Linux Kernel  3.7.1
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clock-sh7619.c
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1 /*
2  * arch/sh/kernel/cpu/sh2/clock-sh7619.c
3  *
4  * SH7619 support for the clock framework
5  *
6  * Copyright (C) 2006 Yoshinori Sato
7  *
8  * Based on clock-sh4.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 <linux/io.h>
18 #include <asm/clock.h>
19 #include <asm/freq.h>
20 #include <asm/processor.h>
21 
22 static const int pll1rate[] = {1,2};
23 static const int pfc_divisors[] = {1,2,0,4};
24 static unsigned int pll2_mult;
25 
26 static void master_clk_init(struct clk *clk)
27 {
28  clk->rate *= pll2_mult * pll1rate[(__raw_readw(FREQCR) >> 8) & 7];
29 }
30 
31 static struct sh_clk_ops sh7619_master_clk_ops = {
32  .init = master_clk_init,
33 };
34 
35 static unsigned long module_clk_recalc(struct clk *clk)
36 {
37  int idx = (__raw_readw(FREQCR) & 0x0007);
38  return clk->parent->rate / pfc_divisors[idx];
39 }
40 
41 static struct sh_clk_ops sh7619_module_clk_ops = {
42  .recalc = module_clk_recalc,
43 };
44 
45 static unsigned long bus_clk_recalc(struct clk *clk)
46 {
47  return clk->parent->rate / pll1rate[(__raw_readw(FREQCR) >> 8) & 7];
48 }
49 
50 static struct sh_clk_ops sh7619_bus_clk_ops = {
51  .recalc = bus_clk_recalc,
52 };
53 
54 static struct sh_clk_ops sh7619_cpu_clk_ops = {
55  .recalc = followparent_recalc,
56 };
57 
58 static struct sh_clk_ops *sh7619_clk_ops[] = {
59  &sh7619_master_clk_ops,
60  &sh7619_module_clk_ops,
61  &sh7619_bus_clk_ops,
62  &sh7619_cpu_clk_ops,
63 };
64 
65 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
66 {
69  pll2_mult = 2;
71  pll2_mult = 4;
72 
73  BUG_ON(!pll2_mult);
74 
75  if (idx < ARRAY_SIZE(sh7619_clk_ops))
76  *ops = sh7619_clk_ops[idx];
77 }