From patchwork Tue Aug 26 14:10:25 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Figa X-Patchwork-Id: 4782131 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A8A08C0338 for ; Tue, 26 Aug 2014 14:13:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 60EF22012D for ; Tue, 26 Aug 2014 14:13:11 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C89DA20127 for ; Tue, 26 Aug 2014 14:13:09 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XMHT4-0005f4-S6; Tue, 26 Aug 2014 14:11:26 +0000 Received: from mailout3.w1.samsung.com ([210.118.77.13]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XMHSl-0005J6-P7 for linux-arm-kernel@lists.infradead.org; Tue, 26 Aug 2014 14:11:08 +0000 Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NAX0036M3IMLW70@mailout3.w1.samsung.com> for linux-arm-kernel@lists.infradead.org; Tue, 26 Aug 2014 15:13:35 +0100 (BST) X-AuditID: cbfec7f4-b7f156d0000063c7-33-53fc95638e97 Received: from eusync3.samsung.com ( [203.254.199.213]) by eucpsbgm1.samsung.com (EUCPMTA) with SMTP id 2E.1E.25543.3659CF35; Tue, 26 Aug 2014 15:10:43 +0100 (BST) Received: from AMDC1227.digital.local ([106.116.147.199]) by eusync3.samsung.com (Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPA id <0NAX00I7I3DQO020@eusync3.samsung.com>; Tue, 26 Aug 2014 15:10:43 +0100 (BST) From: Tomasz Figa To: linux-samsung-soc@vger.kernel.org Subject: [PATCH v3 2/5] ARM: EXYNOS: Add support for firmware-assisted suspend/resume Date: Tue, 26 Aug 2014 16:10:25 +0200 Message-id: <1409062228-14690-3-git-send-email-t.figa@samsung.com> X-Mailer: git-send-email 2.0.4 In-reply-to: <1409062228-14690-1-git-send-email-t.figa@samsung.com> References: <1409062228-14690-1-git-send-email-t.figa@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrLLMWRmVeSWpSXmKPExsVy+t/xq7rJU/8EGzy4ZmDx/eEpVou/k46x Wzya/5jZonfBVTaLTY+vsVpc3jWHzWLG+X1MFrcv81qsPXKX3eLU9c9sFjemt7BarJ/xmsVi 1a4/jBaXG80c+DxamnvYPH7/msToseh7lsfOWXfZPTYvqfe4cqKJ1aO3+R2bR9+WVYweR/+y eXzeJBfAFcVlk5Kak1mWWqRvl8CV8Wd9N3PBCbOKN+9WsDUwntDtYuTkkBAwkXiw9zALhC0m ceHeerYuRi4OIYGljBKLt+1hhnD6mCTOdD5hBaliE1CT+NzwiA3EFhFQlfjctoAdpIhZYCOz xI+/E9hBEsIC4RLL7+9kArFZgIoOnn4H1MzBwSvgJPHivQXENjmJVRv3gZVwCjhL/HyyFWy+ EFDJ3oerWScw8i5gZFjFKJpamlxQnJSea6hXnJhbXJqXrpecn7uJERLEX3YwLj5mdYhRgINR iYf3Q8nvYCHWxLLiytxDjBIczEoivD+S/gQL8aYkVlalFuXHF5XmpBYfYmTi4JRqYFxonm/F uzx8yr7PapqGa5/2pywwCHbu2DPLR/CGwpLyczt1JOXu80ad3TQl8F61F+eefH+2luDvf/pY uvwEvM2N7RJ2HZTflPhrejCv3MXDn1YXFwVbrlb5p8J4Q3wSi1bzV7epL1ZxNZa9c38SO/ey YqVY9bETHkuPTzn6orjjRneRYVRoqRJLcUaioRZzUXEiACVqZ4VAAgAA X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140826_071107_959471_AE4A5839 X-CRM114-Status: GOOD ( 16.96 ) X-Spam-Score: -5.0 (-----) Cc: Kukjin Kim , Russell King - ARM Linux , Arnd Bergmann , Tomasz Figa , linux-kernel@vger.kernel.org, Tomasz Figa , acourbot@nvidia.com, tomeu@tomeuvizoso.net, Olof Johansson , swarren@nvidia.com, drake@endlessm.com, linux-arm-kernel@lists.infradead.org, Marek Szyprowski X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On a numer of Exynos-based boards Linux kernel is running in non-secure mode under a secure firmware. This means that certain operations need to be handled in special way, with firmware assistance. System-wide suspend/resume is an example of such operations. This patch adds support for firmware-assisted suspend/resume by leveraging recently introduced suspend and resume firmware operations and modifying existing suspend/resume paths to account for presence of secure firmware. Signed-off-by: Tomasz Figa --- arch/arm/mach-exynos/Makefile | 1 + arch/arm/mach-exynos/common.h | 4 ++++ arch/arm/mach-exynos/firmware.c | 45 +++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-exynos/pm.c | 16 ++++++++++----- arch/arm/mach-exynos/sleep.S | 28 +++++++++++++++++++++++++ arch/arm/mach-exynos/smc.h | 4 ++++ 6 files changed, 93 insertions(+), 5 deletions(-) diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile index 788f26d..e7d1774 100644 --- a/arch/arm/mach-exynos/Makefile +++ b/arch/arm/mach-exynos/Makefile @@ -26,6 +26,7 @@ CFLAGS_hotplug.o += -march=armv7-a plus_sec := $(call as-instr,.arch_extension sec,+sec) AFLAGS_exynos-smc.o :=-Wa,-march=armv7-a$(plus_sec) +AFLAGS_sleep.o :=-Wa,-march=armv7-a$(plus_sec) obj-$(CONFIG_EXYNOS5420_MCPM) += mcpm-exynos.o CFLAGS_mcpm-exynos.o += -march=armv7-a diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h index 47b904b..c218200 100644 --- a/arch/arm/mach-exynos/common.h +++ b/arch/arm/mach-exynos/common.h @@ -111,6 +111,9 @@ IS_SAMSUNG_CPU(exynos5800, EXYNOS5800_SOC_ID, EXYNOS5_SOC_MASK) #define soc_is_exynos5() (soc_is_exynos5250() || soc_is_exynos5410() || \ soc_is_exynos5420() || soc_is_exynos5800()) +extern u32 cp15_save_diag; +extern u32 cp15_save_power; + extern void __iomem *sysram_ns_base_addr; extern void __iomem *sysram_base_addr; extern void __iomem *pmu_base_addr; @@ -127,6 +130,7 @@ static inline void exynos_pm_init(void) {} #endif extern void exynos_cpu_resume(void); +extern void exynos_cpu_resume_ns(void); extern struct smp_operations exynos_smp_ops; diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c index e8797bb..f5e626d 100644 --- a/arch/arm/mach-exynos/firmware.c +++ b/arch/arm/mach-exynos/firmware.c @@ -14,13 +14,20 @@ #include #include +#include +#include #include +#include #include #include "common.h" #include "smc.h" +#define EXYNOS_SLEEP_MAGIC 0x00000bad +#define EXYNOS_BOOT_ADDR 0x8 +#define EXYNOS_BOOT_FLAG 0xc + static int exynos_do_idle(void) { exynos_smc(SMC_CMD_SLEEP, 0, 0, 0); @@ -69,10 +76,48 @@ static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr) return 0; } +static int exynos_cpu_suspend(unsigned long arg) +{ + flush_cache_all(); + outer_flush_all(); + + exynos_smc(SMC_CMD_SLEEP, 0, 0, 0); + + pr_info("Failed to suspend the system\n"); + writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG); + return 1; +} + +static int exynos_suspend(void) +{ + if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) { + /* Save Power control and Diagnostic registers */ + asm ("mrc p15, 0, %0, c15, c0, 0\n" + "mrc p15, 0, %1, c15, c0, 1\n" + : "=r" (cp15_save_power), "=r" (cp15_save_diag) + : : "cc"); + } + + writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + EXYNOS_BOOT_FLAG); + writel(virt_to_phys(exynos_cpu_resume_ns), + sysram_ns_base_addr + EXYNOS_BOOT_ADDR); + + return cpu_suspend(0, exynos_cpu_suspend); +} + +static int exynos_resume(void) +{ + writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG); + + return 0; +} + static const struct firmware_ops exynos_firmware_ops = { .do_idle = exynos_do_idle, .set_cpu_boot_addr = exynos_set_cpu_boot_addr, .cpu_boot = exynos_cpu_boot, + .suspend = exynos_suspend, + .resume = exynos_resume, }; void __init exynos_firmware_init(void) diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c index abefacb..454c1cc 100644 --- a/arch/arm/mach-exynos/pm.c +++ b/arch/arm/mach-exynos/pm.c @@ -23,6 +23,7 @@ #include #include +#include #include #include #include @@ -292,12 +293,11 @@ static int exynos_pm_suspend(void) static void exynos_pm_resume(void) { + u32 cpuid = read_cpuid_part(); + if (exynos_pm_central_resume()) goto early_wakeup; - if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) - exynos_cpu_restore_register(); - /* For release retention */ pmu_raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION); @@ -314,9 +314,13 @@ static void exynos_pm_resume(void) s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save)); - if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) + if (cpuid == ARM_CPU_PART_CORTEX_A9) scu_enable(S5P_VA_SCU); + if (call_firmware_op(resume) == -ENOSYS + && cpuid == ARM_CPU_PART_CORTEX_A9) + exynos_cpu_restore_register(); + early_wakeup: /* Clear SLEEP mode set in INFORM1 */ @@ -357,7 +361,9 @@ static int exynos_suspend_enter(suspend_state_t state) flush_cache_all(); s3c_pm_check_store(); - ret = cpu_suspend(0, exynos_cpu_suspend); + ret = call_firmware_op(suspend); + if (ret == -ENOSYS) + ret = cpu_suspend(0, exynos_cpu_suspend); if (ret) return ret; diff --git a/arch/arm/mach-exynos/sleep.S b/arch/arm/mach-exynos/sleep.S index 108a45f..e3c3730 100644 --- a/arch/arm/mach-exynos/sleep.S +++ b/arch/arm/mach-exynos/sleep.S @@ -16,6 +16,7 @@ */ #include +#include "smc.h" #define CPU_MASK 0xff0ffff0 #define CPU_CORTEX_A9 0x410fc090 @@ -55,3 +56,30 @@ ENTRY(exynos_cpu_resume) #endif b cpu_resume ENDPROC(exynos_cpu_resume) + + .align + +ENTRY(exynos_cpu_resume_ns) + mrc p15, 0, r0, c0, c0, 0 + ldr r1, =CPU_MASK + and r0, r0, r1 + ldr r1, =CPU_CORTEX_A9 + cmp r0, r1 + bne skip_cp15 + + adr r0, cp15_save_power + ldr r1, [r0] + adr r0, cp15_save_diag + ldr r2, [r0] + mov r0, #SMC_CMD_C15RESUME + dsb + smc #0 +skip_cp15: + b cpu_resume +ENDPROC(exynos_cpu_resume_ns) + .globl cp15_save_diag +cp15_save_diag: + .long 0 @ cp15 diagnostic + .globl cp15_save_power +cp15_save_power: + .long 0 @ cp15 power control diff --git a/arch/arm/mach-exynos/smc.h b/arch/arm/mach-exynos/smc.h index 13a1dc8..f7b82f9 100644 --- a/arch/arm/mach-exynos/smc.h +++ b/arch/arm/mach-exynos/smc.h @@ -26,6 +26,10 @@ #define SMC_CMD_L2X0INVALL (-24) #define SMC_CMD_L2X0DEBUG (-25) +#ifndef __ASSEMBLY__ + extern void exynos_smc(u32 cmd, u32 arg1, u32 arg2, u32 arg3); +#endif /* __ASSEMBLY__ */ + #endif