1/* 2 * arch/sh/kernel/cpu/sh4a/clock-sh73180.c 3 * 4 * SH73180 support for the clock framework 5 * 6 * Copyright (C) 2005 Paul Mundt 7 * 8 * FRQCR parsing hacked out of arch/sh/kernel/time.c 9 * 10 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka 11 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> 12 * Copyright (C) 2002, 2003, 2004 Paul Mundt 13 * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org> 14 * 15 * This file is subject to the terms and conditions of the GNU General Public 16 * License. See the file "COPYING" in the main directory of this archive 17 * for more details. 18 */ 19#include <linux/init.h> 20#include <linux/kernel.h> 21#include <asm/clock.h> 22#include <asm/freq.h> 23#include <asm/io.h> 24 25/* 26 * SH73180 uses a common set of divisors, so this is quite simple.. 27 */ 28static int divisors[] = { 1, 2, 3, 4, 6, 8, 12, 16 }; 29 30static void master_clk_init(struct clk *clk) 31{ 32 clk->rate *= divisors[ctrl_inl(FRQCR) & 0x0007]; 33} 34 35static struct clk_ops sh73180_master_clk_ops = { 36 .init = master_clk_init, 37}; 38 39static void module_clk_recalc(struct clk *clk) 40{ 41 int idx = (ctrl_inl(FRQCR) & 0x0007); 42 clk->rate = clk->parent->rate / divisors[idx]; 43} 44 45static struct clk_ops sh73180_module_clk_ops = { 46 .recalc = module_clk_recalc, 47}; 48 49static void bus_clk_recalc(struct clk *clk) 50{ 51 int idx = (ctrl_inl(FRQCR) >> 12) & 0x0007; 52 clk->rate = clk->parent->rate / divisors[idx]; 53} 54 55static struct clk_ops sh73180_bus_clk_ops = { 56 .recalc = bus_clk_recalc, 57}; 58 59static void cpu_clk_recalc(struct clk *clk) 60{ 61 int idx = (ctrl_inl(FRQCR) >> 20) & 0x0007; 62 clk->rate = clk->parent->rate / divisors[idx]; 63} 64 65static struct clk_ops sh73180_cpu_clk_ops = { 66 .recalc = cpu_clk_recalc, 67}; 68 69static struct clk_ops *sh73180_clk_ops[] = { 70 &sh73180_master_clk_ops, 71 &sh73180_module_clk_ops, 72 &sh73180_bus_clk_ops, 73 &sh73180_cpu_clk_ops, 74}; 75 76void __init arch_init_clk_ops(struct clk_ops **ops, int idx) 77{ 78 if (idx < ARRAY_SIZE(sh73180_clk_ops)) 79 *ops = sh73180_clk_ops[idx]; 80} 81