summaryrefslogtreecommitdiffstats
path: root/drivers/phy/phy-brcm-sata.c
blob: 8ffc44afdb75baaceab39801b811d3c3314604e6 (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
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/*
 * Broadcom SATA3 AHCI Controller PHY Driver
 *
 * Copyright (C) 2016 Broadcom
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>

#define SATA_PCB_BANK_OFFSET				0x23c
#define SATA_PCB_REG_OFFSET(ofs)			((ofs) * 4)

#define MAX_PORTS					2

/* Register offset between PHYs in PCB space */
#define SATA_PCB_REG_28NM_SPACE_SIZE			0x1000

/* The older SATA PHY registers duplicated per port registers within the map,
 * rather than having a separate map per port.
 */
#define SATA_PCB_REG_40NM_SPACE_SIZE			0x10

/* Register offset between PHYs in PHY control space */
#define SATA_PHY_CTRL_REG_28NM_SPACE_SIZE		0x8

enum brcm_sata_phy_version {
	BRCM_SATA_PHY_STB_28NM,
	BRCM_SATA_PHY_STB_40NM,
	BRCM_SATA_PHY_IPROC_NS2,
	BRCM_SATA_PHY_IPROC_NSP,
};

struct brcm_sata_port {
	int portnum;
	struct phy *phy;
	struct brcm_sata_phy *phy_priv;
	bool ssc_en;
};

struct brcm_sata_phy {
	struct device *dev;
	void __iomem *phy_base;
	void __iomem *ctrl_base;
	enum brcm_sata_phy_version version;

	struct brcm_sata_port phys[MAX_PORTS];
};

enum sata_phy_regs {
	BLOCK0_REG_BANK				= 0x000,
	BLOCK0_XGXSSTATUS			= 0x81,
	BLOCK0_XGXSSTATUS_PLL_LOCK		= BIT(12),
	BLOCK0_SPARE				= 0x8d,
	BLOCK0_SPARE_OOB_CLK_SEL_MASK		= 0x3,
	BLOCK0_SPARE_OOB_CLK_SEL_REFBY2		= 0x1,

	PLL_REG_BANK_0				= 0x050,
	PLL_REG_BANK_0_PLLCONTROL_0		= 0x81,
	PLLCONTROL_0_FREQ_DET_RESTART		= BIT(13),
	PLLCONTROL_0_FREQ_MONITOR		= BIT(12),
	PLLCONTROL_0_SEQ_START			= BIT(15),
	PLL_CAP_CONTROL				= 0x85,
	PLL_ACTRL2				= 0x8b,
	PLL_ACTRL2_SELDIV_MASK			= 0x1f,
	PLL_ACTRL2_SELDIV_SHIFT			= 9,

	PLL1_REG_BANK				= 0x060,
	PLL1_ACTRL2				= 0x82,
	PLL1_ACTRL3				= 0x83,
	PLL1_ACTRL4				= 0x84,

	OOB_REG_BANK				= 0x150,
	OOB1_REG_BANK				= 0x160,
	OOB_CTRL1				= 0x80,
	OOB_CTRL1_BURST_MAX_MASK		= 0xf,
	OOB_CTRL1_BURST_MAX_SHIFT		= 12,
	OOB_CTRL1_BURST_MIN_MASK		= 0xf,
	OOB_CTRL1_BURST_MIN_SHIFT		= 8,
	OOB_CTRL1_WAKE_IDLE_MAX_MASK		= 0xf,
	OOB_CTRL1_WAKE_IDLE_MAX_SHIFT		= 4,
	OOB_CTRL1_WAKE_IDLE_MIN_MASK		= 0xf,
	OOB_CTRL1_WAKE_IDLE_MIN_SHIFT		= 0,
	OOB_CTRL2				= 0x81,
	OOB_CTRL2_SEL_ENA_SHIFT			= 15,
	OOB_CTRL2_SEL_ENA_RC_SHIFT		= 14,
	OOB_CTRL2_RESET_IDLE_MAX_MASK		= 0x3f,
	OOB_CTRL2_RESET_IDLE_MAX_SHIFT		= 8,
	OOB_CTRL2_BURST_CNT_MASK		= 0x3,
	OOB_CTRL2_BURST_CNT_SHIFT		= 6,
	OOB_CTRL2_RESET_IDLE_MIN_MASK		= 0x3f,
	OOB_CTRL2_RESET_IDLE_MIN_SHIFT		= 0,

	TXPMD_REG_BANK				= 0x1a0,
	TXPMD_CONTROL1				= 0x81,
	TXPMD_CONTROL1_TX_SSC_EN_FRC		= BIT(0),
	TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL	= BIT(1),
	TXPMD_TX_FREQ_CTRL_CONTROL1		= 0x82,
	TXPMD_TX_FREQ_CTRL_CONTROL2		= 0x83,
	TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK	= 0x3ff,
	TXPMD_TX_FREQ_CTRL_CONTROL3		= 0x84,
	TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK	= 0x3ff,
};

enum sata_phy_ctrl_regs {
	PHY_CTRL_1				= 0x0,
	PHY_CTRL_1_RESET			= BIT(0),
};

static inline void __iomem *brcm_sata_pcb_base(struct brcm_sata_port *port)
{
	struct brcm_sata_phy *priv = port->phy_priv;
	u32 size = 0;

	switch (priv->version) {
	case BRCM_SATA_PHY_STB_28NM:
	case BRCM_SATA_PHY_IPROC_NS2:
		size = SATA_PCB_REG_28NM_SPACE_SIZE;
		break;
	case BRCM_SATA_PHY_STB_40NM:
		size = SATA_PCB_REG_40NM_SPACE_SIZE;
		break;
	default:
		dev_err(priv->dev, "invalid phy version\n");
		break;
	};

	return priv->phy_base + (port->portnum * size);
}

static inline void __iomem *brcm_sata_ctrl_base(struct brcm_sata_port *port)
{
	struct brcm_sata_phy *priv = port->phy_priv;
	u32 size = 0;

	switch (priv->version) {
	case BRCM_SATA_PHY_IPROC_NS2:
		size = SATA_PHY_CTRL_REG_28NM_SPACE_SIZE;
		break;
	default:
		dev_err(priv->dev, "invalid phy version\n");
		break;
	};

	return priv->ctrl_base + (port->portnum * size);
}

static void brcm_sata_phy_wr(void __iomem *pcb_base, u32 bank,
			     u32 ofs, u32 msk, u32 value)
{
	u32 tmp;

	writel(bank, pcb_base + SATA_PCB_BANK_OFFSET);
	tmp = readl(pcb_base + SATA_PCB_REG_OFFSET(ofs));
	tmp = (tmp & msk) | value;
	writel(tmp, pcb_base + SATA_PCB_REG_OFFSET(ofs));
}

static u32 brcm_sata_phy_rd(void __iomem *pcb_base, u32 bank, u32 ofs)
{
	writel(bank, pcb_base + SATA_PCB_BANK_OFFSET);
	return readl(pcb_base + SATA_PCB_REG_OFFSET(ofs));
}

/* These defaults were characterized by H/W group */
#define STB_FMIN_VAL_DEFAULT	0x3df
#define STB_FMAX_VAL_DEFAULT	0x3df
#define STB_FMAX_VAL_SSC	0x83

static int brcm_stb_sata_init(struct brcm_sata_port *port)
{
	void __iomem *base = brcm_sata_pcb_base(port);
	struct brcm_sata_phy *priv = port->phy_priv;
	u32 tmp;

	/* override the TX spread spectrum setting */
	tmp = TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL | TXPMD_CONTROL1_TX_SSC_EN_FRC;
	brcm_sata_phy_wr(base, TXPMD_REG_BANK, TXPMD_CONTROL1, ~tmp, tmp);

	/* set fixed min freq */
	brcm_sata_phy_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL2,
			 ~TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK,
			 STB_FMIN_VAL_DEFAULT);

	/* set fixed max freq depending on SSC config */
	if (port->ssc_en) {
		dev_info(priv->dev, "enabling SSC on port%d\n", port->portnum);
		tmp = STB_FMAX_VAL_SSC;
	} else {
		tmp = STB_FMAX_VAL_DEFAULT;
	}

	brcm_sata_phy_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL3,
			  ~TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK, tmp);

	return 0;
}

/* NS2 SATA PLL1 defaults were characterized by H/W group */
#define NS2_PLL1_ACTRL2_MAGIC	0x1df8
#define NS2_PLL1_ACTRL3_MAGIC	0x2b00
#define NS2_PLL1_ACTRL4_MAGIC	0x8824

static int brcm_ns2_sata_init(struct brcm_sata_port *port)
{
	int try;
	unsigned int val;
	void __iomem *base = brcm_sata_pcb_base(port);
	void __iomem *ctrl_base = brcm_sata_ctrl_base(port);
	struct device *dev = port->phy_priv->dev;

	/* Configure OOB control */
	val = 0x0;
	val |= (0xc << OOB_CTRL1_BURST_MAX_SHIFT);
	val |= (0x4 << OOB_CTRL1_BURST_MIN_SHIFT);
	val |= (0x9 << OOB_CTRL1_WAKE_IDLE_MAX_SHIFT);
	val |= (0x3 << OOB_CTRL1_WAKE_IDLE_MIN_SHIFT);
	brcm_sata_phy_wr(base, OOB_REG_BANK, OOB_CTRL1, 0x0, val);
	val = 0x0;
	val |= (0x1b << OOB_CTRL2_RESET_IDLE_MAX_SHIFT);
	val |= (0x2 << OOB_CTRL2_BURST_CNT_SHIFT);
	val |= (0x9 << OOB_CTRL2_RESET_IDLE_MIN_SHIFT);
	brcm_sata_phy_wr(base, OOB_REG_BANK, OOB_CTRL2, 0x0, val);

	/* Configure PHY PLL register bank 1 */
	val = NS2_PLL1_ACTRL2_MAGIC;
	brcm_sata_phy_wr(base, PLL1_REG_BANK, PLL1_ACTRL2, 0x0, val);
	val = NS2_PLL1_ACTRL3_MAGIC;
	brcm_sata_phy_wr(base, PLL1_REG_BANK, PLL1_ACTRL3, 0x0, val);
	val = NS2_PLL1_ACTRL4_MAGIC;
	brcm_sata_phy_wr(base, PLL1_REG_BANK, PLL1_ACTRL4, 0x0, val);

	/* Configure PHY BLOCK0 register bank */
	/* Set oob_clk_sel to refclk/2 */
	brcm_sata_phy_wr(base, BLOCK0_REG_BANK, BLOCK0_SPARE,
			 ~BLOCK0_SPARE_OOB_CLK_SEL_MASK,
			 BLOCK0_SPARE_OOB_CLK_SEL_REFBY2);

	/* Strobe PHY reset using PHY control register */
	writel(PHY_CTRL_1_RESET, ctrl_base + PHY_CTRL_1);
	mdelay(1);
	writel(0x0, ctrl_base + PHY_CTRL_1);
	mdelay(1);

	/* Wait for PHY PLL lock by polling pll_lock bit */
	try = 50;
	while (try) {
		val = brcm_sata_phy_rd(base, BLOCK0_REG_BANK,
					BLOCK0_XGXSSTATUS);
		if (val & BLOCK0_XGXSSTATUS_PLL_LOCK)
			break;
		msleep(20);
		try--;
	}
	if (!try) {
		/* PLL did not lock; give up */
		dev_err(dev, "port%d PLL did not lock\n", port->portnum);
		return -ETIMEDOUT;
	}

	dev_dbg(dev, "port%d initialized\n", port->portnum);

	return 0;
}

static int brcm_nsp_sata_init(struct brcm_sata_port *port)
{
	struct brcm_sata_phy *priv = port->phy_priv;
	struct device *dev = port->phy_priv->dev;
	void __iomem *base = priv->phy_base;
	unsigned int oob_bank;
	unsigned int val, try;

	/* Configure OOB control */
	if (port->portnum == 0)
		oob_bank = OOB_REG_BANK;
	else if (port->portnum == 1)
		oob_bank = OOB1_REG_BANK;
	else
		return -EINVAL;

	val = 0x0;
	val |= (0x0f << OOB_CTRL1_BURST_MAX_SHIFT);
	val |= (0x06 << OOB_CTRL1_BURST_MIN_SHIFT);
	val |= (0x0f << OOB_CTRL1_WAKE_IDLE_MAX_SHIFT);
	val |= (0x06 << OOB_CTRL1_WAKE_IDLE_MIN_SHIFT);
	brcm_sata_phy_wr(base, oob_bank, OOB_CTRL1, 0x0, val);

	val = 0x0;
	val |= (0x2e << OOB_CTRL2_RESET_IDLE_MAX_SHIFT);
	val |= (0x02 << OOB_CTRL2_BURST_CNT_SHIFT);
	val |= (0x16 << OOB_CTRL2_RESET_IDLE_MIN_SHIFT);
	brcm_sata_phy_wr(base, oob_bank, OOB_CTRL2, 0x0, val);


	brcm_sata_phy_wr(base, PLL_REG_BANK_0, PLL_ACTRL2,
		~(PLL_ACTRL2_SELDIV_MASK << PLL_ACTRL2_SELDIV_SHIFT),
		0x0c << PLL_ACTRL2_SELDIV_SHIFT);

	brcm_sata_phy_wr(base, PLL_REG_BANK_0, PLL_CAP_CONTROL,
						0xff0, 0x4f0);

	val = PLLCONTROL_0_FREQ_DET_RESTART | PLLCONTROL_0_FREQ_MONITOR;
	brcm_sata_phy_wr(base, PLL_REG_BANK_0, PLL_REG_BANK_0_PLLCONTROL_0,
								~val, val);
	val = PLLCONTROL_0_SEQ_START;
	brcm_sata_phy_wr(base, PLL_REG_BANK_0, PLL_REG_BANK_0_PLLCONTROL_0,
								~val, 0);
	mdelay(10);
	brcm_sata_phy_wr(base, PLL_REG_BANK_0, PLL_REG_BANK_0_PLLCONTROL_0,
								~val, val);

	/* Wait for pll_seq_done bit */
	try = 50;
	while (try--) {
		val = brcm_sata_phy_rd(base, BLOCK0_REG_BANK,
					BLOCK0_XGXSSTATUS);
		if (val & BLOCK0_XGXSSTATUS_PLL_LOCK)
			break;
		msleep(20);
	}
	if (!try) {
		/* PLL did not lock; give up */
		dev_err(dev, "port%d PLL did not lock\n", port->portnum);
		return -ETIMEDOUT;
	}

	dev_dbg(dev, "port%d initialized\n", port->portnum);

	return 0;
}

static int brcm_sata_phy_init(struct phy *phy)
{
	int rc;
	struct brcm_sata_port *port = phy_get_drvdata(phy);

	switch (port->phy_priv->version) {
	case BRCM_SATA_PHY_STB_28NM:
	case BRCM_SATA_PHY_STB_40NM:
		rc = brcm_stb_sata_init(port);
		break;
	case BRCM_SATA_PHY_IPROC_NS2:
		rc = brcm_ns2_sata_init(port);
		break;
	case BRCM_SATA_PHY_IPROC_NSP:
		rc = brcm_nsp_sata_init(port);
		break;
	default:
		rc = -ENODEV;
	};

	return rc;
}

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

static const struct of_device_id brcm_sata_phy_of_match[] = {
	{ .compatible	= "brcm,bcm7445-sata-phy",
	  .data = (void *)BRCM_SATA_PHY_STB_28NM },
	{ .compatible	= "brcm,bcm7425-sata-phy",
	  .data = (void *)BRCM_SATA_PHY_STB_40NM },
	{ .compatible	= "brcm,iproc-ns2-sata-phy",
	  .data = (void *)BRCM_SATA_PHY_IPROC_NS2 },
	{ .compatible = "brcm,iproc-nsp-sata-phy",
	  .data = (void *)BRCM_SATA_PHY_IPROC_NSP },
	{},
};
MODULE_DEVICE_TABLE(of, brcm_sata_phy_of_match);

static int brcm_sata_phy_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *dn = dev->of_node, *child;
	const struct of_device_id *of_id;
	struct brcm_sata_phy *priv;
	struct resource *res;
	struct phy_provider *provider;
	int ret, count = 0;

	if (of_get_child_count(dn) == 0)
		return -ENODEV;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	dev_set_drvdata(dev, priv);
	priv->dev = dev;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
	priv->phy_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->phy_base))
		return PTR_ERR(priv->phy_base);

	of_id = of_match_node(brcm_sata_phy_of_match, dn);
	if (of_id)
		priv->version = (enum brcm_sata_phy_version)of_id->data;
	else
		priv->version = BRCM_SATA_PHY_STB_28NM;

	if (priv->version == BRCM_SATA_PHY_IPROC_NS2) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						   "phy-ctrl");
		priv->ctrl_base = devm_ioremap_resource(dev, res);
		if (IS_ERR(priv->ctrl_base))
			return PTR_ERR(priv->ctrl_base);
	}

	for_each_available_child_of_node(dn, child) {
		unsigned int id;
		struct brcm_sata_port *port;

		if (of_property_read_u32(child, "reg", &id)) {
			dev_err(dev, "missing reg property in node %s\n",
					child->name);
			ret = -EINVAL;
			goto put_child;
		}

		if (id >= MAX_PORTS) {
			dev_err(dev, "invalid reg: %u\n", id);
			ret = -EINVAL;
			goto put_child;
		}
		if (priv->phys[id].phy) {
			dev_err(dev, "already registered port %u\n", id);
			ret = -EINVAL;
			goto put_child;
		}

		port = &priv->phys[id];
		port->portnum = id;
		port->phy_priv = priv;
		port->phy = devm_phy_create(dev, child, &phy_ops);
		port->ssc_en = of_property_read_bool(child, "brcm,enable-ssc");
		if (IS_ERR(port->phy)) {
			dev_err(dev, "failed to create PHY\n");
			ret = PTR_ERR(port->phy);
			goto put_child;
		}

		phy_set_drvdata(port->phy, port);
		count++;
	}

	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	if (IS_ERR(provider)) {
		dev_err(dev, "could not register PHY provider\n");
		return PTR_ERR(provider);
	}

	dev_info(dev, "registered %d port(s)\n", count);

	return 0;
put_child:
	of_node_put(child);
	return ret;
}

static struct platform_driver brcm_sata_phy_driver = {
	.probe	= brcm_sata_phy_probe,
	.driver	= {
		.of_match_table	= brcm_sata_phy_of_match,
		.name		= "brcm-sata-phy",
	}
};
module_platform_driver(brcm_sata_phy_driver);

MODULE_DESCRIPTION("Broadcom SATA PHY driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marc Carino");
MODULE_AUTHOR("Brian Norris");
MODULE_ALIAS("platform:phy-brcm-sata");