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clock-sh7710.c
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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 <[email protected]>
12  * Copyright (C) 2002, 2003, 2004 Paul Mundt
13  * Copyright (C) 2002 M. R. Brown <[email protected]>
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