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git.ipfire.org Git - thirdparty/u-boot.git/blob - drivers/gpio/tegra_gpio.c
2 * NVIDIA Tegra20 GPIO handling.
3 * (C) Copyright 2010-2012
4 * NVIDIA Corporation <www.nvidia.com>
6 * SPDX-License-Identifier: GPL-2.0+
10 * Based on (mostly copied from) kw_gpio.c based Linux 2.6 kernel driver.
11 * Tom Warren (twarren@nvidia.com)
16 #include <asm/bitops.h>
17 #include <asm/arch/tegra.h>
27 static struct gpio_names
{
28 char name
[GPIO_NAME_SIZE
];
29 } gpio_names
[MAX_NUM_GPIOS
];
31 static char *get_name(int i
)
33 return *gpio_names
[i
].name
? gpio_names
[i
].name
: "UNKNOWN";
36 /* Return config of pin 'gpio' as GPIO (1) or SFPIO (0) */
37 static int get_config(unsigned gpio
)
39 struct gpio_ctlr
*ctlr
= (struct gpio_ctlr
*)NV_PA_GPIO_BASE
;
40 struct gpio_ctlr_bank
*bank
= &ctlr
->gpio_bank
[GPIO_BANK(gpio
)];
44 u
= readl(&bank
->gpio_config
[GPIO_PORT(gpio
)]);
45 type
= (u
>> GPIO_BIT(gpio
)) & 1;
47 debug("get_config: port = %d, bit = %d is %s\n",
48 GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
), type
? "GPIO" : "SFPIO");
53 /* Config pin 'gpio' as GPIO or SFPIO, based on 'type' */
54 static void set_config(unsigned gpio
, int type
)
56 struct gpio_ctlr
*ctlr
= (struct gpio_ctlr
*)NV_PA_GPIO_BASE
;
57 struct gpio_ctlr_bank
*bank
= &ctlr
->gpio_bank
[GPIO_BANK(gpio
)];
60 debug("set_config: port = %d, bit = %d, %s\n",
61 GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
), type
? "GPIO" : "SFPIO");
63 u
= readl(&bank
->gpio_config
[GPIO_PORT(gpio
)]);
65 u
|= 1 << GPIO_BIT(gpio
);
67 u
&= ~(1 << GPIO_BIT(gpio
));
68 writel(u
, &bank
->gpio_config
[GPIO_PORT(gpio
)]);
71 /* Return GPIO pin 'gpio' direction - 0 = input or 1 = output */
72 static int get_direction(unsigned gpio
)
74 struct gpio_ctlr
*ctlr
= (struct gpio_ctlr
*)NV_PA_GPIO_BASE
;
75 struct gpio_ctlr_bank
*bank
= &ctlr
->gpio_bank
[GPIO_BANK(gpio
)];
79 u
= readl(&bank
->gpio_dir_out
[GPIO_PORT(gpio
)]);
80 dir
= (u
>> GPIO_BIT(gpio
)) & 1;
82 debug("get_direction: port = %d, bit = %d, %s\n",
83 GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
), dir
? "OUT" : "IN");
88 /* Config GPIO pin 'gpio' as input or output (OE) as per 'output' */
89 static void set_direction(unsigned gpio
, int output
)
91 struct gpio_ctlr
*ctlr
= (struct gpio_ctlr
*)NV_PA_GPIO_BASE
;
92 struct gpio_ctlr_bank
*bank
= &ctlr
->gpio_bank
[GPIO_BANK(gpio
)];
95 debug("set_direction: port = %d, bit = %d, %s\n",
96 GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
), output
? "OUT" : "IN");
98 u
= readl(&bank
->gpio_dir_out
[GPIO_PORT(gpio
)]);
100 u
|= 1 << GPIO_BIT(gpio
);
102 u
&= ~(1 << GPIO_BIT(gpio
));
103 writel(u
, &bank
->gpio_dir_out
[GPIO_PORT(gpio
)]);
106 /* set GPIO pin 'gpio' output bit as 0 or 1 as per 'high' */
107 static void set_level(unsigned gpio
, int high
)
109 struct gpio_ctlr
*ctlr
= (struct gpio_ctlr
*)NV_PA_GPIO_BASE
;
110 struct gpio_ctlr_bank
*bank
= &ctlr
->gpio_bank
[GPIO_BANK(gpio
)];
113 debug("set_level: port = %d, bit %d == %d\n",
114 GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
), high
);
116 u
= readl(&bank
->gpio_out
[GPIO_PORT(gpio
)]);
118 u
|= 1 << GPIO_BIT(gpio
);
120 u
&= ~(1 << GPIO_BIT(gpio
));
121 writel(u
, &bank
->gpio_out
[GPIO_PORT(gpio
)]);
125 * Generic_GPIO primitives.
128 int gpio_request(unsigned gpio
, const char *label
)
130 if (gpio
>= MAX_NUM_GPIOS
)
134 strncpy(gpio_names
[gpio
].name
, label
, GPIO_NAME_SIZE
);
135 gpio_names
[gpio
].name
[GPIO_NAME_SIZE
- 1] = '\0';
138 /* Configure as a GPIO */
144 int gpio_free(unsigned gpio
)
146 if (gpio
>= MAX_NUM_GPIOS
)
149 gpio_names
[gpio
].name
[0] = '\0';
150 /* Do not configure as input or change pin mux here */
154 /* read GPIO OUT value of pin 'gpio' */
155 static int gpio_get_output_value(unsigned gpio
)
157 struct gpio_ctlr
*ctlr
= (struct gpio_ctlr
*)NV_PA_GPIO_BASE
;
158 struct gpio_ctlr_bank
*bank
= &ctlr
->gpio_bank
[GPIO_BANK(gpio
)];
161 debug("gpio_get_output_value: pin = %d (port %d:bit %d)\n",
162 gpio
, GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
));
164 val
= readl(&bank
->gpio_out
[GPIO_PORT(gpio
)]);
166 return (val
>> GPIO_BIT(gpio
)) & 1;
169 /* set GPIO pin 'gpio' as an input */
170 int gpio_direction_input(unsigned gpio
)
172 debug("gpio_direction_input: pin = %d (port %d:bit %d)\n",
173 gpio
, GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
));
175 /* Configure GPIO direction as input. */
176 set_direction(gpio
, 0);
181 /* set GPIO pin 'gpio' as an output, with polarity 'value' */
182 int gpio_direction_output(unsigned gpio
, int value
)
184 debug("gpio_direction_output: pin = %d (port %d:bit %d) = %s\n",
185 gpio
, GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
),
186 value
? "HIGH" : "LOW");
188 /* Configure GPIO output value. */
189 set_level(gpio
, value
);
191 /* Configure GPIO direction as output. */
192 set_direction(gpio
, 1);
197 /* read GPIO IN value of pin 'gpio' */
198 int gpio_get_value(unsigned gpio
)
200 struct gpio_ctlr
*ctlr
= (struct gpio_ctlr
*)NV_PA_GPIO_BASE
;
201 struct gpio_ctlr_bank
*bank
= &ctlr
->gpio_bank
[GPIO_BANK(gpio
)];
204 debug("gpio_get_value: pin = %d (port %d:bit %d)\n",
205 gpio
, GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
));
207 val
= readl(&bank
->gpio_in
[GPIO_PORT(gpio
)]);
209 return (val
>> GPIO_BIT(gpio
)) & 1;
212 /* write GPIO OUT value to pin 'gpio' */
213 int gpio_set_value(unsigned gpio
, int value
)
215 debug("gpio_set_value: pin = %d (port %d:bit %d), value = %d\n",
216 gpio
, GPIO_FULLPORT(gpio
), GPIO_BIT(gpio
), value
);
218 /* Configure GPIO output value. */
219 set_level(gpio
, value
);
225 * Display Tegra GPIO information
232 for (c
= 0; c
< MAX_NUM_GPIOS
; c
++) {
233 type
= get_config(c
); /* GPIO, not SFPIO */
235 printf("GPIO_%d:\t%s is an %s, ", c
,
237 get_direction(c
) ? "OUTPUT" : "INPUT");
238 if (get_direction(c
))
239 printf("value = %d", gpio_get_output_value(c
));
241 printf("value = %d", gpio_get_value(c
));