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/*
* Parse the EFI PCDP table to locate the console device.
*
* (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
* Khalid Aziz <khalid.aziz@hp.com>
* Alex Williamson <alex.williamson@hp.com>
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/acpi.h>
#include <linux/console.h>
#include <linux/efi.h>
#include <linux/serial.h>
#include "pcdp.h"
static int __init
setup_serial_console(struct pcdp_uart *uart)
{
#ifdef CONFIG_SERIAL_8250_CONSOLE
int mmio;
static char options[64];
mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
snprintf(options, sizeof(options), "console=uart,%s,0x%lx,%lun%d",
mmio ? "mmio" : "io", uart->addr.address, uart->baud,
uart->bits ? uart->bits : 8);
return early_serial_console_init(options);
#else
return -ENODEV;
#endif
}
static int __init
setup_vga_console(struct pcdp_vga *vga)
{
#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) {
printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
return -ENODEV;
}
conswitchp = &vga_con;
printk(KERN_INFO "PCDP: VGA console\n");
return 0;
#else
return -ENODEV;
#endif
}
int __init
efi_setup_pcdp_console(char *cmdline)
{
struct pcdp *pcdp;
struct pcdp_uart *uart;
struct pcdp_device *dev, *end;
int i, serial = 0;
pcdp = efi.hcdp;
if (!pcdp)
return -ENODEV;
printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp));
if (strstr(cmdline, "console=hcdp")) {
if (pcdp->rev < 3)
serial = 1;
} else if (strstr(cmdline, "console=")) {
printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
return -ENODEV;
}
if (pcdp->rev < 3 && efi_uart_console_only())
serial = 1;
for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
if (uart->type == PCDP_CONSOLE_UART) {
return setup_serial_console(uart);
}
}
}
end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
dev < end;
dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
if (dev->flags & PCDP_PRIMARY_CONSOLE) {
if (dev->type == PCDP_CONSOLE_VGA) {
return setup_vga_console((struct pcdp_vga *) dev);
}
}
}
return -ENODEV;
}
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