arch/arm/mach-shmobile/clock.c

   1 /*
   2  * SH-Mobile Clock Framework
   3  *
   4  * Copyright (C) 2010  Magnus Damm
   5  *
   6  * Used together with arch/arm/common/clkdev.c and drivers/sh/clk.c.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  *
  21  */
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24
  25 #ifdef CONFIG_COMMON_CLK
  26 #include <linux/clk.h>
  27 #include <linux/clkdev.h>
  28 #include <mach/clock.h>
  29
  30 void __init shmobile_clk_workaround(const struct clk_name *clks,
  31                                     int nr_clks, bool enable)
  32 {
  33         const struct clk_name *clkn;
  34         struct clk *clk;
  35         unsigned int i;
  36
  37         for (i = 0; i < nr_clks; ++i) {
  38                 clkn = clks + i;
  39                 clk = clk_get(NULL, clkn->clk);
  40                 if (!IS_ERR(clk)) {
  41                         clk_register_clkdev(clk, clkn->con_id, clkn->dev_id);
  42                         if (enable)
  43                                 clk_prepare_enable(clk);
  44                         clk_put(clk);
  45                 }
  46         }
  47 }
  48
  49 #else /* CONFIG_COMMON_CLK */
  50 #include <linux/sh_clk.h>
  51 #include <linux/export.h>
  52 #include <mach/clock.h>
  53 #include <mach/common.h>
  54
  55 unsigned long shmobile_fixed_ratio_clk_recalc(struct clk *clk)
  56 {
  57         struct clk_ratio *p = clk->priv;
  58
  59         return clk->parent->rate / p->div * p->mul;
  60 };
  61
  62 struct sh_clk_ops shmobile_fixed_ratio_clk_ops = {
  63         .recalc = shmobile_fixed_ratio_clk_recalc,
  64 };
  65
  66 int __init shmobile_clk_init(void)
  67 {
  68         /* Kick the child clocks.. */
  69         recalculate_root_clocks();
  70
  71         /* Enable the necessary init clocks */
  72         clk_enable_init_clocks();
  73
  74         return 0;
  75 }
  76
  77 int __clk_get(struct clk *clk)
  78 {
  79         return 1;
  80 }
  81 EXPORT_SYMBOL(__clk_get);
  82
  83 void __clk_put(struct clk *clk)
  84 {
  85 }
  86 EXPORT_SYMBOL(__clk_put);
  87
  88 #endif /* CONFIG_COMMON_CLK */