arch/arm/plat-mxc/include/mach/clock.h

   1 /*
   2  * Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   3  * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  17  * MA  02110-1301, USA.
  18  */
  19
  20 #ifndef __ASM_ARCH_MXC_CLOCK_H__
  21 #define __ASM_ARCH_MXC_CLOCK_H__
  22
  23 #ifndef __ASSEMBLY__
  24 #include <linux/list.h>
  25
  26 struct module;
  27
  28 struct clk {
  29         int id;
  30         /* Source clock this clk depends on */
  31         struct clk *parent;
  32         /* Secondary clock to enable/disable with this clock */
  33         struct clk *secondary;
  34         /* Reference count of clock enable/disable */
  35         __s8 usecount;
  36         /* Register bit position for clock's enable/disable control. */
  37         u8 enable_shift;
  38         /* Register address for clock's enable/disable control. */
  39         void __iomem *enable_reg;
  40         u32 flags;
  41         /* get the current clock rate (always a fresh value) */
  42         unsigned long (*get_rate) (struct clk *);
  43         /* Function ptr to set the clock to a new rate. The rate must match a
  44            supported rate returned from round_rate. Leave blank if clock is not
  45            programmable */
  46         int (*set_rate) (struct clk *, unsigned long);
  47         /* Function ptr to round the requested clock rate to the nearest
  48            supported rate that is less than or equal to the requested rate. */
  49         unsigned long (*round_rate) (struct clk *, unsigned long);
  50         /* Function ptr to enable the clock. Leave blank if clock can not
  51            be gated. */
  52         int (*enable) (struct clk *);
  53         /* Function ptr to disable the clock. Leave blank if clock can not
  54            be gated. */
  55         void (*disable) (struct clk *);
  56         /* Function ptr to set the parent clock of the clock. */
  57         int (*set_parent) (struct clk *, struct clk *);
  58 };
  59
  60 int clk_register(struct clk *clk);
  61 void clk_unregister(struct clk *clk);
  62
  63 unsigned long mxc_decode_pll(unsigned int pll, u32 f_ref);
  64
  65 #endif /* __ASSEMBLY__ */
  66 #endif /* __ASM_ARCH_MXC_CLOCK_H__ */