arch/sh/kernel/cpu/sh2/clock-sh7619.c

   1 /*
   2  * arch/sh/kernel/cpu/sh2/clock-sh7619.c
   3  *
   4  * SH7619 support for the clock framework
   5  *
   6  *  Copyright (C) 2006  Yoshinori Sato
   7  *
   8  * Based on clock-sh4.c
   9  *  Copyright (C) 2005  Paul Mundt
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <asm/clock.h>
  18 #include <asm/freq.h>
  19 #include <asm/io.h>
  20
  21 static const int pll1rate[] = {1,2};
  22 static const int pfc_divisors[] = {1,2,0,4};
  23
  24 #if (CONFIG_SH_CLK_MD == 1) || (CONFIG_SH_CLK_MD == 2)
  25 #define PLL2 (4)
  26 #elif (CONFIG_SH_CLK_MD == 5) || (CONFIG_SH_CLK_MD == 6)
  27 #define PLL2 (2)
  28 #else
  29 #error "Illigal Clock Mode!"
  30 #endif
  31
  32 static void master_clk_init(struct clk *clk)
  33 {
  34         clk->rate *= PLL2 * pll1rate[(ctrl_inw(FREQCR) >> 8) & 7];
  35 }
  36
  37 static struct clk_ops sh7619_master_clk_ops = {
  38         .init           = master_clk_init,
  39 };
  40
  41 static void module_clk_recalc(struct clk *clk)
  42 {
  43         int idx = (ctrl_inw(FREQCR) & 0x0007);
  44         clk->rate = clk->parent->rate / pfc_divisors[idx];
  45 }
  46
  47 static struct clk_ops sh7619_module_clk_ops = {
  48         .recalc         = module_clk_recalc,
  49 };
  50
  51 static void bus_clk_recalc(struct clk *clk)
  52 {
  53         clk->rate = clk->parent->rate / pll1rate[(ctrl_inw(FREQCR) >> 8) & 7];
  54 }
  55
  56 static struct clk_ops sh7619_bus_clk_ops = {
  57         .recalc         = bus_clk_recalc,
  58 };
  59
  60 static void cpu_clk_recalc(struct clk *clk)
  61 {
  62         clk->rate = clk->parent->rate;
  63 }
  64
  65 static struct clk_ops sh7619_cpu_clk_ops = {
  66         .recalc         = cpu_clk_recalc,
  67 };
  68
  69 static struct clk_ops *sh7619_clk_ops[] = {
  70         &sh7619_master_clk_ops,
  71         &sh7619_module_clk_ops,
  72         &sh7619_bus_clk_ops,
  73         &sh7619_cpu_clk_ops,
  74 };
  75
  76 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
  77 {
  78         if (idx < ARRAY_SIZE(sh7619_clk_ops))
  79                 *ops = sh7619_clk_ops[idx];
  80 }
  81