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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%llx", |
32 | mmio ? "mmio" : "io", uart->addr.address); |
33 | if (uart->baud) { |
34 | p += sprintf(p, ",%llu", 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 = early_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 | early_iounmap(pcdp, 4096); |
135 | return rc; |
136 | } |
137 |
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