280dedb8d6
The HCDP specs (i.e., PCDP revision < 3) allow zero as a default value for baud rate and data bits. So if firmware doesn't supply them, let early_serial_console_init() probe for them rather than telling it the baud rate is zero. Also, update the URL for the PCDP spec. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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* Parse the EFI PCDP table to locate the console device.
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*
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* (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
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* Khalid Aziz <khalid.aziz@hp.com>
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* Alex Williamson <alex.williamson@hp.com>
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/config.h>
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#include <linux/acpi.h>
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#include <linux/console.h>
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#include <linux/efi.h>
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#include <linux/serial.h>
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#include "pcdp.h"
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static int __init
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setup_serial_console(struct pcdp_uart *uart)
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{
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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int mmio;
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static char options[64], *p = options;
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mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
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p += sprintf(p, "console=uart,%s,0x%lx",
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mmio ? "mmio" : "io", uart->addr.address);
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if (uart->baud)
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p += sprintf(p, ",%lu", uart->baud);
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if (uart->bits)
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p += sprintf(p, "n%d", uart->bits);
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return early_serial_console_init(options);
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#else
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return -ENODEV;
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#endif
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}
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static int __init
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setup_vga_console(struct pcdp_vga *vga)
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{
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#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
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if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) {
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printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
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return -ENODEV;
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}
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conswitchp = &vga_con;
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printk(KERN_INFO "PCDP: VGA console\n");
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return 0;
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#else
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return -ENODEV;
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#endif
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}
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int __init
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efi_setup_pcdp_console(char *cmdline)
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{
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struct pcdp *pcdp;
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struct pcdp_uart *uart;
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struct pcdp_device *dev, *end;
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int i, serial = 0;
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pcdp = efi.hcdp;
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if (!pcdp)
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return -ENODEV;
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printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp));
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if (strstr(cmdline, "console=hcdp")) {
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if (pcdp->rev < 3)
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serial = 1;
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} else if (strstr(cmdline, "console=")) {
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printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
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return -ENODEV;
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}
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if (pcdp->rev < 3 && efi_uart_console_only())
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serial = 1;
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for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
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if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
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if (uart->type == PCDP_CONSOLE_UART) {
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return setup_serial_console(uart);
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}
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}
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}
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end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
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for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
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dev < end;
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dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
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if (dev->flags & PCDP_PRIMARY_CONSOLE) {
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if (dev->type == PCDP_CONSOLE_VGA) {
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return setup_vga_console((struct pcdp_vga *) dev);
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}
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}
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}
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return -ENODEV;
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}
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