1 /*
2 * intel_bxtwc_tmu.c - Intel BXT Whiskey Cove PMIC TMU driver
3 *
4 * Copyright (C) 2016 Intel Corporation. All rights reserved.
5 *
6 * This driver adds TMU (Time Management Unit) support for Intel BXT platform.
7 * It enables the alarm wake-up functionality in the TMU unit of Whiskey Cove
8 * PMIC.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License version
12 * 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 */
20
21 #include <linux/module.h>
22 #include <linux/mod_devicetable.h>
23 #include <linux/interrupt.h>
24 #include <linux/platform_device.h>
25 #include <linux/mfd/intel_soc_pmic.h>
26
27 #define BXTWC_TMUIRQ 0x4fb6
28 #define BXTWC_MIRQLVL1 0x4e0e
29 #define BXTWC_MTMUIRQ_REG 0x4fb7
30 #define BXTWC_MIRQLVL1_MTMU BIT(1)
31 #define BXTWC_TMU_WK_ALRM BIT(1)
32 #define BXTWC_TMU_SYS_ALRM BIT(2)
33 #define BXTWC_TMU_ALRM_MASK (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
34 #define BXTWC_TMU_ALRM_IRQ (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
35
36 struct wcove_tmu {
37 int irq;
38 struct device *dev;
39 struct regmap *regmap;
40 };
41
bxt_wcove_tmu_irq_handler(int irq,void * data)42 static irqreturn_t bxt_wcove_tmu_irq_handler(int irq, void *data)
43 {
44 struct wcove_tmu *wctmu = data;
45 unsigned int tmu_irq;
46
47 /* Read TMU interrupt reg */
48 regmap_read(wctmu->regmap, BXTWC_TMUIRQ, &tmu_irq);
49 if (tmu_irq & BXTWC_TMU_ALRM_IRQ) {
50 /* clear TMU irq */
51 regmap_write(wctmu->regmap, BXTWC_TMUIRQ, tmu_irq);
52 return IRQ_HANDLED;
53 }
54 return IRQ_NONE;
55 }
56
bxt_wcove_tmu_probe(struct platform_device * pdev)57 static int bxt_wcove_tmu_probe(struct platform_device *pdev)
58 {
59 struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
60 struct regmap_irq_chip_data *regmap_irq_chip;
61 struct wcove_tmu *wctmu;
62 int ret, virq, irq;
63
64 wctmu = devm_kzalloc(&pdev->dev, sizeof(*wctmu), GFP_KERNEL);
65 if (!wctmu)
66 return -ENOMEM;
67
68 wctmu->dev = &pdev->dev;
69 wctmu->regmap = pmic->regmap;
70
71 irq = platform_get_irq(pdev, 0);
72
73 if (irq < 0) {
74 dev_err(&pdev->dev, "invalid irq %d\n", irq);
75 return irq;
76 }
77
78 regmap_irq_chip = pmic->irq_chip_data_tmu;
79 virq = regmap_irq_get_virq(regmap_irq_chip, irq);
80 if (virq < 0) {
81 dev_err(&pdev->dev,
82 "failed to get virtual interrupt=%d\n", irq);
83 return virq;
84 }
85
86 ret = devm_request_threaded_irq(&pdev->dev, virq,
87 NULL, bxt_wcove_tmu_irq_handler,
88 IRQF_ONESHOT, "bxt_wcove_tmu", wctmu);
89 if (ret) {
90 dev_err(&pdev->dev, "request irq failed: %d,virq: %d\n",
91 ret, virq);
92 return ret;
93 }
94 wctmu->irq = virq;
95
96 /* Unmask TMU second level Wake & System alarm */
97 regmap_update_bits(wctmu->regmap, BXTWC_MTMUIRQ_REG,
98 BXTWC_TMU_ALRM_MASK, 0);
99
100 platform_set_drvdata(pdev, wctmu);
101 return 0;
102 }
103
bxt_wcove_tmu_remove(struct platform_device * pdev)104 static int bxt_wcove_tmu_remove(struct platform_device *pdev)
105 {
106 struct wcove_tmu *wctmu = platform_get_drvdata(pdev);
107 unsigned int val;
108
109 /* Mask TMU interrupts */
110 regmap_read(wctmu->regmap, BXTWC_MIRQLVL1, &val);
111 regmap_write(wctmu->regmap, BXTWC_MIRQLVL1,
112 val | BXTWC_MIRQLVL1_MTMU);
113 regmap_read(wctmu->regmap, BXTWC_MTMUIRQ_REG, &val);
114 regmap_write(wctmu->regmap, BXTWC_MTMUIRQ_REG,
115 val | BXTWC_TMU_ALRM_MASK);
116 return 0;
117 }
118
119 #ifdef CONFIG_PM_SLEEP
bxtwc_tmu_suspend(struct device * dev)120 static int bxtwc_tmu_suspend(struct device *dev)
121 {
122 struct wcove_tmu *wctmu = dev_get_drvdata(dev);
123
124 enable_irq_wake(wctmu->irq);
125 return 0;
126 }
127
bxtwc_tmu_resume(struct device * dev)128 static int bxtwc_tmu_resume(struct device *dev)
129 {
130 struct wcove_tmu *wctmu = dev_get_drvdata(dev);
131
132 disable_irq_wake(wctmu->irq);
133 return 0;
134 }
135 #endif
136
137 static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume);
138
139 static const struct platform_device_id bxt_wcove_tmu_id_table[] = {
140 { .name = "bxt_wcove_tmu" },
141 {},
142 };
143 MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table);
144
145 static struct platform_driver bxt_wcove_tmu_driver = {
146 .probe = bxt_wcove_tmu_probe,
147 .remove = bxt_wcove_tmu_remove,
148 .driver = {
149 .name = "bxt_wcove_tmu",
150 .pm = &bxtwc_tmu_pm_ops,
151 },
152 .id_table = bxt_wcove_tmu_id_table,
153 };
154
155 module_platform_driver(bxt_wcove_tmu_driver);
156
157 MODULE_LICENSE("GPL v2");
158 MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>");
159 MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver");
160
