1 /* 2 * Parse the EFI PCDP table to locate the console device. 3 * 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> 8 * 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. 12 */ 13 14 #include <linux/acpi.h> 15 #include <linux/console.h> 16 #include <linux/efi.h> 17 #include <linux/serial.h> 18 #include "pcdp.h" 19 20 static int __init 21 setup_serial_console(struct pcdp_uart *uart) 22 { 23 #ifdef CONFIG_SERIAL_8250_CONSOLE 24 int mmio; 25 static char options[64]; 26 27 mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); 28 snprintf(options, sizeof(options), "console=uart,%s,0x%lx,%lun%d", 29 mmio ? "mmio" : "io", uart->addr.address, uart->baud, 30 uart->bits ? uart->bits : 8); 31 32 return early_serial_console_init(options); 33 #else 34 return -ENODEV; 35 #endif 36 } 37 38 static int __init 39 setup_vga_console(struct pcdp_vga *vga) 40 { 41 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) 42 if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) { 43 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n"); 44 return -ENODEV; 45 } 46 47 conswitchp = &vga_con; 48 printk(KERN_INFO "PCDP: VGA console\n"); 49 return 0; 50 #else 51 return -ENODEV; 52 #endif 53 } 54 55 int __init 56 efi_setup_pcdp_console(char *cmdline) 57 { 58 struct pcdp *pcdp; 59 struct pcdp_uart *uart; 60 struct pcdp_device *dev, *end; 61 int i, serial = 0; 62 63 pcdp = efi.hcdp; 64 if (!pcdp) 65 return -ENODEV; 66 67 printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp)); 68 69 if (strstr(cmdline, "console=hcdp")) { 70 if (pcdp->rev < 3) 71 serial = 1; 72 } else if (strstr(cmdline, "console=")) { 73 printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n"); 74 return -ENODEV; 75 } 76 77 if (pcdp->rev < 3 && efi_uart_console_only()) 78 serial = 1; 79 80 for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) { 81 if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) { 82 if (uart->type == PCDP_CONSOLE_UART) { 83 return setup_serial_console(uart); 84 } 85 } 86 } 87 88 end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length); 89 for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts); 90 dev < end; 91 dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) { 92 if (dev->flags & PCDP_PRIMARY_CONSOLE) { 93 if (dev->type == PCDP_CONSOLE_VGA) { 94 return setup_vga_console((struct pcdp_vga *) dev); 95 } 96 } 97 } 98 99 return -ENODEV; 100 } 101