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/***********************license start***************
 * Author: Cavium Networks
 *
 * Contact: support@caviumnetworks.com
 * This file is part of the OCTEON SDK
 *
 * Copyright (c) 2003-2008 Cavium Networks
 *
 * This file is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, Version 2, as
 * published by the Free Software Foundation.
 *
 * This file is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this file; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * or visit http://www.gnu.org/licenses/.
 *
 * This file may also be available under a different license from Cavium.
 * Contact Cavium Networks for more information
 ***********************license end**************************************/

/**
 * Implementation of spinlocks for Octeon CVMX.	 Although similar in
 * function to Linux kernel spinlocks, they are not compatible.
 * Octeon CVMX spinlocks are only used to synchronize with the boot
 * monitor and other non-Linux programs running in the system.
 */

#ifndef __CVMX_SPINLOCK_H__
#define __CVMX_SPINLOCK_H__

#include <asm/octeon/cvmx-asm.h>

/* Spinlocks for Octeon */

/* define these to enable recursive spinlock debugging */
/*#define CVMX_SPINLOCK_DEBUG */

/**
 * Spinlocks for Octeon CVMX
 */
typedef struct {
	volatile uint32_t value;
} cvmx_spinlock_t;

/* note - macros not expanded in inline ASM, so values hardcoded */
#define	 CVMX_SPINLOCK_UNLOCKED_VAL  0
#define	 CVMX_SPINLOCK_LOCKED_VAL    1

#define CVMX_SPINLOCK_UNLOCKED_INITIALIZER  {CVMX_SPINLOCK_UNLOCKED_VAL}

/**
 * Initialize a spinlock
 *
 * @lock:   Lock to initialize
 */
static inline void cvmx_spinlock_init(cvmx_spinlock_t *lock)
{
	lock->value = CVMX_SPINLOCK_UNLOCKED_VAL;
}

/**
 * Return non-zero if the spinlock is currently locked
 *
 * @lock:   Lock to check
 * Returns Non-zero if locked
 */
static inline int cvmx_spinlock_locked(cvmx_spinlock_t *lock)
{
	return lock->value != CVMX_SPINLOCK_UNLOCKED_VAL;
}

/**
 * Releases lock
 *
 * @lock:   pointer to lock structure
 */
static inline void cvmx_spinlock_unlock(cvmx_spinlock_t *lock)
{
	CVMX_SYNCWS;
	lock->value = 0;
	CVMX_SYNCWS;
}

/**
 * Attempts to take the lock, but does not spin if lock is not available.
 * May take some time to acquire the lock even if it is available
 * due to the ll/sc not succeeding.
 *
 * @lock:   pointer to lock structure
 *
 * Returns 0: lock successfully taken
 *	   1: lock not taken, held by someone else
 * These return values match the Linux semantics.
 */

static inline unsigned int cvmx_spinlock_trylock(cvmx_spinlock_t *lock)
{
	unsigned int tmp;

	__asm__ __volatile__(".set noreorder	     \n"
			     "1: ll   %[tmp], %[val] \n"
			/* if lock held, fail immediately */
			     "	 bnez %[tmp], 2f     \n"
			     "	 li   %[tmp], 1	     \n"
			     "	 sc   %[tmp], %[val] \n"
			     "	 beqz %[tmp], 1b     \n"
			     "	 li   %[tmp], 0	     \n"
			     "2:		     \n"
			     ".set reorder	     \n" :
			[val] "+m"(lock->value), [tmp] "=&r"(tmp)
			     : : "memory");

	return tmp != 0;		/* normalize to 0 or 1 */
}

/**
 * Gets lock, spins until lock is taken
 *
 * @lock:   pointer to lock structure
 */
static inline void cvmx_spinlock_lock(cvmx_spinlock_t *lock)
{
	unsigned int tmp;

	__asm__ __volatile__(".set noreorder	     \n"
			     "1: ll   %[tmp], %[val]  \n"
			     "	 bnez %[tmp], 1b     \n"
			     "	 li   %[tmp], 1	     \n"
			     "	 sc   %[tmp], %[val] \n"
			     "	 beqz %[tmp], 1b     \n"
			     "	 nop		    \n"
			     ".set reorder	     \n" :
			[val] "+m"(lock->value), [tmp] "=&r"(tmp)
			: : "memory");

}

/** ********************************************************************
 * Bit spinlocks
 * These spinlocks use a single bit (bit 31) of a 32 bit word for locking.
 * The rest of the bits in the word are left undisturbed.  This enables more
 * compact data structures as only 1 bit is consumed for the lock.
 *
 */

/**
 * Gets lock, spins until lock is taken
 * Preserves the low 31 bits of the 32 bit
 * word used for the lock.
 *
 *
 * @word:  word to lock bit 31 of
 */
static inline void cvmx_spinlock_bit_lock(uint32_t *word)
{
	unsigned int tmp;
	unsigned int sav;

	__asm__ __volatile__(".set noreorder	     \n"
			     ".set noat		     \n"
			     "1: ll    %[tmp], %[val]  \n"
			     "	 bbit1 %[tmp], 31, 1b	 \n"
			     "	 li    $at, 1	   \n"
			     "	 ins   %[tmp], $at, 31, 1  \n"
			     "	 sc    %[tmp], %[val] \n"
			     "	 beqz  %[tmp], 1b     \n"
			     "	 nop		    \n"
			     ".set at		   \n"
			     ".set reorder	     \n" :
			[val] "+m"(*word), [tmp] "=&r"(tmp), [sav] "=&r"(sav)
			     : : "memory");

}

/**
 * Attempts to get lock, returns immediately with success/failure
 * Preserves the low 31 bits of the 32 bit
 * word used for the lock.
 *
 *
 * @word:  word to lock bit 31 of
 * Returns 0: lock successfully taken
 *	   1: lock not taken, held by someone else
 * These return values match the Linux semantics.
 */
static inline unsigned int cvmx_spinlock_bit_trylock(uint32_t *word)
{
	unsigned int tmp;

	__asm__ __volatile__(".set noreorder\n\t"
			     ".set noat\n"
			     "1: ll    %[tmp], %[val] \n"
			/* if lock held, fail immediately */
			     "	 bbit1 %[tmp], 31, 2f	  \n"
			     "	 li    $at, 1	   \n"
			     "	 ins   %[tmp], $at, 31, 1  \n"
			     "	 sc    %[tmp], %[val] \n"
			     "	 beqz  %[tmp], 1b     \n"
			     "	 li    %[tmp], 0      \n"
			     "2:		     \n"
			     ".set at		   \n"
			     ".set reorder	     \n" :
			[val] "+m"(*word), [tmp] "=&r"(tmp)
			: : "memory");

	return tmp != 0;		/* normalize to 0 or 1 */
}

/**
 * Releases bit lock
 *
 * Unconditionally clears bit 31 of the lock word.  Note that this is
 * done non-atomically, as this implementation assumes that the rest
 * of the bits in the word are protected by the lock.
 *
 * @word:  word to unlock bit 31 in
 */
static inline void cvmx_spinlock_bit_unlock(uint32_t *word)
{
	CVMX_SYNCWS;
	*word &= ~(1UL << 31);
	CVMX_SYNCWS;
}

#endif /* __CVMX_SPINLOCK_H__ */

Filemanager

Name Type Size Permission Actions
cvmx-address.h File 9.15 KB 0644
cvmx-agl-defs.h File 70.87 KB 0644
cvmx-asm.h File 5.08 KB 0644
cvmx-asxx-defs.h File 17.73 KB 0644
cvmx-boot-vector.h File 1.57 KB 0644
cvmx-bootinfo.h File 13.44 KB 0644
cvmx-bootmem.h File 14.02 KB 0644
cvmx-ciu-defs.h File 214.08 KB 0644
cvmx-ciu2-defs.h File 173.44 KB 0644
cvmx-ciu3-defs.h File 10.71 KB 0644
cvmx-cmd-queue.h File 18.46 KB 0644
cvmx-config.h File 6.31 KB 0644
cvmx-coremask.h File 2.13 KB 0644
cvmx-dbg-defs.h File 2.73 KB 0644
cvmx-dpi-defs.h File 27 KB 0644
cvmx-fau.h File 18.21 KB 0644
cvmx-fpa-defs.h File 37.39 KB 0644
cvmx-fpa.h File 8.14 KB 0644
cvmx-gmxx-defs.h File 226.41 KB 0644
cvmx-gpio-defs.h File 13.3 KB 0644
cvmx-helper-board.h File 4.91 KB 0644
cvmx-helper-errata.h File 1.25 KB 0644
cvmx-helper-jtag.h File 1.49 KB 0644
cvmx-helper-loop.h File 1.93 KB 0644
cvmx-helper-npi.h File 1.91 KB 0644
cvmx-helper-rgmii.h File 3.45 KB 0644
cvmx-helper-sgmii.h File 3.3 KB 0644
cvmx-helper-spi.h File 2.71 KB 0644
cvmx-helper-util.h File 5.92 KB 0644
cvmx-helper-xaui.h File 3.29 KB 0644
cvmx-helper.h File 7 KB 0644
cvmx-iob-defs.h File 35.77 KB 0644
cvmx-ipd-defs.h File 56.09 KB 0644
cvmx-ipd.h File 10.45 KB 0644
cvmx-l2c-defs.h File 7.94 KB 0644
cvmx-l2c.h File 11.13 KB 0644
cvmx-l2d-defs.h File 1.9 KB 0644
cvmx-l2t-defs.h File 5.18 KB 0644
cvmx-led-defs.h File 7.7 KB 0644
cvmx-lmcx-defs.h File 88.35 KB 0644
cvmx-mio-defs.h File 141.79 KB 0644
cvmx-mixx-defs.h File 14.58 KB 0644
cvmx-npei-defs.h File 94.93 KB 0644
cvmx-npi-defs.h File 67.92 KB 0644
cvmx-packet.h File 2.07 KB 0644
cvmx-pci-defs.h File 56.08 KB 0644
cvmx-pciercx-defs.h File 11.23 KB 0644
cvmx-pcsx-defs.h File 33.81 KB 0644
cvmx-pcsxx-defs.h File 25.23 KB 0644
cvmx-pemx-defs.h File 20.62 KB 0644
cvmx-pescx-defs.h File 15.88 KB 0644
cvmx-pexp-defs.h File 16.64 KB 0644
cvmx-pip-defs.h File 87.19 KB 0644
cvmx-pip.h File 16.01 KB 0644
cvmx-pko-defs.h File 73.09 KB 0644
cvmx-pko.h File 19.17 KB 0644
cvmx-pow-defs.h File 33.51 KB 0644
cvmx-pow.h File 63.82 KB 0644
cvmx-rnm-defs.h File 6.03 KB 0644
cvmx-rst-defs.h File 7.27 KB 0644
cvmx-scratch.h File 3.78 KB 0644
cvmx-sli-defs.h File 3.95 KB 0644
cvmx-smix-defs.h File 11.01 KB 0644
cvmx-spi.h File 8.93 KB 0644
cvmx-spinlock.h File 6.24 KB 0644
cvmx-spxx-defs.h File 12.86 KB 0644
cvmx-sriox-defs.h File 42.13 KB 0644
cvmx-srxx-defs.h File 4.49 KB 0644
cvmx-stxx-defs.h File 10.42 KB 0644
cvmx-sysinfo.h File 3.95 KB 0644
cvmx-uctlx-defs.h File 12.78 KB 0644
cvmx-wqe.h File 17.06 KB 0644
cvmx.h File 13.85 KB 0644
octeon-feature.h File 6.38 KB 0644
octeon-model.h File 16.49 KB 0644
octeon.h File 12.26 KB 0644
pci-octeon.h File 1.65 KB 0644