From patchwork Tue Jan 24 08:58:40 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoyou Xie X-Patchwork-Id: 92296 Delivered-To: patch@linaro.org Received: by 10.140.20.99 with SMTP id 90csp1614750qgi; Tue, 24 Jan 2017 00:59:15 -0800 (PST) X-Received: by 10.99.122.17 with SMTP id v17mr37936012pgc.31.1485248355095; Tue, 24 Jan 2017 00:59:15 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d1si2435795pli.33.2017.01.24.00.59.14 for ; Tue, 24 Jan 2017 00:59:15 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-watchdog-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-watchdog-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-watchdog-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750831AbdAXI7O (ORCPT ); Tue, 24 Jan 2017 03:59:14 -0500 Received: from mail-pg0-f50.google.com ([74.125.83.50]:36128 "EHLO mail-pg0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750765AbdAXI7N (ORCPT ); Tue, 24 Jan 2017 03:59:13 -0500 Received: by mail-pg0-f50.google.com with SMTP id t6so53405603pgt.3 for ; Tue, 24 Jan 2017 00:59:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=suDjTUDx7TVtvwl9Sk+CFh4PXsfTmjT/7SVPrP2nLqE=; b=FsB92GuPvNtn9ID3PsymHZZjNVfQY83lX+rI/oJz8QtHvLJj5yeuETe4v8Yk+cOC+/ ycjrU5ec7FH9UT4SPo6fu4dAZWEwcRPck7Tpc3n2yOaLIj1Cv86IOFbd1Wjr9zzbV0mg 53H4oKeGQwN+j6lOfqDds7WQh+J3bWddt1TK0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=suDjTUDx7TVtvwl9Sk+CFh4PXsfTmjT/7SVPrP2nLqE=; b=VGrmocxFvbM3oKGWzoU2AykIGtcTUjW90B4IKFz9gM221efOVf/XvW7Dr7pUDn6PKm k0xsI9ycrgVoM33C3yXSI5kH0EtfXVdzqaTFmDzrE0TMdW2VAkKmT4rLXyeD1bR3t8nD lRJxB/QaP00Z49UUltT1ej2QkBNKYUY59CHNuKJ/nV81kZy41N8yTulFGENskXzLZMkF zYg1wPdqTz1209m26XFHtsG2ISuMBzc7/Kqs2ihGm/tsA8AhOsf/ywAn4rp0pUtEuBOQ 3xtdnSmllPpLfkTZlMYqYF7sCVykrB5FaWNGIsRkKQxYHMm0zqH2o+3cq3EwMnRJSIGY pUjQ== X-Gm-Message-State: AIkVDXIaWTIgA35kZEhUiS+5pr9dIVLkxvhR+AeF+GhTluyq/INOD78Cqc+1XKMRqAfpjDHG X-Received: by 10.84.176.1 with SMTP id u1mr49607593plb.71.1485248353006; Tue, 24 Jan 2017 00:59:13 -0800 (PST) Received: from localhost.localdomain ([45.56.152.52]) by smtp.gmail.com with ESMTPSA id q5sm3653247pgf.45.2017.01.24.00.58.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 24 Jan 2017 00:59:12 -0800 (PST) From: Baoyou Xie To: jun.nie@linaro.org, wim@iguana.be, linux@roeck-us.net, robh+dt@kernel.org, mark.rutland@arm.com, mathieu.poirier@linaro.org Cc: linux-arm-kernel@lists.infradead.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, shawnguo@kernel.org, baoyou.xie@linaro.org, xie.baoyou@zte.com.cn, chen.chaokai@zte.com.cn, wang.qiang01@zte.com.cn Subject: [PATCH v5 1/3] dt: bindings: add documentation for zx2967 family watchdog controller Date: Tue, 24 Jan 2017 16:58:40 +0800 Message-Id: <1485248322-24299-1-git-send-email-baoyou.xie@linaro.org> X-Mailer: git-send-email 2.7.4 Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org This patch adds dt-binding documentation for zx2967 family watchdog controller. Signed-off-by: Baoyou Xie Acked-by: Rob Herring --- .../bindings/watchdog/zte,zx2967-wdt.txt | 31 ++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt b/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt new file mode 100644 index 0000000..772403a --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt @@ -0,0 +1,31 @@ +ZTE zx2967 Watchdog timer + +Required properties: + +- compatible : should be one of the following. + * zte,zx296718-wdt +- reg : Specifies base physical address and size of the registers. +- clocks : Pairs of phandle and specifier referencing the controller's clocks. +- resets : Reference to the reset controller controlling the watchdog + controller. + +Optional properties: + +- zte,wdt-reset-sysctrl : Directs how to reset system by the watchdog. + if we don't want to restart system when watchdog been triggered, + it's not required, vice versa. + It should include following fields. + * phandle of aon-sysctrl. + * offset of register that be written, should be 0xb0. + * configure value that be written to aon-sysctrl. + * bit mask, corresponding bits will be affected. + +Example: + +wdt: watchdog@1465000 { + compatible = "zte,zx296718-wdt"; + reg = <0x1465000 0x1000>; + clocks = <&topcrm WDT_WCLK>; + resets = <&toprst 35>; + zte,wdt-reset-sysctrl = <&aon_sysctrl 0xb0 1 0x115>; +}; From patchwork Tue Jan 24 08:58:41 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoyou Xie X-Patchwork-Id: 92300 Delivered-To: patch@linaro.org Received: by 10.140.20.99 with SMTP id 90csp1614917qgi; Tue, 24 Jan 2017 00:59:49 -0800 (PST) X-Received: by 10.84.211.7 with SMTP id b7mr49154855pli.82.1485248389893; Tue, 24 Jan 2017 00:59:49 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 35si18373998pgx.238.2017.01.24.00.59.49; Tue, 24 Jan 2017 00:59:49 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751134AbdAXI7i (ORCPT + 25 others); Tue, 24 Jan 2017 03:59:38 -0500 Received: from mail-pf0-f181.google.com ([209.85.192.181]:35440 "EHLO mail-pf0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751087AbdAXI7f (ORCPT ); Tue, 24 Jan 2017 03:59:35 -0500 Received: by mail-pf0-f181.google.com with SMTP id f144so48869906pfa.2 for ; Tue, 24 Jan 2017 00:59:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Bp3j5DodJQ5kA+onWaBYsyhHHbKAkehXcC9DybKAhV4=; b=f1A1OjXQq7B09imaJWU84W2jzUJmmDpgFdKqJrKLGq04YTT5XHDDodpdbcw563VqSz jCuCoPpWYRcygO9t4xvLvjTLni4lE/n7ure5w+2mBqB8Egt38wtfOIZWSsB29mAMAWV2 NVxFSB9GGd2LAA2YPu+75rjcI/LNcGO7HxEq8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Bp3j5DodJQ5kA+onWaBYsyhHHbKAkehXcC9DybKAhV4=; b=GCGnYwtDGzUgk9rglHy1XueX5pm58hc4rb1166oUlaYk8EUK24DRqg92HsvV9WAwy1 HO7391fuegAoE7b9Y3j95ccffuCCL8ZfVwOXbXzwh+E6HjDLht/0s0ZnOUTPr3AK+eli VBLVJqZaKmw17xdhtl0ekJGt0X2itXVlXh5GUWaMaHYc5ga+TB8KylfHro+OaF4WIuuq F3jvrO4PtMVp6yDKX7z4AL6VWbQGPmrhZWEcl7wE5FevgRSW3FAp2RompxaA9eVjg98a FTrn31QfJc+5pKQJ2UlyPabIWHDRCduoF4wGaL9sr/SntOmcesyXSJ8M7qTgx47Y1Z8M cdCA== X-Gm-Message-State: AIkVDXKJwH3OU5j/VplyHL6bCdse/6l88F95t1HuqRD13H4HgQKx9pKC/3k78jk6/z5Nmtyk X-Received: by 10.98.206.6 with SMTP id y6mr36816994pfg.122.1485248364854; Tue, 24 Jan 2017 00:59:24 -0800 (PST) Received: from localhost.localdomain ([45.56.152.52]) by smtp.gmail.com with ESMTPSA id q5sm3653247pgf.45.2017.01.24.00.59.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 24 Jan 2017 00:59:24 -0800 (PST) From: Baoyou Xie To: jun.nie@linaro.org, wim@iguana.be, linux@roeck-us.net, robh+dt@kernel.org, mark.rutland@arm.com, mathieu.poirier@linaro.org Cc: linux-arm-kernel@lists.infradead.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, shawnguo@kernel.org, baoyou.xie@linaro.org, xie.baoyou@zte.com.cn, chen.chaokai@zte.com.cn, wang.qiang01@zte.com.cn Subject: [PATCH v5 2/3] MAINTAINERS: add zx2967 watchdog controller driver to ARM ZTE architecture Date: Tue, 24 Jan 2017 16:58:41 +0800 Message-Id: <1485248322-24299-2-git-send-email-baoyou.xie@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1485248322-24299-1-git-send-email-baoyou.xie@linaro.org> References: <1485248322-24299-1-git-send-email-baoyou.xie@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add the zx2967 watchdog controller driver as maintained by ARM ZTE architecture maintainers, as they're parts of the core IP. Signed-off-by: Baoyou Xie --- MAINTAINERS | 2 ++ 1 file changed, 2 insertions(+) -- 2.7.4 diff --git a/MAINTAINERS b/MAINTAINERS index edfdea3..275c434 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1990,11 +1990,13 @@ F: drivers/clk/zte/ F: drivers/reset/reset-zx2967.c F: drivers/soc/zte/ F: drivers/thermal/zx* +F: drivers/watchdog/zx2967_wdt.c F: Documentation/devicetree/bindings/arm/zte.txt F: Documentation/devicetree/bindings/clock/zx296702-clk.txt F: Documentation/devicetree/bindings/reset/zte,zx2967-reset.txt F: Documentation/devicetree/bindings/soc/zte/ F: Documentation/devicetree/bindings/thermal/zx* +F: Documentation/devicetree/bindings/watchdog/zte,zx2967-wdt.txt F: include/dt-bindings/soc/zx*.h ARM/ZYNQ ARCHITECTURE From patchwork Tue Jan 24 08:58:42 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoyou Xie X-Patchwork-Id: 92299 Delivered-To: patch@linaro.org Received: by 10.140.20.99 with SMTP id 90csp1614891qgi; Tue, 24 Jan 2017 00:59:44 -0800 (PST) X-Received: by 10.84.209.172 with SMTP id y41mr49097590plh.96.1485248383976; Tue, 24 Jan 2017 00:59:43 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id t30si18426363pfl.149.2017.01.24.00.59.43; Tue, 24 Jan 2017 00:59:43 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751186AbdAXI7l (ORCPT + 25 others); Tue, 24 Jan 2017 03:59:41 -0500 Received: from mail-pg0-f50.google.com ([74.125.83.50]:36181 "EHLO mail-pg0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751139AbdAXI7i (ORCPT ); Tue, 24 Jan 2017 03:59:38 -0500 Received: by mail-pg0-f50.google.com with SMTP id t6so53408576pgt.3 for ; Tue, 24 Jan 2017 00:59:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=OtvUGJHAiI0DENo7P9JavfQM26WvYVvHKVfmKmYG5YU=; b=NV1hwPO7FLwzyvk+wOJNlCpYqWTyaLZYeop0Ayp+isLBJ49EDzjzb/OkWBUoxO4JyH 03OkKOWkjYiwulkNcRGczxSppYqxywrg5PFNif6vH1MVK9gD/mMPRlRZzxAWe7S/GJzf /9uw6a43HmyOcztf3BaCq+2E8N4tXgfULIsdY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=OtvUGJHAiI0DENo7P9JavfQM26WvYVvHKVfmKmYG5YU=; b=HjYKQP45Utm0YWLQEahizVnFETnUVbEa9GLbHeFjlQh2UkorPNfv+wxp339tB6lnHu ISW+7JMsmtGLQfyea9RzmP4gbooIqu+meT5uQGjQIdU/lAqu02ZH3ZD/lsYxToUJnWLN 6BnIB16t/02dGi44NXQv0Q6sNOQq+VPvMEpexVCYyNFrtZvOshMM/MsCs9sLpWHmBq0n y1heUfXZH2f0vj92e6z0///eUv2lIT8QEO9eVmtHoOK+93gWnFLj4SIAyyColLFlC3sl 0wQ2t1kS2ik3cQJpALcoB0gNH4dsP3yAXecvIq8LgOmCo5/S/PZCE4NovWsfDXbaYdsZ biCw== X-Gm-Message-State: AIkVDXKnuMf54X05FIt02k2Ln9NMSnw/4UQFFp3KkhVHg4IsvHmusN39oPvn3JJY8rEJoE/0 X-Received: by 10.98.64.3 with SMTP id n3mr37516565pfa.2.1485248377989; Tue, 24 Jan 2017 00:59:37 -0800 (PST) Received: from localhost.localdomain ([45.56.152.52]) by smtp.gmail.com with ESMTPSA id q5sm3653247pgf.45.2017.01.24.00.59.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 24 Jan 2017 00:59:37 -0800 (PST) From: Baoyou Xie To: jun.nie@linaro.org, wim@iguana.be, linux@roeck-us.net, robh+dt@kernel.org, mark.rutland@arm.com, mathieu.poirier@linaro.org Cc: linux-arm-kernel@lists.infradead.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, shawnguo@kernel.org, baoyou.xie@linaro.org, xie.baoyou@zte.com.cn, chen.chaokai@zte.com.cn, wang.qiang01@zte.com.cn Subject: [PATCH v5 3/3] watchdog: zx2967: add watchdog controller driver for ZTE's zx2967 family Date: Tue, 24 Jan 2017 16:58:42 +0800 Message-Id: <1485248322-24299-3-git-send-email-baoyou.xie@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1485248322-24299-1-git-send-email-baoyou.xie@linaro.org> References: <1485248322-24299-1-git-send-email-baoyou.xie@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds watchdog controller driver for ZTE's zx2967 family. Signed-off-by: Baoyou Xie --- drivers/watchdog/Kconfig | 10 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/zx2967_wdt.c | 274 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 285 insertions(+) create mode 100644 drivers/watchdog/zx2967_wdt.c -- 2.7.4 diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index acb00b5..05093a2 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -714,6 +714,16 @@ config ASPEED_WATCHDOG To compile this driver as a module, choose M here: the module will be called aspeed_wdt. +config ZX2967_WATCHDOG + tristate "ZTE zx2967 SoCs watchdog support" + depends on ARCH_ZX + select WATCHDOG_CORE + help + Say Y here to include support for the watchdog timer + in ZTE zx2967 SoCs. + To compile this driver as a module, choose M here: the + module will be called zx2967_wdt. + # AVR32 Architecture config AT32AP700X_WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 0c3d35e..bf2d296 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -82,6 +82,7 @@ obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o +obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o # AVR32 Architecture obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o diff --git a/drivers/watchdog/zx2967_wdt.c b/drivers/watchdog/zx2967_wdt.c new file mode 100644 index 0000000..89a7018 --- /dev/null +++ b/drivers/watchdog/zx2967_wdt.c @@ -0,0 +1,274 @@ +/* + * watchdog driver for ZTE's zx2967 family + * + * Copyright (C) 2017 ZTE Ltd. + * + * Author: Baoyou Xie + * + * License terms: GNU General Public License (GPL) version 2 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ZX2967_WDT_CFG_REG 0x4 +#define ZX2967_WDT_LOAD_REG 0x8 +#define ZX2967_WDT_REFRESH_REG 0x18 +#define ZX2967_WDT_START_REG 0x1c + +#define ZX2967_WDT_REFRESH_MASK 0x3f + +#define ZX2967_WDT_CFG_DIV(n) ((((n) & 0xff) - 1) << 8) +#define ZX2967_WDT_START_EN 0x1 + +#define ZX2967_WDT_WRITEKEY 0x12340000 + +#define ZX2967_WDT_DIV_DEFAULT 16 +#define ZX2967_WDT_DEFAULT_TIMEOUT 32 +#define ZX2967_WDT_MIN_TIMEOUT 1 +#define ZX2967_WDT_MAX_TIMEOUT 500 +#define ZX2967_WDT_MAX_COUNT 0xffff + +#define ZX2967_WDT_CLK_FREQ 0x8000 + +#define ZX2967_WDT_FLAG_REBOOT_MON BIT(0) + +struct zx2967_wdt { + struct watchdog_device wdt_device; + void __iomem *reg_base; + struct clk *clock; +}; + +static inline u32 zx2967_wdt_readl(struct zx2967_wdt *wdt, u16 reg) +{ + return readl_relaxed(wdt->reg_base + reg); +} + +static inline void zx2967_wdt_writel(struct zx2967_wdt *wdt, u16 reg, u32 val) +{ + writel_relaxed(val | ZX2967_WDT_WRITEKEY, wdt->reg_base + reg); +} + +static void zx2967_wdt_refresh(struct zx2967_wdt *wdt) +{ + u32 val; + + val = zx2967_wdt_readl(wdt, ZX2967_WDT_REFRESH_REG); + val ^= ZX2967_WDT_REFRESH_MASK; + zx2967_wdt_writel(wdt, ZX2967_WDT_REFRESH_REG, val); +} + +static int +zx2967_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout) +{ + struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd); + unsigned int divisor = ZX2967_WDT_DIV_DEFAULT; + unsigned int count; + + count = timeout * ZX2967_WDT_CLK_FREQ; + if (count > divisor * ZX2967_WDT_MAX_COUNT) + divisor = DIV_ROUND_UP(count, ZX2967_WDT_MAX_COUNT); + count = DIV_ROUND_UP(count, divisor); + zx2967_wdt_writel(wdt, ZX2967_WDT_CFG_REG, ZX2967_WDT_CFG_DIV(divisor)); + zx2967_wdt_writel(wdt, ZX2967_WDT_LOAD_REG, count); + zx2967_wdt_refresh(wdt); + wdd->timeout = (count * divisor) / ZX2967_WDT_CLK_FREQ; + + return 0; +} + +static void __zx2967_wdt_start(struct zx2967_wdt *wdt) +{ + u32 val; + + val = zx2967_wdt_readl(wdt, ZX2967_WDT_START_REG); + val |= ZX2967_WDT_START_EN; + zx2967_wdt_writel(wdt, ZX2967_WDT_START_REG, val); +} + +static void __zx2967_wdt_stop(struct zx2967_wdt *wdt) +{ + u32 val; + + val = zx2967_wdt_readl(wdt, ZX2967_WDT_START_REG); + val &= ~ZX2967_WDT_START_EN; + zx2967_wdt_writel(wdt, ZX2967_WDT_START_REG, val); +} + +static int zx2967_wdt_start(struct watchdog_device *wdd) +{ + struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd); + + zx2967_wdt_set_timeout(wdd, wdd->timeout); + __zx2967_wdt_start(wdt); + + return 0; +} + +static int zx2967_wdt_stop(struct watchdog_device *wdd) +{ + struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd); + + __zx2967_wdt_stop(wdt); + + return 0; +} + +static int zx2967_wdt_keepalive(struct watchdog_device *wdd) +{ + struct zx2967_wdt *wdt = watchdog_get_drvdata(wdd); + + zx2967_wdt_refresh(wdt); + + return 0; +} + +#define ZX2967_WDT_OPTIONS \ + (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE) +static const struct watchdog_info zx2967_wdt_ident = { + .options = ZX2967_WDT_OPTIONS, + .firmware_version = 0, + .identity = "zx2967 watchdog", +}; + +static struct watchdog_ops zx2967_wdt_ops = { + .owner = THIS_MODULE, + .start = zx2967_wdt_start, + .stop = zx2967_wdt_stop, + .ping = zx2967_wdt_keepalive, + .set_timeout = zx2967_wdt_set_timeout, +}; + +static void zx2967_wdt_reset_sysctrl(struct device *dev) +{ + int ret; + void __iomem *regmap; + unsigned int offset, mask, config; + struct of_phandle_args out_args; + + ret = of_parse_phandle_with_fixed_args(dev->of_node, + "zte,wdt-reset-sysctrl", 3, 0, &out_args); + if (ret) + return; + + offset = out_args.args[0]; + config = out_args.args[1]; + mask = out_args.args[2]; + + regmap = syscon_node_to_regmap(out_args.np); + if (IS_ERR(regmap)) + return; + + regmap_update_bits(regmap, offset, mask, config); +} + +static int zx2967_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct zx2967_wdt *wdt; + struct resource *base; + int ret; + struct reset_control *rstc; + + wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); + if (!wdt) + return -ENOMEM; + + platform_set_drvdata(pdev, wdt); + + wdt->wdt_device.info = &zx2967_wdt_ident; + wdt->wdt_device.ops = &zx2967_wdt_ops; + wdt->wdt_device.timeout = ZX2967_WDT_DEFAULT_TIMEOUT; + wdt->wdt_device.max_timeout = ZX2967_WDT_MAX_TIMEOUT; + wdt->wdt_device.min_timeout = ZX2967_WDT_MIN_TIMEOUT; + wdt->wdt_device.parent = &pdev->dev; + + base = platform_get_resource(pdev, IORESOURCE_MEM, 0); + wdt->reg_base = devm_ioremap_resource(dev, base); + if (IS_ERR(wdt->reg_base)) { + dev_err(dev, "ioremap failed\n"); + return PTR_ERR(wdt->reg_base); + } + + zx2967_wdt_reset_sysctrl(dev); + + wdt->clock = devm_clk_get(dev, NULL); + if (IS_ERR(wdt->clock)) { + dev_err(dev, "failed to find watchdog clock source\n"); + return PTR_ERR(wdt->clock); + } + + ret = clk_prepare_enable(wdt->clock); + if (ret < 0) { + dev_err(dev, "failed to enable clock\n"); + return ret; + } + clk_set_rate(wdt->clock, ZX2967_WDT_CLK_FREQ); + + rstc = devm_reset_control_get(dev, NULL); + if (IS_ERR(rstc)) { + dev_err(dev, "failed to get rstc"); + ret = PTR_ERR(rstc); + goto fail_get_reset_control; + } + + reset_control_assert(rstc); + mdelay(10); + reset_control_deassert(rstc); + + watchdog_set_drvdata(&wdt->wdt_device, wdt); + watchdog_set_nowayout(&wdt->wdt_device, WATCHDOG_NOWAYOUT); + + ret = watchdog_register_device(&wdt->wdt_device); + if (ret) + goto fail_register; + + dev_info(dev, "watchdog enabled (timeout=%d sec, nowayout=%d)", + wdt->wdt_device.timeout, WATCHDOG_NOWAYOUT); + + return 0; + +fail_register: + watchdog_unregister_device(&wdt->wdt_device); +fail_get_reset_control: + clk_disable_unprepare(wdt->clock); + return ret; +} + +static int zx2967_wdt_remove(struct platform_device *pdev) +{ + struct zx2967_wdt *wdt = platform_get_drvdata(pdev); + + watchdog_unregister_device(&wdt->wdt_device); + clk_disable_unprepare(wdt->clock); + + return 0; +} + +static const struct of_device_id zx2967_wdt_match[] = { + { .compatible = "zte,zx296718-wdt", }, + {} +}; +MODULE_DEVICE_TABLE(of, zx2967_wdt_match); + +static struct platform_driver zx2967_wdt_driver = { + .probe = zx2967_wdt_probe, + .remove = zx2967_wdt_remove, + .driver = { + .name = "zx2967-wdt", + .of_match_table = of_match_ptr(zx2967_wdt_match), + }, +}; +module_platform_driver(zx2967_wdt_driver); + +MODULE_AUTHOR("Baoyou Xie "); +MODULE_DESCRIPTION("ZTE zx2967 Watchdog Device Driver"); +MODULE_LICENSE("GPL v2");