[deliverable/linux.git] / drivers / devfreq / event / exynos-nocp.c

/*
 * exynos-nocp.c - EXYNOS NoC (Network On Chip) Probe support
 *
 * Copyright (c) 2016 Samsung Electronics Co., Ltd.
 * Author : Chanwoo Choi <cw00.choi@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/devfreq-event.h>
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include "exynos-nocp.h"

struct exynos_nocp {
	struct devfreq_event_dev *edev;
	struct devfreq_event_desc desc;

	struct device *dev;

	struct regmap *regmap;
	struct clk *clk;
};

/*
 * The devfreq-event ops structure for nocp probe.
 */
static int exynos_nocp_set_event(struct devfreq_event_dev *edev)
{
	struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
	int ret;

	/* Disable NoC probe */
	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
				NOCP_MAIN_CTL_STATEN_MASK, 0);
	if (ret < 0) {
		dev_err(nocp->dev, "failed to disable the NoC probe device\n");
		return ret;
	}

	/* Set a statistics dump period to 0 */
	ret = regmap_write(nocp->regmap, NOCP_STAT_PERIOD, 0x0);
	if (ret < 0)
		goto out;

	/* Set the IntEvent fields of *_SRC */
	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_SRC,
				NOCP_CNT_SRC_INTEVENT_MASK,
				NOCP_CNT_SRC_INTEVENT_BYTE_MASK);
	if (ret < 0)
		goto out;

	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_SRC,
				NOCP_CNT_SRC_INTEVENT_MASK,
				NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
	if (ret < 0)
		goto out;

	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_SRC,
				NOCP_CNT_SRC_INTEVENT_MASK,
				NOCP_CNT_SRC_INTEVENT_CYCLE_MASK);
	if (ret < 0)
		goto out;

	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_SRC,
				NOCP_CNT_SRC_INTEVENT_MASK,
				NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
	if (ret < 0)
		goto out;


	/* Set an alarm with a max/min value of 0 to generate StatALARM */
	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MIN, 0x0);
	if (ret < 0)
		goto out;

	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MAX, 0x0);
	if (ret < 0)
		goto out;

	/* Set AlarmMode */
	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_ALARM_MODE,
				NOCP_CNT_ALARM_MODE_MASK,
				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
	if (ret < 0)
		goto out;

	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_ALARM_MODE,
				NOCP_CNT_ALARM_MODE_MASK,
				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
	if (ret < 0)
		goto out;

	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_ALARM_MODE,
				NOCP_CNT_ALARM_MODE_MASK,
				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
	if (ret < 0)
		goto out;

	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_ALARM_MODE,
				NOCP_CNT_ALARM_MODE_MASK,
				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
	if (ret < 0)
		goto out;

	/* Enable the measurements by setting AlarmEn and StatEn */
	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
			NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK,
			NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK);
	if (ret < 0)
		goto out;

	/* Set GlobalEN */
	ret = regmap_update_bits(nocp->regmap, NOCP_CFG_CTL,
				NOCP_CFG_CTL_GLOBALEN_MASK,
				NOCP_CFG_CTL_GLOBALEN_MASK);
	if (ret < 0)
		goto out;

	/* Enable NoC probe */
	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
				NOCP_MAIN_CTL_STATEN_MASK,
				NOCP_MAIN_CTL_STATEN_MASK);
	if (ret < 0)
		goto out;

	return 0;

out:
	/* Reset NoC probe */
	if (regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
				NOCP_MAIN_CTL_STATEN_MASK, 0)) {
		dev_err(nocp->dev, "Failed to reset NoC probe device\n");
	}

	return ret;
}

static int exynos_nocp_get_event(struct devfreq_event_dev *edev,
				struct devfreq_event_data *edata)
{
	struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
	unsigned int counter[4];
	int ret;

	/* Read cycle count */
	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_0_VAL, &counter[0]);
	if (ret < 0)
		goto out;

	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_1_VAL, &counter[1]);
	if (ret < 0)
		goto out;

	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_2_VAL, &counter[2]);
	if (ret < 0)
		goto out;

	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_3_VAL, &counter[3]);
	if (ret < 0)
		goto out;

	edata->load_count = ((counter[1] << 16) | counter[0]);
	edata->total_count = ((counter[3] << 16) | counter[2]);

	dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
					edata->load_count, edata->total_count);

	return 0;

out:
	edata->load_count = 0;
	edata->total_count = 0;

	dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n");

	return ret;
}

static const struct devfreq_event_ops exynos_nocp_ops = {
	.set_event = exynos_nocp_set_event,
	.get_event = exynos_nocp_get_event,
};

static const struct of_device_id exynos_nocp_id_match[] = {
	{ .compatible = "samsung,exynos5420-nocp", },
	{ /* sentinel */ },
};

static struct regmap_config exynos_nocp_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.max_register = NOCP_COUNTERS_3_VAL,
};

static int exynos_nocp_parse_dt(struct platform_device *pdev,
				struct exynos_nocp *nocp)
{
	struct device *dev = nocp->dev;
	struct device_node *np = dev->of_node;
	struct resource *res;
	void __iomem *base;

	if (!np) {
		dev_err(dev, "failed to find devicetree node\n");
		return -EINVAL;
	}

	nocp->clk = devm_clk_get(dev, "nocp");
	if (IS_ERR(nocp->clk))
		nocp->clk = NULL;

	/* Maps the memory mapped IO to control nocp register */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
		return PTR_ERR(base);

	exynos_nocp_regmap_config.max_register = resource_size(res) - 4;

	nocp->regmap = devm_regmap_init_mmio(dev, base,
					&exynos_nocp_regmap_config);
	if (IS_ERR(nocp->regmap)) {
		dev_err(dev, "failed to initialize regmap\n");
		return PTR_ERR(nocp->regmap);
	}

	return 0;
}

static int exynos_nocp_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct exynos_nocp *nocp;
	int ret;

	nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL);
	if (!nocp)
		return -ENOMEM;

	nocp->dev = &pdev->dev;

	/* Parse dt data to get resource */
	ret = exynos_nocp_parse_dt(pdev, nocp);
	if (ret < 0) {
		dev_err(&pdev->dev,
			"failed to parse devicetree for resource\n");
		return ret;
	}

	/* Add devfreq-event device to measure the bandwidth of NoC */
	nocp->desc.ops = &exynos_nocp_ops;
	nocp->desc.driver_data = nocp;
	nocp->desc.name = np->full_name;
	nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, &nocp->desc);
	if (IS_ERR(nocp->edev)) {
		dev_err(&pdev->dev,
			"failed to add devfreq-event device\n");
		return PTR_ERR(nocp->edev);
	}
	platform_set_drvdata(pdev, nocp);

	clk_prepare_enable(nocp->clk);

	pr_info("exynos-nocp: new NoC Probe device registered: %s\n",
			dev_name(dev));

	return 0;
}

static int exynos_nocp_remove(struct platform_device *pdev)
{
	struct exynos_nocp *nocp = platform_get_drvdata(pdev);

	clk_disable_unprepare(nocp->clk);

	return 0;
}

static struct platform_driver exynos_nocp_driver = {
	.probe	= exynos_nocp_probe,
	.remove	= exynos_nocp_remove,
	.driver = {
		.name	= "exynos-nocp",
		.of_match_table = exynos_nocp_id_match,
	},
};
module_platform_driver(exynos_nocp_driver);

MODULE_DESCRIPTION("Exynos NoC (Network on Chip) Probe driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
0179a913 CC	1	/*
	2	* exynos-nocp.c - EXYNOS NoC (Network On Chip) Probe support
	3	*
	4	* Copyright (c) 2016 Samsung Electronics Co., Ltd.
	5	* Author : Chanwoo Choi <cw00.choi@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/clk.h>
	13	#include <linux/module.h>
	14	#include <linux/devfreq-event.h>
	15	#include <linux/kernel.h>
	16	#include <linux/of_address.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/regmap.h>
	19
	20	#include "exynos-nocp.h"
	21
	22	struct exynos_nocp {
	23	struct devfreq_event_dev *edev;
	24	struct devfreq_event_desc desc;
	25
	26	struct device *dev;
	27
	28	struct regmap *regmap;
	29	struct clk *clk;
	30	};
	31
	32	/*
	33	* The devfreq-event ops structure for nocp probe.
	34	*/
	35	static int exynos_nocp_set_event(struct devfreq_event_dev *edev)
	36	{
	37	struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
	38	int ret;
	39
	40	/* Disable NoC probe */
	41	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
	42	NOCP_MAIN_CTL_STATEN_MASK, 0);
	43	if (ret < 0) {
	44	dev_err(nocp->dev, "failed to disable the NoC probe device\n");
	45	return ret;
	46	}
	47
	48	/* Set a statistics dump period to 0 */
	49	ret = regmap_write(nocp->regmap, NOCP_STAT_PERIOD, 0x0);
	50	if (ret < 0)
	51	goto out;
	52
	53	/* Set the IntEvent fields of _SRC /
	54	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_SRC,
	55	NOCP_CNT_SRC_INTEVENT_MASK,
	56	NOCP_CNT_SRC_INTEVENT_BYTE_MASK);
	57	if (ret < 0)
	58	goto out;
	59
	60	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_SRC,
	61	NOCP_CNT_SRC_INTEVENT_MASK,
	62	NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
	63	if (ret < 0)
	64	goto out;
65
66	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_SRC,
67	NOCP_CNT_SRC_INTEVENT_MASK,
68	NOCP_CNT_SRC_INTEVENT_CYCLE_MASK);
69	if (ret < 0)
70	goto out;
71
72	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_SRC,
73	NOCP_CNT_SRC_INTEVENT_MASK,
74	NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
75	if (ret < 0)
76	goto out;
77
78
79	/* Set an alarm with a max/min value of 0 to generate StatALARM */
80	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MIN, 0x0);
81	if (ret < 0)
82	goto out;
83
84	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MAX, 0x0);
85	if (ret < 0)
86	goto out;
87
88	/* Set AlarmMode */
89	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_ALARM_MODE,
90	NOCP_CNT_ALARM_MODE_MASK,
91	NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
92	if (ret < 0)
93	goto out;
94
95	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_ALARM_MODE,
96	NOCP_CNT_ALARM_MODE_MASK,
97	NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
98	if (ret < 0)
99	goto out;
100
101	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_ALARM_MODE,
102	NOCP_CNT_ALARM_MODE_MASK,
103	NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
104	if (ret < 0)
105	goto out;
106
107	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_ALARM_MODE,
108	NOCP_CNT_ALARM_MODE_MASK,
109	NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
110	if (ret < 0)
111	goto out;
112
113	/* Enable the measurements by setting AlarmEn and StatEn */
114	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
115	NOCP_MAIN_CTL_STATEN_MASK \| NOCP_MAIN_CTL_ALARMEN_MASK,
116	NOCP_MAIN_CTL_STATEN_MASK \| NOCP_MAIN_CTL_ALARMEN_MASK);
117	if (ret < 0)
118	goto out;
119
120	/* Set GlobalEN */
121	ret = regmap_update_bits(nocp->regmap, NOCP_CFG_CTL,
122	NOCP_CFG_CTL_GLOBALEN_MASK,
123	NOCP_CFG_CTL_GLOBALEN_MASK);
124	if (ret < 0)
125	goto out;
126
127	/* Enable NoC probe */
128	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
129	NOCP_MAIN_CTL_STATEN_MASK,
130	NOCP_MAIN_CTL_STATEN_MASK);
131	if (ret < 0)
132	goto out;
133
134	return 0;
135
136	out:
137	/* Reset NoC probe */
138	if (regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
139	NOCP_MAIN_CTL_STATEN_MASK, 0)) {
140	dev_err(nocp->dev, "Failed to reset NoC probe device\n");
141	}
142
143	return ret;
144	}
145
146	static int exynos_nocp_get_event(struct devfreq_event_dev *edev,
147	struct devfreq_event_data *edata)
148	{
149	struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
150	unsigned int counter[4];
151	int ret;
152
153	/* Read cycle count */
154	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_0_VAL, &counter[0]);
155	if (ret < 0)
156	goto out;
157
158	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_1_VAL, &counter[1]);
159	if (ret < 0)
160	goto out;
161
162	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_2_VAL, &counter[2]);
163	if (ret < 0)
164	goto out;
165
166	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_3_VAL, &counter[3]);
167	if (ret < 0)
168	goto out;
169
170	edata->load_count = ((counter[1] << 16) \| counter[0]);
171	edata->total_count = ((counter[3] << 16) \| counter[2]);
172
173	dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
174	edata->load_count, edata->total_count);
175
176	return 0;
177
178	out:
179	edata->load_count = 0;
180	edata->total_count = 0;
181
182	dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n");
183
184	return ret;
185	}
186
187	static const struct devfreq_event_ops exynos_nocp_ops = {
188	.set_event = exynos_nocp_set_event,
189	.get_event = exynos_nocp_get_event,
190	};
191
192	static const struct of_device_id exynos_nocp_id_match[] = {
193	{ .compatible = "samsung,exynos5420-nocp", },
194	{ /* sentinel */ },
195	};
196
197	static struct regmap_config exynos_nocp_regmap_config = {
198	.reg_bits = 32,
199	.val_bits = 32,
200	.reg_stride = 4,
201	.max_register = NOCP_COUNTERS_3_VAL,
202	};
203
204	static int exynos_nocp_parse_dt(struct platform_device *pdev,
205	struct exynos_nocp *nocp)
206	{
207	struct device *dev = nocp->dev;
208	struct device_node *np = dev->of_node;
209	struct resource *res;
210	void __iomem *base;
211
212	if (!np) {
213	dev_err(dev, "failed to find devicetree node\n");
214	return -EINVAL;
215	}
216
217	nocp->clk = devm_clk_get(dev, "nocp");
218	if (IS_ERR(nocp->clk))
219	nocp->clk = NULL;
220
221	/* Maps the memory mapped IO to control nocp register */
222	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0179a913 CC	223	base = devm_ioremap_resource(dev, res);
	224	if (IS_ERR(base))
	225	return PTR_ERR(base);
	226
	227	exynos_nocp_regmap_config.max_register = resource_size(res) - 4;
	228
	229	nocp->regmap = devm_regmap_init_mmio(dev, base,
	230	&exynos_nocp_regmap_config);
	231	if (IS_ERR(nocp->regmap)) {
	232	dev_err(dev, "failed to initialize regmap\n");
	233	return PTR_ERR(nocp->regmap);
	234	}
	235
	236	return 0;
	237	}
	238
	239	static int exynos_nocp_probe(struct platform_device *pdev)
	240	{
	241	struct device *dev = &pdev->dev;
	242	struct device_node *np = dev->of_node;
	243	struct exynos_nocp *nocp;
	244	int ret;
	245
	246	nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL);
	247	if (!nocp)
	248	return -ENOMEM;
	249
	250	nocp->dev = &pdev->dev;
	251
	252	/* Parse dt data to get resource */
	253	ret = exynos_nocp_parse_dt(pdev, nocp);
	254	if (ret < 0) {
	255	dev_err(&pdev->dev,
	256	"failed to parse devicetree for resource\n");
	257	return ret;
	258	}
	259
	260	/* Add devfreq-event device to measure the bandwidth of NoC */
	261	nocp->desc.ops = &exynos_nocp_ops;
	262	nocp->desc.driver_data = nocp;
	263	nocp->desc.name = np->full_name;
	264	nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, &nocp->desc);
	265	if (IS_ERR(nocp->edev)) {
	266	dev_err(&pdev->dev,
	267	"failed to add devfreq-event device\n");
	268	return PTR_ERR(nocp->edev);
	269	}
	270	platform_set_drvdata(pdev, nocp);
	271
	272	clk_prepare_enable(nocp->clk);
	273
	274	pr_info("exynos-nocp: new NoC Probe device registered: %s\n",
	275	dev_name(dev));
	276
	277	return 0;
	278	}
	279
	280	static int exynos_nocp_remove(struct platform_device *pdev)
	281	{
	282	struct exynos_nocp *nocp = platform_get_drvdata(pdev);
	283
	284	clk_disable_unprepare(nocp->clk);
	285
	286	return 0;
287	}
288
289	static struct platform_driver exynos_nocp_driver = {
290	.probe = exynos_nocp_probe,
291	.remove = exynos_nocp_remove,
292	.driver = {
293	.name = "exynos-nocp",
294	.of_match_table = exynos_nocp_id_match,
295	},
296	};
297	module_platform_driver(exynos_nocp_driver);
298
299	MODULE_DESCRIPTION("Exynos NoC (Network on Chip) Probe driver");
300	MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
301	MODULE_LICENSE("GPL");