Add support for controlling PERST of WWAN modems (on qmod)

firmware/src_simtrace/wwan_perst.c

@@ -0,0 +1,57 @@
+/* Code to control the PERST lines of attached modems
+ *
+ * Depending on the board this is running on,  it might be possible
+ * for the controller to set the status of the PERST input line of
+ * the cellular modem.  If the board supports this, it sets the
+ * PIN_PERST1 and/or PIN_PERST2 defines in its board.h file.
+ */
+
+#include "board.h"
+#include "wwan_perst.h"
+
+#ifdef PIN_PERST1
+static const Pin pin_perst1 = PIN_PERST1;
+#endif
+
+#ifdef PIN_PERST2
+static const Pin pin_perst2 = PIN_PERST2;
+#endif
+
+int wwan_perst_do_reset(int modem_nr)
+{
+	static const Pin *pin;
+
+	switch (modem_nr) {
+#ifdef PIN_PERST1
+	case 1:
+		pin = &pin_perst1;
+		break;
+#endif
+#ifdef PIN_PERST2
+	case 2:
+		pin = &pin_perst2;
+		break;
+#endif
+	default:
+		return -1;
+	}
+	PIO_Clear(pin);
+	mdelay(1);
+	PIO_Set(pin);
+	return 0;
+}
+
+int wwan_perst_init(void)
+{
+	int num_perst = 0;
+#ifdef PIN_PERST1
+	PIO_Configure(&pin_perst1, 1);
+	num_perst++;
+#endif
+
+#ifdef PIN_PERST2
+	PIO_Configure(&pin_perst2, 1);
+	num_perst++;
+#endif
+	return num_perst;
+}

firmware/src_simtrace/wwan_perst.h

@@ -0,0 +1,4 @@
+#pragma once
+
+int wwan_perst_do_reset(int modem_nr);
+int wwan_perst_init(void);