[PATCH v1 1/3] watchdog: add ar9344-wdt driver
Oleksij Rempel
linux at rempel-privat.de
Wed Nov 22 07:25:59 PST 2017
Hi Sam,
thank you for review. Next version is on the way.
Am 22.11.2017 um 06:52 schrieb Sam Ravnborg:
> Hi Oleksij.
>
> nitpick mode..
>
> Sam
>
> On Tue, Nov 21, 2017 at 09:04:33PM +0100, Oleksij Rempel wrote:
>> this driver was developed and tested on QCA AR9344 WiSoC
> ^ Capital T
>> but it may work on most know Atheros/QCA WiSoCs.
> ^known
>
>>
>> Signed-off-by: Oleksij Rempel <linux at rempel-privat.de>
>> ---
>> drivers/watchdog/Kconfig | 6 ++
>> drivers/watchdog/Makefile | 1 +
>> drivers/watchdog/ar9344_wdt.c | 136 ++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 143 insertions(+)
>> create mode 100644 drivers/watchdog/ar9344_wdt.c
>>
>> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
>> index 83b6528..1f04c7f 100644
>> --- a/drivers/watchdog/Kconfig
>> +++ b/drivers/watchdog/Kconfig
>> @@ -10,6 +10,12 @@ menuconfig WATCHDOG
>>
>> if WATCHDOG
>>
>> +config WATCHDOG_AR9344
>> + bool "QCA AR9344"
>> + depends on SOC_QCA_AR9344
>> + help
>> + Add support for watchdog on the QCA AR9344 SoC.
>> +
>> config WATCHDOG_DAVINCI
>> bool "TI Davinci"
>> depends on ARCH_DAVINCI
>> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
>> index a3b2667..c607f75 100644
>> --- a/drivers/watchdog/Makefile
>> +++ b/drivers/watchdog/Makefile
>> @@ -1,4 +1,5 @@
>> obj-$(CONFIG_WATCHDOG) += wd_core.o
>> +obj-$(CONFIG_WATCHDOG_AR9344) += ar9344_wdt.o
>> obj-$(CONFIG_WATCHDOG_DAVINCI) += davinci_wdt.o
>> obj-$(CONFIG_WATCHDOG_OMAP) += omap_wdt.o
>> obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o
>> diff --git a/drivers/watchdog/ar9344_wdt.c b/drivers/watchdog/ar9344_wdt.c
>> new file mode 100644
>> index 0000000..1f44604
>> --- /dev/null
>> +++ b/drivers/watchdog/ar9344_wdt.c
>> @@ -0,0 +1,136 @@
>> +/*
>> + * AR9344 Watchdog driver
>> + *
>> + * Copyright (C) 2017 Oleksij Rempel <linux at rempel-privat.de>
>> + *
>> + * 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.
>> + *
>> + */
>> +
>> +#include <common.h>
>> +#include <errno.h>
>> +#include <init.h>
>> +#include <io.h>
>> +#include <linux/clk.h>
>> +#include <of.h>
>> +#include <reset_source.h>
>> +#include <watchdog.h>
>> +
>> +#define AR9344_WD_REG_CTRL 0x00
>> +#define AR9344_WD_CTRL_LAST_RESET BIT(31)
>> +#define AR9344_WD_CTRL_ACTION_MASK 3
>> +#define AR9344_WD_CTRL_ACTION_NONE 0 /* no action */
>> +#define AR9344_WD_CTRL_ACTION_GPI 1 /* general purpose interrupt */
>> +#define AR9344_WD_CTRL_ACTION_NMI 2 /* NMI */
>> +#define AR9344_WD_CTRL_ACTION_FCR 3 /* full chip reset */
>> +
>> +#define AR9344_WD_REG_TIMER 0x04
>> +
>> +#define to_ar9344_wd(h) container_of(h, struct ar9344_wd, wd)
>> +
>> +struct ar9344_wd {
>> + struct watchdog wd;
>> + void __iomem *base;
>> + struct clk *clk;
>> + struct device_d *dev;
>> +};
>> +
>> +static int ar9344_watchdog_set_timeout(struct watchdog *wd, unsigned timeout)
>> +{
>> + struct ar9344_wd *priv = (struct ar9344_wd *)to_ar9344_wd(wd);
> Is this cast necessary when container_of is used?
> I did not think, but I think not.
>
>> + u32 val, ctrl, rate, max_timout;
>> +
>> + rate = clk_get_rate(priv->clk);
>> + max_timout = U32_MAX / rate;
>> +
>> + if (timeout > max_timout) {
>> + dev_err(priv->dev, "timeout value out of range: %d > %d\n",
>> + timeout, max_timout);
>> + return -EINVAL;
>> + }
>> +
>> + if (timeout) {
>> + ctrl = AR9344_WD_CTRL_ACTION_FCR;
>> + val = timeout * rate;
>> + } else {
>> + ctrl = AR9344_WD_CTRL_ACTION_NONE;
>> + val = U32_MAX;
>> + }
>> +
>> + dev_dbg(priv->dev, "%s: %d, timer:%x, ctrl: %x \n", __func__,
>> + timeout, val, ctrl);
>> +
>> + iowrite32be(val, priv->base + AR9344_WD_REG_TIMER);
>> + iowrite32be(ctrl, priv->base + AR9344_WD_REG_CTRL);
>> +
>> + return 0;
>> +}
>> +
>> +static void ar9344_watchdog_detect_reset_source(struct ar9344_wd *priv)
>> +{
>> + u32 val = readw(priv->base + AR9344_WD_REG_CTRL);
>> +
>> + if (val & AR9344_WD_CTRL_LAST_RESET)
>> + reset_source_set(RESET_WDG);
>> +
>> + /* else keep the default 'unknown' state */
>> +}
>> +
>> +static int ar9344_wdt_probe(struct device_d *dev)
>> +{
>> + struct resource *iores;
>> + struct ar9344_wd *priv;
>> + int ret;
>> +
>> + priv = xzalloc(sizeof(struct ar9344_wd));
>> + iores = dev_request_mem_resource(dev, 0);
>> + if (IS_ERR(iores)) {
>> + dev_err(dev, "could not get memory region\n");
>> + return PTR_ERR(iores);
> priv is not released is this error situation.
>
>> + }
>> +
>> + priv->base = IOMEM(iores->start);
>> + priv->wd.set_timeout = ar9344_watchdog_set_timeout;
>> + priv->wd.dev = dev;
>> + priv->dev = dev;
>> +
>> + dev->priv = priv;
>> +
>> + ar9344_watchdog_detect_reset_source(priv);
>> +
>> + priv->clk = clk_get(dev, NULL);
>> + if (WARN_ON(IS_ERR(priv->clk))) {
> dev_err - to log what is wrong?
>
>> + ret = PTR_ERR(priv->clk);
>> + goto on_error;
>> + }
>> +
>> + clk_enable(priv->clk);
>> +
>> + ret = watchdog_register(&priv->wd);
>> + if (ret)
>> + goto on_error;
>> +
>> + return 0;
>> +
>> +on_error:
>> + free(priv);
>> + return ret;
>> +}
>> +
>> +static __maybe_unused struct of_device_id ar9344_wdt_dt_ids[] = {
>> + {
>> + .compatible = "qca,ar9344-wdt",
>> + }, {
>> + /* sentinel */
>> + }
>> +};
>> +
>> +static struct driver_d ar9344_wdt_driver = {
>> + .name = "ar9344-wdt",
>> + .probe = ar9344_wdt_probe,
>> + .of_compatible = DRV_OF_COMPAT(ar9344_wdt_dt_ids),
>> +};
>> +device_platform_driver(ar9344_wdt_driver);
>> --
>> 2.7.4
>>
>>
>> _______________________________________________
>> barebox mailing list
>> barebox at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/barebox
--
Regards,
Oleksij
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 213 bytes
Desc: OpenPGP digital signature
URL: <http://lists.infradead.org/pipermail/barebox/attachments/20171122/890d61b1/attachment.sig>
More information about the barebox
mailing list