[nrf noup] nrf_cleanup: temporary GRTC cleanup with no counter reset

nrf-squash! [nrf noup] nrf_cleanup: nRF54h: fix missing peripheral cleanup

The GRTC should not reset its value and stop running when switching for
MCUBoot to application. Also in general, this should not be done in case
of reset - so the nrfx_grtc_unit function should not reset the counter
value. This will be fixed in nrfx (NRFX-8487), but the solution
is needed quicker. Hence, a temporary uninit function for GRTC was
added in nrf_cleanup, fixing this issue for MCUBoot.

Signed-off-by: Artur Hadasz <[email protected]>

Author: ahasztag

boot/zephyr/nrf_cleanup.c

@@ -52,9 +52,35 @@ static inline void nrf_cleanup_rtc(NRF_RTC_Type * rtc_reg)
 #endif
 
 #if defined(CONFIG_NRF_GRTC_TIMER)
+
+/**
+ * This function is temporary and should be removed once nrfx_grtc_uninit
+ * no longer resets the counter - see NRFX-8487.
+ */
+static inline void nrfx_grtc_uninit_no_counter_reset(void)
+{
+    uint32_t ch_mask = NRFX_GRTC_CONFIG_ALLOWED_CC_CHANNELS_MASK;
+
+#if NRF_GRTC_HAS_RTCOUNTER
+    uint32_t grtc_all_int_mask = (NRFX_GRTC_CONFIG_ALLOWED_CC_CHANNELS_MASK |
+                                  GRTC_NON_SYSCOMPARE_INT_MASK);
+#else
+    uint32_t grtc_all_int_mask = NRFX_GRTC_CONFIG_ALLOWED_CC_CHANNELS_MASK;
+#endif
+
+    nrfy_grtc_int_disable(NRF_GRTC, grtc_all_int_mask);
+
+    for (uint8_t chan = 0; ch_mask; chan++, ch_mask >>= 1)
+    {
+        nrfx_grtc_syscounter_cc_disable(chan);
+        nrfx_grtc_channel_free(chan);
+    }
+    nrfy_grtc_int_uninit(NRF_GRTC);
+}
+
 static inline void nrf_cleanup_grtc(void)
 {
-    nrfx_grtc_uninit();
+    nrfx_grtc_uninit_no_counter_reset();
 }
 #endif