1/*
2 * ctu.c
3 *
4 * Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include "rsnd.h"
11
12#define CTU_NAME_SIZE	16
13#define CTU_NAME "ctu"
14
15struct rsnd_ctu {
16	struct rsnd_ctu_platform_info *info; /* rcar_snd.h */
17	struct rsnd_mod mod;
18};
19
20#define rsnd_ctu_nr(priv) ((priv)->ctu_nr)
21#define for_each_rsnd_ctu(pos, priv, i)					\
22	for ((i) = 0;							\
23	     ((i) < rsnd_ctu_nr(priv)) &&				\
24		     ((pos) = (struct rsnd_ctu *)(priv)->ctu + i);	\
25	     i++)
26
27#define rsnd_ctu_initialize_lock(mod)	__rsnd_ctu_initialize_lock(mod, 1)
28#define rsnd_ctu_initialize_unlock(mod)	__rsnd_ctu_initialize_lock(mod, 0)
29static void __rsnd_ctu_initialize_lock(struct rsnd_mod *mod, u32 enable)
30{
31	rsnd_mod_write(mod, CTU_CTUIR, enable);
32}
33
34static int rsnd_ctu_init(struct rsnd_mod *mod,
35			 struct rsnd_dai_stream *io,
36			 struct rsnd_priv *priv)
37{
38	rsnd_mod_power_on(mod);
39
40	rsnd_ctu_initialize_lock(mod);
41
42	rsnd_mod_write(mod, CTU_ADINR, rsnd_get_adinr_chan(mod, io));
43
44	rsnd_ctu_initialize_unlock(mod);
45
46	return 0;
47}
48
49static int rsnd_ctu_quit(struct rsnd_mod *mod,
50			 struct rsnd_dai_stream *io,
51			 struct rsnd_priv *priv)
52{
53	rsnd_mod_power_off(mod);
54
55	return 0;
56}
57
58static struct rsnd_mod_ops rsnd_ctu_ops = {
59	.name		= CTU_NAME,
60	.init		= rsnd_ctu_init,
61	.quit		= rsnd_ctu_quit,
62};
63
64struct rsnd_mod *rsnd_ctu_mod_get(struct rsnd_priv *priv, int id)
65{
66	if (WARN_ON(id < 0 || id >= rsnd_ctu_nr(priv)))
67		id = 0;
68
69	return rsnd_mod_get((struct rsnd_ctu *)(priv->ctu) + id);
70}
71
72static void rsnd_of_parse_ctu(struct platform_device *pdev,
73		       const struct rsnd_of_data *of_data,
74		       struct rsnd_priv *priv)
75{
76	struct device_node *node;
77	struct rsnd_ctu_platform_info *ctu_info;
78	struct rcar_snd_info *info = rsnd_priv_to_info(priv);
79	struct device *dev = &pdev->dev;
80	int nr;
81
82	if (!of_data)
83		return;
84
85	node = of_get_child_by_name(dev->of_node, "rcar_sound,ctu");
86	if (!node)
87		return;
88
89	nr = of_get_child_count(node);
90	if (!nr)
91		goto rsnd_of_parse_ctu_end;
92
93	ctu_info = devm_kzalloc(dev,
94				sizeof(struct rsnd_ctu_platform_info) * nr,
95				GFP_KERNEL);
96	if (!ctu_info) {
97		dev_err(dev, "ctu info allocation error\n");
98		goto rsnd_of_parse_ctu_end;
99	}
100
101	info->ctu_info		= ctu_info;
102	info->ctu_info_nr	= nr;
103
104rsnd_of_parse_ctu_end:
105	of_node_put(node);
106
107}
108
109int rsnd_ctu_probe(struct platform_device *pdev,
110		   const struct rsnd_of_data *of_data,
111		   struct rsnd_priv *priv)
112{
113	struct rcar_snd_info *info = rsnd_priv_to_info(priv);
114	struct device *dev = rsnd_priv_to_dev(priv);
115	struct rsnd_ctu *ctu;
116	struct clk *clk;
117	char name[CTU_NAME_SIZE];
118	int i, nr, ret;
119
120	/* This driver doesn't support Gen1 at this point */
121	if (rsnd_is_gen1(priv))
122		return 0;
123
124	rsnd_of_parse_ctu(pdev, of_data, priv);
125
126	nr = info->ctu_info_nr;
127	if (!nr)
128		return 0;
129
130	ctu = devm_kzalloc(dev, sizeof(*ctu) * nr, GFP_KERNEL);
131	if (!ctu)
132		return -ENOMEM;
133
134	priv->ctu_nr	= nr;
135	priv->ctu	= ctu;
136
137	for_each_rsnd_ctu(ctu, priv, i) {
138		/*
139		 * CTU00, CTU01, CTU02, CTU03 => CTU0
140		 * CTU10, CTU11, CTU12, CTU13 => CTU1
141		 */
142		snprintf(name, CTU_NAME_SIZE, "%s.%d",
143			 CTU_NAME, i / 4);
144
145		clk = devm_clk_get(dev, name);
146		if (IS_ERR(clk))
147			return PTR_ERR(clk);
148
149		ctu->info = &info->ctu_info[i];
150
151		ret = rsnd_mod_init(priv, rsnd_mod_get(ctu), &rsnd_ctu_ops,
152				    clk, RSND_MOD_CTU, i);
153		if (ret)
154			return ret;
155	}
156
157	return 0;
158}
159
160void rsnd_ctu_remove(struct platform_device *pdev,
161		     struct rsnd_priv *priv)
162{
163	struct rsnd_ctu *ctu;
164	int i;
165
166	for_each_rsnd_ctu(ctu, priv, i) {
167		rsnd_mod_quit(rsnd_mod_get(ctu));
168	}
169}
170