From patchwork Thu Jun 17 05:18:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel FERNANDEZ X-Patchwork-Id: 462388 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D160C49EC8 for ; Thu, 17 Jun 2021 05:18:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3B78B613D5 for ; Thu, 17 Jun 2021 05:18:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230452AbhFQFU4 (ORCPT ); Thu, 17 Jun 2021 01:20:56 -0400 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:42034 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230167AbhFQFUv (ORCPT ); Thu, 17 Jun 2021 01:20:51 -0400 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 15H5GSHt012688; Thu, 17 Jun 2021 07:18:28 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=selector1; bh=2tw5rWDfT+FJwGEPhSvgZcYVGhDJ7j9Ro7MEVoXtTbc=; b=INJqfm8QXWOQLOEJNWr+GkcJxaJ8NgeQ8FZyzjtEbdnuJOHVT9kyBO2SXWyd1LANIUyB TGBHaQ4CVbSafw7pvfcu0pUnMND31XKpsCS+U4A6BarHDdHGg4UNEFPB8FCaAmZbBsWL gVCOhGn2RkO/n6NdOJx5GFl6YKiYTAbI5f3mMZeNAq0qnCd7rGxAFZR9PKjewNiZTMCh ICHDa4ZJFLFAV2hXXeT3kLxsGzXvbSgAt23xcJ/zzJ5OB2pIqWsOXAtFcXy+PvfpMOUN ByW0K/QdcfEPij4GC+pNEmMVxLOiIzzi8/Y8cUrwYNKOkoznZKPQk1I13BgTHCR504qj RQ== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 397mmvatk4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 17 Jun 2021 07:18:28 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 0F4D710002A; Thu, 17 Jun 2021 07:18:28 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id F17E3211278; Thu, 17 Jun 2021 07:18:27 +0200 (CEST) Received: from localhost (10.75.127.47) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 17 Jun 2021 07:18:27 +0200 From: To: Michael Turquette , Stephen Boyd , Rob Herring , Maxime Coquelin , Alexandre Torgue , Philipp Zabel , Etienne Carriere , Gabriel Fernandez , CC: , , , , Subject: [RESEND PATCH v3 11/11] clk: stm32mp1: new compatible for secure RCC support Date: Thu, 17 Jun 2021 07:18:14 +0200 Message-ID: <20210617051814.12018-12-gabriel.fernandez@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210617051814.12018-1-gabriel.fernandez@foss.st.com> References: <20210617051814.12018-1-gabriel.fernandez@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG1NODE1.st.com (10.75.127.1) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-06-17_01:2021-06-15,2021-06-17 signatures=0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Gabriel Fernandez Platform STM32MP1 can be used in configuration where some clock resources cannot be accessed by Linux kernel when executing in non-secure state of the CPU(s). In such configuration, the RCC clock driver must not register clocks it cannot access. They are expected to be registered from another clock driver such as the SCMI clock driver. This change uses specific compatible string "st,stm32mp1-rcc-secure" to specify RCC clock driver configuration where RCC is secure. Signed-off-by: Etienne Carriere Signed-off-by: Gabriel Fernandez --- drivers/clk/Kconfig | 10 ++++ drivers/clk/clk-stm32mp1.c | 101 ++++++++++++++++++++++++++++++++++++- 2 files changed, 110 insertions(+), 1 deletion(-) diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index e80918be8e9c..e367a033e121 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -335,6 +335,16 @@ config COMMON_CLK_STM32MP157 help Support for stm32mp157 SoC family clocks +config COMMON_CLK_STM32MP157_SCMI + bool "stm32mp157 Clock driver with Trusted Firmware" + depends on COMMON_CLK_STM32MP157 + select COMMON_CLK_SCMI + select ARM_SCMI_PROTOCOL + default y + help + Support for stm32mp157 SoC family clocks with Trusted Firmware using + SCMI protocol. + config COMMON_CLK_STM32F def_bool COMMON_CLK && (MACH_STM32F429 || MACH_STM32F469 || MACH_STM32F746) help diff --git a/drivers/clk/clk-stm32mp1.c b/drivers/clk/clk-stm32mp1.c index 6d3a36f81b2d..6adc625e79cb 100644 --- a/drivers/clk/clk-stm32mp1.c +++ b/drivers/clk/clk-stm32mp1.c @@ -2056,11 +2056,61 @@ static const struct clock_config stm32mp1_clock_cfg[] = { _DIV(RCC_DBGCFGR, 0, 3, 0, ck_trace_div_table)), }; +static const u32 stm32mp1_clock_secured[] = { + CK_HSE, + CK_HSI, + CK_CSI, + CK_LSI, + CK_LSE, + PLL1, + PLL2, + PLL1_P, + PLL2_P, + PLL2_Q, + PLL2_R, + CK_MPU, + CK_AXI, + SPI6, + I2C4, + I2C6, + USART1, + RTCAPB, + TZC1, + TZC2, + TZPC, + IWDG1, + BSEC, + STGEN, + GPIOZ, + CRYP1, + HASH1, + RNG1, + BKPSRAM, + RNG1_K, + STGEN_K, + SPI6_K, + I2C4_K, + I2C6_K, + USART1_K, + RTC, +}; + +static bool stm32_check_security(const struct clock_config *cfg) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(stm32mp1_clock_secured); i++) + if (cfg->id == stm32mp1_clock_secured[i]) + return true; + return false; +} + struct stm32_rcc_match_data { const struct clock_config *cfg; unsigned int num; unsigned int maxbinding; u32 clear_offset; + bool (*check_security)(const struct clock_config *cfg); }; static struct stm32_rcc_match_data stm32mp1_data = { @@ -2070,11 +2120,23 @@ static struct stm32_rcc_match_data stm32mp1_data = { .clear_offset = RCC_CLR, }; +static struct stm32_rcc_match_data stm32mp1_data_secure = { + .cfg = stm32mp1_clock_cfg, + .num = ARRAY_SIZE(stm32mp1_clock_cfg), + .maxbinding = STM32MP1_LAST_CLK, + .clear_offset = RCC_CLR, + .check_security = &stm32_check_security +}; + static const struct of_device_id stm32mp1_match_data[] = { { .compatible = "st,stm32mp1-rcc", .data = &stm32mp1_data, }, + { + .compatible = "st,stm32mp1-rcc-secure", + .data = &stm32mp1_data_secure, + }, { } }; MODULE_DEVICE_TABLE(of, stm32mp1_match_data); @@ -2234,6 +2296,9 @@ static int stm32_rcc_clock_init(struct device *dev, void __iomem *base, hws[n] = ERR_PTR(-ENOENT); for (n = 0; n < data->num; n++) { + if (data->check_security && data->check_security(&data->cfg[n])) + continue; + err = stm32_register_hw_clk(dev, clk_data, base, &rlock, &data->cfg[n]); if (err) { @@ -2301,11 +2366,45 @@ static int stm32mp1_rcc_init(struct device *dev) return ret; } +static int get_clock_deps(struct device *dev) +{ + static const char * const clock_deps_name[] = { + "hsi", "hse", "csi", "lsi", "lse", + }; + size_t deps_size = sizeof(struct clk *) * ARRAY_SIZE(clock_deps_name); + struct clk **clk_deps; + int i; + + clk_deps = devm_kzalloc(dev, deps_size, GFP_KERNEL); + if (!clk_deps) + return -ENOMEM; + + for (i = 0; i < ARRAY_SIZE(clock_deps_name); i++) { + struct clk *clk = of_clk_get_by_name(dev_of_node(dev), + clock_deps_name[i]); + + if (IS_ERR(clk)) { + if (PTR_ERR(clk) != -EINVAL && PTR_ERR(clk) != -ENOENT) + return PTR_ERR(clk); + } else { + /* Device gets a reference count on the clock */ + clk_deps[i] = devm_clk_get(dev, __clk_get_name(clk)); + clk_put(clk); + } + } + + return 0; +} + static int stm32mp1_rcc_clocks_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + int ret = get_clock_deps(dev); + + if (!ret) + ret = stm32mp1_rcc_init(dev); - return stm32mp1_rcc_init(dev); + return ret; } static int stm32mp1_rcc_clocks_remove(struct platform_device *pdev)