From ea1af9f26bdbe3c9ed5ffb8ce982dc45edfaf680 Mon Sep 17 00:00:00 2001 From: Philipp Tomsich Date: Fri, 28 Oct 2016 18:21:29 +0800 Subject: sunxi: add gtbus-initialisation for sun9i On sun9i, the GTBUS manages transaction priority and bandwidth for multiple read ports when accessing DRAM. The initialisation mirrors the settings from Allwinner's boot0 for now, even though this may not be optimal for all applications (e.g. headless systems might want to give priority to IO modules). Adding a common callout to gtbus_init() from the SPL clock init with a weakly defined implementation in sunxi/clock.c to fallback to for platforms that don't require this. [wens@csie.org: Moved gtbus_sun9i.c to arch/arm/mach-sunxi/; style cleanup] Signed-off-by: Chen-Yu Tsai Acked-by: Hans de Goede Signed-off-by: Hans de Goede --- arch/arm/mach-sunxi/gtbus_sun9i.c | 48 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 arch/arm/mach-sunxi/gtbus_sun9i.c (limited to 'arch/arm/mach-sunxi/gtbus_sun9i.c') diff --git a/arch/arm/mach-sunxi/gtbus_sun9i.c b/arch/arm/mach-sunxi/gtbus_sun9i.c new file mode 100644 index 00000000000..c20d3c07712 --- /dev/null +++ b/arch/arm/mach-sunxi/gtbus_sun9i.c @@ -0,0 +1,48 @@ +/* + * GTBUS initialisation for sun9i + * + * (C) Copyright 2016 Theobroma Systems Design und Consulting GmbH + * Philipp Tomsich + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include + +#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), + >bus->mst_read_prio_cfg[0]); + + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_FE0]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_FE0]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_BE1]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_BE2]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_IEP0]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_FE1]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_BE0]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_FE2]); + writel(GP_MST_CFG_DEFAULT, >bus->mst_cfg[GT_PORT_IEP1]); +} + +#endif -- cgit v1.2.3