1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh2a/clock-sh7269.c
4 *
5 * SH7269 clock framework support
6 *
7 * Copyright (C) 2012 Phil Edworthy
8 */
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/io.h>
12 #include <linux/clkdev.h>
13 #include <asm/clock.h>
14
15 /* SH7269 registers */
16 #define FRQCR 0xfffe0010
17 #define STBCR3 0xfffe0408
18 #define STBCR4 0xfffe040c
19 #define STBCR5 0xfffe0410
20 #define STBCR6 0xfffe0414
21 #define STBCR7 0xfffe0418
22
23 #define PLL_RATE 20
24
25 /* Fixed 32 KHz root clock for RTC */
26 static struct clk r_clk = {
27 .rate = 32768,
28 };
29
30 /*
31 * Default rate for the root input clock, reset this with clk_set_rate()
32 * from the platform code.
33 */
34 static struct clk extal_clk = {
35 .rate = 13340000,
36 };
37
38 static unsigned long pll_recalc(struct clk *clk)
39 {
40 return clk->parent->rate * PLL_RATE;
41 }
42
43 static struct sh_clk_ops pll_clk_ops = {
44 .recalc = pll_recalc,
45 };
46
47 static struct clk pll_clk = {
48 .ops = &pll_clk_ops,
49 .parent = &extal_clk,
50 .flags = CLK_ENABLE_ON_INIT,
51 };
52
53 static unsigned long peripheral0_recalc(struct clk *clk)
54 {
55 return clk->parent->rate / 8;
56 }
57
58 static struct sh_clk_ops peripheral0_clk_ops = {
59 .recalc = peripheral0_recalc,
60 };
61
62 static struct clk peripheral0_clk = {
63 .ops = &peripheral0_clk_ops,
64 .parent = &pll_clk,
65 .flags = CLK_ENABLE_ON_INIT,
66 };
67
68 static unsigned long peripheral1_recalc(struct clk *clk)
69 {
70 return clk->parent->rate / 4;
71 }
72
73 static struct sh_clk_ops peripheral1_clk_ops = {
74 .recalc = peripheral1_recalc,
75 };
76
77 static struct clk peripheral1_clk = {
78 .ops = &peripheral1_clk_ops,
79 .parent = &pll_clk,
80 .flags = CLK_ENABLE_ON_INIT,
81 };
82
83 struct clk *main_clks[] = {
84 &r_clk,
85 &extal_clk,
86 &pll_clk,
87 &peripheral0_clk,
88 &peripheral1_clk,
89 };
90
91 static int div2[] = { 1, 2, 0, 4 };
92
93 static struct clk_div_mult_table div4_div_mult_table = {
94 .divisors = div2,
95 .nr_divisors = ARRAY_SIZE(div2),
96 };
97
98 static struct clk_div4_table div4_table = {
99 .div_mult_table = &div4_div_mult_table,
100 };
101
102 enum { DIV4_I, DIV4_B,
103 DIV4_NR };
104
105 #define DIV4(_reg, _bit, _mask, _flags) \
106 SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
107
108 /* The mask field specifies the div2 entries that are valid */
109 struct clk div4_clks[DIV4_NR] = {
110 [DIV4_I] = DIV4(FRQCR, 8, 0xB, CLK_ENABLE_REG_16BIT
111 | CLK_ENABLE_ON_INIT),
112 [DIV4_B] = DIV4(FRQCR, 4, 0xA, CLK_ENABLE_REG_16BIT
113 | CLK_ENABLE_ON_INIT),
114 };
115
116 enum { MSTP72,
117 MSTP60,
118 MSTP47, MSTP46, MSTP45, MSTP44, MSTP43, MSTP42, MSTP41, MSTP40,
119 MSTP35, MSTP32, MSTP30,
120 MSTP_NR };
121
122 static struct clk mstp_clks[MSTP_NR] = {
123 [MSTP72] = SH_CLK_MSTP8(&peripheral0_clk, STBCR7, 2, 0), /* CMT */
124 [MSTP60] = SH_CLK_MSTP8(&peripheral1_clk, STBCR6, 0, 0), /* USB */
125 [MSTP47] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 7, 0), /* SCIF0 */
126 [MSTP46] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 6, 0), /* SCIF1 */
127 [MSTP45] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 5, 0), /* SCIF2 */
128 [MSTP44] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 4, 0), /* SCIF3 */
129 [MSTP43] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 3, 0), /* SCIF4 */
130 [MSTP42] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 2, 0), /* SCIF5 */
131 [MSTP41] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 1, 0), /* SCIF6 */
132 [MSTP40] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 0, 0), /* SCIF7 */
133 [MSTP35] = SH_CLK_MSTP8(&peripheral0_clk, STBCR3, 5, 0), /* MTU2 */
134 [MSTP32] = SH_CLK_MSTP8(&peripheral1_clk, STBCR3, 2, 0), /* ADC */
135 [MSTP30] = SH_CLK_MSTP8(&r_clk, STBCR3, 0, 0), /* RTC */
136 };
137
138 static struct clk_lookup lookups[] = {
139 /* main clocks */
140 CLKDEV_CON_ID("rclk", &r_clk),
141 CLKDEV_CON_ID("extal", &extal_clk),
142 CLKDEV_CON_ID("pll_clk", &pll_clk),
143 CLKDEV_CON_ID("peripheral_clk", &peripheral1_clk),
144
145 /* DIV4 clocks */
146 CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
147 CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
148
149 /* MSTP clocks */
150 CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP47]),
151 CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP46]),
152 CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP45]),
153 CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP44]),
154 CLKDEV_ICK_ID("fck", "sh-sci.4", &mstp_clks[MSTP43]),
155 CLKDEV_ICK_ID("fck", "sh-sci.5", &mstp_clks[MSTP42]),
156 CLKDEV_ICK_ID("fck", "sh-sci.6", &mstp_clks[MSTP41]),
157 CLKDEV_ICK_ID("fck", "sh-sci.7", &mstp_clks[MSTP40]),
158 CLKDEV_ICK_ID("fck", "sh-cmt-16.0", &mstp_clks[MSTP72]),
159 CLKDEV_CON_ID("usb0", &mstp_clks[MSTP60]),
160 CLKDEV_ICK_ID("fck", "sh-mtu2", &mstp_clks[MSTP35]),
161 CLKDEV_CON_ID("adc0", &mstp_clks[MSTP32]),
162 CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP30]),
163 };
164
165 int __init arch_clk_init(void)
166 {
167 int k, ret = 0;
168
169 for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
170 ret = clk_register(main_clks[k]);
171
172 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
173
174 if (!ret)
175 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
176
177 if (!ret)
178 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
179
180 return ret;
181 }
182
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