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 <linux/serial_8250.h>
19 #include <asm/vga.h>
20 #include "pcdp.h"
21
22 static int __init
23 setup_serial_console(struct pcdp_uart *uart)
24 {
25 #ifdef CONFIG_SERIAL_8250_CONSOLE
26 int mmio;
27 static char options[64], *p = options;
28 char parity;
29
30 mmio = (uart->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
31 p += sprintf(p, "uart8250,%s,0x%lx",
32 mmio ? "mmio" : "io", uart->addr.address);
33 if (uart->baud) {
34 p += sprintf(p, ",%lu", uart->baud);
35 if (uart->bits) {
36 switch (uart->parity) {
37 case 0x2: parity = 'e'; break;
38 case 0x3: parity = 'o'; break;
39 default: parity = 'n';
40 }
41 p += sprintf(p, "%c%d", parity, uart->bits);
42 }
43 }
44
45 add_preferred_console("uart", 8250, &options[9]);
46 return setup_early_serial8250_console(options);
47 #else
48 return -ENODEV;
49 #endif
50 }
51
52 static int __init
53 setup_vga_console(struct pcdp_device *dev)
54 {
55 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
56 u8 *if_ptr;
57
58 if_ptr = ((u8 *)dev + sizeof(struct pcdp_device));
59 if (if_ptr[0] == PCDP_IF_PCI) {
60 struct pcdp_if_pci if_pci;
61
62 /* struct copy since ifptr might not be correctly aligned */
63
64 memcpy(&if_pci, if_ptr, sizeof(if_pci));
65
66 if (if_pci.trans & PCDP_PCI_TRANS_IOPORT)
67 vga_console_iobase = if_pci.ioport_tra;
68
69 if (if_pci.trans & PCDP_PCI_TRANS_MMIO)
70 vga_console_membase = if_pci.mmio_tra;
71 }
72
73 if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) {
74 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
75 return -ENODEV;
76 }
77
78 conswitchp = &vga_con;
79 printk(KERN_INFO "PCDP: VGA console\n");
80 return 0;
81 #else
82 return -ENODEV;
83 #endif
84 }
85
86 int __init
87 efi_setup_pcdp_console(char *cmdline)
88 {
89 struct pcdp *pcdp;
90 struct pcdp_uart *uart;
91 struct pcdp_device *dev, *end;
92 int i, serial = 0;
93 int rc = -ENODEV;
94
95 if (efi.hcdp == EFI_INVALID_TABLE_ADDR)
96 return -ENODEV;
97
98 pcdp = ioremap(efi.hcdp, 4096);
99 printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp);
100
101 if (strstr(cmdline, "console=hcdp")) {
102 if (pcdp->rev < 3)
103 serial = 1;
104 } else if (strstr(cmdline, "console=")) {
105 printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
106 goto out;
107 }
108
109 if (pcdp->rev < 3 && efi_uart_console_only())
110 serial = 1;
111
112 for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
113 if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
114 if (uart->type == PCDP_CONSOLE_UART) {
115 rc = setup_serial_console(uart);
116 goto out;
117 }
118 }
119 }
120
121 end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
122 for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
123 dev < end;
124 dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
125 if (dev->flags & PCDP_PRIMARY_CONSOLE) {
126 if (dev->type == PCDP_CONSOLE_VGA) {
127 rc = setup_vga_console(dev);
128 goto out;
129 }
130 }
131 }
132
133 out:
134 iounmap(pcdp);
135 return rc;
136 }
137
|
This page was automatically generated by the
LXR engine.
|