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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
....@@ -1,32 +1,23 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*******************************************************************************
23   STMMAC Ethernet Driver -- MDIO bus implementation
34   Provides Bus interface for MII registers
45 
56   Copyright (C) 2007-2009  STMicroelectronics Ltd
67 
7
-  This program is free software; you can redistribute it and/or modify it
8
-  under the terms and conditions of the GNU General Public License,
9
-  version 2, as published by the Free Software Foundation.
10
-
11
-  This program is distributed in the hope it will be useful, but WITHOUT
12
-  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14
-  more details.
15
-
16
-  The full GNU General Public License is included in this distribution in
17
-  the file called "COPYING".
188 
199   Author: Carl Shaw <carl.shaw@st.com>
2010   Maintainer: Giuseppe Cavallaro <peppe.cavallaro@st.com>
2111 *******************************************************************************/
2212 
13
+#include <linux/gpio/consumer.h>
2314 #include <linux/io.h>
2415 #include <linux/iopoll.h>
2516 #include <linux/mii.h>
26
-#include <linux/of.h>
27
-#include <linux/of_gpio.h>
2817 #include <linux/of_mdio.h>
18
+#include <linux/pm_runtime.h>
2919 #include <linux/phy.h>
20
+#include <linux/property.h>
3021 #include <linux/slab.h>
3122 
3223 #include "dwxgmac2.h"
....@@ -34,11 +25,14 @@
3425 
3526 #define MII_BUSY 0x00000001
3627 #define MII_WRITE 0x00000002
28
+#define MII_DATA_MASK GENMASK(15, 0)
3729 
3830 /* GMAC4 defines */
3931 #define MII_GMAC4_GOC_SHIFT		2
32
+#define MII_GMAC4_REG_ADDR_SHIFT	16
4033 #define MII_GMAC4_WRITE			(1 << MII_GMAC4_GOC_SHIFT)
4134 #define MII_GMAC4_READ			(3 << MII_GMAC4_GOC_SHIFT)
35
+#define MII_GMAC4_C45E			BIT(1)
4236 
4337 /* XGMAC defines */
4438 #define MII_XGMAC_SADDR			BIT(18)
....@@ -48,20 +42,32 @@
4842 #define MII_XGMAC_BUSY			BIT(22)
4943 #define MII_XGMAC_MAX_C22ADDR		3
5044 #define MII_XGMAC_C22P_MASK		GENMASK(MII_XGMAC_MAX_C22ADDR, 0)
45
+#define MII_XGMAC_PA_SHIFT		16
46
+#define MII_XGMAC_DA_SHIFT		21
47
+
48
+static int stmmac_xgmac2_c45_format(struct stmmac_priv *priv, int phyaddr,
49
+				    int phyreg, u32 *hw_addr)
50
+{
51
+	u32 tmp;
52
+
53
+	/* Set port as Clause 45 */
54
+	tmp = readl(priv->ioaddr + XGMAC_MDIO_C22P);
55
+	tmp &= ~BIT(phyaddr);
56
+	writel(tmp, priv->ioaddr + XGMAC_MDIO_C22P);
57
+
58
+	*hw_addr = (phyaddr << MII_XGMAC_PA_SHIFT) | (phyreg & 0xffff);
59
+	*hw_addr |= (phyreg >> MII_DEVADDR_C45_SHIFT) << MII_XGMAC_DA_SHIFT;
60
+	return 0;
61
+}
5162 
5263 static int stmmac_xgmac2_c22_format(struct stmmac_priv *priv, int phyaddr,
5364 				    int phyreg, u32 *hw_addr)
5465 {
55
-	unsigned int mii_data = priv->hw->mii.data;
5666 	u32 tmp;
5767 
5868 	/* HW does not support C22 addr >= 4 */
5969 	if (phyaddr > MII_XGMAC_MAX_C22ADDR)
6070 		return -ENODEV;
61
-	/* Wait until any existing MII operation is complete */
62
-	if (readl_poll_timeout(priv->ioaddr + mii_data, tmp,
63
-			       !(tmp & MII_XGMAC_BUSY), 100, 10000))
64
-		return -EBUSY;
6571 
6672 	/* Set port as Clause 22 */
6773 	tmp = readl(priv->ioaddr + XGMAC_MDIO_C22P);
....@@ -69,7 +75,7 @@
6975 	tmp |= BIT(phyaddr);
7076 	writel(tmp, priv->ioaddr + XGMAC_MDIO_C22P);
7177 
72
-	*hw_addr = (phyaddr << 16) | (phyreg & 0x1f);
78
+	*hw_addr = (phyaddr << MII_XGMAC_PA_SHIFT) | (phyreg & 0x1f);
7379 	return 0;
7480 }
7581 
....@@ -82,22 +88,43 @@
8288 	u32 tmp, addr, value = MII_XGMAC_BUSY;
8389 	int ret;
8490 
91
+	ret = pm_runtime_get_sync(priv->device);
92
+	if (ret < 0) {
93
+		pm_runtime_put_noidle(priv->device);
94
+		return ret;
95
+	}
96
+
97
+	/* Wait until any existing MII operation is complete */
98
+	if (readl_poll_timeout(priv->ioaddr + mii_data, tmp,
99
+			       !(tmp & MII_XGMAC_BUSY), 100, 10000)) {
100
+		ret = -EBUSY;
101
+		goto err_disable_clks;
102
+	}
103
+
85104 	if (phyreg & MII_ADDR_C45) {
86
-		return -EOPNOTSUPP;
105
+		phyreg &= ~MII_ADDR_C45;
106
+
107
+		ret = stmmac_xgmac2_c45_format(priv, phyaddr, phyreg, &addr);
108
+		if (ret)
109
+			goto err_disable_clks;
87110 	} else {
88111 		ret = stmmac_xgmac2_c22_format(priv, phyaddr, phyreg, &addr);
89112 		if (ret)
90
-			return ret;
113
+			goto err_disable_clks;
114
+
115
+		value |= MII_XGMAC_SADDR;
91116 	}
92117 
93118 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
94119 		& priv->hw->mii.clk_csr_mask;
95
-	value |= MII_XGMAC_SADDR | MII_XGMAC_READ;
120
+	value |= MII_XGMAC_READ;
96121 
97122 	/* Wait until any existing MII operation is complete */
98123 	if (readl_poll_timeout(priv->ioaddr + mii_data, tmp,
99
-			       !(tmp & MII_XGMAC_BUSY), 100, 10000))
100
-		return -EBUSY;
124
+			       !(tmp & MII_XGMAC_BUSY), 100, 10000)) {
125
+		ret = -EBUSY;
126
+		goto err_disable_clks;
127
+	}
101128 
102129 	/* Set the MII address register to read */
103130 	writel(addr, priv->ioaddr + mii_address);
....@@ -105,11 +132,18 @@
105132 
106133 	/* Wait until any existing MII operation is complete */
107134 	if (readl_poll_timeout(priv->ioaddr + mii_data, tmp,
108
-			       !(tmp & MII_XGMAC_BUSY), 100, 10000))
109
-		return -EBUSY;
135
+			       !(tmp & MII_XGMAC_BUSY), 100, 10000)) {
136
+		ret = -EBUSY;
137
+		goto err_disable_clks;
138
+	}
110139 
111140 	/* Read the data from the MII data register */
112
-	return readl(priv->ioaddr + mii_data) & GENMASK(15, 0);
141
+	ret = (int)readl(priv->ioaddr + mii_data) & GENMASK(15, 0);
142
+
143
+err_disable_clks:
144
+	pm_runtime_put(priv->device);
145
+
146
+	return ret;
113147 }
114148 
115149 static int stmmac_xgmac2_mdio_write(struct mii_bus *bus, int phyaddr,
....@@ -122,31 +156,57 @@
122156 	u32 addr, tmp, value = MII_XGMAC_BUSY;
123157 	int ret;
124158 
159
+	ret = pm_runtime_get_sync(priv->device);
160
+	if (ret < 0) {
161
+		pm_runtime_put_noidle(priv->device);
162
+		return ret;
163
+	}
164
+
165
+	/* Wait until any existing MII operation is complete */
166
+	if (readl_poll_timeout(priv->ioaddr + mii_data, tmp,
167
+			       !(tmp & MII_XGMAC_BUSY), 100, 10000)) {
168
+		ret = -EBUSY;
169
+		goto err_disable_clks;
170
+	}
171
+
125172 	if (phyreg & MII_ADDR_C45) {
126
-		return -EOPNOTSUPP;
173
+		phyreg &= ~MII_ADDR_C45;
174
+
175
+		ret = stmmac_xgmac2_c45_format(priv, phyaddr, phyreg, &addr);
176
+		if (ret)
177
+			goto err_disable_clks;
127178 	} else {
128179 		ret = stmmac_xgmac2_c22_format(priv, phyaddr, phyreg, &addr);
129180 		if (ret)
130
-			return ret;
181
+			goto err_disable_clks;
182
+
183
+		value |= MII_XGMAC_SADDR;
131184 	}
132185 
133186 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
134187 		& priv->hw->mii.clk_csr_mask;
135
-	value |= phydata | MII_XGMAC_SADDR;
188
+	value |= phydata;
136189 	value |= MII_XGMAC_WRITE;
137190 
138191 	/* Wait until any existing MII operation is complete */
139192 	if (readl_poll_timeout(priv->ioaddr + mii_data, tmp,
140
-			       !(tmp & MII_XGMAC_BUSY), 100, 10000))
141
-		return -EBUSY;
193
+			       !(tmp & MII_XGMAC_BUSY), 100, 10000)) {
194
+		ret = -EBUSY;
195
+		goto err_disable_clks;
196
+	}
142197 
143198 	/* Set the MII address register to write */
144199 	writel(addr, priv->ioaddr + mii_address);
145200 	writel(value, priv->ioaddr + mii_data);
146201 
147202 	/* Wait until any existing MII operation is complete */
148
-	return readl_poll_timeout(priv->ioaddr + mii_data, tmp,
149
-				  !(tmp & MII_XGMAC_BUSY), 100, 10000);
203
+	ret = readl_poll_timeout(priv->ioaddr + mii_data, tmp,
204
+				 !(tmp & MII_XGMAC_BUSY), 100, 10000);
205
+
206
+err_disable_clks:
207
+	pm_runtime_put(priv->device);
208
+
209
+	return ret;
150210 }
151211 
152212 /**
....@@ -165,30 +225,55 @@
165225 	struct stmmac_priv *priv = netdev_priv(ndev);
166226 	unsigned int mii_address = priv->hw->mii.addr;
167227 	unsigned int mii_data = priv->hw->mii.data;
168
-	u32 v;
169
-	int data;
170228 	u32 value = MII_BUSY;
229
+	int data = 0;
230
+	u32 v;
231
+
232
+	data = pm_runtime_get_sync(priv->device);
233
+	if (data < 0) {
234
+		pm_runtime_put_noidle(priv->device);
235
+		return data;
236
+	}
171237 
172238 	value |= (phyaddr << priv->hw->mii.addr_shift)
173239 		& priv->hw->mii.addr_mask;
174240 	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
175241 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
176242 		& priv->hw->mii.clk_csr_mask;
177
-	if (priv->plat->has_gmac4)
243
+	if (priv->plat->has_gmac4) {
178244 		value |= MII_GMAC4_READ;
245
+		if (phyreg & MII_ADDR_C45) {
246
+			value |= MII_GMAC4_C45E;
247
+			value &= ~priv->hw->mii.reg_mask;
248
+			value |= ((phyreg >> MII_DEVADDR_C45_SHIFT) <<
249
+			       priv->hw->mii.reg_shift) &
250
+			       priv->hw->mii.reg_mask;
251
+
252
+			data |= (phyreg & MII_REGADDR_C45_MASK) <<
253
+				MII_GMAC4_REG_ADDR_SHIFT;
254
+		}
255
+	}
179256 
180257 	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
181
-			       100, 10000))
182
-		return -EBUSY;
258
+			       100, 10000)) {
259
+		data = -EBUSY;
260
+		goto err_disable_clks;
261
+	}
183262 
263
+	writel(data, priv->ioaddr + mii_data);
184264 	writel(value, priv->ioaddr + mii_address);
185265 
186266 	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
187
-			       100, 10000))
188
-		return -EBUSY;
267
+			       100, 10000)) {
268
+		data = -EBUSY;
269
+		goto err_disable_clks;
270
+	}
189271 
190272 	/* Read the data from the MII data register */
191
-	data = (int)readl(priv->ioaddr + mii_data);
273
+	data = (int)readl(priv->ioaddr + mii_data) & MII_DATA_MASK;
274
+
275
+err_disable_clks:
276
+	pm_runtime_put(priv->device);
192277 
193278 	return data;
194279 }
....@@ -208,8 +293,15 @@
208293 	struct stmmac_priv *priv = netdev_priv(ndev);
209294 	unsigned int mii_address = priv->hw->mii.addr;
210295 	unsigned int mii_data = priv->hw->mii.data;
211
-	u32 v;
296
+	int ret, data = phydata;
212297 	u32 value = MII_BUSY;
298
+	u32 v;
299
+
300
+	ret = pm_runtime_get_sync(priv->device);
301
+	if (ret < 0) {
302
+		pm_runtime_put_noidle(priv->device);
303
+		return ret;
304
+	}
213305 
214306 	value |= (phyaddr << priv->hw->mii.addr_shift)
215307 		& priv->hw->mii.addr_mask;
....@@ -217,23 +309,41 @@
217309 
218310 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
219311 		& priv->hw->mii.clk_csr_mask;
220
-	if (priv->plat->has_gmac4)
312
+	if (priv->plat->has_gmac4) {
221313 		value |= MII_GMAC4_WRITE;
222
-	else
314
+		if (phyreg & MII_ADDR_C45) {
315
+			value |= MII_GMAC4_C45E;
316
+			value &= ~priv->hw->mii.reg_mask;
317
+			value |= ((phyreg >> MII_DEVADDR_C45_SHIFT) <<
318
+			       priv->hw->mii.reg_shift) &
319
+			       priv->hw->mii.reg_mask;
320
+
321
+			data |= (phyreg & MII_REGADDR_C45_MASK) <<
322
+				MII_GMAC4_REG_ADDR_SHIFT;
323
+		}
324
+	} else {
223325 		value |= MII_WRITE;
326
+	}
224327 
225328 	/* Wait until any existing MII operation is complete */
226329 	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
227
-			       100, 10000))
228
-		return -EBUSY;
330
+			       100, 10000)) {
331
+		ret = -EBUSY;
332
+		goto err_disable_clks;
333
+	}
229334 
230335 	/* Set the MII address register to write */
231
-	writel(phydata, priv->ioaddr + mii_data);
336
+	writel(data, priv->ioaddr + mii_data);
232337 	writel(value, priv->ioaddr + mii_address);
233338 
234339 	/* Wait until any existing MII operation is complete */
235
-	return readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
236
-				  100, 10000);
340
+	ret = readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
341
+				 100, 10000);
342
+
343
+err_disable_clks:
344
+	pm_runtime_put(priv->device);
345
+
346
+	return ret;
237347 }
238348 
239349 /**
....@@ -247,50 +357,34 @@
247357 	struct net_device *ndev = bus->priv;
248358 	struct stmmac_priv *priv = netdev_priv(ndev);
249359 	unsigned int mii_address = priv->hw->mii.addr;
250
-	struct stmmac_mdio_bus_data *data = priv->plat->mdio_bus_data;
251360 
252361 #ifdef CONFIG_OF
253362 	if (priv->device->of_node) {
254
-		if (data->reset_gpio < 0) {
255
-			struct device_node *np = priv->device->of_node;
363
+		struct gpio_desc *reset_gpio;
364
+		u32 delays[3] = { 0, 0, 0 };
256365 
257
-			if (!np)
258
-				return 0;
366
+		reset_gpio = devm_gpiod_get_optional(priv->device,
367
+						     "snps,reset",
368
+						     GPIOD_OUT_LOW);
369
+		if (IS_ERR(reset_gpio))
370
+			return PTR_ERR(reset_gpio);
259371 
260
-			data->reset_gpio = of_get_named_gpio(np,
261
-						"snps,reset-gpio", 0);
262
-			if (data->reset_gpio < 0)
263
-				return 0;
372
+		device_property_read_u32_array(priv->device,
373
+					       "snps,reset-delays-us",
374
+					       delays, ARRAY_SIZE(delays));
264375 
265
-			data->active_low = of_property_read_bool(np,
266
-						"snps,reset-active-low");
267
-			of_property_read_u32_array(np,
268
-				"snps,reset-delays-us", data->delays, 3);
376
+		if (delays[0])
377
+			msleep(DIV_ROUND_UP(delays[0], 1000));
269378 
270
-			if (devm_gpio_request(priv->device, data->reset_gpio,
271
-					      "mdio-reset"))
272
-				return 0;
273
-		}
379
+		gpiod_set_value_cansleep(reset_gpio, 1);
380
+		if (delays[1])
381
+			msleep(DIV_ROUND_UP(delays[1], 1000));
274382 
275
-		gpio_direction_output(data->reset_gpio,
276
-				      data->active_low ? 1 : 0);
277
-		if (data->delays[0])
278
-			msleep(DIV_ROUND_UP(data->delays[0], 1000));
279
-
280
-		gpio_set_value(data->reset_gpio, data->active_low ? 0 : 1);
281
-		if (data->delays[1])
282
-			msleep(DIV_ROUND_UP(data->delays[1], 1000));
283
-
284
-		gpio_set_value(data->reset_gpio, data->active_low ? 1 : 0);
285
-		if (data->delays[2])
286
-			msleep(DIV_ROUND_UP(data->delays[2], 1000));
383
+		gpiod_set_value_cansleep(reset_gpio, 0);
384
+		if (delays[2])
385
+			msleep(DIV_ROUND_UP(delays[2], 1000));
287386 	}
288387 #endif
289
-
290
-	if (data->phy_reset) {
291
-		netdev_dbg(ndev, "stmmac_mdio_reset: calling phy_reset\n");
292
-		data->phy_reset(priv->plat->bsp_priv);
293
-	}
294388 
295389 	/* This is a workaround for problems with the STE101P PHY.
296390 	 * It doesn't complete its reset until at least one clock cycle
....@@ -302,6 +396,7 @@
302396 #endif
303397 	return 0;
304398 }
399
+EXPORT_SYMBOL(stmmac_mdio_reset);
305400 
306401 /**
307402  * stmmac_mdio_register
....@@ -328,11 +423,6 @@
328423 	if (mdio_bus_data->irqs)
329424 		memcpy(new_bus->irq, mdio_bus_data->irqs, sizeof(new_bus->irq));
330425 
331
-#ifdef CONFIG_OF
332
-	if (priv->device->of_node)
333
-		mdio_bus_data->reset_gpio = -1;
334
-#endif
335
-
336426 	new_bus->name = "stmmac";
337427 
338428 	if (priv->plat->has_xgmac) {
....@@ -352,7 +442,17 @@
352442 		max_addr = PHY_MAX_ADDR;
353443 	}
354444 
355
-	new_bus->reset = &stmmac_mdio_reset;
445
+	if (mdio_bus_data->has_xpcs) {
446
+		priv->hw->xpcs = mdio_xpcs_get_ops();
447
+		if (!priv->hw->xpcs) {
448
+			err = -ENODEV;
449
+			goto bus_register_fail;
450
+		}
451
+	}
452
+
453
+	if (mdio_bus_data->needs_reset)
454
+		new_bus->reset = &stmmac_mdio_reset;
455
+
356456 	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%s-%x",
357457 		 new_bus->name, priv->plat->bus_id);
358458 	new_bus->priv = ndev;
....@@ -364,6 +464,10 @@
364464 		dev_err(dev, "Cannot register the MDIO bus\n");
365465 		goto bus_register_fail;
366466 	}
467
+
468
+	/* Looks like we need a dummy read for XGMAC only and C45 PHYs */
469
+	if (priv->plat->has_xgmac)
470
+		stmmac_xgmac2_mdio_read(new_bus, 0, MII_ADDR_C45);
367471 
368472 	if (priv->plat->phy_node || mdio_node)
369473 		goto bus_register_done;
....@@ -399,9 +503,34 @@
399503 
400504 	if (!found && !mdio_node) {
401505 		dev_warn(dev, "No PHY found\n");
402
-		mdiobus_unregister(new_bus);
403
-		mdiobus_free(new_bus);
404
-		return -ENODEV;
506
+		err = -ENODEV;
507
+		goto no_phy_found;
508
+	}
509
+
510
+	/* Try to probe the XPCS by scanning all addresses. */
511
+	if (priv->hw->xpcs) {
512
+		struct mdio_xpcs_args *xpcs = &priv->hw->xpcs_args;
513
+		int ret, mode = priv->plat->phy_interface;
514
+		max_addr = PHY_MAX_ADDR;
515
+
516
+		xpcs->bus = new_bus;
517
+
518
+		found = 0;
519
+		for (addr = 0; addr < max_addr; addr++) {
520
+			xpcs->addr = addr;
521
+
522
+			ret = stmmac_xpcs_probe(priv, xpcs, mode);
523
+			if (!ret) {
524
+				found = 1;
525
+				break;
526
+			}
527
+		}
528
+
529
+		if (!found && !mdio_node) {
530
+			dev_warn(dev, "No XPCS found\n");
531
+			err = -ENODEV;
532
+			goto no_xpcs_found;
533
+		}
405534 	}
406535 
407536 bus_register_done:
....@@ -409,6 +538,9 @@
409538 
410539 	return 0;
411540 
541
+no_xpcs_found:
542
+no_phy_found:
543
+	mdiobus_unregister(new_bus);
412544 bus_register_fail:
413545 	mdiobus_free(new_bus);
414546 	return err;