target/linux/mediatek/patches-6.6/251-v6.8-watchdog-mediatek-mt7988-add-wdt-support.patch

   1 From 137c9e08e5e542d58aa606b0bb4f0990117309a0 Mon Sep 17 00:00:00 2001
   2 From: Daniel Golle <daniel@makrotopia.org>
   3 Date: Mon, 20 Nov 2023 18:22:31 +0000
   4 Subject: [PATCH] watchdog: mediatek: mt7988: add wdt support
   5
   6 Add support for watchdog and reset generator unit of the MediaTek
   7 MT7988 SoC.
   8
   9 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  10 Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
  11 Reviewed-by: Guenter Roeck <linux@roeck-us.net>
  12 Link: https://lore.kernel.org/r/c0cf5f701801cce60470853fa15f1d9dced78c4f.1700504385.git.daniel@makrotopia.org
  13 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
  14 Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
  15 ---
  16  drivers/watchdog/mtk_wdt.c | 42 ++++++++++++++++++++++++++++++++++++++
  17  1 file changed, 42 insertions(+)
  18
  19 --- a/drivers/watchdog/mtk_wdt.c
  20 +++ b/drivers/watchdog/mtk_wdt.c
  21 @@ -56,9 +56,13 @@
  22  #define WDT_SWSYSRST           0x18U
  23  #define WDT_SWSYS_RST_KEY      0x88000000
  24
  25 +#define WDT_SWSYSRST_EN                0xfc
  26 +
  27  #define DRV_NAME               "mtk-wdt"
  28  #define DRV_VERSION            "1.0"
  29
  30 +#define MT7988_TOPRGU_SW_RST_NUM       24
  31 +
  32  static bool nowayout = WATCHDOG_NOWAYOUT;
  33  static unsigned int timeout;
  34
  35 @@ -68,10 +72,12 @@ struct mtk_wdt_dev {
  36         spinlock_t lock; /* protects WDT_SWSYSRST reg */
  37         struct reset_controller_dev rcdev;
  38         bool disable_wdt_extrst;
  39 +       bool has_swsysrst_en;
  40  };
  41
  42  struct mtk_wdt_data {
  43         int toprgu_sw_rst_num;
  44 +       bool has_swsysrst_en;
  45  };
  46
  47  static const struct mtk_wdt_data mt2712_data = {
  48 @@ -82,6 +88,11 @@ static const struct mtk_wdt_data mt7986_
  49         .toprgu_sw_rst_num = MT7986_TOPRGU_SW_RST_NUM,
  50  };
  51
  52 +static const struct mtk_wdt_data mt7988_data = {
  53 +       .toprgu_sw_rst_num = MT7988_TOPRGU_SW_RST_NUM,
  54 +       .has_swsysrst_en = true,
  55 +};
  56 +
  57  static const struct mtk_wdt_data mt8183_data = {
  58         .toprgu_sw_rst_num = MT8183_TOPRGU_SW_RST_NUM,
  59  };
  60 @@ -98,6 +109,28 @@ static const struct mtk_wdt_data mt8195_
  61         .toprgu_sw_rst_num = MT8195_TOPRGU_SW_RST_NUM,
  62  };
  63
  64 +/**
  65 + * toprgu_reset_sw_en_unlocked() - enable/disable software control for reset bit
  66 + * @data: Pointer to instance of driver data.
  67 + * @id: Bit number identifying the reset to be enabled or disabled.
  68 + * @enable: If true, enable software control for that bit, disable otherwise.
  69 + *
  70 + * Context: The caller must hold lock of struct mtk_wdt_dev.
  71 + */
  72 +static void toprgu_reset_sw_en_unlocked(struct mtk_wdt_dev *data,
  73 +                                       unsigned long id, bool enable)
  74 +{
  75 +       u32 tmp;
  76 +
  77 +       tmp = readl(data->wdt_base + WDT_SWSYSRST_EN);
  78 +       if (enable)
  79 +               tmp |= BIT(id);
  80 +       else
  81 +               tmp &= ~BIT(id);
  82 +
  83 +       writel(tmp, data->wdt_base + WDT_SWSYSRST_EN);
  84 +}
  85 +
  86  static int toprgu_reset_update(struct reset_controller_dev *rcdev,
  87                                unsigned long id, bool assert)
  88  {
  89 @@ -108,6 +141,9 @@ static int toprgu_reset_update(struct re
  90
  91         spin_lock_irqsave(&data->lock, flags);
  92
  93 +       if (assert && data->has_swsysrst_en)
  94 +               toprgu_reset_sw_en_unlocked(data, id, true);
  95 +
  96         tmp = readl(data->wdt_base + WDT_SWSYSRST);
  97         if (assert)
  98                 tmp |= BIT(id);
  99 @@ -116,6 +152,9 @@ static int toprgu_reset_update(struct re
 100         tmp |= WDT_SWSYS_RST_KEY;
 101         writel(tmp, data->wdt_base + WDT_SWSYSRST);
 102
 103 +       if (!assert && data->has_swsysrst_en)
 104 +               toprgu_reset_sw_en_unlocked(data, id, false);
 105 +
 106         spin_unlock_irqrestore(&data->lock, flags);
 107
 108         return 0;
 109 @@ -393,6 +432,8 @@ static int mtk_wdt_probe(struct platform
 110                                                        wdt_data->toprgu_sw_rst_num);
 111                 if (err)
 112                         return err;
 113 +
 114 +               mtk_wdt->has_swsysrst_en = wdt_data->has_swsysrst_en;
 115         }
 116
 117         mtk_wdt->disable_wdt_extrst =
 118 @@ -427,6 +468,7 @@ static const struct of_device_id mtk_wdt
 119         { .compatible = "mediatek,mt2712-wdt", .data = &mt2712_data },
 120         { .compatible = "mediatek,mt6589-wdt" },
 121         { .compatible = "mediatek,mt7986-wdt", .data = &mt7986_data },
 122 +       { .compatible = "mediatek,mt7988-wdt", .data = &mt7988_data },
 123         { .compatible = "mediatek,mt8183-wdt", .data = &mt8183_data },
 124         { .compatible = "mediatek,mt8186-wdt", .data = &mt8186_data },
 125         { .compatible = "mediatek,mt8192-wdt", .data = &mt8192_data },