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

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * GTBUS initialisation for sun9i
+ *
+ * (C) Copyright 2016 Theobroma Systems Design und Consulting GmbH
+ *                    Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/gtbus_sun9i.h>
+#include <asm/arch/sys_proto.h>
+
+#ifdef CONFIG_SPL_BUILD
+
+void gtbus_init(void)
+{
+	struct sunxi_gtbus_reg * const gtbus =
+		(struct sunxi_gtbus_reg *)SUNXI_GTBUS_BASE;
+
+	/*
+	 * We use the same setting that Allwinner used in Boot0 for now.
+	 * It may be advantageous to adjust these for various workloads
+	 * (e.g. headless use cases that focus on IO throughput).
+	 */
+	writel((GT_PRIO_HIGH << GT_PORT_FE0) |
+	       (GT_PRIO_HIGH << GT_PORT_BE1) |
+	       (GT_PRIO_HIGH << GT_PORT_BE2) |
+	       (GT_PRIO_HIGH << GT_PORT_IEP0) |
+	       (GT_PRIO_HIGH << GT_PORT_FE1) |
+	       (GT_PRIO_HIGH << GT_PORT_BE0) |
+	       (GT_PRIO_HIGH << GT_PORT_FE2) |
+	       (GT_PRIO_HIGH << GT_PORT_IEP1),
+	       &gtbus->mst_read_prio_cfg[0]);
+
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE0]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE0]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_BE1]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_BE2]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_IEP0]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE1]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_BE0]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE2]);
+	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_IEP1]);
+}
+
+#endif