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/*
* C-Brick Serial Port (and console) driver for SGI Altix machines.
*
* Copyright (c) 2005 Silicon Graphics, Inc. All Rights Reserved.
*/
#include <asm/acpi.h>
#include <asm/sn/sn_sal.h>
#include <xen/serial.h>
void sn_putc(struct serial_port *, char);
static struct uart_driver sn_sal_console = {
.putc = sn_putc,
};
/**
* early_sn_setup - early setup routine for SN platforms
*
* pulled from arch/ia64/sn/kernel/setup.c
*/
static void __init early_sn_setup(void)
{
efi_system_table_t *efi_systab;
efi_config_table_t *config_tables;
struct ia64_sal_systab *sal_systab;
struct ia64_sal_desc_entry_point *ep;
char *p;
int i, j;
/*
* Parse enough of the SAL tables to locate the SAL entry point. Since, console
* IO on SN2 is done via SAL calls, early_printk won't work without this.
*
* This code duplicates some of the ACPI table parsing that is in efi.c & sal.c.
* Any changes to those file may have to be made hereas well.
*/
efi_systab = (efi_system_table_t *) __va(ia64_boot_param->efi_systab);
config_tables = __va(efi_systab->tables);
for (i = 0; i < efi_systab->nr_tables; i++) {
if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) ==
0) {
sal_systab = __va(config_tables[i].table);
p = (char *)(sal_systab + 1);
for (j = 0; j < sal_systab->entry_count; j++) {
if (*p == SAL_DESC_ENTRY_POINT) {
ep = (struct ia64_sal_desc_entry_point
*)p;
ia64_sal_handler_init(__va
(ep->sal_proc),
__va(ep->gp));
return;
}
p += SAL_DESC_SIZE(*p);
}
}
}
/* Uh-oh, SAL not available?? */
printk(KERN_ERR "failed to find SAL entry point\n");
}
/**
* sn_serial_console_early_setup - Sets up early console output support
*
* pulled from drivers/serial/sn_console.c
*/
int __init sn_serial_console_early_setup(void)
{
if (strcmp("sn2",acpi_get_sysname()))
return -1;
early_sn_setup(); /* Find SAL entry points */
serial_register_uart(0, &sn_sal_console, NULL);
return 0;
}
/*
* sn_putc - Send a character to the console, polled or interrupt mode
*/
void sn_putc(struct serial_port *port, char c)
{
return ia64_sn_console_putc(c);
}
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