summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/cs42l43-sdw.c
blob: 65f7b1d7824861041899c0f6bddda4776edc8cf0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
// SPDX-License-Identifier: GPL-2.0
/*
 * CS42L43 SoundWire driver
 *
 * Copyright (C) 2022-2023 Cirrus Logic, Inc. and
 *                         Cirrus Logic International Semiconductor Ltd.
 */

#include <linux/array_size.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/mfd/cs42l43.h>
#include <linux/mfd/cs42l43-regs.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw_type.h>

#include "cs42l43.h"

#define CS42L43_SDW_PORT(port, chans) { \
	.num = port, \
	.max_ch = chans, \
	.type = SDW_DPN_FULL, \
	.max_word = 24, \
}

static const struct regmap_config cs42l43_sdw_regmap = {
	.reg_bits		= 32,
	.reg_stride		= 4,
	.val_bits		= 32,
	.reg_format_endian	= REGMAP_ENDIAN_LITTLE,
	.val_format_endian	= REGMAP_ENDIAN_LITTLE,

	.max_register		= CS42L43_MCU_RAM_MAX,
	.readable_reg		= cs42l43_readable_register,
	.volatile_reg		= cs42l43_volatile_register,
	.precious_reg		= cs42l43_precious_register,

	.cache_type		= REGCACHE_MAPLE,
	.reg_defaults		= cs42l43_reg_default,
	.num_reg_defaults	= ARRAY_SIZE(cs42l43_reg_default),
};

static const struct sdw_dpn_prop cs42l43_src_port_props[] = {
	CS42L43_SDW_PORT(1, 4),
	CS42L43_SDW_PORT(2, 2),
	CS42L43_SDW_PORT(3, 2),
	CS42L43_SDW_PORT(4, 2),
};

static const struct sdw_dpn_prop cs42l43_sink_port_props[] = {
	CS42L43_SDW_PORT(5, 2),
	CS42L43_SDW_PORT(6, 2),
	CS42L43_SDW_PORT(7, 2),
};

static int cs42l43_read_prop(struct sdw_slave *sdw)
{
	struct sdw_slave_prop *prop = &sdw->prop;
	struct device *dev = &sdw->dev;
	int i;

	prop->use_domain_irq = true;
	prop->paging_support = true;
	prop->wake_capable = true;
	prop->quirks = SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY;
	prop->scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY |
			      SDW_SCP_INT1_IMPL_DEF;

	for (i = 0; i < ARRAY_SIZE(cs42l43_src_port_props); i++)
		prop->source_ports |= BIT(cs42l43_src_port_props[i].num);

	prop->src_dpn_prop = devm_kmemdup(dev, cs42l43_src_port_props,
					  sizeof(cs42l43_src_port_props), GFP_KERNEL);
	if (!prop->src_dpn_prop)
		return -ENOMEM;

	for (i = 0; i < ARRAY_SIZE(cs42l43_sink_port_props); i++)
		prop->sink_ports |= BIT(cs42l43_sink_port_props[i].num);

	prop->sink_dpn_prop = devm_kmemdup(dev, cs42l43_sink_port_props,
					   sizeof(cs42l43_sink_port_props), GFP_KERNEL);
	if (!prop->sink_dpn_prop)
		return -ENOMEM;

	return 0;
}

static int cs42l43_sdw_update_status(struct sdw_slave *sdw, enum sdw_slave_status status)
{
	struct cs42l43 *cs42l43 = dev_get_drvdata(&sdw->dev);

	switch (status) {
	case SDW_SLAVE_ATTACHED:
		dev_dbg(cs42l43->dev, "Device attach\n");

		sdw_write_no_pm(sdw, CS42L43_GEN_INT_MASK_1,
				CS42L43_INT_STAT_GEN1_MASK);

		cs42l43->attached = true;

		complete(&cs42l43->device_attach);
		break;
	case SDW_SLAVE_UNATTACHED:
		dev_dbg(cs42l43->dev, "Device detach\n");

		cs42l43->attached = false;

		reinit_completion(&cs42l43->device_attach);
		complete(&cs42l43->device_detach);
		break;
	default:
		break;
	}

	return 0;
}

static int cs42l43_sdw_interrupt(struct sdw_slave *sdw,
				 struct sdw_slave_intr_status *status)
{
	/*
	 * The IRQ itself was handled through the regmap_irq handler, this is
	 * just clearing up the additional Cirrus SoundWire registers that are
	 * not covered by the SoundWire framework or the IRQ handler itself.
	 * There is only a single bit in GEN_INT_STAT_1 and it doesn't clear if
	 * IRQs are still pending so doing a read/write here after handling the
	 * IRQ is fine.
	 */
	sdw_read_no_pm(sdw, CS42L43_GEN_INT_STAT_1);
	sdw_write_no_pm(sdw, CS42L43_GEN_INT_STAT_1, CS42L43_INT_STAT_GEN1_MASK);

	return 0;
}

static int cs42l43_sdw_bus_config(struct sdw_slave *sdw,
				  struct sdw_bus_params *params)
{
	struct cs42l43 *cs42l43 = dev_get_drvdata(&sdw->dev);
	int ret = 0;

	mutex_lock(&cs42l43->pll_lock);

	if (cs42l43->sdw_freq != params->curr_dr_freq / 2) {
		if (cs42l43->sdw_pll_active) {
			dev_err(cs42l43->dev,
				"PLL active can't change SoundWire bus clock\n");
			ret = -EBUSY;
		} else {
			cs42l43->sdw_freq = params->curr_dr_freq / 2;
		}
	}

	mutex_unlock(&cs42l43->pll_lock);

	return ret;
}

static const struct sdw_slave_ops cs42l43_sdw_ops = {
	.read_prop		= cs42l43_read_prop,
	.update_status		= cs42l43_sdw_update_status,
	.interrupt_callback	= cs42l43_sdw_interrupt,
	.bus_config		= cs42l43_sdw_bus_config,
};

static int cs42l43_sdw_probe(struct sdw_slave *sdw, const struct sdw_device_id *id)
{
	struct cs42l43 *cs42l43;
	struct device *dev = &sdw->dev;

	cs42l43 = devm_kzalloc(dev, sizeof(*cs42l43), GFP_KERNEL);
	if (!cs42l43)
		return -ENOMEM;

	cs42l43->dev = dev;
	cs42l43->sdw = sdw;

	cs42l43->regmap = devm_regmap_init_sdw(sdw, &cs42l43_sdw_regmap);
	if (IS_ERR(cs42l43->regmap))
		return dev_err_probe(cs42l43->dev, PTR_ERR(cs42l43->regmap),
				     "Failed to allocate regmap\n");

	return cs42l43_dev_probe(cs42l43);
}

static int cs42l43_sdw_remove(struct sdw_slave *sdw)
{
	struct cs42l43 *cs42l43 = dev_get_drvdata(&sdw->dev);

	cs42l43_dev_remove(cs42l43);

	return 0;
}

static const struct sdw_device_id cs42l43_sdw_id[] = {
	SDW_SLAVE_ENTRY(0x01FA, 0x4243, 0),
	{}
};
MODULE_DEVICE_TABLE(sdw, cs42l43_sdw_id);

static struct sdw_driver cs42l43_sdw_driver = {
	.driver = {
		.name		= "cs42l43",
		.pm		= pm_ptr(&cs42l43_pm_ops),
	},

	.probe		= cs42l43_sdw_probe,
	.remove		= cs42l43_sdw_remove,
	.id_table	= cs42l43_sdw_id,
	.ops		= &cs42l43_sdw_ops,
};
module_sdw_driver(cs42l43_sdw_driver);

MODULE_IMPORT_NS(MFD_CS42L43);

MODULE_DESCRIPTION("CS42L43 SoundWire Driver");
MODULE_AUTHOR("Lucas Tanure <tanureal@opensource.cirrus.com>");
MODULE_LICENSE("GPL");