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https://github.com/ARM-software/arm-trusted-firmware.git
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b127cdb879
The FVP specific code that gets called after a cpu has been physically powered on after having been turned off or suspended earlier does not clear the PWRC.PWKUPR.WEN bit. Not doing so causes problems if: a cpu is suspended, woken from suspend, powered down through a cpu_off call & receives a spurious interrupt. Since the WEN bit is not cleared after the cpu woke up from suspend, the spurious wakeup will power the cpu on. Since the cpu_off call clears the jump address in the mailbox this spurious wakeup will cause the cpu to crash. This patch fixes this issue by clearing the WEN bit whenever a cpu is powered up. Change-Id: Ic91f5dffe1ed01d76bc7fc807acf0ecd3e38ce5b
111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/*
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* Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
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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 are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <assert.h>
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#include <arch_helpers.h>
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#include <platform.h>
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#include <fvp_pwrc.h>
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#include <bakery_lock.h>
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/*
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* TODO: Someday there will be a generic power controller api. At the moment
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* each platform has its own pwrc so just exporting functions is fine.
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*/
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static bakery_lock pwrc_lock __attribute__ ((section("tzfw_coherent_mem")));
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unsigned int fvp_pwrc_get_cpu_wkr(unsigned long mpidr)
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{
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unsigned int rc = 0;
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bakery_lock_get(mpidr, &pwrc_lock);
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mmio_write_32(PWRC_BASE + PSYSR_OFF, (unsigned int) mpidr);
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rc = PSYSR_WK(mmio_read_32(PWRC_BASE + PSYSR_OFF));
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bakery_lock_release(mpidr, &pwrc_lock);
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return rc;
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}
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unsigned int fvp_pwrc_read_psysr(unsigned long mpidr)
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{
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unsigned int rc = 0;
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bakery_lock_get(mpidr, &pwrc_lock);
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mmio_write_32(PWRC_BASE + PSYSR_OFF, (unsigned int) mpidr);
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rc = mmio_read_32(PWRC_BASE + PSYSR_OFF);
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bakery_lock_release(mpidr, &pwrc_lock);
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return rc;
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}
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void fvp_pwrc_write_pponr(unsigned long mpidr)
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{
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bakery_lock_get(mpidr, &pwrc_lock);
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mmio_write_32(PWRC_BASE + PPONR_OFF, (unsigned int) mpidr);
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bakery_lock_release(mpidr, &pwrc_lock);
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}
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void fvp_pwrc_write_ppoffr(unsigned long mpidr)
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{
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bakery_lock_get(mpidr, &pwrc_lock);
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mmio_write_32(PWRC_BASE + PPOFFR_OFF, (unsigned int) mpidr);
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bakery_lock_release(mpidr, &pwrc_lock);
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}
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void fvp_pwrc_set_wen(unsigned long mpidr)
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{
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bakery_lock_get(mpidr, &pwrc_lock);
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mmio_write_32(PWRC_BASE + PWKUPR_OFF,
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(unsigned int) (PWKUPR_WEN | mpidr));
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bakery_lock_release(mpidr, &pwrc_lock);
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}
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void fvp_pwrc_clr_wen(unsigned long mpidr)
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{
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bakery_lock_get(mpidr, &pwrc_lock);
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mmio_write_32(PWRC_BASE + PWKUPR_OFF,
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(unsigned int) mpidr);
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bakery_lock_release(mpidr, &pwrc_lock);
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}
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void fvp_pwrc_write_pcoffr(unsigned long mpidr)
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{
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bakery_lock_get(mpidr, &pwrc_lock);
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mmio_write_32(PWRC_BASE + PCOFFR_OFF, (unsigned int) mpidr);
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bakery_lock_release(mpidr, &pwrc_lock);
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}
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/* Nothing else to do here apart from initializing the lock */
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int fvp_pwrc_setup(void)
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{
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bakery_lock_init(&pwrc_lock);
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return 0;
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}
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