Wishbone is an open hardware SoC bus commonly used in FPGA designs. Bus access can be serialized using the Etherbone protocol <http://www.ohwr.org/projects/etherbone-core>. This driver is intended to be used with devices which attach their internal Wishbone bus to a USB serial interface using the Etherbone protocol. A userspace library is required to speak the protocol made available by this driver as ttyUSBx. Signed-off-by: Wesley W. Terpstra <w.terpstra@xxxxxx> --- drivers/usb/serial/Kconfig | 17 ++++++ drivers/usb/serial/Makefile | 1 + drivers/usb/serial/wishbone-serial.c | 95 ++++++++++++++++++++++++++++++++++ 3 files changed, 113 insertions(+) create mode 100644 drivers/usb/serial/wishbone-serial.c diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig index 17b7f9a..504f26e 100644 --- a/drivers/usb/serial/Kconfig +++ b/drivers/usb/serial/Kconfig @@ -667,6 +667,23 @@ config USB_SERIAL_ZIO To compile this driver as a module, choose M here: the module will be called zio. +config USB_SERIAL_WISHBONE + tristate "USB-Wishbone adapter interface driver" + help + Say Y here if you want to use a USB attached Wishbone bus. + + Wishbone is an open hardware SoC bus commonly used in FPGA + designs. Bus access can be serialized using the Etherbone + protocol <http://www.ohwr.org/projects/etherbone-core>. + + This driver is intended to be used with devices which attach + their internal Wishbone bus to a USB serial interface using + the Etherbone protocol. A userspace library is required to + speak the protocol made available by this driver as ttyUSBx. + + To compile this driver as a module, choose M here: the + module will be called wishbone-serial. + config USB_SERIAL_ZTE tristate "ZTE USB serial driver" help diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile index eaf5ca1..cec63fa 100644 --- a/drivers/usb/serial/Makefile +++ b/drivers/usb/serial/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_USB_SERIAL_SYMBOL) += symbolserial.o obj-$(CONFIG_USB_SERIAL_WWAN) += usb_wwan.o obj-$(CONFIG_USB_SERIAL_TI) += ti_usb_3410_5052.o obj-$(CONFIG_USB_SERIAL_VISOR) += visor.o +obj-$(CONFIG_USB_SERIAL_WISHBONE) += wishbone-serial.o obj-$(CONFIG_USB_SERIAL_WHITEHEAT) += whiteheat.o obj-$(CONFIG_USB_SERIAL_XIRCOM) += keyspan_pda.o obj-$(CONFIG_USB_SERIAL_VIVOPAY_SERIAL) += vivopay-serial.o diff --git a/drivers/usb/serial/wishbone-serial.c b/drivers/usb/serial/wishbone-serial.c new file mode 100644 index 0000000..481ec66 --- /dev/null +++ b/drivers/usb/serial/wishbone-serial.c @@ -0,0 +1,95 @@ +/* + * USB Wishbone-Serial adapter driver + * + * Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@xxxxxx> + * Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/tty.h> +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/usb/serial.h> +#include <linux/uaccess.h> + +#define GSI_VENDOR_OPENCLOSE 0xB0 + +static const struct usb_device_id id_table[] = { + { USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) }, + { }, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +/* + * Etherbone must be told that a new stream has begun before data arrives. + * This is necessary to restart the negotiation of Wishbone bus parameters. + * Similarly, when the stream ends, Etherbone must be told so that the cycle + * line can be driven low in the case that userspace failed to do so. + */ +static int usb_gsi_openclose(struct usb_serial_port *port, int value) +{ + struct usb_device *dev = port->serial->dev; + + return usb_control_msg( + dev, + usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */ + GSI_VENDOR_OPENCLOSE, + USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, + value, /* wValue = device is open(1) or closed(0) */ + port->serial->interface->cur_altsetting->desc.bInterfaceNumber, + 0, 0, /* There is no data stage */ + 5000); /* Timeout till operation fails */ +} + +static int wishbone_serial_open(struct tty_struct *tty, + struct usb_serial_port *port) +{ + int retval; + + retval = usb_gsi_openclose(port, 1); + if (retval) { + dev_err(&port->serial->dev->dev, + "Could not mark device as open (%d)\n", + retval); + return retval; + } + + retval = usb_serial_generic_open(tty, port); + if (retval) + usb_gsi_openclose(port, 0); + + return retval; +} + +static void wishbone_serial_close(struct usb_serial_port *port) +{ + usb_serial_generic_close(port); + usb_gsi_openclose(port, 0); +} + +static struct usb_serial_driver wishbone_serial_device = { + .driver = { + .owner = THIS_MODULE, + .name = "wishbone_serial", + }, + .id_table = id_table, + .num_ports = 1, + .open = &wishbone_serial_open, + .close = &wishbone_serial_close, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &wishbone_serial_device, NULL +}; + +module_usb_serial_driver(serial_drivers, id_table); + +MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@xxxxxx>"); +MODULE_DESCRIPTION("USB Wishbone-Serial adapter"); +MODULE_LICENSE("GPL"); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
