1 /*
2 * arch/sh/kernel/cpu/sh2a/clock-sh7269.c
3 *
4 * SH7269 clock framework support
5 *
6 * Copyright (C) 2012 Phil Edworthy
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 <linux/io.h>
15 #include <linux/clkdev.h>
16 #include <asm/clock.h>
17
18 /* SH7269 registers */
19 #define FRQCR 0xfffe0010
20 #define STBCR3 0xfffe0408
21 #define STBCR4 0xfffe040c
22 #define STBCR5 0xfffe0410
23 #define STBCR6 0xfffe0414
24 #define STBCR7 0xfffe0418
25
26 #define PLL_RATE 20
27
28 /* Fixed 32 KHz root clock for RTC */
29 static struct clk r_clk = {
30 .rate = 32768,
31 };
32
33 /*
34 * Default rate for the root input clock, reset this with clk_set_rate()
35 * from the platform code.
36 */
37 static struct clk extal_clk = {
38 .rate = 13340000,
39 };
40
pll_recalc(struct clk * clk)41 static unsigned long pll_recalc(struct clk *clk)
42 {
43 return clk->parent->rate * PLL_RATE;
44 }
45
46 static struct sh_clk_ops pll_clk_ops = {
47 .recalc = pll_recalc,
48 };
49
50 static struct clk pll_clk = {
51 .ops = &pll_clk_ops,
52 .parent = &extal_clk,
53 .flags = CLK_ENABLE_ON_INIT,
54 };
55
peripheral0_recalc(struct clk * clk)56 static unsigned long peripheral0_recalc(struct clk *clk)
57 {
58 return clk->parent->rate / 8;
59 }
60
61 static struct sh_clk_ops peripheral0_clk_ops = {
62 .recalc = peripheral0_recalc,
63 };
64
65 static struct clk peripheral0_clk = {
66 .ops = &peripheral0_clk_ops,
67 .parent = &pll_clk,
68 .flags = CLK_ENABLE_ON_INIT,
69 };
70
peripheral1_recalc(struct clk * clk)71 static unsigned long peripheral1_recalc(struct clk *clk)
72 {
73 return clk->parent->rate / 4;
74 }
75
76 static struct sh_clk_ops peripheral1_clk_ops = {
77 .recalc = peripheral1_recalc,
78 };
79
80 static struct clk peripheral1_clk = {
81 .ops = &peripheral1_clk_ops,
82 .parent = &pll_clk,
83 .flags = CLK_ENABLE_ON_INIT,
84 };
85
86 struct clk *main_clks[] = {
87 &r_clk,
88 &extal_clk,
89 &pll_clk,
90 &peripheral0_clk,
91 &peripheral1_clk,
92 };
93
94 static int div2[] = { 1, 2, 0, 4 };
95
96 static struct clk_div_mult_table div4_div_mult_table = {
97 .divisors = div2,
98 .nr_divisors = ARRAY_SIZE(div2),
99 };
100
101 static struct clk_div4_table div4_table = {
102 .div_mult_table = &div4_div_mult_table,
103 };
104
105 enum { DIV4_I, DIV4_B,
106 DIV4_NR };
107
108 #define DIV4(_reg, _bit, _mask, _flags) \
109 SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
110
111 /* The mask field specifies the div2 entries that are valid */
112 struct clk div4_clks[DIV4_NR] = {
113 [DIV4_I] = DIV4(FRQCR, 8, 0xB, CLK_ENABLE_REG_16BIT
114 | CLK_ENABLE_ON_INIT),
115 [DIV4_B] = DIV4(FRQCR, 4, 0xA, CLK_ENABLE_REG_16BIT
116 | CLK_ENABLE_ON_INIT),
117 };
118
119 enum { MSTP72,
120 MSTP60,
121 MSTP47, MSTP46, MSTP45, MSTP44, MSTP43, MSTP42, MSTP41, MSTP40,
122 MSTP35, MSTP32, MSTP30,
123 MSTP_NR };
124
125 static struct clk mstp_clks[MSTP_NR] = {
126 [MSTP72] = SH_CLK_MSTP8(&peripheral0_clk, STBCR7, 2, 0), /* CMT */
127 [MSTP60] = SH_CLK_MSTP8(&peripheral1_clk, STBCR6, 0, 0), /* USB */
128 [MSTP47] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 7, 0), /* SCIF0 */
129 [MSTP46] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 6, 0), /* SCIF1 */
130 [MSTP45] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 5, 0), /* SCIF2 */
131 [MSTP44] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 4, 0), /* SCIF3 */
132 [MSTP43] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 3, 0), /* SCIF4 */
133 [MSTP42] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 2, 0), /* SCIF5 */
134 [MSTP41] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 1, 0), /* SCIF6 */
135 [MSTP40] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 0, 0), /* SCIF7 */
136 [MSTP35] = SH_CLK_MSTP8(&peripheral0_clk, STBCR3, 5, 0), /* MTU2 */
137 [MSTP32] = SH_CLK_MSTP8(&peripheral1_clk, STBCR3, 2, 0), /* ADC */
138 [MSTP30] = SH_CLK_MSTP8(&r_clk, STBCR3, 0, 0), /* RTC */
139 };
140
141 static struct clk_lookup lookups[] = {
142 /* main clocks */
143 CLKDEV_CON_ID("rclk", &r_clk),
144 CLKDEV_CON_ID("extal", &extal_clk),
145 CLKDEV_CON_ID("pll_clk", &pll_clk),
146 CLKDEV_CON_ID("peripheral_clk", &peripheral1_clk),
147
148 /* DIV4 clocks */
149 CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
150 CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
151
152 /* MSTP clocks */
153 CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP47]),
154 CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP46]),
155 CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP45]),
156 CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP44]),
157 CLKDEV_ICK_ID("fck", "sh-sci.4", &mstp_clks[MSTP43]),
158 CLKDEV_ICK_ID("fck", "sh-sci.5", &mstp_clks[MSTP42]),
159 CLKDEV_ICK_ID("fck", "sh-sci.6", &mstp_clks[MSTP41]),
160 CLKDEV_ICK_ID("fck", "sh-sci.7", &mstp_clks[MSTP40]),
161 CLKDEV_ICK_ID("fck", "sh-cmt-16.0", &mstp_clks[MSTP72]),
162 CLKDEV_CON_ID("usb0", &mstp_clks[MSTP60]),
163 CLKDEV_ICK_ID("fck", "sh-mtu2", &mstp_clks[MSTP35]),
164 CLKDEV_CON_ID("adc0", &mstp_clks[MSTP32]),
165 CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP30]),
166 };
167
arch_clk_init(void)168 int __init arch_clk_init(void)
169 {
170 int k, ret = 0;
171
172 for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
173 ret = clk_register(main_clks[k]);
174
175 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
176
177 if (!ret)
178 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
179
180 if (!ret)
181 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
182
183 return ret;
184 }
185
