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Date: Wed, 2 Nov 2022 13:59:51 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Eddie James <eajames@...ux.ibm.com>
Cc: linux-watchdog@...r.kernel.org, wim@...ux-watchdog.org,
joel@....id.au, andrew@...id.au, linux-aspeed@...ts.ozlabs.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] watchdog: aspeed: Enable pre-timeout interrupt
On Tue, Nov 01, 2022 at 03:53:37PM -0500, Eddie James wrote:
> Enable the core pre-timeout interrupt on AST2500 and AST2600.
>
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> ---
> drivers/watchdog/aspeed_wdt.c | 104 ++++++++++++++++++++++++++++------
> 1 file changed, 88 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
> index 0cff2adfbfc9..86b5331bc491 100644
> --- a/drivers/watchdog/aspeed_wdt.c
> +++ b/drivers/watchdog/aspeed_wdt.c
> @@ -5,11 +5,14 @@
> * Joel Stanley <joel@....id.au>
> */
>
> +#include <linux/bits.h>
> #include <linux/delay.h>
> +#include <linux/interrupt.h>
> #include <linux/io.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/of_irq.h>
> #include <linux/platform_device.h>
> #include <linux/watchdog.h>
>
> @@ -18,28 +21,41 @@ module_param(nowayout, bool, 0);
> MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
> __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
>
> +struct aspeed_wdt_config {
> + u32 ext_pulse_width_mask;
> + u32 irq_shift;
> + u32 irq_mask;
> +};
> +
> struct aspeed_wdt {
> struct watchdog_device wdd;
> void __iomem *base;
> u32 ctrl;
> -};
> -
> -struct aspeed_wdt_config {
> - u32 ext_pulse_width_mask;
> + const struct aspeed_wdt_config *cfg;
> };
>
> static const struct aspeed_wdt_config ast2400_config = {
> .ext_pulse_width_mask = 0xff,
> + .irq_shift = 0,
> + .irq_mask = 0,
> };
>
> static const struct aspeed_wdt_config ast2500_config = {
> .ext_pulse_width_mask = 0xfffff,
> + .irq_shift = 12,
> + .irq_mask = GENMASK(31, 12),
> +};
> +
> +static const struct aspeed_wdt_config ast2600_config = {
> + .ext_pulse_width_mask = 0xfffff,
> + .irq_shift = 0,
> + .irq_mask = GENMASK(31, 10),
> };
>
> static const struct of_device_id aspeed_wdt_of_table[] = {
> { .compatible = "aspeed,ast2400-wdt", .data = &ast2400_config },
> { .compatible = "aspeed,ast2500-wdt", .data = &ast2500_config },
> - { .compatible = "aspeed,ast2600-wdt", .data = &ast2500_config },
> + { .compatible = "aspeed,ast2600-wdt", .data = &ast2600_config },
> { },
> };
> MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
> @@ -58,6 +74,7 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
> #define WDT_CTRL_RESET_SYSTEM BIT(1)
> #define WDT_CTRL_ENABLE BIT(0)
> #define WDT_TIMEOUT_STATUS 0x10
> +#define WDT_TIMEOUT_STATUS_IRQ BIT(2)
> #define WDT_TIMEOUT_STATUS_BOOT_SECONDARY BIT(1)
> #define WDT_CLEAR_TIMEOUT_STATUS 0x14
> #define WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION BIT(0)
> @@ -160,6 +177,26 @@ static int aspeed_wdt_set_timeout(struct watchdog_device *wdd,
> return 0;
> }
>
> +static int aspeed_wdt_set_pretimeout(struct watchdog_device *wdd,
> + unsigned int pretimeout)
> +{
> + struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
> + u32 actual = pretimeout * WDT_RATE_1MHZ;
> + u32 s = wdt->cfg->irq_shift;
> + u32 m = wdt->cfg->irq_mask;
> +
> + wdd->pretimeout = pretimeout;
> + wdt->ctrl &= ~m;
> + if (pretimeout)
> + wdt->ctrl |= ((actual << s) & m) | WDT_CTRL_WDT_INTR;
> + else
> + wdt->ctrl &= ~WDT_CTRL_WDT_INTR;
> +
> + writel(wdt->ctrl, wdt->base + WDT_CTRL);
> +
> + return 0;
> +}
> +
> static int aspeed_wdt_restart(struct watchdog_device *wdd,
> unsigned long action, void *data)
> {
> @@ -232,6 +269,7 @@ static const struct watchdog_ops aspeed_wdt_ops = {
> .stop = aspeed_wdt_stop,
> .ping = aspeed_wdt_ping,
> .set_timeout = aspeed_wdt_set_timeout,
> + .set_pretimeout = aspeed_wdt_set_pretimeout,
> .restart = aspeed_wdt_restart,
> .owner = THIS_MODULE,
> };
> @@ -243,10 +281,29 @@ static const struct watchdog_info aspeed_wdt_info = {
> .identity = KBUILD_MODNAME,
> };
>
> +static const struct watchdog_info aspeed_wdt_pretimeout_info = {
> + .options = WDIOF_KEEPALIVEPING
> + | WDIOF_PRETIMEOUT
> + | WDIOF_MAGICCLOSE
> + | WDIOF_SETTIMEOUT,
> + .identity = KBUILD_MODNAME,
> +};
> +
> +static irqreturn_t aspeed_wdt_irq(int irq, void *arg)
> +{
> + struct watchdog_device *wdd = arg;
> + struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
> + u32 status = readl(wdt->base + WDT_TIMEOUT_STATUS);
> +
> + if (status & WDT_TIMEOUT_STATUS_IRQ)
> + watchdog_notify_pretimeout(wdd);
> +
> + return IRQ_HANDLED;
> +}
> +
> static int aspeed_wdt_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> - const struct aspeed_wdt_config *config;
> const struct of_device_id *ofdid;
> struct aspeed_wdt *wdt;
> struct device_node *np;
> @@ -259,11 +316,33 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
> if (!wdt)
> return -ENOMEM;
>
> + np = dev->of_node;
> +
> + ofdid = of_match_node(aspeed_wdt_of_table, np);
> + if (!ofdid)
> + return -EINVAL;
> + wdt->cfg = ofdid->data;
> +
> wdt->base = devm_platform_ioremap_resource(pdev, 0);
> if (IS_ERR(wdt->base))
> return PTR_ERR(wdt->base);
>
> wdt->wdd.info = &aspeed_wdt_info;
> +
> + if (wdt->cfg->irq_mask) {
> + int irq = platform_get_irq_optional(pdev, 0);
> +
> + if (irq > 0) {
> + ret = devm_request_irq(dev, irq, aspeed_wdt_irq,
> + IRQF_SHARED, dev_name(dev),
> + wdt);
> + if (ret)
> + return ret;
> +
> + wdt->wdd.info = &aspeed_wdt_pretimeout_info;
> + }
> + }
> +
> wdt->wdd.ops = &aspeed_wdt_ops;
> wdt->wdd.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT_MS;
> wdt->wdd.parent = dev;
> @@ -273,13 +352,6 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
>
> watchdog_set_nowayout(&wdt->wdd, nowayout);
>
> - np = dev->of_node;
> -
> - ofdid = of_match_node(aspeed_wdt_of_table, np);
> - if (!ofdid)
> - return -EINVAL;
> - config = ofdid->data;
> -
> /*
> * On clock rates:
> * - ast2400 wdt can run at PCLK, or 1MHz
> @@ -331,7 +403,7 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
> (of_device_is_compatible(np, "aspeed,ast2600-wdt"))) {
> u32 reg = readl(wdt->base + WDT_RESET_WIDTH);
>
> - reg &= config->ext_pulse_width_mask;
> + reg &= wdt->cfg->ext_pulse_width_mask;
> if (of_property_read_bool(np, "aspeed,ext-active-high"))
> reg |= WDT_ACTIVE_HIGH_MAGIC;
> else
> @@ -339,7 +411,7 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
>
> writel(reg, wdt->base + WDT_RESET_WIDTH);
>
> - reg &= config->ext_pulse_width_mask;
> + reg &= wdt->cfg->ext_pulse_width_mask;
> if (of_property_read_bool(np, "aspeed,ext-push-pull"))
> reg |= WDT_PUSH_PULL_MAGIC;
> else
> @@ -349,7 +421,7 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
> }
>
> if (!of_property_read_u32(np, "aspeed,ext-pulse-duration", &duration)) {
> - u32 max_duration = config->ext_pulse_width_mask + 1;
> + u32 max_duration = wdt->cfg->ext_pulse_width_mask + 1;
>
> if (duration == 0 || duration > max_duration) {
> dev_err(dev, "Invalid pulse duration: %uus\n",
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