Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6-microblaze.git] / drivers / irqchip / irq-st.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Copyright (C) 2014 STMicroelectronics – All Rights Reserved
4  *
5  *  Author: Lee Jones <lee.jones@linaro.org>
6  *
7  *  This is a re-write of Christophe Kerello's PMU driver.
8  */
9
10 #include <dt-bindings/interrupt-controller/irq-st.h>
11 #include <linux/err.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/of_device.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/slab.h>
17
18 #define STIH415_SYSCFG_642              0x0a8
19 #define STIH416_SYSCFG_7543             0x87c
20 #define STIH407_SYSCFG_5102             0x198
21 #define STID127_SYSCFG_734              0x088
22
23 #define ST_A9_IRQ_MASK                  0x001FFFFF
24 #define ST_A9_IRQ_MAX_CHANS             2
25
26 #define ST_A9_IRQ_EN_CTI_0              BIT(0)
27 #define ST_A9_IRQ_EN_CTI_1              BIT(1)
28 #define ST_A9_IRQ_EN_PMU_0              BIT(2)
29 #define ST_A9_IRQ_EN_PMU_1              BIT(3)
30 #define ST_A9_IRQ_EN_PL310_L2           BIT(4)
31 #define ST_A9_IRQ_EN_EXT_0              BIT(5)
32 #define ST_A9_IRQ_EN_EXT_1              BIT(6)
33 #define ST_A9_IRQ_EN_EXT_2              BIT(7)
34
35 #define ST_A9_FIQ_N_SEL(dev, chan)      (dev << (8  + (chan * 3)))
36 #define ST_A9_IRQ_N_SEL(dev, chan)      (dev << (14 + (chan * 3)))
37 #define ST_A9_EXTIRQ_INV_SEL(dev)       (dev << 20)
38
39 struct st_irq_syscfg {
40         struct regmap *regmap;
41         unsigned int syscfg;
42         unsigned int config;
43         bool ext_inverted;
44 };
45
46 static const struct of_device_id st_irq_syscfg_match[] = {
47         {
48                 .compatible = "st,stih415-irq-syscfg",
49                 .data = (void *)STIH415_SYSCFG_642,
50         },
51         {
52                 .compatible = "st,stih416-irq-syscfg",
53                 .data = (void *)STIH416_SYSCFG_7543,
54         },
55         {
56                 .compatible = "st,stih407-irq-syscfg",
57                 .data = (void *)STIH407_SYSCFG_5102,
58         },
59         {
60                 .compatible = "st,stid127-irq-syscfg",
61                 .data = (void *)STID127_SYSCFG_734,
62         },
63         {}
64 };
65
66 static int st_irq_xlate(struct platform_device *pdev,
67                         int device, int channel, bool irq)
68 {
69         struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
70
71         /* Set the device enable bit. */
72         switch (device) {
73         case ST_IRQ_SYSCFG_EXT_0:
74                 ddata->config |= ST_A9_IRQ_EN_EXT_0;
75                 break;
76         case ST_IRQ_SYSCFG_EXT_1:
77                 ddata->config |= ST_A9_IRQ_EN_EXT_1;
78                 break;
79         case ST_IRQ_SYSCFG_EXT_2:
80                 ddata->config |= ST_A9_IRQ_EN_EXT_2;
81                 break;
82         case ST_IRQ_SYSCFG_CTI_0:
83                 ddata->config |= ST_A9_IRQ_EN_CTI_0;
84                 break;
85         case ST_IRQ_SYSCFG_CTI_1:
86                 ddata->config |= ST_A9_IRQ_EN_CTI_1;
87                 break;
88         case ST_IRQ_SYSCFG_PMU_0:
89                 ddata->config |= ST_A9_IRQ_EN_PMU_0;
90                 break;
91         case ST_IRQ_SYSCFG_PMU_1:
92                 ddata->config |= ST_A9_IRQ_EN_PMU_1;
93                 break;
94         case ST_IRQ_SYSCFG_pl310_L2:
95                 ddata->config |= ST_A9_IRQ_EN_PL310_L2;
96                 break;
97         case ST_IRQ_SYSCFG_DISABLED:
98                 return 0;
99         default:
100                 dev_err(&pdev->dev, "Unrecognised device %d\n", device);
101                 return -EINVAL;
102         }
103
104         /* Select IRQ/FIQ channel for device. */
105         ddata->config |= irq ?
106                 ST_A9_IRQ_N_SEL(device, channel) :
107                 ST_A9_FIQ_N_SEL(device, channel);
108
109         return 0;
110 }
111
112 static int st_irq_syscfg_enable(struct platform_device *pdev)
113 {
114         struct device_node *np = pdev->dev.of_node;
115         struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
116         int channels, ret, i;
117         u32 device, invert;
118
119         channels = of_property_count_u32_elems(np, "st,irq-device");
120         if (channels != ST_A9_IRQ_MAX_CHANS) {
121                 dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
122                 return -EINVAL;
123         }
124
125         channels = of_property_count_u32_elems(np, "st,fiq-device");
126         if (channels != ST_A9_IRQ_MAX_CHANS) {
127                 dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
128                 return -EINVAL;
129         }
130
131         for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
132                 of_property_read_u32_index(np, "st,irq-device", i, &device);
133
134                 ret = st_irq_xlate(pdev, device, i, true);
135                 if (ret)
136                         return ret;
137
138                 of_property_read_u32_index(np, "st,fiq-device", i, &device);
139
140                 ret = st_irq_xlate(pdev, device, i, false);
141                 if (ret)
142                         return ret;
143         }
144
145         /* External IRQs may be inverted. */
146         of_property_read_u32(np, "st,invert-ext", &invert);
147         ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);
148
149         return regmap_update_bits(ddata->regmap, ddata->syscfg,
150                                   ST_A9_IRQ_MASK, ddata->config);
151 }
152
153 static int st_irq_syscfg_probe(struct platform_device *pdev)
154 {
155         struct device_node *np = pdev->dev.of_node;
156         const struct of_device_id *match;
157         struct st_irq_syscfg *ddata;
158
159         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
160         if (!ddata)
161                 return -ENOMEM;
162
163         match = of_match_device(st_irq_syscfg_match, &pdev->dev);
164         if (!match)
165                 return -ENODEV;
166
167         ddata->syscfg = (unsigned int)match->data;
168
169         ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
170         if (IS_ERR(ddata->regmap)) {
171                 dev_err(&pdev->dev, "syscfg phandle missing\n");
172                 return PTR_ERR(ddata->regmap);
173         }
174
175         dev_set_drvdata(&pdev->dev, ddata);
176
177         return st_irq_syscfg_enable(pdev);
178 }
179
180 static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
181 {
182         struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
183
184         return regmap_update_bits(ddata->regmap, ddata->syscfg,
185                                   ST_A9_IRQ_MASK, ddata->config);
186 }
187
188 static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
189
190 static struct platform_driver st_irq_syscfg_driver = {
191         .driver = {
192                 .name = "st_irq_syscfg",
193                 .pm = &st_irq_syscfg_pm_ops,
194                 .of_match_table = st_irq_syscfg_match,
195         },
196         .probe = st_irq_syscfg_probe,
197 };
198
199 static int __init st_irq_syscfg_init(void)
200 {
201         return platform_driver_register(&st_irq_syscfg_driver);
202 }
203 core_initcall(st_irq_syscfg_init);