[deliverable/linux.git] / arch / arm / mach-omap2 / cm33xx.c

/*
 * AM33XX CM functions
 *
 * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
 * Vaibhav Hiremath <hvaibhav@ti.com>
 *
 * Reference taken from from OMAP4 cminst44xx.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/io.h>

#include "clockdomain.h"
#include "cm.h"
#include "cm33xx.h"
#include "cm-regbits-34xx.h"
#include "cm-regbits-33xx.h"
#include "prm33xx.h"

/*
 * CLKCTRL_IDLEST_*: possible values for the CM_*_CLKCTRL.IDLEST bitfield:
 *
 *   0x0 func:     Module is fully functional, including OCP
 *   0x1 trans:    Module is performing transition: wakeup, or sleep, or sleep
 *                 abortion
 *   0x2 idle:     Module is in Idle mode (only OCP part). It is functional if
 *                 using separate functional clock
 *   0x3 disabled: Module is disabled and cannot be accessed
 *
 */
#define CLKCTRL_IDLEST_FUNCTIONAL		0x0
#define CLKCTRL_IDLEST_INTRANSITION		0x1
#define CLKCTRL_IDLEST_INTERFACE_IDLE		0x2
#define CLKCTRL_IDLEST_DISABLED			0x3

/* Private functions */

/* Read a register in a CM instance */
static inline u32 am33xx_cm_read_reg(u16 inst, u16 idx)
{
	return readl_relaxed(cm_base + inst + idx);
}

/* Write into a register in a CM */
static inline void am33xx_cm_write_reg(u32 val, u16 inst, u16 idx)
{
	writel_relaxed(val, cm_base + inst + idx);
}

/* Read-modify-write a register in CM */
static inline u32 am33xx_cm_rmw_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx)
{
	u32 v;

	v = am33xx_cm_read_reg(inst, idx);
	v &= ~mask;
	v |= bits;
	am33xx_cm_write_reg(v, inst, idx);

	return v;
}

/**
 * _clkctrl_idlest - read a CM_*_CLKCTRL register; mask & shift IDLEST bitfield
 * @inst: CM instance register offset (*_INST macro)
 * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 *
 * Return the IDLEST bitfield of a CM_*_CLKCTRL register, shifted down to
 * bit 0.
 */
static u32 _clkctrl_idlest(u16 inst, u16 clkctrl_offs)
{
	u32 v = am33xx_cm_read_reg(inst, clkctrl_offs);
	v &= AM33XX_IDLEST_MASK;
	v >>= AM33XX_IDLEST_SHIFT;
	return v;
}

/**
 * _is_module_ready - can module registers be accessed without causing an abort?
 * @inst: CM instance register offset (*_INST macro)
 * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 *
 * Returns true if the module's CM_*_CLKCTRL.IDLEST bitfield is either
 * *FUNCTIONAL or *INTERFACE_IDLE; false otherwise.
 */
static bool _is_module_ready(u16 inst, u16 clkctrl_offs)
{
	u32 v;

	v = _clkctrl_idlest(inst, clkctrl_offs);

	return (v == CLKCTRL_IDLEST_FUNCTIONAL ||
		v == CLKCTRL_IDLEST_INTERFACE_IDLE) ? true : false;
}

/**
 * _clktrctrl_write - write @c to a CM_CLKSTCTRL.CLKTRCTRL register bitfield
 * @c: CLKTRCTRL register bitfield (LSB = bit 0, i.e., unshifted)
 * @inst: CM instance register offset (*_INST macro)
 * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 *
 * @c must be the unshifted value for CLKTRCTRL - i.e., this function
 * will handle the shift itself.
 */
static void _clktrctrl_write(u8 c, u16 inst, u16 cdoffs)
{
	u32 v;

	v = am33xx_cm_read_reg(inst, cdoffs);
	v &= ~AM33XX_CLKTRCTRL_MASK;
	v |= c << AM33XX_CLKTRCTRL_SHIFT;
	am33xx_cm_write_reg(v, inst, cdoffs);
}

/* Public functions */

/**
 * am33xx_cm_is_clkdm_in_hwsup - is a clockdomain in hwsup idle mode?
 * @inst: CM instance register offset (*_INST macro)
 * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 *
 * Returns true if the clockdomain referred to by (@inst, @cdoffs)
 * is in hardware-supervised idle mode, or 0 otherwise.
 */
static bool am33xx_cm_is_clkdm_in_hwsup(u16 inst, u16 cdoffs)
{
	u32 v;

	v = am33xx_cm_read_reg(inst, cdoffs);
	v &= AM33XX_CLKTRCTRL_MASK;
	v >>= AM33XX_CLKTRCTRL_SHIFT;

	return (v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ? true : false;
}

/**
 * am33xx_cm_clkdm_enable_hwsup - put a clockdomain in hwsup-idle mode
 * @inst: CM instance register offset (*_INST macro)
 * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 *
 * Put a clockdomain referred to by (@inst, @cdoffs) into
 * hardware-supervised idle mode.  No return value.
 */
static void am33xx_cm_clkdm_enable_hwsup(u16 inst, u16 cdoffs)
{
	_clktrctrl_write(OMAP34XX_CLKSTCTRL_ENABLE_AUTO, inst, cdoffs);
}

/**
 * am33xx_cm_clkdm_disable_hwsup - put a clockdomain in swsup-idle mode
 * @inst: CM instance register offset (*_INST macro)
 * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 *
 * Put a clockdomain referred to by (@inst, @cdoffs) into
 * software-supervised idle mode, i.e., controlled manually by the
 * Linux OMAP clockdomain code.  No return value.
 */
static void am33xx_cm_clkdm_disable_hwsup(u16 inst, u16 cdoffs)
{
	_clktrctrl_write(OMAP34XX_CLKSTCTRL_DISABLE_AUTO, inst, cdoffs);
}

/**
 * am33xx_cm_clkdm_force_sleep - try to put a clockdomain into idle
 * @inst: CM instance register offset (*_INST macro)
 * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 *
 * Put a clockdomain referred to by (@inst, @cdoffs) into idle
 * No return value.
 */
static void am33xx_cm_clkdm_force_sleep(u16 inst, u16 cdoffs)
{
	_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_SLEEP, inst, cdoffs);
}

/**
 * am33xx_cm_clkdm_force_wakeup - try to take a clockdomain out of idle
 * @inst: CM instance register offset (*_INST macro)
 * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 *
 * Take a clockdomain referred to by (@inst, @cdoffs) out of idle,
 * waking it up.  No return value.
 */
static void am33xx_cm_clkdm_force_wakeup(u16 inst, u16 cdoffs)
{
	_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_WAKEUP, inst, cdoffs);
}

/*
 *
 */

/**
 * am33xx_cm_wait_module_ready - wait for a module to be in 'func' state
 * @part: PRCM partition, ignored for AM33xx
 * @inst: CM instance register offset (*_INST macro)
 * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 * @bit_shift: bit shift for the register, ignored for AM33xx
 *
 * Wait for the module IDLEST to be functional. If the idle state is in any
 * the non functional state (trans, idle or disabled), module and thus the
 * sysconfig cannot be accessed and will probably lead to an "imprecise
 * external abort"
 */
static int am33xx_cm_wait_module_ready(u8 part, s16 inst, u16 clkctrl_offs,
				       u8 bit_shift)
{
	int i = 0;

	if (!clkctrl_offs)
		return 0;

	omap_test_timeout(_is_module_ready(inst, clkctrl_offs),
			  MAX_MODULE_READY_TIME, i);

	return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
}

/**
 * am33xx_cm_wait_module_idle - wait for a module to be in 'disabled'
 * state
 * @part: CM partition, ignored for AM33xx
 * @inst: CM instance register offset (*_INST macro)
 * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 * @bit_shift: bit shift for the register, ignored for AM33xx
 *
 * Wait for the module IDLEST to be disabled. Some PRCM transition,
 * like reset assertion or parent clock de-activation must wait the
 * module to be fully disabled.
 */
static int am33xx_cm_wait_module_idle(u8 part, s16 inst, u16 clkctrl_offs,
				      u8 bit_shift)
{
	int i = 0;

	if (!clkctrl_offs)
		return 0;

	omap_test_timeout((_clkctrl_idlest(inst, clkctrl_offs) ==
				CLKCTRL_IDLEST_DISABLED),
				MAX_MODULE_READY_TIME, i);

	return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
}

/**
 * am33xx_cm_module_enable - Enable the modulemode inside CLKCTRL
 * @mode: Module mode (SW or HW)
 * @part: CM partition, ignored for AM33xx
 * @inst: CM instance register offset (*_INST macro)
 * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 *
 * No return value.
 */
static void am33xx_cm_module_enable(u8 mode, u8 part, u16 inst,
				    u16 clkctrl_offs)
{
	u32 v;

	v = am33xx_cm_read_reg(inst, clkctrl_offs);
	v &= ~AM33XX_MODULEMODE_MASK;
	v |= mode << AM33XX_MODULEMODE_SHIFT;
	am33xx_cm_write_reg(v, inst, clkctrl_offs);
}

/**
 * am33xx_cm_module_disable - Disable the module inside CLKCTRL
 * @part: CM partition, ignored for AM33xx
 * @inst: CM instance register offset (*_INST macro)
 * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 *
 * No return value.
 */
static void am33xx_cm_module_disable(u8 part, u16 inst, u16 clkctrl_offs)
{
	u32 v;

	v = am33xx_cm_read_reg(inst, clkctrl_offs);
	v &= ~AM33XX_MODULEMODE_MASK;
	am33xx_cm_write_reg(v, inst, clkctrl_offs);
}

/*
 * Clockdomain low-level functions
 */

static int am33xx_clkdm_sleep(struct clockdomain *clkdm)
{
	am33xx_cm_clkdm_force_sleep(clkdm->cm_inst, clkdm->clkdm_offs);
	return 0;
}

static int am33xx_clkdm_wakeup(struct clockdomain *clkdm)
{
	am33xx_cm_clkdm_force_wakeup(clkdm->cm_inst, clkdm->clkdm_offs);
	return 0;
}

static void am33xx_clkdm_allow_idle(struct clockdomain *clkdm)
{
	am33xx_cm_clkdm_enable_hwsup(clkdm->cm_inst, clkdm->clkdm_offs);
}

static void am33xx_clkdm_deny_idle(struct clockdomain *clkdm)
{
	am33xx_cm_clkdm_disable_hwsup(clkdm->cm_inst, clkdm->clkdm_offs);
}

static int am33xx_clkdm_clk_enable(struct clockdomain *clkdm)
{
	if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
		return am33xx_clkdm_wakeup(clkdm);

	return 0;
}

static int am33xx_clkdm_clk_disable(struct clockdomain *clkdm)
{
	bool hwsup = false;

	hwsup = am33xx_cm_is_clkdm_in_hwsup(clkdm->cm_inst, clkdm->clkdm_offs);

	if (!hwsup && (clkdm->flags & CLKDM_CAN_FORCE_SLEEP))
		am33xx_clkdm_sleep(clkdm);

	return 0;
}

struct clkdm_ops am33xx_clkdm_operations = {
	.clkdm_sleep		= am33xx_clkdm_sleep,
	.clkdm_wakeup		= am33xx_clkdm_wakeup,
	.clkdm_allow_idle	= am33xx_clkdm_allow_idle,
	.clkdm_deny_idle	= am33xx_clkdm_deny_idle,
	.clkdm_clk_enable	= am33xx_clkdm_clk_enable,
	.clkdm_clk_disable	= am33xx_clkdm_clk_disable,
};

static struct cm_ll_data am33xx_cm_ll_data = {
	.wait_module_ready	= &am33xx_cm_wait_module_ready,
	.wait_module_idle	= &am33xx_cm_wait_module_idle,
	.module_enable		= &am33xx_cm_module_enable,
	.module_disable		= &am33xx_cm_module_disable,
};

int __init am33xx_cm_init(const struct omap_prcm_init_data *data)
{
	return cm_register(&am33xx_cm_ll_data);
}

static void __exit am33xx_cm_exit(void)
{
	cm_unregister(&am33xx_cm_ll_data);
}
__exitcall(am33xx_cm_exit);
Commit	Line	Data
f969a6dc VH	1	/*
	2	* AM33XX CM functions
	3	*
	4	* Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
	5	* Vaibhav Hiremath <hvaibhav@ti.com>
	6	*
	7	* Reference taken from from OMAP4 cminst44xx.c
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License as
	11	* published by the Free Software Foundation version 2.
	12	*
	13	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	14	* kind, whether express or implied; without even the implied warranty
	15	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*/
	18
	19	#include <linux/kernel.h>
	20	#include <linux/types.h>
	21	#include <linux/errno.h>
	22	#include <linux/err.h>
	23	#include <linux/io.h>
	24
4bd5259e	25	#include "clockdomain.h"
f969a6dc VH	26	#include "cm.h"
	27	#include "cm33xx.h"
	28	#include "cm-regbits-34xx.h"
	29	#include "cm-regbits-33xx.h"
	30	#include "prm33xx.h"
	31
	32	/*
	33	* CLKCTRL_IDLEST_: possible values for the CM__CLKCTRL.IDLEST bitfield:
	34	*
	35	* 0x0 func: Module is fully functional, including OCP
	36	* 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep
	37	* abortion
	38	* 0x2 idle: Module is in Idle mode (only OCP part). It is functional if
	39	* using separate functional clock
	40	* 0x3 disabled: Module is disabled and cannot be accessed
	41	*
	42	*/
	43	#define CLKCTRL_IDLEST_FUNCTIONAL 0x0
	44	#define CLKCTRL_IDLEST_INTRANSITION 0x1
	45	#define CLKCTRL_IDLEST_INTERFACE_IDLE 0x2
	46	#define CLKCTRL_IDLEST_DISABLED 0x3
	47
	48	/* Private functions */
	49
	50	/* Read a register in a CM instance */
d3f5d551	51	static inline u32 am33xx_cm_read_reg(u16 inst, u16 idx)
f969a6dc	52	{
edfaf05c	53	return readl_relaxed(cm_base + inst + idx);
f969a6dc VH	54	}
	55
	56	/* Write into a register in a CM */
d3f5d551	57	static inline void am33xx_cm_write_reg(u32 val, u16 inst, u16 idx)
f969a6dc	58	{
edfaf05c	59	writel_relaxed(val, cm_base + inst + idx);
f969a6dc VH	60	}
	61
	62	/* Read-modify-write a register in CM */
	63	static inline u32 am33xx_cm_rmw_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx)
	64	{
	65	u32 v;
	66
	67	v = am33xx_cm_read_reg(inst, idx);
	68	v &= ~mask;
	69	v \|= bits;
	70	am33xx_cm_write_reg(v, inst, idx);
	71
	72	return v;
	73	}
	74
f969a6dc VH	75	/**
	76	* _clkctrl_idlest - read a CM_*_CLKCTRL register; mask & shift IDLEST bitfield
	77	* @inst: CM instance register offset (*_INST macro)
f969a6dc VH	78	* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
	79	*
	80	* Return the IDLEST bitfield of a CM_*_CLKCTRL register, shifted down to
	81	* bit 0.
	82	*/
9907f85e	83	static u32 _clkctrl_idlest(u16 inst, u16 clkctrl_offs)
f969a6dc VH	84	{
	85	u32 v = am33xx_cm_read_reg(inst, clkctrl_offs);
	86	v &= AM33XX_IDLEST_MASK;
	87	v >>= AM33XX_IDLEST_SHIFT;
	88	return v;
	89	}
	90
	91	/**
	92	* _is_module_ready - can module registers be accessed without causing an abort?
	93	* @inst: CM instance register offset (*_INST macro)
f969a6dc VH	94	* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
	95	*
	96	* Returns true if the module's CM_*_CLKCTRL.IDLEST bitfield is either
	97	* FUNCTIONAL or INTERFACE_IDLE; false otherwise.
	98	*/
9907f85e	99	static bool _is_module_ready(u16 inst, u16 clkctrl_offs)
f969a6dc VH	100	{
	101	u32 v;
	102
9907f85e	103	v = _clkctrl_idlest(inst, clkctrl_offs);
f969a6dc VH	104
	105	return (v == CLKCTRL_IDLEST_FUNCTIONAL \|\|
	106	v == CLKCTRL_IDLEST_INTERFACE_IDLE) ? true : false;
	107	}
	108
	109	/**
	110	* _clktrctrl_write - write @c to a CM_CLKSTCTRL.CLKTRCTRL register bitfield
	111	* @c: CLKTRCTRL register bitfield (LSB = bit 0, i.e., unshifted)
	112	* @inst: CM instance register offset (*_INST macro)
	113	* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
	114	*
	115	* @c must be the unshifted value for CLKTRCTRL - i.e., this function
	116	* will handle the shift itself.
	117	*/
d3f5d551	118	static void _clktrctrl_write(u8 c, u16 inst, u16 cdoffs)
f969a6dc VH	119	{
	120	u32 v;
	121
	122	v = am33xx_cm_read_reg(inst, cdoffs);
	123	v &= ~AM33XX_CLKTRCTRL_MASK;
	124	v \|= c << AM33XX_CLKTRCTRL_SHIFT;
	125	am33xx_cm_write_reg(v, inst, cdoffs);
	126	}
	127
	128	/* Public functions */
	129
	130	/**
	131	* am33xx_cm_is_clkdm_in_hwsup - is a clockdomain in hwsup idle mode?
	132	* @inst: CM instance register offset (*_INST macro)
	133	* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
	134	*
	135	* Returns true if the clockdomain referred to by (@inst, @cdoffs)
	136	* is in hardware-supervised idle mode, or 0 otherwise.
	137	*/
f2650d6e	138	static bool am33xx_cm_is_clkdm_in_hwsup(u16 inst, u16 cdoffs)
f969a6dc VH	139	{
	140	u32 v;
	141
	142	v = am33xx_cm_read_reg(inst, cdoffs);
	143	v &= AM33XX_CLKTRCTRL_MASK;
	144	v >>= AM33XX_CLKTRCTRL_SHIFT;
	145
	146	return (v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ? true : false;
	147	}
	148
	149	/**
	150	* am33xx_cm_clkdm_enable_hwsup - put a clockdomain in hwsup-idle mode
	151	* @inst: CM instance register offset (*_INST macro)
	152	* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
	153	*
	154	* Put a clockdomain referred to by (@inst, @cdoffs) into
	155	* hardware-supervised idle mode. No return value.
	156	*/
f2650d6e	157	static void am33xx_cm_clkdm_enable_hwsup(u16 inst, u16 cdoffs)
f969a6dc VH	158	{
	159	_clktrctrl_write(OMAP34XX_CLKSTCTRL_ENABLE_AUTO, inst, cdoffs);
	160	}
	161
	162	/**
	163	* am33xx_cm_clkdm_disable_hwsup - put a clockdomain in swsup-idle mode
	164	* @inst: CM instance register offset (*_INST macro)
	165	* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
	166	*
	167	* Put a clockdomain referred to by (@inst, @cdoffs) into
	168	* software-supervised idle mode, i.e., controlled manually by the
	169	* Linux OMAP clockdomain code. No return value.
	170	*/
f2650d6e	171	static void am33xx_cm_clkdm_disable_hwsup(u16 inst, u16 cdoffs)
f969a6dc VH	172	{
	173	_clktrctrl_write(OMAP34XX_CLKSTCTRL_DISABLE_AUTO, inst, cdoffs);
	174	}
	175
	176	/**
	177	* am33xx_cm_clkdm_force_sleep - try to put a clockdomain into idle
	178	* @inst: CM instance register offset (*_INST macro)
	179	* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
	180	*
	181	* Put a clockdomain referred to by (@inst, @cdoffs) into idle
	182	* No return value.
	183	*/
f2650d6e	184	static void am33xx_cm_clkdm_force_sleep(u16 inst, u16 cdoffs)
f969a6dc VH	185	{
	186	_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_SLEEP, inst, cdoffs);
	187	}
	188
	189	/**
	190	* am33xx_cm_clkdm_force_wakeup - try to take a clockdomain out of idle
	191	* @inst: CM instance register offset (*_INST macro)
	192	* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
	193	*
	194	* Take a clockdomain referred to by (@inst, @cdoffs) out of idle,
	195	* waking it up. No return value.
	196	*/
f2650d6e	197	static void am33xx_cm_clkdm_force_wakeup(u16 inst, u16 cdoffs)
f969a6dc VH	198	{
	199	_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_WAKEUP, inst, cdoffs);
	200	}
	201
	202	/*
	203	*
	204	*/
	205
	206	/**
	207	* am33xx_cm_wait_module_ready - wait for a module to be in 'func' state
021b6ff0	208	* @part: PRCM partition, ignored for AM33xx
f969a6dc	209	* @inst: CM instance register offset (*_INST macro)
f969a6dc	210	* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
021b6ff0	211	* @bit_shift: bit shift for the register, ignored for AM33xx
f969a6dc VH	212	*
	213	* Wait for the module IDLEST to be functional. If the idle state is in any
	214	* the non functional state (trans, idle or disabled), module and thus the
	215	* sysconfig cannot be accessed and will probably lead to an "imprecise
	216	* external abort"
	217	*/
021b6ff0 TK	218	static int am33xx_cm_wait_module_ready(u8 part, s16 inst, u16 clkctrl_offs,
021b6ff0 TK	219	u8 bit_shift)
f969a6dc VH	220	{
	221	int i = 0;
	222
183e2077 TK	223	if (!clkctrl_offs)
	224	return 0;
	225
9907f85e	226	omap_test_timeout(_is_module_ready(inst, clkctrl_offs),
f969a6dc VH	227	MAX_MODULE_READY_TIME, i);
	228
	229	return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
	230	}
	231
	232	/**
	233	* am33xx_cm_wait_module_idle - wait for a module to be in 'disabled'
	234	* state
a8ae5afa	235	* @part: CM partition, ignored for AM33xx
f969a6dc	236	* @inst: CM instance register offset (*_INST macro)
f969a6dc	237	* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
a8ae5afa	238	* @bit_shift: bit shift for the register, ignored for AM33xx
f969a6dc VH	239	*
	240	* Wait for the module IDLEST to be disabled. Some PRCM transition,
	241	* like reset assertion or parent clock de-activation must wait the
	242	* module to be fully disabled.
	243	*/
a8ae5afa TK	244	static int am33xx_cm_wait_module_idle(u8 part, s16 inst, u16 clkctrl_offs,
a8ae5afa TK	245	u8 bit_shift)
f969a6dc VH	246	{
	247	int i = 0;
	248
	249	if (!clkctrl_offs)
	250	return 0;
	251
9907f85e	252	omap_test_timeout((_clkctrl_idlest(inst, clkctrl_offs) ==
f969a6dc VH	253	CLKCTRL_IDLEST_DISABLED),
	254	MAX_MODULE_READY_TIME, i);
	255
	256	return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
	257	}
	258
	259	/**
	260	* am33xx_cm_module_enable - Enable the modulemode inside CLKCTRL
	261	* @mode: Module mode (SW or HW)
128603f0	262	* @part: CM partition, ignored for AM33xx
f969a6dc	263	* @inst: CM instance register offset (*_INST macro)
f969a6dc VH	264	* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
	265	*
	266	* No return value.
	267	*/
128603f0 TK	268	static void am33xx_cm_module_enable(u8 mode, u8 part, u16 inst,
128603f0 TK	269	u16 clkctrl_offs)
f969a6dc VH	270	{
	271	u32 v;
	272
	273	v = am33xx_cm_read_reg(inst, clkctrl_offs);
	274	v &= ~AM33XX_MODULEMODE_MASK;
	275	v \|= mode << AM33XX_MODULEMODE_SHIFT;
	276	am33xx_cm_write_reg(v, inst, clkctrl_offs);
	277	}
	278
	279	/**
	280	* am33xx_cm_module_disable - Disable the module inside CLKCTRL
128603f0	281	* @part: CM partition, ignored for AM33xx
f969a6dc	282	* @inst: CM instance register offset (*_INST macro)
f969a6dc VH	283	* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
	284	*
	285	* No return value.
	286	*/
128603f0	287	static void am33xx_cm_module_disable(u8 part, u16 inst, u16 clkctrl_offs)
f969a6dc VH	288	{
	289	u32 v;
	290
	291	v = am33xx_cm_read_reg(inst, clkctrl_offs);
	292	v &= ~AM33XX_MODULEMODE_MASK;
	293	am33xx_cm_write_reg(v, inst, clkctrl_offs);
	294	}
4bd5259e PW	295
	296	/*
	297	* Clockdomain low-level functions
	298	*/
	299
	300	static int am33xx_clkdm_sleep(struct clockdomain *clkdm)
	301	{
	302	am33xx_cm_clkdm_force_sleep(clkdm->cm_inst, clkdm->clkdm_offs);
	303	return 0;
	304	}
	305
	306	static int am33xx_clkdm_wakeup(struct clockdomain *clkdm)
	307	{
	308	am33xx_cm_clkdm_force_wakeup(clkdm->cm_inst, clkdm->clkdm_offs);
	309	return 0;
	310	}
	311
	312	static void am33xx_clkdm_allow_idle(struct clockdomain *clkdm)
	313	{
	314	am33xx_cm_clkdm_enable_hwsup(clkdm->cm_inst, clkdm->clkdm_offs);
	315	}
	316
	317	static void am33xx_clkdm_deny_idle(struct clockdomain *clkdm)
	318	{
	319	am33xx_cm_clkdm_disable_hwsup(clkdm->cm_inst, clkdm->clkdm_offs);
	320	}
	321
	322	static int am33xx_clkdm_clk_enable(struct clockdomain *clkdm)
	323	{
	324	if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
	325	return am33xx_clkdm_wakeup(clkdm);
	326
	327	return 0;
	328	}
	329
	330	static int am33xx_clkdm_clk_disable(struct clockdomain *clkdm)
	331	{
	332	bool hwsup = false;
	333
	334	hwsup = am33xx_cm_is_clkdm_in_hwsup(clkdm->cm_inst, clkdm->clkdm_offs);
	335
	336	if (!hwsup && (clkdm->flags & CLKDM_CAN_FORCE_SLEEP))
	337	am33xx_clkdm_sleep(clkdm);
	338
	339	return 0;
	340	}
	341
	342	struct clkdm_ops am33xx_clkdm_operations = {
	343	.clkdm_sleep = am33xx_clkdm_sleep,
	344	.clkdm_wakeup = am33xx_clkdm_wakeup,
	345	.clkdm_allow_idle = am33xx_clkdm_allow_idle,
	346	.clkdm_deny_idle = am33xx_clkdm_deny_idle,
	347	.clkdm_clk_enable = am33xx_clkdm_clk_enable,
	348	.clkdm_clk_disable = am33xx_clkdm_clk_disable,
	349	};
7632a02f	350
021b6ff0 TK	351	static struct cm_ll_data am33xx_cm_ll_data = {
021b6ff0 TK	352	.wait_module_ready = &am33xx_cm_wait_module_ready,
a8ae5afa	353	.wait_module_idle = &am33xx_cm_wait_module_idle,
128603f0 TK	354	.module_enable = &am33xx_cm_module_enable,
128603f0 TK	355	.module_disable = &am33xx_cm_module_disable,
021b6ff0	356	};
7632a02f	357
425dc8b2	358	int __init am33xx_cm_init(const struct omap_prcm_init_data *data)
7632a02f TK	359	{
	360	return cm_register(&am33xx_cm_ll_data);
	361	}
	362
	363	static void __exit am33xx_cm_exit(void)
	364	{
	365	cm_unregister(&am33xx_cm_ll_data);
	366	}
	367	__exitcall(am33xx_cm_exit);