arch/sh/kernel/cpu/sh3/clock-sh7706.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh3/clock-sh7706.c
   4  *
   5  * SH7706 support for the clock framework
   6  *
   7  *  Copyright (C) 2006  Takashi YOSHII
   8  *
   9  * Based on arch/sh/kernel/cpu/sh3/clock-sh7709.c
  10  *  Copyright (C) 2005  Andriy Skulysh
  11  */
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <asm/clock.h>
  15 #include <asm/freq.h>
  16 #include <asm/io.h>
  17
  18 static int stc_multipliers[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
  19 static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
  20 static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
  21
  22 static void master_clk_init(struct clk *clk)
  23 {
  24         int frqcr = __raw_readw(FRQCR);
  25         int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
  26
  27         clk->rate *= pfc_divisors[idx];
  28 }
  29
  30 static struct sh_clk_ops sh7706_master_clk_ops = {
  31         .init           = master_clk_init,
  32 };
  33
  34 static unsigned long module_clk_recalc(struct clk *clk)
  35 {
  36         int frqcr = __raw_readw(FRQCR);
  37         int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
  38
  39         return clk->parent->rate / pfc_divisors[idx];
  40 }
  41
  42 static struct sh_clk_ops sh7706_module_clk_ops = {
  43         .recalc         = module_clk_recalc,
  44 };
  45
  46 static unsigned long bus_clk_recalc(struct clk *clk)
  47 {
  48         int frqcr = __raw_readw(FRQCR);
  49         int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
  50
  51         return clk->parent->rate / stc_multipliers[idx];
  52 }
  53
  54 static struct sh_clk_ops sh7706_bus_clk_ops = {
  55         .recalc         = bus_clk_recalc,
  56 };
  57
  58 static unsigned long cpu_clk_recalc(struct clk *clk)
  59 {
  60         int frqcr = __raw_readw(FRQCR);
  61         int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
  62
  63         return clk->parent->rate / ifc_divisors[idx];
  64 }
  65
  66 static struct sh_clk_ops sh7706_cpu_clk_ops = {
  67         .recalc         = cpu_clk_recalc,
  68 };
  69
  70 static struct sh_clk_ops *sh7706_clk_ops[] = {
  71         &sh7706_master_clk_ops,
  72         &sh7706_module_clk_ops,
  73         &sh7706_bus_clk_ops,
  74         &sh7706_cpu_clk_ops,
  75 };
  76
  77 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  78 {
  79         if (idx < ARRAY_SIZE(sh7706_clk_ops))
  80                 *ops = sh7706_clk_ops[idx];
  81 }