1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2015 Marek Vasut <marex@denx.de>
5 * DesignWare APB GPIO driver
11 #include <asm/arch/gpio.h>
15 #include <dm/device-internal.h>
16 #include <dm/device_compat.h>
17 #include <dm/devres.h>
22 #include <linux/bitops.h>
24 #define GPIO_SWPORT_DR(p) (0x00 + (p) * 0xc)
25 #define GPIO_SWPORT_DDR(p) (0x04 + (p) * 0xc)
26 #define GPIO_INTEN 0x30
27 #define GPIO_INTMASK 0x34
28 #define GPIO_INTTYPE_LEVEL 0x38
29 #define GPIO_INT_POLARITY 0x3c
30 #define GPIO_INTSTATUS 0x40
31 #define GPIO_PORTA_DEBOUNCE 0x48
32 #define GPIO_PORTA_EOI 0x4c
33 #define GPIO_EXT_PORT(p) (0x50 + (p) * 4)
35 struct gpio_dwapb_priv {
36 struct reset_ctl_bulk resets;
39 struct gpio_dwapb_platdata {
46 static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
48 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
50 clrbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
54 static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
57 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
59 setbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
62 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
64 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
69 static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
71 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
72 return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
76 static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
78 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
81 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
83 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
88 static int dwapb_gpio_get_function(struct udevice *dev, unsigned offset)
90 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
93 gpio = readl(plat->base + GPIO_SWPORT_DDR(plat->bank));
95 if (gpio & BIT(offset))
101 static const struct dm_gpio_ops gpio_dwapb_ops = {
102 .direction_input = dwapb_gpio_direction_input,
103 .direction_output = dwapb_gpio_direction_output,
104 .get_value = dwapb_gpio_get_value,
105 .set_value = dwapb_gpio_set_value,
106 .get_function = dwapb_gpio_get_function,
109 static int gpio_dwapb_reset(struct udevice *dev)
112 struct gpio_dwapb_priv *priv = dev_get_priv(dev);
114 ret = reset_get_bulk(dev, &priv->resets);
116 /* Return 0 if error due to !CONFIG_DM_RESET and reset
117 * DT property is not present.
119 if (ret == -ENOENT || ret == -ENOTSUPP)
122 dev_warn(dev, "Can't get reset: %d\n", ret);
126 ret = reset_deassert_bulk(&priv->resets);
128 reset_release_bulk(&priv->resets);
129 dev_err(dev, "Failed to reset: %d\n", ret);
136 static int gpio_dwapb_probe(struct udevice *dev)
138 struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
139 struct gpio_dwapb_platdata *plat = dev->platdata;
142 /* Reset on parent device only */
143 return gpio_dwapb_reset(dev);
146 priv->gpio_count = plat->pins;
147 priv->bank_name = plat->name;
152 static int gpio_dwapb_bind(struct udevice *dev)
154 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
155 struct udevice *subdev;
160 /* If this is a child device, there is nothing to do here */
164 base = dev_read_addr(dev);
165 if (base == FDT_ADDR_T_NONE) {
166 debug("Can't get the GPIO register base address\n");
170 for (node = dev_read_first_subnode(dev); ofnode_valid(node);
171 node = dev_read_next_subnode(node)) {
172 if (!ofnode_read_bool(node, "gpio-controller"))
175 plat = devm_kcalloc(dev, 1, sizeof(*plat), GFP_KERNEL);
181 plat->pins = ofnode_read_u32_default(node, "snps,nr-gpios", 0);
183 if (ofnode_read_string_index(node, "bank-name", 0,
186 * Fall back to node name. This means accessing pins
187 * via bank name won't work.
189 plat->name = ofnode_get_name(node);
192 ret = device_bind_ofnode(dev, dev->driver, plat->name,
193 plat, node, &subdev);
203 static int gpio_dwapb_remove(struct udevice *dev)
205 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
206 struct gpio_dwapb_priv *priv = dev_get_priv(dev);
209 return reset_release_bulk(&priv->resets);
214 static const struct udevice_id gpio_dwapb_ids[] = {
215 { .compatible = "snps,dw-apb-gpio" },
219 U_BOOT_DRIVER(gpio_dwapb) = {
220 .name = "gpio-dwapb",
222 .of_match = gpio_dwapb_ids,
223 .ops = &gpio_dwapb_ops,
224 .bind = gpio_dwapb_bind,
225 .probe = gpio_dwapb_probe,
226 .remove = gpio_dwapb_remove,
227 .priv_auto_alloc_size = sizeof(struct gpio_dwapb_priv),