1 /*
2  * arch/sh/kernel/cpu/sh2a/clock-sh7201.c
3  *
4  * SH7201 support for the clock framework
5  *
6  *  Copyright (C) 2008 Peter Griffin  <pgriffin@mpc-data.co.uk>
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 <asm/clock.h>
18 #include <asm/freq.h>
19 #include <asm/io.h>
20 
21 static const int pll1rate[]={1,2,3,4,6,8};
22 static const int pfc_divisors[]={1,2,3,4,6,8,12};
23 #define ifc_divisors pfc_divisors
24 
25 #if (CONFIG_SH_CLK_MD == 0)
26 #define PLL2 (4)
27 #elif (CONFIG_SH_CLK_MD == 2)
28 #define PLL2 (2)
29 #elif (CONFIG_SH_CLK_MD == 3)
30 #define PLL2 (1)
31 #else
32 #error "Illegal Clock Mode!"
33 #endif
34 
35 static void master_clk_init(struct clk *clk)
36 {
37 	clk->rate = 10000000 * PLL2 * pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0007];
38 }
39 
40 static struct clk_ops sh7201_master_clk_ops = {
41 	.init		= master_clk_init,
42 };
43 
44 static void module_clk_recalc(struct clk *clk)
45 {
46 	int idx = (ctrl_inw(FREQCR) & 0x0007);
47 	clk->rate = clk->parent->rate / pfc_divisors[idx];
48 }
49 
50 static struct clk_ops sh7201_module_clk_ops = {
51 	.recalc		= module_clk_recalc,
52 };
53 
54 static void bus_clk_recalc(struct clk *clk)
55 {
56 	int idx = (ctrl_inw(FREQCR) & 0x0007);
57 	clk->rate = clk->parent->rate / pfc_divisors[idx];
58 }
59 
60 static struct clk_ops sh7201_bus_clk_ops = {
61 	.recalc		= bus_clk_recalc,
62 };
63 
64 static void cpu_clk_recalc(struct clk *clk)
65 {
66 	int idx = ((ctrl_inw(FREQCR) >> 4) & 0x0007);
67 	clk->rate = clk->parent->rate / ifc_divisors[idx];
68 }
69 
70 static struct clk_ops sh7201_cpu_clk_ops = {
71 	.recalc		= cpu_clk_recalc,
72 };
73 
74 static struct clk_ops *sh7201_clk_ops[] = {
75 	&sh7201_master_clk_ops,
76 	&sh7201_module_clk_ops,
77 	&sh7201_bus_clk_ops,
78 	&sh7201_cpu_clk_ops,
79 };
80 
81 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
82 {
83 	if (idx < ARRAY_SIZE(sh7201_clk_ops))
84 		*ops = sh7201_clk_ops[idx];
85 }
86