linux-imx

/*

 * Marvell PXA3xxx family clocks

 *

 * Copyright (C) 2014 Robert Jarzmik

 *

 * Heavily inspired from former arch/arm/mach-pxa/pxa3xx.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 of the License.

 *

 * For non-devicetree platforms. Once pxa is fully converted to devicetree, this

 * should go away.

 */

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/clk-provider.h>

#include <linux/clkdev.h>

#include <linux/of.h>

#include <mach/smemc.h>

#include <mach/pxa3xx-regs.h>

​

#include <dt-bindings/clock/pxa-clock.h>

#include "clk-pxa.h"

​

#define KHz 1000

#define MHz (1000 * 1000)

​

enum {

    PXA_CORE_60Mhz = 0,

    PXA_CORE_RUN,

    PXA_CORE_TURBO,

};

​

enum {

    PXA_BUS_60Mhz = 0,

    PXA_BUS_HSS,

};

​

/* crystal frequency to HSIO bus frequency multiplier (HSS) */

static unsigned char hss_mult[4] = { 8, 12, 16, 24 };

​

/* crystal frequency to static memory controller multiplier (SMCFS) */

static unsigned int smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };

static unsigned int df_clkdiv[4] = { 1, 2, 4, 1 };

​

static const char * const get_freq_khz[] = {

    "core", "ring_osc_60mhz", "run", "cpll", "system_bus"

};

​

/*

 * Get the clock frequency as reflected by ACSR and the turbo flag.

 * We assume these values have been applied via a fcs.

 * If info is not 0 we also display the current settings.

 */

unsigned int pxa3xx_get_clk_frequency_khz(int info)

{

    struct clk *clk;

    unsigned long clks[5];

    int i;

​

    for (i = 0; i < 5; i++) {

        clk = clk_get(NULL, get_freq_khz[i]);