/* * 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/config.h> #include <linux/acpi.h> #include <linux/console.h> #include <linux/efi.h> #include <linux/serial.h> #include <asm/vga.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], *p = options; char parity; mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); p += sprintf(p, "console=uart,%s,0x%lx", mmio ? "mmio" : "io", uart->addr.address); if (uart->baud) { p += sprintf(p, ",%lu", uart->baud); if (uart->bits) { switch (uart->parity) { case 0x2: parity = 'e'; break; case 0x3: parity = 'o'; break; default: parity = 'n'; } p += sprintf(p, "%c%d", parity, uart->bits); } } return early_serial_console_init(options); #else return -ENODEV; #endif } static int __init setup_vga_console(struct pcdp_device *dev) { #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) u8 *if_ptr; if_ptr = ((u8 *)dev + sizeof(struct pcdp_device)); if (if_ptr[0] == PCDP_IF_PCI) { struct pcdp_if_pci if_pci; /* struct copy since ifptr might not be correctly aligned */ memcpy(&if_pci, if_ptr, sizeof(if_pci)); if (if_pci.trans & PCDP_PCI_TRANS_IOPORT) vga_console_iobase = if_pci.ioport_tra; if (if_pci.trans & PCDP_PCI_TRANS_MMIO) vga_console_membase = if_pci.mmio_tra; } if (efi_mem_type(vga_console_membase + 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(dev); } } } return -ENODEV; }