Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752183Ab0GYVKM (ORCPT ); Sun, 25 Jul 2010 17:10:12 -0400 Received: from filtteri5.pp.htv.fi ([213.243.153.188]:40905 "EHLO filtteri5.pp.htv.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751038Ab0GYVKK (ORCPT ); Sun, 25 Jul 2010 17:10:10 -0400 From: Alexander Shishkin To: Hari Kanigeri Cc: Alexander Shishkin , linux-arm-kernel@lists.infradead.org, Tony Lindgren , Russell King , Paul Walmsley , Kevin Hilman , linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] omap3: make coresight register save across OFF modes a sysfs option Date: Mon, 26 Jul 2010 00:04:23 +0300 Message-Id: <1280091863-8891-1-git-send-email-virtuoso@slind.org> X-Mailer: git-send-email 1.7.1 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4469 Lines: 143 This adds a sysfs file at /sys/power/coresight_save which is used to control if the ETM and debug components' states should be saved and restored across OFF modes. Signed-off-by: Alexander Shishkin Cc: Tony Lindgren Cc: Russell King Cc: Paul Walmsley Cc: Kevin Hilman Cc: linux-omap@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org --- arch/arm/mach-omap2/Makefile | 1 + arch/arm/mach-omap2/debug34xx.c | 66 +++++++++++++++++++++++++++++++++++++++ arch/arm/mach-omap2/pm.h | 6 +++ arch/arm/mach-omap2/pm34xx.c | 3 ++ 4 files changed, 76 insertions(+), 0 deletions(-) create mode 100644 arch/arm/mach-omap2/debug34xx.c diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile index f5b4ff4..3a64ce4 100644 --- a/arch/arm/mach-omap2/Makefile +++ b/arch/arm/mach-omap2/Makefile @@ -49,6 +49,7 @@ ifeq ($(CONFIG_PM),y) obj-$(CONFIG_ARCH_OMAP2) += pm24xx.o obj-$(CONFIG_ARCH_OMAP2) += sleep24xx.o obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o cpuidle34xx.o +obj-$(CONFIG_ENABLE_OFF_MODE_JTAG_ETM_DEBUG) += debug34xx.o obj-$(CONFIG_PM_DEBUG) += pm-debug.o AFLAGS_sleep24xx.o :=-Wa,-march=armv6 diff --git a/arch/arm/mach-omap2/debug34xx.c b/arch/arm/mach-omap2/debug34xx.c new file mode 100644 index 0000000..698e83a --- /dev/null +++ b/arch/arm/mach-omap2/debug34xx.c @@ -0,0 +1,66 @@ +/* + * Control saving and restoring of coresight components' state during + * OFF mode. + * + * Copyright (C) 2010 Nokia Corporation + * Alexander Shishkin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include + +#include "pm.h" + +/* + * Pointer to a place in sram where the ETM/debug state save + * flag is. It can be calculated after the omap_sram_idle is + * pushed to sram. + */ +static unsigned int *_etm_save; + +/* + * sysfs file /sys/power/coresight_save controls whether the + * state of coresight components should be saved and restored + * across OFF modes. + */ +static ssize_t coresight_save_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%u\n", *_etm_save); +} + +static ssize_t coresight_save_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned int value; + + if (sscanf(buf, "%u", &value) != 1) + return -EINVAL; + + *_etm_save = !!value; + + return n; +} + +static struct kobj_attribute coresight_save_attr = + __ATTR(coresight_save, 0644, coresight_save_show, coresight_save_store); + +int omap3_coresight_pm_init(void *sram_addr) +{ + int ret; + + /* the last word from the top of omap_sram_idle */ + _etm_save = (unsigned *)((u8 *)sram_addr + omap34xx_cpu_suspend_sz - 4); + + ret = sysfs_create_file(power_kobj, &coresight_save_attr.attr); + + return ret; +} + diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h index 3de6ece..0321834 100644 --- a/arch/arm/mach-omap2/pm.h +++ b/arch/arm/mach-omap2/pm.h @@ -76,6 +76,12 @@ extern void omap34xx_cpu_suspend(u32 *addr, int save_state); extern void save_secure_ram_context(u32 *addr); extern void omap3_save_scratchpad_contents(void); +#ifdef CONFIG_ENABLE_OFF_MODE_JTAG_ETM_DEBUG +int omap3_coresight_pm_init(void *sram_addr); +#else +#define omap3_coresight_pm_init(x) do {} while (0) +#endif + extern unsigned int omap24xx_idle_loop_suspend_sz; extern unsigned int omap34xx_suspend_sz; extern unsigned int save_secure_ram_context_sz; diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index fb4994a..c389e65 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -1096,6 +1096,9 @@ static int __init omap3_pm_init(void) core_clkdm = clkdm_lookup("core_clkdm"); omap_push_sram_idle(); + + omap3_coresight_pm_init(_omap_sram_idle); + #ifdef CONFIG_SUSPEND suspend_set_ops(&omap_pm_ops); #endif /* CONFIG_SUSPEND */ -- 1.7.1 -- 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/