Merge branches 'release' and 'wmi-2.6.25' into release
[linux-2.6] / drivers / firmware / pcdp.c
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 }