mirror of https://gitee.com/openkylin/linux.git
101 lines
2.6 KiB
C
101 lines
2.6 KiB
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,
|
|
};
|