1 /*
2 * Copyright (c) 2023 Tokita, Hiroshi <tokita.hiroshi@fujitsu.com>
3 * Copyright (c) 2023 Yonatan Schachter
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
8 #include <zephyr/device.h>
9 #include <zephyr/drivers/clock_control.h>
10 #include <zephyr/drivers/misc/pio_rpi_pico/pio_rpi_pico.h>
11 #include <zephyr/drivers/pinctrl.h>
12 #include <zephyr/drivers/reset.h>
13
14 #define DT_DRV_COMPAT raspberrypi_pico_pio
15
16 struct pio_rpi_pico_config {
17 PIO pio;
18 const struct device *clk_dev;
19 clock_control_subsys_t clk_id;
20 const struct reset_dt_spec reset;
21 };
22
pio_rpi_pico_allocate_sm(const struct device * dev,size_t * sm)23 int pio_rpi_pico_allocate_sm(const struct device *dev, size_t *sm)
24 {
25 const struct pio_rpi_pico_config *config = dev->config;
26 int retval;
27
28 retval = pio_claim_unused_sm(config->pio, false);
29 if (retval < 0) {
30 return -EBUSY;
31 }
32
33 *sm = (size_t)retval;
34 return 0;
35 }
36
pio_rpi_pico_get_pio(const struct device * dev)37 PIO pio_rpi_pico_get_pio(const struct device *dev)
38 {
39 const struct pio_rpi_pico_config *config = dev->config;
40
41 return config->pio;
42 }
43
pio_rpi_pico_init(const struct device * dev)44 static int pio_rpi_pico_init(const struct device *dev)
45 {
46 const struct pio_rpi_pico_config *config = dev->config;
47 int ret;
48
49 ret = clock_control_on(config->clk_dev, config->clk_id);
50 if (ret < 0) {
51 return ret;
52 }
53
54 ret = reset_line_toggle_dt(&config->reset);
55 if (ret < 0) {
56 return ret;
57 }
58
59 return 0;
60 }
61
62 #define RPI_PICO_PIO_INIT(idx) \
63 static const struct pio_rpi_pico_config pio_rpi_pico_config_##idx = { \
64 .pio = (PIO)DT_INST_REG_ADDR(idx), \
65 .clk_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(idx)), \
66 .clk_id = (clock_control_subsys_t)DT_INST_PHA_BY_IDX(0, clocks, 0, clk_id), \
67 .reset = RESET_DT_SPEC_INST_GET(idx), \
68 }; \
69 \
70 DEVICE_DT_INST_DEFINE(idx, &pio_rpi_pico_init, NULL, NULL, &pio_rpi_pico_config_##idx, \
71 PRE_KERNEL_2, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, NULL);
72
73 DT_INST_FOREACH_STATUS_OKAY(RPI_PICO_PIO_INIT)
74
