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-rw-r--r--sound/soc/codecs/cs35l56-sdw.c566
1 files changed, 566 insertions, 0 deletions
diff --git a/sound/soc/codecs/cs35l56-sdw.c b/sound/soc/codecs/cs35l56-sdw.c
new file mode 100644
index 000000000000..2cde78605ba9
--- /dev/null
+++ b/sound/soc/codecs/cs35l56-sdw.c
@@ -0,0 +1,566 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// CS35L56 ALSA SoC audio driver SoundWire binding
+//
+// Copyright (C) 2023 Cirrus Logic, Inc. and
+// Cirrus Logic International Semiconductor Ltd.
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <linux/soundwire/sdw_type.h>
+#include <linux/swab.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "cs35l56.h"
+
+/* Register addresses are offset when sent over SoundWire */
+#define CS35L56_SDW_ADDR_OFFSET 0x8000
+
+static int cs35l56_sdw_read_one(struct sdw_slave *peripheral, unsigned int reg, void *buf)
+{
+ int ret;
+
+ ret = sdw_nread_no_pm(peripheral, reg, 4, (u8 *)buf);
+ if (ret != 0) {
+ dev_err(&peripheral->dev, "Read failed @%#x:%d\n", reg, ret);
+ return ret;
+ }
+
+ swab32s((u32 *)buf);
+
+ return 0;
+}
+
+static int cs35l56_sdw_read(void *context, const void *reg_buf,
+ const size_t reg_size, void *val_buf,
+ size_t val_size)
+{
+ struct sdw_slave *peripheral = context;
+ u8 *buf8 = val_buf;
+ unsigned int reg, bytes;
+ int ret;
+
+ reg = le32_to_cpu(*(const __le32 *)reg_buf);
+ reg += CS35L56_SDW_ADDR_OFFSET;
+
+ if (val_size == 4)
+ return cs35l56_sdw_read_one(peripheral, reg, val_buf);
+
+ while (val_size) {
+ bytes = SDW_REG_NO_PAGE - (reg & SDW_REGADDR); /* to end of page */
+ if (bytes > val_size)
+ bytes = val_size;
+
+ ret = sdw_nread_no_pm(peripheral, reg, bytes, buf8);
+ if (ret != 0) {
+ dev_err(&peripheral->dev, "Read failed @%#x..%#x:%d\n",
+ reg, reg + bytes - 1, ret);
+ return ret;
+ }
+
+ swab32_array((u32 *)buf8, bytes / 4);
+ val_size -= bytes;
+ reg += bytes;
+ buf8 += bytes;
+ }
+
+ return 0;
+}
+
+static inline void cs35l56_swab_copy(void *dest, const void *src, size_t nbytes)
+{
+ u32 *dest32 = dest;
+ const u32 *src32 = src;
+
+ for (; nbytes > 0; nbytes -= 4)
+ *dest32++ = swab32(*src32++);
+}
+
+static int cs35l56_sdw_write_one(struct sdw_slave *peripheral, unsigned int reg, const void *buf)
+{
+ u32 val_le = swab32(*(u32 *)buf);
+ int ret;
+
+ ret = sdw_nwrite_no_pm(peripheral, reg, 4, (u8 *)&val_le);
+ if (ret != 0) {
+ dev_err(&peripheral->dev, "Write failed @%#x:%d\n", reg, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cs35l56_sdw_gather_write(void *context,
+ const void *reg_buf, size_t reg_size,
+ const void *val_buf, size_t val_size)
+{
+ struct sdw_slave *peripheral = context;
+ const u8 *src_be = val_buf;
+ u32 val_le_buf[64]; /* Define u32 so it is 32-bit aligned */
+ unsigned int reg, bytes;
+ int ret;
+
+ reg = le32_to_cpu(*(const __le32 *)reg_buf);
+ reg += CS35L56_SDW_ADDR_OFFSET;
+
+ if (val_size == 4)
+ return cs35l56_sdw_write_one(peripheral, reg, src_be);
+
+ while (val_size) {
+ bytes = SDW_REG_NO_PAGE - (reg & SDW_REGADDR); /* to end of page */
+ if (bytes > val_size)
+ bytes = val_size;
+ if (bytes > sizeof(val_le_buf))
+ bytes = sizeof(val_le_buf);
+
+ cs35l56_swab_copy(val_le_buf, src_be, bytes);
+
+ ret = sdw_nwrite_no_pm(peripheral, reg, bytes, (u8 *)val_le_buf);
+ if (ret != 0) {
+ dev_err(&peripheral->dev, "Write failed @%#x..%#x:%d\n",
+ reg, reg + bytes - 1, ret);
+ return ret;
+ }
+
+ val_size -= bytes;
+ reg += bytes;
+ src_be += bytes;
+ }
+
+ return 0;
+}
+
+static int cs35l56_sdw_write(void *context, const void *val_buf, size_t val_size)
+{
+ const u8 *src_buf = val_buf;
+
+ /* First word of val_buf contains the destination address */
+ return cs35l56_sdw_gather_write(context, &src_buf[0], 4, &src_buf[4], val_size - 4);
+}
+
+/*
+ * Registers are big-endian on I2C and SPI but little-endian on SoundWire.
+ * Exported firmware controls are big-endian on I2C/SPI but little-endian on
+ * SoundWire. Firmware files are always big-endian and are opaque blobs.
+ * Present a big-endian regmap and hide the endianness swap, so that the ALSA
+ * byte controls always have the same byte order, and firmware file blobs
+ * can be written verbatim.
+ */
+static const struct regmap_bus cs35l56_regmap_bus_sdw = {
+ .read = cs35l56_sdw_read,
+ .write = cs35l56_sdw_write,
+ .gather_write = cs35l56_sdw_gather_write,
+ .reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
+ .val_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+static void cs35l56_sdw_init(struct sdw_slave *peripheral)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
+ int ret;
+
+ pm_runtime_get_noresume(cs35l56->dev);
+
+ regcache_cache_only(cs35l56->regmap, false);
+
+ ret = cs35l56_init(cs35l56);
+ if (ret < 0) {
+ regcache_cache_only(cs35l56->regmap, true);
+ goto out;
+ }
+
+ /*
+ * cs35l56_init can return with !init_done if it triggered
+ * a soft reset.
+ */
+ if (cs35l56->init_done) {
+ /* Enable SoundWire interrupts */
+ sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1,
+ CS35L56_SDW_INT_MASK_CODEC_IRQ);
+ }
+
+out:
+ pm_runtime_mark_last_busy(cs35l56->dev);
+ pm_runtime_put_autosuspend(cs35l56->dev);
+}
+
+static int cs35l56_sdw_interrupt(struct sdw_slave *peripheral,
+ struct sdw_slave_intr_status *status)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
+
+ /* SoundWire core holds our pm_runtime when calling this function. */
+
+ dev_dbg(cs35l56->dev, "int control_port=%#x\n", status->control_port);
+
+ if ((status->control_port & SDW_SCP_INT1_IMPL_DEF) == 0)
+ return 0;
+
+ /*
+ * Prevent bus manager suspending and possibly issuing a
+ * bus-reset before the queued work has run.
+ */
+ pm_runtime_get_noresume(cs35l56->dev);
+
+ /*
+ * Mask and clear until it has been handled. The read of GEN_INT_STAT_1
+ * is required as per the SoundWire spec for interrupt status bits
+ * to clear. GEN_INT_MASK_1 masks the _inputs_ to GEN_INT_STAT1.
+ * None of the interrupts are time-critical so use the
+ * power-efficient queue.
+ */
+ sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);
+ sdw_read_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1);
+ sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);
+ queue_work(system_power_efficient_wq, &cs35l56->sdw_irq_work);
+
+ return 0;
+}
+
+static void cs35l56_sdw_irq_work(struct work_struct *work)
+{
+ struct cs35l56_private *cs35l56 = container_of(work,
+ struct cs35l56_private,
+ sdw_irq_work);
+
+ cs35l56_irq(-1, cs35l56);
+
+ /* unmask interrupts */
+ if (!cs35l56->sdw_irq_no_unmask)
+ sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1,
+ CS35L56_SDW_INT_MASK_CODEC_IRQ);
+
+ pm_runtime_put_autosuspend(cs35l56->dev);
+}
+
+static int cs35l56_sdw_read_prop(struct sdw_slave *peripheral)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
+ struct sdw_slave_prop *prop = &peripheral->prop;
+ struct sdw_dpn_prop *ports;
+
+ ports = devm_kcalloc(cs35l56->dev, 2, sizeof(*ports), GFP_KERNEL);
+ if (!ports)
+ return -ENOMEM;
+
+ prop->source_ports = BIT(CS35L56_SDW1_CAPTURE_PORT);
+ prop->sink_ports = BIT(CS35L56_SDW1_PLAYBACK_PORT);
+ prop->paging_support = true;
+ prop->clk_stop_mode1 = false;
+ prop->quirks = SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY;
+ prop->scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY | SDW_SCP_INT1_IMPL_DEF;
+
+ /* DP1 - playback */
+ ports[0].num = CS35L56_SDW1_PLAYBACK_PORT;
+ ports[0].type = SDW_DPN_FULL;
+ ports[0].ch_prep_timeout = 10;
+ prop->sink_dpn_prop = &ports[0];
+
+ /* DP3 - capture */
+ ports[1].num = CS35L56_SDW1_CAPTURE_PORT;
+ ports[1].type = SDW_DPN_FULL;
+ ports[1].ch_prep_timeout = 10;
+ prop->src_dpn_prop = &ports[1];
+
+ return 0;
+}
+
+static int cs35l56_sdw_update_status(struct sdw_slave *peripheral,
+ enum sdw_slave_status status)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
+
+ switch (status) {
+ case SDW_SLAVE_ATTACHED:
+ dev_dbg(cs35l56->dev, "%s: ATTACHED\n", __func__);
+ if (cs35l56->sdw_attached)
+ break;
+
+ if (!cs35l56->init_done || cs35l56->soft_resetting)
+ cs35l56_sdw_init(peripheral);
+
+ cs35l56->sdw_attached = true;
+ break;
+ case SDW_SLAVE_UNATTACHED:
+ dev_dbg(cs35l56->dev, "%s: UNATTACHED\n", __func__);
+ cs35l56->sdw_attached = false;
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int cs35l56_a1_kick_divider(struct cs35l56_private *cs35l56,
+ struct sdw_slave *peripheral)
+{
+ unsigned int curr_scale_reg, next_scale_reg;
+ int curr_scale, next_scale, ret;
+
+ if (!cs35l56->init_done)
+ return 0;
+
+ if (peripheral->bus->params.curr_bank) {
+ curr_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B1;
+ next_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B0;
+ } else {
+ curr_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B0;
+ next_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B1;
+ }
+
+ /*
+ * Current clock scale value must be different to new value.
+ * Modify current to guarantee this. If next still has the dummy
+ * value we wrote when it was current, the core code has not set
+ * a new scale so restore its original good value
+ */
+ curr_scale = sdw_read_no_pm(peripheral, curr_scale_reg);
+ if (curr_scale < 0) {
+ dev_err(cs35l56->dev, "Failed to read current clock scale: %d\n", curr_scale);
+ return curr_scale;
+ }
+
+ next_scale = sdw_read_no_pm(peripheral, next_scale_reg);
+ if (next_scale < 0) {
+ dev_err(cs35l56->dev, "Failed to read next clock scale: %d\n", next_scale);
+ return next_scale;
+ }
+
+ if (next_scale == CS35L56_SDW_INVALID_BUS_SCALE) {
+ next_scale = cs35l56->old_sdw_clock_scale;
+ ret = sdw_write_no_pm(peripheral, next_scale_reg, next_scale);
+ if (ret < 0) {
+ dev_err(cs35l56->dev, "Failed to modify current clock scale: %d\n", ret);
+ return ret;
+ }
+ }
+
+ cs35l56->old_sdw_clock_scale = curr_scale;
+ ret = sdw_write_no_pm(peripheral, curr_scale_reg, CS35L56_SDW_INVALID_BUS_SCALE);
+ if (ret < 0) {
+ dev_err(cs35l56->dev, "Failed to modify current clock scale: %d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(cs35l56->dev, "Next bus scale: %#x\n", next_scale);
+
+ return 0;
+}
+
+static int cs35l56_sdw_bus_config(struct sdw_slave *peripheral,
+ struct sdw_bus_params *params)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
+ int sclk;
+
+ sclk = params->curr_dr_freq / 2;
+ dev_dbg(cs35l56->dev, "%s: sclk=%u c=%u r=%u\n", __func__, sclk, params->col, params->row);
+
+ if (cs35l56->rev < 0xb0)
+ return cs35l56_a1_kick_divider(cs35l56, peripheral);
+
+ return 0;
+}
+
+static int __maybe_unused cs35l56_sdw_clk_stop(struct sdw_slave *peripheral,
+ enum sdw_clk_stop_mode mode,
+ enum sdw_clk_stop_type type)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
+
+ dev_dbg(cs35l56->dev, "%s: mode:%d type:%d\n", __func__, mode, type);
+
+ return 0;
+}
+
+static const struct sdw_slave_ops cs35l56_sdw_ops = {
+ .read_prop = cs35l56_sdw_read_prop,
+ .interrupt_callback = cs35l56_sdw_interrupt,
+ .update_status = cs35l56_sdw_update_status,
+ .bus_config = cs35l56_sdw_bus_config,
+#ifdef DEBUG
+ .clk_stop = cs35l56_sdw_clk_stop,
+#endif
+};
+
+static int __maybe_unused cs35l56_sdw_handle_unattach(struct cs35l56_private *cs35l56)
+{
+ struct sdw_slave *peripheral = cs35l56->sdw_peripheral;
+
+ if (peripheral->unattach_request) {
+ /* Cannot access registers until bus is re-initialized. */
+ dev_dbg(cs35l56->dev, "Wait for initialization_complete\n");
+ if (!wait_for_completion_timeout(&peripheral->initialization_complete,
+ msecs_to_jiffies(5000))) {
+ dev_err(cs35l56->dev, "initialization_complete timed out\n");
+ return -ETIMEDOUT;
+ }
+
+ peripheral->unattach_request = 0;
+
+ /*
+ * Don't call regcache_mark_dirty(), we can't be sure that the
+ * Manager really did issue a Bus Reset.
+ */
+ }
+
+ return 0;
+}
+
+static int __maybe_unused cs35l56_sdw_runtime_suspend(struct device *dev)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
+
+ if (!cs35l56->init_done)
+ return 0;
+
+ return cs35l56_runtime_suspend(dev);
+}
+
+static int __maybe_unused cs35l56_sdw_runtime_resume(struct device *dev)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
+ int ret;
+
+ dev_dbg(dev, "Runtime resume\n");
+
+ if (!cs35l56->init_done)
+ return 0;
+
+ ret = cs35l56_sdw_handle_unattach(cs35l56);
+ if (ret < 0)
+ return ret;
+
+ ret = cs35l56_runtime_resume_common(cs35l56);
+ if (ret)
+ return ret;
+
+ /* Re-enable SoundWire interrupts */
+ sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1,
+ CS35L56_SDW_INT_MASK_CODEC_IRQ);
+
+ return 0;
+}
+
+static int __maybe_unused cs35l56_sdw_system_suspend(struct device *dev)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
+
+ if (!cs35l56->init_done)
+ return 0;
+
+ /*
+ * Disable SoundWire interrupts.
+ * Flush - don't cancel because that could leave an unbalanced pm_runtime_get.
+ */
+ cs35l56->sdw_irq_no_unmask = true;
+ flush_work(&cs35l56->sdw_irq_work);
+
+ /* Mask interrupts and flush in case sdw_irq_work was queued again */
+ sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);
+ sdw_read_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1);
+ sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);
+ flush_work(&cs35l56->sdw_irq_work);
+
+ return cs35l56_system_suspend(dev);
+}
+
+static int __maybe_unused cs35l56_sdw_system_resume(struct device *dev)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
+
+ cs35l56->sdw_irq_no_unmask = false;
+ /* runtime_resume re-enables the interrupt */
+
+ return cs35l56_system_resume(dev);
+}
+
+static int cs35l56_sdw_probe(struct sdw_slave *peripheral, const struct sdw_device_id *id)
+{
+ struct device *dev = &peripheral->dev;
+ struct cs35l56_private *cs35l56;
+ int ret;
+
+ cs35l56 = devm_kzalloc(dev, sizeof(*cs35l56), GFP_KERNEL);
+ if (!cs35l56)
+ return -ENOMEM;
+
+ cs35l56->dev = dev;
+ cs35l56->sdw_peripheral = peripheral;
+ INIT_WORK(&cs35l56->sdw_irq_work, cs35l56_sdw_irq_work);
+
+ dev_set_drvdata(dev, cs35l56);
+
+ cs35l56->regmap = devm_regmap_init(dev, &cs35l56_regmap_bus_sdw,
+ peripheral, &cs35l56_regmap_sdw);
+ if (IS_ERR(cs35l56->regmap)) {
+ ret = PTR_ERR(cs35l56->regmap);
+ return dev_err_probe(dev, ret, "Failed to allocate register map\n");
+ }
+
+ /* Start in cache-only until device is enumerated */
+ regcache_cache_only(cs35l56->regmap, true);
+
+ ret = cs35l56_common_probe(cs35l56);
+ if (ret != 0)
+ return ret;
+
+ return 0;
+}
+
+static int cs35l56_sdw_remove(struct sdw_slave *peripheral)
+{
+ struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
+
+ /* Disable SoundWire interrupts */
+ cs35l56->sdw_irq_no_unmask = true;
+ cancel_work_sync(&cs35l56->sdw_irq_work);
+ sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);
+ sdw_read_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1);
+ sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);
+
+ cs35l56_remove(cs35l56);
+
+ return 0;
+}
+
+static const struct dev_pm_ops cs35l56_sdw_pm = {
+ SET_RUNTIME_PM_OPS(cs35l56_sdw_runtime_suspend, cs35l56_sdw_runtime_resume, NULL)
+ SYSTEM_SLEEP_PM_OPS(cs35l56_sdw_system_suspend, cs35l56_sdw_system_resume)
+ LATE_SYSTEM_SLEEP_PM_OPS(cs35l56_system_suspend_late, cs35l56_system_resume_early)
+ /* NOIRQ stage not needed, SoundWire doesn't use a hard IRQ */
+};
+
+static const struct sdw_device_id cs35l56_sdw_id[] = {
+ SDW_SLAVE_ENTRY(0x01FA, 0x3556, 0),
+ {},
+};
+MODULE_DEVICE_TABLE(sdw, cs35l56_sdw_id);
+
+static struct sdw_driver cs35l56_sdw_driver = {
+ .driver = {
+ .name = "cs35l56",
+ .pm = &cs35l56_sdw_pm,
+ },
+ .probe = cs35l56_sdw_probe,
+ .remove = cs35l56_sdw_remove,
+ .ops = &cs35l56_sdw_ops,
+ .id_table = cs35l56_sdw_id,
+};
+
+module_sdw_driver(cs35l56_sdw_driver);
+
+MODULE_DESCRIPTION("ASoC CS35L56 SoundWire driver");
+MODULE_IMPORT_NS(SND_SOC_CS35L56_CORE);
+MODULE_IMPORT_NS(SND_SOC_CS35L56_SHARED);
+MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
+MODULE_AUTHOR("Simon Trimmer <simont@opensource.cirrus.com>");
+MODULE_LICENSE("GPL");