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36ddf31b | 1 | /* |
58862699 | 2 | * arch/sh/kernel/cpu/sh4a/clock-sh7770.c |
36ddf31b PM |
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 | ||
22 | static void master_clk_init(struct clk *clk) | |
23 | { | |
9d56dd3b | 24 | clk->rate *= pfc_divisors[(__raw_readl(FRQCR) >> 28) & 0x000f]; |
36ddf31b PM |
25 | } |
26 | ||
27 | static struct clk_ops sh7770_master_clk_ops = { | |
28 | .init = master_clk_init, | |
29 | }; | |
30 | ||
b68d8201 | 31 | static unsigned long module_clk_recalc(struct clk *clk) |
36ddf31b | 32 | { |
9d56dd3b | 33 | int idx = ((__raw_readl(FRQCR) >> 28) & 0x000f); |
b68d8201 | 34 | return clk->parent->rate / pfc_divisors[idx]; |
36ddf31b PM |
35 | } |
36 | ||
37 | static struct clk_ops sh7770_module_clk_ops = { | |
38 | .recalc = module_clk_recalc, | |
39 | }; | |
40 | ||
b68d8201 | 41 | static unsigned long bus_clk_recalc(struct clk *clk) |
36ddf31b | 42 | { |
9d56dd3b | 43 | int idx = (__raw_readl(FRQCR) & 0x000f); |
b68d8201 | 44 | return clk->parent->rate / bfc_divisors[idx]; |
36ddf31b PM |
45 | } |
46 | ||
47 | static struct clk_ops sh7770_bus_clk_ops = { | |
48 | .recalc = bus_clk_recalc, | |
49 | }; | |
50 | ||
b68d8201 | 51 | static unsigned long cpu_clk_recalc(struct clk *clk) |
36ddf31b | 52 | { |
9d56dd3b | 53 | int idx = ((__raw_readl(FRQCR) >> 24) & 0x000f); |
b68d8201 | 54 | return clk->parent->rate / ifc_divisors[idx]; |
36ddf31b PM |
55 | } |
56 | ||
57 | static struct clk_ops sh7770_cpu_clk_ops = { | |
58 | .recalc = cpu_clk_recalc, | |
59 | }; | |
60 | ||
61 | static struct 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 | ||
68 | void __init arch_init_clk_ops(struct clk_ops **ops, int idx) | |
69 | { | |
70 | if (idx < ARRAY_SIZE(sh7770_clk_ops)) | |
71 | *ops = sh7770_clk_ops[idx]; | |
72 | } | |
73 |