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/*
* Copyright (C) 2025 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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.
*
* 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_OR_UBDL );
#include <errno.h>
#include <ipxe/serial.h>
#include <ipxe/pci.h>
#include <ipxe/ns16550.h>
#include <ipxe/spcr.h>
/** @file
*
* ACPI Serial Port Console Redirection (SPCR)
*
*/
#ifdef SERIAL_SPCR
#define SERIAL_PREFIX_spcr
#else
#define SERIAL_PREFIX_spcr __spcr_
#endif
/** SPCR-defined UART */
static struct uart spcr_uart = {
.refcnt = REF_INIT ( ref_no_free ),
.name = "SPCR",
};
/** SPCR-defined 16550 UART */
static struct ns16550_uart spcr_ns16550 = {
.clock = NS16550_CLK_DEFAULT,
};
/** Base baud rate for SPCR divisors */
#define SPCR_BAUD_BASE 115200
/** SPCR baud rate divisors */
static const uint8_t spcr_baud_divisor[SPCR_BAUD_MAX] = {
[SPCR_BAUD_2400] = ( SPCR_BAUD_BASE / 2400 ),
[SPCR_BAUD_4800] = ( SPCR_BAUD_BASE / 4800 ),
[SPCR_BAUD_9600] = ( SPCR_BAUD_BASE / 9600 ),
[SPCR_BAUD_19200] = ( SPCR_BAUD_BASE / 19200 ),
[SPCR_BAUD_38400] = ( SPCR_BAUD_BASE / 38400 ),
[SPCR_BAUD_57600] = ( SPCR_BAUD_BASE / 57600 ),
[SPCR_BAUD_115200] = ( SPCR_BAUD_BASE / 115200 ),
};
/**
* Configure 16550-based serial console
*
* @v spcr SPCR table
* @v uart UART to configure
* @ret rc Return status code
*/
static int spcr_16550 ( struct spcr_table *spcr, struct uart *uart ) {
struct ns16550_uart *ns16550 = &spcr_ns16550;
/* Set base address */
ns16550->base = acpi_ioremap ( &spcr->base, NS16550_LEN );
if ( ! ns16550->base ) {
DBGC ( uart, "SPCR could not map registers\n" );
return -ENODEV;
}
/* Set clock frequency, if specified */
if ( spcr->clock )
ns16550->clock = le32_to_cpu ( spcr->clock );
/* Configure UART as a 16550 */
uart->op = &ns16550_operations;
uart->priv = ns16550;
return 0;
}
/**
* Identify default serial console
*
* @ret uart Default serial console UART, or NULL
*/
static struct uart * spcr_console ( void ) {
struct uart *uart = &spcr_uart;
struct spcr_table *spcr;
unsigned int baud;
int rc;
/* Locate SPCR table */
spcr = container_of ( acpi_table ( SPCR_SIGNATURE, 0 ),
struct spcr_table, acpi );
if ( ! spcr ) {
DBGC ( uart, "SPCR found no table\n" );
goto err_table;
}
DBGC2 ( uart, "SPCR found table:\n" );
DBGC2_HDA ( uart, 0, spcr, sizeof ( *spcr ) );
DBGC ( uart, "SPCR is type %d at %02x:%08llx\n",
spcr->type, spcr->base.type,
( ( unsigned long long ) le64_to_cpu ( spcr->base.address ) ) );
if ( spcr->pci_vendor_id != cpu_to_le16 ( PCI_ANY_ID ) ) {
DBGC ( uart, "SPCR is PCI " PCI_FMT " (%04x:%04x)\n",
spcr->pci_segment, spcr->pci_bus, spcr->pci_dev,
spcr->pci_func, le16_to_cpu ( spcr->pci_vendor_id ),
le16_to_cpu ( spcr->pci_device_id ) );
}
/* Get baud rate */
baud = 0;
if ( le32_to_cpu ( spcr->acpi.length ) >=
( offsetof ( typeof ( *spcr ), precise ) +
sizeof ( spcr->precise ) ) ) {
baud = le32_to_cpu ( spcr->precise );
if ( baud )
DBGC ( uart, "SPCR has precise baud rate %d\n", baud );
}
if ( ( ! baud ) && spcr->baud && ( spcr->baud < SPCR_BAUD_MAX ) ) {
baud = ( SPCR_BAUD_BASE / spcr_baud_divisor[spcr->baud] );
DBGC ( uart, "SPCR has baud rate %d\n", baud );
}
uart->baud = baud;
/* Initialise according to type */
switch ( spcr->type ) {
case SPCR_TYPE_16550:
case SPCR_TYPE_16450:
case SPCR_TYPE_16550_GAS:
if ( ( rc = spcr_16550 ( spcr, uart ) ) != 0 )
goto err_type;
break;
default:
DBGC ( uart, "SPCR unsupported type %d\n", spcr->type );
goto err_type;
}
return uart;
err_type:
err_table:
/* Fall back to using fixed serial console */
return fixed_serial_console();
}
PROVIDE_SERIAL ( spcr, default_serial_console, spcr_console );
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