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| author |   Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2014-11-21 17:00:04 +0100 |
|---|---|---|
| committer |   Jason Cooper <jason@lakedaemon.net> | 2014-11-30 16:40:11 +0000 |
| commit | 4749c02b8da6d8dbc29218652985bda844017e95 (patch) | |
| tree | 992fd5ce8e264a02637ec8be69a828b16807c75f /include/linux/mbus.h | |
| parent | bus: mvebu-mbus: suspend/resume support (diff) | |
| download | linux-dev-4749c02b8da6d8dbc29218652985bda844017e95.tar.xz linux-dev-4749c02b8da6d8dbc29218652985bda844017e95.zip | |
bus: mvebu-mbus: provide a mechanism to save SDRAM window configuration
On Marvell EBU platforms, when doing suspend/resume, the SDRAM window
configuration must be saved on suspend, and restored on
resume. However, it needs to be restored on resume *before*
re-entering the kernel, because the SDRAM window configuration defines
the layout of the memory. For this reason, it cannot simply be done in
the ->suspend() and ->resume() hooks of the mvebu-mbus driver.
Instead, it needs to be restored by the bootloader "boot info"
mechanism used when resuming. This mechanism allows the kernel to
define a list of (address, value) pairs when suspending, that the
bootloader will restore on resume before jumping back into the kernel.
This commit therefore adds a new function to the mvebu-mbus driver,
called mvebu_mbus_save_cpu_target(), which will be called by the
platform code to make the mvebu-mbus driver save the SDRAM window
configuration in a way that can be understood by the bootloader "boot
info" mechanism.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1416585613-2113-8-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'include/linux/mbus.h')
| -rw-r--r-- | include/linux/mbus.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mbus.h b/include/linux/mbus.h index 550c88fb0267..611b69fa8594 100644 --- a/include/linux/mbus.h +++ b/include/linux/mbus.h @@ -61,6 +61,7 @@ static inline const struct mbus_dram_target_info *mv_mbus_dram_info(void) } #endif +int mvebu_mbus_save_cpu_target(u32 *store_addr); void mvebu_mbus_get_pcie_mem_aperture(struct resource *res); void mvebu_mbus_get_pcie_io_aperture(struct resource *res); int mvebu_mbus_add_window_remap_by_id(unsigned int target, |