mt7530-mdio.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include <linux/gpio/consumer.h>
  4#include <linux/mdio.h>
  5#include <linux/module.h>
  6#include <linux/pcs/pcs-mtk-lynxi.h>
  7#include <linux/of_irq.h>
  8#include <linux/of_mdio.h>
  9#include <linux/of_net.h>
 10#include <linux/of_platform.h>
 11#include <linux/regmap.h>
 12#include <linux/reset.h>
 13#include <linux/regulator/consumer.h>
 14#include <net/dsa.h>
 15
 16#include "mt7530.h"
 17
 18static int
 19mt7530_regmap_write(void *context, unsigned int reg, unsigned int val)
 20{
 21	struct mt7530_priv *priv = context;
 22	struct mii_bus *bus = priv->bus;
 23	u16 page, r, lo, hi;
 24	int ret;
 25
 26	page = (reg >> 6) & 0x3ff;
 27	r  = (reg >> 2) & 0xf;
 28	lo = val & 0xffff;
 29	hi = val >> 16;
 30
 31	ret = bus->write(bus, priv->mdiodev->addr, 0x1f, page);
 32	if (ret < 0)
 33		return ret;
 34
 35	ret = bus->write(bus, priv->mdiodev->addr, r, lo);
 36	if (ret < 0)
 37		return ret;
 38
 39	ret = bus->write(bus, priv->mdiodev->addr, 0x10, hi);
 40	return ret;
 41}
 42
 43static int
 44mt7530_regmap_read(void *context, unsigned int reg, unsigned int *val)
 45{
 46	struct mt7530_priv *priv = context;
 47	struct mii_bus *bus = priv->bus;
 48	u16 page, r, lo, hi;
 49	int ret;
 50
 51	page = (reg >> 6) & 0x3ff;
 52	r = (reg >> 2) & 0xf;
 53
 54	ret = bus->write(bus, priv->mdiodev->addr, 0x1f, page);
 55	if (ret < 0)
 56		return ret;
 57
 58	lo = bus->read(bus, priv->mdiodev->addr, r);
 59	hi = bus->read(bus, priv->mdiodev->addr, 0x10);
 60
 61	*val = (hi << 16) | (lo & 0xffff);
 62
 63	return 0;
 64}
 65
 66static void
 67mt7530_mdio_regmap_lock(void *mdio_lock)
 68{
 69	mutex_lock_nested(mdio_lock, MDIO_MUTEX_NESTED);
 70}
 71
 72static void
 73mt7530_mdio_regmap_unlock(void *mdio_lock)
 74{
 75	mutex_unlock(mdio_lock);
 76}
 77
 78static const struct regmap_bus mt7530_regmap_bus = {
 79	.reg_write = mt7530_regmap_write,
 80	.reg_read = mt7530_regmap_read,
 81};
 82
 83static int
 84mt7531_create_sgmii(struct mt7530_priv *priv)
 85{
 86	struct regmap_config *mt7531_pcs_config[2] = {};
 87	struct phylink_pcs *pcs;
 88	struct regmap *regmap;
 89	int i, ret = 0;
 90
 91	for (i = priv->p5_sgmii ? 0 : 1; i < 2; i++) {
 92		mt7531_pcs_config[i] = devm_kzalloc(priv->dev,
 93						    sizeof(struct regmap_config),
 94						    GFP_KERNEL);
 95		if (!mt7531_pcs_config[i]) {
 96			ret = -ENOMEM;
 97			break;
 98		}
 99
100		mt7531_pcs_config[i]->name = i ? "port6" : "port5";
101		mt7531_pcs_config[i]->reg_bits = 16;
102		mt7531_pcs_config[i]->val_bits = 32;
103		mt7531_pcs_config[i]->reg_stride = 4;
104		mt7531_pcs_config[i]->reg_base = MT7531_SGMII_REG_BASE(5 + i);
105		mt7531_pcs_config[i]->max_register = 0x17c;
106		mt7531_pcs_config[i]->lock = mt7530_mdio_regmap_lock;
107		mt7531_pcs_config[i]->unlock = mt7530_mdio_regmap_unlock;
108		mt7531_pcs_config[i]->lock_arg = &priv->bus->mdio_lock;
109
110		regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, priv,
111					  mt7531_pcs_config[i]);
112		if (IS_ERR(regmap)) {
113			ret = PTR_ERR(regmap);
114			break;
115		}
116		pcs = mtk_pcs_lynxi_create(priv->dev, regmap,
117					   MT7531_PHYA_CTRL_SIGNAL3, 0);
118		if (!pcs) {
119			ret = -ENXIO;
120			break;
121		}
122		priv->ports[5 + i].sgmii_pcs = pcs;
123	}
124
125	if (ret && i)
126		mtk_pcs_lynxi_destroy(priv->ports[5].sgmii_pcs);
127
128	return ret;
129}
130
131static const struct of_device_id mt7530_of_match[] = {
132	{ .compatible = "mediatek,mt7621", .data = &mt753x_table[ID_MT7621], },
133	{ .compatible = "mediatek,mt7530", .data = &mt753x_table[ID_MT7530], },
134	{ .compatible = "mediatek,mt7531", .data = &mt753x_table[ID_MT7531], },
135	{ /* sentinel */ },
136};
137MODULE_DEVICE_TABLE(of, mt7530_of_match);
138
139static const struct regmap_config regmap_config = {
140	.reg_bits = 16,
141	.val_bits = 32,
142	.reg_stride = 4,
143	.max_register = MT7530_CREV,
144	.disable_locking = true,
145};
146
147static int
148mt7530_probe(struct mdio_device *mdiodev)
149{
150	struct mt7530_priv *priv;
151	struct device_node *dn;
152	int ret;
153
154	dn = mdiodev->dev.of_node;
155
156	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
157	if (!priv)
158		return -ENOMEM;
159
160	priv->bus = mdiodev->bus;
161	priv->dev = &mdiodev->dev;
162	priv->mdiodev = mdiodev;
163
164	ret = mt7530_probe_common(priv);
165	if (ret)
166		return ret;
167
168	/* Use medatek,mcm property to distinguish hardware type that would
169	 * cause a little bit differences on power-on sequence.
170	 * Not MCM that indicates switch works as the remote standalone
171	 * integrated circuit so the GPIO pin would be used to complete
172	 * the reset, otherwise memory-mapped register accessing used
173	 * through syscon provides in the case of MCM.
174	 */
175	priv->mcm = of_property_read_bool(dn, "mediatek,mcm");
176	if (priv->mcm) {
177		dev_info(&mdiodev->dev, "MT7530 adapts as multi-chip module\n");
178
179		priv->rstc = devm_reset_control_get(&mdiodev->dev, "mcm");
180		if (IS_ERR(priv->rstc)) {
181			dev_err(&mdiodev->dev, "Couldn't get our reset line\n");
182			return PTR_ERR(priv->rstc);
183		}
184	} else {
185		priv->reset = devm_gpiod_get_optional(&mdiodev->dev, "reset",
186						      GPIOD_OUT_LOW);
187		if (IS_ERR(priv->reset)) {
188			dev_err(&mdiodev->dev, "Couldn't get our reset line\n");
189			return PTR_ERR(priv->reset);
190		}
191	}
192
193	if (priv->id == ID_MT7530) {
194		priv->core_pwr = devm_regulator_get(&mdiodev->dev, "core");
195		if (IS_ERR(priv->core_pwr))
196			return PTR_ERR(priv->core_pwr);
197
198		priv->io_pwr = devm_regulator_get(&mdiodev->dev, "io");
199		if (IS_ERR(priv->io_pwr))
200			return PTR_ERR(priv->io_pwr);
201	}
202
203	priv->regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, priv,
204					&regmap_config);
205	if (IS_ERR(priv->regmap))
206		return PTR_ERR(priv->regmap);
207
208	if (priv->id == ID_MT7531)
209		priv->create_sgmii = mt7531_create_sgmii;
210
211	return dsa_register_switch(priv->ds);
212}
213
214static void
215mt7530_remove(struct mdio_device *mdiodev)
216{
217	struct mt7530_priv *priv = dev_get_drvdata(&mdiodev->dev);
218	int ret = 0, i;
219
220	if (!priv)
221		return;
222
223	ret = regulator_disable(priv->core_pwr);
224	if (ret < 0)
225		dev_err(priv->dev,
226			"Failed to disable core power: %d\n", ret);
227
228	ret = regulator_disable(priv->io_pwr);
229	if (ret < 0)
230		dev_err(priv->dev, "Failed to disable io pwr: %d\n",
231			ret);
232
233	mt7530_remove_common(priv);
234
235	for (i = 0; i < 2; ++i)
236		mtk_pcs_lynxi_destroy(priv->ports[5 + i].sgmii_pcs);
237}
238
239static void mt7530_shutdown(struct mdio_device *mdiodev)
240{
241	struct mt7530_priv *priv = dev_get_drvdata(&mdiodev->dev);
242
243	if (!priv)
244		return;
245
246	dsa_switch_shutdown(priv->ds);
247
248	dev_set_drvdata(&mdiodev->dev, NULL);
249}
250
251static struct mdio_driver mt7530_mdio_driver = {
252	.probe  = mt7530_probe,
253	.remove = mt7530_remove,
254	.shutdown = mt7530_shutdown,
255	.mdiodrv.driver = {
256		.name = "mt7530-mdio",
257		.of_match_table = mt7530_of_match,
258	},
259};
260
261mdio_module_driver(mt7530_mdio_driver);
262
263MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
264MODULE_DESCRIPTION("Driver for Mediatek MT7530 Switch (MDIO)");
265MODULE_LICENSE("GPL");