dmaengine: dw-axi-dmac-starfive: Remove calls specific to ARM64 ACPI

iort_dma_setup() is being removed by commit db59e1b ("ACPI:
arm64: Move DMA setup operations out of IORT") in iommu/next:

    drivers/dma/dw-axi-dmac-starfive/starfive_dmaengine_memcpy.c: In function ‘dw_dma_async_
    do_memcpy’:
    drivers/dma/dw-axi-dmac-starfive/starfive_dmaengine_memcpy.c:152:2: error: implicit decl
    aration of function ‘iort_dma_setup’ [-Werror=implicit-function-declaration]
      152 |  iort_dma_setup(dma_dev, &dma_addr, &dma_size);
	  |  ^~~~~~~~~~~~~~
    drivers/dma/dw-axi-dmac-starfive/starfive_dmaengine_memcpy.c:153:8: warning: assignment to ‘const struct iommu_ops *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
      153 |  iommu = iort_iommu_configure_id(dma_dev, NULL);
	  |        ^
    drivers/dma/dw-axi-dmac-starfive/starfive_dmaengine_memcpy.c: In function ‘dw_dma_memcpy_raw’:
    drivers/dma/dw-axi-dmac-starfive/starfive_dmaengine_memcpy.c:223:8: warning: assignment to ‘const struct iommu_ops *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
      223 |  iommu = iort_iommu_configure_id(dma_dev, NULL);
	  |        ^

iort_dma_setup() and iort_iommu_configure_id() are part of the ARM64
ACPI implementation.  As CONFIG_ACPI_IORT cannot be enabled on RISC-V,
they were dummies anyway, so these calls can just be removed.

[Emil: remove unused local variables too]

Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Emil Renner Berthing <[email protected]>
---
Boot-tested, but the affected code paths were not exercised.

drivers/dma/dw-axi-dmac-starfive/starfive_dmaengine_memcpy.c

@@ -138,9 +138,6 @@ int dw_dma_async_do_memcpy(void *src, void *dst, size_t size)
 	dma_addr_t src_dma, dst_dma;
 	struct dma_async_tx_descriptor *desc;
 
-	const struct iommu_ops *iommu;
-	u64 dma_addr = 0, dma_size = 0;
-
 	dma_dev = kzalloc(sizeof(*dma_dev), GFP_KERNEL);
 	if(!dma_dev){
 		dev_err(dma_dev, "kmalloc error.\n");
@@ -150,12 +147,7 @@ int dw_dma_async_do_memcpy(void *src, void *dst, size_t size)
 	dma_dev->bus = NULL;
 	dma_dev->coherent_dma_mask = 0xffffffff;
 
-	iort_dma_setup(dma_dev, &dma_addr, &dma_size);
-	iommu = iort_iommu_configure_id(dma_dev, NULL);
-	if (PTR_ERR(iommu) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-
-	arch_setup_dma_ops(dma_dev, dst_dma, dma_size, iommu, true);
+	arch_setup_dma_ops(dma_dev, dst_dma, 0, NULL, true);
 
 	if(_dma_async_alloc_buf(dma_dev, &src, &dst, size, &src_dma, &dst_dma)) {
 		dev_err(dma_dev, "Err alloc.\n");
@@ -208,9 +200,6 @@ int dw_dma_memcpy_raw(dma_addr_t src_dma, dma_addr_t dst_dma, size_t size)
 	struct device *dma_dev;
 	struct dma_async_tx_descriptor *desc;
 
-	const struct iommu_ops *iommu;
-	u64 dma_addr = 0, dma_size = 0;
-
 	dma_dev = kzalloc(sizeof(*dma_dev), GFP_KERNEL);
 	if(!dma_dev){
 		DMA_PRINTK("kmalloc error.\n");
@@ -220,12 +209,7 @@ int dw_dma_memcpy_raw(dma_addr_t src_dma, dma_addr_t dst_dma, size_t size)
 	dma_dev->bus = NULL;
 	dma_dev->coherent_dma_mask = 0xffffffff;
 
-	iort_dma_setup(dma_dev, &dma_addr, &dma_size);
-	iommu = iort_iommu_configure_id(dma_dev, NULL);
-	if (PTR_ERR(iommu) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-
-	arch_setup_dma_ops(dma_dev, dst_dma, dma_size, iommu, true);
+	arch_setup_dma_ops(dma_dev, dst_dma, 0, NULL, true);
 
 	chan = _dma_get_channel(DMA_MEMCPY);
 	if(!chan){