Add Osmocom icE1usb driver

The Osmocom icE1usb is a modern, software-defined open hardware and
open source firmware design for a USB E1 interface.  You can find more
information at https://osmocom.org/projects/e1-t1-adapter/wiki/IcE1usb

The hardware design can be found at https://git.osmocom.org/osmo-e1-hardware

The FPGA gateware and associated embedded firmware is hosted in the same
git repository. Some parts are in submodules (be sure to use recursive
clone)

This DAHDI driver allows t lothe use of the icE1usb just like any other
E1/PRI interface device supported by DAHDI.  When using this DAHDI
driver, osmo-e1d most not be used.  The DAHDI driver is a replacement /
alternative for osmo-e1d.

drivers/dahdi/Kbuild

@@ -6,6 +6,10 @@ obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_DYNAMIC_ETH)	+= dahdi_dynamic_eth.o
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_DYNAMIC_ETHMF)	+= dahdi_dynamic_ethmf.o
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_TRANSCODE)		+= dahdi_transcode.o
 
+ifdef CONFIG_USB
+obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_ICE1USB)		+= icE1usb/
+endif
+
 ifdef CONFIG_PCI
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_OCT612X)		+= oct612x/
 obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_WCT4XXP)		+= wct4xxp/

drivers/dahdi/Kconfig

@@ -250,4 +250,17 @@ config DAHDI_WCTE11XP
 
 	  If unsure, say Y.
 
+config DAHDI_ICE1USB
+	tristate "Osmocom iceE1usb dual-E1 Support"
+	depends on DAHDI && USB
+	default DAHDI
+	---help---
+	  This driver provides support for the Osmocom icE1usb product.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called icE1usb.
+
+	  If unsure, say Y.
+
+
 source "drivers/dahdi/xpp/Kconfig"

drivers/dahdi/icE1usb/Kbuild

+obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_ICE1USB) += icE1usb.o

drivers/dahdi/icE1usb/ice1usb_proto.h

+#pragma once
+
+/* Header file describing the USB protocol between the icE1usb firmware and the host
+ * software (currently really only osmo-e1d) */
+
+/***********************************************************************
+ * Control Endpoint / Device Requests
+ ***********************************************************************/
+
+/*! returns a bit-mask of optional device capabilities (see enum e1usb_dev_capability) */
+#define ICE1USB_DEV_GET_CAPABILITIES	0x01
+#define ICE1USB_DEV_GET_FW_BUILD	0x02
+
+enum e1usb_dev_capability {
+	/*! Does this board have a GPS-DO */
+	ICE1USB_DEV_CAP_GPSDO,
+};
+
+
+/* Interface Requests */
+
+/*! returns a bit-mask of optional device capabilities (see enum e1usb_intf_capability) */
+#define ICE1USB_INTF_GET_CAPABILITIES	0x01
+#define ICE1USB_INTF_SET_TX_CFG		0x02	/*!< struct ice1usb_tx_config */
+#define ICE1USB_INTF_GET_TX_CFG		0x03	/*!< struct ice1usb_tx_config */
+#define ICE1USB_INTF_SET_RX_CFG		0x04	/*!< struct ice1usb_rx_config */
+#define ICE1USB_INTF_GET_RX_CFG		0x05	/*!< struct ice1usb_rx_config */
+
+//enum e1usb_intf_capability { };
+
+enum ice1usb_tx_mode {
+	ICE1USB_TX_MODE_TRANSP		= 0,
+	ICE1USB_TX_MODE_TS0		= 1,
+	ICE1USB_TX_MODE_TS0_CRC4	= 2,
+	ICE1USB_TX_MODE_TS0_CRC4_E	= 3,
+};
+
+enum ice1usb_tx_timing {
+	ICE1USB_TX_TIME_SRC_LOCAL	= 0,
+	ICE1USB_TX_TIME_SRC_REMOTE	= 1,
+};
+
+enum ice1usb_tx_ext_loopback {
+	ICE1USB_TX_EXT_LOOPBACK_OFF	= 0,
+	ICE1USB_TX_EXT_LOOPBACK_SAME	= 1,
+	ICE1USB_TX_EXT_LOOPBACK_CROSS	= 2,
+};
+
+/* ICE1USB_INTF_{GET,SET}_TX_CFG */
+struct ice1usb_tx_config {
+	uint8_t mode;		/*!< enum ice1usb_tx_mode */
+	uint8_t timing;		/*!< enum ice1usb_tx_timing */
+	uint8_t ext_loopback;	/*!< enum ice1usb_tx_ext_loopback */
+	uint8_t alarm;		/*!< 1 = transmit alarm; 0 = don't */
+} __attribute__((packed));
+
+
+enum ice1usb_rx_mode {
+	/*! transparent, unaligned bitstream */
+	ICE1USB_RX_MODE_TRANSP		= 0,
+	/*! alignment to E1 frame */
+	ICE1USB_RX_MODE_FRAME		= 2,
+	/*! alignment to E1 multiframe */
+	ICE1USB_RX_MODE_MULTIFRAME	= 3,
+};
+
+/* ICE1USB_INTF_{GET,SET}_RX_CFG */
+struct ice1usb_rx_config {
+	uint8_t mode;		/*!< enum ice1usb_rx_mode */
+} __attribute__((packed));
+
+
+/***********************************************************************
+ * Interrupt Endpoint
+ ***********************************************************************/
+
+enum ice1usb_irq_type {
+	ICE1USB_IRQQ_T_ERRCNT		= 1,
+};
+
+/* Ensue ro keep those in sync with e1.h */
+#define ICE1USB_ERR_F_ALIGN_ERR	0x01
+#define ICE1USB_ERR_F_TICK_ERR	0x02
+
+struct ice1usb_irq_err {
+	/* 16-bit little-endian counters */
+	uint16_t crc;
+	uint16_t align;
+	uint16_t ovfl;
+	uint16_t unfl;
+	uint8_t flags;
+} __attribute__((packed));
+
+struct ice1usb_irq {
+	uint8_t type; 		/*!< enum ice1usb_irq_type */
+	union {
+		struct ice1usb_irq_err errors;
+	} u;
+} __attribute__((packed));