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95d3d353f8
Copy patches from patches-6.1 to patches-6.6. No changes. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
126 lines
3.9 KiB
Diff
126 lines
3.9 KiB
Diff
From 137c9e08e5e542d58aa606b0bb4f0990117309a0 Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Mon, 20 Nov 2023 18:22:31 +0000
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Subject: [PATCH] watchdog: mediatek: mt7988: add wdt support
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Add support for watchdog and reset generator unit of the MediaTek
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MT7988 SoC.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
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Reviewed-by: Guenter Roeck <linux@roeck-us.net>
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Link: https://lore.kernel.org/r/c0cf5f701801cce60470853fa15f1d9dced78c4f.1700504385.git.daniel@makrotopia.org
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Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
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---
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drivers/watchdog/mtk_wdt.c | 42 ++++++++++++++++++++++++++++++++++++++
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1 file changed, 42 insertions(+)
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--- a/drivers/watchdog/mtk_wdt.c
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+++ b/drivers/watchdog/mtk_wdt.c
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@@ -56,9 +56,13 @@
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#define WDT_SWSYSRST 0x18U
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#define WDT_SWSYS_RST_KEY 0x88000000
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+#define WDT_SWSYSRST_EN 0xfc
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+
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#define DRV_NAME "mtk-wdt"
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#define DRV_VERSION "1.0"
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+#define MT7988_TOPRGU_SW_RST_NUM 24
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+
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static bool nowayout = WATCHDOG_NOWAYOUT;
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static unsigned int timeout;
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@@ -68,10 +72,12 @@ struct mtk_wdt_dev {
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spinlock_t lock; /* protects WDT_SWSYSRST reg */
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struct reset_controller_dev rcdev;
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bool disable_wdt_extrst;
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+ bool has_swsysrst_en;
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};
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struct mtk_wdt_data {
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int toprgu_sw_rst_num;
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+ bool has_swsysrst_en;
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};
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static const struct mtk_wdt_data mt2712_data = {
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@@ -82,6 +88,11 @@ static const struct mtk_wdt_data mt7986_
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.toprgu_sw_rst_num = MT7986_TOPRGU_SW_RST_NUM,
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};
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+static const struct mtk_wdt_data mt7988_data = {
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+ .toprgu_sw_rst_num = MT7988_TOPRGU_SW_RST_NUM,
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+ .has_swsysrst_en = true,
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+};
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+
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static const struct mtk_wdt_data mt8183_data = {
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.toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
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};
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@@ -98,6 +109,28 @@ static const struct mtk_wdt_data mt8195_
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.toprgu_sw_rst_num = MT8195_TOPRGU_SW_RST_NUM,
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};
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+/**
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+ * toprgu_reset_sw_en_unlocked() - enable/disable software control for reset bit
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+ * @data: Pointer to instance of driver data.
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+ * @id: Bit number identifying the reset to be enabled or disabled.
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+ * @enable: If true, enable software control for that bit, disable otherwise.
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+ *
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+ * Context: The caller must hold lock of struct mtk_wdt_dev.
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+ */
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+static void toprgu_reset_sw_en_unlocked(struct mtk_wdt_dev *data,
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+ unsigned long id, bool enable)
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+{
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+ u32 tmp;
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+
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+ tmp = readl(data->wdt_base + WDT_SWSYSRST_EN);
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+ if (enable)
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+ tmp |= BIT(id);
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+ else
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+ tmp &= ~BIT(id);
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+
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+ writel(tmp, data->wdt_base + WDT_SWSYSRST_EN);
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+}
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+
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static int toprgu_reset_update(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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@@ -108,6 +141,9 @@ static int toprgu_reset_update(struct re
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spin_lock_irqsave(&data->lock, flags);
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+ if (assert && data->has_swsysrst_en)
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+ toprgu_reset_sw_en_unlocked(data, id, true);
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+
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tmp = readl(data->wdt_base + WDT_SWSYSRST);
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if (assert)
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tmp |= BIT(id);
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@@ -116,6 +152,9 @@ static int toprgu_reset_update(struct re
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tmp |= WDT_SWSYS_RST_KEY;
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writel(tmp, data->wdt_base + WDT_SWSYSRST);
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+ if (!assert && data->has_swsysrst_en)
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+ toprgu_reset_sw_en_unlocked(data, id, false);
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+
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spin_unlock_irqrestore(&data->lock, flags);
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return 0;
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@@ -393,6 +432,8 @@ static int mtk_wdt_probe(struct platform
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wdt_data->toprgu_sw_rst_num);
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if (err)
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return err;
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+
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+ mtk_wdt->has_swsysrst_en = wdt_data->has_swsysrst_en;
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}
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mtk_wdt->disable_wdt_extrst =
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@@ -427,6 +468,7 @@ static const struct of_device_id mtk_wdt
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{ .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
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{ .compatible = "mediatek,mt6589-wdt" },
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{ .compatible = "mediatek,mt7986-wdt", .data = &mt7986_data },
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+ { .compatible = "mediatek,mt7988-wdt", .data = &mt7988_data },
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{ .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
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{ .compatible = "mediatek,mt8186-wdt", .data = &mt8186_data },
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{ .compatible = "mediatek,mt8192-wdt", .data = &mt8192_data },
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