From mboxrd@z Thu Jan 1 00:00:00 1970 From: s.hauer@pengutronix.de (Sascha Hauer) Date: Mon, 6 Dec 2010 09:20:16 +0100 Subject: [PATCH] ARM: imx: Add support for low power suspend on MX51. In-Reply-To: <1291159899-32017-1-git-send-email-Dinh.Nguyen@freescale.com> References: <1291159899-32017-1-git-send-email-Dinh.Nguyen@freescale.com> Message-ID: <20101206082016.GU6017@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Dinh, On Tue, Nov 30, 2010 at 05:31:39PM -0600, Dinh.Nguyen at freescale.com wrote: > From: Dinh Nguyen > > Adds initial low power suspend functionality to MX51. > Supports "mem" and "standby" modes. > > Signed-off-by: Dinh Nguyen > --- > arch/arm/mach-mx5/Makefile | 1 + > arch/arm/mach-mx5/pm.c | 70 ++++++++++++++++++++++++++++++++++ > arch/arm/plat-mxc/include/mach/mxc.h | 1 + > 3 files changed, 72 insertions(+), 0 deletions(-) > create mode 100644 arch/arm/mach-mx5/pm.c > > diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile > index 026cd85..906bc71 100644 > --- a/arch/arm/mach-mx5/Makefile > +++ b/arch/arm/mach-mx5/Makefile > @@ -5,6 +5,7 @@ > # Object file lists. > obj-y := cpu.o mm.o clock-mx51-mx53.o devices.o > > +obj-$(CONFIG_PM) += pm.o > obj-$(CONFIG_CPU_FREQ_IMX) += cpu_op-mx51.o > obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o > obj-$(CONFIG_MACH_MX51_3DS) += board-mx51_3ds.o > diff --git a/arch/arm/mach-mx5/pm.c b/arch/arm/mach-mx5/pm.c > new file mode 100644 > index 0000000..417cce1 > --- /dev/null > +++ b/arch/arm/mach-mx5/pm.c > @@ -0,0 +1,70 @@ > +/* > + * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved. > + * > + * The code contained herein is licensed under the GNU General Public > + * License. You may obtain a copy of the GNU General Public License > + * Version 2 or later at the following locations: > + * > + * http://www.opensource.org/licenses/gpl-license.html > + * http://www.gnu.org/copyleft/gpl.html > + */ > +#include > +#include > +#include > +#include "crm_regs.h" > + > +static int mx5_suspend_enter(suspend_state_t state) > +{ > + u32 plat_lpc, arm_srpgcr, ccm_clpcr; plat_lpc and arm_srpgcr are used unitialized. Sascha > + > + /* always allow platform to issue a deep sleep mode request */ > + ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) & ~(MXC_CCM_CLPCR_LPM_MASK); > + > + switch (state) { > + case PM_SUSPEND_MEM: > + ccm_clpcr |= (0x2 << MXC_CCM_CLPCR_LPM_OFFSET); > + ccm_clpcr |= (0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET); > + ccm_clpcr |= MXC_CCM_CLPCR_VSTBY; > + ccm_clpcr |= MXC_CCM_CLPCR_SBYOS; > + break; > + case PM_SUSPEND_STANDBY: > + ccm_clpcr |= (0x1 << MXC_CCM_CLPCR_LPM_OFFSET); > + ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY; > + ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS; > + break; > + default: > + return -EINVAL; > + } > + > + plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM > + | MXC_CORTEXA8_PLAT_LPC_DBG_DSM; > + arm_srpgcr |= MXC_SRPGCR_PCR; > + > + __raw_writel(plat_lpc, MXC_CORTEXA8_PLAT_LPC); > + __raw_writel(arm_srpgcr, MXC_SRPG_ARM_SRPGCR); > + __raw_writel(ccm_clpcr, MXC_CCM_CLPCR); > + > + if (tzic_enable_wake(0) != 0) > + return -EAGAIN; > + > + cpu_do_idle(); > + return 0; > +} > + > +static int mx5_pm_valid(suspend_state_t state) > +{ > + return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX); > +} > + > +static const struct platform_suspend_ops mx5_suspend_ops = { > + .valid = mx5_pm_valid, > + .enter = mx5_suspend_enter, > +}; > + > +static int __init mx5_pm_init(void) > +{ > + if (cpu_is_mx51()) > + suspend_set_ops(&mx5_suspend_ops); > + return 0; > +} > +device_initcall(mx5_pm_init); > diff --git a/arch/arm/plat-mxc/include/mach/mxc.h b/arch/arm/plat-mxc/include/mach/mxc.h > index 4abbdd1..dc685d4 100644 > --- a/arch/arm/plat-mxc/include/mach/mxc.h > +++ b/arch/arm/plat-mxc/include/mach/mxc.h > @@ -52,6 +52,7 @@ > > #ifndef __ASSEMBLY__ > extern unsigned int __mxc_cpu_type; > +int tzic_enable_wake(int is_idle); > #endif > > #ifdef CONFIG_ARCH_MX1 > -- > 1.6.0.4 > > > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |