2 * Parse the EFI PCDP table to locate the console device.
4 * (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
5 * Khalid Aziz <khalid.aziz@hp.com>
6 * Alex Williamson <alex.williamson@hp.com>
7 * Bjorn Helgaas <bjorn.helgaas@hp.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/config.h>
15 #include <linux/acpi.h>
16 #include <linux/console.h>
17 #include <linux/efi.h>
18 #include <linux/serial.h>
22 setup_serial_console(struct pcdp_uart *uart)
24 #ifdef CONFIG_SERIAL_8250_CONSOLE
26 static char options[64], *p = options;
28 mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
29 p += sprintf(p, "console=uart,%s,0x%lx",
30 mmio ? "mmio" : "io", uart->addr.address);
32 p += sprintf(p, ",%lu", uart->baud);
34 p += sprintf(p, "n%d", uart->bits);
36 return early_serial_console_init(options);
43 setup_vga_console(struct pcdp_vga *vga)
45 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
46 if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) {
47 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
51 conswitchp = &vga_con;
52 printk(KERN_INFO "PCDP: VGA console\n");
60 efi_setup_pcdp_console(char *cmdline)
63 struct pcdp_uart *uart;
64 struct pcdp_device *dev, *end;
71 printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp));
73 if (strstr(cmdline, "console=hcdp")) {
76 } else if (strstr(cmdline, "console=")) {
77 printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
81 if (pcdp->rev < 3 && efi_uart_console_only())
84 for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
85 if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
86 if (uart->type == PCDP_CONSOLE_UART) {
87 return setup_serial_console(uart);
92 end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
93 for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
95 dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
96 if (dev->flags & PCDP_PRIMARY_CONSOLE) {
97 if (dev->type == PCDP_CONSOLE_VGA) {
98 return setup_vga_console((struct pcdp_vga *) dev);