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 static unsigned int pll2_mult;
29 
30 static void master_clk_init(struct clk *clk)
31 {
32 	clk->rate *= pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0003] * pll2_mult;
33 }
34 
35 static struct sh_clk_ops sh7203_master_clk_ops = {
36 	.init		= master_clk_init,
37 };
38 
39 static unsigned long module_clk_recalc(struct clk *clk)
40 {
41 	int idx = (__raw_readw(FREQCR) & 0x0007);
42 	return clk->parent->rate / pfc_divisors[idx];
43 }
44 
45 static struct sh_clk_ops sh7203_module_clk_ops = {
46 	.recalc		= module_clk_recalc,
47 };
48 
49 static unsigned long bus_clk_recalc(struct clk *clk)
50 {
51 	int idx = (__raw_readw(FREQCR) & 0x0007);
52 	return clk->parent->rate / pfc_divisors[idx-2];
53 }
54 
55 static struct sh_clk_ops sh7203_bus_clk_ops = {
56 	.recalc		= bus_clk_recalc,
57 };
58 
59 static struct sh_clk_ops sh7203_cpu_clk_ops = {
60 	.recalc		= followparent_recalc,
61 };
62 
63 static struct sh_clk_ops *sh7203_clk_ops[] = {
64 	&sh7203_master_clk_ops,
65 	&sh7203_module_clk_ops,
66 	&sh7203_bus_clk_ops,
67 	&sh7203_cpu_clk_ops,
68 };
69 
70 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
71 {
72 	if (test_mode_pin(MODE_PIN1))
73 		pll2_mult = 4;
74 	else if (test_mode_pin(MODE_PIN0))
75 		pll2_mult = 2;
76 	else
77 		pll2_mult = 1;
78 
79 	if (idx < ARRAY_SIZE(sh7203_clk_ops))
80 		*ops = sh7203_clk_ops[idx];
81 }
82