arch/sh/kernel/cpu/sh4a/clock-sh7780.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh4a/clock-sh7780.c
   4  *
   5  * SH7780 support for the clock framework
   6  *
   7  *  Copyright (C) 2005  Paul Mundt
   8  */
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/io.h>
  12 #include <linux/clkdev.h>
  13 #include <asm/clock.h>
  14 #include <asm/freq.h>
  15 #include <asm/io.h>
  16
  17 static int ifc_divisors[] = { 2, 4 };
  18 static int bfc_divisors[] = { 1, 1, 1, 8, 12, 16, 24, 1 };
  19 static int pfc_divisors[] = { 1, 24, 24, 1 };
  20 static int cfc_divisors[] = { 1, 1, 4, 1, 6, 1, 1, 1 };
  21
  22 static void master_clk_init(struct clk *clk)
  23 {
  24         clk->rate *= pfc_divisors[__raw_readl(FRQCR) & 0x0003];
  25 }
  26
  27 static struct sh_clk_ops sh7780_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) & 0x0003);
  34         return clk->parent->rate / pfc_divisors[idx];
  35 }
  36
  37 static struct sh_clk_ops sh7780_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) & 0x0007);
  44         return clk->parent->rate / bfc_divisors[idx];
  45 }
  46
  47 static struct sh_clk_ops sh7780_bus_clk_ops = {
  48         .recalc         = bus_clk_recalc,
  49 };
  50
  51 static unsigned long cpu_clk_recalc(struct clk *clk)
  52 {
  53         int idx = ((__raw_readl(FRQCR) >> 24) & 0x0001);
  54         return clk->parent->rate / ifc_divisors[idx];
  55 }
  56
  57 static struct sh_clk_ops sh7780_cpu_clk_ops = {
  58         .recalc         = cpu_clk_recalc,
  59 };
  60
  61 static struct sh_clk_ops *sh7780_clk_ops[] = {
  62         &sh7780_master_clk_ops,
  63         &sh7780_module_clk_ops,
  64         &sh7780_bus_clk_ops,
  65         &sh7780_cpu_clk_ops,
  66 };
  67
  68 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  69 {
  70         if (idx < ARRAY_SIZE(sh7780_clk_ops))
  71                 *ops = sh7780_clk_ops[idx];
  72 }
  73
  74 static unsigned long shyway_clk_recalc(struct clk *clk)
  75 {
  76         int idx = ((__raw_readl(FRQCR) >> 20) & 0x0007);
  77         return clk->parent->rate / cfc_divisors[idx];
  78 }
  79
  80 static struct sh_clk_ops sh7780_shyway_clk_ops = {
  81         .recalc         = shyway_clk_recalc,
  82 };
  83
  84 static struct clk sh7780_shyway_clk = {
  85         .flags          = CLK_ENABLE_ON_INIT,
  86         .ops            = &sh7780_shyway_clk_ops,
  87 };
  88
  89 /*
  90  * Additional SH7780-specific on-chip clocks that aren't already part of the
  91  * clock framework
  92  */
  93 static struct clk *sh7780_onchip_clocks[] = {
  94         &sh7780_shyway_clk,
  95 };
  96
  97 static struct clk_lookup lookups[] = {
  98         /* main clocks */
  99         CLKDEV_CON_ID("shyway_clk", &sh7780_shyway_clk),
 100 };
 101
 102 int __init arch_clk_init(void)
 103 {
 104         struct clk *clk;
 105         int i, ret = 0;
 106
 107         cpg_clk_init();
 108
 109         clk = clk_get(NULL, "master_clk");
 110         for (i = 0; i < ARRAY_SIZE(sh7780_onchip_clocks); i++) {
 111                 struct clk *clkp = sh7780_onchip_clocks[i];
 112
 113                 clkp->parent = clk;
 114                 ret |= clk_register(clkp);
 115         }
 116
 117         clk_put(clk);
 118
 119         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 120
 121         return ret;
 122 }