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1// SPDX-License-Identifier: GPL-2.0-only2//3// CS35L56 ALSA SoC audio driver SoundWire binding4//5// Copyright (C) 2023 Cirrus Logic, Inc. and6//                    Cirrus Logic International Semiconductor Ltd.7 8#include <linux/delay.h>9#include <linux/device.h>10#include <linux/err.h>11#include <linux/module.h>12#include <linux/pm_runtime.h>13#include <linux/regmap.h>14#include <linux/soundwire/sdw.h>15#include <linux/soundwire/sdw_registers.h>16#include <linux/soundwire/sdw_type.h>17#include <linux/swab.h>18#include <linux/types.h>19#include <linux/workqueue.h>20 21#include "cs35l56.h"22 23/* Register addresses are offset when sent over SoundWire */24#define CS35L56_SDW_ADDR_OFFSET		0x800025 26/* Cirrus bus bridge registers */27#define CS35L56_SDW_MEM_ACCESS_STATUS	0xd028#define CS35L56_SDW_MEM_READ_DATA	0xd829 30#define CS35L56_SDW_LAST_LATE		BIT(3)31#define CS35L56_SDW_CMD_IN_PROGRESS	BIT(2)32#define CS35L56_SDW_RDATA_RDY		BIT(0)33 34#define CS35L56_LATE_READ_POLL_US	1035#define CS35L56_LATE_READ_TIMEOUT_US	100036 37static int cs35l56_sdw_poll_mem_status(struct sdw_slave *peripheral,38				       unsigned int mask,39				       unsigned int match)40{41	int ret, val;42 43	ret = read_poll_timeout(sdw_read_no_pm, val,44				(val < 0) || ((val & mask) == match),45				CS35L56_LATE_READ_POLL_US, CS35L56_LATE_READ_TIMEOUT_US,46				false, peripheral, CS35L56_SDW_MEM_ACCESS_STATUS);47	if (ret < 0)48		return ret;49 50	if (val < 0)51		return val;52 53	return 0;54}55 56static int cs35l56_sdw_slow_read(struct sdw_slave *peripheral, unsigned int reg,57				 u8 *buf, size_t val_size)58{59	int ret, i;60 61	reg += CS35L56_SDW_ADDR_OFFSET;62 63	for (i = 0; i < val_size; i += sizeof(u32)) {64		/* Poll for bus bridge idle */65		ret = cs35l56_sdw_poll_mem_status(peripheral,66						  CS35L56_SDW_CMD_IN_PROGRESS,67						  0);68		if (ret < 0) {69			dev_err(&peripheral->dev, "!CMD_IN_PROGRESS fail: %d\n", ret);70			return ret;71		}72 73		/* Reading LSByte triggers read of register to holding buffer */74		sdw_read_no_pm(peripheral, reg + i);75 76		/* Wait for data available */77		ret = cs35l56_sdw_poll_mem_status(peripheral,78						  CS35L56_SDW_RDATA_RDY,79						  CS35L56_SDW_RDATA_RDY);80		if (ret < 0) {81			dev_err(&peripheral->dev, "RDATA_RDY fail: %d\n", ret);82			return ret;83		}84 85		/* Read data from buffer */86		ret = sdw_nread_no_pm(peripheral, CS35L56_SDW_MEM_READ_DATA,87				      sizeof(u32), &buf[i]);88		if (ret) {89			dev_err(&peripheral->dev, "Late read @%#x failed: %d\n", reg + i, ret);90			return ret;91		}92 93		swab32s((u32 *)&buf[i]);94	}95 96	return 0;97}98 99static int cs35l56_sdw_read_one(struct sdw_slave *peripheral, unsigned int reg, void *buf)100{101	int ret;102 103	ret = sdw_nread_no_pm(peripheral, reg, 4, (u8 *)buf);104	if (ret != 0) {105		dev_err(&peripheral->dev, "Read failed @%#x:%d\n", reg, ret);106		return ret;107	}108 109	swab32s((u32 *)buf);110 111	return 0;112}113 114static int cs35l56_sdw_read(void *context, const void *reg_buf,115			    const size_t reg_size, void *val_buf,116			    size_t val_size)117{118	struct sdw_slave *peripheral = context;119	u8 *buf8 = val_buf;120	unsigned int reg, bytes;121	int ret;122 123	reg = le32_to_cpu(*(const __le32 *)reg_buf);124 125	if (cs35l56_is_otp_register(reg))126		return cs35l56_sdw_slow_read(peripheral, reg, buf8, val_size);127 128	reg += CS35L56_SDW_ADDR_OFFSET;129 130	if (val_size == 4)131		return cs35l56_sdw_read_one(peripheral, reg, val_buf);132 133	while (val_size) {134		bytes = SDW_REG_NO_PAGE - (reg & SDW_REGADDR); /* to end of page */135		if (bytes > val_size)136			bytes = val_size;137 138		ret = sdw_nread_no_pm(peripheral, reg, bytes, buf8);139		if (ret != 0) {140			dev_err(&peripheral->dev, "Read failed @%#x..%#x:%d\n",141				reg, reg + bytes - 1, ret);142			return ret;143		}144 145		swab32_array((u32 *)buf8, bytes / 4);146		val_size -= bytes;147		reg += bytes;148		buf8 += bytes;149	}150 151	return 0;152}153 154static inline void cs35l56_swab_copy(void *dest, const void *src, size_t nbytes)155{156	u32 *dest32 = dest;157	const u32 *src32 = src;158 159	for (; nbytes > 0; nbytes -= 4)160		*dest32++ = swab32(*src32++);161}162 163static int cs35l56_sdw_write_one(struct sdw_slave *peripheral, unsigned int reg, const void *buf)164{165	u32 val_le = swab32(*(u32 *)buf);166	int ret;167 168	ret = sdw_nwrite_no_pm(peripheral, reg, 4, (u8 *)&val_le);169	if (ret != 0) {170		dev_err(&peripheral->dev, "Write failed @%#x:%d\n", reg, ret);171		return ret;172	}173 174	return 0;175}176 177static int cs35l56_sdw_gather_write(void *context,178				    const void *reg_buf, size_t reg_size,179				    const void *val_buf, size_t val_size)180{181	struct sdw_slave *peripheral = context;182	const u8 *src_be = val_buf;183	u32 val_le_buf[64];	/* Define u32 so it is 32-bit aligned */184	unsigned int reg, bytes;185	int ret;186 187	reg = le32_to_cpu(*(const __le32 *)reg_buf);188	reg += CS35L56_SDW_ADDR_OFFSET;189 190	if (val_size == 4)191		return cs35l56_sdw_write_one(peripheral, reg, src_be);192 193	while (val_size) {194		bytes = SDW_REG_NO_PAGE - (reg & SDW_REGADDR); /* to end of page */195		if (bytes > val_size)196			bytes = val_size;197		if (bytes > sizeof(val_le_buf))198			bytes = sizeof(val_le_buf);199 200		cs35l56_swab_copy(val_le_buf, src_be, bytes);201 202		ret = sdw_nwrite_no_pm(peripheral, reg, bytes, (u8 *)val_le_buf);203		if (ret != 0) {204			dev_err(&peripheral->dev, "Write failed @%#x..%#x:%d\n",205				reg, reg + bytes - 1, ret);206			return ret;207		}208 209		val_size -= bytes;210		reg += bytes;211		src_be += bytes;212	}213 214	return 0;215}216 217static int cs35l56_sdw_write(void *context, const void *val_buf, size_t val_size)218{219	const u8 *src_buf = val_buf;220 221	/* First word of val_buf contains the destination address */222	return cs35l56_sdw_gather_write(context, &src_buf[0], 4, &src_buf[4], val_size - 4);223}224 225/*226 * Registers are big-endian on I2C and SPI but little-endian on SoundWire.227 * Exported firmware controls are big-endian on I2C/SPI but little-endian on228 * SoundWire. Firmware files are always big-endian and are opaque blobs.229 * Present a big-endian regmap and hide the endianness swap, so that the ALSA230 * byte controls always have the same byte order, and firmware file blobs231 * can be written verbatim.232 */233static const struct regmap_bus cs35l56_regmap_bus_sdw = {234	.read = cs35l56_sdw_read,235	.write = cs35l56_sdw_write,236	.gather_write = cs35l56_sdw_gather_write,237	.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,238	.val_format_endian_default = REGMAP_ENDIAN_BIG,239};240 241static int cs35l56_sdw_set_cal_index(struct cs35l56_private *cs35l56)242{243	int ret;244 245	/* SoundWire UniqueId is used to index the calibration array */246	ret = sdw_read_no_pm(cs35l56->sdw_peripheral, SDW_SCP_DEVID_0);247	if (ret < 0)248		return ret;249 250	cs35l56->base.cal_index = ret & 0xf;251 252	return 0;253}254 255static void cs35l56_sdw_init(struct sdw_slave *peripheral)256{257	struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);258	int ret;259 260	pm_runtime_get_noresume(cs35l56->base.dev);261 262	if (cs35l56->base.cal_index < 0) {263		ret = cs35l56_sdw_set_cal_index(cs35l56);264		if (ret < 0)265			goto out;266	}267 268	ret = cs35l56_init(cs35l56);269	if (ret < 0) {270		regcache_cache_only(cs35l56->base.regmap, true);271		goto out;272	}273 274	/*275	 * cs35l56_init can return with !init_done if it triggered276	 * a soft reset.277	 */278	if (cs35l56->base.init_done) {279		/* Enable SoundWire interrupts */280		sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1,281				CS35L56_SDW_INT_MASK_CODEC_IRQ);282	}283 284out:285	pm_runtime_mark_last_busy(cs35l56->base.dev);286	pm_runtime_put_autosuspend(cs35l56->base.dev);287}288 289static int cs35l56_sdw_interrupt(struct sdw_slave *peripheral,290				 struct sdw_slave_intr_status *status)291{292	struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);293 294	/* SoundWire core holds our pm_runtime when calling this function. */295 296	dev_dbg(cs35l56->base.dev, "int control_port=%#x\n", status->control_port);297 298	if ((status->control_port & SDW_SCP_INT1_IMPL_DEF) == 0)299		return 0;300 301	/*302	 * Prevent bus manager suspending and possibly issuing a303	 * bus-reset before the queued work has run.304	 */305	pm_runtime_get_noresume(cs35l56->base.dev);306 307	/*308	 * Mask and clear until it has been handled. The read of GEN_INT_STAT_1309	 * is required as per the SoundWire spec for interrupt status bits310	 * to clear. GEN_INT_MASK_1 masks the _inputs_ to GEN_INT_STAT1.311	 * None of the interrupts are time-critical so use the312	 * power-efficient queue.313	 */314	sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);315	sdw_read_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1);316	sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);317	queue_work(system_power_efficient_wq, &cs35l56->sdw_irq_work);318 319	return 0;320}321 322static void cs35l56_sdw_irq_work(struct work_struct *work)323{324	struct cs35l56_private *cs35l56 = container_of(work,325						       struct cs35l56_private,326						       sdw_irq_work);327 328	cs35l56_irq(-1, &cs35l56->base);329 330	/* unmask interrupts */331	if (!cs35l56->sdw_irq_no_unmask)332		sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1,333				CS35L56_SDW_INT_MASK_CODEC_IRQ);334 335	pm_runtime_put_autosuspend(cs35l56->base.dev);336}337 338static int cs35l56_sdw_read_prop(struct sdw_slave *peripheral)339{340	struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);341	struct sdw_slave_prop *prop = &peripheral->prop;342	struct sdw_dpn_prop *ports;343 344	ports = devm_kcalloc(cs35l56->base.dev, 2, sizeof(*ports), GFP_KERNEL);345	if (!ports)346		return -ENOMEM;347 348	prop->source_ports = BIT(CS35L56_SDW1_CAPTURE_PORT);349	prop->sink_ports = BIT(CS35L56_SDW1_PLAYBACK_PORT);350	prop->paging_support = true;351	prop->quirks = SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY;352	prop->scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY | SDW_SCP_INT1_IMPL_DEF;353 354	/* DP1 - playback */355	ports[0].num = CS35L56_SDW1_PLAYBACK_PORT;356	ports[0].type = SDW_DPN_FULL;357	ports[0].ch_prep_timeout = 10;358	prop->sink_dpn_prop = &ports[0];359 360	/* DP3 - capture */361	ports[1].num = CS35L56_SDW1_CAPTURE_PORT;362	ports[1].type = SDW_DPN_FULL;363	ports[1].ch_prep_timeout = 10;364	prop->src_dpn_prop = &ports[1];365 366	return 0;367}368 369static int cs35l56_sdw_update_status(struct sdw_slave *peripheral,370				     enum sdw_slave_status status)371{372	struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);373 374	switch (status) {375	case SDW_SLAVE_ATTACHED:376		dev_dbg(cs35l56->base.dev, "%s: ATTACHED\n", __func__);377		if (cs35l56->sdw_attached)378			break;379 380		if (!cs35l56->base.init_done || cs35l56->soft_resetting)381			cs35l56_sdw_init(peripheral);382 383		cs35l56->sdw_attached = true;384		break;385	case SDW_SLAVE_UNATTACHED:386		dev_dbg(cs35l56->base.dev, "%s: UNATTACHED\n", __func__);387		cs35l56->sdw_attached = false;388		break;389	default:390		break;391	}392 393	return 0;394}395 396static int __maybe_unused cs35l56_sdw_clk_stop(struct sdw_slave *peripheral,397					       enum sdw_clk_stop_mode mode,398					       enum sdw_clk_stop_type type)399{400	struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);401 402	dev_dbg(cs35l56->base.dev, "%s: mode:%d type:%d\n", __func__, mode, type);403 404	return 0;405}406 407static const struct sdw_slave_ops cs35l56_sdw_ops = {408	.read_prop = cs35l56_sdw_read_prop,409	.interrupt_callback = cs35l56_sdw_interrupt,410	.update_status = cs35l56_sdw_update_status,411#ifdef DEBUG412	.clk_stop = cs35l56_sdw_clk_stop,413#endif414};415 416static int __maybe_unused cs35l56_sdw_handle_unattach(struct cs35l56_private *cs35l56)417{418	struct sdw_slave *peripheral = cs35l56->sdw_peripheral;419 420	if (peripheral->unattach_request) {421		/* Cannot access registers until bus is re-initialized. */422		dev_dbg(cs35l56->base.dev, "Wait for initialization_complete\n");423		if (!wait_for_completion_timeout(&peripheral->initialization_complete,424						 msecs_to_jiffies(5000))) {425			dev_err(cs35l56->base.dev, "initialization_complete timed out\n");426			return -ETIMEDOUT;427		}428 429		peripheral->unattach_request = 0;430 431		/*432		 * Don't call regcache_mark_dirty(), we can't be sure that the433		 * Manager really did issue a Bus Reset.434		 */435	}436 437	return 0;438}439 440static int __maybe_unused cs35l56_sdw_runtime_suspend(struct device *dev)441{442	struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);443 444	if (!cs35l56->base.init_done)445		return 0;446 447	return cs35l56_runtime_suspend_common(&cs35l56->base);448}449 450static int __maybe_unused cs35l56_sdw_runtime_resume(struct device *dev)451{452	struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);453	int ret;454 455	dev_dbg(dev, "Runtime resume\n");456 457	if (!cs35l56->base.init_done)458		return 0;459 460	ret = cs35l56_sdw_handle_unattach(cs35l56);461	if (ret < 0)462		return ret;463 464	ret = cs35l56_runtime_resume_common(&cs35l56->base, true);465	if (ret)466		return ret;467 468	/* Re-enable SoundWire interrupts */469	sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1,470			CS35L56_SDW_INT_MASK_CODEC_IRQ);471 472	return 0;473}474 475static int __maybe_unused cs35l56_sdw_system_suspend(struct device *dev)476{477	struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);478 479	if (!cs35l56->base.init_done)480		return 0;481 482	/*483	 * Disable SoundWire interrupts.484	 * Flush - don't cancel because that could leave an unbalanced pm_runtime_get.485	 */486	cs35l56->sdw_irq_no_unmask = true;487	flush_work(&cs35l56->sdw_irq_work);488 489	/* Mask interrupts and flush in case sdw_irq_work was queued again */490	sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);491	sdw_read_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1);492	sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);493	flush_work(&cs35l56->sdw_irq_work);494 495	return cs35l56_system_suspend(dev);496}497 498static int __maybe_unused cs35l56_sdw_system_resume(struct device *dev)499{500	struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);501 502	cs35l56->sdw_irq_no_unmask = false;503	/* runtime_resume re-enables the interrupt */504 505	return cs35l56_system_resume(dev);506}507 508static int cs35l56_sdw_probe(struct sdw_slave *peripheral, const struct sdw_device_id *id)509{510	struct device *dev = &peripheral->dev;511	struct cs35l56_private *cs35l56;512	int ret;513 514	cs35l56 = devm_kzalloc(dev, sizeof(*cs35l56), GFP_KERNEL);515	if (!cs35l56)516		return -ENOMEM;517 518	cs35l56->base.dev = dev;519	cs35l56->sdw_peripheral = peripheral;520	INIT_WORK(&cs35l56->sdw_irq_work, cs35l56_sdw_irq_work);521 522	dev_set_drvdata(dev, cs35l56);523 524	cs35l56->base.regmap = devm_regmap_init(dev, &cs35l56_regmap_bus_sdw,525					   peripheral, &cs35l56_regmap_sdw);526	if (IS_ERR(cs35l56->base.regmap)) {527		ret = PTR_ERR(cs35l56->base.regmap);528		return dev_err_probe(dev, ret, "Failed to allocate register map\n");529	}530 531	/* Start in cache-only until device is enumerated */532	regcache_cache_only(cs35l56->base.regmap, true);533 534	ret = cs35l56_common_probe(cs35l56);535	if (ret != 0)536		return ret;537 538	return 0;539}540 541static int cs35l56_sdw_remove(struct sdw_slave *peripheral)542{543	struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);544 545	/* Disable SoundWire interrupts */546	cs35l56->sdw_irq_no_unmask = true;547	cancel_work_sync(&cs35l56->sdw_irq_work);548	sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);549	sdw_read_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1);550	sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);551 552	cs35l56_remove(cs35l56);553 554	return 0;555}556 557static const struct dev_pm_ops cs35l56_sdw_pm = {558	SET_RUNTIME_PM_OPS(cs35l56_sdw_runtime_suspend, cs35l56_sdw_runtime_resume, NULL)559	SYSTEM_SLEEP_PM_OPS(cs35l56_sdw_system_suspend, cs35l56_sdw_system_resume)560	LATE_SYSTEM_SLEEP_PM_OPS(cs35l56_system_suspend_late, cs35l56_system_resume_early)561	/* NOIRQ stage not needed, SoundWire doesn't use a hard IRQ */562};563 564static const struct sdw_device_id cs35l56_sdw_id[] = {565	SDW_SLAVE_ENTRY(0x01FA, 0x3556, 0),566	SDW_SLAVE_ENTRY(0x01FA, 0x3557, 0),567	{},568};569MODULE_DEVICE_TABLE(sdw, cs35l56_sdw_id);570 571static struct sdw_driver cs35l56_sdw_driver = {572	.driver = {573		.name = "cs35l56",574		.pm = pm_ptr(&cs35l56_sdw_pm),575	},576	.probe = cs35l56_sdw_probe,577	.remove = cs35l56_sdw_remove,578	.ops = &cs35l56_sdw_ops,579	.id_table = cs35l56_sdw_id,580};581 582module_sdw_driver(cs35l56_sdw_driver);583 584MODULE_DESCRIPTION("ASoC CS35L56 SoundWire driver");585MODULE_IMPORT_NS(SND_SOC_CS35L56_CORE);586MODULE_IMPORT_NS(SND_SOC_CS35L56_SHARED);587MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");588MODULE_AUTHOR("Simon Trimmer <simont@opensource.cirrus.com>");589MODULE_LICENSE("GPL");590