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>
21 #include <linux/clk.h>
23 #include <asm/hardware.h>
24 #include <asm/system.h>
25 #include <asm/pgtable.h>
26 #include <asm/mach/map.h>
28 #include <asm/setup.h>
30 #include <asm/arch/board.h>
31 #include <asm/arch/mux.h>
32 #include <asm/arch/fpga.h>
34 #include <asm/arch/clock.h>
36 #define NO_LENGTH_CHECK 0xffffffff
38 unsigned char omap_bootloader_tag[512];
39 int omap_bootloader_tag_len;
41 struct omap_board_config_kernel *omap_board_config;
42 int omap_board_config_size;
44 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
46 struct omap_board_config_kernel *kinfo = NULL;
49 #ifdef CONFIG_OMAP_BOOT_TAG
50 struct omap_board_config_entry *info = NULL;
52 if (omap_bootloader_tag_len > 4)
53 info = (struct omap_board_config_entry *) omap_bootloader_tag;
54 while (info != NULL) {
57 if (info->tag == tag) {
63 if ((info->len & 0x03) != 0) {
64 /* We bail out to avoid an alignment fault */
65 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
66 info->len, info->tag);
69 next = (u8 *) info + sizeof(*info) + info->len;
70 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
73 info = (struct omap_board_config_entry *) next;
76 /* Check the length as a lame attempt to check for
77 * binary inconsistancy. */
78 if (len != NO_LENGTH_CHECK) {
81 len = (len + 3) & ~0x03;
82 if (info->len != len) {
83 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
93 /* Try to find the config from the board-specific structures
95 for (i = 0; i < omap_board_config_size; i++) {
96 if (omap_board_config[i].tag == tag) {
97 kinfo = &omap_board_config[i];
106 const void *__omap_get_config(u16 tag, size_t len, int nr)
108 return get_config(tag, len, nr, NULL);
110 EXPORT_SYMBOL(__omap_get_config);
112 const void *omap_get_var_config(u16 tag, size_t *len)
114 return get_config(tag, NO_LENGTH_CHECK, 0, len);
116 EXPORT_SYMBOL(omap_get_var_config);
118 static int __init omap_add_serial_console(void)
120 const struct omap_serial_console_config *con_info;
121 const struct omap_uart_config *uart_info;
122 static char speed[11], *opt = NULL;
123 int line, i, uart_idx;
125 uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
126 con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
127 struct omap_serial_console_config);
128 if (uart_info == NULL || con_info == NULL)
131 if (con_info->console_uart == 0)
134 if (con_info->console_speed) {
135 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
139 uart_idx = con_info->console_uart - 1;
140 if (uart_idx >= OMAP_MAX_NR_PORTS) {
141 printk(KERN_INFO "Console: external UART#%d. "
142 "Not adding it as console this time.\n",
146 if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
147 printk(KERN_ERR "Console: Selected UART#%d is "
148 "not enabled for this platform\n",
153 for (i = 0; i < uart_idx; i++) {
154 if (uart_info->enabled_uarts & (1 << i))
157 return add_preferred_console("ttyS", line, opt);
159 console_initcall(omap_add_serial_console);