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 #ifdef CONFIG_OMAP_BOOT_TAG
45 static int __init parse_tag_omap(const struct tag *tag)
47 u32 size = tag->hdr.size - (sizeof(tag->hdr) >> 2);
50 if (size > sizeof(omap_bootloader_tag))
53 memcpy(omap_bootloader_tag, tag->u.omap.data, size);
54 omap_bootloader_tag_len = size;
59 __tagtable(ATAG_BOARD, parse_tag_omap);
63 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
65 struct omap_board_config_kernel *kinfo = NULL;
68 #ifdef CONFIG_OMAP_BOOT_TAG
69 struct omap_board_config_entry *info = NULL;
71 if (omap_bootloader_tag_len > 4)
72 info = (struct omap_board_config_entry *) omap_bootloader_tag;
73 while (info != NULL) {
76 if (info->tag == tag) {
82 if ((info->len & 0x03) != 0) {
83 /* We bail out to avoid an alignment fault */
84 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
85 info->len, info->tag);
88 next = (u8 *) info + sizeof(*info) + info->len;
89 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
92 info = (struct omap_board_config_entry *) next;
95 /* Check the length as a lame attempt to check for
96 * binary inconsistancy. */
97 if (len != NO_LENGTH_CHECK) {
100 len = (len + 3) & ~0x03;
101 if (info->len != len) {
102 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
103 tag, len, info->len);
108 *len_out = info->len;
112 /* Try to find the config from the board-specific structures
114 for (i = 0; i < omap_board_config_size; i++) {
115 if (omap_board_config[i].tag == tag) {
117 kinfo = &omap_board_config[i];
129 const void *__omap_get_config(u16 tag, size_t len, int nr)
131 return get_config(tag, len, nr, NULL);
133 EXPORT_SYMBOL(__omap_get_config);
135 const void *omap_get_var_config(u16 tag, size_t *len)
137 return get_config(tag, NO_LENGTH_CHECK, 0, len);
139 EXPORT_SYMBOL(omap_get_var_config);
141 static int __init omap_add_serial_console(void)
143 const struct omap_serial_console_config *con_info;
144 const struct omap_uart_config *uart_info;
145 static char speed[11], *opt = NULL;
146 int line, i, uart_idx;
148 uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
149 con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
150 struct omap_serial_console_config);
151 if (uart_info == NULL || con_info == NULL)
154 if (con_info->console_uart == 0)
157 if (con_info->console_speed) {
158 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
162 uart_idx = con_info->console_uart - 1;
163 if (uart_idx >= OMAP_MAX_NR_PORTS) {
164 printk(KERN_INFO "Console: external UART#%d. "
165 "Not adding it as console this time.\n",
169 if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
170 printk(KERN_ERR "Console: Selected UART#%d is "
171 "not enabled for this platform\n",
176 for (i = 0; i < uart_idx; i++) {
177 if (uart_info->enabled_uarts & (1 << i))
180 return add_preferred_console("ttyS", line, opt);
182 console_initcall(omap_add_serial_console);
186 * 32KHz clocksource ... always available, on pretty most chips except
187 * OMAP 730 and 1510. Other timers could be used as clocksources, with
188 * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
189 * but systems won't necessarily want to spend resources that way.
192 #if defined(CONFIG_ARCH_OMAP16XX)
193 #define TIMER_32K_SYNCHRONIZED 0xfffbc410
194 #elif defined(CONFIG_ARCH_OMAP2420)
195 #define TIMER_32K_SYNCHRONIZED 0x48004010
196 #elif defined(CONFIG_ARCH_OMAP2430)
197 #define TIMER_32K_SYNCHRONIZED 0x49020010
200 #ifdef TIMER_32K_SYNCHRONIZED
202 #include <linux/clocksource.h>
204 static cycle_t omap_32k_read(void)
206 return omap_readl(TIMER_32K_SYNCHRONIZED);
209 static struct clocksource clocksource_32k = {
210 .name = "32k_counter",
212 .read = omap_32k_read,
213 .mask = CLOCKSOURCE_MASK(32),
215 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
218 static int __init omap_init_clocksource_32k(void)
220 static char err[] __initdata = KERN_ERR
221 "%s: can't register clocksource!\n";
223 if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
224 clocksource_32k.mult = clocksource_hz2mult(32768,
225 clocksource_32k.shift);
227 if (clocksource_register(&clocksource_32k))
228 printk(err, clocksource_32k.name);
232 arch_initcall(omap_init_clocksource_32k);
234 #endif /* TIMER_32K_SYNCHRONIZED */