1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh4a/clock-sh7366.c
4 *
5 * SH7366 clock framework support
6 *
7 * Copyright (C) 2009 Magnus Damm
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 /* SH7366 registers */
16 #define FRQCR 0xa4150000
17 #define VCLKCR 0xa4150004
18 #define SCLKACR 0xa4150008
19 #define SCLKBCR 0xa415000c
20 #define PLLCR 0xa4150024
21 #define MSTPCR0 0xa4150030
22 #define MSTPCR1 0xa4150034
23 #define MSTPCR2 0xa4150038
24 #define DLLFRQ 0xa4150050
25
26 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
27 static struct clk r_clk = {
28 .rate = 32768,
29 };
30
31 /*
32 * Default rate for the root input clock, reset this with clk_set_rate()
33 * from the platform code.
34 */
35 struct clk extal_clk = {
36 .rate = 33333333,
37 };
38
39 /* The dll block multiplies the 32khz r_clk, may be used instead of extal */
dll_recalc(struct clk * clk)40 static unsigned long dll_recalc(struct clk *clk)
41 {
42 unsigned long mult;
43
44 if (__raw_readl(PLLCR) & 0x1000)
45 mult = __raw_readl(DLLFRQ);
46 else
47 mult = 0;
48
49 return clk->parent->rate * mult;
50 }
51
52 static struct sh_clk_ops dll_clk_ops = {
53 .recalc = dll_recalc,
54 };
55
56 static struct clk dll_clk = {
57 .ops = &dll_clk_ops,
58 .parent = &r_clk,
59 .flags = CLK_ENABLE_ON_INIT,
60 };
61
pll_recalc(struct clk * clk)62 static unsigned long pll_recalc(struct clk *clk)
63 {
64 unsigned long mult = 1;
65 unsigned long div = 1;
66
67 if (__raw_readl(PLLCR) & 0x4000)
68 mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1);
69 else
70 div = 2;
71
72 return (clk->parent->rate * mult) / div;
73 }
74
75 static struct sh_clk_ops pll_clk_ops = {
76 .recalc = pll_recalc,
77 };
78
79 static struct clk pll_clk = {
80 .ops = &pll_clk_ops,
81 .flags = CLK_ENABLE_ON_INIT,
82 };
83
84 struct clk *main_clks[] = {
85 &r_clk,
86 &extal_clk,
87 &dll_clk,
88 &pll_clk,
89 };
90
91 static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
92 static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 };
93
94 static struct clk_div_mult_table div4_div_mult_table = {
95 .divisors = divisors,
96 .nr_divisors = ARRAY_SIZE(divisors),
97 .multipliers = multipliers,
98 .nr_multipliers = ARRAY_SIZE(multipliers),
99 };
100
101 static struct clk_div4_table div4_table = {
102 .div_mult_table = &div4_div_mult_table,
103 };
104
105 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P,
106 DIV4_SIUA, DIV4_SIUB, DIV4_NR };
107
108 #define DIV4(_reg, _bit, _mask, _flags) \
109 SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
110
111 struct clk div4_clks[DIV4_NR] = {
112 [DIV4_I] = DIV4(FRQCR, 20, 0x1fef, CLK_ENABLE_ON_INIT),
113 [DIV4_U] = DIV4(FRQCR, 16, 0x1fff, CLK_ENABLE_ON_INIT),
114 [DIV4_SH] = DIV4(FRQCR, 12, 0x1fff, CLK_ENABLE_ON_INIT),
115 [DIV4_B] = DIV4(FRQCR, 8, 0x1fff, CLK_ENABLE_ON_INIT),
116 [DIV4_B3] = DIV4(FRQCR, 4, 0x1fff, CLK_ENABLE_ON_INIT),
117 [DIV4_P] = DIV4(FRQCR, 0, 0x1fff, 0),
118 [DIV4_SIUA] = DIV4(SCLKACR, 0, 0x1fff, 0),
119 [DIV4_SIUB] = DIV4(SCLKBCR, 0, 0x1fff, 0),
120 };
121
122 enum { DIV6_V, DIV6_NR };
123
124 struct clk div6_clks[DIV6_NR] = {
125 [DIV6_V] = SH_CLK_DIV6(&pll_clk, VCLKCR, 0),
126 };
127
128 #define MSTP(_parent, _reg, _bit, _flags) \
129 SH_CLK_MSTP32(_parent, _reg, _bit, _flags)
130
131 enum { MSTP031, MSTP030, MSTP029, MSTP028, MSTP026,
132 MSTP023, MSTP022, MSTP021, MSTP020, MSTP019, MSTP018, MSTP017, MSTP016,
133 MSTP015, MSTP014, MSTP013, MSTP012, MSTP011, MSTP010,
134 MSTP007, MSTP006, MSTP005, MSTP002, MSTP001,
135 MSTP109, MSTP100,
136 MSTP227, MSTP226, MSTP224, MSTP223, MSTP222, MSTP218, MSTP217,
137 MSTP211, MSTP207, MSTP205, MSTP204, MSTP203, MSTP202, MSTP201, MSTP200,
138 MSTP_NR };
139
140 static struct clk mstp_clks[MSTP_NR] = {
141 /* See page 52 of Datasheet V0.40: Overview -> Block Diagram */
142 [MSTP031] = MSTP(&div4_clks[DIV4_I], MSTPCR0, 31, CLK_ENABLE_ON_INIT),
143 [MSTP030] = MSTP(&div4_clks[DIV4_I], MSTPCR0, 30, CLK_ENABLE_ON_INIT),
144 [MSTP029] = MSTP(&div4_clks[DIV4_I], MSTPCR0, 29, CLK_ENABLE_ON_INIT),
145 [MSTP028] = MSTP(&div4_clks[DIV4_SH], MSTPCR0, 28, CLK_ENABLE_ON_INIT),
146 [MSTP026] = MSTP(&div4_clks[DIV4_B], MSTPCR0, 26, CLK_ENABLE_ON_INIT),
147 [MSTP023] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 23, 0),
148 [MSTP022] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 22, 0),
149 [MSTP021] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 21, 0),
150 [MSTP020] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 20, 0),
151 [MSTP019] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 19, 0),
152 [MSTP017] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 17, 0),
153 [MSTP015] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 15, 0),
154 [MSTP014] = MSTP(&r_clk, MSTPCR0, 14, 0),
155 [MSTP013] = MSTP(&r_clk, MSTPCR0, 13, 0),
156 [MSTP011] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 11, 0),
157 [MSTP010] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 10, 0),
158 [MSTP007] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 7, 0),
159 [MSTP006] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 6, 0),
160 [MSTP005] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 5, 0),
161 [MSTP002] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 2, 0),
162 [MSTP001] = MSTP(&div4_clks[DIV4_P], MSTPCR0, 1, 0),
163
164 [MSTP109] = MSTP(&div4_clks[DIV4_P], MSTPCR1, 9, 0),
165
166 [MSTP227] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 27, 0),
167 [MSTP226] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 26, 0),
168 [MSTP224] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 24, 0),
169 [MSTP223] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 23, 0),
170 [MSTP222] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 22, 0),
171 [MSTP218] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 18, 0),
172 [MSTP217] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 17, 0),
173 [MSTP211] = MSTP(&div4_clks[DIV4_P], MSTPCR2, 11, 0),
174 [MSTP207] = MSTP(&div4_clks[DIV4_B], MSTPCR2, 7, CLK_ENABLE_ON_INIT),
175 [MSTP205] = MSTP(&div4_clks[DIV4_B], MSTPCR2, 5, 0),
176 [MSTP204] = MSTP(&div4_clks[DIV4_B], MSTPCR2, 4, 0),
177 [MSTP203] = MSTP(&div4_clks[DIV4_B], MSTPCR2, 3, 0),
178 [MSTP202] = MSTP(&div4_clks[DIV4_B], MSTPCR2, 2, CLK_ENABLE_ON_INIT),
179 [MSTP201] = MSTP(&div4_clks[DIV4_B], MSTPCR2, 1, CLK_ENABLE_ON_INIT),
180 [MSTP200] = MSTP(&div4_clks[DIV4_B], MSTPCR2, 0, 0),
181 };
182
183 static struct clk_lookup lookups[] = {
184 /* main clocks */
185 CLKDEV_CON_ID("rclk", &r_clk),
186 CLKDEV_CON_ID("extal", &extal_clk),
187 CLKDEV_CON_ID("dll_clk", &dll_clk),
188 CLKDEV_CON_ID("pll_clk", &pll_clk),
189
190 /* DIV4 clocks */
191 CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
192 CLKDEV_CON_ID("umem_clk", &div4_clks[DIV4_U]),
193 CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
194 CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
195 CLKDEV_CON_ID("b3_clk", &div4_clks[DIV4_B3]),
196 CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
197 CLKDEV_CON_ID("siua_clk", &div4_clks[DIV4_SIUA]),
198 CLKDEV_CON_ID("siub_clk", &div4_clks[DIV4_SIUB]),
199
200 /* DIV6 clocks */
201 CLKDEV_CON_ID("video_clk", &div6_clks[DIV6_V]),
202
203 /* MSTP32 clocks */
204 CLKDEV_CON_ID("tlb0", &mstp_clks[MSTP031]),
205 CLKDEV_CON_ID("ic0", &mstp_clks[MSTP030]),
206 CLKDEV_CON_ID("oc0", &mstp_clks[MSTP029]),
207 CLKDEV_CON_ID("rsmem0", &mstp_clks[MSTP028]),
208 CLKDEV_CON_ID("xymem0", &mstp_clks[MSTP026]),
209 CLKDEV_CON_ID("intc3", &mstp_clks[MSTP023]),
210 CLKDEV_CON_ID("intc0", &mstp_clks[MSTP022]),
211 CLKDEV_CON_ID("dmac0", &mstp_clks[MSTP021]),
212 CLKDEV_CON_ID("sh0", &mstp_clks[MSTP020]),
213 CLKDEV_CON_ID("hudi0", &mstp_clks[MSTP019]),
214 CLKDEV_CON_ID("ubc0", &mstp_clks[MSTP017]),
215 CLKDEV_CON_ID("tmu_fck", &mstp_clks[MSTP015]),
216 CLKDEV_ICK_ID("fck", "sh-cmt-32.0", &mstp_clks[MSTP014]),
217 CLKDEV_CON_ID("rwdt0", &mstp_clks[MSTP013]),
218 CLKDEV_CON_ID("mfi0", &mstp_clks[MSTP011]),
219 CLKDEV_CON_ID("flctl0", &mstp_clks[MSTP010]),
220
221 CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP007]),
222 CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP006]),
223 CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP005]),
224
225 CLKDEV_CON_ID("msiof0", &mstp_clks[MSTP002]),
226 CLKDEV_CON_ID("sbr0", &mstp_clks[MSTP001]),
227 CLKDEV_DEV_ID("i2c-sh_mobile.0", &mstp_clks[MSTP109]),
228 CLKDEV_CON_ID("icb0", &mstp_clks[MSTP227]),
229 CLKDEV_CON_ID("meram0", &mstp_clks[MSTP226]),
230 CLKDEV_CON_ID("dacy1", &mstp_clks[MSTP224]),
231 CLKDEV_CON_ID("dacy0", &mstp_clks[MSTP223]),
232 CLKDEV_CON_ID("tsif0", &mstp_clks[MSTP222]),
233 CLKDEV_CON_ID("sdhi0", &mstp_clks[MSTP218]),
234 CLKDEV_CON_ID("mmcif0", &mstp_clks[MSTP217]),
235 CLKDEV_CON_ID("usbf0", &mstp_clks[MSTP211]),
236 CLKDEV_CON_ID("veu1", &mstp_clks[MSTP207]),
237 CLKDEV_CON_ID("vou0", &mstp_clks[MSTP205]),
238 CLKDEV_CON_ID("beu0", &mstp_clks[MSTP204]),
239 CLKDEV_CON_ID("ceu0", &mstp_clks[MSTP203]),
240 CLKDEV_CON_ID("veu0", &mstp_clks[MSTP202]),
241 CLKDEV_CON_ID("vpu0", &mstp_clks[MSTP201]),
242 CLKDEV_CON_ID("lcdc0", &mstp_clks[MSTP200]),
243 };
244
arch_clk_init(void)245 int __init arch_clk_init(void)
246 {
247 int k, ret = 0;
248
249 /* autodetect extal or dll configuration */
250 if (__raw_readl(PLLCR) & 0x1000)
251 pll_clk.parent = &dll_clk;
252 else
253 pll_clk.parent = &extal_clk;
254
255 for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
256 ret = clk_register(main_clks[k]);
257
258 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
259
260 if (!ret)
261 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
262
263 if (!ret)
264 ret = sh_clk_div6_register(div6_clks, DIV6_NR);
265
266 if (!ret)
267 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
268
269 return ret;
270 }
271