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x86, mrst: Some drivers need to known when an SCU is available

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Add a notifier so that drivers can hook into SCU availability in order to
take actions post initialisation when/if the SCU becomes available.

In the ideal world we wouldn't need this and we could avoid any init
dependancies of this form, but in practice we can't do it for some cases.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Alan Cox 2011-09-07 16:06:51 +03:00 committed by Samuel Ortiz
parent 1f5a371c07
commit 42c2544b2d
2 changed files with 29 additions and 0 deletions
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22
arch/x86/include/asm/intel_scu_ipc.h
View file

@ -1,6 +1,8 @@
#ifndef _ASM_X86_INTEL_SCU_IPC_H_
#define _ASM_X86_INTEL_SCU_IPC_H_
#include <linux/notifier.h>
#define IPCMSG_VRTC 0xFA /* Set vRTC device */
/* Command id associated with message IPCMSG_VRTC */
@ -44,4 +46,24 @@ int intel_scu_ipc_i2c_cntrl(u32 addr, u32 *data);
/* Update FW version */
int intel_scu_ipc_fw_update(u8 *buffer, u32 length);
extern struct blocking_notifier_head intel_scu_notifier;
static inline void intel_scu_notifier_add(struct notifier_block *nb)
{
blocking_notifier_chain_register(&intel_scu_notifier, nb);
}
static inline void intel_scu_notifier_remove(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&intel_scu_notifier, nb);
}
static inline int intel_scu_notifier_post(unsigned long v, void *p)
{
return blocking_notifier_call_chain(&intel_scu_notifier, v, p);
}
#define SCU_AVAILABLE 1
#define SCU_DOWN 2
#endif

7
arch/x86/platform/mrst/mrst.c
View file

@ -24,6 +24,7 @@
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <asm/setup.h>
#include <asm/mpspec_def.h>
@ -555,6 +556,9 @@ static void __init intel_scu_i2c_device_register(int bus,
i2c_devs[i2c_next_dev++] = new_dev;
}
BLOCKING_NOTIFIER_HEAD(intel_scu_notifier);
EXPORT_SYMBOL_GPL(intel_scu_notifier);
/* Called by IPC driver */
void intel_scu_devices_create(void)
{
@ -579,6 +583,7 @@ void intel_scu_devices_create(void)
} else
i2c_register_board_info(i2c_bus[i], i2c_devs[i], 1);
}
intel_scu_notifier_post(SCU_AVAILABLE, 0L);
}
EXPORT_SYMBOL_GPL(intel_scu_devices_create);
@ -587,6 +592,8 @@ void intel_scu_devices_destroy(void)
{
int i;
intel_scu_notifier_post(SCU_DOWN, 0L);
for (i = 0; i < ipc_next_dev; i++)
platform_device_del(ipc_devs[i]);
}