--- /dev/null
- int i;
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/machine/memory.h>
+#include <grub/serial.h>
+#include <grub/ns8250.h>
+#include <grub/types.h>
+#include <grub/dl.h>
+#include <grub/misc.h>
+#include <grub/cpu/io.h>
+#include <grub/mm.h>
+
+#ifdef GRUB_MACHINE_PCBIOS
+static const unsigned short *serial_hw_io_addr = (const unsigned short *) GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR;
+#define GRUB_SERIAL_PORT_NUM 4
+#else
+#include <grub/machine/serial.h>
+static const grub_port_t serial_hw_io_addr[] = GRUB_MACHINE_SERIAL_PORTS;
+#define GRUB_SERIAL_PORT_NUM (ARRAY_SIZE(serial_hw_io_addr))
+#endif
+
+/* Convert speed to divisor. */
+static unsigned short
+serial_get_divisor (unsigned int speed)
+{
+ unsigned int i;
+
+ /* The structure for speed vs. divisor. */
+ struct divisor
+ {
+ unsigned int speed;
+ unsigned short div;
+ };
+
+ /* The table which lists common configurations. */
+ /* 1843200 / (speed * 16) */
+ static struct divisor divisor_tab[] =
+ {
+ { 2400, 0x0030 },
+ { 4800, 0x0018 },
+ { 9600, 0x000C },
+ { 19200, 0x0006 },
+ { 38400, 0x0003 },
+ { 57600, 0x0002 },
+ { 115200, 0x0001 }
+ };
+
+ /* Set the baud rate. */
+ for (i = 0; i < ARRAY_SIZE (divisor_tab); i++)
+ if (divisor_tab[i].speed == speed)
+ /* UART in Yeeloong runs twice the usual rate. */
+#ifdef GRUB_MACHINE_MIPS_YEELOONG
+ return 2 * divisor_tab[i].div;
+#else
+ return divisor_tab[i].div;
+#endif
+ return 0;
+}
+
+static void
+do_real_config (struct grub_serial_port *port)
+{
+ int divisor;
+ unsigned char status = 0;
+ const unsigned char parities[] = {
+ [GRUB_SERIAL_PARITY_NONE] = UART_NO_PARITY,
+ [GRUB_SERIAL_PARITY_ODD] = UART_ODD_PARITY,
+ [GRUB_SERIAL_PARITY_EVEN] = UART_EVEN_PARITY
+ };
+ const unsigned char stop_bits[] = {
+ [GRUB_SERIAL_STOP_BITS_1] = UART_1_STOP_BIT,
+ [GRUB_SERIAL_STOP_BITS_2] = UART_2_STOP_BITS,
+ };
+
+ if (port->configured)
+ return;
+
+ divisor = serial_get_divisor (port->config.speed);
+
+ /* Turn off the interrupt. */
+ grub_outb (0, port->port + UART_IER);
+
+ /* Set DLAB. */
+ grub_outb (UART_DLAB, port->port + UART_LCR);
+
+ /* Set the baud rate. */
+ grub_outb (divisor & 0xFF, port->port + UART_DLL);
+ grub_outb (divisor >> 8, port->port + UART_DLH);
+
+ /* Set the line status. */
+ status |= (parities[port->config.parity]
+ | (port->config.word_len - 5)
+ | stop_bits[port->config.stop_bits]);
+ grub_outb (status, port->port + UART_LCR);
+
+ /* In Yeeloong serial port has only 3 wires. */
+#ifndef GRUB_MACHINE_MIPS_YEELOONG
+ /* Enable the FIFO. */
+ grub_outb (UART_ENABLE_FIFO_TRIGGER1, port->port + UART_FCR);
+
+ /* Turn on DTR and RTS. */
+ grub_outb (UART_ENABLE_DTRRTS, port->port + UART_MCR);
+#else
+ /* Enable the FIFO. */
+ grub_outb (UART_ENABLE_FIFO_TRIGGER14, port->port + UART_FCR);
+
+ /* Turn on DTR, RTS, and OUT2. */
+ grub_outb (UART_ENABLE_DTRRTS | UART_ENABLE_OUT2, port->port + UART_MCR);
+#endif
+
+ /* Drain the input buffer. */
+ while (grub_inb (port->port + UART_LSR) & UART_DATA_READY)
+ grub_inb (port->port + UART_RX);
+
+ port->configured = 1;
+}
+
+/* Fetch a key. */
+static int
+serial_hw_fetch (struct grub_serial_port *port)
+{
+ do_real_config (port);
+ if (grub_inb (port->port + UART_LSR) & UART_DATA_READY)
+ return grub_inb (port->port + UART_RX);
+
+ return -1;
+}
+
+/* Put a character. */
+static void
+serial_hw_put (struct grub_serial_port *port, const int c)
+{
+ unsigned int timeout = 100000;
+
+ do_real_config (port);
+
+ /* Wait until the transmitter holding register is empty. */
+ while ((grub_inb (port->port + UART_LSR) & UART_EMPTY_TRANSMITTER) == 0)
+ {
+ if (--timeout == 0)
+ /* There is something wrong. But what can I do? */
+ return;
+ }
+
+ grub_outb (c, port->port + UART_TX);
+}
+
+/* Initialize a serial device. PORT is the port number for a serial device.
+ SPEED is a DTE-DTE speed which must be one of these: 2400, 4800, 9600,
+ 19200, 38400, 57600 and 115200. WORD_LEN is the word length to be used
+ for the device. Likewise, PARITY is the type of the parity and
+ STOP_BIT_LEN is the length of the stop bit. The possible values for
+ WORD_LEN, PARITY and STOP_BIT_LEN are defined in the header file as
+ macros. */
+static grub_err_t
+serial_hw_configure (struct grub_serial_port *port,
+ struct grub_serial_config *config)
+{
+ unsigned short divisor;
+
+ divisor = serial_get_divisor (config->speed);
+ if (divisor == 0)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad speed");
+
+ if (config->parity != GRUB_SERIAL_PARITY_NONE
+ && config->parity != GRUB_SERIAL_PARITY_ODD
+ && config->parity != GRUB_SERIAL_PARITY_EVEN)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "unsupported parity");
+
+ if (config->stop_bits != GRUB_SERIAL_STOP_BITS_1
+ && config->stop_bits != GRUB_SERIAL_STOP_BITS_2)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "unsupported stop bits");
+
+ if (config->word_len < 5 || config->word_len > 8)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "unsupported word length");
+
+ port->config = *config;
+ port->configured = 0;
+
+ /* FIXME: should check if the serial terminal was found. */
+
+ return GRUB_ERR_NONE;
+}
+
+struct grub_serial_driver grub_ns8250_driver =
+ {
+ .configure = serial_hw_configure,
+ .fetch = serial_hw_fetch,
+ .put = serial_hw_put
+ };
+
+static char com_names[GRUB_SERIAL_PORT_NUM][20];
+static struct grub_serial_port com_ports[GRUB_SERIAL_PORT_NUM];
+
+void
+grub_ns8250_init (void)
+{
- int i;
++ unsigned i;
+ for (i = 0; i < GRUB_SERIAL_PORT_NUM; i++)
+ if (serial_hw_io_addr[i])
+ {
+ grub_err_t err;
+ grub_snprintf (com_names[i], sizeof (com_names[i]), "com%d", i);
+ com_ports[i].name = com_names[i];
+ com_ports[i].driver = &grub_ns8250_driver;
+ com_ports[i].port = serial_hw_io_addr[i];
+ err = grub_serial_config_defaults (&com_ports[i]);
+ if (err)
+ grub_print_error ();
+
+ grub_serial_register (&com_ports[i]);
+ }
+}
+
+char *
+grub_serial_ns8250_add_port (grub_port_t port)
+{
+ struct grub_serial_port *p;
++ unsigned i;
+ for (i = 0; i < GRUB_SERIAL_PORT_NUM; i++)
+ if (com_ports[i].port == port)
+ return com_names[i];
+ p = grub_malloc (sizeof (*p));
+ if (!p)
+ return NULL;
+ p->name = grub_xasprintf ("port%lx", (unsigned long) port);
+ if (!p->name)
+ {
+ grub_free (p);
+ return NULL;
+ }
+ p->driver = &grub_ns8250_driver;
+ grub_serial_config_defaults (p);
+ p->port = port;
+ grub_serial_register (p);
+
+ return p->name;
+}
projects / thirdparty / grub.git / commitdiff
