LXR linux/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
  26struct module;
  27
  28struct clk {
  29#ifndef CONFIG_COMMON_CLKDEV
  30        /* As soon as i.MX1 and i.MX31 switched to clkdev, this
  31         * block can go away */
  32        struct list_head node;
  33        struct module *owner;
  34        const char *name;
  35#endif
  36        int id;
  37        /* Source clock this clk depends on */
  38        struct clk *parent;
  39        /* Secondary clock to enable/disable with this clock */
  40        struct clk *secondary;
  41        /* Reference count of clock enable/disable */
  42        __s8 usecount;
  43        /* Register bit position for clock's enable/disable control. */
  44        u8 enable_shift;
  45        /* Register address for clock's enable/disable control. */
  46        void __iomem *enable_reg;
  47        u32 flags;
  48        /* get the current clock rate (always a fresh value) */
  49        unsigned long (*get_rate) (struct clk *);
  50        /* Function ptr to set the clock to a new rate. The rate must match a
  51           supported rate returned from round_rate. Leave blank if clock is not
  52           programmable */
  53        int (*set_rate) (struct clk *, unsigned long);
  54        /* Function ptr to round the requested clock rate to the nearest
  55           supported rate that is less than or equal to the requested rate. */
  56        unsigned long (*round_rate) (struct clk *, unsigned long);
  57        /* Function ptr to enable the clock. Leave blank if clock can not
  58           be gated. */
  59        int (*enable) (struct clk *);
  60        /* Function ptr to disable the clock. Leave blank if clock can not
  61           be gated. */
  62        void (*disable) (struct clk *);
  63        /* Function ptr to set the parent clock of the clock. */
  64        int (*set_parent) (struct clk *, struct clk *);
  65};
  66
  67int clk_register(struct clk *clk);
  68void clk_unregister(struct clk *clk);
  69
  70unsigned long mxc_decode_pll(unsigned int pll, u32 f_ref);
  71
  72#endif /* __ASSEMBLY__ */
  73#endif /* __ASM_ARCH_MXC_CLOCK_H__ */
  74