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 <linux/serial_core.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.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); 31 p += sprintf(p, "uart8250,%s,0x%llx", 32 mmio ? "mmio" : "io", uart->addr.address); 33 if (uart->baud) { 34 p += sprintf(p, ",%llu", 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 add_preferred_console("uart", 8250, &options[9]); 46 return setup_earlycon(options); 47 #else 48 return -ENODEV; 49 #endif 50 } 51 52 static int __init 53 setup_vga_console(struct pcdp_device *dev) 54 { 55 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) 56 u8 *if_ptr; 57 58 if_ptr = ((u8 *)dev + sizeof(struct pcdp_device)); 59 if (if_ptr[0] == PCDP_IF_PCI) { 60 struct pcdp_if_pci if_pci; 61 62 /* struct copy since ifptr might not be correctly aligned */ 63 64 memcpy(&if_pci, if_ptr, sizeof(if_pci)); 65 66 if (if_pci.trans & PCDP_PCI_TRANS_IOPORT) 67 vga_console_iobase = if_pci.ioport_tra; 68 69 if (if_pci.trans & PCDP_PCI_TRANS_MMIO) 70 vga_console_membase = if_pci.mmio_tra; 71 } 72 73 if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) { 74 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n"); 75 return -ENODEV; 76 } 77 78 conswitchp = &vga_con; 79 printk(KERN_INFO "PCDP: VGA console\n"); 80 return 0; 81 #else 82 return -ENODEV; 83 #endif 84 } 85 86 int __init 87 efi_setup_pcdp_console(char *cmdline) 88 { 89 struct pcdp *pcdp; 90 struct pcdp_uart *uart; 91 struct pcdp_device *dev, *end; 92 int i, serial = 0; 93 int rc = -ENODEV; 94 95 if (efi.hcdp == EFI_INVALID_TABLE_ADDR) 96 return -ENODEV; 97 98 pcdp = early_memremap(efi.hcdp, 4096); 99 printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp); 100 101 if (strstr(cmdline, "console=hcdp")) { 102 if (pcdp->rev < 3) 103 serial = 1; 104 } else if (strstr(cmdline, "console=")) { 105 printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n"); 106 goto out; 107 } 108 109 if (pcdp->rev < 3 && efi_uart_console_only()) 110 serial = 1; 111 112 for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) { 113 if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) { 114 if (uart->type == PCDP_CONSOLE_UART) { 115 rc = setup_serial_console(uart); 116 goto out; 117 } 118 } 119 } 120 121 end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length); 122 for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts); 123 dev < end; 124 dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) { 125 if (dev->flags & PCDP_PRIMARY_CONSOLE) { 126 if (dev->type == PCDP_CONSOLE_VGA) { 127 rc = setup_vga_console(dev); 128 goto out; 129 } 130 } 131 } 132 133 out: 134 early_memunmap(pcdp, 4096); 135 return rc; 136 } 137