1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh4a/clock-sh7786.c
4 *
5 * SH7786 support for the clock framework
6 *
7 * Copyright (C) 2010 Paul Mundt
8 */
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/clk.h>
12 #include <linux/io.h>
13 #include <linux/clkdev.h>
14 #include <asm/clock.h>
15 #include <asm/freq.h>
16
17 /*
18 * Default rate for the root input clock, reset this with clk_set_rate()
19 * from the platform code.
20 */
21 static struct clk extal_clk = {
22 .rate = 33333333,
23 };
24
pll_recalc(struct clk * clk)25 static unsigned long pll_recalc(struct clk *clk)
26 {
27 int multiplier;
28
29 /*
30 * Clock modes 0, 1, and 2 use an x64 multiplier against PLL1,
31 * while modes 3, 4, and 5 use an x32.
32 */
33 multiplier = (sh_mv.mv_mode_pins() & 0xf) < 3 ? 64 : 32;
34
35 return clk->parent->rate * multiplier;
36 }
37
38 static struct sh_clk_ops pll_clk_ops = {
39 .recalc = pll_recalc,
40 };
41
42 static struct clk pll_clk = {
43 .ops = &pll_clk_ops,
44 .parent = &extal_clk,
45 .flags = CLK_ENABLE_ON_INIT,
46 };
47
48 static struct clk *clks[] = {
49 &extal_clk,
50 &pll_clk,
51 };
52
53 static unsigned int div2[] = { 1, 2, 4, 6, 8, 12, 16, 18,
54 24, 32, 36, 48 };
55
56 static struct clk_div_mult_table div4_div_mult_table = {
57 .divisors = div2,
58 .nr_divisors = ARRAY_SIZE(div2),
59 };
60
61 static struct clk_div4_table div4_table = {
62 .div_mult_table = &div4_div_mult_table,
63 };
64
65 enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_DDR, DIV4_DU, DIV4_P, DIV4_NR };
66
67 #define DIV4(_bit, _mask, _flags) \
68 SH_CLK_DIV4(&pll_clk, FRQMR1, _bit, _mask, _flags)
69
70 struct clk div4_clks[DIV4_NR] = {
71 [DIV4_P] = DIV4(0, 0x0b40, 0),
72 [DIV4_DU] = DIV4(4, 0x0010, 0),
73 [DIV4_DDR] = DIV4(12, 0x0002, CLK_ENABLE_ON_INIT),
74 [DIV4_B] = DIV4(16, 0x0360, CLK_ENABLE_ON_INIT),
75 [DIV4_SH] = DIV4(20, 0x0002, CLK_ENABLE_ON_INIT),
76 [DIV4_I] = DIV4(28, 0x0006, CLK_ENABLE_ON_INIT),
77 };
78
79 #define MSTPCR0 0xffc40030
80 #define MSTPCR1 0xffc40034
81
82 enum { MSTP029, MSTP028, MSTP027, MSTP026, MSTP025, MSTP024,
83 MSTP023, MSTP022, MSTP021, MSTP020, MSTP017, MSTP016,
84 MSTP015, MSTP014, MSTP011, MSTP010, MSTP009, MSTP008,
85 MSTP005, MSTP004, MSTP002,
86 MSTP112, MSTP110, MSTP109, MSTP108,
87 MSTP105, MSTP104, MSTP103, MSTP102,
88 MSTP_NR };
89
90 static struct clk mstp_clks[MSTP_NR] = {
91 /* MSTPCR0 */
92 [MSTP029] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 29, 0),
93 [MSTP028] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 28, 0),
94 [MSTP027] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 27, 0),
95 [MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0),
96 [MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0),
97 [MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0),
98 [MSTP023] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 23, 0),
99 [MSTP022] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 22, 0),
100 [MSTP021] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 21, 0),
101 [MSTP020] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 20, 0),
102 [MSTP017] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 17, 0),
103 [MSTP016] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 16, 0),
104 [MSTP015] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 15, 0),
105 [MSTP014] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 14, 0),
106 [MSTP011] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 11, 0),
107 [MSTP010] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 10, 0),
108 [MSTP009] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 9, 0),
109 [MSTP008] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 8, 0),
110 [MSTP005] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 5, 0),
111 [MSTP004] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 4, 0),
112 [MSTP002] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 2, 0),
113
114 /* MSTPCR1 */
115 [MSTP112] = SH_CLK_MSTP32(NULL, MSTPCR1, 12, 0),
116 [MSTP110] = SH_CLK_MSTP32(NULL, MSTPCR1, 10, 0),
117 [MSTP109] = SH_CLK_MSTP32(NULL, MSTPCR1, 9, 0),
118 [MSTP108] = SH_CLK_MSTP32(NULL, MSTPCR1, 8, 0),
119 [MSTP105] = SH_CLK_MSTP32(NULL, MSTPCR1, 5, 0),
120 [MSTP104] = SH_CLK_MSTP32(NULL, MSTPCR1, 4, 0),
121 [MSTP103] = SH_CLK_MSTP32(NULL, MSTPCR1, 3, 0),
122 [MSTP102] = SH_CLK_MSTP32(NULL, MSTPCR1, 2, 0),
123 };
124
125 static struct clk_lookup lookups[] = {
126 /* main clocks */
127 CLKDEV_CON_ID("extal", &extal_clk),
128 CLKDEV_CON_ID("pll_clk", &pll_clk),
129
130 /* DIV4 clocks */
131 CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
132 CLKDEV_CON_ID("du_clk", &div4_clks[DIV4_DU]),
133 CLKDEV_CON_ID("ddr_clk", &div4_clks[DIV4_DDR]),
134 CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
135 CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
136 CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
137
138 /* MSTP32 clocks */
139 CLKDEV_ICK_ID("fck", "sh-sci.5", &mstp_clks[MSTP029]),
140 CLKDEV_ICK_ID("fck", "sh-sci.4", &mstp_clks[MSTP028]),
141 CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP027]),
142 CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP026]),
143 CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP025]),
144 CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP024]),
145
146 CLKDEV_CON_ID("ssi3_fck", &mstp_clks[MSTP023]),
147 CLKDEV_CON_ID("ssi2_fck", &mstp_clks[MSTP022]),
148 CLKDEV_CON_ID("ssi1_fck", &mstp_clks[MSTP021]),
149 CLKDEV_CON_ID("ssi0_fck", &mstp_clks[MSTP020]),
150 CLKDEV_CON_ID("hac1_fck", &mstp_clks[MSTP017]),
151 CLKDEV_CON_ID("hac0_fck", &mstp_clks[MSTP016]),
152 CLKDEV_CON_ID("i2c1_fck", &mstp_clks[MSTP015]),
153 CLKDEV_CON_ID("i2c0_fck", &mstp_clks[MSTP014]),
154
155 CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP008]),
156 CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP009]),
157 CLKDEV_ICK_ID("fck", "sh-tmu.2", &mstp_clks[MSTP010]),
158 CLKDEV_ICK_ID("fck", "sh-tmu.3", &mstp_clks[MSTP011]),
159
160 CLKDEV_CON_ID("sdif1_fck", &mstp_clks[MSTP005]),
161 CLKDEV_CON_ID("sdif0_fck", &mstp_clks[MSTP004]),
162 CLKDEV_CON_ID("hspi_fck", &mstp_clks[MSTP002]),
163 CLKDEV_CON_ID("usb_fck", &mstp_clks[MSTP112]),
164 CLKDEV_CON_ID("pcie2_fck", &mstp_clks[MSTP110]),
165 CLKDEV_CON_ID("pcie1_fck", &mstp_clks[MSTP109]),
166 CLKDEV_CON_ID("pcie0_fck", &mstp_clks[MSTP108]),
167 CLKDEV_CON_ID("dmac_11_6_fck", &mstp_clks[MSTP105]),
168 CLKDEV_CON_ID("dmac_5_0_fck", &mstp_clks[MSTP104]),
169 CLKDEV_CON_ID("du_fck", &mstp_clks[MSTP103]),
170 CLKDEV_CON_ID("ether_fck", &mstp_clks[MSTP102]),
171 };
172
arch_clk_init(void)173 int __init arch_clk_init(void)
174 {
175 int i, ret = 0;
176
177 for (i = 0; i < ARRAY_SIZE(clks); i++)
178 ret |= clk_register(clks[i]);
179
180 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
181
182 if (!ret)
183 ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
184 &div4_table);
185 if (!ret)
186 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
187
188 return ret;
189 }
190