common:gn4124: Fix bug in wait interrupt. Was not re-enabling interrupt after handling it.

Add a function to read gn4124 interrupt configuration.

common/gn4124.py

@@ -42,9 +42,11 @@ class CGN4124:
     R_CLK_CSR = 0x808
     R_INT_CFG0 = 0x820
     R_GPIO_DIR_MODE = 0xA04
+    R_GPIO_INT_MASK = 0xA14
     R_GPIO_INT_MASK_CLR = 0xA18
     R_GPIO_INT_MASK_SET = 0xA1C
     R_GPIO_INT_STATUS = 0xA20
+    R_GPIO_INT_TYPE = 0xA24
     R_GPIO_INT_VALUE = 0xA28
 
     CLK_CSR_DIVOT_MASK = 0x3F0
@@ -121,8 +123,13 @@ class CGN4124:
         self.bus.irqena()
 
     # Wait for interrupt
-    def wait_irq(self):
-        return self.bus.irqwait()
+    def wait_irq(self, verbose=False):
+        if verbose:
+            print("[GN4124] Waiting IRQ...")
+        ret = self.bus.irqwait()
+        # re-enable the interrupt
+        self.bus.irqena()
+        return ret
 
     # GN4124 RSTOUT33 assert/de-assert cycle
     def rstout33_cycle(self):
@@ -139,11 +146,21 @@ class CGN4124:
         self.wr_reg(self.GN4124_BAR, self.R_GPIO_INT_MASK_SET, ~(1<<self.GPIO_INT_SRC))
         # Make sure the interrupt mask is cleared for GPIO8
         self.wr_reg(self.GN4124_BAR, self.R_GPIO_INT_MASK_CLR, (1<<self.GPIO_INT_SRC))
+        # Make sure the interrupt is edge sensitive for GPIO8
+        self.wr_reg(self.GN4124_BAR, self.R_GPIO_INT_TYPE, 0x0)
         # Interrupt on rising edge of GPIO8
         self.wr_reg(self.GN4124_BAR, self.R_GPIO_INT_VALUE, (1<<self.GPIO_INT_SRC))
         # GPIO as interrupt 0 source
         self.wr_reg(self.GN4124_BAR, self.R_INT_CFG0, (1<<self.INT_CFG0_GPIO))
 
+    def get_interrupt_config(self):
+        dir_mode = self.rd_reg(self.GN4124_BAR, self.R_GPIO_DIR_MODE)
+        int_mask = self.rd_reg(self.GN4124_BAR, self.R_GPIO_INT_MASK)
+        int_type = self.rd_reg(self.GN4124_BAR, self.R_GPIO_INT_TYPE)
+        int_value = self.rd_reg(self.GN4124_BAR, self.R_GPIO_INT_VALUE)
+        int_cfg = self.rd_reg(self.GN4124_BAR, self.R_INT_CFG0)
+        return dir_mode, int_mask, int_type, int_value, int_cfg
+
     # Get DMA controller status
     def get_dma_status(self):
         reg = self.dma_csr.rd_reg(self.R_DMA_STA)