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Linux/arch/sh/kernel/cpu/sh3/clock-sh7706.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * arch/sh/kernel/cpu/sh3/clock-sh7706.c
  4  *
  5  * SH7706 support for the clock framework
  6  *
  7  *  Copyright (C) 2006  Takashi YOSHII
  8  *
  9  * Based on arch/sh/kernel/cpu/sh3/clock-sh7709.c
 10  *  Copyright (C) 2005  Andriy Skulysh
 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 
 18 static int stc_multipliers[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
 19 static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
 20 static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
 21 
 22 static 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 
 30 static struct sh_clk_ops sh7706_master_clk_ops = {
 31         .init           = master_clk_init,
 32 };
 33 
 34 static 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 
 42 static struct sh_clk_ops sh7706_module_clk_ops = {
 43         .recalc         = module_clk_recalc,
 44 };
 45 
 46 static unsigned long bus_clk_recalc(struct clk *clk)
 47 {
 48         int frqcr = __raw_readw(FRQCR);
 49         int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
 50 
 51         return clk->parent->rate / stc_multipliers[idx];
 52 }
 53 
 54 static struct sh_clk_ops sh7706_bus_clk_ops = {
 55         .recalc         = bus_clk_recalc,
 56 };
 57 
 58 static unsigned long cpu_clk_recalc(struct clk *clk)
 59 {
 60         int frqcr = __raw_readw(FRQCR);
 61         int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
 62 
 63         return clk->parent->rate / ifc_divisors[idx];
 64 }
 65 
 66 static struct sh_clk_ops sh7706_cpu_clk_ops = {
 67         .recalc         = cpu_clk_recalc,
 68 };
 69 
 70 static struct sh_clk_ops *sh7706_clk_ops[] = {
 71         &sh7706_master_clk_ops,
 72         &sh7706_module_clk_ops,
 73         &sh7706_bus_clk_ops,
 74         &sh7706_cpu_clk_ops,
 75 };
 76 
 77 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
 78 {
 79         if (idx < ARRAY_SIZE(sh7706_clk_ops))
 80                 *ops = sh7706_clk_ops[idx];
 81 }
 82 

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