ASoC: wm_adsp: Add WDT expiry IRQ handling support for Halo core

Signed-off-by: Stuart Henderson <stuarth@opensource.cirrus.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm_adsp.c

@@ -242,6 +242,7 @@
 #define HALO_SCRATCH4                        0x005d8
 #define HALO_CCM_CORE_CONTROL                0x41000
 #define HALO_CORE_SOFT_RESET                 0x00010
+#define HALO_WDT_CONTROL                     0x47000
 
 /*
  * HALO MPU banks
@@ -291,6 +292,11 @@
  */
 #define HALO_CORE_SOFT_RESET_MASK           0x00000001
 
+/*
+ * HALO_WDT_CONTROL
+ */
+#define HALO_WDT_EN_MASK                    0x00000001
+
 /*
  * HALO_MPU_?M_VIO_STATUS
  */
@@ -3083,6 +3089,12 @@ static void wm_adsp_stop_watchdog(struct wm_adsp *dsp)
 			   ADSP2_WDT_ENA_MASK, 0);
 }
 
+static void wm_halo_stop_watchdog(struct wm_adsp *dsp)
+{
+	regmap_update_bits(dsp->regmap, dsp->base + HALO_WDT_CONTROL,
+			   HALO_WDT_EN_MASK, 0);
+}
+
 int wm_adsp_early_event(struct snd_soc_dapm_widget *w,
 			struct snd_kcontrol *kcontrol, int event)
 {
@@ -4379,6 +4391,22 @@ exit_unlock:
 }
 EXPORT_SYMBOL_GPL(wm_halo_bus_error);
 
+irqreturn_t wm_halo_wdt_expire(int irq, void *data)
+{
+	struct wm_adsp *dsp = data;
+
+	mutex_lock(&dsp->pwr_lock);
+
+	adsp_warn(dsp, "WDT Expiry Fault\n");
+	wm_halo_stop_watchdog(dsp);
+	wm_adsp_fatal_error(dsp);
+
+	mutex_unlock(&dsp->pwr_lock);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL_GPL(wm_halo_wdt_expire);
+
 struct wm_adsp_ops wm_adsp1_ops = {
 	.validate_version = wm_adsp_validate_version,
 	.parse_sizes = wm_adsp1_parse_sizes,
@@ -4454,6 +4482,7 @@ struct wm_adsp_ops wm_halo_ops = {
 	.region_to_reg = wm_halo_region_to_reg,
 
 	.show_fw_status = wm_halo_show_fw_status,
+	.stop_watchdog = wm_halo_stop_watchdog,
 
 	.lock_memory = wm_halo_configure_mpu,
 

sound/soc/codecs/wm_adsp.h

@@ -176,6 +176,7 @@ int wm_adsp_early_event(struct snd_soc_dapm_widget *w,
 
 irqreturn_t wm_adsp2_bus_error(struct wm_adsp *adsp);
 irqreturn_t wm_halo_bus_error(struct wm_adsp *dsp);
+irqreturn_t wm_halo_wdt_expire(int irq, void *data);
 
 int wm_adsp_event(struct snd_soc_dapm_widget *w,
 		  struct snd_kcontrol *kcontrol, int event);