From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TK5Aa-0003g9-Hz for barebox@lists.infradead.org; Fri, 05 Oct 2012 10:30:13 +0000 From: Sascha Hauer Date: Fri, 5 Oct 2012 12:29:58 +0200 Message-Id: <1349433000-1320-2-git-send-email-s.hauer@pengutronix.de> In-Reply-To: <1349433000-1320-1-git-send-email-s.hauer@pengutronix.de> References: <1349433000-1320-1-git-send-email-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/3] watchdog: Add i.MX watchdog support To: barebox@lists.infradead.org This adds a driver for the watchdog found on i.MX1-i.MX6. Signed-off-by: Sascha Hauer --- drivers/watchdog/Kconfig | 6 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/imxwd.c | 180 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 187 insertions(+) create mode 100644 drivers/watchdog/imxwd.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 8fdc7a5..645b5c7 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -12,4 +12,10 @@ config WATCHDOG_MXS28 help Add support for watchdog management for the i.MX28 SoC. +config WATCHDOG_IMX + bool "i.MX watchdog" + depends on ARCH_IMX + help + Add support for watchdog found on Freescale i.MX SoCs. + endif diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index b29103b..e655454 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_WATCHDOG) += wd_core.o obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o +obj-$(CONFIG_WATCHDOG_IMX) += imxwd.o diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c new file mode 100644 index 0000000..43e4803 --- /dev/null +++ b/drivers/watchdog/imxwd.c @@ -0,0 +1,180 @@ +/* + * (c) 2012 Sascha Hauer + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include + +struct imx_wd { + struct watchdog wd; + void __iomem *base; + struct device_d *dev; + int (*set_timeout)(struct imx_wd *, unsigned); +}; + +#define to_imx_wd(h) container_of(h, struct imx_wd, wd) + +#define IMX1_WDOG_WCR 0x00 /* Watchdog Control Register */ +#define IMX1_WDOG_WSR 0x04 /* Watchdog Service Register */ +#define IMX1_WDOG_WSTR 0x08 /* Watchdog Status Register */ +#define IMX1_WDOG_WCR_WDE (1 << 0) +#define IMX1_WDOG_WCR_WHALT (1 << 15) + +#define IMX21_WDOG_WCR 0x00 /* Watchdog Control Register */ +#define IMX21_WDOG_WSR 0x02 /* Watchdog Service Register */ +#define IMX21_WDOG_WSTR 0x04 /* Watchdog Status Register */ +#define IMX21_WDOG_WCR_WDE (1 << 2) +#define IMX21_WDOG_WCR_SRS (1 << 4) +#define IMX21_WDOG_WCR_WDA (1 << 5) + +static int imx1_watchdog_set_timeout(struct imx_wd *priv, int timeout) +{ + u16 val; + + dev_dbg(priv->dev, "%s: %d\n", __func__, timeout); + + if (timeout > 64) + return -EINVAL; + + if (!timeout) { + writew(IMX1_WDOG_WCR_WHALT, priv->base + IMX1_WDOG_WCR); + return 0; + } + + if (timeout > 0) + val = (timeout * 2 - 1) << 8; + else + val = 0; + + writew(val, priv->base + IMX1_WDOG_WCR); + writew(IMX1_WDOG_WCR_WDE | val, priv->base + IMX1_WDOG_WCR); + + /* Write Service Sequence */ + writew(0x5555, priv->base + IMX1_WDOG_WSR); + writew(0xaaaa, priv->base + IMX1_WDOG_WSR); + + return 0; +} + +static int imx21_watchdog_set_timeout(struct imx_wd *priv, int timeout) +{ + u16 val; + + dev_dbg(priv->dev, "%s: %d\n", __func__, timeout); + + if (!timeout || timeout > 128) + return -EINVAL; + + if (timeout > 0) + val = ((timeout * 2 - 1) << 8) | IMX21_WDOG_WCR_SRS | + IMX21_WDOG_WCR_WDA; + else + val = 0; + + writew(val, priv->base + IMX21_WDOG_WCR); + writew(IMX21_WDOG_WCR_WDE | val, priv->base + IMX21_WDOG_WCR); + + /* Write Service Sequence */ + writew(0x5555, priv->base + IMX21_WDOG_WSR); + writew(0xaaaa, priv->base + IMX21_WDOG_WSR); + + return 0; +} + +static int imx_watchdog_set_timeout(struct watchdog *wd, unsigned timeout) +{ + struct imx_wd *priv = (struct imx_wd *)to_imx_wd(wd); + + return priv->set_timeout(priv, timeout); +} + +static int imx_wd_probe(struct device_d *dev) +{ + struct imx_wd *priv; + void *fn; + int ret; + + ret = dev_get_drvdata(dev, (unsigned long *)&fn); + if (ret) + return ret; + + priv = xzalloc(sizeof(struct imx_wd)); + priv->base = dev_request_mem_region(dev, 0); + priv->set_timeout = fn; + priv->wd.set_timeout = imx_watchdog_set_timeout; + priv->dev = dev; + + ret = watchdog_register(&priv->wd); + if (ret) + goto on_error; + + dev->priv = priv; + + return 0; + +on_error: + free(priv); + return ret; +} + +static void imx_wd_remove(struct device_d *dev) +{ + struct imx_wd *priv = dev->priv; + + watchdog_deregister(&priv->wd); + free(priv); +} + +static __maybe_unused struct of_device_id imx_wdt_dt_ids[] = { + { + .compatible = "fsl,imx1-wdt", + .data = (unsigned long)&imx1_watchdog_set_timeout, + }, { + .compatible = "fsl,imx21-wdt", + .data = (unsigned long)&imx21_watchdog_set_timeout, + }, { + /* sentinel */ + } +}; + +static struct platform_device_id imx_wdt_ids[] = { + { + .name = "imx1-wdt", + .driver_data = (unsigned long)&imx1_watchdog_set_timeout, + }, { + .name = "imx21-wdt", + .driver_data = (unsigned long)&imx21_watchdog_set_timeout, + }, { + /* sentinel */ + }, +}; + +static struct driver_d imx_wd_driver = { + .name = "imx-watchdog", + .probe = imx_wd_probe, + .remove = imx_wd_remove, + .of_compatible = DRV_OF_COMPAT(imx_wdt_dt_ids), + .id_table = imx_wdt_ids, +}; + +static int imx_wd_init(void) +{ + return platform_driver_register(&imx_wd_driver); +} + +device_initcall(imx_wd_init); -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox