git.openwrt.org Git - openwrt/openwrt.git/blob

   1 From 000de5417107623925a4cf0310579f744ff43c28 Mon Sep 17 00:00:00 2001
   2 From: Ansuel Smith <ansuelsmth@gmail.com>
   3 Date: Tue, 4 Feb 2020 20:56:48 +0100
   4 Subject: watchdog: qcom-wdt: disable pretimeout on timer platform
   5
   6 Some platform like ipq806x doesn't support pretimeout and define
   7 some interrupts used by qcom,msm-timer. Change the driver to check
   8 and use pretimeout only on qcom,kpss-wdt as it's the only platform
   9 that actually supports it.
  10
  11 Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
  12 Reviewed-by: Guenter Roeck <linux@roeck-us.net>
  13 Link: https://lore.kernel.org/r/20200204195648.23350-1-ansuelsmth@gmail.com
  14 [groeck: Conflict resolution]
  15 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
  16 Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
  17 ---
  18  drivers/watchdog/qcom-wdt.c | 31 +++++++++++++++++++++++--------
  19  1 file changed, 23 insertions(+), 8 deletions(-)
  20
  21 --- a/drivers/watchdog/qcom-wdt.c
  22 +++ b/drivers/watchdog/qcom-wdt.c
  23 @@ -39,6 +39,11 @@ static const u32 reg_offset_data_kpss[]
  24         [WDT_BITE_TIME] = 0x14,
  25  };
  26
  27 +struct qcom_wdt_match_data {
  28 +       const u32 *offset;
  29 +       bool pretimeout;
  30 +};
  31 +
  32  struct qcom_wdt {
  33         struct watchdog_device  wdd;
  34         unsigned long           rate;
  35 @@ -168,19 +173,29 @@ static void qcom_clk_disable_unprepare(v
  36         clk_disable_unprepare(data);
  37  }
  38
  39 +static const struct qcom_wdt_match_data match_data_apcs_tmr = {
  40 +       .offset = reg_offset_data_apcs_tmr,
  41 +       .pretimeout = false,
  42 +};
  43 +
  44 +static const struct qcom_wdt_match_data match_data_kpss = {
  45 +       .offset = reg_offset_data_kpss,
  46 +       .pretimeout = true,
  47 +};
  48 +
  49  static int qcom_wdt_probe(struct platform_device *pdev)
  50  {
  51         struct device *dev = &pdev->dev;
  52         struct qcom_wdt *wdt;
  53         struct resource *res;
  54         struct device_node *np = dev->of_node;
  55 -       const u32 *regs;
  56 +       const struct qcom_wdt_match_data *data;
  57         u32 percpu_offset;
  58         int irq, ret;
  59         struct clk *clk;
  60
  61 -       regs = of_device_get_match_data(dev);
  62 -       if (!regs) {
  63 +       data = of_device_get_match_data(dev);
  64 +       if (!data) {
  65                 dev_err(dev, "Unsupported QCOM WDT module\n");
  66                 return -ENODEV;
  67         }
  68 @@ -236,7 +251,7 @@ static int qcom_wdt_probe(struct platfor
  69
  70         /* check if there is pretimeout support */
  71         irq = platform_get_irq_optional(pdev, 0);
  72 -       if (irq > 0) {
  73 +       if (data->pretimeout && irq > 0) {
  74                 ret = devm_request_irq(dev, irq, qcom_wdt_isr,
  75                                        IRQF_TRIGGER_RISING,
  76                                        "wdt_bark", &wdt->wdd);
  77 @@ -256,7 +271,7 @@ static int qcom_wdt_probe(struct platfor
  78         wdt->wdd.min_timeout = 1;
  79         wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
  80         wdt->wdd.parent = dev;
  81 -       wdt->layout = regs;
  82 +       wdt->layout = data->offset;
  83
  84         if (readl(wdt_addr(wdt, WDT_STS)) & 1)
  85                 wdt->wdd.bootstatus = WDIOF_CARDRESET;
  86 @@ -300,9 +315,9 @@ static int __maybe_unused qcom_wdt_resum
  87  static SIMPLE_DEV_PM_OPS(qcom_wdt_pm_ops, qcom_wdt_suspend, qcom_wdt_resume);
  88
  89  static const struct of_device_id qcom_wdt_of_table[] = {
  90 -       { .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr },
  91 -       { .compatible = "qcom,scss-timer", .data = reg_offset_data_apcs_tmr },
  92 -       { .compatible = "qcom,kpss-wdt", .data = reg_offset_data_kpss },
  93 +       { .compatible = "qcom,kpss-timer", .data = &match_data_apcs_tmr },
  94 +       { .compatible = "qcom,scss-timer", .data = &match_data_apcs_tmr },
  95 +       { .compatible = "qcom,kpss-wdt", .data = &match_data_kpss },
  96         { },
  97  };
  98  MODULE_DEVICE_TABLE(of, qcom_wdt_of_table);