1/* 2 * arch/sh/kernel/cpu/sh2a/clock-sh7203.c 3 * 4 * SH7203 support for the clock framework 5 * 6 * Copyright (C) 2007 Kieran Bingham (MPC-Data Ltd) 7 * 8 * Based on clock-sh7263.c 9 * Copyright (C) 2006 Yoshinori Sato 10 * 11 * Based on clock-sh4.c 12 * Copyright (C) 2005 Paul Mundt 13 * 14 * This file is subject to the terms and conditions of the GNU General Public 15 * License. See the file "COPYING" in the main directory of this archive 16 * for more details. 17 */ 18#include <linux/init.h> 19#include <linux/kernel.h> 20#include <asm/clock.h> 21#include <asm/freq.h> 22#include <asm/io.h> 23 24static const int pll1rate[]={8,12,16,0}; 25static const int pfc_divisors[]={1,2,3,4,6,8,12}; 26#define ifc_divisors pfc_divisors 27 28#if (CONFIG_SH_CLK_MD == 0) 29#define PLL2 (1) 30#elif (CONFIG_SH_CLK_MD == 1) 31#define PLL2 (2) 32#elif (CONFIG_SH_CLK_MD == 2) 33#define PLL2 (4) 34#elif (CONFIG_SH_CLK_MD == 3) 35#define PLL2 (4) 36#else 37#error "Illegal Clock Mode!" 38#endif 39 40static void master_clk_init(struct clk *clk) 41{ 42 clk->rate *= pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0003] * PLL2 ; 43} 44 45static struct clk_ops sh7203_master_clk_ops = { 46 .init = master_clk_init, 47}; 48 49static unsigned long module_clk_recalc(struct clk *clk) 50{ 51 int idx = (__raw_readw(FREQCR) & 0x0007); 52 return clk->parent->rate / pfc_divisors[idx]; 53} 54 55static struct clk_ops sh7203_module_clk_ops = { 56 .recalc = module_clk_recalc, 57}; 58 59static unsigned long bus_clk_recalc(struct clk *clk) 60{ 61 int idx = (__raw_readw(FREQCR) & 0x0007); 62 return clk->parent->rate / pfc_divisors[idx-2]; 63} 64 65static struct clk_ops sh7203_bus_clk_ops = { 66 .recalc = bus_clk_recalc, 67}; 68 69static struct clk_ops sh7203_cpu_clk_ops = { 70 .recalc = followparent_recalc, 71}; 72 73static struct clk_ops *sh7203_clk_ops[] = { 74 &sh7203_master_clk_ops, 75 &sh7203_module_clk_ops, 76 &sh7203_bus_clk_ops, 77 &sh7203_cpu_clk_ops, 78}; 79 80void __init arch_init_clk_ops(struct clk_ops **ops, int idx) 81{ 82 if (idx < ARRAY_SIZE(sh7203_clk_ops)) 83 *ops = sh7203_clk_ops[idx]; 84} 85