dmaengine: dw: platform: Split ACPI helpers to separate module

For better maintenance split ACPI helpers to the separate module.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190820131546.75744-10-andriy.shevchenko@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dw/Makefile

@@ -3,7 +3,8 @@ obj-$(CONFIG_DW_DMAC_CORE)	+= dw_dmac_core.o
 dw_dmac_core-objs	:= core.o dw.o idma32.o
 
 obj-$(CONFIG_DW_DMAC)		+= dw_dmac.o
-dw_dmac-objs		:= platform.o
+dw_dmac-y			:= platform.o
+dw_dmac-$(CONFIG_ACPI)		+= acpi.o
 
 obj-$(CONFIG_DW_DMAC_PCI)	+= dw_dmac_pci.o
 dw_dmac_pci-objs	:= pci.o

drivers/dma/dw/acpi.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2013,2019 Intel Corporation
+
+#include <linux/acpi.h>
+#include <linux/acpi_dma.h>
+
+#include "internal.h"
+
+static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
+{
+	struct acpi_dma_spec *dma_spec = param;
+	struct dw_dma_slave slave = {
+		.dma_dev = dma_spec->dev,
+		.src_id = dma_spec->slave_id,
+		.dst_id = dma_spec->slave_id,
+		.m_master = 0,
+		.p_master = 1,
+	};
+
+	return dw_dma_filter(chan, &slave);
+}
+
+void dw_dma_acpi_controller_register(struct dw_dma *dw)
+{
+	struct device *dev = dw->dma.dev;
+	struct acpi_dma_filter_info *info;
+	int ret;
+
+	if (!has_acpi_companion(dev))
+		return;
+
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return;
+
+	dma_cap_zero(info->dma_cap);
+	dma_cap_set(DMA_SLAVE, info->dma_cap);
+	info->filter_fn = dw_dma_acpi_filter;
+
+	ret = acpi_dma_controller_register(dev, acpi_dma_simple_xlate, info);
+	if (ret)
+		dev_err(dev, "could not register acpi_dma_controller\n");
+}
+
+void dw_dma_acpi_controller_free(struct dw_dma *dw)
+{
+	struct device *dev = dw->dma.dev;
+
+	if (!has_acpi_companion(dev))
+		return;
+
+	acpi_dma_controller_free(dev);
+}

drivers/dma/dw/internal.h

@@ -23,6 +23,14 @@ int do_dw_dma_enable(struct dw_dma_chip *chip);
 
 extern bool dw_dma_filter(struct dma_chan *chan, void *param);
 
+#ifdef CONFIG_ACPI
+void dw_dma_acpi_controller_register(struct dw_dma *dw);
+void dw_dma_acpi_controller_free(struct dw_dma *dw);
+#else /* !CONFIG_ACPI */
+static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
+static inline void dw_dma_acpi_controller_free(struct dw_dma *dw) {}
+#endif /* !CONFIG_ACPI */
+
 struct dw_dma_chip_pdata {
 	const struct dw_dma_platform_data *pdata;
 	int (*probe)(struct dw_dma_chip *chip);

drivers/dma/dw/platform.c

@@ -19,7 +19,6 @@
 #include <linux/of.h>
 #include <linux/of_dma.h>
 #include <linux/acpi.h>
-#include <linux/acpi_dma.h>
 
 #include "internal.h"
 
@@ -55,57 +54,6 @@ static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
 	return dma_request_channel(cap, dw_dma_filter, &slave);
 }
 
-#ifdef CONFIG_ACPI
-static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
-{
-	struct acpi_dma_spec *dma_spec = param;
-	struct dw_dma_slave slave = {
-		.dma_dev = dma_spec->dev,
-		.src_id = dma_spec->slave_id,
-		.dst_id = dma_spec->slave_id,
-		.m_master = 0,
-		.p_master = 1,
-	};
-
-	return dw_dma_filter(chan, &slave);
-}
-
-static void dw_dma_acpi_controller_register(struct dw_dma *dw)
-{
-	struct device *dev = dw->dma.dev;
-	struct acpi_dma_filter_info *info;
-	int ret;
-
-	if (!has_acpi_companion(dev))
-		return;
-
-	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
-	if (!info)
-		return;
-
-	dma_cap_zero(info->dma_cap);
-	dma_cap_set(DMA_SLAVE, info->dma_cap);
-	info->filter_fn = dw_dma_acpi_filter;
-
-	ret = acpi_dma_controller_register(dev, acpi_dma_simple_xlate, info);
-	if (ret)
-		dev_err(dev, "could not register acpi_dma_controller\n");
-}
-
-static void dw_dma_acpi_controller_free(struct dw_dma *dw)
-{
-	struct device *dev = dw->dma.dev;
-
-	if (!has_acpi_companion(dev))
-		return;
-
-	acpi_dma_controller_free(dev);
-}
-#else /* !CONFIG_ACPI */
-static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
-static inline void dw_dma_acpi_controller_free(struct dw_dma *dw) {}
-#endif /* !CONFIG_ACPI */
-
 #ifdef CONFIG_OF
 static struct dw_dma_platform_data *
 dw_dma_parse_dt(struct platform_device *pdev)