path: root/arch/arm/mach-omap2/clock.c

/*
 *  linux/arch/arm/mach-omap2/clock.c
 *
 *  Copyright (C) 2005-2008 Texas Instruments, Inc.
 *  Copyright (C) 2004-2010 Nokia Corporation
 *
 *  Contacts:
 *  Richard Woodruff <r-woodruff2@ti.com>
 *  Paul Walmsley
 *
 * 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.
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/bitops.h>

#include <asm/cpu.h>


#include <trace/events/power.h>

#include "soc.h"
#include "clockdomain.h"
#include "clock.h"
#include "cm.h"
#include "cm2xxx.h"
#include "cm3xxx.h"
#include "cm-regbits-24xx.h"
#include "cm-regbits-34xx.h"
#include "common.h"

/*
 * MAX_MODULE_ENABLE_WAIT: maximum of number of microseconds to wait
 * for a module to indicate that it is no longer in idle
 */
#define MAX_MODULE_ENABLE_WAIT		100000

u16 cpu_mask;

/*
 * clkdm_control: if true, then when a clock is enabled in the
 * hardware, its clockdomain will first be enabled; and when a clock
 * is disabled in the hardware, its clockdomain will be disabled
 * afterwards.
 */
static bool clkdm_control = true;

static LIST_HEAD(clk_hw_omap_clocks);

/*
 * Used for clocks that have the same value as the parent clock,
 * divided by some factor
 */
unsigned long omap_fixed_divisor_recalc(struct clk_hw *hw,
		unsigned long parent_rate)
{
	struct clk_hw_omap *oclk;

	if (!hw) {
		pr_warn("%s: hw is NULL\n", __func__);
		return -EINVAL;
	}

	oclk = to_clk_hw_omap(hw);

	WARN_ON(!oclk->fixed_div);

	return parent_rate / oclk->fixed_div;
}

/*
 * OMAP2+ specific clock functions
 */

/* Private functions */


/**
 * _wait_idlest_generic - wait for a module to leave the idle state
 * @reg: virtual address of module IDLEST register
 * @mask: value to mask against to determine if the module is active
 * @idlest: idle state indicator (0 or 1) for the clock
 * @name: name of the clock (for printk)
 *
 * Wait for a module to leave idle, where its idle-status register is
 * not inside the CM module.  Returns 1 if the module left idle
 * promptly, or 0 if the module did not leave idle before the timeout
 * elapsed.  XXX Deprecated - should be moved into drivers for the
 * individual IP block that the IDLEST register exists in.
 */
static int _wait_idlest_generic(void __iomem *reg, u32 mask, u8 idlest,
				const char *name)
{
	int i = 0, ena = 0;

	ena = (idlest) ? 0 : mask;

	omap_test_timeout(((__raw_readl(reg) & mask) == ena),
			  MAX_MODULE_ENABLE_WAIT, i);

	if (i < MAX_MODULE_ENABLE_WAIT)
		pr_debug("omap clock: module associated with clock %s ready after %d loops\n",
			 name, i);
	else
		pr_err("omap clock: module associated with clock %s didn't enable in %d tries\n",
		       name, MAX_MODULE_ENABLE_WAIT);

	return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0;
};

/**
 * _omap2_module_wait_ready - wait for an OMAP module to leave IDLE
 * @clk: struct clk * belonging to the module
 *
 * If the necessary clocks for the OMAP hardware IP block that
 * corresponds to clock @clk are enabled, then wait for the module to
 * indicate readiness (i.e., to leave IDLE).  This code does not
 * belong in the clock code and will be moved in the medium term to
 * module-dependent code.  No return value.
 */
static void _omap2_module_wait_ready(struct clk_hw_omap *clk)
{
	void __iomem *companion_reg, *idlest_reg;
	u8 other_bit, idlest_bit, idlest_val, idlest_reg_id;
	s16 prcm_mod;
	int r;

	/* Not all modules have multiple clocks that their IDLEST depends on */
	if (clk->ops->find_companion) {
		clk->ops->find_companion(clk, &companion_reg, &other_bit);
		if (!(__raw_readl(companion_reg) & (1 << other_bit)))
			return;
	}

	clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);
	r = cm_split_idlest_reg(idlest_reg, &prcm_mod, &idlest_reg_id);
	if (r) {
		/* IDLEST register not in the CM module */
		_wait_idlest_generic(idlest_reg, (1 << idlest_bit), idlest_val,
				     __clk_get_name(clk->hw.clk));
	} else {
		cm_wait_module_ready(prcm_mod, idlest_reg_id, idlest_bit);
	};
}

/* Public functions */

/**
 * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
 * @clk: OMAP clock struct ptr to use
 *
 * Convert a clockdomain name stored in a struct clk 'clk' into a
 * clockdomain pointer, and save it into the struct clk.  Intended to be
 * called during clk_register().  No return value.
 */
void omap2_init_clk_clkdm(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	struct clockdomain *clkdm;
	const char *clk_name;

	if (!clk->clkdm_name)
		return;

	clk_name = __clk_get_name(hw->clk);

	clkdm = clkdm_lookup(clk->clkdm_name);
	if (clkdm) {
		pr_debug("clock: associated clk %s to clkdm %s\n",
			 clk_name, clk->clkdm_name);
		clk->clkdm = clkdm;
	} else {
		pr_debug("clock: could not associate clk %s to clkdm %s\n",
			 clk_name, clk->clkdm_name);
	}
}

/**
 * omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable
 *
 * Prevent the OMAP clock code from calling into the clockdomain code
 * when a hardware clock in that clockdomain is enabled or disabled.
 * Intended to be called at init time from omap*_clk_init().  No
 * return value.
 */
void __init omap2_clk_disable_clkdm_control(void)
{
	clkdm_control = false;
}

/**
 * omap2_clk_dflt_find_companion - find companion clock to @clk
 * @clk: struct clk * to find the companion clock of
 * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
 * @other_bit: u8 ** to return the companion clock bit shift in
 *
 * Note: We don't need special code here for INVERT_ENABLE for the
 * time being since INVERT_ENABLE only applies to clocks enabled by
 * CM_CLKEN_PLL
 *
 * Convert CM_ICLKEN* <-> CM_FCLKEN*.  This conversion assumes it's
 * just a matter of XORing the bits.
 *
 * Some clocks don't have companion clocks.  For example, modules with
 * only an interface clock (such as MAILBOXES) don't have a companion
 * clock.  Right now, this code relies on the hardware exporting a bit
 * in the correct companion register that indicates that the
 * nonexistent 'companion clock' is active.  Future patches will
 * associate this type of code with per-module data structures to
 * avoid this issue, and remove the casts.  No return value.
 */
void omap2_clk_dflt_find_companion(struct clk_hw_omap *clk,
			void __iomem **other_reg, u8 *other_bit)
{
	u32 r;

	/*
	 * Convert CM_ICLKEN* <-> CM_FCLKEN*.  This conversion assumes
	 * it's just a matter of XORing the bits.
	 */
	r = ((__force u32)clk->enable_reg ^ (CM_FCLKEN ^ CM_ICLKEN));

	*other_reg = (__force void __iomem *)r;
	*other_bit = clk->enable_bit;
}

/**
 * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk
 * @clk: struct clk * to find IDLEST info for
 * @idlest_reg: void __iomem ** to return the CM_IDLEST va in
 * @idlest_bit: u8 * to return the CM_IDLEST bit shift in
 * @idlest_val: u8 * to return the idle status indicator
 *
 * Return the CM_IDLEST register address and bit shift corresponding
 * to the module that "owns" this clock.  This default code assumes
 * that the CM_IDLEST bit shift is the CM_*CLKEN bit shift, and that
 * the IDLEST register address ID corresponds to the CM_*CLKEN
 * register address ID (e.g., that CM_FCLKEN2 corresponds to
 * CM_IDLEST2).  This is not true for all modules.  No return value.
 */
void omap2_clk_dflt_find_idlest(struct clk_hw_omap *clk,
		void __iomem **idlest_reg, u8 *idlest_bit, u8 *idlest_val)
{
	u32 r;

	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
	*idlest_reg = (__force void __iomem *)r;
	*idlest_bit = clk->enable_bit;

	/*
	 * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
	 * 34xx reverses this, just to keep us on our toes
	 * AM35xx uses both, depending on the module.
	 */
	if (cpu_is_omap24xx())
		*idlest_val = OMAP24XX_CM_IDLEST_VAL;
	else if (cpu_is_omap34xx())
		*idlest_val = OMAP34XX_CM_IDLEST_VAL;
	else
		BUG();

}

/**
 * omap2_dflt_clk_enable - enable a clock in the hardware
 * @hw: struct clk_hw * of the clock to enable
 *
 * Enable the clock @hw in the hardware.  We first call into the OMAP
 * clockdomain code to "enable" the corresponding clockdomain if this
 * is the first enabled user of the clockdomain.  Then program the
 * hardware to enable the clock.  Then wait for the IP block that uses
 * this clock to leave idle (if applicable).  Returns the error value
 * from clkdm_clk_enable() if it terminated with an error, or -EINVAL
 * if @hw has a null clock enable_reg, or zero upon success.
 */
int omap2_dflt_clk_enable(struct clk_hw *hw)
{
	struct clk_hw_omap *clk;
	u32 v;
	int ret = 0;

	clk = to_clk_hw_omap(hw);

	if (clkdm_control && clk->clkdm) {
		ret = clkdm_clk_enable(clk->clkdm, hw->clk);
		if (ret) {
			WARN(1, "%s: could not enable %s's clockdomain %s: %d\n",
			     __func__, __clk_get_name(</