arch/sh/kernel/cpu/sh4a/clock-sh7763.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh4a/clock-sh7763.c
   4  *
   5  * SH7763 support for the clock framework
   6  *
   7  *  Copyright (C) 2005  Paul Mundt
   8  *  Copyright (C) 2007  Yoshihiro Shimoda
   9  */
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/io.h>
  13 #include <linux/clkdev.h>
  14 #include <asm/clock.h>
  15 #include <asm/freq.h>
  16 #include <asm/io.h>
  17
  18 static int bfc_divisors[] = { 1, 1, 1, 8, 1, 1, 1, 1 };
  19 static int p0fc_divisors[] = { 1, 1, 1, 8, 1, 1, 1, 1 };
  20 static int cfc_divisors[] = { 1, 1, 4, 1, 1, 1, 1, 1 };
  21
  22 static void master_clk_init(struct clk *clk)
  23 {
  24         clk->rate *= p0fc_divisors[(__raw_readl(FRQCR) >> 4) & 0x07];
  25 }
  26
  27 static struct sh_clk_ops sh7763_master_clk_ops = {
  28         .init           = master_clk_init,
  29 };
  30
  31 static unsigned long module_clk_recalc(struct clk *clk)
  32 {
  33         int idx = ((__raw_readl(FRQCR) >> 4) & 0x07);
  34         return clk->parent->rate / p0fc_divisors[idx];
  35 }
  36
  37 static struct sh_clk_ops sh7763_module_clk_ops = {
  38         .recalc         = module_clk_recalc,
  39 };
  40
  41 static unsigned long bus_clk_recalc(struct clk *clk)
  42 {
  43         int idx = ((__raw_readl(FRQCR) >> 16) & 0x07);
  44         return clk->parent->rate / bfc_divisors[idx];
  45 }
  46
  47 static struct sh_clk_ops sh7763_bus_clk_ops = {
  48         .recalc         = bus_clk_recalc,
  49 };
  50
  51 static struct sh_clk_ops sh7763_cpu_clk_ops = {
  52         .recalc         = followparent_recalc,
  53 };
  54
  55 static struct sh_clk_ops *sh7763_clk_ops[] = {
  56         &sh7763_master_clk_ops,
  57         &sh7763_module_clk_ops,
  58         &sh7763_bus_clk_ops,
  59         &sh7763_cpu_clk_ops,
  60 };
  61
  62 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  63 {
  64         if (idx < ARRAY_SIZE(sh7763_clk_ops))
  65                 *ops = sh7763_clk_ops[idx];
  66 }
  67
  68 static unsigned long shyway_clk_recalc(struct clk *clk)
  69 {
  70         int idx = ((__raw_readl(FRQCR) >> 20) & 0x07);
  71         return clk->parent->rate / cfc_divisors[idx];
  72 }
  73
  74 static struct sh_clk_ops sh7763_shyway_clk_ops = {
  75         .recalc         = shyway_clk_recalc,
  76 };
  77
  78 static struct clk sh7763_shyway_clk = {
  79         .flags          = CLK_ENABLE_ON_INIT,
  80         .ops            = &sh7763_shyway_clk_ops,
  81 };
  82
  83 /*
  84  * Additional SH7763-specific on-chip clocks that aren't already part of the
  85  * clock framework
  86  */
  87 static struct clk *sh7763_onchip_clocks[] = {
  88         &sh7763_shyway_clk,
  89 };
  90
  91 static struct clk_lookup lookups[] = {
  92         /* main clocks */
  93         CLKDEV_CON_ID("shyway_clk", &sh7763_shyway_clk),
  94 };
  95
  96 int __init arch_clk_init(void)
  97 {
  98         struct clk *clk;
  99         int i, ret = 0;
 100
 101         cpg_clk_init();
 102
 103         clk = clk_get(NULL, "master_clk");
 104         for (i = 0; i < ARRAY_SIZE(sh7763_onchip_clocks); i++) {
 105                 struct clk *clkp = sh7763_onchip_clocks[i];
 106
 107                 clkp->parent = clk;
 108                 ret |= clk_register(clkp);
 109         }
 110
 111         clk_put(clk);
 112
 113         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 114
 115         return ret;
 116 }