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 <asm/vga.h> 19#include "pcdp.h" 20 21static int __init 22setup_serial_console(struct pcdp_uart *uart) 23{ 24#ifdef CONFIG_SERIAL_8250_CONSOLE 25 int mmio; 26 static char options[64], *p = options; 27 char parity; 28 29 mmio = (uart->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); 30 p += sprintf(p, "console=uart,%s,0x%lx", 31 mmio ? "mmio" : "io", uart->addr.address); 32 if (uart->baud) { 33 p += sprintf(p, ",%lu", uart->baud); 34 if (uart->bits) { 35 switch (uart->parity) { 36 case 0x2: parity = 'e'; break; 37 case 0x3: parity = 'o'; break; 38 default: parity = 'n'; 39 } 40 p += sprintf(p, "%c%d", parity, uart->bits); 41 } 42 } 43 44 return early_serial_console_init(options); 45#else 46 return -ENODEV; 47#endif 48} 49 50static int __init 51setup_vga_console(struct pcdp_device *dev) 52{ 53#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) 54 u8 *if_ptr; 55 56 if_ptr = ((u8 *)dev + sizeof(struct pcdp_device)); 57 if (if_ptr[0] == PCDP_IF_PCI) { 58 struct pcdp_if_pci if_pci; 59 60 /* struct copy since ifptr might not be correctly aligned */ 61 62 memcpy(&if_pci, if_ptr, sizeof(if_pci)); 63 64 if (if_pci.trans & PCDP_PCI_TRANS_IOPORT) 65 vga_console_iobase = if_pci.ioport_tra; 66 67 if (if_pci.trans & PCDP_PCI_TRANS_MMIO) 68 vga_console_membase = if_pci.mmio_tra; 69 } 70 71 if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) { 72 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n"); 73 return -ENODEV; 74 } 75 76 conswitchp = &vga_con; 77 printk(KERN_INFO "PCDP: VGA console\n"); 78 return 0; 79#else 80 return -ENODEV; 81#endif 82} 83 84int __init 85efi_setup_pcdp_console(char *cmdline) 86{ 87 struct pcdp *pcdp; 88 struct pcdp_uart *uart; 89 struct pcdp_device *dev, *end; 90 int i, serial = 0; 91 int rc = -ENODEV; 92 93 if (efi.hcdp == EFI_INVALID_TABLE_ADDR) 94 return -ENODEV; 95 96 pcdp = ioremap(efi.hcdp, 4096); 97 printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp); 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 goto out; 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 rc = setup_serial_console(uart); 114 goto out; 115 } 116 } 117 } 118 119 end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length); 120 for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts); 121 dev < end; 122 dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) { 123 if (dev->flags & PCDP_PRIMARY_CONSOLE) { 124 if (dev->type == PCDP_CONSOLE_VGA) { 125 rc = setup_vga_console(dev); 126 goto out; 127 } 128 } 129 } 130 131out: 132 iounmap(pcdp); 133 return rc; 134} 135