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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
39struct st_irq_syscfg {
40 struct regmap *regmap;
41 unsigned int syscfg;
42 unsigned int config;
43 bool ext_inverted;
44};
45
46static 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
66static 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
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
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
112static 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
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
153static 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
180static 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
188static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
189
190static 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
199static int __init st_irq_syscfg_init(void)
200{
201 return platform_driver_register(&st_irq_syscfg_driver);
202}
203core_initcall(st_irq_syscfg_init);
204
