[PATCH 1/4] mach-k3: common.c: Add dma device remove in spl exit

[Prasanth Babu Mantena]

While exiting from spl, remove any dma device active through
spl_board_prepare_for_boot(). This is required for cleaning up
any dma channels being used in spl and avoid issues with overlapping
channel allocation in the next stage bootloaders.

Signed-off-by: Prasanth Babu Mantena <p-mantena at ti.com>
---
 arch/arm/mach-k3/common.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index df48ec8d47..982dc76b00 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -28,6 +28,8 @@
 #include <env.h>
 #include <elf.h>
 #include <soc.h>
+#include <dm/uclass-internal.h>
+#include <dm/device-internal.h>
 
 #include <asm/arch/k3-qos.h>
 
@@ -246,12 +248,31 @@ void spl_enable_cache(void)
 #endif
 }
 
-#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
+static __maybe_unused void k3_dma_remove(void)
+{
+	struct udevice *dev;
+	int rc;
+
+	rc = uclass_find_device(UCLASS_DMA, 0, &dev);
+	if (!rc && dev) {
+		rc = device_remove(dev, DM_REMOVE_NORMAL);
+		if (rc)
+			pr_warn("Cannot remove dma device '%s' (err=%d)\n",
+				dev->name, rc);
+	}
+}
+
 void spl_board_prepare_for_boot(void)
 {
+#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
 	dcache_disable();
+#endif
+#if IS_ENABLED(CONFIG_SPL_DMA) && IS_ENABLED(CONFIG_SPL_DM_DEVICE_REMOVE)
+	k3_dma_remove();
+#endif
 }
 
+#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
 void spl_board_prepare_for_linux(void)
 {
 	dcache_disable();
-- 
2.34.1