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>
23 #include <mach/hardware.h>
24 #include <asm/system.h>
25 #include <asm/pgtable.h>
26 #include <asm/mach/map.h>
27 #include <asm/setup.h>
29 #include <mach/common.h>
30 #include <mach/board.h>
31 #include <mach/control.h>
33 #include <mach/fpga.h>
35 #include <mach/clock.h>
37 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
38 # include "../mach-omap2/sdrc.h"
41 #define NO_LENGTH_CHECK 0xffffffff
43 unsigned char omap_bootloader_tag[512];
44 int omap_bootloader_tag_len;
46 struct omap_board_config_kernel *omap_board_config;
47 int omap_board_config_size;
49 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
51 struct omap_board_config_kernel *kinfo = NULL;
54 #ifdef CONFIG_OMAP_BOOT_TAG
55 struct omap_board_config_entry *info = NULL;
57 if (omap_bootloader_tag_len > 4)
58 info = (struct omap_board_config_entry *) omap_bootloader_tag;
59 while (info != NULL) {
62 if (info->tag == tag) {
68 if ((info->len & 0x03) != 0) {
69 /* We bail out to avoid an alignment fault */
70 printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
71 info->len, info->tag);
74 next = (u8 *) info + sizeof(*info) + info->len;
75 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
78 info = (struct omap_board_config_entry *) next;
81 /* Check the length as a lame attempt to check for
82 * binary inconsistency. */
83 if (len != NO_LENGTH_CHECK) {
86 len = (len + 3) & ~0x03;
87 if (info->len != len) {
88 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
98 /* Try to find the config from the board-specific structures
100 for (i = 0; i < omap_board_config_size; i++) {
101 if (omap_board_config[i].tag == tag) {
103 kinfo = &omap_board_config[i];
115 const void *__omap_get_config(u16 tag, size_t len, int nr)
117 return get_config(tag, len, nr, NULL);
119 EXPORT_SYMBOL(__omap_get_config);
121 const void *omap_get_var_config(u16 tag, size_t *len)
123 return get_config(tag, NO_LENGTH_CHECK, 0, len);
125 EXPORT_SYMBOL(omap_get_var_config);
127 static int __init omap_add_serial_console(void)
129 const struct omap_serial_console_config *con_info;
130 const struct omap_uart_config *uart_info;
131 static char speed[11], *opt = NULL;
132 int line, i, uart_idx;
134 uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
135 con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
136 struct omap_serial_console_config);
137 if (uart_info == NULL || con_info == NULL)
140 if (con_info->console_uart == 0)
143 if (con_info->console_speed) {
144 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
148 uart_idx = con_info->console_uart - 1;
149 if (uart_idx >= OMAP_MAX_NR_PORTS) {
150 printk(KERN_INFO "Console: external UART#%d. "
151 "Not adding it as console this time.\n",
155 if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
156 printk(KERN_ERR "Console: Selected UART#%d is "
157 "not enabled for this platform\n",
162 for (i = 0; i < uart_idx; i++) {
163 if (uart_info->enabled_uarts & (1 << i))
166 return add_preferred_console("ttyS", line, opt);
168 console_initcall(omap_add_serial_console);
172 * 32KHz clocksource ... always available, on pretty most chips except
173 * OMAP 730 and 1510. Other timers could be used as clocksources, with
174 * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
175 * but systems won't necessarily want to spend resources that way.
178 #if defined(CONFIG_ARCH_OMAP16XX)
179 #define TIMER_32K_SYNCHRONIZED 0xfffbc410
180 #elif defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
181 #define TIMER_32K_SYNCHRONIZED (OMAP2_32KSYNCT_BASE + 0x10)
184 #ifdef TIMER_32K_SYNCHRONIZED
186 #include <linux/clocksource.h>
188 static cycle_t omap_32k_read(void)
190 return omap_readl(TIMER_32K_SYNCHRONIZED);
193 static struct clocksource clocksource_32k = {
194 .name = "32k_counter",
196 .read = omap_32k_read,
197 .mask = CLOCKSOURCE_MASK(32),
199 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
203 * Rounds down to nearest nsec.
205 unsigned long long omap_32k_ticks_to_nsecs(unsigned long ticks_32k)
207 return cyc2ns(&clocksource_32k, ticks_32k);
211 * Returns current time from boot in nsecs. It's OK for this to wrap
212 * around for now, as it's just a relative time stamp.
214 unsigned long long sched_clock(void)
216 return omap_32k_ticks_to_nsecs(omap_32k_read());
219 static int __init omap_init_clocksource_32k(void)
221 static char err[] __initdata = KERN_ERR
222 "%s: can't register clocksource!\n";
224 if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
225 struct clk *sync_32k_ick;
227 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
229 clk_enable(sync_32k_ick);
231 clocksource_32k.mult = clocksource_hz2mult(32768,
232 clocksource_32k.shift);
234 if (clocksource_register(&clocksource_32k))
235 printk(err, clocksource_32k.name);
239 arch_initcall(omap_init_clocksource_32k);
241 #endif /* TIMER_32K_SYNCHRONIZED */
243 /* Global address base setup code */
245 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
247 static struct omap_globals *omap2_globals;
249 static void __init __omap2_set_globals(void)
251 omap2_set_globals_tap(omap2_globals);
252 omap2_set_globals_memory(omap2_globals);
253 omap2_set_globals_control(omap2_globals);
254 omap2_set_globals_prcm(omap2_globals);
259 #if defined(CONFIG_ARCH_OMAP2420)
261 static struct omap_globals omap242x_globals = {
262 .class = OMAP242X_CLASS,
263 .tap = OMAP2_IO_ADDRESS(0x48014000),
264 .sdrc = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
265 .sms = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
266 .ctrl = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
267 .prm = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
268 .cm = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
271 void __init omap2_set_globals_242x(void)
273 omap2_globals = &omap242x_globals;
274 __omap2_set_globals();
278 #if defined(CONFIG_ARCH_OMAP2430)
280 static struct omap_globals omap243x_globals = {
281 .class = OMAP243X_CLASS,
282 .tap = OMAP2_IO_ADDRESS(0x4900a000),
283 .sdrc = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
284 .sms = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
285 .ctrl = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
286 .prm = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
287 .cm = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
290 void __init omap2_set_globals_243x(void)
292 omap2_globals = &omap243x_globals;
293 __omap2_set_globals();
297 #if defined(CONFIG_ARCH_OMAP3430)
299 static struct omap_globals omap343x_globals = {
300 .class = OMAP343X_CLASS,
301 .tap = OMAP2_IO_ADDRESS(0x4830A000),
302 .sdrc = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
303 .sms = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
304 .ctrl = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
305 .prm = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
306 .cm = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
309 void __init omap2_set_globals_343x(void)
311 omap2_globals = &omap343x_globals;
312 __omap2_set_globals();