drivers/clk/sunxi-ng/ccu_mux.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _CCU_MUX_H_
   3 #define _CCU_MUX_H_
   4
   5 #include <linux/clk-provider.h>
   6
   7 #include "ccu_common.h"
   8
   9 struct ccu_mux_fixed_prediv {
  10         u8      index;
  11         u16     div;
  12 };
  13
  14 struct ccu_mux_var_prediv {
  15         u8      index;
  16         u8      shift;
  17         u8      width;
  18 };
  19
  20 struct ccu_mux_internal {
  21         u8              shift;
  22         u8              width;
  23         const u8        *table;
  24
  25         const struct ccu_mux_fixed_prediv       *fixed_predivs;
  26         u8              n_predivs;
  27
  28         const struct ccu_mux_var_prediv         *var_predivs;
  29         u8              n_var_predivs;
  30 };
  31
  32 #define _SUNXI_CCU_MUX_TABLE(_shift, _width, _table)    \
  33         {                                               \
  34                 .shift  = _shift,                       \
  35                 .width  = _width,                       \
  36                 .table  = _table,                       \
  37         }
  38
  39 #define _SUNXI_CCU_MUX(_shift, _width) \
  40         _SUNXI_CCU_MUX_TABLE(_shift, _width, NULL)
  41
  42 struct ccu_mux {
  43         u16                     reg;
  44         u32                     enable;
  45
  46         struct ccu_mux_internal mux;
  47         struct ccu_common       common;
  48 };
  49
  50 #define SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, _table, \
  51                                      _reg, _shift, _width, _gate,       \
  52                                      _flags)                            \
  53         struct ccu_mux _struct = {                                      \
  54                 .enable = _gate,                                        \
  55                 .mux    = _SUNXI_CCU_MUX_TABLE(_shift, _width, _table), \
  56                 .common = {                                             \
  57                         .reg            = _reg,                         \
  58                         .hw.init        = CLK_HW_INIT_PARENTS(_name,    \
  59                                                               _parents, \
  60                                                               &ccu_mux_ops, \
  61                                                               _flags),  \
  62                 }                                                       \
  63         }
  64
  65 #define SUNXI_CCU_MUX_WITH_GATE(_struct, _name, _parents, _reg,         \
  66                                 _shift, _width, _gate, _flags)          \
  67         SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL,   \
  68                                       _reg, _shift, _width, _gate,      \
  69                                       _flags)
  70
  71 #define SUNXI_CCU_MUX(_struct, _name, _parents, _reg, _shift, _width,   \
  72                       _flags)                                           \
  73         SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, NULL,   \
  74                                       _reg, _shift, _width, 0, _flags)
  75
  76 static inline struct ccu_mux *hw_to_ccu_mux(struct clk_hw *hw)
  77 {
  78         struct ccu_common *common = hw_to_ccu_common(hw);
  79
  80         return container_of(common, struct ccu_mux, common);
  81 }
  82
  83 extern const struct clk_ops ccu_mux_ops;
  84
  85 unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common,
  86                                           struct ccu_mux_internal *cm,
  87                                           int parent_index,
  88                                           unsigned long parent_rate);
  89 int ccu_mux_helper_determine_rate(struct ccu_common *common,
  90                                   struct ccu_mux_internal *cm,
  91                                   struct clk_rate_request *req,
  92                                   unsigned long (*round)(struct ccu_mux_internal *,
  93                                                          struct clk_hw *,
  94                                                          unsigned long *,
  95                                                          unsigned long,
  96                                                          void *),
  97                                   void *data);
  98 u8 ccu_mux_helper_get_parent(struct ccu_common *common,
  99                              struct ccu_mux_internal *cm);
 100 int ccu_mux_helper_set_parent(struct ccu_common *common,
 101                               struct ccu_mux_internal *cm,
 102                               u8 index);
 103
 104 struct ccu_mux_nb {
 105         struct notifier_block   clk_nb;
 106         struct ccu_common       *common;
 107         struct ccu_mux_internal *cm;
 108
 109         u32     delay_us;       /* How many us to wait after reparenting */
 110         u8      bypass_index;   /* Which parent to temporarily use */
 111         u8      original_index; /* This is set by the notifier callback */
 112 };
 113
 114 #define to_ccu_mux_nb(_nb) container_of(_nb, struct ccu_mux_nb, clk_nb)
 115
 116 int ccu_mux_notifier_register(struct clk *clk, struct ccu_mux_nb *mux_nb);
 117
 118 #endif /* _CCU_MUX_H_ */