1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2015 Marek Vasut <marex@denx.de>
4 *
5 * DesignWare APB GPIO driver
6 */
7
8 #include <common.h>
9 #include <malloc.h>
10 #include <asm/arch/gpio.h>
11 #include <asm/gpio.h>
12 #include <asm/io.h>
13 #include <dm.h>
14 #include <dm/device-internal.h>
15 #include <dm/lists.h>
16 #include <dm/root.h>
17 #include <errno.h>
18 #include <reset.h>
19
20 DECLARE_GLOBAL_DATA_PTR;
21
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)
32
33 struct gpio_dwapb_priv {
34 struct reset_ctl_bulk resets;
35 };
36
37 struct gpio_dwapb_platdata {
38 const char *name;
39 int bank;
40 int pins;
41 fdt_addr_t base;
42 };
43
dwapb_gpio_direction_input(struct udevice * dev,unsigned pin)44 static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
45 {
46 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
47
48 clrbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
49 return 0;
50 }
51
dwapb_gpio_direction_output(struct udevice * dev,unsigned pin,int val)52 static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
53 int val)
54 {
55 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
56
57 setbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
58
59 if (val)
60 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
61 else
62 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
63
64 return 0;
65 }
66
dwapb_gpio_get_value(struct udevice * dev,unsigned pin)67 static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
68 {
69 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
70 return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
71 }
72
73
dwapb_gpio_set_value(struct udevice * dev,unsigned pin,int val)74 static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
75 {
76 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
77
78 if (val)
79 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
80 else
81 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
82
83 return 0;
84 }
85
dwapb_gpio_get_function(struct udevice * dev,unsigned offset)86 static int dwapb_gpio_get_function(struct udevice *dev, unsigned offset)
87 {
88 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
89 u32 gpio;
90
91 gpio = readl(plat->base + GPIO_SWPORT_DDR(plat->bank));
92
93 if (gpio & BIT(offset))
94 return GPIOF_OUTPUT;
95 else
96 return GPIOF_INPUT;
97 }
98
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,
105 };
106
gpio_dwapb_reset(struct udevice * dev)107 static int gpio_dwapb_reset(struct udevice *dev)
108 {
109 int ret;
110 struct gpio_dwapb_priv *priv = dev_get_priv(dev);
111
112 ret = reset_get_bulk(dev, &priv->resets);
113 if (ret) {
114 /* Return 0 if error due to !CONFIG_DM_RESET and reset
115 * DT property is not present.
116 */
117 if (ret == -ENOENT || ret == -ENOTSUPP)
118 return 0;
119
120 dev_warn(dev, "Can't get reset: %d\n", ret);
121 return ret;
122 }
123
124 ret = reset_deassert_bulk(&priv->resets);
125 if (ret) {
126 reset_release_bulk(&priv->resets);
127 dev_err(dev, "Failed to reset: %d\n", ret);
128 return ret;
129 }
130
131 return 0;
132 }
133
gpio_dwapb_probe(struct udevice * dev)134 static int gpio_dwapb_probe(struct udevice *dev)
135 {
136 struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
137 struct gpio_dwapb_platdata *plat = dev->platdata;
138
139 if (!plat) {
140 /* Reset on parent device only */
141 return gpio_dwapb_reset(dev);
142 }
143
144 priv->gpio_count = plat->pins;
145 priv->bank_name = plat->name;
146
147 return 0;
148 }
149
gpio_dwapb_bind(struct udevice * dev)150 static int gpio_dwapb_bind(struct udevice *dev)
151 {
152 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
153 const void *blob = gd->fdt_blob;
154 struct udevice *subdev;
155 fdt_addr_t base;
156 int ret, node, bank = 0;
157
158 /* If this is a child device, there is nothing to do here */
159 if (plat)
160 return 0;
161
162 base = dev_read_addr(dev);
163 if (base == FDT_ADDR_T_NONE) {
164 debug("Can't get the GPIO register base address\n");
165 return -ENXIO;
166 }
167
168 for (node = fdt_first_subnode(blob, dev_of_offset(dev));
169 node > 0;
170 node = fdt_next_subnode(blob, node)) {
171 if (!fdtdec_get_bool(blob, node, "gpio-controller"))
172 continue;
173
174 plat = devm_kcalloc(dev, 1, sizeof(*plat), GFP_KERNEL);
175 if (!plat)
176 return -ENOMEM;
177
178 plat->base = base;
179 plat->bank = bank;
180 plat->pins = fdtdec_get_int(blob, node, "snps,nr-gpios", 0);
181 plat->name = fdt_stringlist_get(blob, node, "bank-name", 0,
182 NULL);
183 if (!plat->name) {
184 /*
185 * Fall back to node name. This means accessing pins
186 * via bank name won't work.
187 */
188 plat->name = fdt_get_name(blob, node, NULL);
189 }
190
191 ret = device_bind(dev, dev->driver, plat->name,
192 plat, -1, &subdev);
193 if (ret)
194 return ret;
195
196 dev_set_of_offset(subdev, node);
197 bank++;
198 }
199
200 return 0;
201 }
202
gpio_dwapb_remove(struct udevice * dev)203 static int gpio_dwapb_remove(struct udevice *dev)
204 {
205 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
206 struct gpio_dwapb_priv *priv = dev_get_priv(dev);
207
208 if (!plat && priv)
209 return reset_release_bulk(&priv->resets);
210
211 return 0;
212 }
213
214 static const struct udevice_id gpio_dwapb_ids[] = {
215 { .compatible = "snps,dw-apb-gpio" },
216 { }
217 };
218
219 U_BOOT_DRIVER(gpio_dwapb) = {
220 .name = "gpio-dwapb",
221 .id = UCLASS_GPIO,
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),
228 };
229