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/config.h> 15 #include <linux/acpi.h> 16 #include <linux/console.h> 17 #include <linux/efi.h> 18 #include <linux/serial.h> 19 #include <asm/vga.h> 20 #include "pcdp.h" 21 22 static int __init 23 setup_serial_console(struct pcdp_uart *uart) 24 { 25 #ifdef CONFIG_SERIAL_8250_CONSOLE 26 int mmio; 27 static char options[64], *p = options; 28 char parity; 29 30 mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); 31 p += sprintf(p, "console=uart,%s,0x%lx", 32 mmio ? "mmio" : "io", uart->addr.address); 33 if (uart->baud) { 34 p += sprintf(p, ",%lu", uart->baud); 35 if (uart->bits) { 36 switch (uart->parity) { 37 case 0x2: parity = 'e'; break; 38 case 0x3: parity = 'o'; break; 39 default: parity = 'n'; 40 } 41 p += sprintf(p, "%c%d", parity, uart->bits); 42 } 43 } 44 45 return early_serial_console_init(options); 46 #else 47 return -ENODEV; 48 #endif 49 } 50 51 static int __init 52 setup_vga_console(struct pcdp_device *dev) 53 { 54 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) 55 u8 *if_ptr; 56 57 if_ptr = ((u8 *)dev + sizeof(struct pcdp_device)); 58 if (if_ptr[0] == PCDP_IF_PCI) { 59 struct pcdp_if_pci if_pci; 60 61 /* struct copy since ifptr might not be correctly aligned */ 62 63 memcpy(&if_pci, if_ptr, sizeof(if_pci)); 64 65 if (if_pci.trans & PCDP_PCI_TRANS_IOPORT) 66 vga_console_iobase = if_pci.ioport_tra; 67 68 if (if_pci.trans & PCDP_PCI_TRANS_MMIO) 69 vga_console_membase = if_pci.mmio_tra; 70 } 71 72 if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) { 73 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n"); 74 return -ENODEV; 75 } 76 77 conswitchp = &vga_con; 78 printk(KERN_INFO "PCDP: VGA console\n"); 79 return 0; 80 #else 81 return -ENODEV; 82 #endif 83 } 84 85 int __init 86 efi_setup_pcdp_console(char *cmdline) 87 { 88 struct pcdp *pcdp; 89 struct pcdp_uart *uart; 90 struct pcdp_device *dev, *end; 91 int i, serial = 0; 92 93 pcdp = efi.hcdp; 94 if (!pcdp) 95 return -ENODEV; 96 97 printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp)); 98 99 if (strstr(cmdline, "console=hcdp")) { 100 if (pcdp->rev < 3) 101 serial = 1; 102 } else if (strstr(cmdline, "console=")) { 103 printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n"); 104 return -ENODEV; 105 } 106 107 if (pcdp->rev < 3 && efi_uart_console_only()) 108 serial = 1; 109 110 for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) { 111 if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) { 112 if (uart->type == PCDP_CONSOLE_UART) { 113 return setup_serial_console(uart); 114 } 115 } 116 } 117 118 end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length); 119 for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts); 120 dev < end; 121 dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) { 122 if (dev->flags & PCDP_PRIMARY_CONSOLE) { 123 if (dev->type == PCDP_CONSOLE_VGA) { 124 return setup_vga_console(dev); 125 } 126 } 127 } 128 129 return -ENODEV; 130 } 131