Commit | Line | Data |
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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; | |
280dedb8 | 26 | static char options[64], *p = options; |
1da177e4 LT |
27 | |
28 | mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); | |
280dedb8 BH |
29 | p += sprintf(p, "console=uart,%s,0x%lx", |
30 | mmio ? "mmio" : "io", uart->addr.address); | |
31 | if (uart->baud) | |
32 | p += sprintf(p, ",%lu", uart->baud); | |
33 | if (uart->bits) | |
34 | p += sprintf(p, "n%d", uart->bits); | |
1da177e4 LT |
35 | |
36 | return early_serial_console_init(options); | |
37 | #else | |
38 | return -ENODEV; | |
39 | #endif | |
40 | } | |
41 | ||
42 | static int __init | |
43 | setup_vga_console(struct pcdp_vga *vga) | |
44 | { | |
45 | #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) | |
46 | if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) { | |
47 | printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n"); | |
48 | return -ENODEV; | |
49 | } | |
50 | ||
51 | conswitchp = &vga_con; | |
52 | printk(KERN_INFO "PCDP: VGA console\n"); | |
53 | return 0; | |
54 | #else | |
55 | return -ENODEV; | |
56 | #endif | |
57 | } | |
58 | ||
59 | int __init | |
60 | efi_setup_pcdp_console(char *cmdline) | |
61 | { | |
62 | struct pcdp *pcdp; | |
63 | struct pcdp_uart *uart; | |
64 | struct pcdp_device *dev, *end; | |
65 | int i, serial = 0; | |
66 | ||
67 | pcdp = efi.hcdp; | |
68 | if (!pcdp) | |
69 | return -ENODEV; | |
70 | ||
71 | printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp)); | |
72 | ||
73 | if (strstr(cmdline, "console=hcdp")) { | |
74 | if (pcdp->rev < 3) | |
75 | serial = 1; | |
76 | } else if (strstr(cmdline, "console=")) { | |
77 | printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n"); | |
78 | return -ENODEV; | |
79 | } | |
80 | ||
81 | if (pcdp->rev < 3 && efi_uart_console_only()) | |
82 | serial = 1; | |
83 | ||
84 | for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) { | |
85 | if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) { | |
86 | if (uart->type == PCDP_CONSOLE_UART) { | |
87 | return setup_serial_console(uart); | |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length); | |
93 | for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts); | |
94 | dev < end; | |
95 | dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) { | |
96 | if (dev->flags & PCDP_PRIMARY_CONSOLE) { | |
97 | if (dev->type == PCDP_CONSOLE_VGA) { | |
98 | return setup_vga_console((struct pcdp_vga *) dev); | |
99 | } | |
100 | } | |
101 | } | |
102 | ||
103 | return -ENODEV; | |
104 | } |