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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Marek Vasute30a70c2015-06-23 15:54:19 +02002/*
3 * (C) Copyright 2015 Marek Vasut <marex@denx.de>
4 *
5 * DesignWare APB GPIO driver
Marek Vasute30a70c2015-06-23 15:54:19 +02006 */
7
8#include <common.h>
Simon Glassf7ae49f2020-05-10 11:40:05 -06009#include <log.h>
Marek Vasute30a70c2015-06-23 15:54:19 +020010#include <malloc.h>
11#include <asm/arch/gpio.h>
12#include <asm/gpio.h>
13#include <asm/io.h>
14#include <dm.h>
15#include <dm/device-internal.h>
Simon Glass336d4612020-02-03 07:36:16 -070016#include <dm/device_compat.h>
Simon Glass61b29b82020-02-03 07:36:15 -070017#include <dm/devres.h>
Marek Vasute30a70c2015-06-23 15:54:19 +020018#include <dm/lists.h>
19#include <dm/root.h>
20#include <errno.h>
Ley Foon Tandb6a1582018-09-04 14:04:58 +080021#include <reset.h>
Simon Glasscd93d622020-05-10 11:40:13 -060022#include <linux/bitops.h>
Marek Vasute30a70c2015-06-23 15:54:19 +020023
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000024#define GPIO_SWPORT_DR(p) (0x00 + (p) * 0xc)
25#define GPIO_SWPORT_DDR(p) (0x04 + (p) * 0xc)
Marek Vasute30a70c2015-06-23 15:54:19 +020026#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
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000033#define GPIO_EXT_PORT(p) (0x50 + (p) * 4)
Marek Vasute30a70c2015-06-23 15:54:19 +020034
Ley Foon Tandb6a1582018-09-04 14:04:58 +080035struct gpio_dwapb_priv {
36 struct reset_ctl_bulk resets;
37};
38
Marek Vasute30a70c2015-06-23 15:54:19 +020039struct gpio_dwapb_platdata {
40 const char *name;
41 int bank;
42 int pins;
43 fdt_addr_t base;
44};
45
46static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
47{
48 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
49
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000050 clrbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
Marek Vasute30a70c2015-06-23 15:54:19 +020051 return 0;
52}
53
54static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
55 int val)
56{
57 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
58
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000059 setbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin);
Marek Vasute30a70c2015-06-23 15:54:19 +020060
61 if (val)
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000062 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
Marek Vasute30a70c2015-06-23 15:54:19 +020063 else
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000064 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
Marek Vasute30a70c2015-06-23 15:54:19 +020065
66 return 0;
67}
68
69static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
70{
71 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000072 return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
Marek Vasute30a70c2015-06-23 15:54:19 +020073}
74
75
76static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
77{
78 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
79
80 if (val)
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000081 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
Marek Vasute30a70c2015-06-23 15:54:19 +020082 else
Phil Edworthy2d0c2c42016-11-03 11:05:12 +000083 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin);
Marek Vasute30a70c2015-06-23 15:54:19 +020084
85 return 0;
86}
87
Ley Foon Tan71f27002018-08-16 13:46:30 +080088static int dwapb_gpio_get_function(struct udevice *dev, unsigned offset)
89{
90 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
91 u32 gpio;
92
93 gpio = readl(plat->base + GPIO_SWPORT_DDR(plat->bank));
94
95 if (gpio & BIT(offset))
96 return GPIOF_OUTPUT;
97 else
98 return GPIOF_INPUT;
99}
100
Marek Vasute30a70c2015-06-23 15:54:19 +0200101static 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,
Ley Foon Tan71f27002018-08-16 13:46:30 +0800106 .get_function = dwapb_gpio_get_function,
Marek Vasute30a70c2015-06-23 15:54:19 +0200107};
108
Ley Foon Tandb6a1582018-09-04 14:04:58 +0800109static int gpio_dwapb_reset(struct udevice *dev)
110{
111 int ret;
112 struct gpio_dwapb_priv *priv = dev_get_priv(dev);
113
114 ret = reset_get_bulk(dev, &priv->resets);
115 if (ret) {
116 /* Return 0 if error due to !CONFIG_DM_RESET and reset
117 * DT property is not present.
118 */
119 if (ret == -ENOENT || ret == -ENOTSUPP)
120 return 0;
121
122 dev_warn(dev, "Can't get reset: %d\n", ret);
123 return ret;
124 }
125
126 ret = reset_deassert_bulk(&priv->resets);
127 if (ret) {
128 reset_release_bulk(&priv->resets);
129 dev_err(dev, "Failed to reset: %d\n", ret);
130 return ret;
131 }
132
133 return 0;
134}
135
Marek Vasute30a70c2015-06-23 15:54:19 +0200136static int gpio_dwapb_probe(struct udevice *dev)
137{
138 struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
139 struct gpio_dwapb_platdata *plat = dev->platdata;
140
Ley Foon Tandb6a1582018-09-04 14:04:58 +0800141 if (!plat) {
142 /* Reset on parent device only */
143 return gpio_dwapb_reset(dev);
144 }
Marek Vasute30a70c2015-06-23 15:54:19 +0200145
146 priv->gpio_count = plat->pins;
147 priv->bank_name = plat->name;
148
149 return 0;
150}
151
152static int gpio_dwapb_bind(struct udevice *dev)
153{
154 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
Marek Vasute30a70c2015-06-23 15:54:19 +0200155 struct udevice *subdev;
156 fdt_addr_t base;
Simon Goldschmidt1b898ff2019-05-09 22:12:00 +0200157 int ret, bank = 0;
158 ofnode node;
Marek Vasute30a70c2015-06-23 15:54:19 +0200159
160 /* If this is a child device, there is nothing to do here */
161 if (plat)
162 return 0;
163
Ley Foon Tan9ea35442018-08-16 02:05:54 +0800164 base = dev_read_addr(dev);
Marek Vasute30a70c2015-06-23 15:54:19 +0200165 if (base == FDT_ADDR_T_NONE) {
166 debug("Can't get the GPIO register base address\n");
167 return -ENXIO;
168 }
169
Simon Goldschmidt1b898ff2019-05-09 22:12:00 +0200170 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"))
Marek Vasute30a70c2015-06-23 15:54:19 +0200173 continue;
174
Ley Foon Tan86d56a52018-09-19 16:26:33 +0800175 plat = devm_kcalloc(dev, 1, sizeof(*plat), GFP_KERNEL);
Marek Vasute30a70c2015-06-23 15:54:19 +0200176 if (!plat)
177 return -ENOMEM;
178
179 plat->base = base;
180 plat->bank = bank;
Simon Goldschmidt1b898ff2019-05-09 22:12:00 +0200181 plat->pins = ofnode_read_u32_default(node, "snps,nr-gpios", 0);
182
183 if (ofnode_read_string_index(node, "bank-name", 0,
184 &plat->name)) {
Simon Goldschmidt89f1fe52018-11-02 11:54:50 +0100185 /*
186 * Fall back to node name. This means accessing pins
187 * via bank name won't work.
188 */
Simon Goldschmidt1b898ff2019-05-09 22:12:00 +0200189 plat->name = ofnode_get_name(node);
Simon Goldschmidt89f1fe52018-11-02 11:54:50 +0100190 }
Marek Vasute30a70c2015-06-23 15:54:19 +0200191
Simon Goldschmidt34b1a512019-05-21 22:03:12 +0200192 ret = device_bind_ofnode(dev, dev->driver, plat->name,
193 plat, node, &subdev);
Marek Vasute30a70c2015-06-23 15:54:19 +0200194 if (ret)
Ley Foon Tan86d56a52018-09-19 16:26:33 +0800195 return ret;
Marek Vasute30a70c2015-06-23 15:54:19 +0200196
Marek Vasute30a70c2015-06-23 15:54:19 +0200197 bank++;
198 }
199
200 return 0;
Marek Vasute30a70c2015-06-23 15:54:19 +0200201}
202
Ley Foon Tandb6a1582018-09-04 14:04:58 +0800203static 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
Marek Vasute30a70c2015-06-23 15:54:19 +0200214static const struct udevice_id gpio_dwapb_ids[] = {
215 { .compatible = "snps,dw-apb-gpio" },
216 { }
217};
218
219U_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,
Ley Foon Tandb6a1582018-09-04 14:04:58 +0800226 .remove = gpio_dwapb_remove,
227 .priv_auto_alloc_size = sizeof(struct gpio_dwapb_priv),
Marek Vasute30a70c2015-06-23 15:54:19 +0200228};