1 /*
2 * arch/sh/kernel/cpu/sh4a/clock-sh7770.c
3 *
4 * SH7770 support for the clock framework
5 *
6 * Copyright (C) 2005 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <asm/clock.h>
15 #include <asm/freq.h>
16 #include <asm/io.h>
17
18 static int ifc_divisors[] = { 1, 1, 1, 1, 1, 1, 1, 1 };
19 static int bfc_divisors[] = { 1, 1, 1, 1, 1, 8,12, 1 };
20 static int pfc_divisors[] = { 1, 8, 1,10,12,16, 1, 1 };
21
master_clk_init(struct clk * clk)22 static void master_clk_init(struct clk *clk)
23 {
24 clk->rate *= pfc_divisors[(__raw_readl(FRQCR) >> 28) & 0x000f];
25 }
26
27 static struct sh_clk_ops sh7770_master_clk_ops = {
28 .init = master_clk_init,
29 };
30
module_clk_recalc(struct clk * clk)31 static unsigned long module_clk_recalc(struct clk *clk)
32 {
33 int idx = ((__raw_readl(FRQCR) >> 28) & 0x000f);
34 return clk->parent->rate / pfc_divisors[idx];
35 }
36
37 static struct sh_clk_ops sh7770_module_clk_ops = {
38 .recalc = module_clk_recalc,
39 };
40
bus_clk_recalc(struct clk * clk)41 static unsigned long bus_clk_recalc(struct clk *clk)
42 {
43 int idx = (__raw_readl(FRQCR) & 0x000f);
44 return clk->parent->rate / bfc_divisors[idx];
45 }
46
47 static struct sh_clk_ops sh7770_bus_clk_ops = {
48 .recalc = bus_clk_recalc,
49 };
50
cpu_clk_recalc(struct clk * clk)51 static unsigned long cpu_clk_recalc(struct clk *clk)
52 {
53 int idx = ((__raw_readl(FRQCR) >> 24) & 0x000f);
54 return clk->parent->rate / ifc_divisors[idx];
55 }
56
57 static struct sh_clk_ops sh7770_cpu_clk_ops = {
58 .recalc = cpu_clk_recalc,
59 };
60
61 static struct sh_clk_ops *sh7770_clk_ops[] = {
62 &sh7770_master_clk_ops,
63 &sh7770_module_clk_ops,
64 &sh7770_bus_clk_ops,
65 &sh7770_cpu_clk_ops,
66 };
67
arch_init_clk_ops(struct sh_clk_ops ** ops,int idx)68 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
69 {
70 if (idx < ARRAY_SIZE(sh7770_clk_ops))
71 *ops = sh7770_clk_ops[idx];
72 }
73
74