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