Simon, > -----Original Message----- > From: Que, Simon > Sent: Wednesday, July 07, 2010 1:55 AM > To: linux-omap@xxxxxxxxxxxxxxx > Cc: Kanigeri, Hari; Ohad Ben-Cohen; Shilimkar, Santosh > Subject: [RFC v.4] omap: hwspinlock: Added hwspinlock driver <snip> > Created driver for OMAP hardware spinlock. This driver supports: > - Reserved spinlocks for internal use > - Dynamic allocation of unreserved locks > - Lock, unlock, and trylock functions, with or without disabling > irqs/preempt > - Registered as a platform device driver > > The device initialization uses hwmod to configure the devices. One device > will > be created for each hardware spinlock. It will pass spinlock register > addresses to the driver. The device initialization file is: > arch/arm/mach-omap2/hwspinlocks.c > > The driver takes in data passed in device initialization. The function > hwspinlock_probe() initializes the array of spinlock structures, each > containing a spinlock register address provided by the device > initialization. > The device driver file is: > arch/arm/plat-omap/hwspinlock.c > > Here's an API summary: > int hwspinlock_lock(struct hwspinlock *); > Attempt to lock a hardware spinlock. If it is busy, the function > will > keep trying until it succeeds. This is a blocking function. > int hwspinlock_trylock(struct hwspinlock *); > Attempt to lock a hardware spinlock. If it is busy, the function > will > return BUSY. If it succeeds in locking, the function will return > ACQUIRED. This is a non-blocking function > int hwspinlock_unlock(struct hwspinlock *); > Unlock a hardware spinlock. > > struct hwspinlock *hwspinlock_request(void); > Provides for "dynamic allocation" of a hardware spinlock. It > returns > the handle to the next available (unallocated) spinlock. If no more > locks are available, it returns NULL. > struct hwspinlock *hwspinlock_request_specific(unsigned int); > Provides for "static allocation" of a specific hardware spinlock. > This > allows the system to use a specific spinlock, identified by an ID. > If > the ID is invalid or if the desired lock is already allocated, this > will return NULL. Otherwise it returns a spinlock handle. > int hwspinlock_free(struct hwspinlock *); > Frees an allocated hardware spinlock (either reserved or > unreserved). The above API description also should be present in the source file. Add It on top of respective API. > > Signed-off-by: Simon Que <sque@xxxxxx> > --- > arch/arm/mach-omap2/Makefile | 2 + > arch/arm/mach-omap2/hwspinlocks.c | 71 ++++++ > arch/arm/mach-omap2/omap_hwmod_44xx_data.c | 2 +- > arch/arm/plat-omap/Makefile | 3 +- > arch/arm/plat-omap/hwspinlock.c | 295 > ++++++++++++++++++++++++++ > arch/arm/plat-omap/include/plat/hwspinlock.h | 29 +++ > arch/arm/plat-omap/include/plat/omap44xx.h | 2 + > 7 files changed, 402 insertions(+), 2 deletions(-) > create mode 100644 arch/arm/mach-omap2/hwspinlocks.c > create mode 100644 arch/arm/plat-omap/hwspinlock.c > create mode 100644 arch/arm/plat-omap/include/plat/hwspinlock.h > Apart from the documentation comments, patch looks good to me. Regards, Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
