Commit | Line | Data |
---|---|---|
2ad74f40 NI |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Toshiba Visconti GPIO Support | |
4 | * | |
5 | * (C) Copyright 2020 Toshiba Electronic Devices & Storage Corporation | |
6 | * (C) Copyright 2020 TOSHIBA CORPORATION | |
7 | * | |
8 | * Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> | |
9 | */ | |
10 | ||
11 | #include <linux/gpio/driver.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/of_irq.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/bitops.h> | |
19 | ||
20 | /* register offset */ | |
21 | #define GPIO_DIR 0x00 | |
22 | #define GPIO_IDATA 0x08 | |
23 | #define GPIO_ODATA 0x10 | |
24 | #define GPIO_OSET 0x18 | |
25 | #define GPIO_OCLR 0x20 | |
26 | #define GPIO_INTMODE 0x30 | |
27 | ||
28 | #define BASE_HW_IRQ 24 | |
29 | ||
30 | struct visconti_gpio { | |
31 | void __iomem *base; | |
32 | spinlock_t lock; /* protect gpio register */ | |
33 | struct gpio_chip gpio_chip; | |
34 | struct irq_chip irq_chip; | |
35 | }; | |
36 | ||
37 | static int visconti_gpio_irq_set_type(struct irq_data *d, unsigned int type) | |
38 | { | |
39 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
40 | struct visconti_gpio *priv = gpiochip_get_data(gc); | |
41 | u32 offset = irqd_to_hwirq(d); | |
42 | u32 bit = BIT(offset); | |
43 | u32 intc_type = IRQ_TYPE_EDGE_RISING; | |
44 | u32 intmode, odata; | |
45 | int ret = 0; | |
46 | unsigned long flags; | |
47 | ||
48 | spin_lock_irqsave(&priv->lock, flags); | |
49 | ||
50 | odata = readl(priv->base + GPIO_ODATA); | |
51 | intmode = readl(priv->base + GPIO_INTMODE); | |
52 | ||
53 | switch (type) { | |
54 | case IRQ_TYPE_EDGE_RISING: | |
55 | odata &= ~bit; | |
56 | intmode &= ~bit; | |
57 | break; | |
58 | case IRQ_TYPE_EDGE_FALLING: | |
59 | odata |= bit; | |
60 | intmode &= ~bit; | |
61 | break; | |
62 | case IRQ_TYPE_EDGE_BOTH: | |
63 | intmode |= bit; | |
64 | break; | |
65 | case IRQ_TYPE_LEVEL_HIGH: | |
66 | intc_type = IRQ_TYPE_LEVEL_HIGH; | |
67 | odata &= ~bit; | |
68 | intmode &= ~bit; | |
69 | break; | |
70 | case IRQ_TYPE_LEVEL_LOW: | |
71 | intc_type = IRQ_TYPE_LEVEL_HIGH; | |
72 | odata |= bit; | |
73 | intmode &= ~bit; | |
74 | break; | |
75 | default: | |
76 | ret = -EINVAL; | |
77 | goto err; | |
78 | } | |
79 | ||
80 | writel(odata, priv->base + GPIO_ODATA); | |
81 | writel(intmode, priv->base + GPIO_INTMODE); | |
82 | irq_set_irq_type(offset, intc_type); | |
83 | ||
84 | ret = irq_chip_set_type_parent(d, type); | |
85 | err: | |
86 | spin_unlock_irqrestore(&priv->lock, flags); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | static int visconti_gpio_child_to_parent_hwirq(struct gpio_chip *gc, | |
91 | unsigned int child, | |
92 | unsigned int child_type, | |
93 | unsigned int *parent, | |
94 | unsigned int *parent_type) | |
95 | { | |
96 | /* Interrupts 0..15 mapped to interrupts 24..39 on the GIC */ | |
97 | if (child < 16) { | |
98 | /* All these interrupts are level high in the CPU */ | |
99 | *parent_type = IRQ_TYPE_LEVEL_HIGH; | |
100 | *parent = child + BASE_HW_IRQ; | |
101 | return 0; | |
102 | } | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | static void *visconti_gpio_populate_parent_fwspec(struct gpio_chip *chip, | |
107 | unsigned int parent_hwirq, | |
108 | unsigned int parent_type) | |
109 | { | |
110 | struct irq_fwspec *fwspec; | |
111 | ||
112 | fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL); | |
113 | if (!fwspec) | |
114 | return NULL; | |
115 | ||
116 | fwspec->fwnode = chip->irq.parent_domain->fwnode; | |
117 | fwspec->param_count = 3; | |
118 | fwspec->param[0] = 0; | |
119 | fwspec->param[1] = parent_hwirq; | |
120 | fwspec->param[2] = parent_type; | |
121 | ||
122 | return fwspec; | |
123 | } | |
124 | ||
125 | static int visconti_gpio_probe(struct platform_device *pdev) | |
126 | { | |
127 | struct device *dev = &pdev->dev; | |
128 | struct visconti_gpio *priv; | |
129 | struct irq_chip *irq_chip; | |
130 | struct gpio_irq_chip *girq; | |
131 | struct irq_domain *parent; | |
132 | struct device_node *irq_parent; | |
133 | struct fwnode_handle *fwnode; | |
134 | int ret; | |
135 | ||
136 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
137 | if (!priv) | |
138 | return -ENOMEM; | |
139 | ||
140 | spin_lock_init(&priv->lock); | |
141 | ||
142 | priv->base = devm_platform_ioremap_resource(pdev, 0); | |
143 | if (IS_ERR(priv->base)) | |
144 | return PTR_ERR(priv->base); | |
145 | ||
146 | irq_parent = of_irq_find_parent(dev->of_node); | |
147 | if (!irq_parent) { | |
148 | dev_err(dev, "No IRQ parent node\n"); | |
149 | return -ENODEV; | |
150 | } | |
151 | ||
152 | parent = irq_find_host(irq_parent); | |
153 | if (!parent) { | |
154 | dev_err(dev, "No IRQ parent domain\n"); | |
155 | return -ENODEV; | |
156 | } | |
157 | ||
158 | fwnode = of_node_to_fwnode(irq_parent); | |
159 | of_node_put(irq_parent); | |
160 | ||
161 | ret = bgpio_init(&priv->gpio_chip, dev, 4, | |
162 | priv->base + GPIO_IDATA, | |
163 | priv->base + GPIO_OSET, | |
164 | priv->base + GPIO_OCLR, | |
165 | priv->base + GPIO_DIR, | |
166 | NULL, | |
167 | 0); | |
168 | if (ret) { | |
169 | dev_err(dev, "unable to init generic GPIO\n"); | |
170 | return ret; | |
171 | } | |
172 | ||
173 | irq_chip = &priv->irq_chip; | |
174 | irq_chip->name = dev_name(dev); | |
175 | irq_chip->irq_mask = irq_chip_mask_parent; | |
176 | irq_chip->irq_unmask = irq_chip_unmask_parent; | |
177 | irq_chip->irq_eoi = irq_chip_eoi_parent; | |
178 | irq_chip->irq_set_type = visconti_gpio_irq_set_type; | |
179 | irq_chip->flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_MASK_ON_SUSPEND; | |
180 | ||
181 | girq = &priv->gpio_chip.irq; | |
182 | girq->chip = irq_chip; | |
183 | girq->fwnode = fwnode; | |
184 | girq->parent_domain = parent; | |
185 | girq->child_to_parent_hwirq = visconti_gpio_child_to_parent_hwirq; | |
186 | girq->populate_parent_alloc_arg = visconti_gpio_populate_parent_fwspec; | |
187 | girq->default_type = IRQ_TYPE_NONE; | |
188 | girq->handler = handle_level_irq; | |
189 | ||
190 | ret = devm_gpiochip_add_data(dev, &priv->gpio_chip, priv); | |
191 | if (ret) { | |
192 | dev_err(dev, "failed to add GPIO chip\n"); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | platform_set_drvdata(pdev, priv); | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
201 | static const struct of_device_id visconti_gpio_of_match[] = { | |
202 | { .compatible = "toshiba,gpio-tmpv7708", }, | |
203 | { /* end of table */ } | |
204 | }; | |
205 | MODULE_DEVICE_TABLE(of, visconti_gpio_of_match); | |
206 | ||
207 | static struct platform_driver visconti_gpio_driver = { | |
208 | .probe = visconti_gpio_probe, | |
209 | .driver = { | |
210 | .name = "visconti_gpio", | |
211 | .of_match_table = of_match_ptr(visconti_gpio_of_match), | |
212 | } | |
213 | }; | |
214 | module_platform_driver(visconti_gpio_driver); | |
215 | ||
216 | MODULE_AUTHOR("Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>"); | |
217 | MODULE_DESCRIPTION("Toshiba Visconti GPIO Driver"); | |
218 | MODULE_LICENSE("GPL v2"); |