arch/sh/kernel/cpu/sh3/clock-sh7710.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh3/clock-sh7710.c
   4  *
   5  * SH7710 support for the clock framework
   6  *
   7  *  Copyright (C) 2005  Paul Mundt
   8  *
   9  * FRQCR parsing hacked out of arch/sh/kernel/time.c
  10  *
  11  *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
  12  *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
  13  *  Copyright (C) 2002, 2003, 2004  Paul Mundt
  14  *  Copyright (C) 2002  M. R. Brown  <mrbrown@linux-sh.org>
  15  */
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <asm/clock.h>
  19 #include <asm/freq.h>
  20 #include <asm/io.h>
  21
  22 static int md_table[] = { 1, 2, 3, 4, 6, 8, 12 };
  23
  24 static void master_clk_init(struct clk *clk)
  25 {
  26         clk->rate *= md_table[__raw_readw(FRQCR) & 0x0007];
  27 }
  28
  29 static struct sh_clk_ops sh7710_master_clk_ops = {
  30         .init           = master_clk_init,
  31 };
  32
  33 static unsigned long module_clk_recalc(struct clk *clk)
  34 {
  35         int idx = (__raw_readw(FRQCR) & 0x0007);
  36         return clk->parent->rate / md_table[idx];
  37 }
  38
  39 static struct sh_clk_ops sh7710_module_clk_ops = {
  40         .recalc         = module_clk_recalc,
  41 };
  42
  43 static unsigned long bus_clk_recalc(struct clk *clk)
  44 {
  45         int idx = (__raw_readw(FRQCR) & 0x0700) >> 8;
  46         return clk->parent->rate / md_table[idx];
  47 }
  48
  49 static struct sh_clk_ops sh7710_bus_clk_ops = {
  50         .recalc         = bus_clk_recalc,
  51 };
  52
  53 static unsigned long cpu_clk_recalc(struct clk *clk)
  54 {
  55         int idx = (__raw_readw(FRQCR) & 0x0070) >> 4;
  56         return clk->parent->rate / md_table[idx];
  57 }
  58
  59 static struct sh_clk_ops sh7710_cpu_clk_ops = {
  60         .recalc         = cpu_clk_recalc,
  61 };
  62
  63 static struct sh_clk_ops *sh7710_clk_ops[] = {
  64         &sh7710_master_clk_ops,
  65         &sh7710_module_clk_ops,
  66         &sh7710_bus_clk_ops,
  67         &sh7710_cpu_clk_ops,
  68 };
  69
  70 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  71 {
  72         if (idx < ARRAY_SIZE(sh7710_clk_ops))
  73                 *ops = sh7710_clk_ops[idx];
  74 }
  75