1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Intel BXT Whiskey Cove PMIC TMU driver
4 *
5 * Copyright (C) 2016 Intel Corporation. All rights reserved.
6 *
7 * This driver adds TMU (Time Management Unit) support for Intel BXT platform.
8 * It enables the alarm wake-up functionality in the TMU unit of Whiskey Cove
9 * PMIC.
10 */
11
12 #include <linux/module.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/mfd/intel_soc_pmic.h>
17
18 #define BXTWC_TMUIRQ 0x4fb6
19 #define BXTWC_MIRQLVL1 0x4e0e
20 #define BXTWC_MTMUIRQ_REG 0x4fb7
21 #define BXTWC_MIRQLVL1_MTMU BIT(1)
22 #define BXTWC_TMU_WK_ALRM BIT(1)
23 #define BXTWC_TMU_SYS_ALRM BIT(2)
24 #define BXTWC_TMU_ALRM_MASK (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
25 #define BXTWC_TMU_ALRM_IRQ (BXTWC_TMU_WK_ALRM | BXTWC_TMU_SYS_ALRM)
26
27 struct wcove_tmu {
28 int irq;
29 struct device *dev;
30 struct regmap *regmap;
31 };
32
bxt_wcove_tmu_irq_handler(int irq,void * data)33 static irqreturn_t bxt_wcove_tmu_irq_handler(int irq, void *data)
34 {
35 struct wcove_tmu *wctmu = data;
36 unsigned int tmu_irq;
37
38 /* Read TMU interrupt reg */
39 regmap_read(wctmu->regmap, BXTWC_TMUIRQ, &tmu_irq);
40 if (tmu_irq & BXTWC_TMU_ALRM_IRQ) {
41 /* clear TMU irq */
42 regmap_write(wctmu->regmap, BXTWC_TMUIRQ, tmu_irq);
43 return IRQ_HANDLED;
44 }
45 return IRQ_NONE;
46 }
47
bxt_wcove_tmu_probe(struct platform_device * pdev)48 static int bxt_wcove_tmu_probe(struct platform_device *pdev)
49 {
50 struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
51 struct wcove_tmu *wctmu;
52 int ret;
53
54 wctmu = devm_kzalloc(&pdev->dev, sizeof(*wctmu), GFP_KERNEL);
55 if (!wctmu)
56 return -ENOMEM;
57
58 wctmu->dev = &pdev->dev;
59 wctmu->regmap = pmic->regmap;
60
61 wctmu->irq = platform_get_irq(pdev, 0);
62 if (wctmu->irq < 0)
63 return wctmu->irq;
64
65 ret = devm_request_threaded_irq(&pdev->dev, wctmu->irq,
66 NULL, bxt_wcove_tmu_irq_handler,
67 IRQF_ONESHOT, "bxt_wcove_tmu", wctmu);
68 if (ret) {
69 dev_err(&pdev->dev, "request irq failed: %d,virq: %d\n",
70 ret, wctmu->irq);
71 return ret;
72 }
73
74 /* Unmask TMU second level Wake & System alarm */
75 regmap_update_bits(wctmu->regmap, BXTWC_MTMUIRQ_REG,
76 BXTWC_TMU_ALRM_MASK, 0);
77
78 platform_set_drvdata(pdev, wctmu);
79 return 0;
80 }
81
bxt_wcove_tmu_remove(struct platform_device * pdev)82 static void bxt_wcove_tmu_remove(struct platform_device *pdev)
83 {
84 struct wcove_tmu *wctmu = platform_get_drvdata(pdev);
85 unsigned int val;
86
87 /* Mask TMU interrupts */
88 regmap_read(wctmu->regmap, BXTWC_MIRQLVL1, &val);
89 regmap_write(wctmu->regmap, BXTWC_MIRQLVL1,
90 val | BXTWC_MIRQLVL1_MTMU);
91 regmap_read(wctmu->regmap, BXTWC_MTMUIRQ_REG, &val);
92 regmap_write(wctmu->regmap, BXTWC_MTMUIRQ_REG,
93 val | BXTWC_TMU_ALRM_MASK);
94 }
95
96 #ifdef CONFIG_PM_SLEEP
bxtwc_tmu_suspend(struct device * dev)97 static int bxtwc_tmu_suspend(struct device *dev)
98 {
99 struct wcove_tmu *wctmu = dev_get_drvdata(dev);
100
101 enable_irq_wake(wctmu->irq);
102 return 0;
103 }
104
bxtwc_tmu_resume(struct device * dev)105 static int bxtwc_tmu_resume(struct device *dev)
106 {
107 struct wcove_tmu *wctmu = dev_get_drvdata(dev);
108
109 disable_irq_wake(wctmu->irq);
110 return 0;
111 }
112 #endif
113
114 static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume);
115
116 static const struct platform_device_id bxt_wcove_tmu_id_table[] = {
117 { .name = "bxt_wcove_tmu" },
118 {},
119 };
120 MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table);
121
122 static struct platform_driver bxt_wcove_tmu_driver = {
123 .probe = bxt_wcove_tmu_probe,
124 .remove = bxt_wcove_tmu_remove,
125 .driver = {
126 .name = "bxt_wcove_tmu",
127 .pm = &bxtwc_tmu_pm_ops,
128 },
129 .id_table = bxt_wcove_tmu_id_table,
130 };
131
132 module_platform_driver(bxt_wcove_tmu_driver);
133
134 MODULE_LICENSE("GPL v2");
135 MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>");
136 MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver");
137