GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/board/mscc/common/spi.c

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2018 Microsemi Coprporation
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <spi.h>
+
+void external_cs_manage(struct udevice *dev, bool enable)
+{
+	u32 cs = spi_chip_select(dev);
+	/* IF_SI0_OWNER, select the owner of the SI interface
+	 * Encoding: 0: SI Slave
+	 *	     1: SI Boot Master
+	 *	     2: SI Master Controller
+	 */
+	if (!enable) {
+		writel(ICPU_SW_MODE_SW_PIN_CTRL_MODE |
+		       ICPU_SW_MODE_SW_SPI_CS(BIT(cs)),
+		       BASE_CFG + ICPU_SW_MODE);
+		clrsetbits_le32(BASE_CFG + ICPU_GENERAL_CTRL,
+				ICPU_GENERAL_CTRL_IF_SI_OWNER_M,
+				ICPU_GENERAL_CTRL_IF_SI_OWNER(2));
+	} else {
+		writel(0, BASE_CFG + ICPU_SW_MODE);
+		clrsetbits_le32(BASE_CFG + ICPU_GENERAL_CTRL,
+				ICPU_GENERAL_CTRL_IF_SI_OWNER_M,
+				ICPU_GENERAL_CTRL_IF_SI_OWNER(1));
+	}
+}