diff options
| author | Daniel Golle <daniel@makrotopia.org> | 2023-11-20 18:22:31 +0000 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2023-12-17 16:14:23 +0100 |
| commit | 137c9e08e5e542d58aa606b0bb4f0990117309a0 (patch) | |
| tree | da3389736175db7e74ac1e95208ee1581945d516 /drivers | |
| parent | a4d2116ee1df93bbb210466b77d63feb3fbb7b78 (diff) | |
watchdog: mediatek: mt7988: add wdt support
Add support for watchdog and reset generator unit of the MediaTek
MT7988 SoC.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/c0cf5f701801cce60470853fa15f1d9dced78c4f.1700504385.git.daniel@makrotopia.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/watchdog/mtk_wdt.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c index b2330b16b497..c35f85ce8d69 100644 --- a/drivers/watchdog/mtk_wdt.c +++ b/drivers/watchdog/mtk_wdt.c @@ -58,9 +58,13 @@ #define WDT_SWSYSRST 0x18U #define WDT_SWSYS_RST_KEY 0x88000000 +#define WDT_SWSYSRST_EN 0xfc + #define DRV_NAME "mtk-wdt" #define DRV_VERSION "1.0" +#define MT7988_TOPRGU_SW_RST_NUM 24 + static bool nowayout = WATCHDOG_NOWAYOUT; static unsigned int timeout; @@ -71,10 +75,12 @@ struct mtk_wdt_dev { struct reset_controller_dev rcdev; bool disable_wdt_extrst; bool reset_by_toprgu; + bool has_swsysrst_en; }; struct mtk_wdt_data { int toprgu_sw_rst_num; + bool has_swsysrst_en; }; static const struct mtk_wdt_data mt2712_data = { @@ -89,6 +95,11 @@ static const struct mtk_wdt_data mt7986_data = { .toprgu_sw_rst_num = MT7986_TOPRGU_SW_RST_NUM, }; +static const struct mtk_wdt_data mt7988_data = { + .toprgu_sw_rst_num = MT7988_TOPRGU_SW_RST_NUM, + .has_swsysrst_en = true, +}; + static const struct mtk_wdt_data mt8183_data = { .toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM, }; @@ -109,6 +120,28 @@ static const struct mtk_wdt_data mt8195_data = { .toprgu_sw_rst_num = MT8195_TOPRGU_SW_RST_NUM, }; +/** + * toprgu_reset_sw_en_unlocked() - enable/disable software control for reset bit + * @data: Pointer to instance of driver data. + * @id: Bit number identifying the reset to be enabled or disabled. + * @enable: If true, enable software control for that bit, disable otherwise. + * + * Context: The caller must hold lock of struct mtk_wdt_dev. + */ +static void toprgu_reset_sw_en_unlocked(struct mtk_wdt_dev *data, + unsigned long id, bool enable) +{ + u32 tmp; + + tmp = readl(data->wdt_base + WDT_SWSYSRST_EN); + if (enable) + tmp |= BIT(id); + else + tmp &= ~BIT(id); + + writel(tmp, data->wdt_base + WDT_SWSYSRST_EN); +} + static int toprgu_reset_update(struct reset_controller_dev *rcdev, unsigned long id, bool assert) { @@ -119,6 +152,9 @@ static int toprgu_reset_update(struct reset_controller_dev *rcdev, spin_lock_irqsave(&data->lock, flags); + if (assert && data->has_swsysrst_en) + toprgu_reset_sw_en_unlocked(data, id, true); + tmp = readl(data->wdt_base + WDT_SWSYSRST); if (assert) tmp |= BIT(id); @@ -127,6 +163,9 @@ static int toprgu_reset_update(struct reset_controller_dev *rcdev, tmp |= WDT_SWSYS_RST_KEY; writel(tmp, data->wdt_base + WDT_SWSYSRST); + if (!assert && data->has_swsysrst_en) + toprgu_reset_sw_en_unlocked(data, id, false); + spin_unlock_irqrestore(&data->lock, flags); return 0; @@ -406,6 +445,8 @@ static int mtk_wdt_probe(struct platform_device *pdev) wdt_data->toprgu_sw_rst_num); if (err) return err; + + mtk_wdt->has_swsysrst_en = wdt_data->has_swsysrst_en; } mtk_wdt->disable_wdt_extrst = @@ -444,6 +485,7 @@ static const struct of_device_id mtk_wdt_dt_ids[] = { { .compatible = "mediatek,mt6589-wdt" }, { .compatible = "mediatek,mt6795-wdt", .data = &mt6795_data }, { .compatible = "mediatek,mt7986-wdt", .data = &mt7986_data }, + { .compatible = "mediatek,mt7988-wdt", .data = &mt7988_data }, { .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data }, { .compatible = "mediatek,mt8186-wdt", .data = &mt8186_data }, { .compatible = "mediatek,mt8188-wdt", .data = &mt8188_data }, |