From 6c51df6859fa666d494980f4aa2f19c932898ec1 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 23 Jun 2015 15:39:04 -0600 Subject: dm: Add support for RAM drivers Add support for a driver which sets up DRAM and can return information about the amount of RAM available. This is a first step towards moving RAM init to driver model. Signed-off-by: Simon Glass --- drivers/ram/Kconfig | 18 ++++++++++++++++++ drivers/ram/Makefile | 7 +++++++ drivers/ram/ram-uclass.c | 28 ++++++++++++++++++++++++++++ 3 files changed, 53 insertions(+) create mode 100644 drivers/ram/Kconfig create mode 100644 drivers/ram/Makefile create mode 100644 drivers/ram/ram-uclass.c (limited to 'drivers/ram') diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig new file mode 100644 index 0000000000..642a2d8948 --- /dev/null +++ b/drivers/ram/Kconfig @@ -0,0 +1,18 @@ +config RAM + bool "Enable RAM drivers using Driver Model" + depends on DM + help + This allows drivers to be provided for SDRAM and other RAM + controllers and their type to be specified in the board's device + tree. Generally some parameters are required to set up the RAM and + the RAM size can either be statically defined or dynamically + detected. + +config SPL_RAM_SUPPORT + bool "Enable RAM support in SPL" + depends on RAM + help + The RAM subsystem adds a small amount of overhead to the image. + If this is acceptable and you have a need to use RAM drivers in + SPL, enable this option. It might provide a cleaner interface to + setting up RAM (e.g. SDRAM / DDR) within SPL. diff --git a/drivers/ram/Makefile b/drivers/ram/Makefile new file mode 100644 index 0000000000..4494d8187b --- /dev/null +++ b/drivers/ram/Makefile @@ -0,0 +1,7 @@ +# +# Copyright (c) 2015 Google, Inc +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# SPDX-License-Identifier: GPL-2.0+ +# +obj-$(CONFIG_RAM) += ram-uclass.o diff --git a/drivers/ram/ram-uclass.c b/drivers/ram/ram-uclass.c new file mode 100644 index 0000000000..2f1fbe7c97 --- /dev/null +++ b/drivers/ram/ram-uclass.c @@ -0,0 +1,28 @@ +/* + * Copyright (C) 2015 Google, Inc + * Written by Simon Glass + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include +#include + +int ram_get_info(struct udevice *dev, struct ram_info *info) +{ + struct ram_ops *ops = ram_get_ops(dev); + + if (!ops->get_info) + return -ENOSYS; + + return ops->get_info(dev, info); +} + +UCLASS_DRIVER(ram) = { + .id = UCLASS_RAM, + .name = "ram", +}; -- cgit v1.2.1