linux-imx

/*

 * Copyright (C) 2014 STMicroelectronics R&D Ltd

 *

 * 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.

 *

 */

​

/*

 * Authors:

 * Stephen Gallimore <stephen.gallimore@st.com>,

 * Pankaj Dev <pankaj.dev@st.com>.

 */

​

#include <linux/slab.h>

#include <linux/of_address.h>

#include <linux/clk.h>

#include <linux/clk-provider.h>

​

#include "clkgen.h"

​

/*

 * Maximum input clock to the PLL before we divide it down by 2

 * although in reality in actual systems this has never been seen to

 * be used.

 */

#define QUADFS_NDIV_THRESHOLD 30000000

​

#define PLL_BW_GOODREF   (0L)

#define PLL_BW_VBADREF   (1L)

#define PLL_BW_BADREF    (2L)

#define PLL_BW_VGOODREF  (3L)

​

#define QUADFS_MAX_CHAN 4

​

struct stm_fs {

    unsigned long ndiv;

    unsigned long mdiv;

    unsigned long pe;

    unsigned long sdiv;

    unsigned long nsdiv;

};

​

struct clkgen_quadfs_data {

    bool reset_present;

    bool bwfilter_present;

    bool lockstatus_present;

    bool powerup_polarity;

    bool standby_polarity;

    bool nsdiv_present;

    bool nrst_present;

    struct clkgen_field ndiv;

    struct clkgen_field ref_bw;

    struct clkgen_field nreset;

    struct clkgen_field npda;

    struct clkgen_field lock_status;

​

    struct clkgen_field nrst[QUADFS_MAX_CHAN];

    struct clkgen_field nsb[QUADFS_MAX_CHAN];

    struct clkgen_field en[QUADFS_MAX_CHAN];

    struct clkgen_field mdiv[QUADFS_MAX_CHAN];

    struct clkgen_field pe[QUADFS_MAX_CHAN];

    struct clkgen_field sdiv[QUADFS_MAX_CHAN];

    struct clkgen_field nsdiv[QUADFS_MAX_CHAN];

​

    const struct clk_ops *pll_ops;

    int  (*get_params)(unsigned long, unsigned long, struct stm_fs *);

    int  (*get_rate)(unsigned long , const struct stm_fs *,

            unsigned long *);

};

​

static const struct clk_ops st_quadfs_pll_c32_ops;

static const struct clk_ops st_quadfs_fs660c32_ops;

​

static int clk_fs660c32_dig_get_params(unsigned long input,

        unsigned long output, struct stm_fs *fs);

static int clk_fs660c32_dig_get_rate(unsigned long, const struct stm_fs *,

        unsigned long *);

​

static const struct clkgen_quadfs_data st_fs660c32_C = {

    .nrst_present = true,

    .nrst   = { CLKGEN_FIELD(0x2f0, 0x1, 0),

            CLKGEN_FIELD(0x2f0, 0x1, 1),

            CLKGEN_FIELD(0x2f0, 0x1, 2),

            CLKGEN_FIELD(0x2f0, 0x1, 3) },

    .npda   = CLKGEN_FIELD(0x2f0, 0x1, 12),

    .nsb    = { CLKGEN_FIELD(0x2f0, 0x1, 8),

            CLKGEN_FIELD(0x2f0, 0x1, 9),

            CLKGEN_FIELD(0x2f0, 0x1, 10),

            CLKGEN_FIELD(0x2f0, 0x1, 11) },

    .nsdiv_present = true,