Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752601AbaKQLtu (ORCPT ); Mon, 17 Nov 2014 06:49:50 -0500 Received: from mailout4.w1.samsung.com ([210.118.77.14]:26275 "EHLO mailout4.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751712AbaKQLsn (ORCPT ); Mon, 17 Nov 2014 06:48:43 -0500 X-AuditID: cbfec7f5-b7f956d000005ed7-34-5469e0974d6b From: Marek Szyprowski To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Marek Szyprowski , Tomasz Figa , Kyungmin Park , linux-samsung-soc@vger.kernel.org, Arnd Bergmann , Olof Johansson , Russell King - ARM Linux , Kukjin Kim , lauraa@codeaurora.org, linux-omap@vger.kernel.org, linus.walleij@linaro.org, tony@atomide.com, drake@endlessm.com, loeliger@gmail.com, Mark Rutland Subject: [PATCH v9 6/7] ARM: EXYNOS: Add support for non-secure L2X0 resume Date: Mon, 17 Nov 2014 12:48:28 +0100 Message-id: <1416224909-4290-7-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.2 In-reply-to: <1416224909-4290-1-git-send-email-m.szyprowski@samsung.com> References: <1416224909-4290-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrOLMWRmVeSWpSXmKPExsVy+t/xK7rTH2SGGDRtULT4O+kYu8Wj+Y+Z LXoXXGWzONv0ht1ie+cMdospf5YzWWx6fI3V4vKuOWwWs5f0s1jMOL+PyeL2ZV6Lc9u3sFis PXKX3WLp9YtMFqeuf2azWLXrD6PF/iteDoIea+atYfRoae5h8/j9axKjx7evk1g8Lvf1Mnks +p7lsXPWXXaPO9f2sHlsXlLvceVEE6tH35ZVjB6fN8kF8ERx2aSk5mSWpRbp2yVwZSz78ZW9 oEOionvCLNYGxlaRLkZODgkBE4nnDSfZIGwxiQv31gPZXBxCAksZJZpWr2OCcPqYJE4f+sUK UsUmYCjR9bYLrENEwE3i37pDYB3MAp+ZJS49WgNWJCzgLXHi12RGEJtFQFXiedNRsDivgLvE lo+boNbJSfx/uYIJxOYU8JD49v0AUJwDaJu7ROsjzgmMvAsYGVYxiqaWJhcUJ6XnGukVJ+YW l+al6yXn525ihAT+1x2MS49ZHWIU4GBU4uE9UJQZIsSaWFZcmXuIUYKDWUmEN+YiUIg3JbGy KrUoP76oNCe1+BAjEwenVAOj4OPWWl6hGQmNZheWbc44aai39I+ooui/ABapj911c8+dv7vP 8mxGNZ+4T80kD9+fDi9Xvm8uOTdTue3JwVw9FdZTt242pb3nnbWzovpCx6Jnixm25UqVLRLI l9BcvUH6UGTZKbnKxQ7TPnUp9N5Zpi3mX5ZftX+J0xt3y4De1XKlM725jAWUWIozEg21mIuK EwHZpXtNWgIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tomasz Figa On Exynos SoCs it is necessary to resume operation of L2C early in assembly code, because otherwise certain systems will crash. This patch adds necessary code to non-secure resume handler. Signed-off-by: Tomasz Figa [rewrote the code accessing l2x0_saved_regs, rebased onto v3.18-rc3] Sigend-off-by: Marek Szyprowski Acked-by: Arnd Bergmann Acked-by: Kukjin Kim --- arch/arm/mach-exynos/Makefile | 1 + arch/arm/mach-exynos/sleep.S | 48 +++++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-exynos/smc.h | 4 ++++ 3 files changed, 53 insertions(+) diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile index 27ae6144679c..45bef21a3b66 100644 --- a/arch/arm/mach-exynos/Makefile +++ b/arch/arm/mach-exynos/Makefile @@ -21,6 +21,7 @@ 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/sleep.S b/arch/arm/mach-exynos/sleep.S index 108a45f4bb62..5aa6b4de9274 100644 --- a/arch/arm/mach-exynos/sleep.S +++ b/arch/arm/mach-exynos/sleep.S @@ -16,6 +16,9 @@ */ #include +#include +#include +#include "smc.h" #define CPU_MASK 0xff0ffff0 #define CPU_CORTEX_A9 0x410fc090 @@ -55,3 +58,48 @@ ENTRY(exynos_cpu_resume) #endif b cpu_resume ENDPROC(exynos_cpu_resume) + +#ifdef CONFIG_CACHE_L2X0 + adr r0, 1f + ldr r2, [r0] + add r0, r2, r0 + + /* Check that the address has been initialised. */ + ldr r1, [r0, #L2X0_R_PHY_BASE] + teq r1, #0 + beq skip_l2x0 + + /* Check if controller has been enabled. */ + ldr r2, [r1, #L2X0_CTRL] + tst r2, #0x1 + bne skip_l2x0 + + ldr r1, [r0, #L2X0_R_TAG_LATENCY] + ldr r2, [r0, #L2X0_R_DATA_LATENCY] + ldr r3, [r0, #L2X0_R_PREFETCH_CTRL] + mov r0, #SMC_CMD_L2X0SETUP1 + smc #0 + + /* Reload saved regs pointer because smc corrupts registers. */ + adr r0, 1f + ldr r2, [r0] + add r0, r2, r0 + + ldr r1, [r0, #L2X0_R_PWR_CTRL] + ldr r2, [r0, #L2X0_R_AUX_CTRL] + mov r0, #SMC_CMD_L2X0SETUP2 + smc #0 + + mov r0, #SMC_CMD_L2X0INVALL + smc #0 + + mov r1, #1 + mov r0, #SMC_CMD_L2X0CTRL + smc #0 +skip_l2x0: +#endif /* CONFIG_CACHE_L2X0 */ + +#ifdef CONFIG_CACHE_L2X0 + .align +1: .long l2x0_saved_regs - . +#endif /* CONFIG_CACHE_L2X0 */ diff --git a/arch/arm/mach-exynos/smc.h b/arch/arm/mach-exynos/smc.h index 13a1dc8ecbf2..f7b82f9c1e21 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 -- 1.9.2 -- 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/