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