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common.c

/*
 * linux/arch/arm/plat-omap/common.c
 *
 * Code common to all OMAP machines.
 * The file is created by Tony Lindgren <tony@atomide.com>
 *
 * Copyright (C) 2009 Texas Instruments
 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
 *
 * 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/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 <linux/io.h>

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

#include <mach/common.h>
#include <mach/board.h>
#include <mach/control.h>
#include <mach/mux.h>
#include <mach/fpga.h>

#include <mach/clock.h>

#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
# include "../mach-omap2/sdrc.h"
#endif

#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;

      /* 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);

/*
 * 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.
 */

#define OMAP16XX_TIMER_32K_SYNCHRONIZED         0xfffbc410

#if !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX))

#include <linux/clocksource.h>

#ifdef CONFIG_ARCH_OMAP16XX
static cycle_t omap16xx_32k_read(struct clocksource *cs)
{
      return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED);
}
#else
#define omap16xx_32k_read     NULL
#endif

#ifdef CONFIG_ARCH_OMAP2420
static cycle_t omap2420_32k_read(struct clocksource *cs)
{
      return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10);
}
#else
#define omap2420_32k_read     NULL
#endif

#ifdef CONFIG_ARCH_OMAP2430
static cycle_t omap2430_32k_read(struct clocksource *cs)
{
      return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10);
}
#else
#define omap2430_32k_read     NULL
#endif

#ifdef CONFIG_ARCH_OMAP34XX
static cycle_t omap34xx_32k_read(struct clocksource *cs)
{
      return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10);
}
#else
#define omap34xx_32k_read     NULL
#endif

#ifdef CONFIG_ARCH_OMAP4
static cycle_t omap44xx_32k_read(struct clocksource *cs)
{
      return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10);
}
#else
#define omap44xx_32k_read     NULL
#endif

/*
 * Kernel assumes that sched_clock can be called early but may not have
 * things ready yet.
 */
static cycle_t omap_32k_read_dummy(struct clocksource *cs)
{
      return 0;
}

static struct clocksource clocksource_32k = {
      .name       = "32k_counter",
      .rating           = 250,
      .read       = omap_32k_read_dummy,
      .mask       = CLOCKSOURCE_MASK(32),
      .shift            = 10,
      .flags            = CLOCK_SOURCE_IS_CONTINUOUS,
};

/*
 * Returns current time from boot in nsecs. It's OK for this to wrap
 * around for now, as it's just a relative time stamp.
 */
unsigned long long sched_clock(void)
{
      return clocksource_cyc2ns(clocksource_32k.read(&clocksource_32k),
                          clocksource_32k.mult, clocksource_32k.shift);
}

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_class_is_omap2()) {
            struct clk *sync_32k_ick;

            if (cpu_is_omap16xx())
                  clocksource_32k.read = omap16xx_32k_read;
            else if (cpu_is_omap2420())
                  clocksource_32k.read = omap2420_32k_read;
            else if (cpu_is_omap2430())
                  clocksource_32k.read = omap2430_32k_read;
            else if (cpu_is_omap34xx())
                  clocksource_32k.read = omap34xx_32k_read;
            else if (cpu_is_omap44xx())
                  clocksource_32k.read = omap44xx_32k_read;
            else
                  return -ENODEV;

            sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
            if (sync_32k_ick)
                  clk_enable(sync_32k_ick);

            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      /* !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX)) */

/* Global address base setup code */

#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)

static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
{
      omap2_set_globals_tap(omap2_globals);
      omap2_set_globals_sdrc(omap2_globals);
      omap2_set_globals_control(omap2_globals);
      omap2_set_globals_prcm(omap2_globals);
}

#endif

#if defined(CONFIG_ARCH_OMAP2420)

static struct omap_globals omap242x_globals = {
      .class      = OMAP242X_CLASS,
      .tap  = OMAP2_IO_ADDRESS(0x48014000),
      .sdrc = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
      .sms  = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
      .ctrl = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
      .prm  = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
      .cm   = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
};

void __init omap2_set_globals_242x(void)
{
      __omap2_set_globals(&omap242x_globals);
}
#endif

#if defined(CONFIG_ARCH_OMAP2430)

static struct omap_globals omap243x_globals = {
      .class      = OMAP243X_CLASS,
      .tap  = OMAP2_IO_ADDRESS(0x4900a000),
      .sdrc = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
      .sms  = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
      .ctrl = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
      .prm  = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
      .cm   = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
};

void __init omap2_set_globals_243x(void)
{
      __omap2_set_globals(&omap243x_globals);
}
#endif

#if defined(CONFIG_ARCH_OMAP3430)

static struct omap_globals omap343x_globals = {
      .class      = OMAP343X_CLASS,
      .tap  = OMAP2_IO_ADDRESS(0x4830A000),
      .sdrc = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
      .sms  = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
      .ctrl = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
      .prm  = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
      .cm   = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
};

void __init omap2_set_globals_343x(void)
{
      __omap2_set_globals(&omap343x_globals);
}
#endif

#if defined(CONFIG_ARCH_OMAP4)
static struct omap_globals omap4_globals = {
      .class      = OMAP443X_CLASS,
      .tap  = OMAP2_IO_ADDRESS(0x4830a000),
      .ctrl = OMAP2_IO_ADDRESS(OMAP443X_CTRL_BASE),
      .prm  = OMAP2_IO_ADDRESS(OMAP4430_PRM_BASE),
      .cm   = OMAP2_IO_ADDRESS(OMAP4430_CM_BASE),
};

void __init omap2_set_globals_443x(void)
{
      omap2_set_globals_tap(&omap4_globals);
      omap2_set_globals_control(&omap4_globals);
}
#endif


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