/*
- * The serial port interface routines implement a simple polled i/o
- * interface to a standard serial port. Due to the space restrictions
- * for the boot blocks, no BIOS support is used (since BIOS requires
- * expensive real/protected mode switches), instead the rudimentary
- * BIOS support is duplicated here.
+ * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
*
- * The base address and speed for the i/o port are passed from the
- * Makefile in the COMCONSOLE and CONSPEED preprocessor macros. The
- * line control parameters are currently hard-coded to 8 bits, no
- * parity, 1 stop bit (8N1). This can be changed in init_serial().
+ * 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 any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
*/
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** @file
+ *
+ * Serial console
+ *
+ */
-#include "stddef.h"
+#include <stddef.h>
#include <ipxe/init.h>
-#include <ipxe/io.h>
-#include <unistd.h>
+#include <ipxe/uart.h>
+#include <ipxe/console.h>
#include <ipxe/serial.h>
-#include "config/serial.h"
-
-/* Set default values if none specified */
+#include <config/console.h>
+#include <config/serial.h>
-#ifndef COMCONSOLE
-#define COMCONSOLE 0x3f8
+/* Set default console usage if applicable */
+#if ! ( defined ( CONSOLE_SERIAL ) && CONSOLE_EXPLICIT ( CONSOLE_SERIAL ) )
+#undef CONSOLE_SERIAL
+#define CONSOLE_SERIAL ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
#endif
-#ifndef COMSPEED
-#define COMSPEED 9600
-#endif
-
-#ifndef COMDATA
-#define COMDATA 8
+/* UART port number */
+#ifdef COMCONSOLE
+#define CONSOLE_PORT COMCONSOLE
+#else
+#define CONSOLE_PORT 0
#endif
-#ifndef COMPARITY
-#define COMPARITY 0
+/* UART baud rate */
+#ifdef COMPRESERVE
+#define CONSOLE_BAUD 0
+#else
+#define CONSOLE_BAUD COMSPEED
#endif
-#ifndef COMSTOP
-#define COMSTOP 1
+/* UART line control register value */
+#ifdef COMPRESERVE
+#define CONSOLE_LCR 0
+#else
+#define CONSOLE_LCR UART_LCR_WPS ( COMDATA, COMPARITY, COMSTOP )
#endif
-#undef UART_BASE
-#define UART_BASE ( COMCONSOLE )
-
-#undef UART_BAUD
-#define UART_BAUD ( COMSPEED )
+/** Serial console UART */
+struct uart serial_console;
-#if ((115200%UART_BAUD) != 0)
-#error Bad ttys0 baud rate
-#endif
-
-#define COMBRD (115200/UART_BAUD)
+/**
+ * Print a character to serial console
+ *
+ * @v character Character to be printed
+ */
+static void serial_putchar ( int character ) {
-/* Line Control Settings */
-#define UART_LCS ( ( ( (COMDATA) - 5 ) << 0 ) | \
- ( ( (COMPARITY) ) << 3 ) | \
- ( ( (COMSTOP) - 1 ) << 2 ) )
+ /* Do nothing if we have no UART */
+ if ( ! serial_console.base )
+ return;
-/* Data */
-#define UART_RBR 0x00
-#define UART_TBR 0x00
+ /* Transmit character */
+ uart_transmit ( &serial_console, character );
+}
-/* Control */
-#define UART_IER 0x01
-#define UART_IIR 0x02
-#define UART_FCR 0x02
-#define UART_LCR 0x03
-#define UART_MCR 0x04
-#define UART_DLL 0x00
-#define UART_DLM 0x01
+/**
+ * Get character from serial console
+ *
+ * @ret character Character read from console
+ */
+static int serial_getchar ( void ) {
+ uint8_t data;
-/* Status */
-#define UART_LSR 0x05
-#define UART_LSR_TEMPT 0x40 /* Transmitter empty */
-#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
-#define UART_LSR_BI 0x10 /* Break interrupt indicator */
-#define UART_LSR_FE 0x08 /* Frame error indicator */
-#define UART_LSR_PE 0x04 /* Parity error indicator */
-#define UART_LSR_OE 0x02 /* Overrun error indicator */
-#define UART_LSR_DR 0x01 /* Receiver data ready */
+ /* Do nothing if we have no UART */
+ if ( ! serial_console.base )
+ return 0;
-#define UART_MSR 0x06
-#define UART_SCR 0x07
+ /* Wait for data to be ready */
+ while ( ! uart_data_ready ( &serial_console ) ) {}
-#if defined(UART_MEM)
-#define uart_readb(addr) readb((addr))
-#define uart_writeb(val,addr) writeb((val),(addr))
-#else
-#define uart_readb(addr) inb((addr))
-#define uart_writeb(val,addr) outb((val),(addr))
-#endif
+ /* Receive data */
+ data = uart_receive ( &serial_console );
-/* Boolean for the state of serial driver initialization */
-int serial_initialized = 0;
+ /* Strip any high bit and convert DEL to backspace */
+ data &= 0x7f;
+ if ( data == 0x7f )
+ data = 0x08;
-/*
- * void serial_putc(int ch);
- * Write character `ch' to port UART_BASE.
- */
-void serial_putc ( int ch ) {
- int i;
- int status;
- i = 1000; /* timeout */
- while(--i > 0) {
- status = uart_readb(UART_BASE + UART_LSR);
- if (status & UART_LSR_THRE) {
- /* TX buffer emtpy */
- uart_writeb(ch, UART_BASE + UART_TBR);
- break;
- }
- mdelay(2);
- }
+ return data;
}
-/*
- * int serial_getc(void);
- * Read a character from port UART_BASE.
- */
-int serial_getc ( void ) {
- int status;
- int ch;
- do {
- status = uart_readb(UART_BASE + UART_LSR);
- } while((status & 1) == 0);
- ch = uart_readb(UART_BASE + UART_RBR); /* fetch (first) character */
- ch &= 0x7f; /* remove any parity bits we get */
- if (ch == 0x7f) { /* Make DEL... look like BS */
- ch = 0x08;
- }
- return ch;
-}
-
-/*
- * int serial_ischar(void);
- * If there is a character in the input buffer of port UART_BASE,
- * return nonzero; otherwise return 0.
+/**
+ * Check for character ready to read from serial console
+ *
+ * @ret True Character available to read
+ * @ret False No character available to read
*/
-int serial_ischar ( void ) {
- int status;
- status = uart_readb(UART_BASE + UART_LSR); /* line status reg; */
- return status & 1; /* rx char available */
-}
+static int serial_iskey ( void ) {
-/*
- * int serial_init(void);
- * Initialize port UART_BASE to speed COMSPEED, line settings 8N1.
- */
-static void serial_init ( void ) {
- int status;
- int divisor, lcs;
+ /* Do nothing if we have no UART */
+ if ( ! serial_console.base )
+ return 0;
- DBG ( "Serial port %#x initialising\n", UART_BASE );
+ /* Check UART */
+ return uart_data_ready ( &serial_console );
+}
- divisor = COMBRD;
- lcs = UART_LCS;
+/** Serial console */
+struct console_driver serial_console_driver __console_driver = {
+ .putchar = serial_putchar,
+ .getchar = serial_getchar,
+ .iskey = serial_iskey,
+ .usage = CONSOLE_SERIAL,
+};
+/** Initialise serial console */
+static void serial_init ( void ) {
+ int rc;
-#ifdef COMPRESERVE
- lcs = uart_readb(UART_BASE + UART_LCR) & 0x7f;
- uart_writeb(0x80 | lcs, UART_BASE + UART_LCR);
- divisor = (uart_readb(UART_BASE + UART_DLM) << 8) | uart_readb(UART_BASE + UART_DLL);
- uart_writeb(lcs, UART_BASE + UART_LCR);
-#endif
+ /* Do nothing if we have no default port */
+ if ( ! CONSOLE_PORT )
+ return;
- /* Set Baud Rate Divisor to COMSPEED, and test to see if the
- * serial port appears to be present.
- */
- uart_writeb(0x80 | lcs, UART_BASE + UART_LCR);
- uart_writeb(0xaa, UART_BASE + UART_DLL);
- if (uart_readb(UART_BASE + UART_DLL) != 0xaa) {
- DBG ( "Serial port %#x UART_DLL failed\n", UART_BASE );
- goto out;
- }
- uart_writeb(0x55, UART_BASE + UART_DLL);
- if (uart_readb(UART_BASE + UART_DLL) != 0x55) {
- DBG ( "Serial port %#x UART_DLL failed\n", UART_BASE );
- goto out;
+ /* Select UART */
+ if ( ( rc = uart_select ( &serial_console, CONSOLE_PORT ) ) != 0 ) {
+ DBG ( "Could not select UART %d: %s\n",
+ CONSOLE_PORT, strerror ( rc ) );
+ return;
}
- uart_writeb(divisor & 0xff, UART_BASE + UART_DLL);
- if (uart_readb(UART_BASE + UART_DLL) != (divisor & 0xff)) {
- DBG ( "Serial port %#x UART_DLL failed\n", UART_BASE );
- goto out;
- }
- uart_writeb(0xaa, UART_BASE + UART_DLM);
- if (uart_readb(UART_BASE + UART_DLM) != 0xaa) {
- DBG ( "Serial port %#x UART_DLM failed\n", UART_BASE );
- goto out;
- }
- uart_writeb(0x55, UART_BASE + UART_DLM);
- if (uart_readb(UART_BASE + UART_DLM) != 0x55) {
- DBG ( "Serial port %#x UART_DLM failed\n", UART_BASE );
- goto out;
- }
- uart_writeb((divisor >> 8) & 0xff, UART_BASE + UART_DLM);
- if (uart_readb(UART_BASE + UART_DLM) != ((divisor >> 8) & 0xff)) {
- DBG ( "Serial port %#x UART_DLM failed\n", UART_BASE );
- goto out;
- }
- uart_writeb(lcs, UART_BASE + UART_LCR);
-
- /* disable interrupts */
- uart_writeb(0x0, UART_BASE + UART_IER);
- /* enable fifos */
- uart_writeb(0x01, UART_BASE + UART_FCR);
+ /* Initialise UART */
+ if ( ( rc = uart_init ( &serial_console, CONSOLE_BAUD,
+ CONSOLE_LCR ) ) != 0 ) {
+ DBG ( "Could not initialise UART %d baud %d LCR %#02x: %s\n",
+ CONSOLE_PORT, CONSOLE_BAUD, CONSOLE_LCR, strerror ( rc ));
+ return;
+ }
+}
- /* Set clear to send, so flow control works... */
- uart_writeb((1<<1), UART_BASE + UART_MCR);
+/**
+ * Shut down serial console
+ *
+ * @v flags Shutdown flags
+ */
+static void serial_shutdown ( int flags __unused ) {
- /* Flush the input buffer. */
- do {
- /* rx buffer reg
- * throw away (unconditionally the first time)
- */
- (void) uart_readb(UART_BASE + UART_RBR);
- /* line status reg */
- status = uart_readb(UART_BASE + UART_LSR);
- } while(status & UART_LSR_DR);
+ /* Do nothing if we have no UART */
+ if ( ! serial_console.base )
+ return;
- /* Note that serial support has been initialized */
- serial_initialized = 1;
- out:
- return;
-}
+ /* Flush any pending output */
+ uart_flush ( &serial_console );
-/*
- * void serial_fini(void);
- * Cleanup our use of the serial port, in particular flush the
- * output buffer so we don't accidentially lose characters.
- */
-static void serial_fini ( int flags __unused ) {
- int i, status;
- /* Flush the output buffer to avoid dropping characters,
- * if we are reinitializing the serial port.
- */
- i = 10000; /* timeout */
- do {
- status = uart_readb(UART_BASE + UART_LSR);
- } while((--i > 0) && !(status & UART_LSR_TEMPT));
- /* Don't mark it as disabled; it's still usable */
+ /* Leave console enabled; it's still usable */
}
-/**
- * Serial driver initialisation function
- *
- * Initialise serial port early on so that it is available to capture
- * early debug messages.
- */
-struct init_fn serial_init_fn __init_fn ( INIT_SERIAL ) = {
+/** Serial console initialisation function */
+struct init_fn serial_console_init_fn __init_fn ( INIT_CONSOLE ) = {
.initialise = serial_init,
};
-/** Serial driver startup function */
+/** Serial console startup function */
struct startup_fn serial_startup_fn __startup_fn ( STARTUP_EARLY ) = {
- .shutdown = serial_fini,
+ .shutdown = serial_shutdown,
};
Code Review / kvmfornfv.git / blobdiff