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memory: tegra: Add EMC (external memory controller) driver 

Implements functionality needed to change the rate of the memory bus
clock.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Mikko Perttunen 2015-03-12 15:48:03 +01:00 committed by Thierry Reding
parent 3d9dd6fdd2
commit 73a7f0a906
4 changed files with 1123 additions and 0 deletions
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10
drivers/memory/tegra/Kconfig
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@ -5,3 +5,13 @@ config TEGRA_MC
help
This driver supports the Memory Controller (MC) hardware found on
NVIDIA Tegra SoCs.
config TEGRA124_EMC
bool "NVIDIA Tegra124 External Memory Controller driver"
default y
depends on TEGRA_MC && ARCH_TEGRA_124_SOC
help
This driver is for the External Memory Controller (EMC) found on
Tegra124 chips. The EMC controls the external DRAM on the board.
This driver is required to change memory timings / clock rate for
external memory.

2
drivers/memory/tegra/Makefile
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@ -5,3 +5,5 @@ tegra-mc-$(CONFIG_ARCH_TEGRA_114_SOC) += tegra114.o
tegra-mc-$(CONFIG_ARCH_TEGRA_124_SOC) += tegra124.o
obj-$(CONFIG_TEGRA_MC) += tegra-mc.o
obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o

1092
drivers/memory/tegra/tegra124-emc.c Normal file
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19
include/soc/tegra/emc.h Normal file
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@ -0,0 +1,19 @@
/*
* Copyright (c) 2014 NVIDIA Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __SOC_TEGRA_EMC_H__
#define __SOC_TEGRA_EMC_H__
struct tegra_emc;
int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
unsigned long rate);
void tegra_emc_complete_timing_change(struct tegra_emc *emc,
unsigned long rate);
#endif /* __SOC_TEGRA_EMC_H__ */