1 /*
2 * arch/sh/kernel/cpu/sh3/clock-sh7709.c
3 *
4 * SH7709 support for the clock framework
5 *
6 * Copyright (C) 2005 Andriy Skulysh
7 *
8 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.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 int stc_multipliers[] = { 1, 2, 4, 8, 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 clk_ops sh7709_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 clk_ops sh7709_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 & 0x0080) ?
53 ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
54
55 return clk->parent->rate * stc_multipliers[idx];
56 }
57
58 static struct clk_ops sh7709_bus_clk_ops = {
59 .recalc = bus_clk_recalc,
60 };
61
cpu_clk_recalc(struct clk * clk)62 static unsigned long cpu_clk_recalc(struct clk *clk)
63 {
64 int frqcr = __raw_readw(FRQCR);
65 int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
66
67 return clk->parent->rate / ifc_divisors[idx];
68 }
69
70 static struct clk_ops sh7709_cpu_clk_ops = {
71 .recalc = cpu_clk_recalc,
72 };
73
74 static struct clk_ops *sh7709_clk_ops[] = {
75 &sh7709_master_clk_ops,
76 &sh7709_module_clk_ops,
77 &sh7709_bus_clk_ops,
78 &sh7709_cpu_clk_ops,
79 };
80
arch_init_clk_ops(struct clk_ops ** ops,int idx)81 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
82 {
83 if (idx < ARRAY_SIZE(sh7709_clk_ops))
84 *ops = sh7709_clk_ops[idx];
85 }
86