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[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 * Returns current time from boot in nsecs. It's OK for this to wrap
224 * around for now, as it's just a relative time stamp.
226 unsigned long long sched_clock(void)
228 unsigned long long ret;
230 ret = (unsigned long long)omap_32k_read();
231 ret = (ret * clocksource_32k.mult_orig) >> clocksource_32k.shift;
235 static int __init omap_init_clocksource_32k(void)
237 static char err[] __initdata = KERN_ERR
238 "%s: can't register clocksource!\n";
240 if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
241 struct clk *sync_32k_ick;
243 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
245 clk_enable(sync_32k_ick);
247 clocksource_32k.mult = clocksource_hz2mult(32768,
248 clocksource_32k.shift);
250 if (clocksource_register(&clocksource_32k))
251 printk(err, clocksource_32k.name);
255 arch_initcall(omap_init_clocksource_32k);
257 #endif /* TIMER_32K_SYNCHRONIZED */
259 /* Global address base setup code */
261 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
263 static struct omap_globals *omap2_globals;
265 static void __init __omap2_set_globals(void)
267 omap2_set_globals_tap(omap2_globals);
268 omap2_set_globals_sdrc(omap2_globals);
269 omap2_set_globals_control(omap2_globals);
270 omap2_set_globals_prcm(omap2_globals);
275 #if defined(CONFIG_ARCH_OMAP2420)
277 static struct omap_globals omap242x_globals = {
278 .class = OMAP242X_CLASS,
279 .tap = OMAP2_IO_ADDRESS(0x48014000),
280 .sdrc = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
281 .sms = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
282 .ctrl = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
283 .prm = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
284 .cm = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
287 void __init omap2_set_globals_242x(void)
289 omap2_globals = &omap242x_globals;
290 __omap2_set_globals();
294 #if defined(CONFIG_ARCH_OMAP2430)
296 static struct omap_globals omap243x_globals = {
297 .class = OMAP243X_CLASS,
298 .tap = OMAP2_IO_ADDRESS(0x4900a000),
299 .sdrc = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
300 .sms = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
301 .ctrl = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
302 .prm = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
303 .cm = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
306 void __init omap2_set_globals_243x(void)
308 omap2_globals = &omap243x_globals;
309 __omap2_set_globals();
313 #if defined(CONFIG_ARCH_OMAP3430)
315 static struct omap_globals omap343x_globals = {
316 .class = OMAP343X_CLASS,
317 .tap = OMAP2_IO_ADDRESS(0x4830A000),
318 .sdrc = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
319 .sms = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
320 .ctrl = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
321 .prm = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
322 .cm = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
325 void __init omap2_set_globals_343x(void)
327 omap2_globals = &omap343x_globals;
328 __omap2_set_globals();