dsp: ion: Remove smmu initialization

SMMU initialization is not required to be done in client
probe process. SMMU framework takes care of creating
domain and attaching device. Remove related code from
audio ion driver.

Change-Id: I3756c5abb7488afb43e20fae698c7008461a18cb
Signed-off-by: Meng Wang <[email protected]>

dsp/msm_audio_ion.c

@@ -13,13 +13,11 @@
 #include <linux/list.h>
 #include <linux/dma-mapping.h>
 #include <linux/dma-buf.h>
-#include <linux/iommu.h>
 #include <linux/platform_device.h>
 #include <linux/of_device.h>
 #include <linux/export.h>
 #include <linux/ion_kernel.h>
 #include <ipc/apr.h>
-#include <asm/dma-iommu.h>
 #include <dsp/msm_audio_ion.h>
 
 #define MSM_AUDIO_ION_PROBED (1 << 0)
@@ -27,21 +25,16 @@
 #define MSM_AUDIO_ION_PHYS_ADDR(alloc_data) \
 	alloc_data->table->sgl->dma_address
 
-#define MSM_AUDIO_ION_VA_START 0x10000000
-#define MSM_AUDIO_ION_VA_LEN 0x0FFFFFFF
-
 #define MSM_AUDIO_SMMU_SID_OFFSET 32
 
 struct msm_audio_ion_private {
 	bool smmu_enabled;
 	struct device *cb_dev;
-	struct dma_iommu_mapping *mapping;
 	u8 device_status;
 	struct list_head alloc_list;
 	struct mutex list_mutex;
 	u64 smmu_sid_bits;
 	u32 smmu_version;
-	u32 iova_start_addr;
 };
 
 struct msm_audio_alloc_data {
@@ -654,31 +647,10 @@ EXPORT_SYMBOL(msm_audio_populate_upper_32_bits);
 
 static int msm_audio_smmu_init(struct device *dev)
 {
-	struct dma_iommu_mapping *mapping;
-	int ret;
-
-	mapping = arm_iommu_create_mapping(&platform_bus_type,
-					   msm_audio_ion_data.iova_start_addr,
-					   MSM_AUDIO_ION_VA_LEN);
-	if (IS_ERR(mapping))
-		return PTR_ERR(mapping);
-
-	ret = arm_iommu_attach_device(dev, mapping);
-	if (ret) {
-		dev_err(dev, "%s: Attach failed, err = %d\n",
-			__func__, ret);
-		goto fail_attach;
-	}
-
-	msm_audio_ion_data.mapping = mapping;
 	INIT_LIST_HEAD(&msm_audio_ion_data.alloc_list);
 	mutex_init(&(msm_audio_ion_data.list_mutex));
 
 	return 0;
-
-fail_attach:
-	arm_iommu_release_mapping(mapping);
-	return ret;
 }
 
 static const struct of_device_id msm_audio_ion_dt_match[] = {
@@ -694,7 +666,6 @@ static int msm_audio_ion_probe(struct platform_device *pdev)
 	u64 smmu_sid_mask = 0;
 	const char *msm_audio_ion_dt = "qcom,smmu-enabled";
 	const char *msm_audio_ion_smmu = "qcom,smmu-version";
-	const char *msm_audio_ion_iova_start_addr = "qcom,iova-start-addr";
 	const char *msm_audio_ion_smmu_sid_mask = "qcom,smmu-sid-mask";
 	bool smmu_enabled;
 	enum apr_subsys_state q6_state;
@@ -740,18 +711,6 @@ static int msm_audio_ion_probe(struct platform_device *pdev)
 	dev_dbg(dev, "%s: SMMU is Enabled. SMMU version is (%d)",
 		__func__, msm_audio_ion_data.smmu_version);
 
-	rc = of_property_read_u32(dev->of_node,
-				msm_audio_ion_iova_start_addr,
-				&msm_audio_ion_data.iova_start_addr);
-	if (rc) {
-		dev_dbg(dev,
-			"%s: qcom,iova_start_addr missing in DT node, initialize with default val\n",
-			__func__);
-		msm_audio_ion_data.iova_start_addr = MSM_AUDIO_ION_VA_START;
-	} else {
-		dev_dbg(dev, "%s:IOVA start addr: 0x%x\n",
-			__func__, msm_audio_ion_data.iova_start_addr);
-	}
 	/* Get SMMU SID information from Devicetree */
 	rc = of_property_read_u64(dev->of_node,
 				  msm_audio_ion_smmu_sid_mask,
@@ -796,17 +755,10 @@ exit:
 
 static int msm_audio_ion_remove(struct platform_device *pdev)
 {
-	struct dma_iommu_mapping *mapping;
 	struct device *audio_cb_dev;
 
-	mapping = msm_audio_ion_data.mapping;
 	audio_cb_dev = msm_audio_ion_data.cb_dev;
 
-	if (audio_cb_dev && mapping) {
-		arm_iommu_detach_device(audio_cb_dev);
-		arm_iommu_release_mapping(mapping);
-	}
-
 	msm_audio_ion_data.smmu_enabled = 0;
 	msm_audio_ion_data.device_status = 0;
 	return 0;