summaryrefslogtreecommitdiff
path: root/drivers/phy/broadcom/phy-bcm-ns-usb3.c
blob: 14f45bc35cc5e86805d94a210f6061bfc285783d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Broadcom Northstar USB 3.0 PHY Driver
 *
 * Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
 * Copyright (C) 2016 Broadcom
 *
 * All magic values used for initialization (and related comments) were obtained
 * from Broadcom's SDK:
 * Copyright (c) Broadcom Corp, 2012
 */

#include <linux/bcma/bcma.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/slab.h>

#define BCM_NS_USB3_MII_MNG_TIMEOUT_US	1000	/* usecs */

#define BCM_NS_USB3_PHY_BASE_ADDR_REG	0x1f
#define BCM_NS_USB3_PHY_PLL30_BLOCK	0x8000
#define BCM_NS_USB3_PHY_TX_PMD_BLOCK	0x8040
#define BCM_NS_USB3_PHY_PIPE_BLOCK	0x8060

/* Registers of PLL30 block */
#define BCM_NS_USB3_PLL_CONTROL		0x01
#define BCM_NS_USB3_PLLA_CONTROL0	0x0a
#define BCM_NS_USB3_PLLA_CONTROL1	0x0b

/* Registers of TX PMD block */
#define BCM_NS_USB3_TX_PMD_CONTROL1	0x01

/* Registers of PIPE block */
#define BCM_NS_USB3_LFPS_CMP		0x02
#define BCM_NS_USB3_LFPS_DEGLITCH	0x03

enum bcm_ns_family {
	BCM_NS_UNKNOWN,
	BCM_NS_AX,
	BCM_NS_BX,
};

struct bcm_ns_usb3 {
	struct device *dev;
	enum bcm_ns_family family;
	void __iomem *dmp;
	void __iomem *ccb_mii;
	struct mdio_device *mdiodev;
	struct phy *phy;

	int (*phy_write)(struct bcm_ns_usb3 *usb3, u16 reg, u16 value);
};

static const struct of_device_id bcm_ns_usb3_id_table[] = {
	{
		.compatible = "brcm,ns-ax-usb3-phy",
		.data = (int *)BCM_NS_AX,
	},
	{
		.compatible = "brcm,ns-bx-usb3-phy",
		.data = (int *)BCM_NS_BX,
	},
	{},
};
MODULE_DEVICE_TABLE(of, bcm_ns_usb3_id_table);

static int bcm_ns_usb3_mdio_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
				      u16 value)
{
	return usb3->phy_write(usb3, reg, value);
}

static int bcm_ns_usb3_phy_init_ns_bx(struct bcm_ns_usb3 *usb3)
{
	int err;

	/* USB3 PLL Block */
	err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
					 BCM_NS_USB3_PHY_PLL30_BLOCK);
	if (err < 0)
		return err;

	/* Assert Ana_Pllseq start */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x1000);

	/* Assert CML Divider ratio to 26 */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400);

	/* Asserting PLL Reset */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0xc000);

	/* Deaaserting PLL Reset */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0x8000);

	/* Deasserting USB3 system reset */
	writel(0, usb3->dmp + BCMA_RESET_CTL);

	/* PLL frequency monitor enable */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x9000);

	/* PIPE Block */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
				   BCM_NS_USB3_PHY_PIPE_BLOCK);

	/* CMPMAX & CMPMINTH setting */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_CMP, 0xf30d);

	/* DEGLITCH MIN & MAX setting */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_DEGLITCH, 0x6302);

	/* TXPMD block */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
				   BCM_NS_USB3_PHY_TX_PMD_BLOCK);

	/* Enabling SSC */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003);

	return 0;
}

static int bcm_ns_usb3_phy_init_ns_ax(struct bcm_ns_usb3 *usb3)
{
	int err;

	/* PLL30 block */
	err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
					 BCM_NS_USB3_PHY_PLL30_BLOCK);
	if (err < 0)
		return err;

	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400);

	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 0x80e0);

	bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x009c);

	/* Enable SSC */
	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
				   BCM_NS_USB3_PHY_TX_PMD_BLOCK);

	bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x21d3);

	bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003);

	/* Deasserting USB3 system reset */
	writel(0, usb3->dmp + BCMA_RESET_CTL);

	return 0;
}

static int bcm_ns_usb3_phy_init(struct phy *phy)
{
	struct bcm_ns_usb3 *usb3 = phy_get_drvdata(phy);
	int err;

	/* Perform USB3 system soft reset */
	writel(BCMA_RESET_CTL_RESET, usb3->dmp + BCMA_RESET_CTL);

	switch (usb3->family) {
	case BCM_NS_AX:
		err = bcm_ns_usb3_phy_init_ns_ax(usb3);
		break;
	case BCM_NS_BX:
		err = bcm_ns_usb3_phy_init_ns_bx(usb3);
		break;
	default:
		WARN_ON(1);
		err = -ENOTSUPP;
	}

	return err;
}

static const struct phy_ops ops = {
	.init		= bcm_ns_usb3_phy_init,
	.owner		= THIS_MODULE,
};

/**************************************************
 * MDIO driver code
 **************************************************/

static int bcm_ns_usb3_mdiodev_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
					 u16 value)
{
	struct mdio_device *mdiodev = usb3->mdiodev;

	return mdiobus_write(mdiodev->bus, mdiodev->addr, reg, value);
}

static int bcm_ns_usb3_mdio_probe(struct mdio_device *mdiodev)
{
	struct device *dev = &mdiodev->dev;
	const struct of_device_id *of_id;
	struct phy_provider *phy_provider;
	struct device_node *syscon_np;
	struct bcm_ns_usb3 *usb3;
	struct resource res;
	int err;

	usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL);
	if (!usb3)
		return -ENOMEM;

	usb3->dev = dev;
	usb3->mdiodev = mdiodev;

	of_id = of_match_device(bcm_ns_usb3_id_table, dev);
	if (!of_id)
		return -EINVAL;
	usb3->family = (enum bcm_ns_family)of_id->data;

	syscon_np = of_parse_phandle(dev->of_node, "usb3-dmp-syscon", 0);
	err = of_address_to_resource(syscon_np, 0, &res);
	of_node_put(syscon_np);
	if (err)
		return err;

	usb3->dmp = devm_ioremap_resource(dev, &res);
	if (IS_ERR(usb3->dmp)) {
		dev_err(dev, "Failed to map DMP regs\n");
		return PTR_ERR(usb3->dmp);
	}

	usb3->phy_write = bcm_ns_usb3_mdiodev_phy_write;

	usb3->phy = devm_phy_create(dev, NULL, &ops);
	if (IS_ERR(usb3->phy)) {
		dev_err(dev, "Failed to create PHY\n");
		return PTR_ERR(usb3->phy);
	}

	phy_set_drvdata(usb3->phy, usb3);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

	return PTR_ERR_OR_ZERO(phy_provider);
}

static struct mdio_driver bcm_ns_usb3_mdio_driver = {
	.mdiodrv = {
		.driver = {
			.name = "bcm_ns_mdio_usb3",
			.of_match_table = bcm_ns_usb3_id_table,
		},
	},
	.probe = bcm_ns_usb3_mdio_probe,
};

/**************************************************
 * Platform driver code
 **************************************************/

static int bcm_ns_usb3_wait_reg(struct bcm_ns_usb3 *usb3, void __iomem *addr,
				u32 mask, u32 value, unsigned long timeout)
{
	unsigned long deadline = jiffies + timeout;
	u32 val;

	do {
		val = readl(addr);
		if ((val & mask) == value)
			return 0;
		cpu_relax();
		udelay(10);
	} while (!time_after_eq(jiffies, deadline));

	dev_err(usb3->dev, "Timeout waiting for register %p\n", addr);

	return -EBUSY;
}

static inline int bcm_ns_usb3_mii_mng_wait_idle(struct bcm_ns_usb3 *usb3)
{
	return bcm_ns_usb3_wait_reg(usb3, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL,
				    0x0100, 0x0000,
				    usecs_to_jiffies(BCM_NS_USB3_MII_MNG_TIMEOUT_US));
}

static int bcm_ns_usb3_platform_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
					  u16 value)
{
	u32 tmp = 0;
	int err;

	err = bcm_ns_usb3_mii_mng_wait_idle(usb3);
	if (err < 0) {
		dev_err(usb3->dev, "Couldn't write 0x%08x value\n", value);
		return err;
	}

	/* TODO: Use a proper MDIO bus layer */
	tmp |= 0x58020000; /* Magic value for MDIO PHY write */
	tmp |= reg << 18;
	tmp |= value;
	writel(tmp, usb3->ccb_mii + BCMA_CCB_MII_MNG_CMD_DATA);

	return bcm_ns_usb3_mii_mng_wait_idle(usb3);
}

static int bcm_ns_usb3_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct of_device_id *of_id;
	struct bcm_ns_usb3 *usb3;
	struct resource *res;
	struct phy_provider *phy_provider;

	usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL);
	if (!usb3)
		return -ENOMEM;

	usb3->dev = dev;

	of_id = of_match_device(bcm_ns_usb3_id_table, dev);
	if (!of_id)
		return -EINVAL;
	usb3->family = (enum bcm_ns_family)of_id->data;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmp");
	usb3->dmp = devm_ioremap_resource(dev, res);
	if (IS_ERR(usb3->dmp)) {
		dev_err(dev, "Failed to map DMP regs\n");
		return PTR_ERR(usb3->dmp);
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ccb-mii");
	usb3->ccb_mii = devm_ioremap_resource(dev, res);
	if (IS_ERR(usb3->ccb_mii)) {
		dev_err(dev, "Failed to map ChipCommon B MII regs\n");
		return PTR_ERR(usb3->ccb_mii);
	}

	/* Enable MDIO. Setting MDCDIV as 26  */
	writel(0x0000009a, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL);

	/* Wait for MDIO? */
	udelay(2);

	usb3->phy_write = bcm_ns_usb3_platform_phy_write;

	usb3->phy = devm_phy_create(dev, NULL, &ops);
	if (IS_ERR(usb3->phy)) {
		dev_err(dev, "Failed to create PHY\n");
		return PTR_ERR(usb3->phy);
	}

	phy_set_drvdata(usb3->phy, usb3);
	platform_set_drvdata(pdev, usb3);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	if (!IS_ERR(phy_provider))
		dev_info(dev, "Registered Broadcom Northstar USB 3.0 PHY driver\n");

	return PTR_ERR_OR_ZERO(phy_provider);
}

static struct platform_driver bcm_ns_usb3_driver = {
	.probe		= bcm_ns_usb3_probe,
	.driver = {
		.name = "bcm_ns_usb3",
		.of_match_table = bcm_ns_usb3_id_table,
	},
};

static int __init bcm_ns_usb3_module_init(void)
{
	int err;

	/*
	 * For backward compatibility we register as MDIO and platform driver.
	 * After getting MDIO binding commonly used (e.g. switching all DT files
	 * to use it) we should deprecate the old binding and eventually drop
	 * support for it.
	 */

	err = mdio_driver_register(&bcm_ns_usb3_mdio_driver);
	if (err)
		return err;

	err = platform_driver_register(&bcm_ns_usb3_driver);
	if (err)
		mdio_driver_unregister(&bcm_ns_usb3_mdio_driver);

	return err;
}
module_init(bcm_ns_usb3_module_init);

static void __exit bcm_ns_usb3_module_exit(void)
{
	platform_driver_unregister(&bcm_ns_usb3_driver);
	mdio_driver_unregister(&bcm_ns_usb3_mdio_driver);
}
module_exit(bcm_ns_usb3_module_exit)

MODULE_LICENSE("GPL v2");