[deliverable/linux.git] / arch / arm / plat-omap / common.c

/*
 * linux/arch/arm/plat-omap/common.c
 *
 * Code common to all OMAP machines.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/console.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>

#include <asm/hardware.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
#include <asm/io.h>
#include <asm/setup.h>

#include <asm/arch/board.h>
#include <asm/arch/mux.h>
#include <asm/arch/fpga.h>

#include <asm/arch/clock.h>

#define NO_LENGTH_CHECK 0xffffffff

unsigned char omap_bootloader_tag[512];
int omap_bootloader_tag_len;

struct omap_board_config_kernel *omap_board_config;
int omap_board_config_size;

static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
{
	struct omap_board_config_kernel *kinfo = NULL;
	int i;

#ifdef CONFIG_OMAP_BOOT_TAG
	struct omap_board_config_entry *info = NULL;

	if (omap_bootloader_tag_len > 4)
		info = (struct omap_board_config_entry *) omap_bootloader_tag;
	while (info != NULL) {
		u8 *next;

		if (info->tag == tag) {
			if (skip == 0)
				break;
			skip--;
		}

		if ((info->len & 0x03) != 0) {
			/* We bail out to avoid an alignment fault */
			printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
			       info->len, info->tag);
			return NULL;
		}
		next = (u8 *) info + sizeof(*info) + info->len;
		if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
			info = NULL;
		else
			info = (struct omap_board_config_entry *) next;
	}
	if (info != NULL) {
		/* Check the length as a lame attempt to check for
		 * binary inconsistency. */
		if (len != NO_LENGTH_CHECK) {
			/* Word-align len */
			if (len & 0x03)
				len = (len + 3) & ~0x03;
			if (info->len != len) {
				printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
				       tag, len, info->len);
				return NULL;
			}
		}
		if (len_out != NULL)
			*len_out = info->len;
		return info->data;
	}
#endif
	/* Try to find the config from the board-specific structures
	 * in the kernel. */
	for (i = 0; i < omap_board_config_size; i++) {
		if (omap_board_config[i].tag == tag) {
			if (skip == 0) {
				kinfo = &omap_board_config[i];
				break;
			} else {
				skip--;
			}
		}
	}
	if (kinfo == NULL)
		return NULL;
	return kinfo->data;
}

const void *__omap_get_config(u16 tag, size_t len, int nr)
{
        return get_config(tag, len, nr, NULL);
}
EXPORT_SYMBOL(__omap_get_config);

const void *omap_get_var_config(u16 tag, size_t *len)
{
        return get_config(tag, NO_LENGTH_CHECK, 0, len);
}
EXPORT_SYMBOL(omap_get_var_config);

static int __init omap_add_serial_console(void)
{
	const struct omap_serial_console_config *con_info;
	const struct omap_uart_config *uart_info;
	static char speed[11], *opt = NULL;
	int line, i, uart_idx;

	uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
	con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
					struct omap_serial_console_config);
	if (uart_info == NULL || con_info == NULL)
		return 0;

	if (con_info->console_uart == 0)
		return 0;

	if (con_info->console_speed) {
		snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
		opt = speed;
	}

	uart_idx = con_info->console_uart - 1;
	if (uart_idx >= OMAP_MAX_NR_PORTS) {
		printk(KERN_INFO "Console: external UART#%d. "
			"Not adding it as console this time.\n",
			uart_idx + 1);
		return 0;
	}
	if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
		printk(KERN_ERR "Console: Selected UART#%d is "
			"not enabled for this platform\n",
			uart_idx + 1);
		return -1;
	}
	line = 0;
	for (i = 0; i < uart_idx; i++) {
		if (uart_info->enabled_uarts & (1 << i))
			line++;
	}
	return add_preferred_console("ttyS", line, opt);
}
console_initcall(omap_add_serial_console);


/*
 * 32KHz clocksource ... always available, on pretty most chips except
 * OMAP 730 and 1510.  Other timers could be used as clocksources, with
 * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
 * but systems won't necessarily want to spend resources that way.
 */

#if defined(CONFIG_ARCH_OMAP16XX)
#define TIMER_32K_SYNCHRONIZED		0xfffbc410
#elif defined(CONFIG_ARCH_OMAP24XX)
#define TIMER_32K_SYNCHRONIZED		(OMAP24XX_32KSYNCT_BASE + 0x10)
#endif

#ifdef	TIMER_32K_SYNCHRONIZED

#include <linux/clocksource.h>

static cycle_t omap_32k_read(void)
{
	return omap_readl(TIMER_32K_SYNCHRONIZED);
}

static struct clocksource clocksource_32k = {
	.name		= "32k_counter",
	.rating		= 250,
	.read		= omap_32k_read,
	.mask		= CLOCKSOURCE_MASK(32),
	.shift		= 10,
	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
};

static int __init omap_init_clocksource_32k(void)
{
	static char err[] __initdata = KERN_ERR
			"%s: can't register clocksource!\n";

	if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
		clocksource_32k.mult = clocksource_hz2mult(32768,
					    clocksource_32k.shift);

		if (clocksource_register(&clocksource_32k))
			printk(err, clocksource_32k.name);
	}
	return 0;
}
arch_initcall(omap_init_clocksource_32k);

#endif	/* TIMER_32K_SYNCHRONIZED */
Commit	Line	Data
5e1c5ff4 TL	1	/*
	2	* linux/arch/arm/plat-omap/common.c
	3	*
	4	* Code common to all OMAP machines.
	5	*
	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.
	9	*/
5e1c5ff4 TL	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/init.h>
	13	#include <linux/delay.h>
	14	#include <linux/pm.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>
f8ce2547	20	#include <linux/clk.h>
5e1c5ff4 TL	21
	22	#include <asm/hardware.h>
	23	#include <asm/system.h>
	24	#include <asm/pgtable.h>
	25	#include <asm/mach/map.h>
5e1c5ff4	26	#include <asm/io.h>
92105bb7	27	#include <asm/setup.h>
5e1c5ff4 TL	28
	29	#include <asm/arch/board.h>
	30	#include <asm/arch/mux.h>
	31	#include <asm/arch/fpga.h>
	32
1a8bfa1e	33	#include <asm/arch/clock.h>
5e1c5ff4 TL	34
	35	#define NO_LENGTH_CHECK 0xffffffff
	36
92105bb7 TL	37	unsigned char omap_bootloader_tag[512];
92105bb7 TL	38	int omap_bootloader_tag_len;
5e1c5ff4 TL	39
5e1c5ff4 TL	40	struct omap_board_config_kernel *omap_board_config;
92105bb7	41	int omap_board_config_size;
5e1c5ff4 TL	42
	43	static const void get_config(u16 tag, size_t len, int skip, size_t len_out)
	44	{
	45	struct omap_board_config_kernel *kinfo = NULL;
	46	int i;
	47
	48	#ifdef CONFIG_OMAP_BOOT_TAG
	49	struct omap_board_config_entry *info = NULL;
	50
	51	if (omap_bootloader_tag_len > 4)
	52	info = (struct omap_board_config_entry *) omap_bootloader_tag;
	53	while (info != NULL) {
	54	u8 *next;
	55
	56	if (info->tag == tag) {
	57	if (skip == 0)
	58	break;
	59	skip--;
	60	}
	61
	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);
	66	return NULL;
	67	}
	68	next = (u8 ) info + sizeof(info) + info->len;
	69	if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
	70	info = NULL;
	71	else
	72	info = (struct omap_board_config_entry *) next;
	73	}
	74	if (info != NULL) {
	75	/* Check the length as a lame attempt to check for
6cbdc8c5	76	* binary inconsistency. */
5e1c5ff4 TL	77	if (len != NO_LENGTH_CHECK) {
	78	/* Word-align len */
	79	if (len & 0x03)
	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",
	83	tag, len, info->len);
	84	return NULL;
	85	}
	86	}
	87	if (len_out != NULL)
	88	*len_out = info->len;
	89	return info->data;
	90	}
	91	#endif
	92	/* Try to find the config from the board-specific structures
	93	* in the kernel. */
	94	for (i = 0; i < omap_board_config_size; i++) {
	95	if (omap_board_config[i].tag == tag) {
c40fae95 TL	96	if (skip == 0) {
	97	kinfo = &omap_board_config[i];
	98	break;
	99	} else {
	100	skip--;
	101	}
5e1c5ff4 TL	102	}
	103	}
	104	if (kinfo == NULL)
	105	return NULL;
	106	return kinfo->data;
	107	}
	108
	109	const void *__omap_get_config(u16 tag, size_t len, int nr)
	110	{
	111	return get_config(tag, len, nr, NULL);
	112	}
	113	EXPORT_SYMBOL(__omap_get_config);
	114
	115	const void omap_get_var_config(u16 tag, size_t len)
	116	{
	117	return get_config(tag, NO_LENGTH_CHECK, 0, len);
	118	}
	119	EXPORT_SYMBOL(omap_get_var_config);
	120
	121	static int __init omap_add_serial_console(void)
	122	{
1a8bfa1e TL	123	const struct omap_serial_console_config *con_info;
	124	const struct omap_uart_config *uart_info;
	125	static char speed[11], *opt = NULL;
	126	int line, i, uart_idx;
	127
	128	uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
	129	con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
	130	struct omap_serial_console_config);
	131	if (uart_info == NULL \|\| con_info == NULL)
	132	return 0;
	133
	134	if (con_info->console_uart == 0)
	135	return 0;
	136
	137	if (con_info->console_speed) {
	138	snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
	139	opt = speed;
	140	}
5e1c5ff4	141
1a8bfa1e TL	142	uart_idx = con_info->console_uart - 1;
	143	if (uart_idx >= OMAP_MAX_NR_PORTS) {
	144	printk(KERN_INFO "Console: external UART#%d. "
	145	"Not adding it as console this time.\n",
	146	uart_idx + 1);
	147	return 0;
	148	}
	149	if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
	150	printk(KERN_ERR "Console: Selected UART#%d is "
	151	"not enabled for this platform\n",
	152	uart_idx + 1);
	153	return -1;
	154	}
	155	line = 0;
	156	for (i = 0; i < uart_idx; i++) {
	157	if (uart_info->enabled_uarts & (1 << i))
	158	line++;
5e1c5ff4	159	}
1a8bfa1e	160	return add_preferred_console("ttyS", line, opt);
5e1c5ff4 TL	161	}
5e1c5ff4 TL	162	console_initcall(omap_add_serial_console);
075192ae KH	163
	164
	165	/*
	166	* 32KHz clocksource ... always available, on pretty most chips except
	167	* OMAP 730 and 1510. Other timers could be used as clocksources, with
	168	* higher resolution in free-running counter modes (e.g. 12 MHz xtal),
	169	* but systems won't necessarily want to spend resources that way.
	170	*/
	171
	172	#if defined(CONFIG_ARCH_OMAP16XX)
	173	#define TIMER_32K_SYNCHRONIZED 0xfffbc410
	174	#elif defined(CONFIG_ARCH_OMAP24XX)
5c5dccad	175	#define TIMER_32K_SYNCHRONIZED (OMAP24XX_32KSYNCT_BASE + 0x10)
075192ae KH	176	#endif
	177
	178	#ifdef TIMER_32K_SYNCHRONIZED
	179
	180	#include <linux/clocksource.h>
	181
	182	static cycle_t omap_32k_read(void)
	183	{
	184	return omap_readl(TIMER_32K_SYNCHRONIZED);
	185	}
	186
	187	static struct clocksource clocksource_32k = {
	188	.name = "32k_counter",
	189	.rating = 250,
	190	.read = omap_32k_read,
	191	.mask = CLOCKSOURCE_MASK(32),
	192	.shift = 10,
	193	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	194	};
	195
	196	static int __init omap_init_clocksource_32k(void)
	197	{
	198	static char err[] __initdata = KERN_ERR
	199	"%s: can't register clocksource!\n";
	200
	201	if (cpu_is_omap16xx() \|\| cpu_is_omap24xx()) {
	202	clocksource_32k.mult = clocksource_hz2mult(32768,
	203	clocksource_32k.shift);
	204
	205	if (clocksource_register(&clocksource_32k))
	206	printk(err, clocksource_32k.name);
	207	}
	208	return 0;
	209	}
	210	arch_initcall(omap_init_clocksource_32k);
	211
	212	#endif /* TIMER_32K_SYNCHRONIZED */