1 /*
2  * arch/sh/kernel/cpu/sh4a/clock-sh7786.c
3  *
4  * SH7786 support for the clock framework
5  *
6  *  Copyright (C) 2010  Paul Mundt
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/clk.h>
15 #include <linux/io.h>
16 #include <linux/clkdev.h>
17 #include <asm/clock.h>
18 #include <asm/freq.h>
19 
20 /*
21  * Default rate for the root input clock, reset this with clk_set_rate()
22  * from the platform code.
23  */
24 static struct clk extal_clk = {
25 	.rate		= 33333333,
26 };
27 
28 static unsigned long pll_recalc(struct clk *clk)
29 {
30 	int multiplier;
31 
32 	/*
33 	 * Clock modes 0, 1, and 2 use an x64 multiplier against PLL1,
34 	 * while modes 3, 4, and 5 use an x32.
35 	 */
36 	multiplier = (sh_mv.mv_mode_pins() & 0xf) < 3 ? 64 : 32;
37 
38 	return clk->parent->rate * multiplier;
39 }
40 
41 static struct sh_clk_ops pll_clk_ops = {
42 	.recalc		= pll_recalc,
43 };
44 
45 static struct clk pll_clk = {
46 	.ops		= &pll_clk_ops,
47 	.parent		= &extal_clk,
48 	.flags		= CLK_ENABLE_ON_INIT,
49 };
50 
51 static struct clk *clks[] = {
52 	&extal_clk,
53 	&pll_clk,
54 };
55 
56 static unsigned int div2[] = { 1, 2, 4, 6, 8, 12, 16, 18,
57 			       24, 32, 36, 48 };
58 
59 static struct clk_div_mult_table div4_div_mult_table = {
60 	.divisors = div2,
61 	.nr_divisors = ARRAY_SIZE(div2),
62 };
63 
64 static struct clk_div4_table div4_table = {
65 	.div_mult_table = &div4_div_mult_table,
66 };
67 
68 enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_DDR, DIV4_DU, DIV4_P, DIV4_NR };
69 
70 #define DIV4(_bit, _mask, _flags) \
71   SH_CLK_DIV4(&pll_clk, FRQMR1, _bit, _mask, _flags)
72 
73 struct clk div4_clks[DIV4_NR] = {
74 	[DIV4_P] = DIV4(0, 0x0b40, 0),
75 	[DIV4_DU] = DIV4(4, 0x0010, 0),
76 	[DIV4_DDR] = DIV4(12, 0x0002, CLK_ENABLE_ON_INIT),
77 	[DIV4_B] = DIV4(16, 0x0360, CLK_ENABLE_ON_INIT),
78 	[DIV4_SH] = DIV4(20, 0x0002, CLK_ENABLE_ON_INIT),
79 	[DIV4_I] = DIV4(28, 0x0006, CLK_ENABLE_ON_INIT),
80 };
81 
82 #define MSTPCR0		0xffc40030
83 #define MSTPCR1		0xffc40034
84 
85 enum { MSTP029, MSTP028, MSTP027, MSTP026, MSTP025, MSTP024,
86        MSTP023, MSTP022, MSTP021, MSTP020, MSTP017, MSTP016,
87        MSTP015, MSTP014, MSTP011, MSTP010, MSTP009, MSTP008,
88        MSTP005, MSTP004, MSTP002,
89        MSTP112, MSTP110, MSTP109, MSTP108,
90        MSTP105, MSTP104, MSTP103, MSTP102,
91        MSTP_NR };
92 
93 static struct clk mstp_clks[MSTP_NR] = {
94 	/* MSTPCR0 */
95 	[MSTP029] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 29, 0),
96 	[MSTP028] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 28, 0),
97 	[MSTP027] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 27, 0),
98 	[MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0),
99 	[MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0),
100 	[MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0),
101 	[MSTP023] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 23, 0),
102 	[MSTP022] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 22, 0),
103 	[MSTP021] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 21, 0),
104 	[MSTP020] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 20, 0),
105 	[MSTP017] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 17, 0),
106 	[MSTP016] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 16, 0),
107 	[MSTP015] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 15, 0),
108 	[MSTP014] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 14, 0),
109 	[MSTP011] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 11, 0),
110 	[MSTP010] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 10, 0),
111 	[MSTP009] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 9, 0),
112 	[MSTP008] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 8, 0),
113 	[MSTP005] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 5, 0),
114 	[MSTP004] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 4, 0),
115 	[MSTP002] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 2, 0),
116 
117 	/* MSTPCR1 */
118 	[MSTP112] = SH_CLK_MSTP32(NULL, MSTPCR1, 12, 0),
119 	[MSTP110] = SH_CLK_MSTP32(NULL, MSTPCR1, 10, 0),
120 	[MSTP109] = SH_CLK_MSTP32(NULL, MSTPCR1, 9, 0),
121 	[MSTP108] = SH_CLK_MSTP32(NULL, MSTPCR1, 8, 0),
122 	[MSTP105] = SH_CLK_MSTP32(NULL, MSTPCR1, 5, 0),
123 	[MSTP104] = SH_CLK_MSTP32(NULL, MSTPCR1, 4, 0),
124 	[MSTP103] = SH_CLK_MSTP32(NULL, MSTPCR1, 3, 0),
125 	[MSTP102] = SH_CLK_MSTP32(NULL, MSTPCR1, 2, 0),
126 };
127 
128 static struct clk_lookup lookups[] = {
129 	/* main clocks */
130 	CLKDEV_CON_ID("extal", &extal_clk),
131 	CLKDEV_CON_ID("pll_clk", &pll_clk),
132 
133 	/* DIV4 clocks */
134 	CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
135 	CLKDEV_CON_ID("du_clk", &div4_clks[DIV4_DU]),
136 	CLKDEV_CON_ID("ddr_clk", &div4_clks[DIV4_DDR]),
137 	CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
138 	CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
139 	CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
140 
141 	/* MSTP32 clocks */
142 	CLKDEV_ICK_ID("sci_fck", "sh-sci.5", &mstp_clks[MSTP029]),
143 	CLKDEV_ICK_ID("sci_fck", "sh-sci.4", &mstp_clks[MSTP028]),
144 	CLKDEV_ICK_ID("sci_fck", "sh-sci.3", &mstp_clks[MSTP027]),
145 	CLKDEV_ICK_ID("sci_fck", "sh-sci.2", &mstp_clks[MSTP026]),
146 	CLKDEV_ICK_ID("sci_fck", "sh-sci.1", &mstp_clks[MSTP025]),
147 	CLKDEV_ICK_ID("sci_fck", "sh-sci.0", &mstp_clks[MSTP024]),
148 
149 	CLKDEV_CON_ID("ssi3_fck", &mstp_clks[MSTP023]),
150 	CLKDEV_CON_ID("ssi2_fck", &mstp_clks[MSTP022]),
151 	CLKDEV_CON_ID("ssi1_fck", &mstp_clks[MSTP021]),
152 	CLKDEV_CON_ID("ssi0_fck", &mstp_clks[MSTP020]),
153 	CLKDEV_CON_ID("hac1_fck", &mstp_clks[MSTP017]),
154 	CLKDEV_CON_ID("hac0_fck", &mstp_clks[MSTP016]),
155 	CLKDEV_CON_ID("i2c1_fck", &mstp_clks[MSTP015]),
156 	CLKDEV_CON_ID("i2c0_fck", &mstp_clks[MSTP014]),
157 
158 	CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP008]),
159 	CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP009]),
160 	CLKDEV_ICK_ID("fck", "sh-tmu.2", &mstp_clks[MSTP010]),
161 	CLKDEV_ICK_ID("fck", "sh-tmu.3", &mstp_clks[MSTP011]),
162 
163 	CLKDEV_CON_ID("sdif1_fck", &mstp_clks[MSTP005]),
164 	CLKDEV_CON_ID("sdif0_fck", &mstp_clks[MSTP004]),
165 	CLKDEV_CON_ID("hspi_fck", &mstp_clks[MSTP002]),
166 	CLKDEV_CON_ID("usb_fck", &mstp_clks[MSTP112]),
167 	CLKDEV_CON_ID("pcie2_fck", &mstp_clks[MSTP110]),
168 	CLKDEV_CON_ID("pcie1_fck", &mstp_clks[MSTP109]),
169 	CLKDEV_CON_ID("pcie0_fck", &mstp_clks[MSTP108]),
170 	CLKDEV_CON_ID("dmac_11_6_fck", &mstp_clks[MSTP105]),
171 	CLKDEV_CON_ID("dmac_5_0_fck", &mstp_clks[MSTP104]),
172 	CLKDEV_CON_ID("du_fck", &mstp_clks[MSTP103]),
173 	CLKDEV_CON_ID("ether_fck", &mstp_clks[MSTP102]),
174 };
175 
176 int __init arch_clk_init(void)
177 {
178 	int i, ret = 0;
179 
180 	for (i = 0; i < ARRAY_SIZE(clks); i++)
181 		ret |= clk_register(clks[i]);
182 
183 	clkdev_add_table(lookups, ARRAY_SIZE(lookups));
184 
185 	if (!ret)
186 		ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
187 					   &div4_table);
188 	if (!ret)
189 		ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
190 
191 	return ret;
192 }
193