projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 97d3a00f | 14 | #include <linux/config.h> |
| 1da177e4 LT |
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 | } |