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