pwrseq-qcom-wcn.c

  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
 20struct 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	const struct pwrseq_target_data **targets;
 26};
 27
 28struct pwrseq_qcom_wcn_ctx {
 29	struct pwrseq_device *pwrseq;
 30	struct device_node *of_node;
 31	const struct pwrseq_qcom_wcn_pdata *pdata;
 32	struct regulator_bulk_data *regs;
 33	struct gpio_desc *bt_gpio;
 34	struct gpio_desc *wlan_gpio;
 35	struct gpio_desc *xo_clk_gpio;
 36	struct clk *clk;
 37	unsigned long last_gpio_enable_jf;
 38};
 39
 40static void pwrseq_qcom_wcn_ensure_gpio_delay(struct pwrseq_qcom_wcn_ctx *ctx)
 41{
 42	unsigned long diff_jiffies;
 43	unsigned int diff_msecs;
 44
 45	if (!ctx->pdata->gpio_enable_delay_ms)
 46		return;
 47
 48	diff_jiffies = jiffies - ctx->last_gpio_enable_jf;
 49	diff_msecs = jiffies_to_msecs(diff_jiffies);
 50
 51	if (diff_msecs < ctx->pdata->gpio_enable_delay_ms)
 52		msleep(ctx->pdata->gpio_enable_delay_ms - diff_msecs);
 53}
 54
 55static int pwrseq_qcom_wcn_vregs_enable(struct pwrseq_device *pwrseq)
 56{
 57	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 58
 59	return regulator_bulk_enable(ctx->pdata->num_vregs, ctx->regs);
 60}
 61
 62static int pwrseq_qcom_wcn_vregs_disable(struct pwrseq_device *pwrseq)
 63{
 64	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 65
 66	return regulator_bulk_disable(ctx->pdata->num_vregs, ctx->regs);
 67}
 68
 69static const struct pwrseq_unit_data pwrseq_qcom_wcn_vregs_unit_data = {
 70	.name = "regulators-enable",
 71	.enable = pwrseq_qcom_wcn_vregs_enable,
 72	.disable = pwrseq_qcom_wcn_vregs_disable,
 73};
 74
 75static int pwrseq_qcom_wcn_clk_enable(struct pwrseq_device *pwrseq)
 76{
 77	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 78
 79	return clk_prepare_enable(ctx->clk);
 80}
 81
 82static int pwrseq_qcom_wcn_clk_disable(struct pwrseq_device *pwrseq)
 83{
 84	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 85
 86	clk_disable_unprepare(ctx->clk);
 87
 88	return 0;
 89}
 90
 91static const struct pwrseq_unit_data pwrseq_qcom_wcn_clk_unit_data = {
 92	.name = "clock-enable",
 93	.enable = pwrseq_qcom_wcn_clk_enable,
 94	.disable = pwrseq_qcom_wcn_clk_disable,
 95};
 96
 97static const struct pwrseq_unit_data *pwrseq_qcom_wcn_unit_deps[] = {
 98	&pwrseq_qcom_wcn_vregs_unit_data,
 99	&pwrseq_qcom_wcn_clk_unit_data,
100	NULL
101};
102
103static int pwrseq_qcom_wcn6855_clk_assert(struct pwrseq_device *pwrseq)
104{
105	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
106
107	if (!ctx->xo_clk_gpio)
108		return 0;
109
110	msleep(1);
111
112	gpiod_set_value_cansleep(ctx->xo_clk_gpio, 1);
113	usleep_range(100, 200);
114
115	return 0;
116}
117
118static const struct pwrseq_unit_data pwrseq_qcom_wcn6855_xo_clk_assert = {
119	.name = "xo-clk-assert",
120	.enable = pwrseq_qcom_wcn6855_clk_assert,
121};
122
123static const struct pwrseq_unit_data *pwrseq_qcom_wcn6855_unit_deps[] = {
124	&pwrseq_qcom_wcn_vregs_unit_data,
125	&pwrseq_qcom_wcn_clk_unit_data,
126	&pwrseq_qcom_wcn6855_xo_clk_assert,
127	NULL
128};
129
130static int pwrseq_qcom_wcn_bt_enable(struct pwrseq_device *pwrseq)
131{
132	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
133
134	pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
135	gpiod_set_value_cansleep(ctx->bt_gpio, 1);
136	ctx->last_gpio_enable_jf = jiffies;
137
138	return 0;
139}
140
141static int pwrseq_qcom_wcn_bt_disable(struct pwrseq_device *pwrseq)
142{
143	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
144
145	gpiod_set_value_cansleep(ctx->bt_gpio, 0);
146
147	return 0;
148}
149
150static const struct pwrseq_unit_data pwrseq_qcom_wcn_bt_unit_data = {
151	.name = "bluetooth-enable",
152	.deps = pwrseq_qcom_wcn_unit_deps,
153	.enable = pwrseq_qcom_wcn_bt_enable,
154	.disable = pwrseq_qcom_wcn_bt_disable,
155};
156
157static const struct pwrseq_unit_data pwrseq_qcom_wcn6855_bt_unit_data = {
158	.name = "bluetooth-enable",
159	.deps = pwrseq_qcom_wcn6855_unit_deps,
160	.enable = pwrseq_qcom_wcn_bt_enable,
161	.disable = pwrseq_qcom_wcn_bt_disable,
162};
163
164static int pwrseq_qcom_wcn_wlan_enable(struct pwrseq_device *pwrseq)
165{
166	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
167
168	pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
169	gpiod_set_value_cansleep(ctx->wlan_gpio, 1);
170	ctx->last_gpio_enable_jf = jiffies;
171
172	return 0;
173}
174
175static int pwrseq_qcom_wcn_wlan_disable(struct pwrseq_device *pwrseq)
176{
177	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
178
179	gpiod_set_value_cansleep(ctx->wlan_gpio, 0);
180
181	return 0;
182}
183
184static const struct pwrseq_unit_data pwrseq_qcom_wcn_wlan_unit_data = {
185	.name = "wlan-enable",
186	.deps = pwrseq_qcom_wcn_unit_deps,
187	.enable = pwrseq_qcom_wcn_wlan_enable,
188	.disable = pwrseq_qcom_wcn_wlan_disable,
189};
190
191static const struct pwrseq_unit_data pwrseq_qcom_wcn6855_wlan_unit_data = {
192	.name = "wlan-enable",
193	.deps = pwrseq_qcom_wcn6855_unit_deps,
194	.enable = pwrseq_qcom_wcn_wlan_enable,
195	.disable = pwrseq_qcom_wcn_wlan_disable,
196};
197
198static int pwrseq_qcom_wcn_pwup_delay(struct pwrseq_device *pwrseq)
199{
200	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
201
202	if (ctx->pdata->pwup_delay_ms)
203		msleep(ctx->pdata->pwup_delay_ms);
204
205	return 0;
206}
207
208static int pwrseq_qcom_wcn6855_xo_clk_deassert(struct pwrseq_device *pwrseq)
209{
210	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
211
212	if (ctx->xo_clk_gpio) {
213		usleep_range(2000, 5000);
214		gpiod_set_value_cansleep(ctx->xo_clk_gpio, 0);
215	}
216
217	return pwrseq_qcom_wcn_pwup_delay(pwrseq);
218}
219
220static const struct pwrseq_target_data pwrseq_qcom_wcn_bt_target_data = {
221	.name = "bluetooth",
222	.unit = &pwrseq_qcom_wcn_bt_unit_data,
223	.post_enable = pwrseq_qcom_wcn_pwup_delay,
224};
225
226static const struct pwrseq_target_data pwrseq_qcom_wcn_wlan_target_data = {
227	.name = "wlan",
228	.unit = &pwrseq_qcom_wcn_wlan_unit_data,
229	.post_enable = pwrseq_qcom_wcn_pwup_delay,
230};
231
232static const struct pwrseq_target_data pwrseq_qcom_wcn6855_bt_target_data = {
233	.name = "bluetooth",
234	.unit = &pwrseq_qcom_wcn6855_bt_unit_data,
235	.post_enable = pwrseq_qcom_wcn6855_xo_clk_deassert,
236};
237
238static const struct pwrseq_target_data pwrseq_qcom_wcn6855_wlan_target_data = {
239	.name = "wlan",
240	.unit = &pwrseq_qcom_wcn6855_wlan_unit_data,
241	.post_enable = pwrseq_qcom_wcn6855_xo_clk_deassert,
242};
243
244static const struct pwrseq_target_data *pwrseq_qcom_wcn_targets[] = {
245	&pwrseq_qcom_wcn_bt_target_data,
246	&pwrseq_qcom_wcn_wlan_target_data,
247	NULL
248};
249
250static const struct pwrseq_target_data *pwrseq_qcom_wcn6855_targets[] = {
251	&pwrseq_qcom_wcn6855_bt_target_data,
252	&pwrseq_qcom_wcn6855_wlan_target_data,
253	NULL
254};
255
256static const char *const pwrseq_qca6390_vregs[] = {
257	"vddio",
258	"vddaon",
259	"vddpmu",
260	"vddrfa0p95",
261	"vddrfa1p3",
262	"vddrfa1p9",
263	"vddpcie1p3",
264	"vddpcie1p9",
265};
266
267static const struct pwrseq_qcom_wcn_pdata pwrseq_qca6390_of_data = {
268	.vregs = pwrseq_qca6390_vregs,
269	.num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),
270	.pwup_delay_ms = 60,
271	.gpio_enable_delay_ms = 100,
272	.targets = pwrseq_qcom_wcn_targets,
273};
274
275static const char *const pwrseq_wcn6750_vregs[] = {
276	"vddaon",
277	"vddasd",
278	"vddpmu",
279	"vddrfa0p8",
280	"vddrfa1p2",
281	"vddrfa1p7",
282	"vddrfa2p2",
283};
284
285static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn6750_of_data = {
286	.vregs = pwrseq_wcn6750_vregs,
287	.num_vregs = ARRAY_SIZE(pwrseq_wcn6750_vregs),
288	.pwup_delay_ms = 50,
289	.gpio_enable_delay_ms = 5,
290	.targets = pwrseq_qcom_wcn_targets,
291};
292
293static const char *const pwrseq_wcn6855_vregs[] = {
294	"vddio",
295	"vddaon",
296	"vddpmu",
297	"vddpmumx",
298	"vddpmucx",
299	"vddrfa0p95",
300	"vddrfa1p3",
301	"vddrfa1p9",
302	"vddpcie1p3",
303	"vddpcie1p9",
304};
305
306static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn6855_of_data = {
307	.vregs = pwrseq_wcn6855_vregs,
308	.num_vregs = ARRAY_SIZE(pwrseq_wcn6855_vregs),
309	.pwup_delay_ms = 50,
310	.gpio_enable_delay_ms = 5,
311	.targets = pwrseq_qcom_wcn6855_targets,
312};
313
314static const char *const pwrseq_wcn7850_vregs[] = {
315	"vdd",
316	"vddio",
317	"vddio1p2",
318	"vddaon",
319	"vdddig",
320	"vddrfa1p2",
321	"vddrfa1p8",
322};
323
324static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn7850_of_data = {
325	.vregs = pwrseq_wcn7850_vregs,
326	.num_vregs = ARRAY_SIZE(pwrseq_wcn7850_vregs),
327	.pwup_delay_ms = 50,
328	.targets = pwrseq_qcom_wcn_targets,
329};
330
331static int pwrseq_qcom_wcn_match(struct pwrseq_device *pwrseq,
332				 struct device *dev)
333{
334	struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
335	struct device_node *dev_node = dev->of_node;
336
337	/*
338	 * The PMU supplies power to the Bluetooth and WLAN modules. both
339	 * consume the PMU AON output so check the presence of the
340	 * 'vddaon-supply' property and whether it leads us to the right
341	 * device.
342	 */
343	if (!of_property_present(dev_node, "vddaon-supply"))
344		return PWRSEQ_NO_MATCH;
345
346	struct device_node *reg_node __free(device_node) =
347			of_parse_phandle(dev_node, "vddaon-supply", 0);
348	if (!reg_node)
349		return PWRSEQ_NO_MATCH;
350
351	/*
352	 * `reg_node` is the PMU AON regulator, its parent is the `regulators`
353	 * node and finally its grandparent is the PMU device node that we're
354	 * looking for.
355	 */
356	if (!reg_node->parent || !reg_node->parent->parent ||
357	    reg_node->parent->parent != ctx->of_node)
358		return PWRSEQ_NO_MATCH;
359
360	return PWRSEQ_MATCH_OK;
361}
362
363static int pwrseq_qcom_wcn_probe(struct platform_device *pdev)
364{
365	struct device *dev = &pdev->dev;
366	struct pwrseq_qcom_wcn_ctx *ctx;
367	struct pwrseq_config config;
368	int i, ret;
369
370	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
371	if (!ctx)
372		return -ENOMEM;
373
374	ctx->of_node = dev->of_node;
375
376	ctx->pdata = of_device_get_match_data(dev);
377	if (!ctx->pdata)
378		return dev_err_probe(dev, -ENODEV,
379				     "Failed to obtain platform data\n");
380
381	ctx->regs = devm_kcalloc(dev, ctx->pdata->num_vregs,
382				 sizeof(*ctx->regs), GFP_KERNEL);
383	if (!ctx->regs)
384		return -ENOMEM;
385
386	for (i = 0; i < ctx->pdata->num_vregs; i++)
387		ctx->regs[i].supply = ctx->pdata->vregs[i];
388
389	ret = devm_regulator_bulk_get(dev, ctx->pdata->num_vregs, ctx->regs);
390	if (ret < 0)
391		return dev_err_probe(dev, ret,
392				     "Failed to get all regulators\n");
393
394	ctx->bt_gpio = devm_gpiod_get_optional(dev, "bt-enable", GPIOD_OUT_LOW);
395	if (IS_ERR(ctx->bt_gpio))
396		return dev_err_probe(dev, PTR_ERR(ctx->bt_gpio),
397				     "Failed to get the Bluetooth enable GPIO\n");
398
399	/*
400	 * FIXME: This should actually be GPIOD_OUT_LOW, but doing so would
401	 * cause the WLAN power to be toggled, resulting in PCIe link down.
402	 * Since the PCIe controller driver is not handling link down currently,
403	 * the device becomes unusable. So we need to keep this workaround until
404	 * the link down handling is implemented in the controller driver.
405	 */
406	ctx->wlan_gpio = devm_gpiod_get_optional(dev, "wlan-enable",
407						 GPIOD_ASIS);
408	if (IS_ERR(ctx->wlan_gpio))
409		return dev_err_probe(dev, PTR_ERR(ctx->wlan_gpio),
410				     "Failed to get the WLAN enable GPIO\n");
411
412	ctx->xo_clk_gpio = devm_gpiod_get_optional(dev, "xo-clk",
413						   GPIOD_OUT_LOW);
414	if (IS_ERR(ctx->xo_clk_gpio))
415		return dev_err_probe(dev, PTR_ERR(ctx->xo_clk_gpio),
416				     "Failed to get the XO_CLK GPIO\n");
417
418	/*
419	 * Set direction to output but keep the current value in order to not
420	 * disable the WLAN module accidentally if it's already powered on.
421	 */
422	gpiod_direction_output(ctx->wlan_gpio,
423			       gpiod_get_value_cansleep(ctx->wlan_gpio));
424
425	ctx->clk = devm_clk_get_optional(dev, NULL);
426	if (IS_ERR(ctx->clk))
427		return dev_err_probe(dev, PTR_ERR(ctx->clk),
428				     "Failed to get the reference clock\n");
429
430	memset(&config, 0, sizeof(config));
431
432	config.parent = dev;
433	config.owner = THIS_MODULE;
434	config.drvdata = ctx;
435	config.match = pwrseq_qcom_wcn_match;
436	config.targets = ctx->pdata->targets;
437
438	ctx->pwrseq = devm_pwrseq_device_register(dev, &config);
439	if (IS_ERR(ctx->pwrseq))
440		return dev_err_probe(dev, PTR_ERR(ctx->pwrseq),
441				     "Failed to register the power sequencer\n");
442
443	return 0;
444}
445
446static const struct of_device_id pwrseq_qcom_wcn_of_match[] = {
447	{
448		.compatible = "qcom,qca6390-pmu",
449		.data = &pwrseq_qca6390_of_data,
450	},
451	{
452		.compatible = "qcom,wcn6855-pmu",
453		.data = &pwrseq_wcn6855_of_data,
454	},
455	{
456		.compatible = "qcom,wcn7850-pmu",
457		.data = &pwrseq_wcn7850_of_data,
458	},
459	{
460		.compatible = "qcom,wcn6750-pmu",
461		.data = &pwrseq_wcn6750_of_data,
462	},
463	{ }
464};
465MODULE_DEVICE_TABLE(of, pwrseq_qcom_wcn_of_match);
466
467static struct platform_driver pwrseq_qcom_wcn_driver = {
468	.driver = {
469		.name = "pwrseq-qcom_wcn",
470		.of_match_table = pwrseq_qcom_wcn_of_match,
471	},
472	.probe = pwrseq_qcom_wcn_probe,
473};
474module_platform_driver(pwrseq_qcom_wcn_driver);
475
476MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>");
477MODULE_DESCRIPTION("Qualcomm WCN PMU power sequencing driver");
478MODULE_LICENSE("GPL");