2 * linux/arch/arm/plat-omap/common.c
4 * Code common to all OMAP machines.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/config.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
16 #include <linux/console.h>
17 #include <linux/serial.h>
18 #include <linux/tty.h>
19 #include <linux/serial_8250.h>
20 #include <linux/serial_reg.h>
22 #include <asm/hardware.h>
23 #include <asm/system.h>
24 #include <asm/pgtable.h>
25 #include <asm/mach/map.h>
26 #include <asm/hardware/clock.h>
28 #include <asm/mach-types.h>
29 #include <asm/setup.h>
31 #include <asm/arch/board.h>
32 #include <asm/arch/mux.h>
33 #include <asm/arch/fpga.h>
37 #define NO_LENGTH_CHECK 0xffffffff
39 unsigned char omap_bootloader_tag[512];
40 int omap_bootloader_tag_len;
42 struct omap_board_config_kernel *omap_board_config;
43 int omap_board_config_size;
45 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
47 struct omap_board_config_kernel *kinfo = NULL;
50 #ifdef CONFIG_OMAP_BOOT_TAG
51 struct omap_board_config_entry *info = NULL;
53 if (omap_bootloader_tag_len > 4)
54 info = (struct omap_board_config_entry *) omap_bootloader_tag;
55 while (info != NULL) {
58 if (info->tag == tag) {
64 if ((info->len & 0x03) != 0) {
65 /* We bail out to avoid an alignment fault */
66 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
67 info->len, info->tag);
70 next = (u8 *) info + sizeof(*info) + info->len;
71 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
74 info = (struct omap_board_config_entry *) next;
77 /* Check the length as a lame attempt to check for
78 * binary inconsistancy. */
79 if (len != NO_LENGTH_CHECK) {
82 len = (len + 3) & ~0x03;
83 if (info->len != len) {
84 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
94 /* Try to find the config from the board-specific structures
96 for (i = 0; i < omap_board_config_size; i++) {
97 if (omap_board_config[i].tag == tag) {
98 kinfo = &omap_board_config[i];
107 const void *__omap_get_config(u16 tag, size_t len, int nr)
109 return get_config(tag, len, nr, NULL);
111 EXPORT_SYMBOL(__omap_get_config);
113 const void *omap_get_var_config(u16 tag, size_t *len)
115 return get_config(tag, NO_LENGTH_CHECK, 0, len);
117 EXPORT_SYMBOL(omap_get_var_config);
119 static int __init omap_add_serial_console(void)
121 const struct omap_serial_console_config *info;
123 info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
124 struct omap_serial_console_config);
125 if (info != NULL && info->console_uart) {
126 static char speed[11], *opt = NULL;
128 if (info->console_speed) {
129 snprintf(speed, sizeof(speed), "%u", info->console_speed);
132 return add_preferred_console("ttyS", info->console_uart - 1, opt);
136 console_initcall(omap_add_serial_console);