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c3828949 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e89406c9 SH |
2 | /* |
3 | * Marvell Kirkwood SoC clocks | |
4 | * | |
5 | * Copyright (C) 2012 Marvell | |
6 | * | |
7 | * Gregory CLEMENT <gregory.clement@free-electrons.com> | |
8 | * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | |
9 | * Andrew Lunn <andrew@lunn.ch> | |
10 | * | |
e89406c9 SH |
11 | */ |
12 | ||
13 | #include <linux/kernel.h> | |
e8e8a9b0 | 14 | #include <linux/slab.h> |
e89406c9 SH |
15 | #include <linux/clk-provider.h> |
16 | #include <linux/io.h> | |
17 | #include <linux/of.h> | |
e8e8a9b0 | 18 | #include <linux/of_address.h> |
e89406c9 SH |
19 | #include "common.h" |
20 | ||
21 | /* | |
22 | * Core Clocks | |
23 | * | |
24 | * Kirkwood PLL sample-at-reset configuration | |
25 | * (6180 has different SAR layout than other Kirkwood SoCs) | |
26 | * | |
27 | * SAR0[4:3,22,1] : CPU frequency (6281,6292,6282) | |
28 | * 4 = 600 MHz | |
29 | * 6 = 800 MHz | |
30 | * 7 = 1000 MHz | |
31 | * 9 = 1200 MHz | |
32 | * 12 = 1500 MHz | |
33 | * 13 = 1600 MHz | |
34 | * 14 = 1800 MHz | |
35 | * 15 = 2000 MHz | |
36 | * others reserved. | |
37 | * | |
38 | * SAR0[19,10:9] : CPU to L2 Clock divider ratio (6281,6292,6282) | |
39 | * 1 = (1/2) * CPU | |
40 | * 3 = (1/3) * CPU | |
41 | * 5 = (1/4) * CPU | |
42 | * others reserved. | |
43 | * | |
44 | * SAR0[8:5] : CPU to DDR DRAM Clock divider ratio (6281,6292,6282) | |
45 | * 2 = (1/2) * CPU | |
46 | * 4 = (1/3) * CPU | |
47 | * 6 = (1/4) * CPU | |
48 | * 7 = (2/9) * CPU | |
49 | * 8 = (1/5) * CPU | |
50 | * 9 = (1/6) * CPU | |
51 | * others reserved. | |
52 | * | |
53 | * SAR0[4:2] : Kirkwood 6180 cpu/l2/ddr clock configuration (6180 only) | |
54 | * 5 = [CPU = 600 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/3) * CPU] | |
55 | * 6 = [CPU = 800 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/4) * CPU] | |
56 | * 7 = [CPU = 1000 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/5) * CPU] | |
57 | * others reserved. | |
58 | * | |
59 | * SAR0[21] : TCLK frequency | |
60 | * 0 = 200 MHz | |
61 | * 1 = 166 MHz | |
62 | * others reserved. | |
63 | */ | |
64 | ||
65 | #define SAR_KIRKWOOD_CPU_FREQ(x) \ | |
66 | (((x & (1 << 1)) >> 1) | \ | |
67 | ((x & (1 << 22)) >> 21) | \ | |
68 | ((x & (3 << 3)) >> 1)) | |
69 | #define SAR_KIRKWOOD_L2_RATIO(x) \ | |
70 | (((x & (3 << 9)) >> 9) | \ | |
71 | (((x & (1 << 19)) >> 17))) | |
72 | #define SAR_KIRKWOOD_DDR_RATIO 5 | |
73 | #define SAR_KIRKWOOD_DDR_RATIO_MASK 0xf | |
74 | #define SAR_MV88F6180_CLK 2 | |
75 | #define SAR_MV88F6180_CLK_MASK 0x7 | |
76 | #define SAR_KIRKWOOD_TCLK_FREQ 21 | |
77 | #define SAR_KIRKWOOD_TCLK_FREQ_MASK 0x1 | |
78 | ||
79 | enum { KIRKWOOD_CPU_TO_L2, KIRKWOOD_CPU_TO_DDR }; | |
80 | ||
847b1c00 | 81 | static const struct coreclk_ratio kirkwood_coreclk_ratios[] __initconst = { |
e89406c9 SH |
82 | { .id = KIRKWOOD_CPU_TO_L2, .name = "l2clk", }, |
83 | { .id = KIRKWOOD_CPU_TO_DDR, .name = "ddrclk", } | |
84 | }; | |
85 | ||
86 | static u32 __init kirkwood_get_tclk_freq(void __iomem *sar) | |
87 | { | |
88 | u32 opt = (readl(sar) >> SAR_KIRKWOOD_TCLK_FREQ) & | |
89 | SAR_KIRKWOOD_TCLK_FREQ_MASK; | |
90 | return (opt) ? 166666667 : 200000000; | |
91 | } | |
92 | ||
847b1c00 | 93 | static const u32 kirkwood_cpu_freqs[] __initconst = { |
e89406c9 SH |
94 | 0, 0, 0, 0, |
95 | 600000000, | |
96 | 0, | |
97 | 800000000, | |
98 | 1000000000, | |
99 | 0, | |
100 | 1200000000, | |
101 | 0, 0, | |
102 | 1500000000, | |
103 | 1600000000, | |
104 | 1800000000, | |
105 | 2000000000 | |
106 | }; | |
107 | ||
108 | static u32 __init kirkwood_get_cpu_freq(void __iomem *sar) | |
109 | { | |
110 | u32 opt = SAR_KIRKWOOD_CPU_FREQ(readl(sar)); | |
111 | return kirkwood_cpu_freqs[opt]; | |
112 | } | |
113 | ||
847b1c00 | 114 | static const int kirkwood_cpu_l2_ratios[8][2] __initconst = { |
e89406c9 SH |
115 | { 0, 1 }, { 1, 2 }, { 0, 1 }, { 1, 3 }, |
116 | { 0, 1 }, { 1, 4 }, { 0, 1 }, { 0, 1 } | |
117 | }; | |
118 | ||
847b1c00 | 119 | static const int kirkwood_cpu_ddr_ratios[16][2] __initconst = { |
e89406c9 SH |
120 | { 0, 1 }, { 0, 1 }, { 1, 2 }, { 0, 1 }, |
121 | { 1, 3 }, { 0, 1 }, { 1, 4 }, { 2, 9 }, | |
122 | { 1, 5 }, { 1, 6 }, { 0, 1 }, { 0, 1 }, | |
123 | { 0, 1 }, { 0, 1 }, { 0, 1 }, { 0, 1 } | |
124 | }; | |
125 | ||
126 | static void __init kirkwood_get_clk_ratio( | |
127 | void __iomem *sar, int id, int *mult, int *div) | |
128 | { | |
129 | switch (id) { | |
130 | case KIRKWOOD_CPU_TO_L2: | |
131 | { | |
132 | u32 opt = SAR_KIRKWOOD_L2_RATIO(readl(sar)); | |
133 | *mult = kirkwood_cpu_l2_ratios[opt][0]; | |
134 | *div = kirkwood_cpu_l2_ratios[opt][1]; | |
135 | break; | |
136 | } | |
137 | case KIRKWOOD_CPU_TO_DDR: | |
138 | { | |
139 | u32 opt = (readl(sar) >> SAR_KIRKWOOD_DDR_RATIO) & | |
140 | SAR_KIRKWOOD_DDR_RATIO_MASK; | |
141 | *mult = kirkwood_cpu_ddr_ratios[opt][0]; | |
142 | *div = kirkwood_cpu_ddr_ratios[opt][1]; | |
143 | break; | |
144 | } | |
145 | } | |
146 | } | |
147 | ||
847b1c00 | 148 | static const u32 mv88f6180_cpu_freqs[] __initconst = { |
e89406c9 SH |
149 | 0, 0, 0, 0, 0, |
150 | 600000000, | |
151 | 800000000, | |
152 | 1000000000 | |
153 | }; | |
154 | ||
155 | static u32 __init mv88f6180_get_cpu_freq(void __iomem *sar) | |
156 | { | |
157 | u32 opt = (readl(sar) >> SAR_MV88F6180_CLK) & SAR_MV88F6180_CLK_MASK; | |
158 | return mv88f6180_cpu_freqs[opt]; | |
159 | } | |
160 | ||
847b1c00 | 161 | static const int mv88f6180_cpu_ddr_ratios[8][2] __initconst = { |
e89406c9 SH |
162 | { 0, 1 }, { 0, 1 }, { 0, 1 }, { 0, 1 }, |
163 | { 0, 1 }, { 1, 3 }, { 1, 4 }, { 1, 5 } | |
164 | }; | |
165 | ||
166 | static void __init mv88f6180_get_clk_ratio( | |
167 | void __iomem *sar, int id, int *mult, int *div) | |
168 | { | |
169 | switch (id) { | |
170 | case KIRKWOOD_CPU_TO_L2: | |
171 | { | |
172 | /* mv88f6180 has a fixed 1:2 CPU-to-L2 ratio */ | |
173 | *mult = 1; | |
174 | *div = 2; | |
175 | break; | |
176 | } | |
177 | case KIRKWOOD_CPU_TO_DDR: | |
178 | { | |
179 | u32 opt = (readl(sar) >> SAR_MV88F6180_CLK) & | |
180 | SAR_MV88F6180_CLK_MASK; | |
181 | *mult = mv88f6180_cpu_ddr_ratios[opt][0]; | |
182 | *div = mv88f6180_cpu_ddr_ratios[opt][1]; | |
183 | break; | |
184 | } | |
185 | } | |
186 | } | |
187 | ||
188 | static const struct coreclk_soc_desc kirkwood_coreclks = { | |
189 | .get_tclk_freq = kirkwood_get_tclk_freq, | |
190 | .get_cpu_freq = kirkwood_get_cpu_freq, | |
191 | .get_clk_ratio = kirkwood_get_clk_ratio, | |
192 | .ratios = kirkwood_coreclk_ratios, | |
193 | .num_ratios = ARRAY_SIZE(kirkwood_coreclk_ratios), | |
194 | }; | |
195 | ||
e89406c9 SH |
196 | static const struct coreclk_soc_desc mv88f6180_coreclks = { |
197 | .get_tclk_freq = kirkwood_get_tclk_freq, | |
198 | .get_cpu_freq = mv88f6180_get_cpu_freq, | |
199 | .get_clk_ratio = mv88f6180_get_clk_ratio, | |
200 | .ratios = kirkwood_coreclk_ratios, | |
201 | .num_ratios = ARRAY_SIZE(kirkwood_coreclk_ratios), | |
202 | }; | |
203 | ||
e89406c9 SH |
204 | /* |
205 | * Clock Gating Control | |
206 | */ | |
207 | ||
847b1c00 | 208 | static const struct clk_gating_soc_desc kirkwood_gating_desc[] __initconst = { |
e89406c9 SH |
209 | { "ge0", NULL, 0, 0 }, |
210 | { "pex0", NULL, 2, 0 }, | |
211 | { "usb0", NULL, 3, 0 }, | |
212 | { "sdio", NULL, 4, 0 }, | |
213 | { "tsu", NULL, 5, 0 }, | |
214 | { "runit", NULL, 7, 0 }, | |
215 | { "xor0", NULL, 8, 0 }, | |
216 | { "audio", NULL, 9, 0 }, | |
e89406c9 SH |
217 | { "sata0", NULL, 14, 0 }, |
218 | { "sata1", NULL, 15, 0 }, | |
219 | { "xor1", NULL, 16, 0 }, | |
220 | { "crypto", NULL, 17, 0 }, | |
221 | { "pex1", NULL, 18, 0 }, | |
222 | { "ge1", NULL, 19, 0 }, | |
223 | { "tdm", NULL, 20, 0 }, | |
224 | { } | |
225 | }; | |
226 | ||
e8e8a9b0 MT |
227 | |
228 | /* | |
229 | * Clock Muxing Control | |
230 | */ | |
231 | ||
232 | struct clk_muxing_soc_desc { | |
233 | const char *name; | |
234 | const char **parents; | |
235 | int num_parents; | |
236 | int shift; | |
237 | int width; | |
238 | unsigned long flags; | |
239 | }; | |
240 | ||
241 | struct clk_muxing_ctrl { | |
242 | spinlock_t *lock; | |
243 | struct clk **muxes; | |
244 | int num_muxes; | |
245 | }; | |
246 | ||
10529938 MT |
247 | static const char *powersave_parents[] = { |
248 | "cpuclk", | |
249 | "ddrclk", | |
250 | }; | |
251 | ||
252 | static const struct clk_muxing_soc_desc kirkwood_mux_desc[] __initconst = { | |
253 | { "powersave", powersave_parents, ARRAY_SIZE(powersave_parents), | |
254 | 11, 1, 0 }, | |
255 | }; | |
256 | ||
e8e8a9b0 MT |
257 | static struct clk *clk_muxing_get_src( |
258 | struct of_phandle_args *clkspec, void *data) | |
259 | { | |
260 | struct clk_muxing_ctrl *ctrl = (struct clk_muxing_ctrl *)data; | |
261 | int n; | |
262 | ||
263 | if (clkspec->args_count < 1) | |
264 | return ERR_PTR(-EINVAL); | |
265 | ||
266 | for (n = 0; n < ctrl->num_muxes; n++) { | |
267 | struct clk_mux *mux = | |
268 | to_clk_mux(__clk_get_hw(ctrl->muxes[n])); | |
269 | if (clkspec->args[0] == mux->shift) | |
270 | return ctrl->muxes[n]; | |
271 | } | |
272 | return ERR_PTR(-ENODEV); | |
273 | } | |
274 | ||
275 | static void __init kirkwood_clk_muxing_setup(struct device_node *np, | |
276 | const struct clk_muxing_soc_desc *desc) | |
277 | { | |
278 | struct clk_muxing_ctrl *ctrl; | |
279 | void __iomem *base; | |
280 | int n; | |
281 | ||
282 | base = of_iomap(np, 0); | |
283 | if (WARN_ON(!base)) | |
284 | return; | |
285 | ||
286 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
287 | if (WARN_ON(!ctrl)) | |
288 | goto ctrl_out; | |
289 | ||
290 | /* lock must already be initialized */ | |
291 | ctrl->lock = &ctrl_gating_lock; | |
292 | ||
293 | /* Count, allocate, and register clock muxes */ | |
294 | for (n = 0; desc[n].name;) | |
295 | n++; | |
296 | ||
297 | ctrl->num_muxes = n; | |
298 | ctrl->muxes = kcalloc(ctrl->num_muxes, sizeof(struct clk *), | |
299 | GFP_KERNEL); | |
300 | if (WARN_ON(!ctrl->muxes)) | |
301 | goto muxes_out; | |
302 | ||
303 | for (n = 0; n < ctrl->num_muxes; n++) { | |
304 | ctrl->muxes[n] = clk_register_mux(NULL, desc[n].name, | |
305 | desc[n].parents, desc[n].num_parents, | |
306 | desc[n].flags, base, desc[n].shift, | |
307 | desc[n].width, desc[n].flags, ctrl->lock); | |
308 | WARN_ON(IS_ERR(ctrl->muxes[n])); | |
309 | } | |
310 | ||
311 | of_clk_add_provider(np, clk_muxing_get_src, ctrl); | |
312 | ||
313 | return; | |
314 | muxes_out: | |
315 | kfree(ctrl); | |
316 | ctrl_out: | |
317 | iounmap(base); | |
318 | } | |
319 | ||
58d516ae | 320 | static void __init kirkwood_clk_init(struct device_node *np) |
e89406c9 | 321 | { |
58d516ae SH |
322 | struct device_node *cgnp = |
323 | of_find_compatible_node(NULL, NULL, "marvell,kirkwood-gating-clock"); | |
324 | ||
325 | ||
326 | if (of_device_is_compatible(np, "marvell,mv88f6180-core-clock")) | |
327 | mvebu_coreclk_setup(np, &mv88f6180_coreclks); | |
328 | else | |
329 | mvebu_coreclk_setup(np, &kirkwood_coreclks); | |
330 | ||
10529938 | 331 | if (cgnp) { |
58d516ae | 332 | mvebu_clk_gating_setup(cgnp, kirkwood_gating_desc); |
10529938 MT |
333 | kirkwood_clk_muxing_setup(cgnp, kirkwood_mux_desc); |
334 | } | |
e89406c9 | 335 | } |
58d516ae SH |
336 | CLK_OF_DECLARE(kirkwood_clk, "marvell,kirkwood-core-clock", |
337 | kirkwood_clk_init); | |
338 | CLK_OF_DECLARE(mv88f6180_clk, "marvell,mv88f6180-core-clock", | |
339 | kirkwood_clk_init); |