2 * Copyright (c) 2014 MediaTek Inc.
3 * Author: Flora Fu, MediaTek
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
15 #include <linux/interrupt.h>
16 #include <linux/module.h>
17 #include <linux/of_device.h>
18 #include <linux/of_irq.h>
19 #include <linux/regmap.h>
20 #include <linux/mfd/core.h>
21 #include <linux/mfd/mt6397/core.h>
22 #include <linux/mfd/mt6397/registers.h>
24 static const struct mfd_cell mt6397_devs
[] = {
27 .of_compatible
= "mediatek,mt6397-rtc",
29 .name
= "mt6397-regulator",
30 .of_compatible
= "mediatek,mt6397-regulator",
32 .name
= "mt6397-codec",
33 .of_compatible
= "mediatek,mt6397-codec",
36 .of_compatible
= "mediatek,mt6397-clk",
40 static void mt6397_irq_lock(struct irq_data
*data
)
42 struct mt6397_chip
*mt6397
= irq_get_chip_data(data
->irq
);
44 mutex_lock(&mt6397
->irqlock
);
47 static void mt6397_irq_sync_unlock(struct irq_data
*data
)
49 struct mt6397_chip
*mt6397
= irq_get_chip_data(data
->irq
);
51 regmap_write(mt6397
->regmap
, MT6397_INT_CON0
, mt6397
->irq_masks_cur
[0]);
52 regmap_write(mt6397
->regmap
, MT6397_INT_CON1
, mt6397
->irq_masks_cur
[1]);
54 mutex_unlock(&mt6397
->irqlock
);
57 static void mt6397_irq_disable(struct irq_data
*data
)
59 struct mt6397_chip
*mt6397
= irq_get_chip_data(data
->irq
);
60 int shift
= data
->hwirq
& 0xf;
61 int reg
= data
->hwirq
>> 4;
63 mt6397
->irq_masks_cur
[reg
] &= ~BIT(shift
);
66 static void mt6397_irq_enable(struct irq_data
*data
)
68 struct mt6397_chip
*mt6397
= irq_get_chip_data(data
->irq
);
69 int shift
= data
->hwirq
& 0xf;
70 int reg
= data
->hwirq
>> 4;
72 mt6397
->irq_masks_cur
[reg
] |= BIT(shift
);
75 static struct irq_chip mt6397_irq_chip
= {
77 .irq_bus_lock
= mt6397_irq_lock
,
78 .irq_bus_sync_unlock
= mt6397_irq_sync_unlock
,
79 .irq_enable
= mt6397_irq_enable
,
80 .irq_disable
= mt6397_irq_disable
,
83 static void mt6397_irq_handle_reg(struct mt6397_chip
*mt6397
, int reg
,
89 ret
= regmap_read(mt6397
->regmap
, reg
, &status
);
91 dev_err(mt6397
->dev
, "Failed to read irq status: %d\n", ret
);
95 for (i
= 0; i
< 16; i
++) {
96 if (status
& BIT(i
)) {
97 irq
= irq_find_mapping(mt6397
->irq_domain
, irqbase
+ i
);
99 handle_nested_irq(irq
);
103 regmap_write(mt6397
->regmap
, reg
, status
);
106 static irqreturn_t
mt6397_irq_thread(int irq
, void *data
)
108 struct mt6397_chip
*mt6397
= data
;
110 mt6397_irq_handle_reg(mt6397
, MT6397_INT_STATUS0
, 0);
111 mt6397_irq_handle_reg(mt6397
, MT6397_INT_STATUS1
, 16);
116 static int mt6397_irq_domain_map(struct irq_domain
*d
, unsigned int irq
,
119 struct mt6397_chip
*mt6397
= d
->host_data
;
121 irq_set_chip_data(irq
, mt6397
);
122 irq_set_chip_and_handler(irq
, &mt6397_irq_chip
, handle_level_irq
);
123 irq_set_nested_thread(irq
, 1);
125 set_irq_flags(irq
, IRQF_VALID
);
127 irq_set_noprobe(irq
);
133 static struct irq_domain_ops mt6397_irq_domain_ops
= {
134 .map
= mt6397_irq_domain_map
,
137 static int mt6397_irq_init(struct mt6397_chip
*mt6397
)
141 mutex_init(&mt6397
->irqlock
);
143 /* Mask all interrupt sources */
144 regmap_write(mt6397
->regmap
, MT6397_INT_CON0
, 0x0);
145 regmap_write(mt6397
->regmap
, MT6397_INT_CON1
, 0x0);
147 mt6397
->irq_domain
= irq_domain_add_linear(mt6397
->dev
->of_node
,
148 MT6397_IRQ_NR
, &mt6397_irq_domain_ops
, mt6397
);
149 if (!mt6397
->irq_domain
) {
150 dev_err(mt6397
->dev
, "could not create irq domain\n");
154 ret
= devm_request_threaded_irq(mt6397
->dev
, mt6397
->irq
, NULL
,
155 mt6397_irq_thread
, IRQF_ONESHOT
, "mt6397-pmic", mt6397
);
157 dev_err(mt6397
->dev
, "failed to register irq=%d; err: %d\n",
165 static int mt6397_probe(struct platform_device
*pdev
)
168 struct mt6397_chip
*mt6397
;
170 mt6397
= devm_kzalloc(&pdev
->dev
, sizeof(*mt6397
), GFP_KERNEL
);
174 mt6397
->dev
= &pdev
->dev
;
176 * mt6397 MFD is child device of soc pmic wrapper.
177 * Regmap is set from its parent.
179 mt6397
->regmap
= dev_get_regmap(pdev
->dev
.parent
, NULL
);
183 platform_set_drvdata(pdev
, mt6397
);
185 mt6397
->irq
= platform_get_irq(pdev
, 0);
186 if (mt6397
->irq
> 0) {
187 ret
= mt6397_irq_init(mt6397
);
192 ret
= mfd_add_devices(&pdev
->dev
, -1, mt6397_devs
,
193 ARRAY_SIZE(mt6397_devs
), NULL
, 0, NULL
);
195 dev_err(&pdev
->dev
, "failed to add child devices: %d\n", ret
);
200 static int mt6397_remove(struct platform_device
*pdev
)
202 mfd_remove_devices(&pdev
->dev
);
207 static const struct of_device_id mt6397_of_match
[] = {
208 { .compatible
= "mediatek,mt6397" },
211 MODULE_DEVICE_TABLE(of
, mt6397_of_match
);
213 static struct platform_driver mt6397_driver
= {
214 .probe
= mt6397_probe
,
215 .remove
= mt6397_remove
,
218 .of_match_table
= of_match_ptr(mt6397_of_match
),
222 module_platform_driver(mt6397_driver
);
224 MODULE_AUTHOR("Flora Fu, MediaTek");
225 MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
226 MODULE_LICENSE("GPL");
227 MODULE_ALIAS("platform:mt6397");