soundwire: intel: move bus common sequences to different file

Now that the bus start/stop/clock_stop sequences use the ops, we can
move them to a different file to reuse them.

Note that we could in theory remove the abstraction for all those
sequences and directly call the functions in intel_auxdevice.c. To
allow for more flexibility and have means to special-case new
platforms, we decided to keep the abstraction. If in time it becomes
clear there is no benefit the abstraction will be simplified.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230314015410.487311-9-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

4 files changed, 219 insertions, 200 deletions

diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
index ca97414ada70..8038e840ac5b 100644
--- a/drivers/soundwire/Makefile
+++ b/drivers/soundwire/Makefile
@@ -20,7 +20,8 @@ soundwire-cadence-y := cadence_master.o
 obj-$(CONFIG_SOUNDWIRE_CADENCE) += soundwire-cadence.o
 
 #Intel driver
-soundwire-intel-y :=	intel.o intel_auxdevice.o intel_init.o dmi-quirks.o
+soundwire-intel-y :=	intel.o intel_auxdevice.o intel_init.o dmi-quirks.o \
+			intel_bus_common.o
 obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel.o
 
 #Qualcomm driver
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 8395a20e5739..77d698908595 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1122,205 +1122,6 @@ static int intel_register_dai(struct sdw_intel *sdw)
 					       dais, num_dai);
 }
 
-static int intel_start_bus(struct sdw_intel *sdw)
-{
-	struct device *dev = sdw->cdns.dev;
-	struct sdw_cdns *cdns = &sdw->cdns;
-	struct sdw_bus *bus = &cdns->bus;
-	int ret;
-
-	ret = sdw_cdns_enable_interrupt(cdns, true);
-	if (ret < 0) {
-		dev_err(dev, "%s: cannot enable interrupts: %d\n", __func__, ret);
-		return ret;
-	}
-
-	/*
-	 * follow recommended programming flows to avoid timeouts when
-	 * gsync is enabled
-	 */
-	if (bus->multi_link)
-		sdw_intel_sync_arm(sdw);
-
-	ret = sdw_cdns_init(cdns);
-	if (ret < 0) {
-		dev_err(dev, "%s: unable to initialize Cadence IP: %d\n", __func__, ret);
-		goto err_interrupt;
-	}
-
-	ret = sdw_cdns_exit_reset(cdns);
-	if (ret < 0) {
-		dev_err(dev, "%s: unable to exit bus reset sequence: %d\n", __func__, ret);
-		goto err_interrupt;
-	}
-
-	if (bus->multi_link) {
-		ret = sdw_intel_sync_go(sdw);
-		if (ret < 0) {
-			dev_err(dev, "%s: sync go failed: %d\n", __func__, ret);
-			goto err_interrupt;
-		}
-	}
-	sdw_cdns_check_self_clearing_bits(cdns, __func__,
-					  true, INTEL_MASTER_RESET_ITERATIONS);
-
-	return 0;
-
-err_interrupt:
-	sdw_cdns_enable_interrupt(cdns, false);
-	return ret;
-}
-
-static int intel_start_bus_after_reset(struct sdw_intel *sdw)
-{
-	struct device *dev = sdw->cdns.dev;
-	struct sdw_cdns *cdns = &sdw->cdns;
-	struct sdw_bus *bus = &cdns->bus;
-	bool clock_stop0;
-	int status;
-	int ret;
-
-	/*
-	 * An exception condition occurs for the CLK_STOP_BUS_RESET
-	 * case if one or more masters remain active. In this condition,
-	 * all the masters are powered on for they are in the same power
-	 * domain. Master can preserve its context for clock stop0, so
-	 * there is no need to clear slave status and reset bus.
-	 */
-	clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
-
-	if (!clock_stop0) {
-
-		/*
-		 * make sure all Slaves are tagged as UNATTACHED and
-		 * provide reason for reinitialization
-		 */
-
-		status = SDW_UNATTACH_REQUEST_MASTER_RESET;
-		sdw_clear_slave_status(bus, status);
-
-		ret = sdw_cdns_enable_interrupt(cdns, true);
-		if (ret < 0) {
-			dev_err(dev, "cannot enable interrupts during resume\n");
-			return ret;
-		}
-
-		/*
-		 * follow recommended programming flows to avoid
-		 * timeouts when gsync is enabled
-		 */
-		if (bus->multi_link)
-			sdw_intel_sync_arm(sdw);
-
-		/*
-		 * Re-initialize the IP since it was powered-off
-		 */
-		sdw_cdns_init(&sdw->cdns);
-
-	} else {
-		ret = sdw_cdns_enable_interrupt(cdns, true);
-		if (ret < 0) {
-			dev_err(dev, "cannot enable interrupts during resume\n");
-			return ret;
-		}
-	}
-
-	ret = sdw_cdns_clock_restart(cdns, !clock_stop0);
-	if (ret < 0) {
-		dev_err(dev, "unable to restart clock during resume\n");
-		goto err_interrupt;
-	}
-
-	if (!clock_stop0) {
-		ret = sdw_cdns_exit_reset(cdns);
-		if (ret < 0) {
-			dev_err(dev, "unable to exit bus reset sequence during resume\n");
-			goto err_interrupt;
-		}
-
-		if (bus->multi_link) {
-			ret = sdw_intel_sync_go(sdw);
-			if (ret < 0) {
-				dev_err(sdw->cdns.dev, "sync go failed during resume\n");
-				goto err_interrupt;
-			}
-		}
-	}
-	sdw_cdns_check_self_clearing_bits(cdns, __func__, true, INTEL_MASTER_RESET_ITERATIONS);
-
-	return 0;
-
-err_interrupt:
-	sdw_cdns_enable_interrupt(cdns, false);
-	return ret;
-}
-
-static void intel_check_clock_stop(struct sdw_intel *sdw)
-{
-	struct device *dev = sdw->cdns.dev;
-	bool clock_stop0;
-
-	clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
-	if (!clock_stop0)
-		dev_err(dev, "%s: invalid configuration, clock was not stopped\n", __func__);
-}
-
-static int intel_start_bus_after_clock_stop(struct sdw_intel *sdw)
-{
-	struct device *dev = sdw->cdns.dev;
-	struct sdw_cdns *cdns = &sdw->cdns;
-	int ret;
-
-	ret = sdw_cdns_enable_interrupt(cdns, true);
-	if (ret < 0) {
-		dev_err(dev, "%s: cannot enable interrupts: %d\n", __func__, ret);
-		return ret;
-	}
-
-	ret = sdw_cdns_clock_restart(cdns, false);
-	if (ret < 0) {
-		dev_err(dev, "%s: unable to restart clock: %d\n", __func__, ret);
-		sdw_cdns_enable_interrupt(cdns, false);
-		return ret;
-	}
-
-	sdw_cdns_check_self_clearing_bits(cdns, "intel_resume_runtime no_quirks",
-					  true, INTEL_MASTER_RESET_ITERATIONS);
-
-	return 0;
-}
-
-static int intel_stop_bus(struct sdw_intel *sdw, bool clock_stop)
-{
-	struct device *dev = sdw->cdns.dev;
-	struct sdw_cdns *cdns = &sdw->cdns;
-	bool wake_enable = false;
-	int ret;
-
-	if (clock_stop) {
-		ret = sdw_cdns_clock_stop(cdns, true);
-		if (ret < 0)
-			dev_err(dev, "%s: cannot stop clock: %d\n", __func__, ret);
-		else
-			wake_enable = true;
-	}
-
-	ret = sdw_cdns_enable_interrupt(cdns, false);
-	if (ret < 0) {
-		dev_err(dev, "%s: cannot disable interrupts: %d\n", __func__, ret);
-		return ret;
-	}
-
-	ret = sdw_intel_link_power_down(sdw);
-	if (ret) {
-		dev_err(dev, "%s: Link power down failed: %d\n", __func__, ret);
-		return ret;
-	}
-
-	sdw_intel_shim_wake(sdw, wake_enable);
-
-	return 0;
-}
 
 const struct sdw_intel_hw_ops sdw_intel_cnl_hw_ops = {
 	.debugfs_init = intel_debugfs_init,
diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index 28b21a92e28b..abd1a500defa 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -187,4 +187,11 @@ static inline int sdw_intel_sync_go(struct sdw_intel *sdw)
 	return -ENOTSUPP;
 }
 
+/* common bus management */
+int intel_start_bus(struct sdw_intel *sdw);
+int intel_start_bus_after_reset(struct sdw_intel *sdw);
+void intel_check_clock_stop(struct sdw_intel *sdw);
+int intel_start_bus_after_clock_stop(struct sdw_intel *sdw);
+int intel_stop_bus(struct sdw_intel *sdw, bool clock_stop);
+
 #endif /* __SDW_INTEL_LOCAL_H */
diff --git a/drivers/soundwire/intel_bus_common.c b/drivers/soundwire/intel_bus_common.c
new file mode 100644
index 000000000000..9a06ab58018b
--- /dev/null
+++ b/drivers/soundwire/intel_bus_common.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+// Copyright(c) 2015-2023 Intel Corporation. All rights reserved.
+
+#include <linux/acpi.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_intel.h>
+#include "cadence_master.h"
+#include "bus.h"
+#include "intel.h"
+
+int intel_start_bus(struct sdw_intel *sdw)
+{
+	struct device *dev = sdw->cdns.dev;
+	struct sdw_cdns *cdns = &sdw->cdns;
+	struct sdw_bus *bus = &cdns->bus;
+	int ret;
+
+	ret = sdw_cdns_enable_interrupt(cdns, true);
+	if (ret < 0) {
+		dev_err(dev, "%s: cannot enable interrupts: %d\n", __func__, ret);
+		return ret;
+	}
+
+	/*
+	 * follow recommended programming flows to avoid timeouts when
+	 * gsync is enabled
+	 */
+	if (bus->multi_link)
+		sdw_intel_sync_arm(sdw);
+
+	ret = sdw_cdns_init(cdns);
+	if (ret < 0) {
+		dev_err(dev, "%s: unable to initialize Cadence IP: %d\n", __func__, ret);
+		goto err_interrupt;
+	}
+
+	ret = sdw_cdns_exit_reset(cdns);
+	if (ret < 0) {
+		dev_err(dev, "%s: unable to exit bus reset sequence: %d\n", __func__, ret);
+		goto err_interrupt;
+	}
+
+	if (bus->multi_link) {
+		ret = sdw_intel_sync_go(sdw);
+		if (ret < 0) {
+			dev_err(dev, "%s: sync go failed: %d\n", __func__, ret);
+			goto err_interrupt;
+		}
+	}
+	sdw_cdns_check_self_clearing_bits(cdns, __func__,
+					  true, INTEL_MASTER_RESET_ITERATIONS);
+
+	return 0;
+
+err_interrupt:
+	sdw_cdns_enable_interrupt(cdns, false);
+	return ret;
+}
+
+int intel_start_bus_after_reset(struct sdw_intel *sdw)
+{
+	struct device *dev = sdw->cdns.dev;
+	struct sdw_cdns *cdns = &sdw->cdns;
+	struct sdw_bus *bus = &cdns->bus;
+	bool clock_stop0;
+	int status;
+	int ret;
+
+	/*
+	 * An exception condition occurs for the CLK_STOP_BUS_RESET
+	 * case if one or more masters remain active. In this condition,
+	 * all the masters are powered on for they are in the same power
+	 * domain. Master can preserve its context for clock stop0, so
+	 * there is no need to clear slave status and reset bus.
+	 */
+	clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
+
+	if (!clock_stop0) {
+
+		/*
+		 * make sure all Slaves are tagged as UNATTACHED and
+		 * provide reason for reinitialization
+		 */
+
+		status = SDW_UNATTACH_REQUEST_MASTER_RESET;
+		sdw_clear_slave_status(bus, status);
+
+		ret = sdw_cdns_enable_interrupt(cdns, true);
+		if (ret < 0) {
+			dev_err(dev, "cannot enable interrupts during resume\n");
+			return ret;
+		}
+
+		/*
+		 * follow recommended programming flows to avoid
+		 * timeouts when gsync is enabled
+		 */
+		if (bus->multi_link)
+			sdw_intel_sync_arm(sdw);
+
+		/*
+		 * Re-initialize the IP since it was powered-off
+		 */
+		sdw_cdns_init(&sdw->cdns);
+
+	} else {
+		ret = sdw_cdns_enable_interrupt(cdns, true);
+		if (ret < 0) {
+			dev_err(dev, "cannot enable interrupts during resume\n");
+			return ret;
+		}
+	}
+
+	ret = sdw_cdns_clock_restart(cdns, !clock_stop0);
+	if (ret < 0) {
+		dev_err(dev, "unable to restart clock during resume\n");
+		goto err_interrupt;
+	}
+
+	if (!clock_stop0) {
+		ret = sdw_cdns_exit_reset(cdns);
+		if (ret < 0) {
+			dev_err(dev, "unable to exit bus reset sequence during resume\n");
+			goto err_interrupt;
+		}
+
+		if (bus->multi_link) {
+			ret = sdw_intel_sync_go(sdw);
+			if (ret < 0) {
+				dev_err(sdw->cdns.dev, "sync go failed during resume\n");
+				goto err_interrupt;
+			}
+		}
+	}
+	sdw_cdns_check_self_clearing_bits(cdns, __func__, true, INTEL_MASTER_RESET_ITERATIONS);
+
+	return 0;
+
+err_interrupt:
+	sdw_cdns_enable_interrupt(cdns, false);
+	return ret;
+}
+
+void intel_check_clock_stop(struct sdw_intel *sdw)
+{
+	struct device *dev = sdw->cdns.dev;
+	bool clock_stop0;
+
+	clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
+	if (!clock_stop0)
+		dev_err(dev, "%s: invalid configuration, clock was not stopped\n", __func__);
+}
+
+int intel_start_bus_after_clock_stop(struct sdw_intel *sdw)
+{
+	struct device *dev = sdw->cdns.dev;
+	struct sdw_cdns *cdns = &sdw->cdns;
+	int ret;
+
+	ret = sdw_cdns_enable_interrupt(cdns, true);
+	if (ret < 0) {
+		dev_err(dev, "%s: cannot enable interrupts: %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = sdw_cdns_clock_restart(cdns, false);
+	if (ret < 0) {
+		dev_err(dev, "%s: unable to restart clock: %d\n", __func__, ret);
+		sdw_cdns_enable_interrupt(cdns, false);
+		return ret;
+	}
+
+	sdw_cdns_check_self_clearing_bits(cdns, "intel_resume_runtime no_quirks",
+					  true, INTEL_MASTER_RESET_ITERATIONS);
+
+	return 0;
+}
+
+int intel_stop_bus(struct sdw_intel *sdw, bool clock_stop)
+{
+	struct device *dev = sdw->cdns.dev;
+	struct sdw_cdns *cdns = &sdw->cdns;
+	bool wake_enable = false;
+	int ret;
+
+	if (clock_stop) {
+		ret = sdw_cdns_clock_stop(cdns, true);
+		if (ret < 0)
+			dev_err(dev, "%s: cannot stop clock: %d\n", __func__, ret);
+		else
+			wake_enable = true;
+	}
+
+	ret = sdw_cdns_enable_interrupt(cdns, false);
+	if (ret < 0) {
+		dev_err(dev, "%s: cannot disable interrupts: %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = sdw_intel_link_power_down(sdw);
+	if (ret) {
+		dev_err(dev, "%s: Link power down failed: %d\n", __func__, ret);
+		return ret;
+	}
+
+	sdw_intel_shim_wake(sdw, wake_enable);
+
+	return 0;
+}