linux-imx

/*

 * OMAP4-specific DPLL control functions

 *

 * Copyright (C) 2011 Texas Instruments, Inc.

 * Rajendra Nayak

 *

 * 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.

 */

​

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/clk.h>

#include <linux/io.h>

#include <linux/bitops.h>

#include <linux/clk/ti.h>

​

#include "clock.h"

​

/*

 * Maximum DPLL input frequency (FINT) and output frequency (FOUT) that

 * can supported when using the DPLL low-power mode. Frequencies are

 * defined in OMAP4430/60 Public TRM section 3.6.3.3.2 "Enable Control,

 * Status, and Low-Power Operation Mode".

 */

#define OMAP4_DPLL_LP_FINT_MAX  1000000

#define OMAP4_DPLL_LP_FOUT_MAX  100000000

​

/*

 * Bitfield declarations

 */

#define OMAP4430_DPLL_CLKOUT_GATE_CTRL_MASK     BIT(8)

#define OMAP4430_DPLL_CLKOUTX2_GATE_CTRL_MASK       BIT(10)

#define OMAP4430_DPLL_REGM4XEN_MASK         BIT(11)

​

/* Static rate multiplier for OMAP4 REGM4XEN clocks */

#define OMAP4430_REGM4XEN_MULT              4

​

static void omap4_dpllmx_allow_gatectrl(struct clk_hw_omap *clk)

{

    u32 v;

    u32 mask;

​

    if (!clk)

        return;

​

    mask = clk->flags & CLOCK_CLKOUTX2 ?

            OMAP4430_DPLL_CLKOUTX2_GATE_CTRL_MASK :

            OMAP4430_DPLL_CLKOUT_GATE_CTRL_MASK;

​

    v = ti_clk_ll_ops->clk_readl(&clk->clksel_reg);

    /* Clear the bit to allow gatectrl */

    v &= ~mask;

    ti_clk_ll_ops->clk_writel(v, &clk->clksel_reg);

}

​

static void omap4_dpllmx_deny_gatectrl(struct clk_hw_omap *clk)

{

    u32 v;

    u32 mask;

​

    if (!clk)