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1f22f8bb BB |
1 | /* |
2 | * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/clk-provider.h> | |
12 | #include <linux/clkdev.h> | |
13 | #include <linux/clk/at91_pmc.h> | |
14 | #include <linux/of.h> | |
1bdf0232 BB |
15 | #include <linux/mfd/syscon.h> |
16 | #include <linux/regmap.h> | |
1f22f8bb BB |
17 | |
18 | #include "pmc.h" | |
19 | ||
20 | #define PROG_SOURCE_MAX 5 | |
21 | #define PROG_ID_MAX 7 | |
22 | ||
23 | #define PROG_STATUS_MASK(id) (1 << ((id) + 8)) | |
24 | #define PROG_PRES_MASK 0x7 | |
1bdf0232 | 25 | #define PROG_PRES(layout, pckr) ((pckr >> layout->pres_shift) & PROG_PRES_MASK) |
1f22f8bb BB |
26 | #define PROG_MAX_RM9200_CSS 3 |
27 | ||
28 | struct clk_programmable_layout { | |
29 | u8 pres_shift; | |
30 | u8 css_mask; | |
31 | u8 have_slck_mck; | |
32 | }; | |
33 | ||
34 | struct clk_programmable { | |
35 | struct clk_hw hw; | |
1bdf0232 | 36 | struct regmap *regmap; |
1f22f8bb | 37 | u8 id; |
1f22f8bb BB |
38 | const struct clk_programmable_layout *layout; |
39 | }; | |
40 | ||
41 | #define to_clk_programmable(hw) container_of(hw, struct clk_programmable, hw) | |
42 | ||
1f22f8bb BB |
43 | static unsigned long clk_programmable_recalc_rate(struct clk_hw *hw, |
44 | unsigned long parent_rate) | |
45 | { | |
1f22f8bb | 46 | struct clk_programmable *prog = to_clk_programmable(hw); |
1bdf0232 BB |
47 | unsigned int pckr; |
48 | ||
49 | regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr); | |
1f22f8bb | 50 | |
1bdf0232 | 51 | return parent_rate >> PROG_PRES(prog->layout, pckr); |
1f22f8bb BB |
52 | } |
53 | ||
0817b62c BB |
54 | static int clk_programmable_determine_rate(struct clk_hw *hw, |
55 | struct clk_rate_request *req) | |
1f22f8bb | 56 | { |
d0979335 | 57 | struct clk_hw *parent; |
419f6129 BB |
58 | long best_rate = -EINVAL; |
59 | unsigned long parent_rate; | |
60 | unsigned long tmp_rate; | |
61 | int shift; | |
62 | int i; | |
63 | ||
497295af | 64 | for (i = 0; i < clk_hw_get_num_parents(hw); i++) { |
d0979335 | 65 | parent = clk_hw_get_parent_by_index(hw, i); |
419f6129 BB |
66 | if (!parent) |
67 | continue; | |
68 | ||
d0979335 | 69 | parent_rate = clk_hw_get_rate(parent); |
419f6129 BB |
70 | for (shift = 0; shift < PROG_PRES_MASK; shift++) { |
71 | tmp_rate = parent_rate >> shift; | |
0817b62c | 72 | if (tmp_rate <= req->rate) |
419f6129 BB |
73 | break; |
74 | } | |
1f22f8bb | 75 | |
0817b62c | 76 | if (tmp_rate > req->rate) |
419f6129 | 77 | continue; |
1f22f8bb | 78 | |
0817b62c BB |
79 | if (best_rate < 0 || |
80 | (req->rate - tmp_rate) < (req->rate - best_rate)) { | |
419f6129 | 81 | best_rate = tmp_rate; |
0817b62c | 82 | req->best_parent_rate = parent_rate; |
d0979335 | 83 | req->best_parent_hw = parent; |
1f22f8bb BB |
84 | } |
85 | ||
419f6129 | 86 | if (!best_rate) |
1f22f8bb BB |
87 | break; |
88 | } | |
89 | ||
0817b62c BB |
90 | if (best_rate < 0) |
91 | return best_rate; | |
92 | ||
93 | req->rate = best_rate; | |
94 | return 0; | |
1f22f8bb BB |
95 | } |
96 | ||
97 | static int clk_programmable_set_parent(struct clk_hw *hw, u8 index) | |
98 | { | |
99 | struct clk_programmable *prog = to_clk_programmable(hw); | |
100 | const struct clk_programmable_layout *layout = prog->layout; | |
1bdf0232 BB |
101 | unsigned int mask = layout->css_mask; |
102 | unsigned int pckr = 0; | |
cce6db80 JJH |
103 | |
104 | if (layout->have_slck_mck) | |
1bdf0232 | 105 | mask |= AT91_PMC_CSSMCK_MCK; |
cce6db80 | 106 | |
1f22f8bb | 107 | if (index > layout->css_mask) { |
1bdf0232 | 108 | if (index > PROG_MAX_RM9200_CSS && !layout->have_slck_mck) |
1f22f8bb | 109 | return -EINVAL; |
1bdf0232 BB |
110 | |
111 | pckr |= AT91_PMC_CSSMCK_MCK; | |
1f22f8bb BB |
112 | } |
113 | ||
1bdf0232 BB |
114 | regmap_update_bits(prog->regmap, AT91_PMC_PCKR(prog->id), mask, pckr); |
115 | ||
1f22f8bb BB |
116 | return 0; |
117 | } | |
118 | ||
119 | static u8 clk_programmable_get_parent(struct clk_hw *hw) | |
120 | { | |
1f22f8bb | 121 | struct clk_programmable *prog = to_clk_programmable(hw); |
1f22f8bb | 122 | const struct clk_programmable_layout *layout = prog->layout; |
1bdf0232 BB |
123 | unsigned int pckr; |
124 | u8 ret; | |
125 | ||
126 | regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr); | |
127 | ||
128 | ret = pckr & layout->css_mask; | |
1f22f8bb | 129 | |
1bdf0232 | 130 | if (layout->have_slck_mck && (pckr & AT91_PMC_CSSMCK_MCK) && !ret) |
cce6db80 | 131 | ret = PROG_MAX_RM9200_CSS + 1; |
1f22f8bb BB |
132 | |
133 | return ret; | |
134 | } | |
135 | ||
136 | static int clk_programmable_set_rate(struct clk_hw *hw, unsigned long rate, | |
137 | unsigned long parent_rate) | |
138 | { | |
139 | struct clk_programmable *prog = to_clk_programmable(hw); | |
cce6db80 | 140 | const struct clk_programmable_layout *layout = prog->layout; |
141c71dd | 141 | unsigned long div = parent_rate / rate; |
1bdf0232 | 142 | unsigned int pckr; |
1f22f8bb | 143 | int shift = 0; |
1bdf0232 BB |
144 | |
145 | regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr); | |
1f22f8bb | 146 | |
141c71dd JJH |
147 | if (!div) |
148 | return -EINVAL; | |
1f22f8bb | 149 | |
141c71dd | 150 | shift = fls(div) - 1; |
1f22f8bb | 151 | |
1bdf0232 | 152 | if (div != (1 << shift)) |
141c71dd | 153 | return -EINVAL; |
1f22f8bb | 154 | |
141c71dd JJH |
155 | if (shift >= PROG_PRES_MASK) |
156 | return -EINVAL; | |
1f22f8bb | 157 | |
1bdf0232 BB |
158 | regmap_update_bits(prog->regmap, AT91_PMC_PCKR(prog->id), |
159 | PROG_PRES_MASK << layout->pres_shift, | |
160 | shift << layout->pres_shift); | |
cce6db80 | 161 | |
1f22f8bb BB |
162 | return 0; |
163 | } | |
164 | ||
165 | static const struct clk_ops programmable_ops = { | |
1f22f8bb | 166 | .recalc_rate = clk_programmable_recalc_rate, |
419f6129 | 167 | .determine_rate = clk_programmable_determine_rate, |
1f22f8bb BB |
168 | .get_parent = clk_programmable_get_parent, |
169 | .set_parent = clk_programmable_set_parent, | |
170 | .set_rate = clk_programmable_set_rate, | |
171 | }; | |
172 | ||
173 | static struct clk * __init | |
1bdf0232 | 174 | at91_clk_register_programmable(struct regmap *regmap, |
1f22f8bb BB |
175 | const char *name, const char **parent_names, |
176 | u8 num_parents, u8 id, | |
177 | const struct clk_programmable_layout *layout) | |
178 | { | |
1f22f8bb BB |
179 | struct clk_programmable *prog; |
180 | struct clk *clk = NULL; | |
181 | struct clk_init_data init; | |
1f22f8bb BB |
182 | |
183 | if (id > PROG_ID_MAX) | |
184 | return ERR_PTR(-EINVAL); | |
185 | ||
186 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); | |
187 | if (!prog) | |
188 | return ERR_PTR(-ENOMEM); | |
189 | ||
190 | init.name = name; | |
191 | init.ops = &programmable_ops; | |
192 | init.parent_names = parent_names; | |
193 | init.num_parents = num_parents; | |
194 | init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE; | |
195 | ||
196 | prog->id = id; | |
197 | prog->layout = layout; | |
198 | prog->hw.init = &init; | |
1bdf0232 | 199 | prog->regmap = regmap; |
1f22f8bb BB |
200 | |
201 | clk = clk_register(NULL, &prog->hw); | |
202 | if (IS_ERR(clk)) | |
203 | kfree(prog); | |
204 | ||
205 | return clk; | |
206 | } | |
207 | ||
208 | static const struct clk_programmable_layout at91rm9200_programmable_layout = { | |
209 | .pres_shift = 2, | |
210 | .css_mask = 0x3, | |
211 | .have_slck_mck = 0, | |
212 | }; | |
213 | ||
214 | static const struct clk_programmable_layout at91sam9g45_programmable_layout = { | |
215 | .pres_shift = 2, | |
216 | .css_mask = 0x3, | |
217 | .have_slck_mck = 1, | |
218 | }; | |
219 | ||
220 | static const struct clk_programmable_layout at91sam9x5_programmable_layout = { | |
221 | .pres_shift = 4, | |
222 | .css_mask = 0x7, | |
223 | .have_slck_mck = 0, | |
224 | }; | |
225 | ||
226 | static void __init | |
1bdf0232 | 227 | of_at91_clk_prog_setup(struct device_node *np, |
1f22f8bb BB |
228 | const struct clk_programmable_layout *layout) |
229 | { | |
230 | int num; | |
231 | u32 id; | |
1f22f8bb | 232 | struct clk *clk; |
8c1b1e54 | 233 | unsigned int num_parents; |
1f22f8bb BB |
234 | const char *parent_names[PROG_SOURCE_MAX]; |
235 | const char *name; | |
236 | struct device_node *progclknp; | |
1bdf0232 | 237 | struct regmap *regmap; |
1f22f8bb | 238 | |
51a43be9 | 239 | num_parents = of_clk_get_parent_count(np); |
8c1b1e54 | 240 | if (num_parents == 0 || num_parents > PROG_SOURCE_MAX) |
1f22f8bb BB |
241 | return; |
242 | ||
f0557fbe | 243 | of_clk_parent_fill(np, parent_names, num_parents); |
1f22f8bb BB |
244 | |
245 | num = of_get_child_count(np); | |
246 | if (!num || num > (PROG_ID_MAX + 1)) | |
247 | return; | |
248 | ||
1bdf0232 BB |
249 | regmap = syscon_node_to_regmap(of_get_parent(np)); |
250 | if (IS_ERR(regmap)) | |
251 | return; | |
252 | ||
1f22f8bb BB |
253 | for_each_child_of_node(np, progclknp) { |
254 | if (of_property_read_u32(progclknp, "reg", &id)) | |
255 | continue; | |
256 | ||
257 | if (of_property_read_string(np, "clock-output-names", &name)) | |
258 | name = progclknp->name; | |
259 | ||
1bdf0232 | 260 | clk = at91_clk_register_programmable(regmap, name, |
1f22f8bb BB |
261 | parent_names, num_parents, |
262 | id, layout); | |
263 | if (IS_ERR(clk)) | |
264 | continue; | |
265 | ||
266 | of_clk_add_provider(progclknp, of_clk_src_simple_get, clk); | |
267 | } | |
268 | } | |
269 | ||
270 | ||
1bdf0232 | 271 | static void __init of_at91rm9200_clk_prog_setup(struct device_node *np) |
1f22f8bb | 272 | { |
1bdf0232 | 273 | of_at91_clk_prog_setup(np, &at91rm9200_programmable_layout); |
1f22f8bb | 274 | } |
1bdf0232 BB |
275 | CLK_OF_DECLARE(at91rm9200_clk_prog, "atmel,at91rm9200-clk-programmable", |
276 | of_at91rm9200_clk_prog_setup); | |
1f22f8bb | 277 | |
1bdf0232 | 278 | static void __init of_at91sam9g45_clk_prog_setup(struct device_node *np) |
1f22f8bb | 279 | { |
1bdf0232 | 280 | of_at91_clk_prog_setup(np, &at91sam9g45_programmable_layout); |
1f22f8bb | 281 | } |
1bdf0232 BB |
282 | CLK_OF_DECLARE(at91sam9g45_clk_prog, "atmel,at91sam9g45-clk-programmable", |
283 | of_at91sam9g45_clk_prog_setup); | |
1f22f8bb | 284 | |
1bdf0232 | 285 | static void __init of_at91sam9x5_clk_prog_setup(struct device_node *np) |
1f22f8bb | 286 | { |
1bdf0232 | 287 | of_at91_clk_prog_setup(np, &at91sam9x5_programmable_layout); |
1f22f8bb | 288 | } |
1bdf0232 BB |
289 | CLK_OF_DECLARE(at91sam9x5_clk_prog, "atmel,at91sam9x5-clk-programmable", |
290 | of_at91sam9x5_clk_prog_setup); |