[linux-2.6-block.git] / drivers / clk / ti / clkt_iclk.c

/*
 * OMAP2/3 interface clock control
 *
 * Copyright (C) 2011 Nokia Corporation
 * 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/clk-provider.h>
#include <linux/io.h>
#include <linux/clk/ti.h>

#include "clock.h"

/* Register offsets */
#define OMAP24XX_CM_FCLKEN2		0x04
#define CM_AUTOIDLE			0x30
#define CM_ICLKEN			0x10
#define CM_IDLEST			0x20

#define OMAP24XX_CM_IDLEST_VAL		0

/* Private functions */

/* XXX */
void omap2_clkt_iclk_allow_idle(struct clk_hw_omap *clk)
{
	u32 v;
	struct clk_omap_reg r;

	memcpy(&r, &clk->enable_reg, sizeof(r));
	r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);

	v = ti_clk_ll_ops->clk_readl(&r);
	v |= (1 << clk->enable_bit);
	ti_clk_ll_ops->clk_writel(v, &r);
}

/* XXX */
void omap2_clkt_iclk_deny_idle(struct clk_hw_omap *clk)
{
	u32 v;
	struct clk_omap_reg r;

	memcpy(&r, &clk->enable_reg, sizeof(r));

	r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);

	v = ti_clk_ll_ops->clk_readl(&r);
	v &= ~(1 << clk->enable_bit);
	ti_clk_ll_ops->clk_writel(v, &r);
}

/**
 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
 *
 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE.  This custom function
 * passes back the correct CM_IDLEST register address for I2CHS
 * modules.  No return value.
 */
static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk,
					   struct clk_omap_reg *idlest_reg,
					   u8 *idlest_bit,
					   u8 *idlest_val)
{
	memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
	idlest_reg->offset ^= (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST);
	*idlest_bit = clk->enable_bit;
	*idlest_val = OMAP24XX_CM_IDLEST_VAL;
}

/* Public data */

const struct clk_hw_omap_ops clkhwops_iclk = {
	.allow_idle	= omap2_clkt_iclk_allow_idle,
	.deny_idle	= omap2_clkt_iclk_deny_idle,
};

const struct clk_hw_omap_ops clkhwops_iclk_wait = {
	.allow_idle	= omap2_clkt_iclk_allow_idle,
	.deny_idle	= omap2_clkt_iclk_deny_idle,
	.find_idlest	= omap2_clk_dflt_find_idlest,
	.find_companion	= omap2_clk_dflt_find_companion,
};

/* 2430 I2CHS has non-standard IDLEST register */
const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = {
	.find_idlest	= omap2430_clk_i2chs_find_idlest,
	.find_companion	= omap2_clk_dflt_find_companion,
};
Commit	Line	Data
530e544f PW	1	/*
	2	* OMAP2/3 interface clock control
	3	*
	4	* Copyright (C) 2011 Nokia Corporation
	5	* Paul Walmsley
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#undef DEBUG
	12
	13	#include <linux/kernel.h>
32cc0021	14	#include <linux/clk-provider.h>
530e544f	15	#include <linux/io.h>
ef14db09	16	#include <linux/clk/ti.h>
530e544f	17
530e544f	18	#include "clock.h"
acd052bb TK	19
acd052bb TK	20	/* Register offsets */
d5a04ddd	21	#define OMAP24XX_CM_FCLKEN2 0x04
acd052bb TK	22	#define CM_AUTOIDLE 0x30
acd052bb TK	23	#define CM_ICLKEN 0x10
d5a04ddd TK	24	#define CM_IDLEST 0x20
	25
	26	#define OMAP24XX_CM_IDLEST_VAL 0
530e544f PW	27
	28	/* Private functions */
	29
	30	/* XXX */
b4777a21	31	void omap2_clkt_iclk_allow_idle(struct clk_hw_omap *clk)
530e544f	32	{
519ab8b2	33	u32 v;
6c0afb50	34	struct clk_omap_reg r;
530e544f	35
6c0afb50 TK	36	memcpy(&r, &clk->enable_reg, sizeof(r));
6c0afb50 TK	37	r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);
530e544f	38
6c0afb50	39	v = ti_clk_ll_ops->clk_readl(&r);
530e544f	40	v \|= (1 << clk->enable_bit);
6c0afb50	41	ti_clk_ll_ops->clk_writel(v, &r);
530e544f PW	42	}
	43
	44	/* XXX */
b4777a21	45	void omap2_clkt_iclk_deny_idle(struct clk_hw_omap *clk)
530e544f	46	{
519ab8b2	47	u32 v;
6c0afb50	48	struct clk_omap_reg r;
530e544f	49
6c0afb50	50	memcpy(&r, &clk->enable_reg, sizeof(r));
530e544f	51
6c0afb50 TK	52	r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);
	53
	54	v = ti_clk_ll_ops->clk_readl(&r);
530e544f	55	v &= ~(1 << clk->enable_bit);
6c0afb50	56	ti_clk_ll_ops->clk_writel(v, &r);
530e544f PW	57	}
530e544f PW	58
d5a04ddd TK	59	/**
	60	* omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
	61	* @clk: struct clk * being enabled
	62	* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
	63	* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
	64	* @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
	65	*
	66	* OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
	67	* CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function
	68	* passes back the correct CM_IDLEST register address for I2CHS
	69	* modules. No return value.
	70	*/
	71	static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk,
6c0afb50	72	struct clk_omap_reg *idlest_reg,
d5a04ddd TK	73	u8 *idlest_bit,
	74	u8 *idlest_val)
	75	{
6c0afb50 TK	76	memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
6c0afb50 TK	77	idlest_reg->offset ^= (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST);
d5a04ddd TK	78	*idlest_bit = clk->enable_bit;
	79	*idlest_val = OMAP24XX_CM_IDLEST_VAL;
	80	}
	81
530e544f PW	82	/* Public data */
530e544f PW	83
b4777a21 RN	84	const struct clk_hw_omap_ops clkhwops_iclk = {
	85	.allow_idle = omap2_clkt_iclk_allow_idle,
	86	.deny_idle = omap2_clkt_iclk_deny_idle,
	87	};
	88
32cc0021 MT	89	const struct clk_hw_omap_ops clkhwops_iclk_wait = {
	90	.allow_idle = omap2_clkt_iclk_allow_idle,
	91	.deny_idle = omap2_clkt_iclk_deny_idle,
	92	.find_idlest = omap2_clk_dflt_find_idlest,
	93	.find_companion = omap2_clk_dflt_find_companion,
	94	};
d5a04ddd TK	95
	96	/* 2430 I2CHS has non-standard IDLEST register */
	97	const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = {
	98	.find_idlest = omap2430_clk_i2chs_find_idlest,
	99	.find_companion = omap2_clk_dflt_find_companion,
	100	};