LXR linux/arch/sh/kernel/cpu/sh3/clock-sh7709.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * arch/sh/kernel/cpu/sh3/clock-sh7709.c
   4 *
   5 * SH7709 support for the clock framework
   6 *
   7 *  Copyright (C) 2005  Andriy Skulysh
   8 *
   9 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c
  10 *  Copyright (C) 2005  Paul Mundt
  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
  18static int stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 };
  19static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
  20static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
  21
  22static 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
  30static struct sh_clk_ops sh7709_master_clk_ops = {
  31        .init           = master_clk_init,
  32};
  33
  34static 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
  42static struct sh_clk_ops sh7709_module_clk_ops = {
  43        .recalc         = module_clk_recalc,
  44};
  45
  46static unsigned long bus_clk_recalc(struct clk *clk)
  47{
  48        int frqcr = __raw_readw(FRQCR);
  49        int idx = (frqcr & 0x0080) ?
  50                ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
  51
  52        return clk->parent->rate * stc_multipliers[idx];
  53}
  54
  55static struct sh_clk_ops sh7709_bus_clk_ops = {
  56        .recalc         = bus_clk_recalc,
  57};
  58
  59static unsigned long cpu_clk_recalc(struct clk *clk)
  60{
  61        int frqcr = __raw_readw(FRQCR);
  62        int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
  63
  64        return clk->parent->rate / ifc_divisors[idx];
  65}
  66
  67static struct sh_clk_ops sh7709_cpu_clk_ops = {
  68        .recalc         = cpu_clk_recalc,
  69};
  70
  71static struct sh_clk_ops *sh7709_clk_ops[] = {
  72        &sh7709_master_clk_ops,
  73        &sh7709_module_clk_ops,
  74        &sh7709_bus_clk_ops,
  75        &sh7709_cpu_clk_ops,
  76};
  77
  78void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  79{
  80        if (idx < ARRAY_SIZE(sh7709_clk_ops))
  81                *ops = sh7709_clk_ops[idx];
  82}
  83