| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| Peter Chubb | 97d3a00 | 2005-05-31 14:39:30 -0700 | [diff] [blame] | 14 | #include <linux/config.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/acpi.h> |
| 16 | #include <linux/console.h> |
| 17 | #include <linux/efi.h> |
| 18 | #include <linux/serial.h> |
| 19 | #include "pcdp.h" |
| 20 | |
| 21 | static int __init |
| 22 | setup_serial_console(struct pcdp_uart *uart) |
| 23 | { |
| 24 | #ifdef CONFIG_SERIAL_8250_CONSOLE |
| 25 | int mmio; |
| 26 | static char options[64]; |
| 27 | |
| 28 | mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); |
| 29 | snprintf(options, sizeof(options), "console=uart,%s,0x%lx,%lun%d", |
| 30 | mmio ? "mmio" : "io", uart->addr.address, uart->baud, |
| 31 | uart->bits ? uart->bits : 8); |
| 32 | |
| 33 | return early_serial_console_init(options); |
| 34 | #else |
| 35 | return -ENODEV; |
| 36 | #endif |
| 37 | } |
| 38 | |
| 39 | static int __init |
| 40 | setup_vga_console(struct pcdp_vga *vga) |
| 41 | { |
| 42 | #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) |
| 43 | if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) { |
| 44 | printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n"); |
| 45 | return -ENODEV; |
| 46 | } |
| 47 | |
| 48 | conswitchp = &vga_con; |
| 49 | printk(KERN_INFO "PCDP: VGA console\n"); |
| 50 | return 0; |
| 51 | #else |
| 52 | return -ENODEV; |
| 53 | #endif |
| 54 | } |
| 55 | |
| 56 | int __init |
| 57 | efi_setup_pcdp_console(char *cmdline) |
| 58 | { |
| 59 | struct pcdp *pcdp; |
| 60 | struct pcdp_uart *uart; |
| 61 | struct pcdp_device *dev, *end; |
| 62 | int i, serial = 0; |
| 63 | |
| 64 | pcdp = efi.hcdp; |
| 65 | if (!pcdp) |
| 66 | return -ENODEV; |
| 67 | |
| 68 | printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp)); |
| 69 | |
| 70 | if (strstr(cmdline, "console=hcdp")) { |
| 71 | if (pcdp->rev < 3) |
| 72 | serial = 1; |
| 73 | } else if (strstr(cmdline, "console=")) { |
| 74 | printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n"); |
| 75 | return -ENODEV; |
| 76 | } |
| 77 | |
| 78 | if (pcdp->rev < 3 && efi_uart_console_only()) |
| 79 | serial = 1; |
| 80 | |
| 81 | for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) { |
| 82 | if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) { |
| 83 | if (uart->type == PCDP_CONSOLE_UART) { |
| 84 | return setup_serial_console(uart); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length); |
| 90 | for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts); |
| 91 | dev < end; |
| 92 | dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) { |
| 93 | if (dev->flags & PCDP_PRIMARY_CONSOLE) { |
| 94 | if (dev->type == PCDP_CONSOLE_VGA) { |
| 95 | return setup_vga_console((struct pcdp_vga *) dev); |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | return -ENODEV; |
| 101 | } |