The adaptor can be found on development boards for 78k, RL78 and V850 microcontrollers produced by Renesas Electronics Corporation. This is not a full-featured USB to serial converter, however it allows basic communication and simple control which is enough for programming of on-board flash and debugging through a debug monitor. uPD78F0730 is a USB-enabled microcontroller with USB-to-UART conversion implemented in firmware. This chip is also present in some debugging adaptors which use it for USB-to-SPI conversion as well. The present driver doesn't cover SPI, only USB-to-UART conversion is supported. Signed-off-by: Maksim Salau <maksim.salau@xxxxxxxxx> --- drivers/usb/serial/Kconfig | 9 + drivers/usb/serial/Makefile | 1 + drivers/usb/serial/upd78f0730.c | 537 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 547 insertions(+) create mode 100644 drivers/usb/serial/upd78f0730.c diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig index f612dda..f9c0950 100644 --- a/drivers/usb/serial/Kconfig +++ b/drivers/usb/serial/Kconfig @@ -719,6 +719,15 @@ config USB_SERIAL_QT2 To compile this driver as a module, choose M here: the module will be called quatech-serial. +config USB_SERIAL_UPD78F0730 + tristate "USB Renesas uPD78F0730 Single Port Serial Driver" + help + Say Y here if you want to use the Renesas uPD78F0730 + serial driver. + + To compile this driver as a module, choose M here: the + module will be called upd78f0730. + config USB_SERIAL_DEBUG tristate "USB Debugging Device" help diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile index f3fa5e5..7fcb758 100644 --- a/drivers/usb/serial/Makefile +++ b/drivers/usb/serial/Makefile @@ -61,3 +61,4 @@ 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_XSENS_MT) += xsens_mt.o +obj-$(CONFIG_USB_SERIAL_UPD78F0730) += upd78f0730.o diff --git a/drivers/usb/serial/upd78f0730.c b/drivers/usb/serial/upd78f0730.c new file mode 100644 index 0000000..6d90199 --- /dev/null +++ b/drivers/usb/serial/upd78f0730.c @@ -0,0 +1,537 @@ +/* + * Renesas Electronics uPD78F0730 USB to serial converter driver + * + * Copyright (C) 2014,2016 Maksim Salau <maksim.salau@xxxxxxxxx> + * + * 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. + * + * Protocol of the adaptor is described in the application note U19660EJ1V0AN00 + * μPD78F0730 8-bit Single-Chip Microcontroller + * USB-to-Serial Conversion Software + * <http://documentation.renesas.com/doc/DocumentServer/U19660EJ1V0AN00.pdf> + * + * The adaptor functionality is limited to the following: + * - data bits: 7 or 8 + * - stop bits: 1 or 2 + * - parity: even, odd or none + * - flow control: XON/XOFF or none + * - baudrates: 2400, 4800, 9600, 19200, 38400, 57600, 115200 + * - signals: DTS, RTS and BREAK + * - there is an option to enable parity error character substitution, + * but it is not supported by this driver + */ + +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/tty.h> +#include <linux/usb.h> +#include <linux/usb/serial.h> + +#define DRIVER_DESC "Renesas uPD78F0730 USB to serial converter driver" + +#define DRIVER_AUTHOR "Maksim Salau <maksim.salau@xxxxxxxxx>" + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(0x045B, 0x0212) }, /* YRPBRL78G13, YRPBRL78G14 */ + { USB_DEVICE(0x0409, 0x0063) }, /* V850ESJX3-STICK */ + {} +}; + +MODULE_DEVICE_TABLE(usb, id_table); + +/* + * Private data structure type declaration. + * Each adaptor is associated with a private structure, that holds the current + * state of control signals (DTR, RTS and BREAK). + */ +struct upd78f0730_serial_private { + spinlock_t lock; + __u8 line_signals; +}; + +/* Function prototypes */ +static int upd78f0730_send_ctl(struct usb_serial_port *port, + void *data, int size); +static int upd78f0730_attach(struct usb_serial *serial); +static void upd78f0730_release(struct usb_serial *serial); +static int upd78f0730_open(struct tty_struct *tty, + struct usb_serial_port *port); +static void upd78f0730_close(struct usb_serial_port *port); +static void upd78f0730_set_termios(struct tty_struct *tty, + struct usb_serial_port *port, + struct ktermios *old_termios); +static int upd78f0730_tiocmget(struct tty_struct *tty); +static int upd78f0730_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear); +static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on); +static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state); + +static struct usb_serial_driver upd78f0730_device = { + .driver = { + .owner = THIS_MODULE, + .name = "upd78f0730", + }, + .id_table = id_table, + .num_ports = 1, + .bulk_in_size = 64, + .bulk_out_size = 64, + .attach = upd78f0730_attach, + .release = upd78f0730_release, + .open = upd78f0730_open, + .close = upd78f0730_close, + .set_termios = upd78f0730_set_termios, + .tiocmget = upd78f0730_tiocmget, + .tiocmset = upd78f0730_tiocmset, + .dtr_rts = upd78f0730_dtr_rts, + .break_ctl = upd78f0730_break_ctl, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &upd78f0730_device, + NULL +}; + +/* Opcodes of control commands */ +#define LINE_CONTROL 0x00 +#define SET_DTR_RTS 0x01 +#define SET_XON_XOFF_CHR 0x02 +#define OPEN_CLOSE 0x03 +#define SET_ERR_CHR 0x04 + +/* Data sizes in LINE_CONTROL command */ +#define DATA_SIZE_7_BITS 0x00 +#define DATA_SIZE_8_BITS 0x01 +#define DATA_SIZE_MASK 0x01 + +/* Stop-bit modes in LINE_CONTROL command */ +#define STOP_BIT_1_BIT 0x00 +#define STOP_BIT_2_BIT 0x02 +#define STOP_BIT_MASK 0x02 + +/* Parity modes in LINE_CONTROL command */ +#define PARITY_NONE 0x00 +#define PARITY_EVEN 0x04 +#define PARITY_ODD 0x08 +#define PARITY_MASK 0x0C + +/* Flow control modes in LINE_CONTROL command */ +#define FLOW_CONTROL_NONE 0x00 +#define FLOW_CONTROL_HW 0x10 +#define FLOW_CONTROL_SW 0x20 +#define FLOW_CONTROL_MASK 0x30 + +/* Control signal bits in SET_DTR_RTS command */ +#define RESET_RTS 0x01 +#define RESET_DTR 0x02 +#define SET_BREAK 0x04 + +/* Port modes in OPEN_CLOSE command */ +#define PORT_CLOSE 0x00 +#define PORT_OPEN 0x01 + +/* Error character substitution modes in SET_ERR_CHR command */ +#define ERR_CHR_DISABLED 0x00 +#define ERR_CHR_ENABLED 0x01 + +/* + * Declaration of command structures + */ + +/* LINE_CONTROL command */ +struct line_control { + __u8 opcode; + __le32 baud_rate; + __u8 params; +} __packed; + +/* SET_DTR_RTS command */ +struct set_dtr_rts { + __u8 opcode; + __u8 params; +}; + +/* SET_XON_OFF_CHR command */ +struct set_xon_xoff_chr { + __u8 opcode; + __u8 xon; + __u8 xoff; +}; + +/* OPEN_CLOSE command */ +struct open_close { + __u8 opcode; + __u8 state; +}; + +/* SET_ERR_CHR command */ +struct set_err_chr { + __u8 opcode; + __u8 state; + __u8 err_char; +}; + +/* + * upd78f0730_send_ctl + * Send a control command to the adaptor. + * The data argument points to a command structure in memory, + * which is 'size' bytes long. + * On success 0 is returned, or negative value otherwise. + */ +static int upd78f0730_send_ctl(struct usb_serial_port *port, + void *data, int size) +{ + int res; + struct device *dev = &port->dev; + struct usb_device *usbdev = port->serial->dev; + + if (port == NULL || data == NULL || size == 0) { + dev_err(dev, "%s - invalid arguments\n", __func__); + return -EINVAL; + } + + res = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x00, + USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, + 0x0000, 0x0000, data, size, USB_CTRL_SET_TIMEOUT); + + if (res < 0 || res != size) { + dev_err(dev, "%s - failed to send request opcode=%02x, size=%d res=%d\n", + __func__, *(__u8 *)data, size, res); + return -EIO; + } + + return 0; +} + +/* + * upd78f0730_attach + * The function is called when a new adaptor is connected to the host. + * The function allocates the private structure for the adaptor. + */ +static int upd78f0730_attach(struct usb_serial *serial) +{ + struct upd78f0730_serial_private *private; + struct device *dev = &serial->dev->dev; + + dev_dbg(dev, "%s\n", __func__); + private = kzalloc(sizeof(*private), GFP_KERNEL); + if (private == NULL) { + dev_err(dev, "%s - unable to allocate memory for private data\n", + __func__); + return -ENOMEM; + } + spin_lock_init(&private->lock); + private->line_signals = RESET_DTR | RESET_RTS; + usb_set_serial_data(serial, private); + return 0; +} + +/* + * upd78f0730_release + * The function is called when the adaptor is detached from the host. + * The function de-allocates memory occupied by the private structure + * associated with the adaptor. + */ +static void upd78f0730_release(struct usb_serial *serial) +{ + struct upd78f0730_serial_private *private; + + dev_dbg(&serial->dev->dev, "%s\n", __func__); + private = usb_get_serial_data(serial); + kfree(private); +} + +/* + * upd78f0730_open + * The function is called when software opens the port + * that is associated with the adaptor. + * The function performs basic initialization of the adaptor: + * 1. opens port; + * 2. sets initial state for DTR and RTS; + * 3. disables error character substitution. + * The driver can control the state of the adaptor only if the port is opened. + */ +static int upd78f0730_open(struct tty_struct *tty, struct usb_serial_port *port) +{ + int res; + unsigned long flags; + struct upd78f0730_serial_private *private; + struct open_close request_open = { + .opcode = OPEN_CLOSE, + .state = PORT_OPEN + }; + struct set_dtr_rts request_set_dtr_rts = { + .opcode = SET_DTR_RTS, + .params = RESET_DTR | RESET_RTS + }; + struct set_err_chr request_set_err_chr = { + .opcode = SET_ERR_CHR, + .state = ERR_CHR_DISABLED, + .err_char = 0 + }; + + struct { + void *data; + int size; + } *request, requests[] = { + { &request_open, sizeof(request_open) }, + { &request_set_dtr_rts, sizeof(request_set_dtr_rts) }, + { &request_set_err_chr, sizeof(request_set_err_chr) }, + { } + }; + + dev_dbg(&port->dev, "%s\n", __func__); + private = usb_get_serial_data(port->serial); + spin_lock_irqsave(&private->lock, flags); + request_set_dtr_rts.params = private->line_signals; + spin_unlock_irqrestore(&private->lock, flags); + + request = requests; + do { + res = upd78f0730_send_ctl(port, request->data, request->size); + if (res) + return res; + ++request; + } while (request->data != NULL); + + upd78f0730_set_termios(tty, port, NULL); + + return usb_serial_generic_open(tty, port); +} + +/* + * upd78f0730_close + * The function is called when the port associated with the adaptor is closed + * by the host software. + * The function sends close command to the adaptor. From that moment, + * driver can't control state of the adaptor + * (e.g. state of the control signals). + */ +static void upd78f0730_close(struct usb_serial_port *port) +{ + struct open_close request_close = { + .opcode = OPEN_CLOSE, + .state = PORT_CLOSE + }; + + dev_dbg(&port->dev, "%s\n", __func__); + usb_serial_generic_close(port); + upd78f0730_send_ctl(port, &request_close, sizeof(request_close)); +} + +/* + * upd78f0730_set_termios + * Configure the adaptor according to software needs. + * The driver is not aware of the current configuration of the adaptor, + * and performs full reconfiguration every time. + * Note: Original devices support baudrates from 2400 up to 115200, + * but the driver doesn't limit the user in his desires. + */ +static void upd78f0730_set_termios(struct tty_struct *tty, + struct usb_serial_port *port, + struct ktermios *old_termios) +{ + struct device *dev = &port->dev; + struct line_control request = { .opcode = LINE_CONTROL }; + struct set_xon_xoff_chr request_xchr = { .opcode = SET_XON_XOFF_CHR }; + tcflag_t cflag = tty->termios.c_cflag; + speed_t baud_rate = tty_get_baud_rate(tty); + + request.baud_rate = cpu_to_le32(baud_rate); + dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud_rate); + + request_xchr.xon = START_CHAR(tty); + request_xchr.xoff = STOP_CHAR(tty); + dev_dbg(dev, "%s - XON = %02X, XOFF = %02X\n", __func__, + request_xchr.xon, request_xchr.xoff); + + request.params = 0; + switch (cflag & CSIZE) { + case CS7: + request.params |= DATA_SIZE_7_BITS; + dev_dbg(dev, "%s - 7 data bits\n", __func__); + break; + case CS8: + request.params |= DATA_SIZE_8_BITS; + dev_dbg(dev, "%s - 8 data bits\n", __func__); + break; + default: + request.params |= DATA_SIZE_8_BITS; + dev_err(dev, "%s - data size is not supported, falling back to 8 bits\n", + __func__); + break; + } + if (cflag & PARENB) { + if (cflag & PARODD) { + request.params |= PARITY_ODD; + dev_dbg(dev, "%s - odd parity\n", __func__); + } else { + request.params |= PARITY_EVEN; + dev_dbg(dev, "%s - even parity\n", __func__); + } + } else { + request.params |= PARITY_NONE; + dev_dbg(dev, "%s - no parity\n", __func__); + } + if (cflag & CSTOPB) { + request.params |= STOP_BIT_2_BIT; + dev_dbg(dev, "%s - 2 stop bits\n", __func__); + } else { + request.params |= STOP_BIT_1_BIT; + dev_dbg(dev, "%s - 1 stop bit\n", __func__); + } + if (cflag & CRTSCTS) { + dev_err(dev, "%s - hardware flow control is not supported\n", + __func__); + } + if (I_IXOFF(tty) || I_IXON(tty)) { + request.params |= FLOW_CONTROL_SW; + dev_dbg(dev, "%s - software flow control\n", __func__); + } else { + request.params |= FLOW_CONTROL_NONE; + dev_dbg(dev, "%s - no flow control\n", __func__); + } + + upd78f0730_send_ctl(port, &request, sizeof(request)); + upd78f0730_send_ctl(port, &request_xchr, sizeof(request_xchr)); +} + +/* + * upd78f0730_tiocmget + * Read current state of DTR and RTS. + * Other signals are not present and the values associated with them + * shall be ignored. + */ +static int upd78f0730_tiocmget(struct tty_struct *tty) +{ + int res = 0; + int signals; + unsigned long flags; + struct device *dev = tty->dev; + struct upd78f0730_serial_private *private; + struct usb_serial_port *port = tty->driver_data; + + private = usb_get_serial_data(port->serial); + + spin_lock_irqsave(&private->lock, flags); + signals = private->line_signals; + spin_unlock_irqrestore(&private->lock, flags); + + res = ((signals & RESET_DTR) ? 0 : TIOCM_DTR) + | ((signals & RESET_RTS) ? 0 : TIOCM_RTS); + + dev_dbg(dev, "%s - res = %x\n", __func__, res); + + return res; +} + +/* + * upd78f0730_tiocmset + * Set state of DTR and RTS. + * Requests for other signals are ignored without reporting a failure. + */ +static int upd78f0730_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear) +{ + int res; + unsigned long flags; + struct device *dev = tty->dev; + struct upd78f0730_serial_private *private; + struct usb_serial_port *port = tty->driver_data; + struct set_dtr_rts request = { .opcode = SET_DTR_RTS }; + + private = usb_get_serial_data(port->serial); + + dev_dbg(dev, "%s\n", __func__); + spin_lock_irqsave(&private->lock, flags); + if (set & TIOCM_DTR) { + private->line_signals &= ~RESET_DTR; + dev_dbg(dev, "%s - set DTR\n", __func__); + } + if (set & TIOCM_RTS) { + private->line_signals &= ~RESET_RTS; + dev_dbg(dev, "%s - set RTS\n", __func__); + } + if (clear & TIOCM_DTR) { + private->line_signals |= RESET_DTR; + dev_dbg(dev, "%s - reset DTR\n", __func__); + } + if (clear & TIOCM_RTS) { + private->line_signals |= RESET_RTS; + dev_dbg(dev, "%s - reset RTS\n", __func__); + } + request.params = private->line_signals; + spin_unlock_irqrestore(&private->lock, flags); + + res = upd78f0730_send_ctl(port, &request, sizeof(request)); + + return res; +} + +/* + * upd78f0730_dtr_rts + * Initialize both DTR and RTS to a value passed as argument. + */ +static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on) +{ + unsigned long flags; + struct device *dev = &port->dev; + struct upd78f0730_serial_private *private; + struct set_dtr_rts request = { .opcode = SET_DTR_RTS }; + + private = usb_get_serial_data(port->serial); + + spin_lock_irqsave(&private->lock, flags); + if (on) { + private->line_signals &= ~(RESET_DTR | RESET_RTS); + dev_dbg(dev, "%s - set DTR and RTS\n", __func__); + } else { + private->line_signals |= RESET_DTR | RESET_RTS; + dev_dbg(dev, "%s - reset DTR and RTS\n", __func__); + } + request.params = private->line_signals; + spin_unlock_irqrestore(&private->lock, flags); + + upd78f0730_send_ctl(port, &request, sizeof(request)); +} + +/* + * upd78f0730_break_ctl + * Control BREAK signal. + * The BREAK signal is not covered in the specification of the adaptor. + * It's behavior was sniffed from the original driver for Windows. + * BREAK is controlled by a bit in the 'params' field of SET_DTR_RTS command. + */ +static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state) +{ + unsigned long flags; + struct device *dev = tty->dev; + struct upd78f0730_serial_private *private; + struct usb_serial_port *port = tty->driver_data; + struct set_dtr_rts request = { .opcode = SET_DTR_RTS }; + + private = usb_get_serial_data(port->serial); + + spin_lock_irqsave(&private->lock, flags); + if (break_state) { + private->line_signals |= SET_BREAK; + dev_dbg(dev, "%s - set BREAK\n", __func__); + } else { + private->line_signals &= ~SET_BREAK; + dev_dbg(dev, "%s - reset BREAK\n", __func__); + } + request.params = private->line_signals; + spin_unlock_irqrestore(&private->lock, flags); + + upd78f0730_send_ctl(port, &request, sizeof(request)); +} + +module_usb_serial_driver(serial_drivers, id_table); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_LICENSE("GPL"); -- 2.5.0 -- 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
