blob: 03929a6c6fc494bf04c71a3140d7d88630769495 [file] [log] [blame]
Flora Fu6df8dd52015-02-22 13:15:29 +01001/*
2 * Copyright (c) 2014 MediaTek Inc.
3 * Author: Flora Fu, MediaTek
4 *
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.
8 *
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.
13 */
14
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>
23
Eddie Huanga5d7ea02015-05-06 15:23:40 +080024#define MT6397_RTC_BASE 0xe000
25#define MT6397_RTC_SIZE 0x3e
26
27static const struct resource mt6397_rtc_resources[] = {
28 {
29 .start = MT6397_RTC_BASE,
30 .end = MT6397_RTC_BASE + MT6397_RTC_SIZE,
31 .flags = IORESOURCE_MEM,
32 },
33 {
34 .start = MT6397_IRQ_RTC,
35 .end = MT6397_IRQ_RTC,
36 .flags = IORESOURCE_IRQ,
37 },
38};
39
Flora Fu6df8dd52015-02-22 13:15:29 +010040static const struct mfd_cell mt6397_devs[] = {
41 {
42 .name = "mt6397-rtc",
Eddie Huanga5d7ea02015-05-06 15:23:40 +080043 .num_resources = ARRAY_SIZE(mt6397_rtc_resources),
44 .resources = mt6397_rtc_resources,
Flora Fu6df8dd52015-02-22 13:15:29 +010045 .of_compatible = "mediatek,mt6397-rtc",
46 }, {
47 .name = "mt6397-regulator",
48 .of_compatible = "mediatek,mt6397-regulator",
49 }, {
50 .name = "mt6397-codec",
51 .of_compatible = "mediatek,mt6397-codec",
52 }, {
53 .name = "mt6397-clk",
54 .of_compatible = "mediatek,mt6397-clk",
Hongzhou Yangcf550782015-05-27 02:10:35 -070055 }, {
56 .name = "mt6397-pinctrl",
57 .of_compatible = "mediatek,mt6397-pinctrl",
Flora Fu6df8dd52015-02-22 13:15:29 +010058 },
59};
60
61static void mt6397_irq_lock(struct irq_data *data)
62{
63 struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
64
65 mutex_lock(&mt6397->irqlock);
66}
67
68static void mt6397_irq_sync_unlock(struct irq_data *data)
69{
70 struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
71
72 regmap_write(mt6397->regmap, MT6397_INT_CON0, mt6397->irq_masks_cur[0]);
73 regmap_write(mt6397->regmap, MT6397_INT_CON1, mt6397->irq_masks_cur[1]);
74
75 mutex_unlock(&mt6397->irqlock);
76}
77
78static void mt6397_irq_disable(struct irq_data *data)
79{
80 struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
81 int shift = data->hwirq & 0xf;
82 int reg = data->hwirq >> 4;
83
84 mt6397->irq_masks_cur[reg] &= ~BIT(shift);
85}
86
87static void mt6397_irq_enable(struct irq_data *data)
88{
89 struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq);
90 int shift = data->hwirq & 0xf;
91 int reg = data->hwirq >> 4;
92
93 mt6397->irq_masks_cur[reg] |= BIT(shift);
94}
95
96static struct irq_chip mt6397_irq_chip = {
97 .name = "mt6397-irq",
98 .irq_bus_lock = mt6397_irq_lock,
99 .irq_bus_sync_unlock = mt6397_irq_sync_unlock,
100 .irq_enable = mt6397_irq_enable,
101 .irq_disable = mt6397_irq_disable,
102};
103
104static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
105 int irqbase)
106{
107 unsigned int status;
108 int i, irq, ret;
109
110 ret = regmap_read(mt6397->regmap, reg, &status);
111 if (ret) {
112 dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
113 return;
114 }
115
116 for (i = 0; i < 16; i++) {
117 if (status & BIT(i)) {
118 irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
119 if (irq)
120 handle_nested_irq(irq);
121 }
122 }
123
124 regmap_write(mt6397->regmap, reg, status);
125}
126
127static irqreturn_t mt6397_irq_thread(int irq, void *data)
128{
129 struct mt6397_chip *mt6397 = data;
130
131 mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS0, 0);
132 mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS1, 16);
133
134 return IRQ_HANDLED;
135}
136
137static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
138 irq_hw_number_t hw)
139{
140 struct mt6397_chip *mt6397 = d->host_data;
141
142 irq_set_chip_data(irq, mt6397);
143 irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
144 irq_set_nested_thread(irq, 1);
145#ifdef CONFIG_ARM
146 set_irq_flags(irq, IRQF_VALID);
147#else
148 irq_set_noprobe(irq);
149#endif
150
151 return 0;
152}
153
Krzysztof Kozlowski7ce7b262015-04-27 21:54:13 +0900154static const struct irq_domain_ops mt6397_irq_domain_ops = {
Flora Fu6df8dd52015-02-22 13:15:29 +0100155 .map = mt6397_irq_domain_map,
156};
157
158static int mt6397_irq_init(struct mt6397_chip *mt6397)
159{
160 int ret;
161
162 mutex_init(&mt6397->irqlock);
163
164 /* Mask all interrupt sources */
165 regmap_write(mt6397->regmap, MT6397_INT_CON0, 0x0);
166 regmap_write(mt6397->regmap, MT6397_INT_CON1, 0x0);
167
168 mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node,
169 MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397);
170 if (!mt6397->irq_domain) {
171 dev_err(mt6397->dev, "could not create irq domain\n");
172 return -ENOMEM;
173 }
174
175 ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL,
176 mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397);
177 if (ret) {
178 dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n",
179 mt6397->irq, ret);
180 return ret;
181 }
182
183 return 0;
184}
185
186static int mt6397_probe(struct platform_device *pdev)
187{
188 int ret;
189 struct mt6397_chip *mt6397;
190
191 mt6397 = devm_kzalloc(&pdev->dev, sizeof(*mt6397), GFP_KERNEL);
192 if (!mt6397)
193 return -ENOMEM;
194
195 mt6397->dev = &pdev->dev;
196 /*
197 * mt6397 MFD is child device of soc pmic wrapper.
198 * Regmap is set from its parent.
199 */
200 mt6397->regmap = dev_get_regmap(pdev->dev.parent, NULL);
201 if (!mt6397->regmap)
202 return -ENODEV;
203
204 platform_set_drvdata(pdev, mt6397);
205
206 mt6397->irq = platform_get_irq(pdev, 0);
207 if (mt6397->irq > 0) {
208 ret = mt6397_irq_init(mt6397);
209 if (ret)
210 return ret;
211 }
212
213 ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
214 ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
215 if (ret)
216 dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
217
218 return ret;
219}
220
221static int mt6397_remove(struct platform_device *pdev)
222{
223 mfd_remove_devices(&pdev->dev);
224
225 return 0;
226}
227
228static const struct of_device_id mt6397_of_match[] = {
229 { .compatible = "mediatek,mt6397" },
230 { }
231};
232MODULE_DEVICE_TABLE(of, mt6397_of_match);
233
234static struct platform_driver mt6397_driver = {
235 .probe = mt6397_probe,
236 .remove = mt6397_remove,
237 .driver = {
238 .name = "mt6397",
239 .of_match_table = of_match_ptr(mt6397_of_match),
240 },
241};
242
243module_platform_driver(mt6397_driver);
244
245MODULE_AUTHOR("Flora Fu, MediaTek");
246MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC");
247MODULE_LICENSE("GPL");
248MODULE_ALIAS("platform:mt6397");