1 /*
2 * arch/sh/kernel/cpu/sh3/clock-sh7706.c
3 *
4 * SH7706 support for the clock framework
5 *
6 * Copyright (C) 2006 Takashi YOSHII
7 *
8 * Based on arch/sh/kernel/cpu/sh3/clock-sh7709.c
9 * Copyright (C) 2005 Andriy Skulysh
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 int stc_multipliers[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
22 static int ifc_divisors[] = { 1, 2, 4, 1, 3, 1, 1, 1 };
23 static int pfc_divisors[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
24
master_clk_init(struct clk * clk)25 static void master_clk_init(struct clk *clk)
26 {
27 int frqcr = __raw_readw(FRQCR);
28 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
29
30 clk->rate *= pfc_divisors[idx];
31 }
32
33 static struct sh_clk_ops sh7706_master_clk_ops = {
34 .init = master_clk_init,
35 };
36
module_clk_recalc(struct clk * clk)37 static unsigned long module_clk_recalc(struct clk *clk)
38 {
39 int frqcr = __raw_readw(FRQCR);
40 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
41
42 return clk->parent->rate / pfc_divisors[idx];
43 }
44
45 static struct sh_clk_ops sh7706_module_clk_ops = {
46 .recalc = module_clk_recalc,
47 };
48
bus_clk_recalc(struct clk * clk)49 static unsigned long bus_clk_recalc(struct clk *clk)
50 {
51 int frqcr = __raw_readw(FRQCR);
52 int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
53
54 return clk->parent->rate / stc_multipliers[idx];
55 }
56
57 static struct sh_clk_ops sh7706_bus_clk_ops = {
58 .recalc = bus_clk_recalc,
59 };
60
cpu_clk_recalc(struct clk * clk)61 static unsigned long cpu_clk_recalc(struct clk *clk)
62 {
63 int frqcr = __raw_readw(FRQCR);
64 int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
65
66 return clk->parent->rate / ifc_divisors[idx];
67 }
68
69 static struct sh_clk_ops sh7706_cpu_clk_ops = {
70 .recalc = cpu_clk_recalc,
71 };
72
73 static struct sh_clk_ops *sh7706_clk_ops[] = {
74 &sh7706_master_clk_ops,
75 &sh7706_module_clk_ops,
76 &sh7706_bus_clk_ops,
77 &sh7706_cpu_clk_ops,
78 };
79
arch_init_clk_ops(struct sh_clk_ops ** ops,int idx)80 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
81 {
82 if (idx < ARRAY_SIZE(sh7706_clk_ops))
83 *ops = sh7706_clk_ops[idx];
84 }
85
