1/* 2 * arch/sh/kernel/cpu/sh4a/clock-sh7770.c 3 * 4 * SH7770 support for the clock framework 5 * 6 * Copyright (C) 2005 Paul Mundt 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 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 18static int ifc_divisors[] = { 1, 1, 1, 1, 1, 1, 1, 1 }; 19static int bfc_divisors[] = { 1, 1, 1, 1, 1, 8,12, 1 }; 20static int pfc_divisors[] = { 1, 8, 1,10,12,16, 1, 1 }; 21 22static void master_clk_init(struct clk *clk) 23{ 24 clk->rate *= pfc_divisors[(ctrl_inl(FRQCR) >> 28) & 0x000f]; 25} 26 27static struct clk_ops sh7770_master_clk_ops = { 28 .init = master_clk_init, 29}; 30 31static void module_clk_recalc(struct clk *clk) 32{ 33 int idx = ((ctrl_inl(FRQCR) >> 28) & 0x000f); 34 clk->rate = clk->parent->rate / pfc_divisors[idx]; 35} 36 37static struct clk_ops sh7770_module_clk_ops = { 38 .recalc = module_clk_recalc, 39}; 40 41static void bus_clk_recalc(struct clk *clk) 42{ 43 int idx = (ctrl_inl(FRQCR) & 0x000f); 44 clk->rate = clk->parent->rate / bfc_divisors[idx]; 45} 46 47static struct clk_ops sh7770_bus_clk_ops = { 48 .recalc = bus_clk_recalc, 49}; 50 51static void cpu_clk_recalc(struct clk *clk) 52{ 53 int idx = ((ctrl_inl(FRQCR) >> 24) & 0x000f); 54 clk->rate = clk->parent->rate / ifc_divisors[idx]; 55} 56 57static struct clk_ops sh7770_cpu_clk_ops = { 58 .recalc = cpu_clk_recalc, 59}; 60 61static struct clk_ops *sh7770_clk_ops[] = { 62 &sh7770_master_clk_ops, 63 &sh7770_module_clk_ops, 64 &sh7770_bus_clk_ops, 65 &sh7770_cpu_clk_ops, 66}; 67 68void __init arch_init_clk_ops(struct clk_ops **ops, int idx) 69{ 70 if (idx < ARRAY_SIZE(sh7770_clk_ops)) 71 *ops = sh7770_clk_ops[idx]; 72} 73