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path: root/include/linux/ti-emif-sram.h
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2022-06-10treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_30.RULE ↵Thomas Gleixner1-9/+1
(part 2) Based on the normalized pattern: this program is free software you can redistribute it and/or modify it under the terms of the gnu general public license as published by the free software foundation version 2 this program is distributed as is without any warranty of any kind whether express or implied without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference. Reviewed-by: Allison Randal <allison@lohutok.net> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-09memory: ti-emif-sram: Add ti_emif_run_hw_leveling for DDR3 hardware levelingDave Gerlach1-0/+3
In certain situations, such as when returning from low power modes, the EMIF must re-run hardware leveling to properly restore DDR3 access. This is accomplished by introducing a new ti-emif-sram-pm call, ti_emif_run_hw_leveling, to check if DDR3 is in use and if so, trigger the full write and read leveling processes. Suggested-by: Brad Griffis <bgriffis@ti.com> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Acked-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2018-04-18ARM: OMAP2+: Fix build when using split object directoriesDave Gerlach1-0/+75
The sleep33xx and sleep43xx files should not depend on a header file generated in drivers/memory. Remove this dependency and instead allow both drivers/memory and arch/arm/mach-omap2 to generate all macros needed in headers local to their own paths. This fixes an issue where the build fail will when using O= to set a split object directory and arch/arm/mach-omap2 is built before drivers/memory with the following error: .../drivers/memory/emif-asm-offsets.c:1:0: fatal error: can't open drivers/memory/emif-asm-offsets.s for writing: No such file or directory compilation terminated. Fixes: 41d9d44d7258 ("ARM: OMAP2+: pm33xx-core: Add platform code needed for PM") Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Acked-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
2017-12-03memory: ti-emif-sram: introduce relocatable suspend/resume handlersDave Gerlach1-0/+69
Certain SoCs like Texas Instruments AM335x and AM437x require parts of the EMIF PM code to run late in the suspend sequence from SRAM, such as saving and restoring the EMIF context and placing the memory into self-refresh. One requirement for these SoCs to suspend and enter its lowest power mode, called DeepSleep0, is that the PER power domain must be shut off. Because the EMIF (DDR Controller) resides within this power domain, it will lose context during a suspend operation, so we must save it so we can restore once we resume. However, we cannot execute this code from external memory, as it is not available at this point, so the code must be executed late in the suspend path from SRAM. This patch introduces a ti-emif-sram driver that includes several functions written in ARM ASM that are relocatable so the PM SRAM code can use them. It also allocates a region of writable SRAM to be used by the code running in the executable region of SRAM to save and restore the EMIF context. It can export a table containing the absolute addresses of the available PM functions so that other SRAM code can branch to them. This code is required for suspend/resume on AM335x and AM437x to work. In addition to this, to be able to share data structures between C and the ti-emif-sram-pm assembly code, we can automatically generate all of the C struct member offsets and sizes as macros by processing emif-asm-offsets.c into assembly code and then extracting the relevant data as is done for the generated platform asm-offsets.h files. Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>