1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh2a/clock-sh7264.c
4 *
5 * SH7264 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 /* SH7264 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 #define STBCR8 0xfffe041c
23
24 static const unsigned int pll1rate[] = {8, 12};
25
26 static unsigned int pll1_div;
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 = 18000000,
39 };
40
pll_recalc(struct clk * clk)41 static unsigned long pll_recalc(struct clk *clk)
42 {
43 unsigned long rate = clk->parent->rate / pll1_div;
44 return rate * pll1rate[(__raw_readw(FRQCR) >> 8) & 1];
45 }
46
47 static struct sh_clk_ops pll_clk_ops = {
48 .recalc = pll_recalc,
49 };
50
51 static struct clk pll_clk = {
52 .ops = &pll_clk_ops,
53 .parent = &extal_clk,
54 .flags = CLK_ENABLE_ON_INIT,
55 };
56
57 struct clk *main_clks[] = {
58 &r_clk,
59 &extal_clk,
60 &pll_clk,
61 };
62
63 static int div2[] = { 1, 2, 3, 4, 6, 8, 12 };
64
65 static struct clk_div_mult_table div4_div_mult_table = {
66 .divisors = div2,
67 .nr_divisors = ARRAY_SIZE(div2),
68 };
69
70 static struct clk_div4_table div4_table = {
71 .div_mult_table = &div4_div_mult_table,
72 };
73
74 enum { DIV4_I, DIV4_P,
75 DIV4_NR };
76
77 #define DIV4(_reg, _bit, _mask, _flags) \
78 SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
79
80 /* The mask field specifies the div2 entries that are valid */
81 struct clk div4_clks[DIV4_NR] = {
82 [DIV4_I] = DIV4(FRQCR, 4, 0x7, CLK_ENABLE_REG_16BIT
83 | CLK_ENABLE_ON_INIT),
84 [DIV4_P] = DIV4(FRQCR, 0, 0x78, CLK_ENABLE_REG_16BIT),
85 };
86
87 enum { MSTP77, MSTP74, MSTP72,
88 MSTP60,
89 MSTP35, MSTP34, MSTP33, MSTP32, MSTP30,
90 MSTP_NR };
91
92 static struct clk mstp_clks[MSTP_NR] = {
93 [MSTP77] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR7, 7, 0), /* SCIF */
94 [MSTP74] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR7, 4, 0), /* VDC */
95 [MSTP72] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR7, 2, 0), /* CMT */
96 [MSTP60] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR6, 0, 0), /* USB */
97 [MSTP35] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 6, 0), /* MTU2 */
98 [MSTP34] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 4, 0), /* SDHI0 */
99 [MSTP33] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 3, 0), /* SDHI1 */
100 [MSTP32] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 2, 0), /* ADC */
101 [MSTP30] = SH_CLK_MSTP8(&r_clk, STBCR3, 0, 0), /* RTC */
102 };
103
104 static struct clk_lookup lookups[] = {
105 /* main clocks */
106 CLKDEV_CON_ID("rclk", &r_clk),
107 CLKDEV_CON_ID("extal", &extal_clk),
108 CLKDEV_CON_ID("pll_clk", &pll_clk),
109
110 /* DIV4 clocks */
111 CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
112 CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
113
114 /* MSTP clocks */
115 CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP77]),
116 CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP77]),
117 CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP77]),
118 CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP77]),
119 CLKDEV_ICK_ID("fck", "sh-sci.4", &mstp_clks[MSTP77]),
120 CLKDEV_ICK_ID("fck", "sh-sci.5", &mstp_clks[MSTP77]),
121 CLKDEV_ICK_ID("fck", "sh-sci.6", &mstp_clks[MSTP77]),
122 CLKDEV_ICK_ID("fck", "sh-sci.7", &mstp_clks[MSTP77]),
123 CLKDEV_CON_ID("vdc3", &mstp_clks[MSTP74]),
124 CLKDEV_ICK_ID("fck", "sh-cmt-16.0", &mstp_clks[MSTP72]),
125 CLKDEV_CON_ID("usb0", &mstp_clks[MSTP60]),
126 CLKDEV_ICK_ID("fck", "sh-mtu2", &mstp_clks[MSTP35]),
127 CLKDEV_CON_ID("sdhi0", &mstp_clks[MSTP34]),
128 CLKDEV_CON_ID("sdhi1", &mstp_clks[MSTP33]),
129 CLKDEV_CON_ID("adc0", &mstp_clks[MSTP32]),
130 CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP30]),
131 };
132
arch_clk_init(void)133 int __init arch_clk_init(void)
134 {
135 int k, ret = 0;
136
137 if (test_mode_pin(MODE_PIN0)) {
138 if (test_mode_pin(MODE_PIN1))
139 pll1_div = 3;
140 else
141 pll1_div = 4;
142 } else
143 pll1_div = 1;
144
145 for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
146 ret = clk_register(main_clks[k]);
147
148 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
149
150 if (!ret)
151 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
152
153 if (!ret)
154 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
155
156 return ret;
157 }
158