From patchwork Mon Nov 25 12:33:38 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xingyu Chen X-Patchwork-Id: 11260329 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 58A6913A4 for ; Mon, 25 Nov 2019 12:33:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 39F7B207FD for ; Mon, 25 Nov 2019 12:33:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727262AbfKYMdt (ORCPT ); Mon, 25 Nov 2019 07:33:49 -0500 Received: from mail-sz.amlogic.com ([211.162.65.117]:24866 "EHLO mail-sz.amlogic.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725823AbfKYMds (ORCPT ); Mon, 25 Nov 2019 07:33:48 -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; Mon, 25 Nov 2019 20:34:07 +0800 From: Xingyu Chen To: Wim Van Sebroeck , Guenter Roeck , Kevin Hilman , Neil Armstrong , Rob Herring CC: Xingyu Chen , Jerome Brunet , Qianggui Song , Jianxin Pan , Jian Hu , , , , Subject: [PATCH v4 2/2] watchdog: add meson secure watchdog driver Date: Mon, 25 Nov 2019 20:33:38 +0800 Message-ID: <1574685218-31164-3-git-send-email-xingyu.chen@amlogic.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1574685218-31164-1-git-send-email-xingyu.chen@amlogic.com> References: <1574685218-31164-1-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. Signed-off-by: Xingyu Chen --- drivers/watchdog/Kconfig | 16 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/meson_sec_wdt.c | 207 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 224 insertions(+) create mode 100644 drivers/watchdog/meson_sec_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 58e7c10..e305fba 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..c022d6d --- /dev/null +++ b/drivers/watchdog/meson_sec_wdt.c @@ -0,0 +1,207 @@ +// 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 +#define DRV_NAME "meson-sec-wdt" + +static struct platform_device *platform_device; +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 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 = of_find_compatible_node(NULL, NULL, "amlogic,meson-gxbb-sm"); + if (!sm_np) { + dev_err(&pdev->dev, "no secure-monitor node\n"); + return -EINVAL; + } + + data->fw = meson_sm_get(sm_np); + of_node_put(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); + + 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 = DRV_NAME, + .pm = &meson_sec_wdt_pm_ops, + }, +}; + +static int __init meson_sec_wdt_init(void) +{ + int ret; + + ret = platform_driver_register(&meson_sec_wdt_driver); + if (ret) + return ret; + + platform_device = platform_device_register_simple(DRV_NAME, + -1, NULL, 0); + if (IS_ERR(platform_device)) { + ret = PTR_ERR(platform_device); + platform_driver_unregister(&meson_sec_wdt_driver); + } + + return ret; +} + +static void __exit meson_sec_wdt_exit(void) +{ + platform_device_unregister(platform_device); + platform_driver_unregister(&meson_sec_wdt_driver); +} + +module_init(meson_sec_wdt_init); +module_exit(meson_sec_wdt_exit); + +MODULE_AUTHOR("Xingyu Chen "); +MODULE_DESCRIPTION("Amlogic Secure Watchdog Timer Driver"); +MODULE_LICENSE("Dual MIT/GPL");