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1/*
2 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved
3 *
4 * Author: Lee Jones <lee.jones@linaro.org>
5 *
6 * This is a re-write of Christophe Kerello's PMU driver.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <dt-bindings/interrupt-controller/irq-st.h>
14#include <linux/err.h>
15#include <linux/mfd/syscon.h>
16#include <linux/of_device.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/slab.h>
20
21#define STIH415_SYSCFG_642 0x0a8
22#define STIH416_SYSCFG_7543 0x87c
23#define STIH407_SYSCFG_5102 0x198
24#define STID127_SYSCFG_734 0x088
25
26#define ST_A9_IRQ_MASK 0x001FFFFF
27#define ST_A9_IRQ_MAX_CHANS 2
28
29#define ST_A9_IRQ_EN_CTI_0 BIT(0)
30#define ST_A9_IRQ_EN_CTI_1 BIT(1)
31#define ST_A9_IRQ_EN_PMU_0 BIT(2)
32#define ST_A9_IRQ_EN_PMU_1 BIT(3)
33#define ST_A9_IRQ_EN_PL310_L2 BIT(4)
34#define ST_A9_IRQ_EN_EXT_0 BIT(5)
35#define ST_A9_IRQ_EN_EXT_1 BIT(6)
36#define ST_A9_IRQ_EN_EXT_2 BIT(7)
37
38#define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3)))
39#define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3)))
40#define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20)
41
42struct st_irq_syscfg {
43 struct regmap *regmap;
44 unsigned int syscfg;
45 unsigned int config;
46 bool ext_inverted;
47};
48
49static const struct of_device_id st_irq_syscfg_match[] = {
50 {
51 .compatible = "st,stih415-irq-syscfg",
52 .data = (void *)STIH415_SYSCFG_642,
53 },
54 {
55 .compatible = "st,stih416-irq-syscfg",
56 .data = (void *)STIH416_SYSCFG_7543,
57 },
58 {
59 .compatible = "st,stih407-irq-syscfg",
60 .data = (void *)STIH407_SYSCFG_5102,
61 },
62 {
63 .compatible = "st,stid127-irq-syscfg",
64 .data = (void *)STID127_SYSCFG_734,
65 },
66 {}
67};
68
69static int st_irq_xlate(struct platform_device *pdev,
70 int device, int channel, bool irq)
71{
72 struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
73
74 /* Set the device enable bit. */
75 switch (device) {
76 case ST_IRQ_SYSCFG_EXT_0:
77 ddata->config |= ST_A9_IRQ_EN_EXT_0;
78 break;
79 case ST_IRQ_SYSCFG_EXT_1:
80 ddata->config |= ST_A9_IRQ_EN_EXT_1;
81 break;
82 case ST_IRQ_SYSCFG_EXT_2:
83 ddata->config |= ST_A9_IRQ_EN_EXT_2;
84 break;
85 case ST_IRQ_SYSCFG_CTI_0:
86 ddata->config |= ST_A9_IRQ_EN_CTI_0;
87 break;
88 case ST_IRQ_SYSCFG_CTI_1:
89 ddata->config |= ST_A9_IRQ_EN_CTI_1;
90 break;
91 case ST_IRQ_SYSCFG_PMU_0:
92 ddata->config |= ST_A9_IRQ_EN_PMU_0;
93 break;
94 case ST_IRQ_SYSCFG_PMU_1:
95 ddata->config |= ST_A9_IRQ_EN_PMU_1;
96 break;
97 case ST_IRQ_SYSCFG_pl310_L2:
98 ddata->config |= ST_A9_IRQ_EN_PL310_L2;
99 break;
100 case ST_IRQ_SYSCFG_DISABLED:
101 return 0;
102 default:
103 dev_err(&pdev->dev, "Unrecognised device %d\n", device);
104 return -EINVAL;
105 }
106
107 /* Select IRQ/FIQ channel for device. */
108 ddata->config |= irq ?
109 ST_A9_IRQ_N_SEL(device, channel) :
110 ST_A9_FIQ_N_SEL(device, channel);
111
112 return 0;
113}
114
115static int st_irq_syscfg_enable(struct platform_device *pdev)
116{
117 struct device_node *np = pdev->dev.of_node;
118 struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
119 int channels, ret, i;
120 u32 device, invert;
121
122 channels = of_property_count_u32_elems(np, "st,irq-device");
123 if (channels != ST_A9_IRQ_MAX_CHANS) {
124 dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
125 return -EINVAL;
126 }
127
128 channels = of_property_count_u32_elems(np, "st,fiq-device");
129 if (channels != ST_A9_IRQ_MAX_CHANS) {
130 dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
131 return -EINVAL;
132 }
133
134 for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
135 of_property_read_u32_index(np, "st,irq-device", i, &device);
136
137 ret = st_irq_xlate(pdev, device, i, true);
138 if (ret)
139 return ret;
140
141 of_property_read_u32_index(np, "st,fiq-device", i, &device);
142
143 ret = st_irq_xlate(pdev, device, i, false);
144 if (ret)
145 return ret;
146 }
147
148 /* External IRQs may be inverted. */
149 of_property_read_u32(np, "st,invert-ext", &invert);
150 ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);
151
152 return regmap_update_bits(ddata->regmap, ddata->syscfg,
153 ST_A9_IRQ_MASK, ddata->config);
154}
155
156static int st_irq_syscfg_probe(struct platform_device *pdev)
157{
158 struct device_node *np = pdev->dev.of_node;
159 const struct of_device_id *match;
160 struct st_irq_syscfg *ddata;
161
162 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
163 if (!ddata)
164 return -ENOMEM;
165
166 match = of_match_device(st_irq_syscfg_match, &pdev->dev);
167 if (!match)
168 return -ENODEV;
169
170 ddata->syscfg = (unsigned int)match->data;
171
172 ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
173 if (IS_ERR(ddata->regmap)) {
174 dev_err(&pdev->dev, "syscfg phandle missing\n");
175 return PTR_ERR(ddata->regmap);
176 }
177
178 dev_set_drvdata(&pdev->dev, ddata);
179
180 return st_irq_syscfg_enable(pdev);
181}
182
183static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
184{
185 struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
186
187 return regmap_update_bits(ddata->regmap, ddata->syscfg,
188 ST_A9_IRQ_MASK, ddata->config);
189}
190
191static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
192
193static struct platform_driver st_irq_syscfg_driver = {
194 .driver = {
195 .name = "st_irq_syscfg",
196 .pm = &st_irq_syscfg_pm_ops,
197 .of_match_table = st_irq_syscfg_match,
198 },
199 .probe = st_irq_syscfg_probe,
200};
201
202static int __init st_irq_syscfg_init(void)
203{
204 return platform_driver_register(&st_irq_syscfg_driver);
205}
206core_initcall(st_irq_syscfg_init);
207

Warning: That file was not part of the compilation database. It may have many parsing errors.