From patchwork Tue Jan 14 03:45:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xingyu Chen X-Patchwork-Id: 215174 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 1F5A5C33CA9 for ; Tue, 14 Jan 2020 03:48:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E638B214AF for ; Tue, 14 Jan 2020 03:48:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728924AbgANDsY (ORCPT ); Mon, 13 Jan 2020 22:48:24 -0500 Received: from mail-sz.amlogic.com ([211.162.65.117]:56845 "EHLO mail-sz.amlogic.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729783AbgANDsY (ORCPT ); Mon, 13 Jan 2020 22:48:24 -0500 Received: from droid12-sz.software.amlogic (10.28.8.22) by mail-sz.amlogic.com (10.28.11.5) with Microsoft SMTP Server id 15.1.1591.10; Tue, 14 Jan 2020 11:45:59 +0800 From: Xingyu Chen To: Wim Van Sebroeck , Guenter Roeck , Kevin Hilman , Neil Armstrong CC: Xingyu Chen , Rob Herring , Jerome Brunet , Martin Blumenstingl , Qianggui Song , Jianxin Pan , Jian Hu , , , , Subject: [PATCH v6 4/5] watchdog: add meson secure watchdog driver Date: Tue, 14 Jan 2020 11:45:26 +0800 Message-ID: <1578973527-4759-5-git-send-email-xingyu.chen@amlogic.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1578973527-4759-1-git-send-email-xingyu.chen@amlogic.com> References: <1578973527-4759-1-git-send-email-xingyu.chen@amlogic.com> MIME-Version: 1.0 X-Originating-IP: [10.28.8.22] Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org The watchdog controller on the Meson-A/C series SoCs is moved to secure world, watchdog operation needs to be done in secure EL3 mode via ATF, Non-secure world can call SMC instruction to trap to AFT for watchdog operation. Reviewed-by: Guenter Roeck Signed-off-by: Xingyu Chen --- drivers/watchdog/Kconfig | 16 ++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/meson_sec_wdt.c | 185 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 202 insertions(+) create mode 100644 drivers/watchdog/meson_sec_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 1679e0d..5f88325 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -826,6 +826,22 @@ config MESON_GXBB_WATCHDOG To compile this driver as a module, choose M here: the module will be called meson_gxbb_wdt. +config MESON_SEC_WATCHDOG + tristate "Amlogic Meson Secure watchdog support" + depends on MESON_SM + select WATCHDOG_CORE + help + The watchdog controller on the Meson-A/C series SoCs is moved to + secure world, watchdog operation needs to be done in secure EL3 + mode via ATF, non-secure world can call SMC instruction to trap + to ATF for the watchdog operation. + + Say Y here if watchdog controller on Meson SoCs is located in + secure world. + + To compile this driver as a module, choose M here: the + module will be called meson_sec_wdt. + config MESON_WATCHDOG tristate "Amlogic Meson SoCs watchdog support" depends on ARCH_MESON || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 2ee352b..5e6b73d 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -78,6 +78,7 @@ obj-$(CONFIG_QCOM_WDT) += qcom-wdt.o obj-$(CONFIG_BCM_KONA_WDT) += bcm_kona_wdt.o obj-$(CONFIG_TEGRA_WATCHDOG) += tegra_wdt.o obj-$(CONFIG_MESON_GXBB_WATCHDOG) += meson_gxbb_wdt.o +obj-$(CONFIG_MESON_SEC_WATCHDOG) += meson_sec_wdt.o obj-$(CONFIG_MESON_WATCHDOG) += meson_wdt.o obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o diff --git a/drivers/watchdog/meson_sec_wdt.c b/drivers/watchdog/meson_sec_wdt.c new file mode 100644 index 00000000..493cbe8 --- /dev/null +++ b/drivers/watchdog/meson_sec_wdt.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright (c) 2019 Amlogic, Inc. All rights reserved. + * Author: Xingyu Chen + * + */ +#include +#include +#include +#include +#include +#include +#include + +#define MESON_SIP_WDT_DISABLE 0x1 +#define MESON_SIP_WDT_ENABLE 0x2 +#define MESON_SIP_WDT_PING 0x3 +#define MESON_SIP_WDT_INIT 0x4 +#define MESON_SIP_WDT_RESETNOW 0x5 +#define MESON_SIP_WDT_SETTIMEOUT 0x6 +#define MESON_SIP_WDT_GETTIMELEFT 0x7 + +#define DEFAULT_TIMEOUT 30 /* seconds */ + +/* + * Watchdog timer tick is set to 1ms in secfw side, and tick count is + * stored in the bit[16-31] of WATCHDOG_CNT register, so the maximum + * timeout value is 0xffff ms. + */ +#define MAX_TIMEOUT_MS 0xFFFF + +struct meson_sec_wdt { + struct watchdog_device wdt_dev; + struct meson_sm_firmware *fw; +}; + +static int meson_sec_wdt_start(struct watchdog_device *wdt_dev) +{ + struct meson_sec_wdt *data = watchdog_get_drvdata(wdt_dev); + + return meson_sm_call(data->fw, SM_A1_WATCHDOG_OPS, NULL, + MESON_SIP_WDT_ENABLE, 0, 0, 0, 0); +} + +static int meson_sec_wdt_stop(struct watchdog_device *wdt_dev) +{ + struct meson_sec_wdt *data = watchdog_get_drvdata(wdt_dev); + + return meson_sm_call(data->fw, SM_A1_WATCHDOG_OPS, NULL, + MESON_SIP_WDT_DISABLE, 0, 0, 0, 0); +} + +static int meson_sec_wdt_ping(struct watchdog_device *wdt_dev) +{ + struct meson_sec_wdt *data = watchdog_get_drvdata(wdt_dev); + + return meson_sm_call(data->fw, SM_A1_WATCHDOG_OPS, NULL, + MESON_SIP_WDT_PING, 0, 0, 0, 0); +} + +static int meson_sec_wdt_set_timeout(struct watchdog_device *wdt_dev, + unsigned int timeout) +{ + struct meson_sec_wdt *data = watchdog_get_drvdata(wdt_dev); + + wdt_dev->timeout = timeout; + + return meson_sm_call(data->fw, SM_A1_WATCHDOG_OPS, NULL, + MESON_SIP_WDT_SETTIMEOUT, + wdt_dev->timeout * 1000, 0, 0, 0); +} + +static unsigned int meson_sec_wdt_get_timeleft(struct watchdog_device *wdt_dev) +{ + int ret; + unsigned int timeleft; + struct meson_sec_wdt *data = watchdog_get_drvdata(wdt_dev); + + ret = meson_sm_call(data->fw, SM_A1_WATCHDOG_OPS, &timeleft, + MESON_SIP_WDT_GETTIMELEFT, 0, 0, 0, 0); + + if (ret) + return 0; + + return timeleft; +} + +static const struct watchdog_ops meson_sec_wdt_ops = { + .start = meson_sec_wdt_start, + .stop = meson_sec_wdt_stop, + .ping = meson_sec_wdt_ping, + .set_timeout = meson_sec_wdt_set_timeout, + .get_timeleft = meson_sec_wdt_get_timeleft, +}; + +static const struct watchdog_info meson_sec_wdt_info = { + .identity = "Meson Secure Watchdog Timer", + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, +}; + +static int __maybe_unused meson_sec_wdt_resume(struct device *dev) +{ + struct meson_sec_wdt *data = dev_get_drvdata(dev); + + if (watchdog_active(&data->wdt_dev)) + return meson_sec_wdt_start(&data->wdt_dev); + + return 0; +} + +static int __maybe_unused meson_sec_wdt_suspend(struct device *dev) +{ + struct meson_sec_wdt *data = dev_get_drvdata(dev); + + if (watchdog_active(&data->wdt_dev)) + return meson_sec_wdt_stop(&data->wdt_dev); + + return 0; +} + +static const struct dev_pm_ops meson_sec_wdt_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(meson_sec_wdt_suspend, meson_sec_wdt_resume) +}; + +static const struct of_device_id meson_sec_wdt_dt_ids[] = { + { .compatible = "amlogic,meson-sec-wdt", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, meson_sec_wdt_dt_ids); + +static int meson_sec_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct meson_sec_wdt *data; + struct device_node *sm_np; + int ret; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + sm_np = dev_of_node(dev->parent); + if (!sm_np) + return -EINVAL; + + data->fw = meson_sm_get(sm_np); + if (!data->fw) + return -EPROBE_DEFER; + + platform_set_drvdata(pdev, data); + + data->wdt_dev.parent = dev; + data->wdt_dev.info = &meson_sec_wdt_info; + data->wdt_dev.ops = &meson_sec_wdt_ops; + data->wdt_dev.max_hw_heartbeat_ms = MAX_TIMEOUT_MS; + data->wdt_dev.min_timeout = 1; + data->wdt_dev.timeout = DEFAULT_TIMEOUT; + watchdog_set_drvdata(&data->wdt_dev, data); + watchdog_init_timeout(&data->wdt_dev, 0, dev); + + ret = meson_sm_call(data->fw, SM_A1_WATCHDOG_OPS, NULL, + MESON_SIP_WDT_INIT, + data->wdt_dev.timeout * 1000, 0, 0, 0); + if (ret) + return ret; + + watchdog_stop_on_reboot(&data->wdt_dev); + + return devm_watchdog_register_device(dev, &data->wdt_dev); +} + +static struct platform_driver meson_sec_wdt_driver = { + .probe = meson_sec_wdt_probe, + .driver = { + .name = "meson-sec-wdt", + .pm = &meson_sec_wdt_pm_ops, + .of_match_table = meson_sec_wdt_dt_ids, + }, +}; + +module_platform_driver(meson_sec_wdt_driver); + +MODULE_AUTHOR("Xingyu Chen "); +MODULE_DESCRIPTION("Amlogic Secure Watchdog Timer Driver"); +MODULE_LICENSE("Dual MIT/GPL");