262 lines
6.4 KiB
C
262 lines
6.4 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/serial.h>
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#include <grub/types.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/usb.h>
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enum
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{
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GRUB_USBSERIAL_MODEM_CTRL = 0x01,
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GRUB_USBSERIAL_FLOW_CTRL = 0x02,
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GRUB_USBSERIAL_SPEED_CTRL = 0x03,
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GRUB_USBSERIAL_DATA_CTRL = 0x04
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};
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#define GRUB_USBSERIAL_MODEM_CTRL_DTRRTS 3
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#define GRUB_USBSERIAL_FLOW_CTRL_DTRRTS 3
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/* Convert speed to divisor. */
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static grub_uint32_t
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get_divisor (unsigned int speed)
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{
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unsigned int i;
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/* The structure for speed vs. divisor. */
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struct divisor
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{
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unsigned int speed;
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grub_uint32_t div;
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};
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/* The table which lists common configurations. */
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/* Computed with a division formula with 3MHz as base frequency. */
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static struct divisor divisor_tab[] =
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{
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{ 2400, 0x04e2 },
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{ 4800, 0x0271 },
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{ 9600, 0x4138 },
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{ 19200, 0x809c },
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{ 38400, 0xc04e },
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{ 57600, 0xc034 },
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{ 115200, 0x001a }
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};
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/* Set the baud rate. */
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for (i = 0; i < ARRAY_SIZE (divisor_tab); i++)
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if (divisor_tab[i].speed == speed)
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return divisor_tab[i].div;
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return 0;
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}
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static void
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real_config (struct grub_serial_port *port)
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{
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grub_uint32_t divisor;
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const grub_uint16_t parities[] = {
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[GRUB_SERIAL_PARITY_NONE] = 0x0000,
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[GRUB_SERIAL_PARITY_ODD] = 0x0100,
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[GRUB_SERIAL_PARITY_EVEN] = 0x0200
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};
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const grub_uint16_t stop_bits[] = {
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[GRUB_SERIAL_STOP_BITS_1] = 0x0000,
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[GRUB_SERIAL_STOP_BITS_2] = 0x1000,
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};
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if (port->configured)
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return;
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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GRUB_USBSERIAL_MODEM_CTRL,
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GRUB_USBSERIAL_MODEM_CTRL_DTRRTS, 0, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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GRUB_USBSERIAL_FLOW_CTRL,
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GRUB_USBSERIAL_FLOW_CTRL_DTRRTS, 0, 0, 0);
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divisor = get_divisor (port->config.speed);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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GRUB_USBSERIAL_SPEED_CTRL,
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divisor & 0xffff, divisor >> 16, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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GRUB_USBSERIAL_DATA_CTRL,
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parities[port->config.parity]
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| stop_bits[port->config.stop_bits]
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| port->config.word_len, 0, 0, 0);
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port->configured = 1;
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}
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/* Fetch a key. */
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static int
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usbserial_hw_fetch (struct grub_serial_port *port)
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{
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char cc[3];
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grub_usb_err_t err;
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real_config (port);
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err = grub_usb_bulk_read (port->usbdev, port->in_endp->endp_addr, 2, cc);
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if (err != GRUB_USB_ERR_NAK)
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return -1;
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err = grub_usb_bulk_read (port->usbdev, port->in_endp->endp_addr, 3, cc);
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if (err != GRUB_USB_ERR_NONE)
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return -1;
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return cc[2];
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}
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/* Put a character. */
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static void
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usbserial_hw_put (struct grub_serial_port *port, const int c)
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{
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char cc = c;
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real_config (port);
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grub_usb_bulk_write (port->usbdev, port->out_endp->endp_addr, 1, &cc);
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}
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static grub_err_t
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usbserial_hw_configure (struct grub_serial_port *port,
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struct grub_serial_config *config)
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{
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grub_uint16_t divisor;
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divisor = get_divisor (config->speed);
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if (divisor == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad speed");
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if (config->parity != GRUB_SERIAL_PARITY_NONE
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&& config->parity != GRUB_SERIAL_PARITY_ODD
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&& config->parity != GRUB_SERIAL_PARITY_EVEN)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "unsupported parity");
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if (config->stop_bits != GRUB_SERIAL_STOP_BITS_1
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&& config->stop_bits != GRUB_SERIAL_STOP_BITS_2)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "unsupported stop bits");
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if (config->word_len < 5 || config->word_len > 8)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "unsupported word length");
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port->config = *config;
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port->configured = 0;
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return GRUB_ERR_NONE;
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}
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static struct grub_serial_driver grub_usbserial_driver =
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{
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.configure = usbserial_hw_configure,
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.fetch = usbserial_hw_fetch,
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.put = usbserial_hw_put
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};
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static const struct
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{
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grub_uint16_t vendor, product;
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} products[] =
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{
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{0x0403, 0x6001} /* QEMU virtual USBserial. */
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};
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static int
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grub_ftdi_attach (grub_usb_device_t usbdev, int configno, int interfno)
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{
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static struct grub_serial_port *port;
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int j;
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struct grub_usb_desc_if *interf;
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interf = usbdev->config[configno].interf[interfno].descif;
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port = grub_malloc (sizeof (*port));
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if (!port)
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{
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grub_print_error ();
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return 0;
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}
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port->name = grub_xasprintf ("usb%d", usbdev->addr);
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if (!port->name)
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{
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grub_free (port);
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grub_print_error ();
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return 0;
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}
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port->usbdev = usbdev;
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port->driver = &grub_usbserial_driver;
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for (j = 0; j < interf->endpointcnt; j++)
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{
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struct grub_usb_desc_endp *endp;
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endp = &usbdev->config[0].interf[interfno].descendp[j];
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if ((endp->endp_addr & 128) && (endp->attrib & 3) == 2)
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{
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/* Bulk IN endpoint. */
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port->in_endp = endp;
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}
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else if (!(endp->endp_addr & 128) && (endp->attrib & 3) == 2)
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{
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/* Bulk OUT endpoint. */
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port->out_endp = endp;
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}
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}
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if (!port->out_endp || !port->in_endp)
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{
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grub_free (port->name);
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grub_free (port);
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return 0;
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}
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grub_serial_config_defaults (port);
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grub_serial_register (port);
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return 1;
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}
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static int
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grub_usbserial_attach (grub_usb_device_t usbdev, int configno, int interfno)
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{
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unsigned j;
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for (j = 0; j < ARRAY_SIZE (products); j++)
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if (usbdev->descdev.vendorid == products[j].vendor
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&& usbdev->descdev.prodid == products[j].product)
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break;
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if (j == ARRAY_SIZE (products))
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return 0;
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return grub_ftdi_attach (usbdev, configno, interfno);
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}
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struct grub_usb_attach_desc attach_hook =
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{
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.class = 0xff,
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.hook = grub_usbserial_attach
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};
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GRUB_MOD_INIT(usbserial_ftdi)
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{
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grub_usb_register_attach_hook_class (&attach_hook);
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}
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