1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2024 Linaro Ltd.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/device.h>
9 #include <linux/gpio/consumer.h>
10 #include <linux/jiffies.h>
11 #include <linux/mod_devicetable.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/pwrseq/provider.h>
17 #include <linux/string.h>
18 #include <linux/types.h>
19
20 struct pwrseq_qcom_wcn_pdata {
21 const char *const *vregs;
22 size_t num_vregs;
23 unsigned int pwup_delay_ms;
24 unsigned int gpio_enable_delay_ms;
25 };
26
27 struct pwrseq_qcom_wcn_ctx {
28 struct pwrseq_device *pwrseq;
29 struct device_node *of_node;
30 const struct pwrseq_qcom_wcn_pdata *pdata;
31 struct regulator_bulk_data *regs;
32 struct gpio_desc *bt_gpio;
33 struct gpio_desc *wlan_gpio;
34 struct clk *clk;
35 unsigned long last_gpio_enable_jf;
36 };
37
pwrseq_qcom_wcn_ensure_gpio_delay(struct pwrseq_qcom_wcn_ctx * ctx)38 static void pwrseq_qcom_wcn_ensure_gpio_delay(struct pwrseq_qcom_wcn_ctx *ctx)
39 {
40 unsigned long diff_jiffies;
41 unsigned int diff_msecs;
42
43 if (!ctx->pdata->gpio_enable_delay_ms)
44 return;
45
46 diff_jiffies = jiffies - ctx->last_gpio_enable_jf;
47 diff_msecs = jiffies_to_msecs(diff_jiffies);
48
49 if (diff_msecs < ctx->pdata->gpio_enable_delay_ms)
50 msleep(ctx->pdata->gpio_enable_delay_ms - diff_msecs);
51 }
52
pwrseq_qcom_wcn_vregs_enable(struct pwrseq_device * pwrseq)53 static int pwrseq_qcom_wcn_vregs_enable(struct pwrseq_device *pwrseq)
54 {
55 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
56
57 return regulator_bulk_enable(ctx->pdata->num_vregs, ctx->regs);
58 }
59
pwrseq_qcom_wcn_vregs_disable(struct pwrseq_device * pwrseq)60 static int pwrseq_qcom_wcn_vregs_disable(struct pwrseq_device *pwrseq)
61 {
62 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
63
64 return regulator_bulk_disable(ctx->pdata->num_vregs, ctx->regs);
65 }
66
67 static const struct pwrseq_unit_data pwrseq_qcom_wcn_vregs_unit_data = {
68 .name = "regulators-enable",
69 .enable = pwrseq_qcom_wcn_vregs_enable,
70 .disable = pwrseq_qcom_wcn_vregs_disable,
71 };
72
pwrseq_qcom_wcn_clk_enable(struct pwrseq_device * pwrseq)73 static int pwrseq_qcom_wcn_clk_enable(struct pwrseq_device *pwrseq)
74 {
75 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
76
77 return clk_prepare_enable(ctx->clk);
78 }
79
pwrseq_qcom_wcn_clk_disable(struct pwrseq_device * pwrseq)80 static int pwrseq_qcom_wcn_clk_disable(struct pwrseq_device *pwrseq)
81 {
82 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
83
84 clk_disable_unprepare(ctx->clk);
85
86 return 0;
87 }
88
89 static const struct pwrseq_unit_data pwrseq_qcom_wcn_clk_unit_data = {
90 .name = "clock-enable",
91 .enable = pwrseq_qcom_wcn_clk_enable,
92 .disable = pwrseq_qcom_wcn_clk_disable,
93 };
94
95 static const struct pwrseq_unit_data *pwrseq_qcom_wcn_unit_deps[] = {
96 &pwrseq_qcom_wcn_vregs_unit_data,
97 &pwrseq_qcom_wcn_clk_unit_data,
98 NULL
99 };
100
pwrseq_qcom_wcn_bt_enable(struct pwrseq_device * pwrseq)101 static int pwrseq_qcom_wcn_bt_enable(struct pwrseq_device *pwrseq)
102 {
103 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
104
105 pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
106 gpiod_set_value_cansleep(ctx->bt_gpio, 1);
107 ctx->last_gpio_enable_jf = jiffies;
108
109 return 0;
110 }
111
pwrseq_qcom_wcn_bt_disable(struct pwrseq_device * pwrseq)112 static int pwrseq_qcom_wcn_bt_disable(struct pwrseq_device *pwrseq)
113 {
114 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
115
116 gpiod_set_value_cansleep(ctx->bt_gpio, 0);
117
118 return 0;
119 }
120
121 static const struct pwrseq_unit_data pwrseq_qcom_wcn_bt_unit_data = {
122 .name = "bluetooth-enable",
123 .deps = pwrseq_qcom_wcn_unit_deps,
124 .enable = pwrseq_qcom_wcn_bt_enable,
125 .disable = pwrseq_qcom_wcn_bt_disable,
126 };
127
pwrseq_qcom_wcn_wlan_enable(struct pwrseq_device * pwrseq)128 static int pwrseq_qcom_wcn_wlan_enable(struct pwrseq_device *pwrseq)
129 {
130 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
131
132 pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
133 gpiod_set_value_cansleep(ctx->wlan_gpio, 1);
134 ctx->last_gpio_enable_jf = jiffies;
135
136 return 0;
137 }
138
pwrseq_qcom_wcn_wlan_disable(struct pwrseq_device * pwrseq)139 static int pwrseq_qcom_wcn_wlan_disable(struct pwrseq_device *pwrseq)
140 {
141 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
142
143 gpiod_set_value_cansleep(ctx->wlan_gpio, 0);
144
145 return 0;
146 }
147
148 static const struct pwrseq_unit_data pwrseq_qcom_wcn_wlan_unit_data = {
149 .name = "wlan-enable",
150 .deps = pwrseq_qcom_wcn_unit_deps,
151 .enable = pwrseq_qcom_wcn_wlan_enable,
152 .disable = pwrseq_qcom_wcn_wlan_disable,
153 };
154
pwrseq_qcom_wcn_pwup_delay(struct pwrseq_device * pwrseq)155 static int pwrseq_qcom_wcn_pwup_delay(struct pwrseq_device *pwrseq)
156 {
157 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
158
159 if (ctx->pdata->pwup_delay_ms)
160 msleep(ctx->pdata->pwup_delay_ms);
161
162 return 0;
163 }
164
165 static const struct pwrseq_target_data pwrseq_qcom_wcn_bt_target_data = {
166 .name = "bluetooth",
167 .unit = &pwrseq_qcom_wcn_bt_unit_data,
168 .post_enable = pwrseq_qcom_wcn_pwup_delay,
169 };
170
171 static const struct pwrseq_target_data pwrseq_qcom_wcn_wlan_target_data = {
172 .name = "wlan",
173 .unit = &pwrseq_qcom_wcn_wlan_unit_data,
174 .post_enable = pwrseq_qcom_wcn_pwup_delay,
175 };
176
177 static const struct pwrseq_target_data *pwrseq_qcom_wcn_targets[] = {
178 &pwrseq_qcom_wcn_bt_target_data,
179 &pwrseq_qcom_wcn_wlan_target_data,
180 NULL
181 };
182
183 static const char *const pwrseq_qca6390_vregs[] = {
184 "vddio",
185 "vddaon",
186 "vddpmu",
187 "vddrfa0p95",
188 "vddrfa1p3",
189 "vddrfa1p9",
190 "vddpcie1p3",
191 "vddpcie1p9",
192 };
193
194 static const struct pwrseq_qcom_wcn_pdata pwrseq_qca6390_of_data = {
195 .vregs = pwrseq_qca6390_vregs,
196 .num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),
197 .pwup_delay_ms = 60,
198 .gpio_enable_delay_ms = 100,
199 };
200
201 static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn6855_of_data = {
202 .vregs = pwrseq_qca6390_vregs,
203 .num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),
204 .pwup_delay_ms = 50,
205 .gpio_enable_delay_ms = 5,
206 };
207
208 static const char *const pwrseq_wcn7850_vregs[] = {
209 "vdd",
210 "vddio",
211 "vddio1p2",
212 "vddaon",
213 "vdddig",
214 "vddrfa1p2",
215 "vddrfa1p8",
216 };
217
218 static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn7850_of_data = {
219 .vregs = pwrseq_wcn7850_vregs,
220 .num_vregs = ARRAY_SIZE(pwrseq_wcn7850_vregs),
221 .pwup_delay_ms = 50,
222 };
223
pwrseq_qcom_wcn_match(struct pwrseq_device * pwrseq,struct device * dev)224 static int pwrseq_qcom_wcn_match(struct pwrseq_device *pwrseq,
225 struct device *dev)
226 {
227 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
228 struct device_node *dev_node = dev->of_node;
229
230 /*
231 * The PMU supplies power to the Bluetooth and WLAN modules. both
232 * consume the PMU AON output so check the presence of the
233 * 'vddaon-supply' property and whether it leads us to the right
234 * device.
235 */
236 if (!of_property_present(dev_node, "vddaon-supply"))
237 return 0;
238
239 struct device_node *reg_node __free(device_node) =
240 of_parse_phandle(dev_node, "vddaon-supply", 0);
241 if (!reg_node)
242 return 0;
243
244 /*
245 * `reg_node` is the PMU AON regulator, its parent is the `regulators`
246 * node and finally its grandparent is the PMU device node that we're
247 * looking for.
248 */
249 if (!reg_node->parent || !reg_node->parent->parent ||
250 reg_node->parent->parent != ctx->of_node)
251 return 0;
252
253 return 1;
254 }
255
pwrseq_qcom_wcn_probe(struct platform_device * pdev)256 static int pwrseq_qcom_wcn_probe(struct platform_device *pdev)
257 {
258 struct device *dev = &pdev->dev;
259 struct pwrseq_qcom_wcn_ctx *ctx;
260 struct pwrseq_config config;
261 int i, ret;
262
263 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
264 if (!ctx)
265 return -ENOMEM;
266
267 ctx->of_node = dev->of_node;
268
269 ctx->pdata = of_device_get_match_data(dev);
270 if (!ctx->pdata)
271 return dev_err_probe(dev, -ENODEV,
272 "Failed to obtain platform data\n");
273
274 ctx->regs = devm_kcalloc(dev, ctx->pdata->num_vregs,
275 sizeof(*ctx->regs), GFP_KERNEL);
276 if (!ctx->regs)
277 return -ENOMEM;
278
279 for (i = 0; i < ctx->pdata->num_vregs; i++)
280 ctx->regs[i].supply = ctx->pdata->vregs[i];
281
282 ret = devm_regulator_bulk_get(dev, ctx->pdata->num_vregs, ctx->regs);
283 if (ret < 0)
284 return dev_err_probe(dev, ret,
285 "Failed to get all regulators\n");
286
287 ctx->bt_gpio = devm_gpiod_get_optional(dev, "bt-enable", GPIOD_OUT_LOW);
288 if (IS_ERR(ctx->bt_gpio))
289 return dev_err_probe(dev, PTR_ERR(ctx->bt_gpio),
290 "Failed to get the Bluetooth enable GPIO\n");
291
292 ctx->wlan_gpio = devm_gpiod_get_optional(dev, "wlan-enable",
293 GPIOD_ASIS);
294 if (IS_ERR(ctx->wlan_gpio))
295 return dev_err_probe(dev, PTR_ERR(ctx->wlan_gpio),
296 "Failed to get the WLAN enable GPIO\n");
297
298 /*
299 * Set direction to output but keep the current value in order to not
300 * disable the WLAN module accidentally if it's already powered on.
301 */
302 gpiod_direction_output(ctx->wlan_gpio,
303 gpiod_get_value_cansleep(ctx->wlan_gpio));
304
305 ctx->clk = devm_clk_get_optional(dev, NULL);
306 if (IS_ERR(ctx->clk))
307 return dev_err_probe(dev, PTR_ERR(ctx->clk),
308 "Failed to get the reference clock\n");
309
310 memset(&config, 0, sizeof(config));
311
312 config.parent = dev;
313 config.owner = THIS_MODULE;
314 config.drvdata = ctx;
315 config.match = pwrseq_qcom_wcn_match;
316 config.targets = pwrseq_qcom_wcn_targets;
317
318 ctx->pwrseq = devm_pwrseq_device_register(dev, &config);
319 if (IS_ERR(ctx->pwrseq))
320 return dev_err_probe(dev, PTR_ERR(ctx->pwrseq),
321 "Failed to register the power sequencer\n");
322
323 return 0;
324 }
325
326 static const struct of_device_id pwrseq_qcom_wcn_of_match[] = {
327 {
328 .compatible = "qcom,qca6390-pmu",
329 .data = &pwrseq_qca6390_of_data,
330 },
331 {
332 .compatible = "qcom,wcn6855-pmu",
333 .data = &pwrseq_wcn6855_of_data,
334 },
335 {
336 .compatible = "qcom,wcn7850-pmu",
337 .data = &pwrseq_wcn7850_of_data,
338 },
339 { }
340 };
341 MODULE_DEVICE_TABLE(of, pwrseq_qcom_wcn_of_match);
342
343 static struct platform_driver pwrseq_qcom_wcn_driver = {
344 .driver = {
345 .name = "pwrseq-qcom_wcn",
346 .of_match_table = pwrseq_qcom_wcn_of_match,
347 },
348 .probe = pwrseq_qcom_wcn_probe,
349 };
350 module_platform_driver(pwrseq_qcom_wcn_driver);
351
352 MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>");
353 MODULE_DESCRIPTION("Qualcomm WCN PMU power sequencing driver");
354 MODULE_LICENSE("GPL");
355