include/clk/sunxi.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Amarula Solutions.
   4  * Author: Jagan Teki <jagan@amarulasolutions.com>
   5  */
   6
   7 #ifndef _CLK_SUNXI_H
   8 #define _CLK_SUNXI_H
   9
  10 #include <linux/bitops.h>
  11
  12 /**
  13  * enum ccu_flags - ccu clock/reset flags
  14  *
  15  * @CCU_CLK_F_IS_VALID:         is given clock gate is valid?
  16  * @CCU_RST_F_IS_VALID:         is given reset control is valid?
  17  */
  18 enum ccu_flags {
  19         CCU_CLK_F_IS_VALID              = BIT(0),
  20         CCU_RST_F_IS_VALID              = BIT(1),
  21         CCU_CLK_F_DUMMY_GATE            = BIT(2),
  22 };
  23
  24 /**
  25  * struct ccu_clk_gate - ccu clock gate
  26  * @off:        gate offset
  27  * @bit:        gate bit
  28  * @flags:      ccu clock gate flags
  29  */
  30 struct ccu_clk_gate {
  31         u16 off;
  32         u32 bit;
  33         enum ccu_flags flags;
  34 };
  35
  36 #define GATE(_off, _bit) {                      \
  37         .off = _off,                            \
  38         .bit = _bit,                            \
  39         .flags = CCU_CLK_F_IS_VALID,            \
  40 }
  41
  42 #define GATE_DUMMY {                            \
  43         .flags = CCU_CLK_F_DUMMY_GATE,          \
  44 }
  45
  46 /**
  47  * struct ccu_reset - ccu reset
  48  * @off:        reset offset
  49  * @bit:        reset bit
  50  * @flags:      ccu reset control flags
  51  */
  52 struct ccu_reset {
  53         u16 off;
  54         u32 bit;
  55         enum ccu_flags flags;
  56 };
  57
  58 #define RESET(_off, _bit) {                     \
  59         .off = _off,                            \
  60         .bit = _bit,                            \
  61         .flags = CCU_RST_F_IS_VALID,            \
  62 }
  63
  64 /**
  65  * struct ccu_desc - clock control unit descriptor
  66  *
  67  * @gates:      clock gates
  68  * @resets:     reset unit
  69  */
  70 struct ccu_desc {
  71         const struct ccu_clk_gate *gates;
  72         const struct ccu_reset *resets;
  73         u8 num_gates;
  74         u8 num_resets;
  75 };
  76
  77 /**
  78  * struct ccu_priv - sunxi clock control unit
  79  *
  80  * @base:       base address
  81  * @desc:       ccu descriptor
  82  */
  83 struct ccu_priv {
  84         void *base;
  85         const struct ccu_desc *desc;
  86 };
  87
  88 extern struct clk_ops sunxi_clk_ops;
  89
  90 /**
  91  * sunxi_reset_bind() - reset binding
  92  *
  93  * @dev:       reset device
  94  * Return: 0 success, or error value
  95  */
  96 int sunxi_reset_bind(struct udevice *dev);
  97
  98 #endif /* _CLK_SUNXI_H */