1
2
3
4
5
6
7#include <common.h>
8#include <dm.h>
9#include <malloc.h>
10#include <errno.h>
11#include <fdtdec.h>
12#include <asm/io.h>
13#include <asm/bitops.h>
14#include <asm/gpio.h>
15#include <dm/device-internal.h>
16#include <dt-bindings/gpio/gpio.h>
17#include "tegra186_gpio_priv.h"
18
19struct tegra186_gpio_port_data {
20 const char *name;
21 uint32_t offset;
22};
23
24struct tegra186_gpio_ctlr_data {
25 const struct tegra186_gpio_port_data *ports;
26 uint32_t port_count;
27};
28
29struct tegra186_gpio_platdata {
30 const char *name;
31 uint32_t *regs;
32};
33
34static uint32_t *tegra186_gpio_reg(struct udevice *dev, uint32_t reg,
35 uint32_t gpio)
36{
37 struct tegra186_gpio_platdata *plat = dev->platdata;
38 uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;
39
40 return &(plat->regs[index]);
41}
42
43static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
44 bool output)
45{
46 uint32_t *reg;
47 uint32_t rval;
48
49 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
50 rval = readl(reg);
51 if (output)
52 rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
53 else
54 rval |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
55 writel(rval, reg);
56
57 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
58 rval = readl(reg);
59 if (output)
60 rval |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
61 else
62 rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
63 rval |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
64 writel(rval, reg);
65
66 return 0;
67}
68
69static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
70{
71 uint32_t *reg;
72 uint32_t rval;
73
74 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
75 rval = readl(reg);
76 if (val)
77 rval |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
78 else
79 rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
80 writel(rval, reg);
81
82 return 0;
83}
84
85static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
86{
87 return tegra186_gpio_set_out(dev, offset, false);
88}
89
90static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
91 int value)
92{
93 int ret;
94
95 ret = tegra186_gpio_set_val(dev, offset, value != 0);
96 if (ret)
97 return ret;
98 return tegra186_gpio_set_out(dev, offset, true);
99}
100
101static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
102{
103 uint32_t *reg;
104 uint32_t rval;
105
106 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
107 rval = readl(reg);
108
109 if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
110 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
111 offset);
112 else
113 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);
114
115 rval = readl(reg);
116 return !!rval;
117}
118
119static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
120 int value)
121{
122 return tegra186_gpio_set_val(dev, offset, value != 0);
123}
124
125static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
126{
127 uint32_t *reg;
128 uint32_t rval;
129
130 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
131 rval = readl(reg);
132 if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
133 return GPIOF_OUTPUT;
134 else
135 return GPIOF_INPUT;
136}
137
138static int tegra186_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
139 struct ofnode_phandle_args *args)
140{
141 int gpio, port, ret;
142
143 gpio = args->args[0];
144 port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
145 ret = device_get_child(dev, port, &desc->dev);
146 if (ret)
147 return ret;
148 desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
149 desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
150
151 return 0;
152}
153
154static const struct dm_gpio_ops tegra186_gpio_ops = {
155 .direction_input = tegra186_gpio_direction_input,
156 .direction_output = tegra186_gpio_direction_output,
157 .get_value = tegra186_gpio_get_value,
158 .set_value = tegra186_gpio_set_value,
159 .get_function = tegra186_gpio_get_function,
160 .xlate = tegra186_gpio_xlate,
161};
162
163
164
165
166
167static int tegra186_gpio_bind(struct udevice *parent)
168{
169 struct tegra186_gpio_platdata *parent_plat = parent->platdata;
170 struct tegra186_gpio_ctlr_data *ctlr_data =
171 (struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
172 uint32_t *regs;
173 int port, ret;
174
175
176 if (parent_plat)
177 return 0;
178
179 regs = (uint32_t *)devfdt_get_addr_name(parent, "gpio");
180 if (regs == (uint32_t *)FDT_ADDR_T_NONE)
181 return -EINVAL;
182
183 for (port = 0; port < ctlr_data->port_count; port++) {
184 struct tegra186_gpio_platdata *plat;
185 struct udevice *dev;
186
187 plat = calloc(1, sizeof(*plat));
188 if (!plat)
189 return -ENOMEM;
190 plat->name = ctlr_data->ports[port].name;
191 plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);
192
193 ret = device_bind(parent, parent->driver, plat->name, plat,
194 -1, &dev);
195 if (ret)
196 return ret;
197 dev_set_of_offset(dev, dev_of_offset(parent));
198 }
199
200 return 0;
201}
202
203static int tegra186_gpio_probe(struct udevice *dev)
204{
205 struct tegra186_gpio_platdata *plat = dev->platdata;
206 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
207
208
209 if (!plat)
210 return 0;
211
212 uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
213 uc_priv->bank_name = plat->name;
214
215 return 0;
216}
217
218static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
219 {"A", 0x2000},
220 {"B", 0x3000},
221 {"C", 0x3200},
222 {"D", 0x3400},
223 {"E", 0x2200},
224 {"F", 0x2400},
225 {"G", 0x4200},
226 {"H", 0x1000},
227 {"I", 0x0800},
228 {"J", 0x5000},
229 {"K", 0x5200},
230 {"L", 0x1200},
231 {"M", 0x5600},
232 {"N", 0x0000},
233 {"O", 0x0200},
234 {"P", 0x4000},
235 {"Q", 0x0400},
236 {"R", 0x0a00},
237 {"T", 0x0600},
238 {"X", 0x1400},
239 {"Y", 0x1600},
240 {"BB", 0x2600},
241 {"CC", 0x5400},
242};
243
244static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
245 .ports = tegra186_gpio_main_ports,
246 .port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
247};
248
249static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
250 {"S", 0x0200},
251 {"U", 0x0400},
252 {"V", 0x0800},
253 {"W", 0x0a00},
254 {"Z", 0x0e00},
255 {"AA", 0x0c00},
256 {"EE", 0x0600},
257 {"FF", 0x0000},
258};
259
260static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
261 .ports = tegra186_gpio_aon_ports,
262 .port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
263};
264
265static const struct udevice_id tegra186_gpio_ids[] = {
266 {
267 .compatible = "nvidia,tegra186-gpio",
268 .data = (ulong)&tegra186_gpio_main_data,
269 },
270 {
271 .compatible = "nvidia,tegra186-gpio-aon",
272 .data = (ulong)&tegra186_gpio_aon_data,
273 },
274 { }
275};
276
277U_BOOT_DRIVER(tegra186_gpio) = {
278 .name = "tegra186_gpio",
279 .id = UCLASS_GPIO,
280 .of_match = tegra186_gpio_ids,
281 .bind = tegra186_gpio_bind,
282 .probe = tegra186_gpio_probe,
283 .ops = &tegra186_gpio_ops,
284};
285
