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Message-ID: <1556806126-15890-4-git-send-email-ludovic.Barre@st.com>
Date: Thu, 2 May 2019 16:08:46 +0200
From: Ludovic Barre <ludovic.Barre@...com>
To: Wim Van Sebroeck <wim@...ux-watchdog.org>,
Guenter Roeck <linux@...ck-us.net>,
Rob Herring <robh+dt@...nel.org>
CC: Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...com>,
<linux-watchdog@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH V2 3/3] watchdog: stm32: add dynamic prescaler support
From: Ludovic Barre <ludovic.barre@...com>
This patch allows to define the max prescaler by compatible.
To set a large range of timeout, the prescaler should be set
dynamically (from the timeout request) to improve the resolution
in order to have a timeout close to the expected value.
Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
drivers/watchdog/stm32_iwdg.c | 76 ++++++++++++++++++++++++-------------------
1 file changed, 42 insertions(+), 34 deletions(-)
diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c
index f19a6d4..0c765d4 100644
--- a/drivers/watchdog/stm32_iwdg.c
+++ b/drivers/watchdog/stm32_iwdg.c
@@ -34,18 +34,12 @@
#define KR_KEY_EWA 0x5555 /* write access enable */
#define KR_KEY_DWA 0x0000 /* write access disable */
-/* IWDG_PR register bit values */
-#define PR_4 0x00 /* prescaler set to 4 */
-#define PR_8 0x01 /* prescaler set to 8 */
-#define PR_16 0x02 /* prescaler set to 16 */
-#define PR_32 0x03 /* prescaler set to 32 */
-#define PR_64 0x04 /* prescaler set to 64 */
-#define PR_128 0x05 /* prescaler set to 128 */
-#define PR_256 0x06 /* prescaler set to 256 */
+#define PR_SHIFT 2
+#define PR_MIN BIT(PR_SHIFT)
/* IWDG_RLR register values */
-#define RLR_MIN 0x07C /* min value supported by reload register */
-#define RLR_MAX 0xFFF /* max value supported by reload register */
+#define RLR_MIN 0x2 /* min value recommended */
+#define RLR_MAX GENMASK(11, 0) /* max value of reload register */
/* IWDG_SR register bit mask */
#define FLAG_PVU BIT(0) /* Watchdog prescaler value update */
@@ -55,15 +49,28 @@
#define TIMEOUT_US 100000
#define SLEEP_US 1000
-#define HAS_PCLK true
+struct stm32_iwdg_data {
+ bool has_pclk;
+ u32 max_prescaler;
+};
+
+static const struct stm32_iwdg_data stm32_iwdg_data = {
+ .has_pclk = false,
+ .max_prescaler = 256,
+};
+
+static const struct stm32_iwdg_data stm32mp1_iwdg_data = {
+ .has_pclk = true,
+ .max_prescaler = 1024,
+};
struct stm32_iwdg {
struct watchdog_device wdd;
+ const struct stm32_iwdg_data *data;
void __iomem *regs;
struct clk *clk_lsi;
struct clk *clk_pclk;
unsigned int rate;
- bool has_pclk;
};
static inline u32 reg_read(void __iomem *base, u32 reg)
@@ -79,26 +86,28 @@ static inline void reg_write(void __iomem *base, u32 reg, u32 val)
static int stm32_iwdg_start(struct watchdog_device *wdd)
{
struct stm32_iwdg *wdt = watchdog_get_drvdata(wdd);
- u32 val = FLAG_PVU | FLAG_RVU;
- u32 reload;
+ u32 presc, iwdg_rlr, iwdg_pr, iwdg_sr;
dev_dbg(wdd->parent, "%s\n", __func__);
- /* prescaler fixed to 256 */
- reload = clamp_t(unsigned int, ((wdd->timeout * wdt->rate) / 256) - 1,
- RLR_MIN, RLR_MAX);
+ presc = DIV_ROUND_UP(wdd->timeout * wdt->rate, RLR_MAX + 1);
+
+ /* The prescaler is align on power of 2 and start at 2 ^ PR_SHIFT. */
+ presc = roundup_pow_of_two(presc);
+ iwdg_pr = presc <= 1 << PR_SHIFT ? 0 : ilog2(presc) - PR_SHIFT;
+ iwdg_rlr = ((wdd->timeout * wdt->rate) / presc) - 1;
+ /* enable watchdog */
+ reg_write(wdt->regs, IWDG_KR, KR_KEY_ENABLE);
/* enable write access */
reg_write(wdt->regs, IWDG_KR, KR_KEY_EWA);
-
/* set prescaler & reload registers */
- reg_write(wdt->regs, IWDG_PR, PR_256); /* prescaler fix to 256 */
- reg_write(wdt->regs, IWDG_RLR, reload);
- reg_write(wdt->regs, IWDG_KR, KR_KEY_ENABLE);
+ reg_write(wdt->regs, IWDG_PR, iwdg_pr);
+ reg_write(wdt->regs, IWDG_RLR, iwdg_rlr);
/* wait for the registers to be updated (max 100ms) */
- if (readl_relaxed_poll_timeout(wdt->regs + IWDG_SR, val,
- !(val & (FLAG_PVU | FLAG_RVU)),
+ if (readl_relaxed_poll_timeout(wdt->regs + IWDG_SR, iwdg_sr,
+ !(iwdg_sr & (FLAG_PVU | FLAG_RVU)),
SLEEP_US, TIMEOUT_US)) {
dev_err(wdd->parent, "Fail to set prescaler, reload regs\n");
return -EIO;
@@ -155,7 +164,7 @@ static int stm32_iwdg_clk_init(struct platform_device *pdev,
}
/* optional peripheral clock */
- if (wdt->has_pclk) {
+ if (wdt->data->has_pclk) {
wdt->clk_pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(wdt->clk_pclk)) {
dev_err(&pdev->dev, "Unable to get pclk clock\n");
@@ -196,8 +205,8 @@ static const struct watchdog_ops stm32_iwdg_ops = {
};
static const struct of_device_id stm32_iwdg_of_match[] = {
- { .compatible = "st,stm32-iwdg", .data = (void *)!HAS_PCLK },
- { .compatible = "st,stm32mp1-iwdg", .data = (void *)HAS_PCLK },
+ { .compatible = "st,stm32-iwdg", .data = &stm32_iwdg_data },
+ { .compatible = "st,stm32mp1-iwdg", .data = &stm32mp1_iwdg_data },
{ /* end node */ }
};
MODULE_DEVICE_TABLE(of, stm32_iwdg_of_match);
@@ -205,20 +214,17 @@ MODULE_DEVICE_TABLE(of, stm32_iwdg_of_match);
static int stm32_iwdg_probe(struct platform_device *pdev)
{
struct watchdog_device *wdd;
- const struct of_device_id *match;
struct stm32_iwdg *wdt;
struct resource *res;
int ret;
- match = of_match_device(stm32_iwdg_of_match, &pdev->dev);
- if (!match)
- return -ENODEV;
-
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
- wdt->has_pclk = match->data;
+ wdt->data = of_device_get_match_data(&pdev->dev);
+ if (!wdt->data)
+ return -ENODEV;
/* This is the timer base. */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -236,8 +242,10 @@ static int stm32_iwdg_probe(struct platform_device *pdev)
wdd = &wdt->wdd;
wdd->info = &stm32_iwdg_info;
wdd->ops = &stm32_iwdg_ops;
- wdd->min_timeout = ((RLR_MIN + 1) * 256) / wdt->rate;
- wdd->max_hw_heartbeat_ms = ((RLR_MAX + 1) * 256 * 1000) / wdt->rate;
+ wdd->min_timeout = max_t(unsigned int, 1,
+ (((RLR_MIN + 1) * PR_MIN) / wdt->rate));
+ wdd->max_hw_heartbeat_ms = ((RLR_MAX + 1) * wdt->data->max_prescaler *
+ 1000) / wdt->rate;
wdd->parent = &pdev->dev;
watchdog_set_drvdata(wdd, wdt);
--
2.7.4
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