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ARM: firmware: Introduce suspend and resume operations 

This patch extends the firmware_ops structure with two new callbacks:
.suspend() and .resume(). The former is intended to ask the firmware to
save all its volatile state and suspend the system, without returning
back to the kernel in between. The latter is to be called early by
very low level platform suspend code after waking up to restore low
level hardware state, which can't be restored in non-secure mode.

While at it, outdated version of the structure is removed from the
documentation and replaced with a reference to the header file.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Tomasz Figa 2014-09-24 01:24:35 +09:00 committed by Kukjin Kim
parent 066da1ae52
commit 9c261f89a3
2 changed files with 13 additions and 23 deletions
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28
Documentation/arm/firmware.txt
View File

@ -7,32 +7,14 @@ world, which changes the way some things have to be initialized. This makes
a need to provide an interface for such platforms to specify available firmware
operations and call them when needed.
Firmware operations can be specified using struct firmware_ops
struct firmware_ops {
/*
* Enters CPU idle mode
*/
int (*do_idle)(void);
/*
* Sets boot address of specified physical CPU
*/
int (*set_cpu_boot_addr)(int cpu, unsigned long boot_addr);
/*
* Boots specified physical CPU
*/
int (*cpu_boot)(int cpu);
/*
* Initializes L2 cache
*/
int (*l2x0_init)(void);
};
and then registered with register_firmware_ops function
Firmware operations can be specified by filling in a struct firmware_ops
with appropriate callbacks and then registering it with register_firmware_ops()
function.
void register_firmware_ops(const struct firmware_ops *ops)
the ops pointer must be non-NULL.
The ops pointer must be non-NULL. More information about struct firmware_ops
and its members can be found in arch/arm/include/asm/firmware.h header.
There is a default, empty set of operations provided, so there is no need to
set anything if platform does not require firmware operations.

8
arch/arm/include/asm/firmware.h
View File

@ -41,6 +41,14 @@ struct firmware_ops {
* Initializes L2 cache
*/
int (*l2x0_init)(void);
/*
* Enter system-wide suspend.
*/
int (*suspend)(void);
/*
* Restore state of privileged hardware after system-wide suspend.
*/
int (*resume)(void);
};
/* Global pointer for current firmware_ops structure, can't be NULL. */