omap_hwmod.c 42.2 KB
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/*
 * omap_hwmod implementation for OMAP2/3/4
 *
 * Copyright (C) 2009 Nokia Corporation
 * Paul Walmsley
 * With fixes and testing from Kevin Hilman
 *
 * Created in collaboration with (alphabetical order): Benoit Cousson,
 * Kevin Hilman, Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari
 * Poussa, Anand Sawant, Santosh Shilimkar, Richard Woodruff
 *
 * 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.
 *
 * This code manages "OMAP modules" (on-chip devices) and their
 * integration with Linux device driver and bus code.
 *
 * References:
 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
 * - Open Core Protocol Specification 2.2
 *
 * To do:
 * - pin mux handling
 * - handle IO mapping
 * - bus throughput & module latency measurement code
 *
 * XXX add tests at the beginning of each function to ensure the hwmod is
 * in the appropriate state
 * XXX error return values should be checked to ensure that they are
 * appropriate
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/bootmem.h>

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#include <plat/common.h>
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#include <plat/cpu.h>
#include <plat/clockdomain.h>
#include <plat/powerdomain.h>
#include <plat/clock.h>
#include <plat/omap_hwmod.h>
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#include "cm.h"

/* Maximum microseconds to wait for OMAP module to reset */
#define MAX_MODULE_RESET_WAIT		10000

/* Name of the OMAP hwmod for the MPU */
#define MPU_INITIATOR_NAME		"mpu_hwmod"

/* omap_hwmod_list contains all registered struct omap_hwmods */
static LIST_HEAD(omap_hwmod_list);

static DEFINE_MUTEX(omap_hwmod_mutex);

/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
static struct omap_hwmod *mpu_oh;

/* inited: 0 if omap_hwmod_init() has not yet been called; 1 otherwise */
static u8 inited;


/* Private functions */

/**
 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
 * @oh: struct omap_hwmod *
 *
 * Load the current value of the hwmod OCP_SYSCONFIG register into the
 * struct omap_hwmod for later use.  Returns -EINVAL if the hwmod has no
 * OCP_SYSCONFIG register or 0 upon success.
 */
static int _update_sysc_cache(struct omap_hwmod *oh)
{
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	if (!oh->class->sysc) {
		WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
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		return -EINVAL;
	}

	/* XXX ensure module interface clock is up */

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	oh->_sysc_cache = omap_hwmod_readl(oh, oh->class->sysc->sysc_offs);
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	if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
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		oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
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	return 0;
}

/**
 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
 * @v: OCP_SYSCONFIG value to write
 * @oh: struct omap_hwmod *
 *
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 * Write @v into the module class' OCP_SYSCONFIG register, if it has
 * one.  No return value.
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 */
static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
{
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	if (!oh->class->sysc) {
		WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
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		return;
	}

	/* XXX ensure module interface clock is up */

	if (oh->_sysc_cache != v) {
		oh->_sysc_cache = v;
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		omap_hwmod_writel(v, oh, oh->class->sysc->sysc_offs);
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	}
}

/**
 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
 * @oh: struct omap_hwmod *
 * @standbymode: MIDLEMODE field bits
 * @v: pointer to register contents to modify
 *
 * Update the master standby mode bits in @v to be @standbymode for
 * the @oh hwmod.  Does not write to the hardware.  Returns -EINVAL
 * upon error or 0 upon success.
 */
static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
				   u32 *v)
{
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	u32 mstandby_mask;
	u8 mstandby_shift;

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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
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		return -EINVAL;

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	if (!oh->class->sysc->sysc_fields) {
		WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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		return -EINVAL;
	}

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	mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
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	mstandby_mask = (0x3 << mstandby_shift);

	*v &= ~mstandby_mask;
	*v |= __ffs(standbymode) << mstandby_shift;
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	return 0;
}

/**
 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
 * @oh: struct omap_hwmod *
 * @idlemode: SIDLEMODE field bits
 * @v: pointer to register contents to modify
 *
 * Update the slave idle mode bits in @v to be @idlemode for the @oh
 * hwmod.  Does not write to the hardware.  Returns -EINVAL upon error
 * or 0 upon success.
 */
static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
{
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	u32 sidle_mask;
	u8 sidle_shift;

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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
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		return -EINVAL;

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	if (!oh->class->sysc->sysc_fields) {
		WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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		return -EINVAL;
	}

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	sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
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	sidle_mask = (0x3 << sidle_shift);

	*v &= ~sidle_mask;
	*v |= __ffs(idlemode) << sidle_shift;
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	return 0;
}

/**
 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
 * @oh: struct omap_hwmod *
 * @clockact: CLOCKACTIVITY field bits
 * @v: pointer to register contents to modify
 *
 * Update the clockactivity mode bits in @v to be @clockact for the
 * @oh hwmod.  Used for additional powersaving on some modules.  Does
 * not write to the hardware.  Returns -EINVAL upon error or 0 upon
 * success.
 */
static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
{
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	u32 clkact_mask;
	u8  clkact_shift;

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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
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		return -EINVAL;

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	if (!oh->class->sysc->sysc_fields) {
		WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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		return -EINVAL;
	}

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	clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
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	clkact_mask = (0x3 << clkact_shift);

	*v &= ~clkact_mask;
	*v |= clockact << clkact_shift;
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	return 0;
}

/**
 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
 * @oh: struct omap_hwmod *
 * @v: pointer to register contents to modify
 *
 * Set the SOFTRESET bit in @v for hwmod @oh.  Returns -EINVAL upon
 * error or 0 upon success.
 */
static int _set_softreset(struct omap_hwmod *oh, u32 *v)
{
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	u32 softrst_mask;

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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
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		return -EINVAL;

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	if (!oh->class->sysc->sysc_fields) {
		WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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		return -EINVAL;
	}

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	softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
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	*v |= softrst_mask;
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	return 0;
}

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/**
 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
 * @oh: struct omap_hwmod *
 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
 * @v: pointer to register contents to modify
 *
 * Update the module autoidle bit in @v to be @autoidle for the @oh
 * hwmod.  The autoidle bit controls whether the module can gate
 * internal clocks automatically when it isn't doing anything; the
 * exact function of this bit varies on a per-module basis.  This
 * function does not write to the hardware.  Returns -EINVAL upon
 * error or 0 upon success.
 */
static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
				u32 *v)
{
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	u32 autoidle_mask;
	u8 autoidle_shift;

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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
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		return -EINVAL;

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	if (!oh->class->sysc->sysc_fields) {
		WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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		return -EINVAL;
	}

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	autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
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	autoidle_mask = (0x3 << autoidle_shift);

	*v &= ~autoidle_mask;
	*v |= autoidle << autoidle_shift;
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	return 0;
}

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/**
 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
 * @oh: struct omap_hwmod *
 *
 * Allow the hardware module @oh to send wakeups.  Returns -EINVAL
 * upon error or 0 upon success.
 */
static int _enable_wakeup(struct omap_hwmod *oh)
{
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	u32 v, wakeup_mask;
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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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		return -EINVAL;

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	if (!oh->class->sysc->sysc_fields) {
		WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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		return -EINVAL;
	}

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	wakeup_mask = (0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
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	v = oh->_sysc_cache;
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	v |= wakeup_mask;
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	_write_sysconfig(v, oh);

	/* XXX test pwrdm_get_wken for this hwmod's subsystem */

	oh->_int_flags |= _HWMOD_WAKEUP_ENABLED;

	return 0;
}

/**
 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
 * @oh: struct omap_hwmod *
 *
 * Prevent the hardware module @oh to send wakeups.  Returns -EINVAL
 * upon error or 0 upon success.
 */
static int _disable_wakeup(struct omap_hwmod *oh)
{
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	u32 v, wakeup_mask;
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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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		return -EINVAL;

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	if (!oh->class->sysc->sysc_fields) {
		WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
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		return -EINVAL;
	}

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	wakeup_mask = (0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
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	v = oh->_sysc_cache;
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	v &= ~wakeup_mask;
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	_write_sysconfig(v, oh);

	/* XXX test pwrdm_get_wken for this hwmod's subsystem */

	oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED;

	return 0;
}

/**
 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
 * @oh: struct omap_hwmod *
 *
 * Prevent the hardware module @oh from entering idle while the
 * hardare module initiator @init_oh is active.  Useful when a module
 * will be accessed by a particular initiator (e.g., if a module will
 * be accessed by the IVA, there should be a sleepdep between the IVA
 * initiator and the module).  Only applies to modules in smart-idle
 * mode.  Returns -EINVAL upon error or passes along
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 * clkdm_add_sleepdep() value upon success.
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 */
static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
{
	if (!oh->_clk)
		return -EINVAL;

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	return clkdm_add_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
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}

/**
 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
 * @oh: struct omap_hwmod *
 *
 * Allow the hardware module @oh to enter idle while the hardare
 * module initiator @init_oh is active.  Useful when a module will not
 * be accessed by a particular initiator (e.g., if a module will not
 * be accessed by the IVA, there should be no sleepdep between the IVA
 * initiator and the module).  Only applies to modules in smart-idle
 * mode.  Returns -EINVAL upon error or passes along
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 * clkdm_del_sleepdep() value upon success.
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 */
static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
{
	if (!oh->_clk)
		return -EINVAL;

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	return clkdm_del_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
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}

/**
 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
 * @oh: struct omap_hwmod *
 *
 * Called from _init_clocks().  Populates the @oh _clk (main
 * functional clock pointer) if a main_clk is present.  Returns 0 on
 * success or -EINVAL on error.
 */
static int _init_main_clk(struct omap_hwmod *oh)
{
	struct clk *c;
	int ret = 0;

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	if (!oh->main_clk)
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		return 0;

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	c = omap_clk_get_by_name(oh->main_clk);
	WARN(IS_ERR(c), "omap_hwmod: %s: cannot clk_get main_clk %s\n",
	     oh->name, oh->main_clk);
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	if (IS_ERR(c))
		ret = -EINVAL;
	oh->_clk = c;

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	WARN(!c->clkdm, "omap_hwmod: %s: missing clockdomain for %s.\n",
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	     oh->main_clk, c->name);
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	return ret;
}

/**
 * _init_interface_clk - get a struct clk * for the the hwmod's interface clks
 * @oh: struct omap_hwmod *
 *
 * Called from _init_clocks().  Populates the @oh OCP slave interface
 * clock pointers.  Returns 0 on success or -EINVAL on error.
 */
static int _init_interface_clks(struct omap_hwmod *oh)
{
	struct clk *c;
	int i;
	int ret = 0;

	if (oh->slaves_cnt == 0)
		return 0;

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	for (i = 0; i < oh->slaves_cnt; i++) {
		struct omap_hwmod_ocp_if *os = oh->slaves[i];

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		if (!os->clk)
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			continue;

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		c = omap_clk_get_by_name(os->clk);
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		WARN(IS_ERR(c), "omap_hwmod: %s: cannot clk_get "
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		     "interface_clk %s\n", oh->name, os->clk);
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		if (IS_ERR(c))
			ret = -EINVAL;
		os->_clk = c;
	}

	return ret;
}

/**
 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
 * @oh: struct omap_hwmod *
 *
 * Called from _init_clocks().  Populates the @oh omap_hwmod_opt_clk
 * clock pointers.  Returns 0 on success or -EINVAL on error.
 */
static int _init_opt_clks(struct omap_hwmod *oh)
{
	struct omap_hwmod_opt_clk *oc;
	struct clk *c;
	int i;
	int ret = 0;

	for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
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		c = omap_clk_get_by_name(oc->clk);
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		WARN(IS_ERR(c), "omap_hwmod: %s: cannot clk_get opt_clk "
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		     "%s\n", oh->name, oc->clk);
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		if (IS_ERR(c))
			ret = -EINVAL;
		oc->_clk = c;
	}

	return ret;
}

/**
 * _enable_clocks - enable hwmod main clock and interface clocks
 * @oh: struct omap_hwmod *
 *
 * Enables all clocks necessary for register reads and writes to succeed
 * on the hwmod @oh.  Returns 0.
 */
static int _enable_clocks(struct omap_hwmod *oh)
{
	int i;

	pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);

	if (oh->_clk && !IS_ERR(oh->_clk))
		clk_enable(oh->_clk);

	if (oh->slaves_cnt > 0) {
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		for (i = 0; i < oh->slaves_cnt; i++) {
			struct omap_hwmod_ocp_if *os = oh->slaves[i];
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			struct clk *c = os->_clk;

			if (c && !IS_ERR(c) && (os->flags & OCPIF_SWSUP_IDLE))
				clk_enable(c);
		}
	}

	/* The opt clocks are controlled by the device driver. */

	return 0;
}

/**
 * _disable_clocks - disable hwmod main clock and interface clocks
 * @oh: struct omap_hwmod *
 *
 * Disables the hwmod @oh main functional and interface clocks.  Returns 0.
 */
static int _disable_clocks(struct omap_hwmod *oh)
{
	int i;

	pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);

	if (oh->_clk && !IS_ERR(oh->_clk))
		clk_disable(oh->_clk);

	if (oh->slaves_cnt > 0) {
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		for (i = 0; i < oh->slaves_cnt; i++) {
			struct omap_hwmod_ocp_if *os = oh->slaves[i];
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			struct clk *c = os->_clk;

			if (c && !IS_ERR(c) && (os->flags & OCPIF_SWSUP_IDLE))
				clk_disable(c);
		}
	}

	/* The opt clocks are controlled by the device driver. */

	return 0;
}

/**
 * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
 * @oh: struct omap_hwmod *
 *
 * Returns the array index of the OCP slave port that the MPU
 * addresses the device on, or -EINVAL upon error or not found.
 */
static int _find_mpu_port_index(struct omap_hwmod *oh)
{
	int i;
	int found = 0;

	if (!oh || oh->slaves_cnt == 0)
		return -EINVAL;

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	for (i = 0; i < oh->slaves_cnt; i++) {
		struct omap_hwmod_ocp_if *os = oh->slaves[i];

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		if (os->user & OCP_USER_MPU) {
			found = 1;
			break;
		}
	}

	if (found)
		pr_debug("omap_hwmod: %s: MPU OCP slave port ID  %d\n",
			 oh->name, i);
	else
		pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
			 oh->name);

	return (found) ? i : -EINVAL;
}

/**
 * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
 * @oh: struct omap_hwmod *
 *
 * Return the virtual address of the base of the register target of
 * device @oh, or NULL on error.
 */
static void __iomem *_find_mpu_rt_base(struct omap_hwmod *oh, u8 index)
{
	struct omap_hwmod_ocp_if *os;
	struct omap_hwmod_addr_space *mem;
	int i;
	int found = 0;
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	void __iomem *va_start;
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	if (!oh || oh->slaves_cnt == 0)
		return NULL;

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	os = oh->slaves[index];
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	for (i = 0, mem = os->addr; i < os->addr_cnt; i++, mem++) {
		if (mem->flags & ADDR_TYPE_RT) {
			found = 1;
			break;
		}
	}

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	if (found) {
		va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
		if (!va_start) {
			pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
			return NULL;
		}
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		pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
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			 oh->name, va_start);
	} else {
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		pr_debug("omap_hwmod: %s: no MPU register target found\n",
			 oh->name);
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	}
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	return (found) ? va_start : NULL;
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}

/**
 * _sysc_enable - try to bring a module out of idle via OCP_SYSCONFIG
 * @oh: struct omap_hwmod *
 *
 * If module is marked as SWSUP_SIDLE, force the module out of slave
 * idle; otherwise, configure it for smart-idle.  If module is marked
 * as SWSUP_MSUSPEND, force the module out of master standby;
 * otherwise, configure it for smart-standby.  No return value.
 */
static void _sysc_enable(struct omap_hwmod *oh)
{
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	u8 idlemode, sf;
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	u32 v;

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	if (!oh->class->sysc)
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		return;

	v = oh->_sysc_cache;
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	sf = oh->class->sysc->sysc_flags;
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	if (sf & SYSC_HAS_SIDLEMODE) {
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		idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
			HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
		_set_slave_idlemode(oh, idlemode, &v);
	}

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	if (sf & SYSC_HAS_MIDLEMODE) {
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		idlemode = (oh->flags & HWMOD_SWSUP_MSTANDBY) ?
			HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
		_set_master_standbymode(oh, idlemode, &v);
	}

655
	if (sf & SYSC_HAS_AUTOIDLE) {
656 657 658 659 660 661
		idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
			0 : 1;
		_set_module_autoidle(oh, idlemode, &v);
	}

	/* XXX OCP ENAWAKEUP bit? */
662

663 664 665 666 667
	/*
	 * XXX The clock framework should handle this, by
	 * calling into this code.  But this must wait until the
	 * clock structures are tagged with omap_hwmod entries
	 */
668 669 670
	if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
	    (sf & SYSC_HAS_CLOCKACTIVITY))
		_set_clockactivity(oh, oh->class->sysc->clockact, &v);
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685

	_write_sysconfig(v, oh);
}

/**
 * _sysc_idle - try to put a module into idle via OCP_SYSCONFIG
 * @oh: struct omap_hwmod *
 *
 * If module is marked as SWSUP_SIDLE, force the module into slave
 * idle; otherwise, configure it for smart-idle.  If module is marked
 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
 * configure it for smart-standby.  No return value.
 */
static void _sysc_idle(struct omap_hwmod *oh)
{
686
	u8 idlemode, sf;
687 688
	u32 v;

689
	if (!oh->class->sysc)
690 691 692
		return;

	v = oh->_sysc_cache;
693
	sf = oh->class->sysc->sysc_flags;
694

695
	if (sf & SYSC_HAS_SIDLEMODE) {
696 697 698 699 700
		idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
			HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART;
		_set_slave_idlemode(oh, idlemode, &v);
	}

701
	if (sf & SYSC_HAS_MIDLEMODE) {
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
		idlemode = (oh->flags & HWMOD_SWSUP_MSTANDBY) ?
			HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART;
		_set_master_standbymode(oh, idlemode, &v);
	}

	_write_sysconfig(v, oh);
}

/**
 * _sysc_shutdown - force a module into idle via OCP_SYSCONFIG
 * @oh: struct omap_hwmod *
 *
 * Force the module into slave idle and master suspend. No return
 * value.
 */
static void _sysc_shutdown(struct omap_hwmod *oh)
{
	u32 v;
720
	u8 sf;
721

722
	if (!oh->class->sysc)
723 724 725
		return;

	v = oh->_sysc_cache;
726
	sf = oh->class->sysc->sysc_flags;
727

728
	if (sf & SYSC_HAS_SIDLEMODE)
729 730
		_set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);

731
	if (sf & SYSC_HAS_MIDLEMODE)
732 733
		_set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);

734
	if (sf & SYSC_HAS_AUTOIDLE)
735
		_set_module_autoidle(oh, 1, &v);
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810

	_write_sysconfig(v, oh);
}

/**
 * _lookup - find an omap_hwmod by name
 * @name: find an omap_hwmod by name
 *
 * Return a pointer to an omap_hwmod by name, or NULL if not found.
 * Caller must hold omap_hwmod_mutex.
 */
static struct omap_hwmod *_lookup(const char *name)
{
	struct omap_hwmod *oh, *temp_oh;

	oh = NULL;

	list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
		if (!strcmp(name, temp_oh->name)) {
			oh = temp_oh;
			break;
		}
	}

	return oh;
}

/**
 * _init_clocks - clk_get() all clocks associated with this hwmod
 * @oh: struct omap_hwmod *
 *
 * Called by omap_hwmod_late_init() (after omap2_clk_init()).
 * Resolves all clock names embedded in the hwmod.  Must be called
 * with omap_hwmod_mutex held.  Returns -EINVAL if the omap_hwmod
 * has not yet been registered or if the clocks have already been
 * initialized, 0 on success, or a non-zero error on failure.
 */
static int _init_clocks(struct omap_hwmod *oh)
{
	int ret = 0;

	if (!oh || (oh->_state != _HWMOD_STATE_REGISTERED))
		return -EINVAL;

	pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);

	ret |= _init_main_clk(oh);
	ret |= _init_interface_clks(oh);
	ret |= _init_opt_clks(oh);

	oh->_state = _HWMOD_STATE_CLKS_INITED;

	return ret;
}

/**
 * _wait_target_ready - wait for a module to leave slave idle
 * @oh: struct omap_hwmod *
 *
 * Wait for a module @oh to leave slave idle.  Returns 0 if the module
 * does not have an IDLEST bit or if the module successfully leaves
 * slave idle; otherwise, pass along the return value of the
 * appropriate *_cm_wait_module_ready() function.
 */
static int _wait_target_ready(struct omap_hwmod *oh)
{
	struct omap_hwmod_ocp_if *os;
	int ret;

	if (!oh)
		return -EINVAL;

	if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
		return 0;

811
	os = oh->slaves[oh->_mpu_port_index];
812

813
	if (oh->flags & HWMOD_NO_IDLEST)
814 815 816 817 818 819 820 821 822 823 824
		return 0;

	/* XXX check module SIDLEMODE */

	/* XXX check clock enable states */

	if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
		ret = omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
						 oh->prcm.omap2.idlest_reg_id,
						 oh->prcm.omap2.idlest_idle_bit);
	} else if (cpu_is_omap44xx()) {
825
		ret = omap4_cm_wait_module_ready(oh->prcm.omap4.clkctrl_reg);
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
	} else {
		BUG();
	};

	return ret;
}

/**
 * _reset - reset an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit.  hwmod must be
 * enabled for this to work.  Must be called with omap_hwmod_mutex
 * held.  Returns -EINVAL if the hwmod cannot be reset this way or if
 * the hwmod is in the wrong state, -ETIMEDOUT if the module did not
 * reset in time, or 0 upon success.
 */
static int _reset(struct omap_hwmod *oh)
{
	u32 r, v;
846
	int c = 0;
847

848 849 850
	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET) ||
	    (oh->class->sysc->sysc_flags & SYSS_MISSING))
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
		return -EINVAL;

	/* clocks must be on for this operation */
	if (oh->_state != _HWMOD_STATE_ENABLED) {
		WARN(1, "omap_hwmod: %s: reset can only be entered from "
		     "enabled state\n", oh->name);
		return -EINVAL;
	}

	pr_debug("omap_hwmod: %s: resetting\n", oh->name);

	v = oh->_sysc_cache;
	r = _set_softreset(oh, &v);
	if (r)
		return r;
	_write_sysconfig(v, oh);

868
	omap_test_timeout((omap_hwmod_readl(oh, oh->class->sysc->syss_offs) &
869 870
			   SYSS_RESETDONE_MASK),
			  MAX_MODULE_RESET_WAIT, c);
871 872 873 874 875

	if (c == MAX_MODULE_RESET_WAIT)
		WARN(1, "omap_hwmod: %s: failed to reset in %d usec\n",
		     oh->name, MAX_MODULE_RESET_WAIT);
	else
876
		pr_debug("omap_hwmod: %s: reset in %d usec\n", oh->name, c);
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914

	/*
	 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
	 * _wait_target_ready() or _reset()
	 */

	return (c == MAX_MODULE_RESET_WAIT) ? -ETIMEDOUT : 0;
}

/**
 * _enable - enable an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
 * register target.  Must be called with omap_hwmod_mutex held.
 * Returns -EINVAL if the hwmod is in the wrong state or passes along
 * the return value of _wait_target_ready().
 */
static int _enable(struct omap_hwmod *oh)
{
	int r;

	if (oh->_state != _HWMOD_STATE_INITIALIZED &&
	    oh->_state != _HWMOD_STATE_IDLE &&
	    oh->_state != _HWMOD_STATE_DISABLED) {
		WARN(1, "omap_hwmod: %s: enabled state can only be entered "
		     "from initialized, idle, or disabled state\n", oh->name);
		return -EINVAL;
	}

	pr_debug("omap_hwmod: %s: enabling\n", oh->name);

	/* XXX mux balls */

	_add_initiator_dep(oh, mpu_oh);
	_enable_clocks(oh);

	r = _wait_target_ready(oh);
915
	if (!r) {
916 917
		oh->_state = _HWMOD_STATE_ENABLED;

918 919 920 921 922 923 924 925 926 927 928
		/* Access the sysconfig only if the target is ready */
		if (oh->class->sysc) {
			if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
				_update_sysc_cache(oh);
			_sysc_enable(oh);
		}
	} else {
		pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
			 oh->name, r);
	}

929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
	return r;
}

/**
 * _idle - idle an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Idles an omap_hwmod @oh.  This should be called once the hwmod has
 * no further work.  Returns -EINVAL if the hwmod is in the wrong
 * state or returns 0.
 */
static int _idle(struct omap_hwmod *oh)
{
	if (oh->_state != _HWMOD_STATE_ENABLED) {
		WARN(1, "omap_hwmod: %s: idle state can only be entered from "
		     "enabled state\n", oh->name);
		return -EINVAL;
	}

	pr_debug("omap_hwmod: %s: idling\n", oh->name);

950
	if (oh->class->sysc)
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979
		_sysc_idle(oh);
	_del_initiator_dep(oh, mpu_oh);
	_disable_clocks(oh);

	oh->_state = _HWMOD_STATE_IDLE;

	return 0;
}

/**
 * _shutdown - shutdown an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Shut down an omap_hwmod @oh.  This should be called when the driver
 * used for the hwmod is removed or unloaded or if the driver is not
 * used by the system.  Returns -EINVAL if the hwmod is in the wrong
 * state or returns 0.
 */
static int _shutdown(struct omap_hwmod *oh)
{
	if (oh->_state != _HWMOD_STATE_IDLE &&
	    oh->_state != _HWMOD_STATE_ENABLED) {
		WARN(1, "omap_hwmod: %s: disabled state can only be entered "
		     "from idle, or enabled state\n", oh->name);
		return -EINVAL;
	}

	pr_debug("omap_hwmod: %s: disabling\n", oh->name);

980
	if (oh->class->sysc)
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
		_sysc_shutdown(oh);
	_del_initiator_dep(oh, mpu_oh);
	/* XXX what about the other system initiators here? DMA, tesla, d2d */
	_disable_clocks(oh);
	/* XXX Should this code also force-disable the optional clocks? */

	/* XXX mux any associated balls to safe mode */

	oh->_state = _HWMOD_STATE_DISABLED;

	return 0;
}

/**
 * _setup - do initial configuration of omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
 * OCP_SYSCONFIG register.  Must be called with omap_hwmod_mutex
 * held.  Returns -EINVAL if the hwmod is in the wrong state or returns
 * 0.
 */
static int _setup(struct omap_hwmod *oh)
{
1005
	int i, r;
1006 1007 1008 1009 1010 1011

	if (!oh)
		return -EINVAL;

	/* Set iclk autoidle mode */
	if (oh->slaves_cnt > 0) {
1012 1013
		for (i = 0; i < oh->slaves_cnt; i++) {
			struct omap_hwmod_ocp_if *os = oh->slaves[i];
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
			struct clk *c = os->_clk;

			if (!c || IS_ERR(c))
				continue;

			if (os->flags & OCPIF_SWSUP_IDLE) {
				/* XXX omap_iclk_deny_idle(c); */
			} else {
				/* XXX omap_iclk_allow_idle(c); */
				clk_enable(c);
			}
		}
	}

	oh->_state = _HWMOD_STATE_INITIALIZED;

1030 1031 1032 1033 1034 1035
	r = _enable(oh);
	if (r) {
		pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
			   oh->name, oh->_state);
		return 0;
	}
1036

1037 1038 1039 1040 1041 1042 1043 1044
	if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
		/*
		 * XXX Do the OCP_SYSCONFIG bits need to be
		 * reprogrammed after a reset?  If not, then this can
		 * be removed.  If they do, then probably the
		 * _enable() function should be split to avoid the
		 * rewrite of the OCP_SYSCONFIG register.
		 */
1045
		if (oh->class->sysc) {
1046 1047 1048 1049
			_update_sysc_cache(oh);
			_sysc_enable(oh);
		}
	}
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070

	if (!(oh->flags & HWMOD_INIT_NO_IDLE))
		_idle(oh);

	return 0;
}



/* Public functions */

u32 omap_hwmod_readl(struct omap_hwmod *oh, u16 reg_offs)
{
	return __raw_readl(oh->_rt_va + reg_offs);
}

void omap_hwmod_writel(u32 v, struct omap_hwmod *oh, u16 reg_offs)
{
	__raw_writel(v, oh->_rt_va + reg_offs);
}

1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
{
	u32 v;
	int retval = 0;

	if (!oh)
		return -EINVAL;

	v = oh->_sysc_cache;

	retval = _set_slave_idlemode(oh, idlemode, &v);
	if (!retval)
		_write_sysconfig(v, oh);

	return retval;
}

1088 1089 1090 1091
/**
 * omap_hwmod_register - register a struct omap_hwmod
 * @oh: struct omap_hwmod *
 *
1092 1093 1094 1095 1096 1097
 * Registers the omap_hwmod @oh.  Returns -EEXIST if an omap_hwmod
 * already has been registered by the same name; -EINVAL if the
 * omap_hwmod is in the wrong state, if @oh is NULL, if the
 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
 * name, or if the omap_hwmod's class is missing a name; or 0 upon
 * success.
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
 *
 * XXX The data should be copied into bootmem, so the original data
 * should be marked __initdata and freed after init.  This would allow
 * unneeded omap_hwmods to be freed on multi-OMAP configurations.  Note
 * that the copy process would be relatively complex due to the large number
 * of substructures.
 */
int omap_hwmod_register(struct omap_hwmod *oh)
{
	int ret, ms_id;

1109 1110
	if (!oh || !oh->name || !oh->class || !oh->class->name ||
	    (oh->_state != _HWMOD_STATE_UNKNOWN))
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);

	pr_debug("omap_hwmod: %s: registering\n", oh->name);

	if (_lookup(oh->name)) {
		ret = -EEXIST;
		goto ohr_unlock;
	}

	ms_id = _find_mpu_port_index(oh);
	if (!IS_ERR_VALUE(ms_id)) {
		oh->_mpu_port_index = ms_id;
		oh->_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
	} else {
		oh->_int_flags |= _HWMOD_NO_MPU_PORT;
	}

	list_add_tail(&oh->node, &omap_hwmod_list);

	oh->_state = _HWMOD_STATE_REGISTERED;

	ret = 0;

ohr_unlock:
	mutex_unlock(&omap_hwmod_mutex);
	return ret;
}

/**
 * omap_hwmod_lookup - look up a registered omap_hwmod by name
 * @name: name of the omap_hwmod to look up
 *
 * Given a @name of an omap_hwmod, return a pointer to the registered
 * struct omap_hwmod *, or NULL upon error.
 */
struct omap_hwmod *omap_hwmod_lookup(const char *name)
{
	struct omap_hwmod *oh;

	if (!name)
		return NULL;

	mutex_lock(&omap_hwmod_mutex);
	oh = _lookup(name);
	mutex_unlock(&omap_hwmod_mutex);

	return oh;
}

/**
 * omap_hwmod_for_each - call function for each registered omap_hwmod
 * @fn: pointer to a callback function
 *
 * Call @fn for each registered omap_hwmod, passing @data to each
 * function.  @fn must return 0 for success or any other value for
 * failure.  If @fn returns non-zero, the iteration across omap_hwmods
 * will stop and the non-zero return value will be passed to the
 * caller of omap_hwmod_for_each().  @fn is called with
 * omap_hwmod_for_each() held.
 */
int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh))
{
	struct omap_hwmod *temp_oh;
	int ret;

	if (!fn)
		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);
	list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
		ret = (*fn)(temp_oh);
		if (ret)
			break;
	}
	mutex_unlock(&omap_hwmod_mutex);

	return ret;
}


/**
 * omap_hwmod_init - init omap_hwmod code and register hwmods
 * @ohs: pointer to an array of omap_hwmods to register
 *
 * Intended to be called early in boot before the clock framework is
 * initialized.  If @ohs is not null, will register all omap_hwmods
 * listed in @ohs that are valid for this chip.  Returns -EINVAL if
 * omap_hwmod_init() has already been called or 0 otherwise.
 */
int omap_hwmod_init(struct omap_hwmod **ohs)
{
	struct omap_hwmod *oh;
	int r;

	if (inited)
		return -EINVAL;

	inited = 1;

	if (!ohs)
		return 0;

	oh = *ohs;
	while (oh) {
		if (omap_chip_is(oh->omap_chip)) {
			r = omap_hwmod_register(oh);
			WARN(r, "omap_hwmod: %s: omap_hwmod_register returned "
			     "%d\n", oh->name, r);
		}
		oh = *++ohs;
	}

	return 0;
}

/**
 * omap_hwmod_late_init - do some post-clock framework initialization
 *
 * Must be called after omap2_clk_init().  Resolves the struct clk names
 * to struct clk pointers for each registered omap_hwmod.  Also calls
 * _setup() on each hwmod.  Returns 0.
 */
int omap_hwmod_late_init(void)
{
	int r;

	/* XXX check return value */
	r = omap_hwmod_for_each(_init_clocks);
	WARN(r, "omap_hwmod: omap_hwmod_late_init(): _init_clocks failed\n");

	mpu_oh = omap_hwmod_lookup(MPU_INITIATOR_NAME);
	WARN(!mpu_oh, "omap_hwmod: could not find MPU initiator hwmod %s\n",
	     MPU_INITIATOR_NAME);

	omap_hwmod_for_each(_setup);

	return 0;
}

/**
 * omap_hwmod_unregister - unregister an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Unregisters a previously-registered omap_hwmod @oh.  There's probably
 * no use case for this, so it is likely to be removed in a later version.
 *
 * XXX Free all of the bootmem-allocated structures here when that is
 * implemented.  Make it clear that core code is the only code that is
 * expected to unregister modules.
 */
int omap_hwmod_unregister(struct omap_hwmod *oh)
{
	if (!oh)
		return -EINVAL;

	pr_debug("omap_hwmod: %s: unregistering\n", oh->name);

	mutex_lock(&omap_hwmod_mutex);
T
Tony Lindgren 已提交
1271
	iounmap(oh->_rt_va);
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382
	list_del(&oh->node);
	mutex_unlock(&omap_hwmod_mutex);

	return 0;
}

/**
 * omap_hwmod_enable - enable an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Enable an omap_hwomd @oh.  Intended to be called by omap_device_enable().
 * Returns -EINVAL on error or passes along the return value from _enable().
 */
int omap_hwmod_enable(struct omap_hwmod *oh)
{
	int r;

	if (!oh)
		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);
	r = _enable(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return r;
}

/**
 * omap_hwmod_idle - idle an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Idle an omap_hwomd @oh.  Intended to be called by omap_device_idle().
 * Returns -EINVAL on error or passes along the return value from _idle().
 */
int omap_hwmod_idle(struct omap_hwmod *oh)
{
	if (!oh)
		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);
	_idle(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return 0;
}

/**
 * omap_hwmod_shutdown - shutdown an omap_hwmod
 * @oh: struct omap_hwmod *
 *
 * Shutdown an omap_hwomd @oh.  Intended to be called by
 * omap_device_shutdown().  Returns -EINVAL on error or passes along
 * the return value from _shutdown().
 */
int omap_hwmod_shutdown(struct omap_hwmod *oh)
{
	if (!oh)
		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);
	_shutdown(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return 0;
}

/**
 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
 * @oh: struct omap_hwmod *oh
 *
 * Intended to be called by the omap_device code.
 */
int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
{
	mutex_lock(&omap_hwmod_mutex);
	_enable_clocks(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return 0;
}

/**
 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
 * @oh: struct omap_hwmod *oh
 *
 * Intended to be called by the omap_device code.
 */
int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
{
	mutex_lock(&omap_hwmod_mutex);
	_disable_clocks(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return 0;
}

/**
 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
 * @oh: struct omap_hwmod *oh
 *
 * Intended to be called by drivers and core code when all posted
 * writes to a device must complete before continuing further
 * execution (for example, after clearing some device IRQSTATUS
 * register bits)
 *
 * XXX what about targets with multiple OCP threads?
 */
void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
{
	BUG_ON(!oh);

1383
	if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
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		WARN(1, "omap_device: %s: OCP barrier impossible due to "
		      "device configuration\n", oh->name);
		return;
	}

	/*
	 * Forces posted writes to complete on the OCP thread handling
	 * register writes
	 */
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	omap_hwmod_readl(oh, oh->class->sysc->sysc_offs);
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}

/**
 * omap_hwmod_reset - reset the hwmod
 * @oh: struct omap_hwmod *
 *
 * Under some conditions, a driver may wish to reset the entire device.
 * Called from omap_device code.  Returns -EINVAL on error or passes along
 * the return value from _reset()/_enable().
 */
int omap_hwmod_reset(struct omap_hwmod *oh)
{
	int r;

	if (!oh || !(oh->_state & _HWMOD_STATE_ENABLED))
		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);
	r = _reset(oh);
	if (!r)
		r = _enable(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return r;
}

/**
 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
 * @oh: struct omap_hwmod *
 * @res: pointer to the first element of an array of struct resource to fill
 *
 * Count the number of struct resource array elements necessary to
 * contain omap_hwmod @oh resources.  Intended to be called by code
 * that registers omap_devices.  Intended to be used to determine the
 * size of a dynamically-allocated struct resource array, before
 * calling omap_hwmod_fill_resources().  Returns the number of struct
 * resource array elements needed.
 *
 * XXX This code is not optimized.  It could attempt to merge adjacent
 * resource IDs.
 *
 */
int omap_hwmod_count_resources(struct omap_hwmod *oh)
{
	int ret, i;

	ret = oh->mpu_irqs_cnt + oh->sdma_chs_cnt;

	for (i = 0; i < oh->slaves_cnt; i++)
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		ret += oh->slaves[i]->addr_cnt;
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	return ret;
}

/**
 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
 * @oh: struct omap_hwmod *
 * @res: pointer to the first element of an array of struct resource to fill
 *
 * Fill the struct resource array @res with resource data from the
 * omap_hwmod @oh.  Intended to be called by code that registers
 * omap_devices.  See also omap_hwmod_count_resources().  Returns the
 * number of array elements filled.
 */
int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
{
	int i, j;
	int r = 0;

	/* For each IRQ, DMA, memory area, fill in array.*/

	for (i = 0; i < oh->mpu_irqs_cnt; i++) {
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		(res + r)->name = (oh->mpu_irqs + i)->name;
		(res + r)->start = (oh->mpu_irqs + i)->irq;
		(res + r)->end = (oh->mpu_irqs + i)->irq;
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		(res + r)->flags = IORESOURCE_IRQ;
		r++;
	}

	for (i = 0; i < oh->sdma_chs_cnt; i++) {
		(res + r)->name = (oh->sdma_chs + i)->name;
		(res + r)->start = (oh->sdma_chs + i)->dma_ch;
		(res + r)->end = (oh->sdma_chs + i)->dma_ch;
		(res + r)->flags = IORESOURCE_DMA;
		r++;
	}

	for (i = 0; i < oh->slaves_cnt; i++) {
		struct omap_hwmod_ocp_if *os;

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		os = oh->slaves[i];
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		for (j = 0; j < os->addr_cnt; j++) {
			(res + r)->start = (os->addr + j)->pa_start;
			(res + r)->end = (os->addr + j)->pa_end;
			(res + r)->flags = IORESOURCE_MEM;
			r++;
		}
	}

	return r;
}

/**
 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
 * @oh: struct omap_hwmod *
 *
 * Return the powerdomain pointer associated with the OMAP module
 * @oh's main clock.  If @oh does not have a main clk, return the
 * powerdomain associated with the interface clock associated with the
 * module's MPU port. (XXX Perhaps this should use the SDMA port
 * instead?)  Returns NULL on error, or a struct powerdomain * on
 * success.
 */
struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
{
	struct clk *c;

	if (!oh)
		return NULL;

	if (oh->_clk) {
		c = oh->_clk;
	} else {
		if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
			return NULL;
		c = oh->slaves[oh->_mpu_port_index]->_clk;
	}

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	if (!c->clkdm)
		return NULL;

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	return c->clkdm->pwrdm.ptr;

}

/**
 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
 * @oh: struct omap_hwmod *
 * @init_oh: struct omap_hwmod * (initiator)
 *
 * Add a sleep dependency between the initiator @init_oh and @oh.
 * Intended to be called by DSP/Bridge code via platform_data for the
 * DSP case; and by the DMA code in the sDMA case.  DMA code, *Bridge
 * code needs to add/del initiator dependencies dynamically
 * before/after accessing a device.  Returns the return value from
 * _add_initiator_dep().
 *
 * XXX Keep a usecount in the clockdomain code
 */
int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
				 struct omap_hwmod *init_oh)
{
	return _add_initiator_dep(oh, init_oh);
}

/*
 * XXX what about functions for drivers to save/restore ocp_sysconfig
 * for context save/restore operations?
 */

/**
 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
 * @oh: struct omap_hwmod *
 * @init_oh: struct omap_hwmod * (initiator)
 *
 * Remove a sleep dependency between the initiator @init_oh and @oh.
 * Intended to be called by DSP/Bridge code via platform_data for the
 * DSP case; and by the DMA code in the sDMA case.  DMA code, *Bridge
 * code needs to add/del initiator dependencies dynamically
 * before/after accessing a device.  Returns the return value from
 * _del_initiator_dep().
 *
 * XXX Keep a usecount in the clockdomain code
 */
int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
				 struct omap_hwmod *init_oh)
{
	return _del_initiator_dep(oh, init_oh);
}

/**
 * omap_hwmod_enable_wakeup - allow device to wake up the system
 * @oh: struct omap_hwmod *
 *
 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
 * send wakeups to the PRCM.  Eventually this should sets PRCM wakeup
 * registers to cause the PRCM to receive wakeup events from the
 * module.  Does not set any wakeup routing registers beyond this
 * point - if the module is to wake up any other module or subsystem,
 * that must be set separately.  Called by omap_device code.  Returns
 * -EINVAL on error or 0 upon success.
 */
int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
{
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	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);
	_enable_wakeup(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return 0;
}

/**
 * omap_hwmod_disable_wakeup - prevent device from waking the system
 * @oh: struct omap_hwmod *
 *
 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
 * from sending wakeups to the PRCM.  Eventually this should clear
 * PRCM wakeup registers to cause the PRCM to ignore wakeup events
 * from the module.  Does not set any wakeup routing registers beyond
 * this point - if the module is to wake up any other module or
 * subsystem, that must be set separately.  Called by omap_device
 * code.  Returns -EINVAL on error or 0 upon success.
 */
int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
{
1614 1615
	if (!oh->class->sysc ||
	    !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
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		return -EINVAL;

	mutex_lock(&omap_hwmod_mutex);
	_disable_wakeup(oh);
	mutex_unlock(&omap_hwmod_mutex);

	return 0;
}
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/**
 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
 * @classname: struct omap_hwmod_class name to search for
 * @fn: callback function pointer to call for each hwmod in class @classname
 * @user: arbitrary context data to pass to the callback function
 *
 * For each omap_hwmod of class @classname, call @fn.  Takes
 * omap_hwmod_mutex to prevent the hwmod list from changing during the
 * iteration.  If the callback function returns something other than
 * zero, the iterator is terminated, and the callback function's return
 * value is passed back to the caller.  Returns 0 upon success, -EINVAL
 * if @classname or @fn are NULL, or passes back the error code from @fn.
 */
int omap_hwmod_for_each_by_class(const char *classname,
				 int (*fn)(struct omap_hwmod *oh,
					   void *user),
				 void *user)
{
	struct omap_hwmod *temp_oh;
	int ret = 0;

	if (!classname || !fn)
		return -EINVAL;

	pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
		 __func__, classname);

	mutex_lock(&omap_hwmod_mutex);

	list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
		if (!strcmp(temp_oh->class->name, classname)) {
			pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
				 __func__, temp_oh->name);
			ret = (*fn)(temp_oh, user);
			if (ret)
				break;
		}
	}

	mutex_unlock(&omap_hwmod_mutex);

	if (ret)
		pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
			 __func__, ret);

	return ret;
}