summaryrefslogtreecommitdiffstats
path: root/drivers/soc/amlogic/meson-clk-measure.c
blob: daea191a66fa57d1ec9bf2bfaccaae6c0901ba1b (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2018 BayLibre, SAS
 * Author: Neil Armstrong <narmstrong@baylibre.com>
 */

#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/bitfield.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/regmap.h>

#define MSR_CLK_DUTY		0x0
#define MSR_CLK_REG0		0x4
#define MSR_CLK_REG1		0x8
#define MSR_CLK_REG2		0xc

#define MSR_DURATION		GENMASK(15, 0)
#define MSR_ENABLE		BIT(16)
#define MSR_CONT		BIT(17) /* continuous measurement */
#define MSR_INTR		BIT(18) /* interrupts */
#define MSR_RUN			BIT(19)
#define MSR_CLK_SRC		GENMASK(26, 20)
#define MSR_BUSY		BIT(31)

#define MSR_VAL_MASK		GENMASK(15, 0)

#define DIV_MIN			32
#define DIV_STEP		32
#define DIV_MAX			640

#define CLK_MSR_MAX		128

struct meson_msr_id {
	struct meson_msr *priv;
	unsigned int id;
	const char *name;
};

struct meson_msr {
	struct regmap *regmap;
	struct meson_msr_id msr_table[CLK_MSR_MAX];
};

#define CLK_MSR_ID(__id, __name) \
	[__id] = {.id = __id, .name = __name,}

static struct meson_msr_id clk_msr_m8[CLK_MSR_MAX] = {
	CLK_MSR_ID(0, "ring_osc_out_ee0"),
	CLK_MSR_ID(1, "ring_osc_out_ee1"),
	CLK_MSR_ID(2, "ring_osc_out_ee2"),
	CLK_MSR_ID(3, "a9_ring_osck"),
	CLK_MSR_ID(6, "vid_pll"),
	CLK_MSR_ID(7, "clk81"),
	CLK_MSR_ID(8, "encp"),
	CLK_MSR_ID(9, "encl"),
	CLK_MSR_ID(11, "eth_rmii"),
	CLK_MSR_ID(13, "amclk"),
	CLK_MSR_ID(14, "fec_clk_0"),
	CLK_MSR_ID(15, "fec_clk_1"),
	CLK_MSR_ID(16, "fec_clk_2"),
	CLK_MSR_ID(18, "a9_clk_div16"),
	CLK_MSR_ID(19, "hdmi_sys"),
	CLK_MSR_ID(20, "rtc_osc_clk_out"),
	CLK_MSR_ID(21, "i2s_clk_in_src0"),
	CLK_MSR_ID(22, "clk_rmii_from_pad"),
	CLK_MSR_ID(23, "hdmi_ch0_tmds"),
	CLK_MSR_ID(24, "lvds_fifo"),
	CLK_MSR_ID(26, "sc_clk_int"),
	CLK_MSR_ID(28, "sar_adc"),
	CLK_MSR_ID(30, "mpll_clk_test_out"),
	CLK_MSR_ID(31, "audac_clkpi"),
	CLK_MSR_ID(32, "vdac"),
	CLK_MSR_ID(33, "sdhc_rx"),
	CLK_MSR_ID(34, "sdhc_sd"),
	CLK_MSR_ID(35, "mali"),
	CLK_MSR_ID(36, "hdmi_tx_pixel"),
	CLK_MSR_ID(38, "vdin_meas"),
	CLK_MSR_ID(39, "pcm_sclk"),
	CLK_MSR_ID(40, "pcm_mclk"),
	CLK_MSR_ID(41, "eth_rx_tx"),
	CLK_MSR_ID(42, "pwm_d"),
	CLK_MSR_ID(43, "pwm_c"),
	CLK_MSR_ID(44, "pwm_b"),
	CLK_MSR_ID(45, "pwm_a"),
	CLK_MSR_ID(46, "pcm2_sclk"),
	CLK_MSR_ID(47, "ddr_dpll_pt"),
	CLK_MSR_ID(48, "pwm_f"),
	CLK_MSR_ID(49, "pwm_e"),
	CLK_MSR_ID(59, "hcodec"),
	CLK_MSR_ID(60, "usb_32k_alt"),
	CLK_MSR_ID(61, "gpio"),
	CLK_MSR_ID(62, "vid2_pll"),
	CLK_MSR_ID(63, "mipi_csi_cfg"),
};

static struct meson_msr_id clk_msr_gx[CLK_MSR_MAX] = {
	CLK_MSR_ID(0, "ring_osc_out_ee_0"),
	CLK_MSR_ID(1, "ring_osc_out_ee_1"),
	CLK_MSR_ID(2, "ring_osc_out_ee_2"),
	CLK_MSR_ID(3, "a53_ring_osc"),
	CLK_MSR_ID(4, "gp0_pll"),
	CLK_MSR_ID(6, "enci"),
	CLK_MSR_ID(7, "clk81"),
	CLK_MSR_ID(8, "encp"),
	CLK_MSR_ID(9, "encl"),
	CLK_MSR_ID(10, "vdac"),
	CLK_MSR_ID(11, "rgmii_tx"),
	CLK_MSR_ID(12, "pdm"),
	CLK_MSR_ID(13, "amclk"),
	CLK_MSR_ID(14, "fec_0"),
	CLK_MSR_ID(15, "fec_1"),
	CLK_MSR_ID(16, "fec_2"),
	CLK_MSR_ID(17, "sys_pll_div16"),
	CLK_MSR_ID(18, "sys_cpu_div16"),
	CLK_MSR_ID(19, "hdmitx_sys"),
	CLK_MSR_ID(20, "rtc_osc_out"),
	CLK_MSR_ID(21, "i2s_in_src0"),
	CLK_MSR_ID(22, "eth_phy_ref"),
	CLK_MSR_ID(23, "hdmi_todig"),
	CLK_MSR_ID(26, "sc_int"),
	CLK_MSR_ID(28, "sar_adc"),
	CLK_MSR_ID(31, "mpll_test_out"),
	CLK_MSR_ID(32, "vdec"),
	CLK_MSR_ID(35, "mali"),
	CLK_MSR_ID(36, "hdmi_tx_pixel"),
	CLK_MSR_ID(37, "i958"),
	CLK_MSR_ID(38, "vdin_meas"),
	CLK_MSR_ID(39, "pcm_sclk"),
	CLK_MSR_ID(40, "pcm_mclk"),
	CLK_MSR_ID(41, "eth_rx_or_rmii"),
	CLK_MSR_ID(42, "mp0_out"),
	CLK_MSR_ID(43, "fclk_div5"),
	CLK_MSR_ID(44, "pwm_b"),
	CLK_MSR_ID(45, "pwm_a"),
	CLK_MSR_ID(46, "vpu"),
	CLK_MSR_ID(47, "ddr_dpll_pt"),
	CLK_MSR_ID(48, "mp1_out"),
	CLK_MSR_ID(49, "mp2_out"),
	CLK_MSR_ID(50, "mp3_out"),
	CLK_MSR_ID(51, "nand_core"),
	CLK_MSR_ID(52, "sd_emmc_b"),
	CLK_MSR_ID(53, "sd_emmc_a"),
	CLK_MSR_ID(55, "vid_pll_div_out"),
	CLK_MSR_ID(56, "cci"),
	CLK_MSR_ID(57, "wave420l_c"),
	CLK_MSR_ID(58, "wave420l_b"),
	CLK_MSR_ID(59, "hcodec"),
	CLK_MSR_ID(60, "alt_32k"),
	CLK_MSR_ID(61, "gpio_msr"),
	CLK_MSR_ID(62, "hevc"),
	CLK_MSR_ID(66, "vid_lock"),
	CLK_MSR_ID(70, "pwm_f"),
	CLK_MSR_ID(71, "pwm_e"),
	CLK_MSR_ID(72, "pwm_d"),
	CLK_MSR_ID(73, "pwm_c"),
	CLK_MSR_ID(75, "aoclkx2_int"),
	CLK_MSR_ID(76, "aoclk_int"),
	CLK_MSR_ID(77, "rng_ring_osc_0"),
	CLK_MSR_ID(78, "rng_ring_osc_1"),
	CLK_MSR_ID(79, "rng_ring_osc_2"),
	CLK_MSR_ID(80, "rng_ring_osc_3"),
	CLK_MSR_ID(81, "vapb"),
	CLK_MSR_ID(82, "ge2d"),
};

static int meson_measure_id(struct meson_msr_id *clk_msr_id,
			       unsigned int duration)
{
	struct meson_msr *priv = clk_msr_id->priv;
	unsigned int val;
	int ret;

	regmap_write(priv->regmap, MSR_CLK_REG0, 0);

	/* Set measurement duration */
	regmap_update_bits(priv->regmap, MSR_CLK_REG0, MSR_DURATION,
			   FIELD_PREP(MSR_DURATION, duration - 1));

	/* Set ID */
	regmap_update_bits(priv->regmap, MSR_CLK_REG0, MSR_CLK_SRC,
			   FIELD_PREP(MSR_CLK_SRC, clk_msr_id->id));

	/* Enable & Start */
	regmap_update_bits(priv->regmap, MSR_CLK_REG0,
			   MSR_RUN | MSR_ENABLE,
			   MSR_RUN | MSR_ENABLE);

	ret = regmap_read_poll_timeout(priv->regmap, MSR_CLK_REG0,
				       val, !(val & MSR_BUSY), 10, 10000);
	if (ret)
		return ret;

	/* Disable */
	regmap_update_bits(priv->regmap, MSR_CLK_REG0, MSR_ENABLE, 0);

	/* Get the value in multiple of gate time counts */
	regmap_read(priv->regmap, MSR_CLK_REG2, &val);

	if (val >= MSR_VAL_MASK)
		return -EINVAL;

	return DIV_ROUND_CLOSEST_ULL((val & MSR_VAL_MASK) * 1000000ULL,
				     duration);
}

static int meson_measure_best_id(struct meson_msr_id *clk_msr_id,
				    unsigned int *precision)
{
	unsigned int duration = DIV_MAX;
	int ret;

	/* Start from max duration and down to min duration */
	do {
		ret = meson_measure_id(clk_msr_id, duration);
		if (ret >= 0)
			*precision = (2 * 1000000) / duration;
		else
			duration -= DIV_STEP;
	} while (duration >= DIV_MIN && ret == -EINVAL);

	return ret;
}

static int clk_msr_show(struct seq_file *s, void *data)
{
	struct meson_msr_id *clk_msr_id = s->private;
	unsigned int precision = 0;
	int val;

	val = meson_measure_best_id(clk_msr_id, &precision);
	if (val < 0)
		return val;

	seq_printf(s, "%d\t+/-%dHz\n", val, precision);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(clk_msr);

static int clk_msr_summary_show(struct seq_file *s, void *data)
{
	struct meson_msr_id *msr_table = s->private;
	unsigned int precision = 0;
	int val, i;

	seq_puts(s, "  clock                     rate    precision\n");
	seq_puts(s, "---------------------------------------------\n");

	for (i = 0 ; i < CLK_MSR_MAX ; ++i) {
		if (!msr_table[i].name)
			continue;

		val = meson_measure_best_id(&msr_table[i], &precision);
		if (val < 0)
			return val;

		seq_printf(s, " %-20s %10d    +/-%dHz\n",
			   msr_table[i].name, val, precision);
	}

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(clk_msr_summary);

static const struct regmap_config meson_clk_msr_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.max_register = MSR_CLK_REG2,
};

static int meson_msr_probe(struct platform_device *pdev)
{
	const struct meson_msr_id *match_data;
	struct meson_msr *priv;
	struct resource *res;
	struct dentry *root, *clks;
	void __iomem *base;
	int i;

	priv = devm_kzalloc(&pdev->dev, sizeof(struct meson_msr),
			    GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	match_data = device_get_match_data(&pdev->dev);
	if (!match_data) {
		dev_err(&pdev->dev, "failed to get match data\n");
		return -ENODEV;
	}

	memcpy(priv->msr_table, match_data, sizeof(priv->msr_table));

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(base)) {
		dev_err(&pdev->dev, "io resource mapping failed\n");
		return PTR_ERR(base);
	}

	priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
					     &meson_clk_msr_regmap_config);
	if (IS_ERR(priv->regmap))
		return PTR_ERR(priv->regmap);

	root = debugfs_create_dir("meson-clk-msr", NULL);
	clks = debugfs_create_dir("clks", root);

	debugfs_create_file("measure_summary", 0444, root,
			    priv->msr_table, &clk_msr_summary_fops);

	for (i = 0 ; i < CLK_MSR_MAX ; ++i) {
		if (!priv->msr_table[i].name)
			continue;

		priv->msr_table[i].priv = priv;

		debugfs_create_file(priv->msr_table[i].name, 0444, clks,
				    &priv->msr_table[i], &clk_msr_fops);
	}

	return 0;
}

static const struct of_device_id meson_msr_match_table[] = {
	{
		.compatible = "amlogic,meson-gx-clk-measure",
		.data = (void *)clk_msr_gx,
	},
	{
		.compatible = "amlogic,meson8-clk-measure",
		.data = (void *)clk_msr_m8,
	},
	{
		.compatible = "amlogic,meson8b-clk-measure",
		.data = (void *)clk_msr_m8,
	},
	{ /* sentinel */ }
};

static struct platform_driver meson_msr_driver = {
	.probe	= meson_msr_probe,
	.driver = {
		.name		= "meson_msr",
		.of_match_table	= meson_msr_match_table,
	},
};
builtin_platform_driver(meson_msr_driver);