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9d4436a6 YS |
1 | /* |
2 | * arch/sh/kernel/cpu/sh2/clock-sh7619.c | |
3 | * | |
4 | * SH7619 support for the clock framework | |
5 | * | |
6 | * Copyright (C) 2006 Yoshinori Sato | |
7 | * | |
8 | * Based on clock-sh4.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 | ||
c5a69d57 TK |
21 | static const int pll1rate[] = {1,2}; |
22 | static const int pfc_divisors[] = {1,2,0,4}; | |
9d4436a6 YS |
23 | |
24 | #if (CONFIG_SH_CLK_MD == 1) || (CONFIG_SH_CLK_MD == 2) | |
25 | #define PLL2 (4) | |
26 | #elif (CONFIG_SH_CLK_MD == 5) || (CONFIG_SH_CLK_MD == 6) | |
27 | #define PLL2 (2) | |
28 | #else | |
29 | #error "Illigal Clock Mode!" | |
30 | #endif | |
31 | ||
32 | static void master_clk_init(struct clk *clk) | |
33 | { | |
34 | clk->rate *= PLL2 * pll1rate[(ctrl_inw(FREQCR) >> 8) & 7]; | |
35 | } | |
36 | ||
37 | static struct clk_ops sh7619_master_clk_ops = { | |
38 | .init = master_clk_init, | |
39 | }; | |
40 | ||
41 | static void module_clk_recalc(struct clk *clk) | |
42 | { | |
43 | int idx = (ctrl_inw(FREQCR) & 0x0007); | |
44 | clk->rate = clk->parent->rate / pfc_divisors[idx]; | |
45 | } | |
46 | ||
47 | static struct clk_ops sh7619_module_clk_ops = { | |
48 | .recalc = module_clk_recalc, | |
49 | }; | |
50 | ||
51 | static void bus_clk_recalc(struct clk *clk) | |
52 | { | |
53 | clk->rate = clk->parent->rate / pll1rate[(ctrl_inw(FREQCR) >> 8) & 7]; | |
54 | } | |
55 | ||
56 | static struct clk_ops sh7619_bus_clk_ops = { | |
57 | .recalc = bus_clk_recalc, | |
58 | }; | |
59 | ||
60 | static void cpu_clk_recalc(struct clk *clk) | |
61 | { | |
62 | clk->rate = clk->parent->rate; | |
63 | } | |
64 | ||
65 | static struct clk_ops sh7619_cpu_clk_ops = { | |
66 | .recalc = cpu_clk_recalc, | |
67 | }; | |
68 | ||
69 | static struct clk_ops *sh7619_clk_ops[] = { | |
70 | &sh7619_master_clk_ops, | |
71 | &sh7619_module_clk_ops, | |
72 | &sh7619_bus_clk_ops, | |
73 | &sh7619_cpu_clk_ops, | |
74 | }; | |
75 | ||
76 | void __init arch_init_clk_ops(struct clk_ops **ops, int idx) | |
77 | { | |
78 | if (idx < ARRAY_SIZE(sh7619_clk_ops)) | |
79 | *ops = sh7619_clk_ops[idx]; | |
80 | } | |
81 |