1 /* 2 * arch/sh/kernel/cpu/sh3/clock-sh7712.c 3 * 4 * SH7712 support for the clock framework 5 * 6 * Copyright (C) 2007 Andrew Murray <amurray@mpc-data.co.uk> 7 * 8 * Based on arch/sh/kernel/cpu/sh3/clock-sh3.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 multipliers[] = { 1, 2, 3 }; 22 static int divisors[] = { 1, 2, 3, 4, 6 }; 23 24 static void master_clk_init(struct clk *clk) 25 { 26 int frqcr = __raw_readw(FRQCR); 27 int idx = (frqcr & 0x0300) >> 8; 28 29 clk->rate *= multipliers[idx]; 30 } 31 32 static struct sh_clk_ops sh7712_master_clk_ops = { 33 .init = master_clk_init, 34 }; 35 36 static unsigned long module_clk_recalc(struct clk *clk) 37 { 38 int frqcr = __raw_readw(FRQCR); 39 int idx = frqcr & 0x0007; 40 41 return clk->parent->rate / divisors[idx]; 42 } 43 44 static struct sh_clk_ops sh7712_module_clk_ops = { 45 .recalc = module_clk_recalc, 46 }; 47 48 static unsigned long cpu_clk_recalc(struct clk *clk) 49 { 50 int frqcr = __raw_readw(FRQCR); 51 int idx = (frqcr & 0x0030) >> 4; 52 53 return clk->parent->rate / divisors[idx]; 54 } 55 56 static struct sh_clk_ops sh7712_cpu_clk_ops = { 57 .recalc = cpu_clk_recalc, 58 }; 59 60 static struct sh_clk_ops *sh7712_clk_ops[] = { 61 &sh7712_master_clk_ops, 62 &sh7712_module_clk_ops, 63 &sh7712_cpu_clk_ops, 64 }; 65 66 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) 67 { 68 if (idx < ARRAY_SIZE(sh7712_clk_ops)) 69 *ops = sh7712_clk_ops[idx]; 70 } 71 72