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

firmware/Makefile

@@ -147,7 +147,7 @@ C_CMSIS    = core_cm3.o
 C_LOWLEVEL = board_cstartup_gnu.o board_lowlevel.o syscalls.o exceptions.o
 C_LIBLEVEL = spi.o pio.o pmc.o usart.o pio_it.o pio_capture.o uart_console.o iso7816_4.o wdt.o led.o tc.o unique_id.o
 C_CCID = cciddriver.o USBD.o USBDDriver.o USBD_HAL.o USBRequests.o USBDCallbacks.o USBDescriptors.o USBDDriverCallbacks.o
-C_SIMTRACE = simtrace_iso7816.o usb.o ccid.o sniffer.o mitm.o ringbuffer.o host_communication.o iso7816_fidi.o tc_etu.o req_ctx.o card_emu.o mode_cardemu.o i2c.o wwan_led.o
+C_SIMTRACE = simtrace_iso7816.o usb.o ccid.o sniffer.o mitm.o ringbuffer.o host_communication.o iso7816_fidi.o tc_etu.o req_ctx.o card_emu.o mode_cardemu.o i2c.o wwan_led.o wwan_perst.o
 C_APPLEVEL = main.o
 C_OBJECTS  = $(C_CMSIS) $(C_LOWLEVEL) $(C_LIBLEVEL) $(C_APPLEVEL) $(C_CCID) $(C_SIMTRACE)
 

firmware/include_board/qmod/board.h

@@ -48,6 +48,11 @@
 #define PIN_WWAN2		{PIO_PA16, PIOA, ID_PIOA, PIO_INPUT, PIO_PULLUP | PIO_DEGLITCH | PIO_IT_EDGE}
 #define PINS_WWAN_IN		{ PIN_WWAN1, PIN_WWAN2 }
 
+/* outputs controlling RESET input of modems */
+#define PIN_PERST1		{PIO_PA25, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_PULLUP}
+#define PIN_PERST2		{PIO_PA26, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_PULLUP}
+#define PINS_PERST		{ PIN_PERST1, PIN_PERST2 }
+
 #define SIMTRACE_VENDOR_ID          0x1d50
 #define SIMTRACE_PRODUCT_ID         0x60e3	/* FIXME */
 #define USB_VENDOR_ID               SIMTRACE_VENDOR_ID

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);