2 * arch/sh/kernel/cpu/sh3/clock-sh7706.c
4 * SH7706 support for the clock framework
6 * Copyright (C) 2006 Takashi YOSHII
8 * Based on arch/sh/kernel/cpu/sh3/clock-sh7709.c
9 * Copyright (C) 2005 Andriy Skulysh
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
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <asm/clock.h>
21 static int stc_multipliers[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
22 static int ifc_divisors[] = { 1, 2, 4, 1, 3, 1, 1, 1 };
23 static int pfc_divisors[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
25 static void master_clk_init(struct clk *clk)
27 int frqcr = ctrl_inw(FRQCR);
28 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
30 clk->rate *= pfc_divisors[idx];
33 static struct clk_ops sh7706_master_clk_ops = {
34 .init = master_clk_init,
37 static void module_clk_recalc(struct clk *clk)
39 int frqcr = ctrl_inw(FRQCR);
40 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
42 clk->rate = clk->parent->rate / pfc_divisors[idx];
45 static struct clk_ops sh7706_module_clk_ops = {
46 .recalc = module_clk_recalc,
49 static void bus_clk_recalc(struct clk *clk)
51 int frqcr = ctrl_inw(FRQCR);
52 int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
54 clk->rate = clk->parent->rate / stc_multipliers[idx];
57 static struct clk_ops sh7706_bus_clk_ops = {
58 .recalc = bus_clk_recalc,
61 static void cpu_clk_recalc(struct clk *clk)
63 int frqcr = ctrl_inw(FRQCR);
64 int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
66 clk->rate = clk->parent->rate / ifc_divisors[idx];
69 static struct clk_ops sh7706_cpu_clk_ops = {
70 .recalc = cpu_clk_recalc,
73 static struct clk_ops *sh7706_clk_ops[] = {
74 &sh7706_master_clk_ops,
75 &sh7706_module_clk_ops,
80 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
82 if (idx < ARRAY_SIZE(sh7706_clk_ops))
83 *ops = sh7706_clk_ops[idx];