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Date:   Sun, 31 Oct 2021 14:22:16 +0200
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PATCH v2 12/12] watchdog: s3c2410: Add Exynos850 support

Exynos850 is a bit different from SoCs already supported in WDT driver:
  - AUTOMATIC_WDT_RESET_DISABLE register is removed, so its value is
    always 0; .disable_auto_reset callback is not set for that reason
  - MASK_WDT_RESET_REQUEST register is replaced with
    CLUSTERx_NONCPU_IN_EN register; instead of masking (disabling) WDT
    reset interrupt it's now enabled with the same value; .mask_reset
    callback is reused for that functionality though
  - To make WDT functional, WDT counter needs to be enabled in
    CLUSTERx_NONCPU_OUT register; it's done using .enable_counter
    callback

Also Exynos850 has two CPU clusters, each has its own dedicated WDT
instance. Different PMU registers and bits are used for each cluster. So
driver data is now modified in probe, adding needed info depending on
cluster index passed from device tree.

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
Changes in v2:
  - Used single compatible for Exynos850, populating missing driver data in
    probe
  - Added "index" property to specify CPU cluster index

 drivers/watchdog/s3c2410_wdt.c | 68 +++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 8fdda2ede1c3..457b725c30ac 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -56,6 +56,14 @@
 #define EXYNOS5_RST_STAT_REG_OFFSET		0x0404
 #define EXYNOS5_WDT_DISABLE_REG_OFFSET		0x0408
 #define EXYNOS5_WDT_MASK_RESET_REG_OFFSET	0x040c
+#define EXYNOS850_CLUSTER0_NONCPU_OUT		0x1220
+#define EXYNOS850_CLUSTER0_NONCPU_INT_EN	0x1244
+#define EXYNOS850_CLUSTER1_NONCPU_OUT		0x1620
+#define EXYNOS850_CLUSTER1_NONCPU_INT_EN	0x1644
+
+#define EXYNOS850_CLUSTER0_WDTRESET_BIT		24
+#define EXYNOS850_CLUSTER1_WDTRESET_BIT		23
+
 #define QUIRK_HAS_WTCLRINT_REG			(1 << 0)
 #define QUIRK_HAS_PMU_MASK_RESET		(1 << 1)
 #define QUIRK_HAS_PMU_RST_STAT			(1 << 2)
@@ -171,6 +179,21 @@ static const struct s3c2410_wdt_variant drv_data_exynos7 = {
 		  QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_AUTO_DISABLE,
 };
 
+static const struct s3c2410_wdt_variant drv_data_exynos850 = {
+	/*
+	 * Next fields will be set in probe(), based on cluster index:
+	 *   - .mask_reset_reg
+	 *   - .rst_stat_bit
+	 *   - .cnt_en_reg
+	 */
+	.mask_reset_inv = true,
+	.mask_bit = 2,
+	.rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
+	.cnt_en_bit = 7,
+	.quirks = QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_PMU_MASK_RESET | \
+		  QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_CNT_EN,
+};
+
 static const struct of_device_id s3c2410_wdt_match[] = {
 	{ .compatible = "samsung,s3c2410-wdt",
 	  .data = &drv_data_s3c2410 },
@@ -182,6 +205,8 @@ static const struct of_device_id s3c2410_wdt_match[] = {
 	  .data = &drv_data_exynos5420 },
 	{ .compatible = "samsung,exynos7-wdt",
 	  .data = &drv_data_exynos7 },
+	{ .compatible = "samsung,exynos850-wdt",
+	  .data = &drv_data_exynos850 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
@@ -548,15 +573,51 @@ static inline const struct s3c2410_wdt_variant *
 s3c2410_get_wdt_drv_data(struct platform_device *pdev)
 {
 	const struct s3c2410_wdt_variant *variant;
+	struct s3c2410_wdt_variant *data;
+	struct device *dev = &pdev->dev;
 
-	variant = of_device_get_match_data(&pdev->dev);
+	variant = of_device_get_match_data(dev);
 	if (!variant) {
 		/* Device matched by platform_device_id */
 		variant = (struct s3c2410_wdt_variant *)
 			   platform_get_device_id(pdev)->driver_data;
 	}
 
-	return variant;
+	/* Have to copy driver data over to keep its const qualifier intact */
+	data = devm_kmemdup(dev, variant, sizeof(*variant), GFP_KERNEL);
+	if (!data)
+		return NULL;
+
+	/* Populate missing fields for Exynos850 w.r.t. cluster index */
+	if (variant == &drv_data_exynos850) {
+		u32 index;
+		int err;
+
+		err = of_property_read_u32(dev->of_node, "samsung,index",
+					   &index);
+		if (err) {
+			dev_err(dev, "failed to get cluster index\n");
+			return NULL;
+		}
+
+		switch (index) {
+		case 0:
+			data->mask_reset_reg = EXYNOS850_CLUSTER0_NONCPU_INT_EN;
+			data->rst_stat_bit = EXYNOS850_CLUSTER0_WDTRESET_BIT;
+			data->cnt_en_reg = EXYNOS850_CLUSTER0_NONCPU_OUT;
+			break;
+		case 1:
+			data->mask_reset_reg = EXYNOS850_CLUSTER1_NONCPU_INT_EN;
+			data->rst_stat_bit = EXYNOS850_CLUSTER1_WDTRESET_BIT;
+			data->cnt_en_reg = EXYNOS850_CLUSTER1_NONCPU_OUT;
+			break;
+		default:
+			dev_err(dev, "wrong cluster index: %u\n", index);
+			return NULL;
+		}
+	}
+
+	return data;
 }
 
 static int s3c2410wdt_probe(struct platform_device *pdev)
@@ -576,6 +637,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 	wdt->wdt_device = s3c2410_wdd;
 
 	wdt->drv_data = s3c2410_get_wdt_drv_data(pdev);
+	if (!wdt->drv_data)
+		return -EINVAL;
+
 	if (wdt->drv_data->quirks & QUIRKS_HAVE_PMUREG) {
 		wdt->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
 						"samsung,syscon-phandle");
-- 
2.30.2

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