2 * linux/arch/arm/mach-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>
30 #include <asm/arch/board.h>
31 #include <asm/arch/mux.h>
32 #include <asm/arch/fpga.h>
36 #define NO_LENGTH_CHECK 0xffffffff
38 unsigned char omap_bootloader_tag[512];
39 int omap_bootloader_tag_len = 0;
41 struct omap_board_config_kernel *omap_board_config;
42 int omap_board_config_size = 0;
44 #ifdef CONFIG_OMAP_BOOT_TAG
46 static int __init parse_tag_omap(const struct tag *tag)
48 u32 size = tag->hdr.size - (sizeof(tag->hdr) >> 2);
51 if (size > sizeof(omap_bootloader_tag))
54 memcpy(omap_bootloader_tag, tag->u.omap.data, size);
55 omap_bootloader_tag_len = size;
60 __tagtable(ATAG_BOARD, parse_tag_omap);
64 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
66 struct omap_board_config_kernel *kinfo = NULL;
69 #ifdef CONFIG_OMAP_BOOT_TAG
70 struct omap_board_config_entry *info = NULL;
72 if (omap_bootloader_tag_len > 4)
73 info = (struct omap_board_config_entry *) omap_bootloader_tag;
74 while (info != NULL) {
77 if (info->tag == tag) {
83 if ((info->len & 0x03) != 0) {
84 /* We bail out to avoid an alignment fault */
85 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
86 info->len, info->tag);
89 next = (u8 *) info + sizeof(*info) + info->len;
90 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
93 info = (struct omap_board_config_entry *) next;
96 /* Check the length as a lame attempt to check for
97 * binary inconsistancy. */
98 if (len != NO_LENGTH_CHECK) {
101 len = (len + 3) & ~0x03;
102 if (info->len != len) {
103 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
104 tag, len, info->len);
109 *len_out = info->len;
113 /* Try to find the config from the board-specific structures
115 for (i = 0; i < omap_board_config_size; i++) {
116 if (omap_board_config[i].tag == tag) {
117 kinfo = &omap_board_config[i];
126 const void *__omap_get_config(u16 tag, size_t len, int nr)
128 return get_config(tag, len, nr, NULL);
130 EXPORT_SYMBOL(__omap_get_config);
132 const void *omap_get_var_config(u16 tag, size_t *len)
134 return get_config(tag, NO_LENGTH_CHECK, 0, len);
136 EXPORT_SYMBOL(omap_get_var_config);
138 static int __init omap_add_serial_console(void)
140 const struct omap_serial_console_config *info;
142 info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
143 struct omap_serial_console_config);
144 if (info != NULL && info->console_uart) {
145 static char speed[11], *opt = NULL;
147 if (info->console_speed) {
148 snprintf(speed, sizeof(speed), "%u", info->console_speed);
151 return add_preferred_console("ttyS", info->console_uart - 1, opt);
155 console_initcall(omap_add_serial_console);