1 // SPDX-License-Identifier: BSD-3-Clause
2 //
3 // Copyright(c) 2019 Intel Corporation. All rights reserved.
4 //
5 // Author: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
6
7 #include <sof/drivers/gpio.h>
8 #include <sof/drivers/iomux.h>
9 #include <sof/lib/io.h>
10 #include <sof/lib/memory.h>
11 #include <errno.h>
12 #include <stddef.h>
13 #include <stdint.h>
14
15 #define PORTA_DAT_REG 0x00
16 #define PORTA_DIR_REG 0x04
17 #define PORTA_CTL_REG 0x08
18
19 struct gpio {
20 uint32_t base;
21 };
22
23 static struct gpio dw_gpio = {
24 .base = DW_GPIO_BASE,
25 };
26
gpio_write(const struct gpio * gpio,unsigned int port,enum gpio_level level)27 int gpio_write(const struct gpio *gpio, unsigned int port,
28 enum gpio_level level)
29 {
30 io_reg_update_bits(gpio->base + PORTA_DAT_REG, 1 << port,
31 (level == GPIO_LEVEL_HIGH) << port);
32
33 return 0;
34 }
35
gpio_read(const struct gpio * gpio,unsigned int port)36 int gpio_read(const struct gpio *gpio, unsigned int port)
37 {
38 return ((io_reg_read(gpio->base + PORTA_DAT_REG) >> port) & 1) ?
39 GPIO_LEVEL_HIGH : GPIO_LEVEL_LOW;
40 }
41
gpio_configure(const struct gpio * gpio,unsigned int port,const struct gpio_config * config)42 int gpio_configure(const struct gpio *gpio, unsigned int port,
43 const struct gpio_config *config)
44 {
45 const struct gpio_pin_config *gpio_cfg = gpio_data + port;
46 const struct iomux_pin_config *pin_cfg = &gpio_cfg->mux_config;
47 struct iomux *mux = iomux_get(gpio_cfg->mux_id);
48 int ret;
49
50 if (!mux)
51 return -ENODEV;
52
53 ret = iomux_configure(mux, pin_cfg);
54 if (ret < 0)
55 return ret;
56
57 /* set the direction of GPIO */
58 io_reg_update_bits(gpio->base + PORTA_DIR_REG, 1 << port,
59 (config->direction == GPIO_DIRECTION_OUTPUT) << port);
60
61 return 0;
62 }
63
gpio_get(unsigned int id)64 const struct gpio *gpio_get(unsigned int id)
65 {
66 return id ? NULL : &dw_gpio;
67 }
68
gpio_probe(const struct gpio * gpio)69 int gpio_probe(const struct gpio *gpio)
70 {
71 return gpio == &dw_gpio ? 0 : -ENODEV;
72 }
73
