2 * Helper routines for R-Car sound ADG.
4 * Copyright (C) 2013 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/clk-provider.h>
25 #define BRRx_MASK(x) (0x3FF & x)
27 static struct rsnd_mod_ops adg_ops
= {
32 struct clk
*clk
[CLKMAX
];
33 struct clk
*clkout
[CLKOUTMAX
];
34 struct clk_onecell_data onecell
;
37 int rbga_rate_for_441khz
; /* RBGA */
38 int rbgb_rate_for_48khz
; /* RBGB */
41 #define for_each_rsnd_clk(pos, adg, i) \
44 ((pos) = adg->clk[i]); \
46 #define for_each_rsnd_clkout(pos, adg, i) \
49 ((pos) = adg->clkout[i]); \
51 #define rsnd_priv_to_adg(priv) ((struct rsnd_adg *)(priv)->adg)
53 static u32
rsnd_adg_calculate_rbgx(unsigned long div
)
60 for (i
= 3; i
>= 0; i
--) {
62 if (0 == (div
% ratio
))
63 return (u32
)((i
<< 8) | ((div
/ ratio
) - 1));
69 static u32
rsnd_adg_ssi_ws_timing_gen2(struct rsnd_dai_stream
*io
)
71 struct rsnd_mod
*mod
= rsnd_io_to_mod_ssi(io
);
72 int id
= rsnd_mod_id(mod
);
75 if (rsnd_ssi_is_pin_sharing(io
)) {
90 return (0x6 + ws
) << 8;
93 int rsnd_adg_set_cmd_timsel_gen2(struct rsnd_mod
*mod
,
94 struct rsnd_dai_stream
*io
)
96 struct rsnd_priv
*priv
= rsnd_mod_to_priv(mod
);
97 struct rsnd_adg
*adg
= rsnd_priv_to_adg(priv
);
98 struct rsnd_mod
*adg_mod
= rsnd_mod_get(adg
);
99 int id
= rsnd_mod_id(mod
);
100 int shift
= (id
% 2) ? 16 : 0;
103 val
= rsnd_adg_ssi_ws_timing_gen2(io
);
106 mask
= 0xffff << shift
;
108 rsnd_mod_bset(adg_mod
, CMDOUT_TIMSEL
, mask
, val
);
113 static int rsnd_adg_set_src_timsel_gen2(struct rsnd_mod
*src_mod
,
114 struct rsnd_dai_stream
*io
,
117 struct rsnd_priv
*priv
= rsnd_mod_to_priv(src_mod
);
118 struct rsnd_adg
*adg
= rsnd_priv_to_adg(priv
);
119 struct rsnd_mod
*adg_mod
= rsnd_mod_get(adg
);
120 int is_play
= rsnd_io_is_play(io
);
121 int id
= rsnd_mod_id(src_mod
);
122 int shift
= (id
% 2) ? 16 : 0;
126 rsnd_mod_confirm_src(src_mod
);
128 ws
= rsnd_adg_ssi_ws_timing_gen2(io
);
130 in
= (is_play
) ? timsel
: ws
;
131 out
= (is_play
) ? ws
: timsel
;
135 mask
= 0xffff << shift
;
139 rsnd_mod_bset(adg_mod
, SRCIN_TIMSEL0
, mask
, in
);
140 rsnd_mod_bset(adg_mod
, SRCOUT_TIMSEL0
, mask
, out
);
143 rsnd_mod_bset(adg_mod
, SRCIN_TIMSEL1
, mask
, in
);
144 rsnd_mod_bset(adg_mod
, SRCOUT_TIMSEL1
, mask
, out
);
147 rsnd_mod_bset(adg_mod
, SRCIN_TIMSEL2
, mask
, in
);
148 rsnd_mod_bset(adg_mod
, SRCOUT_TIMSEL2
, mask
, out
);
151 rsnd_mod_bset(adg_mod
, SRCIN_TIMSEL3
, mask
, in
);
152 rsnd_mod_bset(adg_mod
, SRCOUT_TIMSEL3
, mask
, out
);
155 rsnd_mod_bset(adg_mod
, SRCIN_TIMSEL4
, mask
, in
);
156 rsnd_mod_bset(adg_mod
, SRCOUT_TIMSEL4
, mask
, out
);
163 int rsnd_adg_set_convert_clk_gen2(struct rsnd_mod
*src_mod
,
164 struct rsnd_dai_stream
*io
,
165 unsigned int src_rate
,
166 unsigned int dst_rate
)
168 struct rsnd_priv
*priv
= rsnd_mod_to_priv(src_mod
);
169 struct rsnd_adg
*adg
= rsnd_priv_to_adg(priv
);
170 struct rsnd_mod
*adg_mod
= rsnd_mod_get(adg
);
171 struct device
*dev
= rsnd_priv_to_dev(priv
);
172 int idx
, sel
, div
, step
, ret
;
174 unsigned int min
, diff
;
175 unsigned int sel_rate
[] = {
176 clk_get_rate(adg
->clk
[CLKA
]), /* 0000: CLKA */
177 clk_get_rate(adg
->clk
[CLKB
]), /* 0001: CLKB */
178 clk_get_rate(adg
->clk
[CLKC
]), /* 0010: CLKC */
179 adg
->rbga_rate_for_441khz
, /* 0011: RBGA */
180 adg
->rbgb_rate_for_48khz
, /* 0100: RBGB */
183 rsnd_mod_confirm_src(src_mod
);
188 for (sel
= 0; sel
< ARRAY_SIZE(sel_rate
); sel
++) {
195 for (div
= 2; div
<= 98304; div
+= step
) {
196 diff
= abs(src_rate
- sel_rate
[sel
] / div
);
198 val
= (sel
<< 8) | idx
;
200 en
= 1 << (sel
+ 1); /* fixme */
204 * step of 0_0000 / 0_0001 / 0_1101
207 if ((idx
> 2) && (idx
% 2))
218 dev_err(dev
, "no Input clock\n");
222 ret
= rsnd_adg_set_src_timsel_gen2(src_mod
, io
, val
);
224 dev_err(dev
, "timsel error\n");
228 rsnd_mod_bset(adg_mod
, DIV_EN
, en
, en
);
230 dev_dbg(dev
, "convert rate %d <-> %d\n", src_rate
, dst_rate
);
235 int rsnd_adg_set_convert_timing_gen2(struct rsnd_mod
*src_mod
,
236 struct rsnd_dai_stream
*io
)
238 u32 val
= rsnd_adg_ssi_ws_timing_gen2(io
);
240 rsnd_mod_confirm_src(src_mod
);
242 return rsnd_adg_set_src_timsel_gen2(src_mod
, io
, val
);
245 static void rsnd_adg_set_ssi_clk(struct rsnd_mod
*ssi_mod
, u32 val
)
247 struct rsnd_priv
*priv
= rsnd_mod_to_priv(ssi_mod
);
248 struct rsnd_adg
*adg
= rsnd_priv_to_adg(priv
);
249 struct rsnd_mod
*adg_mod
= rsnd_mod_get(adg
);
250 int id
= rsnd_mod_id(ssi_mod
);
251 int shift
= (id
% 4) * 8;
252 u32 mask
= 0xFF << shift
;
254 rsnd_mod_confirm_ssi(ssi_mod
);
259 * SSI 8 is not connected to ADG.
260 * it works with SSI 7
267 rsnd_mod_bset(adg_mod
, AUDIO_CLK_SEL0
, mask
, val
);
270 rsnd_mod_bset(adg_mod
, AUDIO_CLK_SEL1
, mask
, val
);
273 rsnd_mod_bset(adg_mod
, AUDIO_CLK_SEL2
, mask
, val
);
278 int rsnd_adg_ssi_clk_stop(struct rsnd_mod
*mod
)
281 * "mod" = "ssi" here.
282 * we can get "ssi id" from mod
284 rsnd_adg_set_ssi_clk(mod
, 0);
289 int rsnd_adg_ssi_clk_try_start(struct rsnd_mod
*mod
, unsigned int rate
)
291 struct rsnd_priv
*priv
= rsnd_mod_to_priv(mod
);
292 struct rsnd_adg
*adg
= rsnd_priv_to_adg(priv
);
293 struct device
*dev
= rsnd_priv_to_dev(priv
);
304 dev_dbg(dev
, "request clock = %d\n", rate
);
307 * find suitable clock from
308 * AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC/AUDIO_CLKI.
311 for_each_rsnd_clk(clk
, adg
, i
) {
312 if (rate
== clk_get_rate(clk
)) {
319 * find divided clock from BRGA/BRGB
321 if (rate
== adg
->rbga_rate_for_441khz
) {
326 if (rate
== adg
->rbgb_rate_for_48khz
) {
336 * This "mod" = "ssi" here.
337 * we can get "ssi id" from mod
339 rsnd_adg_set_ssi_clk(mod
, data
);
341 dev_dbg(dev
, "ADG: %s[%d] selects 0x%x for %d\n",
342 rsnd_mod_name(mod
), rsnd_mod_id(mod
),
348 static void rsnd_adg_get_clkin(struct rsnd_priv
*priv
,
349 struct rsnd_adg
*adg
)
351 struct device
*dev
= rsnd_priv_to_dev(priv
);
353 static const char * const clk_name
[] = {
361 for (i
= 0; i
< CLKMAX
; i
++) {
362 clk
= devm_clk_get(dev
, clk_name
[i
]);
363 adg
->clk
[i
] = IS_ERR(clk
) ? NULL
: clk
;
366 for_each_rsnd_clk(clk
, adg
, i
) {
367 ret
= clk_prepare_enable(clk
);
369 dev_warn(dev
, "can't use clk %d\n", i
);
371 dev_dbg(dev
, "clk %d : %p : %ld\n", i
, clk
, clk_get_rate(clk
));
375 static void rsnd_adg_get_clkout(struct rsnd_priv
*priv
,
376 struct rsnd_adg
*adg
)
379 struct rsnd_mod
*adg_mod
= rsnd_mod_get(adg
);
380 struct device
*dev
= rsnd_priv_to_dev(priv
);
381 struct device_node
*np
= dev
->of_node
;
382 u32 ckr
, rbgx
, rbga
, rbgb
;
383 u32 rate
, req_rate
= 0, div
;
385 unsigned long req_48kHz_rate
, req_441kHz_rate
;
387 const char *parent_clk_name
= NULL
;
388 static const char * const clkout_name
[] = {
389 [CLKOUT
] = "audio_clkout",
390 [CLKOUT1
] = "audio_clkout1",
391 [CLKOUT2
] = "audio_clkout2",
392 [CLKOUT3
] = "audio_clkout3",
401 of_property_read_u32(np
, "#clock-cells", &count
);
404 * ADG supports BRRA/BRRB output only
405 * this means all clkout0/1/2/3 will be same rate
407 of_property_read_u32(np
, "clock-frequency", &req_rate
);
410 if (0 == (req_rate
% 44100))
411 req_441kHz_rate
= req_rate
;
412 if (0 == (req_rate
% 48000))
413 req_48kHz_rate
= req_rate
;
416 * This driver is assuming that AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC
417 * have 44.1kHz or 48kHz base clocks for now.
419 * SSI itself can divide parent clock by 1/1 - 1/16
421 * rsnd_adg_ssi_clk_try_start()
422 * rsnd_ssi_master_clk_start()
425 rbga
= 2; /* default 1/6 */
426 rbgb
= 2; /* default 1/6 */
427 adg
->rbga_rate_for_441khz
= 0;
428 adg
->rbgb_rate_for_48khz
= 0;
429 for_each_rsnd_clk(clk
, adg
, i
) {
430 rate
= clk_get_rate(clk
);
432 if (0 == rate
) /* not used */
436 if (!adg
->rbga_rate_for_441khz
&& (0 == rate
% 44100)) {
439 div
= rate
/ req_441kHz_rate
;
440 rbgx
= rsnd_adg_calculate_rbgx(div
);
441 if (BRRx_MASK(rbgx
) == rbgx
) {
443 adg
->rbga_rate_for_441khz
= rate
/ div
;
444 ckr
|= brg_table
[i
] << 20;
446 parent_clk_name
= __clk_get_name(clk
);
451 if (!adg
->rbgb_rate_for_48khz
&& (0 == rate
% 48000)) {
454 div
= rate
/ req_48kHz_rate
;
455 rbgx
= rsnd_adg_calculate_rbgx(div
);
456 if (BRRx_MASK(rbgx
) == rbgx
) {
458 adg
->rbgb_rate_for_48khz
= rate
/ div
;
459 ckr
|= brg_table
[i
] << 16;
460 if (req_48kHz_rate
) {
461 parent_clk_name
= __clk_get_name(clk
);
469 * ADG supports BRRA/BRRB output only.
470 * this means all clkout0/1/2/3 will be * same rate
477 clk
= clk_register_fixed_rate(dev
, clkout_name
[CLKOUT
],
480 0 : CLK_IS_ROOT
, req_rate
);
482 adg
->clkout
[CLKOUT
] = clk
;
483 of_clk_add_provider(np
, of_clk_src_simple_get
, clk
);
490 for (i
= 0; i
< CLKOUTMAX
; i
++) {
491 clk
= clk_register_fixed_rate(dev
, clkout_name
[i
],
497 adg
->onecell
.clks
= adg
->clkout
;
498 adg
->onecell
.clk_num
= CLKOUTMAX
;
500 adg
->clkout
[i
] = clk
;
502 of_clk_add_provider(np
, of_clk_src_onecell_get
,
508 rsnd_mod_bset(adg_mod
, SSICKR
, 0x00FF0000, ckr
);
509 rsnd_mod_write(adg_mod
, BRRA
, rbga
);
510 rsnd_mod_write(adg_mod
, BRRB
, rbgb
);
512 for_each_rsnd_clkout(clk
, adg
, i
)
513 dev_dbg(dev
, "clkout %d : %p : %ld\n", i
, clk
, clk_get_rate(clk
));
514 dev_dbg(dev
, "SSICKR = 0x%08x, BRRA/BRRB = 0x%x/0x%x\n",
518 int rsnd_adg_probe(struct rsnd_priv
*priv
)
520 struct rsnd_adg
*adg
;
521 struct device
*dev
= rsnd_priv_to_dev(priv
);
523 adg
= devm_kzalloc(dev
, sizeof(*adg
), GFP_KERNEL
);
525 dev_err(dev
, "ADG allocate failed\n");
530 * ADG is special module.
531 * Use ADG mod without rsnd_mod_init() to make debug easy
532 * for rsnd_write/rsnd_read
534 adg
->mod
.ops
= &adg_ops
;
535 adg
->mod
.priv
= priv
;
537 rsnd_adg_get_clkin(priv
, adg
);
538 rsnd_adg_get_clkout(priv
, adg
);
545 void rsnd_adg_remove(struct rsnd_priv
*priv
)
547 struct rsnd_adg
*adg
= rsnd_priv_to_adg(priv
);
551 for_each_rsnd_clk(clk
, adg
, i
) {
552 clk_disable_unprepare(clk
);
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