arch/mips/jz4740/clock.h

   1 /*
   2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *  JZ4740 SoC clock support
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  *  You should have received a copy of the  GNU General Public License along
  11  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  12  *  675 Mass Ave, Cambridge, MA 02139, USA.
  13  *
  14  */
  15
  16 #ifndef __MIPS_JZ4740_CLOCK_H__
  17 #define __MIPS_JZ4740_CLOCK_H__
  18
  19 #include <linux/list.h>
  20
  21 struct jz4740_clock_board_data {
  22         unsigned long ext_rate;
  23         unsigned long rtc_rate;
  24 };
  25
  26 extern struct jz4740_clock_board_data jz4740_clock_bdata;
  27
  28 void jz4740_clock_suspend(void);
  29 void jz4740_clock_resume(void);
  30
  31 struct clk;
  32
  33 struct clk_ops {
  34         unsigned long (*get_rate)(struct clk *clk);
  35         unsigned long (*round_rate)(struct clk *clk, unsigned long rate);
  36         int (*set_rate)(struct clk *clk, unsigned long rate);
  37         int (*enable)(struct clk *clk);
  38         int (*disable)(struct clk *clk);
  39         int (*is_enabled)(struct clk *clk);
  40
  41         int (*set_parent)(struct clk *clk, struct clk *parent);
  42
  43 };
  44
  45 struct clk {
  46         const char *name;
  47         struct clk *parent;
  48
  49         uint32_t gate_bit;
  50
  51         const struct clk_ops *ops;
  52
  53         struct list_head list;
  54
  55 #ifdef CONFIG_DEBUG_FS
  56         struct dentry *debugfs_entry;
  57         struct dentry *debugfs_parent_entry;
  58 #endif
  59
  60 };
  61
  62 #define JZ4740_CLK_NOT_GATED ((uint32_t)-1)
  63
  64 int clk_is_enabled(struct clk *clk);
  65
  66 #ifdef CONFIG_DEBUG_FS
  67 void jz4740_clock_debugfs_init(void);
  68 void jz4740_clock_debugfs_add_clk(struct clk *clk);
  69 void jz4740_clock_debugfs_update_parent(struct clk *clk);
  70 #else
  71 static inline void jz4740_clock_debugfs_init(void) {};
  72 static inline void jz4740_clock_debugfs_add_clk(struct clk *clk) {};
  73 static inline void jz4740_clock_debugfs_update_parent(struct clk *clk) {};
  74 #endif
  75
  76 #endif