From mboxrd@z Thu Jan 1 00:00:00 1970 From: Francesco VIRLINZI Date: Wed, 11 Mar 2009 10:39:02 +0000 Subject: [Proposal][PATCH] sh: PMB hibernation support Message-Id: <49B794C6.8000806@st.com> MIME-Version: 1 Content-Type: multipart/mixed; boundary="------------030709090901050105030308" List-Id: To: linux-sh@vger.kernel.org This is a multi-part message in MIME format. --------------030709090901050105030308 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Paul > > Feel free to post what you already have, even if it doesn't apply. This > sort of stuff by nature tends to take several iterations before it's in > any shape to merge anyways. > > In attach there is a proposal on how manage the PMB after a resume from hibernation. My assumption in background is that "just because the kernel runs.. the "core" PMB (main memory) are already ok" In our kernel I'm doing something very similar. I can say: it compiles but I have no way to really test this code as it is. Regards Francesco --------------030709090901050105030308 Content-Type: text/x-patch; name="0004-sh_mmu-Added-hibernation-support-in-the-PMB.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename*0="0004-sh_mmu-Added-hibernation-support-in-the-PMB.patch" >From f7ac0e9ecd48c8987a747968a79a94ac3f424adc Mon Sep 17 00:00:00 2001 From: Francesco Virlinzi Date: Wed, 11 Mar 2009 11:31:52 +0100 Subject: [PATCH] sh_mmu: Added hibernation support in the PMB Signed-off-by: Francesco Virlinzi --- arch/sh/mm/pmb.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 files changed, 38 insertions(+), 0 deletions(-) diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c index 8424167..b1a714a 100644 --- a/arch/sh/mm/pmb.c +++ b/arch/sh/mm/pmb.c @@ -15,6 +15,8 @@ */ #include #include +#include +#include #include #include #include @@ -402,3 +404,39 @@ static int __init pmb_debugfs_init(void) return 0; } postcore_initcall(pmb_debugfs_init); + +#ifdef CONFIG_PM +static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state) +{ + static pm_message_t prev_state; + + /* Restore the PMB after a resume from hibernation */ + if (state.event == PM_EVENT_ON && + prev_state.event == PM_EVENT_FREEZE) { + struct pmb_entry *pmbe; + spin_lock_irq(&pmb_list_lock); + for (pmbe = pmb_list; pmbe; pmbe = pmbe->next) + set_pmb_entry(pmbe); + spin_unlock_irq(&pmb_list_lock); + } + prev_state = state; + return 0; +} + +static int pmb_sysdev_resume(struct sys_device *dev) +{ + return pmb_sysdev_suspend(dev, PMSG_ON); +} + +static struct sysdev_driver pmb_sysdev_driver = { + .suspend = pmb_sysdev_suspend, + .resume = pmb_sysdev_resume, +}; + +static int __init pmb_sysdev_init(void) +{ + return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver); +} + +subsys_initcall(pmb_sysdev_init); +#endif -- 1.5.6.6 --------------030709090901050105030308--