159 lines
4.8 KiB
C
159 lines
4.8 KiB
C
/****************************************************************************
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* arch/xtensa/src/common/xtensa_cpenable.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/irq.h>
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#include <nuttx/sched.h>
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#include <arch/xtensa/xtensa_coproc.h>
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#include <arch/chip/core-isa.h>
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#include "xtensa.h"
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#if XCHAL_CP_NUM > 0
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: xtensa_coproc_enable
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*
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* Description:
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* Enable a set of co-processors.
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*
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* Input Parameters:
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* cpstate - A pointer to the Co-processor state save structure.
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* cpset - A bit set of co-processors to be enabled. Matches bit layout
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* of the CPENABLE register. Bit 0-XCHAL_CP_NUM: 0 = no change
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* 1 = enable
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void xtensa_coproc_enable(struct xtensa_cpstate_s *cpstate, int cpset)
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{
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irqstate_t flags;
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uint32_t cpenable;
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/* These operations must be atomic */
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flags = enter_critical_section();
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/* Don't enable co-processors that may already be enabled
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*
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* cpenable
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* 0 1
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* --- ---
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* cpset 0 | 0 0
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* 1 | 1 0
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*/
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cpset ^= (cpset & cpstate->cpenable);
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if (cpset != 0)
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{
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/* Enable the co-processors */
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cpenable = xtensa_get_cpenable();
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cpenable |= cpset;
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xtensa_set_cpenable(cpenable);
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cpstate->cpenable = cpenable;
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cpstate->cpstored &= ~cpset;
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}
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leave_critical_section(flags);
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}
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/****************************************************************************
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* Name: xtensa_coproc_disable
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*
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* Description:
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* Enable a set of co-processors.
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*
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* Input Parameters:
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* cpstate - A pointer to the Co-processor state save structure.
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* cpset - A bit set of co-processors to be enabled. Matches bit layout
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* of the CPENABLE register. Bit 0-XCHAL_CP_NUM: 0 = no change
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* 1 = disable
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void xtensa_coproc_disable(struct xtensa_cpstate_s *cpstate, int cpset)
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{
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irqstate_t flags;
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uint32_t cpenable;
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/* These operations must be atomic */
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flags = enter_critical_section();
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/* Don't disable co-processors that are already be disabled.
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*
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* cpenable
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* 0 1
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* --- ---
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* cpset 0 | 0 0
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* 1 | 0 1
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*/
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cpset &= cpstate->cpenable;
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if (cpset != 0)
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{
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/* Disable the co-processors */
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cpenable = xtensa_get_cpenable();
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cpenable &= ~cpset;
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xtensa_set_cpenable(cpenable);
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cpstate->cpenable = cpenable;
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cpstate->cpstored &= ~cpset;
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}
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leave_critical_section(flags);
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}
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#endif /* XCHAL_CP_NUM */
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