Linux 3.14.25
[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / arm / mach-shmobile / clock-r7s72100.c
1 /*
2  * r7a72100 clock framework support
3  *
4  * Copyright (C) 2013  Renesas Solutions Corp.
5  * Copyright (C) 2012  Phil Edworthy
6  * Copyright (C) 2011  Magnus Damm
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; version 2 of the License.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/io.h>
20 #include <linux/sh_clk.h>
21 #include <linux/clkdev.h>
22 #include <mach/common.h>
23 #include <mach/r7s72100.h>
24
25 /* registers */
26 #define FRQCR           0xfcfe0010
27 #define FRQCR2          0xfcfe0014
28 #define STBCR3          0xfcfe0420
29 #define STBCR4          0xfcfe0424
30 #define STBCR9          0xfcfe0438
31
32 #define PLL_RATE 30
33
34 static struct clk_mapping cpg_mapping = {
35         .phys   = 0xfcfe0000,
36         .len    = 0x1000,
37 };
38
39 /* Fixed 32 KHz root clock for RTC */
40 static struct clk r_clk = {
41         .rate           = 32768,
42 };
43
44 /*
45  * Default rate for the root input clock, reset this with clk_set_rate()
46  * from the platform code.
47  */
48 static struct clk extal_clk = {
49         .rate           = 13330000,
50         .mapping        = &cpg_mapping,
51 };
52
53 static unsigned long pll_recalc(struct clk *clk)
54 {
55         return clk->parent->rate * PLL_RATE;
56 }
57
58 static struct sh_clk_ops pll_clk_ops = {
59         .recalc         = pll_recalc,
60 };
61
62 static struct clk pll_clk = {
63         .ops            = &pll_clk_ops,
64         .parent         = &extal_clk,
65         .flags          = CLK_ENABLE_ON_INIT,
66 };
67
68 static unsigned long bus_recalc(struct clk *clk)
69 {
70         return clk->parent->rate * 2 / 3;
71 }
72
73 static struct sh_clk_ops bus_clk_ops = {
74         .recalc         = bus_recalc,
75 };
76
77 static struct clk bus_clk = {
78         .ops            = &bus_clk_ops,
79         .parent         = &pll_clk,
80         .flags          = CLK_ENABLE_ON_INIT,
81 };
82
83 static unsigned long peripheral0_recalc(struct clk *clk)
84 {
85         return clk->parent->rate / 12;
86 }
87
88 static struct sh_clk_ops peripheral0_clk_ops = {
89         .recalc         = peripheral0_recalc,
90 };
91
92 static struct clk peripheral0_clk = {
93         .ops            = &peripheral0_clk_ops,
94         .parent         = &pll_clk,
95         .flags          = CLK_ENABLE_ON_INIT,
96 };
97
98 static unsigned long peripheral1_recalc(struct clk *clk)
99 {
100         return clk->parent->rate / 6;
101 }
102
103 static struct sh_clk_ops peripheral1_clk_ops = {
104         .recalc         = peripheral1_recalc,
105 };
106
107 static struct clk peripheral1_clk = {
108         .ops            = &peripheral1_clk_ops,
109         .parent         = &pll_clk,
110         .flags          = CLK_ENABLE_ON_INIT,
111 };
112
113 struct clk *main_clks[] = {
114         &r_clk,
115         &extal_clk,
116         &pll_clk,
117         &bus_clk,
118         &peripheral0_clk,
119         &peripheral1_clk,
120 };
121
122 static int div2[] = { 1, 3, 0, 3 }; /* 1, 2/3, reserve, 1/3 */
123 static int multipliers[] = { 1, 2, 1, 1 };
124
125 static struct clk_div_mult_table div4_div_mult_table = {
126         .divisors = div2,
127         .nr_divisors = ARRAY_SIZE(div2),
128         .multipliers = multipliers,
129         .nr_multipliers = ARRAY_SIZE(multipliers),
130 };
131
132 static struct clk_div4_table div4_table = {
133         .div_mult_table = &div4_div_mult_table,
134 };
135
136 enum { DIV4_I,
137         DIV4_NR };
138
139 #define DIV4(_reg, _bit, _mask, _flags) \
140         SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
141
142 /* The mask field specifies the div2 entries that are valid */
143 struct clk div4_clks[DIV4_NR] = {
144         [DIV4_I]  = DIV4(FRQCR, 8, 0xB, CLK_ENABLE_REG_16BIT
145                                         | CLK_ENABLE_ON_INIT),
146 };
147
148 enum {  MSTP97, MSTP96, MSTP95, MSTP94,
149         MSTP47, MSTP46, MSTP45, MSTP44, MSTP43, MSTP42, MSTP41, MSTP40,
150         MSTP33, MSTP_NR };
151
152 static struct clk mstp_clks[MSTP_NR] = {
153         [MSTP97] = SH_CLK_MSTP8(&peripheral0_clk, STBCR9, 7, 0), /* RIIC0 */
154         [MSTP96] = SH_CLK_MSTP8(&peripheral0_clk, STBCR9, 6, 0), /* RIIC1 */
155         [MSTP95] = SH_CLK_MSTP8(&peripheral0_clk, STBCR9, 5, 0), /* RIIC2 */
156         [MSTP94] = SH_CLK_MSTP8(&peripheral0_clk, STBCR9, 4, 0), /* RIIC3 */
157         [MSTP47] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 7, 0), /* SCIF0 */
158         [MSTP46] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 6, 0), /* SCIF1 */
159         [MSTP45] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 5, 0), /* SCIF2 */
160         [MSTP44] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 4, 0), /* SCIF3 */
161         [MSTP43] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 3, 0), /* SCIF4 */
162         [MSTP42] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 2, 0), /* SCIF5 */
163         [MSTP41] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 1, 0), /* SCIF6 */
164         [MSTP40] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 0, 0), /* SCIF7 */
165         [MSTP33] = SH_CLK_MSTP8(&peripheral0_clk, STBCR3, 3, 0), /* MTU2 */
166 };
167
168 static struct clk_lookup lookups[] = {
169         /* main clocks */
170         CLKDEV_CON_ID("rclk", &r_clk),
171         CLKDEV_CON_ID("extal", &extal_clk),
172         CLKDEV_CON_ID("pll_clk", &pll_clk),
173         CLKDEV_CON_ID("peripheral_clk", &peripheral1_clk),
174
175         /* DIV4 clocks */
176         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
177
178         /* MSTP clocks */
179         CLKDEV_CON_ID("mtu2_fck", &mstp_clks[MSTP33]),
180
181         /* ICK */
182         CLKDEV_ICK_ID("sci_fck", "sh-sci.0", &mstp_clks[MSTP47]),
183         CLKDEV_ICK_ID("sci_fck", "sh-sci.1", &mstp_clks[MSTP46]),
184         CLKDEV_ICK_ID("sci_fck", "sh-sci.2", &mstp_clks[MSTP45]),
185         CLKDEV_ICK_ID("sci_fck", "sh-sci.3", &mstp_clks[MSTP44]),
186         CLKDEV_ICK_ID("sci_fck", "sh-sci.4", &mstp_clks[MSTP43]),
187         CLKDEV_ICK_ID("sci_fck", "sh-sci.5", &mstp_clks[MSTP42]),
188         CLKDEV_ICK_ID("sci_fck", "sh-sci.6", &mstp_clks[MSTP41]),
189         CLKDEV_ICK_ID("sci_fck", "sh-sci.7", &mstp_clks[MSTP40]),
190 };
191
192 void __init r7s72100_clock_init(void)
193 {
194         int k, ret = 0;
195
196         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
197                 ret = clk_register(main_clks[k]);
198
199         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
200
201         if (!ret)
202                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
203
204         if (!ret)
205                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
206
207         if (!ret)
208                 shmobile_clk_init();
209         else
210                 panic("failed to setup rza1 clocks\n");
211 }