soc: Move esp_ptr_dma_capable() function to soc_memory_layout.h

components/driver/spi_master.c

@@ -53,6 +53,7 @@ queue and re-enabling the interrupt will trigger the interrupt again, which can
 #include "freertos/task.h"
 #include "freertos/ringbuf.h"
 #include "soc/soc.h"
+#include "soc/soc_memory_layout.h"
 #include "soc/dport_reg.h"
 #include "rom/lldesc.h"
 #include "driver/gpio.h"

components/driver/spi_slave.c

@@ -32,6 +32,7 @@
 #include "freertos/task.h"
 #include "freertos/ringbuf.h"
 #include "soc/soc.h"
+#include "soc/soc_memory_layout.h"
 #include "soc/dport_reg.h"
 #include "rom/lldesc.h"
 #include "driver/gpio.h"

components/soc/esp32/include/soc/soc.h

@@ -287,6 +287,10 @@
 #define SOC_DIRAM_DRAM_LOW    0x3FFE0000
 #define SOC_DIRAM_DRAM_HIGH   0x3FFFFFFC
 
+// Region of memory accessible via DMA. See esp_ptr_dma_capable().
+#define SOC_DMA_LOW  0x3FFAE000
+#define SOC_DMA_HIGH 0x40000000
+
 //Interrupt hardware source table
 //This table is decided by hardware, don't touch this.
 #define ETS_WIFI_MAC_INTR_SOURCE                0/**< interrupt of WiFi MAC, level*/

components/soc/include/soc/soc_memory_layout.h

@@ -58,4 +58,7 @@ typedef struct
 extern const soc_reserved_region_t soc_reserved_regions[];
 extern const size_t soc_reserved_region_count;
 
-
+inline bool esp_ptr_dma_capable(const void *p)
+{
+    return (intptr_t)p >= SOC_DMA_LOW && (intptr_t)p < SOC_DMA_HIGH;
+}