arch/sh/kernel/cpu/sh2/clock-sh7619.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh2/clock-sh7619.c
   4  *
   5  * SH7619 support for the clock framework
   6  *
   7  *  Copyright (C) 2006  Yoshinori Sato
   8  *
   9  * Based on clock-sh4.c
  10  *  Copyright (C) 2005  Paul Mundt
  11  */
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/io.h>
  15 #include <asm/clock.h>
  16 #include <asm/freq.h>
  17 #include <asm/processor.h>
  18
  19 static const int pll1rate[] = {1,2};
  20 static const int pfc_divisors[] = {1,2,0,4};
  21 static unsigned int pll2_mult;
  22
  23 static void master_clk_init(struct clk *clk)
  24 {
  25         clk->rate *= pll2_mult * pll1rate[(__raw_readw(FREQCR) >> 8) & 7];
  26 }
  27
  28 static struct sh_clk_ops sh7619_master_clk_ops = {
  29         .init           = master_clk_init,
  30 };
  31
  32 static unsigned long module_clk_recalc(struct clk *clk)
  33 {
  34         int idx = (__raw_readw(FREQCR) & 0x0007);
  35         return clk->parent->rate / pfc_divisors[idx];
  36 }
  37
  38 static struct sh_clk_ops sh7619_module_clk_ops = {
  39         .recalc         = module_clk_recalc,
  40 };
  41
  42 static unsigned long bus_clk_recalc(struct clk *clk)
  43 {
  44         return clk->parent->rate / pll1rate[(__raw_readw(FREQCR) >> 8) & 7];
  45 }
  46
  47 static struct sh_clk_ops sh7619_bus_clk_ops = {
  48         .recalc         = bus_clk_recalc,
  49 };
  50
  51 static struct sh_clk_ops sh7619_cpu_clk_ops = {
  52         .recalc         = followparent_recalc,
  53 };
  54
  55 static struct sh_clk_ops *sh7619_clk_ops[] = {
  56         &sh7619_master_clk_ops,
  57         &sh7619_module_clk_ops,
  58         &sh7619_bus_clk_ops,
  59         &sh7619_cpu_clk_ops,
  60 };
  61
  62 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
  63 {
  64         if (test_mode_pin(MODE_PIN2 | MODE_PIN0) ||
  65             test_mode_pin(MODE_PIN2 | MODE_PIN1))
  66                 pll2_mult = 2;
  67         else if (test_mode_pin(MODE_PIN0) || test_mode_pin(MODE_PIN1))
  68                 pll2_mult = 4;
  69
  70         BUG_ON(!pll2_mult);
  71
  72         if (idx < ARRAY_SIZE(sh7619_clk_ops))
  73                 *ops = sh7619_clk_ops[idx];
  74 }