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
master_clk_init(struct clk * clk)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
module_clk_recalc(struct clk * clk)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
bus_clk_recalc(struct clk * clk)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
cpu_clk_recalc(struct clk * clk)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
arch_init_clk_ops(struct sh_clk_ops ** ops,int idx)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
