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.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/regmap.h> |
16 | #include <linux/slab.h> |
17 | |
18 | #define STIH407_SYSCFG_5102 0x198 |
19 | |
20 | #define ST_A9_IRQ_MASK 0x001FFFFF |
21 | #define ST_A9_IRQ_MAX_CHANS 2 |
22 | |
23 | #define ST_A9_IRQ_EN_CTI_0 BIT(0) |
24 | #define ST_A9_IRQ_EN_CTI_1 BIT(1) |
25 | #define ST_A9_IRQ_EN_PMU_0 BIT(2) |
26 | #define ST_A9_IRQ_EN_PMU_1 BIT(3) |
27 | #define ST_A9_IRQ_EN_PL310_L2 BIT(4) |
28 | #define ST_A9_IRQ_EN_EXT_0 BIT(5) |
29 | #define ST_A9_IRQ_EN_EXT_1 BIT(6) |
30 | #define ST_A9_IRQ_EN_EXT_2 BIT(7) |
31 | |
32 | #define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3))) |
33 | #define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3))) |
34 | #define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20) |
35 | |
36 | struct st_irq_syscfg { |
37 | struct regmap *regmap; |
38 | unsigned int syscfg; |
39 | unsigned int config; |
40 | bool ext_inverted; |
41 | }; |
42 | |
43 | static const struct of_device_id st_irq_syscfg_match[] = { |
44 | { |
45 | .compatible = "st,stih407-irq-syscfg" , |
46 | .data = (void *)STIH407_SYSCFG_5102, |
47 | }, |
48 | {} |
49 | }; |
50 | |
51 | static int st_irq_xlate(struct platform_device *pdev, |
52 | int device, int channel, bool irq) |
53 | { |
54 | struct st_irq_syscfg *ddata = dev_get_drvdata(dev: &pdev->dev); |
55 | |
56 | /* Set the device enable bit. */ |
57 | switch (device) { |
58 | case ST_IRQ_SYSCFG_EXT_0: |
59 | ddata->config |= ST_A9_IRQ_EN_EXT_0; |
60 | break; |
61 | case ST_IRQ_SYSCFG_EXT_1: |
62 | ddata->config |= ST_A9_IRQ_EN_EXT_1; |
63 | break; |
64 | case ST_IRQ_SYSCFG_EXT_2: |
65 | ddata->config |= ST_A9_IRQ_EN_EXT_2; |
66 | break; |
67 | case ST_IRQ_SYSCFG_CTI_0: |
68 | ddata->config |= ST_A9_IRQ_EN_CTI_0; |
69 | break; |
70 | case ST_IRQ_SYSCFG_CTI_1: |
71 | ddata->config |= ST_A9_IRQ_EN_CTI_1; |
72 | break; |
73 | case ST_IRQ_SYSCFG_PMU_0: |
74 | ddata->config |= ST_A9_IRQ_EN_PMU_0; |
75 | break; |
76 | case ST_IRQ_SYSCFG_PMU_1: |
77 | ddata->config |= ST_A9_IRQ_EN_PMU_1; |
78 | break; |
79 | case ST_IRQ_SYSCFG_pl310_L2: |
80 | ddata->config |= ST_A9_IRQ_EN_PL310_L2; |
81 | break; |
82 | case ST_IRQ_SYSCFG_DISABLED: |
83 | return 0; |
84 | default: |
85 | dev_err(&pdev->dev, "Unrecognised device %d\n" , device); |
86 | return -EINVAL; |
87 | } |
88 | |
89 | /* Select IRQ/FIQ channel for device. */ |
90 | ddata->config |= irq ? |
91 | ST_A9_IRQ_N_SEL(device, channel) : |
92 | ST_A9_FIQ_N_SEL(device, channel); |
93 | |
94 | return 0; |
95 | } |
96 | |
97 | static int st_irq_syscfg_enable(struct platform_device *pdev) |
98 | { |
99 | struct device_node *np = pdev->dev.of_node; |
100 | struct st_irq_syscfg *ddata = dev_get_drvdata(dev: &pdev->dev); |
101 | int channels, ret, i; |
102 | u32 device, invert; |
103 | |
104 | channels = of_property_count_u32_elems(np, propname: "st,irq-device" ); |
105 | if (channels != ST_A9_IRQ_MAX_CHANS) { |
106 | dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n" ); |
107 | return -EINVAL; |
108 | } |
109 | |
110 | channels = of_property_count_u32_elems(np, propname: "st,fiq-device" ); |
111 | if (channels != ST_A9_IRQ_MAX_CHANS) { |
112 | dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n" ); |
113 | return -EINVAL; |
114 | } |
115 | |
116 | for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) { |
117 | of_property_read_u32_index(np, propname: "st,irq-device" , index: i, out_value: &device); |
118 | |
119 | ret = st_irq_xlate(pdev, device, channel: i, irq: true); |
120 | if (ret) |
121 | return ret; |
122 | |
123 | of_property_read_u32_index(np, propname: "st,fiq-device" , index: i, out_value: &device); |
124 | |
125 | ret = st_irq_xlate(pdev, device, channel: i, irq: false); |
126 | if (ret) |
127 | return ret; |
128 | } |
129 | |
130 | /* External IRQs may be inverted. */ |
131 | of_property_read_u32(np, propname: "st,invert-ext" , out_value: &invert); |
132 | ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert); |
133 | |
134 | return regmap_update_bits(map: ddata->regmap, reg: ddata->syscfg, |
135 | ST_A9_IRQ_MASK, val: ddata->config); |
136 | } |
137 | |
138 | static int st_irq_syscfg_probe(struct platform_device *pdev) |
139 | { |
140 | struct device_node *np = pdev->dev.of_node; |
141 | struct st_irq_syscfg *ddata; |
142 | |
143 | ddata = devm_kzalloc(dev: &pdev->dev, size: sizeof(*ddata), GFP_KERNEL); |
144 | if (!ddata) |
145 | return -ENOMEM; |
146 | |
147 | ddata->syscfg = (unsigned int) device_get_match_data(dev: &pdev->dev); |
148 | |
149 | ddata->regmap = syscon_regmap_lookup_by_phandle(np, property: "st,syscfg" ); |
150 | if (IS_ERR(ptr: ddata->regmap)) { |
151 | dev_err(&pdev->dev, "syscfg phandle missing\n" ); |
152 | return PTR_ERR(ptr: ddata->regmap); |
153 | } |
154 | |
155 | dev_set_drvdata(dev: &pdev->dev, data: ddata); |
156 | |
157 | return st_irq_syscfg_enable(pdev); |
158 | } |
159 | |
160 | static int __maybe_unused st_irq_syscfg_resume(struct device *dev) |
161 | { |
162 | struct st_irq_syscfg *ddata = dev_get_drvdata(dev); |
163 | |
164 | return regmap_update_bits(map: ddata->regmap, reg: ddata->syscfg, |
165 | ST_A9_IRQ_MASK, val: ddata->config); |
166 | } |
167 | |
168 | static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume); |
169 | |
170 | static struct platform_driver st_irq_syscfg_driver = { |
171 | .driver = { |
172 | .name = "st_irq_syscfg" , |
173 | .pm = &st_irq_syscfg_pm_ops, |
174 | .of_match_table = st_irq_syscfg_match, |
175 | }, |
176 | .probe = st_irq_syscfg_probe, |
177 | }; |
178 | |
179 | static int __init st_irq_syscfg_init(void) |
180 | { |
181 | return platform_driver_register(&st_irq_syscfg_driver); |
182 | } |
183 | core_initcall(st_irq_syscfg_init); |
184 | |