1 /*
2  * GTBUS initialisation for sun9i
3  *
4  * (C) Copyright 2016 Theobroma Systems Design und Consulting GmbH
5  *                    Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <asm/io.h>
12 #include <asm/arch/gtbus_sun9i.h>
13 #include <asm/arch/sys_proto.h>
14 
15 #ifdef CONFIG_SPL_BUILD
16 
17 void gtbus_init(void)
18 {
19 	struct sunxi_gtbus_reg * const gtbus =
20 		(struct sunxi_gtbus_reg *)SUNXI_GTBUS_BASE;
21 
22 	/*
23 	 * We use the same setting that Allwinner used in Boot0 for now.
24 	 * It may be advantageous to adjust these for various workloads
25 	 * (e.g. headless use cases that focus on IO throughput).
26 	 */
27 	writel((GT_PRIO_HIGH << GT_PORT_FE0) |
28 	       (GT_PRIO_HIGH << GT_PORT_BE1) |
29 	       (GT_PRIO_HIGH << GT_PORT_BE2) |
30 	       (GT_PRIO_HIGH << GT_PORT_IEP0) |
31 	       (GT_PRIO_HIGH << GT_PORT_FE1) |
32 	       (GT_PRIO_HIGH << GT_PORT_BE0) |
33 	       (GT_PRIO_HIGH << GT_PORT_FE2) |
34 	       (GT_PRIO_HIGH << GT_PORT_IEP1),
35 	       &gtbus->mst_read_prio_cfg[0]);
36 
37 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE0]);
38 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE0]);
39 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_BE1]);
40 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_BE2]);
41 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_IEP0]);
42 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE1]);
43 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_BE0]);
44 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_FE2]);
45 	writel(GP_MST_CFG_DEFAULT, &gtbus->mst_cfg[GT_PORT_IEP1]);
46 }
47 
48 #endif
49