2 * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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.
11 #include <linux/clk-provider.h>
12 #include <linux/clkdev.h>
13 #include <linux/clk/at91_pmc.h>
15 #include <linux/of_address.h>
20 #define PERIPHERAL_MAX 64
22 #define PERIPHERAL_AT91RM9200 0
23 #define PERIPHERAL_AT91SAM9X5 1
25 #define PERIPHERAL_ID_MIN 2
26 #define PERIPHERAL_ID_MAX 31
27 #define PERIPHERAL_MASK(id) (1 << ((id) & PERIPHERAL_ID_MAX))
29 #define PERIPHERAL_RSHIFT_MASK 0x3
30 #define PERIPHERAL_RSHIFT(val) (((val) >> 16) & PERIPHERAL_RSHIFT_MASK)
32 #define PERIPHERAL_MAX_SHIFT 3
34 struct clk_peripheral
{
40 #define to_clk_peripheral(hw) container_of(hw, struct clk_peripheral, hw)
42 struct clk_sam9x5_peripheral
{
45 struct clk_range range
;
51 #define to_clk_sam9x5_peripheral(hw) \
52 container_of(hw, struct clk_sam9x5_peripheral, hw)
54 static int clk_peripheral_enable(struct clk_hw
*hw
)
56 struct clk_peripheral
*periph
= to_clk_peripheral(hw
);
57 struct at91_pmc
*pmc
= periph
->pmc
;
58 int offset
= AT91_PMC_PCER
;
61 if (id
< PERIPHERAL_ID_MIN
)
63 if (id
> PERIPHERAL_ID_MAX
)
64 offset
= AT91_PMC_PCER1
;
65 pmc_write(pmc
, offset
, PERIPHERAL_MASK(id
));
69 static void clk_peripheral_disable(struct clk_hw
*hw
)
71 struct clk_peripheral
*periph
= to_clk_peripheral(hw
);
72 struct at91_pmc
*pmc
= periph
->pmc
;
73 int offset
= AT91_PMC_PCDR
;
76 if (id
< PERIPHERAL_ID_MIN
)
78 if (id
> PERIPHERAL_ID_MAX
)
79 offset
= AT91_PMC_PCDR1
;
80 pmc_write(pmc
, offset
, PERIPHERAL_MASK(id
));
83 static int clk_peripheral_is_enabled(struct clk_hw
*hw
)
85 struct clk_peripheral
*periph
= to_clk_peripheral(hw
);
86 struct at91_pmc
*pmc
= periph
->pmc
;
87 int offset
= AT91_PMC_PCSR
;
90 if (id
< PERIPHERAL_ID_MIN
)
92 if (id
> PERIPHERAL_ID_MAX
)
93 offset
= AT91_PMC_PCSR1
;
94 return !!(pmc_read(pmc
, offset
) & PERIPHERAL_MASK(id
));
97 static const struct clk_ops peripheral_ops
= {
98 .enable
= clk_peripheral_enable
,
99 .disable
= clk_peripheral_disable
,
100 .is_enabled
= clk_peripheral_is_enabled
,
103 static struct clk
* __init
104 at91_clk_register_peripheral(struct at91_pmc
*pmc
, const char *name
,
105 const char *parent_name
, u32 id
)
107 struct clk_peripheral
*periph
;
108 struct clk
*clk
= NULL
;
109 struct clk_init_data init
;
111 if (!pmc
|| !name
|| !parent_name
|| id
> PERIPHERAL_ID_MAX
)
112 return ERR_PTR(-EINVAL
);
114 periph
= kzalloc(sizeof(*periph
), GFP_KERNEL
);
116 return ERR_PTR(-ENOMEM
);
119 init
.ops
= &peripheral_ops
;
120 init
.parent_names
= (parent_name
? &parent_name
: NULL
);
121 init
.num_parents
= (parent_name
? 1 : 0);
125 periph
->hw
.init
= &init
;
128 clk
= clk_register(NULL
, &periph
->hw
);
135 static void clk_sam9x5_peripheral_autodiv(struct clk_sam9x5_peripheral
*periph
)
138 unsigned long parent_rate
;
141 if (!periph
->auto_div
)
144 if (periph
->range
.max
) {
145 parent
= clk_get_parent_by_index(periph
->hw
.clk
, 0);
146 parent_rate
= __clk_get_rate(parent
);
150 for (; shift
< PERIPHERAL_MAX_SHIFT
; shift
++) {
151 if (parent_rate
>> shift
<= periph
->range
.max
)
156 periph
->auto_div
= false;
160 static int clk_sam9x5_peripheral_enable(struct clk_hw
*hw
)
162 struct clk_sam9x5_peripheral
*periph
= to_clk_sam9x5_peripheral(hw
);
163 struct at91_pmc
*pmc
= periph
->pmc
;
165 if (periph
->id
< PERIPHERAL_ID_MIN
)
168 pmc_write(pmc
, AT91_PMC_PCR
, (periph
->id
& AT91_PMC_PCR_PID
) |
170 AT91_PMC_PCR_DIV(periph
->div
) |
175 static void clk_sam9x5_peripheral_disable(struct clk_hw
*hw
)
177 struct clk_sam9x5_peripheral
*periph
= to_clk_sam9x5_peripheral(hw
);
178 struct at91_pmc
*pmc
= periph
->pmc
;
180 if (periph
->id
< PERIPHERAL_ID_MIN
)
183 pmc_write(pmc
, AT91_PMC_PCR
, (periph
->id
& AT91_PMC_PCR_PID
) |
187 static int clk_sam9x5_peripheral_is_enabled(struct clk_hw
*hw
)
189 struct clk_sam9x5_peripheral
*periph
= to_clk_sam9x5_peripheral(hw
);
190 struct at91_pmc
*pmc
= periph
->pmc
;
193 if (periph
->id
< PERIPHERAL_ID_MIN
)
197 pmc_write(pmc
, AT91_PMC_PCR
, (periph
->id
& AT91_PMC_PCR_PID
));
198 ret
= !!(pmc_read(pmc
, AT91_PMC_PCR
) & AT91_PMC_PCR_EN
);
205 clk_sam9x5_peripheral_recalc_rate(struct clk_hw
*hw
,
206 unsigned long parent_rate
)
208 struct clk_sam9x5_peripheral
*periph
= to_clk_sam9x5_peripheral(hw
);
209 struct at91_pmc
*pmc
= periph
->pmc
;
212 if (periph
->id
< PERIPHERAL_ID_MIN
)
216 pmc_write(pmc
, AT91_PMC_PCR
, (periph
->id
& AT91_PMC_PCR_PID
));
217 tmp
= pmc_read(pmc
, AT91_PMC_PCR
);
220 if (tmp
& AT91_PMC_PCR_EN
) {
221 periph
->div
= PERIPHERAL_RSHIFT(tmp
);
222 periph
->auto_div
= false;
224 clk_sam9x5_peripheral_autodiv(periph
);
227 return parent_rate
>> periph
->div
;
230 static long clk_sam9x5_peripheral_round_rate(struct clk_hw
*hw
,
232 unsigned long *parent_rate
)
235 unsigned long best_rate
;
236 unsigned long best_diff
;
237 unsigned long cur_rate
= *parent_rate
;
238 unsigned long cur_diff
;
239 struct clk_sam9x5_peripheral
*periph
= to_clk_sam9x5_peripheral(hw
);
241 if (periph
->id
< PERIPHERAL_ID_MIN
|| !periph
->range
.max
)
244 if (periph
->range
.max
) {
245 for (; shift
<= PERIPHERAL_MAX_SHIFT
; shift
++) {
246 cur_rate
= *parent_rate
>> shift
;
247 if (cur_rate
<= periph
->range
.max
)
252 if (rate
>= cur_rate
)
255 best_diff
= cur_rate
- rate
;
256 best_rate
= cur_rate
;
257 for (; shift
<= PERIPHERAL_MAX_SHIFT
; shift
++) {
258 cur_rate
= *parent_rate
>> shift
;
260 cur_diff
= rate
- cur_rate
;
262 cur_diff
= cur_rate
- rate
;
264 if (cur_diff
< best_diff
) {
265 best_diff
= cur_diff
;
266 best_rate
= cur_rate
;
269 if (!best_diff
|| cur_rate
< rate
)
276 static int clk_sam9x5_peripheral_set_rate(struct clk_hw
*hw
,
278 unsigned long parent_rate
)
281 struct clk_sam9x5_peripheral
*periph
= to_clk_sam9x5_peripheral(hw
);
282 if (periph
->id
< PERIPHERAL_ID_MIN
|| !periph
->range
.max
) {
283 if (parent_rate
== rate
)
289 if (periph
->range
.max
&& rate
> periph
->range
.max
)
292 for (shift
= 0; shift
<= PERIPHERAL_MAX_SHIFT
; shift
++) {
293 if (parent_rate
>> shift
== rate
) {
294 periph
->auto_div
= false;
303 static const struct clk_ops sam9x5_peripheral_ops
= {
304 .enable
= clk_sam9x5_peripheral_enable
,
305 .disable
= clk_sam9x5_peripheral_disable
,
306 .is_enabled
= clk_sam9x5_peripheral_is_enabled
,
307 .recalc_rate
= clk_sam9x5_peripheral_recalc_rate
,
308 .round_rate
= clk_sam9x5_peripheral_round_rate
,
309 .set_rate
= clk_sam9x5_peripheral_set_rate
,
312 static struct clk
* __init
313 at91_clk_register_sam9x5_peripheral(struct at91_pmc
*pmc
, const char *name
,
314 const char *parent_name
, u32 id
,
315 const struct clk_range
*range
)
317 struct clk_sam9x5_peripheral
*periph
;
318 struct clk
*clk
= NULL
;
319 struct clk_init_data init
;
321 if (!pmc
|| !name
|| !parent_name
)
322 return ERR_PTR(-EINVAL
);
324 periph
= kzalloc(sizeof(*periph
), GFP_KERNEL
);
326 return ERR_PTR(-ENOMEM
);
329 init
.ops
= &sam9x5_peripheral_ops
;
330 init
.parent_names
= (parent_name
? &parent_name
: NULL
);
331 init
.num_parents
= (parent_name
? 1 : 0);
335 periph
->hw
.init
= &init
;
338 periph
->auto_div
= true;
339 periph
->range
= *range
;
341 clk
= clk_register(NULL
, &periph
->hw
);
345 clk_sam9x5_peripheral_autodiv(periph
);
351 of_at91_clk_periph_setup(struct device_node
*np
, struct at91_pmc
*pmc
, u8 type
)
356 const char *parent_name
;
358 struct device_node
*periphclknp
;
360 parent_name
= of_clk_get_parent_name(np
, 0);
364 num
= of_get_child_count(np
);
365 if (!num
|| num
> PERIPHERAL_MAX
)
368 for_each_child_of_node(np
, periphclknp
) {
369 if (of_property_read_u32(periphclknp
, "reg", &id
))
372 if (id
>= PERIPHERAL_MAX
)
375 if (of_property_read_string(np
, "clock-output-names", &name
))
376 name
= periphclknp
->name
;
378 if (type
== PERIPHERAL_AT91RM9200
) {
379 clk
= at91_clk_register_peripheral(pmc
, name
,
382 struct clk_range range
= CLK_RANGE(0, 0);
384 of_at91_get_clk_range(periphclknp
,
385 "atmel,clk-output-range",
388 clk
= at91_clk_register_sam9x5_peripheral(pmc
, name
,
396 of_clk_add_provider(periphclknp
, of_clk_src_simple_get
, clk
);
400 void __init
of_at91rm9200_clk_periph_setup(struct device_node
*np
,
401 struct at91_pmc
*pmc
)
403 of_at91_clk_periph_setup(np
, pmc
, PERIPHERAL_AT91RM9200
);
406 void __init
of_at91sam9x5_clk_periph_setup(struct device_node
*np
,
407 struct at91_pmc
*pmc
)
409 of_at91_clk_periph_setup(np
, pmc
, PERIPHERAL_AT91SAM9X5
);