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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
27struct wcove_tmu {
28 int irq;
29 struct device *dev;
30 struct regmap *regmap;
31};
32
33static 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
48static int bxt_wcove_tmu_probe(struct platform_device *pdev)
49{
50 struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
51 struct regmap_irq_chip_data *regmap_irq_chip;
52 struct wcove_tmu *wctmu;
53 int ret, virq, irq;
54
55 wctmu = devm_kzalloc(&pdev->dev, sizeof(*wctmu), GFP_KERNEL);
56 if (!wctmu)
57 return -ENOMEM;
58
59 wctmu->dev = &pdev->dev;
60 wctmu->regmap = pmic->regmap;
61
62 irq = platform_get_irq(pdev, 0);
63 if (irq < 0)
64 return irq;
65
66 regmap_irq_chip = pmic->irq_chip_data_tmu;
67 virq = regmap_irq_get_virq(regmap_irq_chip, irq);
68 if (virq < 0) {
69 dev_err(&pdev->dev,
70 "failed to get virtual interrupt=%d\n", irq);
71 return virq;
72 }
73
74 ret = devm_request_threaded_irq(&pdev->dev, virq,
75 NULL, bxt_wcove_tmu_irq_handler,
76 IRQF_ONESHOT, "bxt_wcove_tmu", wctmu);
77 if (ret) {
78 dev_err(&pdev->dev, "request irq failed: %d,virq: %d\n",
79 ret, virq);
80 return ret;
81 }
82 wctmu->irq = virq;
83
84 /* Unmask TMU second level Wake & System alarm */
85 regmap_update_bits(wctmu->regmap, BXTWC_MTMUIRQ_REG,
86 BXTWC_TMU_ALRM_MASK, 0);
87
88 platform_set_drvdata(pdev, wctmu);
89 return 0;
90}
91
92static int bxt_wcove_tmu_remove(struct platform_device *pdev)
93{
94 struct wcove_tmu *wctmu = platform_get_drvdata(pdev);
95 unsigned int val;
96
97 /* Mask TMU interrupts */
98 regmap_read(wctmu->regmap, BXTWC_MIRQLVL1, &val);
99 regmap_write(wctmu->regmap, BXTWC_MIRQLVL1,
100 val | BXTWC_MIRQLVL1_MTMU);
101 regmap_read(wctmu->regmap, BXTWC_MTMUIRQ_REG, &val);
102 regmap_write(wctmu->regmap, BXTWC_MTMUIRQ_REG,
103 val | BXTWC_TMU_ALRM_MASK);
104 return 0;
105}
106
107#ifdef CONFIG_PM_SLEEP
108static int bxtwc_tmu_suspend(struct device *dev)
109{
110 struct wcove_tmu *wctmu = dev_get_drvdata(dev);
111
112 enable_irq_wake(wctmu->irq);
113 return 0;
114}
115
116static int bxtwc_tmu_resume(struct device *dev)
117{
118 struct wcove_tmu *wctmu = dev_get_drvdata(dev);
119
120 disable_irq_wake(wctmu->irq);
121 return 0;
122}
123#endif
124
125static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume);
126
127static const struct platform_device_id bxt_wcove_tmu_id_table[] = {
128 { .name = "bxt_wcove_tmu" },
129 {},
130};
131MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table);
132
133static struct platform_driver bxt_wcove_tmu_driver = {
134 .probe = bxt_wcove_tmu_probe,
135 .remove = bxt_wcove_tmu_remove,
136 .driver = {
137 .name = "bxt_wcove_tmu",
138 .pm = &bxtwc_tmu_pm_ops,
139 },
140 .id_table = bxt_wcove_tmu_id_table,
141};
142
143module_platform_driver(bxt_wcove_tmu_driver);
144
145MODULE_LICENSE("GPL v2");
146MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>");
147MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver");
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
27struct wcove_tmu {
28 int irq;
29 struct device *dev;
30 struct regmap *regmap;
31};
32
33static 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
48static 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
82static 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
97static 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
105static 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
114static SIMPLE_DEV_PM_OPS(bxtwc_tmu_pm_ops, bxtwc_tmu_suspend, bxtwc_tmu_resume);
115
116static const struct platform_device_id bxt_wcove_tmu_id_table[] = {
117 { .name = "bxt_wcove_tmu" },
118 {},
119};
120MODULE_DEVICE_TABLE(platform, bxt_wcove_tmu_id_table);
121
122static 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
132module_platform_driver(bxt_wcove_tmu_driver);
133
134MODULE_LICENSE("GPL v2");
135MODULE_AUTHOR("Nilesh Bacchewar <nilesh.bacchewar@intel.com>");
136MODULE_DESCRIPTION("BXT Whiskey Cove TMU Driver");