ASoC: intel: Fix sst-dsp dependency on dw stuff

The recent commit [a92ea59b74e2: ASoC: Intel: sst: only select
sst-firmware when DW DMAC is built-in] introduced more strict kconfig
dependency (depends on DW_DMAC_CORE=y) for avoiding the build failures
due to dependency messes in intel-sst.  This makes, however, it
impossible to use this driver with the modularized systems,
i.e. typically on Linux distros.

The problem addressed in the commit above is that sst_dsp_new() and
sst_dsp_free() includes the firmware init / finish that call dw_*()
functions.  Thus building it as built-in with DW_DMAC_CORE module
results in the missing symbols.

However, these sst_dsp functions are basically called only from the
drivers that depend on DW_DMAC_CORE already.  That is, once when these
functions are split out, the rest can be independent from dw stuff.

This patch attempts to solve the issue by the following:
- Split sst-dsp stuff into two modules: snd-soc-sst-dsp and
  snd-soc-sst-firmware.
- Move sst_dsp_new() and sst_dsp_free() to the latter module so that
  the former module can be independent from DW_DMAC_CORE.
- Add a new kconfig SND_SOC_INTEL_SST_FIRMWARE to select the latter
  module by machine drivers.

One only remaining pitfall is that each machine driver has to select
SND_SOC_INTEL_SST_FIRMWARE carefully depending on DW_DMAC_CORE.
This can't be done cleanly due to the restriction of the current
kbuild.

Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=988117
Fixes: a92ea59b74e2 ('ASoC: Intel: sst: only select sst-firmware when DW DMAC is built-in')
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

6 files changed, 85 insertions, 78 deletions

diff --git a/sound/soc/intel/Kconfig b/sound/soc/intel/Kconfig
index 9c86459d0fc3..a20c3dfbcb5d 100644
--- a/sound/soc/intel/Kconfig
+++ b/sound/soc/intel/Kconfig
@@ -32,6 +32,12 @@ config SND_SOC_INTEL_SST
         select SND_SOC_INTEL_SST_MATCH if ACPI
         depends on (X86 || COMPILE_TEST)
 
+# firmware stuff depends DW_DMAC_CORE; since there is no depends-on from
+# the reverse selection, each machine driver needs to select
+# SND_SOC_INTEL_SST_FIRMWARE carefully depending on DW_DMAC_CORE
+config SND_SOC_INTEL_SST_FIRMWARE
+        tristate
+
 config SND_SOC_INTEL_SST_ACPI
         tristate
 
@@ -47,8 +53,9 @@ config SND_SOC_INTEL_BAYTRAIL
 config SND_SOC_INTEL_HASWELL_MACH
         tristate "ASoC Audio DSP support for Intel Haswell Lynxpoint"
         depends on X86_INTEL_LPSS && I2C && I2C_DESIGNWARE_PLATFORM
-        depends on DW_DMAC_CORE=y
+        depends on DW_DMAC_CORE
         select SND_SOC_INTEL_SST
+        select SND_SOC_INTEL_SST_FIRMWARE
         select SND_SOC_INTEL_HASWELL
         select SND_SOC_RT5640
         help
@@ -91,8 +98,9 @@ config SND_SOC_INTEL_BXT_RT298_MACH
 config SND_SOC_INTEL_BYT_RT5640_MACH
         tristate "ASoC Audio driver for Intel Baytrail with RT5640 codec"
         depends on X86_INTEL_LPSS && I2C
-        depends on DW_DMAC_CORE=y && (SND_SST_IPC_ACPI = n)
+        depends on DW_DMAC_CORE && (SND_SST_IPC_ACPI = n)
         select SND_SOC_INTEL_SST
+        select SND_SOC_INTEL_SST_FIRMWARE
         select SND_SOC_INTEL_BAYTRAIL
         select SND_SOC_RT5640
         help
@@ -103,8 +111,9 @@ config SND_SOC_INTEL_BYT_RT5640_MACH
 config SND_SOC_INTEL_BYT_MAX98090_MACH
         tristate "ASoC Audio driver for Intel Baytrail with MAX98090 codec"
         depends on X86_INTEL_LPSS && I2C
-        depends on DW_DMAC_CORE=y && (SND_SST_IPC_ACPI = n)
+        depends on DW_DMAC_CORE && (SND_SST_IPC_ACPI = n)
         select SND_SOC_INTEL_SST
+        select SND_SOC_INTEL_SST_FIRMWARE
         select SND_SOC_INTEL_BAYTRAIL
         select SND_SOC_MAX98090
         help
@@ -115,8 +124,9 @@ config SND_SOC_INTEL_BROADWELL_MACH
         tristate "ASoC Audio DSP support for Intel Broadwell Wildcatpoint"
         depends on X86_INTEL_LPSS && I2C && DW_DMAC && \
                    I2C_DESIGNWARE_PLATFORM
-        depends on DW_DMAC_CORE=y
+        depends on DW_DMAC_CORE
         select SND_SOC_INTEL_SST
+        select SND_SOC_INTEL_SST_FIRMWARE
         select SND_SOC_INTEL_HASWELL
         select SND_SOC_RT286
         help
diff --git a/sound/soc/intel/common/Makefile b/sound/soc/intel/common/Makefile
index fbbb25c2ceed..1a35149bcad7 100644
--- a/sound/soc/intel/common/Makefile
+++ b/sound/soc/intel/common/Makefile
@@ -2,9 +2,9 @@ snd-soc-sst-dsp-objs := sst-dsp.o
 snd-soc-sst-acpi-objs := sst-acpi.o
 snd-soc-sst-match-objs := sst-match-acpi.o
 snd-soc-sst-ipc-objs := sst-ipc.o
-
-snd-soc-sst-dsp-$(CONFIG_DW_DMAC_CORE) += sst-firmware.o
+snd-soc-sst-firmware-objs := sst-firmware.o
 
 obj-$(CONFIG_SND_SOC_INTEL_SST) += snd-soc-sst-dsp.o snd-soc-sst-ipc.o
 obj-$(CONFIG_SND_SOC_INTEL_SST_ACPI) += snd-soc-sst-acpi.o
 obj-$(CONFIG_SND_SOC_INTEL_SST_MATCH) += snd-soc-sst-match.o
+obj-$(CONFIG_SND_SOC_INTEL_SST_FIRMWARE) += snd-soc-sst-firmware.o
diff --git a/sound/soc/intel/common/sst-dsp-priv.h b/sound/soc/intel/common/sst-dsp-priv.h
index 97dc1ae05e69..d13c84364c3c 100644
--- a/sound/soc/intel/common/sst-dsp-priv.h
+++ b/sound/soc/intel/common/sst-dsp-priv.h
@@ -383,10 +383,6 @@ struct sst_mem_block *sst_mem_block_register(struct sst_dsp *dsp, u32 offset,
         u32 index, void *private);
 void sst_mem_block_unregister_all(struct sst_dsp *dsp);
 
-/* Create/Free DMA resources */
-int sst_dma_new(struct sst_dsp *sst);
-void sst_dma_free(struct sst_dma *dma);
-
 u32 sst_dsp_get_offset(struct sst_dsp *dsp, u32 offset,
         enum sst_mem_type type);
 #endif
diff --git a/sound/soc/intel/common/sst-dsp.c b/sound/soc/intel/common/sst-dsp.c
index ff2196ef359f..c00ede4ea4d7 100644
--- a/sound/soc/intel/common/sst-dsp.c
+++ b/sound/soc/intel/common/sst-dsp.c
@@ -420,73 +420,6 @@ void sst_dsp_inbox_read(struct sst_dsp *sst, void *message, size_t bytes)
 }
 EXPORT_SYMBOL_GPL(sst_dsp_inbox_read);
 
-#ifdef CONFIG_DW_DMAC_CORE
-struct sst_dsp *sst_dsp_new(struct device *dev,
-        struct sst_dsp_device *sst_dev, struct sst_pdata *pdata)
-{
-        struct sst_dsp *sst;
-        int err;
-
-        dev_dbg(dev, "initialising audio DSP id 0x%x\n", pdata->id);
-
-        sst = devm_kzalloc(dev, sizeof(*sst), GFP_KERNEL);
-        if (sst == NULL)
-                return NULL;
-
-        spin_lock_init(&sst->spinlock);
-        mutex_init(&sst->mutex);
-        sst->dev = dev;
-        sst->dma_dev = pdata->dma_dev;
-        sst->thread_context = sst_dev->thread_context;
-        sst->sst_dev = sst_dev;
-        sst->id = pdata->id;
-        sst->irq = pdata->irq;
-        sst->ops = sst_dev->ops;
-        sst->pdata = pdata;
-        INIT_LIST_HEAD(&sst->used_block_list);
-        INIT_LIST_HEAD(&sst->free_block_list);
-        INIT_LIST_HEAD(&sst->module_list);
-        INIT_LIST_HEAD(&sst->fw_list);
-        INIT_LIST_HEAD(&sst->scratch_block_list);
-
-        /* Initialise SST Audio DSP */
-        if (sst->ops->init) {
-                err = sst->ops->init(sst, pdata);
-                if (err < 0)
-                        return NULL;
-        }
-
-        /* Register the ISR */
-        err = request_threaded_irq(sst->irq, sst->ops->irq_handler,
-                sst_dev->thread, IRQF_SHARED, "AudioDSP", sst);
-        if (err)
-                goto irq_err;
-
-        err = sst_dma_new(sst);
-        if (err)
-                dev_warn(dev, "sst_dma_new failed %d\n", err);
-
-        return sst;
-
-irq_err:
-        if (sst->ops->free)
-                sst->ops->free(sst);
-
-        return NULL;
-}
-EXPORT_SYMBOL_GPL(sst_dsp_new);
-
-void sst_dsp_free(struct sst_dsp *sst)
-{
-        free_irq(sst->irq, sst);
-        if (sst->ops->free)
-                sst->ops->free(sst);
-
-        sst_dma_free(sst->dma);
-}
-EXPORT_SYMBOL_GPL(sst_dsp_free);
-#endif
-
 /* Module information */
 MODULE_AUTHOR("Liam Girdwood");
 MODULE_DESCRIPTION("Intel SST Core");
diff --git a/sound/soc/intel/common/sst-dsp.h b/sound/soc/intel/common/sst-dsp.h
index 0b84c719ec48..859f0de00339 100644
--- a/sound/soc/intel/common/sst-dsp.h
+++ b/sound/soc/intel/common/sst-dsp.h
@@ -216,7 +216,7 @@ struct sst_pdata {
         void *dsp;
 };
 
-#ifdef CONFIG_DW_DMAC_CORE
+#if IS_ENABLED(CONFIG_DW_DMAC_CORE)
 /* Initialization */
 struct sst_dsp *sst_dsp_new(struct device *dev,
         struct sst_dsp_device *sst_dev, struct sst_pdata *pdata);
diff --git a/sound/soc/intel/common/sst-firmware.c b/sound/soc/intel/common/sst-firmware.c
index 25993527370b..a086c35f91bb 100644
--- a/sound/soc/intel/common/sst-firmware.c
+++ b/sound/soc/intel/common/sst-firmware.c
@@ -1211,3 +1211,71 @@ u32 sst_dsp_get_offset(struct sst_dsp *dsp, u32 offset,
         }
 }
 EXPORT_SYMBOL_GPL(sst_dsp_get_offset);
+
+struct sst_dsp *sst_dsp_new(struct device *dev,
+        struct sst_dsp_device *sst_dev, struct sst_pdata *pdata)
+{
+        struct sst_dsp *sst;
+        int err;
+
+        dev_dbg(dev, "initialising audio DSP id 0x%x\n", pdata->id);
+
+        sst = devm_kzalloc(dev, sizeof(*sst), GFP_KERNEL);
+        if (sst == NULL)
+                return NULL;
+
+        spin_lock_init(&sst->spinlock);
+        mutex_init(&sst->mutex);
+        sst->dev = dev;
+        sst->dma_dev = pdata->dma_dev;
+        sst->thread_context = sst_dev->thread_context;
+        sst->sst_dev = sst_dev;
+        sst->id = pdata->id;
+        sst->irq = pdata->irq;
+        sst->ops = sst_dev->ops;
+        sst->pdata = pdata;
+        INIT_LIST_HEAD(&sst->used_block_list);
+        INIT_LIST_HEAD(&sst->free_block_list);
+        INIT_LIST_HEAD(&sst->module_list);
+        INIT_LIST_HEAD(&sst->fw_list);
+        INIT_LIST_HEAD(&sst->scratch_block_list);
+
+        /* Initialise SST Audio DSP */
+        if (sst->ops->init) {
+                err = sst->ops->init(sst, pdata);
+                if (err < 0)
+                        return NULL;
+        }
+
+        /* Register the ISR */
+        err = request_threaded_irq(sst->irq, sst->ops->irq_handler,
+                sst_dev->thread, IRQF_SHARED, "AudioDSP", sst);
+        if (err)
+                goto irq_err;
+
+        err = sst_dma_new(sst);
+        if (err)
+                dev_warn(dev, "sst_dma_new failed %d\n", err);
+
+        return sst;
+
+irq_err:
+        if (sst->ops->free)
+                sst->ops->free(sst);
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(sst_dsp_new);
+
+void sst_dsp_free(struct sst_dsp *sst)
+{
+        free_irq(sst->irq, sst);
+        if (sst->ops->free)
+                sst->ops->free(sst);
+
+        sst_dma_free(sst->dma);
+}
+EXPORT_SYMBOL_GPL(sst_dsp_free);
+
+MODULE_DESCRIPTION("Intel SST Firmware Loader");
+MODULE_LICENSE("GPL v2");