1 /* 2 * arch/sh/kernel/cpu/sh3/clock-sh7709.c 3 * 4 * SH7709 support for the clock framework 5 * 6 * Copyright (C) 2005 Andriy Skulysh 7 * 8 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c 9 * Copyright (C) 2005 Paul Mundt 10 * 11 * This file is subject to the terms and conditions of the GNU General Public 12 * License. See the file "COPYING" in the main directory of this archive 13 * for more details. 14 */ 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <asm/clock.h> 18 #include <asm/freq.h> 19 #include <asm/io.h> 20 21 static int stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 }; 22 static int ifc_divisors[] = { 1, 2, 4, 1, 3, 1, 1, 1 }; 23 static int pfc_divisors[] = { 1, 2, 4, 1, 3, 6, 1, 1 }; 24 25 static void master_clk_init(struct clk *clk) 26 { 27 int frqcr = __raw_readw(FRQCR); 28 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); 29 30 clk->rate *= pfc_divisors[idx]; 31 } 32 33 static struct sh_clk_ops sh7709_master_clk_ops = { 34 .init = master_clk_init, 35 }; 36 37 static unsigned long module_clk_recalc(struct clk *clk) 38 { 39 int frqcr = __raw_readw(FRQCR); 40 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); 41 42 return clk->parent->rate / pfc_divisors[idx]; 43 } 44 45 static struct sh_clk_ops sh7709_module_clk_ops = { 46 .recalc = module_clk_recalc, 47 }; 48 49 static unsigned long bus_clk_recalc(struct clk *clk) 50 { 51 int frqcr = __raw_readw(FRQCR); 52 int idx = (frqcr & 0x0080) ? 53 ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1; 54 55 return clk->parent->rate * stc_multipliers[idx]; 56 } 57 58 static struct sh_clk_ops sh7709_bus_clk_ops = { 59 .recalc = bus_clk_recalc, 60 }; 61 62 static unsigned long cpu_clk_recalc(struct clk *clk) 63 { 64 int frqcr = __raw_readw(FRQCR); 65 int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2); 66 67 return clk->parent->rate / ifc_divisors[idx]; 68 } 69 70 static struct sh_clk_ops sh7709_cpu_clk_ops = { 71 .recalc = cpu_clk_recalc, 72 }; 73 74 static struct sh_clk_ops *sh7709_clk_ops[] = { 75 &sh7709_master_clk_ops, 76 &sh7709_module_clk_ops, 77 &sh7709_bus_clk_ops, 78 &sh7709_cpu_clk_ops, 79 }; 80 81 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) 82 { 83 if (idx < ARRAY_SIZE(sh7709_clk_ops)) 84 *ops = sh7709_clk_ops[idx]; 85 } 86