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authorTomasz Figa <t.figa@samsung.com>2014-09-24 01:24:35 +0900
committerKukjin Kim <kgene.kim@samsung.com>2014-10-21 00:06:35 +0900
commit9c261f89a30010a33c15e6b7cfc7c79ae6bea653 (patch)
tree2dd65568bd088e9e77a88f10d040badaa73a26d4
parent066da1ae52c30ae7e2792dbbb0d6bcbba493245e (diff)
downloadlinux-9c261f89a30010a33c15e6b7cfc7c79ae6bea653.tar.bz2
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 While at it, outdated version of the structure is removed from the documentation and replaced with a reference to the header file.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>
-rw-r--r--Documentation/arm/firmware.txt28
-rw-r--r--arch/arm/include/asm/firmware.h8
2 files changed, 13 insertions, 23 deletions
diff --git a/Documentation/arm/firmware.txt b/Documentation/arm/firmware.txt
index c2e468fe7b0b..da6713adac8a 100644
--- a/Documentation/arm/firmware.txt
+++ b/Documentation/arm/firmware.txt
@@ -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.
diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
index 2c9f10df7568..5904f59b0409 100644
--- a/arch/arm/include/asm/firmware.h
+++ b/arch/arm/include/asm/firmware.h
@@ -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. */