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 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
36 # include "../mach-omap2/sdrc.h"
39 #define NO_LENGTH_CHECK 0xffffffff
41 u32 omap2_ctrl_base; /* until we have a better place to put it */
43 unsigned char omap_bootloader_tag[1024];
44 int omap_bootloader_tag_len;
46 struct omap_board_config_kernel *omap_board_config;
47 int omap_board_config_size;
49 #ifdef CONFIG_OMAP_BOOT_TAG
51 static int __init parse_tag_omap(const struct tag *tag)
53 u32 size = tag->hdr.size - (sizeof(tag->hdr) >> 2);
56 if (size > sizeof(omap_bootloader_tag))
59 memcpy(omap_bootloader_tag, tag->u.omap.data, size);
60 omap_bootloader_tag_len = size;
65 __tagtable(ATAG_BOARD, parse_tag_omap);
69 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
71 struct omap_board_config_kernel *kinfo = NULL;
74 #ifdef CONFIG_OMAP_BOOT_TAG
75 struct omap_board_config_entry *info = NULL;
77 if (omap_bootloader_tag_len > 4)
78 info = (struct omap_board_config_entry *) omap_bootloader_tag;
79 while (info != NULL) {
82 if (info->tag == tag) {
88 if ((info->len & 0x03) != 0) {
89 /* We bail out to avoid an alignment fault */
90 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
91 info->len, info->tag);
94 next = (u8 *) info + sizeof(*info) + info->len;
95 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
98 info = (struct omap_board_config_entry *) next;
101 /* Check the length as a lame attempt to check for
102 * binary inconsistency. */
103 if (len != NO_LENGTH_CHECK) {
106 len = (len + 3) & ~0x03;
107 if (info->len != len) {
108 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
109 tag, len, info->len);
114 *len_out = info->len;
118 /* Try to find the config from the board-specific structures
120 for (i = 0; i < omap_board_config_size; i++) {
121 if (omap_board_config[i].tag == tag) {
123 kinfo = &omap_board_config[i];
135 const void *__omap_get_config(u16 tag, size_t len, int nr)
137 return get_config(tag, len, nr, NULL);
139 EXPORT_SYMBOL(__omap_get_config);
141 const void *omap_get_var_config(u16 tag, size_t *len)
143 return get_config(tag, NO_LENGTH_CHECK, 0, len);
145 EXPORT_SYMBOL(omap_get_var_config);
147 static int __init omap_add_serial_console(void)
149 const struct omap_serial_console_config *con_info;
150 const struct omap_uart_config *uart_info;
151 static char speed[11], *opt = NULL;
152 int line, i, uart_idx;
154 uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
155 con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
156 struct omap_serial_console_config);
157 if (uart_info == NULL || con_info == NULL)
160 if (con_info->console_uart == 0)
163 if (con_info->console_speed) {
164 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
168 uart_idx = con_info->console_uart - 1;
169 if (uart_idx >= OMAP_MAX_NR_PORTS) {
170 printk(KERN_INFO "Console: external UART#%d. "
171 "Not adding it as console this time.\n",
175 if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
176 printk(KERN_ERR "Console: Selected UART#%d is "
177 "not enabled for this platform\n",
182 for (i = 0; i < uart_idx; i++) {
183 if (uart_info->enabled_uarts & (1 << i))
186 return add_preferred_console("ttyS", line, opt);
188 console_initcall(omap_add_serial_console);
192 * 32KHz clocksource ... always available, on pretty most chips except
193 * OMAP 730 and 1510. Other timers could be used as clocksources, with
194 * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
195 * but systems won't necessarily want to spend resources that way.
198 #if defined(CONFIG_ARCH_OMAP16XX)
199 #define TIMER_32K_SYNCHRONIZED 0xfffbc410
200 #elif defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
201 #define TIMER_32K_SYNCHRONIZED (OMAP2_32KSYNCT_BASE + 0x10)
204 #ifdef TIMER_32K_SYNCHRONIZED
206 #include <linux/clocksource.h>
208 static cycle_t omap_32k_read(void)
210 return omap_readl(TIMER_32K_SYNCHRONIZED);
213 static struct clocksource clocksource_32k = {
214 .name = "32k_counter",
216 .read = omap_32k_read,
217 .mask = CLOCKSOURCE_MASK(32),
219 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
223 * Rounds down to nearest nsec.
225 unsigned long long omap_32k_ticks_to_nsecs(unsigned long ticks_32k)
227 return cyc2ns(&clocksource_32k, ticks_32k);
231 * Returns current time from boot in nsecs. It's OK for this to wrap
232 * around for now, as it's just a relative time stamp.
234 unsigned long long sched_clock(void)
236 return omap_32k_ticks_to_nsecs(omap_32k_read());
239 static int __init omap_init_clocksource_32k(void)
241 static char err[] __initdata = KERN_ERR
242 "%s: can't register clocksource!\n";
244 if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
245 struct clk *sync_32k_ick;
247 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
249 clk_enable(sync_32k_ick);
251 clocksource_32k.mult = clocksource_hz2mult(32768,
252 clocksource_32k.shift);
254 if (clocksource_register(&clocksource_32k))
255 printk(err, clocksource_32k.name);
259 arch_initcall(omap_init_clocksource_32k);
261 #endif /* TIMER_32K_SYNCHRONIZED */
263 /* Global address base setup code */
265 #if defined(CONFIG_ARCH_OMAP2420)
266 void __init omap2_set_globals_242x(void)
268 omap2_sdrc_base = OMAP2420_SDRC_BASE;
269 omap2_sms_base = OMAP2420_SMS_BASE;
270 omap2_ctrl_base = OMAP2420_CTRL_BASE;
274 #if defined(CONFIG_ARCH_OMAP2430)
275 void __init omap2_set_globals_243x(void)
277 omap2_sdrc_base = OMAP243X_SDRC_BASE;
278 omap2_sms_base = OMAP243X_SMS_BASE;
279 omap2_ctrl_base = OMAP243X_CTRL_BASE;
283 #if defined(CONFIG_ARCH_OMAP3430)
284 void __init omap2_set_globals_343x(void)
286 omap2_sdrc_base = OMAP343X_SDRC_BASE;
287 omap2_sms_base = OMAP343X_SMS_BASE;
288 omap2_ctrl_base = OMAP343X_CTRL_BASE;