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/*
* 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,
};
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