hikey960: enable IOMCU DMAC

There exists a third DMA controller on the hi3660
SoC called the IOMCU DMAC. This controller is used by
peripherals like SPI2 and UART3. Initialize channels 4-7
as non-secure, while 0-3 remain reserved and secure.
Signed-off-by: Ryan Grachek <ryan@edited.us>

plat/hisilicon/hikey960/hikey960_bl31_setup.c

@@ -141,6 +141,21 @@ static void hikey960_edma_init(void)
 	}
 }
 
+static void hikey960_iomcu_dma_init(void)
+{
+	int i;
+	uint32_t non_secure;
+
+	non_secure = IOMCU_DMAC_SEC_CTRL_INTR_SEC | IOMCU_DMAC_SEC_CTRL_GLOBAL_SEC;
+	mmio_write_32(IOMCU_DMAC_SEC_CTRL, non_secure);
+
+	/* channels 0-3 are reserved */
+	for (i = 4; i < IOMCU_DMAC_CHANNEL_NUMS; i++) {
+		mmio_write_32(IOMCU_DMAC_AXI_CONF(i), IOMCU_DMAC_AXI_CONF_ARPROT_NS |
+				 IOMCU_DMAC_AXI_CONF_AWPROT_NS);
+	}
+}
+
 void bl31_platform_setup(void)
 {
 	/* Initialize the GIC driver, cpu and distributor interfaces */
@@ -150,6 +165,7 @@ void bl31_platform_setup(void)
 	gicv2_cpuif_enable();
 
 	hikey960_edma_init();
+	hikey960_iomcu_dma_init();
 
 	hisi_ipc_init();
 }

plat/hisilicon/hikey960/include/hi3660.h

@@ -373,4 +373,13 @@
 #define EDMAC_SEC_CTRL_GLOBAL_SEC		(1 << 0)
 #define EDMAC_CHANNEL_NUMS				16
 
+#define IOMCU_DMAC_BASE			0xffd77000
+#define IOMCU_DMAC_SEC_CTRL		(IOMCU_DMAC_BASE + 0x694)
+#define IOMCU_DMAC_AXI_CONF(x)			(IOMCU_DMAC_BASE + 0x820 + ((x) << 6))
+#define IOMCU_DMAC_AXI_CONF_ARPROT_NS		(1 << 6)
+#define IOMCU_DMAC_AXI_CONF_AWPROT_NS		(1 << 18)
+#define IOMCU_DMAC_SEC_CTRL_INTR_SEC	(1 << 1)
+#define IOMCU_DMAC_SEC_CTRL_GLOBAL_SEC	(1 << 0)
+#define IOMCU_DMAC_CHANNEL_NUMS			8
+
 #endif /* HI3660_H */