exit:
320	return ret;
321}
322EXPORT_SYMBOL_GPL(ksz_port_mdb_del);
323
324int ksz_enable_port(struct dsa_switch *ds, int port, struct phy_device *phy)
325{
326	struct ksz_device *dev = ds->priv;
327
328	if (!dsa_is_user_port(ds, port))
329		return 0;
330
331	/* setup slave port */
332	dev->dev_ops->port_setup(dev, port, false);
333
334	/* port_stp_state_set() will be called after to enable the port so
335	 * there is no need to do anything.
336	 */
337
338	return 0;
339}
340EXPORT_SYMBOL_GPL(ksz_enable_port);
341
342struct ksz_device *ksz_switch_alloc(struct device *base, void *priv)
343{
344	struct dsa_switch *ds;
345	struct ksz_device *swdev;
346
347	ds = devm_kzalloc(base, sizeof(*ds), GFP_KERNEL);
348	if (!ds)
349		return NULL;
350
351	ds->dev = base;
352	ds->num_ports = DSA_MAX_PORTS;
353
354	swdev = devm_kzalloc(base, sizeof(*swdev), GFP_KERNEL);
355	if (!swdev)
356		return NULL;
357
358	ds->priv = swdev;
359	swdev->dev = base;
360
361	swdev->ds = ds;
362	swdev->priv = priv;
363
364	return swdev;
365}
366EXPORT_SYMBOL(ksz_switch_alloc);
367
368int ksz_switch_register(struct ksz_device *dev,
369			const struct ksz_dev_ops *ops)
370{
371	struct device_node *port, *ports;
372	phy_interface_t interface;
373	unsigned int port_num;
374	int ret;
375
376	if (dev->pdata)
377		dev->chip_id = dev->pdata->chip_id;
378
379	dev->reset_gpio = devm_gpiod_get_optional(dev->dev, "reset",
380						  GPIOD_OUT_LOW);
381	if (IS_ERR(dev->reset_gpio))
382		return PTR_ERR(dev->reset_gpio);
383
384	if (dev->reset_gpio) {
385		gpiod_set_value_cansleep(dev->reset_gpio, 1);
386		usleep_range(10000, 12000);
387		gpiod_set_value_cansleep(dev->reset_gpio, 0);
388		msleep(100);
389	}
390
391	mutex_init(&dev->dev_mutex);
392	mutex_init(&dev->regmap_mutex);
393	mutex_init(&dev->alu_mutex);
394	mutex_init(&dev->vlan_mutex);
395
396	dev->dev_ops = ops;
397
398	if (dev->dev_ops->detect(dev))
399		return -EINVAL;
400
401	ret = dev->dev_ops->init(dev);
402	if (ret)
403		return ret;
404
405	/* Host port interface will be self detected, or specifically set in
406	 * device tree.
407	 */
408	for (port_num = 0; port_num < dev->port_cnt; ++port_num)
409		dev->ports[port_num].interface = PHY_INTERFACE_MODE_NA;
410	if (dev->dev->of_node) {
411		ret = of_get_phy_mode(dev->dev->of_node, &interface);
412		if (ret == 0)
413			dev->compat_interface = interface;
414		ports = of_get_child_by_name(dev->dev->of_node, "ethernet-ports");
415		if (!ports)
416			ports = of_get_child_by_name(dev->dev->of_node, "ports");
417		if (ports)
418			for_each_available_child_of_node(ports, port) {
419				if (of_property_read_u32(port, "reg",
420							 &port_num))
421					continue;
422				if (!(dev->port_mask & BIT(port_num))) {
423					of_node_put(port);
424					return -EINVAL;
425				}
426				of_get_phy_mode(port,
427						&dev->ports[port_num].interface);
428			}
429		dev->synclko_125 = of_property_read_bool(dev->dev->of_node,
430							 "microchip,synclko-125");
431	}
432
433	ret = dsa_register_switch(dev->ds);
434	if (ret) {
435		dev->dev_ops->exit(dev);
436		return ret;
437	}
438
439	/* Read MIB counters every 30 seconds to avoid overflow. */
440	dev->mib_read_interval = msecs_to_jiffies(30000);
441
442	/* Start the MIB timer. */
443	schedule_delayed_work(&dev->mib_read, 0);
444
445	return 0;
446}
447EXPORT_SYMBOL(ksz_switch_register);
448
449void ksz_switch_remove(struct ksz_device *dev)
450{
451	/* timer started */
452	if (dev->mib_read_interval) {
453		dev->mib_read_interval = 0;
454		cancel_delayed_work_sync(&dev->mib_read);
455	}
456
457	dev->dev_ops->exit(dev);
458	dsa_unregister_switch(dev->ds);
459
460	if (dev->reset_gpio)
461		gpiod_set_value_cansleep(dev->reset_gpio, 1);
462
463}
464EXPORT_SYMBOL(ksz_switch_remove);
465
466MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
467MODULE_DESCRIPTION("Microchip KSZ Series Switch DSA Driver");
468MODULE_LICENSE("GPL");