1 /*
2  * arch/sh/kernel/cpu/sh2a/clock-sh7203.c
3  *
4  * SH7203 support for the clock framework
5  *
6  *  Copyright (C) 2007 Kieran Bingham (MPC-Data Ltd)
7  *
8  * Based on clock-sh7263.c
9  *  Copyright (C) 2006  Yoshinori Sato
10  *
11  * Based on clock-sh4.c
12  *  Copyright (C) 2005  Paul Mundt
13  *
14  * This file is subject to the terms and conditions of the GNU General Public
15  * License.  See the file "COPYING" in the main directory of this archive
16  * for more details.
17  */
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <asm/clock.h>
21 #include <asm/freq.h>
22 #include <asm/io.h>
23 
24 static const int pll1rate[]={8,12,16,0};
25 static const int pfc_divisors[]={1,2,3,4,6,8,12};
26 #define ifc_divisors pfc_divisors
27 
28 #if (CONFIG_SH_CLK_MD == 0)
29 #define PLL2 (1)
30 #elif (CONFIG_SH_CLK_MD == 1)
31 #define PLL2 (2)
32 #elif (CONFIG_SH_CLK_MD == 2)
33 #define PLL2 (4)
34 #elif (CONFIG_SH_CLK_MD == 3)
35 #define PLL2 (4)
36 #else
37 #error "Illegal Clock Mode!"
38 #endif
39 
40 static void master_clk_init(struct clk *clk)
41 {
42 	clk->rate *= pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0003] * PLL2 ;
43 }
44 
45 static struct clk_ops sh7203_master_clk_ops = {
46 	.init		= master_clk_init,
47 };
48 
49 static unsigned long module_clk_recalc(struct clk *clk)
50 {
51 	int idx = (ctrl_inw(FREQCR) & 0x0007);
52 	return clk->parent->rate / pfc_divisors[idx];
53 }
54 
55 static struct clk_ops sh7203_module_clk_ops = {
56 	.recalc		= module_clk_recalc,
57 };
58 
59 static unsigned long bus_clk_recalc(struct clk *clk)
60 {
61 	int idx = (ctrl_inw(FREQCR) & 0x0007);
62 	return clk->parent->rate / pfc_divisors[idx-2];
63 }
64 
65 static struct clk_ops sh7203_bus_clk_ops = {
66 	.recalc		= bus_clk_recalc,
67 };
68 
69 static struct clk_ops sh7203_cpu_clk_ops = {
70 	.recalc		= followparent_recalc,
71 };
72 
73 static struct clk_ops *sh7203_clk_ops[] = {
74 	&sh7203_master_clk_ops,
75 	&sh7203_module_clk_ops,
76 	&sh7203_bus_clk_ops,
77 	&sh7203_cpu_clk_ops,
78 };
79 
80 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
81 {
82 	if (idx < ARRAY_SIZE(sh7203_clk_ops))
83 		*ops = sh7203_clk_ops[idx];
84 }
85