[linux-2.6-block.git] / drivers / ptp / ptp_dte.c

/*
 * Copyright 2017 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/types.h>

#define DTE_NCO_LOW_TIME_REG	0x00
#define DTE_NCO_TIME_REG	0x04
#define DTE_NCO_OVERFLOW_REG	0x08
#define DTE_NCO_INC_REG		0x0c

#define DTE_NCO_SUM2_MASK	0xffffffff
#define DTE_NCO_SUM2_SHIFT	4ULL

#define DTE_NCO_SUM3_MASK	0xff
#define DTE_NCO_SUM3_SHIFT	36ULL
#define DTE_NCO_SUM3_WR_SHIFT	8

#define DTE_NCO_TS_WRAP_MASK	0xfff
#define DTE_NCO_TS_WRAP_LSHIFT	32

#define DTE_NCO_INC_DEFAULT	0x80000000
#define DTE_NUM_REGS_TO_RESTORE	4

/* Full wrap around is 44bits in ns (~4.887 hrs) */
#define DTE_WRAP_AROUND_NSEC_SHIFT 44

/* 44 bits NCO */
#define DTE_NCO_MAX_NS	0xFFFFFFFFFFFLL

/* 125MHz with 3.29 reg cfg */
#define DTE_PPB_ADJ(ppb) (u32)(div64_u64((((u64)abs(ppb) * BIT(28)) +\
				      62500000ULL), 125000000ULL))

/* ptp dte priv structure */
struct ptp_dte {
	void __iomem *regs;
	struct ptp_clock *ptp_clk;
	struct ptp_clock_info caps;
	struct device *dev;
	u32 ts_ovf_last;
	u32 ts_wrap_cnt;
	spinlock_t lock;
	u32 reg_val[DTE_NUM_REGS_TO_RESTORE];
};

static void dte_write_nco(void __iomem *regs, s64 ns)
{
	u32 sum2, sum3;

	sum2 = (u32)((ns >> DTE_NCO_SUM2_SHIFT) & DTE_NCO_SUM2_MASK);
	/* compensate for ignoring sum1 */
	if (sum2 != DTE_NCO_SUM2_MASK)
		sum2++;

	/* to write sum3, bits [15:8] needs to be written */
	sum3 = (u32)(((ns >> DTE_NCO_SUM3_SHIFT) & DTE_NCO_SUM3_MASK) <<
		     DTE_NCO_SUM3_WR_SHIFT);

	writel(0, (regs + DTE_NCO_LOW_TIME_REG));
	writel(sum2, (regs + DTE_NCO_TIME_REG));
	writel(sum3, (regs + DTE_NCO_OVERFLOW_REG));
}

static s64 dte_read_nco(void __iomem *regs)
{
	u32 sum2, sum3;
	s64 ns;

	/*
	 * ignoring sum1 (4 bits) gives a 16ns resolution, which
	 * works due to the async register read.
	 */
	sum3 = readl(regs + DTE_NCO_OVERFLOW_REG) & DTE_NCO_SUM3_MASK;
	sum2 = readl(regs + DTE_NCO_TIME_REG);
	ns = ((s64)sum3 << DTE_NCO_SUM3_SHIFT) |
		 ((s64)sum2 << DTE_NCO_SUM2_SHIFT);

	return ns;
}

static void dte_write_nco_delta(struct ptp_dte *ptp_dte, s64 delta)
{
	s64 ns;

	ns = dte_read_nco(ptp_dte->regs);

	/* handle wraparound conditions */
	if ((delta < 0) && (abs(delta) > ns)) {
		if (ptp_dte->ts_wrap_cnt) {
			ns += DTE_NCO_MAX_NS + delta;
			ptp_dte->ts_wrap_cnt--;
		} else {
			ns = 0;
		}
	} else {
		ns += delta;
		if (ns > DTE_NCO_MAX_NS) {
			ptp_dte->ts_wrap_cnt++;
			ns -= DTE_NCO_MAX_NS;
		}
	}

	dte_write_nco(ptp_dte->regs, ns);

	ptp_dte->ts_ovf_last = (ns >> DTE_NCO_TS_WRAP_LSHIFT) &
			DTE_NCO_TS_WRAP_MASK;
}

static s64 dte_read_nco_with_ovf(struct ptp_dte *ptp_dte)
{
	u32 ts_ovf;
	s64 ns = 0;

	ns = dte_read_nco(ptp_dte->regs);

	/*Timestamp overflow: 8 LSB bits of sum3, 4 MSB bits of sum2 */
	ts_ovf = (ns >> DTE_NCO_TS_WRAP_LSHIFT) & DTE_NCO_TS_WRAP_MASK;

	/* Check for wrap around */
	if (ts_ovf < ptp_dte->ts_ovf_last)
		ptp_dte->ts_wrap_cnt++;

	ptp_dte->ts_ovf_last = ts_ovf;

	/* adjust for wraparounds */
	ns += (s64)(BIT_ULL(DTE_WRAP_AROUND_NSEC_SHIFT) * ptp_dte->ts_wrap_cnt);

	return ns;
}

static int ptp_dte_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
	u32 nco_incr;
	unsigned long flags;
	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);

	if (abs(ppb) > ptp_dte->caps.max_adj) {
		dev_err(ptp_dte->dev, "ppb adj too big\n");
		return -EINVAL;
	}

	if (ppb < 0)
		nco_incr = DTE_NCO_INC_DEFAULT - DTE_PPB_ADJ(ppb);
	else
		nco_incr = DTE_NCO_INC_DEFAULT + DTE_PPB_ADJ(ppb);

	spin_lock_irqsave(&ptp_dte->lock, flags);
	writel(nco_incr, ptp_dte->regs + DTE_NCO_INC_REG);
	spin_unlock_irqrestore(&ptp_dte->lock, flags);

	return 0;
}

static int ptp_dte_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
	unsigned long flags;
	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);

	spin_lock_irqsave(&ptp_dte->lock, flags);
	dte_write_nco_delta(ptp_dte, delta);
	spin_unlock_irqrestore(&ptp_dte->lock, flags);

	return 0;
}

static int ptp_dte_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
	unsigned long flags;
	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);

	spin_lock_irqsave(&ptp_dte->lock, flags);
	*ts = ns_to_timespec64(dte_read_nco_with_ovf(ptp_dte));
	spin_unlock_irqrestore(&ptp_dte->lock, flags);

	return 0;
}

static int ptp_dte_settime(struct ptp_clock_info *ptp,
			     const struct timespec64 *ts)
{
	unsigned long flags;
	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);

	spin_lock_irqsave(&ptp_dte->lock, flags);

	/* Disable nco increment */
	writel(0, ptp_dte->regs + DTE_NCO_INC_REG);

	dte_write_nco(ptp_dte->regs, timespec64_to_ns(ts));

	/* reset overflow and wrap counter */
	ptp_dte->ts_ovf_last = 0;
	ptp_dte->ts_wrap_cnt = 0;

	/* Enable nco increment */
	writel(DTE_NCO_INC_DEFAULT, ptp_dte->regs + DTE_NCO_INC_REG);

	spin_unlock_irqrestore(&ptp_dte->lock, flags);

	return 0;
}

static int ptp_dte_enable(struct ptp_clock_info *ptp,
			    struct ptp_clock_request *rq, int on)
{
	return -EOPNOTSUPP;
}

static const struct ptp_clock_info ptp_dte_caps = {
	.owner		= THIS_MODULE,
	.name		= "DTE PTP timer",
	.max_adj	= 50000000,
	.n_ext_ts	= 0,
	.n_pins		= 0,
	.pps		= 0,
	.adjfreq	= ptp_dte_adjfreq,
	.adjtime	= ptp_dte_adjtime,
	.gettime64	= ptp_dte_gettime,
	.settime64	= ptp_dte_settime,
	.enable		= ptp_dte_enable,
};

static int ptp_dte_probe(struct platform_device *pdev)
{
	struct ptp_dte *ptp_dte;
	struct device *dev = &pdev->dev;
	struct resource *res;

	ptp_dte = devm_kzalloc(dev, sizeof(struct ptp_dte), GFP_KERNEL);
	if (!ptp_dte)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ptp_dte->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(ptp_dte->regs)) {
		dev_err(dev,
			"%s: io remap failed\n", __func__);
		return PTR_ERR(ptp_dte->regs);
	}

	spin_lock_init(&ptp_dte->lock);

	ptp_dte->dev = dev;
	ptp_dte->caps = ptp_dte_caps;
	ptp_dte->ptp_clk = ptp_clock_register(&ptp_dte->caps, &pdev->dev);
	if (IS_ERR(ptp_dte->ptp_clk)) {
		dev_err(dev,
			"%s: Failed to register ptp clock\n", __func__);
		return PTR_ERR(ptp_dte->ptp_clk);
	}

	platform_set_drvdata(pdev, ptp_dte);

	dev_info(dev, "ptp clk probe done\n");

	return 0;
}

static int ptp_dte_remove(struct platform_device *pdev)
{
	struct ptp_dte *ptp_dte = platform_get_drvdata(pdev);
	u8 i;

	ptp_clock_unregister(ptp_dte->ptp_clk);

	for (i = 0; i < DTE_NUM_REGS_TO_RESTORE; i++)
		writel(0, ptp_dte->regs + (i * sizeof(u32)));

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int ptp_dte_suspend(struct device *dev)
{
	struct ptp_dte *ptp_dte = dev_get_drvdata(dev);
	u8 i;

	for (i = 0; i < DTE_NUM_REGS_TO_RESTORE; i++) {
		ptp_dte->reg_val[i] =
			readl(ptp_dte->regs + (i * sizeof(u32)));
	}

	/* disable the nco */
	writel(0, ptp_dte->regs + DTE_NCO_INC_REG);

	return 0;
}

static int ptp_dte_resume(struct device *dev)
{
	struct ptp_dte *ptp_dte = dev_get_drvdata(dev);
	u8 i;

	for (i = 0; i < DTE_NUM_REGS_TO_RESTORE; i++) {
		if ((i * sizeof(u32)) != DTE_NCO_OVERFLOW_REG)
			writel(ptp_dte->reg_val[i],
				(ptp_dte->regs + (i * sizeof(u32))));
		else
			writel(((ptp_dte->reg_val[i] &
				DTE_NCO_SUM3_MASK) << DTE_NCO_SUM3_WR_SHIFT),
				(ptp_dte->regs + (i * sizeof(u32))));
	}

	return 0;
}

static const struct dev_pm_ops ptp_dte_pm_ops = {
	.suspend = ptp_dte_suspend,
	.resume = ptp_dte_resume
};

#define PTP_DTE_PM_OPS	(&ptp_dte_pm_ops)
#else
#define PTP_DTE_PM_OPS	NULL
#endif

static const struct of_device_id ptp_dte_of_match[] = {
	{ .compatible = "brcm,ptp-dte", },
	{},
};
MODULE_DEVICE_TABLE(of, ptp_dte_of_match);

static struct platform_driver ptp_dte_driver = {
	.driver = {
		.name = "ptp-dte",
		.pm = PTP_DTE_PM_OPS,
		.of_match_table = ptp_dte_of_match,
	},
	.probe    = ptp_dte_probe,
	.remove   = ptp_dte_remove,
};
module_platform_driver(ptp_dte_driver);

MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Broadcom DTE PTP Clock driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
8a56aa10 AP	1	/*
	2	* Copyright 2017 Broadcom
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License as
	6	* published by the Free Software Foundation version 2.
	7	*
	8	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	9	* kind, whether express or implied; without even the implied warranty
	10	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/err.h>
	15	#include <linux/io.h>
	16	#include <linux/module.h>
ac316725	17	#include <linux/mod_devicetable.h>
8a56aa10 AP	18	#include <linux/platform_device.h>
	19	#include <linux/ptp_clock_kernel.h>
	20	#include <linux/types.h>
	21
	22	#define DTE_NCO_LOW_TIME_REG 0x00
	23	#define DTE_NCO_TIME_REG 0x04
	24	#define DTE_NCO_OVERFLOW_REG 0x08
	25	#define DTE_NCO_INC_REG 0x0c
	26
	27	#define DTE_NCO_SUM2_MASK 0xffffffff
	28	#define DTE_NCO_SUM2_SHIFT 4ULL
	29
	30	#define DTE_NCO_SUM3_MASK 0xff
	31	#define DTE_NCO_SUM3_SHIFT 36ULL
	32	#define DTE_NCO_SUM3_WR_SHIFT 8
	33
	34	#define DTE_NCO_TS_WRAP_MASK 0xfff
	35	#define DTE_NCO_TS_WRAP_LSHIFT 32
	36
	37	#define DTE_NCO_INC_DEFAULT 0x80000000
	38	#define DTE_NUM_REGS_TO_RESTORE 4
	39
	40	/* Full wrap around is 44bits in ns (~4.887 hrs) */
	41	#define DTE_WRAP_AROUND_NSEC_SHIFT 44
	42
	43	/* 44 bits NCO */
3d05035e	44	#define DTE_NCO_MAX_NS 0xFFFFFFFFFFFLL
8a56aa10 AP	45
	46	/* 125MHz with 3.29 reg cfg */
	47	#define DTE_PPB_ADJ(ppb) (u32)(div64_u64((((u64)abs(ppb) * BIT(28)) +\
	48	62500000ULL), 125000000ULL))
	49
	50	/* ptp dte priv structure */
	51	struct ptp_dte {
	52	void __iomem *regs;
	53	struct ptp_clock *ptp_clk;
	54	struct ptp_clock_info caps;
	55	struct device *dev;
	56	u32 ts_ovf_last;
	57	u32 ts_wrap_cnt;
	58	spinlock_t lock;
	59	u32 reg_val[DTE_NUM_REGS_TO_RESTORE];
	60	};
	61
	62	static void dte_write_nco(void __iomem *regs, s64 ns)
	63	{
	64	u32 sum2, sum3;
	65
	66	sum2 = (u32)((ns >> DTE_NCO_SUM2_SHIFT) & DTE_NCO_SUM2_MASK);
	67	/* compensate for ignoring sum1 */
	68	if (sum2 != DTE_NCO_SUM2_MASK)
	69	sum2++;
	70
	71	/* to write sum3, bits [15:8] needs to be written */
	72	sum3 = (u32)(((ns >> DTE_NCO_SUM3_SHIFT) & DTE_NCO_SUM3_MASK) <<
	73	DTE_NCO_SUM3_WR_SHIFT);
	74
	75	writel(0, (regs + DTE_NCO_LOW_TIME_REG));
	76	writel(sum2, (regs + DTE_NCO_TIME_REG));
	77	writel(sum3, (regs + DTE_NCO_OVERFLOW_REG));
	78	}
	79
	80	static s64 dte_read_nco(void __iomem *regs)
	81	{
	82	u32 sum2, sum3;
	83	s64 ns;
	84
	85	/*
	86	* ignoring sum1 (4 bits) gives a 16ns resolution, which
	87	* works due to the async register read.
	88	*/
	89	sum3 = readl(regs + DTE_NCO_OVERFLOW_REG) & DTE_NCO_SUM3_MASK;
	90	sum2 = readl(regs + DTE_NCO_TIME_REG);
	91	ns = ((s64)sum3 << DTE_NCO_SUM3_SHIFT) \|
	92	((s64)sum2 << DTE_NCO_SUM2_SHIFT);
	93
	94	return ns;
	95	}
	96
	97	static void dte_write_nco_delta(struct ptp_dte *ptp_dte, s64 delta)
	98	{
	99	s64 ns;
	100
	101	ns = dte_read_nco(ptp_dte->regs);
	102
	103	/* handle wraparound conditions */
	104	if ((delta < 0) && (abs(delta) > ns)) {
	105	if (ptp_dte->ts_wrap_cnt) {
	106	ns += DTE_NCO_MAX_NS + delta;
	107	ptp_dte->ts_wrap_cnt--;
	108	} else {
109	ns = 0;
110	}
111	} else {
112	ns += delta;
113	if (ns > DTE_NCO_MAX_NS) {
114	ptp_dte->ts_wrap_cnt++;
115	ns -= DTE_NCO_MAX_NS;
116	}
117	}
118
119	dte_write_nco(ptp_dte->regs, ns);
120
121	ptp_dte->ts_ovf_last = (ns >> DTE_NCO_TS_WRAP_LSHIFT) &
122	DTE_NCO_TS_WRAP_MASK;
123	}
124
125	static s64 dte_read_nco_with_ovf(struct ptp_dte *ptp_dte)
126	{
127	u32 ts_ovf;
128	s64 ns = 0;
129
130	ns = dte_read_nco(ptp_dte->regs);
131
132	/Timestamp overflow: 8 LSB bits of sum3, 4 MSB bits of sum2 /
133	ts_ovf = (ns >> DTE_NCO_TS_WRAP_LSHIFT) & DTE_NCO_TS_WRAP_MASK;
134
135	/* Check for wrap around */
136	if (ts_ovf < ptp_dte->ts_ovf_last)
137	ptp_dte->ts_wrap_cnt++;
138
139	ptp_dte->ts_ovf_last = ts_ovf;
140
141	/* adjust for wraparounds */
142	ns += (s64)(BIT_ULL(DTE_WRAP_AROUND_NSEC_SHIFT) * ptp_dte->ts_wrap_cnt);
143
144	return ns;
145	}
146
147	static int ptp_dte_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
148	{
149	u32 nco_incr;
150	unsigned long flags;
151	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);
152
153	if (abs(ppb) > ptp_dte->caps.max_adj) {
154	dev_err(ptp_dte->dev, "ppb adj too big\n");
155	return -EINVAL;
156	}
157
158	if (ppb < 0)
159	nco_incr = DTE_NCO_INC_DEFAULT - DTE_PPB_ADJ(ppb);
160	else
161	nco_incr = DTE_NCO_INC_DEFAULT + DTE_PPB_ADJ(ppb);
162
163	spin_lock_irqsave(&ptp_dte->lock, flags);
164	writel(nco_incr, ptp_dte->regs + DTE_NCO_INC_REG);
165	spin_unlock_irqrestore(&ptp_dte->lock, flags);
166
167	return 0;
168	}
169
170	static int ptp_dte_adjtime(struct ptp_clock_info *ptp, s64 delta)
171	{
172	unsigned long flags;
173	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);
174
175	spin_lock_irqsave(&ptp_dte->lock, flags);
176	dte_write_nco_delta(ptp_dte, delta);
177	spin_unlock_irqrestore(&ptp_dte->lock, flags);
178
179	return 0;
180	}
181
182	static int ptp_dte_gettime(struct ptp_clock_info ptp, struct timespec64 ts)
183	{
184	unsigned long flags;
185	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);
186
187	spin_lock_irqsave(&ptp_dte->lock, flags);
188	*ts = ns_to_timespec64(dte_read_nco_with_ovf(ptp_dte));
189	spin_unlock_irqrestore(&ptp_dte->lock, flags);
190
191	return 0;
192	}
193
194	static int ptp_dte_settime(struct ptp_clock_info *ptp,
195	const struct timespec64 *ts)
196	{
197	unsigned long flags;
198	struct ptp_dte *ptp_dte = container_of(ptp, struct ptp_dte, caps);
199
200	spin_lock_irqsave(&ptp_dte->lock, flags);
201
202	/* Disable nco increment */
203	writel(0, ptp_dte->regs + DTE_NCO_INC_REG);
204
205	dte_write_nco(ptp_dte->regs, timespec64_to_ns(ts));
206
207	/* reset overflow and wrap counter */
208	ptp_dte->ts_ovf_last = 0;
209	ptp_dte->ts_wrap_cnt = 0;
210
211	/* Enable nco increment */
212	writel(DTE_NCO_INC_DEFAULT, ptp_dte->regs + DTE_NCO_INC_REG);
213
214	spin_unlock_irqrestore(&ptp_dte->lock, flags);
215
216	return 0;
217	}
218
219	static int ptp_dte_enable(struct ptp_clock_info *ptp,
220	struct ptp_clock_request *rq, int on)
221	{
222	return -EOPNOTSUPP;
223	}
224
7d47e9a2	225	static const struct ptp_clock_info ptp_dte_caps = {
8a56aa10 AP	226	.owner = THIS_MODULE,
	227	.name = "DTE PTP timer",
	228	.max_adj = 50000000,
	229	.n_ext_ts = 0,
	230	.n_pins = 0,
	231	.pps = 0,
	232	.adjfreq = ptp_dte_adjfreq,
	233	.adjtime = ptp_dte_adjtime,
	234	.gettime64 = ptp_dte_gettime,
	235	.settime64 = ptp_dte_settime,
	236	.enable = ptp_dte_enable,
	237	};
	238
	239	static int ptp_dte_probe(struct platform_device *pdev)
	240	{
	241	struct ptp_dte *ptp_dte;
	242	struct device *dev = &pdev->dev;
	243	struct resource *res;
	244
	245	ptp_dte = devm_kzalloc(dev, sizeof(struct ptp_dte), GFP_KERNEL);
	246	if (!ptp_dte)
	247	return -ENOMEM;
	248
	249	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	250	ptp_dte->regs = devm_ioremap_resource(dev, res);
	251	if (IS_ERR(ptp_dte->regs)) {
	252	dev_err(dev,
	253	"%s: io remap failed\n", __func__);
	254	return PTR_ERR(ptp_dte->regs);
	255	}
	256
	257	spin_lock_init(&ptp_dte->lock);
	258
	259	ptp_dte->dev = dev;
	260	ptp_dte->caps = ptp_dte_caps;
	261	ptp_dte->ptp_clk = ptp_clock_register(&ptp_dte->caps, &pdev->dev);
	262	if (IS_ERR(ptp_dte->ptp_clk)) {
	263	dev_err(dev,
	264	"%s: Failed to register ptp clock\n", __func__);
	265	return PTR_ERR(ptp_dte->ptp_clk);
	266	}
	267
	268	platform_set_drvdata(pdev, ptp_dte);
	269
	270	dev_info(dev, "ptp clk probe done\n");
	271
	272	return 0;
	273	}
	274
	275	static int ptp_dte_remove(struct platform_device *pdev)
	276	{
	277	struct ptp_dte *ptp_dte = platform_get_drvdata(pdev);
	278	u8 i;
	279
	280	ptp_clock_unregister(ptp_dte->ptp_clk);
	281
	282	for (i = 0; i < DTE_NUM_REGS_TO_RESTORE; i++)
	283	writel(0, ptp_dte->regs + (i * sizeof(u32)));
	284
	285	return 0;
	286	}
	287
	288	#ifdef CONFIG_PM_SLEEP
	289	static int ptp_dte_suspend(struct device *dev)
290	{
c0bfdae0	291	struct ptp_dte *ptp_dte = dev_get_drvdata(dev);
8a56aa10 AP	292	u8 i;
	293
	294	for (i = 0; i < DTE_NUM_REGS_TO_RESTORE; i++) {
	295	ptp_dte->reg_val[i] =
	296	readl(ptp_dte->regs + (i * sizeof(u32)));
	297	}
	298
	299	/* disable the nco */
	300	writel(0, ptp_dte->regs + DTE_NCO_INC_REG);
	301
	302	return 0;
	303	}
	304
	305	static int ptp_dte_resume(struct device *dev)
	306	{
c0bfdae0	307	struct ptp_dte *ptp_dte = dev_get_drvdata(dev);
8a56aa10 AP	308	u8 i;
	309
	310	for (i = 0; i < DTE_NUM_REGS_TO_RESTORE; i++) {
	311	if ((i * sizeof(u32)) != DTE_NCO_OVERFLOW_REG)
	312	writel(ptp_dte->reg_val[i],
	313	(ptp_dte->regs + (i * sizeof(u32))));
	314	else
	315	writel(((ptp_dte->reg_val[i] &
	316	DTE_NCO_SUM3_MASK) << DTE_NCO_SUM3_WR_SHIFT),
	317	(ptp_dte->regs + (i * sizeof(u32))));
	318	}
	319
	320	return 0;
	321	}
	322
	323	static const struct dev_pm_ops ptp_dte_pm_ops = {
	324	.suspend = ptp_dte_suspend,
	325	.resume = ptp_dte_resume
	326	};
	327
	328	#define PTP_DTE_PM_OPS (&ptp_dte_pm_ops)
	329	#else
	330	#define PTP_DTE_PM_OPS NULL
	331	#endif
	332
	333	static const struct of_device_id ptp_dte_of_match[] = {
	334	{ .compatible = "brcm,ptp-dte", },
	335	{},
	336	};
	337	MODULE_DEVICE_TABLE(of, ptp_dte_of_match);
	338
	339	static struct platform_driver ptp_dte_driver = {
	340	.driver = {
	341	.name = "ptp-dte",
	342	.pm = PTP_DTE_PM_OPS,
	343	.of_match_table = ptp_dte_of_match,
	344	},
	345	.probe = ptp_dte_probe,
	346	.remove = ptp_dte_remove,
	347	};
	348	module_platform_driver(ptp_dte_driver);
	349
	350	MODULE_AUTHOR("Broadcom");
	351	MODULE_DESCRIPTION("Broadcom DTE PTP Clock driver");
	352	MODULE_LICENSE("GPL v2");