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 25 static int md_table[] = { 1, 2, 3, 4, 6, 8, 12 }; 26 27 static void master_clk_init(struct clk *clk) 28 { 29 clk->rate *= md_table[__raw_readw(FRQCR) & 0x0007]; 30 } 31 32 static struct sh_clk_ops sh7710_master_clk_ops = { 33 .init = master_clk_init, 34 }; 35 36 static 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 42 static struct sh_clk_ops sh7710_module_clk_ops = { 43 .recalc = module_clk_recalc, 44 }; 45 46 static 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 52 static struct sh_clk_ops sh7710_bus_clk_ops = { 53 .recalc = bus_clk_recalc, 54 }; 55 56 static 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 62 static struct sh_clk_ops sh7710_cpu_clk_ops = { 63 .recalc = cpu_clk_recalc, 64 }; 65 66 static struct sh_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 73 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) 74 { 75 if (idx < ARRAY_SIZE(sh7710_clk_ops)) 76 *ops = sh7710_clk_ops[idx]; 77 } 78 79