From patchwork Wed Jan 7 11:30:22 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 5584191 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 759E19F357 for ; Wed, 7 Jan 2015 11:46:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A1B6620263 for ; Wed, 7 Jan 2015 11:46:06 +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 BAA892025B for ; Wed, 7 Jan 2015 11:46:05 +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 1Y8p0v-0005mq-KE; Wed, 07 Jan 2015 11:43:01 +0000 Received: from mailout2.w1.samsung.com ([210.118.77.12]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y8opO-0004wk-3P for linux-arm-kernel@lists.infradead.org; Wed, 07 Jan 2015 11:31:07 +0000 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout2.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NHT00NW21HS0S90@mailout2.w1.samsung.com> for linux-arm-kernel@lists.infradead.org; Wed, 07 Jan 2015 11:34:40 +0000 (GMT) X-AuditID: cbfec7f5-b7fc86d0000066b7-f0-54ad18dc77b1 Received: from eusync3.samsung.com ( [203.254.199.213]) by eucpsbgm2.samsung.com (EUCPMTA) with SMTP id 14.73.26295.CD81DA45; Wed, 07 Jan 2015 11:30:36 +0000 (GMT) Received: from amdc1339.digital.local ([106.116.147.30]) by eusync3.samsung.com (Oracle Communications Messaging Server 7u4-23.01 (7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPA id <0NHT00KW81APYS90@eusync3.samsung.com>; Wed, 07 Jan 2015 11:30:35 +0000 (GMT) From: Marek Szyprowski To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v12 7/9] ARM: EXYNOS: Add .write_sec outer cache callback for L2C-310 Date: Wed, 07 Jan 2015 12:30:22 +0100 Message-id: <1420630224-8887-8-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.2 In-reply-to: <1420630224-8887-1-git-send-email-m.szyprowski@samsung.com> References: <1420630224-8887-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrGLMWRmVeSWpSXmKPExsVy+t/xq7p3JNaGGHw7pGnxd9IxdotH8x8z W/QuuMpm8fXwCkaLs01v2C22d85gt5jyZzmTxabH11gtLu+aw2Yxe0k/i8WM8/uYLG5f5rU4 t30Li8XaI3fZLZZev8hk8ebHWSaLU9c/s1ms2vWH0WL/FS8HYY8189YwerQ097B5/P41idHj 29dJLB6X+3qZPBZ9z/LYOesuu8eda3vYPDYvqfe4cqKJ1aNvyypGj+M3tjN5fN4kF8AbxWWT kpqTWZZapG+XwJXRuFOlYK94RdOC1ewNjOuEuxg5OSQETCS2vHjECmGLSVy4t56ti5GLQ0hg KaNEz45+dginj0nifOcnFpAqNgFDia63XWwgtoiAm8S/dYfAOpgFprFIbDpynhkkISwQLnF8 5mR2EJtFQFViUf9NsBW8Au4SO862MUKsk5P4/3IFE4jNKeAhcef8MjBbCKhmwcSVbBMYeRcw MqxiFE0tTS4oTkrPNdIrTswtLs1L10vOz93ECImLrzsYlx6zOsQowMGoxMOrMHlNiBBrYllx Ze4hRgkOZiUR3je/gEK8KYmVValF+fFFpTmpxYcYmTg4pRoYt/g17g9afCJj6eaozo4HK/k6 JBz2l32sX59et+v3trQf24V2XBP7VtW11/J/d5/WfF/lsg0/94oe5/n+XtlMWH4235PlmewB 78J41k5Nunsg/B/XJeGVszwyWo7NaVG5uivvtuXPtxFJrk4pX0InB+7gPKa8VO3rNoO1vh8E grUFu7Ofdzt/UWIpzkg01GIuKk4EAM7M9ztpAgAA X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150107_033106_348076_1968E93D X-CRM114-Status: GOOD ( 13.41 ) X-Spam-Score: -5.0 (-----) Cc: Mark Rutland , nm@ti.com, linux-samsung-soc@vger.kernel.org, Russell King - ARM Linux , Arnd Bergmann , tony@atomide.com, linus.walleij@linaro.org, Tomasz Figa , drake@endlessm.com, loeliger@gmail.com, Kyungmin Park , Kukjin Kim , Olof Johansson , lauraa@codeaurora.org, linux-omap@vger.kernel.org, khilman@linaro.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=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_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 From: Tomasz Figa Exynos4 SoCs equipped with an L2C-310 cache controller and running under secure firmware require certain registers of aforementioned IP to be accessed only from secure mode. This means that SMC calls are required for certain register writes. To handle this, an implementation of .write_sec and .configure callbacks is provided by this patch. Signed-off-by: Tomasz Figa [added comment and reworked unconditional call to SMC_CMD_L2X0INVALL] Signed-off-by: Marek Szyprowski Acked-by: Arnd Bergmann Acked-by: Kukjin Kim --- arch/arm/mach-exynos/firmware.c | 50 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c index 766f57d2f029..4791a3cc00f9 100644 --- a/arch/arm/mach-exynos/firmware.c +++ b/arch/arm/mach-exynos/firmware.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -136,6 +137,43 @@ static const struct firmware_ops exynos_firmware_ops = { .resume = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_resume : NULL, }; +static void exynos_l2_write_sec(unsigned long val, unsigned reg) +{ + static int l2cache_enabled; + + switch (reg) { + case L2X0_CTRL: + if (val & L2X0_CTRL_EN) { + /* + * Before the cache can be enabled, due to firmware + * design, SMC_CMD_L2X0INVALL must be called. + */ + if (!l2cache_enabled) { + exynos_smc(SMC_CMD_L2X0INVALL, 0, 0, 0); + l2cache_enabled = 1; + } + } else { + l2cache_enabled = 0; + } + exynos_smc(SMC_CMD_L2X0CTRL, val, 0, 0); + break; + + case L2X0_DEBUG_CTRL: + exynos_smc(SMC_CMD_L2X0DEBUG, val, 0, 0); + break; + + default: + WARN_ONCE(1, "%s: ignoring write to reg 0x%x\n", __func__, reg); + } +} + +static void exynos_l2_configure(const struct l2x0_regs *regs) +{ + exynos_smc(SMC_CMD_L2X0SETUP1, regs->tag_latency, regs->data_latency, + regs->prefetch_ctrl); + exynos_smc(SMC_CMD_L2X0SETUP2, regs->pwr_ctrl, regs->aux_ctrl, 0); +} + void __init exynos_firmware_init(void) { struct device_node *nd; @@ -155,4 +193,16 @@ void __init exynos_firmware_init(void) pr_info("Running under secure firmware.\n"); register_firmware_ops(&exynos_firmware_ops); + + /* + * Exynos 4 SoCs (based on Cortex A9 and equipped with L2C-310), + * running under secure firmware, require certain registers of L2 + * cache controller to be written in secure mode. Here .write_sec + * callback is provided to perform necessary SMC calls. + */ + if (IS_ENABLED(CONFIG_CACHE_L2X0) && + read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) { + outer_cache.write_sec = exynos_l2_write_sec; + outer_cache.configure = exynos_l2_configure; + } }