Line data Source code
1 1 : /*
2 : * Copyright (c) 2023 Tokita, Hiroshi <tokita.hiroshi@fujitsu.com>
3 : * Copyright (c) 2023 Yonatan Schachter
4 : * Copyright (c) 2023 Ionut Pavel <iocapa@iocapa.com>
5 : *
6 : * SPDX-License-Identifier: Apache-2.0
7 : */
8 :
9 : /**
10 : * @file
11 : * @brief Header file for Raspberry Pi Pico PIO driver
12 : * @ingroup pio_rpi_pico_interface
13 : */
14 :
15 : #ifndef ZEPHYR_DRIVERS_MISC_PIO_PICO_RPI_PIO_PICO_RPI_H_
16 : #define ZEPHYR_DRIVERS_MISC_PIO_PICO_RPI_PIO_PICO_RPI_H_
17 :
18 : /**
19 : * @brief Interfaces for Raspberry Pi Pico Programmable I/O (PIO).
20 : * @defgroup pio_rpi_pico_interface Raspberry Pi Pico PIO
21 : * @ingroup misc_interfaces
22 : *
23 : * @{
24 : */
25 :
26 : #include <zephyr/devicetree/gpio.h>
27 :
28 : #include <hardware/pio.h>
29 :
30 : /**
31 : * @brief Utility macro to define a PIO program. The program is a list
32 : * of 16 bit instructions, generated by the pioasm tool.
33 : *
34 : * @param name Name of the program.
35 : * @param wrap_target Wrap target as specified by the PIO program.
36 : * @param wrap Wrap source as specified by the PIO program.
37 : * @param ... Comma separated list of PIO instructions.
38 : */
39 1 : #define RPI_PICO_PIO_DEFINE_PROGRAM(name, wrap_target, wrap, ...) \
40 : static const uint32_t name ## _wrap_target = wrap_target; \
41 : static const uint32_t name ## _wrap = wrap; \
42 : static const uint16_t name ## _program_instructions[] = { \
43 : __VA_ARGS__ \
44 : }; \
45 : static const struct pio_program name ## _program = { \
46 : .instructions = name ## _program_instructions, \
47 : .length = ARRAY_SIZE(name ## _program_instructions), \
48 : .origin = -1, \
49 : }
50 :
51 : /**
52 : * @brief Utility macro to get the wrap target of a program.
53 : *
54 : * @param name Name of the program.
55 : */
56 1 : #define RPI_PICO_PIO_GET_WRAP_TARGET(name) name ## _wrap_target
57 :
58 : /**
59 : * @brief Utility macro to get the wrap source of a program.
60 : *
61 : * @param name Name of the program.
62 : */
63 1 : #define RPI_PICO_PIO_GET_WRAP(name) name ## _wrap
64 :
65 : /**
66 : * @brief Utility macro to get a pointer to a PIO program.
67 : *
68 : * @param name Name of the program.
69 : */
70 1 : #define RPI_PICO_PIO_GET_PROGRAM(name) &name ## _program
71 :
72 : /**
73 : * @brief Get a pin number from a pinctrl / group name and index
74 : *
75 : * Example devicetree fragment(s):
76 : *
77 : * @code{.dts}
78 : * pinctrl {
79 : * pio_child_default: pio_child_default {
80 : * tx_gpio {
81 : * pinmux = <PIO0_P0>, <PIO0_P2>;
82 : * };
83 : *
84 : * rx_gpio {
85 : * pinmux = <PIO0_P1>;
86 : * input-enable;
87 : * };
88 : * };
89 : * };
90 : * @endcode
91 : *
92 : * @code{.dts}
93 : * pio {
94 : * status = "okay";
95 : * c: child {
96 : * pinctrl-0 = <&pio_child_default>;
97 : * pinctrl-names = "default";
98 : * };
99 : * };
100 : * @endcode
101 : *
102 : * Example usage:
103 : *
104 : * @code{.c}
105 : * DT_RPI_PICO_PIO_PIN_BY_NAME(node, default, 0, tx_gpio, 0) // 0
106 : * DT_RPI_PICO_PIO_PIN_BY_NAME(node, default, 0, tx_gpio, 1) // 2
107 : * DT_RPI_PICO_PIO_PIN_BY_NAME(node, default, 0, rx_gpio, 0) // 1
108 : * @endcode
109 : *
110 : * @param node_id node identifier
111 : * @param p_name pinctrl name
112 : * @param p_idx pinctrl index
113 : * @param g_name group name
114 : * @param g_idx group index
115 : * @return pin number
116 : */
117 1 : #define DT_RPI_PICO_PIO_PIN_BY_NAME(node_id, p_name, p_idx, g_name, g_idx) \
118 : RP2_GET_PIN_NUM(DT_PROP_BY_IDX( \
119 : DT_CHILD(DT_PINCTRL_BY_NAME(node_id, p_name, p_idx), g_name), pinmux, g_idx))
120 :
121 : /**
122 : * @brief Get a pin number from a pinctrl / group name and index
123 : *
124 : * @param inst instance number
125 : * @param p_name pinctrl name
126 : * @param p_idx pinctrl index
127 : * @param g_name group name
128 : * @param g_idx group index
129 : * @return pin number
130 : *
131 : * @see DT_RPI_PICO_PIO_PIN_BY_NAME
132 : */
133 1 : #define DT_INST_RPI_PICO_PIO_PIN_BY_NAME(inst, p_name, p_idx, g_name, g_idx) \
134 : DT_RPI_PICO_PIO_PIN_BY_NAME(DT_DRV_INST(inst), p_name, p_idx, g_name, g_idx)
135 :
136 : /**
137 : * @brief Get the pin number of a pin by its name.
138 : *
139 : * @param inst instance number
140 : * @param name name of the pin (e.g. tx, rx, sck).
141 : */
142 1 : #define DT_INST_PIO_PIN_BY_NAME(inst, name) \
143 : DT_PIO_PIN_BY_NAME(DT_DRV_INST(inst), name)
144 :
145 : /**
146 : * Get PIO object
147 : *
148 : * @param dev Pointer to device structure for rpi_pio device instance
149 : * @return PIO object
150 : */
151 1 : inline PIO pio_rpi_pico_get_pio(const struct device *dev)
152 : {
153 : return *(PIO *)(dev->config);
154 : }
155 :
156 : /**
157 : * Allocate a state machine.
158 : *
159 : * @param dev Pointer to device structure for rpi_pio device instance
160 : * @param sm Pointer to store allocated state machine
161 : * @retval 0 on success
162 : * @retval -EBUSY if no state machines were available
163 : */
164 1 : int pio_rpi_pico_allocate_sm(const struct device *dev, size_t *sm);
165 :
166 : /**
167 : * @}
168 : */
169 :
170 : #endif /* ZEPHYR_DRIVERS_MISC_PIO_PICO_RPI_PIO_PICO_RPI_H_ */
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