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/module.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
15 #include <linux/console.h>
16 #include <linux/serial.h>
17 #include <linux/tty.h>
18 #include <linux/serial_8250.h>
19 #include <linux/serial_reg.h>
20 #include <linux/clk.h>
22 #include <asm/hardware.h>
23 #include <asm/system.h>
24 #include <asm/pgtable.h>
25 #include <asm/mach/map.h>
27 #include <asm/setup.h>
29 #include <asm/arch/board.h>
30 #include <asm/arch/mux.h>
31 #include <asm/arch/fpga.h>
33 #include <asm/arch/clock.h>
35 #define NO_LENGTH_CHECK 0xffffffff
37 unsigned char omap_bootloader_tag[512];
38 int omap_bootloader_tag_len;
40 struct omap_board_config_kernel *omap_board_config;
41 int omap_board_config_size;
43 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
45 struct omap_board_config_kernel *kinfo = NULL;
48 #ifdef CONFIG_OMAP_BOOT_TAG
49 struct omap_board_config_entry *info = NULL;
51 if (omap_bootloader_tag_len > 4)
52 info = (struct omap_board_config_entry *) omap_bootloader_tag;
53 while (info != NULL) {
56 if (info->tag == tag) {
62 if ((info->len & 0x03) != 0) {
63 /* We bail out to avoid an alignment fault */
64 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
65 info->len, info->tag);
68 next = (u8 *) info + sizeof(*info) + info->len;
69 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
72 info = (struct omap_board_config_entry *) next;
75 /* Check the length as a lame attempt to check for
76 * binary inconsistancy. */
77 if (len != NO_LENGTH_CHECK) {
80 len = (len + 3) & ~0x03;
81 if (info->len != len) {
82 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
92 /* Try to find the config from the board-specific structures
94 for (i = 0; i < omap_board_config_size; i++) {
95 if (omap_board_config[i].tag == tag) {
96 kinfo = &omap_board_config[i];
105 const void *__omap_get_config(u16 tag, size_t len, int nr)
107 return get_config(tag, len, nr, NULL);
109 EXPORT_SYMBOL(__omap_get_config);
111 const void *omap_get_var_config(u16 tag, size_t *len)
113 return get_config(tag, NO_LENGTH_CHECK, 0, len);
115 EXPORT_SYMBOL(omap_get_var_config);
117 static int __init omap_add_serial_console(void)
119 const struct omap_serial_console_config *con_info;
120 const struct omap_uart_config *uart_info;
121 static char speed[11], *opt = NULL;
122 int line, i, uart_idx;
124 uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
125 con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
126 struct omap_serial_console_config);
127 if (uart_info == NULL || con_info == NULL)
130 if (con_info->console_uart == 0)
133 if (con_info->console_speed) {
134 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
138 uart_idx = con_info->console_uart - 1;
139 if (uart_idx >= OMAP_MAX_NR_PORTS) {
140 printk(KERN_INFO "Console: external UART#%d. "
141 "Not adding it as console this time.\n",
145 if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
146 printk(KERN_ERR "Console: Selected UART#%d is "
147 "not enabled for this platform\n",
152 for (i = 0; i < uart_idx; i++) {
153 if (uart_info->enabled_uarts & (1 << i))
156 return add_preferred_console("ttyS", line, opt);
158 console_initcall(omap_add_serial_console);