1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh4/clock-sh7757.c
4 *
5 * SH7757 support for the clock framework
6 *
7 * Copyright (C) 2009-2010 Renesas Solutions Corp.
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 #include <asm/freq.h>
15
16 /*
17 * Default rate for the root input clock, reset this with clk_set_rate()
18 * from the platform code.
19 */
20 static struct clk extal_clk = {
21 .rate = 48000000,
22 };
23
pll_recalc(struct clk * clk)24 static unsigned long pll_recalc(struct clk *clk)
25 {
26 int multiplier;
27
28 multiplier = test_mode_pin(MODE_PIN0) ? 24 : 16;
29
30 return clk->parent->rate * multiplier;
31 }
32
33 static struct sh_clk_ops pll_clk_ops = {
34 .recalc = pll_recalc,
35 };
36
37 static struct clk pll_clk = {
38 .ops = &pll_clk_ops,
39 .parent = &extal_clk,
40 .flags = CLK_ENABLE_ON_INIT,
41 };
42
43 static struct clk *clks[] = {
44 &extal_clk,
45 &pll_clk,
46 };
47
48 static unsigned int div2[] = { 1, 1, 2, 1, 1, 4, 1, 6,
49 1, 1, 1, 16, 1, 24, 1, 1 };
50
51 static struct clk_div_mult_table div4_div_mult_table = {
52 .divisors = div2,
53 .nr_divisors = ARRAY_SIZE(div2),
54 };
55
56 static struct clk_div4_table div4_table = {
57 .div_mult_table = &div4_div_mult_table,
58 };
59
60 enum { DIV4_I, DIV4_SH, DIV4_P, DIV4_NR };
61
62 #define DIV4(_bit, _mask, _flags) \
63 SH_CLK_DIV4(&pll_clk, FRQCR, _bit, _mask, _flags)
64
65 struct clk div4_clks[DIV4_NR] = {
66 /*
67 * P clock is always enable, because some P clock modules is used
68 * by Host PC.
69 */
70 [DIV4_P] = DIV4(0, 0x2800, CLK_ENABLE_ON_INIT),
71 [DIV4_SH] = DIV4(12, 0x00a0, CLK_ENABLE_ON_INIT),
72 [DIV4_I] = DIV4(20, 0x0004, CLK_ENABLE_ON_INIT),
73 };
74
75 #define MSTPCR0 0xffc80030
76 #define MSTPCR1 0xffc80034
77 #define MSTPCR2 0xffc10028
78
79 enum { MSTP004, MSTP000, MSTP127, MSTP114, MSTP113, MSTP112,
80 MSTP111, MSTP110, MSTP103, MSTP102, MSTP220,
81 MSTP_NR };
82
83 static struct clk mstp_clks[MSTP_NR] = {
84 /* MSTPCR0 */
85 [MSTP004] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 4, 0),
86 [MSTP000] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 0, 0),
87
88 /* MSTPCR1 */
89 [MSTP127] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 27, 0),
90 [MSTP114] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 14, 0),
91 [MSTP113] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 13, 0),
92 [MSTP112] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 12, 0),
93 [MSTP111] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 11, 0),
94 [MSTP110] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 10, 0),
95 [MSTP103] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 3, 0),
96 [MSTP102] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 2, 0),
97
98 /* MSTPCR2 */
99 [MSTP220] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 20, 0),
100 };
101
102 static struct clk_lookup lookups[] = {
103 /* main clocks */
104 CLKDEV_CON_ID("extal", &extal_clk),
105 CLKDEV_CON_ID("pll_clk", &pll_clk),
106
107 /* DIV4 clocks */
108 CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
109 CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
110 CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
111
112 /* MSTP32 clocks */
113 CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[MSTP004]),
114 CLKDEV_CON_ID("riic0", &mstp_clks[MSTP000]),
115 CLKDEV_CON_ID("riic1", &mstp_clks[MSTP000]),
116 CLKDEV_CON_ID("riic2", &mstp_clks[MSTP000]),
117 CLKDEV_CON_ID("riic3", &mstp_clks[MSTP000]),
118 CLKDEV_CON_ID("riic4", &mstp_clks[MSTP000]),
119 CLKDEV_CON_ID("riic5", &mstp_clks[MSTP000]),
120 CLKDEV_CON_ID("riic6", &mstp_clks[MSTP000]),
121 CLKDEV_CON_ID("riic7", &mstp_clks[MSTP000]),
122
123 CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP113]),
124 CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP114]),
125 CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP112]),
126 CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP111]),
127 CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP110]),
128
129 CLKDEV_CON_ID("usb_fck", &mstp_clks[MSTP103]),
130 CLKDEV_DEV_ID("renesas_usbhs.0", &mstp_clks[MSTP102]),
131 CLKDEV_CON_ID("mmc0", &mstp_clks[MSTP220]),
132 CLKDEV_DEV_ID("rspi.2", &mstp_clks[MSTP127]),
133 };
134
arch_clk_init(void)135 int __init arch_clk_init(void)
136 {
137 int i, ret = 0;
138
139 for (i = 0; i < ARRAY_SIZE(clks); i++)
140 ret |= clk_register(clks[i]);
141
142 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
143
144 if (!ret)
145 ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
146 &div4_table);
147 if (!ret)
148 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
149
150 return ret;
151 }
152
153