1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/cpu/sh3/clock-sh7709.c 4 * 5 * SH7709 support for the clock framework 6 * 7 * Copyright (C) 2005 Andriy Skulysh 8 * 9 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c 10 * Copyright (C) 2005 Paul Mundt 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, 8, 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 sh7709_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 sh7709_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 & 0x0080) ? 50 ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1; 51 52 return clk->parent->rate * stc_multipliers[idx]; 53 } 54 55 static struct sh_clk_ops sh7709_bus_clk_ops = { 56 .recalc = bus_clk_recalc, 57 }; 58 59 static unsigned long cpu_clk_recalc(struct clk *clk) 60 { 61 int frqcr = __raw_readw(FRQCR); 62 int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2); 63 64 return clk->parent->rate / ifc_divisors[idx]; 65 } 66 67 static struct sh_clk_ops sh7709_cpu_clk_ops = { 68 .recalc = cpu_clk_recalc, 69 }; 70 71 static struct sh_clk_ops *sh7709_clk_ops[] = { 72 &sh7709_master_clk_ops, 73 &sh7709_module_clk_ops, 74 &sh7709_bus_clk_ops, 75 &sh7709_cpu_clk_ops, 76 }; 77 78 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) 79 { 80 if (idx < ARRAY_SIZE(sh7709_clk_ops)) 81 *ops = sh7709_clk_ops[idx]; 82 } 83