LXR linux/drivers/clk/sunxi-ng/ccu

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (c) 2017 Chen-Yu Tsai. All rights reserved.
   4 */
   5
   6#ifndef _CCU_SDM_H
   7#define _CCU_SDM_H
   8
   9#include <linux/clk-provider.h>
  10
  11#include "ccu_common.h"
  12
  13struct ccu_sdm_setting {
  14        unsigned long   rate;
  15
  16        /*
  17         * XXX We don't know what the step and bottom register fields
  18         * mean. Just copy the whole register value from the vendor
  19         * kernel for now.
  20         */
  21        u32             pattern;
  22
  23        /*
  24         * M and N factors here should be the values used in
  25         * calculation, not the raw values written to registers
  26         */
  27        u32             m;
  28        u32             n;
  29};
  30
  31struct ccu_sdm_internal {
  32        struct ccu_sdm_setting  *table;
  33        u32             table_size;
  34        /* early SoCs don't have the SDM enable bit in the PLL register */
  35        u32             enable;
  36        /* second enable bit in tuning register */
  37        u32             tuning_enable;
  38        u16             tuning_reg;
  39};
  40
  41#define _SUNXI_CCU_SDM(_table, _enable,                 \
  42                       _reg, _reg_enable)               \
  43        {                                               \
  44                .table          = _table,               \
  45                .table_size     = ARRAY_SIZE(_table),   \
  46                .enable         = _enable,              \
  47                .tuning_enable  = _reg_enable,          \
  48                .tuning_reg     = _reg,                 \
  49        }
  50
  51bool ccu_sdm_helper_is_enabled(struct ccu_common *common,
  52                               struct ccu_sdm_internal *sdm);
  53void ccu_sdm_helper_enable(struct ccu_common *common,
  54                           struct ccu_sdm_internal *sdm,
  55                           unsigned long rate);
  56void ccu_sdm_helper_disable(struct ccu_common *common,
  57                            struct ccu_sdm_internal *sdm);
  58
  59bool ccu_sdm_helper_has_rate(struct ccu_common *common,
  60                             struct ccu_sdm_internal *sdm,
  61                             unsigned long rate);
  62
  63unsigned long ccu_sdm_helper_read_rate(struct ccu_common *common,
  64                                       struct ccu_sdm_internal *sdm,
  65                                       u32 m, u32 n);
  66
  67int ccu_sdm_helper_get_factors(struct ccu_common *common,
  68                               struct ccu_sdm_internal *sdm,
  69                               unsigned long rate,
  70                               unsigned long *m, unsigned long *n);
  71
  72#endif
  73