1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2015 Marek Vasut <marex@denx.de>
5 * DesignWare APB GPIO driver
10 #include <asm/arch/gpio.h>
14 #include <dm/device-internal.h>
15 #include <dm/device_compat.h>
16 #include <dm/devres.h>
22 #define GPIO_SWPORT_DR(p) (0x00 + (p) * 0xc)
23 #define GPIO_SWPORT_DDR(p) (0x04 + (p) * 0xc)
24 #define GPIO_INTEN 0x30
25 #define GPIO_INTMASK 0x34
26 #define GPIO_INTTYPE_LEVEL 0x38
27 #define GPIO_INT_POLARITY 0x3c
28 #define GPIO_INTSTATUS 0x40
29 #define GPIO_PORTA_DEBOUNCE 0x48
30 #define GPIO_PORTA_EOI 0x4c
31 #define GPIO_EXT_PORT(p) (0x50 + (p) * 4)
33 struct gpio_dwapb_priv {
34 struct reset_ctl_bulk resets;
37 struct gpio_dwapb_platdata {
44 static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
46 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
48 clrbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
52 static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
55 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
57 setbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
60 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
62 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
67 static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
69 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
70 return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
74 static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
76 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
79 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
81 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
86 static int dwapb_gpio_get_function(struct udevice *dev, unsigned offset)
88 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
91 gpio = readl(plat->base + GPIO_SWPORT_DDR(plat->bank));
93 if (gpio & BIT(offset))
99 static const struct dm_gpio_ops gpio_dwapb_ops = {
100 .direction_input = dwapb_gpio_direction_input,
101 .direction_output = dwapb_gpio_direction_output,
102 .get_value = dwapb_gpio_get_value,
103 .set_value = dwapb_gpio_set_value,
104 .get_function = dwapb_gpio_get_function,
107 static int gpio_dwapb_reset(struct udevice *dev)
110 struct gpio_dwapb_priv *priv = dev_get_priv(dev);
112 ret = reset_get_bulk(dev, &priv->resets);
114 /* Return 0 if error due to !CONFIG_DM_RESET and reset
115 * DT property is not present.
117 if (ret == -ENOENT || ret == -ENOTSUPP)
120 dev_warn(dev, "Can't get reset: %d\n", ret);
124 ret = reset_deassert_bulk(&priv->resets);
126 reset_release_bulk(&priv->resets);
127 dev_err(dev, "Failed to reset: %d\n", ret);
134 static int gpio_dwapb_probe(struct udevice *dev)
136 struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
137 struct gpio_dwapb_platdata *plat = dev->platdata;
140 /* Reset on parent device only */
141 return gpio_dwapb_reset(dev);
144 priv->gpio_count = plat->pins;
145 priv->bank_name = plat->name;
150 static int gpio_dwapb_bind(struct udevice *dev)
152 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
153 struct udevice *subdev;
158 /* If this is a child device, there is nothing to do here */
162 base = dev_read_addr(dev);
163 if (base == FDT_ADDR_T_NONE) {
164 debug("Can't get the GPIO register base address\n");
168 for (node = dev_read_first_subnode(dev); ofnode_valid(node);
169 node = dev_read_next_subnode(node)) {
170 if (!ofnode_read_bool(node, "gpio-controller"))
173 plat = devm_kcalloc(dev, 1, sizeof(*plat), GFP_KERNEL);
179 plat->pins = ofnode_read_u32_default(node, "snps,nr-gpios", 0);
181 if (ofnode_read_string_index(node, "bank-name", 0,
184 * Fall back to node name. This means accessing pins
185 * via bank name won't work.
187 plat->name = ofnode_get_name(node);
190 ret = device_bind_ofnode(dev, dev->driver, plat->name,
191 plat, node, &subdev);
201 static int gpio_dwapb_remove(struct udevice *dev)
203 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
204 struct gpio_dwapb_priv *priv = dev_get_priv(dev);
207 return reset_release_bulk(&priv->resets);
212 static const struct udevice_id gpio_dwapb_ids[] = {
213 { .compatible = "snps,dw-apb-gpio" },
217 U_BOOT_DRIVER(gpio_dwapb) = {
218 .name = "gpio-dwapb",
220 .of_match = gpio_dwapb_ids,
221 .ops = &gpio_dwapb_ops,
222 .bind = gpio_dwapb_bind,
223 .probe = gpio_dwapb_probe,
224 .remove = gpio_dwapb_remove,
225 .priv_auto_alloc_size = sizeof(struct gpio_dwapb_priv),