blob: 2b4b76e8bd723ac25b6aa57b55cf57e23736297a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/acpi.h>
15#include <linux/console.h>
16#include <linux/efi.h>
17#include <linux/serial.h>
Mark Maule66b7f8a2005-04-25 13:51:00 -070018#include <asm/vga.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include "pcdp.h"
20
21static int __init
22setup_serial_console(struct pcdp_uart *uart)
23{
24#ifdef CONFIG_SERIAL_8250_CONSOLE
25 int mmio;
Bjorn Helgaas280dedb2005-06-23 00:10:16 -070026 static char options[64], *p = options;
Bjorn Helgaas11be00cb2005-07-28 01:07:39 -070027 char parity;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Alexey Starikovskiy15a58ed2007-02-02 19:48:22 +030029 mmio = (uart->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
Bjorn Helgaas280dedb2005-06-23 00:10:16 -070030 p += sprintf(p, "console=uart,%s,0x%lx",
31 mmio ? "mmio" : "io", uart->addr.address);
Bjorn Helgaas11be00cb2005-07-28 01:07:39 -070032 if (uart->baud) {
Bjorn Helgaas280dedb2005-06-23 00:10:16 -070033 p += sprintf(p, ",%lu", uart->baud);
Bjorn Helgaas11be00cb2005-07-28 01:07:39 -070034 if (uart->bits) {
35 switch (uart->parity) {
36 case 0x2: parity = 'e'; break;
37 case 0x3: parity = 'o'; break;
38 default: parity = 'n';
39 }
40 p += sprintf(p, "%c%d", parity, uart->bits);
41 }
42 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44 return early_serial_console_init(options);
45#else
46 return -ENODEV;
47#endif
48}
49
50static int __init
Mark Maule66b7f8a2005-04-25 13:51:00 -070051setup_vga_console(struct pcdp_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
53#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
Mark Maule66b7f8a2005-04-25 13:51:00 -070054 u8 *if_ptr;
55
56 if_ptr = ((u8 *)dev + sizeof(struct pcdp_device));
57 if (if_ptr[0] == PCDP_IF_PCI) {
58 struct pcdp_if_pci if_pci;
59
60 /* struct copy since ifptr might not be correctly aligned */
61
62 memcpy(&if_pci, if_ptr, sizeof(if_pci));
63
64 if (if_pci.trans & PCDP_PCI_TRANS_IOPORT)
65 vga_console_iobase = if_pci.ioport_tra;
66
67 if (if_pci.trans & PCDP_PCI_TRANS_MMIO)
68 vga_console_membase = if_pci.mmio_tra;
69 }
70
71 if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
73 return -ENODEV;
74 }
75
76 conswitchp = &vga_con;
77 printk(KERN_INFO "PCDP: VGA console\n");
78 return 0;
79#else
80 return -ENODEV;
81#endif
82}
83
84int __init
85efi_setup_pcdp_console(char *cmdline)
86{
87 struct pcdp *pcdp;
88 struct pcdp_uart *uart;
89 struct pcdp_device *dev, *end;
90 int i, serial = 0;
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -080091 int rc = -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -080093 if (efi.hcdp == EFI_INVALID_TABLE_ADDR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 return -ENODEV;
95
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -080096 pcdp = ioremap(efi.hcdp, 4096);
97 printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 if (strstr(cmdline, "console=hcdp")) {
100 if (pcdp->rev < 3)
101 serial = 1;
102 } else if (strstr(cmdline, "console=")) {
103 printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -0800104 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 }
106
107 if (pcdp->rev < 3 && efi_uart_console_only())
108 serial = 1;
109
110 for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
111 if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
112 if (uart->type == PCDP_CONSOLE_UART) {
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -0800113 rc = setup_serial_console(uart);
114 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
116 }
117 }
118
119 end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
120 for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
121 dev < end;
122 dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
123 if (dev->flags & PCDP_PRIMARY_CONSOLE) {
124 if (dev->type == PCDP_CONSOLE_VGA) {
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -0800125 rc = setup_vga_console(dev);
126 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
128 }
129 }
130
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -0800131out:
132 iounmap(pcdp);
133 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}