arch/sh/kernel/cpu/sh2a/clock-sh7203.c

   1 /*
   2  * arch/sh/kernel/cpu/sh2a/clock-sh7203.c
   3  *
   4  * SH7203 support for the clock framework
   5  *
   6  *  Copyright (C) 2007 Kieran Bingham (MPC-Data Ltd)
   7  *
   8  * Based on clock-sh7263.c
   9  *  Copyright (C) 2006  Yoshinori Sato
  10  *
  11  * Based on clock-sh4.c
  12  *  Copyright (C) 2005  Paul Mundt
  13  *
  14  * This file is subject to the terms and conditions of the GNU General Public
  15  * License.  See the file "COPYING" in the main directory of this archive
  16  * for more details.
  17  */
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <asm/clock.h>
  21 #include <asm/freq.h>
  22 #include <asm/io.h>
  23
  24 static const int pll1rate[]={8,12,16,0};
  25 static const int pfc_divisors[]={1,2,3,4,6,8,12};
  26 #define ifc_divisors pfc_divisors
  27
  28 #if (CONFIG_SH_CLK_MD == 0)
  29 #define PLL2 (1)
  30 #elif (CONFIG_SH_CLK_MD == 1)
  31 #define PLL2 (2)
  32 #elif (CONFIG_SH_CLK_MD == 2)
  33 #define PLL2 (4)
  34 #elif (CONFIG_SH_CLK_MD == 3)
  35 #define PLL2 (4)
  36 #else
  37 #error "Illegal Clock Mode!"
  38 #endif
  39
  40 static void master_clk_init(struct clk *clk)
  41 {
  42         clk->rate *= pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0003] * PLL2 ;
  43 }
  44
  45 static struct clk_ops sh7203_master_clk_ops = {
  46         .init           = master_clk_init,
  47 };
  48
  49 static void module_clk_recalc(struct clk *clk)
  50 {
  51         int idx = (ctrl_inw(FREQCR) & 0x0007);
  52         clk->rate = clk->parent->rate / pfc_divisors[idx];
  53 }
  54
  55 static struct clk_ops sh7203_module_clk_ops = {
  56         .recalc         = module_clk_recalc,
  57 };
  58
  59 static void bus_clk_recalc(struct clk *clk)
  60 {
  61         int idx = (ctrl_inw(FREQCR) & 0x0007);
  62         clk->rate = clk->parent->rate / pfc_divisors[idx-2];
  63 }
  64
  65 static struct clk_ops sh7203_bus_clk_ops = {
  66         .recalc         = bus_clk_recalc,
  67 };
  68
  69 static void cpu_clk_recalc(struct clk *clk)
  70 {
  71         clk->rate = clk->parent->rate;
  72 }
  73
  74 static struct clk_ops sh7203_cpu_clk_ops = {
  75         .recalc         = cpu_clk_recalc,
  76 };
  77
  78 static struct clk_ops *sh7203_clk_ops[] = {
  79         &sh7203_master_clk_ops,
  80         &sh7203_module_clk_ops,
  81         &sh7203_bus_clk_ops,
  82         &sh7203_cpu_clk_ops,
  83 };
  84
  85 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
  86 {
  87         if (idx < ARRAY_SIZE(sh7203_clk_ops))
  88                 *ops = sh7203_clk_ops[idx];
  89 }