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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: | |
0179a913 CC |
179 | dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n"); |
180 | ||
181 | return ret; | |
182 | } | |
183 | ||
184 | static const struct devfreq_event_ops exynos_nocp_ops = { | |
185 | .set_event = exynos_nocp_set_event, | |
186 | .get_event = exynos_nocp_get_event, | |
187 | }; | |
188 | ||
189 | static const struct of_device_id exynos_nocp_id_match[] = { | |
190 | { .compatible = "samsung,exynos5420-nocp", }, | |
191 | { /* sentinel */ }, | |
192 | }; | |
ca5c3b21 | 193 | MODULE_DEVICE_TABLE(of, exynos_nocp_id_match); |
0179a913 CC |
194 | |
195 | static struct regmap_config exynos_nocp_regmap_config = { | |
196 | .reg_bits = 32, | |
197 | .val_bits = 32, | |
198 | .reg_stride = 4, | |
199 | .max_register = NOCP_COUNTERS_3_VAL, | |
200 | }; | |
201 | ||
202 | static int exynos_nocp_parse_dt(struct platform_device *pdev, | |
203 | struct exynos_nocp *nocp) | |
204 | { | |
205 | struct device *dev = nocp->dev; | |
206 | struct device_node *np = dev->of_node; | |
207 | struct resource *res; | |
208 | void __iomem *base; | |
209 | ||
210 | if (!np) { | |
211 | dev_err(dev, "failed to find devicetree node\n"); | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
215 | nocp->clk = devm_clk_get(dev, "nocp"); | |
216 | if (IS_ERR(nocp->clk)) | |
217 | nocp->clk = NULL; | |
218 | ||
219 | /* Maps the memory mapped IO to control nocp register */ | |
220 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
0179a913 CC |
221 | base = devm_ioremap_resource(dev, res); |
222 | if (IS_ERR(base)) | |
223 | return PTR_ERR(base); | |
224 | ||
225 | exynos_nocp_regmap_config.max_register = resource_size(res) - 4; | |
226 | ||
227 | nocp->regmap = devm_regmap_init_mmio(dev, base, | |
228 | &exynos_nocp_regmap_config); | |
229 | if (IS_ERR(nocp->regmap)) { | |
230 | dev_err(dev, "failed to initialize regmap\n"); | |
231 | return PTR_ERR(nocp->regmap); | |
232 | } | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static int exynos_nocp_probe(struct platform_device *pdev) | |
238 | { | |
239 | struct device *dev = &pdev->dev; | |
240 | struct device_node *np = dev->of_node; | |
241 | struct exynos_nocp *nocp; | |
242 | int ret; | |
243 | ||
244 | nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL); | |
245 | if (!nocp) | |
246 | return -ENOMEM; | |
247 | ||
248 | nocp->dev = &pdev->dev; | |
249 | ||
250 | /* Parse dt data to get resource */ | |
251 | ret = exynos_nocp_parse_dt(pdev, nocp); | |
252 | if (ret < 0) { | |
253 | dev_err(&pdev->dev, | |
254 | "failed to parse devicetree for resource\n"); | |
255 | return ret; | |
256 | } | |
257 | ||
258 | /* Add devfreq-event device to measure the bandwidth of NoC */ | |
259 | nocp->desc.ops = &exynos_nocp_ops; | |
260 | nocp->desc.driver_data = nocp; | |
261 | nocp->desc.name = np->full_name; | |
262 | nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, &nocp->desc); | |
263 | if (IS_ERR(nocp->edev)) { | |
264 | dev_err(&pdev->dev, | |
265 | "failed to add devfreq-event device\n"); | |
266 | return PTR_ERR(nocp->edev); | |
267 | } | |
268 | platform_set_drvdata(pdev, nocp); | |
269 | ||
973a27c7 AY |
270 | ret = clk_prepare_enable(nocp->clk); |
271 | if (ret) { | |
272 | dev_err(&pdev->dev, "failed to prepare ppmu clock\n"); | |
273 | return ret; | |
274 | } | |
0179a913 CC |
275 | |
276 | pr_info("exynos-nocp: new NoC Probe device registered: %s\n", | |
277 | dev_name(dev)); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int exynos_nocp_remove(struct platform_device *pdev) | |
283 | { | |
284 | struct exynos_nocp *nocp = platform_get_drvdata(pdev); | |
285 | ||
286 | clk_disable_unprepare(nocp->clk); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static struct platform_driver exynos_nocp_driver = { | |
292 | .probe = exynos_nocp_probe, | |
293 | .remove = exynos_nocp_remove, | |
294 | .driver = { | |
295 | .name = "exynos-nocp", | |
296 | .of_match_table = exynos_nocp_id_match, | |
297 | }, | |
298 | }; | |
299 | module_platform_driver(exynos_nocp_driver); | |
300 | ||
301 | MODULE_DESCRIPTION("Exynos NoC (Network on Chip) Probe driver"); | |
302 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); | |
303 | MODULE_LICENSE("GPL"); |