Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756877Ab1CRPVk (ORCPT ); Fri, 18 Mar 2011 11:21:40 -0400 Received: from ch1outboundpool.messaging.microsoft.com ([216.32.181.184]:7557 "EHLO CH1EHSOBE001.bigfish.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756817Ab1CRPVf (ORCPT ); Fri, 18 Mar 2011 11:21:35 -0400 X-SpamScore: 0 X-BigFish: VS0(zzzz1202hzz8275bh8275dhz2dh2a8h668h62h) X-Spam-TCS-SCL: 1:0 X-Forefront-Antispam-Report: KIP:(null);UIP:(null);IPVD:NLI;H:mail.freescale.net;RD:none;EFVD:NLI From: To: CC: , , , , , , , , Dinh Nguyen Subject: [PATCHv4 3/3] ARM: mx51: Add support for low power suspend on MX51 Date: Fri, 18 Mar 2011 10:21:24 -0500 Message-ID: <1300461684-21775-3-git-send-email-Dinh.Nguyen@freescale.com> X-Mailer: git-send-email 1.6.0.4 In-Reply-To: <1300461684-21775-2-git-send-email-Dinh.Nguyen@freescale.com> References: <1300461684-21775-1-git-send-email-Dinh.Nguyen@freescale.com> <1300461684-21775-2-git-send-email-Dinh.Nguyen@freescale.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: freescale.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3123 Lines: 115 From: Dinh Nguyen Adds initial low power suspend functionality to MX51. Supports "mem" and "standby" modes. Tested on mx51-babbage. Signed-off-by: Dinh Nguyen --- arch/arm/mach-mx5/Makefile | 1 + arch/arm/mach-mx5/pm-imx51.c | 74 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+), 0 deletions(-) create mode 100644 arch/arm/mach-mx5/pm-imx51.c diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile index 0b9338c..787cb80 100644 --- a/arch/arm/mach-mx5/Makefile +++ b/arch/arm/mach-mx5/Makefile @@ -6,6 +6,7 @@ obj-y := cpu.o mm.o clock-mx51-mx53.o devices.o ehci.o system.o obj-$(CONFIG_SOC_IMX50) += mm-mx50.o +obj-$(CONFIG_PM) += pm-imx51.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-imx51.c b/arch/arm/mach-mx5/pm-imx51.c new file mode 100644 index 0000000..49186e3 --- /dev/null +++ b/arch/arm/mach-mx5/pm-imx51.c @@ -0,0 +1,74 @@ +/* + * Copyright (C) 2011 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 +#include +#include +#include "crm_regs.h" + +static struct clk *gpc_dvfs_clk; + +static int mx5_suspend_enter(suspend_state_t state) +{ + if (gpc_dvfs_clk == NULL) + gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs"); + + if (gpc_dvfs_clk) { + clk_enable(gpc_dvfs_clk); + switch (state) { + case PM_SUSPEND_MEM: + mx5_cpu_lp_set(STOP_POWER_OFF); + break; + case PM_SUSPEND_STANDBY: + mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF); + break; + default: + return -EINVAL; + } + + if (state == PM_SUSPEND_MEM) { + local_flush_tlb_all(); + flush_cache_all(); + + /*clear the EMPGC0/1 bits */ + __raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR); + __raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR); + } + cpu_do_idle(); + clk_disable(gpc_dvfs_clk); + }else { + printk(KERN_ERR "Cannot enter SRPG suspend -no gpc_dvfs clock!\n"); + return -EPERM; + } + + 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); -- 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/