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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
07088484 LJ |
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. | |
07088484 LJ |
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 | ||
f357563f | 180 | static int __maybe_unused st_irq_syscfg_resume(struct device *dev) |
07088484 LJ |
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); |