183d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+
2e30a70c2SMarek Vasut /*
3e30a70c2SMarek Vasut * (C) Copyright 2015 Marek Vasut <marex@denx.de>
4e30a70c2SMarek Vasut *
5e30a70c2SMarek Vasut * DesignWare APB GPIO driver
6e30a70c2SMarek Vasut */
7e30a70c2SMarek Vasut
8e30a70c2SMarek Vasut #include <common.h>
9e30a70c2SMarek Vasut #include <malloc.h>
10e30a70c2SMarek Vasut #include <asm/arch/gpio.h>
11e30a70c2SMarek Vasut #include <asm/gpio.h>
12e30a70c2SMarek Vasut #include <asm/io.h>
13e30a70c2SMarek Vasut #include <dm.h>
14e30a70c2SMarek Vasut #include <dm/device-internal.h>
15e30a70c2SMarek Vasut #include <dm/lists.h>
16e30a70c2SMarek Vasut #include <dm/root.h>
17e30a70c2SMarek Vasut #include <errno.h>
18db6a158bSLey Foon Tan #include <reset.h>
19e30a70c2SMarek Vasut
20e30a70c2SMarek Vasut DECLARE_GLOBAL_DATA_PTR;
21e30a70c2SMarek Vasut
222d0c2c47SPhil Edworthy #define GPIO_SWPORT_DR(p) (0x00 + (p) * 0xc)
232d0c2c47SPhil Edworthy #define GPIO_SWPORT_DDR(p) (0x04 + (p) * 0xc)
24e30a70c2SMarek Vasut #define GPIO_INTEN 0x30
25e30a70c2SMarek Vasut #define GPIO_INTMASK 0x34
26e30a70c2SMarek Vasut #define GPIO_INTTYPE_LEVEL 0x38
27e30a70c2SMarek Vasut #define GPIO_INT_POLARITY 0x3c
28e30a70c2SMarek Vasut #define GPIO_INTSTATUS 0x40
29e30a70c2SMarek Vasut #define GPIO_PORTA_DEBOUNCE 0x48
30e30a70c2SMarek Vasut #define GPIO_PORTA_EOI 0x4c
312d0c2c47SPhil Edworthy #define GPIO_EXT_PORT(p) (0x50 + (p) * 4)
32e30a70c2SMarek Vasut
33db6a158bSLey Foon Tan struct gpio_dwapb_priv {
34db6a158bSLey Foon Tan struct reset_ctl_bulk resets;
35db6a158bSLey Foon Tan };
36db6a158bSLey Foon Tan
37e30a70c2SMarek Vasut struct gpio_dwapb_platdata {
38e30a70c2SMarek Vasut const char *name;
39e30a70c2SMarek Vasut int bank;
40e30a70c2SMarek Vasut int pins;
41e30a70c2SMarek Vasut fdt_addr_t base;
42e30a70c2SMarek Vasut };
43e30a70c2SMarek Vasut
dwapb_gpio_direction_input(struct udevice * dev,unsigned pin)44e30a70c2SMarek Vasut static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
45e30a70c2SMarek Vasut {
46e30a70c2SMarek Vasut struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
47e30a70c2SMarek Vasut
482d0c2c47SPhil Edworthy clrbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
49e30a70c2SMarek Vasut return 0;
50e30a70c2SMarek Vasut }
51e30a70c2SMarek Vasut
dwapb_gpio_direction_output(struct udevice * dev,unsigned pin,int val)52e30a70c2SMarek Vasut static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
53e30a70c2SMarek Vasut int val)
54e30a70c2SMarek Vasut {
55e30a70c2SMarek Vasut struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
56e30a70c2SMarek Vasut
572d0c2c47SPhil Edworthy setbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
58e30a70c2SMarek Vasut
59e30a70c2SMarek Vasut if (val)
602d0c2c47SPhil Edworthy setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
61e30a70c2SMarek Vasut else
622d0c2c47SPhil Edworthy clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
63e30a70c2SMarek Vasut
64e30a70c2SMarek Vasut return 0;
65e30a70c2SMarek Vasut }
66e30a70c2SMarek Vasut
dwapb_gpio_get_value(struct udevice * dev,unsigned pin)67e30a70c2SMarek Vasut static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
68e30a70c2SMarek Vasut {
69e30a70c2SMarek Vasut struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
702d0c2c47SPhil Edworthy return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
71e30a70c2SMarek Vasut }
72e30a70c2SMarek Vasut
73e30a70c2SMarek Vasut
dwapb_gpio_set_value(struct udevice * dev,unsigned pin,int val)74e30a70c2SMarek Vasut static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
75e30a70c2SMarek Vasut {
76e30a70c2SMarek Vasut struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
77e30a70c2SMarek Vasut
78e30a70c2SMarek Vasut if (val)
792d0c2c47SPhil Edworthy setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
80e30a70c2SMarek Vasut else
812d0c2c47SPhil Edworthy clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
82e30a70c2SMarek Vasut
83e30a70c2SMarek Vasut return 0;
84e30a70c2SMarek Vasut }
85e30a70c2SMarek Vasut
dwapb_gpio_get_function(struct udevice * dev,unsigned offset)8671f2700bSLey Foon Tan static int dwapb_gpio_get_function(struct udevice *dev, unsigned offset)
8771f2700bSLey Foon Tan {
8871f2700bSLey Foon Tan struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
8971f2700bSLey Foon Tan u32 gpio;
9071f2700bSLey Foon Tan
9171f2700bSLey Foon Tan gpio = readl(plat->base + GPIO_SWPORT_DDR(plat->bank));
9271f2700bSLey Foon Tan
9371f2700bSLey Foon Tan if (gpio & BIT(offset))
9471f2700bSLey Foon Tan return GPIOF_OUTPUT;
9571f2700bSLey Foon Tan else
9671f2700bSLey Foon Tan return GPIOF_INPUT;
9771f2700bSLey Foon Tan }
9871f2700bSLey Foon Tan
99e30a70c2SMarek Vasut static const struct dm_gpio_ops gpio_dwapb_ops = {
100e30a70c2SMarek Vasut .direction_input = dwapb_gpio_direction_input,
101e30a70c2SMarek Vasut .direction_output = dwapb_gpio_direction_output,
102e30a70c2SMarek Vasut .get_value = dwapb_gpio_get_value,
103e30a70c2SMarek Vasut .set_value = dwapb_gpio_set_value,
10471f2700bSLey Foon Tan .get_function = dwapb_gpio_get_function,
105e30a70c2SMarek Vasut };
106e30a70c2SMarek Vasut
gpio_dwapb_reset(struct udevice * dev)107db6a158bSLey Foon Tan static int gpio_dwapb_reset(struct udevice *dev)
108db6a158bSLey Foon Tan {
109db6a158bSLey Foon Tan int ret;
110db6a158bSLey Foon Tan struct gpio_dwapb_priv *priv = dev_get_priv(dev);
111db6a158bSLey Foon Tan
112db6a158bSLey Foon Tan ret = reset_get_bulk(dev, &priv->resets);
113db6a158bSLey Foon Tan if (ret) {
114db6a158bSLey Foon Tan /* Return 0 if error due to !CONFIG_DM_RESET and reset
115db6a158bSLey Foon Tan * DT property is not present.
116db6a158bSLey Foon Tan */
117db6a158bSLey Foon Tan if (ret == -ENOENT || ret == -ENOTSUPP)
118db6a158bSLey Foon Tan return 0;
119db6a158bSLey Foon Tan
120db6a158bSLey Foon Tan dev_warn(dev, "Can't get reset: %d\n", ret);
121db6a158bSLey Foon Tan return ret;
122db6a158bSLey Foon Tan }
123db6a158bSLey Foon Tan
124db6a158bSLey Foon Tan ret = reset_deassert_bulk(&priv->resets);
125db6a158bSLey Foon Tan if (ret) {
126db6a158bSLey Foon Tan reset_release_bulk(&priv->resets);
127db6a158bSLey Foon Tan dev_err(dev, "Failed to reset: %d\n", ret);
128db6a158bSLey Foon Tan return ret;
129db6a158bSLey Foon Tan }
130db6a158bSLey Foon Tan
131db6a158bSLey Foon Tan return 0;
132db6a158bSLey Foon Tan }
133db6a158bSLey Foon Tan
gpio_dwapb_probe(struct udevice * dev)134e30a70c2SMarek Vasut static int gpio_dwapb_probe(struct udevice *dev)
135e30a70c2SMarek Vasut {
136e30a70c2SMarek Vasut struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
137e30a70c2SMarek Vasut struct gpio_dwapb_platdata *plat = dev->platdata;
138e30a70c2SMarek Vasut
139db6a158bSLey Foon Tan if (!plat) {
140db6a158bSLey Foon Tan /* Reset on parent device only */
141db6a158bSLey Foon Tan return gpio_dwapb_reset(dev);
142db6a158bSLey Foon Tan }
143e30a70c2SMarek Vasut
144e30a70c2SMarek Vasut priv->gpio_count = plat->pins;
145e30a70c2SMarek Vasut priv->bank_name = plat->name;
146e30a70c2SMarek Vasut
147e30a70c2SMarek Vasut return 0;
148e30a70c2SMarek Vasut }
149e30a70c2SMarek Vasut
gpio_dwapb_bind(struct udevice * dev)150e30a70c2SMarek Vasut static int gpio_dwapb_bind(struct udevice *dev)
151e30a70c2SMarek Vasut {
152e30a70c2SMarek Vasut struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
153e30a70c2SMarek Vasut const void *blob = gd->fdt_blob;
154e30a70c2SMarek Vasut struct udevice *subdev;
155e30a70c2SMarek Vasut fdt_addr_t base;
156e30a70c2SMarek Vasut int ret, node, bank = 0;
157e30a70c2SMarek Vasut
158e30a70c2SMarek Vasut /* If this is a child device, there is nothing to do here */
159e30a70c2SMarek Vasut if (plat)
160e30a70c2SMarek Vasut return 0;
161e30a70c2SMarek Vasut
1629ea35444SLey Foon Tan base = dev_read_addr(dev);
163e30a70c2SMarek Vasut if (base == FDT_ADDR_T_NONE) {
164e30a70c2SMarek Vasut debug("Can't get the GPIO register base address\n");
165e30a70c2SMarek Vasut return -ENXIO;
166e30a70c2SMarek Vasut }
167e30a70c2SMarek Vasut
168e160f7d4SSimon Glass for (node = fdt_first_subnode(blob, dev_of_offset(dev));
169e30a70c2SMarek Vasut node > 0;
170e30a70c2SMarek Vasut node = fdt_next_subnode(blob, node)) {
171e30a70c2SMarek Vasut if (!fdtdec_get_bool(blob, node, "gpio-controller"))
172e30a70c2SMarek Vasut continue;
173e30a70c2SMarek Vasut
17486d56a5dSLey Foon Tan plat = devm_kcalloc(dev, 1, sizeof(*plat), GFP_KERNEL);
175e30a70c2SMarek Vasut if (!plat)
176e30a70c2SMarek Vasut return -ENOMEM;
177e30a70c2SMarek Vasut
178e30a70c2SMarek Vasut plat->base = base;
179e30a70c2SMarek Vasut plat->bank = bank;
180e30a70c2SMarek Vasut plat->pins = fdtdec_get_int(blob, node, "snps,nr-gpios", 0);
181b02e4044SSimon Glass plat->name = fdt_stringlist_get(blob, node, "bank-name", 0,
182b02e4044SSimon Glass NULL);
183*89f1fe5bSSimon Goldschmidt if (!plat->name) {
184*89f1fe5bSSimon Goldschmidt /*
185*89f1fe5bSSimon Goldschmidt * Fall back to node name. This means accessing pins
186*89f1fe5bSSimon Goldschmidt * via bank name won't work.
187*89f1fe5bSSimon Goldschmidt */
188*89f1fe5bSSimon Goldschmidt plat->name = fdt_get_name(blob, node, NULL);
189*89f1fe5bSSimon Goldschmidt }
190e30a70c2SMarek Vasut
191e30a70c2SMarek Vasut ret = device_bind(dev, dev->driver, plat->name,
192e30a70c2SMarek Vasut plat, -1, &subdev);
193e30a70c2SMarek Vasut if (ret)
19486d56a5dSLey Foon Tan return ret;
195e30a70c2SMarek Vasut
196e160f7d4SSimon Glass dev_set_of_offset(subdev, node);
197e30a70c2SMarek Vasut bank++;
198e30a70c2SMarek Vasut }
199e30a70c2SMarek Vasut
200e30a70c2SMarek Vasut return 0;
201e30a70c2SMarek Vasut }
202e30a70c2SMarek Vasut
gpio_dwapb_remove(struct udevice * dev)203db6a158bSLey Foon Tan static int gpio_dwapb_remove(struct udevice *dev)
204db6a158bSLey Foon Tan {
205db6a158bSLey Foon Tan struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
206db6a158bSLey Foon Tan struct gpio_dwapb_priv *priv = dev_get_priv(dev);
207db6a158bSLey Foon Tan
208db6a158bSLey Foon Tan if (!plat && priv)
209db6a158bSLey Foon Tan return reset_release_bulk(&priv->resets);
210db6a158bSLey Foon Tan
211db6a158bSLey Foon Tan return 0;
212db6a158bSLey Foon Tan }
213db6a158bSLey Foon Tan
214e30a70c2SMarek Vasut static const struct udevice_id gpio_dwapb_ids[] = {
215e30a70c2SMarek Vasut { .compatible = "snps,dw-apb-gpio" },
216e30a70c2SMarek Vasut { }
217e30a70c2SMarek Vasut };
218e30a70c2SMarek Vasut
219e30a70c2SMarek Vasut U_BOOT_DRIVER(gpio_dwapb) = {
220e30a70c2SMarek Vasut .name = "gpio-dwapb",
221e30a70c2SMarek Vasut .id = UCLASS_GPIO,
222e30a70c2SMarek Vasut .of_match = gpio_dwapb_ids,
223e30a70c2SMarek Vasut .ops = &gpio_dwapb_ops,
224e30a70c2SMarek Vasut .bind = gpio_dwapb_bind,
225e30a70c2SMarek Vasut .probe = gpio_dwapb_probe,
226db6a158bSLey Foon Tan .remove = gpio_dwapb_remove,
227db6a158bSLey Foon Tan .priv_auto_alloc_size = sizeof(struct gpio_dwapb_priv),
228e30a70c2SMarek Vasut };
229