diff options
| -rw-r--r-- | arch/arm/vfp/vfp.h | 2 | ||||
| -rw-r--r-- | arch/arm/vfp/vfphw.S | 2 | ||||
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 56 |
3 files changed, 58 insertions, 2 deletions
diff --git a/arch/arm/vfp/vfp.h b/arch/arm/vfp/vfp.h index c85860bad58..8de86e4fead 100644 --- a/arch/arm/vfp/vfp.h +++ b/arch/arm/vfp/vfp.h @@ -377,6 +377,6 @@ struct op { u32 flags; }; -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) || defined(CONFIG_PM) extern void vfp_save_state(void *location, u32 fpexc); #endif diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index 3c73aafe3e0..c92a08bd6a8 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -172,7 +172,7 @@ process_exception: @ retry the faulted instruction ENDPROC(vfp_support_entry) -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) || defined(CONFIG_PM) ENTRY(vfp_save_state) @ Save the current VFP state @ r0 - save location diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 67ca340a7c8..9f476a1be2c 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -322,6 +322,61 @@ static void vfp_enable(void *unused) set_copro_access(access | CPACC_FULL(10) | CPACC_FULL(11)); } +#ifdef CONFIG_PM +#include <linux/sysdev.h> + +static int vfp_pm_suspend(struct sys_device *dev, pm_message_t state) +{ + struct thread_info *ti = current_thread_info(); + u32 fpexc = fmrx(FPEXC); + + /* if vfp is on, then save state for resumption */ + if (fpexc & FPEXC_EN) { + printk(KERN_DEBUG "%s: saving vfp state\n", __func__); + vfp_save_state(&ti->vfpstate, fpexc); + + /* disable, just in case */ + fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN); + } + + /* clear any information we had about last context state */ + memset(last_VFP_context, 0, sizeof(last_VFP_context)); + + return 0; +} + +static int vfp_pm_resume(struct sys_device *dev) +{ + /* ensure we have access to the vfp */ + vfp_enable(NULL); + + /* and disable it to ensure the next usage restores the state */ + fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN); + + return 0; +} + +static struct sysdev_class vfp_pm_sysclass = { + .name = "vfp", + .suspend = vfp_pm_suspend, + .resume = vfp_pm_resume, +}; + +static struct sys_device vfp_pm_sysdev = { + .cls = &vfp_pm_sysclass, +}; + +static void vfp_pm_init(void) +{ + sysdev_class_register(&vfp_pm_sysclass); + sysdev_register(&vfp_pm_sysdev); +} + + +#else +static inline void vfp_pm_init(void) { } +#endif /* CONFIG_PM */ + #include <linux/smp.h> /* @@ -365,6 +420,7 @@ static int __init vfp_init(void) vfp_vector = vfp_support_entry; thread_register_notifier(&vfp_notifier_block); + vfp_pm_init(); /* * We detected VFP, and the support code is |