1/* 2 * arch/sh/kernel/cpu/sh3/clock-sh7710.c 3 * 4 * SH7710 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 25static int md_table[] = { 1, 2, 3, 4, 6, 8, 12 }; 26 27static void master_clk_init(struct clk *clk) 28{ 29 clk->rate *= md_table[__raw_readw(FRQCR) & 0x0007]; 30} 31 32static struct clk_ops sh7710_master_clk_ops = { 33 .init = master_clk_init, 34}; 35 36static unsigned long module_clk_recalc(struct clk *clk) 37{ 38 int idx = (__raw_readw(FRQCR) & 0x0007); 39 return clk->parent->rate / md_table[idx]; 40} 41 42static struct clk_ops sh7710_module_clk_ops = { 43 .recalc = module_clk_recalc, 44}; 45 46static unsigned long bus_clk_recalc(struct clk *clk) 47{ 48 int idx = (__raw_readw(FRQCR) & 0x0700) >> 8; 49 return clk->parent->rate / md_table[idx]; 50} 51 52static struct clk_ops sh7710_bus_clk_ops = { 53 .recalc = bus_clk_recalc, 54}; 55 56static unsigned long cpu_clk_recalc(struct clk *clk) 57{ 58 int idx = (__raw_readw(FRQCR) & 0x0070) >> 4; 59 return clk->parent->rate / md_table[idx]; 60} 61 62static struct clk_ops sh7710_cpu_clk_ops = { 63 .recalc = cpu_clk_recalc, 64}; 65 66static struct clk_ops *sh7710_clk_ops[] = { 67 &sh7710_master_clk_ops, 68 &sh7710_module_clk_ops, 69 &sh7710_bus_clk_ops, 70 &sh7710_cpu_clk_ops, 71}; 72 73void __init arch_init_clk_ops(struct clk_ops **ops, int idx) 74{ 75 if (idx < ARRAY_SIZE(sh7710_clk_ops)) 76 *ops = sh7710_clk_ops[idx]; 77} 78