aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/firmware/pcdp.c
blob: 53c95c0bbf46506826553d0e413c22cfa1c08c1e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
/*
 * Parse the EFI PCDP table to locate the console device.
 *
 * (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
 *	Khalid Aziz <khalid.aziz@hp.com>
 *	Alex Williamson <alex.williamson@hp.com>
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/config.h>
#include <linux/acpi.h>
#include <linux/console.h>
#include <linux/efi.h>
#include <linux/serial.h>
#include <asm/vga.h>
#include "pcdp.h"

static int __init
setup_serial_console(struct pcdp_uart *uart)
{
#ifdef CONFIG_SERIAL_8250_CONSOLE
	int mmio;
	static char options[64], *p = options;

	mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
	p += sprintf(p, "console=uart,%s,0x%lx",
		mmio ? "mmio" : "io", uart->addr.address);
	if (uart->baud)
		p += sprintf(p, ",%lu", uart->baud);
	if (uart->bits)
		p += sprintf(p, "n%d", uart->bits);

	return early_serial_console_init(options);
#else
	return -ENODEV;
#endif
}

static int __init
setup_vga_console(struct pcdp_device *dev)
{
#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
	u8 *if_ptr;

	if_ptr = ((u8 *)dev + sizeof(struct pcdp_device));
	if (if_ptr[0] == PCDP_IF_PCI) {
		struct pcdp_if_pci if_pci;

		/* struct copy since ifptr might not be correctly aligned */

		memcpy(&if_pci, if_ptr, sizeof(if_pci));

		if (if_pci.trans & PCDP_PCI_TRANS_IOPORT)
			vga_console_iobase = if_pci.ioport_tra;

		if (if_pci.trans & PCDP_PCI_TRANS_MMIO)
			vga_console_membase = if_pci.mmio_tra;
	}

	if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) {
		printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
		return -ENODEV;
	}

	conswitchp = &vga_con;
	printk(KERN_INFO "PCDP: VGA console\n");
	return 0;
#else
	return -ENODEV;
#endif
}

int __init
efi_setup_pcdp_console(char *cmdline)
{
	struct pcdp *pcdp;
	struct pcdp_uart *uart;
	struct pcdp_device *dev, *end;
	int i, serial = 0;

	pcdp = efi.hcdp;
	if (!pcdp)
		return -ENODEV;

	printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp));

	if (strstr(cmdline, "console=hcdp")) {
		if (pcdp->rev < 3)
			serial = 1;
	} else if (strstr(cmdline, "console=")) {
		printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
		return -ENODEV;
	}

	if (pcdp->rev < 3 && efi_uart_console_only())
		serial = 1;

	for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
		if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
			if (uart->type == PCDP_CONSOLE_UART) {
				return setup_serial_console(uart);
			}
		}
	}

	end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
	for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
	     dev < end;
	     dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
		if (dev->flags & PCDP_PRIMARY_CONSOLE) {
			if (dev->type == PCDP_CONSOLE_VGA) {
				return setup_vga_console(dev);
			}
		}
	}

	return -ENODEV;
}