1 // SPDX-License-Identifier: GPL-2.0
3 * Core MFD support for Cirrus Logic Madera codecs
5 * Copyright (C) 2015-2018 Cirrus Logic
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; version 2.
12 #include <linux/device.h>
13 #include <linux/delay.h>
14 #include <linux/err.h>
15 #include <linux/gpio.h>
16 #include <linux/mfd/core.h>
17 #include <linux/module.h>
18 #include <linux/mutex.h>
19 #include <linux/notifier.h>
21 #include <linux/of_gpio.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/regmap.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/regulator/machine.h>
27 #include <linux/regulator/of_regulator.h>
29 #include <linux/mfd/madera/core.h>
30 #include <linux/mfd/madera/registers.h>
34 #define CS47L35_SILICON_ID 0x6360
35 #define CS47L85_SILICON_ID 0x6338
36 #define CS47L90_SILICON_ID 0x6364
38 #define MADERA_32KZ_MCLK2 1
40 static const char * const madera_core_supplies[] = {
45 static const struct mfd_cell madera_ldo1_devs[] = {
46 { .name = "madera-ldo1" },
49 static const char * const cs47l35_supplies[] = {
57 static const struct mfd_cell cs47l35_devs[] = {
58 { .name = "madera-pinctrl", },
59 { .name = "madera-irq", },
60 { .name = "madera-micsupp", },
61 { .name = "madera-gpio", },
63 .name = "madera-extcon",
64 .parent_supplies = cs47l35_supplies,
65 .num_parent_supplies = 1, /* We only need MICVDD */
68 .name = "cs47l35-codec",
69 .parent_supplies = cs47l35_supplies,
70 .num_parent_supplies = ARRAY_SIZE(cs47l35_supplies),
74 static const char * const cs47l85_supplies[] = {
85 static const struct mfd_cell cs47l85_devs[] = {
86 { .name = "madera-pinctrl", },
87 { .name = "madera-irq", },
88 { .name = "madera-micsupp" },
89 { .name = "madera-gpio", },
91 .name = "madera-extcon",
92 .parent_supplies = cs47l85_supplies,
93 .num_parent_supplies = 1, /* We only need MICVDD */
96 .name = "cs47l85-codec",
97 .parent_supplies = cs47l85_supplies,
98 .num_parent_supplies = ARRAY_SIZE(cs47l85_supplies),
102 static const char * const cs47l90_supplies[] = {
111 static const struct mfd_cell cs47l90_devs[] = {
112 { .name = "madera-pinctrl", },
113 { .name = "madera-irq", },
114 { .name = "madera-micsupp", },
115 { .name = "madera-gpio", },
117 .name = "madera-extcon",
118 .parent_supplies = cs47l90_supplies,
119 .num_parent_supplies = 1, /* We only need MICVDD */
122 .name = "cs47l90-codec",
123 .parent_supplies = cs47l90_supplies,
124 .num_parent_supplies = ARRAY_SIZE(cs47l90_supplies),
128 /* Used by madera-i2c and madera-spi drivers */
129 const char *madera_name_from_type(enum madera_type type)
146 EXPORT_SYMBOL_GPL(madera_name_from_type);
148 #define MADERA_BOOT_POLL_INTERVAL_USEC 5000
149 #define MADERA_BOOT_POLL_TIMEOUT_USEC 25000
151 static int madera_wait_for_boot(struct madera *madera)
154 unsigned int val = 0;
158 * We can't use an interrupt as we need to runtime resume to do so,
159 * so we poll the status bit. This won't race with the interrupt
160 * handler because it will be blocked on runtime resume.
161 * The chip could NAK a read request while it is booting so ignore
162 * errors from regmap_read.
164 timeout = ktime_add_us(ktime_get(), MADERA_BOOT_POLL_TIMEOUT_USEC);
165 regmap_read(madera->regmap, MADERA_IRQ1_RAW_STATUS_1, &val);
166 while (!(val & MADERA_BOOT_DONE_STS1) &&
167 !ktime_after(ktime_get(), timeout)) {
168 usleep_range(MADERA_BOOT_POLL_INTERVAL_USEC / 2,
169 MADERA_BOOT_POLL_INTERVAL_USEC);
170 regmap_read(madera->regmap, MADERA_IRQ1_RAW_STATUS_1, &val);
173 if (!(val & MADERA_BOOT_DONE_STS1)) {
174 dev_err(madera->dev, "Polling BOOT_DONE_STS timed out\n");
179 * BOOT_DONE defaults to unmasked on boot so we must ack it.
180 * Do this even after a timeout to avoid interrupt storms.
182 regmap_write(madera->regmap, MADERA_IRQ1_STATUS_1,
183 MADERA_BOOT_DONE_EINT1);
185 pm_runtime_mark_last_busy(madera->dev);
190 static int madera_soft_reset(struct madera *madera)
194 ret = regmap_write(madera->regmap, MADERA_SOFTWARE_RESET, 0);
196 dev_err(madera->dev, "Failed to soft reset device: %d\n", ret);
200 /* Allow time for internal clocks to startup after reset */
201 usleep_range(1000, 2000);
206 static void madera_enable_hard_reset(struct madera *madera)
208 if (!madera->pdata.reset)
212 * There are many existing out-of-tree users of these codecs that we
213 * can't break so preserve the expected behaviour of setting the line
214 * low to assert reset.
216 gpiod_set_raw_value_cansleep(madera->pdata.reset, 0);
219 static void madera_disable_hard_reset(struct madera *madera)
221 if (!madera->pdata.reset)
224 gpiod_set_raw_value_cansleep(madera->pdata.reset, 1);
225 usleep_range(1000, 2000);
228 static int __maybe_unused madera_runtime_resume(struct device *dev)
230 struct madera *madera = dev_get_drvdata(dev);
233 dev_dbg(dev, "Leaving sleep mode\n");
235 ret = regulator_enable(madera->dcvdd);
237 dev_err(dev, "Failed to enable DCVDD: %d\n", ret);
241 regcache_cache_only(madera->regmap, false);
242 regcache_cache_only(madera->regmap_32bit, false);
244 ret = madera_wait_for_boot(madera);
248 ret = regcache_sync(madera->regmap);
250 dev_err(dev, "Failed to restore 16-bit register cache\n");
254 ret = regcache_sync(madera->regmap_32bit);
256 dev_err(dev, "Failed to restore 32-bit register cache\n");
263 regcache_cache_only(madera->regmap_32bit, true);
264 regcache_cache_only(madera->regmap, true);
265 regulator_disable(madera->dcvdd);
270 static int __maybe_unused madera_runtime_suspend(struct device *dev)
272 struct madera *madera = dev_get_drvdata(dev);
274 dev_dbg(madera->dev, "Entering sleep mode\n");
276 regcache_cache_only(madera->regmap, true);
277 regcache_mark_dirty(madera->regmap);
278 regcache_cache_only(madera->regmap_32bit, true);
279 regcache_mark_dirty(madera->regmap_32bit);
281 regulator_disable(madera->dcvdd);
286 const struct dev_pm_ops madera_pm_ops = {
287 SET_RUNTIME_PM_OPS(madera_runtime_suspend,
288 madera_runtime_resume,
291 EXPORT_SYMBOL_GPL(madera_pm_ops);
293 const struct of_device_id madera_of_match[] = {
294 { .compatible = "cirrus,cs47l35", .data = (void *)CS47L35 },
295 { .compatible = "cirrus,cs47l85", .data = (void *)CS47L85 },
296 { .compatible = "cirrus,cs47l90", .data = (void *)CS47L90 },
297 { .compatible = "cirrus,cs47l91", .data = (void *)CS47L91 },
298 { .compatible = "cirrus,wm1840", .data = (void *)WM1840 },
301 MODULE_DEVICE_TABLE(of, madera_of_match);
302 EXPORT_SYMBOL_GPL(madera_of_match);
304 static int madera_get_reset_gpio(struct madera *madera)
306 struct gpio_desc *reset;
309 if (madera->pdata.reset)
312 reset = devm_gpiod_get_optional(madera->dev, "reset", GPIOD_OUT_LOW);
314 ret = PTR_ERR(reset);
315 if (ret != -EPROBE_DEFER)
316 dev_err(madera->dev, "Failed to request /RESET: %d\n",
322 * A hard reset is needed for full reset of the chip. We allow running
323 * without hard reset only because it can be useful for early
324 * prototyping and some debugging, but we need to warn it's not ideal.
327 dev_warn(madera->dev,
328 "Running without reset GPIO is not recommended\n");
330 madera->pdata.reset = reset;
335 static void madera_set_micbias_info(struct madera *madera)
338 * num_childbias is an array because future codecs can have different
339 * childbiases for each micbias. Unspecified values default to 0.
341 switch (madera->type) {
343 madera->num_micbias = 2;
344 madera->num_childbias[0] = 2;
345 madera->num_childbias[1] = 2;
349 madera->num_micbias = 4;
350 /* no child biases */
354 madera->num_micbias = 2;
355 madera->num_childbias[0] = 4;
356 madera->num_childbias[1] = 4;
363 int madera_dev_init(struct madera *madera)
365 struct device *dev = madera->dev;
367 int (*patch_fn)(struct madera *) = NULL;
368 const struct mfd_cell *mfd_devs;
372 dev_set_drvdata(madera->dev, madera);
373 BLOCKING_INIT_NOTIFIER_HEAD(&madera->notifier);
374 mutex_init(&madera->dapm_ptr_lock);
376 madera_set_micbias_info(madera);
379 * We need writable hw config info that all children can share.
380 * Simplest to take one shared copy of pdata struct.
382 if (dev_get_platdata(madera->dev)) {
383 memcpy(&madera->pdata, dev_get_platdata(madera->dev),
384 sizeof(madera->pdata));
387 ret = madera_get_reset_gpio(madera);
391 regcache_cache_only(madera->regmap, true);
392 regcache_cache_only(madera->regmap_32bit, true);
394 for (i = 0; i < ARRAY_SIZE(madera_core_supplies); i++)
395 madera->core_supplies[i].supply = madera_core_supplies[i];
397 madera->num_core_supplies = ARRAY_SIZE(madera_core_supplies);
400 * On some codecs DCVDD could be supplied by the internal LDO1.
401 * For those we must add the LDO1 driver before requesting DCVDD
402 * No devm_ because we need to control shutdown order of children.
404 switch (madera->type) {
411 ret = mfd_add_devices(madera->dev, PLATFORM_DEVID_NONE,
413 ARRAY_SIZE(madera_ldo1_devs),
416 dev_err(dev, "Failed to add LDO1 child: %d\n", ret);
421 /* No point continuing if the type is unknown */
422 dev_err(madera->dev, "Unknown device type %d\n", madera->type);
426 ret = devm_regulator_bulk_get(dev, madera->num_core_supplies,
427 madera->core_supplies);
429 dev_err(dev, "Failed to request core supplies: %d\n", ret);
434 * Don't use devres here. If the regulator is one of our children it
435 * will already have been removed before devres cleanup on this mfd
436 * driver tries to call put() on it. We need control of shutdown order.
438 madera->dcvdd = regulator_get(madera->dev, "DCVDD");
439 if (IS_ERR(madera->dcvdd)) {
440 ret = PTR_ERR(madera->dcvdd);
441 dev_err(dev, "Failed to request DCVDD: %d\n", ret);
445 ret = regulator_bulk_enable(madera->num_core_supplies,
446 madera->core_supplies);
448 dev_err(dev, "Failed to enable core supplies: %d\n", ret);
452 ret = regulator_enable(madera->dcvdd);
454 dev_err(dev, "Failed to enable DCVDD: %d\n", ret);
458 madera_disable_hard_reset(madera);
460 regcache_cache_only(madera->regmap, false);
461 regcache_cache_only(madera->regmap_32bit, false);
464 * Now we can power up and verify that this is a chip we know about
465 * before we start doing any writes to its registers.
467 ret = regmap_read(madera->regmap, MADERA_SOFTWARE_RESET, &hwid);
469 dev_err(dev, "Failed to read ID register: %d\n", ret);
474 case CS47L35_SILICON_ID:
475 if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
476 switch (madera->type) {
478 patch_fn = cs47l35_patch;
479 mfd_devs = cs47l35_devs;
480 n_devs = ARRAY_SIZE(cs47l35_devs);
487 case CS47L85_SILICON_ID:
488 if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
489 switch (madera->type) {
492 patch_fn = cs47l85_patch;
493 mfd_devs = cs47l85_devs;
494 n_devs = ARRAY_SIZE(cs47l85_devs);
501 case CS47L90_SILICON_ID:
502 if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
503 switch (madera->type) {
506 patch_fn = cs47l90_patch;
507 mfd_devs = cs47l90_devs;
508 n_devs = ARRAY_SIZE(cs47l90_devs);
516 dev_err(madera->dev, "Unknown device ID: %x\n", hwid);
522 dev_err(madera->dev, "Device ID 0x%x not a %s\n", hwid,
529 * It looks like a device we support. If we don't have a hard reset
530 * we can now attempt a soft reset.
532 if (!madera->pdata.reset) {
533 ret = madera_soft_reset(madera);
538 ret = madera_wait_for_boot(madera);
540 dev_err(madera->dev, "Device failed initial boot: %d\n", ret);
544 ret = regmap_read(madera->regmap, MADERA_HARDWARE_REVISION,
547 dev_err(dev, "Failed to read revision register: %d\n", ret);
550 madera->rev &= MADERA_HW_REVISION_MASK;
552 dev_info(dev, "%s silicon revision %d\n", madera->type_name,
555 /* Apply hardware patch */
557 ret = patch_fn(madera);
559 dev_err(madera->dev, "Failed to apply patch %d\n", ret);
564 /* Init 32k clock sourced from MCLK2 */
565 ret = regmap_update_bits(madera->regmap,
567 MADERA_CLK_32K_ENA_MASK | MADERA_CLK_32K_SRC_MASK,
568 MADERA_CLK_32K_ENA | MADERA_32KZ_MCLK2);
570 dev_err(madera->dev, "Failed to init 32k clock: %d\n", ret);
574 pm_runtime_set_active(madera->dev);
575 pm_runtime_enable(madera->dev);
576 pm_runtime_set_autosuspend_delay(madera->dev, 100);
577 pm_runtime_use_autosuspend(madera->dev);
579 /* No devm_ because we need to control shutdown order of children */
580 ret = mfd_add_devices(madera->dev, PLATFORM_DEVID_NONE,
584 dev_err(madera->dev, "Failed to add subdevices: %d\n", ret);
591 pm_runtime_disable(madera->dev);
593 madera_enable_hard_reset(madera);
594 regulator_disable(madera->dcvdd);
596 regulator_bulk_disable(madera->num_core_supplies,
597 madera->core_supplies);
599 regulator_put(madera->dcvdd);
601 mfd_remove_devices(dev);
605 EXPORT_SYMBOL_GPL(madera_dev_init);
607 int madera_dev_exit(struct madera *madera)
609 /* Prevent any IRQs being serviced while we clean up */
610 disable_irq(madera->irq);
613 * DCVDD could be supplied by a child node, we must disable it before
614 * removing the children, and prevent PM runtime from turning it back on
616 pm_runtime_disable(madera->dev);
618 regulator_disable(madera->dcvdd);
619 regulator_put(madera->dcvdd);
621 mfd_remove_devices(madera->dev);
622 madera_enable_hard_reset(madera);
624 regulator_bulk_disable(madera->num_core_supplies,
625 madera->core_supplies);
628 EXPORT_SYMBOL_GPL(madera_dev_exit);
630 MODULE_DESCRIPTION("Madera core MFD driver");
631 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
632 MODULE_LICENSE("GPL v2");